WO2011088607A1 - 实现无固定锚点切换的wimax系统及其切换方法 - Google Patents

实现无固定锚点切换的wimax系统及其切换方法 Download PDF

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Publication number
WO2011088607A1
WO2011088607A1 PCT/CN2010/001697 CN2010001697W WO2011088607A1 WO 2011088607 A1 WO2011088607 A1 WO 2011088607A1 CN 2010001697 W CN2010001697 W CN 2010001697W WO 2011088607 A1 WO2011088607 A1 WO 2011088607A1
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Prior art keywords
terminal
agw
target
ilcr
source
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PCT/CN2010/001697
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English (en)
French (fr)
Inventor
霍玉臻
吴强
符涛
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中兴通讯股份有限公司
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Publication of WO2011088607A1 publication Critical patent/WO2011088607A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/12Reselecting a serving backbone network switching or routing node
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W60/00Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W92/00Interfaces specially adapted for wireless communication networks
    • H04W92/16Interfaces between hierarchically similar devices
    • H04W92/24Interfaces between hierarchically similar devices between backbone network devices

Definitions

  • Wimax system for realizing unfixed anchor point switching and switching method thereof
  • the present invention relates to handover in the field of communication technologies, and in particular, to a Wimax system for implementing fixed anchor point switching and a handover method thereof. Background technique
  • IP Transmission Control Protocol/Internet Protocol
  • 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.
  • GTP GPRS Tunneling Protocol
  • LTE Long Term Evlution
  • GW acts as the mobile anchor of the terminal; in the Wimax network, Mobile IP (MIP) is used, and the Home Agent (HA) is used as an anchor point.
  • MIP Mobile IP
  • HA Home Agent
  • 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.
  • the IP address of the host changes, not only the route needs to change, but also the access identifier of the communication terminal host changes. This can result in a heavier routing load, and changes in host identification can cause disruptions to applications and connections.
  • the purpose of identification and location separation 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 of mobility, multiple townships, IP addresses, and mitigation of routes. Support for issues such as load and mutual visits between different network areas in the next generation Internet.
  • the existing identity identification and location separation framework Host Identity Protocol (HIP), Name Separation Network Protocol (LISP), etc. are a network framework constructed to overcome this deficiency of existing network technologies.
  • the host-based HIP needs to make major changes to the terminal and upper-layer services, and the deployment is difficult. The two ends of the communication move simultaneously and the location update phase requires the network to participate in maintaining the communication link. Otherwise, packet loss will occur.
  • Network-based LISP for mobility and multi-homedness, is a problem that has been solved after identity and location separation. There is no specific solution and implementation method.
  • FIG 1 shows the network architecture of the existing microwave access global interworking (Wimax) system.
  • Wimax microwave access global interworking
  • the prior art Wimax system generally consists of three parts: a terminal, a Wimax Access Service Network (WMD). -ASN) and Wimax Connect Service Network (W-CSN).
  • WMD Wimax Access Service Network
  • -ASN Wimax Access Service Network
  • W-CSN Wimax Connect Service Network
  • 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.
  • AAA Access, Authorization and Accounting
  • NSP Network Service Operator
  • L3 connections of WiMAX terminals radio resource management
  • W-ASN also needs to support the following functions: W-CSN Anchored MM, Idle Mode, and Idle Mode operation;
  • the 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 HA, AAA proxy or service (AAA Proxy/Server), accounting server, interconnection gateway device, etc. Among them, the operator that manages the W-CSN is called the 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 license control, tunnel maintenance between W-ASN and W-CSN, End-user billing and billing, roaming between W-CSNs, mobility management between W-CSNs, and WiMAX services.
  • 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 the 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.
  • W-ASN anchored handover 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;
  • DPF anchor data channel function
  • the W-CSN anchored handover is anchored by the home agent.
  • 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.
  • the handover in the existing WiMAX system requires the support of fixed anchor points to complete, and the introduction of the fixed anchor point brings about the problem of packet path bypass, which increases the transmission delay and bandwidth waste.
  • the technical problem to be solved by the present invention is to provide a WiMAX system for switching without fixed anchor point and a switching method thereof, so as to realize no fixed mapping switching, reduce path detour of data packets, and reduce transmission delay and bandwidth waste.
  • the present invention provides a method for switching a fixed anchor point of a Wimax system, including:
  • the source access gateway sends an AGW handover request to the target AGW;
  • the target AGW After receiving the source AGW handover request, the target AGW allocates a new location identifier to the terminal, and saves mapping information of the terminal identity identifier and the new location identifier.
  • the target AGW initiates a location identifier registration process, and updates a location identifier of the terminal saved by the terminal home identity register (ILR); and the terminal home ILR receives a trigger message of the update communication peer, and initiates a location identifier update process to the terminal.
  • All gateways connected to the peer end send a location identifier update notification, carrying the identity identifier of the terminal and a new location identifier;
  • the target AGW sends an AGW handover response to the source AGW to complete the handover of the fixed anchor point.
  • the source AGW releases the resource allocated to the terminal, and the data packet between the terminal and the communication peer is forwarded by the target AGW.
  • 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 with a location identifier as a source address and a destination address. Routing and forwarding of packets;
  • ILCR identity location core router
  • the method further includes: after the target AGW receives the AGW handover request, selecting the target ILCR, The tunnel is established when the tunnel of the terminal data is not established with the target ILCR; after the handover is completed, the source ILCR releases the resource allocated to the terminal, and the packet between the terminal and the communication peer passes the The target AGW and the target ILCR are forwarded.
  • a data interface is provided between the AGW and the generalized forwarding plane in the Wimax access service network, and the generalized forwarding plane supports routing and forwarding of data packets with the location identifier as the source address and the destination address.
  • the method also includes:
  • the AGW in the Wimax system acquires and maintains connection information of the terminal that is not updated to the terminal belonging to the ILR and the communication peer according to the received data packet of the terminal;
  • the source AGW or the target AGW sends the connection information of the terminal and the communication peer to the terminal home ILR through the communication peer information notification request;
  • the terminal home ILR After receiving the location identifier registration request sent by the destination AGW, the terminal home ILR initiates a location identifier update procedure according to the received terminal and the communication peer connection information, and maintains the connection information.
  • the method also includes:
  • the AGW in the Wimax system acquires and maintains connection information of the terminal that is not updated to the terminal belonging to the ILR and the communication peer according to the received data packet of the terminal;
  • the source AGW or the target AGW sends the connection information of the terminal and the communication peer to the terminal home ILR through the communication peer information notification request timing or quantitatively;
  • the source AGW After receiving the handover response sent by the destination AGW, the source AGW sends a communication peer information transmission request to the terminal home ILR, where the source AGW does not update the connection information between the terminal end of the terminal belonging to the ILR and the communication peer;
  • the terminal AGW When the target AGW initiates the location identification registration process, the terminal AGW does not update the connection information of the terminal and the communication peer end that is not updated by the terminal to the ILR, and sends the connection information to the terminal home ILR;
  • the terminal home ILR After receiving the request from the communication peer end information transmission request sent by the source AGW or the location identifier registration request sent by the destination AGW, the terminal home ILR initiates a location identifier update process according to the received terminal and the communication peer connection information, And maintaining the connection information.
  • the method also includes:
  • the AGW in the Wimax system maintains identity identification and location identifier mapping information of all communication peers of the accessed terminal;
  • the source AGW or the destination AGW sends the identity-location identification mapping information of all communication peers of the terminal to the terminal home ILR; the target AGW that maintains the communication peer information obtains the communication by:
  • the peer identity-location identifier mapping information is: after receiving the downlink data packet sent to the hand-in terminal, obtaining the identity information of the communication peer information in the packet-location identifier mapping information; or
  • the identity-location identification mapping information is sent from the communication peer-to-home ILR to the communication peer; or the identity-location identification mapping information of the communication peer is obtained by querying from the source AGW.
  • the communication peer information includes connection information between the terminal and the communication peer, and the method further includes:
  • the AGW acquires and maintains connection information between the terminal not connected to the terminal home ILR and the communication peer according to the received data message of the terminal, and transmits connection information between the terminal and the communication peer to the terminal home ILR;
  • the gateway that the communication peer accesses is determined according to the mapping information of the communication peer identity-location identifier, the local configuration information, or the DNS query, and is accessed by the communication peer.
  • the gateway sends a location identifier update notification, carrying mapping information of the terminal identity identifier and the new location identifier;
  • the gateway accessed by the communication peer After receiving the location identifier update notification, the gateway accessed by the communication peer end updates the saved identity-location identifier 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;
  • 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 there is a terminal handover and obtains the identity of the terminal according to the notification of the target AGW or by checking the data packet.
  • the method also includes:
  • the source ILCR receives the data packet sent by the communication peer to the terminal and forwards the data packet to the source AGW, and the source AGW sends the data packet through the forwarding tunnel with the target AGW.
  • the file is forwarded to the target AGW, and the target AGW sends the data packet to the terminal through the data channel of the terminal.
  • the method further includes: during the unfixed anchor point switching process,
  • 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 Transmitting a data packet to the terminal by a data channel between the terminals;
  • 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.
  • the method further includes: during the unfixed anchor point switching process,
  • the source AGW sends the identification information of the source ILCR to the target AGW.
  • 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
  • the target AGW selects the target ILCR
  • the identifier information of the target ILCR is sent to the source AGW.
  • 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 method also includes:
  • the target ILCR receives the downlink data packet sent by the communication peer end to the terminal through the generalized forwarding plane, and then reports the data packet through the tunnel between the target ILCR and the target AGW.
  • the file is forwarded to the target AGW, and the target AGW encapsulates the data packet with the location identifier, and then sends the data packet to the terminal through the data channel of the terminal.
  • the method further includes: during the unfixed anchor point switching process, 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 message to the terminal;
  • the target AGW 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.
  • the method also includes:
  • the source AGW performs a solution location label encapsulation on the received downlink data packet of the terminal; After the AGW handover request is sent to the target AGW, the target AGW performs the location location encapsulation of the downlink data packet of the terminal forwarded by the source AGW.
  • the method also includes:
  • the gateway connected to the communication peer is determined according to the new communication peer information, and the communication peer is The accessed gateway sends the location identifier update notification again;
  • the gateway accessed by the communication peer or the terminal home ILR notifies the communication peer home ILR to update the terminal identity identification-location identification mapping information.
  • the method further includes:
  • the target AGW Before the target AGW establishes a dynamic tunnel with the target ILCR, or before the target AGW selects the target ILCR that has a static tunnel with the local AGW, the target AGW forwards the received data packet sent by the terminal to the source AGW.
  • the source AGW performs location identification encapsulation and forwarding on the data packet, and forwards the data packet to the generalized forwarding plane through the source ILCR and/or the mapping forwarding plane, and then sends the gateway accessed by the communication peer end through the generalized forwarding plane;
  • the target AGW After the target AGW establishes a dynamic tunnel with the target ILCR or after the target AGW selects the target ILCR with the static tunnel established by the local AGW, the target AGW performs location identification encapsulation on the uplink data packet sent by the target, and passes the following A path sends the gateway to the communication peer access: Forwarding to the target ILCR through a tunnel with the target ILCR, and then delivering the gateway accessed by the communication peer through the mapping forwarding plane and/or the generalized forwarding plane; or
  • It is forwarded to the source ILGW through the tunnel with the source AGW and then forwarded to the source ILCR, and then sent to the gateway accessed by the communication peer through the mapping forwarding plane and/or the generalized forwarding plane.
  • the method further includes:
  • the target AGW Before receiving the handover request sent by the source AGW, the target AGW forwards the received data packet to the source AGW, and the source AGW performs location identification encapsulation, query, and forwarding to the generalized forwarding. Plane, served to the gateway of the communication peer access;
  • the target AGW After receiving the handover request sent by the source AGW, the target AGW forwards the data packet sent by the terminal to the generalized forwarding plane, and then forwards the data packet to the generalized forwarding plane.
  • the gateway that accesses the communication peer.
  • the step of the target AGW selecting the target ILCR includes:
  • 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; or
  • the terminal home AAA server When the terminal is initially connected to the network, the terminal home AAA server notifies the source AGW of the ILCR that the terminal is allowed to access directly or through the visited AAA server, and the source AGW allows the terminal to access the ILCR during the unfixed anchor point handover process. Notifying the target AGW that the target AGW selects an ILCR as the target ILCR; or
  • the target AGW selects the target ILCR based on its own configuration information.
  • the ILR is associated with the AAA server and is represented as AAA/ILR.
  • the AAA/ILR stores the identity-location identification mapping information of the home terminal.
  • the target AGW allocates a new location identifier to the terminal
  • the target ILCR initiates a tunnel establishment process to implement registration of the location identifier; the target AGW brings the identity of the terminal and the new location identifier to the target ILCR in the tunnel establishment process, and the target ILCR reuses the AAA/ILR of the terminal to the terminal.
  • the identity of the terminal and the new location identifier are brought to the terminal AAA/ILR, and the location identity update in the identity-location identification mapping information of the terminal to which the terminal belongs to the AAA/ILR is saved.
  • the new location identifier received.
  • the resource allocated by the source AGW and the source ILCR for the terminal at least includes: 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 The connection information between the terminal and the communication peer saved by the AGW.
  • the AGW handover request sent by the source AGW to the target AGW is an anchor data channel function (DPF) handover request.
  • DPF anchor data channel function
  • the AGW handover response sent by the target AGW to the source AGW is an anchor DPF handover response.
  • the present invention also provides a Wimax system for 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), and the connection service network includes an identity location. Register (ILR);
  • the AGW is set to: when the terminal is handed in, assign a new location identifier to the terminal and save mapping information of the terminal identity and the new location identifier, and register the location identifier of the terminal with the terminal home ILR; After being released, the resources allocated to the terminal are released; and the data packets of the cut-in and the cut-out terminal are forwarded;
  • the ILR is configured to: register a location identifier of the update terminal, and send a location identifier update notification to the gateway accessed by all communication peers of the terminal after receiving the trigger of the update communication peer.
  • the AGW includes:
  • the control module is configured to: send an AGW handover request to the target AGW, and release the resource allocated for the terminal after the handover is completed;
  • the cut-in control module is configured to: after receiving the AGW switching request, send an allocation notification to the location identifier allocation module, carry the handover terminal identity identifier, and then send a registration notification to the location identifier registration module, and return an AGW handover response to the source AGW. ;
  • a location identifier allocation module configured to: after receiving the distribution notification, assign the terminal a new location identifier to the local AGW, and save mapping information of the terminal identity identifier and the new location identifier; the location identifier registration module, and the setting After: receiving the registration notification, initiating the location identification registration process, sending a location identification registration request to the terminal home identity register (ILR), and updating the location identifier of the terminal saved by the terminal ILR;
  • ILR terminal home identity register
  • the connection information maintenance module is configured to: report and update the terminal to the terminal to the ILR.
  • the first packet forwarding module is configured to: perform location identification encapsulation, de-address encapsulation, and forwarding of 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 parsing the connection information between the terminal and the communication peer end from the received data packet of the terminal, and notifying the connection information maintenance module for maintenance;
  • the ILR includes:
  • a registration processing module configured to: after receiving the location identifier registration request sent by the AGW, register the correspondence information of the identity identifier and the location identifier of the update terminal;
  • the location identifier update module is configured to: initiate a location identifier update process according to the received update communication peer trigger message, and send a location identifier update notification to the gateway accessed by all communication peers of the terminal after receiving the trigger of the update communication peer end, Carry the identity of the terminal and the new location identifier.
  • the connection service network further includes an identity location core router (ILCR), and each ILCR has a data interface with the generalized forwarding plane.
  • the generalized forwarding plane supports routing of data packets with the location identifier as the source address and the destination address.
  • the forwarding; the ILCR includes a second packet forwarding module, configured to: route and forward the data packet with the location identifier as the source address and the destination address; the AGW further includes a first tunnel establishment module;
  • the cut-in control module is further configured to: select a target ILCR after receiving the AGW switch request, and send a tunnel establishment notification to the tunnel establishment module;
  • the first tunnel establishment module is configured to: after receiving the tunnel establishment notification, establish a tunnel entry notification a dynamic tunnel with the target ILCR; or
  • the AGW further includes a first tunnel establishment module, where the first tunnel establishment module is configured to: establish a static tunnel with the ILCR after powering on.
  • the AGW and the generalized forwarding plane have a data interface, and the generalized forwarding plane supports routing and forwarding of the data with the location identifier as the source address and the destination address.
  • the connection information maintenance module updates the connection information of the terminal and the communication peer to the terminal in real time to the ILR; the location identification update module that triggers the ILR initiates the update of the location identification update process, and the communication end trigger message refers to the AGW transmission.
  • the location identifies the registration request.
  • the connection information maintenance module is configured to report the ILR to the terminal at a timed or quantitative basis. Updating the connection information of the terminal and the communication peer;
  • the cut-out control module is further configured to: after receiving the handover response sent by the destination AGW, send a communication peer information transmission request to the terminal home ILR, where the maintenance information module that carries the connection information has not been updated to the terminal belonging to the terminal ILR and Communicating the connection information of the peer end, and notifying the connection information maintenance module to stop the maintenance of the connection information of the cut-out terminal;
  • the location identifier registration request sent by the location identifier registration module carries the connection information of the terminal and the communication peer end that the connection information maintenance module has not updated to the terminal home ILR;
  • the update communication peer trigger message refers to a request after the communication peer information transfer request and the location identifier registration request.
  • the AGW further includes a mapping information maintenance module, configured to: report, update, and update the identity-location identification mapping information of the communication peer end of the terminal to the terminal home ILR, and maintain the communication of the terminal that is not updated to the terminal home ILR.
  • the identity-location identification mapping information of the peer end; and the identity-location identification mapping information of the communication peer end is obtained by:
  • the location identifier update module of the ILR is configured to: when initiating the location identifier update process, determine, according to mapping information, local configuration information, or DNS query of the communication peer identity identifier-location identifier, the communication peer access The gateway sends a location identifier update notification to the gateway accessed by the communication peer end, and carries mapping information of the terminal identity identifier and the new location identifier.
  • the first packet forwarding module in the AGW is configured to: after receiving the downlink data packet sent to the cut-out terminal, forwarding the packet to the target AGW through the forwarding tunnel with the target AGW, and receiving and sending the packet When the downlink data packet of the terminal is cut, it is sent to the terminal through the data channel of the terminal.
  • the ILCR further includes a second tunnel establishing 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 releasing the forwarding tunnel after the handover is completed;
  • the second packet forwarding module in the ILCR is configured to: forward the received data packet sent to the cut-out terminal to the source AGW first, at the source and destination ILCR. After the forwarding tunnel is established, the forwarding tunnel is forwarded to the target ILCR. The received data packet sent to the ingress terminal is forwarded to the target AGW through the tunnel with the target AGW.
  • the cutting 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, the identifier information of the source ILCR is Sending to the target ILCR; the second tunnel establishment module of 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 second 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 further configured to: when sending a handover request to the target AGW, send a first notification to the packet forwarding module in the AGW;
  • the hand-in control module is further configured to: when receiving the handover request from the source AGW, send a second notification to the packet forwarding module in the AGW;
  • the first packet forwarding module in the AGW is configured to: before receiving the first notification, perform the location identification encapsulation on the received downlink data packet of the cut-out terminal, and then forward the packet to the target AGW. After the first notification, the device 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, after receiving the second notification. And performing the solution of the location identifier and then sending the packet to the terminal; the downlink data packet of the hand-in terminal forwarded by the target ILCR is decapsulated and encapsulated, and then sent to the terminal through the data channel of the terminal.
  • the first packet forwarding module of the AGW forwards the received uplink data packet of the cut-out terminal to the source ILCR, and performs location identification encapsulation on the uplink data packet before receiving the first notification.
  • An uplink data message sent to the received hand-in terminal such as a tunnel with the target ILCR
  • the uplink data packet is forwarded to the source AGW, and after receiving the second notification, the uplink data packet is further encapsulated by the location identifier, for example, a tunnel with the target ILCR is established, and the uplink datagram is After the location identification is encapsulated, it is forwarded to the target ILCR through a tunnel with the target ILCR or forwarded to the source AGW through a tunnel with the source AGW.
  • the AGW has a data interface to the generalized forwarding plane.
  • the packet forwarding module in the AGW is configured to: perform the location identifier encapsulation of the received uplink data packet and forward the packet to the generalized forwarding plane; Before receiving the second notification, the uplink data packet sent by the received terminal is directly forwarded to the source AGW, and after receiving the second notification, the uplink data packet is encapsulated and then forwarded. To the generalized forwarding plane.
  • the hand-in control module is configured to select a target ILCR in the following manner:
  • the hand-in control module interacts with the AAA server to which the terminal is located to obtain the ILCR information that the target AGW can connect, and selects an ILCR as the target ILCR; or the hand-in control module allows the access terminal from the source AGW to allow access. Selecting an ILCR as the target ILCR in the ILCR, the ILCR allowing access is sent to the source AGW by the AAA server to which the handover terminal belongs; or
  • the hand-in control module selects a target ILCR according to configuration information of the AGW.
  • the AGW handover request sent by the cut-out control module to the target AGW is an anchor data channel function (DPF) handover request; and the AGW handover response sent by the handover control module to the source AGW is an anchor DPF handover response.
  • DPF anchor data channel function
  • the method for switching the fixed anchor point of the Wimax system of the present invention and the mobile communication network for separating the identity and location of the Wimax system are applied to the WiMAX network, and when the terminal moves, the terminal is received by the terminal home identity register (ILR).
  • the gateway AGW, ILCR or other gateways such as the border gateway
  • the communication peer access is notified to update the terminal AID-RID mapping information, thereby realizing the switch without fixed anchor point, and reducing the data packet.
  • the path is bypassed, which reduces transmission delay and bandwidth waste, and can also achieve the purpose of solving the dual identity of the IP address.
  • Figure 1 is a schematic diagram of a network topology based on identity and location separation architecture.
  • Figure 2 is a schematic diagram of the topology relationship between a network based on identity and location separation architecture and a Legecy IP network (traditional IP network).
  • Figure 3 is a schematic diagram of an existing WiMAX network architecture.
  • Figure 4a is a schematic diagram of the identity and location separation WiMAX network architecture.
  • Figure 4b is a schematic diagram of the identity and location separation WiMAX network architecture.
  • FIG. 5 is a flowchart of Embodiment 1 of a handover method for implementing anchorless anchor point switching according to the present invention.
  • 6 is a flow chart of Embodiment 2 of a handover method for implementing unfixed anchor point switching according to the present invention.
  • FIG. 7 is a flowchart of Embodiment 3 of a handover method for implementing anchorless anchor point switching according to the present invention.
  • FIG. 8 is a flowchart of Embodiment 4 of a handover method for implementing unfixed anchor point switching according to the present invention.
  • FIG. 9 is a flowchart of Embodiment 5 of a handover method for implementing anchorless anchor point switching according to the present invention.
  • FIG. 10 is a flowchart of Embodiment 6 of a handover method for implementing anchorless anchor point switching according to the present invention.
  • FIG. 11 is a flowchart of Embodiment 7 of a handover method for implementing anchorless anchor point switching according to the present invention.
  • FIG. 12 is a flowchart of Embodiment 8 of a handover method for implementing a fixed anchor point handover according to the present invention.
  • FIG. 13 is a flow chart of Embodiment 9 of the present invention for implementing a handover method without fixed anchor point switching.
  • FIG. 14 is a flowchart of Embodiment 10 of a handover method for implementing unfixed anchor point switching according to the present invention.
  • FIG. 15 is a flowchart of Embodiment 11 of the method for implementing handover without fixed anchor point according to the present invention.
  • Figure 16 is a flow chart of reporting and updating communication peer information to the ILR by the AGW or ILCR of the present invention. Preferred embodiment of the invention
  • the non-fixed anchor point switching method of the Wimax system of the present invention and the main idea of the Wimax system are: applying a mobile communication network with identity identification and location separation to the WiMAX network, and when the terminal performs mobile handover, the terminal home identity location register (ILR) After receiving the trigger message of the update communication peer, notify the communication peer to access the gateway (AGW, ILCR or other gateways such as the border network) Off) Update the terminal AID-RID mapping information, thereby achieving no fixed anchor point switching, reducing the path detour of the data packet, reducing the transmission delay and bandwidth waste, and also achieving the purpose of solving the dual identity of the IP address.
  • ILR terminal home identity location register
  • FIG 2 shows an architecture of the Subscriber Identifier & Locator Separation Network (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. It is located at the edge of the backbone network and is responsible for accessing all terminals.
  • the backbone network is responsible for routing and forwarding data packets between terminals.
  • the AID is the user identity of the terminal, and the network assigns an AID to each terminal user, which remains unchanged during the terminal movement; the RID is 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, but the essence is the same.
  • the user subscribes to become the network user of the architecture, the user can perform the account opening operation in the home authentication center and the home ILR.
  • the authentication center and the ILR record the attribute data of the user, including the AID assigned to the user.
  • the AID is statically assigned to the user, and the user's AID remains unchanged during the effective legal existence of the user.
  • 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.
  • 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.
  • Layer 2 access methods include: Cellular mobile network technology (GSM/CDMA/TD-SCDMA/WCDMA/Wimax/LTE), DSL, broadband fiber access or WiFi access, and more.
  • the access service node is used to provide access services for the terminal, maintain the connection between the terminal and the network, assign the RID to the terminal, maintain the AID-RID mapping information, register and register the RID of the terminal, and implement the RID of the terminal. Functions such as routing and forwarding of data packets.
  • the main network elements of the backbone network include:
  • the 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 data. For the routing and forwarding of packets, the terminal must access the backbone network through the ASN.
  • the RID assigned by the ASN contains the address information of the ASN. 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.
  • the ILR Identity Location Register
  • the ILR is used to store the identity and location identifier mapping information of the terminal, and is also written as AID-RID mapping information, and handles registration, cancellation, and query of the terminal location;
  • the backbone network may further include:
  • the PTF Packet Transfer Function
  • the packet forwarding function node is used to route and forward data packets with the AID as the destination address.
  • An Interworking Service Node has interfaces with general-purpose routers, ASNs, and ILRs for querying and maintaining AID-RID mapping information of the network terminal, encapsulating, routing, and forwarding data between the network and the traditional IP network. ⁇ , to achieve the interconnection of 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.
  • Other network elements such as a certification center may also be included in the backbone network.
  • the SILSN architecture can exist and evolve in the form of one or more islands of a traditional IP network, or as an extension of a traditional IP network.
  • the topology relationship between the SILSN architecture and the traditional IP network is shown in Figure 3.
  • the backbone part of the SILSN architecture is in the same plane as the traditional IP, and communicates with the traditional IP network through the ISN.
  • the SILSN architecture has the capability of independent networking, which can form a network that is developed independently from the traditional IP network. At this stage, the functional entity ISN will no longer exist.
  • the present invention applies the above SILSN architecture to a WiMAX system to achieve unfixed anchor point switching.
  • 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.
  • the RID update is required to be sent to the gateway accessed by the communication peer. Know.
  • the source ASN needs to forward the packet sent by the communication peer to the terminal to the target ASN.
  • the network element that accesses the communication peer end of the terminal is simply referred to as the peer network element.
  • 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 user terminal that communicates with the user terminal of the network element is called a communication peer.
  • the source anchor access gateways in the original handover procedure are collectively referred to as source access gateways, and the target anchor access gateways are collectively referred to as target access gateways.
  • Figures 4a and 4b show the system after the above identity and location separation techniques are applied to a WiMAX network.
  • the user terminal that accesses the network element is called a terminal
  • the communication with the user terminal that accesses the network element is called a communication peer.
  • the communication peer information includes one or more of the following: connection information between the terminal and the communication peer (i.e., mapping of the terminal AID to the communication peer AID), and communication peer AID-RID mapping information.
  • Fig. 4a is a schematic diagram of a network architecture of a Wimax system applying the above-described identity and location separation techniques, in which the solid line indicates the connection of the bearing surface and the broken line indicates the connection of the control surface.
  • the Wimax network architecture includes an Access Service Network (W-ASN) and a Connected Service Network (W-CSN).
  • the connection 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.
  • 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 authentication and authorization accounting
  • PTF packet forwarding function
  • ILR/PTF packet forwarding function
  • ILR/PTF ILR/PTF
  • ILR/PTF ILR/PTF
  • 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.
  • the access gateway 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 the maintenance is not updated.
  • W-ASN WiMAX access service network
  • the connection information between the terminal of the ILR and the communication peer, the maintenance terminal and the communication terminal AID-RID mapping information, the terminal belonging to the ILR, the communication peer information, the RID encapsulation and decapsulation of the data packet, and the RID according to the RID Implement routing and forwarding of data packets.
  • 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 address and the destination address. This function is similar to the router in the prior art;
  • the ILR located in the W-CSN, is configured to receive a registration and deregistration request of the AGW for the ILR home subscriber terminal, maintain AID-RID mapping information of the home subscriber terminal, and receive a query request for the terminal RID, where the terminal is requested.
  • the RID corresponding to the AID is returned to the query requesting party, and after receiving the trigger message of the updated communication peer, the RID update notification is sent to the gateway accessed by all the communication peers of the terminal.
  • the AGW 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, and register the RID of the terminal with the terminal home ILR; After being cut out, the resources allocated to the terminal are released; and the data packets cut into and out of the terminal are forwarded;
  • RID new location identifier
  • the ILR located in the W-CSN, is used to register, log out, query the RID of the terminal, and send a RID update notification to the gateway of all communication peers of the terminal after receiving the trigger message of the updated communication peer.
  • the AGW includes:
  • the cut-out control module is configured to send an AGW handover request to the target AGW, and release the resource allocated for the terminal after the handover is completed;
  • 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 return an AGW handover response to the source AGW;
  • the method further includes: selecting a target ILCR after receiving the AGW switching request, and sending a tunnel establishment notification to the tunnel establishment module;
  • the AGW handover request sent by the cut-out control module to the target AGW is an anchor data channel function (DPF) handover request; and the AGW handover response sent by the handover control module to the source AGW is an anchor DPF handover response.
  • DPF anchor data channel function
  • 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, send a RID registration request to the terminal home identity register (ILR), and update the RID of the terminal saved by the terminal to the ILR;
  • ILR terminal home identity register
  • the connection information maintenance module is configured to report, update, and update connection information between the terminal and the communication peer end to the home ILR, and maintain connection information between the terminal and the communication peer that are not updated to the terminal home ILR, where the connection information between the terminal and the communication peer includes the Correspondence relationship information between the terminal AID and all communication peer AIDs;
  • 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 is also used to receive the received data.
  • the connection information between the terminal and the communication peer is parsed in the data packet of the terminal, and the connection information maintenance module is notified for maintenance;
  • the data packet of the terminal in the present invention includes a downlink data packet sent to the terminal and an uplink data packet sent by the terminal.
  • a tunnel establishment module configured to establish a dynamic tunnel with the target ILCR for the handover terminal after receiving the tunnel establishment notification
  • the ILR includes: a registration processing module, configured to: after receiving the RID registration request sent by the AGW, register the correspondence information of the AID and the RID of the updated terminal;
  • the RID update module is configured to initiate a RID update process according to the received update communication peer trigger message, and send 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, specifically,
  • the gateway accessing the communication peer is determined according to the mapping information of the communication peer AID-RID, the local configuration information, or the DNS query, and the RID update notification is sent to the gateway accessed by the communication peer. Carrying mapping information of the terminal AID and the new RID.
  • 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 connection information maintenance module updates the connection information of the terminal and the communication peer to the terminal in real time to the ILR.
  • the RID update module that triggers the ILR initiates the update of the RID update process.
  • the communication peer trigger message refers to the RID registration request sent by the AGW. .
  • the connection information maintenance module periodically reports or updates the connection information of the terminal and the communication peer to the terminal home ILR;
  • the cut-out control module is further configured to send a communication peer information transmission request to the terminal home ILR after receiving the handover response sent by the destination AGW, where the terminal and the communication pair that the connection information maintenance module has not updated to the terminal belonging to the ILR The connection information of the terminal, and notifying the connection information maintenance module to stop the maintenance of the connection information of the cut-out terminal;
  • the RID registration request sent by the RID registration module carries the connection information that the connection information maintenance module has not updated to the terminal that belongs to the terminal ILR and the communication peer;
  • the RID update module that triggers the ILR initiates an update communication peer trigger message of the RID update process, and refers to the subsequent communication peer information transfer request or RID registration request.
  • the AGW further includes a mapping information maintenance module, configured to report, update, and update the AID-RID mapping information of the communication peer end of the terminal to the terminal home ILR, and maintain the update to the terminal belonging ILR.
  • the AID-RID mapping information of the communication peer of the terminal is not limited to, but not limited to, but not limited to, but not limited to, but not limited to, but not limited to, but not limited to, but not limited to, but not limited to report, update, and update the AID-RID mapping information of the communication peer end of the terminal to the terminal home ILR, and maintain the update to the terminal belonging ILR.
  • the AID-RID mapping information of the communication peer of the terminal is configured to report, update, and update the AID-RID mapping information of the communication peer end of the terminal to the terminal home ILR, and maintain the update to the terminal belonging ILR.
  • the mapping information maintenance module of the AGW obtains the AID-RID mapping information of the communication peer end by:
  • the AID-RID mapping information of the communication peer is locally queried according to the AID of the communication peer in the data message;
  • the AID-RID mapping information of the communication peer is queried from the communication peer to the ILR; or the AID-RID mapping information of the communication peer is obtained by querying from the source AGW or the source ILCR.
  • the packet forwarding module in the AGW After receiving the downlink data packet sent to the cut-out terminal, the packet forwarding module in the AGW forwards the downlink data packet to the target AGW through the forwarding tunnel with the target AGW, and receives the downlink data packet sent to the cut-in terminal. , is sent to the terminal through a data channel with 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 forwards the received data packet sent to the cut-out terminal to the source AGW first, and then forwards the forwarding tunnel between the source and the target ILCR through the forwarding tunnel.
  • the received data message 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, and the cut-in control module is further configured to: when the selected target ILCR is different from the source ILCR, the source is The identifier information of the ILCR is sent to the target ILCR.
  • the tunnel establishment module in the ILCR is configured to establish a forwarding tunnel to the source ILCR according to the received identifier information of the source ILCR. 2.
  • the corresponding access control module (corresponding to the third embodiment) Also used to identify the target ILCR Sending the information 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 in the ILCR is used according to The identification information of the received target ILCR is established to the forwarding tunnel of the target ILCR.
  • the cut-out control module When the cut-out control module sends a handover request to the target AGW, the first control is sent to the packet forwarding module in the local AGW;
  • the handover control module When the handover control module receives the handover request from the source AGW, the handover control module sends a second notification to the packet forwarding module in the local 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.
  • 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.
  • 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 packet 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 terminal is forwarded, and 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 further encapsulated by RID, such as A tunnel with the target ILCR is established, and the uplink data packet is RID encapsulated and then forwarded to the target ILCR through a tunnel with the target ILCR or forwarded to the source AGW through a tunnel with the source AGW.
  • the manner in which the hand-in control module selects the target ILCR is one of the following modes:
  • 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 2 The ILCR that the hand-in control module sends from the source AGW to the access terminal allows access Selecting an ILCR as the target ILCR, and the ILCR that is allowed to access is sent to the source AGW by the AAA server to which the handover terminal belongs;
  • Manner 3 The hand-in control module selects a target ILCR according to the configuration information of the AGW.
  • FIG. 5 is a first flowchart of the system in which the terminal does not have a fixed anchor point switch, and the data forwarding process is performed by using the forwarding tunnel between the AGWs in the handover process.
  • the specific steps are as follows: Step 501: When in the connected state After the terminal moves and completes the W-ASN anchoring handover, 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 mentioned in the process refers to the terminal in which the handover occurs, and other embodiments are the same.
  • the terminal can complete the W-ASN anchor switching according to existing standards. After the data channel is established between the source AGW and the target AGW, the uplink and downlink data packet paths of the terminal are as shown in D501 and D502.
  • the source ILCR After receiving the data packet sent by the communication peer to the terminal, the source ILCR forwards the data packet to the source AGW.
  • 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 access gateway sends the packet to the terminal through the terminal data channel.
  • 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.
  • the target AGW forwards the data packet to the source AGW through the data channel between the source AGW and the target AGW, and the source AGW performs the RID on the data packet.
  • the encapsulation and forwarding are forwarded to the generalized forwarding plane via the source ILCR and/or the mapping forwarding plane, and then sent to the peer access gateway through the generalized forwarding plane, such as AGW, ILCR, or other gateways such as border gateways.
  • a network element performs RID encapsulation and forwarding on data packets and ASN logarithm in the background art.
  • the RID encapsulation and forwarding are similar.
  • the network element searches for the RID of the communication peer from the locally cached AID-RID mapping information according to the AID of the communication peer, such as finding the terminal and the communication peer.
  • the RID is encapsulated in the data packet as the source and destination addresses, and is forwarded directly to 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.
  • the network element If the network element is the AGW, the network element encapsulates the RID of the terminal as a source address in the data packet, forwards it to the mapping forwarding plane, or forwards it to the mapping forwarding plane through the source ILCR, and queries the ILR. RID to the communication peer and cache.
  • RID of the communication peer When the RID of the communication peer is not found, another RID encapsulation and forwarding mode can be used: first, the data message is cached locally, and then the IRR is queried to the RID of the communication peer and cached, and then the terminal and the terminal are The RID of the communication peer is encapsulated in the data packet as the source and destination addresses, and is directly forwarded 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.
  • 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.
  • the source AGW maintains the connection information between the terminal and the communication peer.
  • the connection information may be updated according to the flow real-time detection mechanism (for example, deleting the AID of the communication peer determined to be offline), and the data packet may be checked. Add the AID and RID of the new communication peer in the data message to the connection information, and save the RID of the communication peer that is queried to the ILR.
  • the source AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • Step 502 When the target AGW is ready to initiate the AGW relocation, send an anchor DPF switch trigger message to the source AGW, where the step is optional.
  • Step 503 The source AGW sends an anchor DPF handover request to the target AGW.
  • 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 may also be that the source AGW decides to send an anchor DPF handover request when initiating anchor AGW relocation.
  • the path of the uplink and downlink data packets of the terminal is still as shown in D501 and D502. Only the target AGW encapsulates and decapsulates the data packets at this time.
  • the target AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information. There may be that the same communication peer, the source AGW has updated the ILR, and the target AGW updates the ILR again. At this time, the ILR overwrites the original data or does not process. In other embodiments of the system, the same processing is performed. It will not be detailed later.
  • Step 504 The target AGW allocates a new RID to the terminal, and locally saves and updates the terminal AID-RID mapping information.
  • 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.
  • 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.
  • 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. After 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 target access gateway passes the packet with the terminal data. The channel is sent to the terminal.
  • 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 performs RID encapsulation and forwarding on the data packet, and is forwarded by the target ILCR and/or the mapping forwarding plane.
  • the target ILCR and/or the mapping forwarding plane performs RID encapsulation and forwarding on the data packet, and is forwarded by the target ILCR and/or the mapping forwarding plane.
  • To the generalized forwarding plane and then sent to the peer access gateway through the generalized forwarding plane.
  • the target AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • Step 506 After assigning a new RID, the target AGW 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.
  • the unreported information is carried in the message to report the terminal belonging to the ILR, and the ILR saves the information of the received communication peer.
  • the communication partner AID-RID mapping information is saved in the ILR, and the target AGW includes the connection information of the terminal and the communication peer in the communication peer information of the terminal belonging to the ILR in this step, and the communication peer AID-RID mapping information Otherwise, you only need to report the connection information between the terminal and the communication peer.
  • Step 507 After receiving the RID registration request of the target AGW, the home ILR verifies the legality of the AID, and saves the mapping information of the current AID-RID of the terminal.
  • the AAA server may be associated with the ILR, denoted AAA/ILR.
  • 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.
  • the terminal uplink and downlink data path is as shown in D505 and D506:
  • downlink data packet path the target ILCR receives the data packet sent by the communication peer to the terminal. After being forwarded to the target AGW, 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 target AGW sends the packet to the terminal through the terminal data channel. .
  • the target AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • Step 508 The target AGW sends an anchor DPF handover response to the source AGW, and completes the AGW handover.
  • Step 509 The source AGW sends a communication peer end information transmission request to the terminal home ILR; if the locally stored communication peer information still has no information about the terminal belonging to the ILR, the unreported information is carried in the message reporting terminal. Attributable to the ILR, the ILR holds the information of the received communication peer. If the terminal AID-RID mapping information is stored in the terminal belonging to the ILR, the source AGW is in the communication peer information of the terminal belonging to the ILR in this step. It includes the connection information between the terminal and the communication peer, and the communication peer AID-RID mapping information; otherwise, only the connection information of the terminal and the communication peer is required.
  • Step 510 The terminal home ILR sends an RID update notification to the gateway accessed by all the peers according to the RID of the communication peer end, carrying the AID of the terminal and the new RID;
  • Step 511 After the terminal home ILR completes the communication peer update, the terminal AGW responds to the communication peer end information delivery response message, and notifies the source AGWAGW that the communication peer end update is completed.
  • the terminal home ILR may also perform step 511 immediately after step 509 without waiting for the completion of step 510.
  • the meaning of step 511 is that the ILR confirms receipt of the source AGW message.
  • the source AGW may be sent an update communication peer completion message.
  • Step 512 The source AGW or the target AGW releases the data channel between the two, and the source AGW releases the saved user context, the connection information of the terminal and the communication peer that may exist, and the AID-RID mapping information of all communication peers of the terminal. For each communication peer of the terminal, 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 of the communication peer is retained. RID mapping information.
  • This step may be started after step 508, or may be started after receiving the notification that the ILR completes updating the communication peer (such as step 511). In order to better ensure the continuity of the data, it may also be triggered by a timer, as in the step.
  • the timer is set after 508 or step 511, and the tunnel is released after the timer expires.
  • Step 513 The source AGW releases the tunnel with the source ILCR.
  • Step 514 The target AGW initiates a context reporting process to the target base station, and sends a new AGW to the target base station. This step can be performed after step 508.
  • the uplink data packet is forwarded from the tunnel, such as D504 and D506.
  • 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.
  • the source AGW triggers the ILR to update the communication peer process in step 509.
  • step 509 may also be performed in advance to step 503.
  • the terminal home ILR receives the source AGW. After the communication peer information is transmitted, the update process of the communication peer is not started, and the RID is registered after being received.
  • Mode 1 The target AGW interacts with the AAA server to which the terminal belongs, obtains the information of the ILCR that the target AGW can connect, and selects an ILCR as the target ILCR. If you can choose according to local policy or terminal indication, refer to the way AGW selects HA. In the case of roaming, the interaction needs to be forwarded by visiting the AAA server, and the visited AAA server can notify the target AGW of the ILCR information that the target AGW is connected in the forwarding process.
  • Manner 2 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 according to the configuration, 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 AGCR connectable ILCR, network topology).
  • the communication peer information of the present invention includes at least the connection information between the terminal and the communication peer, and may further include mapping information of the communication peer, wherein the connection information between the terminal and the communication peer includes the correspondence relationship between the terminal AID and all communication peer AIDs.
  • the correspondence information is obtained by the maintenance communication peer information network element (AGW or ILCR) from the received uplink or downlink data packet of the terminal.
  • the target side network element (such as the target AGW and the target ILCR) that maintains the communication peer information can obtain the mapping information of the communication peer end by the following manner.
  • the target side network element locally queries the AID-RID mapping information of the communication peer end according to the AID of the communication peer end in the data packet, wherein other terminals that are connected by the target side network element and are communicating with the communication peer end may be locally The AID-RID mapping information of the communication peer has been saved; or
  • the target side network element does not find the AID-RID mapping information of the communication peer locally, the ALR-RID mapping information of the communication peer end is queried from the communication peer home ILR and stored locally; or
  • the AID-RID mapping information of the communication peer end is obtained from the source side network element query and saved locally.
  • the AGW source AGW or target AGW responsible for maintaining the communication peer information in the handover process of the system 1 reports and updates the communication peer information to the ILR as follows:
  • Step 1601 After the terminal accesses the AGW, establish communication with the communication peer. Thereafter, the data path of the terminal is displayed as shown in D1601 and D1602.
  • the downlink data packet path After receiving the data packet sent by the communication peer to the terminal, the ILCR on the same side forwards the data packet to the AGW. The AGW strips the RID encapsulated in the data packet and restores the data sent by the communication peer. After the format of the message, it is sent to the terminal through the terminal data channel.
  • the uplink data packet path The terminal sends the uplink data message to the base station, and the base station forwards the data packet to the AGW, and then forwards it to the generalized forwarding plane via the ipsilateral ILCR and/or the mapping forwarding plane, and then sends the pair to the generalized forwarding plane.
  • the gateway that is connected to the end. Steps 1602 and 1603, the AGW serving the terminal discovers a new communication peer in the process of transmitting and receiving data, for example, according to the real-time flow detection mechanism, and saves the connection information between the terminal and the communication peer (ie, the AID mapping information of the terminal and the communication peer) And AID-RID mapping information of the communication peer;
  • Step 1604 The AGW sends a communication peer information notification request message to the terminal home ILR, and carries the connection information between the terminal and the communication peer end, and can also carry the AID-RID mapping information of the communication peer end;
  • the AGW can report the information of the communication peer to the terminal's home ILR in real time according to the established policy, that is, notify the user when there is a change; or, the AGW can report the information of the communication peer to the home ILR in batches, for example, at intervals or when When the number of communication peers reaches a predetermined number, the information of the communication peer is reported to the home ILR.
  • Step 1605 The home ILR saves the received connection information and/or AID-RID mapping information between the terminal and the communication peer;
  • Step 1606 The home ILR returns a response to the AGW.
  • the AGW may select to continue to retain or delete the information of the reported communication peer in the communication peer table of the terminal according to the setting policy. If the established policy is to use real-time reporting, the AGW does not need to save the communication peer table, which greatly solves the problem that the communication peer table in the AGW is too large and occupies memory and processing performance.
  • the AGW updates the locally saved communication peer AID-RID mapping information after receiving the notification of the communication peer home ILR.
  • the communication peer AID-RID mapping information is reported to the home ILR, and the terminal needs to notify the home ILR to update the AID-RID mapping information of the communication peer.
  • the access gateway informs the terminal's home ILR to delete the mapping information of the relevant communication peer.
  • the method for the terminal to belong to the ILR to update the communication peer is:
  • the terminal home identity register starts the process of updating the communication peer after receiving the trigger message of updating the communication peer, and finds all the communication peers of the terminal that need to be updated according to the terminal and the communication peer connection information;
  • AGW or ILCR uses the real-time mode to belong to the terminal to the 4th communication peer information on the ILR, Updating the trigger message of the communication peer to the RID registration request message sent by the target AGW or the target ILCR;
  • the terminal home ILR may not need the source anchor access gateway or the source ILCR trigger, that is, The source AGW or the source ILCR does not need to send a communication peer information transfer request to trigger the terminal home ILR to update the communication peer end.
  • the terminal home ILR directly starts the update after receiving the RID registration of the target anchor access gateway or the target ILCR. Communication peer process.
  • the trigger message of the communication peer is updated to the subsequent communication peer information transmission request or RID registration request; all implementations of the present invention
  • the AGW or the ILCR is used in a non-real time manner, for example, at intervals, or when the number of communication peers reaches a predetermined number, the information of the communication peer is reported to the home ILR.
  • the target AGW or the target ILCR needs to simultaneously report the local saved communication peer information to the terminal home ILR when performing RID registration.
  • the terminal home ILR receives the communication peer information transmission request sent by the source AGW or the source ILCR or receives the RID registration request sent by the target AGW or the target ILCR, the terminal initiates the communication peer update process.
  • an update completion message may be sent to the target AGW or the target ILCR, and the target AGW or the target ILCR may set the timer to wait for release forwarding at this time. tunnel.
  • the terminal belonging to the ILR can update only the communication peer obtained before the terminal RID registration process, and the new communication peer obtained after the RID registration process does not need to be updated. Or simply handle it as updating all communication peers.
  • mapping information of the communication peer AID-RID determines the gateway accessed by the communication peer according to the communication AID-RID mapping information of the communication peer (for example, according to configuration query, or DNS query, etc.); if there is no communication peer
  • the AID-RID mapping information may be determined according to the local configuration information (such as configuring the correspondence between the communication peer AID and the access gateway in the ILR) or the DNS query, etc., to determine the gateway accessed by the communication peer, to the communication peer
  • the accessed gateway sends a RID update notification to carry the terminal. Mapping information of AID and new RID;
  • the gateway accessed by the communication peer After receiving the update notification, the gateway accessed by the communication peer end updates the locally cached terminal AID-RID mapping information, and after completing the update, returns a response message to the terminal home ILR;
  • the gateway or terminal home ILR accessing the communication peer needs to notify the communication peer to update the terminal AID-RID mapping information.
  • the terminal belongs to the AGW after the ILR completes the communication peer update and returns a success message to the terminal.
  • the terminal's communication peer connection information and the communication peer AID-RID mapping information may be updated, such as receiving the notification of updating the communication peer mapping information, adding a new communication pair. Wait.
  • the gateway accessed by the terminal shall report the communication peer update information to the terminal home ILR.
  • the home ILR updates the saved mapping information of the communication peer, and if the notification that the terminal mapping information has been updated is sent to the gateway originally accessed by the communication peer, the communication peer needs to be redirected to the communication peer again.
  • the newly accessed gateway sends a notification to update the terminal mapping information.
  • 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 is established. The specific steps are as follows:
  • the source AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • Step 603 After the source AGW receives the target access gateway anchor DPF handover trigger message, or the source AGW decides to initiate the AGW relocation, the source AGW sends an anchor DPF handover request message to the target AGW, where the message needs to carry the identifier of the source ILCR.
  • the identification information may be an address or a dedicated identifier.
  • Step 604 the same step 504;
  • Step 605 the target AGW selects the target ILCR, initiates a tunnel establishment process to the target ILCR, and notifies the source ILCR identification information to the target ILCR;
  • the target ILCR may need to interact with the home AAA server to complete the authentication.
  • the tunnel between the access gateway and the ILCR may be in various manners, such as L2TPv3, IP-in-IP, MPLS (LDP-based and RSVP-TE based), GRE, MIP, IPsec, etc., and the present invention is not limited to any A specific way of tunneling.
  • MIP Mobility Management Entity
  • the tunnel is created and maintained in the same way as an existing WiMAX network.
  • Step 606 The target ILCR initiates a process of establishing a forwarding tunnel to the source ILCR according to the identifier information of the source ILCR obtained in step 605.
  • the target ILCR is the same as the source ILCR, do not perform this step.
  • the tunnel between the ILCRs may be in various manners, such as L2TPv3, IP-in-IP, MPLS (LDP-based and RSVP-TE based), GRE, MIP, IPsec, etc., and the present invention is not limited to any specific one. Tunnel mode. Thereafter, the terminal uplink and downlink data is as shown in D603 and D604.
  • 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.
  • the target AGW strips the RID encapsulated in the data packet and restores the packet to the communication peer.
  • the target access gateway After the format of the data packet, the target access gateway sends the packet to the terminal through the terminal data channel.
  • the target AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • step 606 may be completed before the step 605, and the downlink data message needs to be in the target ILCR. Cache first, wait until step 605 is completed Issued to the target AGW.
  • the upstream data packet path is the same as D602, but the target AGW encapsulates and decapsulates the data packet.
  • the target AGW updates the communication peer information to the terminal to the ILR, and optionally maintains and updates the locally saved communication peer information.
  • the uplink and downlink data of the terminal is as shown in D605 and D606, D605 and D606, and D505 and D506.
  • the target AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • the downlink data packet path is the same as D603. .
  • Step 609 to step 614 the same step 508 to step 513;
  • Step 615 the source ILCR or the target ILCR initiates the release of the data forwarding tunnel between the two; if the target ILCR is different from the source ILCR, perform this step.
  • Step 616 the same step 514;
  • the uplink data packet is forwarded from the tunnel, such as D604 and D606.
  • the uplink data may 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.
  • the source AGW triggers the ILR to update the communication peer end process in step 610.
  • step 610 may also be advanced to step 603.
  • the terminal home ILR receives the source AGW. After the communication peer information is transmitted, the update process of the communication peer is not started, and the RID is registered after being received.
  • Figure 7 is applicable to the forwarding of data during the handover process using the forwarding tunnel between ILCRs, and by the source
  • the scenario in which the ILCR initiates the forwarding tunnel establishment between the ILCRs is as follows: Step 701, the same step 601;
  • the terminal uplink and downlink data is as shown in D701 and D702, D701 and D702, and D601 and D602.
  • the source AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • Step 702 When the target AGW is ready to initiate the AGW relocation, select the target ILCR, send an anchor DPF handover trigger message to the source AGW, and carry the target ILCR identification information in the message; where the identifier information may be an address or a special identifier. .
  • Step 703 After the source AGW receives the target AGW anchor DPF switch trigger message, and agrees to perform the anchor DPF switch, if it is determined according to the identifier information of the target ILCR, it is required to switch across the ILCR (if the source ILCR is different from the target ILCR) Sending an ILCR handover request to the source ILCR while carrying the target ILCR identification information; otherwise, steps 703 to 705 are not performed;
  • Step 704 The source ILCR initiates a process of establishing a forwarding tunnel to the target ILCR according to the identifier information of the target ILCR obtained in step 703.
  • the tunnel between the ILCRs may be in various manners, such as L2TPv3, IP-in-IP, MPLS (LDP-based and RSVP-TE based), GRE, MIP, IPsec, etc., and the present invention is not limited to any specific one. Tunnel mode.
  • Step 705 The source ILCR responds to the source AGW with an ILCR handover response.
  • the terminal uplink and downlink data path is as shown in D703 and D704:
  • 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. At this time, the downlink data packet needs to be cached on the target ILCR.
  • the target AGW encapsulates and decapsulates the data.
  • the target AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • D705 same as D603.
  • the downlink data packet buffered on the target ILCR in D703 also needs to be forwarded to the target AGW.
  • the target AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • Subsequent data message paths D707 and D708 are the same as D605 and D606.
  • step 703 to step 705 may be performed after step 708.
  • the uplink data packet is forwarded from the tunnel, such as D706 and D708.
  • the uplink data may 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.
  • the source AGW triggers the ILR to update the communication peer process in step 712.
  • step 712 may also be advanced to step 706.
  • the terminal home ILR receives the source AGW. After the communication peer information is transmitted, the update process of the communication peer is not started, and the RID is registered after being received.
  • the AGW change does not necessarily lead to the change of ILCR. Therefore, the source AGW needs to identify the information according to the target ILCR, or the target AGW needs to determine whether the ILCR changes according to the source ILCR identification information.
  • 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 a tunnel between the two.
  • the Wimax network architecture of the system using the above identity and location separation technology is still shown in Figure 4a, including the access service network (W-ASN) and the 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 and a generalized forwarding plane that supports routing and forwarding of data messages by RID.
  • ILCR Identity Location Core Router
  • Identity Location Core Router is used to assign RID to the terminal, register and deregister the terminal's RID to the ILR, query the ILR for the RID of the communication peer, maintain the terminal and communication peer AID-RID mapping information, and assign to the terminal.
  • the ILR reports and updates the AID-RID mapping information of the communication peer, performs RID encapsulation and decapsulation on the data packet, and implements routing and forwarding of data packets according to the RID.
  • the AGW or the ILCR maintains the connection information of the terminal and the communication peer that are not updated to the ILR, and adds the connection information of the terminal and the communication peer to the terminal home ILR, and registers and deletes the AID-RID mapping information to the ILR.
  • the ILR located in the W-CSN, is configured to receive a registration and deregistration request of the AGW for the ILR home subscriber terminal, maintain AID-RID mapping information of the home subscriber terminal, and receive a query request for the terminal RID, where the terminal is requested
  • the RID corresponding to the AID is returned to the query requester, and after receiving the trigger of the update communication peer, the RID update notification is sent to the gateway accessed by all communication peers of the terminal.
  • 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, release the terminal for the terminal. Resources; and forwarding and cutting out the data of the terminal "3 ⁇ 4 text forwarding processing;
  • the AGW is used to implement the WiMAX access service network (W-ASN) anchoring handover of the terminal, and selects a target ILCR for the handover terminal, and is also established when a tunnel for forwarding the terminal data packet is not established with the target ILCR.
  • the tunnel forwards data packets cut into the terminal through the tunnel.
  • W-ASN WiMAX access service network
  • the ILCR or the AGW is also used to register a new RID of the terminal to the home terminal ILR; the ILR is used to register, log out, query the RID of the terminal, and receive all the communication to the terminal after receiving the trigger message of updating the communication peer.
  • the peer access gateway sends an RID update notification.
  • the AGW includes:
  • Cutting out a control module configured to send an AGW switching request to the target AGW, after the handover is completed, Release the resources allocated for the cut out terminal;
  • the cut-in control module is configured to select a target ILCR after receiving the AGW switching request, notify the target ILCR that the target ILCR has a terminal cut-in and carries the AID of the cut-in terminal when the target ILCR is different from the source ILCR, and the cut-in is not established between the target ILCR and the target ILCR.
  • the tunnel is established when the tunnel data packet is forwarded, and is also used to send an AGW handover response to the source AGW.
  • the AGW switching request sent by the cut-out control module in the AGW to the target AGW is an anchor data channel function (DPF) switching request;
  • the AGW switching response sent by the hand-in control module in the AGW to the source AGW is an anchor DPF switch. response.
  • DPF anchor data channel function
  • the packet forwarding module is configured to forward and process data packets that are cut in and out of the terminal.
  • the ILCR includes:
  • 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;
  • the forwarding module is configured to forward data packets that are cut in and out of the terminal; the AGW or the ILCR further 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;
  • connection information maintenance module configured to report, update, and update connection information between the terminal and the communication peer to the terminal home ILR, and maintain connection information between the terminal not connected to the terminal home ILR and the communication peer end;
  • the AGW or the ILCR packet forwarding module is configured to parse the connection information between the terminal and the communication peer from the received data packet of the terminal, and notify the connection information maintenance module to perform maintenance;
  • the ILR includes:
  • Registration processing module for registering an update terminal after receiving a registration request from ILCR or AGW Correspondence information of AID and RID;
  • the RID update module is configured to initiate a RID update process according to the received update communication peer trigger message, and send 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, specifically,
  • the gateway that the communication peer accesses is determined according to the mapping information of the communication peer AID-RID, the local configuration information, or the DNS query, and the RID is sent to the gateway accessed by the communication peer.
  • the update notification carries the mapping information of the terminal AID and the new RID.
  • connection information maintenance module of the AGW or the ILCR reports and updates the connection information of the terminal and the communication peer to the terminal home ILR in real time; the RID update module that triggers the ILR initiates the update of the RID update process, and the communication peer trigger message refers to the RID registration sent by the AGW. request.
  • connection information maintenance module of the AGW or the ILCR reports or updates the connection information of the terminal and the communication peer end to the terminal home ILR periodically or quantitatively;
  • the cutting control module of the AGW or the ILCR is further configured to send a communication peer information transmission request to the terminal home ILR, where the connection maintenance module does not update the connection information between the terminal and the communication peer end of the terminal belonging to the ILR, and notifies The connection information maintenance module stops the maintenance of the connection information of the cut-out terminal;
  • the RID registration request sent by the RID registration module carries the connection information that the connection information maintenance module has not updated to the terminal that belongs to the terminal ILR and the communication peer;
  • the RID update module that triggers the ILR initiates an update communication peer trigger message of the RID update process, and refers to the subsequent communication peer information transfer request or RID registration request.
  • the ILCR cut-out control module sends a communication peer information transmission request to the terminal home ILR after receiving the switching notification of the source AGW or the destination ILCR, where the source AGW receives the destination AGW. Sending the handover notification to the source ILCR after the sent handover response; the destination ILCR sends the handover notification to the source ILCR after establishing a tunnel with the destination AGW;
  • the ILCR further includes a mapping information maintenance module, configured to report, update, and update the AID-RID mapping information of the communication peer end of the terminal to the terminal home ILR, and maintain the AID-RID mapping of the communication peer end of the terminal that is not updated to the terminal home ILR. information;
  • the interception control module of the ILCR sends the communication peer end information transmission request to the terminal home ILR, and further carries the mapping information that the mapping information maintenance module has not updated to the communication peer end of the terminal belonging to the ILR, and notifies the mapping information maintenance module to stop cutting out
  • the RID registration request sent by the RID registration module carries the mapping information of the communication peer that carries the mapping information maintenance module has not been updated to the terminal home ILR.
  • the AGW cut-out control module sends a communication peer information transmission request to the terminal home ILR after receiving the handover response sent by the target AGW;
  • the ILCR further includes a mapping information maintenance module, configured to report, update, and update the AID-RID mapping information of the communication peer end of the terminal to the terminal home ILR, and maintain the AID-RID mapping of the communication peer end of the terminal that is not updated to the terminal home ILR.
  • a mapping information maintenance module configured to report, update, and update the AID-RID mapping information of the communication peer end of the terminal to the terminal home ILR, and maintain the AID-RID mapping of the communication peer end of the terminal that is not updated to the terminal home ILR.
  • the AGW cut-out control module sends a handover notification to the source ILCR after sending the communication peer information transmission request to the terminal home ILR;
  • the ILCR cutting out control module After receiving the switching notification sent by the source AGW, the ILCR cutting out control module sends a communication peer information transmission request to the terminal home ILR, where the mapping information maintenance module has not updated the mapping information of the communication peer end of the terminal belonging to the ILR. And notifying the mapping information maintenance module to stop the maintenance of the mapping information of the peer end communication end;
  • the RID registration request sent by the RID registration module further carries mapping information of the communication peer end carrying the mapping information maintenance module that has not been updated to the terminal home ILR.
  • the mapping information maintenance module of the ILCR obtains the communication peer AID-RID mapping information by:
  • the AID-RID mapping information of the communication peer is queried from the communication peer to the ILR; or the AID-RID mapping information of the communication peer is obtained by querying from the source AGW or the source ILCR.
  • the AGW further includes a tunnel establishment module; after the target ILCR is selected, the AGW of the AGW also sends a tunnel establishment notification to the tunnel establishment module; the tunnel establishment module is configured to pass the tunnel after receiving the tunnel establishment notification. Establishing a process to establish a dynamic tunnel between the terminal and the target ILCR; or
  • the AGW further includes a tunnel establishment module, where the tunnel establishment module is configured to establish a static tunnel with the ILCR after power-on; the target ILCR learns that the terminal switches and acquires the terminal according to the notification of the target AGW or by checking the data packet. AID.
  • the RID registration module is located in the ILCR, and the interception control module of the ILCR receives the new RID of the handover terminal returned by the RID assignment module, and sends a RID registration request to the home terminal ILR of the handover terminal;
  • the packet 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.
  • the received data packet is sent to the cut-in terminal to solve the RID encapsulation. Forwarded to the target AGW;
  • 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 is forwarded. A data channel with the cut-in terminal is sent to the hand-in terminal.
  • the target AGW establishes a downlink forwarding tunnel with the target ILCR, and the source ILCR stops decapsulating according to the notification, corresponding to the fourth, fifth, and eighth transformations of the embodiment
  • the tunnel establishment module in the AGW After receiving the tunnel establishment notification for the handover terminal, the tunnel establishment module in the AGW establishes or selects the first tunnel and the second tunnel between the target ILCR and the target terminal.
  • the packet forwarding module in the ILCR After the packet forwarding module in the ILCR receives the data packet sent to the cut-out terminal, the number is forwarded to the number According to the packet, the RID is encapsulated and forwarded to the source AGW.
  • the intercepted terminal sent from the first tunnel or the generalized forwarding plane has not solved the RID-encapsulated data packet, and then performs RID encapsulation and forwards the packet to the target through the second tunnel.
  • AGW AGW
  • the packet forwarding module in the AGW forwards the data packet to the target AGW. After receiving the data packet sent by the source AGW to the cut-in terminal, the packet is forwarded to the target through the first tunnel. After receiving the data message sent by the target ILCR to the hand-in terminal, the device sends the data message to the hand-in terminal through the data channel between the user and the hand-in terminal;
  • the cut-out control module in the ILCR After receiving the handover notification sent by the target ILCR or the source AGW, the cut-out control module in the ILCR notifies the packet forwarding module in the ILCR to stop unpacking the data packet of the cut-out terminal.
  • the target AGW establishes a downlink forwarding tunnel with the target ILCR, which is decapsulated by the source ILCR, corresponding to the fourth, fifth, and eighth transforms of the embodiment
  • the tunnel establishment module in the AGW After receiving the tunnel establishment notification for the handover terminal, the tunnel establishment module in the AGW establishes or selects the first tunnel and the second tunnel between the target ILCR and the target terminal.
  • the packet forwarding module in the ILCR After receiving the data packet sent to the cut-out terminal, the packet forwarding module in the ILCR performs RID encapsulation on the data packet and forwards the data packet to the source AGW; and receives the data of the cut-in terminal sent from the first tunnel.
  • the packet is forwarded to the target AGW through the second tunnel; after receiving the data packet from the generalized forwarding plane, the RID is encapsulated and forwarded to the target AGW through the second tunnel;
  • the packet forwarding module in the AGW forwards the data packet to the target AGW. After receiving the data packet sent by the source AGW to the cut-in terminal, the packet is forwarded to the target through the first tunnel. After receiving the data message sent by the target ILCR to the hand-in terminal, the device sends the data message to the hand-in terminal through the data channel with the hand-in 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 before the forwarding tunnel between the source and the target ILCR is established, After receiving the RID encapsulation, the data packet sent to the terminal is forwarded to the source AGW, and the received data packet sent to the terminal is directly forwarded to the target through the forwarding tunnel after the forwarding tunnel is established.
  • the data packet sent to the hand-in terminal is directly forwarded to the target AGW before the forwarding tunnel between the source and the target ILCR is established; after the forwarding tunnel between the source and the target ILCR is established, the received message is sent to The data packet cut into the terminal is de-encoded, then forwarded or buffered, and then forwarded to the target AGW;
  • the packet forwarding module in the AGW forwards the data packet sent to the cut-out terminal to the
  • 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 use the target AGW to send the identifier information of the target ILCR different from the source ILCR.
  • the cut-out control module in the AGW is further configured to send the identifier information of the source ILCR to the target AGW; the hand-in control module in the AGW is further configured to use the source AGW to identify the source ILCR different from the target ILCR. Sending 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 cut-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, in the ILCR
  • the data forwarding packet sent by the source AGW is encapsulated by the RID and forwarded to the generalized forwarding plane; or
  • the packet forwarding module in the AGW forwards the data packet sent by the interception terminal to the source AGW if the data packet sent by the intercepted terminal data packet has not been established between the local AGW and the target ILCR, and is forwarded to the source AGW.
  • 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 packet to the source AGW.
  • the data packet sent by the terminal and the data packet sent by the ingress terminal sent by the target AGW are encapsulated by RID and then forwarded to the generalized forwarding plane.
  • the manner in which the hand-in control module in the AGW selects the target ILCR is one of the following modes:
  • 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;
  • 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. Further,
  • the RID registration module is located in the ILCR; after the handover control module in the ILCR sends an allocation notification to the RID allocation module and acquires a new RID allocated for the handover terminal, sends a registration notification to the RID registration module and carries the AID of the handover terminal. And a new RID; 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 handover terminal, and then sends the new RID to the target AGW; After receiving the new RID sent by the target ILCR for the handover terminal, the handover control module sends a registration notification to the RID registration module and carries the AID and the new RID of the handover terminal.
  • Embodiment 4 to Embodiment 10 are flowcharts of handover in the WiMAX network system 2 of the present invention using the identity identification and location separation technologies.
  • Figure 8 is applicable to the forwarding of data during the handover process using the forwarding tunnel between the access gateways.
  • the specific steps are as follows: Step 801, the same step 501;
  • the downlink data packet path the source ILCR receives the data packet sent by the communication peer to the terminal, The RID encapsulated in the data packet is removed and restored to the format of the data packet sent by the communication peer, and then forwarded to the source AGW.
  • the source AGW forwards the data packet to the target through the data channel between the source AGW and the target AGW.
  • the AGW, the target access gateway sends the message to the terminal through the terminal data channel.
  • 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 is forwarded to the source ILCR, and the source ILCR obtains the AID of the communication peer, and queries the AID-RID mapping information in the local cache. If the RID of the communication peer is found, the RID of the communication peer is used as the destination address, and the terminal As the source address, the RID is encapsulated in the data packet, and then the encapsulated data packet is forwarded to the generalized forwarding plane.
  • the data packet is encapsulated and forwarded to the mapping forwarding plane. And query the ILR for the RID of the communication peer. Or the data packet is cached locally. After the RID of the communication peer is obtained, the RID of the communication peer is used as the destination address, and the RID of the terminal is used as the source address, encapsulated in the data packet, and then the encapsulated data is encapsulated. The message is forwarded to the generalized forwarding plane.
  • the source ILCR reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • Step 802 When the target AGW is ready to initiate the AGW relocation, send an anchor DPF handover trigger message to the source AGW, where the step is optional.
  • Step 803 After the source AGW receives the target access gateway anchor DPF handover trigger message, and agrees to perform the anchor DPF handover, the source AGW sends the anchor DPF handover request message to the target AGW.
  • Step 804 the target AGW selects the target ILCR, initiates a forwarding tunnel establishment procedure 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 downstream data of the target AGW forwarding source AGW.
  • the target AGW needs to select the target ILCR in this step.
  • the tunnel between the access gateway and the ILCR can be in various ways, such as L2TPv3, IP-in-IP, MPLS (LDP-based and RSVP-TE based), GRE, MIP, IPsec, etc., the present invention is not limited to any particular tunneling method.
  • Step 805 The target AGW initiates a tunnel establishment process to the target ILCR.
  • the target ILCR may need to interact with the home AAA server to complete the authentication.
  • the tunnel between the access gateway and the ILCR may be in various manners, such as L2TPv3, IP-in-IP, MPLS (LDP-based and RSVP-TE based), GRE, MIP, IPsec, etc., and the present invention is not limited to any A specific way of tunneling.
  • MIP Mobility Management Entity
  • the tunnel is created and maintained in the same way as an existing WiMAX network.
  • Step 805a the target ILCR allocates a new RID to the terminal, and saves and updates the terminal AID-RID mapping information locally;
  • the uplink and downlink data packet paths of the terminal are as shown in D803 and D804.
  • 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 to the format.
  • 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 then sends the data to the target ILCR through the dedicated downlink forwarding tunnel.
  • the target ILCR passes the data between the target AGW and the target ILCR.
  • the tunnel is forwarded to the target AGW, and the target AGW sends the packet to the terminal through the terminal data channel.
  • 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 obtains the AID of the communication peer, and queries the local cache.
  • the AID-RID mapping information if the RID of the communication peer is found, the RID of the communication peer is used as the destination address, and the RID of the terminal is used as the source address, encapsulated in the data packet, and then the encapsulated data packet is forwarded.
  • the data packet is tunnel encapsulated and then forwarded to the mapping forwarding plane, and the RID of the communication peer is queried to the ILR. Or the data packet is cached locally. After the RID of the communication peer is obtained, the RID of the communication peer is used as the destination address, and the RID of the terminal is used as the source address, encapsulated in the data packet, and then the encapsulated data is encapsulated. The message is forwarded to the generalized forwarding plane.
  • the target ILCR and/or the source ILCR are reported to the terminal home ILR, Update the communication peer information, and optionally maintain and update the locally saved communication peer information. There may be that for the same communication peer, the source ILCR has updated the ILR, and the target ILCR updates the ILR again. At this time, the ILR overwrites the original data or does not process. This occurs in other embodiments in System 2, and the same processing is performed. , will not be detailed later.
  • Step 806 After allocating a new RID, the target ILCR initiates a RID registration process to the terminal home ILR, and brings the newly allocated RID to the ILR, and updates the terminal AID-RID mapping information on the ILR; if the locally saved communication peer information is further If there is no information about the terminal belonging to the ILR, the unreported information is carried in the message to report the terminal belonging to the ILR, and the ILR saves the information of the received communication peer. If the terminal belongs to the ILR, the communication peer AID-RID is saved. Mapping information, the target ILCR in the step of the communication to the terminal to the ILR communication peer information includes the terminal and the communication peer connection information, the communication peer AID-RID mapping information; otherwise, only need to report the terminal and communication pair Connection information at the end.
  • Step 807 After receiving the RID registration request of the target ILCR, the home ILR verifies the legality of the AID, and saves the mapping information of the current AID-RID of the terminal.
  • This step can be performed in the ILCR to the home AAA authentication process in step 805. Thereafter, the terminal uplink and downlink data is as shown in D805 and D806.
  • 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.
  • the uplink data is the path of the text. Same as D804.
  • the target ILCR reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • Step 808 The target AGW sends an anchor DPF handover response to the source AGW to complete the handover of the AGW.
  • Step 809 The source AGW initiates a handover notification to the source ILCR, notifying the source ILCR that the handover is complete, and the trigger source ILCR notifying the ILR to initiate an update communication peer process;
  • Step 810 The source ILCR sends a communication peer end information transfer request to the terminal home ILR; if the locally stored communication peer information still has the information that the terminal does not report the ILR, the unreported information is carried in the message reporting terminal. Attributable to the ILR, the ILR holds the information of the received communication peer. If the terminal AID-RID mapping information is stored in the terminal belonging to the ILR, the source ILCR is sent to the communication peer information of the terminal belonging to the ILR in this step. It includes the connection information between the terminal and the communication peer, and the communication peer AID-RID mapping information; otherwise, only the connection information of the terminal and the communication peer is required.
  • Step 811 The terminal belonging to the ILR notifies the ILCR of the communication peer to update the terminal AID-RID mapping information;
  • Step 812 After the terminal home ILR completes the communication peer update, it responds to the source ILCR with the communication peer information transmission response message, and notifies the source ILCR communication peer that the update is completed.
  • Step 813 The source ILCR sends a response confirmation message to the source AGW.
  • the terminal home ILR may also perform step 812 immediately after step 810 without waiting for completion of step 811.
  • step 812 means that the ILR confirms receipt of the source ILCR message.
  • the source ILCR may be sent an update communication peer completion message, and the source ILCR may also send a message to the source AGW.
  • Step 815 the source AGW release or the target AGW releases the data channel between the two;
  • This step may be started after step 808, or may be started after receiving the notification that the ILR completes updating the communication peer (such as step 813). In order to better ensure the continuity of the data, it may also be triggered by a timer, as in the step. Set the timer after 808 or step 813. After the timer expires, the tunnel is released.
  • Step 815 the source AGW releases the tunnel between the source ILCR and the source ILCR.
  • Step 816 The target AGW releases a downlink forwarding tunnel with the target ILCR.
  • Step 817 The target AGW initiates a context reporting process to the target base station, and sends the new AGW to the target base station.
  • This step can be performed after step 808.
  • the source ILCR does not know whether the target ILCR exists, and when the tunnel between the source and the target AGW is successfully established, so the source ILCR always sends the data message sent to the terminal to the received communication peer.
  • RID decapsulation is performed, at which point the target ILCR will not be decapsulated, such as D803.
  • the forwarding tunnel between the target AGW and the target ILCR may not be established or used, and the target AGW and the source AGW directly use the tunnel to perform data forwarding, such as D801.
  • the target AGW may notify the source ILCR to stop decapsulation of the downlink packet by using the source AGW, and then the downlink data packet path is: the source ILCR receives the communication peer.
  • the data message sent to the terminal is forwarded 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 then sends the data packet to the target ILCR through the dedicated downlink forwarding tunnel.
  • the ILCR strips the RID encapsulated in the data packet and restores the format of the data packet sent by the communication peer
  • the data is forwarded to the target AGW through the tunnel between the target AGW and the target ILCR, and the target AGW passes the packet again.
  • the terminal data channel is sent to the terminal.
  • the uplink data packet is forwarded from the tunnel, such as D804 and D806.
  • the uplink data may 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.
  • the source AGW triggers the source ILCR to notify the ILR to initiate the ILR update communication peer process in step 809.
  • step 809 may also be advanced to step 803.
  • the terminal belongs to the ILR.
  • the manner in which the target ILCR obtains the RID of the communication peer is substantially the same as the manner in which the AGW obtains the communication peer RID in the system, and only needs to change the performer to the target ILCR, and in the third mode, the target ILCR is the slave source. ILCR gets relevant information.
  • Other embodiments of System 2 can also use the same method to obtain the RID of the communication peer.
  • the ILCR (including the source ILCR and the target ILCR) is updated to the ILR.
  • the method for updating the communication peer information is substantially the same as the method in the system one, and the difference is that the performer is the ILCR.
  • the specific differences are as follows (only the difference is described here, the same part is not detailed)
  • the ILCR serving the terminal discovers a new communication peer in the process of transmitting and receiving data, for example, according to the real-time detection mechanism of the flow,
  • the connection information between the terminal and the communication peer ie, the correspondence between the terminal AID and the AID of the communication peer
  • the AID-RID mapping information of the communication peer are saved.
  • Step 1604 The ILCR sends a communication peer information notification request message to the terminal home ILR, and carries the related information.
  • Step 1606 The home ILR responds to the ILCR, and the ILCR processes the locally cached related information.
  • the ILCR updates the locally saved communication peer AID-RID mapping information after receiving the notification of the communication peer home ILR.
  • the communication peer AID-RID mapping information is reported to the home ILR, and the terminal needs to notify the home ILR to update the AID-RID mapping information of the communication peer.
  • the ILCR notifies the terminal home ILR to delete the mapping information of the relevant communication peer.
  • the method for the terminal to belong to the ILR to update the communication peer is substantially the same as the method in the system 1.
  • the access gateway in the method only needs to be changed to the ILCR.
  • Figure 9 is applicable to the scenario in which the data forwarding in the handover process uses the forwarding tunnel between the access gateways, and the specific steps are as follows: Steps 901-902, the same steps 801-802;
  • the source ILCR reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • Step 903 After the source AGW receives the target AGW anchor DPF handover trigger message, and the anchor DPF handover is agreed, the source AGW sends an anchor DPF handover request message to the target AGW, where the message needs to carry the identifier information of the source ILCR.
  • the identification information may be an address or a dedicated identifier.
  • Step 904 in the same step 804, the identifier information of the source ILCR may be brought to the target ILCR during the tunnel establishment process;
  • Step 905 the same step 805, the source ILCR identification information can be brought to the target ILCR during the tunnel establishment process;
  • Step 906 The target ILCR sends a handover notification to the source ILCR according to the source ILCR identification information obtained in step 904 or 905. If the source ILCR is different from the target ILCR, the source ILCR is notified that the handover is being performed, and the trigger source ILCR notifies the ILR to initiate the update communication. Peer process, otherwise do not perform this step;
  • Steps 907, 908 are the same as steps 810, 812;
  • Step 909 The source ILCR sends a handover confirmation message to the target ILCR.
  • the uplink and downlink data of the terminal is as shown in D903 and D904.
  • the downlink data packet path is: 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 through the data channel between the source AGW and the target AGW.
  • AGW the target AGW is sent to the target ILCR through the dedicated downlink forwarding tunnel.
  • the target ILCR strips the RID encapsulated in the data packet, restores the format of the data packet sent by the communication peer, and passes the data through the target AGW and the target ILCR.
  • the tunnel is forwarded to the target AGW, and the target AGW sends the packet to the terminal through the terminal data channel.
  • D904 is the same as D804.
  • the target ILCR reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • Step 905a step 910, step 911, step 912, step 913, steps 914 to 917, step 805a, step 806, step 807, step 811, step 808, steps 815 to 818.
  • D905 and D906 are the same as D805 and D806.
  • Steps 906 through 909 may also be performed after step 910 in this embodiment.
  • the uplink data packet is forwarded from the tunnel, such as D904 and D906.
  • the uplink data may 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.
  • Figure 10 is applicable to the scenario in which the data is forwarded during the handover process using the forwarding tunnel between the ILCRs, and the target ILCR initiates the tunnel establishment between the ILCRs.
  • the specific steps are as follows:
  • the source ILCR reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • Step 1004 the same step 905;
  • Step 1005 The target ILCR initiates a process of establishing a forwarding tunnel to the source ILCR according to the identifier information of the source ILCR obtained in step 1004. If the target ILCR is different from the source ILCR, the tunnel between the ILCRs may be in multiple manners. For example, L2TPv3, IP-in-IP, MPLS (LDP-based and RSVP-TE based), GRE, MIP, IPsec, etc., the present invention is not limited to any particular tunneling method.
  • Step 1004a the same step 905a;
  • Step 1006 to step 1009 the same steps 906 to 909;
  • the uplink and downlink data packet paths of the terminal are as shown in D 1003 and D1004.
  • 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 restores the packet to the communication peer. After the format of the data packet is forwarded to the target AGW, the target AGW sends the packet to the terminal through the terminal data channel.
  • the target ILCR reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • step 1005 may be completed before the step 1004, and the downlink data packet needs to be in the target ILCR. Cache first, after step 1004 is completed Then send it to the target AGW. At this time, the uplink data packet path is the same as D1002.
  • D1005 and D1006 are the same as D905 and D906.
  • the target ILCR reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • step 1015 the source ILCR or the target ILCR initiates the release of the data forwarding tunnel between the two; in the embodiment, steps 1006 to 1009 may also be performed after step 1010. Alternatively, steps 1006 to 1009 are not performed, and steps 809 to 813 are performed after step 1013 or 1003.
  • the uplink data packet is forwarded from the tunnel, such as D1004 and D1006.
  • the uplink data may also be forwarded from the tunnel between the target ILCR and the source ILCR.
  • Figure 11 is applicable to the scenario where the data forwarding in the handover process uses the forwarding tunnel between the ILCRs, and the source ILCR initiates the establishment of the inter-ILCR forwarding tunnel.
  • the specific steps are as follows:
  • Step 1101 the same step 1001 ;
  • the source ILCR reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • Step 1102 When the target AGW is ready to initiate the AGW relocation, select the target ILCR, send the anchor DPF handover trigger message to the source AGW, and carry the target ILCR identification information in the message; where the identifier information may be an address or a special identifier. .
  • Step 1103 to step 1105 the same steps 703 to 705;
  • the source AGW determines that the handover needs to be performed across the ILCR according to the identifier information of the target ILCR, it sends an ILCR handover request to the source ILCR, and carries the target ILCR identification information; otherwise, steps 1103-1105 are not performed. Thereafter, the uplink and downlink data message paths of the terminal are as shown in D1 103 and D1104.
  • 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, and forwards the tunnel through the tunnel. Forwarded to the target ILCR, the downlink data message needs to be cached first on the target ILCR.
  • Step 1106 The source AGW sends an anchor DPF handover request message to the target AGW.
  • Step 1107 The target AGW initiates a tunnel establishment process to the target ILCR.
  • the target ILCR may need to interact with the home AAA server to complete the authentication.
  • the tunnel between the access gateway and the ILCR may be in various manners, such as L2TPv3, IP-in-IP, MPLS (LDP-based and RSVP-TE based), GRE, MIP, IPsec, etc., and the present invention is not limited to any A specific way of tunneling.
  • MIP Mobility Management Entity
  • Step 1107a the same step 1004a;
  • the uplink and downlink data packet paths of the terminal are as shown in D1105 and D1106.
  • the downlink data packet buffered on the target ILCR in D1103 needs to be forwarded to the target AGW at this time.
  • the target ILCR reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • D1107 and D1108 are the same as D805 and D806.
  • step 1118 the source ILCR or the target ILCR initiates the release of the data forwarding tunnel between the two.
  • step 1111 to step 1115 may be performed simultaneously with step 1106.
  • the terminal belonging ILR receives the source ILCR. After the communication peer information is transmitted, the update process of the communication peer is not started, and the RID is registered after being received.
  • step 1111 to step 1115 may not be performed, but steps 1006 to 1009 may be performed after step 1107 or 1108.
  • the uplink data packet is forwarded from the tunnel, such as D1106 and D1108.
  • the uplink data packet can also be forwarded from the tunnel between the target ILCR and the source ILCR.
  • Figure 12 is applicable to the forwarding of data during the handover process.
  • the scenario of the forwarding tunnel between access gateways is basically the same as that of Figure 8.
  • the specific steps are described as follows:
  • the source AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • Step 1205b after step 1205a, the RID newly allocated by the target ILCR needs to be brought to the target AGW in the tunnel establishment process.
  • the target AGW or the source AGW may report and update the communication peer information to the terminal home ILR, and optionally maintain and update the locally saved communication peer information. There may be that for the same communication peer, the source AGW has updated the ILR, and the target AGW updates the ILR again. At this time, the ILR overwrites the original data or does not process. This occurs in other embodiments in System 2, and the same processing is performed. , will not be detailed later.
  • Step 1206 After receiving the newly allocated RID, the target AGW initiates a RID registration process to the terminal home ILR, and brings the newly allocated RID to the ILR to update the terminal AID-RID mapping information on the ILR.
  • this step can also be performed by the target ILCR.
  • the communication peer information includes connection information between the terminal and the communication peer.
  • the target AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • Step 1209 The source AGW sends a communication peer end information transmission request to the terminal home ILR; if the locally stored communication peer information still has the information that the terminal does not report the ILR, the unreported information is carried in the message reporting terminal.
  • the ILR stores the information of the received communication peer.
  • the communication peer information reported by the source AGW includes the connection information between the terminal and the communication peer.
  • Step 1210 The source AGW sends a handover notification to the source ILCR.
  • the source AGW needs to trigger the source ILCR to report the ILR information.
  • Step 1211 After receiving the message of the source AGW, the source ILCR sends a communication peer information transmission request to the terminal home ILR, where the message carries the communication peer AID-RID mapping information of the unreported terminal belonging to the ILR;
  • Step 1212 The terminal home ILR uses the ILR to update the communication peer to notify the communication peer to access the ILCR update terminal AID-RID mapping information;
  • step 1213 the terminal home ILR completes the communication peer update, and responds to the source ILCR with the communication peer information delivery response message, and the source ILCR sends a response confirmation message to the source gateway AGW.
  • step 1215 the terminal belongs to the ILR to complete the communication peer. After the update, the source AGW is replied to the communication peer information delivery response message;
  • the terminal home ILR can also perform steps 1215 and 1213 immediately after steps 1209 and 1211 without waiting for the completion of step 1212. At this time, steps 1213 and 1215 mean that the ILR confirms the receipt of the source ILCR and the source AGW message. After the ILR performs step 1212, the source ILCR and the source AGW may be sent an update communication peer completion message.
  • Step 1216 to step 1219 are the same as steps 814 to 817.
  • the source ILCR does not know whether the target ILCR exists, and when the tunnel between the source and the target AGW is successfully established, so the source ILCR will always send data packets to the terminal to the received communication peer.
  • RID decapsulation is performed, at which point the target ILCR will not be decapsulated, such as D1203.
  • the target AGW may notify the source ILCR to stop decapsulation of the downlink packet by using the source AGW, and then the downlink data packet path is: the source ILCR receives the communication peer.
  • the data message sent to the terminal is forwarded 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 then sends the data packet to the target ILCR through the dedicated downlink forwarding tunnel.
  • the ILCR strips the RID encapsulated in the data packet and restores the format of the data packet sent by the communication peer
  • the data is forwarded to the target AGW through the tunnel between the target AGW and the target ILCR, and the target AGW passes the packet again.
  • the terminal data channel is sent to the terminal.
  • the uplink data packet is forwarded from the tunnel, such as D1204 and D1206.
  • the uplink data may 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.
  • step 1209 to step 1215 may also be advanced to step 1203.
  • the terminal home ILR receives the communication peer end information transmission request of the source AGW and the source ILCR, the communication is not started.
  • the peer update process starts after the RID registration is received.
  • the manner in which the target ILCR obtains the RID of the communication peer is the same as the manner in which the target ILCR in the other embodiments of the system 2 obtains the communication peer RID.
  • Other embodiments of System 2 can also use the same method to obtain the RID of the communication peer.
  • 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 to perform maintenance according to the real-time detection result of the flow, or the AGW detects and maintains itself.
  • the method for reporting and updating the communication peer information to the ILR in the handover procedure of the eighth embodiment to the tenth embodiment is substantially the same as the method in the system one, except that the connection information between the AGW and the ILR is related to the communication peer.
  • the AGW triggers the ILCR to map the peer AID-RID to the ILR.
  • Steps 1602, 1603, in the process of sending and receiving data by the ILCR serving the terminal, discovering new The communication peer end saves the AID-RID mapping information of the communication peer. And notifying the access gateway to save the connection information between the terminal and the communication peer end (ie, the AID mapping information of the terminal and the communication peer end); or the access gateway serving the terminal in the process of sending and receiving data, discovering a new communication peer end, such as according to the flow
  • the real-time detection mechanism saves the connection information between the terminal and the communication peer.
  • Step 1604 The AGW sends a communication peer information notification request to the terminal home ILR, and carries the connection information between the terminal and the communication peer;
  • the AGW sends a message to the IICR, triggering the ILCR to report the AID-RID mapping information of the communication peer that is not reported to the ILR to the terminal home ILR.
  • Step 1606 the home ILR returns a response to the AGW and the ILCR.
  • the AGW processes the connection information between the locally cached terminal and the communication peer.
  • the ILCR updates the locally saved communication peer AID-RID mapping information after receiving the notification of the communication peer home ILR.
  • the communication peer AID-RID mapping information is reported to the home ILR, and the terminal needs to notify the home ILR to update the AID-RID mapping information of the communication peer.
  • the ILCR notifies the terminal home ILR and the access gateway to delete the mapping information of the relevant communication peer.
  • the method in which the terminal belongs to the ILR to update the communication peer is the same as the method in the fourth embodiment to the seventh embodiment.
  • Figure 13 is applicable to the scenario in which the data is forwarded during the handover process using the forwarding tunnel between the ILCRs and the ILCR is initiated by the target ILCR.
  • the process is basically the same as that in Figure 10.
  • the specific steps are as follows:
  • Step 1301 to step 1304, step 1304a the same steps 1001 to 1004, 1004a; D1301, D1302 are the same as D1001, D1002.
  • the source AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • Step 1304b the same step 1205b;
  • the target AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • D1305 and D1306 are the same as D1005 and D1006.
  • the target AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • the source ILCR or the target ILCR initiates the release of the data forwarding tunnel between the two.
  • the uplink data packet is forwarded from the tunnel, such as D1304 and D1306.
  • the uplink data may 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.
  • step 1309 to step 1315 may also be advanced to step 1303.
  • the terminal home ILR receives the communication peer end information transmission request of the source AGW and the source ILCR, the communication is not started.
  • the peer update process starts after the RID registration is received.
  • Figure 14 is applicable to the scenario where the data forwarding in the handover process uses the forwarding tunnel between the ILCRs, and the source ILCR initiates the establishment of the inter-ILCR forwarding tunnel.
  • the flow is basically the same as that in Figure 11. The specific steps are described as follows:
  • Step 1401 to step 1407, step 1407a the same step 1101 to step 1107, step 1107a;
  • the source AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • Step 1407b the same step 1207b; D1405, D1406, same as D1105, D1106.
  • the target AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • Step 1408 to step 1421 the same step 1306 to step 1319;
  • the target AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • the uplink data packet is forwarded from the tunnel, such as D1406 and D1408.
  • the uplink data may 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.
  • step 1409 to step 1415 may also be performed simultaneously with step 1403.
  • the terminal home ILR receives the communication peer end information transmission request of the source AGW and the source ILCR, the communication is not started.
  • the peer update process starts after the RID registration is received.
  • the AGW change does not necessarily lead to the change of ILCR. Therefore, the source AGW needs to identify the information according to the target ILCR, or the target AGW needs to determine whether the ILCR changes according to the source ILCR identification information.
  • 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 a tunnel between the two.
  • the target ILCR is the same, the ILCR can also decide whether to allocate a new RID to the terminal according to the policy. When assigning a new RID to the terminal, the flowchart of this patent can be used.
  • the embodiment 1 to the embodiment 10 shown in FIG. 5 are all examples of a dynamic tunnel between the AGW and the ILCR.
  • the foregoing embodiments can also be applied to a scenario in which a static tunnel between the AGW and the ILCR is used.
  • a dynamic tunnel is no longer needed between the target AGW and the target ILCR.
  • the tunnel between the two is successfully created when the two are powered on.
  • the other steps are the same.
  • the tunnel between the two can be used to notify the target ILCR that there is a terminal handover and the AID of the terminal is sent to the target ILCR, or the target ILCR learns that there is a terminal handover and acquires the terminal by checking the data packet.
  • AID System three
  • FIG 4b is a schematic diagram of a network architecture of another Wimax system employing the above-described identity and location separation techniques, with solid lines indicating the connections of the bearer planes and dashed lines indicating the connections 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 wide forwarding plane can 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 (ILR)/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.
  • the ILCR does not exist in the WiMAX network
  • 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 to the ILR, and query the ILR for the RID of the communication peer, and the maintenance is not updated to the ILR.
  • the ILR is configured to receive a registration and deregistration request of the AGW to the ILR home subscriber terminal, maintain AID-RID mapping information of the home subscriber terminal, and receive a query request for the terminal RID, and return the RID corresponding to the terminal AID in the request.
  • the query requesting party After receiving the trigger message for updating the communication peer, the query requesting party notifies the gateway accessed by the communication peer to update the terminal AID-RID mapping information.
  • the AGW 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, and register the terminal with the terminal belonging to the ILR.
  • RID of the terminal after the terminal is cut out, the resources allocated to the terminal are released; and the data packet of the cut-in and the cut-out terminal is forwarded;
  • the ILR is configured to register an RID of the update terminal, and send a RID update notification to the gateway accessing all communication peers of the terminal after receiving the trigger message of the update communication peer.
  • the AGW includes:
  • the cut-out control module is configured to send an AGW handover request to the target AGW, and release the resource allocated for the terminal after the handover is completed;
  • 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 a communication peer information transmission request to the ILR. And returning an AGW handover response to the source AGW; the AGW handover request sent by the cut-out control module to the target AGW is an anchor data channel function (DPF) handover request; and the AGW handover response sent by the handover control module to the source AGW is Anchor the DPF switch response.
  • RID location identifier
  • DPF anchor data channel function
  • 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 connection information maintenance module is configured to report, update, and update connection information between the terminal and the communication peer end to the home ILR, and maintain connection information between the terminal and the communication peer that are not updated to the terminal home ILR, where the connection information between the terminal and the communication peer includes the Correspondence relationship information between the terminal AID and all communication peer AIDs;
  • the packet forwarding module is configured to perform RID encapsulation and de-RID encapsulation on the data packet that is cut into the terminal. After receiving the downlink data packet sent to the cut-out terminal, the packet is forwarded to the target through the forwarding tunnel with the target AGW.
  • the AGW when receiving the downlink data packet sent to the hand-in terminal, sends the data to the terminal through the data channel of the terminal, and is also used to parse the connection information between the terminal and the communication peer end from the data message of the received terminal. And notify the connection information maintenance module for maintenance;
  • the ILR includes: a registration processing module, configured to: after receiving the registration request of the RID sent by the AGW, register the correspondence information of the AID and the RID of the updated terminal;
  • the RID update module is configured to initiate a RID update process according to the received update communication peer trigger message, and send 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, specifically,
  • the gateway that the communication peer accesses is determined according to the mapping information of the communication peer AID-RID, the local configuration information, or the DNS query, and the RID is sent to the gateway accessed by the communication peer.
  • the update notification carries the mapping information of the terminal AID and the new RID.
  • the connection information maintenance module updates the connection information of the terminal and the communication peer to the terminal in real time to the terminal, and updates the RID update module of the ILR to initiate the update of the RID update process.
  • the communication peer trigger message refers to the RID registration request sent by the AGW. .
  • the connection information maintenance module periodically reports or updates the connection information of the terminal and the communication peer to the terminal home ILR;
  • the cut-out control module is further configured to send a communication peer information transmission request to the terminal home ILR after receiving the handover response sent by the destination AGW, where the terminal and the communication pair that the connection information maintenance module has not updated to the terminal belonging to the ILR The connection information of the terminal, and notifying the connection information maintenance module to stop the maintenance of the connection information of the cut-out terminal;
  • the RID registration request sent by the RID registration module carries the connection information that the connection information maintenance module has not updated to the terminal that belongs to the terminal ILR and the communication peer;
  • the RID update module that triggers the ILR initiates an update communication peer trigger message of the RID update process, and refers to the subsequent communication peer information transfer request or RID registration request.
  • the AGW further includes a mapping information maintenance module, configured to report, update, and update the AID-RID mapping information of the communication peer end of the terminal to the terminal home ILR, and maintain the AID-RID mapping of the communication peer end of the terminal that is not updated to the terminal home ILR. information.
  • the mapping information maintenance module of the AGW acquires the side of the communication peer AID-RID mapping information The same as system one;
  • the cut-out control module When the cut-out control module sends a handover request to the target AGW, the first control is sent to the packet forwarding module in the local AGW;
  • the handover control module When the handover control module receives the handover request from the source AGW, the handover control module sends a second notification to the packet forwarding module in the local 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.
  • 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.
  • 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 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; and before receiving the second notification, the received uplink terminal sends the uplink The data packet 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.
  • Figure 15 is a flow chart showing the three-switching of the WiMAX network system using the access identification and location separation techniques of the present invention.
  • Figure 15 is applicable to the scenario in which the data is forwarded during the handover process using the forwarding tunnel between the access gateways.
  • the specific steps are as follows: Step 1501, the same step 501;
  • terminal uplink and downlink data is as shown in D 1501 and D1502.
  • 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 packet is forwarded to the target AGW through the data channel between the source AGW and the target AGW, and the target access gateway sends the packet to the terminal through the terminal data channel.
  • 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 obtains the AID of the communication peer, and queries the AID-RID mapping information in the local cache. If the RID of the communication peer is found, the RID of the communication peer is used as the destination address, and the RID of the terminal is used as the source address, and is encapsulated in the In the data packet, the encapsulated data packet is forwarded to the target generalized forwarding plane.
  • the data packet is tunnel encapsulated and then forwarded to the mapping forwarding plane, and the ILR is queried to the communication peer. RID. Or the data packet is cached locally. After the RID of the communication peer is obtained, the RID of the communication peer is used as the destination address, and the RID of the terminal is used as the source address, encapsulated in the data packet, and then the encapsulated data is encapsulated. The message is forwarded to the generalized forwarding plane.
  • the source AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • Step 1502 to step 1504 the same steps 502 to 504;
  • terminal uplink and downlink data is as shown in D 1503 and D1504.
  • 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 packet to the terminal through the terminal data channel.
  • 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 obtains the AID of the communication peer, and queries the AID-RID mapping information in the local cache, for example, To the RID of the communication peer, the RID of the communication peer is used as the destination address, and the RID of the terminal is used as the source address, encapsulated in the data packet, and then the encapsulated data packet is forwarded to the generalized forwarding plane; The RID of the communication peer is tunnel encapsulated and forwarded to the mapping forwarding plane, and queries the ILR for the RID of the communication peer. Or the data packet is cached locally.
  • the RID of the communication peer After the RID of the communication peer is obtained, the RID of the communication peer is used as the destination address, and the RID of the terminal is used as the source address, encapsulated in the data packet, and then the encapsulated data is encapsulated. >3 ⁇ 4 text is forwarded to the generalized forwarding plane.
  • the target AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • D1505 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 ingress gateway sends the message to the terminal through the terminal data channel.
  • the uplink data is the path of the text, the same as D1504.
  • the target AGW reports and updates the communication peer information to the terminal home ILR, and optionally maintains and updates the locally saved communication peer information.
  • step 1509 there may be a data message forwarded by the source AGW, which is caused by not updating the gateway AID-RID mapping information of the gateway accessed by the communication peer.
  • the downlink data message path is the same as D1503.
  • Step 1512 the same step 514;
  • the uplink data packet is directly forwarded from the target AGW, such as D1504 and D1506.
  • 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.
  • the source AGW triggers the ILR to update the communication peer process in step 1507.
  • step 1508 may also be advanced to step 1503.
  • the terminal home ILR receives the source AGW. After the communication peer information is transmitted, the update process of the communication peer is not started, and the RID is registered after being received.
  • the manner in which the target AGW obtains the RID of the communication peer is the same as the manner in which the communication peer RID is obtained in the system.
  • the method for the AGW to update the communication peer information to the ILR is the same as the method for reporting and updating the communication peer information to the ILR in the system one, but the AGW no longer interacts with the ILCR.
  • the method for the terminal to belong to the ILR to update the communication peer is the same as the method for updating the communication peer in the system 1.
  • the access gateway or ILCR with the target side is returned to the terminal. It is an ILR that performs terminal RID registration.
  • the access gateway or ILCR on the source side can obtain the RID assigned by the target side network element to the terminal after interacting with the target side network element, and then perform terminal RID registration to the ILR.
  • 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.
  • the non-fixed anchor point switching method of the Wimax system of the present invention and the mobile communication network of the Wimax system that separates the identity and the location are applied to the WiMAX network, and when the terminal performs mobile switching, the terminal home identity register (ILR) is used.
  • the gateway AGW, ILCR or other gateway such as the border gateway
  • the communication peer access is notified to update the terminal AID-RID mapping information, thereby realizing the switch without fixed anchor point, thereby reducing
  • the path of the data packet is detoured, which reduces the transmission delay and bandwidth waste, and can also achieve the purpose of solving the dual identity of the IP address.

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Abstract

本发明公开了一种实现无固定锚点切换的Wimax系统及其切换方法,所述方法包括:终端完成Wimax接入业务网络锚定的切换后,源AGW向目标AGW发送AGW切换请求;该目标AGW收到源AGW切换请求后,为该终端分配指向本AGW的新的位置标识,保存该终端身份标识与该新的位置标识的映射信息;该目标AGW发起位置标识注册流程,更新该终端归属ILR保存的该终端的位置标识;且该终端归属ILR收到更新通信对端的触发消息后发起位置标识更新流程,向该终端所有通信对端接入的网关发送位置标识更新通知,携带该终端的身份标识及新的位置标识;该目标AGW向该源AGW发送AGW切换响应,完成切换,该源AGW释放为该终端分配的资源,该终端和通信对端间的数据报文经该目标AGW转发。

Description

实现无固定锚点切换的 Wimax系统及其切换方法
技术领域
本发明涉及通信技术领域的切换, 尤其涉及一种实现无固定锚点切换的 Wimax系统及其切换方法。 背景技术
在传统的传输控制协议 /网络协议 ( Transmission Control Protocol/Internet Protocol, TCP/IP ) 网络环境中, IP为因特网 (Internet)提供了路由功能, 它给 所有节点 (包括主机和路由器)都分配了逻辑地址, 即 IP地址, 且每台主机 的各个端口都分配一个 IP地址。 IP地址包括网络前缀和主机部分, 同一条链 路上的所有主机的 IP地址通常有相同的网络前缀和不同的主机部分。 这使得 IP可以依据目的节点的 IP地址的网络前缀部分来进行路由选择,从而使路由 器秩序保存一条简单的网络前缀路由, 而不必为每台主机保存一条单独的路 由。 在这种情况下, 由于釆用了网络前缀路由, 因此当节点从一条链路切换 到另一条链路而没有改变其 IP地址时, 该节点则不可能在新链路上接收到数 据报文, 从而也就无法与其他节点进行通信。
现有应用 TCP/IP协议的网络技术存在如下不足:
釆用固定锚点的方式支持终端的移动性, 如, 长期演进(Long Term Evlution, LTE )网络中釆用 GPRS隧道协议( GPRS Tunnelling Protocol, GTP ) ,
GW)作为终端的移动锚点; Wimax网络中釆用移动 IP ( Mobile IP, MIP ) , 把家乡代理(Home Agent, HA )作为锚点。 固定锚点的引入带来了数据包路 径迂回的问题, 加重了传输延时和带宽浪费。 而 MIPV6的路由优化过程需要 参与通信的主机支持 MIPV6协议, 部署困难。
IP地址具有双重功能: 既作为网络层的通信终端主机网络接口在网络拓 朴中的位置标识, 又作为传输层主机网络接口的接入标识。 当主机的 IP地址 发生变化时, 不仅路由要发生变化, 通信终端主机的接入标识也会发生变化, 这样会导致路由负载越来越重, 而且主机标识的变化会导致应用和连接的中 断。
身份标识和位置分离问题提出的目的是为了解决 IP地址的语义过载和路 由负载严重等问题, 将 IP地址的双重功能进行分离, 实现对移动性、 多家乡 性、 IP地址动态重分配、 减轻路由负载及下一代互联网中不同网络区域之间 的互访等问题的支持。现有的身份标识和位置分离框架主机标识协议(HIP )、 名址分离网络协议(LISP )等是为了克服现有网络技术的这一不足而构建的 一种网络框架。 基于主机的 HIP等需要对终端及上层业务做较大改动, 部署 困难; 通信两端同时移动、 位置更新阶段需要网络参与维护通信链路, 否则 将发生报文丟失问题。 基于网络的 LISP, 对于移动性和多穴性是身份标识和 位置分离后附带解决的问题, 现在还没有具体的方案和实现方法。
图 1是现有微波接入全球互通(Wimax ) 系统的网络架构, 如图所示, 现有技术的 Wimax 系统一般由三部分组成: 终端、 Wimax接入业务网络 ( Wimax Access Service Network, 简称 W-ASN )和 Wimax连接业务网络 ( Wimax Connect Service Network, 简称 W-CSN ) 。
W-ASN主要执行如下的功能: 完成 WiMAX终端的二层(L2 )连接、 传 递认证授权计费 ( Authentication、 Authorization and Accounting , AAA )消息 到 H-CSN (归属 CSN ) 、 网络服务运营商 (Network Service Provider, NSP ) 的网络选择与发现、 为 WiMAX终端的三层(L3 )连接提供中继、 无线资源 管理、 W-ASN与 W-CSN之间隧道维护。 在移动的场景下, W-ASN还需要 支持如下的功能: W-CSN锚定的移动性管理( W-CSN Anchored MM ) 、 寻 呼和空闲模式( Idle Mode )操作;
W-ASN还用于管理 IEEE 802.16空中接口, 为 WiMAX终端用户提供无 线接入。 W-ASN至少由一个基站( Base Station, BS )和一个接入网关( W-ASN Gateway, AGW )组成, 可以包含单个 AGW或多个 AGW。 W-ASN在 R1 参考点与移动台 (Mobile Station, MS ) (文中统称为终端)互通, 在 R3参 考点与 W-CSN互通,在 R4参考点与另一个 W-ASN互通。其中,管理 W-ASN 的运营商称为 NAP ( Network Access Provider , 网络接入运营商) 。
W-CSN是一套网络功能的组合, W-CSN可以由 HA、 AAA代理或服务 器 ( AAA Proxy/Server ) 、 计费服务器、 互连网关设备等组成。 其中, 管理 W-CSN的运营商称为 NSP。
W-CSN主要提供如下的功能: 终端用户会话连接、 终端的 IP地址分配、 Internet接入、 AAA代理或服务器、 终端用户的策略及许可控制、 W-ASN与 W-CSN之间的隧道维护、 终端用户计费和结算、 W-CSN间的漫游、 W-CSN 间的移动性管理和 WiMAX业务。
其中:
R1接口是终端与接入网关之间的接口 (又称为参考点) 。
R2接口是终端与 W-CSN之间的逻辑接口。
R3接口是接入网关与 W-CSN之间的接口,在漫游时, R3接口是接入网 关与拜访 W-CSN之间的接口。
R4接口是接入网关之间的接口。
R5接口是漫游时拜访 W-CSN与归属 W-CSN之间的接口。
R6接口 ^^站与接入网关之间的接口。
R8接口是基站之间的接口。
现有 WiMAX系统中存在两种类型的切换: W-ASN锚定的切换和 W-CSN 锚定的切换; 其中,
W-ASN锚定的切换以包含锚定数据通道功能(DPF )的锚定接入网关为 锚点, 切换时终端从源基站切换到目标基站, 源锚定接入网关不变; 当目标 基站不是源锚定接入网关直接服务的对象时, 为目标基站服务的目标接入网 关和源锚定接入网关之间建立数据通道,通过该通道来转发终端的数据报文;
W-CSN锚定的切换以家乡代理为锚点, 当终端完成 W-ASN锚定的切换 后, 若锚定接入网关需要发生改变, 源锚定接入网关或目标接入网关发起 W-CSN锚定的切换, 切换完成后, 终端从源锚定接入网关接入变为从目标接 入网关接入, 源锚定接入网关与目标接入网关之间的数据通道会被删除, 而 锚点家乡代理并不发生变化; 此时, 目标接入网关的身份也转变为目标锚定 接入网关。 综上所述, 现有 WiMAX系统中的切换, 均需要固定锚点的支持来完成, 固定锚点的引入带来了数据包路径迂回的问题,加重了传输延时和带宽浪费。 将身份标识与位置分离技术应用到 WiMAX网络, 理论上可以支持 WiMAX 传统终端进行无固定锚点的移动性, 解决数据包路径迂回的问题, 而且还可 以达到解决 IP地址双重身份的目的,但是如何基于 WiMAX系统来实现无固 定锚点切换, 目前还没有相关的解决方案。 发明内容
本发明要解决的技术问题, 是提供一种实现无固定锚点切换的 WiMAX 系统及其切换方法, 以实现无固定描点切换, 减少了数据包的路径迂回, 降 低了传输延时和带宽浪费。
为解决以上技术问题, 本发明提供了一种 Wimax系统的无固定锚点的切 换方法, 包括:
终端完成 Wimax接入业务网络锚定的切换后, 源接入网关 (AGW)向目标 AGW发送 AGW切换请求;
该目标 AGW收到源 AGW切换请求后,为该终端分配指向本 AGW的新 的位置标识, 保存该终端身份标识与该新的位置标识的映射信息;
该目标 AGW发起位置标识注册流程, 更新该终端归属身份位置寄存器 (ILR)保存的该终端的位置标识; 且该终端归属 ILR收到更新通信对端的触发 消息后发起位置标识更新流程, 向该终端所有通信对端接入的网关发送位置 标识更新通知, 携带该终端的身份标识及新的位置标识; 以及
该目标 AGW向该源 AGW发送 AGW切换响应,完成所述无固定锚点的 切换, 该源 AGW释放为该终端分配的资源, 该终端和通信对端间的数据报 文经该目标 AGW转发。
其中, 所述 Wimax 系统的连接业务网络还包括身份位置核心路由器 (ILCR),各个 ILCR具有与广义转发平面之间的数据接口,所述广义转发平面 支持以位置标识为源地址和目的地址的数据报文的路由和转发;
所述方法还包括:该目标 AGW收到 AGW切换请求后,选择目标 ILCR, 在与该目标 ILCR 间还未建立该终端数据 "^文转发的隧道时建立该隧道; 切 换完成后, 源 ILCR释放为该终端分配的资源, 该终端和通信对端之间的报 文经该目标 AGW和该目标 ILCR转发。
其中, 各 Wimax接入业务网络中的 AGW与广义转发平面之间具有数据 接口, 该广义转发平面支持以位置标识为源地址和目的地址的数据报文的路 由和转发。
该方法还包括:
所述 Wimax系统中的 AGW根据接收的终端的数据报文获取并维护未更 新到终端归属 ILR的终端与通信对端的连接信息;
在切换过程中, 该源 AGW或目标 AGW通过通信对端信息通知请求实 时向该终端归属 ILR发送终端与通信对端的连接信息;
该终端归属 ILR收到目的 AGW发送的位置标识注册请求后, 根据收到 的终端和通信对端的连接信息发起位置标识更新流程, 并对所述连接信息进 行维护。
该方法还包括:
所述 Wimax系统中的 AGW根据接收的终端的数据报文获取并维护未更 新到终端归属 ILR的终端与通信对端的连接信息;
在所述无固定锚点切换过程中, 该源 AGW或目标 AGW通过通信对端 信息通知请求定时或定量向该终端归属 ILR发送终端与通信对端的连接信 息;
该源 AGW在收到该目的 AGW发送的切换响应后向该终端归属 ILR发 送通信对端信息传递请求, 其中携带该源 AGW未更新到终端归属 ILR的终 端与通信对端的连接信息; 以及
该目标 AGW发起位置标识注册流程时, 将目标 AGW未更新到终端归 属 ILR的终端与通信对端的连接信息发送给该终端归属 ILR;
该终端归属 ILR收到该源 AGW发送的通信对端信息传递请求或目的 AGW发送的位置标识注册请求中后到的请求后,根据收到的终端和通信对端 的连接信息发起位置标识更新流程, 并对所述连接信息进行维护。 该方法还包括:
所述 Wimax系统中的 AGW维护接入的终端的所有通信对端的身份标识 和位置标识映射信息;
在所述无固定锚点切换过程中, 该源 AGW或目的 AGW向该终端归属 ILR发送该终端所有通信对端的身份标识-位置标识映射信息; 维护通信对端 信息的目标 AGW通过以下方式获取通信对端身份标识-位置标识映射信息: 收到发送给切入终端的下行数据报文后, 获取报文中的通信对端信息身 份标识-位置标识映射信息; 或
根据数据报文中通信对端的身份标识在本地查询通信对端的身份标识- 位置标识映射信息; 或
从通信对端归属 ILR查询到通信对端的身份标识-位置标识映射信息; 或 从源 AGW查询得到通信对端的身份标识-位置标识映射信息。
其中, 所述通信对端信息包括终端与通信对端的连接信息, 该方法还包 括:
在所述 Wimax系统中, AGW根据接收的终端的数据报文获取并维护未 传递到终端归属 ILR的终端与通信对端的连接信息, 以及向终端归属 ILR传 递终端与通信对端的连接信息;
该终端归属 ILR发起位置标识更新流程时,根据通信对端身份标识 -位置 标识的映射信息、 本地配置信息或 DNS查询确定所述通信对端接入的网关, 向所述通信对端接入的网关发送位置标识更新通知, 携带该终端身份标识和 新的位置标识的映射信息; 以及
所述通信对端接入的网关收到位置标识更新通知后, 将保存的该终端的 身份标识-位置标识映射信息更新为该通知中携带的所述映射信息。
其中, 该目标 AGW和目标 ILCR之间的隧道是该目标 AGW选择目标 ILCR后, 通过隧道建立流程建立的该终端的动态隧道; 或者
该目标 AGW和目标 ILCR之间的隧道为两者上电后建立的静态隧道,目 标 ILCR根据目标 AGW的通知或通过检查数据报文获知有终端切换并获取该 终端的身份标识。 该方法还包括:
在所述无固定锚点切换过程中, 源 ILCR收到通信对端发送给该终端的 数据报文后转发给该源 AGW, 该源 AGW通过与该目标 AGW之间的转发隧 道将该数据报文转发到该目标 AGW,该目标 AGW再通过与该终端的数据通 道将该数据报文发送给该终端。
该方法还包括: 在所述无固定锚点切换过程中,
在该源 ILCR与目标 ILCR不同时, 在该两个 ILCR之间建立转发隧道, 该转发隧道在切换完成后释放;
在该两个 ILCR间的转发隧道建立之前,源 ILCR收到通信对端发给该终 端的数据报文后转发给该源 AGW , 该源 AGW转发到该目标 AGW , 该目标 AGW再通过与该终端间的数据通道将该数据报文发送给该终端; 以及
在该两个 ILCR间的转发隧道建立之后,源 ILCR收到通信对端发给该终 端的数据报文后通过该转发隧道转发到该目标 ILCR, 该目标 ILCR转发或緩 存后再转发到该目标 AGW,该目标 AGW再通过与该终端间的数据通道将该 数据报文发送给该终端。
该方法还包括, 在所述无固定锚点切换过程中,
该源 AGW将源 ILCR的标识信息发送到该目标 AGW, 该目标 AGW在 选择的目标 ILCR与该源 ILCR不同时, 将该源 ILCR的标识信息再发送到该 目标 ILCR, 该目标 ILCR建立到该源 ILCR的转发隧道; 或者
该目标 AGW选择目标 ILCR后, 将该目标 ILCR的标识信息发给该源 AGW, 该源 AGW在该目标 ILCR与源 ILCR不同时, 将该目标 ILCR的标识 信息再发送到该源 ILCR, 该源 ILCR建立到该目标 ILCR的转发隧道。
该方法还包括:
在所述无固定锚点切换过程中, 该目标 ILCR收到通信对端通过广义转 发平面发送给该终端的下行数据报文后,通过该目标 ILCR与目标 AGW之间 的该隧道将该数据报文转发给该目标 AGW,该目标 AGW对该数据报文解位 置标识封装后, 再通过与该终端的数据通道将该数据报文发送给该终端。
该方法还包括: 在所述无固定锚点切换过程中, 源 AGW收到通信对端发送给该终端的数据报文后,通过与该目标 AGW 之间的转发隧道将该数据报文转发到该目标 AGW,该目标 AGW再通过与该 终端之间的数据通道将该数据报文发送给该终端; 以及
该目标 AGW收到通信对端通过广义转发平面发送给该终端的下行数据 报文后, 通过与该终端的数据通道将该数据报文发送给该终端。
该方法还包括:
在所述无固定锚点切换过程中, 在该源 AGW向该目标 AGW发送 AGW 切换请求之前, 由该源 AGW对收到的该终端的下行数据报文进行解位置标 识封装; 在该源 AGW向该目标 AGW发送 AGW切换请求之后, 由该目标 AGW对该源 AGW转发来的该终端的下行数据报文进行解位置标识封装。
该方法还包括:
该终端归属 ILR完成所述位置标识更新流程之前, 若收到新的通信对端 信息, 则才艮据该新的通信对端信息确定该通信对端接入的网关, 并向该通信 对端接入的网关再次发送位置标识更新通知;
若通信对端归属 ILR中存在该终端身份标识-位置标识映射信息,则通信 对端接入的网关或该终端归属 ILR通知通信对端归属 ILR更新该终端身份标 识-位置标识映射信息。
其中, 在完成 Wimax接入业务网络锚定的切换后, 当该终端发送数据报 文到接入不同 ILCR的通信对端时, 该方法还包括:
在该目标 AGW与目标 ILCR建立动态隧道之前或该目标 AGW选择了与 本 AGW建立有静态隧道的目标 ILCR之前,该目标 AGW将收到的该终端发 送的该数据报文转发给该源 AGW,该源 AGW对该数据报文进行位置标识封 装和转发, 通过该源 ILCR和 /或映射转发平面转发到广义转发平面, 再经广 义转发平面送达该通信对端接入的网关;
在该目标 AGW与目标 ILCR建立动态隧道之后或该目标 AGW选择了与 本 AGW建立有静态隧道的目标 ILCR之后,该目标 AGW对该终端发送的上 行数据报文进行位置标识封装, 并通过以下任一路径发送该到通信对端接入 的网关: 通过与目标 ILCR之间的隧道转发到该目标 ILCR, 再经过映射转发平面 和 /或广义转发平面送达该通信对端接入的网关; 或
通过与源 AGW之间的隧道转发到源 AGW再转发到源 ILCR, 再经过映 射转发平面和 /或广义转发平面送达该通信对端接入的网关。
其中, 在完成 Wimax接入业务网络锚定的切换后, 当该终端发送数据报 文到接入不同 AGW的通信对端时, 该方法还包括:
该目标 AGW收到源 AGW发送的切换请求前, 将收到的该终端发送的 该数据报文转发给该源 AGW, 该源 AGW对该数据报文进行位置标识封装、 查询并转发到广义转发平面, 送达该通信对端接入的网关;
该目标 AGW收到源 AGW发送的切换请求后, 对该终端发送的数据报 文进行位置标识封装和查询后, 直接转发到广义转发平面; 或者先转发到该 源 AGW, 再经广义转发平面送达该通信对端接入的网关。
其中, 该目标 AGW选择目标 ILCR的步骤包括:
该目标 AGW直接或通过拜访 AAA服务器与该终端归属 AAA服务器交 互, 获取本目标 AGW可以连接的 ILCR的信息, 并从中选择一个 ILCR作为 目标 ILCR; 或者
该终端初始入网时, 终端归属 AAA服务器将该终端允许接入的 ILCR直 接或通过拜访 AAA服务器通知给该源 AGW, 源 AGW在所述无固定锚点切 换过程中将该终端允许接入的 ILCR通知给该目标 AGW, 目标 AGW从中选 择一个 ILCR作为目标 ILCR; 或者
目标 AGW根据自身的配置信息选择目标 ILCR。
其中, 所述 ILR与 AAA服务器合设, 表示为 AAA/ILR, 该 AAA/ILR保 存有归属终端的身份标识-位置标识映射信息; 该目标 AGW在为该终端分配 新的位置标识后, 通过向目标 ILCR发起隧道建立流程实现位置标识的注册; 该目标 AGW在隧道建立流程中将该终端的身份标识和新的位置标识带到该 目标 ILCR, 该目标 ILCR再利用到该终端归属 AAA/ILR的认证流程中将该 终端的身份标识和新的位置标识带到该终端归属 AAA/ILR, 该终端归属 AAA/ILR将保存的该终端的身份标识-位置标识映射信息中的位置标识更新 为收到的该新的位置标识。
其中,该源 AGW和源 ILCR释放的为该终端分配的资源至少包括: 该源 AGW与该目标 AGW之间的转发隧道, 该源 AGW和源 ILCR之间为该终端 建立的隧道, 及该源 AGW保存的该终端与通信对端的连接信息。
其中,该源 AGW向该目标 AGW发送的 AGW切换请求为锚定数据通道 功能 (DPF)切换请求;
该目标 AGW向该源 AGW发送的 AGW切换响应为锚定 DPF切换响应。 本发明还提供一种实现无固定锚点切换的 Wimax系统, 包括接入业务网 络和连接业务网络, 接入业务网络中包括基站和接入网关 (AGW), 所述连接 业务网络中包括身份位置寄存器(ILR ) ;
所述 AGW设置为: 在终端切入时, 为该终端分配新的位置标识并保存 该终端身份标识与该新的位置标识的映射信息, 向该终端归属 ILR注册该终 端的位置标识; 在终端切出后, 释放对该终端分配的资源; 以及对切入、 切 出终端的数据报文进行转发处理;
所述 ILR设置为: 注册更新终端的位置标识, 以及收到更新通信对端的 触发后向该终端所有通信对端接入的网关发送位置标识更新通知。
其中, 所述 AGW包括:
切出控制模块, 其设置为: 向目标 AGW发送 AGW切换请求, 切换完 成后, 释放为该终端分配的资源;
切入控制模块, 其设置为: 在收到 AGW切换请求后, 向位置标识分配 模块发送分配通知, 携带切入终端身份标识, 之后, 向位置标识注册模块发 送注册通知 , 并向源 AGW返回 AGW切换响应;
位置标识分配模块, 其设置为: 在收到分配通知后为该终端分配指向本 AGW的新的位置标识, 保存该终端身份标识与该新的位置标识的映射信息; 位置标识注册模块, 其设置为: 在收到注册通知后发起位置标识注册流 程,向终端归属身份位置寄存器 (ILR)发送位置标识注册请求,更新该终端 ILR 保存的该终端的位置标识;
连接信息维护模块, 其设置为: 向终端归属 ILR上报、 更新该终端与通 信对端连接信息, 以及维护未更新到终端归属 ILR的终端与通信对端的连接 信息; 以及
第一报文转发模块, 其设置为: 对切入终端的数据报文进行位置标识封 装、 解位置标识封装和转发, 及在收到要发送到切出终端的数据报文后向目 标侧转发; 以及从收到的终端的数据报文中解析出终端与通信对端的连接信 息, 并通知连接信息维护模块进行维护;
所述 ILR包括:
注册处理模块, 其设置为: 在收到 AGW发送的位置标识注册请求后, 注册更新终端的身份标识和位置标识的对应关系信息; 以及
位置标识更新模块, 其设置为: 根据收到的更新通信对端触发消息发起 位置标识更新流程, 收到更新通信对端的触发后向该终端所有通信对端接入 的网关发送位置标识更新通知, 携带该终端的身份标识及新的位置标识。
其中, 所述连接业务网络还包括身份位置核心路由器 (ILCR), 各 ILCR 与广义转发平面之间具有数据接口; 所述广义转发平面支持以位置标识为源 地址和目的地址的数据报文的路由和转发; 所述 ILCR 包括第二报文转发模 块, 其设置为: 路由和转发以位置标识为源地址和目的地址的数据报文; 所述 AGW还包括第一隧道建立模块; 所述 AGW的切入控制模块还设 置为: 在收到 AGW切换请求后选择目标 ILCR, 向该隧道建立模块发送隧道 建立通知; 所述第一隧道建立模块设置为: 在收到隧道建立通知后, 为切入 终端建立与该目标 ILCR间的动态隧道; 或者
所述 AGW还包括第一隧道建立模块, 所述第一隧道建立模块设置为: 在上电后建立与 ILCR间的静态隧道。
其中, 各 AGW与广义转发平面之间具有数据接口, 该广义转发平面支 持以位置标识为源地址和目的地址的数据 ^艮文的路由和转发。
其中, 所述连接信息维护模块实时向终端归属 ILR上 ·¾、 更新该终端和 通信对端的连接信息; 触发该 ILR的位置标识更新模块发起位置标识更新流 程的更新通信对端触发消息指 AGW发送的位置标识注册请求。
其中,所述连接信息维护模块是设置为定时或定量向终端归属 ILR上报、 更新该终端和通信对端的连接信息;
所述切出控制模块还设置为: 在收到该目的 AGW发送的切换响应后向 终端归属 ILR发送通信对端信息传递请求, 其中携带该连接信息维护模块还 未更新到终端归属 ILR的终端与通信对端的连接信息, 并通知该连接信息维 护模块停止对切出终端的连接信息的维护;
所述位置标识注册模块发送的位置标识注册请求中携带该连接信息维护 模块还未更新到终端归属 ILR的终端与通信对端的连接信息;
所述更新通信对端触发消息指通信对端信息传递请求和位置标识注册请 求中后到的请求。
其中, 所述 AGW还包括映射信息维护模块, 其设置为: 向终端归属 ILR 上报、 更新该终端的通信对端的身份标识-位置标识映射信息, 以及维护未更 新到终端归属 ILR的该终端的通信对端的身份标识-位置标识映射信息; 以及 通过以下方式获取通信对端的身份标识-位置标识映射信息:
根据收到的发送给终端的下行数据报文解析获得; 或
根据数据报文中通信对端的身份标识在本地查询通信对端的身份标识- 位置标识映射信息; 或
从通信对端归属 ILR查询到通信对端的身份标识-位置标识映射信息; 或 从源 AGW或源 ILCR查询得到通信对端的身份标识 -位置标识映射信息。 其中, 所述 ILR的位置标识更新模块是设置为: 在发起位置标识更新流 程时, 根据通信对端身份标识-位置标识的映射信息、 本地配置信息或 DNS 查询确定所述通信对端接入的网关, 向所述通信对端接入的网关发送位置标 识更新通知, 携带该终端身份标识和新的位置标识的映射信息。
其中, 所述 AGW中的第一报文转发模块是设置为: 收到发给切出终端 的下行数据报文后, 通过与目标 AGW之间的转发隧道转发到该目标 AGW, 收到发给切入终端的下行数据报文时, 通过与该终端的数据通道发送给该终 端。
其中, 所述 ILCR还包括第二隧道建立模块, 其设置为: 为切入终端建 立与源 ILCR间的转发隧道, 或为切出终端建立与目标 ILCR间的转发隧道, 并在切换完成后释放该转发隧道;
在所述无固定锚点切换过程中, 所述 ILCR 中的第二报文转发模块是设 置为:对收到的发给切出终端的数据报文先转发给源 AGW,在源、 目标 ILCR 间的转发隧道建立后则通过该转发隧道转发到该目标 ILCR;对收到的发给切 入终端的数据报文, 通过与目标 AGW间的隧道转发给该目标 AGW。
其中, 所述切出控制模块还设置为: 将源 ILCR的标识信息发送到目标 AGW; 所述切入控制模块还设置为: 在选择的目标 ILCR与该源 ILCR不同 时, 将源 ILCR的标识信息发送到目标 ILCR; 所述 ILCR的第二隧道建立模 块是设置为: 根据收到的源 ILCR的标识信息建立到该源 ILCR的转发隧道; 或者
所述切入控制模块还设置为: 将目标 ILCR的标识信息发给源 AGW; 所 述切出控制模块还设置为: 将收到的目标 ILCR与源 ILCR不同时, 将该目标 ILCR的标识信息发送到源 ILCR; 所述 ILCR中的第二隧道建立模块是设置 为: 根据收到的目标 ILCR的标识信息建立到该目标 ILCR的转发隧道。
其中, 所述切出控制模块还设置为: 向目标 AGW发送切换请求时, 向 本 AGW中的报文转发模块发送第一通知;
所述切入控制模块还设置为: 收到源 AGW发来切换请求时, 向本 AGW 中的报文转发模块发送第二通知;
所述 AGW中的第一报文转发模块是设置为: 在收到所述第一通知之前, 对收到的切出终端的下行数据报文进行解位置标识封装后再转发到目标 AGW, 收到所述第一通知之后则直接转发到目标 AGW; 在收到所述第二通 知之前, 对源 AGW转发来的切入终端的下行数据报文直接发送到终端, 收 到所述第二通知之后在进行解位置标识封装后再发送到终端; 对目标 ILCR 转发来的切入终端的下行数据 文均进行解位置标识封装, 再通过与该终端 的数据通道发送给该终端。
其中, 所述 AGW的第一报文转发模块将收到的切出终端的上行数据报 文转发到源 ILCR,在收到所述第一通知之前还对该上行数据报文进行位置标 识封装; 对收到的切入终端发送的上行数据报文, 如与目标 ILCR 间的隧道 未建立,将该上行数据报文转发到源 AGW,在收到所述第二通知之后还对该 上行数据报文进行位置标识封装, 如与目标 ILCR 间的隧道已建立, 对该上 行数据报文进行位置标识封装后通过与目标 ILCR之间的隧道转发到该目标 ILCR或通过与源 AGW之间的隧道转发到源 AGW。
其中, 所述 AGW具有到广义转发平面的数据接口; 所述 AGW中的报 文转发模块是设置为: 将收到的切出终端的上行数据报文进行位置标识封装 后转发到广义转发平面; 在收到所述第二通知之前, 将收到的切入终端发送 的上行数据报文直接转发到源 AGW,在收到所述第二通知之后,对该上行数 据报文进行位置标识封装后转发到广义转发平面。
其中, 所述切入控制模块是设置为以如下方式选择目标 ILCR:
所述切入控制模块与切入终端归属的 AAA服务器交互, 获取本目标 AGW可以连接的 ILCR的信息, 从中选择一个 ILCR作为目标 ILCR; 或者 所述切入控制模块从源 AGW发来的切入终端允许接入的 ILCR中选择一 个 ILCR作为目标 ILCR,所述允许接入的 ILCR是该切入终端归属的 AAA服 务器发送到源 AGW的; 或者
所述切入控制模块根据本 AGW的配置信息选择目标 ILCR。
其中, 所述切出控制模块向目标 AGW发送的 AGW切换请求为锚定数 据通道功能 (DPF)切换请求; 所述切入控制模块向源 AGW发送的 AGW切换 响应为锚定 DPF切换响应。
本发明 Wimax系统的无固定锚点的切换方法和 Wimax系统的将身份标 识和位置分离的移动通信网络应用到 WiMAX网络,当终端发生移动切换时, 由终端归属身份位置寄存器(ILR )在收到更新通信对端的触发消息后, 通知 通信对端接入的网关 (AGW、 ILCR或其他的网关如边界网关) 更新终端 AID-RID映射信息,从而实现无固定锚点的切换, 减少了数据包的路径迂回, 降低了传输延时和带宽浪费, 而且还可以达到解决 IP地址双重身份的目的。 附图概述 附图说明用来提供对本发明的进一步理解, 并且构成说明书的一部分, 与本发明的实施例一起用于解释本发明, 并不构成对本发明的限制。
图 1是基于身份标识和位置分离架构的网络拓朴示意图。
图 2是基于身份标识和位置分离架构的网络与 Legecy IP网络(传统 IP 网络) 的拓朴关系的示意图。
图 3是现有 WiMAX网络架构示意图。
图 4a是身份标识和位置分离 WiMAX网络架构示意图一。
图 4b是身份标识和位置分离 WiMAX网络架构示意图二。
图 5是本发明实现无固定锚点切换的切换方法的实施例一的流程图。 图 6是本发明实现无固定锚点切换的切换方法的实施例二的流程图。 图 7是本发明实现无固定锚点切换的切换方法的实施例三的流程图。 图 8是本发明实现无固定锚点切换的切换方法的实施例四的流程图。 图 9是本发明实现无固定锚点切换的切换方法的实施例五的流程图。 图 10是本发明实现无固定锚点切换的切换方法的实施例六的流程图。 图 11是本发明实现无固定锚点切换的切换方法的实施例七的流程图。 图 12是本发明实现无固定锚点切换的切换方法的实施例八的流程图。 图 13是本发明实现无固定锚点切换的切换方法的实施例九的流程图。 图 14是本发明实现无固定锚点切换的切换方法的实施例十的流程图。 图 15是本发明实现无固定锚点切换的切换方法的实施例十一的流程图。 图 16是本发明 AGW或 ILCR向 ILR上报、 更新通信对端信息流程图。 本发明的较佳实施方式
本发明 Wimax系统的无固定锚点的切换方法和 Wimax系统的主要思想 是, 将身份标识和位置分离的移动通信网络应用到 WiMAX网络, 当终端发 生移动切换时, 由终端归属身份位置寄存器(ILR )在收到更新通信对端的触 发消息后, 通知通信对端接入的网关 (AGW、 ILCR或其他的网关如边界网 关)更新终端 AID-RID映射信息, 从而实现无固定锚点的切换, 减少了数据 包的路径迂回, 降低了传输延时和带宽浪费, 而且还可以达到解决 IP地址双 重身份的目的。
图 2 所示是一种身份标识和位置分离 (SILSN: Subscriber Identifier & Locator Separation Network )架构, 该 SILSN架构的网络拓朴划分为拓朴关系 上没有重叠的接入网和骨干网, 接入网位于骨干网的边缘, 负责所有终端的 接入, 骨干网负责接入的终端间数据报文的路由和转发。
SILSN架构的网络中有两种标识类型:接入标识( AID: Access Identifier ) 和路由标识(RID: Routing Identifier ) 。 其中, AID是终端的用户身份标识, 网络为每个终端用户分配一个 AID, 在终端移动过程中始终保持不变; RID 是网络为终端分配的位置标识, 在骨干网使用。 应说明的是, 身份标识和位 置标识在不同的 SILSN架构可以有不同的名称, 但实质是一样的。 用户签约 成为本架构网络用户后, 可以在该用户归属认证中心及归属 ILR中进行开户 放号操作, 认证中心及 ILR记录该用户的属性数据, 包括为该用户分配的 AID。 完成开户放号的处理后, AID被静态分配给该用户, 在该用户有效合 法存续期间, 该用户的 AID不变。
SILSN架构中, 终端可以是移动终端、 固定终端和游牧终端中的一种或 多种, 如手机、 固定电话、 电脑和服务器等等。
SILSN架构中, 接入网用于为终端提供二层(物理层和链路层)接入手 段, 维护终端与 ASN之间的物理接入链路。 可能的二层接入手段包括: 蜂窝 移动网技术(GSM/CDMA/ TD-SCDMA/WCDMA/ Wimax/LTE ) 、 DSL、 宽 带光纤接入或 WiFi接入等等。
SILSN架构中, 接入服务节点用于为终端提供接入服务、 维护终端与网 络的连接, 为终端分配 RID, 维护 AID-RID映射信息, 到映射转发平面登记 注册和查询终端的 RID, 以及实现数据报文的路由和转发等功能。
SILSN架构中, 骨干网的主要网元包括:
接入服务节点 (ASN: Access Service Node)用于为终端分配 RID, 维护终 端的 AID-RID映射信息, 到 ILR登记注册和查询终端的 RID, 以及实现数据 报文的路由和转发, 终端须经过 ASN接入骨干网。 ASN分配的 RID包含该 ASN的地址信息, 将该 RID作为数据报文的目的地址时, 该数据报文将被路 由到该 ASN。
通用路由器( CR: Common Router ) , 用于根据数据报文中的 RID进行 选路, 转发以 RID为目的地址的数据 ^艮文。
身份位置寄存器( ILR: Identity Location Register ) , ILR用于保存终端的 身份标识和位置标识映射信息, 文中也写为 AID-RID映射信息, 处理对终端 位置的注册、 注销和查询;
可选地, 骨干网还可以包括:
分组转发功能(PTF: Packet Transfer Function ) , 也称为分组转发功能 节点, 用于路由和转发以 AID为目的地址的数据报文。
互联服务节点 (ISN),具有与通用路由器、 ASN和 ILR的接口,用于查询、 维护本网络终端的 AID-RID 映射信息, 封装、 路由和转发本网络与传统 IP 网络之间往来的数据 ^艮文, 实现两个网络的互联互通。
上述 ILR, 或 ILR和 PTF构成了骨干网的映射转发平面, CR, 或 CR和 ISN构成了骨干网的广义转发平面。 骨干网中还可以包括认证中心等其他网 元。
SILSN架构初期可以传统 IP网络的一个或多个孤岛形式存在和发展, 或 作为传统 IP网络的扩展部分。 SILSN架构与传统 IP网络的拓朴关系如图 3 所示, SILSN架构的骨干网部分与传统 IP处于同一平面, 通过 ISN与传统 IP 网络互通。 SILSN架构具备独立组网的能力, 可以形成脱离传统 IP网络独自 发展的网络, 在该阶段, 功能实体 ISN将不再存在。
本发明将上述 SILSN架构应用于 WiMAX系统,来实现无固定锚点切换。 根据背景技术记载的 SILSN 架构及其工作原理可以了解, 终端移动发生跨 ASN的切换时, 切入一侧的目标 ASN要为终端分配 RID, 向该终端归属 ILR 发起注册; 切出一侧的源 ASN要删除该终端的 AID-RID映射信息, 并维护 该终端所有通信对端的 AID-RID映射信息。 为了使通信对端发送给该终端的 报文能够迅速路由到目标 ASN,需要向通信对端接入的网关发送 RID更新通 知。 在切换过程中, 源 ASN需要向目标 ASN转发通信对端发送给该终端的 报文。
下文主要针对为实现无固定锚点切换而在原有系统上进行的改进加以描 述, 包括相关的功能和流程。 文中, 将终端的通信对端接入的网元简称为对 端网元; 为了表述方便, 在表述某个网元的功能时, 将接入到该网元的用户 终端称为终端, 与接入该网元的用户终端通信的用户终端称为通信对端。 此 外, 因为本发明实现的是无固定锚点切换, 故将原切换流程中的源锚定接入 网关统称为源接入网关, 目标锚定接入网关统称为目标接入网关。
图 4a、 图 4b是将上述身份标识和位置分离技术应用于 WiMAX网络后 的系统。
为了表述方便, 在表述某个网元的功能时, 将接入到该网元的用户终端 称为终端, 与接入该网元的用户终端通信的称为通信对端。
在本发明中, 通信对端信息包括以下一种或多种: 终端与通信对端的连 接信息 (即终端 AID与通信对端 AID的映射 ) , 通信对端 AID-RID映射信 息。
下面结合附图和具体实施例对本发明所述技术方案作进一步的详细描 述, 以使本领域的技术人员可以更好的理解本发明并能予以实施, 但所举实 施例不作为对本发明的限定。
系统一
图 4a是应用上述身份标识和位置分离技术的一种 Wimax系统的网络架 构的示意图,图中实线表示承载面的连接,虚线表示控制面的连接。该 Wimax 网络架构包括接入业务网络 (W-ASN)和连接业务网络 (W-CSN)。 连接业务网 络具有到广义转发平面的数据面接口, 表示为 D接口。 广义转发平面可以是 支持按 RID路由和转发数据报文的分组数据网络, 其他实施例同。
在 W-CSN中,具有认证授权计费 (AAA)代理或服务器 (AAA Proxy/Server) 等原有网元, 还设置了身份位置核心路由器(Identity Location Core Route, 简 称 ILCR ) 、 身份位置寄存器(ILR )和分组转发功能 (PTF), ILR和 PTF可以 合设,表示为 ILR/PTF,各 W-CSN中的 ILR/PTF构成了映射转发平面。其中, ILCR集合了 HA和 /或 W-CR(Wimax核心路由器)的功能, 并具有实现身份标 识和位置分离所需的新功能。
W-ASN中包括基站和接入网关, 其中的接入网关在 Wimax架构中的接 入网关所具有的功能实体(如锚定数据通道功能( Anchor DPF )、 鉴权器等) 的基础上, 扩展了实现身份标识和位置分离所需的新功能。
本系统中; 接入网关 (AGW)位于 WiMAX接入业务网络( W-ASN ) 中, 用于为终端分配 RID, 向 ILR注册和注销终端的 RID, 向 ILR查询通信对端 的 RID, 维护未更新到 ILR的终端与通信对端的连接信息, 维护终端和通信 对端 AID-RID映射信息, 向终端归属 ILR上 ^艮、 更新通信对端信息, 对数据 报文进行 RID封装和解封装, 以及根据 RID实现数据报文的路由和转发。
身份位置核心路由器 (ILCR)位于 W-CSN中, 用于路由和转发以 RID为 源地址和目的地址的数据报文, 该功能与现有技术中的路由器相似;
ILR, 位于 W-CSN中, 用于接收所述 AGW对本 ILR归属用户终端的注 册和注销请求, 维护归属用户终端的 AID-RID 映射信息, 以及接收对终端 RID的查询请求, 将请求中该终端 AID对应的 RID返回给查询请求方, 以及 收到更新通信对端的触发消息后向该终端所有通信对端接入的网关发送 RID 更新通知。
与切换相关的, (以下不特别指出的, 对应于实施例一至三) :
AGW用于在终端切入时 , 为该终端分配新的位置标识 (RID)并保存该终 端身份标识 (AID)与该新的 RID的映射信息,向该终端归属 ILR注册该终端的 RID; 在终端切出后, 释放对该终端分配的资源; 以及对切入、 切出终端的 数据报文进行转发处理;
ILR, 位于 W-CSN中, 用于注册、 注销、 查询终端的 RID, 以及收到更 新通信对端的触发消息后向该终端所有通信对端接入的网关发送 RID更新通 知。
具体地, AGW包括: 切出控制模块, 用于向目标 AGW发送 AGW切换请求, 切换完成后, 释放为该终端分配的资源;
切入控制模块, 用于在收到 AGW切换请求后, 向位置标识 (RID)分配模 块发送分配通知,携带切入终端 AID,之后, 向 RID注册模块发送注册通知, 并向源 AGW返回 AGW切换响应;还用于在收到 AGW切换请求后选择目标 ILCR, 向该隧道建立模块发送隧道建立通知;
所述切出控制模块向目标 AGW发送的 AGW切换请求为锚定数据通道 功能 (DPF)切换请求; 所述切入控制模块向源 AGW发送的 AGW切换响应为 锚定 DPF切换响应。
RID分配模块, 用于在收到分配通知后为该终端分配指向本 AGW的新 的 RID, 保存该终端 AID与该新的 RID的映射信息;
RID注册模块, 用于在收到注册通知后发起 RID注册流程, 向终端归属 身份位置寄存器 (ILR)发送 RID注册请求,更新该终端归属 ILR保存的该终端 的 RID;
连接信息维护模块, 用于向终端归属 ILR上报、 更新该终端与通信对端 连接信息, 以及维护未更新到终端归属 ILR的终端与通信对端的连接信息, 该终端与通信对端的连接信息包含该终端 AID与所有通信对端 AID的对应关 系信息;
报文转发模块, 用于对切入终端的数据报文进行 RID封装、 解 RID封装 和转发及在收到要发送到切出终端的数据报文后向目标侧转发, 还用于从收 到的终端的数据报文中解析出终端与通信对端的连接信息, 并通知连接信息 维护模块进行维护;
本发明所说的终端的数据报文包括发送到终端的下行数据报文以及终端 发送的上行数据报文。
隧道建立模块, 用于在收到隧道建立通知后, 为切入终端建立与该目标 ILCR间的动态隧道;
所述 ILR包括: 注册处理模块, 用于在收到 AGW发送的 RID注册请求后, 注册更新终 端的 AID和 RID的对应关系信息;
RID更新模块, 用于根据收到的更新通信对端触发消息发起 RID更新流 程 ,向该终端所有通信对端接入的网关发送 RID更新通知 ,携带该终端的 AID 及新的 RID, 具体地, 在发起 RID更新流程时, 根据通信对端 AID-RID的映 射信息、 本地配置信息或 DNS查询确定所述通信对端接入的网关, 向所述通 信对端接入的网关发送 RID更新通知,携带该终端 AID和新的 RID的映射信 息。
所述 ILCR包括报文转发模块, 用于路由和转发以 RID为源地址和目的 地址的数据报文。
进一步地,
所述连接信息维护模块实时向终端归属 ILR上 ·¾、 更新该终端和通信对 端的连接信息;触发该 ILR的 RID更新模块发起 RID更新流程的更新通信对 端触发消息指 AGW发送的 RID注册请求。
进一步地,
所述连接信息维护模块定时或定量向终端归属 ILR上报、 更新该终端和 通信对端的连接信息;
切出控制模块, 还用于在收到该目的 AGW发送的切换响应后向终端归 属 ILR发送通信对端信息传递请求, 其中携带该连接信息维护模块还未更新 到终端归属 ILR的终端与通信对端的连接信息, 并通知该连接信息维护模块 停止对切出终端的连接信息的维护;
所述 RID注册模块发送的 RID注册请求中携带该连接信息维护模块还未 更新到终端归属 ILR的终端与通信对端的连接信息;
触发该 ILR的 RID更新模块发起 RID更新流程的更新通信对端触发消息 指后到的通信对端信息传递请求或 RID注册请求。
进一步地,
所述 AGW还包括映射信息维护模块, 用于向终端归属 ILR上报、 更新 该终端的通信对端的 AID-RID映射信息, 以及维护未更新到终端归属 ILR的 该终端的通信对端的 AID-RID映射信息。
所述 AGW的映射信息维护模块通过以下方式获取通信对端的 AID-RID 映射信息:
根据收到的发送给终端的下行数据报文解析获得; 或
根据数据报文中通信对端的 AID在本地查询通信对端的 AID-RID映射信 息; 或
从通信对端归属 ILR查询到通信对端的 AID-RID映射信息; 或 从源 AGW或源 ILCR查询得到通信对端的 AID-RID映射信息。
进一步地, (对应实施例一)
所述 AGW中的报文转发模块收到发给切出终端的下行数据报文后, 通 过与目标 AGW之间的转发隧道转发到该目标 AGW,收到发给切入终端的下 行数据报文时, 通过与该终端的数据通道发送给该终端。
进一步地, (对应实施例二、 三)
所述 ILCR还包括隧道建立模块,用于为切入终端建立与源 ILCR间的转 发隧道, 或为切出终端建立与目标 ILCR 间的转发隧道, 并在切换完成后释 放该转发隧道;
所述 ILCR 中的报文转发模块在切换过程中, 对收到的发给切出终端的 数据报文先转发给源 AGW, 在源、 目标 ILCR间的转发隧道建立后则通过该 转发隧道转发到该目标 ILCR; 对收到的发给切入终端的数据报文, 通过与目 标 AGW间的隧道转发给该目标 AGW。
系统一建立 ILCR间隧道的方式有以下两种: (对应实施例二)
一、 (对应实施例二)所述切出控制模块还用于将源 ILCR的标识信息 发送到目标 AGW;所述切入控制模块还用于在选择的目标 ILCR与该源 ILCR 不同时, 将源 ILCR的标识信息发送到目标 ILCR; 所述 ILCR中的隧道建立 模块用于根据收到的源 ILCR的标识信息建立到该源 ILCR的转发隧道; 二、 (对应实施例三)所述切入控制模块还用于将目标 ILCR的标识信 息发给源 AGW; 所述切出控制模块还用于将收到的目标 ILCR与源 ILCR不 同时, 将该目标 ILCR的标识信息发送到源 ILCR; 所述 ILCR中的隧道建立 模块用于根据收到的目标 ILCR的标识信息建立到该目标 ILCR的转发隧道。
进一步地,
所述切出控制模块向目标 AGW发送切换请求时, 向本 AGW中的报文 转发模块发送第一通知;
所述切入控制模块收到源 AGW发来切换请求时, 向本 AGW中的报文 转发模块发送第二通知;
所述 AGW中的报文转发模块在收到所述第一通知之前, 对收到的切出 终端的下行数据报文进行解 RID封装后再转发到目标 AGW, 收到所述第一 通知之后则直接转发到目标 AGW; 在收到所述第二通知之前, 对源 AGW转 发来的切入终端的下行数据报文直接发送到终端, 收到所述第二通知之后在 进行解 RID封装后再发送到终端; 对目标 ILCR转发来的切入终端的下行数 据报文均进行解 RID封装, 再通过与该终端的数据通道发送给该终端。
进一步地,
所述 AGW中的报文转发模块将收到的切出终端的上行数据报文转发到 源 ILCR, 在收到所述第一通知之前还对该上行数据报文进行 RID封装; 对 收到的切入终端发送的上行数据 文, 如与目标 ILCR 间的隧道未建立, 将 该上行数据报文转发到源 AGW,在收到所述第二通知之后还对该上行数据报 文进行 RID封装, 如与目标 ILCR间的隧道已建立, 对该上行数据报文进行 RID封装后通过与目标 ILCR之间的隧道转发到该目标 ILCR或通过与源 AGW之间的隧道转发到源 AGW。
进一步地,
对应于本发明所有实施例, 所述切入控制模块选择目标 ILCR的方式为 以下方式中的一种:
方式一、所述切入控制模块与切入终端归属的 AAA服务器交互,获取本 目标 AGW可以连接的 ILCR的信息, 从中选择一个 ILCR作为目标 ILCR;
方式二、所述切入控制模块从源 AGW发来的切入终端允许接入的 ILCR 中选择一个 ILCR作为目标 ILCR, 所述允许接入的 ILCR是该切入终端归属 的 AAA服务器发送到源 AGW的;
方式三、 所述切入控制模块根据本 AGW的配置信息选择目标 ILCR。
以下实施例一至实施例三都^^于以上系统一实现终端无固定锚点切换 的。 下面将结合附图及对各实施例进行更详细的说明。
实施例一
图 5 于系统一实现终端无固定锚点切换的第一种流程图, 在切换过 程中使用 AGW之间的转发隧道进行数据转发的场景, 其具体步骤描述如下: 步骤 501 , 当处于连接态的终端移动并完成 W-ASN锚定的切换后, 终端 从源基站接入切换为从目标基站接入, 且源 AGW与目标 AGW之间建立了 数据通道;
除特别指出外, 流程中提到的终端指发生切换的该终端, 其他实施例同。 终端可以按现有标准来完成 W-ASN锚定的切换。 源 AGW与目标 AGW 之间建立了数据通道后, 终端上下行数据报文路径如 D501、 D502所示:
D501 , 下行数据报文路径:
源 ILCR收到通信对端发给终端的数据报文后,转发给源 AGW,源 AGW 剥去该数据报文中封装的 RID, 恢复为通信对端发送的数据报文的格式后, 通过源 AGW与目标 AGW之间的数据通道将数据报文转发给目标 AGW, 目 标接入网关再将该报文通过与终端数据通道发往该终端。
D502, 上行数据报文路径:
终端发送上行数据文给目标基站, 目标基站将数据报文转发给目标 AGW, 目标 AGW通过源 AGW与目标 AGW之间的数据通道将数据报文转 发给源 AGW, 源 AGW对数据报文进行 RID封装和转发, 经该源 ILCR和 / 或映射转发平面转发到广义转发平面, 再经广义转发平面送达对端接入的网 关, 如 AGW, ILCR, 也可以是其他的网关如边界网关。
文中 ,某个网元对数据报文进行 RID封装和转发与背景技术中 ASN对数 据报文进行 RID封装和转发是相似的, 具体是: 该网元根据通信对端的 AID 从本地緩存的 AID-RID映射信息中查找通信对端的 RID, 如查找到, 将该终 端和通信对端的 RID分别作为源、 目的地址封装在数据报文中, 直接转发到 广义转发平面 (该网元为 ILCR时, 或没有 ILCR时)或转发到源 ILCR后再 由源 ILCR转发到广义转发平面(该网元为 AGW时); 如没有查找到, 则该 网元将该终端的 RID作为源地址封装在数据报文中, 转发到映射转发平面或 经源 ILCR转发到映射转发平面,同时向 ILR查询到通信对端的 RID并緩存。 在没有查找到通信对端的 RID时, 还可以釆用另一种 RID封装和转发方式: 先将数据报文緩存到本地, 再从 ILR查询到通信对端的 RID并緩存, 然后再 将该终端和通信对端的 RID分别作为源、 目的地址封装在数据报文中, 直接 转发到广义转发平面或转发到源 ILCR后再由源 ILCR转发到广义转发平面。
各实施例所描述的上、 下行数据报文路径均是针对终端和通信对端接入 不同的 AGW (不存在 ILCR时 )或 ILCR时的情况, 若终端和通信对端接入 相同的 AGW (不存在 AGW时 )或 ILCR, AGW或 ILCR可以不进行 RID的 封装和 /或查询 RID, 直接由本 AGW或 ILCR转发到通信对端, 转发时也不 需要剥去 RID的封装。当然 AGW或 ILCR也可以不判断是否接入相同的 AGW 或 ILCR, 均釆用上述接入不同 AGW或 ILCR时的方式进行封装、 路由和转 发。 其他实施例同此。
另外, 文中两个网元之间通过隧道转发数据时包括了隧道封装和解封装 的处理, 文中也不再——说明。
在数据报文发送过程中, 源 AGW对终端与通信对端的连接信息进行维 护, 如可以根据流实时检测机制更新该连接信息 (如删除确定为离线的通信 对端的 AID ) , 可以检查数据报文, 将数据报文中新的通信对端的 AID、 RID 添加到连接信息中, 及保存向 ILR查询到的通信对端的 RID等。
在数据报文收发过程中, 源 AGW向终端归属 ILR上报、 更新通信对端 信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 502, 当目标 AGW准备发起 AGW重定位时, 向源 AGW发送锚定 DPF切换触发消息, 此步骤可选; 步骤 503 , 源 AGW向目标 AGW发送锚定 DPF切换请求;
源 AGW可以在收到目标 AGW锚定 DPF切换触发消息并同意进行锚定 DPF切换后,发送锚定 DPF切换请求。也可以是源 AGW决定发起锚定 AGW 重定位时发送锚定 DPF切换请求。
此后, 终端上下行数据报文路径仍然如 D501、 D502所示。 只是此时由 目标 AGW对数据报文进行封装和解封装。
在数据报文发送过程中, 目标 AGW向终端归属 ILR上报、 更新通信对 端信息, 并可选的维护、 更新本地保存的通信对端信息。 可能存在对于同一 个通信对端 , 源 AGW已经更新了 ILR, 目标 AGW又再次更新 ILR, 此时, ILR覆盖原先数据或者不处理, 系统一其他实施例中出现此情况, 也做同样 的处理, 后续不再详述。
步骤 504, 目标 AGW为该终端分配新的 RID, 并在本地保存更新该终端 AID-RID映射信息;
步骤 505 , 目标 AGW选择目标 ILCR, 并向目标 ILCR发起隧道建立流 程, 建立与目标 ILCR之间的隧道;
在目标 AGW与目标 ILCR之间的隧道建立过程中, 目标 AGW将该终端 的 AID发送到目标 ILCR, 文中的动态隧道均是为切换的该终端建立的, 其 他实施例同此。目标 ILCR还可能需要与归属 AAA服务器进行交互完成认证。
文中, AGW与 ILCR之间, ILCR与 ILCR之间的隧道均可以有多种方式, 如 L2TPv3、 IP-in-IP, MPLS(LDP-based和 RSVP-TE based)、 GRE、 MIP和 IPsec等, 本发明不局限于任何一种特定的方式。 当釆用 MIP, 隧道的创建、 维护与现有 WiMAX网络相同。
此后, 终端上下行数据报文路径如 D503、 D504所示:
D503 , 下行数据报文路径: 源 ILCR收到通信对端发给终端数据报文后, 转发给源 AGW, 源 AGW通过源 AGW与目标 AGW之间的数据通道将数据 报文转发给目标 AGW, 目标 AGW剥去该数据报文中封装的 RID, 恢复为通 信对端发送的数据报文的格式后, 目标接入网关在将该报文通过与终端数据 通道发往该终端。
D504, 上行数据报文路径: 终端发送上行数据文给目标基站, 目标基站 将数据报文转发给目标 AGW, 目标 AGW对数据报文进行 RID封装和转发, 经目标 ILCR和 /或映射转发平面转发到广义转发平面, 再经广义转发平面送 达对端接入的网关。
在数据报文发送过程中, 目标 AGW向终端归属 ILR上报、 更新通信对 端信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 506 , 目标 AGW在分配新的 RID后 , 向终端归属 ILR发起 RID注 册流程,通过 RID注册请求将该终端的 AID和新的 RID的映射信息发送到该 ILR;
若本地保存的通信对端信息中还有未上 "^终端归属 ILR的信息, 则将未 上报的信息携带在消息中上报终端归属 ILR, 该 ILR保存收到的通信对端的 信息。 若终端归属 ILR中保存了通信对端 AID-RID映射信息, 则目标 AGW 在本步骤中上 ^艮给终端归属 ILR的通信对端信息中包括终端与通信对端的连 接信息, 通信对端 AID-RID映射信息; 否则, 只需要上报终端与通信对端的 连接信息。
步骤 507 , 归属 ILR收到目标 AGW的 RID注册请求后, 验证 AID的合 法性, 并保存终端当前 AID-RID的映射信息;
在另一实施方式中, AAA服务器可能与 ILR合设, 表示为 AAA/ILR。 此 时, 目标 AGW可以在为终端分配新的 RID后, 将步骤 506和步骤 507的注 册流程与步骤 505目标 ILCR发起的隧道建立流程结合, 将该终端 AID和新 的 RID带到目标 ILCR, 该目标 ILCR再利用到终端归属 AAA/ILR的认证流 程将该终端 AID的新的 RID带到该终端归属 AAA/ILR,该终端归属 AAA/ILR 将保存的该终端的 RID更新为收到的该新的 RID。 其他实施例也可以做此变 化。
此后, 终端上下行数据^艮文路径如 D505、 D506所示:
D505, 下行数据报文路径: 目标 ILCR收到通信对端发给终端数据报文 后, 转发给目标 AGW, 目标 AGW剥去该数据报文中封装的 RID, 恢复为通 信对端发送的数据报文的格式后, 目标 AGW在将该报文通过与终端数据通 道发往该终端。
D506, 上行数据报文路径: 同 D504。
在数据报文发送过程中, 目标 AGW向终端归属 ILR上报、 更新通信对 端信息, 并可选的维护、 更新本地保存的通信对端信息。
此时, 还会存在由源 ILCR转发的数据报文, 这是由于还未通知通信对 端接入的网关未更新终端 AID-RID映射信息导致的, 这时的下行数据报文路 径同 D503。
步骤 508 , 目标 AGW向源 AGW发送锚定 DPF切换响应, 完成 AGW的 切换;
步骤 509 , 源 AGW向终端归属 ILR发送通信对端信息传递请求; 若本地保存的通信对端信息中还有未上 "^终端归属 ILR的信息, 则将未 上报的信息携带在消息中上报终端归属 ILR, 该 ILR保存收到的通信对端的 信息。 若终端归属 ILR中保存了通信对端 AID-RID映射信息, 则源 AGW在 本步骤中上 4艮给终端归属 ILR的通信对端信息中包括终端与通信对端的连接 信息, 通信对端 AID-RID映射信息; 否则, 只需要上"¾终端与通信对端的连 接信息。
步骤 510, 终端归属 ILR根据通信对端的 RID, 向所有对端接入的网关 发送 RID更新通知 , 携带该终端的 AID和新的 RID;
步骤 511 ,终端归属 ILR完成通信对端更新后,向源 AGW回应通信对端 信息传递响应消息, 通知源 AGWAGW通信对端更新完成;
终端归属 ILR也可以在步骤 509后立即执行步骤 511 ,不必等待步骤 510 的完成, 此时步骤 511的含义是 ILR对收到源 AGW消息的确认。 当 ILR执 行完步骤 510后, 可以再给源 AGW发送更新通信对端完成消息。
步骤 512, 源 AGW或目标 AGW释放两者间的数据通道, 源 AGW同时 释放保存的用户上下文、 可能存在的终端与通信对端的连接信息、 该终端的 所有通信对端的 AID-RID映射信息; 对该终端的每一通信对端, 如果该通信对端与接入源 AGW的其他终端 没有通信, 则源 AGW还删除该通信对端的 AID-RID映射信息, 否则继续保 留该通信对端的 AID-RID映射信息。
此步骤可以在步骤 508后启动, 也可以在收到 ILR完成更新通信对端的 通知后 (如步骤 511 ) 启动, 为了更好的保证数据的连续性, 也可以通过定 时器来触发, 如在步骤 508或步骤 511后设置定时器, 定时器超时后再发起 隧道的释放。
步骤 513 , 源 AGW释放与源 ILCR间的隧道;
步骤 514, 目标 AGW向目标基站发起上下文报告流程, 将新的 AGW发 给目标基站, 此步骤在步骤 508后即可执行;
在本实施例中, 当目标 AGW与目标 ILCR间的隧道建立后,上行数据报 文即从该隧道转发, 如 D504、 D506。 可选的, 此时上行数据报文也可以从目 标 AGW与源 AGW之间的隧道转发, 即数据报文从目标 AGW转发到源 AGW, 再到源 ILCR。
在本实施例中, 源 AGW在步骤 509才触发 ILR更新通信对端流程, 可 选的, 步骤 509也可以提前到与步骤 503同时进行, 在这种情况下, 终端归 属 ILR收到源 AGW的通信对端信息传递请求后, 不启动通信对端的更新流 程, 待收到 RID注册后再启动。
各实施例中, 目标 AGW选择目标 ILCR时, 可以釆取下列方式: 方式一、 目标 AGW与终端归属的 AAA服务器交互, 获取本目标 AGW 可以连接的 ILCR的信息, 并从中选择一个 ILCR作为目标 ILCR, 如可以根 据本地策略或者终端指示来选择, 可参照 AGW选择 HA的方式。 漫游情况 下, 该交互需要通过拜访 AAA服务器转发, 拜访 AAA服务器可以在转发过 程中将允许目标 AGW连接的 ILCR信息通知目标 AGW。
方式二、 终端初始入网时, 终端归属的 AAA服务器、 拜访 AAA服务器 已经将该终端允许接入的 ILCR通知给源 AGW, 当进行上述切换时, 由源 AGW在步骤 503中将该信息通知给目标 AGW, 目标 AGW根据配置从中选 择一个 ILCR作为目标 ILCR, 当然也可能只有一个。 方式三、 目标 AGW根据自身的配置信息(如 AGW可连接的 ILCR, 网 络拓朴)选择目标 ILCR。
本发明所说的通信对端信息至少包括终端与通信对端的连接信息, 还可 以包括通信对端的映射信息, 其中终端与通信对端的连接信息包含该终端 AID与所有通信对端 AID的对应关系信息, 该对应关系信息由维护通信对端 信息网元(AGW或 ILCR )从接收的终端的上行或下行数据报文中获取。
各实施例, 维护通信对端信息的目标侧网元(如目标 AGW、 目标 ILCR ) 可以通过以下方式获取通信对端的映射信息
1、 从收到发送给终端的下行数据报文中,获取报文中的通信对端的映射 信息, 或
2、 目标侧网元根据数据报文中通信对端的 AID在本地查询通信对端的 AID-RID映射信息, 其中, 通过目标侧网元接入的正在与通信对端通信的其 它终端, 可能在本地已保存有通信对端的 AID-RID映射信息; 或
3、 如目标侧网元在本地没有查到通信对端的 AID-RID映射信息, 则从 通信对端归属地 ILR查询到通信对端的 AID-RID映射信息并保存在本地; 或
4、 如果目标侧网元在本地没有查到通信对端的 AID-RID映射信息, 则 从源侧网元查询得到通信对端的 AID-RID映射信息并保存在本地。
如图 16所示,在系统一的切换流程中负责维护通信对端信息的 AGW(源 AGW或目标 AGW ) 向 ILR上报、 更新通信对端信息的方法为:
步骤 1601 , 终端接入 AGW后, 与通信对端建立通信, 此后, 终端上下 行数据 文路径如 D1601、 D1602所示;
D1601 , 下行数据报文路径: 同侧的 ILCR收到通信对端发给终端的数据 报文后, 转发给 AGW, AGW剥去该数据报文中封装的 RID, 恢复为通信对 端发送的数据报文的格式后, 通过与终端数据通道发往该终端。
D1602 , 上行数据报文路径: 终端发送上行数据文给基站, 基站将数据 报文转发给 AGW, 再经同侧 ILCR和 /或映射转发平面转发到广义转发平面, 再经广义转发平面送达对端接入的网关。 步骤 1602、 1603 , 为该终端服务的 AGW在收发数据过程中, 发现新的 通信对端, 如根据流实时检测机制, 保存终端与通信对端的连接信息 (即终 端与通信对端的 AID映射信息 )和通信对端的 AID-RID映射信息;
步骤 1604 , AGW向终端归属 ILR发送通信对端信息通知请求消息, 携 带终端与通信对端的连接信息, 同时还可以携带通信对端的 AID-RID映射信 息;
AGW可以根据既定策略, 实时向终端归属 ILR上报通信对端的信息, 即一有变化就进行通知;或者, AGW也可以分批向归属 ILR上报通信对端的 信息, 例如, 每隔一段时间、 或者当通信对端的个数达到预定数量时, 向归 属 ILR上报通信对端的信息。
步骤 1605 , 归属 ILR保存收到的终端与通信对端的连接信息和 /或 AID-RID映射信息;
步骤 1606 , 归属 ILR向 AGW返回响应;
收到归属 ILR返回的成功响应后, AGW可以根据设定策略选择在终端 的通信对端表中继续保留或者删除已上报的通信对端的信息。 而如果既定策 略是釆用实时上报的方式, 则 AGW中无需再保存通信对端表, 从而大大解 决了 AGW中通信对端表过大而占用内存和处理性能的问题。
当终端的某一通信对端的 AID-RID映射关系发生变化(如发生切换)时, AGW在收到通信对端归属 ILR的通知后,更新本地保存的通信对端 AID-RID 映射信息, 若在步骤 1604中将通信对端 AID-RID映射信息报告给归属 ILR, 则此时还需要通知该终端归属 ILR更新该通信对端的 AID-RID映射信息。 当 终端与某一通信对端的通信关系断开或者某一通信对端离线后, 接入网关通 知终端归属地 ILR删除相关通信对端的映射信息。
在各实施例中, 终端归属 ILR更新通信对端的方法为:
A、终端归属身份位置寄存器 ( ILR )在收到更新通信对端的触发消息后, 开始进行更新通信对端的流程, 根据终端与通信对端连接信息, 查找到需要 更新的终端所有的通信对端;
( 1 ) AGW或 ILCR釆用实时方式向终端归属 ILR上 4艮通信对端信息时, 更新通信对端的触发消息为目标 AGW或目标 ILCR发送的 RID注册请求消 息;
本发明的所有实施例中,当 AGW或 ILCR釆用实时上报通信对端信息的 方式时, 在切换过程中, 终端归属 ILR可以不需要源锚定接入接入网关或源 ILCR的触发, 即源 AGW或源 ILCR不用发送通信对端信息传递请求来触发 终端归属 ILR进行更新通信对端的过程, 此时终端归属 ILR在收到目标锚定 接入网关或目标 ILCR的 RID注册后, 直接启动更新通信对端过程。
(2)AGW或 ILCR釆用非实时方式向终端归属 ILR上 4艮通信对端信息时, 更新通信对端的触发消息为后到的通信对端信息传递请求或 RID注册请求; 本发明的所有实施例中, 当 AGW或 ILCR釆用非实时方式, 例如, 每隔 一段时间、 或者当通信对端的个数达到预定数量时, 向归属 ILR上报通信对 端的信息。 目标 AGW或目标 ILCR在进行 RID注册时需要同时上报本地保 存通信对端信息给终端归属 ILR。终端归属 ILR收到源 AGW或源 ILCR发送 的通信对端信息传递请求或者收到目标 AGW或目标 ILCR发送的 RID注册 请求时, 被触发发起通信对端更新流程。
各实施例的具体流程都是以 AGW或 ILCR釆用非实时方式向终端归属 ILR上报通信对端信息时为例进行说明的。
在本发明的所有实施例中,终端归属 ILR完成通信对端更新后, 可选的 , 可以给目标 AGW或目标 ILCR发送更新完成消息 , 目标 AGW或目标 ILCR 可以在此时设置定时器等待释放转发隧道。
终端归属 ILR可以只更新终端 RID注册流程前获得的通信对端 , RID注 册流程后获得的新的通信对端不需要进行更新。 或者简单处理为更新所有通 信对端。
B、 若存在通信对端 AID-RID映射信息, 再根据通信对端 AID-RID映射 信息确定通信对端接入的网关 (如可以根据配置查询, 或者 DNS查询等) ; 若不存在通信对端 AID-RID映射信息, 则可以根据本地配置信息 (如在 ILR 中配置通信对端 AID与接入网关的对应关系 )或 DNS查询等, 确定通信对 端接入的网关, 向所述通信对端接入的网关发送 RID更新通知, 携带该终端 AID和新的 RID的映射信息;
C、通信对端接入的网关收到更新通知后,更新本地緩存的终端 AID-RID 映射信息, 完成更新后, 向终端归属 ILR返回响应消息;
若通信对端归属 ILR中存在终端 AID-RID映射信息, 则通信对端接入的 网关或终端归属 ILR还需要通知通信对端归属 ILR更新终端 AID-RID映射信 息。
D、终端归属 ILR完成通信对端更新后返回成功消息给终端接入的 AGW。 在终端归属 ILR完成通信对端更新流程之前,终端的通信对端连接信息、 通信对端 AID-RID映射信息可能会有更新, 如收到更新通信对端映射信息的 通知, 增加新的通信对端等。 此时终端接入的网关应将通信对端更新信息实 时上报终端归属地 ILR。 归属地 ILR收到该上报后, 更新保存的所述通信对 端的映射信息, 如已向该通信对端原来接入的网关发送了更新终端映射信息 的通知, 则还需要再次向该通信对端新接入的网关发送更新终端映射信息的 通知。
实施例二
本实施例基于系统一的应用身份标识和位置分离技术的 WiMAX系统的 网络架构, 在实现无固定锚点切换的流程中, 使用 ILCR之间的转发隧道进 行数据转发, 且由目标 ILCR发起 ILCR间的转发隧道建立的场景, 具体步骤 下:
步骤 601、 602, 同步骤 501、 502;
D601、 D602, 同 D501、 D502。
在数据报文发送过程中, 源 AGW向终端归属 ILR上报、 更新通信对端 信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 603 , 源 AGW收到目标接入网关锚定 DPF切换触发消息后, 或者 源 AGW决定发起 AGW重定位时, 源 AGW向目标 AGW发送锚定 DPF切 换请求消息, 消息中需要携带源 ILCR的标识信息;
其中标识信息可以是地址, 也可以是专用标识。 此后, 终端上下行数据 报文路径仍然如 D601、 D602所示。 只是此时由目标 AGW向终端归属 ILR 上 ·¾、 更新通信对端信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 604, 同步骤 504;
步骤 605 , 目标 AGW选择目标 ILCR, 向目标 ILCR发起隧道建立流程, 同时将源 ILCR标识信息通知给目标 ILCR;
在隧道建立过程中, 目标 ILCR可能需要与归属 AAA服务器进行交互完 成认证。
其中接入网关与 ILCR之间的隧道可以有多种方式,如 L2TPv3、 IP-in-IP、 MPLS(LDP-based和 RSVP-TE based)、 GRE、 MIP和 IPsec等, 本发明不局 限于任何一种特定的隧道方式。当釆用 MIP,隧道的创建、维护与现有 WiMAX 网络相同。
步骤 606 , 目标 ILCR根据在步骤 605中获得的源 ILCR的标识信息, 则 向源 ILCR发起转发隧道的建立流程;
若目标 ILCR与源 ILCR相同, 否则不执行此步骤。
其中 ILCR 之间的隧道可以有多种方式, 如 L2TPv3、 IP-in-IP、 MPLS(LDP-based和 RSVP-TE based)、 GRE、 MIP和 IPsec等, 本发明不局 限于任何一种特定的隧道方式。此后,终端上下行数据 ^艮文路径如 D603、D604 所示。
D603 , 下行数据报文路径。 源 ILCR收到通信对端发给终端数据报文后, 通过转发隧道转发给目标 ILCR, 目标 ILCR再转发给目标 AGW, 目标 AGW 剥去该数据报文中封装的 RID, 恢复为通信对端发送的数据报文的格式后, 目标接入网关在将该报文通过与终端数据通道发往该终端。
D604, 同 D504。
在数据报文发送过程中, 目标 AGW向终端归属 ILR上报、 更新通信对 端信息, 并可选的维护、 更新本地保存的通信对端信息。
若步骤 606与步骤 605并行执行,即目标 ILCR在建立与目标 AGW之间 的隧道过程中同时建立 ILCR之间的隧道, 步骤 606可能在步骤 605 之前完 成, 此时下行数据报文需要在目标 ILCR上先緩存, 待步骤 605完成后再下 发给目标 AGW。而此时的上行数据报文路径同 D602,只是此时由目标 AGW 对数据报文进行封装和解封装。 在数据报文发送过程中, 目标 AGW向终端 归属 ILR上 ·¾、 更新通信对端信息, 并可选的维护、 更新本地保存的通信对 端信息。
步骤 607至步骤 608, 同步骤 506至步骤 507;
此后, 终端上下行数据才艮文路径如 D605、 D606所示, D605、 D606, 同 D505、 D506。
在数据报文发送过程中, 目标 AGW向终端归属 ILR上报、 更新通信对 端信息, 并可选的维护、 更新本地保存的通信对端信息。
此时, 可能还会存在由源 ILCR转发的数据报文, 这是由于还未通知通 信对端接入的网关未更新终端 AID-RID映射信息导致的, 这时的下行数据报 文路径同 D603。
步骤 609至步骤 614, 同步骤 508至步骤 513;
步骤 615, 源 ILCR或目标 ILCR发起两者间数据转发隧道的释放; 若目标 ILCR与源 ILCR不相同, 则执行此步骤。
步骤 616, 同步骤 514;
在本实施例中, 当目标 AGW与目标 ILCR间的隧道建立后,上行数据报 文即从该隧道转发, 如 D604、 D606。 可选的, 此时上行数据^艮文也可以从目 标 AGW与源 AGW之间的隧道转发, 即数据报文从目标 AGW转发到源 AGW, 再到源 ILCR; 或者从目标 ILCR与源 ILCR间的转发隧道转发。
在本实施例中, 源 AGW在步骤 610才触发 ILR更新通信对端流程, 可 选的, 步骤 610也可以提前到与步骤 603同时进行, 在这种情况下, 终端归 属 ILR收到源 AGW的通信对端信息传递请求后, 不启动通信对端的更新流 程, 待收到 RID注册后再启动。
实施例三
图 7适用于切换过程中数据的转发使用 ILCR之间的转发隧道, 且由源 ILCR发起 ILCR间的转发隧道建立的场景, 其具体步骤描述如下: 步 701 , 同步骤 601 ;
此后, 终端上下行数据 ^艮文路径如 D701、 D702所示, D701、 D702, 同 D601、 D602。
在数据报文发送过程中, 源 AGW向终端归属 ILR上报、 更新通信对端 信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 702, 当目标 AGW准备发起 AGW重定位时, 选择目标 ILCR, 向 源 AGW发送锚定 DPF切换触发消息, 并在消息中携带目标 ILCR标识信息; 其中标识信息可以是地址, 也可以是专用标识。
步骤 703 , 源 AGW收到目标 AGW锚定 DPF切换触发消息后, 而且同 意进行锚定 DPF切换时, 若根据目标 ILCR 的标识信息判断出需要进行跨 ILCR的切换(如源 ILCR与目标 ILCR不相同), 向源 ILCR发送 ILCR切换 请求, 同时携带目标 ILCR标识信息; 否则不执行步骤 703至 705;
步骤 704 , 源 ILCR根据在步骤 703中获得的目标 ILCR的标识信息, 向 目标 ILCR发起转发隧道的建立流程;
其中 ILCR 之间的隧道可以有多种方式, 如 L2TPv3、 IP-in-IP、 MPLS(LDP-based和 RSVP-TE based)、 GRE、 MIP和 IPsec等, 本发明不局 限于任何一种特定的隧道方式。
步骤 705 , 源 ILCR向源 AGW回应 ILCR切换响应;
此后, 终端上下行数据^艮文路径如 D703、 D704所示:
D703 , 下行数据报文路径: 源 ILCR收到通信对端发给终端数据报文后, 通过转发隧道转发给目标 ILCR, 此时下行数据报文需要在目标 ILCR上先緩 存。
D704, 同 D702。 只是此时由目标 AGW对数据 4艮文进行封装和解封装。 在数据报文发送过程中, 目标 AGW向终端归属 ILR上报、 更新通信对 端信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 706至步骤 708, 同步骤 503至 505; 此后, 终端上下行数据^艮文路径如 D705、 D706所示。
D705 , 同 D603。 在 D703中緩存在目标 ILCR上的下行数据报文此时也 需要转发给目标 AGW。
D706, 同 D604。
在数据报文发送过程中, 目标 AGW向终端归属 ILR上报、 更新通信对 端信息, 并可选的维护、 更新本地保存的通信对端信息。
后续步骤 709至步骤 718, 同步骤 607至步骤 616;
后续数据报文路径 D707、 D708同 D605、 D606。
在上述流程中, 步骤 703至步骤 705可以在步骤 708后再执行。
在本实施例中, 当目标 AGW与目标 ILCR间的隧道建立后,上行数据报 文即从该隧道转发, 如 D706、 D708。 可选的, 此时上行数据^艮文也可以从目 标 AGW与源 AGW之间的隧道转发, 即数据报文从目标 AGW转发到源 AGW, 再到源 ILCR; 或者从目标 ILCR与源 ILCR间的转发隧道转发。
在本实施例中, 源 AGW在步骤 712才触发 ILR更新通信对端流程, 可 选的, 步骤 712也可以提前到与步骤 706同时进行, 在这种情况下, 终端归 属 ILR收到源 AGW的通信对端信息传递请求后, 不启动通信对端的更新流 程, 待收到 RID注册后再启动。
系统一中的切换流程中, AGW变化, 不一定会导致 ILCR的变化, 因此 源 AGW需要根据目标 ILCR标识信息, 或者目标 AGW需要根据源 ILCR标 识信息, 判断是否发生了 ILCR的变化, 当 ILCR未发生变化时, 源 ILCR与 目标 ILCR合一,此时不存在源 ILCR与目标 ILCR之间的隧道,不需要建立、 删除两者间的隧道。
系统二
本系统应用上述身份标识和位置分离技术的 Wimax 网络架构仍如图 4a 所示, 包括接入业务网络 (W-ASN)和连接业务网络 (W-CSN) , W-NSP 和 W-CSN包含的功能模块也是相同的。连接业务网络中也包括身份位置核心路 由器 (ILCR), 各 ILCR与支持按 RID路由和转发数据报文的广义转发平面之 间具有数据接口, 但 W-CSN中的 AGW和 W-NSP中的 ILCR与实现身份标 识和位置分离相关的功能与实施例一不同。
本系统中: 身份位置核心路由器 (ILCR)用于为终端分配 RID , 向 ILR注 册和注销终端的 RID, 向 ILR查询通信对端的 RID, 维护终端和通信对端 AID-RID映射信息以及向终端归属 ILR上报、更新通信对端 AID-RID映射信 息, 对数据报文进行 RID封装和解封装, 以及根据 RID实现数据报文的路由 和转发。 AGW或 ILCR维护未更新到 ILR的终端与通信对端的连接信息, 向 终端归属 ILR上 ^艮、 更新终端与通信对端的连接信息, 以及向 ILR注册、 删 除 AID-RID映射信息。
ILR, 位于 W-CSN中, 用于接收所述 AGW对本 ILR归属用户终端的注 册和注销请求, 维护归属用户终端的 AID-RID 映射信息, 以及接收对终端 RID的查询请求, 将请求中该终端 AID对应的 RID返回给查询请求方, 以及 收到更新通信对端的触发后向该终端所有通信对端接入的网关发送 RID更新 通知。
与切换相关地, (如无特别说明, 对应实施例四至十)
所述 ILCR用于在终端切入时, 为该终端分配新的位置标识 (RID)并保存 该终端身份标识 (AID)与该新的 RID的映射信息; 在终端切出后,释放为该终 端分配的资源; 及对切入、 切出终端的数据"¾文进行转发处理;
所述 AGW用于实现终端的 Wimax接入业务网络 (W-ASN)锚定的切换, 及为切入终端选择目标 ILCR, 在与该目标 ILCR间未建立切入终端数据报文 转发的隧道时还建立该隧道, 通过该隧道转发切入终端的数据报文。
所述 ILCR或 AGW还用于向切入终端归属 ILR注册该终端新的 RID; 所述 ILR, 用于注册、 注销、 查询终端的 RID, 以及收到更新通信对端 的触发消息后向该终端所有通信对端接入的网关发送 RID更新通知。
具体地,
所述 AGW包括:
切出控制模块, 用于向目标 AGW发送 AGW切换请求, 切换完成后, 释放为切出终端分配的资源;
切入控制模块, 用于在收到 AGW切换请求后, 选择目标 ILCR, 在目标 ILCR与源 ILCR不同时通知目标 ILCR有终端切入并携带切入终端的 AID, 以及在与该目标 ILCR 间未建立该切入终端数据 文转发的隧道时建立该隧 道, 还用于向该源 AGW发送 AGW切换响应;
所述 AGW中的切出控制模块向目标 AGW发送的 AGW切换请求为锚定 数据通道功能 (DPF)切换请求; 所述 AGW中的切入控制模块向源 AGW发送 的 AGW切换响应为锚定 DPF切换响应。
才艮文转发模块, 用于对切入、 切出终端的数据报文进行转发处理。
所述 ILCR包括:
切出控制模块, 用于终端切出后, 释放为该终端分配的资源;
切入控制模块, 用于在收到有终端切入的通知后, 向 RID分配模块发送 分配通知并携带切入终端的 AID;
RID分配模块, 用于在收到分配通知后为该终端分配指向本 ILCR的新 的 RID, 保存该终端 AID与该新的 RID的映射信息;
才艮文转发模块, 用于对切入、 切出终端的数据报文进行转发处理; 所述 AGW或 ILCR还包括:
RID注册模块,用于在收到 AGW或 ILCR的切入控制模块的注册通知后 发起 RID注册流程,向切入终端归属身份位置寄存器 (ILR)发送注册请求并携 带该切入终端的 AID和新的 RID;
连接信息维护模块, 用于向终端归属 ILR上报、 更新该终端与通信对端 连接信息, 以及维护未更新到终端归属 ILR的终端与通信对端的连接信息;
AGW或 ILCR的报文转发模块, 用于从收到的终端的数据报文中解析出 终端与通信对端的连接信息, 并通知该连接信息维护模块进行维护;
所述 ILR包括:
注册处理模块,用于在收到 ILCR或 AGW的注册请求后, 注册更新终端 的 AID和 RID的对应关系信息;
RID更新模块, 用于根据收到的更新通信对端触发消息发起 RID更新流 程 ,向该终端所有通信对端接入的网关发送 RID更新通知 ,携带该终端的 AID 及新的 RID, 具体地, RID更新模块在发起 RID更新流程时, 根据通信对端 AID-RID的映射信息、本地配置信息或 DNS查询确定所述通信对端接入的网 关, 向所述通信对端接入的网关发送 RID更新通知, 携带该终端 AID和新的 RID的映射信息。
进一步地,
该 AGW或 ILCR的连接信息维护模块实时向终端归属 ILR上报、更新该 终端和通信对端的连接信息;触发该 ILR的 RID更新模块发起 RID更新流程 的更新通信对端触发消息指 AGW发送的 RID注册请求。
进一步地,
该 AGW或 ILCR的连接信息维护模块定时或定量向终端归属 ILR上报、 更新该终端和通信对端的连接信息;
该 AGW或 ILCR的切出控制模块,还用于向终端归属 ILR发送通信对端 信息传递请求, 其中携带该连接信息维护模块还未更新到终端归属 ILR的终 端与通信对端的连接信息, 并通知该连接信息维护模块停止对切出终端的连 接信息的维护;
所述 RID注册模块发送的 RID注册请求中携带该连接信息维护模块还未 更新到终端归属 ILR的终端与通信对端的连接信息;
触发该 ILR的 RID更新模块发起 RID更新流程的更新通信对端触发消息 指后到的通信对端信息传递请求或 RID注册请求。
进一步地, (对应实施例四、 五、 六、 七)
连接信息维护模块在 ILCR中时, ILCR的切出控制模块在收到源 AGW 或该目的 ILCR的切换通知后向终端归属 ILR发送通信对端信息传递请求, 其中该源 AGW在收到该目的 AGW发送的切换响应后向该源 ILCR发送该切 换通知; 该目的 ILCR在与该目的 AGW建立隧道后向该源 ILCR发送该切换 通知; 所述 ILCR还包括映射信息维护模块, 用于向终端归属 ILR上报、 更新 该终端的通信对端的 AID-RID映射信息, 以及维护未更新到终端归属 ILR的 该终端的通信对端的 AID-RID映射信息;
ILCR的切出控制模块向终端归属 ILR发送通信对端信息传递请求中还 携带该映射信息维护模块还未更新到终端归属 ILR的通信对端的映射信息, 并通知该映射信息维护模块停止对切出终端通信对端的映射信息的维护; 所述 RID注册模块发送的 RID注册请求中还携带携带该映射信息维护模 块还未更新到终端归属 ILR的通信对端的映射信息。
进一步地, (对应实施例八、 九、 十)
连接信息维护模块在 AGW中时, AGW的切出控制模块在收到目标 AGW 发送的切换响应后向终端归属 ILR发送通信对端信息传递请求;
所述 ILCR还包括映射信息维护模块, 用于向终端归属 ILR上报、 更新 该终端的通信对端的 AID-RID映射信息, 以及维护未更新到终端归属 ILR的 该终端的通信对端的 AID-RID映射信息;
AGW的切出控制模块, 向终端归属 ILR发送通信对端信息传递请求后, 向源 ILCR发送切换通知;
ILCR的切出控制模块,收到源 AGW发送的切换通知后,向终端归属 ILR 发送通信对端信息传递请求, 其中携带该映射信息维护模块还未更新到终端 归属 ILR的通信对端的映射信息, 并通知该映射信息维护模块停止对切出终 端通信对端的映射信息的维护;
所述 RID注册模块发送的 RID注册请求中还携带携带该映射信息维护模 块还未更新到终端归属 ILR的通信对端的映射信息。
进一步地,
所述 ILCR的映射信息维护模块通过以下方式获取通信对端 AID-RID映 射信息:
根据收到的发送给终端的下行数据报文解析获得; 或 根据数据报文中通信对端的 AID在本地查询通信对端的 AID-RID映射信 息; 或
从通信对端归属 ILR查询到通信对端的 AID-RID映射信息; 或 从源 AGW或源 ILCR查询得到通信对端的 AID-RID映射信息。
进一步地,
所述 AGW还包括隧道建立模块; 所述 AGW的切入控制模块在选择目 标 ILCR后, 还向该隧道建立模块发送隧道建立通知; 所述隧道建立模块用 于在收到隧道建立通知后,通过隧道建立流程为切入终端建立与该目标 ILCR 间的动态隧道; 或者
所述 AGW还包括隧道建立模块, 所述隧道建立模块用于在上电后建立 与 ILCR间的静态隧道; 目标 ILCR根据目标 AGW的通知或通过检查数据报 文获知有终端切换并获取该终端的 AID。
进一步地, (对应实施例四、 八的变换方式, 无需建立下行专用转发隧 道, )
所述 RID注册模块位于 ILCR中, 所述 ILCR的切入控制模块收到 RID 分配模块返回的切入终端新的 RID后,向该切入终端归属 ILR发送 RID注册 请求;
切换过程中, 所述 ILCR 中的报文转发模块将收到的发给切出终端的数 据报文解 RID封装后转发给源 AGW; 将收到的发给切入终端的数据报文解 RID封装后转发给目标 AGW;
所述 AGW中的报文转发模块收到发给切出终端的数据报文后, 通过与 目标 AGW之间的转发隧道转发到该目标 AGW;收到发给切入终端的数据报 文后, 通过与该切入终端之间的数据通道发送到该切入终端。
进一步地, (目标 AGW与目标 ILCR建立下行转发隧道, 源 ILCR根据 通知停止解封装, 对应实施例四、 五、 八变换)
所述 AGW中的隧道建立模块在收到针对切入终端的隧道建立通知后, 与该目标 ILCR之间为切入终端建立或选择第一隧道和第二隧道;
所述 ILCR 中的报文转发模块收到发给切出终端的数据报文后, 对该数 据报文进行解 RID封装并转发给源 AGW; 收到从第一隧道或广义转发平面 发来的切入终端还未解 RID封装的数据报文后进行解 RID封装,通过第二隧 道转发给目标 AGW;
所述 AGW中的报文转发模块收到发给切出终端的数据报文后转发到该 目标 AGW; 收到源 AGW发给切入终端的数据报文后, 通过所述第一隧道转 发到目标 ILCR; 收到目标 ILCR发给切入终端的数据报文后, 通过与该切入 终端之间的数据通道发送到该切入终端;
所述 ILCR中的切出控制模块收到目标 ILCR或源 AGW发送的切换通知 后, 通知所述 ILCR 中的报文转发模块停止对切出终端的数据报文进行解封 装。
进一步地, (目标 AGW与目标 ILCR建立下行转发隧道,一直由源 ILCR 进行解封装, 对应实施例四、 五、 八变换)
所述 AGW中的隧道建立模块在收到针对切入终端的隧道建立通知后, 与该目标 ILCR之间为切入终端建立或选择第一隧道和第二隧道;
所述 ILCR 中的报文转发模块收到发给切出终端的数据报文后, 对该数 据报文进行解 RID封装并转发给源 AGW; 收到从第一隧道发来的切入终端 的数据报文后通过第二隧道转发给目标 AGW;收到从广义转发平面发来的切 入终端的数据报文后进行解 RID封装, 通过第二隧道转发给目标 AGW;
所述 AGW中的报文转发模块收到发给切出终端的数据报文后转发到该 目标 AGW; 收到源 AGW发给切入终端的数据报文后, 通过所述第一隧道转 发到目标 ILCR; 收到目标 ILCR发给切入终端的数据报文后, 通过与该切入 终端之间的数据通道发送到该切入终端。
进一步地, (对应实施例六、 七、 九、 十)
所述 ILCR还包括隧道建立模块,用于为切入终端建立与源 ILCR间的转 发隧道, 或为切出终端建立与目标 ILCR 间的转发隧道, 并在切换完成后释 放该转发隧道;
所述 ILCR中的报文转发模块在源、 目标 ILCR间的转发隧道建立前, 对 收到的发给该终端的数据报文进行解 RID封装后再转发给源 AGW, 在所述 转发隧道建立后将收到的发给该终端的数据报文直接通过该转发隧道转发到 该目标 ILCR; 在源、 目标 ILCR间的转发隧道建立前将收到的发给切入终端 的数据报文直接转发给该目标 AGW;在源、 目标 ILCR间的转发隧道建立后, 将收到的发给切入终端的数据报文进行解 RID封装后再转发或緩存后再转发 给该目标 AGW;
所述 AGW中的报文转发模块收到发给切出终端的数据报文后转发到该
Figure imgf000046_0001
进一步地
所述 AGW中的切入控制模块还用于将目标 ILCR的标识信息发送到源 AGW; 所述 AGW中的切出控制模块还用于将目标 AGW发来的与源 ILCR 不同的目标 ILCR的标识信息发送到源 ILCR; 所述 ILCR中的隧道建立模块 根据目标 ILCR的标识信息为切出终端建立与目标 ILCR之间的转发隧道;或 者
所述 AGW中的切出控制模块还用于将源 ILCR的标识信息发送到目标 AGW; 所述 AGW 中的切入控制模块还用于将源 AGW发来的不同于目标 ILCR的源 ILCR的标识信息发送到目标 ILCR;所述 ILCR中的隧道建立模块 根据源 ILCR的标识信息为切入终端建立与源 ILCR间的转发隧道。
进一步地
所述 AGW中的报文转发模块将收到的切入终端发送的数据报文转发给 源 AGW; 将目标 AGW发来的切出终端发送的数据报文转发给源 ILCR; 且, 所述 ILCR中的 4艮文转发模块将源 AGW发来的切出终端发送的数据报文进行 RID封装并转发到广义转发平面; 或者
所述 AGW中的报文转发模块对收到的切入终端发送的数据报文, 如还 未在本 AGW与目标 ILCR间建立该切入终端数据报文转发的隧道,转发给源 AGW, 否则转发到目标 ILCR; 对目标 AGW发来的切出终端发送的数据报 文, 转发给源 ILCR; 且, 所述 ILCR中的报文转发模块对源 AGW发来的切 出终端发送的数据报文和对目标 AGW发来的切入终端发送的数据报文, 进 行 RID封装后转发到广义转发平面。
进一步地,
所述 AGW中的切入控制模块选择目标 ILCR的方式为以下方式中的一 种:
方式一、所述切入控制模块与切入终端归属的 AAA服务器交互,获取本 目标 AGW可以连接的 ILCR的信息, 从中选择一个 ILCR作为目标 ILCR;
方式二、所述切入控制模块从源 AGW发来的切入终端允许接入的 ILCR 中选择一个 ILCR作为目标 ILCR, 所述允许接入的 ILCR是该切入终端归属 的 AAA服务器发送到源 AGW的;
方式三、 所述切入控制模块根据本 AGW的配置信息选择目标 ILCR。 进一步地,
所述 RID注册模块位于 ILCR中; 所述 ILCR中的切入控制模块向 RID 分配模块发送分配通知并获取为切入终端分配的新的 RID后, 向 RID注册模 块发送注册通知并携带该切入终端的 AID和新的 RID; 或者
所述 RID注册模块位于 AGW中; 所述 ILCR中的切入控制模块向 RID 分配模块发送分配通知并获取为切入终端分配的新的 RID后, 将该新的 RID 发送到目标 AGW; 所述 AGW中的切入控制模块收到目标 ILCR发送的为切 入终端分配的新的 RID后, 向 RID注册模块发送注册通知并携带该切入终端 的 AID和新的 RID。
以下实施例四至实施例十是本发明应用身份标识与位置分离技术的 WiMAX网络系统二中切换流程图。
实施例四
图 8 适用于切换过程中数据的转发使用接入网关之间的转发隧道的场 景, 其具体步骤描述如下: 步骤 801 , 同步骤 501 ;
D801 , 下行数据报文路径: 源 ILCR收到通信对端发给终端数据报文, 剥去该数据报文中封装的 RID, 恢复为通信对端发送的数据报文的格式后, 转发给源 AGW, 源 AGW通过源 AGW与目标 AGW之间的数据通道将数据 报文转发给目标 AGW,目标接入网关在将该报文通过与终端数据通道发往该 终端。
D802, 上行数据报文路径: 终端发送上行数据文给目标基站, 目标基站 将数据报文转发给目标 AGW, 目标 AGW通过源 AGW与目标 AGW之间的 数据通道将数据报文转发给源 AGW, 源 AGW再转发给源 ILCR, 源 ILCR 获取通信对端的 AID , 并查询本地緩存中的 AID-RID映射信息, 如查到通信 对端的 RID, 则将该通信对端的 RID作为目的地址, 该终端的 RID作为源地 址, 封装在该数据报文中, 然后将封装后的数据报文转发到广义转发平面; 如没有查到通信对端的 RID,将数据报文做隧道封装后转发到映射转发平面, 并向 ILR查询通信对端的 RID。 或者将数据报文緩存到本地, 待获得通信对 端的 RID后,再将该通信对端的 RID作为目的地址,该终端的 RID作为源地 址, 封装在该数据报文中, 然后将封装后的数据报文转发到广义转发平面。
在数据报文发送过程中, 源 ILCR向终端归属 ILR上报、 更新通信对端 信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 802, 当目标 AGW准备发起 AGW重定位时, 向源 AGW发送锚定 DPF切换触发消息, 此步骤可选,
步骤 803 , 源 AGW收到目标接入网关锚定 DPF切换触发消息后, 而且 同意进行锚定 DPF切换时, 源 AGW向目标 AGW发送锚定 DPF切换请求消 息;
步骤 804, 目标 AGW选择目标 ILCR, 向目标 ILCR发起转发隧道建立 流程,建立与目标 ILCR之间的用于转发来自源 ILCR的该终端下行数据报文 的专用下行转发隧道, 携带该终端的 AID;
建立专用隧道是为了让目标 ILCR能够区分来自目标 AGW的数据是终端 发送的上行数据还是目标 AGW转发源 AGW过来的下行数据。 另外, 如果 步骤 802未执行, 目标 AGW需要在本步骤先选择目标 ILCR。
其中接入网关与 ILCR之间的隧道可以有多种方式,如 L2TPv3、 IP-in-IP、 MPLS(LDP-based和 RSVP-TE based)、 GRE、 MIP和 IPsec等, 本发明不局 限于任何一种特定的隧道方式。
步骤 805 , 目标 AGW向目标 ILCR发起隧道建立流程;
在隧道建立过程中, 目标 ILCR可能需要与归属 AAA服务器进行交互完 成认证。
其中接入网关与 ILCR之间的隧道可以有多种方式,如 L2TPv3、 IP-in-IP、 MPLS(LDP-based和 RSVP-TE based)、 GRE、 MIP和 IPsec等, 本发明不局 限于任何一种特定的隧道方式。当釆用 MIP,隧道的创建、维护与现有 WiMAX 网络相同。
步骤 805a, 目标 ILCR为该终端分配新的 RID, 并在本地保存更新该终 端 AID-RID映射信息;
此后, 终端上下行数据报文路径如 D803、 D804所示。
D803 , 下行数据报文路径: 源 ILCR收到通信对端发给终端的数据报文 后, 剥去该数据报文中封装的 RID, 恢复为通信对端发送的数据报文的格式, 转发给源 AGW, 源 AGW通过源 AGW与目标 AGW之间的数据通道将数据 报文转发给目标 AGW, 目标 AGW再通过专用下行转发隧道发给目标 ILCR, 目标 ILCR将数据通过目标 AGW与目标 ILCR间的隧道转发给目标 AGW, 目标 AGW再将该报文通过与终端数据通道发往该终端。
D804, 上行数据报文路径: 终端发送上行数据文给目标基站, 目标基站 将数据报文转发给目标 AGW, 目标 AGW再转发给目标 ILCR, 目标 ILCR 获取通信对端的 AID , 并查询本地緩存中的 AID-RID映射信息, 如查到通信 对端的 RID, 则将该通信对端的 RID作为目的地址, 该终端的 RID作为源地 址, 封装在该数据报文中, 然后将封装后的数据报文转发到广义转发平面; 如没有查到通信对端的 RID,将数据报文做隧道封装后转发到映射转发平面, 并向 ILR查询通信对端的 RID。 或者将数据报文緩存到本地, 待获得通信对 端的 RID后,再将该通信对端的 RID作为目的地址,该终端的 RID作为源地 址, 封装在该数据报文中, 然后将封装后的数据报文转发到广义转发平面。
在数据报文发送过程中, 目标 ILCR和 /或源 ILCR向终端归属 ILR上报、 更新通信对端信息, 并可选的维护、 更新本地保存的通信对端信息。 可能存 在对于同一个通信对端 ,源 ILCR已经更新了 ILR,目标 ILCR又再次更新 ILR, 此时, ILR覆盖原先数据或者不处理, 系统二中其他实施例中出现此情况, 也做同样的处理, 后续不再详述。
步骤 806 , 目标 ILCR在分配新的 RID后, 向终端归属 ILR发起 RID注 册流程, 将新分配的 RID带给 ILR, 更新 ILR上终端 AID-RID映射信息; 若本地保存的通信对端信息中还有未上 "^终端归属 ILR的信息, 则将未 上报的信息携带在消息中上报终端归属 ILR, 该 ILR保存收到的通信对端的 信息。 若终端归属 ILR中保存了通信对端 AID-RID映射信息, 则目标 ILCR 在本步骤中上 ^艮给终端归属 ILR的通信对端信息中包括终端与通信对端的连 接信息, 通信对端 AID-RID映射信息; 否则, 只需要上报终端与通信对端的 连接信息。
步骤 807, 归属 ILR收到目标 ILCR的 RID注册请求后, 验证 AID的合 法性, 并保存终端当前 AID-RID的映射信息;
本步骤可以在步骤 805中 ILCR到归属 AAA认证流程中执行。 此后, 终 端上下行数据^艮文路径如 D805、 D806所示。
D805, 下行数据报文路径: 目标 ILCR收到通信对端发给终端数据报文 后, 剥去该数据报文中封装的 RID, 恢复为通信对端发送的数据报文的格式 后转发给目标 AGW, 目标 AGW将该报文通过与终端数据通道发往该终端。
D806, 上行数据才艮文路径。 同 D804。
在数据报文发送过程中, 目标 ILCR向终端归属 ILR上报、 更新通信对 端信息, 并可选的维护、 更新本地保存的通信对端信息。
此时, 可能还会存在由源 ILCR转发的数据报文, 这是由于还未通知通 信对端接入的 ILCR未更新终端 AID-RID映射信息导致的, 这时的下行数据 才艮文路径同 D803。
步骤 808 , 目标 AGW向源 AGW发送锚定 DPF切换响应, 完成 AGW的 切换。 步骤 809 , 源 AGW向源 ILCR发起切换通知, 通知源 ILCR切换完成, 触发源 ILCR通知 ILR发起更新通信对端流程;
步骤 810, 源 ILCR向终端归属 ILR发送通信对端信息传递请求; 若本地保存的通信对端信息中还有未上 "^终端归属 ILR的信息, 则将未 上报的信息携带在消息中上报终端归属 ILR, 该 ILR保存收到的通信对端的 信息。 若终端归属 ILR中保存了通信对端 AID-RID映射信息, 则源 ILCR在 本步骤中上 4艮给终端归属 ILR的通信对端信息中包括终端与通信对端的连接 信息, 通信对端 AID-RID映射信息; 否则, 只需要上"¾终端与通信对端的连 接信息。
步骤 811 , 终端归属 ILR通知通信对端接入的 ILCR更新终端 AID-RID 映射信息;
步骤 812, 终端归属 ILR完成通信对端更新后, 向源 ILCR回应通信对端 信息传递响应消息, 通知源 ILCR通信对端更新完成;
步骤 813 , 源 ILCR给源 AGW回应切换确认消息;
终端归属 ILR也可以在步骤 810后立即执行步骤 812,不必等待步骤 811 的完成, 此时步骤 812的含义是 ILR对收到源 ILCR消息的确认。 当 ILR执 行完步骤 811后, 可以再给源 ILCR发送更新通信对端完成消息, 源 ILCR也 可以随后再给源 AGW发送消息。
步骤 815 , 源 AGW释放或目标 AGW释放两者间的数据通道;
此步骤可以在步骤 808后启动, 也可以在收到 ILR完成更新通信对端的 通知后 (如步骤 813 ) 启动, 为了更好的保证数据的连续性, 也可以通过定 时器来触发, 如在步骤 808或步骤 813后设置定时器, 定时器超时后再发起 隧道的释放。
步骤 815, 源 AGW释放与源 ILCR间的隧道;
步骤 816, 目标 AGW释放与目标 ILCR间的下行转发隧道;
步骤 817, 目标 AGW向目标基站发起上下文报告流程, 将新的 AGW发 给目标基站;
此步骤在步骤 808后即可执行。 在本实施例中, 源 ILCR并不知道是否存在目标 ILCR, 以及其与目标 AGW之间的隧道何时成功建立, 因此源 ILCR对于收到的通信对端发给终端 的数据报文,会始终进行 RID解封装,此时目标 ILCR将不再解封装,如 D803。 可选的,此时也可以不用建立、使用目标 AGW与目标 ILCR之间的转发隧道, 直接使用目标 AGW与源 AGW直接的隧道进行数据转发,如 D801。可选的, 当目标 AGW与目标 ILCR之间的隧道建立成功后, 目标 AGW可以通过源 AGW通知源 ILCR停止下行报文的解封装, 此后下行数据报文路径为: 源 ILCR收到通信对端发给终端的数据报文后, 转发给源 AGW, 源 AGW通过 源 AGW与目标 AGW之间的数据通道将数据报文转发给目标 AGW, 目标 AGW再通过专用下行转发隧道发给目标 ILCR, 目标 ILCR剥去该数据报文 中封装的 RID, 恢复为通信对端发送的数据报文的格式后, 将数据通过目标 AGW与目标 ILCR间的隧道转发给目标 AGW, 目标 AGW再将该报文通过 与终端数据通道发往该终端。
在本实施例中, 当目标 AGW与目标 ILCR间的隧道建立后,上行数据报 文即从该隧道转发, 如 D804、 D806。 可选的, 此时上行数据^艮文也可以从目 标 AGW与源 AGW之间的隧道转发, 即数据报文从目标 AGW转发到源 AGW, 再到源 ILCR。
在本实施例中, 源 AGW在步骤 809才触发源 ILCR通知 ILR发起 ILR 更新通信对端流程, 可选的, 步骤 809也可以提前到与步骤 803同时进行, 在这种情况下, 终端归属 ILR收到源 ILCR的通信对端信息传递请求后, 不 启动通信对端的更新流程, 待收到 RID注册后再启动。
本实施例中, 目标 ILCR获取通信对端的 RID的方式与系统一中 AGW 获取通信对端 RID的方式大体相同, 只需要将执行者变为目标 ILCR, 而在 方式三中, 目标 ILCR是从源 ILCR获得相关信息的。 系统二的其他实施例也 可釆用相同方法来获得通信对端的 RID。
在实施例四至实施例七的切换流程中 ILCR (包括源 ILCR和目标 ILCR ) 向 ILR上 ·¾、 更新通信对端信息的方法与系统一中的方法大体相同, 区别在 于执行者为 ILCR。具体区别如下(此处只描述区别部分,相同部分不再详述 )··
D1601 , 由 ILCR剥去该数据 4艮文中封装的 RID; D1602, 由 ILCR获取通信对端的 AID, 并进行数据 4艮文封装; 步骤 1602、 1603 , 由为该终端服务的 ILCR在收发数据过程中, 发现新 的通信对端, 如根据流实时检测机制, 保存终端与通信对端的连接信息 (即 终端 AID与通信对端的 AID的对应关系 )和通信对端的 AID-RID映射信息。
步骤 1604 , 由 ILCR向终端归属 ILR发送通信对端信息通知请求消息, 携带相关信息;
步骤 1606, 归属 ILR向 ILCR响应, 由 ILCR处理本地緩存的相关信息。 当终端的某一通信对端的 AID-RID映射关系发生变化(如发生切换)时, ILCR在收到通信对端归属 ILR的通知后,更新本地保存的通信对端 AID-RID 映射信息, 若在步骤 1604中将通信对端 AID-RID映射信息报告给归属 ILR, 则此时还需要通知该终端归属 ILR更新该通信对端的 AID-RID映射信息。 当 终端与某一通信对端的通信关系断开或者某一通信对端离线后, ILCR通知终 端归属地 ILR删除相关通信对端的映射信息。
在实施例四至实施例七的切换流程中, 终端归属 ILR更新通信对端的方 法与系统一中的方法大体相同, 只需要将方法中的接入网关变为 ILCR。
实施例五
图 9适用于切换过程中数据转发使用接入网关之间的转发隧道的场景, 其具体步骤描述如下: 步骤 901 -902 , 同步骤 801 -802;
D901、 D902, 同 D801、 D802。
在数据报文发送过程中, 源 ILCR向终端归属 ILR上报、 更新通信对端 信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 903 , 源 AGW收到目标 AGW锚定 DPF切换触发消息后, 而且同 意进行锚定 DPF切换时,源 AGW向目标 AGW发送锚定 DPF切换请求消息, 消息中需要携带源 ILCR的标识信息;
其中标识信息可以是地址, 也可以是专用标识。 步骤 904 , 同步骤 804 , 在隧道建立过程中可以将源 ILCR的标识信息带 给目标 ILCR;
步骤 905 , 同步骤 805 , 在隧道建立过程中可以将源 ILCR的标识信息带 给目标 ILCR;
步骤 906 , 目标 ILCR根据步骤 904或 905中获得的源 ILCR标识信息, 若源 ILCR与目标 ILCR不相同, 则向源 ILCR发起切换通知, 通知源 ILCR 正在进行切换, 触发源 ILCR通知 ILR发起更新通信对端流程, 否则不执行 此步骤;
步骤 907、 908同步骤 810、 812;
步骤 909 , 源 ILCR给目标 ILCR回应切换确认消息;
此后, 终端上下行数据^艮文路径如 D903、 D904所示。
D903 , 下行数据报文路径为: 源 ILCR收到通信对端发给终端的数据报 文后, 转发给源 AGW, 源 AGW通过源 AGW与目标 AGW之间的数据通道 将数据报文转发给目标 AGW, 目标 AGW再通过专用下行转发隧道发给目标 ILCR, 目标 ILCR剥去该数据报文中封装的 RID, 恢复为通信对端发送的数 据报文的格式后, 将数据通过目标 AGW与目标 ILCR间的隧道转发给目标 AGW, 目标 AGW再将该报文通过与终端数据通道发往该终端。
D904同 D804。
在数据报文发送过程中, 目标 ILCR向终端归属 ILR上报、 更新通信对 端信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 905a、 步骤 910、 步骤 911、 步骤 912、 步骤 913、 步骤 914至 917, 同步骤 805a、 步骤 806、 步骤 807、 步骤 811、 步骤 808、 步骤 815至 818。
D905、 D906同 D805、 D806。
在本实施例中步骤 906至 909也可以在步骤 910后执行。
在本实施例中, 当目标 AGW与目标 ILCR间的隧道建立后,上行数据报 文即从该隧道转发, 如 D904、 D906。 可选的, 此时上行数据^艮文也可以从目 标 AGW与源 AGW之间的隧道转发, 即数据报文从目标 AGW转发到源 AGW, 再到源 ILCR。 实施例六
图 10适用于切换过程中数据的转发使用 ILCR之间的转发隧道, 且由目 标 ILCR发起 ILCR间转发隧道建立的场景, 其具体步骤描述如下:
步骤 1001至 1003 , 同步骤 901至 903;
D1001、 D1002, 同 D901、 D902。
在数据报文发送过程中, 源 ILCR向终端归属 ILR上报、 更新通信对端 信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 1004, 同步骤 905;
步骤 1005, 目标 ILCR根据在步骤 1004中获得的源 ILCR的标识信息, 若目标 ILCR与源 ILCR不相同, 则向源 ILCR发起转发隧道的建立流程; 其中 ILCR 之间的隧道可以有多种方式, 如 L2TPv3、 IP-in-IP、 MPLS(LDP-based和 RSVP-TE based)、 GRE、 MIP和 IPsec等, 本发明不局 限于任何一种特定的隧道方式。
步骤 1004a, 同步骤 905a;
步骤 1006至步骤 1009, 同步骤 906至步骤 909;
此后, 终端上下行数据报文路径如 D 1003、 D1004所示。
D1003 ,下行数据报文路径:源 ILCR收到通信对端发给终端数据报文后, 通过转发隧道转发给目标 ILCR, 目标 ILCR剥去该数据报文中封装的 RID, 恢复为通信对端发送的数据报文的格式后, 再转发给目标 AGW, 目标 AGW 将该报文通过与终端数据通道发往该终端。
D1004, 同 D904。
在数据报文发送过程中, 目标 ILCR向终端归属 ILR上报、 更新通信对 端信息, 并可选的维护、 更新本地保存的通信对端信息。
若步骤 1005与步骤 1004并行执行,即目标 ILCR在建立与目标 AGW之 间的隧道过程中同时建立 ILCR之间的隧道, 步骤 1005可能在步骤 1004之 前完成, 此时下行数据报文需要在目标 ILCR上先緩存, 待步骤 1004完成后 再下发给目标 AGW。 而此时的上行数据报文路径同 D1002。
步骤 1010至步骤 1014、 步骤 1016、 步骤 1017, 同步骤 910至步骤 914、 步骤 915、 步骤 917;
D1005、 D1006同 D905、 D906。
在数据报文发送过程中, 目标 ILCR向终端归属 ILR上报、 更新通信对 端信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 1015, 源 ILCR或目标 ILCR发起两者间数据转发隧道的释放; 在本实施例中步骤 1006至 1009也可以在步骤 1010后执行。或者不执行 步骤 1006至 1009, 在步骤 1013或 1003后执行步骤 809至步骤 813。
在本实施例中, 当目标 AGW与目标 ILCR间的隧道建立后,上行数据报 文即从该隧道转发, 如 D1004、 D1006。 可选的, 此时上行数据 4艮文也可以从 目标 ILCR与源 ILCR之间的隧道转发。
实施例七
图 11 适用于切换过程中数据转发使用 ILCR之间的转发隧道, 且由源 ILCR发起 ILCR间转发隧道建立的场景, 其具体步骤描述如下:
步骤 1101 , 同步骤 1001 ;
D1101、 D1102, 同 D1001、 D1002。
在数据报文发送过程中, 源 ILCR向终端归属 ILR上报、 更新通信对端 信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 1102, 当目标 AGW准备发起 AGW重定位时, 选择目标 ILCR, 向 源 AGW发送锚定 DPF切换触发消息, 并在消息中携带目标 ILCR标识信息; 其中标识信息可以是地址, 也可以是专用标识。
步骤 1103至步骤 1105, 同步骤 703至 705;
源 AGW若根据目标 ILCR的标识信息判断出需要进行跨 ILCR的切换, 向源 ILCR发送 ILCR切换请求, 同时携带目标 ILCR标识信息; 否则不执行 步骤 1103-1105。 此后, 终端上下行数据报文路径如 Dl 103、 D1104所示。
D1103 ,下行数据报文路径:源 ILCR收到通信对端发给终端数据报文后, 剥去该数据报文中封装的 RID, 恢复为通信对端发送的数据报文的格式, 通 过转发隧道转发给目标 ILCR,此时下行数据报文需要在目标 ILCR上先緩存。
D1104, 同 D1102。
步骤 1106 , 源 AGW向目标 AGW发送锚定 DPF切换请求消息。
步骤 1107, 目标 AGW向目标 ILCR发起隧道建立流程。 在隧道建立过 程中, 目标 ILCR可能需要与归属 AAA服务器进行交互完成认证。 其中接入 网关与 ILCR 之间的隧道可以有多种方式, 如 L2TPv3 、 IP-in-IP、 MPLS(LDP-based和 RSVP-TE based)、 GRE、 MIP和 IPsec等, 本发明不局 限于任何一种特定的隧道方式。当釆用 MIP,隧道的创建、维护与现有 WiMAX 网络相同。
步骤 1107a, 同步骤 1004a;
此后, 终端上下行数据报文路径如 D1105、 D1106所示。
D1105, 同 D1003。在 D1103中緩存在目标 ILCR上的下行数据报文此时 也需要转发给目标 AGW。
D1106, 同 D1004。
在数据报文发送过程中, 目标 ILCR向终端归属 ILR上报、 更新通信对 端信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 1108至步骤 1117、 步骤 1119, 同步骤 806至步骤 815、 步骤 817;
D1107、 D1108同 D805、 D806。
步骤 1118, 源 ILCR或目标 ILCR发起两者间数据转发隧道的释放; 在本实施例中, 步骤 1111至步骤 1115可以与步骤 1106同时进行, 在这 种情况下, 终端归属 ILR收到源 ILCR的通信对端信息传递请求后, 不启动 通信对端的更新流程, 待收到 RID注册后再启动。
在本实施例中, 也可以不执行步骤 1111至步骤 1115, 而是在步骤 1107 或 1108后执行步骤 1006至 1009。 在本实施例中, 当目标 AGW与目标 ILCR间的隧道建立后,上行数据报 文即从该隧道转发, 如 D1106、 D1108。 可选的, 此时上行数据报文也可以从 目标 ILCR与源 ILCR之间的隧道转发。
实施例八
图 12 适用于切换过程中数据的转发使用接入网关之间的转发隧道的场 景, 流程与图 8基本相同。 其具体步骤描述如下:
步骤 1201至步骤 1205、步骤 1205a, 同步骤 801至步骤 805、步骤 805a;
D1201、 D1202, 同 D801、 D802。
在数据报文发送过程中, 源 AGW向终端归属 ILR上报、 更新通信对端 信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 1205b,在步骤 1205a后,需要将目标 ILCR新分配的 RID在隧道建 立流程中带给目标 AGW。
D1203、 D1204, 同 D803、 D804;
在数据报文发送过程中, 目标 AGW或源 AGW可向终端归属 ILR上报、 更新通信对端信息, 并可选的维护、 更新本地保存的通信对端信息。 可能存 在对于同一个通信对端,源 AGW已经更新了 ILR,目标 AGW又再次更新 ILR, 此时, ILR覆盖原先数据或者不处理, 系统二中其他实施例中出现此情况, 也做同样的处理, 后续不再详述。
步骤 1206, 目标 AGW在收到新分配的 RID后, 向终端归属 ILR发起 RID注册流程, 将新分配的 RID带给 ILR, 更新 ILR上终端 AID-RID映射信 息;
可选的, 此步骤也可以由目标 ILCR进行。
若本地保存的通信对端信息中还有未上 "^终端归属 ILR的信息, 则将未 上报的信息携带在消息中上报终端归属 ILR, 该 ILR保存收到的通信对端的 信息。 目标 AGW上报的通信对端信息包括终端与通信对端的连接信息。
1207至 1208, 同步骤 807至 808; D1205、 D1206同 D805、 D808。
在数据报文发送过程中, 目标 AGW向终端归属 ILR上报、 更新通信对 端信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 1209, 源 AGW向终端归属 ILR发送通信对端信息传递请求; 若本地保存的通信对端信息中还有未上 "^终端归属 ILR的信息, 则将未 上报的信息携带在消息中上报终端归属 ILR, 该 ILR保存收到的通信对端的 信息。 源 AGW上报的通信对端信息包括终端与通信对端的连接信息。
步骤 1210, 源 AGW给源 ILCR发送切换通知;
若终端归属 ILR中保存了通信对端 AID-RID映射信息, 则源 AGW需要 触发源 ILCR向上报 ILR此信息。
步骤 1211 , 源 ILCR收到源 AGW的消息后, 向终端归属 ILR发送通信 对端信息传递请求, 消息中携带未上报终端归属 ILR的通信对端 AID-RID映 射信息;
步骤 1212,终端归属 ILR使用 ILR更新通信对端的方法通知通信对端接 入的 ILCR更新终端 AID-RID映射信息;
步骤 1213-步骤 1214,终端归属 ILR完成通信对端更新后, 向源 ILCR回 应通信对端信息传递响应消息, 源 ILCR再向源关 AGW回应切换确认消息; 步骤 1215, 终端归属 ILR完成通信对端更新后, 向源 AGW回应通信对 端信息传递响应消息;
终端归属 ILR也可以在步骤 1209、 1211后立即执行步骤 1215、 1213 , 不必等待步骤 1212的完成,此时步骤 1213、 1215的含义是 ILR对收到源 ILCR、 源 AGW消息的确认。当 ILR执行完步骤 1212后,可以再给源 ILCR、源 AGW 发送更新通信对端完成消息。
步骤 1216至步骤 1219同步骤 814至步骤 817。
在本实施例中, 源 ILCR并不知道是否存在目标 ILCR, 以及其与目标 AGW之间的隧道何时成功建立, 因此源 ILCR对于收到的通信对端发给终端 的数据报文, 会始终进行 RID解封装, 此时目标 ILCR将不再解封装, 如 D1203。 可选的, 此时也可以不用建立、 使用目标 AGW与目标 ILCR之间的 转发隧道, 直接使用目标 AGW与源 AGW直接的隧道进行数据转发, 如 D1201。 可选的, 当目标 AGW与目标 ILCR之间的隧道建立成功后, 目标 AGW可以通过源 AGW通知源 ILCR停止下行报文的解封装, 此后下行数据 报文路径为:源 ILCR收到通信对端发给终端的数据报文后,转发给源 AGW, 源 AGW通过源 AGW与目标 AGW之间的数据通道将数据报文转发给目标 AGW, 目标 AGW再通过专用下行转发隧道发给目标 ILCR, 目标 ILCR剥去 该数据报文中封装的 RID, 恢复为通信对端发送的数据报文的格式后, 将数 据通过目标 AGW与目标 ILCR间的隧道转发给目标 AGW, 目标 AGW再将 该报文通过与终端数据通道发往该终端。
在本实施例中, 当目标 AGW与目标 ILCR间的隧道建立后,上行数据报 文即从该隧道转发, 如 D1204、 D1206。 可选的, 此时上行数据 4艮文也可以从 目标 AGW与源 AGW之间的隧道转发, 即数据报文从目标 AGW转发到源 AGW, 再到源 ILCR。
在本实施例中, 步骤 1209至步骤 1215, 也可以提前到与步骤 1203同时 进行, 在这种情况下, 终端归属 ILR收到源 AGW、 源 ILCR的通信对端信息 传递请求后, 不启动通信对端的更新流程, 待收到 RID注册后再启动。
本实施例中, 目标 ILCR获取通信对端的 RID的方式与系统二中其他实 施例中目标 ILCR关获取通信对端 RID的方式相同。 系统二的其他实施例也 可釆用相同方法来获得通信对端的 RID。
在本实施例中 AGW 维护终端与通信对端的连接信息的方式可以是由 ILCR根据流实时检测结果通知 AGW进行维护, 或者 AGW自己检测维护。
实施例八至实施例十的切换流程中 AGW向 ILR上报、 更新通信对端信 息的方法与系统一中的方法大体相同, 区别在于由 AGW向 ILR上>¾终端与 通信对端的连接信息 , 由 AGW触发 ILCR向 ILR上 4艮通信对端 AID-RID映 射信息。 具体区别如下 (此处只描述区别部分, 相同部分不再详述) :
D1601 , 由 ILCR剥去该数据 4艮文中封装的 RID;
D1602, 由 ILCR获取通信对端的 AID, 并进行数据 4艮文封装;
步骤 1602、 1603 , 由为该终端服务的 ILCR在收发数据过程中, 发现新 的通信对端 , 如根据流实时检测机制 , 保存通信对端的 AID-RID映射信息。 并通知接入网关保存终端与通信对端的连接信息 (即终端与通信对端的 AID 映射信息) ; 或者为该终端服务的接入网关在收发数据过程中, 发现新的通 信对端, 如根据流实时检测机制, 保存终端与通信对端的连接信息。
步骤 1604, AGW向终端归属 ILR发送通信对端信息通知请求, 携带终 端与通信对端连接信息;
若需要向终端归属 ILR上报通信对端的 AID-RID映射信息, 则 AGW向 IICR发送消息, 触发 ILCR向终端归属 ILR上报未上报给 ILR的通信对端 AID-RID映射信息。
步骤 1606, 归属 ILR向 AGW、 ILCR返回响应。
由 AGW处理本地緩存的终端与通信对端的连接信息。
当终端的某一通信对端的 AID-RID映射关系发生变化(如发生切换)时, ILCR在收到通信对端归属 ILR的通知后,更新本地保存的通信对端 AID-RID 映射信息, 若在步骤 1604中将通信对端 AID-RID映射信息报告给归属 ILR, 则此时还需要通知该终端归属 ILR更新该通信对端的 AID-RID映射信息。 当 终端与某一通信对端的通信关系断开或者某一通信对端离线后, ILCR通知终 端归属地 ILR、 接入网关删除相关通信对端的映射信息。
在实施例八至实施例十的切换流程中, 终端归属 ILR更新通信对端的方 法与实施例四至实施例七中的方法相同。
实施例九
图 13适用于切换过程中数据的转发使用 ILCR之间的转发隧道, 且由目 标 ILCR发起 ILCR间转发隧道建立的场景, 流程与图 10基本相同, 其具体 步骤描述如下:
步骤 1301至步骤 1304、 步骤 1304a, 同步骤 1001至步骤 1004、 1004a; D1301、 D1302同 D1001、 D1002。
在数据报文发送过程中, 源 AGW向终端归属 ILR上报、 更新通信对端 信息, 并可选的维护、 更新本地保存的通信对端信息。 步骤 1304b, 同步骤 1205b;
步骤 1305, 同步骤 1005;
D1303、 D1304, 同 D1003、 1004。
在数据报文发送过程中, 目标 AGW向终端归属 ILR上报、 更新通信对 端信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 1306至步骤 1317、步骤 1319,同步骤 1206至步骤 1217、步骤 1219;
D1305、 D1306同 D1005、 D1006。
在数据报文发送过程中, 目标 AGW向终端归属 ILR上报、 更新通信对 端信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 1318, 源 ILCR或目标 ILCR发起两者间数据转发隧道的释放; 在本实施例中, 当目标 AGW与目标 ILCR间的隧道建立后,上行数据报 文即从该隧道转发, 如 D1304、 D1306。 可选的, 此时上行数据 4艮文也可以从 目标 AGW与源 AGW之间的隧道转发, 即数据报文从目标 AGW转发到源 AGW, 再到源 ILCR。
在本实施例中, 步骤 1309至步骤 1315, 也可以提前到与步骤 1303同时 进行, 在这种情况下, 终端归属 ILR收到源 AGW、 源 ILCR的通信对端信息 传递请求后, 不启动通信对端的更新流程, 待收到 RID注册后再启动。
实施例十
图 14 适用于切换过程中数据转发使用 ILCR之间的转发隧道, 且由源 ILCR发起 ILCR间转发隧道建立的场景, 流程与图 11基本相同。 其具体步 骤描述如下:
步骤 1401至步骤 1407、步骤 1407a,同步骤 1101至步骤 1107,步骤 1107a;
D1401、 D1402、 D1403、 D1404, 同 D1101、 D1102、 D1103、 D1104。 在数据报文发送过程中, 源 AGW向终端归属 ILR上报、 更新通信对端 信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 1407b, 同步骤 1207b; D1405、 D1406, 同 D1105、 D1106。
在数据报文发送过程中, 目标 AGW向终端归属 ILR上报、 更新通信对 端信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 1408至步骤 1421 , 同步骤 1306至步骤 1319;
D1407、 D1408, 同 D1107、 D1108。
在数据报文发送过程中, 目标 AGW向终端归属 ILR上报、 更新通信对 端信息, 并可选的维护、 更新本地保存的通信对端信息。
在本实施例中, 当目标 AGW与目标 ILCR间的隧道建立后,上行数据报 文即从该隧道转发, 如 D1406、 D1408。 可选的, 此时上行数据 4艮文也可以从 目标 AGW与源 AGW之间的隧道转发, 即数据报文从目标 AGW转发到源 AGW, 再到源 ILCR。
在本实施例中, 步骤 1409至步骤 1415, 也可以提前到与步骤 1403同时 进行, 在这种情况下, 终端归属 ILR收到源 AGW、 源 ILCR的通信对端信息 传递请求后, 不启动通信对端的更新流程, 待收到 RID注册后再启动。
系统二中的切换流程中, AGW变化, 不一定会导致 ILCR的变化, 因此 源 AGW需要根据目标 ILCR标识信息, 或者目标 AGW需要根据源 ILCR标 识信息, 判断是否发生了 ILCR的变化, 当 ILCR未发生变化时, 源 ILCR与 目标 ILCR合一,此时不存在源 ILCR与目标 ILCR之间的隧道,不需要建立、 删除两者间的隧道。 当目标 ILCR相同时, ILCR也可以根据策略决定是否为 终端分配新的 RID , 当为终端分配新的 RID时, 可釆用本专利的流程图。
图 5-图 14所示的实施例一至实施例十均以 AGW与 ILCR之间存在动态 隧道为例来阐述切换流程,上述各实施例也可以适用于 AGW与 ILCR间为静 态隧道的场景,此时在切换过程中, 目标 AGW与目标 ILCR间不再需要建立 动态隧道, 两者之间的隧道在两者上电时已经创建成功, 其他步骤相同。 目 标 AGW选择了目标 ILCR后, 可以利用两者之间的隧道通知目标 ILCR有终 端切换并将该终端的 AID发送给目标 ILCR,或目标 ILCR通过检查数据报文 获知有终端切换并获取该终端的 AID。 系统三
图 4b是应用上述身份标识和位置分离技术的另一种 Wimax系统的网络 架构的示意图, 图中实线表示承载面的连接, 虚线表示控制面的连接。 该 Wimax 网络架构包括接入业务网络 (W-ASN)和连接业务网络 (W-CSN)。
W-ASN与广义转发平面之间具有数据面接口,表示为 D1接口。 W-CSN与广 义转发平面之间也可以具有数据面接口, 表示为 D2。 广义转发平面可以是支 持 RID路由和转发数据报文的分组数据网络。
W-CSN中具有 AAA代理或服务器(AAA Proxy/Server ) 、 计费服务器、 互连网关设备等 Wimax架构中的原有网元, 还设置了身份位置寄存器(ILR ) /分组转发功能 (PTF) , 各 W-CSN中的 ILR/PTF构成了映射转发平面。
W-CSN中 HA和 /或 W-CR (核心路由器)可以保留, 也可以将其功能也转 移到 AGW来实现。 W-ASN中包括基站和 AGW, 其中的 AGW在 Wimax架 构中的 AGW所具有的功能实体(包含 DPF功能实体) 的基础上, 扩展了实 现 SILSN所需的新功能。
本实施例中, WiMAX网络中不存在 ILCR, AGW作为对外的数据通道 端点, 用于为终端分配 RID, 向 ILR注册和注销终端的 RID, 向 ILR查询通 信对端的 RID, 维护未更新到 ILR的终端与通信对端的连接信息, 维护终端 和通信对端 AID-RID映射信息, 向终端归属 ILR上 4艮、 更新通信对端信息, 对数据报文进行 RID封装和解封装, 以及根据 RID实现数据报文的路由和转 发等功能。
所述 ILR用于接收所述 AGW对本 ILR归属用户终端的注册和注销请求, 维护归属用户终端的 AID-RID映射信息, 以及接收对终端 RID的查询请求, 将请求中该终端 AID对应的 RID返回给查询请求方 ,收到更新通信对端的触 发消息后, 通知通信对端接入的网关更新终端 AID-RID映射信息。
与切换相关地:
所述 AGW用于在终端切入时, 为该终端分配新的位置标识 (RID)并保存 该终端身份标识 (AID)与该新的 RID的映射信息,向该终端归属 ILR注册该终 端的 RID; 在终端切出后, 释放对该终端分配的资源; 以及对切入、 切出终 端的数据报文进行转发处理;
所述 ILR, 用于注册更新终端的 RID, 以及收到更新通信对端的触发消 息后向该终端所有通信对端接入的网关发送 RID更新通知。
具体地,
所述 AGW包括:
切出控制模块, 用于向目标 AGW发送 AGW切换请求, 切换完成后, 释放为该终端分配的资源;
切入控制模块, 用于在收到 AGW切换请求后, 向位置标识 (RID)分配模 块发送分配通知,携带切入终端 AID,之后, 向 RID注册模块发送注册通知, 向 ILR发送通信对端信息传递请求, 并向源 AGW返回 AGW切换响应; 所述切出控制模块向目标 AGW发送的 AGW切换请求为锚定数据通道 功能 (DPF)切换请求; 所述切入控制模块向源 AGW发送的 AGW切换响应为 锚定 DPF切换响应。
RID分配模块, 用于在收到分配通知后为该终端分配指向本 AGW的新 的 RID, 保存该终端 AID与该新的 RID的映射信息;
RID注册模块, 用于在收到注册通知后发起 RID注册流程, 更新该终端 归属身份位置寄存器 (ILR)保存的该终端的 RID;
连接信息维护模块, 用于向终端归属 ILR上报、 更新该终端与通信对端 连接信息, 以及维护未更新到终端归属 ILR的终端与通信对端的连接信息, 该终端与通信对端的连接信息包含该终端 AID与所有通信对端 AID的对应关 系信息;
才艮文转发模块,用于对切入终端的数据报文进行 RID封装、解 RID封装; 收到发给切出终端的下行数据报文后, 通过与目标 AGW之间的转发隧道转 发到该目标 AGW,收到发给切入终端的下行数据报文时,通过与该终端的数 据通道发送给该终端; 还用于从收到的终端的数据报文中解析出终端与通信 对端的连接信息, 并通知连接信息维护模块进行维护;
所述 ILR包括: 注册处理模块, 用于在收到 AGW发送的 RID的注册请求后, 注册更新 终端的 AID和 RID的对应关系信息;
RID更新模块, 用于根据收到的更新通信对端触发消息发起 RID更新流 程 ,向该终端所有通信对端接入的网关发送 RID更新通知 ,携带该终端的 AID 及新的 RID, 具体地, RID更新模块在发起 RID更新流程时, 根据通信对端 AID-RID的映射信息、本地配置信息或 DNS查询确定所述通信对端接入的网 关, 向所述通信对端接入的网关发送 RID更新通知, 携带该终端 AID和新的 RID的映射信息。
进一步地,
所述连接信息维护模块实时向终端归属 ILR上 ·¾、 更新该终端和通信对 端的连接信息,触发该 ILR的 RID更新模块发起 RID更新流程的更新通信对 端触发消息指 AGW发送的 RID注册请求。
进一步地,
所述连接信息维护模块定时或定量向终端归属 ILR上报、 更新该终端和 通信对端的连接信息;
切出控制模块, 还用于在收到该目的 AGW发送的切换响应后向终端归 属 ILR发送通信对端信息传递请求, 其中携带该连接信息维护模块还未更新 到终端归属 ILR的终端与通信对端的连接信息, 并通知该连接信息维护模块 停止对切出终端的连接信息的维护;
所述 RID注册模块发送的 RID注册请求中携带该连接信息维护模块还未 更新到终端归属 ILR的终端与通信对端的连接信息;
触发该 ILR的 RID更新模块发起 RID更新流程的更新通信对端触发消息 指后到的通信对端信息传递请求或 RID注册请求。
进一步地,
所述 AGW还包括映射信息维护模块, 用于向终端归属 ILR上报、 更新 该终端的通信对端的 AID-RID映射信息, 以及维护未更新到终端归属 ILR的 该终端的通信对端的 AID-RID映射信息。
所述 AGW的映射信息维护模块所获取通信对端 AID-RID映射信息的方 式与系统一相同 ;
进一步地,
所述切出控制模块向目标 AGW发送切换请求时, 向本 AGW中的报文 转发模块发送第一通知;
所述切入控制模块收到源 AGW发来切换请求时, 向本 AGW中的报文 转发模块发送第二通知;
所述 AGW中的报文转发模块在收到所述第一通知之前, 对收到的切出 终端的下行数据报文进行解 RID封装后再转发到目标 AGW, 收到所述第一 通知之后则直接转发到目标 AGW; 在收到所述第二通知之前, 对源 AGW转 发来的切入终端的下行数据报文直接发送到终端, 收到所述第二通知之后在 进行解 RID封装后再发送到终端; 对目标 ILCR转发来的切入终端的下行数 据报文均进行解 RID封装, 再通过与该终端的数据通道发送给该终端。
进一步地,
所述 AGW 中的报文转发模块将收到的切出终端的上行数据报文进行 RID封装后转发到广义转发平面; 在收到所述第二通知之前, 将收到的切入 终端发送的上行数据报文直接转发到源 AGW,在收到所述第二通知之后,对 该上行数据报文进行 RID封装后转发到广义转发平面。
实施例十一
图 15是本发明应用接入标识与位置分离技术的 WiMAX网络系统三中切 换流程图。图 15适用于切换过程中数据的转发使用接入网关之间的转发隧道 的场景, 其具体步骤描述如下: 步骤 1501 , 同步骤 501 ;
此后, 终端上下行数据 ^艮文路径如 D 1501、 D1502所示。
D1501 ,下行数据报文路径:源 AGW收到通信对端发给终端数据报文后, 剥去该数据报文中封装的 RID, 恢复为通信对端发送的数据报文的格式后, 通过源 AGW与目标 AGW之间的数据通道将数据报文转发给目标 AGW, 目 标接入网关在将该报文通过与终端数据通道发往该终端。
D1502, 上行数据报文路径: 终端发送上行数据文给目标基站, 目标基 站将数据报文转发给目标 AGW, 目标 AGW通过源 AGW与目标 AGW之间 的数据通道将数据报文转发给源 AGW, 源 AGW获取通信对端的 AID, 并查 询本地緩存中的 AID-RID映射信息, 如查到通信对端的 RID , 则将该通信对 端的 RID作为目的地址, 该终端的 RID作为源地址, 封装在该数据报文中, 然后将封装后的数据报文转发到目标广义转发平面; 如没有查到通信对端的 RID, 将数据报文做隧道封装后转发到映射转发平面, 并向 ILR查询通信对 端的 RID。 或者将数据报文緩存到本地, 待获得通信对端的 RID后, 再将该 通信对端的 RID作为目的地址, 该终端的 RID作为源地址, 封装在该数据报 文中, 然后将封装后的数据报文转发到广义转发平面。
在数据报文发送过程中, 源 AGW向终端归属 ILR上报、 更新通信对端 信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 1502至步骤 1504, 同步骤 502至步骤 504;
此后, 终端上下行数据 ^艮文路径如 D 1503、 D1504所示。
D1503 , 下行数据报文路径: 源 AGW收到通信对端发给终端的数据报文 后 ,通过源 AGW与目标 AGW之间的数据通道将数据报文转发给目标 AGW, 目标 AGW剥去该数据报文中封装的 RID, 恢复为通信对端发送的数据报文 的格式后, 目标 AGW在将该报文通过与终端数据通道发往该终端。
D1504, 上行数据报文路径: 终端发送上行数据文给目标基站, 目标基 站将数据报文转发给目标 AGW, 目标 AGW获取通信对端的 AID, 并查询本 地緩存中的 AID-RID映射信息, 如查到通信对端的 RID, 则将该通信对端的 RID作为目的地址, 该终端的 RID作为源地址, 封装在该数据报文中, 然后 将封装后的数据报文转发到广义转发平面; 如没有查到通信对端的 RID, 将 数据报文做隧道封装后转发到映射转发平面,并向 ILR查询通信对端的 RID。 或者将数据报文緩存到本地, 待获得通信对端的 RID后, 再将该通信对端的 RID作为目的地址, 该终端的 RID作为源地址, 封装在该数据报文中, 然后 将封装后的数据 >¾文转发到广义转发平面。 在数据报文发送过程中, 目标 AGW向终端归属 ILR上报、 更新通信对 端信息, 并可选的维护、 更新本地保存的通信对端信息。
步骤 1505至步骤 1511 , 同步骤 506至步骤 512;
D1505, 下行数据报文路径: 目标 AGW收到通信对端发给终端数据报文 后, 剥去该数据报文中封装的 RID, 恢复为通信对端发送的数据报文的格式 后, 目标接入网关在将该报文通过与终端数据通道发往该终端。
D1506, 上行数据才艮文路径, 同 D1504。
在数据报文发送过程中, 目标 AGW向终端归属 ILR上报、 更新通信对 端信息, 并可选的维护、 更新本地保存的通信对端信息。
在步骤 1509前, 可能还会存在由源 AGW转发的数据报文, 这是由于还 未通知通信对端接入的网关更新终端 AID-RID映射信息导致的。 这时的下行 数据报文路径同 D1503。
步骤 1512, 同步骤 514;
在本实施例中, 当目标 AGW收到切换请求后, 上行数据报文即直接从 目标 AGW转发, 如 D1504、 D1506。 可选的, 此时上行数据报文也可以从目 标 AGW与源 AGW之间的隧道转发, 即数据报文从目标 AGW转发到源 AGW。
在本实施例中, 源 AGW在步骤 1507才触发 ILR更新通信对端流程, 可 选的, 步骤 1508也可以提前到与步骤 1503同时进行, 在这种情况下, 终端 归属 ILR收到源 AGW的通信对端信息传递请求后, 不启动通信对端的更新 流程, 待收到 RID注册后再启动。
本实施例中, 目标 AGW获取通信对端的 RID的方式同系统一中获取通 信对端 RID的方式。
本实施例中 AGW向 ILR上> ^艮、 更新通信对端信息的方法同系统一中向 ILR上报、 更新通信对端信息的方法, 只是 AGW不再与 ILCR进行交互。
本实施例中, 终端归属 ILR更新通信对端的方法与系统一中更新通信对 端的方法相同。
本发明的所有实施例中, 都是由有目标侧的接入网关或 ILCR向终端归 属 ILR进行终端 RID注册, 可选的, 可以由源侧的接入网关或 ILCR在与目 标侧网元交互中获得目标侧网元为终端分配的 RID后, 向 ILR进行终端 RID 注册。
显然, 本领域的技术人员应该明白, 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布 在多个计算装置所组成的网络上, 可选地, 它们可以用计算装置可执行的程 序代码来实现, 从而, 可以将它们存储在存储装置中由计算装置来执行, 或 者将它们分别制作成各个集成电路模块, 或者将它们中的多个模块或步骤制 作成单个集成电路模块来实现。 这样, 本发明不限制于任何特定的硬件和软 件结合。
为简化描述, 以上所述不仅适用于 WiMAX网络, 也可以适用于其他移 动通信网络。 以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本领域的技术人员来说, 本发明可以有各种更改和变化。 凡在本发明的 精神和原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明 的保护范围之内。
工业实用性 本发明 Wimax系统的无固定锚点的切换方法和 Wimax系统的将身份标 识和位置分离的移动通信网络应用到 WiMAX网络,当终端发生移动切换时, 由终端归属身份位置寄存器(ILR )在收到更新通信对端的触发消息后, 通知 通信对端接入的网关 (AGW、 ILCR或其他的网关如边界网关) 更新终端 AID-RID映射信息,从而实现无固定锚点的切换, 减少了数据包的路径迂回, 降低了传输延时和带宽浪费, 而且还可以达到解决 IP地址双重身份的目的。

Claims

权 利 要 求 书
1、 一种微波接入全球互通( Wimax ) 系统的无固定锚点的切换方法, 该 方法包括:
终端完成 Wimax接入业务网络锚定的切换后, 源接入网关 (AGW)向目标 AGW发送 AGW切换请求;
该目标 AGW收到源 AGW切换请求后,为该终端分配指向本 AGW的新 的位置标识, 保存该终端身份标识与该新的位置标识的映射信息;
该目标 AGW发起位置标识注册流程, 更新该终端归属身份位置寄存器 (ILR)保存的该终端的位置标识; 且该终端归属 ILR收到更新通信对端的触发 消息后发起位置标识更新流程, 向该终端所有通信对端接入的网关发送位置 标识更新通知, 携带该终端的身份标识及新的位置标识; 以及
该目标 AGW向该源 AGW发送 AGW切换响应,完成所述无固定锚点的 切换, 该源 AGW释放为该终端分配的资源, 该终端和通信对端间的数据报 文经该目标 AGW转发。
2、 如权利要求 1所述的切换方法, 其中,
所述 Wimax系统的连接业务网络还包括身份位置核心路由器 (ILCR), 各 个 ILCR具有与广义转发平面之间的数据接口, 所述广义转发平面支持以位 置标识为源地址和目的地址的数据报文的路由和转发;
所述方法还包括:该目标 AGW收到 AGW切换请求后,选择目标 ILCR, 在与该目标 ILCR 间还未建立该终端数据 "^文转发的隧道时建立该隧道; 切 换完成后, 源 ILCR释放为该终端分配的资源, 该终端和通信对端之间的报 文经该目标 AGW和该目标 ILCR转发。
3、 如权利要求 1所述的切换方法, 其中,
各 Wimax接入业务网络中的 AGW与广义转发平面之间具有数据接口, 该广义转发平面支持以位置标识为源地址和目的地址的数据报文的路由和转 发。
4、 如权利要求 1或 2或 3所述的切换方法, 该方法还包括: 所述 Wimax系统中的 AGW根据接收的终端的数据报文获取并维护未更 新到终端归属 ILR的终端与通信对端的连接信息;
在切换过程中, 该源 AGW或目标 AGW通过通信对端信息通知请求实 时向该终端归属 ILR发送终端与通信对端的连接信息;
该终端归属 ILR收到目的 AGW发送的位置标识注册请求后, 根据收到 的终端和通信对端的连接信息发起位置标识更新流程, 并对所述连接信息进 行维护。
5、 如权利要求 1或 2或 3所述的切换方法, 该方法还包括:
所述 Wimax系统中的 AGW根据接收的终端的数据报文获取并维护未更 新到终端归属 ILR的终端与通信对端的连接信息;
在所述无固定锚点切换过程中, 该源 AGW或目标 AGW通过通信对端 信息通知请求定时或定量向该终端归属 ILR发送终端与通信对端的连接信 息;
该源 AGW在收到该目的 AGW发送的切换响应后向该终端归属 ILR发 送通信对端信息传递请求, 其中携带该源 AGW未更新到终端归属 ILR的终 端与通信对端的连接信息; 以及
该目标 AGW发起位置标识注册流程时, 将目标 AGW未更新到终端归 属 ILR的终端与通信对端的连接信息发送给该终端归属 ILR;
该终端归属 ILR收到该源 AGW发送的通信对端信息传递请求或目的 AGW发送的位置标识注册请求中后到的请求后,根据收到的终端和通信对端 的连接信息发起位置标识更新流程, 并对所述连接信息进行维护。
6、 如权利要求 1或 2或 3所述的切换方法, 该方法还包括:
所述 Wimax系统中的 AGW维护接入的终端的所有通信对端的身份标识 和位置标识映射信息;
在所述无固定锚点切换过程中, 该源 AGW或目的 AGW向该终端归属 ILR发送该终端所有通信对端的身份标识-位置标识映射信息; 维护通信对端 信息的目标 AGW通过以下方式获取通信对端身份标识-位置标识映射信息: 收到发送给切入终端的下行数据报文后, 获取报文中的通信对端信息身 份标识-位置标识映射信息; 或
根据数据报文中通信对端的身份标识在本地查询通信对端的身份标识- 位置标识映射信息; 或
从通信对端归属 ILR查询到通信对端的身份标识-位置标识映射信息; 或 从源 AGW查询得到通信对端的身份标识-位置标识映射信息。
7、 如权利要求 1或 2或 3所述的切换方法, 其中, 所述通信对端信息包 括终端与通信对端的连接信息, 该方法还包括:
在所述 Wimax系统中, AGW根据接收的终端的数据报文获取并维护未 传递到终端归属 ILR的终端与通信对端的连接信息, 以及向终端归属 ILR传 递终端与通信对端的连接信息;
该终端归属 ILR发起位置标识更新流程时,根据通信对端身份标识 -位置 标识的映射信息、 本地配置信息或 DNS查询确定所述通信对端接入的网关, 向所述通信对端接入的网关发送位置标识更新通知, 携带该终端身份标识和 新的位置标识的映射信息; 以及
所述通信对端接入的网关收到位置标识更新通知后, 将保存的该终端的 身份标识-位置标识映射信息更新为该通知中携带的所述映射信息。
8、 如权利要求 2所述的切换方法, 其中,
该目标 AGW和目标 ILCR之间的隧道是该目标 AGW选择目标 ILCR后 , 通过隧道建立流程建立的该终端的动态隧道; 或者
该目标 AGW和目标 ILCR之间的隧道为两者上电后建立的静态隧道,目 标 ILCR根据目标 AGW的通知或通过检查数据报文获知有终端切换并获取该 终端的身份标识。
9、 如权利要求 2所述的切换方法, 该方法还包括:
在所述无固定锚点切换过程中, 源 ILCR收到通信对端发送给该终端的 数据报文后转发给该源 AGW, 该源 AGW通过与该目标 AGW之间的转发隧 道将该数据报文转发到该目标 AGW,该目标 AGW再通过与该终端的数据通 道将该数据报文发送给该终端。
10、 如权利要求 2所述的切换方法, 该方法还包括: 在所述无固定锚点 切换过程中,
在该源 ILCR与目标 ILCR不同时, 在该两个 ILCR之间建立转发隧道, 该转发隧道在切换完成后释放;
在该两个 ILCR间的转发隧道建立之前,源 ILCR收到通信对端发给该终 端的数据报文后转发给该源 AGW , 该源 AGW转发到该目标 AGW , 该目标 AGW再通过与该终端间的数据通道将该数据报文发送给该终端; 以及
在该两个 ILCR间的转发隧道建立之后,源 ILCR收到通信对端发给该终 端的数据报文后通过该转发隧道转发到该目标 ILCR, 该目标 ILCR转发或緩 存后再转发到该目标 AGW,该目标 AGW再通过与该终端间的数据通道将该 数据报文发送给该终端。
11、 如权利要求 10所述的切换方法, 该方法还包括: 在所述无固定锚点 切换过程中,
该源 AGW将源 ILCR的标识信息发送到该目标 AGW, 该目标 AGW在 选择的目标 ILCR与该源 ILCR不同时, 将该源 ILCR的标识信息再发送到该 目标 ILCR, 该目标 ILCR建立到该源 ILCR的转发隧道; 或者
该目标 AGW选择目标 ILCR后, 将该目标 ILCR的标识信息发给该源 AGW, 该源 AGW在该目标 ILCR与源 ILCR不同时, 将该目标 ILCR的标识 信息再发送到该源 ILCR, 该源 ILCR建立到该目标 ILCR的转发隧道。
12、 如权利要求 9或 10所述的切换方法, 该方法还包括:
在所述无固定锚点切换过程中, 该目标 ILCR收到通信对端通过广义转 发平面发送给该终端的下行数据报文后,通过该目标 ILCR与目标 AGW之间 的该隧道将该数据报文转发给该目标 AGW,该目标 AGW对该数据报文解位 置标识封装后, 再通过与该终端的数据通道将该数据报文发送给该终端。
13、 如权利要求 3所述的切换方法, 该方法还包括: 在所述无固定锚点 切换过程中,
源 AGW收到通信对端发送给该终端的数据报文后,通过与该目标 AGW 之间的转发隧道将该数据报文转发到该目标 AGW,该目标 AGW再通过与该 终端之间的数据通道将该数据报文发送给该终端; 以及
该目标 AGW收到通信对端通过广义转发平面发送给该终端的下行数据 报文后, 通过与该终端的数据通道将该数据报文发送给该终端。
14、 如权利要求 9, 10或 13所述的切换方法, 该方法还包括: 在所述无固定锚点切换过程中, 在该源 AGW向该目标 AGW发送 AGW 切换请求之前, 由该源 AGW对收到的该终端的下行数据报文进行解位置标 识封装; 在该源 AGW向该目标 AGW发送 AGW切换请求之后, 由该目标 AGW对该源 AGW转发来的该终端的下行数据报文进行解位置标识封装。
15、 如权利要求 1、 2或 3所述的切换方法, 该方法还包括:
该终端归属 ILR完成所述位置标识更新流程之前, 若收到新的通信对端 信息, 则才艮据该新的通信对端信息确定该通信对端接入的网关, 并向该通信 对端接入的网关再次发送位置标识更新通知;
若通信对端归属 ILR中存在该终端身份标识-位置标识映射信息,则通信 对端接入的网关或该终端归属 ILR通知通信对端归属 ILR更新该终端身份标 识-位置标识映射信息。
16、 如权利要求 2所述的切换方法, 其中, 在完成 Wimax接入业务网络 锚定的切换后, 当该终端发送数据报文到接入不同 ILCR的通信对端时, 该 方法还包括:
在该目标 AGW与目标 ILCR建立动态隧道之前或该目标 AGW选择了与 本 AGW建立有静态隧道的目标 ILCR之前,该目标 AGW将收到的该终端发 送的该数据报文转发给该源 AGW,该源 AGW对该数据报文进行位置标识封 装和转发, 通过该源 ILCR和 /或映射转发平面转发到广义转发平面, 再经广 义转发平面送达该通信对端接入的网关; 在该目标 AGW与目标 ILCR建立动态隧道之后或该目标 AGW选择了与 本 AGW建立有静态隧道的目标 ILCR之后,该目标 AGW对该终端发送的上 行数据报文进行位置标识封装, 并通过以下任一路径发送该到通信对端接入 的网关:
通过与目标 ILCR之间的隧道转发到该目标 ILCR, 再经过映射转发平面 和 /或广义转发平面送达该通信对端接入的网关; 或
通过与源 AGW之间的隧道转发到源 AGW再转发到源 ILCR, 再经过映 射转发平面和 /或广义转发平面送达该通信对端接入的网关。
17、 如权利要求 3所述的切换方法, 其中, 在完成 Wimax接入业务网络 锚定的切换后, 当该终端发送数据报文到接入不同 AGW的通信对端时, 该 方法还包括:
该目标 AGW收到源 AGW发送的切换请求前, 将收到的该终端发送的 该数据报文转发给该源 AGW, 该源 AGW对该数据报文进行位置标识封装、 查询并转发到广义转发平面, 送达该通信对端接入的网关;
该目标 AGW收到源 AGW发送的切换请求后, 对该终端发送的数据报 文进行位置标识封装和查询后, 直接转发到广义转发平面; 或者先转发到该 源 AGW, 再经广义转发平面送达该通信对端接入的网关。
18、 如权利要求 2所述的切换方法, 其中, 该目标 AGW选择目标 ILCR 的步骤包括:
该目标 AGW直接或通过拜访 AAA服务器与该终端归属 AAA服务器交 互, 获取本目标 AGW可以连接的 ILCR的信息, 并从中选择一个 ILCR作为 目标 ILCR; 或者
该终端初始入网时, 终端归属 AAA服务器将该终端允许接入的 ILCR直 接或通过拜访 AAA服务器通知给该源 AGW, 源 AGW在所述无固定锚点切 换过程中将该终端允许接入的 ILCR通知给该目标 AGW, 目标 AGW从中选 择一个 ILCR作为目标 ILCR; 或者
目标 AGW根据自身的配置信息选择目标 ILCR。
19、 如权利要求 2所述的切换方法, 其中,
所述 ILR与 AAA服务器合设, 表示为 AAA/ILR, 该 AAA/ILR保存有归 属终端的身份标识-位置标识映射信息; 该目标 AGW在为该终端分配新的位 置标识后, 通过向目标 ILCR发起隧道建立流程实现位置标识的注册; 该目 标 AGW在隧道建立流程中将该终端的身份标识和新的位置标识带到该目标 ILCR,该目标 ILCR再利用到该终端归属 AAA/ILR的认证流程中将该终端的 身份标识和新的位置标识带到该终端归属 AAA/ILR, 该终端归属 AAA/ILR 将保存的该终端的身份标识 -位置标识映射信息中的位置标识更新为收到的 该新的位置标 i只。
20、 如权利要求 2所述的切换方法, 其中,
该源 AGW和源 ILCR释放的为该终端分配的资源至少包括: 该源 AGW 与该目标 AGW之间的转发隧道,该源 AGW和源 ILCR之间为该终端建立的 隧道, 及该源 AGW保存的该终端与通信对端的连接信息。
21、 如权利要求 1 , 2或 3所述的切换方法, 其中,
该源 AGW向该目标 AGW发送的 AGW切换请求为锚定数据通道功能 (DPF)切换请求;
该目标 AGW向该源 AGW发送的 AGW切换响应为锚定 DPF切换响应。
22、 一种实现无固定锚点切换的微波接入全球互通(Wimax ) 系统, 包 括接入业务网络和连接业务网络, 接入业务网络中包括基站和接入网关 (AGW), 所述连接业务网络中包括身份位置寄存器(ILR ) ;
所述 AGW设置为: 在终端切入时, 为该终端分配新的位置标识并保存 该终端身份标识与该新的位置标识的映射信息, 向该终端归属 ILR注册该终 端的位置标识; 在终端切出后, 释放对该终端分配的资源; 以及对切入、 切 出终端的数据报文进行转发处理;
所述 ILR设置为: 注册更新终端的位置标识, 以及收到更新通信对端的 触发后向该终端所有通信对端接入的网关发送位置标识更新通知。
23、 如权利要求 22所述的 Wimax系统, 其中, 所述 AGW包括:
切出控制模块, 其设置为: 向目标 AGW发送 AGW切换请求, 切换完 成后, 释放为该终端分配的资源;
切入控制模块, 其设置为: 在收到 AGW切换请求后, 向位置标识分配 模块发送分配通知, 携带切入终端身份标识, 之后, 向位置标识注册模块发 送注册通知 , 并向源 AGW返回 AGW切换响应;
位置标识分配模块, 其设置为: 在收到分配通知后为该终端分配指向本 AGW的新的位置标识, 保存该终端身份标识与该新的位置标识的映射信息; 位置标识注册模块, 其设置为: 在收到注册通知后发起位置标识注册流 程,向终端归属身份位置寄存器 (ILR)发送位置标识注册请求,更新该终端 ILR 保存的该终端的位置标识;
连接信息维护模块, 其设置为: 向终端归属 ILR上报、 更新该终端与通 信对端连接信息, 以及维护未更新到终端归属 ILR的终端与通信对端的连接 信息; 以及
第一报文转发模块, 其设置为: 对切入终端的数据报文进行位置标识封 装、 解位置标识封装和转发, 及在收到要发送到切出终端的数据报文后向目 标侧转发; 以及从收到的终端的数据报文中解析出终端与通信对端的连接信 息, 并通知连接信息维护模块进行维护;
所述 ILR包括:
注册处理模块, 其设置为: 在收到 AGW发送的位置标识注册请求后, 注册更新终端的身份标识和位置标识的对应关系信息; 以及
位置标识更新模块, 其设置为: 根据收到的更新通信对端触发消息发起 位置标识更新流程, 收到更新通信对端的触发后向该终端所有通信对端接入 的网关发送位置标识更新通知, 携带该终端的身份标识及新的位置标识。
24、 如权利要求 23所述的 Wimax系统, 其中,
所述连接业务网络还包括身份位置核心路由器 (ILCR),各 ILCR与广义转 发平面之间具有数据接口; 所述广义转发平面支持以位置标识为源地址和目 的地址的数据报文的路由和转发; 所述 ILCR 包括第二报文转发模块, 其设 置为: 路由和转发以位置标识为源地址和目的地址的数据 ^艮文;
所述 AGW还包括第一隧道建立模块; 所述 AGW的切入控制模块还设 置为: 在收到 AGW切换请求后选择目标 ILCR, 向该隧道建立模块发送隧道 建立通知; 所述第一隧道建立模块设置为: 在收到隧道建立通知后, 为切入 终端建立与该目标 ILCR间的动态隧道; 或者
所述 AGW还包括第一隧道建立模块, 所述第一隧道建立模块设置为: 在上电后建立与 ILCR间的静态隧道。
25、 如权利要求 23所述的 Wimax系统, 其中,
各 AGW与广义转发平面之间具有数据接口, 该广义转发平面支持以位 置标识为源地址和目的地址的数据报文的路由和转发。
26、 如权利要求 23或 24或 25所述的 Wimax系统, 其中,
所述连接信息维护模块实时向终端归属 ILR上 ·¾、 更新该终端和通信对 端的连接信息; 触发该 ILR的位置标识更新模块发起位置标识更新流程的更 新通信对端触发消息指 AGW发送的位置标识注册请求。
27、 如权利要求 23或 24或 25所述的 Wimax系统, 其中,
所述连接信息维护模块是设置为定时或定量向终端归属 ILR上报、 更新 该终端和通信对端的连接信息;
所述切出控制模块还设置为: 在收到该目的 AGW发送的切换响应后向 终端归属 ILR发送通信对端信息传递请求, 其中携带该连接信息维护模块还 未更新到终端归属 ILR的终端与通信对端的连接信息, 并通知该连接信息维 护模块停止对切出终端的连接信息的维护;
所述位置标识注册模块发送的位置标识注册请求中携带该连接信息维护 模块还未更新到终端归属 ILR的终端与通信对端的连接信息;
所述更新通信对端触发消息指通信对端信息传递请求和位置标识注册请 求中后到的请求。
28、 如权利要求 23或 24或 25所述的 Wimax系统, 其中,
所述 AGW还包括映射信息维护模块, 其设置为: 向终端归属 ILR上报、 更新该终端的通信对端的身份标识-位置标识映射信息, 以及维护未更新到终 端归属 ILR的该终端的通信对端的身份标识-位置标识映射信息; 以及通过以 下方式获取通信对端的身份标识-位置标识映射信息:
根据收到的发送给终端的下行数据报文解析获得; 或
根据数据报文中通信对端的身份标识在本地查询通信对端的身份标识- 位置标识映射信息; 或
从通信对端归属 ILR查询到通信对端的身份标识-位置标识映射信息; 或 从源 AGW或源 ILCR查询得到通信对端的身份标识 -位置标识映射信息。
29、 如权利要求 23或 24或 25所述的 Wimax系统, 其中,
所述 ILR的位置标识更新模块是设置为: 在发起位置标识更新流程时, 才艮据通信对端身份标识-位置标识的映射信息、 本地配置信息或 DNS查询确 定所述通信对端接入的网关, 向所述通信对端接入的网关发送位置标识更新 通知, 携带该终端身份标识和新的位置标识的映射信息。
30、 如权利要求 23、 24或 25所述的 Wimax系统, 其中,
所述 AGW中的第一报文转发模块是设置为: 收到发给切出终端的下行 数据报文后, 通过与目标 AGW之间的转发隧道转发到该目标 AGW, 收到发 给切入终端的下行数据报文时, 通过与该终端的数据通道发送给该终端。
31、 如权利要求 24所述的 Wimax系统, 其中,
所述 ILCR还包括第二隧道建立模块, 其设置为: 为切入终端建立与源 ILCR间的转发隧道, 或为切出终端建立与目标 ILCR间的转发隧道, 并在切 换完成后释放该转发隧道;
在所述无固定锚点切换过程中, 所述 ILCR 中的第二报文转发模块是设 置为:对收到的发给切出终端的数据报文先转发给源 AGW,在源、 目标 ILCR 间的转发隧道建立后则通过该转发隧道转发到该目标 ILCR;对收到的发给切 入终端的数据报文, 通过与目标 AGW间的隧道转发给该目标 AGW。
32、 如权利要求 31所述的 Wimax系统, 其中,
所述切出控制模块还设置为: 将源 ILCR的标识信息发送到目标 AGW; 所述切入控制模块还设置为: 在选择的目标 ILCR与该源 ILCR不同时, 将源 ILCR的标识信息发送到目标 ILCR; 所述 ILCR的第二隧道建立模块是设置 为: 根据收到的源 ILCR的标识信息建立到该源 ILCR的转发隧道; 或者
所述切入控制模块还设置为: 将目标 ILCR的标识信息发给源 AGW; 所 述切出控制模块还设置为: 将收到的目标 ILCR与源 ILCR不同时, 将该目标 ILCR的标识信息发送到源 ILCR; 所述 ILCR中的第二隧道建立模块是设置 为: 根据收到的目标 ILCR的标识信息建立到该目标 ILCR的转发隧道。
33、 如权利要求 23、 24或 25所述的 Wimax系统, 其中,
所述切出控制模块还设置为: 向目标 AGW发送切换请求时, 向本 AGW 中的报文转发模块发送第一通知;
所述切入控制模块还设置为: 收到源 AGW发来切换请求时, 向本 AGW 中的报文转发模块发送第二通知;
所述 AGW中的第一报文转发模块是设置为: 在收到所述第一通知之前, 对收到的切出终端的下行数据报文进行解位置标识封装后再转发到目标 AGW, 收到所述第一通知之后则直接转发到目标 AGW; 在收到所述第二通 知之前, 对源 AGW转发来的切入终端的下行数据报文直接发送到终端, 收 到所述第二通知之后在进行解位置标识封装后再发送到终端; 对目标 ILCR 转发来的切入终端的下行数据 文均进行解位置标识封装, 再通过与该终端 的数据通道发送给该终端。
34、 如权利要求 31所述的 Wimax系统, 其中,
所述 AGW的第一报文转发模块将收到的切出终端的上行数据报文转发 到源 ILCR, 在收到所述第一通知之前还对该上行数据报文进行位置标识封 装; 对收到的切入终端发送的上行数据报文, 如与目标 ILCR 间的隧道未建 立,将该上行数据报文转发到源 AGW,在收到所述第二通知之后还对该上行 数据报文进行位置标识封装, 如与目标 ILCR 间的隧道已建立, 对该上行数 据报文进行位置标识封装后通过与目标 ILCR之间的隧道转发到该目标 ILCR 或通过与源 AGW之间的隧道转发到源 AGW。
35、 如权利要求 32所述的 Wimax系统, 其中,
所述 AGW具有到广义转发平面的数据接口; 所述 AGW中的报文转发 模块是设置为: 将收到的切出终端的上行数据报文进行位置标识封装后转发 到广义转发平面; 在收到所述第二通知之前, 将收到的切入终端发送的上行 数据报文直接转发到源 AGW,在收到所述第二通知之后,对该上行数据报文 进行位置标识封装后转发到广义转发平面。
36、 如权利要求 24所述的 Wimax系统, 其中, 所述切入控制模块是设 置为以如下方式选择目标 ILCR:
所述切入控制模块与切入终端归属的 AAA服务器交互, 获取本目标 AGW可以连接的 ILCR的信息, 从中选择一个 ILCR作为目标 ILCR; 或者 所述切入控制模块从源 AGW发来的切入终端允许接入的 ILCR中选择一 个 ILCR作为目标 ILCR,所述允许接入的 ILCR是该切入终端归属的 AAA服 务器发送到源 AGW的; 或者
所述切入控制模块根据本 AGW的配置信息选择目标 ILCR。
37、 如权利要求 23或 24或 25所述的 Wimax系统, 其中,
所述切出控制模块向目标 AGW发送的 AGW切换请求为锚定数据通道 功能 (DPF)切换请求; 所述切入控制模块向源 AGW发送的 AGW切换响应为 锚定 DPF切换响应。
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