CN101621787A - Method and system for transferring context information and access service network - Google Patents

Abstract

The embodiment of the invention discloses a method, a system and an access service network for context information migration. The method includes receiving a first handover message from a gateway mobile station G-MS; sending a second handover message to a target access service network ASN, and the second handover message carries context information of the G-MS and information of the host Host contextual information. The embodiment of the present invention also provides a context information migration system and an access service network. The embodiment of the present invention reduces the overhead of signaling by transmitting the context information of the G-MS and the context information of the Host to the target ASN in one signaling when the G-MS is switched.

Description

Method, system and access service network for context information migration

technical field

The present invention relates to the field of communication technology, in particular to a method, system and access service network for context information migration.

Background technique

The current multi-host WiMAX (Worldwide Interoperability for Microwave Access) network system architecture diagram is shown in Figure 1. The host (Host) communicates with the G-MS (Gateway Mobile Station) through 802.3/802.11/802.16 , gateway mobile station) communication, G-MS is connected to ASN (Access Service Network, access service network) and BS (BaseStation, base station) of NAP (Network Access Provider, network access provider) through the R1 interface of WiMAX The interface is R8 interface, the interface between ASN GW (Access service Network Gateway, access service network gateway) is R4 interface, the interface between BS and ASN GW is R6 interface, ASN GW and network service provider NSP (Network Service Provider) The interface between the connection service network CSN (Connectivity Service Network) is the R3 interface.

Among them, Host is a user terminal; G-MS is a device with WiMAX wireless air interface access capability. It can be a network side device or a user side device, and can share WiMAX wireless air interface access for multiple Hosts; Host can pass G-MS accesses the WiMAX network. The Host is also a WiMAX network subscriber, and the WiMAX network needs to manage the G-MS back-end Host and provide network services for the Host. The connection technology between the Host and the G-MS may be a wired technology, such as 802.3, or a wireless connection, such as 802.11 or 802.16.

In the process of carrying out the present invention, the inventor found that there are at least the following problems in the prior art: in some application scenarios of multi-host systems, such as the scenario where G-MS moves in trains or cars, all Hosts will be accompanied by G-MS Moving together, in the handover process caused by the movement of all Hosts accompanied by G-MS, it is necessary to transmit the context information of G-MS and all Hosts to the new target access service network through multiple signalings, resulting in excessive signaling overhead .

Contents of the invention

The technical problem to be solved by the embodiments of the present invention is to provide a context information migration method, system and access service network to solve the problem of excessive signaling overhead for transferring G-MS and Host context information in the prior art.

An embodiment of the present invention provides a method for migrating context information, including: receiving a first handover message from a gateway mobile station G-MS; sending a second handover message to a target access service network ASN, in the second handover message It carries the context information of the G-MS and the context information of the host.

The embodiment of the present invention also provides a method for migrating context information, including: receiving a ranging request message from the G-MS; sending a context request message to the serving ASN; receiving a context report message from the serving ASN, the context report message carrying There are context information of G-MS and context information of host Host.

An embodiment of the present invention provides an access service network, including a receiving unit and a sending unit; the receiving unit is configured to receive a first handover message from a G-MS, and the first handover message is a mobile station handover request message or a mobile station handover instruction message; the sending unit is configured to send a second handover message to the target ASN, the second handover message carries context information of the G-MS and context information of the Host, if the first handover The message is a mobile station handover request message, and the second handover message is a handover request message; if the first handover message is a mobile station handover instruction message, the second handover message is a handover confirmation message.

The embodiment of the present invention also provides an access service network, including a first receiving unit, a sending unit, and a second receiving unit; the first receiving unit is configured to receive a ranging request from a G-MS; the sending The unit is configured to send a context request message to the serving ASN; the second receiving unit is configured to receive a context report message from the serving ASN, and the context report message carries the context information of the G-MS and the context information of the Host.

An embodiment of the present invention provides a system for migrating context information, including a serving ASN and a target ASN; the serving ASN is used to receive a first handover message from a G-MS, and the first handover message is a mobile station handover request message or a mobile station handover indication message; sending a second handover message to the target ASN, the second handover message carrying the context information of the G-MS and the context information of the host Host, if the first handover message is a mobile station A handover request message, the second handover message is a handover request message; if the first handover message is a mobile station handover instruction message, the second handover message is a handover confirmation message; the target ASN is used to receive the service The second handover message sent by the ASN.

An embodiment of the present invention also provides a system for context information migration, including: a serving ASN and a target ASN, the target ASN is used to receive a ranging request message from a G-MS, and send a context request message to the serving ASN; The serving ASN is configured to receive a context request message from the target ASN, and send a context report message to the target ASN, where the context report message carries context information of the G-MS and context information of the host Host; The target ASN is also used to receive a context report message from the serving ASN.

It can be seen that the embodiment of the present invention conveniently transmits the context information of the G-MS and the context information of the Host to the target ASN through one signaling when the G-MS is handed over, thereby reducing signaling overhead.

Description of drawings

Figure 1 is a multi-host WiMAX network system architecture diagram;

FIG. 2 is a flowchart of a method for migrating context information provided by Embodiment 1 of the present invention;

FIG. 3 is a flowchart of a method for migrating context information provided in Embodiment 2 of the present invention;

FIG. 4 is a flowchart of a method for migrating context information provided in Embodiment 3 of the present invention;

FIG. 5 is a schematic structural diagram of an access service network device provided by an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an access service network device provided by an embodiment of the present invention.

Detailed ways

The embodiment of the invention discloses a context information migration method, system and access service network.

The context information migration method provided by the embodiment of the present invention includes: receiving a first handover message from the G-MS; sending a second handover message to the target access service network ASN, the second handover message carrying the G-MS Context information and context information of the host Host.

In the embodiment of the present invention, the overhead of signaling is reduced by transmitting the context information of the G-MS and the context information of the Host to the target ASN at the same time when the G-MS is handed over.

Wherein the context information of the Host in the above embodiment may include: the identifier of the authenticator of the Host, the identifier of the anchor access service network gateway (Anchor ASN GW ID), service flow information and anchor mobility management context.

The embodiment of the present invention further includes: the first handover message is a mobile station handover request message, and the second handover message is a handover request message; or the first handover message is a mobile station handover instruction message, and the second handover message is a handover confirmation message.

If the context information of the G-MS and the context information of the Host carried in the second handover message received by the target ASN are available, initiate a data channel pre-establishment process with the anchor access service network, and use the data channel pre-establishment process in the data channel pre-establishment process Describe the context information of the Host

Embodiments of the present invention further include:

If the context information of the G-MS and the context information of the Host carried in the second handover message received by the target ASN are available, initiate a data channel establishment process with the anchor access service network, and use the Host in the data channel establishment process contextual information.

The embodiment of the present invention also provides a method for migrating context information, including:

Receive a ranging request message from the G-MS;

Send a context request message to the service ASN;

Receive a context report message from the service ASN, where the context report message carries the context information of the G-MS and the context information of the host.

In the embodiment of the present invention, the overhead of signaling is reduced by transmitting the context information of the G-MS and the context information of the Host to the target ASN at the same time when the G-MS is handed over.

The specific implementation manners of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

FIG. 2 is a flowchart of a method for migrating context information provided by Embodiment 1 of the present invention. In this embodiment, when the G-MS enters the handover preparation phase, the context information of the G-MS and the Host are simultaneously delivered to the target ASN and then to the anchor ASN at the time of the handover request.

Step 201, the G-MS sends a mobile station handover request (MOB_MSHO-REQ) message to the Serving ASN (Serving ASN) to initiate the handover process, and the message may contain one target base station or multiple target base stations.

Step 202, the serving ASN sends the R4 HO_Req (handover request) message to the target ASN (TargetASN), which contains context information and Host context information of the G-MS, wherein the context information of the G-MS can include: the context information of the G-MS Authenticator ID (Authenticator ID) and G-MS Anchor ASN Gateway ID (Anchor ASN-GW ID); Host context information may include: Host Authenticator ID, Anchor ASN GW ID, service flow information SFinfo , anchoring the mobility management context Anchor MM (Mobility Management) Context.

In order to realize the migration of context information, one or more Host Info TLVs can be added in the G-MS Info TLV (Type Length Value, type length content) of the HO_Req message, and its definition can be shown in Table 1. Host Info can include such as Table 2 shows.

Table 1

IE M/O notes HO Type m G-MS Info m ＞Host Info o One or more BS Info(Serving) m BS Info (Target, one or more) m Relative Delay，DL/UL PHY Quality Info as viewed by MS

AK Context o MAY be included if the Serving ASN retrieves the AK Context for the Target ASN from the Authenticator ASN.If not included the Target ASN SHALL retrieve AKcontext.

Table 2

Step 203, the target ASN obtains the authorization key context of the G-MS through the context request process with the G-MS authentication ASN (G-MS Authenticator ASN), if the authenticator of the G-MS is not included in the R4 handover request message ID (at this time, the service ASN can be used as the G-MSAuthenticator ASN), and the target ASN initiates the context request process with the service ASN.

Step 204, the target ASN obtains the authorization key context of the Host through the context request process with the Host Authenticator ASN (Host Authenticator ASN). AuthenticatorASN), the target ASN initiates the context request process with the service ASN.

Step 205, if the context information of the G-MS obtained by the target ASN, the context information of the Host, the authorization key context information of the G-MS and the authorization key context information of the Host are available, then the target ASN can initiate and anchor the ASN (Anchor ASN) ASN) between the G-MS and the associated Host data channel pre-establishment process, the context information of the Host is used in the data channel pre-establishment process.

Specifically, it can be a message during the pre-establishment process of the data channel: Path_Reg_Req (data channel registration request), Path_Reg_Rsp (data channel registration response), Path_PreReg_Req (data channel pre-registration request) or Path_PreReg_Rsp (data channel pre-registration response). The definition is similar to the expansion method in the HO_Req message, and will not be repeated here.

Step 206, the target ASN sends an R4 HO_Rsp (handover response) message to the serving ASN to respond to the handover request.

Step 207: After receiving the R4 HO_Rsp message, the serving ASN sends a base station handover response (MOB_BSHO-RSP) message to the G-MS, which may contain one or more switchable target base stations of the network selected by the G-MS.

Step 208, the serving ASN sends an R4 HO_Ack (handover acknowledgment) message to the target ASN.

In the above embodiment, during the G-MS handover preparation stage, the G-MS context information and Host context information are simultaneously delivered to relevant entities on the network side, so when the G-MS moves, the target ASN simultaneously obtains the G-MS context Information and Host context information, and establish a new air interface connection and data channel, reducing signaling overhead.

The Host context information can be included in the G-MS context information and transmitted to the target ASN, so that the target ASN can obtain the relevant information of the Host from the authenticator, establish a new air interface connection and data channel, and reduce signaling overhead.

FIG. 3 is a flowchart of a method for migrating context information provided in Embodiment 2 of the present invention. In this embodiment, when the G-MS enters the handover implementation phase, the serving ASN sends an acknowledgment message containing the G-MS context information and the Host context information to the target ASN and then to the anchor ASN.

Step 301. The G-MS sends a MOB_HO_IND (Mobile Station Handover Indication) message to the serving ASN to initiate a handover process, and the message includes the target base station identifier.

Step 302. The serving ASN sends an R4 HO_Cnf (handover confirmation) message to the target ASN, and the message includes the context information of the G-MS and the context information of the Host. The context information of the G-MS may include: Authenticator ID of the G-MS and the anchor ASN gateway identifier of the G-MS; the context information of the Host may include: Authenticator ID of the Host, Anchor ASN GWID, SF info, and Anchor MM Context.

In order to realize the migration of context information, one or more Host Info TLVs can be added to the G-MS Info TLV of the HO_Cnf message. The definition can be shown in Table 3, and the Host Info can be included as shown in Table 4.

table 3

IE M/O Notes HOType m G-MS Info m ＞Host Infp o One or more B S Info(Serving) m BS Info(Target, one or more) m Relative Delay，DL/UL PHY Quality Info asviewed by G-MS AK Context o MAY be included if the Serving ASN retrieves the AK Context for the Target ASN from the Authenticator ASN.If not included the Target ASN SHALL retrieve AK context.

Table 4

Step 303. The target ASN sends a HO_Ack (handover response) message to the Serving ASN.

Step 304. The target ASN obtains the authorization key context of the G-MS through the context request process with the G-MS Authenticator ASN. If the HO_Cnf message does not contain the authenticator identifier of the G-MS (at this time, the serving ASN can be used as the G-MS MS Authenticator ASN), the target ASN initiates the context request process with the service ASN.

Step 305. The target ASN obtains the authorization key context of the Host through the context request process with the Host Authenticator ASN. If the switch request message does not contain the authenticator ID of the Host (at this time, the service ASN can be used as the Host Authenticator ASN), the target ASN Initiates the context request process with the service ASN.

Step 306. If the context information of the G-MS, the context information of the Host, the authorization key context information of the G-MS and the authorization key context information of the Host acquired by the target ASN are available, the target ASN can initiate the communication with the Anchor ASN. The pre-establishment process of the data channel between the G-MS and its Host, which uses the context information of the Host during the pre-establishment process of the data channel.

Specifically, it can be a message during the pre-establishment process of the data channel: the definition of the added fields in Path_Reg_Req, Path_Reg_Rsp, Path_PreReg_Req or Path_PreReg_Rsp is similar to the expansion method in the HO_Cnf message, and will not be repeated here.

Step 307. The G-MS moves to the target ASN and initiates a re-entry process.

Step 308. The target ASN initiates the process of establishing a data channel between the G-MS and the Host with the Anchor ASN.

Step 309. The target ASN initiates a CMACKey Count (cipher-based message authentication code Key Count, ciphertext-based message authentication code key counter) update process between the G-MS Authenticator ASN and the G-MS Authenticator ASN.

Step 310. The target ASN initiates an optional update process of CMAC KeyCount with the Host Authenticator ASN.

Step 311. The target ASN sends an R4 HO_Complete (handover complete) message to the serving ASN to indicate that the handover is complete.

In the above embodiments, when the G-MS enters the handover implementation stage, the context information of the G-MS and the context information of the Host are simultaneously delivered to the relevant entities on the network side, so when the G-MS moves, the target ASN simultaneously obtains the context information of the G-MS Information and Host context information, and establish a new air interface connection and data channel, reducing signaling overhead.

FIG. 4 is a flowchart of a method for migrating context information provided by Embodiment 3 of the present invention. In this embodiment, when the G-MS is not fully controlling the handover process, the serving ASN simultaneously obtains the context information of the G-MS and the context information of the Host to the target ASN through the process of context request, and completes the handover of the G-MS.

Step 401. The G-MS sends a RNG-REQ (ranging request) message to the target ASN to initiate a handover process, and the message includes the identity of the serving base station.

Step 402. The target ASN sends a Context_req (context request) message to the serving ASN.

Step 403. The serving ASN returns a context_report (context report) message to the target ASN, and the message includes the context information of the G-MS and the context information of the Host. The context information of G-MS can include: Authenticator ID of G-MS and the anchor ASN gateway identifier of G-MS; the context information of Host can include: Authenticator ID of Host, AnchorASN GW ID, SF info, Anchor MM Context, etc. .

In order to realize the migration of context information, add one or more Host Info TLVs to the G-MS Info TLV of the context_report message:

IE M/O Notes

HO Type m G-MS Info m ＞Host Info o One or more BS Info(Serving) m BS Info(Target, one or more) m Relative Delay，DL/UL PHY Quality Infoas viewed by MS AK Context o MAY be included if the Serving ASN retrieves the AK Context for the TargetASN from the Authenticator ASN.If not included the Target ASN SHALLretrieve AK context.

Among them, Host Info includes:

Step 404. The target ASN obtains the authorization key context of the G-MS through the context request process with the G-MS Authenticator ASN. If the context_report message does not contain the authenticator identifier of the G-MS (at this time, the service ASN can be used as the G-MS MS Authenticator ASN), the target ASN initiates the context request process with the service ASN.

Step 405. The target ASN obtains the authorization key context of the Host through the context request process with the Host Authenticator ASN. If the context_report message does not contain the authenticator ID of the Host (at this time, the service ASN can be used as the Host Authenticator ASN), the target ASN initiates Context request process with service ASN.

Step 406. If the context information of the G-MS obtained by the target ASN and the context information of the Host are available, the target ASN initiates a process of establishing a data channel between the G-MS and the Host with the Anchor ASN, and the data channel is pre-established using the Host contextual information.

Step 407. The target ASN sends a RNG-RSP (Ranging Response) message to the serving ASN.

Step 408. The target ASN initiates the CMACKey Count update process with the G-MS Authenticator ASN.

Step 409. The target ASN initiates an optional update process of the CMACKey Count with the Host Authenticator ASN.

Step 410. The Anchor ASN initiates a data channel deregistration process with the service ASN.

In the above embodiment, when the G-MS does not completely control the handover process, the serving ASN transmits the context information of the G-MS and the host context information to the relevant entities on the network side at the same time, so when the G-MS moves, the target ASN can obtain the G-MS context information and Host context information information, and establish a new air interface connection and data channel, reducing signaling overhead.

An embodiment of the present invention provides an access service network, as shown in FIG. 5 , including a receiving unit 501 and a sending unit 502;

The receiving unit 501 is configured to receive a first handover message from the G-MS, where the first handover message is a mobile station handover request message or a mobile station handover instruction message;

The sending unit 502 is configured to send a second handover message to the target ASN, where the second handover message carries the context information of the G-MS and the context information of the Host, and if the first handover message is a mobile station handover request message, the second The handover message is a handover request message; if the first handover message is a mobile station handover instruction message, the second handover message is a handover confirmation message.

The embodiment of the present invention also provides an access service network, as shown in FIG. 6 , including a first receiving unit 601, a sending unit 602, and a second receiving unit 603;

The first receiving unit 601 is configured to receive a ranging request from a G-MS;

A sending unit 602, configured to send a context request message to the serving ASN;

The second receiving unit 603 is configured to receive a context report message from the serving ASN, where the context report message carries the context information of the G-MS and the context information of the Host.

The access service network provided by the embodiment of the present invention may further include a judgment unit 604 and an execution unit 605;

The judging unit 604 is configured to judge whether the context information of the G-MS and the context information of the Host carried in the context report message are available;

The executing unit 605 is configured to initiate a data channel establishment process with the anchor access service network if the judging unit 604 judges that the context information of the G-MS and the context information of the Host carried in the context report message are available, and the data channel establishment process uses Host context information.

An embodiment of the present invention provides a context information migration system, including a service ASN and a target ASN;

The serving ASN is used to receive a first handover message from the G-MS, the first handover message is a mobile station handover request message or a mobile station handover instruction message; send a second handover message to the target ASN, and the second handover message carries G - The context information of the MS and the context information of the host Host, if the first handover message is a mobile station handover request message, the second handover message is a handover request message; if the first handover message is a mobile station handover instruction message, the second handover message is Toggle confirmation message;

The target ASN is used to receive the second handover message sent by the serving ASN.

The context information of the above-mentioned Host includes: the identifier of the authenticator of the Host, Anchor ASN GW ID, service flow information and anchor mobility management context.

A context information migration system provided by an embodiment of the present invention further includes an anchor access service network;

If the context information of the G-MS and the context information of the Host carried in the second handover message received by the target ASN are available, the target ASN initiates a data channel pre-establishment process with the anchor access service network, and uses The context information of the Host;

If the first handover message is a mobile station handover indication message, and if the context information of the G-MS and the context information of the Host carried in the second handover message received by the target ASN are available, the target ASN initiates a data transfer with the anchor access service network In the channel establishment process, the context information of the Host is used in the data channel establishment process.

The embodiment of the present invention also provides a context information migration system, including a service ASN and a target ASN;

The target ASN is used to receive the ranging request message from the G-MS, and send the context request message to the serving ASN;

The serving ASN is used to receive the context request message from the target ASN, and send the context report message to the target ASN, the context report message carries the context information of the G-MS and the context information of the host Host;

The target ASN is used to receive the context report message from the serving ASN.

The context information migration system provided by the above embodiments further includes an anchor access service network;

If the context information of the G-MS and the context information of the Host carried in the context report message received by the target ASN are available, the target ASN initiates a data channel establishment process with the anchor access service network, and uses the Describe the context information of the Host.

In the context information migration method provided by the embodiment of the present invention, the system and the access service network send the context information of the G-MS and the context information of the Host to the target ASN through a signaling through the serving ASN when the G-MS is handed over , reducing signaling overhead.

Those of ordinary skill in the art can understand that all or part of the steps in the method of the above-mentioned embodiments can be completed by instructing related hardware through a program. The program can be stored in a computer-readable storage medium, and the program can be executed when executed , including the following steps:

receiving a first handover message from the gateway mobile station G-MS;

Sending a second handover message to the target access service network ASN, where the second handover message carries the context information of the G-MS and the context information of the host.

The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, and the like.

The above mentioned preferred embodiments have further described the purpose, technical solutions and advantages of the present invention in detail. It should be understood that the above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Within the spirit and principles of the present invention, any modifications, equivalent replacements, improvements, etc., shall be included within the protection scope of the present invention.

Claims (16)

1. A method for context information migration, comprising: receiving a first handover message from the gateway mobile station G-MS; Sending a second handover message to the target access service network ASN, where the second handover message carries the context information of the G-MS and the context information of the host. 2. The method according to claim 1, wherein the context information of the host Host includes: Host authenticator identifier, anchor access service network gateway identifier, service flow information and anchor mobility management context. 3. The method of claim 1, wherein: The first handover message is a mobile station handover request message, and the second handover message is a handover request message. 4. The method of claim 1, wherein: The first handover message is a mobile station handover indication message, and the second handover message is a handover confirmation message. 5. The method according to claim 3 or 4, characterized in that the method further comprises: If the context information of the G-MS and the context information of the Host carried in the second handover message received by the target ASN are available, the target ASN initiates a data channel pre-establishment process with the anchor access service network, the The context information of the Host is used in the data channel pre-establishment process. 6. The method of claim 4, further comprising: If the context information of the G-MS and the context information of the Host carried in the second handover message received by the target ASN are available, the target ASN initiates a process of establishing a data channel with the anchor access service network, and the data The context information of the Host is used during channel establishment. 7. A method for migrating context information, comprising: Receive a ranging request message from the G-MS; Send a context request message to the service ASN; Receive a context report message from the serving ASN, where the context report message carries the context information of the G-MS and the context information of the host. 8. The method according to claim 7, characterized in that said method further comprises: If the context information of the G-MS and the context information of the Host carried in the context report message received by the target ASN are available, the target ASN initiates a data channel establishment process with the anchor access service network, and the data channel establishment process Use the context information of the Host in the 9. An access service network, characterized by comprising a receiving unit and a sending unit; The receiving unit is configured to receive a first handover message from the G-MS, where the first handover message is a mobile station handover request message or a mobile station handover instruction message; The sending unit is configured to send a second handover message to the target ASN, where the second handover message carries the context information of the G-MS and the context information of the Host, if the first handover message is a mobile station handover request message , the second handover message is a handover request message; if the first handover message is a mobile station handover instruction message, the second handover message is a handover confirmation message. 10. An access service network, characterized by comprising a first receiving unit, a sending unit, and a second receiving unit; the first receiving unit is configured to receive a ranging request from a G-MS; The sending unit is configured to send a context request message to the serving ASN; The second receiving unit is configured to receive a context report message from the serving ASN, where the context report message carries the context information of the G-MS and the context information of the Host. 11. The access service network according to claim 10, further comprising a judgment unit and an execution unit, The judging unit is used to judge whether the context information of the G-MS and the context information of the Host carried in the context report message are available; The executing unit is configured to initiate a data channel establishment process with the anchor access service network if the judging unit judges that the context information of the G-MS and the context information of the Host carried in the context report message are available, and the data The context information of the Host is used during channel establishment. 12. A system for migrating context information, comprising a service ASN and a target ASN; The serving ASN is used to receive a first handover message from the G-MS, the first handover message is a mobile station handover request message or a mobile station handover instruction message; send a second handover message to the target ASN, the first handover message is The context information of the G-MS and the context information of the host Host are carried in the second handover message, if the first handover message is a mobile station handover request message, the second handover message is a handover request message; if the first handover The message is a mobile station handover indication message, and the second handover message is a handover confirmation message; The target ASN is used to receive the second handover message sent by the serving ASN. 13. The system according to claim 12, further comprising an anchor access service network; If the context information of the G-MS and the context information of the Host carried in the second handover message received by the target ASN are available, the target ASN initiates a data channel pre-establishment process with the anchor access service network, the The context information of the Host is used in the data channel pre-establishment process. 14. The system according to claim 12, further comprising an anchor access service network; If the first handover message is a mobile station handover instruction message and the context information of the G-MS and the context information of the Host carried in the second handover message received by the target ASN are available, the target ASN initiates a communication with the An anchor access service network data channel establishment process, the context information of the Host is used in the data channel establishment process. 15. A system for migrating context information, comprising: a service ASN and a target ASN, The target ASN is used to receive a ranging request message from the G-MS, and send a context request message to the serving ASN; The serving ASN is configured to receive a context request message from the target ASN, and send a context report message to the target ASN, where the context report message carries context information of the G-MS and context information of the host Host; The target ASN is also used to receive a context report message from the serving ASN. 16. The system according to claim 15, further comprising an anchor access service network; If the context information of the G-MS and the context information of the Host carried in the context report message received by the target ASN are available, the target ASN initiates a data channel establishment process with the anchor access service network, and the data channel establishment process Use the context information of the Host in the

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