CN101527968B - Interaction method between space network and ground network, and communication protocol gateway - Google Patents

Abstract

The present invention relates to an interaction method between space network and ground network and a communication protocol gateway. The interaction method comprises the following steps: monitoring and receiving network transmission package by the communication protocol gateways which are connected with one another through a distribution mode based on internet through a local main channel; identifying the style of transmission network of network transmission package, allocating the network transmission packages to the space-ground subchannel, ground-space subchannel, space-space subchannel or ground-ground subchannel according to the style of transmission network; transmitting the network transmission packages after executing protocol conversion to the network transmission packages by the space-ground subchannel and ground-space subchannel; and transmitting the network transmission packages after processing the network transmission packages by the space-space subchannel and ground-ground subchannel. The communication protocol gateway comprises a main channel, the space-ground subchannel, the ground-space subchannel, the ground-ground subchannel and space-space subchannel. The invention adopts the communication protocol gateway for converting protocol. The convenient interaction between the space network and the ground network can be realized. Each network transmission package is processed with the channel form. The processing efficiency can be increased and the generation of data transmission bottleneck is prevented.

Description

Interaction method and communication protocol gateway between space network and ground network

technical field

The invention relates to communication technology, in particular to an interaction method between a space network and a ground network and a communication protocol gateway.

Background technique

In recent years, the mobile communication network has gradually transitioned to be composed of multiple heterogeneous networks covering each other, and various heterogeneous networks can be divided into two types: space network and ground network. Space network refers to a network formed by space communication technology, such as a satellite network, and a mobile ad hoc network composed of spacecraft, space stations, space shuttles, space planes and other spacecraft interconnected through space links; ground network refers to Networks formed using ground communication technologies, such as cellular networks, mobile ad hoc networks composed of mobile hosts, Worldwide Interoperability for Microwave Access (hereinafter referred to as: WiMAX) networks and Wireless Local Area Networks (Wireless Local Area Networks; hereinafter referred to as: WLAN), etc.

The development trend of the mobile communication network is to make various networks evolve from isolation to intercommunication and from intercommunication to collaboration. A series of new functions such as self-healing, self-management, self-discovery, self-planning, self-adjustment, and self-optimization are more intelligent and realize a user-oriented free, transparent and seamless air-space-ground integrated information network.

With the continuous development of space network communication and terrestrial Internet technology, the cross-transmission of information between satellites, between satellites and terrestrial networks, and between terrestrial network systems is increasing, which requires a unified, compatible and efficient space communication protocol to ensure . However, there is no unified design and construction of communication protocols for space networks at present, which is especially evident in satellite-ground and inter-satellite communications. In order to meet the development requirements of space technology, in 1982, eight domestic and international space agencies, such as the National Aeronautics and Space Administration (National Aeronautics and Space Administration; hereinafter referred to as: NASA), the European Space Agency (European Space Agency; Abbreviation: ESA) and others initiated the establishment of the Consultative Committee for Space Data System (hereinafter referred to as: CCSDS), whose goal is to realize end-to-end system data communication and processing. In the past 20 years, CCSDS has launched a whole set of technical standards (recommendations), some of which have been directly transformed into official international standards of the International Organization for Standardization (ISO). my country's satellite communications have also begun to use the CCSDS spatial data standard. With the rapid development of the Internet, all ground communication systems have basically adopted all-IP communication methods to support various application requirements and realize the great unification of ground communication protocols.

For data transmission solutions between space networks and terrestrial networks, NASA has launched the "OMNI (Operating Missions as a Nodes on the Internet)" project in recent years. The idea is to extend the commercial Internet (Internet) to spacecraft and realize Anywhere provides end-to-end all-IP connections to ground end users with their spacecraft in the most economical and convenient way, and is currently in the experimental stage.

However, the above-mentioned solutions have the following defects in the implementation process: satellite systems often use their own independently developed communication protocols to update all space networks to transmit data based on IP principles in a short period of time when the tasks are diverse and complex and lack a unified standard. The low feasibility and high cost will consume a lot of funds and research power, and it cannot be well integrated with the ground network.

In the 1980s, CCSDS formulated packet telemetry protocol and remote control series standards one after another. In order to meet the communication requirements of advanced on-orbit systems such as the International Space Station, CCSDS has extended the above two standards (COS) and proposed the Advanced On-Orbit System Standard (AOS). There are currently two optional network access methods for the terrestrial network: connection-oriented asynchronous transfer mode (Asynchronous Transfer Mode; hereinafter referred to as: ATM) and connectionless IP. Most of the traditional gateways are designed for the above-mentioned specific network systems to achieve a specific business function, and it is not easy to expand to other network systems. Such as: the conversion between the AOS and ATM protocols formulated by CCSDS; the IP multicast protocol based on the connectionless routing protocol, how to convert the multicast information of the ground network into the multicast information of the satellite network; use fixed IP allocation for spacecraft , to convert between AOS and IP protocols, etc. Therefore, the synergy of traditional gateways is poor, and the internal structure of gateways is often highly coupled, which can easily become a bottleneck for large-capacity data transmission.

Contents of the invention

The purpose of the present invention is to provide an interaction method and a communication protocol gateway between a space network and a ground network, so as to efficiently realize data transmission between the space network and the ground network.

To achieve the above purpose, the present invention provides an interaction method between a space network and a ground network, including:

Step 100, the communication protocol gateway based on the distributed interconnection of the Internet monitors and receives network transmission packets through the local main channel;

Step 200, the communication protocol gateway identifies the transmission network type of the network transmission packet, and when it is recognized that the transmission network type is air-to-ground transmission or ground-to-air transmission, perform step 300, and when it is recognized that the transmission network type is air-to-air transmission When transmitting or ground transmission, execute step 400;

Step 300, the communication protocol gateway transmits the network transmission packet to the local space-ground sub-channel or ground-space sub-channel according to the type of the transmission network, performs protocol conversion, and then executes step 500;

Step 400, the communication protocol gateway transmits the network transmission packet to the local air-space channel or ground-ground channel for processing according to the type of the transmission network, and executes step 500;

Step 500, the communication protocol gateway sends the network transmission packet in the sub-channel to the corresponding network.

In order to achieve the above object, the present invention also provides a communication protocol gateway, including a main channel, an air-to-ground channel, a ground-to-air channel, a ground-to-ground channel and an air-to-air channel, wherein

The main channels include:

The monitoring and receiving module is used to monitor and receive network transmission packets based on the Internet;

A transmission network category identification module, configured to identify the transmission network category of the network transmission packet;

A distribution module, configured to transmit the network transmission packet to the air-to-ground channel, the ground-to-air channel, the air-to-air channel or the ground-to-ground channel according to the identified transmission network category,

The space-ground sub-channel and the ground-space sub-channel respectively include:

A decapsulation module, configured to perform a decapsulation operation according to the source network protocol of the network transmission packet, to obtain transmission information;

A protocol conversion module, configured to perform protocol conversion on the network transmission packet;

An encapsulation module, configured to perform an encapsulation operation according to the next-hop network protocol of the network transmission packet, and fill in and encapsulate a new network transmission packet according to the transmission information and the next-hop network address;

The first sending module is used to send a new network transmission packet to the corresponding network, and the ground-ground channel and the air-space channel respectively include:

A processing module, configured to process the network transmission packet;

The second sending module is used to send the processed network transmission packet to the corresponding network.

It can be seen from the above technical solutions that the present invention adopts the communication protocol gateway for protocol conversion, which can realize the end-to-end interaction between the space network and the ground network; the communication protocol gateway uses the channel form to process each network transmission packet, which can improve the processing efficiency and avoid the occurrence of Data transmission bottleneck; the functional modules in each sub-channel are independent, and the network transmission packets are operated sequentially to form hierarchical and modular processing, which is conducive to improving processing efficiency.

Description of drawings

Fig. 1 is a network architecture diagram based on the interaction method between the space network and the ground network of the present invention;

Fig. 2 is the structural representation of the strategy server of network softswitch center in Fig. 1;

Fig. 3 is a flow chart of the interaction method between the space network and the ground network provided by the first embodiment of the present invention;

Fig. 4 is a flow chart of the interaction method between the space network and the ground network provided by the second embodiment of the present invention;

5 is a schematic diagram of a network transmission packet transmission path in the interaction method between the space network and the ground network provided by the second embodiment of the present invention;

6 is a schematic diagram of the structure of the communication protocol gateway based on the second embodiment of the present invention;

7 is a flow chart of transmitting a network connection request in the interaction method between the space network and the ground network provided by the third embodiment of the present invention;

FIG. 8 is a flow chart of transmitting a network connection response in the interaction method between the space network and the ground network provided by the third embodiment of the present invention;

9 is a schematic diagram of a network transmission packet transmission path in the interaction method between the space network and the ground network provided by the third embodiment of the present invention;

Fig. 10 is a flow chart of the interaction method between the space network and the ground network provided by the fourth embodiment of the present invention;

Fig. 11 is a schematic diagram of a frame structure of a ground network transmission packet adopted in the fourth embodiment of the present invention;

Fig. 12 is a schematic diagram of a frame structure of the space network remote control packet adopted in the fourth embodiment of the present invention;

13 is a schematic diagram of a frame structure of a space network telemetry packet used in the fourth embodiment of the present invention;

14 is a schematic structural diagram of the main channel in the communication protocol gateway provided by the sixth embodiment of the present invention;

15 is a schematic structural diagram of an air-to-ground channel or a ground-to-air channel in a communication protocol gateway provided by the sixth embodiment of the present invention;

Fig. 16 is a schematic structural diagram of the air-to-space channel or the ground-to-ground channel of the communication protocol gateway provided by the sixth embodiment of the present invention.

Detailed ways

Figure 1 is a network architecture diagram based on the interaction method between the space network and the ground network of the present invention. As shown in Figure 1, the communication network can be divided into multiple areas according to characteristics such as regions or administrative regions, such as the area shown in Figure 1 A, area B, area C, area D and area E, etc. Each area is covered by various networks. For example, area A may be covered by networks such as WiMAX network, WLAN, satellite network (Satelite), and cellular network (Cellular). In the above network architecture, there are multiple network soft-switch centers (Network Soft-switch Center; hereinafter referred to as: NSC) 1, such as NSC A, NSC B, NSC C, NSC D and NSC E, etc., each NSC 1 is based on the IP protocol Interconnected through the Internet to form the Global Network Soft-switch Centers system (Global Network Soft-switch Centers system; hereinafter referred to as: GNSC system). Cooperative Static and Dynamic Routing (hereinafter referred to as: CSDR) routing mode is adopted between each NSC 1, that is, static routing (Static routing) is adopted between backbone NSC 1, which is represented by a solid line in Figure 1 ; Non-backbone NSCs 1 are connected in a dynamic routing (Dynamicrouting) manner, which is represented by a dotted line in FIG. 1 . In this way, efficiency is improved, delay is reduced, and network synergy is enhanced. Terminals in each area are connected to the corresponding NSC 1 through a certain network in the area. NSC 1 is not limited to one-to-one correspondence with a certain area or a certain network, and can be in the form of many-to-many correspondence. The above network architecture can realize distributed control, and each NSC 1 can be responsible for the network optimization of the corresponding area and the network collaborative communication between this area and other areas. The network architecture has high flexibility, and nodes with network management functions can be expanded in a distributed manner according to the actual deployment of the network.

FIG. 2 is a schematic structural diagram of a policy server in the network softswitch center in FIG. 1 . At least one policy server is set in each NSC 1, which is the decision-making center of distributed control, and coordinates and communicates between the core control level and the transmission bearer level. The policy server may include the following functional modules: User Access Control (User Access Control; hereinafter referred to as: UAC) module 8, Sub-Network Access Control (Sub-Network Access Control; hereinafter referred to as: SNAC) module 7, Network State Estimation (Network Condition Estimation; hereinafter referred to as: NCE) module 6, control strategy (ControlStrategy Set; hereinafter referred to as: CSS) module 5, intra-regional network connection (Intra-connection) module 3 and inter-regional network connection (Inter-connection) module 4. Among them, the CSS module 5 is used to select the best idle network for the user according to the network operation status, that is, guide the route of the data transmitted by the user, and determine the link path for implementing the intra-regional network connection or the inter-regional network connection.

In the process of carrying out the research of the present invention, the inventor found that: the air-air link and the air-ground link used in the air experiment and ground communication in the world will still adopt the CCSDS standard protocol for a long time in the future, so the agreement is carried out Conversion, that is, the research of gateway technology to realize the unimpeded communication between the space network and the ground network is very necessary and has far-reaching significance. The communication protocol gateway (GateWay; hereinafter referred to as: GW) 2 is also introduced in the above-mentioned network architecture on which the present invention is based, which is embedded in the Internet in a distributed manner, and is connected to the NSC 1 respectively, and is responsible for connecting each network in the region and/or between regions. This kind of network realizes end-to-end interaction between networks, especially the interaction between space network and ground network. The communication protocol gateway 2 can be connected to the NSC 1 in one-to-one correspondence, and can also be in a many-to-one or one-to-many relationship, which can be designed according to the needs of business traffic. Communication protocol gateway 2 can be a network element independent of NSC 1, or a module integrated in NSC 1. Each communication protocol gateway 2 can communicate with each other through the routing mode of NSC 1, and can also directly communicate with each other through the Internet (the complete connection path is not shown in Figure 1). The interaction method between the space network and the terrestrial network of the present invention is mainly realized by the communication protocol gateway 2. The present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

first embodiment

Fig. 3 is a flow chart of the interaction method between the space network and the ground network provided by the first embodiment of the present invention. The method of this embodiment can be implemented by a communication protocol gateway based on the network architecture shown in Figure 1, and the specific steps are as follows:

Step 100, a communication protocol gateway based on the distributed interconnection of the Internet, monitors and receives network transmission packets through the local main channel;

Step 200, the communication protocol gateway identifies the transmission network type of the network transmission packet. When it is recognized that the transmission network type is air-to-air transmission or ground-to-air transmission, execute step 300. When it is identified that the transmission network type is air-to-air transmission or ground-to-ground transmission, execute Step 400;

Step 300, the communication protocol gateway transmits the network transmission packet to the local air-ground sub-channel or ground-space sub-channel according to the type of the transmission network, and performs protocol conversion, and then executes step 500;

Step 400, the communication protocol gateway transmits the network transmission packet to the local air-space separation channel or ground-ground separation channel for processing according to the transmission network type, and executes step 500;

Step 500, the communication protocol gateway sends the network transmission packet in the sub-channel to the corresponding network, specifically to a designated application process in the receiving network element in the corresponding network, such as a broadcast or multicast program.

Adopting the technical solution of this embodiment, the communication protocol gateway realizes communication based on channels, and the main channel monitors and receives network transmission packets, and then assigns them to sub-channels for processing according to the category of network transmission packets, which can be used for air-ground, ground-air categories The protocol conversion of the network transmission packet realizes the unimpeded interaction between the space network and the ground network, and the improvement of the existing space network and the ground network is small, especially there is no need to adjust the CCSDS standard on which the current space network is based, so it is feasible Good performance and low cost. In addition, each sub-channel can process air-to-ground, ground-to-air, ground-to-ground or air-to-air network transmission packets in parallel, which improves processing efficiency and prevents the gateway from becoming a bottleneck in network transmission.

second embodiment

Fig. 4 is a flow chart of the interaction method between the space network and the ground network provided by the second embodiment of the present invention. The method in this embodiment can still be implemented based on the network architecture shown in FIG. 1 through the cooperation of the communication protocol gateway and the NSC. Fig. 5 is a schematic diagram of a network transmission packet transmission path in the interaction method between the space network and the ground network provided by the second embodiment of the present invention, and the figure shows two similar transmission situations. One of the transmission situations is specifically that the terminal in the satellite network in the area responsible for NSC B sends request data to the terminal in the ground cellular network in the area in charge of NSC A through NSC A and the corresponding GW A, and the terminal in the cellular network receives the request The process of returning response data to the terminal in the satellite network after the data. The second transmission situation is specifically that the terminal in the ground WiMAX network in the area responsible for NSC A sends request data to the terminal in the satellite network in the area in charge of NSC B through NSC B and the corresponding GW B, and the terminal in the satellite network receives the request data. The process of returning response data to the terminal in the WiMAX network after data. In FIG. 5 , the dotted line is the sending path of the request data, and the dotted line is the sending path of the response data. Both the request data and the response data belong to a kind of network transmission packets. The following takes the second case as an example to describe the specific steps in detail.

Specific steps are as follows:

Step 100 of the foregoing embodiment may specifically be:

Step 110: The NSC based on the distributed interconnection of the Internet receives the network transmission packet initiated by the user terminal. The NSC may be the first hop network element that receives the network transmission packet, or it may be the network element that receives the forwarded network transmission packet. The Nth hop network element, wherein N is a natural number, specifically NSC B receives the network transmission packet initiated by the terminal in the WiMAX network in the present embodiment;

Step 120, the NSC B determines the next-hop network address of the network transmission packet according to the network operation situation and the destination network address in the network transmission packet, and simultaneously determines the gateway address capable of reaching the next-hop network, and sends the next-hop network address Both the hop network address and the gateway address are added to the network transmission packet. Specifically, the network transmission packet usually contains the destination network address, and the policy server in NSC B can perform policy allocation. For example, the CSS will combine the destination network with parameters such as network bandwidth occupancy rate and network element load based on the current network operation status. The address selects a better transmission path for the network transmission packet;

Step 130, the communication protocol gateway (GW) connected to NSC B periodically monitors NSC B with a set weighted frequency. The communication protocol gateway can be connected to one NSC or multiple. When GW B detects that there is a network transmission packet in NSC B whose gateway address is the local address, GW B receives the network transmission packet through the local main channel.

On the basis of the above-mentioned scheme, after the setting weighted frequency adopted by the communication protocol gateway monitoring is initialized, it can be adjusted during the monitoring process. Specifically, before the above-mentioned step 130, the following steps may also be included:

内到达GW B的网络传输包的数量Q，其中，k·f为设定加权频率，f为大于零的常数，k为频率变化系数，且0＜k₁≤k≤k₂，k₁和k₂为设定的常数；Step D10, statistical setting time

The number Q of network transmission packets arriving at GW B within a period, where k·f is the set weighted frequency, f is a constant greater than zero, k is the frequency variation coefficient, and 0<k ₁ ≤k≤k ₂ , k ₁ and k ₂ is a set constant;

时间内到达该网关的网络传输包的数量Q，则按照公式(1)计算流量与设定加权频率的比值r：Step D20, first initialize the frequency change coefficient k, and judge whether the set weighted frequency k f used in monitoring meets the requirements for changing the speed of business traffic, and the speed of business traffic is

The quantity Q of network transmission packets arriving at the gateway within a certain period of time, then calculate the ratio r of the flow rate to the set weighted frequency according to the formula (1):

$\mathrm{<span\; class="notranslate">\; r</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; Q</span>}}{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; f</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

And compare the ratio r with the minimum threshold value r ₁ and the maximum threshold value r ₂ , if r ₁ ≤ r ≤ _{r 2} , it means that the set weighted frequency satisfies the service flow speed change requirement, and execute step 130; otherwise, when r< When r ₁ or r>r _2, execute step D30;

Step D30, adjusting the frequency change coefficient k within the range of 0<k ₁ ≤ k ≤ k ₂ , and recalculating the ratio r according to the adjusted frequency change coefficient k;

Step D40, identify the ratio r, if r ₁ ≤ r ≤ r ₂ , take the adjusted frequency change coefficient k, this adjustment can be performed multiple times until r ₁ ≤ r ≤ _{r 2} , if 0<k ₁ ≤ In the range of k≤k ₂ it is always r<r ₁ , that is $\frac{Q}{k\&Center\; Dot;f}<r_1,$ Or after adjusting the set times, it is still $\frac{Q}{k\&Center\; Dot;f}<r_1,$ Then set k=k ₁ , if it is always r>r ₂ in the range of 0<k ₁ ≤k≤k ₂ , namely $\frac{\mathrm{<figure-callout\; id="2"\; label="Q\; k"\; filenames="H2009100819638E00011.png"\; state="\{\{state\}\}">Q</figure-callout>}}{k_{}}>{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="H2009100819638E00011.png"\; state="\{\{state\}\}">r</figure-callout>}}_2,$ Or after adjusting the set times, it is still $\frac{\mathrm{<figure-callout\; id="2"\; label="Q\; k"\; filenames="H2009100819638E00011.png"\; state="\{\{state\}\}">Q</figure-callout>}}{k_{}}>{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="H2009100819638E00011.png"\; state="\{\{state\}\}">r</figure-callout>}}_2,$ Then set k=k ₂ ;

Step D50 , update and set the weighted frequency k·f according to the adjusted frequency variation coefficient k, and execute step 130 . By adopting the above solution, the communication protocol gateway can adjust and set the weighted frequency according to the change of the service flow, so as to obtain the network transmission packets in time without wasting bandwidth resources. Specifically, the maximum value and the minimum value of the weighted frequency can be respectively limited, and according to the increase or decrease speed of the service flow, the variation coefficient of the increase or decrease of the periodic monitoring frequency is correspondingly increased or decreased.

Before performing step 200, the following steps may be performed:

Step A10, GW B identifies the transmission area type of the network transmission packet, when it is recognized that the transmission area type is inter-area transmission, execute step A20, when it recognizes that the transmission area type is intra-area transmission, execute step A30, identify the transmission area type The method may be to obtain the previous hop network address and the next hop network address by parsing from the network transmission packet, so as to identify whether the network transmission packet is transmitted within the area or transmitted from other areas to the inter-area within the area. After the network transmission packet is forwarded hop by hop, the network address of each hop can be carried in the network transmission packet;

Step A20, GW B transmits the network transmission packet to the local inter-area channel for processing according to the transmission area category, and skips step A30 to perform subsequent steps;

Step A30, GW B transmits the network transmission packet to the local intra-area channel for processing according to the transmission area category, and executes subsequent steps.

Step 200 may specifically include the following steps:

Step 210, GW B parses and obtains the previous-hop network address and the next-hop network address from the network transmission packet;

Step 220, GW B identifies the transmission network type of the network transmission packet according to the previous hop network address and the next hop network address. The address and the next-hop network address can identify the previous-hop network and the next-hop network of the network transmission packet. When it is recognized that the type of the transmission network is air-ground transmission or ground-to-air transmission, perform step 300, and when it is recognized that the type of the transmission network is air-to-air transmission or ground-to-ground transmission, perform step 400;

Step 300, GW B transmits the network transmission packet to the local air-ground sub-channel or ground-space sub-channel according to the type of transmission network, and performs protocol conversion, and then executes step 500;

Step 400, GW B transmits the network transmission packet to the local air-space separation channel or ground-ground separation channel for processing according to the transmission network type, and executes step 500;

Step 500, GW B sends the network transmission packet in the sub-channel to the corresponding network. Specifically, it can be sent to the specified application process in the receiving network element in the corresponding network. It can be based on the destination network address or the next hop in the network transmission packet. The network address sends the network transmission packet. In this embodiment, GW B transmits the protocol-converted network transmission packet to the satellite network.

Thereafter, it may also include a process in which the satellite network returns the network transmission packet as the response data to the terminal in the WiMAX network. Specifically, the satellite network can send the network transmission packet to NSC B, and NSC B can be assigned to GW B for processing, and GW B converts the network transmission packet to the protocol before sending it to the WiMAX network terminal, as shown in Figure 5. The network transmission packets transmitted according to the above method are sent hop by hop, and the transmission path of the request data and the transmission path of the response data can be the same or different. For example, the satellite network can also send the network transmission packet as the response data to NSC A, NSC A can be assigned to GW A for processing, and GW A converts the network transmission packet to the protocol before sending it to the WiMAX network terminal. During the transfer process, the NSC can optimize the next-hop path in real time according to the network operation status. Generally, data with low real-time requirements and insensitive to delay can be transmitted in the above-mentioned manner.

In this embodiment, the communication protocol gateway implements communication based on the channel mode. FIG. 6 is a schematic structural diagram of the communication protocol gateway based on the second embodiment of the present invention. As shown in FIG. 6 , the communication protocol gateway includes a main channel 20, Under the main channel 20, inter-area sub-channels 21 and intra-area sub-channels 22 are arranged. Under the inter-regional sub-channels 21, space-ground sub-channels 211, ground-space sub-channels 212, ground-ground sub-channels 213, and air-space sub-channels 214 are set. 22 is provided with an air-to-ground channel 221 , a ground-to-air channel 222 , a ground-to-ground channel 223 and an air-to-air channel 224 . Various types of network transmission packets are processed in parallel and asynchronously in the sub-channel, and each network transmission packet is processed in a process-by-process manner in the sub-channel. In the above step 300 or step 400, after the network transmission packet is transmitted to the sub-channel, step B10 is also included, the communication protocol gateway can set the service priority for the network transmission packet to indicate the process of processing each network transmission packet in the sub-channel order.

The above steps A10-A30 can not only be performed before step 200, but also in step 400, before step 500 is performed, and steps A10-A30 are performed, first identify the type of transmission network, and then identify the type of transmission area, and adjust the setting of sub-channels accordingly relationship.

third embodiment

Fig. 7 is a flow chart of transmitting a network connection request in the interaction method between the space network and the ground network provided by the third embodiment of the present invention, and Fig. 8 is the interaction between the space network and the ground network provided by the third embodiment of the present invention Flowchart of the transport network connection response in the method. This embodiment may be based on the above-mentioned first embodiment, and may still be implemented based on the network architecture shown in FIG. 1 through the cooperation of the communication protocol gateway and the NSC. Fig. 9 is a schematic diagram of the network transmission packet transmission path in the interaction method between the space network and the ground network provided by the third embodiment of the present invention. In this embodiment, it is specifically data with high real-time requirements for terminal interaction between the ground network and the space network Services, such as voice calls, etc. Specifically include the following steps:

Step E1, the NSC based on the distributed interconnection of the Internet receives the network connection request initiated by the terminal, the network connection request is used to establish a link between networks, and is also a kind of network transmission packet;

Step E2, the NSC determines the next-hop network address and the gateway address connecting the next-hop network according to the network operation status and the destination network address of the network connection request, and adds them to the network connection request;

Step E3, based on the Internet-based communication protocol gateway that is distributed and interconnected, periodically monitors one or more NSCs connected to itself, and receives a network connection request through the local main channel when the monitored gateway address is the local address;

Step E4, the communication protocol gateway identifies the transmission network type of the network connection request, when it is recognized that the transmission network type is air-ground transmission or ground-air transmission, execute step E5, when it is recognized that the transmission network type is air-air transmission or ground-ground transmission, Execute step E6;

Step E5, the communication protocol gateway transmits the network connection request to the local air-ground sub-channel or ground-space sub-channel according to the transmission network type, and performs protocol conversion, and then executes step E7;

Step E6, the communication protocol gateway transmits the network connection request to the local air-space separation channel or ground-ground separation channel for processing according to the transmission network type, and executes step E7;

Step E7, the communication protocol gateway sends the network connection request in the sub-channel to the corresponding network according to the next-hop network address.

Repeat steps E1-E7 above until the next-hop network address is the destination network address, that is, the network connection request is sent to the destination network. In this embodiment, for the sake of simplicity, the first next-hop network is the destination network, and then the terminal in the destination network needs to feed back the network connection response to the terminal that initiated the network connection request, that is, perform the following steps:

Step E8, the destination network of the network connection request is used as the source network at this time, and the network connection response initiated by the terminal is received by the NSC based on the distributed interconnection of the Internet. The network connection response is also a kind of network transmission packet, which carries the transmission path of the network connection request The hop-by-hop network address of

Step E9, the NSC determines the next-hop network address and the gateway address connecting to the next-hop network according to the hop-by-hop network address in the network connection response, and adds them to the network connection response;

Step E10, the communication protocol gateway based on the Internet is distributed and interconnected, periodically monitors one or more NSCs connected to itself, and receives a network connection response through the local main channel when the monitored gateway address is the local address;

Step E11, the communication protocol gateway identifies the transmission network type of the network connection response, when it is recognized that the transmission network type is air-ground transmission or ground-air transmission, execute step E12, when it is recognized that the transmission network type is air-air transmission or ground-ground transmission, Execute step E13;

Step E12, the communication protocol gateway transmits the network connection response to the local air-ground sub-channel or ground-space sub-channel according to the transmission network type, and performs protocol conversion, and then executes step E14;

Step E13, the communication protocol gateway transmits the network connection response to the local air-space separation channel or ground-ground separation channel for processing according to the transmission network type, and executes step E14;

Step E14, the communication protocol gateway sends the network connection response in the sub-channel to the corresponding network according to the next-hop network address.

The above steps E8-E14 are repeated until the network connection response is sent to the destination network. A network connection path can be established after the transmission of the network connection request and the network connection response. The network connection response carries the hop-by-hop network address, and the terminal can transmit the data packets with high real-time requirements to the destination network through various communication protocol gateways according to the hop-by-hop network address, without having to go through the path optimization of the NSC.

The above technical solution can be applied to the transmission of data services with high real-time requirements. Network connection requests, network connection responses and service data packets can all be called network transmission packets, which are sent to the next hop by the communication protocol gateway after protocol conversion network. The communication protocol gateway uses a channel form to process each network transmission packet, which can improve processing efficiency and prevent the communication protocol gateway from becoming the bottleneck of data transmission.

Fourth embodiment

Fig. 10 is a flow chart of the interaction method between the space network and the ground network provided by the fourth embodiment of the present invention. This embodiment can be based on any of the above-mentioned embodiments, specifically in step 300, the communication protocol gateway transmits the network transmission packet to the local air-ground sub-channel or ground-space sub-channel according to the transmission network type, and performs protocol conversion including the following steps:

Step 301, the communication protocol gateway decodes the network transmission packet;

Step 302, the communication protocol gateway judges whether the decoding is successful, if so, execute step 303;

Step 303, the communication protocol gateway identifies the packet type of the network transmission packet, and when it is identified as a signal packet, execute step 304, and when it is identified as a data packet, execute step 305;

Step 304, the communication protocol gateway judges whether the signal type of the signal packet is an end request signal for ending the application process at the current communication protocol gateway, if so, then end this operation, if not, then execute step 305;

Step 305, the communication protocol gateway performs a decapsulation operation according to the source network protocol of the network transmission packet, and analyzes and obtains the transmission information therein;

Step 306, the communication protocol gateway creates a new network transmission packet, fills and encapsulates the new network transmission packet according to the transmission information, the next-hop network address and the related next-hop information according to the next-hop network protocol of the original network transmission packet , the next-hop network protocol can be determined according to the next-hop network address;

Step 307 , the communication protocol gateway encodes the encapsulated new network transmission packet, and executes step 500 .

In the above technical solution, between step 305 and step 306:

Step C1, the communication protocol gateway judges whether to perform a relay operation, that is, judges whether the network transmission packet needs to be relayed to other networks when it is sent to the user's destination network, and if so, the next-hop network is a relay network, and step C2 is performed , otherwise execute step 306;

Step C2, the communication protocol gateway can identify the next-hop network according to the next-hop network address, that is, determine the communication protocol gateway corresponding to the relay network, the determined communication protocol gateway is the communication protocol gateway that needs to be connected after passing through the relay network, The gateway address of the communication protocol gateway is used as the address to be relayed to, so as to be filled in and encapsulated into a network transmission packet, and then step 306 is executed to perform relay network transmission.

In the above technical solution, when the communication protocol gateway judges that the decoding is unsuccessful in step 302, the following operations are performed:

Step 308, introducing a retransmission mechanism, the communication protocol gateway judges whether the timeout threshold is reached, if not, then sends a retransmission request signal to the previous hop network element of the network transmission packet transmission path, and returns to step 100, if it has overtime, then execute step 309;

Step 309, the communication protocol gateway discards the network transmission packet, and ends this operation.

If the communication protocol gateway is abnormal, start the backup communication protocol gateway, continue the corresponding work, and try to solve the problem of abnormal operation of the original communication protocol gateway.

After the above processing, when the sub-channel sends the network transmission packet to the corresponding network, it can further determine whether it is necessary to return a response signal to the sender in the previous hop network, and if so, return a response signal.

In the above steps 305 and 306, the protocol conversion process of the ground-to-space channel and the space-to-ground channel are different. Specifically, the encapsulation operation performed by the ground-space separation channel specifically includes the following steps:

Step 305a, the communication protocol gateway performs the decapsulation operation according to the source network protocol of the network transmission packet. FIG. 11 is a schematic diagram of a frame structure of the terrestrial network transmission packet used in the fourth embodiment of the present invention, and FIG. 12 is the fourth embodiment of the present invention. A schematic diagram of a frame structure of the space network remote control packet used in the embodiment, and FIG. 13 is a schematic diagram of a frame structure of the space network telemetry packet used in the fourth embodiment of the present invention. The source network is one of the ground networks. According to the corresponding protocol of the ground network, the transmission information in the ground network transmission packet is analyzed and obtained, that is, the transmission frame header, IP header, transmission protocol header, destination user information header and source data of the ground network are analyzed and obtained. wait. The ground network transmission frame header can include the Medium Access Control (Medium Access Control; hereinafter referred to as: MAC) address and type of the ground physical network source host and destination host, the frame tail is a checksum, and the IP header can include the source host and destination host IP address, type, lifetime, etc., and the transport protocol header can include source host and destination host port numbers, sequence numbers, confirmation numbers, checksums, etc. The destination user information header can include the destination network identification and application process, and consists of three parts: relay network, destination network, and sub-information header; the relay network indicates that if the network transmission packet reaches the destination user terminal and needs to relay the space network, fill in Relay network identifier, otherwise this item can be omitted; the destination network is the network where the destination user terminal is located; the sub-information header is used to describe the information related to the characteristics of the destination user terminal, such as: destination user name, address, etc., and identify the transmitted data Type; if no user data needs to be sent when sending a transport frame, then a transport frame with a specific identifier representing empty data is sent.

Step C1a, the communication protocol gateway judges whether to relay the space network according to the destination network identifier in the destination user information header, if so, then the next-hop network is a relay network, and executes step C2a, otherwise executes step 306a;

Step C2a, the communication protocol gateway determines the address of the communication protocol gateway corresponding to the relay network according to the next-hop network address, as the address to be relayed so as to fill in and encapsulate into the network transmission packet, and then execute step 306a;

Step 306a, the communication protocol gateway creates a new network transmission packet, fills and encapsulates it into the new space network transmission packet according to the next-hop space network protocol of the original network transmission packet, according to the transmission information and related next-hop address information. Space network transmission frame header, remote control source packet header and telemetry source packet header adopt the frame format of CCSDS standard protocol, and specific relevant information can be filled in according to different space networks, such as: main channel identification, virtual channel identification and signaling domain, etc. The destination user data header consists of three parts: relay network, destination network, and auxiliary data header. The specific meaning is similar to that of the destination user information header. The source data length is variable. The error control field is optional, and the key information of the transmission frame is protected by encoding with error correction capability. When the space network is the destination network, the relay network and the destination network in the destination user data header can be omitted, and fill in the transmission frame header and source packet segment guide of the telemetry packet corresponding to the space network communication protocol according to the space network and destination user address information. header and the transmission frame header and source packet header of the remote control packet; if the space network is a relay network, the destination network of the destination user information header is filled in the destination network location of the destination user data header, and the space network to be relayed is filled in Enter the relay network identification position of the destination user data header, and fill in the transmission frame header, source packet segment leader and remote control Packet transmission frame header, source packet header; whether the relay operation is performed or not, the sub-information header of the destination user information header is filled in the sub-data header of the destination user data header of the space network transmission frame, and then the source data and other information are transmitted Encapsulation forms a new space network transmission packet.

The processing process of the space-ground sub-channel is similar to that of the ground-space sub-channel. The gateway analyzes and obtains the transmission information in the space network transmission packet according to the corresponding protocol of the space network, that is, parses and obtains the transmission frame header and source packet segment of the telemetry packet corresponding to the space network communication protocol. Header, destination user data header, transmission frame header of remote control packet, source packet segment header, source data, etc. When the terrestrial network is the destination network, the relay network and the destination network in the destination user information header can be omitted, and fill in the transmission frame header, IP header, and transmission protocol header corresponding to the terrestrial network protocol according to the terrestrial network and destination user address information; When the network is a relay network, the destination network of the destination user data header is filled in the destination network location of the destination user information header, the ground network to be relayed is filled in the relay network identification position of the destination user information header, and the relay Fill in the transmission frame header, IP header, and transmission protocol header corresponding to the ground network communication protocol for the ground network and the address information to be passed through the gateway after it; whether the relay operation is performed or not, the sub-data header of the destination user data header is filled in the ground network transmission The sub-information header of the destination user information header of the frame is then encapsulated by source data and other transmission information to form a new terrestrial network transmission packet.

The technical solutions of the various embodiments of the present invention enable end-to-end mutual communication connection among the satellite network, the WiMAX network, the cellular network and the WLAN. At present, the CCSDS standard protocol is mostly used in the space network. The interconnection communication of the IP communication protocol can be realized between the WiMAX network, Cellular and WLAN. The commonly used communication protocols include Transmission Control Protocol/Internet Protocol (Transmission Control Protocol/Internet Protocol; the following Abbreviation: TCP/IP), User Datagram Protocol/IP (User Datagram Protocol/IP; hereinafter referred to as: UDP/IP), etc.

By adopting the technical solutions of the embodiments of the present invention, communication protocol gateways can be respectively configured in different regions according to the distributed network networking architecture, and the communication protocol gateways can be embedded in the Internet. Each communication protocol gateway adopts a hierarchical and modular design to be responsible for various network connections within the corresponding region and connection requests from the external regional network to the regional network, and communicates in the form of channels, which can be named by numbering. The number of sub-channels in the communication protocol gateway can be increased or decreased according to specific implementation conditions, for example, it can include multiple ground sub-channels, multiple ground-space sub-channels, and the like. Each sub-channel can be responsible for the user to connect and communicate with one or more networks in the area. For example, for the ground sub-channel, the form of the terrestrial network may be a cellular network, a WiMAX network or a WLAN, etc., and the ground sub-channel can handle traffic from different Network transport packets for terrestrial networks.

In the communication protocol gateway channel processing user connection request communication process in the embodiment of the present invention, a multi-level process is adopted to work in parallel and asynchronously, specifically: a first-level monitoring process, a second-level connection request allocation process, and a third-level based on the ground network protocol And the conversion process of the space network protocol can also have a four-level error control process, that is, before each sub-channel sends the network transmission packet to the next-hop network, the sub-channel is processed by error checking, according to the encoding method of the network transmission packet coding for error control.

fifth embodiment

The interaction method between the space network and the ground network provided by the fifth embodiment of the present invention can be based on any of the above-mentioned embodiments, and further implement a process semi-dynamic control mechanism in each sub-channel of the communication protocol gateway, in step 300 and step 400 Each network transmission packet processed by sub-channel is a process. A process can be set to at least three states, namely working state, busy state and idle state. A process in a working state can receive network transmission packets for processing, a process in a busy state is processing network transmission packets and cannot receive new network transmission packets, and a process in an idle state does not work and does not receive network transmission packets. Each sub-channel can dynamically set the status of the process according to the number of network transmission packets currently received. For process control by channel, the following operations can be performed:

Step F1, counting the number of unprocessed network transmission packets received by the channel itself and counting the status of each process. Under normal conditions or initial conditions, a certain number of processes will be set to be in the working state, and the number is Pn;

Step F2, when the sub-channel determines that the number of unprocessed network transmission packets reaches the set threshold value, create one or more processes, or set the process in the idle state to the working state;

Step F3, when the sub-channel judges that the number of processes in the busy state reaches the set threshold, create one or more processes, or set the processes in the idle state to the working state;

Step F4. When the sub-channel determines that the number of processes in the working state reaches the set threshold value, set one or more processes in the working state to an idle state, or delete the processes with a set number of PL.

The order of the above steps F2-F4 can be interchanged, and is not limited to the above-mentioned judgment operation. Various condition settings can be used to complete the dynamic control of the number and state of the process, and control the state of each process at any time as needed to meet the processing of network transmission packets Require.

Sixth embodiment

The communication protocol gateway provided by the sixth embodiment of the present invention specifically includes a main channel, an air-to-ground channel, a ground-to-air channel, a ground-to-ground channel, and an air-to-air channel, and may further include an inter-regional channel and an intra-regional channel. Schematic diagram of the structure See Figure 6. Wherein, as shown in Figure 14, the main channel includes: a monitoring and receiving module 1401, which is used to monitor and receive network transmission packets from various networks or NSCs based on the Internet; a transmission network category identification module 1402, which is used to identify the transmission network category of the network transmission packets ; The allocation module 1403 is configured to transmit the network transmission packet to the space-ground channel, the ground-space channel, the air-space channel or the ground-ground channel according to the identified transmission network type. As shown in Figure 15, the structures of the space-ground sub-channel and the ground-space sub-channel are similar, including: a decapsulation module 1501, which is used to perform decapsulation operations according to the source network protocol of the network transmission packet, and obtain transmission information; a protocol conversion module 1502, It is used to perform protocol conversion on network transmission packets communicated between air-ground or ground-air links; encapsulation module 1503 is used to perform encapsulation operations according to the next-hop network protocol of network transmission packets, and fill in according to the transmission information and the next-hop network address Encapsulate the new network transmission packet; the first sending module 1504 is configured to send the new network transmission packet to the corresponding network. As shown in Figure 16, the structure of the ground-ground channel and the air-space channel is similar, including: a processing module 1601, which is used to process network transmission packets, such as protocol conversion processing between ground networks, error checking processing, etc.; The second sending module 1602 is configured to send the processed network transmission packet to the corresponding network.

The communication protocol gateway of the present invention can execute the technical solution of any embodiment of the interaction method between the space network and the ground network of the present invention, has corresponding functional modules for performing the above operations, and can further set an error processing module, a retransmission processing module, etc. . Due to the limited system resources, it is necessary to consider dividing multiple tasks into several modules for processing even if the coordination of multiple processes included in the sub-channel works normally. The present invention adopts a hierarchical and modularized design framework, so that each module is as independent and universal as possible, and has good scalability. Communication in the form of channels can improve communication efficiency and reduce communication delays in end-to-end connections between networks. At the same time, in order to reduce the waiting delay of the user process and avoid the waste of system resources, considering that the user's needs may change randomly, the priority can be set for service, and a multi-process asynchronous parallel processing method and a semi-dynamic control mechanism are introduced to improve the performance of the gateway. , to solve the bottleneck problem. The invention can realize the end-to-end connection between the space network and the ground network, and can obtain better balance performance in terms of improving communication efficiency, reducing access delay, saving system resources, maintaining system security and upgradeability.

Those of ordinary skill in the art can understand that all or part of the steps for realizing the above-mentioned method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the It includes the steps of the above method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (10)

1. the exchange method between spatial network and ground network is characterized in that, comprising:

Step 100, be distributed interconnected communication protocol gateway, monitor and receive network transmission package by local main channel based on the internet;

Step 200, described communication protocol gateway are discerned the transmission network classification of described network transmission package, when recognizing described transmission network classification when being vacant lot transmission or the empty transmission in ground, execution in step 300 is absolutely empty transmission or when transmission ground ground when recognizing described transmission network classification, execution in step 400;

Step 300, described communication protocol gateway are sent to the empty subchannel of local vacant lot subchannel or ground according to described transmission network classification with described network transmission package, and carry out protocol conversion, and then execution in step 500;

Step 400, described communication protocol gateway are handled absolutely empty subchannel or ground, ground subchannel that described network transmission package is sent to this locality according to described transmission network classification, and execution in step 500;

Step 500, described communication protocol gateway are sent to map network with the network transmission package in the subchannel.

2. the exchange method between spatial network according to claim 1 and ground network is characterized in that, described step 100 specifically comprises:

Step 110, be distributed interconnected network soft switch center based on the internet and receive the network transmission package that user terminal is initiated;

Step 120, described network soft switch center are determined the next-hop network address of described network transmission package according to the purpose network address in network operation situation and the described network transmission package, and described next-hop network address is added in the described network transmission package;

Step 130, described communication protocol gateway adopt the setting weighted frequency periodically to monitor described network soft switch center, and receive described network transmission package by the main channel.

3. the exchange method between spatial network according to claim 2 and ground network is characterized in that, before the described step 130, also comprises:

Step D10, statistics setting-up time

The interior quantity Q that arrives the network transmission package of described communication protocol gateway, wherein, kf is for setting weighted frequency, and f is the constant greater than zero, and k is the frequency change coefficient, and 0＜k ₁≤ k≤k ₂, k ₁And k ₂Be the constant of setting;

Step D20, according to formula (1) calculated flow rate and the ratio r of setting weighted frequency:

And comparison ratio r and minimum threshold r ₁With maximum threshold r ₂, if r ₁≤ r≤r ₂, then execution in step 130, otherwise execution in step D30;

Step D30, at 0＜k ₁≤ k≤k ₂Scope in adjust described frequency change coefficient k, and recomputate described ratio r according to adjusted described frequency change coefficient k;

If step D40, identification ratio r are r ₁≤ r≤r ₂, then get adjusted frequency change coefficient k, if r＜r ₁, then set k=k ₁, if r＞r ₂, then set k=k ₂

Step D50, upgrade described setting weighted frequency kf according to adjusted frequency change coefficient k, and execution in step 130.

4. the exchange method between spatial network according to claim 2 and ground network is characterized in that, the transmission network classification that communication protocol gateway is discerned described network transmission package in the described step 200 specifically comprises:

Step 210, described communication protocol gateway are resolved from described network transmission package and are obtained the last jumping network address and a next-hop network address;

Step 220, described communication protocol gateway are according to the described last one transmission network classification of jumping the network address and the described network transmission package of next-hop network Address Recognition.

5. the exchange method between spatial network according to claim 2 and ground network is characterized in that, before described step 200, or before the execution in step 500, also comprises in described step 400:

Steps A 10, communication protocol gateway are discerned the transmission region classification of described network transmission package, when recognizing described transmission region classification when being interregional transmission, execution in step A20, when recognizing described transmission region classification when transmitting in for the zone, execution in step A30, described zone is that communication network obtains according to region or administrative division branch;

Steps A 20, communication protocol gateway are sent to local interregional subchannel according to described transmission region classification with described network transmission package and handle, and skips steps A30 carries out subsequent step;

Steps A 30, communication protocol gateway are sent to the interior subchannel in local zone according to described transmission region classification with described network transmission package and handle, and carry out subsequent step.

6. the exchange method between spatial network according to claim 1 and ground network is characterized in that, in described step 300 or step 400, after described network transmission package is transferred into subchannel, also comprises:

Step B10, described communication protocol gateway are that described network transmission package is provided with service priority, handle the order of described network transmission package with the indication subchannel.

7. the exchange method between spatial network according to claim 1 and ground network, it is characterized in that, in the step 300, communication protocol gateway is sent to the empty subchannel of local vacant lot subchannel or ground according to described transmission network classification with described network transmission package, and carries out protocol conversion and specifically comprise:

Step 301, described communication protocol gateway carry out decode operation to described network transmission package;

Step 302, described communication protocol gateway judge whether to decode successfully, if then execution in step 303;

Step 303, described communication protocol gateway are discerned the bag type of described network transmission package, when recognizing to signal packet, and execution in step 304, when recognizing to packet, then execution in step 305;

Step 304, described communication protocol gateway judge whether the signal type of described signal packet is the ending request signal that is used for finishing at current communication protocol gateway application process, if, then finish this operation, if not, then execution in step 305;

Step 305, described communication protocol gateway carry out the decapsulation operation according to the source network agreement of described network transmission package, resolve the transmission information of obtaining wherein;

Step 306, described communication protocol gateway are created a new network transmission package, according to the next-hop network agreement of legacy network transmission package, fill in the described new network transmission package of encapsulation according to described transmission information and next-hop network address;

Step 307, described communication protocol gateway carry out encoding operation to encapsulating the new network transmission package in back, and execution in step 500.

8. the exchange method between spatial network according to claim 7 and ground network is characterized in that, judges decoding when unsuccessful when communication protocol gateway in the step 302, also comprises:

Step 308, described communication protocol gateway judge whether to reach overtime threshold value, if not, then send the repeat requests signal, and return execution in step 100, if then execution in step 309;

Step 309, described communication protocol gateway abandon described network transmission package, and finish this operation.

9. the exchange method between spatial network according to claim 7 and ground network is characterized in that, also comprises between described step 305 and step 306:

Step C1, described communication protocol gateway judge whether to carry out operation of relays, if then next-hop network is a junction network, and execution in step C2, otherwise execution in step 306;

Step C2, described communication protocol gateway determine the address of the communication protocol gateway of junction network correspondence according to the next-hop network address, so that fill in and be encapsulated into network transmission package, then execution in step 306 as treating relay address.

10. a communication protocol gateway is characterized in that, comprise main channel, vacant lot subchannel, empty subchannel, ground subchannel and absolutely empty subchannel, wherein

Described main channel comprises:

The monitoring reception module is used for monitoring and receive network transmission package based on the internet;

Transmission network classification identification module is used to discern the transmission network classification of described network transmission package;

Distribution module, be used for according to the transmission network classification that recognizes with network transmission package be sent to described vacant lot subchannel, empty subchannel, absolutely empty subchannel or ground, ground subchannel,

The empty subchannel of described vacant lot subchannel and ground comprises respectively:

Decapsulation module is used for carrying out the decapsulation operation according to the source network agreement of described network transmission package, obtains transmission information;

Protocol conversion module is used for described network transmission package is carried out protocol conversion;

Package module is used for carrying out encapsulation operation according to the next-hop network agreement of described network transmission package, fills in the new network transmission package of encapsulation according to described transmission information and next-hop network address;

First sending module is used to send new network transmission package to corresponding network,

Described ground ground subchannel and absolutely empty subchannel comprise respectively:

Processing module is used for described network transmission package is handled;

Second sending module is used to send network transmission package after the processing to corresponding network.

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