WO2011124132A1

WO2011124132A1 - Data communications system and method

Info

Publication number: WO2011124132A1
Application number: PCT/CN2011/072489
Authority: WO
Inventors: 晏祥彪
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-04-07
Filing date: 2011-04-07
Publication date: 2011-10-13
Also published as: CN102215160A; CN102215160B

Abstract

The invention discloses a data communications system and method. The method is implemented based on the data communications system with an identity-location- separation architecture, and a transfer path is preset in the system. The method includes: A. after receiving a first data message, a first route node obtains the route identifier of the next route node to the first route node, i.e. a second route node, on the matched transfer path according to the source address and destination address in the first data message,; wherein, the first route node is a source access service node (ASN) or a transfer service node (TSN), and the second route node is a TSN or a destination ASN; B. the first route node encapsulates the first data message as a second data message and transfers the second data message to the second route node; wherein, the destination address of the second data message is the route identifier of the second route node. The data communications system and method in the invention can improve transmission characteristic.

Description

Data communication system and method

Technical field

The present invention relates to the field of communications, and more particularly to a data communication system and method involving an identity location separation network architecture.

Background technique

3G and 4G are the core of research on next-generation networks in the field of wireless communications, aiming to improve the quality of wireless mobile communications based on all-IP packet core networks; Next Generation Network (NGN) and Next-Generation Internet (Next-Generation Internet, NGI) is the study of next-generation network convergence in the telecommunications network and the Internet; China's Next Generation Internet (CNGI) aims to build a next-generation Internet based on IPv6; although various studies vary widely, A widely accepted view of the research is that the future network is a unified bearer network based on packets. Therefore, research on the next generation network architecture will use the Internet as the main reference. The Internet has maintained rapid development since its birth. It has become the most successful and most vital communication network. Its flexible and scalable, efficient packet switching, and powerful functions of the terminal are in line with the design needs of the new generation network. It will be the main reference blueprint for next-generation network design. However, the structure of the Internet is far from optimal, and there are many major design issues. In addition to the IP address space not meeting the application needs, it is mainly reflected in the following aspects:

The Internet was invented in the 1970s. It is difficult to predict that there will be a large number of mobile terminals and multiple township terminals in the world today. Therefore, the Internet protocol stack at that time was mainly designed for terminals connected in a "fixed" manner. In the current network environment, since the terminal basically does not move from one location to another, the transmitted address is the received address, and the path is reversible, so the IP address with dual attributes of identity and location can work very well. There is no conflict between the identity attribute of the IP address and the location attribute. The IP address also represents the identity and location that exactly met the network needs of the time. From the perspective of the network environment at the time, this design scheme is simple and effective, simplifying the hierarchy of the protocol stack. But there is no doubt that there is an internal contradiction between the identity attribute of the IP address and the location attribute. The identity attribute of an IP address requires that any two IP addresses be equal. Although the IP address can be assigned according to the organization, there is no necessary relationship between consecutively encoded IP addresses. There is no necessary relationship at least in the topological position; the location attribute of the IP address requires that the IP address be assigned based on the network topology (rather than the organization), and the IP addresses in the same subnet should be in a continuous In the IP address block, the IP address prefix in the network topology can be aggregated, thereby reducing the entries of the routing table of the router device and ensuring the scalability of the routing system.

With the development of network scale and technology, some technologies for dynamically assigning IP addresses have gradually emerged.

^Port Dynamic Host Configuration Protocol (DHCP), which begins to break the IP address uniquely represents a terminal's 4 settings. The use of private IP address space and the birth of Network Address Translator (NAT) technology continue to worsen the situation. In this case, the IP address with both the identity attribute and the location attribute will be difficult to continue to perform its role, and the dual attribute problem of the IP address has been highlighted. In addition to significant changes in technical requirements, the user status of the Internet has changed dramatically. In the first few years after the birth of the Internet, the Internet was basically used by people who are in a common group and trusted by each other. The traditional Internet protocol stack is also designed based on such a set of devices; the current Internet users are mixed, people It is difficult to continue to trust each other. In this case, the Internet, which lacks embedded security mechanisms, needs to change.

In general, the inherent contradiction between the dual attributes of IP addresses will lead to the following main problems:

1. Routing scalability issues.

There is a basic assumption about the scalability of Internet routing systems:

"The address is assigned according to the topology, or the topology is deployed according to the address, and the two must choose one." The identity attribute of an IP address requires that the IP address be assigned based on the organization to which the terminal belongs (rather than the network topology), and this allocation must be stable and cannot be changed frequently; the location attribute of the IP address requires the IP address to be based on the network. The topology is allocated to ensure the scalability of the routing system. In this way, the two attributes of the IP address create conflicts, which eventually leads to the scalability problem of the Internet routing system.

2. Mobility issues.

The identity attribute of the IP address requires that the IP address should not change as the location of the terminal changes. This ensures that the communication bound to the identity is not interrupted, and that the terminal can still use its identity after the terminal is moved. Establish a communication link; the location attribute of the IP address requires IP The address changes as the location of the terminal changes, so that the IP address can be aggregated in the new network topology, otherwise the network must reserve separate routing information for the mobile terminal, resulting in a sharp increase in routing table entries.

3. A number of township issues.

Multiple townships usually refer to terminals or networks that pass through multiple Internet providers at the same time (Internet Service)

Provider, ISP) network access to the Internet. The advantages of multiple township technologies include increasing network reliability, supporting traffic load balancing across multiple ISPs, and increasing overall available bandwidth. However, the inherent contradiction between the dual attributes of IP addresses makes it difficult to implement multiple township technologies. The identity attribute of an IP address requires that a plurality of home terminals always display the same identity to other terminals, regardless of whether the multiple township terminals access the Internet through several ISPs; and the location attribute of the IP address requires that multiple township terminals are different. The ISP network uses different IP addresses to communicate, so that the IP address of the terminal can be aggregated in the topology of the ISP network.

4. Security and location privacy issues.

Since the IP address contains both the identity information and the location information of the terminal, both the communication peer and the malicious eavesdropper can simultaneously obtain the identity information and the topology location information of the terminal according to the IP address of the terminal.

In general, since the establishment of the traditional Internet architecture, the technical environment and user community of the Internet have undergone earth-shaking changes, and the Internet needs to be innovated. The dual attribute problem of IP address is one of the root causes that plague the Internet. It is a good idea to solve the problem faced by the Internet by separating the identity attribute and location attribute of the IP address. The new network will be designed based on this idea, and propose a network structure in which identity information and location information are separated to solve some serious drawbacks of the existing Internet.

In order to solve the problem of identity and location, the industry has carried out a lot of research and exploration. The basic idea of all identity and location separation schemes is to separate the identity and location dual attributes originally bound to the IP address. Some of the schemes use the Uniform Resource Locator (URL) of the application layer as an identification method for completely describing the addresses of web pages and other resources on the Internet, or a Fully Qualified Domain Name (FQDN). As the identity of the terminal, etc.; some schemes introduce a new namespace as an identity, such as the Host Identity Protocol (HIP) to add hosts on the network layer identified by the IP address. Identification; Some schemes classify IP addresses, some IPs are used as identity identifiers, and some IPs are used as location identifiers. For example, the Locator/ID Separation Protocol (LISP) uses an endpoint identifier (EID) as an identity identifier. Routing Locator (RID) as a route identifier, etc.

The most representative one is a network-based solution. The core idea is to divide the network into two parts, one part is the transmission network or the forwarding network, which is located at the center of the whole network; the other part is the edge network or the access network. The access service node is connected to the forwarding network; wherein the address space and routing information of the access network and the forwarding network are isolated from each other.

As shown in FIG. 1 , the network-based identity location separation scheme divides the dual functions of the traditional IP address into an identity identifier (Access ID, AID) and a route identifier (Rate ID, RID), and the AID functions as an identity identifier of the end host. The domain is in the access network; the RID is the route identifier of the end host, and the scope is in the forwarding network; the access service node (ASN) completes the registration and query of the mobile terminal AID and RID in the mapping server, and accesses the service node. The ASN can also be called an Access Service Router (ASR).

When the mobile terminal initiates communication to the communication peer end (Correspondent Node, CN), the access service node ASN initiates a location query process to the identity location mapping server, and queries the route identifier of the current location information of the destination terminal, and returns the source identifier to the source terminal. Enter the service node to ensure that it can initiate a communication connection correctly.

ASN: Access Service Node, access service node. The ASN maintains the connection relationship between the mobile terminal and the network, allocates the RID to the mobile terminal, processes the handover process, processes the registration process, charges/authenticates, and maintains/queries the AID-RID mapping relationship of the communication peer.

The ASN encapsulates, routes, and forwards the data packets sent by the terminal or the terminal. When receiving the data packet sent by the source terminal, the ASN queries the AID-RID mapping table in the local cache table according to the communication peer AID in the packet: finds the corresponding AIDc-RIDc mapping entry, and encapsulates the RIDc in the packet. The header is forwarded to the forwarding network; the corresponding AIDc-RIDc mapping entry is not found, and the process of querying the AIDc-RIDc mapping relationship is sent to the mapping forwarding plane.

The ASN decapsulates, and the ASN receives the encapsulated packet from the forwarding network to the terminal to which the ASN belongs, performs decapsulation processing, and restores the packet with the AID address to the terminal. GSR: General Switch Router, Universal Switch Router. Routes and forwards data packets with the RID as the destination address.

The main function of the forwarding network is to select and forward data packets based on the route identifier RID in the data packet.

The main function of the mapping server is to save the mapping information of the AID-RID of the mobile node, process the registration process of the mobile node, and process the location query process of the communication peer.

In the above solution, the forwarding network is composed of a plurality of general switching routers GSR, and performs routing and forwarding of data packets according to the routing identifier RID in the data packet. GSR uses Internet protocols such as Routing Information Protocol (RIP) and Open Shortest Path First (OPSF) for routing processing. There are some problems. The above solution is more suitable for non-real-time services of the Internet. The "best effort transmission" feature of the forwarding network can be satisfied, but the real-time service of the mobile communication network guarantees the transmission delay, the transmission delay jitter, and the transmission bandwidth. The forwarding network needs to ensure good transmission characteristics, which is embodied in the network transmission. The deterministic nature of the path, flexible scheduling of transmission traffic, etc., if the existing Internet routing resource reservation and process engineering protocols are used to complete, all routers that need to upgrade and improve the forwarding network need to be upgraded and costed. It is obviously inappropriate to modify the entire forwarding network for a class or a new type of service. Therefore, a new data communication system and method are needed to solve this problem.

The technical problem to be solved by the present invention is to provide a data communication system and method for improving transmission characteristics.

In order to solve the above technical problem, the present invention provides a data communication system, which is implemented based on an identity location separation architecture network, including a source access service node (ASN), a forwarding service node (TSN), a destination ASN, and a network connection. Mapping server, where:

The source access service node (ASN) and the forwarding service node (TSN) are configured to: receive the data packet, and obtain the matching next route on the forwarding path from the local cache or the mapping server according to the source and destination addresses in the received data packet. The route identifier of the node; also processes the received data packet as the destination The address is the data packet of the routing identifier of the next routing node, and the data packet is forwarded to the next routing node, where the next routing node is the destination ASN or TSN;

The mapping server is configured to: store mapping information, where the mapping information includes a mapping relationship between an identity (AID) of the terminal and a route identifier (RID), and forwarding path information between the source ASN and the destination ASN, and according to the The source ASN and TSN query requests match the forwarding path to return the query result.

Preferably, the source ASN and the TSN include a message receiving module, a mapping information query module, a cache module, a message processing module, and a message sending module, where:

The message receiving module is configured to: receive a data message sent by the terminal or the previous routing node; the routing node refers to a source ASN or a TSN;

The mapping information querying module is connected to the packet receiving module, and is configured to: query the cache module according to the source and destination addresses of the data packet, or query the mapping server to obtain a routing identifier of the next routing node that obtains the matching forwarding path;

The cache module is connected to the mapping information query module, and is configured to: establish and save local mapping information according to the query result of the mapping information query module or the mapping information actively sent by the mapping server, where the local mapping information includes an AID-RID mapping relationship and/or Or forwarding path information;

The message processing module is configured to be connected to the mapping information query module and the message receiving module, and configured to: process the data packet received by the packet receiving module, and the destination address of the processed data packet is the next route. The RID of the node;

a packet sending module is connected to the packet processing module, and configured to: send the data packet processed by the packet processing module;

The mapping relationship entry in the mapping server is associated with or associated with the forwarding path information entry.

Preferably, the packet receiving module of the source ASN is configured to: the received data packet is a data packet sent by the source terminal, where the source and destination addresses in the data packet are the identity of the source and destination terminals respectively (AID) The cache module of the ASN is further configured to: the cached local mapping information includes a mapping relationship between AID and RID, and forwarding path information, where the mapping relationship entry is associated with or associated with the forwarding path information entry; The data packet processing module is also configured to: perform a message office The identity of the source and destination terminals is encapsulated in the data packet.

Preferably, when the mapping information querying module of the ASN queries the mapping server, the query request sent includes the source terminal identifier and the AID of the destination terminal; and the mapping information query module of the TSN is set to: When the server queries, the sent query request carries the source terminal identifier, the RID of the current TSN, and the AID of the destination terminal, where the source terminal identifier refers to the AID or RID of the source terminal.

Preferably, the mapping server is further configured to: when returning the query result to the ASN, send the mapping information to the TSN of the matching forwarding path, where the mapping information that is sent includes at least the source terminal identifier, the RID of the next routing node, and the destination. The AID of the terminal is further configured to: the cached mapping information entry includes at least the source terminal identifier, the AID of the next routing node, and the AID of the destination terminal, and the identifier of the source terminal is the AID or RID of the source terminal.

In order to solve the above technical problem, the present invention also provides a data communication method, which is implemented based on a data communication system of an identity location separation architecture, where the system presets a forwarding path, and the method includes:

After receiving the first data packet, the first routing node obtains, according to the source and destination addresses in the first data packet, the next routing node, that is, the second routing node, of the first routing node on the matching forwarding path. Route identifier, where the first routing node is a source access service node (ASN) or a forwarding service node (TSN), and the second routing node is a TSN or a destination ASN;

B. The first routing node encapsulates the first data packet into a second data packet, the destination address of the second data packet is a route identifier of the second routing node, and forwards the foregoing to the second routing node. Two data messages.

Preferably, in step A, when the first routing node is a source access service node (ASN), the first data packet received is a data packet sent by the source terminal, and the source and destination are in the first data packet. The address is the identity of the source and the destination terminal (AID). In the step B, the source ASN encapsulates the identity of the source and destination terminals in the second data packet.

Preferably, the step A further includes: the first routing node matching the forwarding path according to the mapping information of the local cache to obtain the routing identifier of the second routing node, or querying the mapping server storing the mapping information, and then forwarding by the mapping server After the path is matched, the route label of the second routing node is delivered. Knowledge.

Preferably, in step A, when the first routing node is the source ASN, the source ASN queries the mapping server for the routing identifier of the second routing node, and the sent query request carries the source terminal identifier and the AID of the destination terminal; The first route and the node are TSNs. When the TSN queries the mapping server for the route identifier of the second routing node, the query request is sent with the identifier of the source terminal, the RID of the current TSN, and the AID of the destination terminal. The identifier of the terminal refers to the AID or RID of the source terminal.

Preferably, the step A further includes: in the data communication system, after the mapping server receives the forwarding path query of the source ASN, the mapping server sends the matching mapping information to the source ASN and the other associated TSNs, and sends the matching mapping information to each TSN. The mapping information includes at least the identifier of the source terminal, the RID of the next routing node, and the AID of the destination terminal, and the identifier of the source terminal refers to the AID or RID of the source terminal.

In order to solve the above technical problem, the present invention further provides another data communication method, which is implemented based on a data communication system of an identity location separation architecture, where the system presets a forwarding path, and the method includes:

A. The source access service node (ASN) receives the data packet sent by the source terminal, where the source and destination addresses in the data packet are the source and destination identity (AID) of the destination terminal;

The source ASN obtains the route identifier of the next routing node in the matching forwarding path according to the source and destination addresses of the received data packet, and the source ASN processes the received data packet, and the processed data packet is processed. The destination address of the data packet is the route identifier of the next routing node, and the processed data packet is forwarded to the next routing node. If the next routing node is the forwarding service node (TSN), step C is performed. If the routing node is the destination ASN, perform step D;

After receiving the data packet sent by the previous routing node, the TSN obtains the routing identifier of the next routing node of the matching forwarding path according to the destination address, and converts the destination address in the packet into the next routing node. Route ID, and forward the processed data packet to the next routing node; perform this step cyclically until the next routing node is the destination ASN, and perform step D;

D. If the next routing node is the destination ASN, the destination ASN restores the source and destination addresses of the data packet to the source and destination end identifiers after receiving the data packet, and sends the identifier to the destination terminal. Forward the restored data packet.

Preferably, step B or C further comprises: mapping the source ASN or TSN according to a local cache After the information is matched with the forwarding path, or the mapping server that stores the mapping information is queried, the mapping server performs the forwarding path matching and then delivers the routing identifier of the next routing node.

Preferably, in the data communication system, after receiving the forwarding path query of the source ASN, the mapping server for storing the mapping information sends the matching mapping information to the source ASN and the TSN associated with the forwarding path, and sends the mapping information to the mapping information. The mapping information of each source TSN includes at least the identifier of the source terminal, the route identifier of the next routing node, and the AID of the destination terminal. The identifier of the source terminal refers to the AID or RID of the source terminal.

A service node of a data communication system, applied to a system based on an identity location separation architecture network,

The service node is configured to: process the received data packet into a data packet whose destination address is the route identifier of the next routing node, and forward the data packet to the next routing node;

The service node is a first serving node or a second serving node, and the next routing node is a third serving node or a second serving node.

Preferably, the service node is further configured to: obtain, according to the source and destination addresses in the received data packet, a route identifier of a next routing node on the matching forwarding path from the local cache or the mapping server;

The matching forwarding path is sent by the mapping server to the service node, and the mapping server stores mapping information, where the mapping information includes a mapping relationship between the identity identifier (AID) of the terminal and the routing identifier (RID), and a preset first Forwarding path information between the service node and the third serving node.

Preferably, the first serving node or the second serving node includes a message receiving module, a mapping information query module, a cache module, a message processing module, and a message sending module, where:

The message receiving module is configured to: receive a data message sent by the terminal or the previous routing node; the routing node refers to the first service node or the second service node;

The cache module is connected to the mapping information query module, and is set as: querying the module according to the mapping information And the local mapping information is established and saved by the mapping result or the mapping information actively sent by the mapping server, where the local mapping information includes an AID-RID mapping relationship and/or forwarding path information;

The packet sending module is connected to the packet processing module, and configured to: send the data packet processed by the packet processing module.

Preferably, the mapping relationship entry in the mapping server is associated with or associated with the forwarding path information entry.

Preferably, the packet receiving module of the first serving node is configured to: the received data packet is a data packet sent by the source terminal, where the source and destination addresses in the data packet are the identity of the source and destination terminals respectively. Identification (AID).

Preferably, the cache module of the first serving node is further configured to: the cached local mapping information includes a mapping relationship between the AID and the RID, and forwarding path information, where the mapping relationship entry is associated with the forwarding path information item or is associated with the sub-setting ;

Preferably, the data packet processing module of the first serving node is further configured to: encapsulate the identity identifiers of the source and destination terminals in the data text when performing packet processing.

Preferably, the mapping information querying module of the first serving node is configured to: when querying the mapping server, the sending query request carries the source terminal identifier and the AID of the destination terminal.

Preferably, the mapping information querying module of the second serving node is configured to: when querying the mapping server, the query request sent includes the source terminal identifier, the RID of the current second serving node, and the AID of the destination terminal. The source terminal identifier refers to the AID or RID of the source terminal.

Preferably, the first serving node is a source access service node (ASN), the second serving node is a forwarding service node (TSN), and the third serving node is a destination ASN.

A mapping server is applied to a system implemented based on an identity location separation architecture network. The mapping server is configured to: store mapping information, where the mapping information includes a mapping relationship between an identity identifier (AID) and a routing identifier (RID) of the terminal, and a preset The forwarding path information between the source ASN and the destination ASN, and the matching forwarding path return query according to the query request of the source ASN and the TSN The result.

In the data communication system and method of the present invention, a forwarding path is preset in a network of an identity location separation architecture, and a routing node such as an Access Service Node (ASN) and a Forward Service Node (TSN) forwards a datagram. Before the text, the route identifier of the next routing node on the matching forwarding path is obtained, and then the data packet is forwarded to the next routing node. The present invention provides a certain forwarding path and flexible traffic scheduling between the identity location separation networks, and satisfies real-time performance. High-speed mobile communication service forwarding requirements only need to increase the TSN node, and it is not necessary to upgrade and improve all the routers of the forwarding network to meet future service requirements, and the transmission characteristics of the network can be improved.

BRIEF abstract

Figure 1 Schematic diagram of the composition of the network architecture with identity and location separation;

2 is a schematic diagram of a network architecture of a data communication system according to the present invention;

3 is a schematic flow chart of a data communication method of the present invention;

4 is a schematic flow chart of an application example of the data communication method of the present invention;

FIG. 5 is a schematic diagram of a process in which a source ASN initiates a query to a mapping server according to the present invention. Preferred embodiment of the invention

The main idea of the data communication system and method of the present invention is to pre-set a forwarding path in a network of an identity location separation architecture, and a routing node such as an Access Service Node (ASN) and a Forward Service Node (TSN) Before forwarding data packets, first obtain The routing identifier of the next routing node on the matching forwarding path is taken, and the data packet is forwarded to the next routing node. The present invention provides a certain forwarding path and flexible traffic scheduling between the identity location separation networks, and meets the requirements of high real-time mobility. The forwarding requirements of the communication service only need to increase the TSN node, and it is not necessary to upgrade and improve all the routers of the forwarding network to meet future business requirements.

The data communication system of the present invention is a communication system under the identity location separation network architecture, and the system is composed of an access service node ASN, a forwarding service node TSN and a mapping server.

As shown in Fig. 2, in the data communication system of the present invention, the ASN and the TSN are the names of two or more network entities having the same function.

The main functional entities of the system are defined as follows:

ASN: Access Service Node, access service node. The ASN is used to maintain the connection between the terminal and the network, assign the RID to the terminal, maintain/query the AID-RID mapping relationship of the communication peer, and also encapsulate the data packets sent by the terminal and receive the service ASN from the forwarding network. The encapsulated packet of the terminal is decapsulated and restored to the AID address and sent to the terminal.

When receiving the data packet sent by the terminal, the ASN queries the local mapping information (including the AID-RID mapping relationship and the preset forwarding path information) according to the communication peer AIDc in the packet: The corresponding local mapping information is found. The RIDc is encapsulated in the packet header and forwarded to the forwarding network. The corresponding local mapping information is not found, and a query request is sent to the mapping server to obtain the AIDc-RIDc mapping relationship and the RID or communication of the first forwarding service node TSN on the forwarding path. The RID of the peer is added to the local cache.

TSN: Transfer Service Node, the forwarding service node, the TSN is a forwarding path node in the forwarding network, configured to receive mapping information sent by the mapping server or query mapping information to the mapping server; and also to maintain local mapping information for forwarding network data communication, The route identifier of the routing node on the forwarding path is converted according to the forwarding path, and the route identifier RID in the destination address in the forwarding packet is converted into the RID of the next forwarding path node.

In the present invention, both the ASN and the TSN have a routing and forwarding function, which is collectively referred to as a routing node. It is understood that the source ASN and the destination ASN are respectively the first routing node and the last routing node, and the first forwarding service node TSN1 on the forwarding path The last routing node is the source access service node ASNs, the next routing node of the last forwarding service node is the destination access service node ASNd. In connection with the present invention, the source ASN and the TSN have the following in common:

The method is configured to receive a data packet, and obtain a route identifier of a next routing node on the matching forwarding path from the local cache or the mapping server according to the source and destination addresses in the received data packet, and also process the received data packet as a destination. The address is a data packet of the route identifier of the next routing node, and the data packet is forwarded to the next routing node. For the source ASN, the next routing node is the TSN or the destination ASN, and for the TSN (k), the next routing node is the TSN (k+1) or the destination ASN.

The route identifier of the source ASN refers to the RID of the source terminal.

Specifically, the ASN and the TSN include a message receiving module, a mapping information querying module, a buffering module, a message processing module, and a message sending module. When the ASN is a source ASN, the functions of the modules and the TSN are as follows:

The message receiving module is configured to receive the data packet sent by the terminal or the previous routing node; for the path direction from the source terminal to the destination terminal, the source ASN does not have the previous routing node, and the previous route of the TSN (k) The node is the source ASN or TSN(kl);

The mapping information querying module is configured to be connected to the receiving module, and configured to query the cache module according to the source and destination addresses of the data packet or query the mapping server to obtain a routing identifier of the next routing node that matches the forwarding path;

a cache module, configured to be connected to the mapping information query module, configured to establish and save local mapping information according to the query result of the mapping information query module or the mapping information delivered by the mapping server;

The packet processing module is configured to be connected to the mapping information querying module and the packet receiving module, and configured to process the data packet received by the packet receiving module, and the destination address of the processed data packet is the next routing node. RID;

The packet processing module of the TSN replaces the destination address of the received packet (ie, the RID of the local node) by using the RID of the next routing node; and the packet processing module of the source ASN does not change the received packet, and uses the source. The RID of the terminal and the RID of the next routing node are outer-encapsulated.

a packet sending module, configured to be connected to the packet processing module, configured to send the data packet processed by the packet processing module;

The difference between the source ASN and the TSN is: the number received by the packet receiving module of the source ASN. The packet is from the terminal, and the source and destination addresses of the packet are respectively the identity of the source and destination terminals. The cache module of the ASN is further configured to cache the mapping relationship between the AID and the RID, and the mapping relationship entry and the forwarding The path information entries are concatenated or associated with each other; when the data packet processing module of the ASN performs packet processing, the identity identifiers of the source and destination terminals are encapsulated in the data packets.

The destination ASN includes a packet receiving module, a packet processing module, and a packet sending module, wherein the data packet received by the packet receiving module is a data packet sent by the last TSN; and the data packet processing module decapsulates the data packet. The source and destination addresses of the data packet are restored to the identity of the source and destination terminals. The packet sending module sends the decapsulated data packet to the destination terminal.

The main function of the mapping server is to save the mapping information of the mobile node, process the registration process of the mobile node, process the routing identifier query process of the communication peer, and provide services for the route query of the ASN and the TSN. The mapping information includes an AID-RID mapping relationship and forwarding path information, and the forwarding path information is a routing identifier of each routing node on the data forwarding path. Therefore, the forwarding path information includes at least the route identifier of the source terminal and the route identifier RID of the destination terminal.

Mapping information query: When the source ASN queries the mapping server to query the communication peer (the destination terminal of the communication), the query packet includes the identity identifier AID of the communication peer, and the mapping server performs query processing, if the mapping information of the mapping server includes the forwarding service node. The mapping server returns a query response message to the ASN, which includes the route identifier RID of the first forwarding service node of the matching forwarding path. Preferably, the mapping server also sends the mapping information to the TSNk of the matching forwarding path. The mapping server actively sends the source terminal routing identifier and the routing identifier of the next routing node, and simultaneously delivers the identity of the destination terminal; if the mapping information of the mapping server does not forward the service node information, the ASN is returned to the ASN including the communication peer. The query response message of the route identifier RID. The mapping server also receives the query of the forwarding path of the TSN, and returns the routing identifier RID of the forwarding service node of the forwarding path.

Setting of the forwarding path: The mapping server plans a forwarding path according to the requirements of the data communication service, and the forwarding path is composed of the source ASN, the first forwarding service node TSN1, and the second forwarding service node TSN2. . . The mth forwarding service node TSNm and the destination ASN are composed. The forwarding path starts from the source ASN, the next forwarding service node is TSN1, and the next forwarding service node is TSN2, and the next forwarding service node of the mth forwarding service node TSNm is the destination. ASN, destination ASN is the last node of the forwarding path. It can be understood that the source ASN is the source ASN's route identifier. The source ASN is the source terminal's route identifier. The term "source ASN route identifier" is used in this paper only to facilitate the unified description of the source ASN and the forwarding service node. , hereby explain.

The mapping information processing of the mapping server includes the following aspects:

(1) Establish a forwarding path

Establishing a forwarding path of the data communication in the mapping server, where the forwarding path includes the routing identifier RIDs of the source terminal, the routing identifiers RID1-m of the m forwarding service nodes TSN1-m, and the routing identifier RIDd of the destination terminal, and adds the forwarding path information to In the mapping information, the existing mapping information is a mapping relationship between the identity identifier AIDd of the destination terminal and the routing identifier RIDd of the destination terminal. The ASN can query the routing identifier RID of the destination terminal according to the identity identifier AID of the destination terminal, and add the forwarding path information. The mapping information is (the routing identifier RIDs of the source terminal, the identity identifier AIDs of the destination terminal, the routing identifier RID 1-m of the forwarding service node, and the routing identifier RIDd of the destination terminal).

The following gives the representation of the two mapping information:

Manner 1: The mapping relationship is combined with the forwarding path, that is, the mapping information table includes a forwarding path. Its basic form is as follows:

According to the above table, the mapping server uses the identity identifier AIDd of the destination terminal to query the routing identifier RIDd of the destination terminal, or uses the routing identifier RIDs of the source terminal and the identity of the destination terminal to query the routing identifier of the routing node of the forwarding path.

Another form of mapping information table forwarding path, the forwarding path is sequential, and the basic order is: route identifier RIDs of the source terminal, route identifier RID1 of the first forwarding service node TSN1, and route identifier RID2 of the second forwarding service node TSN2 , . . . , the mth forwarding service node TSNm routing identifier RIDm, the destination terminal routing identifier RIDd.

Method 2: Mapping relationship table and forwarding path information table are associated The mapping relationship table includes the mapping relationship between the identity identifier of the terminal and the route identifier. The forwarding path information table includes the route identifier RIDs of the source terminal (ie, the source ASN), the route identifier RIDd of the destination terminal (ie, the destination ASN), and the sequence of the forwarding path. The routing identifier of each forwarding service node TSN. The basic sequence is: the route identifier RIDs of the source terminal, the route identifier RID 1 of the first forwarding service node TSN1, and the route identifier RID2 of the second forwarding service node TSN2. . . The mth forwards the route identifier RIDm of the service node TSNm, and the route identifier RIDd of the destination terminal.

The mapping server obtains the routing identifier RIDd of the destination terminal according to the query mapping table of the source ASNs, and then queries the forwarding path information table according to the routing identifier RIDs of the source terminal and the routing identifier of the destination terminal, thereby obtaining the next routing node. If the matching forwarding path is not found in the forwarding path information table, the default is that the forwarding path is not specified or forwarded from the RIDs to the RIDd without using the TSN.

In order to improve the efficiency of the query forwarding path information table, the following methods can also be used:

Manner 3: The forwarding path label is set in the mapping information table, and indicates whether the forwarding path information table needs to be queried when sending the data packet to the corresponding destination terminal.

When the value of the forwarding path flag i is equal to 0 (i=0), it means that there is no forwarding path or no specified forwarding path; non-zero (i≠0) means that there is a forwarding path information table, and further query forwarding path information table is needed. .

The forwarding path information table contains information about the forwarding path. The basic form is as follows:

The route identifier RIDs of the source terminal, the route identifier RID1 of the first forwarding service node TSN1, and the route identifier RID2 of the second forwarding service node TSN2. . . , mth forwarding service node TSNm routing identifier RIDm, destination terminal routing identifier RIDd.

(2) Mapping query processing on source access service node ASNs

The mapping server receives the mapping query request message of the source access service node ASNs, and the mapping query request message includes the identity identifier AIDd of the destination terminal and the RIDs or mapping query of the source ASNs. The request message includes the identity identifiers AIDs and AIDds of the source and destination terminals, and the mapping server queries the mapping information and returns a response message.

If there is a TSN in the forwarding path of the matched mapping information, the response packet includes the RID1 of the first forwarding service node and the routing identifier RIDd of the destination terminal in the matching mapping information; and the mapping server sends the mapping information of the data communication to the mapping server. The other forwarding service node on the forwarding path, preferably, the mapping server actively sends the routing identifier of the source terminal, the routing identifier of the next routing node, and simultaneously delivers the identity identifier of the destination terminal, so that the forwarding service node receives the data packet. Then, the mapping information that is actively sent by the cached mapping server matches the unique forwarding path, and the processing and packet forwarding are performed quickly.

If there is no TSN in the forwarding path of the matched mapping information, the routing identifier RIDd of the destination terminal included in the response packet is used.

(3) Forwarding path query processing of forwarding service node TSNk

Generally, after the mapping server actively sends the mapping information, the forwarding service node can match the unique forwarding path according to the mapping information actively sent by the mapping server of the local cache, obtain the routing identifier of the next routing node, and process the packet quickly. And the packet forwarding; but in the actual application process, the forwarding path query may be initiated by the forwarding service node to the mapping server according to whether the mapping server delivers the mapping information comprehensively or other policies.

The mapping server receives the forwarding path query message of the forwarding service node TSNk, and the packet includes the route identifier RIDs of the source ASNs and the route identifier RIDk of the TSNk and the identity identifier AIDd of the destination terminal, and the mapping server queries the mapping information, and returns a response packet. , at least the routing identifier RID ( k+ 1 ) of the next routing node in the matching mapping information.

The processing flow of ASN, including:

(1) The ASN processes the received message sent by the source terminal.

The source ASN receives the packet sent by the source terminal. The format of the address in the packet is: (identity ID of the destination terminal, AIDd, identity identifier of the source terminal, AIDs)

The source ASN obtains the route identifier of the next routing node.

The source ASN can obtain the route identifier of the next routing node in the following two ways: Mode 1: The source ASN queries the local cache according to the AIDd of the destination terminal to obtain the next route. The route identifier RIDn of the node (RID1 of the first forwarding service node or the RIDd of the destination terminal); Method 2: If the query local mapping table does not have a matching entry, the ASNs sends a mapping query request message to the mapping server, and the mapping query request message includes the destination. The identity identifier AIDd of the terminal and the RIDs of the source ASNs, the mapping server returns a mapping information query response message, where the response message includes a route identifier RIDn of the next routing node (RID1 of the first forwarding service node or RIDd of the destination terminal), The source ASNs add the route identifier to the local mapping information table for use by the ASNs to encapsulate the packets sent by the source terminal.

The source ASN encapsulates the received packet according to the obtained route identifier of the next routing node RIDn and the route identifier RIDs allocated to the source terminal, and then forwards the packet through the forwarding network.

The address format of the encapsulated packet is two layers, and the inner address format is (the destination terminal

AIDd, AIDs of the source terminal; the outer address format of the encapsulation is

(Routing route ID of the next routing node, RIDs of the source terminal)

The ASN receives the packet processing from the forwarding network to the destination terminal:

The destination ASNd receives the packet sent by the forwarding network. The format of the packet is: (the destination terminal's route identifier RIDd, the source terminal's route identifier RIDs) (the destination terminal's identity identifier AIDd, the source terminal's identity identifier AIDs); The ASNd decapsulation process removes the outer address of the encapsulated packet - the route identifier, and retains the inner address. The format of the packet after decapsulation is: (identity identifier AIDd of the destination terminal, identity identifier AIDs of the source terminal); ASNd The decapsulated packet is sent to the destination terminal, and the province identifier of the destination terminal is AIDd.

The TSN processes the received data message:

The TSNk receives the packet sent by the previous routing node (k-1) of the forwarding path through the forwarding network. The format of the packet address is:

(RIDk, RIDs) (identity of the destination terminal AIDd, identity of the source terminal AIDs)

The TSNk queries the local mapping information according to the RIDs in the outer address of the packet and the identity identifier AIDd of the destination terminal, and obtains the routing identifier RID (k+1) of the next routing node. If there is no matching entry in the local cache, the TSNk maps to the mapping. The server sends a mapping query request message, which includes a route identifier RIDk of the TSNk, a route identifier RIDs of the source terminal, and an identity identifier of the destination terminal, and the mapping server returns a mapping information query response message, where at least the route identifier of the next routing node is included; The TSNk performs address translation processing to convert the RIDk of the outer address of the received message to the route identifier RID (k+1) of the next routing node (k+1) on the forwarding path (the next routing node of the last forwarding service node on the forwarding path) For the purpose of accessing the service node ASNd), the packet is forwarded to the next forwarding service node on the forwarding path through the forwarding network. The address of the address translation packet is:

(RID ( k+1 ) , RIDs ) (identity of the destination terminal AIDd, identity identifier of the source terminal AIDs).

The TSN processes the information sent by the mapping server and the query response message:

The TSN receives the mapping information that is actively sent by the mapping server or the mapping information query response packet that is sent according to the query request of the TSN, and establishes a local mapping information table, where the mapping information table includes the routing identifier RIDs of the source ASNs, and the routing of the forwarding service node. The RIDk, the routing identifier RID (k+1) of the next routing node, and the identity of the destination terminal are used by the TSN for packet address translation processing. The address translation converts the destination address RIDk in the outer address of the received packet into RID( k+1 ).

In summary, the data communication method of the present invention is implemented based on a data communication system of an identity location separation architecture. The system presets a forwarding path. As shown in FIG. 3, the method includes:

Step 301: After receiving the first data packet, the first routing node obtains, according to the source and destination addresses in the first data packet, the next routing node, that is, the second route, of the first routing node on the matching forwarding path. The route identifier of the node, where the first routing node is a source access service node (ASNs) or a forwarding service node (TSN), and the second routing node is a TSN or a destination ASNd;

Step 302: The first routing node encapsulates the first data packet into a second data packet, where the destination address of the second data packet is a route identifier of the second routing node, and forwards the Second data message.

Further to expand, the method can also be described as:

A. The source access service node (ASN) receives the data packet sent by the source terminal, where the source and destination addresses are the source and destination terminal identity (AID);

The source ASN obtains the route identifier of the next routing node in the matching forwarding path according to the source and destination addresses of the received data packet, and the source ASN processes the received data packet, and the processed data packet is processed. The source and destination addresses of the data packet are the route identifier of the source terminal and the route identifier of the next routing node, and the processed data packet is forwarded to the next routing node; If the point is a forwarding service node (TSN), step C is performed, and if the next routing node is the destination ASN, step D is performed;

D. If the next routing node k is the destination ASN, the destination ASN restores the source and destination addresses of the data packet to the source and destination end identifiers after receiving the data packet, and sends the data identifier to the destination terminal. Forward the restored data packet.

Application example 1

If the data communication system sets the forwarding path of mobile terminal A (source terminal) to mobile terminal B (destination terminal):

ASNS-TSN1-TSN2-...TSN(k-l)-TSNk-TSN(k+l)... TSNm-ASNd, whose corresponding forwarding path information is:

RIDs-RIDl-RID2 - ...RID(k-l)-RIDk-RID(k+1) ...-RIDd.

As shown in FIG. 4, the flow of the data communication method includes:

Step 601: The source terminal initiates communication to the destination terminal, and sends a packet through the wireless network. The address format of the packet is:

(identity terminal AIDd, source terminal identity AIDs);

Step 602: The source ASNs receive the packet in step 601, and the source ASNs query the local cache according to the AIDd of the destination terminal, and obtain the route identifier RID1 of the first forwarding service node TSN1, and use the source ASNs to assign the route identifier RIDs to the source terminal. The received packet is encapsulated. The encapsulated packet is added with the outer address routing identifier. The address format is:

(RID1, RIDs) (identity identifier AIDd of the destination terminal, identity identifier AIDs of the source terminal) Step 603: The source ASNs forwards 602 encapsulated packets by forwarding the network;

Step 604: The first forwarding service node TSN1 receives the message of step 603, according to the RIDs and RID1 queries the local mapping information table, obtains the routing identifier RID2 of the next forwarding service node TSN2, performs address translation processing, and converts the destination address RID1 in the text into RID2. Step 605: TSN1 sends the address translation through the forwarding network. The format of the message, the address of the message is (RID2, RIDs) (the identity of the destination terminal AIDd, the identity of the source terminal AIDs);

Step 606: The forwarding service node TSNk receives the packet sent by the previous forwarding service node TSN (k-1) on the forwarding path, and queries the local mapping information table according to the RIDs and the RIDk to obtain the routing identifier RID of the next forwarding service node. +1), the address conversion processing of the message is performed, and the destination address RIDk in the message is converted into RID (k+1).

Step 607: The TSNk sends the address-converted packet through the forwarding network, and the address format of the packet is:

( RID ( k+1 ) , RIDs ) (identity of the destination terminal AIDd, identity identifier of the source terminal AIDs)

Step 608: The destination ASNd receives the packet, performs decapsulation processing, and removes the route identifier of the outer address. The address format of the encapsulated packet is

(identity of the destination terminal AIDd, identity of the source terminal AIDs)

Step 609: The destination ASNd sends the decapsulated packet through the wireless network, and the destination mobile terminal receives the packet.

The process of reverse communication can be analogized.

In step 602, the source ASNs query the local cache according to the AIDd of the destination terminal. If there is no entry of the destination terminal AIDd in the local cache, the mapping server needs to query the mapping server. The query process is as shown in FIG. 5:

701. The source ASNs sends a mapping information query message, where the packet includes a route identifier RIDs of the source terminal and an identity identifier AIDd of the destination terminal.

702. The mapping server processes the mapping information query message, and the query mapping information table, where the mapping information table includes a forwarding path, and the source access service node ASNs, the m forwarding service nodes TSN1-TSNm, To the destination access service node ASNd, the forwarding path is sequential. For example, the next routing node of the ASNs is the first forwarding service node, and the previous routing node of the destination access service node ASNd is the mth forwarding service node TSNm. It can also be said that the previous routing node of the first forwarding service node is an ASNs, and the next routing node of the mth forwarding serving node TSNm is the destination access service node ASNd, according to the routing identifier RIDs of the source terminal and the identity identifier AIDd of the destination terminal. Match the unique forwarding path;

703: The mapping server returns a mapping information query response message, where the message includes a routing path identifier RID 1 of the next forwarding node of the matching forwarding path;

704. The mapping server sends the mapping information to the other routing node that is associated with the forwarding path, that is, the forwarding service node. The mapping information that is delivered includes the following valid information: the RID of the source terminal, the RID of the next routing node, and the destination terminal. AID;

705. The source ASNs receive the mapping information query response packet, and establish a mapping entry of the destination terminal, and add the mapping entry to the local mapping information table. The mapping entry is (the AIDd of the destination terminal, and the routing identifier RID1 of the first forwarding service node, Destination terminal RIDd);

706. The forwarding service node TSNk receives the forwarding path sent by the mapping server, and establishes a local mapping information entry. The local mapping information includes at least the source terminal RIDs, the next routing node routing identifier RID (k+1), and the identity of the destination terminal. Identifies AIDd.

In the embodiment shown in FIG. 4, the source address of the data packet sent by the source ASN and the forwarding routing node TSN is the route identifier of the source ASN, and the source address may be the current data packet. The route identifier of the node is understood. The present invention mainly determines the next routing node according to the preset forwarding path, and changes the destination address of the data packet to implement packet routing, and does not pay attention to the representation manner of the source address. .

The main idea of the present invention is to preset a forwarding path according to service requirements, so that each routing node in the forwarding network forwards data packets according to a preset forwarding path. Based on the idea, the mapping server and each routing node store AID-RID mapping. The relationship between the relationship and the forwarding path information may be implemented in multiple manners. For example, the mapping server and each routing node may use the same identifier or sequence number to point to a forwarding path information, and the identifier or sequence number may be carried in the data packet, so that the identifier or sequence number may be carried in the data packet. The routing node that receives the data packet can quickly obtain the route identifier of the next routing node from the local cache or the mapping server matching forwarding path, and quickly forward the data packet. In the mapping information involved in the present invention, the mapping server needs to simultaneously store the forwarding path information and the mapping relationship that are set or separated, and the local mapping information of the ASN and the TSN can simultaneously store the forwarding path information and the mapping relationship that are set or separated. You can also save the mapping relationship or forwarding path information, and then obtain the forwarding path information or mapping relationship from the mapping server. You can also save the valid part of the mapping information locally. For example, the local mapping information in the ASN saves the source terminal AID and destination. The source AID and the RID of the next routing node, the source ASN can match the unique forwarding path according to the valid mapping information entry, obtain the RID of the TSN, and implement packet encapsulation and forwarding; the local mapping information entry of the TSN includes the source terminal RIDs, The next routing node route identifier, the destination terminal's identity AIDd.

The principle that the routing node (including the ASN and the TSN) requests the mapping server to carry the query and the local mapping information of each routing node to match the unique forwarding path, in the specific application of the present invention, may be based on the principle. The change is performed according to the mapping relationship and the specific embodiment of the forwarding path information. It can be understood that the root of the unique forwarding path is the identity of the source and destination terminals, and the identity and routing identifier of the source terminal are the same as the forwarding network when matching the forwarding path. If the source ASN performs the mapping information query to the mapping server, it can carry the source and destination terminal identifiers, and can also carry the source terminal's route identifier (that is, the source ASN completes the source terminal identity identifier). Mapping with the route identifier and the identity of the destination terminal; in the forwarding request of the forwarding service node, the local cache information, and the information sent by the mapping server, the routing identifier of the source terminal and the identity of the source terminal may be The replacement is made, so it can be understood to be summarized as the identity of the source terminal (ie identity or routing identity).

In the above embodiment, when the source ASN processes the data packet sent by the source terminal, it uses the Layer 2 encapsulation method to carry the source and destination terminal AIDs, which can be transformed, and can use the packet extension header (such as the destination option). Head) Bring the AID of the source and destination terminals to the destination ASN to implement data message restoration.

The method of the present invention can also be extended to inter-network communication. For inter-network communication, an Interconnect Service Node (ISN) connecting two networks is also substantially a forwarding route, and the forwarding routing node (TSN) of the present invention In this regard, the same is true. Therefore, it is understood that the TSN referred to in the present invention broadly includes an Interworking Service Node (ISN). Industrial Applicability The data communication system and method of the present invention pre-sets a forwarding path in a network of an identity location separation architecture, and a routing node such as an Access Service Node (ASN) and a Forward Service Node (TSN) Before forwarding the data packet, the route identifier of the next routing node on the matching forwarding path is obtained, and then the data packet is forwarded to the next routing node. The present invention provides a certain forwarding path and flexible traffic scheduling between the identity location separation networks. To meet the forwarding requirements of mobile communication services with high real-time requirements, only TSN nodes need to be added, and all routers that need to upgrade and improve the forwarding network can meet future service requirements, and the transmission characteristics of the network can be improved.

Claims

Claim

A data communication system, the system being implemented based on an identity location separation architecture network, comprising a source access service node (ASN), a forwarding service node (TSN), a destination ASN, and a mapping server connected by a network, wherein:

The source access service node (ASN) and the forwarding service node (TSN) are configured to: receive the data packet, and obtain the matching next route on the forwarding path from the local cache or the mapping server according to the source and destination addresses in the received data packet. a route identifier of the node; processing the received data packet as a data packet whose destination address is the route identifier of the next routing node, and forwarding the data packet to the next routing node, where the next routing node is Purpose ASN or TSN;

The mapping server is configured to: store mapping information, where the mapping information includes an identity of the terminal

The mapping relationship between the (AID) and the route identifier (RID) and the forwarding path information between the source ASN and the destination ASN, and the matching forwarding path according to the query request of the source ASN and the TSN.

2. The system of claim 1, wherein the source ASN and the TSN comprise a message receiving module, a mapping information query module, a cache module, a message processing module, and a message sending module, wherein: the message receiving module is configured. The data packet sent by the receiving terminal or the previous routing node; the routing node refers to the source ASN or TSN;

a message sending module, connected to the message processing module, configured to: send the message processing Data message processed by the module;

The system of claim 2, wherein the packet receiving module of the source ASN is configured to: the received data packet is a data packet sent by the source terminal, and the source and destination addresses in the data packet The AID cache module is further configured to: the cached local mapping information includes a mapping relationship between AID and RID and forwarding path information, and the mapping relationship entry and the forwarding path are The data entry processing module of the ASN is further configured to: encapsulate the identity of the source and destination terminals in the data packet when the packet processing is performed.

The system of claim 2, wherein the mapping information query module of the ASN is configured to: when querying the mapping server, the query request sent includes the source terminal identifier and the AID of the destination terminal; The mapping information querying module of the TSN is configured to: when querying the mapping server, the sending query request carries the source terminal identifier, the RID of the current TSN, and the AID of the destination terminal, where the source terminal identifier refers to the AID or RID of the source terminal. .

The system of claim 2, wherein the mapping server is further configured to: when the query result is returned to the ASN, the mapping information is sent to the TSN of the matching forwarding path, where the mapping information that is delivered includes at least the source terminal. The identifier, the RID of the next routing node, and the AID of the destination terminal; the cache module of the TSN is further configured to: the cached mapping information entry includes at least the source terminal identifier, the AID of the next routing node, and the AID of the destination terminal, and the source terminal Identifies the AID or RID of the source terminal.

6. A data communication method, the method being implemented based on a data communication system of an identity location separation architecture, the system pre-setting a forwarding path, the method comprising:

B. The first routing node encapsulates the first data packet into a second data packet, where the second number is The destination address of the packet is the route identifier of the second routing node, and the second data packet is forwarded to the second routing node.

The method of claim 6, wherein, in step A, when the first routing node is a source access service node (ASN), the received first data packet is a data packet sent by the source terminal. The source and destination addresses in the first data packet are the identity identifiers (AIDs) of the source and destination terminals respectively. In the step B, when the source ASN performs the packet encapsulation, the identity identifiers of the source and destination terminals are encapsulated in the first In the second data message.

The method of claim 7, wherein the step A further comprises: the first routing node matching the forwarding path according to the locally cached mapping information to obtain the routing identifier of the second routing node, or storing the mapping information After the mapping server is queried, the mapping server performs the forwarding path matching and then delivers the routing identifier of the second routing node.

The method according to claim 8, wherein, in step A, when the first routing node is a source ASN, when the source ASN queries the mapping server for the routing identifier of the second routing node, the query request is sent. Carrying the source terminal identifier and the AID of the destination terminal; the first route and the node are TSNs, and when the TSN queries the mapping server for the route identifier of the second routing node, the sent query request carries the identifier of the source terminal and the current TSN. The RID and the AID of the destination terminal, where the identifier of the source terminal refers to the AID or RID of the source terminal.

The method of claim 8, wherein the step A further comprises: in the data communication system, after the mapping server receives the forwarding path query of the source ASN, the mapping server delivers the query to the source ASN and other associated TSNs. The mapping information that is sent to each TSN includes at least the identifier of the source terminal, the RID of the next routing node, and the AID of the destination terminal. The identifier of the source terminal refers to the AID or RID of the source terminal.

11. A data communication method, the method being implemented based on a data communication system of an identity location separation architecture, the system pre-setting a forwarding path, the method comprising:

A. The source access service node (ASN) receives the data packet sent by the source terminal, where the source and destination addresses in the data packet are the identity identifier (AID) of the source and destination terminals;

B. The source ASN obtains a matching forwarding path according to the source and destination addresses of the received data packet. The route identifier of the next routing node in the path, the source ASN processes the received data packet, and the destination address of the processed data packet is the route identifier of the next routing node, and the next routing node Forwarding the processed data message; if the next routing node is a forwarding service node (TSN), step C is performed, and if the next routing node is the destination ASN, step D is performed;

The method of claim 11, wherein the step B or C further comprises: the source ASN or the TSN matching the forwarding path according to the locally cached mapping information, or querying the mapping server storing the mapping information by the After the mapping server matches the forwarding path, the routing identifier of the next routing node is delivered.

The method of claim 12, wherein the method further comprises: in the data communication system, after the mapping server for storing the mapping information receives the forwarding path query of the source ASN, the mapping to the source ASN and The TSN associated with the forwarding path delivers the matching mapping information, and the mapping information sent to each TSN includes at least the identifier of the source terminal, the routing identifier of the next routing node, and the AID of the destination terminal, where the identifier of the source terminal refers to the source terminal. AID or RID.

14. A service node of a data communication system, applied to a system based on an identity location separation architecture network,

The service node according to claim 14, wherein the service node is further configured to: obtain a matching switch from a local cache or a mapping server according to a source and a destination address in the received data packet. The routing identifier of the next routing node on the sending path; the matching forwarding path is sent by the mapping server to the serving node, and the mapping server stores mapping information, where the mapping information includes the identity identifier (AID) and the routing identifier (RID) of the terminal. a mapping relationship and forwarding path information between the first service node and the third serving node set in advance.

The service node according to claim 15, wherein the first serving node or the second serving node comprises a message receiving module, a mapping information querying module, a buffering module, a message processing module, and a message sending module, wherein :

The service node according to claim 16, wherein the mapping relationship entry in the mapping server is associated with or associated with the forwarding path information entry.

The service node according to claim 17, wherein the packet receiving module of the first serving node is configured to: the received data packet is a data packet sent by the source terminal, and the source of the data packet is The destination address is the identity of the source and destination terminals (AID).

The service node according to claim 18, wherein the cache module of the first service node is further configured to: the cached local mapping information includes a mapping relationship between AID and RID, and forwarding path information, where the mapping relationship entry is The forwarding path information entries are concatenated or associated.

The service node according to claim 19, wherein the data packet processing module of the first serving node is further configured to: encapsulate the identity identifiers of the source and destination terminals in the data packet when performing packet processing .

The service node according to claim 20, wherein the mapping information querying module of the first serving node is configured to: when querying the mapping server, the sending query request carries the source terminal identifier and the destination terminal AID.

The service node according to claim 21, wherein the mapping information querying module of the second serving node is configured to: when querying the mapping server, the sending query request carries the source terminal identifier, and the current second The RID of the serving node and the AID of the destination terminal, where the source terminal identifier refers to the AID or RID of the source terminal.

The service node according to claim 22, wherein the first serving node is a source access service node (ASN), the second serving node is a forwarding service node (TSN), and the third serving node is a destination ASN.

A mapping server, which is applied to a system implemented based on an identity location separation architecture network, where the mapping server is configured to: store mapping information, where the mapping information includes a mapping relationship between an identity identifier (AID) and a routing identifier (RID) of the terminal, and The forwarding path information between the source ASN and the destination ASN is preset, and the query result is returned according to the query request of the source ASN and the TSN.

The mapping server according to claim 24, wherein the mapping relationship entry in the mapping server is associated with or associated with the forwarding path information entry.

The mapping server of claim 25, wherein the mapping server is further configured to: when the query result is returned to the ASN, the mapping information is sent to the TSN of the matching forwarding path, and the mapping information that is delivered includes at least the source. The terminal identifier, the RID of the next routing node, and the AID of the destination terminal; the cache module of the TSN is further configured to: the cached mapping information entry includes at least the source terminal identifier, the AID of the next routing node, and the AID of the destination terminal, and the source terminal The identifier is the AID or RID of the source terminal.