WO2011079710A1

WO2011079710A1 - Worldwide interoperability for microwave access(wimax) system for implementing switching without fixed anchors and switching method for thereof

Info

Publication number: WO2011079710A1
Application number: PCT/CN2010/079739
Authority: WO
Inventors: 霍玉臻; 吴强; 符涛
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-12-31
Filing date: 2010-12-14
Publication date: 2011-07-07
Also published as: CN102118734B; CN102118734A

Abstract

A method and system for switching without fixed anchors in a Worldwide Interoperability for Microwave Access(Wimax) system are provided. The method includes: after a terminal accomplishes the switching of Wimax access service network anchors, a source access gateway(AGW) sends a AGW switching request to a target AGW; the target AGW assigns a new routing identifier(RID) for the terminal, and saves the mapping information between the access identifier(AID) of the terminal and the new RID; the target AGW initiates a RID registration flow, and updates the RID of the terminal saved by the home Identity Location Register(ILR) of the terminal, and sends an AGW switching response to the source AGW, and accomplishes the switching; the source AGW releases the resources assigned for the terminal, and the messages between the terminal and the opposite communication terminal are transferred via the target AGW. The technical scheme overcomes the problem that the accomplishment of the switching needs the support of fixed anchors in the existing WiMAX system.

Description

Wimax system capable of realizing unfixed anchor point switching and switching method thereof

Technical field

The present invention relates to a Worldwide Interoperability for Microwave Access (Wimax) system, and more particularly to a Wimax system capable of implementing unfixed anchor point switching and a handover method thereof. Background technique

In the traditional Transmission Control Protocol/Internet Protocol (TCP/IP) network environment, IP provides routing for the Internet, which assigns logic to all nodes, including hosts and routers. The address, which is the IP address, and each port of each host is assigned an IP address. The IP address includes the network prefix and the host part. The IP addresses of all hosts on the same link usually have the same network prefix and different host parts. This allows IP to be routed based on the network prefix portion of the destination node's IP address, allowing the router to maintain a simple network prefix route without having to maintain a separate route for each host. In this case, since the network prefix route is used, when the node switches from one link to another without changing its IP address, the node cannot receive the data packet on the new link. Therefore, it is impossible to communicate with other nodes.

Existing network technologies using the TCP/IP protocol have the following disadvantages:

支持 Support the mobility of the terminal by means of fixed anchor points, eg long term evolution (Long Term

Evlution, LTE) GPRS Tunneling Protocol (GTP) is used in the network.

GW) acts as the mobile anchor of the terminal; in the Wimax network, the Mobile IP protocol is used, and the Home Agent (HA) is used as an anchor point. The introduction of fixed anchor points brings about the problem of packet path rounding, which increases transmission delay and bandwidth waste. The route optimization process of MIPV6 requires the host participating in the communication to support the MIPV6 protocol, which is difficult to deploy.

The IP address has a dual function: the location identifier of the network interface of the communication terminal host as the network layer in the network topology, and the access identifier of the network interface of the transport layer host. When the host's IP address When a change occurs, not only the route needs to be changed, but also the access identifier of the communication terminal host changes, which causes the routing load to become heavier and heavy, and the change of the host identity causes the application and the connection to be interrupted.

The purpose of the access identification and location separation problem is to solve the problem of semantic overload and severe routing load of IP addresses, and to separate the dual functions of IP addresses to achieve dynamic redistribution and mitigation of mobility, multiple townships, and IP addresses. Support for issues such as routing load and mutual visits between different network areas in the next generation Internet. Existing identity and location separation frameworks HIP, LISP, etc. are a network framework built to overcome this deficiency of existing network technologies.

FIG. 1 shows another network architecture of identity and location separation (SILSN). The network topology of the SILSN architecture is divided into an access network and a backbone network with no overlapping relationships in the topology relationship, and the access network is located in the backbone network. The edge is responsible for the access of all terminals, and the backbone network is responsible for routing and forwarding data packets between terminals. In the network, the AID is used to indicate the user identity of the terminal, which is always unchanged during the terminal movement; the RID is used to indicate the location identifier assigned by the network to the terminal, and is used in the backbone network. It should be noted that the identity and location identifiers may have different names in different SILSN architectures and should be considered equivalent.

In the SILSN architecture, the terminal may be one or more of a mobile terminal, a fixed terminal, and a nomadic terminal, such as a mobile phone, a landline telephone, a computer, a server, and the like.

In the SILSN architecture, the access network is used to provide a Layer 2 (physical layer and link layer) access means for the terminal, and maintains a physical access link between the terminal and the ASN.

In the SILSN architecture, the main network elements of the backbone network include:

An access service node (ASN: Access Service Node) is used to allocate RIDs to terminals, maintain AID-RID mapping information of terminals, register and register RIDs of ILRs, and implement routing and forwarding of data packets. The ASN accesses the backbone network. The RID assigned by the ASN points to the ASN, that is, the address information of the ASN, and when the RID is used as the destination address of the data packet, the data packet will be routed to the ASN.

A general router (CR: Common Router) is used to select a route according to the RID in the data packet, and forward the data with the RID as the destination address.

ILR: Identity Location Register, ILR for saving and maintaining The identity identifier and location identifier mapping information of the home terminal, which is also written as AID-RID mapping information, and handles registration, cancellation, and query of the terminal location;

Optionally, the backbone network may further include:

The PTF (Packet Transfer Function), also known as the packet forwarding function node, is used to route and forward data packets with the AID as the destination address.

An Interworking Service Node (ISN) has interfaces with general-purpose routers, ASNs, and ILRs for interworking between two networks.

The above ILR, or ILR and PTF form the mapping forwarding plane of the backbone network, CR, or CR and ISN constitute the generalized forwarding plane of the backbone network. When communicating in the SILSN architecture, the ASN receives the uplink data packet for RID encapsulation and forwarding. Specifically, the RID of the communication peer is locally queried, for example, the RID of the communication peer is used as the destination address, and the terminal RID is used as the source address in the data packet including the terminal AID and the communication peer AID, and the generalized forwarding plane is used. Forward to the ASN of the communication peer. If the query is not available, the ILR of the communication peer is queried to the RID of the communication peer and stored locally. In this case, the RID of the terminal may be encapsulated in the packet, and then forwarded to the generalized forwarding plane through the mapping forwarding plane, or after the RID of the communication peer is queried, the ASN may locally query the RID of the communication peer according to the foregoing. The RID encapsulation and forwarding process is performed in a timely manner. In the downlink direction, the ASN receives the data packet sent from the generalized forwarding plane, performs RID encapsulation, strips the RID and sends it to the terminal.

It can be seen that in order to implement the normal forwarding of the message, the ASN needs to allocate the RID to the terminal when the terminal accesses, and needs to register the RID with the ILR to update the RID of the terminal in the ILR. The ASN also needs to maintain the AID-RID mapping information of the terminal and its communication peer to implement RID encapsulation of the message. In an example, the ASN maintains connection information (also referred to as communication relationship information) between the terminal and the communication peer for each terminal, where the connection information includes the correspondence relationship between the terminal AID and all communication peer AIDs, and may also include The AID-RID mapping information of the terminal, and the ASN uniformly maintains the AID-RID mapping information of the communication peer end of all terminals. Of course, it is also possible for the ASN to maintain the AID-RID mapping information of all communication peers for each terminal separately.

Figure 2 is the network architecture of the existing Wimax system. As shown in the figure, the prior art Wimax system The system generally consists of three parts: the terminal, the Wimax Access Service Network (W-ASN) and the Wimax Connect Service Network (W-CSN).

W-ASN mainly performs the following functions: Complete Layer 2 (L2) connection of WiMAX terminal, Pass Authentication, Authorization and Accounting (AAA) message to H-CSN (Home CSN), Network Service Operator (Network) Service Provider (NSP) network selection and discovery, relaying for Layer 3 (L3) connections of WiMAX terminals, radio resource management, tunnel maintenance between W-ASN and W-CSN. In the mobile scenario, W-ASN also needs to support the following functions: W-CSN Anchored MM, Idle Mode, and Idle Mode operation;

W-ASN is also used to manage the IEEE 802.16 air interface to provide wireless access to WiMAX end users. The W-ASN is composed of at least one base station (BS) and one access gateway (W-ASN Gateway, AGW), and may include a single AGW or multiple AGWs. The W-ASN interworks with the mobile station (MS) (collectively referred to as the terminal) at the R1 reference point, interworks with the W-CSN at the R3 reference point, and communicates with another W-ASN at the R4 reference point. The operator that manages the W-ASN is called the NAP (Network Access Provider).

W-CSN is a combination of network functions. W-CSN can be composed of HA, AAA proxy or server (AAA Proxy/Server), billing server, interconnection gateway device and so on. Among them, the operator that manages the W-CSN is called NSP.

W-CSN mainly provides the following functions: end user session connection, terminal IP address allocation,

Internet access, AAA proxy or server, end user policy and admission control, tunnel maintenance between W-ASN and W-CSN, end user billing and settlement, roaming between W-CSN, movement between W-CSN Sex management and WiMAX business.

among them:

The R1 interface is the interface between the terminal and the access gateway (also known as the reference point).

The R2 interface is the logical interface between the terminal and the W-CSN.

The R3 interface is an interface between the access gateway and the W-CSN. When roaming, the R3 interface is an interface between the access gateway and the visited W-CSN. The R4 interface is the interface between the access gateways.

The R5 interface is the interface between the W-CSN and the home W-CSN when roaming.

R6 interface ^^ The interface between the station and the access gateway.

The R8 interface is the interface between base stations.

There are two types of handovers in existing WiMAX systems: W-ASN anchored handover and W-CSN anchored handover;

The W-ASN anchored handover is anchored by the anchor access gateway including the anchor data channel function (DPF), and the terminal switches from the source base station to the target base station at the time of handover, and the source anchor access gateway is unchanged; A data channel is established between the target access gateway serving the target base station and the source anchor access gateway, and the data packet of the terminal is forwarded through the channel;

The W-CSN anchored handover is anchored by the home agent. When the terminal completes the W-ASN anchor handover, if the anchor access gateway needs to be changed, the source anchor access gateway or the target access gateway initiates W- After the handover is completed, the terminal accesses from the source anchor access gateway to the target access gateway, and the data channel between the source anchor access gateway and the target access gateway is deleted. The anchor home agent does not change; at this time, the identity of the target access gateway also becomes the target anchor access gateway.

In summary, the switching in the existing WiMAX system requires the support of a fixed anchor point, and the introduction of the fixed anchor point brings about the problem of packet path roundabout, which increases the transmission delay and bandwidth waste. Applying the identity and location separation technology to the WiMAX network can theoretically support the WiMAX legacy terminal to perform mobility without fixed anchors, solve the problem of packet path roundabout, and achieve the purpose of solving the dual identity of the IP address, but how to Based on the WiMAX system to achieve fixed anchor point switching, there is no related solution. Summary of the invention

The technical problem to be solved by the present invention is to provide a Wimax system capable of realizing unfixed anchor point switching and a switching method thereof.

In order to solve the above problem, the present invention provides a method for switching a fixed anchor point of a Wimax system, including: After the terminal completes the handover of the Wimax access service network anchor, the source access gateway (AGW) sends an AGW handover request to the target AGW;

After receiving the AGW handover request, the target AGW allocates a new location identifier (RID) to the terminal, and saves mapping information of the terminal identity (AID) and the new RID.

The target AGW initiates a RID registration process, updating the RID of the terminal saved by the terminal's home identity register (ILR);

The target AGW sends an AGW handover response to the source AGW to complete the handover, and the source AGW releases the resources allocated for the terminal, and the >3⁄4 text between the terminal and the communication peer is forwarded by the target AGW.

The connection service network of the Wimax system further includes an identity location core router (ILCR), each ILCR has a data interface with a generalized forwarding plane, and the generalized forwarding plane supports data packets with a RID as a source address and a destination address. Routing and forwarding;

After receiving the AGW handover request, the target AGW also selects the target ILCR, and establishes the tunnel when the tunnel of the terminal data forwarding has not been established with the target ILCR; after the handover is completed, the source ILCR releases the resource allocated for the terminal, The text between the terminal and the communication peer is forwarded by the target AGW and the target ILCR;

After the target AGW allocates a new RID to the AGW, the AGW also initiates an RID update process, and sends an RID update notification to the gateway accessed by all communication peers of the terminal, carrying the AID of the terminal and the new RID.

A data interface is provided between the AGW and the generalized forwarding plane in the Wimax access service network. The generalized forwarding plane supports routing and forwarding of data packets with the RID as the source address and the destination address. The target AGW allocates the pointing address to the terminal. After the new RID of the AGW, the RID update process is also initiated, and the RID update notification is sent to the gateway accessed by all the communication peers of the terminal, carrying the AID of the terminal and the new RID.

The AGW in the Wimax system maintains connection information between the terminal and the communication peer, and includes correspondence information between the terminal AID and all communication peer AIDs;

During the handover process, the source AGW brings the connection information of the terminal and the communication peer to the target AGW through the AGW handover request or the message that is actively sent to the target AGW. Alternatively, the source AGW receives the target AGW pair. After the terminal information is requested, the terminal and the communication are The connection information of the peer end is sent to the target AGW;

After the target AGW saves the connection information, the RID update process is initiated.

The AGW in the Wimax system maintains identity identification and location identification (AID-RID) mapping information of all communication peers of the accessed terminal;

In the switching process, before the target AGW initiates the RID update process, the source AGW sends the AID-RID mapping information of all the communication peers of the terminal to the target AGW to save; or the target AGW re-establishes the query by querying the ILR. AID-RID mapping information of all communication peers of the terminal.

When the target AGW initiates the RID update process, the IP address of the gateway accessed by the communication peer is determined according to the RID of all communication peers of the terminal, and the RID update notification is sent to the gateway accessed by the communication peer, and the terminal AID is carried. Mapping information with the new RID;

After receiving the RID update notification, the gateway accessed by the communication peer end updates the saved AID-RID mapping information of the terminal to the mapping information carried in the notification.

The tunnel between the target AGW and the target ILCR is a dynamic tunnel of the terminal established by the tunnel establishment process after the target AGW selects the target ILCR; or

The tunnel between the target AGW and the target ILCR is a static tunnel established after the two are powered on. The target ILCR learns that the terminal switches and obtains the AID of the terminal according to the notification of the target AGW or by checking the data packet.

In the process of the handover, the source ILCR receives the data packet sent by the communication peer to the terminal and forwards the data packet to the source AGW. The source AGW forwards the data packet to the target through a forwarding tunnel with the target AGW. The AGW, the target AGW sends the data packet to the terminal through the data channel of the terminal.

When the source ILCR is different from the target ILCR, a forwarding tunnel is established between the two ILCRs, and the forwarding tunnel is released after the handover is completed;

Before the forwarding tunnel between the two ILCRs is established, the source ILCR receives the data packet sent by the communication peer to the terminal and forwards the data packet to the source AGW. The source AGW forwards the packet to the target AGW, and the target AGW passes the The data channel between the terminals sends the data packet to the terminal;

After the forwarding tunnel between the two ILCRs is established, the source ILCR receives the communication peer and sends it to the end. The data packet of the terminal is forwarded to the target ILCR through the forwarding tunnel, and the target ILCR is forwarded or buffered and then forwarded to the target AGW, and the target AGW sends the data packet to the terminal through the data channel between the terminal and the terminal. .

The source AGW sends the identification information of the source ILCR to the target AGW. When the selected target ILCR is different from the source ILCR, the target AGW resends the identification information of the source ILCR to the target ILCR, and the target ILCR is established to the target ILCR. a forwarding tunnel of the source ILCR; or

After the target AGW selects the target ILCR, the identifier information of the target ILCR is sent to the source AGW. When the target ILCR is different from the source ILCR, the identifier information of the target ILCR is resent to the source ILCR. The ILCR establishes a forwarding tunnel to the target ILCR.

In the handover process, after receiving the downlink data packet sent by the communication peer end to the terminal through the generalized forwarding plane, the target ILCR forwards the data packet to the target through the tunnel between the target ILCR and the target AGW. The AGW, after the target AGW encapsulates the RID of the data packet, sends the data packet to the terminal through the data channel of the terminal.

After receiving the data packet sent by the communication peer to the terminal, the source AGW forwards the data packet to the target AGW through a forwarding tunnel with the target AGW, and the target AGW passes the data between the target and the terminal. The channel sends the data packet to the terminal;

After receiving the downlink data packet sent by the communication peer to the terminal through the generalized forwarding plane, the target AGW sends the data packet to the terminal through the data channel of the terminal.

In the handover process, before the source AGW sends the connection information between the terminal and the communication peer to the target AGW, the source AGW performs the RID encapsulation on the received downlink data packet of the terminal and maintains the connection information. After the source AGW sends the connection information between the terminal and the communication peer to the target AGW, the target AGW performs RID encapsulation on the downlink data packet of the terminal forwarded by the source AGW and maintains the connection information.

After the target AGW sends the RID update notification to the gateway accessed by the communication peer of the terminal, if the data packet sent by the communication peer to the terminal that is forwarded by the source ILCR is also received, the communication is sent to the communication again. The peer access gateway sends the RID update notification. The connection information between the AGW maintenance terminal and the communication peer end in the Wimax system includes the correspondence relationship between the terminal AID and all communication peer AIDs; after completing the handover of the Wimax access service network anchor, the terminal sends the connection The data packet path of the communication peers entering different ILCRs is as follows:

Before the target AGW maintains the connection information between the terminal and the communication peer, the data message sent by the terminal is forwarded to the source AGW, and the source AGW performs RID encapsulation and forwarding on the data packet. The source ILCR and/or the mapping forwarding plane are forwarded to the generalized forwarding plane, and then sent to the gateway accessed by the communication peer through the generalized forwarding plane;

After the target AGW maintains the connection information between the terminal and the communication peer, the data packet sent by the terminal is RID encapsulated and forwarded, and the data packet passes the target ILCR, or the source AGW and the source ILCR, or the target. The ILCR and the mapping forwarding plane, or the mapping forwarding plane, are forwarded to the generalized forwarding plane, and then sent to the gateway accessed by the communication peer through the generalized forwarding plane.

The connection information between the AGW maintenance terminal and the communication peer end in the Wimax system includes the correspondence relationship between the terminal AID and all communication peer AIDs; after completing the handover of the Wimax access service network anchor, the terminal sends the connection The data packet path of the communication peers entering different ILCRs is as follows:

Before the target AGW maintains the connection information between the terminal and the communication peer, the received data packet sent by the terminal is forwarded to the source AGW, and the source AGW performs RID encapsulation, query, and forwarding on the data packet. Go to the generalized forwarding plane and deliver the gateway to which the communication peer accesses;

After the target AGW maintains the connection information between the terminal and the communication peer, the data packet sent by the terminal is RID encapsulated and queried, and then directly forwarded to the generalized forwarding plane; or forwarded to the source AGW first, and then forwarded to the generalized AGW. The plane is delivered to the gateway of the communication peer.

In the handover process, the source AGW sends the connection information of the terminal and the communication peer to the target AGW;

After the target AGW saves the connection information sent by the source AGW, the connection information is maintained, or the target AGW starts to maintain the connection information after receiving the data packet sent by the terminal. And after receiving the connection information sent by the source AGW, combining the locally maintained connection information and the sent connection information. The manner in which the target AGW selects the target ILCR is one of the following manners: Mode 1: The target AGW interacts with the home AAA server of the terminal directly or by visiting the AAA server, and obtains information about the ILCR that the target AGW can connect to, and selects from the target An ILCR as the target ILCR;

Manner 2: When the terminal initially enters the network, the terminal belongs to the AAA server and allows the terminal to access the terminal.

The ILCR notifies the source AGW directly or by visiting the AAA server, and the source AGW notifies the target AGW of the ILCR that the terminal is allowed to access during the handover process, and the target AGW selects an ILCR as the target ILCR;

Method 3: Target The AGW selects the target ILCR according to its own configuration information.

The ILR is combined with the AAA server and is represented as AAA/ILR. The AAA/ILR stores the AID-RID mapping information of the home terminal. After the target AGW allocates a new RID to the terminal, the tunnel establishment process is initiated to the target ILCR. Bringing the AID of the terminal and the new RID to the target ILCR, and the target ILCR reuses the AID and the new RID of the terminal to the AAA/ILR of the terminal in the authentication process of the terminal AAA/ILR. The terminal home AAA/ILR updates the RID in the saved AID-RID mapping information of the terminal to the received new RID.

After the target AGW sends a RID update notification to the gateway accessed by all the communication peers of the terminal, or after the target AGW receives the response returned by the gateway accessed by all the communication peers, or the target AGW is initiating the RID. After the registration process, the AGW switch port is sent to the source AGW;

The resources allocated by the source AGW and the source ILCR for the terminal include at least a forwarding tunnel between the source AGW and the target AGW, a tunnel established between the source AGW and the source ILCR for the terminal, and the source AGW saves The connection information between the terminal and the communication peer.

The AGW handover request sent by the source AGW to the target AGW is an anchor data channel function (DPF) handover request;

The AGW handover response sent by the target AGW to the source AGW is an anchor DPF handover response, and then the target AGW initiates a context report procedure to the target base station, and sends the information of the AGW as the new anchor AGW information to the target base station. Correspondingly, the present invention also provides a Wimax system capable of implementing unfixed anchor point switching, including an access service network and a connection service network, where the access service network includes a base station and an access gateway (AGW), where:

The AGW is set to: when the terminal is handed in, allocate a new location identifier (RID) for the terminal and save mapping information of the terminal identity (AID) and the new RID, and register the RID of the terminal with the terminal home ILR. And sending a RID update notification to the gateway that the terminal accesses the peer access; after the terminal cuts out, releasing the resource allocated to the terminal; and forwarding the data packet of the cut-in or the cut-out terminal.

The AGW includes:

The control module is cut out and set to: After the W-ASN anchoring is completed, the AGW switching request is sent to the target AGW, and after receiving the AGW switching response, the resources allocated for the terminal are released; the cutting control module is set to: After receiving the AGW handover request, the device sends an allocation notification to the location identifier (RID) allocation module, carries the handover terminal AID, and then sends a registration notification to the RID registration module, sends an update notification to the RID update module, and returns an AGW handover response to the source AGW. The RID allocation module is configured to: allocate a new RID pointing to the AGW to the terminal after receiving the allocation notification, and save mapping information of the terminal AID and the new RID;

The RID registration module is configured to: initiate a RID registration process after receiving the registration notification, and update the RID of the terminal saved by the terminal's home identity register (ILR);

The RID update module is configured to: initiate an RID update process after receiving the update notification, and send an RID update notification to the gateway accessed by all the communication peers of the terminal, carrying the AID of the terminal and the new RID;

The packet forwarding module is configured to perform RID encapsulation, RID encapsulation, and forwarding on the data packet that is cut into the terminal, and forward the data packet to the target side after receiving the data packet to be sent to the cut-out terminal.

The connection service network includes an identity location core router (ILCR), and each of the ILCR and the generalized forwarding plane has a data interface; the generalized forwarding plane supports routing and forwarding of data packets with the RID as the source address and the destination address; The ILCR includes a packet forwarding module, and is configured to: route and forward data with a RID as a source address and a destination address;

The AGW further includes a tunnel establishment module; the cut-in control module of the AGW is further configured to: After receiving the AGW handover request, the target ILCR is selected, and the tunnel establishment module sends a tunnel establishment notification. The tunnel establishment module is configured to: after receiving the tunnel establishment notification, establish a dynamic tunnel with the target ILCR for the handover terminal; or

The AGW further includes a tunnel establishment module, and the tunnel establishment module is configured to: establish a static tunnel with the ILCR after power-on.

A data interface is provided between each AGW and the generalized forwarding plane. The generalized forwarding plane supports routing and forwarding of data packets with the RID as the source address and the destination address.

The AGW further includes a connection information maintenance module, configured to: maintain connection information between the terminal and the communication peer, and include correspondence information between the terminal AID and all communication peer AIDs;

The cut-out control module is further configured to: bring the connection information of the cut-out terminal and the communication peer to the target AGW by using the AGW switch request or the message that is actively sent to the target AGW; or the hand-in control module is further configured to: Sending a request for the cut-in terminal information to the source AGW, the cut-out control module is configured to: after receiving the request, send the connection information of the terminal and the communication peer to the target AGW;

The hand-in control module is further configured to: save the received connection information and then send the update notification.

The AGW further includes a mapping information maintenance module, configured to: maintain identity identification and location identification (AID-RID) mapping information of all communication peers of the accessed terminal;

The cut-out control module is further configured to: send AID-RID mapping information of all communication peers of the cut-out terminal to the target AGW; the hand-in control module is configured to: after receiving the AID-RID mapping information sent by the source AGW, Re-initiating the RID update process; or, the hand-in control module is further configured to: query the identity location register (ILR), and reconstruct AID-RID mapping information of all communication peers that are cut into the terminal;

The RID update module is configured to: when initiating the RID update process, determine an IP address of the gateway accessed by the communication peer according to the RID of all communication peers of the terminal, and send an RID update to the gateway accessed by the communication peer The notification carries the mapping information of the terminal AID and the new RID.

The packet forwarding module in the AGW is further configured to: after receiving the downlink data packet sent to the cut-out terminal, forward the packet to the target AGW through the forwarding tunnel with the target AGW, and receive the sending and sending When the downlink data packet of the terminal is received, the data packet is sent to the terminal through the data channel of the terminal.

The ILCR further includes a tunnel establishment module, configured to: establish a forwarding tunnel with the source ILCR for the cut-in terminal, or establish a forwarding tunnel with the target ILCR for the cut-out terminal, and release the forwarding tunnel after the handover is completed;

The packet forwarding module in the ILCR is further configured to: forward the data packet sent to the cut-out terminal to the source AGW first, and then pass the forwarding tunnel between the source and the target ILCR after the handover process is established. The forwarding tunnel is forwarded to the target ILCR; and the received data packet sent to the hand-in terminal is forwarded to the target AGW through a tunnel with the target AGW.

The cut-out control module is further configured to: send the identifier information of the source ILCR to the target AGW; the hand-in control module is further configured to: when the selected target ILCR is different from the source ILCR, send the identifier information of the source ILCR to a target ILCR; the tunnel establishment module in the ILCR is configured to: establish a forwarding tunnel to the source ILCR according to the received identity information of the source ILCR; or

The hand-in control module is further configured to: send the identification information of the target ILCR to the source AGW; the cut-out control module is further configured to: when the received target ILCR is different from the source ILCR, send the identifier information of the target ILCR To the source ILCR; the tunnel establishment module in the ILCR is configured to: establish a forwarding tunnel to the target ILCR according to the identifier information of the received target ILCR.

The cut-out control module is configured to: send the first notification to the packet forwarding module in the AGW when the connection information of the cut-out terminal and the communication peer is sent to the target AGW;

The hand-in control module is configured to: after receiving the connection information between the hand-in terminal and the communication peer end sent by the source AGW, save the connection information, and send a second notification to the message forwarding module in the AGW;

The packet forwarding module in the AGW is configured to: before receiving the first notification, perform RID encapsulation on the received downlink data packet of the cut-out terminal, and then forward the packet to the target AGW, and receive the foregoing After receiving the second notification, the downlink data packet forwarded to the source AGW is directly sent to the terminal, and after the second notification is received, the RID is solved. After being encapsulated, the data packet is sent to the terminal. The downlink data packet that is forwarded to the target ILCR is de-encapsulated by the RID, and then sent to the terminal through the data channel of the terminal.

The connection service network includes an ILCR; the packet forwarding module in the AGW is set to: Forwarding the received uplink data packet of the cut-out terminal to the source ILCR, and performing RID encapsulation on the uplink data packet before receiving the first notification; and receiving the uplink data packet sent by the intercepted terminal, If the tunnel with the target ILCR is not established, the uplink data packet is forwarded to the source AGW, and after receiving the second notification, the uplink data packet is RID encapsulated, for example, a tunnel with the target ILCR is established. The RID encapsulation of the uplink data packet is forwarded to the target ILCR.

The AGW has a data interface to the generalized forwarding plane. The packet forwarding module in the AGW is configured to: perform the RID encapsulation of the received uplink data packet of the cut-out terminal and forward it to the generalized forwarding plane; Before the second notification, the received uplink data packet sent by the terminal is directly forwarded to the source AGW. After receiving the second notification, the uplink data packet is RID encapsulated and then forwarded to the generalized forwarding plane.

The hand-in control module is configured to: select a target ILCR in one of the following manners: mode 1. The hand-in control module interacts with an AAA server that is connected to the terminal, and obtains information about the ILCR that the target AGW can connect to. Select an ILCR as the target ILCR;

Manner 2: The hand-in control module selects an ILCR as the target ILCR from the ILCR that the hand-in terminal is allowed to access from the source AGW, and the ILCR that is allowed to access is sent to the source AGW by the AAA server to which the hand-in terminal belongs.

Manner 3: The hand-in control module selects a target ILCR according to the configuration information of the AGW. The cut-out control module is configured to: the AGW handover request sent to the target AGW is an anchor data channel function (DPF) handover request; the handover control module is configured to: the AGW handover response sent to the source AGW is an anchor DPF handover Respond

The hand-in control module is configured to: after sending a RID update notification to a gateway accessed by all communication peers of the terminal, or after receiving a response returned by the gateway accessed by all communication peers, sending an anchor to the source AGW After the DPF handover response is determined, a context reporting procedure is also initiated to the target base station, and the information of the AGW is sent to the target base station as the new anchor AGW information.

The above method and system apply the mobile communication network with the separation identifier and the location identifier to the WiMAX network, which can overcome the problem that the handover in the existing WiMAX system requires the support of a fixed anchor point, and reduces the path of the data packet. Roundabout, reducing transmission delay and bandwidth waste, And it can also achieve the purpose of solving the dual identity of the IP address.

BRIEF abstract

The accompanying drawings are intended to provide a

Figure Network diagram of the identity separation architecture.

Figure 2 is a schematic diagram of an existing WiMAX network architecture.

3 is a schematic diagram of a WiMAX network architecture based on an embodiment of the present invention.

4 is a schematic diagram of another WiMAX network architecture on which an embodiment of the present invention is based.

FIG. 5 is a flow chart of the unfixed anchor point switching according to the first embodiment of the present invention.

6 is a flow chart of the unfixed anchor point switching according to the second embodiment of the present invention.

7 is a flow chart of a fixed anchor point switching according to a third embodiment of the present invention.

FIG. 8 is a flow chart of the unfixed anchor point switching according to Embodiment 4 of the present invention.

FIG. 9 is a flowchart of the anchorless anchor point switching according to Embodiment 5 of the present invention.

FIG. 10 is a flow chart of the unfixed anchor point switching according to Embodiment 6 of the present invention.

Figure 11 is a flow chart showing the unfixed anchor point switching in the seventh embodiment of the present invention.

Figure 12 is a flow chart showing the unfixed anchor point switching in the twelfth embodiment of the present invention.

Preferred embodiment of the invention

The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings and specific embodiments to enable those skilled in the art to understand the invention. .

The present invention applies the above SILSN architecture to a WiMAX system to achieve unfixed anchor point switching. According to the SILSN architecture and its working principle described in the background, it can be understood that when the terminal moves across the ASN, the target ASN on the side of the handover needs to assign a RID to the terminal, and initiate registration with the home ILR of the terminal; The AID-RID mapping information of the terminal is deleted, and the AID-RID mapping information of all communication peers of the terminal is maintained. In order to send the communication peer to the terminal The packet can be quickly routed to the target ASN, and the RID update notification needs to be sent to the gateway accessed by the communication peer. The source ASN may also transmit connection information of the terminal and the communication peer and/or AID-RID mapping information of all communication peers to the target ASN. During the handover process, the source ASN needs to forward the packet sent by the communication peer to the terminal to the target ASN.

The following is a description of the improvements that have been made to the original system to achieve unfixed anchor switching, including related functions and processes.

In the text, when a network element is used as the original network element to process the terminal handover, the terminal is called a cut-out terminal. When a network element is used as the target side network element to process the terminal handover, the terminal is called the cut-in terminal. . The network element that accesses the communication peer end of the terminal is simply referred to as the peer network element. For the convenience of description, when the function of a certain network element is expressed, the user terminal accessing the network element is called a terminal, and the access is performed. The user terminal that communicates with the user terminal of the network element is called a communication peer. In addition, since the present invention implements no fixed anchor point switching, the source anchor access gateways in the original handover procedure are collectively referred to as source access gateways. The anchor access gateways are collectively referred to as target access gateways.

System one

Fig. 3 is a schematic diagram showing the network architecture of a Wimax system to which the above-described identity location separation technique is applied. The solid line indicates the connection of the bearing surface, and the broken line indicates the connection of the control plane. The Wimax network architecture includes an Access Service Network (W-ASN) and a Connected Service Network (W-CSN). The connected service network has a data plane interface to the generalized forwarding plane, which is represented as a D interface. The generalized forwarding plane may be a packet data network that supports routing and forwarding of data messages by RID, and other embodiments are the same.

In the W-CSN, an original network element such as an authentication and authorization accounting (AAA) proxy or a server (AAA Proxy/Server) is also provided, and an Identity Location Core Route (ILCR) and an identity location register are also set. ILR) and packet forwarding function (PTF), ILR and PTF can be combined, denoted as ILR/PTF, and ILR/PTF in each W-CSN constitutes a mapping forwarding plane. Among them, ILCR combines the functions of HA and / or W-CR (Wimax core router), and has the new functions needed to achieve identity identification and location separation.

The W-ASN includes a base station and an access gateway, wherein the access gateway is based on a functional entity (such as an anchor DPF, an authenticator, etc.) of the access gateway in the Wimax architecture. Expanded the new features required to implement identity and location separation. In the system, the access gateway (AGW) is located in the WiMAX access service network (W-ASN), which is used to allocate the RID to the terminal, register and deregister the RID of the terminal to the ILR, and query the ILR for the RID of the communication peer, and maintain the terminal and the The connection information of the communication peer initiates RID update to the peer end, maintains the AID-RID mapping information of the terminal and its communication peer end, performs RID encapsulation and decapsulation on the data packet, and implements routing and forwarding of data packets according to the RID. The Identity Location Core Router (ILCR) is located in the W-CSN and is used to route and forward data packets with the RID as the source and destination addresses. This function is similar to the routers in the prior art.

Related to switching, (not specifically indicated below, corresponding to Embodiments 1 to 3):

The AGW is configured to allocate a new location identifier (RID) to the terminal when the terminal is handed in, save the mapping information of the terminal identity (AID) and the new RID, and register the RID of the terminal with the terminal belonging to the ILR. The gateway that the terminal communicates with the peer end sends a RID update notification. After the terminal is cut out, the resource allocated to the terminal is released; and the data packet of the cut-in or the cut-out terminal is forwarded.

Specifically, the AGW includes:

The cut-out control module is configured to send an AGW handover request to the target AGW after the W-ASN anchor handover is completed, and release the resource allocated for the terminal after receiving the AGW handover response;

The cut-in control module is configured to: after receiving the AGW switching request, select the target ILCR, send an allocation notification to the location identifier (RID) allocation module, carry the hand-in terminal AID, and then send a registration notification to the RID registration module, and send the registration notification to the RID update module. Update notification, send a tunnel establishment notification to the tunnel establishment module, and return an AGW handover response to the source AGW;

a RID allocation module, configured to allocate a new RID directed to the AGW to the terminal after receiving the allocation notification, and save mapping information of the terminal AID and the new RID;

The RID registration module is configured to initiate a RID registration process after receiving the registration notification, and update the RID of the terminal saved by the terminal's home identity register (ILR);

The RID update module is configured to initiate an RID update process after receiving the update notification, and send an RID update notification to the gateway accessed by all the communication peers of the terminal, carrying the AID of the terminal and the new RID;

The packet forwarding module is configured to perform RID encapsulation, RID encapsulation, and forwarding on the data packet that is cut into the terminal, and forward the data packet to the target end after receiving the data packet to be sent to the cut-out terminal. The different stages of the handover process the data packets that are cut in and out of the terminal. The tunnel establishment module is configured to establish a target for the cut-in terminal after receiving the tunnel establishment notification

Tunnel between ILCR.

The ILCR includes a packet forwarding module, configured to route and forward data packets with the RID as the source address and the destination address;

The AGW further includes a connection information maintenance module, configured to maintain connection information between the terminal and the communication peer end, where the information about the correspondence between the terminal AID and all communication peer AIDs is included;

The cut-out control module is further configured to bring the connection information of the cut-out terminal and the communication peer to the target AGW through the AGW handover request or the message that is actively sent to the target AGW. Alternatively, the cut-in control module is further configured to send a pair cut to the source AGW. After the terminal information request is received, the cut-out control module sends the connection information of the terminal and the communication peer to the target AGW after receiving the request;

The cut-in control module saves the received connection information before sending an update notification.

The AGW further includes a mapping information maintenance module, configured to maintain identity identification and location identification (AID-RID) mapping information of all communication peers of the accessed terminal;

The cut-out control module is further configured to send the AID-RID mapping information of all the communication peers of the cut-out terminal to the target AGW; the switch-in control module receives the AID-RID mapping information sent by the source AGW, and then initiates the RID update process; or The cut-in control module is further configured to query an identity location register (ILR) to reconstruct AID-RID mapping information of all communication peers that are cut into the terminal;

When the RID update process initiates the RID update process, the RID of the communication peer is determined according to the RID of all communication peers of the terminal, and the RID update notification is sent to the gateway accessed by the communication peer, carrying the terminal AID and the new Mapping information of the RID.

(corresponding to the first embodiment)

After receiving the downlink data packet sent to the cut-out terminal, the packet forwarding module in the AGW forwards the data packet to the target AGW through the forwarding tunnel with the target AGW, and receives the downlink data packet sent to the hand-in terminal. A data channel with the terminal is sent to the terminal. Corresponds to the flow of Figure 5.

(corresponding to the second and third embodiments)

The ILCR further includes a tunnel establishment module, configured to establish a forwarding tunnel with the source ILCR for the cut-in terminal, or establish a forwarding tunnel with the target ILCR for the cut-out terminal, and release the forwarding tunnel after the handover is completed; The packet forwarding module in the ILCR forwards the received data packet sent to the cut-out terminal to the source AGW first. After the forwarding tunnel between the source and destination ILCRs is established, the packet forwarding module forwards the packet to the source AGW. The target ILCR is forwarded to the target AGW by the tunnel to the target AGW.

(corresponding to the second and third embodiments)

The cut-out control module is further configured to send the identifier information of the source ILCR to the target AGW; the cut-in control module is further configured to: when the selected target ILCR is different from the source ILCR, send the identifier information of the source ILCR to the target ILCR; The tunnel establishment module is configured to establish a forwarding tunnel to the source ILCR according to the received identifier information of the source ILCR; or

The cut-in control module is further configured to send the identification information of the target ILCR to the source AGW; the cut-out control module is further configured to send the identifier information of the target ILCR to the source ILCR when the received target ILCR is different from the source ILCR; The tunnel establishment module is configured to establish a forwarding tunnel to the target ILCR according to the identifier information of the received target ILCR.

When the cut-out control module sends the connection information of the cut-out terminal and the communication peer to the target AGW, the first notification is sent to the packet forwarding module in the AGW;

The switch-in control module saves the connection information after receiving the connection information between the hand-in terminal and the communication peer end sent by the source AGW, and sends a second notification to the message forwarding module in the AGW;

Before receiving the first notification, the packet forwarding module in the AGW performs RID encapsulation on the received downlink data packet of the cut-out terminal, and then forwards the packet to the target AGW. After receiving the first notification, the packet forwarding module directly forwards the packet to the target AGW. Before receiving the second notification, the downlink data packet that is forwarded to the source AGW is directly sent to the terminal, and after receiving the second notification, after performing the RID encapsulation, sending and then sending the data channel through the terminal. Give the terminal.

The connection service network includes the ILCR; the 4艮 file forwarding module in the AGW forwards the received uplink data packet of the cut-out terminal to the source ILCR, and performs RID encapsulation on the uplink data packet before receiving the first notification; The uplink data packet sent by the incoming terminal is not established, and the uplink data packet is forwarded to the source AGW. After receiving the second notification, the uplink data packet is further subjected to a RID. Encapsulation, such as a tunnel with the target ILCR has been established, the number of uplinks According to the message, the RID is encapsulated and forwarded to the target ILCR.

Embodiment 1

FIG. 5 is a first flow chart of the network architecture of the WiMAX system using the identity identification and location separation technology shown in FIG. 3, which implements the terminal without fixed anchor point switching, and uses the forwarding tunnel between the AGWs to perform data forwarding in the handover process. The scenario, the process includes:

Step 501: After the terminal moves, the handover occurs. After the W-ASN anchor handover is completed, the terminal switches from the source base station access to the target base station access, and a data channel is established between the source AGW and the target AGW.

The terminal can complete the W-ASN anchor switching according to existing standards. After the source AGW establishes a data channel with the target AGW, the downlink and uplink data packet paths between the terminal and the communication peer are D51 and D52:

Unless otherwise specified, the terminal mentioned in the process refers to the terminal in which the handover occurs, and other embodiments are the same.

D51, the downlink data packet path: after receiving the data packet sent by the communication peer to the terminal, the source ILCR forwards the data packet to the source AGW, and the source AGW performs RID encapsulation on the data packet (ie, strips the RID therein), and restores After the format of the data packet sent by the communication peer, the data packet is forwarded to the target AGW through the data channel between the source AGW and the target AGW, and the target AGW passes the packet through the data channel between the source and the terminal. Send to the terminal.

D52, the uplink data packet path: the terminal sends the uplink data packet to the target base station, and the target base station forwards the data packet to the target AGW, and the target AGW forwards the data packet to the source AGW through the data channel between the source AGW and the target AGW. The source AGW performs RID encapsulation and forwarding on the data packet, and is forwarded to the generalized forwarding plane by the source ILCR and/or the mapping forwarding plane, and then sent to the gateway accessed by the peer end through the generalized forwarding plane, such as AGW, ILCR, or It is another gateway such as a border gateway.

In this document, the RID encapsulation and forwarding of a data packet by a network element is similar to the RID encapsulation and forwarding of the data packet by the ASN in the background. Specifically, the network element caches the AID from the local cache according to the AID of the communication peer. The RID mapping information is used to find the RID of the communication peer. If the RID is found, the RID of the terminal and the communication peer are respectively encapsulated in the data packet as the source and destination addresses, and are directly forwarded to the data packet. The generalized forwarding plane (when the network element is ILCR, or when there is no ILCR) or forwarded to the source ILCR and then forwarded by the source ILCR to the generalized forwarding plane (when the network element is AGW); if not found, the network element will The RID of the terminal is encapsulated in the data packet as the source address, forwarded to the mapping forwarding plane or forwarded to the mapping forwarding plane by the source ILCR, and the RID of the communication peer is queried to the ILR and cached. When the RID of the communication peer is not found, another RID encapsulation and forwarding mode can be used: firstly query the RID of the communication peer from the ILR and cache it, and then use the RID of the terminal and the communication peer as the source and destination respectively. The address is encapsulated in a data packet, forwarded directly to the generalized forwarding plane or forwarded to the source ILCR, and then forwarded by the source ILCR to the generalized forwarding plane.

The uplink and downlink data message paths described in the embodiments are all for the case where the terminal and the communication peer access different AGWs (when there is no ILCR) or ILCR, if the terminal and the communication peer access the same AGW ( When there is no AGW) or ILCR, the AGW or ILCR may not perform RID encapsulation and/or query RID, and directly forward it to the communication peer by the AGW or ILCR, and does not need to strip the RID when forwarding. Of course, the AGW or the ILCR may also determine whether to access the same AGW or ILCR, and encapsulate, route, and forward the same manner when accessing different AGWs or ILCRs. Other embodiments are the same.

In addition, when the two network elements forward data through the tunnel, the tunnel encapsulation and decapsulation processing are included, and the text is no longer described.

During the data packet sending process, the source AGW maintains the connection information between the terminal and the communication peer. For example, the connection information may be updated according to the flow real-time detection mechanism (such as deleting the AID of the communication peer determined to be offline, and adding a new communication peer. AID, etc.), can also add the AID and RID of the new communication peer in the data to the connection information by checking the data message.

Step 502: The target AGW prepares to initiate an anchor AGW relocation, and sends an anchor DPF handover trigger message to the source AGW. This step is optional.

Step 503: The source AGW sends an anchor DPF handover request to the target AGW, where the message carries the connection information between the terminal and the communication peer, and may also carry the AID-RID mapping information of all communication peers of the terminal;

The source AGW may send an anchor DPF handover request after receiving the target AGW anchor DPF handover trigger message and agreeing to anchor the DPF handover. It is also possible that the source AGW decides to send an anchor DPF handover request when initiating an anchor AGW relocation. In this step, only the AID-RID mapping information of all communication peers of the terminal may be transmitted. At this time, the connection information between the terminal and the communication peer has also been transmitted, because it is already included in the AID-RID mapping information, and other embodiments. The same. The above-mentioned connection information and mapping information carried in the anchor DPF switching request may also be carried in other messages such as newly created messages.

After the step, the connection information is sent to the target AGW, and the target AGW is used to maintain the connection information between the terminal and the communication peer. Therefore, the target AGW needs to perform RID encapsulation and decapsulation on the data packet, and at the same time check the data packet to ensure the connection information. Integrity. The downlink and uplink data packet paths of the terminal are still as shown in D51 and D52. However, when the target AGW cannot query the RID of the communication peer, the uplink data packet can be forwarded to the generalized forwarding plane through the mapping forwarding plane.

However, the maintenance of the connection information by the target side network element (such as the target ILCR and the target AGW) of each embodiment may also be performed before receiving the connection information sent by the source side, such as after receiving the data message sent by the hand-in terminal. Start saving and maintaining the connection information between the terminal and the communication peer. After receiving the connection information sent from the source side, the local maintenance connection information and the sent connection information are combined to ensure the integrity of the connection information. The maintenance of the AID-RID mapping information of the communication peer may be started simultaneously with the maintenance of the connection information, or may be performed separately. Especially when the source side does not transmit the mapping information to the target side, the target side network element responsible for maintaining the mapping information is After receiving the uplink and downlink data packets related to the terminal, the AID-RID mapping information of the communication peer end of the terminal can be started.

Step 504: The target AGW saves the connection information between the terminal and the communication peer, allocates a new RID to the terminal, and locally caches the mapping information of the AID and the new RID of the terminal.

If the anchor DPF handover request carries the AID-RID mapping information of all the communication peers of the terminal, the target AGW directly saves the AID-RID mapping information; if not, the target AGW can query the ILR in the subsequent data packet forwarding process. And checking the RID of the communication peer in the data packet, and reconstructing the AID-RID mapping information of all communication peers of the terminal.

Step 505: The target AGW selects the target ILCR, and initiates a tunnel establishment process to the target ILCR to establish a tunnel with the target ILCR.

In this embodiment and other embodiments, when the target AGW selects the target ILCR, the following manners can be adopted: Manner 1: The target AGW interacts with the AAA server to which the terminal belongs, obtains the ILCR information that the target AGW can connect, and selects an ILCR as the target ILCR, such as according to a local policy (such as the location of the terminal and/or network configuration) or The terminal indicates to select, and can refer to the way that the AGW selects the HA. In the case of roaming, the interaction needs to be forwarded by visiting the AAA server. The visited AAA server can notify the target AGW of the ILCR information of the target AGW connection in the forwarding process.

In the second mode, when the terminal is initially connected to the network, the AAA server and the visited AAA server that the terminal belongs to have notified the source AGW of the ILCR that the terminal is allowed to access. When the handover is performed, the source AGW notifies the target to the target in step 503. AGW, the target AGW selects an ILCR as the target ILCR, and of course there may be only one.

Method 3: The target AGW selects the target ILCR according to its own configuration information (such as the ILCR that the AGW can connect to, the network topology).

During the tunnel establishment process between the target AGW and the target ILCR, the target AGW sends the AID of the terminal to the target ILCR. The dynamic tunnels in the text are all established for the switched terminal, and other embodiments are the same. The target ILCR may also need to interact with the home AAA server to complete the authentication.

In this paper, between AGW and ILCR, there are many ways to tunnel between ILCR and ILCR, such as L2TPv3, IP-in-IP, MPLS (LDP-based and RSVP-TE based), GRE, MIP and IPsec. The invention is not limited to any particular manner.

After this step, the downlink and uplink data packet paths of the terminal are D53 and D54:

D53, the downlink data packet path: the source ILCR receives the data packet sent by the communication peer to the terminal and forwards the data packet to the source AGW. The source AGW forwards the data packet to the target AGW through the data channel between the source AGW and the target AGW. The target AGW performs RID encapsulation on the data packet, restores the format of the data packet sent by the communication peer, and sends the data packet to the terminal through the data channel of the terminal.

D54, the uplink data packet path: The terminal sends the uplink data packet to the target base station, and the target base station forwards the data packet to the target AGW, and the target AGW performs RID encapsulation and forwarding on the data packet, and passes the target ILCR and/or the mapping forwarding plane. Forwarded to the generalized forwarding plane, and then sent to the gateway of the peer access through the generalized forwarding plane. During the data packet transmission process, the target AGW maintains the connection information between the terminal and the communication peer.

Step 506: After the target AGW allocates a new RID to the terminal, initiates a RID registration process to the terminal home ILR, and sends the mapping information of the AID and the new RID of the terminal to the ILR through the RID registration request.

Step 507: The terminal belongs to the ILR to verify the validity of the AID in the RID registration request. After the verification is passed, the saved AID-RID mapping information of the terminal is updated to the AID-RID mapping information in the request. In another embodiment, the AAA The server may be associated with ILR, expressed as AAA/ILR. At this time, the target AGW may combine the registration process of step 506 and step 507 with the tunnel establishment process initiated by the target ILCR in step 505 after the new RID is allocated to the terminal, and bring the terminal AID and the new RID to the target ILCR. The target ILCR reuses the authentication procedure of the terminal home AAA/ILR to bring the new RID of the terminal AID to the terminal home AAA/ILR, and the terminal home AAA/ILR updates the saved RID of the terminal to the received new one. RID. Other embodiments can also make this change.

Step 508: After the target AGW allocates a new RID to the terminal, the RID update process is initiated to the opposite end, and the RID update notification is sent to the gateways accessed by all the peers according to the RID of the communication peer, and the AID and the new RID of the terminal are carried;

After receiving the connection information between the terminal and the communication peer, the target AGW queries the RID of the communication peer according to the AID of the communication peer, or the target AGW directly obtains the RID of the communication peer according to the information transmitted by the source AGW, and then can initiate the RID to the peer end. Update process. If the information is not delivered, the target AGW needs to re-establish the connection information with the communication peer and obtain the AID-RID mapping information of the communication peer, and then initiate the RID update process to the peer end, and may also obtain the AID-RID mapping information of the communication peer. You need to go back to the mapping forwarding plane to query the RID of the communication peer.

The RID of the communication peer includes the address information of the gateway accessed by the communication peer, and can be used to determine the IP address of the gateway accessed by the communication peer. The RID may be an IP address of a gateway accessed by the communication peer. When the RID is not the IP address of the gateway accessed by the communication peer, the target AGW may query the configuration information or perform a DNS query according to the RID, and obtain the IP address of the gateway accessed by the communication peer corresponding to the RID. The gateway accessed by the communication peer can be an AGW or other gateway or border gateway. After receiving the RID update notification, the gateway accessing the communication end will update the saved AID-RID mapping information of the terminal to the AID-RID mapping information in the notification, and then the gateway accessed by the opposite end will be given to the terminal. The data is sent to the target ILCR, and the AGW accessed by the peer can return the RID update response to the AGW accessed by the terminal.

The RAG registration process initiated by the target AGW to the target ILCR in the step 505, the RID registration process initiated in the steps 506 and 507, the RID update process initiated to the peer end in step 508 has no necessary sequence, and may be executed in parallel. . Before the tunnel between the target AGW and the target ILCR is established, if the target ILCR receives the data packet of the communication peer, the target ILCR needs to be buffered, and then forwarded to the target AGW after the tunnel is established.

After this step, the downlink and uplink data packet paths of the terminal are D55 and D56:

D55, the downlink data packet path: the target ILCR receives the data packet sent by the communication peer end to the terminal through the generalized forwarding plane, and then forwards the data packet to the target AGW. The target AGW encapsulates the data packet and re-encapsulates the data packet, and restores the data packet to the communication peer. After the format of the data message, the message is sent to the terminal through the data channel of the terminal.

D56, the path of the upstream data packet, the same as D54, and will not be described here.

During the data packet transmission process, the target AGW maintains the connection information between the terminal and the communication peer.

At this time, there may be a data packet forwarded by the source ILCR. In this case, the downlink data packet path is the same as D54. This may be caused by the AID-RID mapping information of the terminal that the communication peer access does not update the terminal in time, or because the gateway accessed by the communication peer does not receive the update terminal AID-RID mapping information, and the target AGW can be A RID update notification is sent to the gateways accessed by these communication peers.

Step 509: The target AGW sends an anchor DPF handover response to the source AGW, and completes the handover of the anchor AGW.

This step can be performed after step 506. In still another embodiment, the target AGW may also send an anchor DPF handover response to the source AGW after receiving the RID update response returned by the gateway accessed by all the communication peers. Step 510: The source AGW or the target AGW releases the data channel between the two, and the source AGW also releases the saved connection information between the terminal and the communication peer, the user context of the terminal, and the like; If the communication peer does not communicate with other terminals of the access source AGW, the source AGW also deletes the AID-RID mapping information of the communication peer, otherwise, the AID-RID mapping information of the communication peer is retained.

This step can be started directly after step 509. However, in order to better ensure the continuity of data, the execution of this step can also be triggered by a timer, which is started after step 509, and the resource is triggered after the timer expires. Release.

Step 511: Release a tunnel between the source AGW and the source ILCR.

Step 512: The target AGW initiates a context reporting process to the target base station, and the new anchor AGW is

The (ie target AGW) information is sent to the target base station. This step can be performed after step 509.

In the above process, the connection information between the terminal and the communication peer may not be transmitted in step 503, but the connection information between the terminal and the communication peer is obtained by the target AGW from the source AGW before the target AGW initiates the RID update process.

In this embodiment, after the tunnel between the target AGW and the target ILCR is established, the uplink data packet is forwarded from the tunnel, such as D54 and D56. Optionally, the uplink data packet can also be forwarded from the tunnel between the target AGW and the source AGW, that is, the data packet is forwarded from the target AGW to the source AGW, and then to the source ILCR, between the target AGW and the source AGW. After the tunnel is released, press the path in D54 to send.

Embodiment 2

In this embodiment, based on the network architecture of the WiMAX system of the application identity identification and location separation technology of the system 1, in the process of implementing the anchorless handover, the forwarding tunnel between the ILCRs is used for data forwarding, and the ILCR is initiated by the target ILCR. The scenario of the forwarding tunnel establishment is as follows:

Step 601, the same step 501. Thereafter, the downlink and uplink data of the terminal are D61 and D62, and D61 is the same as D51 and D62.

During the data packet transmission process, the source AGW maintains the connection information between the terminal and the communication peer. Protection.

Step 602, the same step 502;

Step 603: The source AGW sends an anchor DPF handover request to the target AGW, where the identifier information of the source ILCR and the connection information between the terminal and the communication peer end are carried.

The identifier information of the source ILCR may be the address of the source ILCR or the dedicated identifier of the source ILCR. The anchor DPF handover request may further carry the AID-RID mapping information of all communication peers of the terminal.

After that, the downlink and uplink data packet paths of the terminal are the same as those shown in D61 and D62. Only the target AGW performs RID encapsulation and decapsulation on the data packets. During the data packet sending process, the target AGW maintains the connection information between the terminal and the communication peer.

Step 604, the same step 504;

Step 605, the target AGW selects the target ILCR, initiates a tunnel establishment process to the target ILCR, establishes a tunnel with the target ILCR, and if the source ILCR is different from the target ILCR, notifies the target ILCR identification information to the target ILCR;

If the source ILCR is the same as the target ILCR, then step 606 is cancelled.

Step 606: The target ILCR initiates a forwarding tunnel establishment process to the source ILCR according to the identifier information of the source ILCR, and establishes a forwarding tunnel with the source ILCR.

Thereafter, the downlink and uplink data of the terminal are the D63 and D64:

D63, the downlink data packet path: After receiving the data packet sent by the communication peer to the terminal, the source ILCR forwards the packet to the target ILCR through the forwarding tunnel, and the target ILCR forwards the packet to the target AGW. After the target AGW decapsulates the RID of the data packet, Sending the message to the terminal through the terminal data channel.

D64, same as D54.

The foregoing step 606 and the step 605 can be performed in parallel, that is, the target ILCR establishes a tunnel between the ILCRs in the tunnel process between the establishment and the target AGW, and the step 606 may be completed before the step 605, and the downlink data packet needs to be in the target. The ILCR is cached first, and the target ILCR is set up with the target AGW and then sent to the target AGW. The uplink data packet path at this time is basically the same as D62, but only the target AGW performs RID encapsulation and decapsulation on the data file. During the data packet transmission process, the target AGW maintains the connection information between the terminal and the communication peer.

Step 607 to step 609, the same steps 506 to 508;

After that, the downlink and uplink data of the terminal are D65 and D66, and D65 is the same as D55 and D66. During the data packet transmission process, the target AGW maintains the connection information between the terminal and the communication peer.

At this time, there may be a data packet forwarded by the source ILCR, and the corresponding downlink data packet path is the same as D63. The target AGW can notify the peer again to update the AID-RID mapping information.

Step 610 to step 612, the same steps 509 to 511;

Step 613: The source ILCR or the target ILCR initiates release of the data forwarding tunnel between the two; Step 614, the same step 512.

In the above process, the connection information between the terminal and the communication peer may not be transmitted in step 603, and the connection information is obtained by the target AGW from the source AGW before the target AGW initiates the RID update process. Correspondingly, the source AGW performs RID encapsulation and maintenance of the data message sent to the terminal before transmitting the connection information, and after the delivery, the target AGW performs RID encapsulation and maintains the connection information.

In this embodiment, after the tunnel between the target AGW and the target ILCR is established, the uplink data packet is forwarded from the tunnel, such as D64 and D66. Optionally, the uplink data packet may also be forwarded from the tunnel between the target AGW and the source AGW, that is, the data packet is forwarded from the target AGW to the source AGW, to the source ILCR, or from the target ILCR to the source ILCR. Forwarding tunnel forwarding, after the tunnel between the target AGW and the source AGW or the forwarding tunnel between the target ILCR and the source ILCR is released, and then sent according to the path in D64.

Embodiment 3

In this embodiment, based on the network architecture of the WiMAX system of the application identity identification and location separation technology of the system 1, the forwarding tunnel between the ILCRs is used for data forwarding in the process of implementing no fixed anchor point handover, and the ILCR is initiated by the source ILCR. The scenario in which the forwarding tunnel is established includes the following steps: Step 701, the same step 601; After that, the downlink and uplink data of the terminal are D71 and D72. Among them, D71 is the same as D61 and D72. During the data packet transmission process, the source AGW maintains the connection information between the terminal and the communication peer. Step 702: When the target AGW is ready to initiate the anchor AGW relocation, select the target ILCR, send the anchor DPF handover trigger message to the source AGW, and carry the identifier information of the target ILCR in the message;

Step 703: If the source AGW agrees to perform the anchor DPF handover and the target ILCR is different from the source ILCR, send an ILCR handover request to the source ILCR, and carry the identifier information of the target ILCR. In this step, if the source AGW agrees to perform the anchor DPF handover. And the target ILCR is the source ILCR, and step 706 can be directly performed, and steps 704 and 705 are cancelled accordingly.

Step 704: The source ILCR initiates a forwarding tunnel establishment process to the target ILCR according to the identifier information of the target ILCR, and establishes a forwarding tunnel with the target ILCR.

Step 705: The source ILCR sends an ILCR handover response to the source AGW.

After that, the downlink and uplink data of the terminal are the D73 and D74:

D73, the downlink data packet path: After receiving the data packet sent by the communication peer to the terminal, the source ILCR forwards the data packet to the target ILCR through the forwarding tunnel, and the target ILCR first buffers the downlink data packet.

D74, same as D72.

Step 706: The source AGW sends an anchor DPF handover request message to the target AGW, and carries the connection information between the terminal and the communication peer.

The anchor DPF switch request message may also carry all the communication peers of the terminal at the same time.

AID-RID mapping information.

Thereafter, the uplink data packet path is the same as D72, except that the data packet is encapsulated by the target AGW. And maintain the connection information between the terminal and the communication peer.

Step 707 to step 708, the same steps 504 to 505;

After that, the downlink data packet path and the uplink data packet path of the terminal are as shown in D75 and D76. The D75 is the same as the D63. At the same time, the downlink data packet buffered on the target ILCR in the D73 is forwarded to the target AGW. . During the data packet transmission process, the target AGW maintains the connection information between the terminal and the communication peer.

Step 709 to step 716, in the same step 607 to step 614, the subsequent data message path D77 is the same as D65 and D78.

In the above process, the operation of the step 703 to the step 705 to notify the source ILCR to establish a forwarding tunnel with the target ILCR may also be performed after the step 708, or performed in parallel with the steps 706 to 708, without a necessary sequence relationship.

In this embodiment, after the tunnel between the target AGW and the target ILCR is established, the uplink data packet is forwarded from the tunnel, such as D76 and D78. Optionally, the uplink data packet may also be forwarded from the tunnel between the target AGW and the source AGW, that is, the data packet is forwarded from the target AGW to the source AGW, to the source ILCR, or from the target ILCR to the source ILCR. Forward tunnel forwarding. After the tunnel between the target AGW and the source AGW or the forwarding tunnel between the target ILCR and the source ILCR is released, the path in D76 is sent.

In the switching procedures of Embodiments 1 to 3 corresponding to FIG. 5 to FIG. 7 above, a dynamic tunnel based on the terminal is established between the AGW and the ILCR and between the ILCRs. The above embodiments can also be applied to a scenario in which a static tunnel is used between the AGW and the ILCR. In the handover process, a dynamic tunnel is no longer needed between the target AGW and the target ILCR, and the tunnel between the two is powered on. Has been created successfully, the other steps are the same. After the target AGW selects the target ILCR, it can use the tunnel notification target between the two. The ILCR has a terminal handover and sends the terminal's AID to the target ILCR. However, for Embodiments 1 to 3 and Embodiments 8 to 11, the target ILCR may not need the target AGW to perform the handover notification, and may check the uplink data packet to know that there is a terminal handover and the AID of the terminal, and accordingly, the target AGW selection. After the target ILCR, the data packet sent by the terminal can be forwarded to the target ILCR.

The switching procedures of the first to third embodiments corresponding to the above FIG. 5 to FIG. 7 are all explained by the change of the ILCR caused by the change of the anchoring AGW. When the ILCR has not changed, the source ILCR in the above process is combined with the target ILCR. Since there is no tunnel between the source ILCR and the target ILCR at this time, there is no need to establish or delete a tunnel between the two. System two

The Wimax network architecture of the system using the above identity identification and location separation technology is still shown in FIG. 3, including access service network (W-ASN) and connection service network (W-CSN), W-NSP and W-CSN. The function modules are also the same. The connection service network also includes an Identity Location Core Router (ILCR). Each ILCR has a data interface with a generalized forwarding plane that supports routing and forwarding of data messages by RID, but the AGW in the W-CSN and the ILCR in the W-NSP. The functions related to implementing identity and location separation are different from Embodiment 1.

In this system: The function of the AGW is basically the same as the prior art. The Identity Location Core Router (ILCR) is used to assign a RID to the terminal, register and deregister the RID of the terminal with the ILR, query the ILR for the RID of the communication peer, maintain the connection information between the terminal and the communication peer, initiate RID update to the peer, and maintain the terminal and The AID-RID mapping information of the communication peer end performs RID encapsulation and decapsulation on the data packet, and implements routing and forwarding of the data packet according to the RID.

As a change of the system, the AGW can also maintain the connection information between the terminal and the communication peer, and initiate RID update to the peer. In addition, it is also possible to change the function of registering and deregistering the RID of the terminal to the ILR by the AGW.

Related to switching, (unless otherwise specified, corresponding to embodiments 4 to 11)

The ILCR is configured to allocate a new location identifier (RID) to the terminal when the terminal is handed in, and save mapping information of the terminal identity (AID) and the new RID. After the terminal is cut out, the resource allocated for the terminal is released. ; and forward the data packet of the cut-in and cut-out terminal;

The AGW is used to implement the handover of the Wimax Access Service Network (W-ASN) of the terminal, and select the target ILCR for the handover terminal, and establish the tunnel when the tunnel for forwarding the data packet of the terminal is not established with the target ILCR. The data packet that is cut into the terminal is forwarded through the tunnel.

The ILCR or AGW is also used to register the new RID of the terminal with the handover terminal home ILR, and send a RID update notification to the gateway accessed by all communication peers of the terminal.

AGW includes:

The cut-out control module is configured to send an AGW handover request to the target AGW after the W-ASN anchor handover is completed, and release the resource allocated for the cut-out terminal after receiving the AGW handover response;

a cut-in control module for selecting a target ILCR after receiving an AGW switching request, at the target When the ILCR is different from the source ILCR, the target ILCR is notified that the target ICR has a terminal cut-in and carries the AID of the cut-in terminal, and the tunnel is established when the tunneled terminal data is not established with the target ILCR, and is also used to send the tunnel to the source AGW. AGW switching response;

The forwarding module is configured to forward and process data packets that are cut in and out of the terminal;

ILCR includes:

Cutting out the control module, after the terminal is cut out, releasing the resources allocated for the terminal;

a cut-in control module, configured to send an allocation notification to the RID distribution module and carry the AID of the cut-in terminal after receiving the notification of the terminal handover;

a RID allocation module, configured to allocate a new RID pointing to the ILCR to the terminal after receiving the allocation notification, and save mapping information of the terminal AID and the new RID;

AGW or ILCR also includes:

The RID registration module is configured to initiate a RID registration process after receiving the registration notification of the cut control module of the AGW or the ILCR, send a registration request to the indented terminal home identity register (ILR), and carry the AID and the new RID of the cut-in terminal;

The RID update module is configured to initiate an RID update process after receiving the update notification of the cut control module of the AGW or the ILCR, and send an RID update notification to the gateway accessed by all the communication peers of the terminal, carrying the AID of the terminal and the new RID. .

(corresponding to Examples 4 to 7)

The ILCR further includes a connection information maintenance module, which is used to maintain connection information between the terminal and the communication peer end, and includes correspondence information between the terminal AID and all communication peer AIDs;

The cut-out control module in the ILCR is further configured to send the connection information of the cut-out terminal and the communication peer directly to the target ILCR through the source AGW and the target AGW, and notify the connection information maintenance module to stop the maintenance of the connection information of the cut-out terminal. ;

The hand-in control module in the ILCR is further configured to notify the connection information maintenance module to start the maintenance of the connection information of the hand-in terminal after receiving and saving the connection information between the hand-in terminal and the communication peer end sent by the source ILCR, and send the connection information to the RID update module. Update notice The RID update module is located in the ILCR. When the RID update process is initiated, the IP address of the gateway accessed by the communication peer is determined according to the RID of all communication peers of the terminal, and the RID update notification is sent to the gateway accessed by the communication peer, and the terminal is carried. AID and new RID.

(corresponding to Examples 8 to 11)

The cut-out control module in the AGW is further configured to send the connection information of the cut-out terminal and the communication peer to the target AGW, and notify the connection information maintenance module to stop the maintenance of the connection information;

The cut-in control module in the AGW is further configured to receive and save the connection information between the hand-in terminal and the communication peer end sent by the source AGW, notify the connection information maintenance module to start maintaining the connection information, and send an update notification to the RID update module.

The RID update module is located in the AGW. When the RID update process is initiated, the AID of the communication peer of the terminal is queried to obtain the address of the gateway accessed by the peer, such as AGW and ILCR.

The ILCR further includes a mapping information maintenance module, which is used to maintain AID-RID mapping information of all communication peers of the terminal;

The cut-out control module in the ILCR is also used to send the AID-RID mapping information of all the communication peers of the cut-out terminal to the target ILCR directly or via the source AGW and the target AGW; the hand-in control module in the ILCR is also used for receiving and saving. The mapping information sent by the source ILCR to all communication peers of the terminal; or, after receiving the notification of the terminal handover, the handover control module in the ILCR notifies the mapping information maintenance module to reconstruct the AID-RID mapping information of all communication peers of the handover terminal. .

The AGW further includes a tunnel establishment module; the AGW's hand-in control module sends a tunnel establishment notification to the tunnel establishment module after selecting the target ILCR; the tunnel establishment module is configured to establish a tunnel establishment procedure for the handover terminal after receiving the tunnel establishment notification a dynamic tunnel with the target ILCR, notifying the target ILCR that the terminal is handed in and bringing the AID of the cut-in terminal to the target ILCR; or

The AGW also includes a tunnel establishment module, and the tunnel establishment module is configured to establish a static tunnel with the ILCR after power-on.

(corresponding to Examples 4 to 7)

The ILCR also includes a connection information maintenance module for maintaining connection information between the terminal and the communication peer. The information about the correspondence between the terminal AID and all communication peer AIDs is included;

The RID registration module is located in the ILCR. After receiving the new RID of the hand-in terminal returned by the RID distribution module, the ILCR's hand-in control module sends a RID registration request to the home terminal ILR of the hand-in terminal, and then obtains the source ILGW from the source ILCR through the target AGW and the source AGW. The connection information between the terminal and the communication peer; the 4艮 text forwarding module in the ILCR encapsulates the received data packet sent to the cut-out terminal, and then forwards the data packet to the source AGW; and sends the received data packet to the cut-in terminal. After the RID is encapsulated, it is forwarded to the target AGW;

After receiving the data packet sent to the cut-out terminal, the packet forwarding module in the AGW forwards the data packet to the target AGW through the forwarding tunnel with the target AGW. After receiving the data packet sent to the cut-in terminal, the packet forwarding module passes the data packet. A data channel cut into the terminal is sent to the cut-in terminal.

(corresponding to the fourth, fifth, eighth, and ninth)

After receiving the tunnel establishment notification for the handover terminal, the tunnel establishment module in the AGW establishes a first tunnel and a second tunnel with the target ILCR for the handover terminal;

The packet forwarding module in the ILCR receives the data packet sent to the cut-out terminal and forwards the data packet to the source AGW. The data packet is also RID-encapsulated when the connection information between the cut-out terminal and the communication peer is maintained. The RID encapsulation is performed after the interception terminal sent from the first tunnel or the generalized forwarding plane has not solved the RID encapsulated data packet, and is forwarded to the target AGW through the second tunnel;

The packet forwarding module in the AGW forwards the data packet sent to the cut-out terminal and forwards the data packet to the target.

AGW; after receiving the data message sent by the source AGW to the hand-in terminal, forwarding the data message to the target ILCR through the first tunnel; receiving the data message sent by the target ILCR to the hand-in terminal, and transmitting the data packet through the data channel with the hand-in terminal Go to the cut-in terminal.

(corresponding to the sixth embodiment, seven, ten, eleven)

The ILCR further includes a tunnel establishment module, configured to establish a forwarding tunnel with the source ILCR for the cut-in terminal, or establish a forwarding tunnel with the target ILCR for the cut-out terminal, and release the switch after the handover is completed. Forwarding tunnel

The packet forwarding module in the ILCR forwards the data packet sent to the cut-out terminal to the source AGW before the forwarding tunnel between the source and the target ILCR is established. After the forwarding tunnel is established, the forwarding tunnel is forwarded to the target ILCR. Transmitting the received data packet sent to the terminal to the target AGW; and when receiving the connection information between the terminal that is cut in or out and the communication peer, the data packet sent to the terminal is also solved. RID package;

(corresponding to the sixth embodiment, seven, ten, eleven)

The hand-in control module in the AGW is further configured to send the identifier information of the target ILCR to the source AGW; the cut-out control module in the AGW is further configured to send the identifier information of the target ILCR different from the source ILCR sent by the target AGW to the source ILCR. The tunnel establishment module in the ILCR establishes a forwarding tunnel between the target terminal and the target ILCR according to the identification information of the target ILCR; or

The identification information is sent to the target ILCR; the tunnel establishment module in the ILCR establishes a forwarding tunnel with the source ILCR for the handover terminal according to the identification information of the source ILCR.

The packet forwarding module in the AGW forwards the received data packet sent by the hand-in terminal to the source AGW; forwards the data packet sent by the cut-out terminal sent by the target AGW to the source ILCR; and the message in the ILCR The forwarding module performs RID encapsulation and forwards the data packet sent by the cut-out terminal sent by the source AGW to the generalized forwarding plane; or

The packet forwarding module in the AGW forwards the data packet sent by the intercepted terminal to the source AGW if it has not been established between the local AGW and the target ILCR. Otherwise, the packet is forwarded to the target ILCR. The data packet sent by the cut-out terminal sent by the target AGW is forwarded to the source ILCR; and the packet forwarding module in the ILCR sends the data packet sent by the cut-out terminal sent by the source AGW to the target AGW. The data packet sent by the terminal is forwarded to the generalized forwarding plane after RID encapsulation. The RID registration module is located in the ILCR; the hand-in control module in the ILCR sends an allocation notification to the RID distribution module and acquires a new RID allocated for the handover terminal, sends a registration notification to the RID registration module, and carries the AID and the new RID of the handover terminal. ; or

The RID registration module is located in the AGW; the hand-in control module in the ILCR sends an allocation notification to the RID allocation module and acquires a new RID allocated for the hand-in terminal, and then sends the new RID to the target AGW; the hand-in control module in the AGW receives After the target ILCR sends the new RID assigned to the cut-in terminal, it sends a registration notification to the RID registration module and carries the AID of the cut-in terminal and the new RID.

Embodiment 4:

Figure 8 is a flow chart of the network architecture of the WiMAX system using the identity identification and location separation technology in the system to implement the non-fixed anchor point switching. In the handover process, the forwarding tunnel between the AGWs is used for data forwarding, and the terminal and the communication pair are used by the AGW. The connection information of the terminal is forwarded to the target ILCR, which specifically includes the following steps:

Step 801 , the same step 501 ;

Thereafter, the downlink and uplink data of the terminal are the D81 and D82:

D81, the downlink data packet path: The source ILCR receives the data packet sent by the communication peer to the terminal, strips the RID encapsulated in the data packet, restores the format of the data packet sent by the communication peer, and forwards the data to the source. The AGW, the source AGW forwards the data packet to the target AGW through the data channel between the source AGW and the target AGW, and the target AGW sends the packet to the terminal through the terminal data channel.

D82, the uplink data packet path: the terminal sends the uplink data packet to the target base station, and the target base station forwards the data packet to the target AGW, and the target AGW forwards the data packet to the source AGW through the data channel between the source AGW and the target AGW. The source AGW is forwarded to the source ILCR, and the source ILCR performs RID encapsulation and forwarding on the data packet, and is sent to the gateway accessed by the peer end through the generalized forwarding plane.

During the data packet transmission process, the source ILCR maintains the connection information between the terminal and the communication peer.

Step 802: Send an anchor DPF handover trigger message to the source AGW when the target AGW is ready to initiate the anchor AGW relocation. This step is optional. Step 803: The source AGW sends an anchor DPF handover request message to the target AGW. The source AGW may send the anchor DPF after receiving the target AGW anchor DPF handover trigger message, or when the source AGW decides to initiate the anchor AGW relocation. Switch the request.

Step 804, the target AGW initiates a forwarding tunnel establishment process to the target ILCR, and establishes a dedicated downlink forwarding tunnel with the target ILCR for forwarding the downlink data packet of the terminal from the source ILCR, carrying the AID of the terminal;

The dedicated tunnel is established to enable the target ILCR to distinguish whether the data from the target AGW is the uplink data sent by the terminal or the destination AGW forwards the downlink data from the original AGW. In addition, if step 802 is not performed, the target AGW needs to select the target ILCR in this step.

Step 805: The target AGW selects the target ILCR, and initiates a tunnel establishment process to the target ILCR to establish a tunnel between the target AGW and the target ILCR.

Step 805a, the target ILCR allocates a new RID to the terminal, and locally stores mapping information of the AID of the terminal and the new RID.

Step 806 to step 810, the target ILCR interacts with the source AGW, the source AGW, and the source ILCR to obtain the connection information of the terminal and the communication peer, and obtains the AID-RID mapping information of all communication peers of the terminal and the terminal. User context

The connection information between the terminal and the communication peer, and the AID-RID mapping information of all communication peers of the terminal can be used as the content of the user context of the terminal. After the source ILCR sends the user context, connection information, and mapping information, the information may be deleted or deleted in step 817.

If the target ILCR does not obtain the AID-RID mapping information of all the communication peers of the terminal through the interaction, the mapping information may be reconstructed by querying the ILR in the subsequent data packet forwarding process.

Thereafter, the downlink and uplink data of the terminal are the D83 and D84:

D83, the downlink data packet path: after receiving the data packet sent by the communication peer to the terminal, the source ILCR forwards the data packet to the source AGW, and the source AGW forwards the data packet to the target AGW through the data channel between the source AGW and the target AGW. The target AGW is sent to the target ILCR through the dedicated downlink forwarding tunnel. The target ILCR performs RID encapsulation on the data packet, restores the format of the data packet sent by the communication peer, and then passes the data packet through the target AGW and the target. The tunnel between the ILCRs is forwarded to the target AGW, and the target AGW sends the packet to the terminal through the data channel of the terminal. D84, the uplink data packet path: the terminal sends the uplink data message to the target base station, the target base station forwards the data packet to the target AGW, the target AGW forwards the packet to the target ILCR, and the target ILCR encapsulates and forwards the data packet by RID. The forwarding plane is sent to the gateway that the peer accesses. During the data packet sending process, after the target ILCR obtains the connection information, the connection information between the terminal and the communication peer is maintained.

After the tunnel of the target ILCR and the target AGW is established in step 805, the downlink and uplink data packet paths of the terminal are the same as D83 and D84, but only for the downlink data, before step 808, the source ILCR decapsulates the data packet to Step 808: After the source ILCR receives the connection request from the source AGW and sends the connection information between the terminal and the communication peer, the source ILCR stops performing RID encapsulation on the data packet. Therefore, the target ILCR needs to determine whether the data message forwarded by the source ILCR has been decapsulated after step 806. If not, the RID encapsulation needs to be stripped, otherwise, it is directly forwarded to the target AGW. After step 808, the target ILCR maintains the connection information between the terminal and the communication peer. Certainly, after step 806, the connection information between the terminal and the communication peer end can be locally saved and maintained, and after receiving the connection information between the terminal and the communication peer end transmitted by the original ILCR, merge with the locally saved, and then merge the connected information. Carry out maintenance.

Step 811, after the target ILCR allocates a new RID to the terminal, initiates a RID registration process to the terminal home ILR, and sends the mapping information of the AID and the new RID of the terminal to the ILR through the RID registration request;

Step 812, the terminal belongs to the ILR to verify the validity of the AID in the RID registration request, and after the verification is passed, the saved AID-RID mapping information of the terminal is updated to the AID-RID mapping information in the request; the RID registration of the foregoing steps 811 and 812 The sequence of the process of obtaining the context flow performed by the process and steps 806 to 810 may be changed, or may be performed in parallel.

Step 813: The target AGW sends an RID update notification to the gateways accessed by all the peers according to the RID of the communication peer, and carries the mapping information of the AID and the new RID of the terminal.

After that, the downlink and uplink data packet paths of the terminal are D85 and D86:

D85, the downlink data packet path: After receiving the data packet sent by the communication peer to the terminal, the target ILCR strips the RID encapsulated in the data packet, restores the format of the data packet sent by the communication peer, and forwards the packet to the target. The AGW, the target AGW sends the message to the terminal through the terminal data channel. D86, the upstream data packet path, same as D84.

During the data packet transmission process, the target ILCR maintains the connection information between the terminal and the communication peer.

At this time, there may be a downlink data packet forwarded by the source ILCR, and the path is the same as D83. The target AGW can notify the peer again to update the AID-RID mapping information.

Step 814: The target AGW sends an anchor DPF handover response to the source AGW, and completes the handover of the anchor AGW.

This step can be initiated after the target AGW sends the user context information to the target ILCR in step 809.

Step 815, the source AGW release or the target AGW releases the data channel between the two;

In a variant, this step can also be initiated after step 810. In another variant, in order to better ensure the continuity of the data, the step may also be triggered by a timer. After the step 814, the timer is started, and the resource release of the step is triggered after the timer expires.

Step 816, the source AGW releases the tunnel with the source ILCR;

Step 818: The target AGW initiates a context reporting procedure to the target base station, and sends the new anchor AGW to the target base station. This step can be performed after step 810.

There is a variant of the above process. In step 804, a dedicated downlink forwarding tunnel is not separately established, and steps 806-810 need to be performed after step 811. When the dedicated downlink forwarding tunnel is not established, the downlink data packet from the original AGW is directly sent by the target AGW to the terminal, and does not pass the target ILCR. The new communication peer target ILCR cannot be known. Correspondingly, step 806- The 810 acquisition context process is executed after the RID registration process in step 811 is completed, because the message sent by the newly added communication peer is directly forwarded to the target ILCR. In this variant, D83 is the same as D81, and then step 817 is not required.

In this embodiment, after the tunnel between the target AGW and the target ILCR is established, the uplink data packet is forwarded from the tunnel, such as D84 and D86. Optionally, the uplink data packet can also be forwarded from the tunnel between the target AGW and the source AGW, that is, the data packet is forwarded from the target AGW to the source AGW and then to the source ILCR. Embodiment 5

In this embodiment, based on the WiMAX system of the system 2 application identity identification and location separation technology, the forwarding tunnel between the AGWs is used for data forwarding in the process of implementing no fixed anchor point handover, and the target ILCR obtains the terminal and communication directly from the source ILCR. The peer connection information is as shown in FIG. 9 , and specifically includes the following steps:

Step 901 , the same step 801 ;

Thereafter, the downlink and uplink data of the terminal are D91 and D92, and D91 is the same as D81 and D92. During the data packet transmission process, the source ILCR maintains the connection information between the terminal and the communication peer.

Step 902: When the target AGW is ready to initiate the anchor AGW relocation, send an anchor DPF handover trigger message to the source AGW, and this step is optional.

Step 903: After the source AGW receives the target AGW anchor DPF handover trigger message, or the source AGW decides to initiate the anchor AGW relocation, the source AGW sends an anchor DPF handover request message to the target AGW, where the message carries the identifier information of the source ILCR. ;

Step 904, the same step 804;

Step 905: The target AGW selects the target ILCR, and initiates a tunnel establishment process to the target ILCR to establish a tunnel with the target ILCR. If the source ILCR is different from the target ILCR, the identifier information of the source ILCR is sent to the target ILCR.

Step 906a, the same step 805a;

Step 906: The target ILCR obtains connection information between the terminal and the communication peer and/or mapping information of all communication peer AID-RIDs of the terminal to the source ILCR according to the identifier information of the source ILCR.

After that, the terminal uplink and downlink data will be D93, D94, D93 and D83, D94 and D84. During the data packet transmission process, the target ILCR maintains the connection information between the terminal and the communication peer.

Step 907 to step 914, the same step 811 to step 818; wherein D95, D96 and D85,

D86.

In the above process, if the downlink forwarding tunnel is not separately established in step 904, the step is required. The execution of step 906 is placed after step 907, at which time D93 is the same as D91.

In this embodiment, after the tunnel between the target AGW and the target ILCR is established, the uplink data packet is forwarded from the tunnel, such as D94 and D96. Optionally, the uplink data packet can also be forwarded from the tunnel between the target AGW and the source AGW, that is, the data packet is forwarded from the target AGW to the source AGW, and then to the source ILCR, until between the target AGW and the source AGW. The tunnel is released.

Embodiment 6

In this embodiment, based on the network architecture of the WiMAX system of the application identity identification and location separation technology of the system 2, the forwarding tunnel between the ILCRs is used for data forwarding in the process of implementing no fixed anchor point handover, and the inter-ILCR forwarding tunnel is initiated by the target ILCR. Establishing, and obtaining the connection information between the terminal and the communication peer to the source ILCR. The process is as shown in FIG. 10, and specifically includes the following steps:

Steps 1001 to 1003 are the same as steps 901 to 903, and D101 is the same as D91 and D102. During the data packet transmission process, the source ILCR maintains the connection information between the terminal and the communication peer.

Step 1004, the same step 905;

Step 1005: The target ILCR initiates a forwarding tunnel establishment process to the source ILCR according to the identification information of the source ILCR (which is different from the target ILCR) obtained in step 1004, establishes a tunnel with the source ILCR, and the target ILCR receives and saves the source ILCR. Connection information between the transmitted terminal and the communication peer and/or all communication peer AID-RID mapping information of the terminal;

If the AID-RID mapping information of the communication peer is not carried in this step, the target ILCR may re-establish the mapping information by querying the ILR during the subsequent data packet forwarding process.

Step 1005a, the same as step 906a.

Thereafter, the uplink and downlink data of the terminal is as shown in D103 and D104:

D103, the downlink data packet path: After receiving the data packet sent by the communication peer to the terminal, the source ILCR forwards the packet to the target ILCR through the forwarding tunnel, and the target ILCR strips the RID encapsulated in the data packet and returns to the communication peer. After the format of the data packet is forwarded to the target AGW, the target AGW sends the data packet to the terminal through the terminal data channel.

D104, same as D94. During the data packet transmission process, the target ILCR maintains the connection information between the terminal and the communication peer.

If the step 1005 is performed in parallel with the step 1004, that is, the target ILCR establishes a tunnel between the source ILCRs at the same time as the tunnel between the target and the target AGW, the step 1005 may be completed before the step 1004, and the downlink data packet needs to be at the target. The ILCR is cached first, and then sent to the target AGW after the completion of step 1004. At this time, the uplink data packet path is the same as D102.

Step 1006 to step 1011, the same step 907 to step 912; wherein D105 is the same as D95 and D106. During the data packet transmission process, the target ILCR maintains the connection information between the terminal and the communication peer. Step 1012: The source ILCR or the target ILCR initiates release of the data forwarding tunnel between the two; Step 1013, the same step 914.

In this embodiment, after the tunnel between the target AGW and the target ILCR is established, the uplink data packet is forwarded from the tunnel, such as D104 and D106. Optionally, the uplink data packet can also be forwarded from the tunnel between the target ILCR and the source ILCR.

Example 7

In this embodiment, based on the network architecture of the WiMAX system of the application identity identification and location separation technology of the system 2, the forwarding tunnel between the ILCRs is used for data forwarding in the process of implementing no fixed anchor point handover, and the inter-ILCR forwarding tunnel is initiated by the source ILCR. Established, the target ILCR obtains connection information between the terminal and the communication peer from the source ILCR.

The switching process in this embodiment is as shown in FIG. 11, and specifically includes the following steps:

Step 1101, the same step 1001. Among them, Di l i is the same as D101 and D112. During the data packet sending process, the source ILCR may update the connection information between the terminal and the communication peer according to the flow real-time detection mechanism;

Step 1102: When the target AGW is ready to initiate the anchor AGW relocation, select the target ILCR, send an anchor DPF handover trigger message to the source AGW, and carry the identifier information of the target ILCR in the message;

Step 1103: After the source AGW receives the target AGW anchor DPF switch trigger message, if the message is agreed Performing an anchor DPF switch sends an ILCR switch request to the source ILCR, such as the target ILCR being different from the source ILCR, and carrying the identification information of the target ILCR therein;

If the target ILCR is the same as the source ILCR, step 1104 may not be performed.

Step 1104: The source ILCR initiates a process of establishing a forwarding tunnel to the target ILCR according to the identifier information of the target ILCR, and establishes a forwarding tunnel with the target ILCR.

Step 1105: The source ILCR responds to the source AGW with an ILCR handover response.

Thereafter, the downlink and uplink data of the terminal are as shown in D113 and D114:

D113, the downlink data packet path: After receiving the data packet sent by the communication peer to the terminal, the source ILCR strips the RID encapsulated in the data packet and restores the format of the data packet sent by the communication peer. Forwarded to the target ILCR, the downlink data message needs to be cached first on the target ILCR.

D114, same as D112.

Step 1106: The source AGW sends an anchor DPF handover request message to the target AGW. Step 1107: The target AGW selects the target ILCR, and initiates a tunnel establishment process to the target ILCR to establish a forwarding tunnel with the target ILCR.

During the tunnel establishment process, the target ILCR may need to interact with the home AAA server to complete the authentication.

Step 1107a, the same step 1004a;

Step 1107b, the target ILCR obtains and saves the connection information between the terminal and the communication peer from the source ILCR and/or the AID-RID mapping information of all communication peers of the terminal;

If the target ILCR does not obtain the AID-RID mapping information of the communication peer, the target ILCR can reconstruct the mapping information by querying the ILR during the subsequent data packet forwarding process.

Thereafter, the terminal downlink and uplink data paths are D 115 and D 116:

D115, the same as D103; wherein the downlink data packet buffered on the target ILCR in D113 can also be forwarded to the target AGW.

D116, same as D104.

During the data packet transmission process, the target ILCR maintains the connection information between the terminal and the communication peer. Step 1108 to step 1115 are the same as steps 1006 to 1013. Among them D117, D118 with D105, D106.

In the above process, step 1103 to step 1105 may be performed after step 1108. At this time, 1107b does not need to be executed, the connection information between the terminal and the communication peer, and all communication peer AID-RID mapping information of the terminal can be transmitted to the target ILCR through step 1104.

In this embodiment, after the tunnel between the target AGW and the target ILCR is established, the uplink data packet is forwarded from the tunnel, such as D116 and D118. Optionally, the uplink data packet can also be forwarded from the tunnel between the target ILCR and the source ILCR.

Example eight

The flow of the network architecture of the WiMAX system based on the application identity identifier and the location separation technology in this embodiment can be implemented by referring to FIG. 8. In the handover process, the forwarding tunnel between the AGWs is used for data forwarding, and the source AGW is used. The terminal and communication peer connection information is forwarded to the target ILCR through the target AGW.

The handover procedure of this embodiment is basically the same as the handover procedure of the fourth embodiment, and the differences include the following points:

In step 805a, the target ILCR also needs to send the newly allocated RID to the target AGW in the tunnel establishment process;

In the process of acquiring the user context from the target ILCR in the source ILCR in steps 806-810, the source AGW obtains only the mapping information of all communication peer AID-RIDs from the source ILCR, and the connection information between the terminal and the communication peer and all the communication peers of the terminal. The AID-RID mapping information is sent to the target AGW together, and the target AGW only brings all the communication peer AID-RID mapping information of the terminal to the target ILCR; the acquisition of the mapping information is optional, and the connection information between the terminal and the communication peer is also The anchor DPF handover request carried by the source AGW to the target AGW may be carried in step 803.

In step 811, if the function of registering and deregistering the terminal RID with the ILR is completed by the AGW, the step is to register the new RID of the terminal with the ILR by the target AGW;

In step 813, the target AGW notifies the gateway accessed by the peer to notify the peer to access the ILCR to update the RID of the terminal. When the target AGW initiates the RID update process, it can query the local configuration according to the AID of the communication peer of the terminal, or perform a DNS query, or query the AAA server at the opposite end to obtain the address of the gateway accessed by the peer, such as AGW and ILCR. If the peer AGW receives the RID update notification, the AID and the new RID of the terminal are also transmitted to the corresponding peer ILCR, and the AID-RID mapping relationship of the terminal is updated by the peer ILCR.

In addition, the manner in which the AGW maintains the connection information between the terminal and the communication peer may be that the ILCR notifies the AGW of the connection information that needs to be updated according to the real-time detection result of the flow, and is saved and updated by the AGW. It can also be AGW self-maintenance through inspection.

Example nine

The network architecture of the WiMAX system and the functions of the AGW and the ILCR based on the application identity identification and the location separation technology are the same as those in the eighth embodiment, and the forwarding tunnel between the AGWs is used in the process of implementing the anchorless handover. Data forwarding, and the inter-ILCR forwarding tunnel establishment is initiated by the target ILCR, and the source AGW notifies the target AGW of the terminal and the communication peer connection information, and the source ILCR can forward the communication peer AID-RID mapping information to the target ILCR through the target AGW. .

The handover procedure of this embodiment can be basically the same as the handover procedure of the fifth embodiment with reference to FIG. 9, and the difference lies in the following points:

In step 905, the target AGW also needs to interact with the source AGW to obtain connection information between the terminal and the communication peer. The interaction step is the same as the steps 807-808, except that only the connection information between the terminal and the communication peer is obtained, and the data packet path in the interaction process is also the same as the path after step 806. In a variant of this embodiment, The connection information between the terminal and the communication peer may also be carried in the anchor DPF handover request sent by the source AGW to the target AGW in step 803.

In step 906, all communication peer AID-RID mapping information of the terminal is obtained only from the source ILCR. The target ILCR in step 906a also needs to bring the newly allocated RID to the target AGW in the tunnel establishment process;

In step 907, if the function of registering and deregistering the terminal RID with the ILR is completed by the AGW, the target AGW performs AID registration with the ILR;

In step 909, the target AGW notifies the peer access terminal through the gateway accessed by the communication peer end. The ILCR updates the RID of the terminal.

In addition, the way in which the AGW maintains the connection information between the terminal and the communication peer may be that the ILCR notifies the anchor AGW to perform maintenance according to the real-time detection result of the flow, or anchors the AGW to detect and maintain itself.

Example ten

The network architecture of the WiMAX system based on the application identity and location separation technology and the functions of the AGW and the ILCR are the same as those in the eighth embodiment, and the forwarding tunnel between the ILCRs is used in the process of implementing the anchorless handover. Data forwarding, and the inter-ILCR forwarding tunnel establishment is initiated by the target ILCR.

The handover procedure of this embodiment can be referred to FIG. 10, which is basically the same as the handover procedure of Embodiment 6. The difference lies in the following points:

In step 1005, all the communication peer AID-RID mapping information of the terminal is obtained from the source ILCR, and the target ILCR needs to notify the target AGW to obtain the connection information between the terminal and the communication peer from the source AGW, and the target AGW receives the notification from the source AGW. Obtain the connection information between the terminal and the communication peer. The data packet path in this interaction process is also the same as the path after step 806. In a variant of this embodiment, the connection information between the terminal and the communication peer may also be carried in the anchor DPF handover request sent by the source AGW to the target AGW in step 803.

The target ILCR in step 1005a also needs to send the newly allocated RID to the target AGW in the tunnel establishment process;

In step 1006, if the function of registering and deregistering the terminal RID with the ILR is completed by the AGW, the target AGW performs AID registration with the ILR;

In step 1008, the target AGW notifies the gateway accessed by the peer to notify the peer to access the ILCR to update the RID of the terminal.

In addition, the manner in which the AGW maintains the connection information between the terminal and the communication peer may be that the ILCR notifies the anchoring AGW to perform maintenance according to the real-time detection result of the flow, or anchors the AGW to detect and maintain itself. Embodiment 11

The network architecture of the WiMAX system based on the application identity and location separation technology and the functions of the AGW and the ILCR are the same as those in the eighth embodiment, and the forwarding tunnel between the ILCRs is used in the process of implementing the anchorless handover. Data forwarding, and the forwarding tunnel establishment between ILCRs is initiated by the source ILCR.

The handover procedure of this embodiment can be referred to FIG. 11 , which is basically the same as the handover procedure of the seventh embodiment. The difference lies in the following points:

In step 1104, the source ILCR only needs to notify the target AGW of all communication peer AID-RID mapping information of the terminal;

In step 1106, the source AGW needs to notify the target of the connection information between the terminal and the communication peer.

AGW, there is no need to perform step 1107b;

The target ILCR in step 1107a also needs to send the newly allocated RID to the target AGW in the tunnel establishment process;

In step 1108, if the function of registering and deregistering the terminal RID with the ILR is completed by the AGW, the target AGW performs AID registration with the ILR;

In step 1110, the target AGW notifies the gateway accessed by the peer to notify the peer to access the ILCR to update the RID of the terminal.

In the embodiments 4 to 11 corresponding to FIG. 8 to FIG. 11, the anchoring AGW change does not necessarily cause the ILCR to change. Therefore, the source AGW needs to identify the information according to the target ILCR, or the target AGW needs to determine whether the occurrence occurs according to the source ILCR identification information. The change of ILCR, when the ILCR has not changed, the source ILCR is integrated with the target ILCR. At this time, there is no tunnel between the source ILCR and the target ILCR, and there is no need to establish or delete the tunnel between the two. The target ILCR uses the RID that has been allocated for the terminal to encapsulate the RID of the data packet. After the target AGW establishes a dynamic tunnel with the target ILCR or the target AGW selects the target ILCR with the static tunnel established by the AGW, the source AGW can be Returns the AGW switch response. When the target ILCR is the same as the source ILCR, the terminal is connected to the ILCR, and there is no cut-in or cut-out, but the ILCR can also decide whether to allocate a new RID to the terminal according to the policy, when the terminal is assigned a new RID. In the above, the above flowchart can be used, and of course, there is no need to establish or delete a tunnel between the source ILCR and the target ILCR.

System three

4 is a schematic diagram of a network architecture of another Wimax system to which the above-described identity location separation technique is applied, in which the solid line indicates the connection of the bearer planes and the dashed line indicates the connection of the control planes. The Wimax network architecture includes an Access Service Network (W-ASN) and a Connected Service Network (W-CSN). The W-ASN has a data plane interface with the generalized forwarding plane, which is represented as a D1 interface. The W-CSN and the generalized forwarding plane may also have a data plane interface, denoted as D2. The generalized forwarding plane can be a packet data network that supports RID routing and forwarding of data messages.

The W-CSN has an original network element in the Wimax architecture such as an AAA proxy or server (AAA Proxy/Server), a billing server, and an interconnection gateway device, and an identity location register (IRR)/packet forwarding function (PTF) is also set. The ILR/PTF in each W-CSN constitutes a mapping forwarding plane.

The HA and / or W-CR (Core Router) in the W-CSN can be reserved or transferred to the AGW. The W-ASN includes a base station and an AGW, and the AGW expands the new functions required to implement the SILSN based on the functional entities (including the DPF functional entities) of the AGW in the Wimax architecture.

In this embodiment, the ILCR does not exist in the WiMAX network, and the AGW functions as an external data channel endpoint, which is used to allocate the RID to the terminal, register and deregister the RID of the terminal with the ILR, query the ILR for the RID of the communication peer, and maintain the terminal and the communication peer. The connection information, the maintenance of the AID-RID mapping information of the terminal and its communication peer, the RID encapsulation and decapsulation of the data packet, and the routing and forwarding of data packets according to the RID.

When switching:

The AGW is configured to allocate a new location identifier (RID) to the terminal when the terminal is handed in, save the mapping information of the terminal identity (AID) and the new RID, and register the RID of the terminal with the terminal home ILR. Sending a RID update notification to the gateway accessed by the terminal communication peer; after the terminal cuts out, The resources allocated to the terminal are released; and the data packets that are cut in or out are forwarded. Specifically, the AGW includes:

The cut-in control module is configured to: after receiving the AGW switching request, send an allocation notification to the location identifier (RID) allocation module, carry the hand-in terminal AID, and then send a registration notification to the RID registration module, and send an update notification to the RID update module, and Returning an AGW handover response to the source AGW;

The packet forwarding module is configured to perform RID encapsulation, RID encapsulation, and forwarding on the data packet that is cut into the terminal, and forward the data packet to the target terminal after receiving the data packet to be sent to the cut-out terminal, and switch to different stages of the handover. It is not the same as the data packet processing of the cut-out terminal.

The cut-out control module is further configured to bring the connection information of the cut-out terminal and the communication peer to the target AGW by using the AGW handover request or the message that is actively sent to the target AGW; or the hand-in control module is further used for the source The AGW sends a request for cutting in terminal information, and after receiving the request, the cut-out control module sends the connection information of the terminal and the communication peer to the target AGW;

The hand-in control module saves the received connection information and then sends the update notification. The AGW further includes a mapping information maintenance module, configured to maintain identity identification and location identification (AID-RID) mapping information of all communication peers of the accessed terminal;

The cut-out control module is further configured to send the AID-RID mapping information of all the communication peers of the cut-out terminal to the target AGW; the hand-in control module receives the AID-RID mapping information sent by the source AGW, and then initiates the RID update. Alternatively, the hand-in control module is further configured to query an identity location register (ILR) to reconstruct AID-RID mapping information of all communication peers that are cut into the terminal; When the RID update process is initiated, the RID update module determines an IP address of the gateway accessed by the communication peer according to the RID of all communication peers of the terminal, and sends an RID update notification to the gateway accessed by the communication peer, carrying Mapping information of the terminal AID and the new RID.

After receiving the connection information between the handover terminal and the communication peer end sent by the source AGW, the handover control module saves the connection information, and sends a second notification to the packet forwarding module in the AGW;

The packet forwarding module in the AGW, after receiving the first notification, performs RID encapsulation on the received downlink data packet of the cut-out terminal, and then forwards the packet to the target AGW, after receiving the first notification. Directly forwarding to the target AGW; before receiving the second notification, sending the downlink data packet of the cut-in terminal forwarded by the source AGW to the terminal directly, after receiving the second notification, after performing the RID encapsulation The downlink data packet that is forwarded to the target ILCR is de-encapsulated by the RID, and then sent to the terminal through the data channel of the terminal.

The connection service network includes an ILCR; the packet forwarding module in the AGW forwards the received uplink data packet of the cut-out terminal to the source ILCR, and also sends the uplink datagram before receiving the first notification. The RID encapsulation is performed on the received uplink data packet, if the tunnel with the target ILCR is not established, the uplink data packet is forwarded to the source AGW, and after receiving the second notification, The uplink data packet is RID-encapsulated. If a tunnel with the target ILCR is established, the uplink data packet is RID-encapsulated and then forwarded to the target ILCR.

The AGW has a data interface to the generalized forwarding plane; the packet forwarding module in the AGW forwards the received uplink data packet of the terminal to the generalized forwarding plane after being encapsulated by the RID; Before the notification, the received uplink data packet sent by the terminal is directly forwarded to the source AGW. After receiving the second notification, the uplink data packet is RID encapsulated and then forwarded to the generalized forwarding plane.

Example twelve

The network architecture of the WiMAX system of the application access identifier and the location identification separation technology of the system 3 implements a flowchart of the non-fixed anchor point switching, and uses the forwarding tunnel between the AGWs to perform data forwarding in the handover process, which includes the following steps. : Step 1201, the same as step 501.

After that, the downlink and uplink data packet paths of the terminal are as shown in D121 and D122.

D121, the downlink data packet path: After receiving the data packet sent by the communication peer to the terminal, the source AGW strips the RID encapsulated in the data packet and restores the format of the data packet sent by the communication peer. The data channel between the AGW and the target AGW forwards the data packet to the target AGW, and the target AGW sends the data packet to the terminal through the terminal and the data channel.

D122, the uplink data packet path: the terminal sends the uplink data message to the target base station, and the target base station forwards the data packet to the target AGW, and the target AGW forwards the data packet to the source AGW through the data channel between the source AGW and the target AGW. The source AGW encapsulates and forwards the data packet by RID, and the data packet is sent to the gateway accessed by the communication peer through the generalized forwarding plane.

During the data packet transmission process, the source AGW maintains the connection information between the terminal and the communication peer.

Step 1202 to step 1204, the same as step 502 to step 504. After that, the terminal uplink and downlink data will be D123, D124:

D123, the downlink data packet path: After receiving the data packet sent by the communication peer to the terminal, the source AGW forwards the data packet to the target AGW through the data channel between the source AGW and the target AGW, and the target AGW strips the data. After the RID encapsulated in the packet is restored to the format of the data packet sent by the communication peer, the target AGW sends the data packet to the terminal through the data channel of the terminal.

D124, the uplink data packet path: the terminal sends the uplink data message to the target base station, the target base station forwards the data packet to the target AGW, and the target AGW performs RID encapsulation and forwarding on the data packet, and is sent to the communication pair through the generalized forwarding plane. Enter the gateway.

Steps 1205 to 1207 are the same as steps 506 to 508; thereafter, the uplink and downlink data of the terminal is D125 and D126:

D1205, downlink data packet path: After receiving the data packet sent by the communication peer to the terminal, the target AGW strips the RID encapsulated in the data packet and restores the format of the data packet sent by the communication peer. The message is then sent to the terminal through the terminal data channel.

D1206, uplink data packet path, same as D124. During the data packet transmission process, the target AGW maintains the connection information between the terminal and the communication peer.

At this time, there may be a data packet forwarded by the source AGW, which may be caused by the gateway that the communication peer access fails to update the terminal AID-RID mapping information in time, or because the gateway connected to the communication peer does not receive the data. When the terminal AID-RID mapping information is updated, the target AGW may notify the peer to update the AID-RID mapping information again. At this time, the downlink data path is the same as D123.

Step 1208 to step 1209, the same step 509, step 510;

Step 1210, the same step 512.

In the above process, in step 1203, the connection information between the terminal and the communication peer is not transmitted, and the information needs to be obtained by the target AGW to the source AGW after step 1207.

Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any particular combination of hardware and software.

To simplify the description, the above description is not only applicable to WiMAX networks, but also to other mobile communication networks. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

The above method and system apply the mobile communication network with the separation identifier and the location identifier to the WiMAX network, which can overcome the problem that the handover in the existing WiMAX system requires the support of a fixed anchor point, and reduces the path of the data packet. Round trips reduce transmission delay and bandwidth waste, and can also achieve the dual identity of IP addresses.

Claims

1. A method for switching a fixed anchor point of a global microwave interconnection access (Wimax) system, comprising:

After the terminal completes the handover of the Wimax access service network anchor, the source access gateway (AGW) sends an AGW handover request to the target AGW;

2. The switching method according to claim 1, wherein

3. The switching method according to claim 1, wherein

A data interface is provided between the AGW and the generalized forwarding plane in the Wimax access service network. The generalized forwarding plane supports routing and forwarding of data packets with the RID as the source address and the destination address. The target AGW allocates the pointing address to the terminal. After AGW's new RID, it also initiated RID more The new process sends an RID update notification to the gateway of all communication peers of the terminal, carrying the AID of the terminal and the new RID.

4. The switching method according to claim 2 or 3, wherein

During the handover process, the source AGW brings the connection information of the terminal and the communication peer to the target AGW through the AGW handover request or the message that is actively sent to the target AGW. Alternatively, the source AGW receives the target AGW pair. After the request of the terminal information, the connection information of the terminal and the communication peer is sent to the target AGW;

5. The switching method according to claim 2 or 3, wherein

6. The switching method according to claim 5, wherein

7. The switching method according to claim 2, wherein

The tunnel between the target AGW and the target ILCR is a dynamic tunnel of the terminal established by the tunnel establishment process after the target AGW selects the target ILCR; or The tunnel between the target AGW and the target ILCR is a static tunnel established after the two are powered on. The target ILCR learns that the terminal switches and obtains the AID of the terminal according to the notification of the target AGW or by checking the data packet.

8. The switching method according to claim 2, wherein

The switching method according to claim 2, wherein, in the switching process: when the source ILCR is different from the target ILCR, a forwarding tunnel is established between the two ILCRs, and the forwarding tunnel is released after the handover is completed;

After the forwarding tunnel between the two ILCRs is established, the source ILCR receives the data packet sent by the communication peer to the terminal, and then forwards the data packet to the target ILCR through the forwarding tunnel, and the target ILCR forwards or caches the packet to the target. The AGW, the target AGW, sends the data packet to the terminal through a data channel with the terminal.

10. The handover method according to claim 9, wherein, in the switching process, the source AGW transmits identification information of the source ILCR to the target AGW, when the selected target ILCR is different from the source ILCR, Retransmitting the identification information of the source ILCR to the target ILCR, the target ILCR establishing a forwarding tunnel to the source ILCR; or

After the target AGW selects the target ILCR, the identifier information of the target ILCR is sent to the source AGW. When the target ILCR is different from the source ILCR, the identifier information of the target ILCR is resent to the source ILCR. The ILCR establishes a forwarding tunnel to the target ILCR. The switching method according to claim 8 or 9 or 10, wherein In the handover process, after receiving the downlink data packet sent by the communication peer end to the terminal through the generalized forwarding plane, the target ILCR forwards the data packet to the target through the tunnel between the target ILCR and the target AGW. The AGW, after the target AGW encapsulates the RID of the data packet, sends the data packet to the terminal through the data channel of the terminal. The handover method according to claim 3, wherein, in the handover process, after receiving the data packet sent by the communication peer to the terminal, the source AGW passes the data through the forwarding tunnel with the target AGW. The packet is forwarded to the target AGW, and the target AGW sends the data packet to the terminal through a data channel between the terminal and the terminal;

13. The switching method according to claim 8, 9, 10 or 12, wherein

The switching method according to claim 8, 9, 10 or 12, wherein

After the target AGW sends the RID update notification to the gateway accessed by the communication peer of the terminal, if the data packet sent by the communication peer to the terminal that is forwarded by the source ILCR is also received, the communication is sent to the communication again. The peer access gateway sends the RID update notification.

15. The switching method according to claim 2, wherein

The connection information between the AGW maintenance terminal and the communication peer end in the Wimax system includes the correspondence relationship between the terminal AID and all communication peer AIDs; after completing the handover of the Wimax access service network anchor, the terminal sends the connection The data packet path of the communication peers entering different ILCRs is as follows: Before the target AGW maintains the connection information between the terminal and the communication peer, the data message sent by the terminal is forwarded to the source AGW, and the source AGW performs RID encapsulation and forwarding on the data packet. The source ILCR and/or the mapping forwarding plane are forwarded to the generalized forwarding plane, and then sent to the gateway accessed by the communication peer through the generalized forwarding plane;

16. The switching method according to claim 3, wherein

After the target AGW maintains the connection information between the terminal and the communication peer, the data packet sent by the terminal is RID encapsulated and queried, and then directly forwarded to the generalized forwarding plane; or forwarded to the source AGW first, and then forwarded to the generalized AGW. The plane is delivered to the gateway of the communication peer. The switching method according to claim 15 or 16, wherein

After the target AGW saves the connection information sent by the source AGW, the connection information is maintained, or the target AGW starts to maintain the connection information after receiving the data packet sent by the terminal. And after receiving the connection information sent by the source AGW, combining the locally maintained connection information and the sent connection information. The switching method according to claim 2, wherein the target AGW selects a target ILCR The way is one of the following ways:

Manner 1: The target AGW interacts with the AAA server of the terminal directly or by visiting the AAA server to obtain the ILCR information that the target AGW can connect, and selects an ILCR as the target ILCR;

Method 3: Target The AGW selects the target ILCR according to its own configuration information. 19. The switching method according to claim 2, wherein

The switching method according to claim 2 or 3, wherein

The resources allocated by the source AGW and the source ILCR for the terminal include at least a forwarding tunnel between the source AGW and the target AGW, a tunnel established between the source AGW and the source ILCR for the terminal, and the source AGW saves The connection information between the terminal and the communication peer. The switching method according to claim 1, 2 or 3, wherein

The AGW handover request sent by the source AGW to the target AGW is an anchor data channel function (DPF) handover request; The AGW handover response sent by the target AGW to the source AGW is an anchor DPF handover response, and then the target AGW initiates a context report procedure to the target base station, and sends the information of the AGW as the new anchor AGW information to the target base station.

22. A global microwave interconnection access (Wimax) system capable of switching without fixed anchor points, comprising an access service network and a connection service network, where the access service network includes a base station and an access gateway

(AGW), where

The AGW is set to: when the terminal is handed in, assign a new location identifier (RID) to the terminal and save mapping information of the terminal identity (AID) and the new RID to the terminal identity location register (ILR). The RID of the terminal is registered, and the RID update notification is sent to the gateway that the terminal communicates with the peer end; after the terminal is cut out, the resource allocated to the terminal is released; and the data packet of the cut-in or the cut-out terminal is forwarded.

The Wimax system according to claim 22, wherein the AGW comprises: a cut-out control module, configured to: after the Wimax access service network (W-ASN) anchors the handover, send to the target AGW After the AGW handover request receives the AGW handover response, the resource allocated for the terminal is released;

The cut-in control module is configured to: after receiving the AGW switching request, send an allocation notification to the location identification (RID) allocation module, carry the hand-in terminal AID, and then send a registration notification to the RID registration module, and send an update notification to the RID update module. And returning an AGW handover response to the source AGW;

The RID allocation module is configured to: allocate a new RID pointing to the AGW to the terminal after receiving the allocation notification, and save mapping information of the terminal AID and the new RID;

The packet forwarding module is configured to perform RID encapsulation, de-RID encapsulation, and forwarding on the data packet that is cut into the terminal, and forward the data packet to the target side after receiving the data packet to be sent to the cut-out terminal. 24. The Wimax system according to claim 23, wherein

The AGW further includes a tunnel establishment module. The AGW of the AGW is further configured to: after receiving the AGW handover request, select a target ILCR, and send a tunnel establishment notification to the tunnel establishment module; the tunnel establishment module is configured to: After receiving the tunnel establishment notification, establish a dynamic tunnel with the target ILCR for the cut-in terminal; or

25. The Wimax system according to claim 23, wherein

A data interface is provided between each AGW and the generalized forwarding plane. The generalized forwarding plane supports routing and forwarding of data packets with the RID as the source address and the destination address. The Wimax system according to claim 23 or 24 or 25, wherein

The hand-in control module is further configured to: save the received connection information and then send the update notification. 27. The Wimax system according to claim 23 or 24 or 25, wherein

The AGW further includes a mapping information maintenance module, configured to: maintain identity identification and location identification (AID-RID) mapping information of all communication peers of the accessed terminal; The cut-out control module is further configured to: send AID-RID mapping information of all communication peers of the cut-out terminal to the target AGW; the hand-in control module is configured to: after receiving the AID-RID mapping information sent by the source AGW, Re-initiating the RID update process; or, the hand-in control module is further configured to: query the identity location register (ILR), and reconstruct AID-RID mapping information of all communication peers that are cut into the terminal;

The RID update module is further configured to: when initiating the RID update process, determine an IP address of the gateway accessed by the communication peer according to the RID of all communication peers of the terminal, and send a RID to the gateway accessed by the communication peer The update notification carries the mapping information of the terminal AID and the new RID.

28. The Wimax system according to claim 24 or 25, wherein

The packet forwarding module in the AGW is further configured to: after receiving the downlink data packet sent to the cut-out terminal, forward the packet to the target AGW through the forwarding tunnel with the target AGW, and receive the downlink sent to the cut-in terminal. The data message is sent to the terminal through the data channel with the terminal.

29. The Wimax system according to claim 28, wherein

30. The Wimax system according to claim 29, wherein

The hand-in control module is further configured to: send identification information of the target ILCR to the source AGW; the cut-out control module is further configured to: when the received target ILCR is different from the source ILCR, the target is The identifier information of the ILCR is sent to the source ILCR; the tunnel establishment module in the ILCR is configured to: establish a forwarding tunnel to the target ILCR according to the identifier information of the received target ILCR.

31. The Wimax system according to claim 26, wherein

The packet forwarding module in the AGW is configured to: before receiving the first notification, perform RID encapsulation on the received downlink data packet of the cut-out terminal, and then forward the packet to the target AGW, and receive the foregoing After receiving the second notification, the downlink data packet forwarded to the source AGW is directly sent to the terminal, and after the second notification is received, the RID is solved. After being encapsulated, the data packet is sent to the terminal. The downlink data packet that is forwarded to the target ILCR is de-encapsulated by the RID, and then sent to the terminal through the data channel of the terminal. 32. The Wimax system according to claim 31, wherein

The connection service network includes an ILCR; the packet forwarding module in the AGW is configured to: forward the received uplink data packet of the cut-out terminal to the source ILCR, and before receiving the first notification, The uplink data packet is RID-encapsulated; if the uplink data packet sent by the intercepted terminal is not established, the tunnel is forwarded to the source AGW, and the second notification is received. Then, the uplink data packet is RID-encapsulated. If the tunnel with the target ILCR is established, the uplink data packet is RID-encapsulated and then forwarded to the target ILCR.

33. The Wimax system according to claim 31, wherein

The AGW has a data interface to the generalized forwarding plane. The packet forwarding module in the AGW is configured to: perform the RID encapsulation of the received uplink data packet of the cut-out terminal and forward it to the generalized forwarding plane; Before the second notification, the received uplink data packet sent by the terminal is directly forwarded to the source AGW. After receiving the second notification, the uplink data packet is RID encapsulated and then forwarded to the generalized forwarding plane. 34. The Wimax system according to claim 24, wherein the hand-in control module is configured to: select a target ILCR in one of the following manners:

In a first mode, the hand-in control module interacts with the AAA server that is connected to the terminal to obtain the ILCR information that the target AGW can connect to, and selects an ILCR as the target ILCR;

Manner 3: The hand-in control module selects a target ILCR according to the configuration information of the AGW.

35. The Wimax system according to claim 23 or 24 or 25, wherein

The cut-out control module is configured to: the AGW handover request sent to the target AGW is an anchor data channel function (DPF) handover request; the handover control module is configured to: the AGW handover response sent to the source AGW is an anchor DPF handover Respond