CN103428731B - Routing optimization method and system, gateway - Google Patents

Abstract

The invention discloses a route optimization method, comprising: a service gateway executes route optimization judgment according to acquired route optimization judgment information, and executes establishment of a route optimization channel when it is judged that route optimization can be performed. The invention discloses a service gateway and a routing optimization system. The technical scheme of the invention can reduce the time delay of data transmission and reduce the network burden of the core network.

Description

Route optimization method and system, service gateway

technical field

The invention relates to route optimization technology, in particular to a route optimization method and system, and a service gateway.

Background technique

In order to maintain the competitiveness of the third-generation mobile communication system in the communication field, provide users with faster rate, lower delay, and more personalized mobile communication services, and at the same time, in order to reduce the operating costs of operators, the third-generation cooperation The standard working group of the Partnership Project (3GPP, 3rd Generation Partnership Project) is working on the research of the Evolved Packet System (EPS, Evolved Packet System). Fig. 1 is a schematic structural diagram of an evolved packet domain system. As shown in Fig. 1, the entire EPS system is divided into two parts: a radio access network and a core network. The core network includes Home Subscriber Server (HSS, HomeSubscriber Server), Mobility Management Entity (MME, Mobility Management Entity), Serving GPRS Support Node (SGSN, Serving GPRS Support Node), Policy and Charging Rule Function (PCRF, Policy and Charging Rule Function ), a serving gateway (S-GW, Serving Gateway), a packet data gateway (P-GW, PDNGateway) and a packet data network (PDN, Packet Data Network). The related functions of each network element are described in detail below.

The home user server is the permanent storage place of the user subscription data, and is located in the home network of the user subscription.

The mobility management entity is the storage location of user subscription data in the current network, responsible for terminal-to-network non-access layer signaling management, terminal security verification function, terminal mobility management, user tracking and paging in idle mode Administrative functions and bearer management.

Serving GPRS support node, is the Global System for Mobile Communications (GSM, Global System for Mobile Communications) Enhanced Data Rate GSM Evolution (EDGE, Enhanced Data Rate for GSM Evolution) Radio Access Network (GERAN, GSM EDGE Radio Access Network) and Universal Mobile Communications System (UMTS, Universal Mobile Telecommunications System) terrestrial radio access network (UTRAN, UMTSTerrestrial Radio Access Network) service support point for users to access the core network. Functionally similar to the mobility management entity, it is responsible for user location update and paging management and bearer management functions.

The service gateway is the gateway from the core network to the wireless system, responsible for the user plane bearer from the terminal to the core network, data caching in the terminal idle mode, the function of initiating service requests on the network side, legal interception, and packet data routing and forwarding functions; the service gateway Responsible for making statistics on the use of wireless networks by user terminals, and generating bills of wireless network use by terminals, and sending them to the billing gateway.

The packet data gateway is the gateway of the evolution system and the system's external packet data network, which is connected to the Internet and the packet data network, and is responsible for the Internet Protocol (IP, Internet Protocol) address allocation, billing function, packet filtering, and Policy control and other functions.

The packet data network is the operator's IP service network, which provides IP services to users through the operator's core network.

The policy charging rule functional entity is a server responsible for providing charging control, online credit control, threshold control, and quality of service (QoS, Quality of Service) policy rules in the evolved system.

The radio access network is composed of an evolved base station (eNB, Evolved NodeB) and a 3G radio network controller (RNC, Radio Network Controller). resources, resource scheduling, and access control.

The above serving GPRS support node is an upgraded SGSN, which can support the S4 interface with the serving gateway, and communicate with the mobility management unit using GPRS Tunneling Protocol version 2 (GTPv2, GPRS Tunneling Protocol version 2). However, for the SGSN supporting the 3G core network, the packet switching (PS, Packet Switching) domain network architecture is different from that shown in FIG. 1 . At this time, the SGSN and the MME are connected through the Gn interface, and the intercommunication adopts the GPRS Tunneling Protocol version 1 (GTPv1, GPRS Tunneling Protocol version 1). The SGSN cannot be connected with the service gateway, and is connected to the gateway GPRS support node (GGSN, Gateway GPRS Support Node) through the Gn interface to directly access the packet data network.

When a user accesses a service, the terminal will initiate a packet data network (PDN, Packet Data Network) connection establishment process. The MME/SGSN selects the core network service gateway and the anchor gateway according to the APN reported by the terminal corresponding to the service used by the user, and establishes a slave terminal - A user plane channel between a wireless base station and a core network gateway (serving gateway and anchor gateway). Users access external/internal network services through the anchor gateway. When the user moves within the service area of the anchor gateway, the service will not be interrupted. Figure 2 is a schematic diagram of the user plane path for the user terminal to receive/send data. As shown in Figure 2, path 1 indicates that the user accesses the external Internet network, and path 2 indicates that the user communicates with users belonging to the same service gateway service area.

It can be seen from Figure 2 that the data received/sent by the user terminal will pass through the anchor gateway of the core network, even if the two users communicating with each other are located under the same service gateway. This data transmission mode is not optimized enough, which increases the delay of user data transmission and reduces the resource utilization rate of the core network. Especially after the popularization and development of device-to-device (D2D, Device to Device) services, the bottleneck in routing will become more prominent.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a route optimization method and system, and a service gateway, which can realize route optimization according to the access status of both communicating parties.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A routing optimization method, comprising:

The service gateway executes the route optimization judgment according to the obtained route optimization judgment information, and executes the establishment of the route optimization channel when it is judged that the route optimization can be performed.

Wherein, the route optimization decision information includes route optimization subscription information and/or route optimization strategy, and information for determining the positional relationship between the communication parties.

Wherein, the determination that route optimization can be performed is:

The routing optimization contract information and/or routing optimization strategies of the communication parties both allow route optimization, and the communication parties are located in the same service gateway service area, and it is determined that the communication parties can perform route optimization.

Wherein, the acquisition of route-optimized subscription information and/or route-optimized strategy information is:

The mobility management unit sends the route-optimized subscription information and/or route-optimized policy information received from the subscription data server to the serving gateway when creating a session or modifying an existing bearer;

Alternatively, the configuration network element in the network configures the communication party's route optimization subscription information and/or route optimization policy information as configuration information into the service gateway.

Or, during the creation or modification of the IP-CAN, IP-Connectivity Access Network (IP-CAN, IP-Connectivity Access Network) session initiated by the anchor gateway with the Policy and Charging Rules Function entity (PCRF, Policy and ChargingRules Function), obtain from the PCRF The communication party's route-optimized subscription information and/or route-optimized policy information are forwarded to the service gateway.

Or, when the PCRF actively initiates bearer establishment or bearer modification, it sends the communication party's route-optimized subscription information and/or route-optimized policy information to the anchor point gateway, and the anchor point gateway sends the route-optimized contract information and/or Or route optimization policy information is sent to the service gateway.

Wherein, the acquisition of the information used to determine the positional relationship between the communication parties is:

During the creation or modification of the IP-CAN session initiated by the anchor point gateway with the PCRF, the PCRF specifies the IP-CAN session or the transmission flow template TFT used by the bearer during the establishment or modification of the IP-CAN session to the serving gateway; The service gateway acquires the IP address of the attached communication party from the TFT;

Or, when the PCRF initiates bearer establishment or bearer modification, it will notify the anchor point gateway of the TFT used by the IP-CAN session or bearer specified in the IP-CAN session creation or modification process, and the anchor point gateway will forward the TFT To the service gateway; the service gateway obtains the IP address of the attached communication party from the TFT;

Or, the service gateway parses out the IP address of the attached communicating party from the header of the received data packet;

Alternatively, the anchor point gateway obtains the IP address of the attached communicating party through the process of assigning an IP address or monitoring the process of a DHCP message, and then notifies the serving gateway.

Wherein, the acquisition of the information used to determine the positional relationship between the communication parties is:

Configuring the network element to send the base station topology information capable of serving the serving gateway to the serving gateway;

Alternatively, the service gateway initiates a DNS query request to the DNS server of the communication parties, and the DNS server queries the location relationship between the base stations serving the communication parties according to the saved wireless network topology, and notifies the service gateway.

Wherein, the communication parties share one serving gateway, one anchor gateway or different anchor gateways.

Wherein, the establishment of the execution routing optimization channel is:

Both communication parties establish a routing channel through the service gateway without going through the core network;

Alternatively, the two communicating parties establish a routing channel through the wireless side network element instead of the core network.

Wherein, the method also includes:

When the service gateway determines that the communication parties establish a routing channel through the wireless side network element without passing through the core network, the obtained TFT, the formulated routing optimization strategy, and the wireless side network element address to which the communicating party belongs are sent through the mobility management unit The network element on the wireless side attached to the communicating party;

Establish routing optimization channels between the wireless side network elements attached to each other by the communication parties through the peer address;

When the wireless side network element receives the data sent by the non-core network, it matches the data to the corresponding radio bearer according to the TFT or matches the data to the dedicated bearer of both communication parties, and when receiving the data sent by the communication party, Determine whether to route through the core network or route through the route optimization channel according to the routing policy.

Wherein, the method also includes:

When the service gateway determines that the communication parties establish a routing channel through the service gateway without passing through the core network, the data requiring route optimization is matched to the corresponding S1-U or S12 bearer through TFT or to the dedicated bearer determined by the PCRF for both communication parties In the above, the non-locally routed data is sent to the core network bearer and routed through the core network, and the data requiring route optimization is encapsulated on the corresponding S1-U or S12 bearer and sent to the wireless side network element attached to the communication party, and then sent to the correspondent.

Wherein, the method also includes:

PCRF establishes a dedicated bearer for both communication parties or designates a certain bearer for the transmission of route optimization data of both communication parties;

When the service gateway determines that the communication parties establish a routing channel through the wireless side network element without passing through the core network, it sends the bearer type, routing optimization strategy, bearer label, and the address of the wireless side network element to which the communicating party belongs to the communication party through the mobility management unit. The network element on the wireless side attached to one side;

The network element on the wireless side establishes a matching routing optimization channel for each bearer according to the bearer label; the data on the bearer dedicated to routing optimization is determined according to the routing policy, and if the data is suitable for routing optimization, it is transmitted through each bearer tunnel between the network elements on the wireless side , if the data is not suitable for route optimization, the data is encapsulated on the relevant bearer of the core network; or no routing policy is used, and all data dedicated to the route optimization bearer are transmitted through each bearer tunnel between network elements on the wireless side.

Wherein, the method also includes:

PCRF establishes a dedicated bearer for both communication parties or designates a certain bearer for the transmission of route optimization data of both communication parties;

When the service gateway determines that the communication parties establish a routing channel through the service gateway without passing through the core network, according to the source address, destination address, service quality QoS level or bearer mark of the bearer to which the routing optimization data belongs, it will be the dedicated link established for the communication between the two parties. Bearer binding, the service gateway determines which data to perform routing optimization according to the routing policy, and sends the data that needs routing optimization to the wireless side network element through the bound S1-U or S12 bearer; or does not perform routing optimization, and sends the dedicated All data on the bearer is sent to the network element on the radio side through the bound S1-U or S12 bearer.

Wherein, the network element on the wireless side includes: an evolved base station, a base station controller, a home base station, a home evolved base station, and a home base station gateway;

The anchor gateway includes a packet data gateway P-GW and a gateway GPRS support node GGSN.

A service gateway, including an acquisition unit, a determination unit and an execution unit, wherein:

an acquisition unit, configured to acquire routing optimization decision information;

A determination unit, configured to execute a route optimization determination according to the route optimization determination information, and trigger an execution unit when it is determined that route optimization can be performed;

The execution unit is configured to execute the establishment of the routing optimization channel.

Wherein, the route optimization decision information includes route optimization subscription information and/or route optimization strategy, and information for determining the positional relationship between the communication parties.

Wherein, the judging unit is further configured to determine that the routing optimization subscription information and/or routing optimization strategies of both communicating parties allow routing optimization, and when the communicating parties are located in the same serving gateway service area, it is determined that the The communication parties can perform route optimization.

A routing optimization system, including a serving gateway, a mobility management unit, an anchor gateway, a subscription data server, a PCRF, a wireless side network element, and a communicating party; wherein, the serving gateway is used to determine information based on the obtained routing optimization Execute route optimization determination, and when it is determined that route optimization can be performed, establish a route optimization channel.

Wherein, the route optimization decision information includes route optimization subscription information and/or route optimization strategy, and information for determining the positional relationship between the communication parties.

Wherein, the serving gateway is further configured to determine that the routing optimization subscription information and/or routing optimization strategies of both communicating parties allow route optimization, and when the communicating parties are located in the same serving gateway service area, it is determined that the The communication parties can perform route optimization.

Wherein, the service gateway obtains the subscription information of route optimization and/or the strategy information of route optimization, which is:

The mobility management unit sends the route-optimized subscription information and/or route-optimized policy information received from the subscription data server to the serving gateway when creating a session or modifying an existing bearer;

Alternatively, the configuration network element in the network configures the communication party's route optimization subscription information and/or route optimization policy information as configuration information into the service gateway.

Or, the anchor gateway initiates an IP connection with the policy and charging rules functional entity PCRF to access the network IP-CAN session creation or modification process, and obtains the communication party's route optimization subscription information and/or route optimization strategy from the PCRF information and forward it to the service gateway.

Or, when the PCRF actively initiates bearer establishment or bearer modification, it sends the communication party's route-optimized subscription information and/or route-optimized policy information to the anchor point gateway, and the anchor point gateway sends the route-optimized contract information and/or Or route optimization policy information is sent to the service gateway.

Wherein, the information obtained by the service gateway for determining the positional relationship between the communication parties is:

The anchor gateway initiates an IP connection with the PCRF to access the network during the creation or modification of the IP-CAN session, and forwards the transport flow template TFT specified by the PCRF during the establishment or modification of the IP-CAN session or bearer To the service gateway; the service gateway obtains the IP address of the attached communication party from the TFT;

Or, when the PCRF initiates bearer establishment or bearer modification, it will notify the anchor point gateway of the TFT used by the IP-CAN session or bearer specified in the IP-CAN session creation or modification process, and the anchor point gateway will forward the TFT To the service gateway; the service gateway obtains the IP address of the attached communication party from the TFT;

Or, the service gateway parses out the IP address of the attached communicating party from the header of the received data packet;

Alternatively, the anchor point gateway obtains the IP address of the attached communicating party through the process of assigning an IP address or monitoring the process of a DHCP message, and then notifies the serving gateway.

Wherein, the information obtained by the service gateway for determining the positional relationship between the communication parties is:

Configuring the network element to send the base station topology information capable of serving the serving gateway to the serving gateway;

Alternatively, the service gateway initiates a DNS query request to the DNS server of the communication parties, and the DNS server queries the location relationship between the base stations serving the communication parties according to the saved wireless network topology, and notifies the service gateway.

Wherein, the service gateway is also used to enable the communication parties to establish a routing channel through the service gateway without passing through the core network;

Alternatively, the communication parties are allowed to establish a routing channel through the wireless side network element instead of the core network.

Wherein, the service gateway is also used to determine that when the communication parties establish a routing channel through the wireless side network element without passing through the core network, the obtained TFT, the formulated routing optimization strategy, and the wireless side network element address of the communication counterparty belong to Send it to the network element on the wireless side attached to the communication party through the mobility management unit;

Establish routing optimization channels between the wireless side network elements attached to each other by the communication parties through the peer address;

The wireless side network element is used to, when receiving the data sent by the non-core network, match the data to the corresponding radio bearer according to the TFT or match the data to the dedicated bearer of the communication parties, and when receiving the data sent by the communication party When sending data, it is determined according to the routing policy whether to route through the core network or route through the route optimization channel.

Alternatively, the service gateway is also used to determine that when the communication parties establish a routing channel through the service gateway without passing through the core network, the data that needs to be optimized for routing is matched to the corresponding S1-U or S12 bearer through the TFT or matched to the PCRF as On the dedicated bearer determined by both communication parties, the non-locally routed data is sent to the core network bearer for routing through the core network, and the data requiring route optimization is encapsulated on the corresponding S1-U or S12 bearer and sent to the bearer attached to the communicating party The network element on the wireless side, and then sends it to the communication counterpart.

Alternatively, the PCRF is used to establish a dedicated bearer for both communication parties or designate a certain bearer for the transmission of route optimization data of both communication parties;

The service gateway is also used to determine that when the communication parties establish a routing channel through the wireless side network element without passing through the core network, the bearer type, route optimization strategy, bearer label, and the address of the wireless side network element to which the communicating party belongs are passed through the mobility management The unit sends to the network element on the wireless side attached to the communicating party;

The network element on the wireless side is used to establish a route optimization channel matching each bearer according to the bearer label; the data on the bearer dedicated to route optimization is judged according to the routing policy. If the data is not suitable for route optimization, the data will be encapsulated on the relevant bearer of the core network; or if no routing policy is used, all data dedicated to the route optimization bearer will be transmitted through each bearer tunnel between network elements on the wireless side .

Alternatively, the PCRF is used to establish a dedicated bearer for both communication parties or designate a certain bearer for the transmission of route optimization data of both communication parties;

The service gateway is also used to determine that when the communication parties establish a routing channel through the service gateway without passing through the core network, according to the source address, destination address, quality of service QoS level or bearer mark of the route optimization data, the two communication parties will communicate with each other. The established dedicated bearer is bound, and the service gateway determines which data to perform routing optimization according to the routing strategy, and sends the data to be routed to the network element on the wireless side through the bound S1-U or S12 bearer; or does not perform routing Optimization, all data on the dedicated bearer is sent to the wireless side network element through the bound S1-U or S12 bearer.

In the present invention, the service gateway executes the route optimization judgment according to the obtained route optimization judgment information, and executes the establishment of the route optimization channel when it is judged that the route optimization can be performed. Wherein, the route optimization decision information includes route optimization subscription information and/or route optimization strategy, and information for determining the positional relationship between the communication parties. When it is determined that the route optimization subscription information and/or route optimization strategies of both communication parties allow route optimization, and both communication parties are located in the same serving gateway service area, perform route optimization for both communication parties. The technical scheme of the invention can reduce the time delay of data transmission and reduce the network burden of the core network.

Description of drawings

FIG. 1 is a schematic structural diagram of an evolved packet domain system;

FIG. 2 is a schematic diagram of a user receiving/sending data path;

Fig. 3 (a), (b) is the schematic diagram of routing optimization channel of the present invention;

Fig. 4 (a) to (g) is the schematic diagram that service gateway of the present invention acquires routing optimization decision information;

FIG. 5 is a flow chart of routing optimization judgment in Embodiment 1 of the present invention;

FIG. 6 is a flow chart of routing optimization judgment in Embodiment 2 of the present invention;

FIG. 7 is a flow chart of a routing optimization method in Embodiment 1 of the present invention;

FIG. 8 is a flow chart of a routing optimization method in Embodiment 2 of the present invention;

FIG. 9 is a flowchart of a routing optimization method according to Embodiment 3 of the present invention;

FIG. 10 is a flowchart of a route optimization method according to Embodiment 4 of the present invention;

FIG. 11 is a flow chart of a routing optimization method according to Embodiment 5 of the present invention;

FIG. 12 is a flow chart of a routing optimization method in Embodiment 6 of the present invention;

FIG. 13 is a schematic diagram of the composition and structure of the service gateway according to the embodiment of the present invention.

Detailed ways

The basic idea of the present invention is: the service gateway executes the routing optimization judgment according to the obtained routing optimization judgment information, and executes the establishment of the routing optimization channel when it is judged that the routing optimization can be performed.

The routing optimization method of the present invention is applicable to two users communicating with each other under the same service gateway, and the two users may use the same/different anchor gateways, and the present invention is not limited to core network elements.

Figure 3(a), (b) is a schematic diagram of the route optimization channel of the present invention, as shown in Figure 3(a), 3(b), the applicable scenarios of the route optimization method of the present invention include the same service gateway and the same anchor gateway situation (Figure 3(a)), and the situation of the same serving gateway but different anchor gateways (Figure 3(b)). The anchor gateway includes: P-GW, GGSN.

There are two types of route optimization channels. Route optimization channel 1 is a route optimization channel formed between network elements on the wireless side to which users are attached, and route optimization channel 2 is the data forwarding of two users intercommunicated by the service gateway. Route optimization channels 1 and 2 no longer pass through the core network. In the figure, the wireless side network elements include: evolved base station (eNB), radio network controller (RNC), home base station (HNB), home evolved base station (HeNB), home base station gateway (H(e)NB GW) and other wireless devices .

In the present invention, the conditions for the service gateway to determine that route optimization can be performed are mainly divided into two aspects: one is policy permission, and the other is whether the intercommunicating users are in the same service gateway service area. Wherein, the policy refers to whether the user can subscribe for route optimization and/or implement the data policy of route optimization, which is determined by the operator. The policy information can be dynamically or statically configured on the service gateway.

If the service gateway wants to determine whether two intercommunicating users are in the same service gateway service area, it needs to know the corresponding relationship between the destination IP address in the forwarded data packet and the two intercommunicating users. Therefore, the serving gateway needs to know the IP addresses of all users for which user plane tunnels are provided. In addition, the serving gateway also needs to know the location topology of the base stations it serves. If the two intercommunicating users are located in adjacent or relatively close base stations, the serving gateway can optimize the route between the base stations; if the two intercommunicating users If the location is far away, the service gateway can forward data for the two intercommunicating users.

The service gateway can obtain policy information in the following ways:

Way 1, as shown in Figure 4a, includes the following steps:

Step 4a01, the core network mobility management unit (MME or SGSN) receives the non-access stratum mobility management message (such as attach, location update, etc.) sent by the terminal.

Step 4a02, the mobility management unit sends a location update request message to the home subscription data server (HSS or HLR), and registers the information of the mobility management unit to which the user is attached to the home subscription data server.

In step 4a03, the subscription data server replies with a request message for inserting user data, and the message carries policy information required for route optimization determination. The policy information includes whether the subscription for routing optimization can be performed, which can be per user or per user per APN. The subscription information also includes a data policy for implementing route optimization, for example, specifying that data on certain subscribed QoS bearers can perform route optimization.

In step 4a04, the mobility management unit of the core network returns an insert user data response message.

In step 4a05, the subscription data server replies with a location update response message.

In step 4a06, the core network mobility management unit creates a core network session or modifies an existing bearer, and sends policy information to the serving gateway in a session creation or bearer modification request message. The policy information includes whether the user can subscribe for route optimization, and the operator's data policy for route optimization. The granularity of policy information is not limited, and it can be per user, per user per APN, per user per bearer, per IP flow, or a unified network policy per bearer, per APN, etc.

In step 4a07, the service gateway replies with a session creation or bearer modification response message.

Way 2, as shown in Figure 4b, includes the following steps:

In step 4b01, a configuration network element in the network (for example, a network management system) sends policy information to the serving gateway when configuring per-device information for the serving gateway. The policy information is the routing optimization policy for each device, and the granularity is not limited. It can be per bearer, or per IP flow (flow), or per application.

In step 4b02, the service gateway replies with a configuration response message.

Method 2 is used in the process of configuring parameters when the service gateway accesses the network.

Way 3, as shown in Figure 4c, includes the following steps:

In step 4c01, the core network mobility management unit (MME or SGSN) sends a session creation or bearer modification request message to the serving gateway.

In step 4c02, the serving gateway forwards the session creation or bearer modification request message to the anchor gateway (P-GW, GGSN).

In step 4c03, the anchor point gateway interacts with the PCRF. During the creation or modification of the IP-CAN session, the PCRF sends the policy information to the anchor point gateway. The granularity of policy information is not limited, and can be per bearer, per user per bearer, per IPflow, per bearer per IP flow, and so on.

In step 4c04, the anchor gateway replies to the service gateway with a session creation or bearer modification response message, and the message carries policy information.

In step 4c05, the serving gateway replies a create session/modify bearer response message to the core network mobility management unit.

It should be noted that if the PCRF actively initiates bearer establishment or modification, the policy information can also be carried to the serving gateway in the bearer creation or modification request message initiated by the anchor gateway. This implementation mode is similar to the third mode and will not be described in detail.

The service gateway can obtain the IP address of the user providing the user plane in the following ways:

Way 1, as shown in Figure 4d, includes the following steps:

In step 4d01, the core network mobility management unit (MME or SGSN) serving gateway sends a session creation request message or a bearer modification request message.

In step 4d02, the service gateway forwards the create session/modify bearer request message to the anchor gateway.

In step 4d03, an IP-CAN session creation/modification process is executed between the anchor gateway and the PCRF. In this process, the PCRF specifies the Transport Flow Template (TFT, Traffic Flow Template) used by the session or the bearer.

In step 4d04, the anchor gateway replies to the service gateway with a session creation response message or a bearer modification response message, and the message carries the TFT specified by the PCRF.

In step 4d05, the serving gateway replies a session creation or bearer modification response message to the core network mobility management unit. The service gateway learns the IP address of the attached user from the address in the TFT.

It should be noted that if the PCRF actively initiates bearer establishment or modification, the TFT information can also be carried to the serving gateway through the bearer establishment or modification request message initiated by the anchor gateway, and the network element on the wireless side obtains the IP address of the attached user from the TFT information. This implementation manner is similar to the manner 1 and will not be described in detail.

In the second way, the service gateway adds a data packet inspection function, obtains the IP address from the data packet header, and records it as the IP address information of the attached user.

Method 3, as shown in Figure 4e, includes the following steps:

In step 4e01, the core network anchor gateway (P-GW or GGSN) obtains the user's IP address through the IP address allocation process or the process of monitoring Dynamic Host Configuration Protocol (DHCP, Dynamic Host Configuration Protocol) messages.

In step 4e02, the core network anchor gateway notifies the service gateway of the user's IP address through a GTP message or a special notification message or a special data packet.

In step 4e03, the service gateway replies with a response message.

The service gateway can obtain the topology information of the base stations in the service area in the following ways:

Way 1, as shown in Figure 4f, includes the following steps:

In step 4f01, a configuration network element (such as a network management system) in the network sends a configuration request message to the service gateway along with topology information of base stations that it can serve.

Step 4f02, after receiving the topology information, the service gateway stores it and replies a configuration response message to the configuration network element.

When the subsequent serving gateway determines whether the base stations where the intercommunication users are located are adjacent, the determination can be made based on the delivered topology information. The serving gateway determines whether to perform route optimization between two base stations or whether the serving gateway is responsible for forwarding route optimization according to the determination result.

Way 2, as shown in Figure 4g, includes the following steps:

In step 4g01, the service gateway initiates a DNS query request when it needs to determine whether the base stations where the two intercommunicating users are located are adjacent, and the request message carries the base station ID of the base station where the users are located as the input of the query.

In step 4g02, the DNS server queries the location relationship of the two base stations according to the saved wireless network topology. The result of whether the two base stations are adjacent is carried in the inquiry response message.

According to the query result, the serving gateway determines whether to perform route optimization between two base stations or whether the serving gateway is responsible for forwarding route optimization.

After the route optimization decision information is obtained through the method shown in FIG. 4 , the service gateway can perform the route optimization decision process.

Fig. 5 is the routing optimization judgment flow chart of embodiment 1 of the present invention, as shown in Fig. 5, the routing optimization judgment of this embodiment comprises the following steps:

Step 501, the service gateway checks the source IP address and destination IP address in the received data packet.

Step 502, the service gateway determines whether the user with the source IP address and the destination IP address is attached to the service gateway according to the stored user IP address. If yes, then follow up steps are performed, if not, then the decision process ends.

In step 503, the service gateway determines whether the user is under the adjacent wireless side network element (including the same wireless side network element) according to the information of the base station to which the user is attached. If so, execute the operation of branch one, if not, execute the operation of branch two.

Branch one:

Step 504, the service gateway determines whether the user can perform route optimization according to the obtained subscription information. If yes, then follow up steps are performed, if not, then the decision process ends.

Step 505, the service gateway judges whether the received data packet can be optimized for routing according to the obtained data policy, if yes, then executes subsequent steps, if not, then the judging process ends.

In step 506, the serving gateway starts a route optimization process between network elements on the wireless side.

Branch two:

Step 504, the service gateway determines whether the user can perform route optimization according to the obtained subscription information. If yes, then follow up steps are performed, if not, then the decision process ends.

Step 505, the service gateway judges whether the received data packet can be optimized for routing according to the obtained data policy, if yes, then executes subsequent steps, if not, then the judging process ends.

In step 506, the serving gateway starts the routing optimization process at the serving gateway level, that is, the serving gateway is responsible for forwarding the routing optimization data.

It should be noted that the sequence of step 504 and step 505 can be interchanged, and the steps can be executed optionally.

Fig. 6 is the flow chart of the routing optimization judgment of the second embodiment of the present invention, as shown in Fig. 6, the routing optimization judgment of the present embodiment includes the following steps:

After the route optimization decision information is obtained through the method shown in FIG. 4 , the service gateway can perform the route optimization decision process.

Step 601, the service gateway checks the source IP address and destination IP address in the received data packet.

In step 602, the service gateway determines whether the user with the source IP address and the destination IP address is attached to the service gateway according to the stored user IP address. If yes, then follow up steps are performed, if not, then the decision process ends.

Step 603, the service gateway determines whether the user can perform route optimization according to the obtained subscription information. If yes, then follow up steps are performed, if not, then the decision process ends.

Step 604, the service gateway judges whether the received data packet can be optimized for routing according to the obtained data policy, if yes, then executes subsequent steps, if not, then the judging process ends.

In step 605, the serving gateway determines whether the user is under the adjacent wireless side network element (including the same wireless side network element) according to the information of the base station to which the user is attached. If yes then perform step 606a, if not then perform step 606b.

Step 606a, start a route optimization operation between network elements on the wireless side.

Step 606b, start route optimization at the service gateway level (that is, the service gateway is responsible for forwarding route optimization data).

FIG. 7 is a flow chart of a route optimization method in Embodiment 1 of the present invention. As shown in FIG. 7 , the route optimization method in this embodiment includes the following steps:

Step 701, the process described in Figure 4d, the service gateway obtains the TFT corresponding to the bearer.

Step 702: When the serving gateway receives the data packet, it makes a route optimization decision according to the process shown in Figure 5 or Figure 6. If it is determined to perform route optimization between network elements on the wireless side, it needs to match the bearer with the TFT information and the route optimization channel pair Notify the wireless side network element and other information to the wireless side network element. Specifically, the service gateway sends an update bearer request message or a separately defined GTP request message to the mobility management unit 1 in charge of managing user 1, and the message carries the user address, bearer-related TFT, routing optimization policy, peer wireless side network element Address and other information.

In step 703, the mobility management unit 1 sends the information described in step 702 to the wireless side network element 1 to which the user 1 is attached by modifying the bearer request message or the newly defined S1/Iu interface message.

In step 704, the wireless side network element 1 replies with a response message of modifying the bearer or newly defining the S1/Iu interface.

In step 705, the mobility management unit 1 replies with an update bearer response message or a newly defined GTP response message to confirm that the bearer matching message has been sent.

Step 706, as described in step 702, if the service network decides to perform route optimization between wireless side network elements, it needs to notify the wireless side network element of information such as the bearer matching TFT information and the peer wireless side network element of the routing optimization channel. Specifically, the serving gateway sends an update bearer request message or a separately defined GTP request message to the mobility management unit 2 in charge of managing user 2, and the message carries the user address, bearer-related TFT, routing optimization policy, peer wireless side network element Address and other information.

In step 707, the mobility management unit 2 sends the information in step 706 to the wireless side network element 2 to which the user 2 is attached by modifying the bearer request message or the newly defined S1/Iu interface message.

In step 708, the wireless side network element 2 replies with a response message of modifying the bearer or newly defining the S1/Iu interface.

In step 709, the mobility management unit 2 replies with an update bearer response message or a newly defined GTP response message to confirm that the bearer matching message has been sent.

In step 710, a route optimization channel is established between the wireless side network element 1 and the wireless side network element 2 through the peer address, and the channel may be an end-to-end IP tunnel or a path routed through an IP address.

Step 711 , when the wireless side network element receives the data sent from the non-core network tunnel, it matches the data to the corresponding radio bearer according to the TFT information. When the network element on the wireless side receives the uplink data sent by the terminal, it determines whether the data is routed through the core network or routed through the route optimization channel according to the routing strategy.

FIG. 8 is a flow chart of a routing optimization method in Embodiment 2 of the present invention. As shown in FIG. 8 , the routing optimization method in this embodiment includes the following steps:

Step 801, the process described in Figure 4d, the service gateway obtains the TFT corresponding to the bearer.

Step 802: When the service gateway receives the data packet, it makes a route optimization decision according to the process described in Figure 5 or Figure 6, and if the network element on the wireless side to which the user is attached is far away, it decides to perform route optimization forwarded by the service gateway.

In step 803, the service gateway matches the data requiring route optimization to the corresponding S1-U or S12 bearer through TFT, and sends the non-locally routed data to the core network bearer for routing through the core network.

Step 804, the data requiring route optimization is encapsulated into the corresponding S1-U or S12 bearer and sent to the wireless side network element 2 to which the user 2 is attached.

FIG. 9 is a flow chart of a route optimization method in Embodiment 3 of the present invention. As shown in FIG. 9 , the route optimization method in this embodiment includes the following steps:

In step 901, the serving gateway receives the uplink data sent by the network element 1 on the wireless side.

Step 902: If the serving gateway determines that route optimization needs to be performed according to FIG. 5 or FIG. 6, but there is no bearer matching TFT, perform the subsequent step of obtaining TFT.

Step 903, the serving gateway sends a TFT information acquisition request message to the anchor gateway (the message can be based on an existing bearer establishment/modification message, or a new GTP message is defined), and the IMSI is used in the message to identify the user who needs to perform route optimization.

In step 904, the anchor gateway replies with a TFT information acquisition response message, which includes the user identifier IMSI, the bearer identifier allocated to the user, and TFT information corresponding to the bearer.

Step 905, the service gateway sends the user address information, TFT information, routing policy information, bearer identification information, and peer wireless side network element address information to the mobility management user 1 through an update bearer request message or a newly defined GTP request message snap-in1.

In step 906, the mobility management unit 1 converts the identifier in the parameter information into a radio bearer identifier that can be recognized by the radio side network element.

Step 907, the core network mobility management unit 1 sends the user address, TFT information, routing policy information, peer wireless side network element information and radio bearer identification information to Wireless-side network element 1 serving user 1.

Step 908, the radio side network element 1 returns a radio bearer modification response message or a newly defined S1/Iu interface message to confirm that the bearer matching information is received.

In step 909, the core network mobility management unit 1 replies an update bearer response message or a newly defined GTP message to the serving gateway, and confirms that the bearer matching information is received.

In step 910, the serving gateway performs the same as steps 905 to 909, and sends the bearer matching information and routing policy to the network element 2 on the wireless side.

Step 911 , establish a routing optimization channel between the wireless side network element 1 and the wireless side network element 2 through the peer address. The channel can be an end-to-end IP tunnel or a path through IP address routing.

Step 912, when the wireless side network element receives the data sent from the non-core network tunnel, it matches the data to the corresponding radio bearer according to the TFT information. When the network element on the wireless side receives the uplink data sent by the terminal, it determines whether the data is routed through the core network or routed through the route optimization channel according to the routing strategy.

FIG. 10 is a flow chart of a route optimization method in Embodiment 4 of the present invention. As shown in FIG. 10 , the route optimization method in this embodiment includes the following steps:

Step 1001, the serving gateway receives the uplink data sent by the network element 1 on the wireless side.

Step 1002, if the serving gateway determines that route optimization needs to be performed according to FIG. 5 or FIG. 6, but there is no bearer matching TFT, perform the subsequent step of obtaining TFT.

Step 1003, the serving gateway sends a TFT information acquisition request message to the anchor gateway (the message can be based on an existing bearer establishment/modification message, or a new GTP message is defined), and the IMSI is used in the message to identify the user who needs to perform route optimization.

In step 1004, the anchor returns a TFT information acquisition response message, which includes the user identifier IMSI, the bearer identifier assigned to the user, and TFT information corresponding to the bearer.

Step 1005, if the network element on the wireless side to which the interworking user is attached is far away, the serving gateway decides to perform route optimization for forwarding by the serving gateway. The service network matches the data that needs routing optimization to the corresponding S1-U or S12 bearer through TFT, and sends the non-locally routed data to the core network bearer for routing through the core network.

Step 1006, the data requiring route optimization is encapsulated into the corresponding S1-U or S12 bearer and sent to the wireless side network element 2 to which the user 2 is attached.

Fig. 11 is a flow chart of the routing optimization method of Embodiment 5 of the present invention. As shown in Fig. 11, the routing optimization method of this embodiment includes the following steps:

In step 1101, the PCRF establishes a dedicated bearer for the two intercommunicating users during the bearer establishment process. Or designate a certain bearer to be used for the transmission of route optimization data of two users, identify the bearer through a label, and bearers used for intercommunicating route optimization of two users have the same label. The service gateway records the corresponding relationship between the source address, the destination address, and the bearer identifier of the dedicated bearer, or records the bearer mark.

When the service gateway decides to perform route optimization between network elements on the wireless side, it sends the bearer type, user address, route optimization policy, and bearer label information to the mobility management unit 1 that manages user 1 through an update bearer request message or a newly defined GTP message . The bearer type is used to indicate that the bearer is dedicated to route optimization data transmission, the user address is used to indicate which user performs route optimization, and the route optimization strategy is used to distinguish which data in the bearer needs to be sent to the core network through the optimized path , the bearer label is specially used between two intercommunicating users, and is used for matching between bearers.

Step 1102, the mobility management unit 1 sends the bearer type, user address, routing optimization policy, and bearer label information to the wireless side network element 1 serving user 1 through a radio bearer modification message or a newly defined S1/Iu interface message.

Step 1103 , the radio side network element 1 replies to the mobility management unit 1 with a radio bearer modification or newly defined S1/Iu interface response message.

Step 1104, the mobility management unit 1 replies an update bearer response or a newly defined GTP response message to the serving gateway, to confirm that information related to bearer matching has been received.

Step 1105, the service gateway sends the bearer type, user address, routing optimization policy, and bearer label information to the mobility management unit 2 that manages the user 2 through an update bearer request message or a newly defined GTP message.

Step 1106, the mobility management unit 2 sends the bearer type, user address, routing optimization policy, and bearer label information to the wireless side network element 2 serving user 2 through a radio bearer modification message or a newly defined S1/Iu interface message.

Step 1107 , the radio side network element 2 replies to the mobility management unit 2 with a radio bearer modification or newly defined S1/Iu interface response message.

In step 1108, the mobility management unit 2 replies an update bearer response or a newly defined GTP response message to the serving gateway to confirm that information related to bearer matching has been received.

Step 1109, the radio-side network element 1 and the radio-side network element 2 establish a routing optimization channel matching each bearer according to the bearer label.

Step 1110, the wireless side network element starts the route optimization process for the bearer whose bearer type is dedicated to route optimization, the data on this type of bearer is determined using the routing policy, and if the data is suitable for route optimization, it is passed through the wireless side network element 1 and the wireless Each bearer tunnel between side network elements 2 is transmitted. If the data is not suitable for route optimization, the data is delivered to the relevant bearer of the core network. This embodiment also supports route optimization of the entire bearer data, and the routing policy is not enabled at this time.

FIG. 12 is a flow chart of a route optimization method in Embodiment 1 of the present invention. As shown in FIG. 12 , the route optimization method in this embodiment includes the following steps:

In step 1201, the PCRF establishes a dedicated bearer for the two intercommunicating users during the bearer establishment process. Or designate a certain bearer to be used for the transmission of route optimization data of two users, identify the bearer through a label, and bearers used for intercommunicating route optimization of two users have the same label. The service gateway records the corresponding relationship between the source address, the destination address and the bearer identifier of the dedicated bearer, or records the bearer's mark.

Step 1202, when the serving gateway receives the data packet, it makes a route optimization decision according to the process described in Figure 5 or Figure 6, and if the network element on the wireless side to which the user is attached is far away, it decides to perform route optimization forwarded by the serving gateway.

In step 1203, the service gateway binds the dedicated bearer established for the intercommunication between the two users according to the source address, destination address, QoS level parameter or bearer mark of the bearer to which the routing optimization data belongs. The route optimization data is directly sent to the wireless side network element 2 through the bearer of the bound S1-U or S12.

The service gateway can determine which data to perform routing optimization according to the routing policy, and send it to the wireless side network element 2 through the bound bearer, or do not activate the routing policy, and perform routing optimization on all data on the dedicated bearer.

In step 1204, the service gateway directly sends the route optimization data to the network element 2 on the wireless side.

Fig. 13 is a schematic diagram of the composition and structure of the service gateway of the embodiment of the present invention. As shown in Fig. 13, the service gateway of the embodiment of the present invention includes an acquisition unit 130, a determination unit 131 and an execution unit 132, wherein:

An acquisition unit 130, configured to acquire routing optimization decision information;

A determination unit 131, configured to execute a route optimization determination according to the route optimization determination information, and trigger the execution unit 132 when it is determined that route optimization can be performed;

The execution unit 132 is configured to execute establishment of a route optimization channel.

Wherein, the route optimization decision information includes route optimization subscription information and/or route optimization strategy, and information for determining the positional relationship between the communication parties.

The judging unit 131 is further configured to determine that the routing optimization subscription information and/or routing optimization strategies of the communication parties allow route optimization, and when the communication parties are located in the same service gateway service area, it is determined that the communication parties are It can perform route optimization.

The mobility management unit sends the route-optimized subscription information and/or route-optimized policy information received from the subscription data server to the obtaining unit 130 when creating a session or modifying an existing bearer;

Alternatively, the acquiring unit 130 is further configured to acquire the route optimization subscription information and/or route optimization policy information of the communication party from the configuration network element in the network.

Or, when the anchor gateway initiates the creation or modification of the IP-CAN session with the policy and the PCRF, it obtains the communication party's route-optimized subscription information and/or route-optimized policy information from the PCRF, and forwards them to the obtaining unit 130 .

Or, when the PCRF actively initiates bearer establishment or bearer modification, it sends the communication party's route-optimized subscription information and/or route-optimized policy information to the anchor point gateway, and the anchor point gateway sends the route-optimized contract information and/or Or route optimized policy information is sent to the acquisition unit 130 .

The anchor gateway initiates an IP connection with the PCRF to access the network during the creation or modification of the IP-CAN session, and forwards the transport flow template TFT specified by the PCRF during the establishment or modification of the IP-CAN session or bearer to the acquisition unit 130.

The obtaining unit 130 obtains the IP address of the attached communicating party from the TFT.

Or, when the PCRF initiates bearer establishment or bearer modification, it will notify the anchor point gateway of the TFT used by the IP-CAN session or bearer specified in the IP-CAN session creation or modification process, and the anchor point gateway will forward the TFT to the acquisition unit 130.

The obtaining unit 130 obtains the IP address of the attached communicating party from the TFT.

Alternatively, the obtaining unit 130 parses out the IP address of the attached communication party from the header of the received data packet.

Alternatively, the anchor gateway notifies the acquiring unit 130 after acquiring the IP address of the attached communicating party through an IP address allocation process or a DHCP message monitoring process.

The acquiring unit 130 acquires topology information of base stations that can serve the serving gateway from configuration network elements.

Alternatively, the service gateway initiates a DNS query request to the DNS server of the communication parties, and the DNS server queries the location relationship between the base stations serving the communication parties according to the saved wireless network topology, and notifies the acquisition unit 130 .

In the present invention, both communication parties share one serving gateway, one anchor gateway or different anchor gateways.

The execution unit 132 is also used to enable the communication parties to establish a routing channel through the service gateway without passing through the core network;

Alternatively, the communication parties are allowed to establish a routing channel through the wireless side network element instead of the core network.

Network elements on the wireless side include: evolved base stations, base station controllers, home base stations, home evolved base stations, and home base station gateways;

The anchor gateway includes a packet data gateway P-GW and a gateway GPRS support node GGSN.

Those skilled in the art should understand that the implementation functions of each processing unit in the service gateway shown in FIG. 13 can be understood with reference to the relevant description of the aforementioned route optimization method. Those skilled in the art should understand that the functions of each processing unit in the service gateway shown in FIG. 13 can be realized by a program running on a processor, or can be realized by a specific logic circuit.

The present invention also describes a routing optimization system, including network elements such as a service gateway, a mobility management unit, an anchor gateway, a subscription data server, a PCRF, and a communication party; wherein, the service gateway is used to, according to the obtained route The optimization determination information executes route optimization determination, and when it is determined that route optimization can be performed, establishes a route optimization channel.

Wherein, the route optimization decision information includes route optimization subscription information and/or route optimization strategy, and information for determining the positional relationship between the communication parties.

Wherein, the serving gateway is further configured to determine that the routing optimization subscription information and/or routing optimization strategies of both communicating parties allow route optimization, and when the communicating parties are located in the same serving gateway service area, it is determined that the The communication parties can perform route optimization.

Wherein, the service gateway obtains the subscription information of route optimization and/or the strategy information of route optimization, which is:

The mobility management unit sends the route-optimized subscription information and/or route-optimized policy information received from the subscription data server to the serving gateway when creating a session or modifying an existing bearer;

Alternatively, the configuration network element in the network configures the communication party's route optimization subscription information and/or route optimization policy information as configuration information into the service gateway.

Or, the anchor gateway initiates an IP connection with the policy and charging rules functional entity PCRF to access the network IP-CAN session creation or modification process, and obtains the communication party's route optimization subscription information and/or route optimization strategy from the PCRF information and forward it to the service gateway.

Or, when the PCRF actively initiates bearer establishment or bearer modification, it sends the communication party's route-optimized subscription information and/or route-optimized policy information to the anchor point gateway, and the anchor point gateway sends the route-optimized contract information and/or Or route optimization policy information is sent to the service gateway.

Wherein, the information obtained by the service gateway for determining the positional relationship between the communication parties is:

The anchor gateway initiates an IP connection with the PCRF to access the network during the creation or modification of the IP-CAN session, and forwards the transport flow template TFT specified by the PCRF during the establishment or modification of the IP-CAN session or bearer To the service gateway; the service gateway obtains the IP address of the attached communication party from the TFT;

Or, when the PCRF initiates bearer establishment or bearer modification, it will notify the anchor point gateway of the TFT used by the IP-CAN session or bearer specified in the IP-CAN session creation or modification process, and the anchor point gateway will forward the TFT To the service gateway; the service gateway obtains the IP address of the attached communication party from the TFT;

Or, the service gateway parses out the IP address of the attached communicating party from the header of the received data packet;

Alternatively, the anchor point gateway obtains the IP address of the attached communicating party through the process of assigning an IP address or monitoring the process of a DHCP message, and then notifies the serving gateway.

Wherein, the information obtained by the service gateway for determining the positional relationship between the communication parties is:

Configuring the network element to send the base station topology information capable of serving the serving gateway to the serving gateway;

Alternatively, the service gateway initiates a DNS query request to the DNS server of the communication parties, and the DNS server queries the location relationship between the base stations serving the communication parties according to the saved wireless network topology, and notifies the service gateway.

Wherein, the service gateway is also used to enable the communication parties to establish a routing channel through the service gateway without passing through the core network;

Alternatively, the communication parties are allowed to establish a routing channel through the wireless side network element instead of the core network.

Wherein, the service gateway is also used to determine that when the communication parties establish a routing channel through the wireless side network element without passing through the core network, the obtained TFT, the formulated routing optimization strategy, and the wireless side network element address of the communication counterparty belong to Send it to the network element on the wireless side attached to the communication party through the mobility management unit;

Establish routing optimization channels between the wireless side network elements attached to each other by the communication parties through the peer address;

The wireless side network element is used to, when receiving the data sent by the non-core network, match the data to the corresponding radio bearer according to the TFT or match the data to the dedicated bearer of the communication parties, and when receiving the data sent by the communication party When sending data, it is determined according to the routing policy whether to route through the core network or route through the route optimization channel.

Wherein, the service gateway is also used to determine that when the communication parties establish a routing channel through the service gateway without going through the core network, the data that needs to be routed is matched to the corresponding S1-U or S12 bearer through the TFT or matched to the PCRF as On the dedicated bearer determined by both communication parties, the non-locally routed data is sent to the core network bearer for routing through the core network, and the data requiring route optimization is encapsulated on the corresponding S1-U or S12 bearer and sent to the bearer attached to the communicating party The network element on the wireless side, and then sends it to the communication counterpart.

Among them, the PCRF is used to establish a dedicated bearer for both communication parties or designate a certain bearer for the transmission of route optimization data of both communication parties;

The service gateway is also used to determine that when the communication parties establish a routing channel through the wireless side network element without passing through the core network, the bearer type, route optimization strategy, bearer label, and the address of the wireless side network element to which the communicating party belongs are passed through the mobility management The unit sends to the network element on the wireless side attached to the communicating party;

The network element on the wireless side is used to establish a route optimization channel matching each bearer according to the bearer label; the data on the bearer dedicated to route optimization is judged according to the routing policy. If the data is not suitable for route optimization, the data will be encapsulated on the relevant bearer of the core network; or if no routing policy is used, all data dedicated to the route optimization bearer will be transmitted through each bearer tunnel between network elements on the wireless side .

Among them, the PCRF is used to establish a dedicated bearer for both communication parties or designate a certain bearer for the transmission of route optimization data of both communication parties;

The service gateway is also used to determine that when the communication parties establish a routing channel through the service gateway without passing through the core network, according to the source address, destination address, quality of service QoS level or bearer mark of the route optimization data, the two communication parties will communicate with each other. The established dedicated bearer is bound, and the service gateway determines which data to perform routing optimization according to the routing strategy, and sends the data to be routed to the network element on the wireless side through the bound S1-U or S12 bearer; or does not perform routing Optimization, all data on the dedicated bearer is sent to the wireless side network element through the bound S1-U or S12 bearer.

The routing optimization system of the present invention is realized on the basis of the existing network, and it only upgrades the functions of some network elements accordingly, but the network structure is not improved. Therefore, it can refer to the aforementioned routing optimization method and that shown in Figure 13 The relevant description of the service gateway can be understood. Since the wireless side network elements and improved related network elements are described in detail above, the details of related network elements and their functions in the routing optimization system will not be repeated here. The relevant network structure of the routing optimization system of the present invention can be understood with reference to the relevant network structure of the foregoing FIGS. 1 to 4 .

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (21)

1. a kind of routing optimization method, which is characterized in that the method is located at the net under same services gateway for communicating pair In network, the method includes：

Gateway executes routing optimality judgement according to acquired routing optimality judgement information, and is being judged to be route When optimization, the foundation in routing optimality channel between the communicating pair is executed；

The routing optimality judgement information includes the signing information of routing optimality and/or the data policy of routing optimality, Yi Jiyong In the information for determining communicating pair position relationship；Wherein, the information of the communicating pair position relationship includes being taken for gateway The topological structure of the base station of business；

It is corresponding, it is described to be judged to that routing optimality is carried out, be：

The signing information of the routing optimality of the communicating pair and/or the data policy of routing optimality allow routing optimality, and The gateway judges that the base station that the communicating pair is located at is according to the topological structure of the base station by serving gateway service It is no adjacent as a result, come the routing optimality that is determined as between communicating pair executes the base station that is located at of communicating pair, be still responsible for The routing optimality of communicating pair forwarding；Wherein, it when the base station that judgement communicating pair is located at is adjacent, executes communicating pair and is located at Base station between routing optimality；When judging that the base station that the communicating pair is located at is non-conterminous, it is responsible for communicating pair forwarding Routing optimality.

2. according to the method described in claim 1, it is characterized in that, obtaining the signing information and/or routing optimality of routing optimality Policy information, be：

Mobility management unit is when creating session or changing existing carrying by the road received by the subscription data server The gateway is sent to by the policy information of the signing information and/or routing optimality that optimize；

Alternatively, configuration network element in network is by the signing information of the routing optimality of communication party and/or the policy information of routing optimality It is configured in gateway as configuration information；

Alternatively, anchor gateway is initiated to create with the IP connected reference network IP-CAN sessions of strategy and charging regulation function entity PCRF During building or changing, the signing information of the routing optimality of communication party and/or the strategy letter of routing optimality are obtained from the PCRF Breath, and it is transmitted to the gateway；

Alternatively, when PCRF actively initiates carrying foundation or bearing modification, by the signing information of the routing optimality of communication party and/or road Anchor gateway is sent to by the policy information optimized, the anchor gateway is by the signing information of the routing optimality and/or routing The policy information of optimization is sent to gateway.

3. according to the method described in claim 1, it is characterized in that, obtain information for determining communicating pair position relationship, For：

Anchor gateway is initiated, with during the IP-CAN conversation establishings of PCRF or modification, PCRF in IP-CAN session establishments or to be repaiied Transmission stream template TFT used in the IP-CAN sessions or carrying is specified to be transmitted to gateway in journey of correcting one's mistakes；The clothes Business gateway obtains the IP address for having adhered to communication party from the TFT；

Alternatively, when PCRF actively initiates carrying foundation or bearing modification, it will be specified during IP-CAN conversation establishings or modification IP-CAN sessions or carrying used in TFT notify anchor gateway, the TFT is transmitted to service network by the anchor gateway It closes；The gateway obtains the IP address for having adhered to communication party from the TFT；

Alternatively, gateway parses the IP address for having adhered to communication party from received data packet packet header；

Alternatively, anchor gateway is attached by IP address assigning process or monitoring DynamicHost setting Protocol DHCP messages process acquisition After the IP address of communication party, notify to gateway.

4. according to the method described in claim 1, it is characterized in that, obtain information for determining communicating pair position relationship, For：

Configuration network element will be that the cell site topology information of serving gateway service is sent to the gateway；

Alternatively, gateway initiates the inquiry request to the DNS of communicating pair, the DNS service to domain name system DNS server Position relationship of the device according to the inquiry of the wireless network topology structure of preservation between the base station of communicating pair service, and described in notice Gateway.

5. method according to any one of claims 1 to 4, which is characterized in that the communicating pair shares a service network It closes, share an anchor gateway or divides with different anchor gateways.

6. according to the method described in claim 5, it is characterized in that, the foundation for executing routing optimality channel, is：

Communicating pair establishes routing channel without core net by gateway；

Alternatively, communicating pair establishes routing channel without core net by wireless side network element.

7. according to the method described in claim 5, it is characterized in that, the method further includes：

The gateway determines that communicating pair without core net and when establishing routing channel by wireless side network element, will be obtained The wireless side network element address of the TFT, the routing optimality strategy and communication counterpart ownership formulated that take pass through mobile management list Member is sent to the wireless side network element of communication one side attachment；

Routing optimality channel is established by opposite end address between the wireless side network element that communicating pair respectively adheres to；

When wireless side network element receives the data that non-core net is sent, Data Matching is wirelessly held to corresponding according to the TFT In load or by the dedicated bearer of Data Matching to communicating pair, and when receiving the data of communication party's transmission, according to road It is determined through core network by strategy by still being route by routing optimality channel.

8. according to the method described in claim 5, it is characterized in that, the method further includes：

The gateway determines communicating pair without core net and when establishing routing channel by gateway, it would be desirable to road By TFT being matched in corresponding S1-U or S12 carryings or be matched to PCRF by the data that optimize, to be that communicating pair determines special With in carrying, for the data of non-local routing be sent to core it is net loaded on, route by core net, for needing to route The data of optimization are encapsulated into the wireless side network element that communication party's attachment is sent in corresponding S1-U or S12 carryings, and then are sent to Communication counterpart.

9. according to the method described in claim 5, it is characterized in that, the method further includes：

PCRF is that communicating pair establishes the transmission of dedicated bearer or specified certain carrying for communicating pair route optimized data；

The gateway determines that communicating pair without core net and when establishing routing channel by wireless side network element, will carry The wireless side network element address that type, routing optimality strategy, carrying label and communication counterpart belong to passes through mobility management unit It is sent to the wireless side network element of communication one side attachment；

Wireless side network element often carries matched routing optimality channel according to carrying label foundation；For being exclusively used in holding for routing optimality Data in load are judged according to routing policy, if data are suitble to routing optimality, by often carrying tunnel between wireless side network element Road is transmitted, if data are not suitable for routing optimality, is encapsulated data into core net relevant bearer；Or without using routing Strategy, all data that will be specific on routing optimization bearing between wireless side network element per bearing tunnel by being transmitted.

10. according to the method described in claim 5, it is characterized in that, the method further includes：

PCRF is that communicating pair establishes the transmission of dedicated bearer or specified certain carrying for communicating pair route optimized data；

The gateway determines communicating pair without core net and when establishing routing channel by gateway, according to routing Source address, destination address, service quality QoS grade or the bearing mark for optimizing the belonged to carrying of data will be that communicating pair is mutual Lead to established dedicated bearer to be bound, gateway determines which kind of data executes routing optimality according to routing policy, need to The data of routing optimality are sent to wireless side network element by S1-U or the S12 carrying of binding；Or do not execute routing optimality, it will be special Wireless side network element is sent to by S1-U or the S12 carrying of binding with carrying upper all data.

11. according to the method described in claim 5, it is characterized in that, wireless side network element includes：Evolution base station, base station controller, Home eNodeB, home evolved node B, femto gateway；

The anchor gateway includes packet data gateway P-GW, Gateway GPRS Support Node GGSN.

12. a kind of gateway, which is characterized in that the gateway includes acquiring unit, judging unit and execution unit, In：

Acquiring unit judges information for obtaining routing optimality；

Judging unit, for judging that the routing optimality between information execution communicating pair judges according to the routing optimality, and When being judged to carry out routing optimality, execution unit is triggered；The communicating pair is located under same services gateway；

Execution unit, the foundation for executing routing optimality channel between the communicating pair；

The routing optimality judgement information includes the signing information of routing optimality and/or the data policy of routing optimality, Yi Jiyong In the information for determining communicating pair position relationship；Wherein, the information of the communicating pair position relationship includes being taken for gateway The cell site topology structure of business；

Accordingly, the judging unit is additionally operable to, and determines that the signing information of the routing optimality of the communicating pair and/or routing are excellent The data policy of change allows routing optimality, and the gateway is sentenced according to the topological structure of the base station for serving gateway service Whether the base station that the fixed communicating pair is located at is adjacent as a result, to be determined as that communicating pair executes what communicating pair was located at Routing optimality between base station is still responsible for the routing optimality of communicating pair forwarding；Wherein, the base that judgement communicating pair is located at When standing adjacent, the routing optimality between the base station that communicating pair is located at is executed；Judge base station that the communicating pair is located at not When adjacent, it is responsible for the routing optimality of communicating pair forwarding.

13. a kind of route optimization system, including gateway, mobility management unit, anchor gateway, subscription data server, PCRF, wireless side network element and communication party；It is characterized in that, the gateway is used for, judged according to acquired routing optimality Information executes the routing optimality judgement between communicating pair, and when being judged to that routing optimality can be carried out, and it is double to execute the communication The foundation in routing optimality channel between side；The communicating pair is located under same services gateway；

The routing optimality judgement information includes the signing information of routing optimality and/or the data policy of routing optimality, Yi Jiyong In the information for determining communicating pair position relationship；Wherein, the information of the communicating pair position relationship includes being taken for gateway The cell site topology structure of business；

Accordingly, the gateway is additionally operable to, and determines that the signing information of the routing optimality of the communicating pair and/or routing are excellent The data policy of change allows routing optimality, and the gateway is sentenced according to the topological structure of the base station for serving gateway service Whether the base station that the fixed communicating pair is located at is adjacent as a result, to be determined as that communicating pair executes what communicating pair was located at Routing optimality between base station is still responsible for the routing optimality of communicating pair forwarding；Wherein, the base that judgement communicating pair is located at When standing adjacent, the routing optimality between the base station that communicating pair is located at is executed；Judge base station that the communicating pair is located at not When adjacent, it is responsible for the routing optimality of communicating pair forwarding.

14. system according to claim 13, which is characterized in that the gateway obtains the signing information of routing optimality And/or the policy information of routing optimality, it is：

Mobility management unit is when creating session or changing existing carrying by the road received by the subscription data server The gateway is sent to by the policy information of the signing information and/or routing optimality that optimize；

Alternatively, configuration network element in network is by the signing information of the routing optimality of communication party and/or the policy information of routing optimality It is configured in gateway as configuration information；

Alternatively, anchor gateway is initiated to create with the IP connected reference network IP-CAN sessions of strategy and charging regulation function entity PCRF During building or changing, the signing information of the routing optimality of communication party and/or the strategy letter of routing optimality are obtained from the PCRF Breath, and it is transmitted to the gateway；

Alternatively, when PCRF actively initiates carrying foundation or bearing modification, by the signing information of the routing optimality of communication party and/or road Anchor gateway is sent to by the policy information optimized, the anchor gateway is by the signing information of the routing optimality and/or routing The policy information of optimization is sent to gateway.

15. system according to claim 13, which is characterized in that the gateway is obtained for determining communicating pair position The information for setting relationship is：

Anchor gateway is initiated during creating or change with the IP connected reference network IP-CAN sessions of PCRF, by PCRF in IP- Transmission stream template TFT used in the IP-CAN sessions or carrying is specified to be transmitted to during CAN session establishments or modification Gateway；The gateway obtains the IP address for having adhered to communication party from the TFT；

Alternatively, when PCRF actively initiates carrying foundation or bearing modification, it will be specified during IP-CAN conversation establishings or modification IP-CAN sessions or carrying used in TFT notify anchor gateway, the TFT is transmitted to service network by the anchor gateway It closes；The gateway obtains the IP address for having adhered to communication party from the TFT；

Alternatively, gateway parses the IP address for having adhered to communication party from received data packet packet header；

Alternatively, anchor gateway is attached by IP address assigning process or monitoring DynamicHost setting Protocol DHCP messages process acquisition After the IP address of communication party, notify to gateway.

16. system according to claim 13, which is characterized in that the gateway is obtained for determining communicating pair position The information for setting relationship is：

Configuration network element will be that the cell site topology information of serving gateway service is sent to the gateway；

Alternatively, gateway initiates the inquiry request to the DNS of communicating pair, the DNS service to domain name system DNS server Position relationship of the device according to the inquiry of the wireless network topology structure of preservation between the base station of communicating pair service, and described in notice Gateway.

17. according to claim 13 to 16 any one of them system, which is characterized in that the gateway is additionally operable to, and makes to lead to Letter both sides establish routing channel without core net by gateway；

Alternatively, communicating pair is made to establish routing channel by wireless side network element without core net.

18. system according to claim 17, it is characterised in that：

The gateway is additionally operable to, and determines that communicating pair establishes routing channel without core net by wireless side network element When, the wireless side network element address that acquired TFT, the routing optimality strategy formulated and communication counterpart belong to is passed through into movement Property administrative unit be sent to communication one side attachment wireless side network element；

Routing optimality channel is established by opposite end address between the wireless side network element that communicating pair respectively adheres to；

Wireless side network element is used for, when receiving the data that non-core net is sent, according to the TFT by Data Matching to corresponding nothing Line carrying is upper or by the dedicated bearer of Data Matching to communicating pair, and when receiving the data of communication party's transmission, root It is determined through core network according to routing policy by still being route by routing optimality channel.

19. system according to claim 17, it is characterised in that：

The gateway is additionally operable to, and determines communicating pair without core net and when establishing routing channel by gateway, It is communicating pair to be matched in corresponding S1-U or S12 carryings or be matched to PCRF by TFT by the data for needing routing optimality On determining dedicated bearer, for the data of non-local routing be sent to core it is net loaded on, route by core net, it is right In need the data of routing optimality be encapsulated into be sent in corresponding S1-U or S12 carryings communication party attachment wireless side network element, into And it is sent to communication counterpart.

20. system according to claim 17, it is characterised in that：

PCRF is used for, and the biography of dedicated bearer or specified certain carrying for communicating pair route optimized data is established for communicating pair It is defeated；

The gateway is additionally operable to, and determines that communicating pair establishes routing channel without core net by wireless side network element When, the wireless side network element address of bearer types, routing optimality strategy, carrying label and communication counterpart ownership is passed through into mobility Administrative unit is sent to the wireless side network element of communication one side attachment；

Wireless side network element is used for, and matched routing optimality channel is often carried according to carrying label foundation；It is excellent for being exclusively used in routeing Data in the carrying of change are judged according to routing policy, if data are suitble to routing optimality, by every between wireless side network element Bearing tunnel is transmitted, if data are not suitable for routing optimality, is encapsulated data into core net relevant bearer；Or do not make With routing policy, all data that will be specific on routing optimization bearing between wireless side network element per bearing tunnel by being passed It passs.

21. system according to claim 17, it is characterised in that：

PCRF is used for, and the biography of dedicated bearer or specified certain carrying for communicating pair route optimized data is established for communicating pair It is defeated；

The gateway is additionally operable to, and determines communicating pair without core net and when establishing routing channel by gateway, To be logical according to the source address of the belonged to carrying of route optimized data, destination address, service quality QoS grade or bearing mark The dedicated bearer that letter both sides' intercommunication is established is bound, and gateway determines which kind of data execution routing is excellent according to routing policy Change, the data for needing routing optimality are sent to wireless side network element by S1-U or the S12 carrying of binding；Or do not execute will route it is excellent Change, all data on dedicated bearer are sent to wireless side network element by S1-U or the S12 carrying of binding.