WO2011085636A1 - 一种wcdma核心网及基于wcdma核心网的切换方法 - Google Patents

一种wcdma核心网及基于wcdma核心网的切换方法 Download PDF

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Publication number
WO2011085636A1
WO2011085636A1 PCT/CN2010/080658 CN2010080658W WO2011085636A1 WO 2011085636 A1 WO2011085636 A1 WO 2011085636A1 CN 2010080658 W CN2010080658 W CN 2010080658W WO 2011085636 A1 WO2011085636 A1 WO 2011085636A1
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new
terminal
ggsn
sgsn
rid
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PCT/CN2010/080658
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English (en)
French (fr)
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王志海
吴强
符涛
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中兴通讯股份有限公司
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Publication of WO2011085636A1 publication Critical patent/WO2011085636A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/12—Reselecting a serving backbone network switching or routing node
    • H04W36/125—Reselecting a serving backbone network switching or routing node involving different types of service backbones

Definitions

  • the present invention relates to a WCDMA core network in the field of mobile communications and a handover method based on a WCDMA core network.
  • the existing Wideband Code Division Multiple Access (WCDMA) system is an important system and method for implementing service access based on wireless WCDMA technology.
  • Its core network architecture is shown in Figure la. Including the GPRS (General Packet Radio Service) node (SGSG), the Gateway GPRS Support Node (GGSN), and the home subscriber subscription register, etc., the attribution in the 2G
  • the Home Location Register (HLR) and the Home Subscriber Server (HSS) in 3G are collectively referred to as the Home Subscriber Register, and are represented by HLR/HSS.
  • the SGSN is a basic component network element of the GPRS network. It is a new network element device introduced in the Globle System for Mobile Communication (GSM) network to provide GPRS services. Its main role is to forward the input or output IP packets for the MS of the SGSN service area.
  • GSM Globle System for Mobile Communication
  • the GGSN provides routing and encapsulation of data messages between the WCDMA network and the external data network. Which GGSN the user selects as the gateway is determined according to the subscription information of the user and the access point name requested by the user in the Packet Data Protocol (PDP) context activation process.
  • PDP Packet Data Protocol
  • the HLR/HSS stores the user's packet domain subscription data and routing information.
  • the HLR/HSS can be accessed by the SGSN through the Gr interface, and the GGSN is accessed through the Gc interface.
  • the HLR/HSS may be on a different Public Land Mobile Network (PLMN) than the current SGSN.
  • PLMN Public Land Mobile Network
  • the WCDMA system also defines a single tunnel network architecture, as shown in Figure lb.
  • the architecture and The architecture of Figure la differs in that the data bearer is directly connected to the GGSN by the Radio Network Controller (RNC), which effectively saves the processing of data packets and weakens the functions of the SGSN at the data forwarding and transmission level.
  • RNC Radio Network Controller
  • the mobile network keeps the continuous transmission and reception of the service while the terminal is continuously moving. This is the switching function.
  • the handover function is implemented in the relocation process and the Inter-system change.
  • the relocation process completes the process of changing the access path of the data in the core network with the location of the terminal in the process of using the service data, thereby ensuring the continuity of the service.
  • the relocation process is the most complex process in the mobile communications core network. It involves the functions of data forwarding and routing update.
  • the relocation process is divided into the following scenarios:
  • the first two are distinguished by whether there is an Iur interface between RNCs, which is the main process.
  • the present invention relates to the second.
  • the following describes the relocation process by using joint hard handover and SRNS relocation as an example. There is no Iur interface between RNCs, and the process is only performed when the MS is in the PMM - CONNECTED state.
  • the joint hard handover and SRNS relocation procedures are used to perform the hard handover determined by the UMTS Terrestrial Radio Access Network (UTRAN), and the UTRAN is migrated from the source RNC to the target RNC on the UTRAN side to the CN connection point. .
  • the Iu link is relocated. If the target RNC is connected to the same SGSN as the source RNC, the relocation procedure inside the SGSN SRNS is performed. If the SGSN to which the target RNC is connected is different from the SGSN to which the source RNC is connected, the SRNS relocation procedure between the SGSNs is performed. After performing this process, the routing area update process between the SGSNs is then performed.
  • the present invention is concerned with the SRNS relocation process between SGSNs.
  • Figure 2a shows the situation before the joint hard handover and SRNS relocation and routing area update when the source RNC and the target RNC are connected on different SGSNs.
  • Figure 2b shows the situation after joint hard handoff and SRNS relocation and routing area update.
  • the MS is registered in the pre-SGSN and the pre-MSC/VLR.
  • the source RNC is used as a serving RNC (SRNC).
  • SRNC serving RNC
  • the MS registers with the new SGSN and the new MSC/VLR.
  • the MS is in the PMM-CON ECTED state
  • the new MSC/VLR the MS is in the MM IDLE state and the target RNC is used as the serving RNC.
  • Step 301 The source RNC initiates joint hard handover and SRNS relocation of the PS domain.
  • Step 302 The source RNC initiates a relocation preparation process by sending a Relocation Required message to the former SGSN (01d SGSN).
  • the relocation type is set to "involving UE”.
  • Step 303 The front SGSN sends a "Forward Relocation Required" message to the new SGSN according to the target cell ID, if it is determined that the SRNS relocation is an SRNS relocation between the SGSNs, and initiates a relocation resource allocation process;
  • Step 304a The new SGSN sends a relocation request message to the target RNC. According to the location information of the terminal that requests relocation, the address of the new SGSN corresponding to the terminal is found.
  • the relocation request message includes a permanent NAS UE identification number, a reason, a CN domain indicator, a transparent container from the source RNC to the target RNC, and a Radio Access Bearer (RAB) to be set.
  • RAB Radio Access Bearer
  • Step 304b The target RNC accepts all necessary resources of the RAB, including the successful assignment of the Iu user plane, establishing an RAB bearer with the new SGSN, and sending a Relocation Request Acknowledge message to the new SGSN;
  • the relocation request confirmation message includes: a target RNC to the source RNC transparent container, an RAB setting, a RAB setting failure, and the like.
  • the transparent container contains all the wireless related information required for the MS handover, ie complete RRC message (such as physical channel reconfiguration), transparently transmitted through the CN and the source RNC.
  • RRC message such as physical channel reconfiguration
  • the target RNC receives the downlink PDU forwarded from the source RNC and the downstream PDU from the new SGSN for each RAB to be set (defined by the IP address and tunnel endpoint identifier).
  • Step 305 After the resource for transmitting user data between the target RNC and the new SGSN is allocated, and the new SGSN is ready for relocation of the SRNS, the new SGSN sends a "Forward Relocation Response" message to the former SGSN. ;
  • the Forward Relocation Response message includes: Cause, UTRAN Transparent Container, RANAP Cause, and Target RNC Information. Indicates that the target RNC is ready to receive downstream packets from the source RNC that have not been verified by the MS. At this point, the relocation resource allocation process was successfully terminated.
  • Step 306 The former SGSN sends a Relocation Command message to the source RNC to continue relocation of the source RNS.
  • the relocation command message includes: a transparent container from the target RNC to the source RNC, an RAB to be released, and an RAB subject to data forwarding restrictions.
  • the former SGSN determines the RABs subject to data forwarding according to Quality of Service (QoS), and those RABs should be included in the RAB subject to data forwarding.
  • QoS Quality of Service
  • Step 307 After receiving the relocation command message from the PS domain, the source RNC starts the data forwarding timer, and starts forwarding data for the RAB subject to the data forwarding restriction.
  • Data forwarding in SRNS relocation should be performed through the Iu interface, meaning that data exchanged between the source RNC and the target RNC is replicated in the source RNC and sent to the target RNC at the IP layer.
  • Step 308 When the relocation preparation process is successfully terminated, and the source RNC is ready, the source RNC triggers the execution of the SRNS relocation by sending an RRC message provided in the "target RNC to the source RNC transparent container" to the MS.
  • the RRC message may be a physical channel reconfiguration message (Physical Channel Reconfiguration), and the message carries the UE information element and the CN transparent container.
  • Physical Channel Reconfiguration Physical Channel Reconfiguration
  • Step 309 The source RNC sends a "Forward SRNS Context" (RAB Context) message to the target RNC via the former SGSN (old SGSN) and the new SGSN (new SGSN), and continues to perform SRNS relocation by forwarding the SRNS context.
  • Confirm Forward SRNS Context Acknowledge
  • the purpose of this process is to migrate the SRNS context from the source RNC to the target RNC when a handover in the CN occurs.
  • the target RNC resets and restarts the RLC connection, and at the target RNC
  • the Packet Data Convergence Protocol (PDCP) sequence number (PDCP-SNU, PDCP-SND) is exchanged with the MS.
  • PDCP Packet Data Convergence Protocol
  • Step 310 The target RNC detects the terminal, and when receiving the relocation execution trigger message, the target RNC sends a Relocation Detect message to the new SGSN;
  • the relocation execution trigger message may be from
  • the target RNC should start the SRNC operating mode.
  • Step 311 After the terminal is reconfigured, the RRC message, such as a Physical Channel Reconfiguration Complete message or a radio release completion message, is sent to the target RNC, indicating that the target RNC can start to exchange the packet with the MS.
  • the RRC message such as a Physical Channel Reconfiguration Complete message or a radio release completion message
  • the target RNC After receiving the message sent by the UE, the target RNC sends a Relocation Complete message to the new SGSN to initiate a relocation completion process.
  • Step 312 the new SGSN sends a Forward Relocation Complete (Forward Relocation Complete) message to notify the former SGSN, the SRNS relocation process is completed, and the former SGSN returns a Forward Relocation Complete Acknowledge message to the new SGSN.
  • a Forward Relocation Complete Forward Relocation Complete
  • the purpose of the relocation completion process is to indicate to the CN that the SRNS relocation is complete by the target RNC. If the user plane has not been switched in the relocation detection, the CN should switch the user plane from the source RNC to the target RNC after receiving the relocation complete message.
  • Step 313 After receiving the relocation detection message, the new SGSN sends an Update PDP Context Request message to the relevant GGSN, carrying the new SGSN address, the SGSN tunnel endpoint identification number, and the negotiated QoS.
  • the GGSN updates their PDP context fields and returns an Update PDP Context Response message carrying the GGSN tunnel endpoint identification number;
  • Step 314 After receiving the Forward Relocation Complete message, the former SGSN sends an Iu Release Command (Iu Release Command) message to the source RNC. When the RNC data forwarding timer expires, the source RNC responds with an Iu Release Complete (Iu Release Complete). Message
  • Step 315 After the MS completes the reconfiguration process, if the new routing area identifier is different from the previous one, the MS initiates a routing area update process.
  • the routing area update process is to register the current location information of the MS in the new SGSN and update the new SGSN information into the HLR.
  • the routing area update part of this flow is only a subset of the RA update process performed because the MS is in the PMM-CON ECTED state.
  • WCDMA systems can provide users with multiple types of business applications, but there are also many application problems, such as:
  • the GGSN is unchanged and there is a route bypass.
  • the GGSN remains unchanged during the connection and use of the service. In this way, when the user moves, it is possible to move to a place far away from the GGSN and close to the service source, thereby causing the path to be bypassed.
  • Using a static public address as the IP address of the terminal has a great limitation on the mobility of the user.
  • a static public IP address can only be removed from a fixed gateway due to route planning. Once you move to a remote location, you cannot access the external network nearby. Inevitably caused routing back.
  • the mobility management process to ensure business continuity is complex.
  • the current mobility management process is complex, as shown in the various processes above.
  • the main reason is to ensure business continuity, the terminal IP address is immutable, the GGSN is immutable, and the related bearer must have an anchor point. All information in response must be accurately passed and rebuilt.
  • the above problems are essentially caused by the commonality of TCP/IP addresses and identities.
  • the industry has proposed a variety of new mobile management technologies.
  • the essential idea is the separation of user identity and location.
  • SILSN Subscriber Identifier & Locator Separation Network
  • host-based implementations such as HIP technology
  • router-based implementations such as Location Identity Separation Protocol (LISP) technology.
  • LIP Location Identity Separation Protocol
  • Each implementation is supported by a variety of technologies.
  • the identity of the end user (indicated as AID in the text) does not change during the mobile process, and the location identifier (represented as RID in the text) is additionally assigned according to the location of the terminal. Implement routing and forwarding of data packets.
  • Figure 4a shows a network architecture of identity and location separation (SILSN).
  • the network topology of the SILSN architecture is divided into an access network and a backbone network with no overlapping relationships in the topology relationship.
  • the access network is located at the edge of the backbone network.
  • the backbone network is responsible for routing and forwarding data packets between terminals.
  • the user ID of the AID as the terminal 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.
  • the identity and location identifiers may have different names in different SILSN architectures, but the essence is the same of.
  • 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 physical layer and link layer
  • the main network elements of the backbone network include:
  • the Access Service Node is used to allocate RIDs to the terminal, maintain AID-RID mapping information of the terminal, register and query the RID of the terminal, and implement routing and forwarding of data packets.
  • the terminal must access the backbone network through the ASN.
  • the RID allocated by the ASN for the terminal contains the address information of the ASN, or points to the ASN, and the RID is used as the destination address of the data packet, the data packet will be routed to the ASN.
  • a common router (CR) 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 Identity Location Register (ILR) is used to store and maintain the identity and location identifier mapping information of the home user terminal.
  • the text is also written as AID-RID mapping information to process registration, deregistration and query of the terminal location. ;
  • the backbone network may further include:
  • the Packet Transfer Function also known as the packet forwarding function node, is used to route and forward data packets with the AID as the destination address.
  • ISN Internet Service Node
  • the interface of the ILR is used to implement interconnection between two networks.
  • the above ILR, or ILR and PTF form the mapping forwarding plane of the backbone network, CR, or CR and ISN constitute the generalized forwarding plane of the backbone network.
  • the format of data packets forwarded between ASNs is as shown in Figure 4b.
  • the source AID of the inner layer is the AID of the terminal
  • the destination AID is the AID of the communication peer
  • the source RID is the RID of the terminal
  • the destination RID is the RID of the communication peer.
  • the RID of the terminal is used to address the ASN accessed by the terminal
  • the RID of the communication peer is used to address the ASN accessed by the communication peer.
  • the Layer 2 header is a encapsulation when there is a tunnel between two ASNs.
  • the ASN receives the uplink data packet for RID encapsulation and forwarding.
  • the ASN queries the RID of the communication peer locally, such as querying, and uses the RID of the communication peer as the destination address, and the terminal RID as the source address is encapsulated in the data packet including the terminal AID and the communication peer AID, and is forwarded in a generalized manner.
  • the plane forwards to the ASN of the communication peer. If it is not queried, it is necessary to go to the communication peer to the ILR to query the RID of the communication peer and save it locally. In this case, the RID of the terminal can be encapsulated in the packet, and then forwarded to the generalized forwarding plane through the mapping forwarding plane. After the RID of the communication peer is queried, the RSN of the communication peer is locally queried by the ASN.
  • the RID encapsulation and forwarding process is performed in a timely manner.
  • the ASN receives the data packet sent by the generalized forwarding plane, performs RID encapsulation, and strips the RID and sends it to the terminal.
  • the ASN needs to allocate the RID to the terminal when the terminal accesses, and needs to register the RID with the ILR to update the RID of the terminal in the ILR.
  • the ASN also needs to maintain the AID-RID mapping information of the terminal and its communication peer to implement RID encapsulation of the message.
  • the ASN maintains the peer information of the terminal for each terminal (also referred to as connection information between the terminal and the communication peer, or communication relationship information between the terminal and the communication peer), where the terminal AID and its communication pair are included.
  • Correspondence information of the terminal AID such as the AID of the terminal and its communication peer in the peer table.
  • the AID-RID mapping information of the terminal may also be included, and the ASN uniformly maintains the AID-RID mapping information of the communication peers of all terminals. Of course, it is also possible for the ASN to maintain the AID-RID mapping information of all communication peers for each terminal separately.
  • the SILSN architecture can be applied to the existing WCDMA core network to implement mobility management and service access, which can effectively solve the above problems of WCDMA.
  • the prior art does not propose a corresponding implementation scheme for how to support the identity identification and location separation of the terminal in the handover process of the WCDMA system, and avoid route degeneration.
  • the invention provides a WCDMA core network and a handover method based on a WCDMA core network to avoid route bypass.
  • the present invention provides a handover method based on a WCDMA core network, including:
  • GGSN gateway GPRS node
  • the new GGSN allocates a new location identifier (RID) to the terminal, and saves mapping information of the terminal identity (AID) and the new RID;
  • the new GGSN or the new SGSN sends a RID registration request to the terminal home identity register (ILR), carrying the new RID, and the terminal belongs to the ILR to update the saved RID of the terminal;
  • ILR terminal home identity register
  • the bearer associated with the terminal between the former SGSN and the former GGSN is released, and the terminal is connected to the external packet data network through the new SGSN and the new GGSN.
  • the foregoing handover method may further include: the front SGSN saves and maintains the peer information of the terminal, and the peer information includes the correspondence relationship between the terminal AID and the AID of the communication peer of the terminal; and the former SGSN maintains during the handover process.
  • the peer information of the terminal is transmitted to the new SGSN.
  • the front SGSN or the new SGSN searches for the address information of the gateway accessed by the communication peer according to the AID of the communication peer in the peer information of the terminal, and accesses the address of the gateway connected to the communication peer.
  • the gateway sends a RID update notification, carrying the terminal AID and the new RID.
  • the foregoing handover method may further include: the front GGSN saves and maintains the peer information of the terminal and the AID-RID mapping information of the communication peer end of the terminal, and the peer end information includes the correspondence between the AID of the terminal and the AID of the communication peer end of the terminal.
  • the former GGSN or the new GGSN searches for the RID of the communication peer of the terminal from the local or the mapping server, and sends a RID update notification to the gateway accessed by the communication peer, carrying the AID of the terminal and the new RID.
  • the foregoing switching method may further include: the front GGSN saves and maintains the communication peer end of the terminal
  • the former GGSN transmits the maintained AID-RID mapping information of the terminal of the terminal to the new GGSN, and the new GGSN maintains the data locally after receiving the data packet of the terminal.
  • the AID-RID mapping information of the communication peer of the terminal is transmitted before the GGSN is received. After the AID-RID mapping information is sent, the mapping information is merged with the locally maintained AID-RID mapping information.
  • the foregoing handover method may further include: after receiving the data packet sent to the terminal, the pre-GGSN sends the data packet to the source radio side network element, and the data packet passes the source radio side network element and the target radio.
  • the forwarding channel between the side network elements is forwarded to the target radio side network element, and is sent by the target radio side network element to the terminal.
  • a forwarding channel between the former GGSN and the new GGSN is established, and the former GGSN receives the transmission.
  • the data packet is sent to the new GGSN through the forwarding channel, and the new GGSN sends the data packet to the target radio side network element via the new SGSN, and the target wireless side network element sends the data packet to the terminal.
  • the foregoing switching method may also have the following features: After receiving the forwarding relocation request of the former SGSN, the new SGSN selects a new GGSN for the terminal, interacts with the new GGSN to establish a PDP bearer of the terminal, and transmits the AID of the terminal to the terminal.
  • the new GGSN the new GGSN allocates a new RID to the terminal after receiving the AID of the terminal; the new GGSN directly sends a RID registration request to the ILR to which the terminal belongs, or the new GGSN sends a message or a new message through the PDP bearer.
  • the new RID is transmitted to the new SGSN.
  • the new SGSN interacts with the target RNC to establish the RAB of the terminal, it sends a RID registration request to the ILR to which the terminal belongs, and returns a forwarding relocation response message to the forward GGSN.
  • the foregoing handover method may further include: the new GGSN transmits the new RID to the new SGSN, and the new SGSN sends the new RID to the former SGSN by forwarding a relocation response message; wherein the former SGSN is after receiving the new RID And searching for the address information of the gateway accessed by the communication peer according to the AID of the communication peer in the peer information of the terminal, and sending an RID update notification to the gateway accessed by the communication peer, carrying the AID and the new terminal of the terminal RID; The former SGSN transmits the currently maintained peer information of the terminal to the new SGSN by forwarding the relocation completion confirmation message or forwarding the SRNS context message or the new message. Before the transmission, the former SGSN finds that the terminal has a new one. The communication peer end registers the AID of the new communication peer in the peer information of the terminal and sends an RID update notification to the gateway accessed by the new communication peer.
  • the pre-SGSN is a forwarding relocation completion confirmation message or a forwarding SRNS context message or a new message sent to the new SGSN after receiving the relocation relocation response message returned by the new SGSN, and the terminal will be maintained.
  • the peer information is transmitted to the new SGSN, and the new SGSN is The address information of the gateway accessed by the communication peer is found according to the AID of the communication peer in the peer information, and the RID update notification is sent to the gateway accessed by the communication peer.
  • the foregoing handover method may further include: after the new GGSN is allocated to the terminal, the new SGSN, the former SGSN sends an information request to the forward GGSN; wherein, the former SGSN is the pair of the terminal to be maintained after receiving the information request.
  • the end information and/or the AID-RID mapping information of the communication peer of the terminal is transmitted to the new GGSN via the pre-SGSN and the new SGSN, and the new GGSN queries the RID of the communication peer according to the AID of the communication peer in the received peer information.
  • the gateway accessing the communication peer sends a RID update notification.
  • the step of establishing a forwarding channel between the pre-GGSN and the new GGSN may be: establishing a forwarding channel of the terminal between the pre-GGSN and the new GGSN by using one of the following manners:
  • the location response sends the address information of the new GGSN to the former SGSN, and the former SGSN transmits the address information of the new GGSN to the former GGSN.
  • the former GGSN interacts with the new GGSN according to the address information to establish a forwarding channel of the terminal with the new GGSN.
  • the former SGSN transmits the address information of the former GGSN to the new SGSN
  • the new SGSN transmits the address information of the previous GGSN to the new GGSN when establishing the PDP bearer of the terminal with the new GGSN.
  • the new GGSN interacts with the former GGSN according to the address information of the former GGSN, and establishes a forwarding channel of the terminal with the former GGSN;
  • the former GGSN forwards the received packet to the terminal to the new GGSN through the forwarding channel, and the new GGSN sends the packet to the target wireless side network element through the new SGSN.
  • the above switching method may also have the following features: When the forwarding channel usage mode is established, the new
  • the address information of the GGSN is the new RID of the terminal; or, when the forwarding channel is established in the second mode, the new SGSN sends the new RID of the terminal to the former GGSN by using a message when the channel is established; wherein, the former GGSN is After receiving the new RID of the terminal, the RID of the communication peer is found according to the maintained peer information of the terminal and the AID-RID mapping information of the communication peer of the terminal, and the RID is sent to the gateway accessed by the communication peer.
  • the update notification carries the AID of the terminal and the new RID; after that, the former GGSN transmits the maintained peer information of the terminal and/or the AID-RID mapping information of the communication peer of the terminal to the new GGSN.
  • the above switching method may also have the following features:
  • the former GGSN is establishing the turn with the new GGSN.
  • the peer information of the terminal and/or the AID-RID mapping information of the communication peer end of the terminal is transmitted to the new GGSN, and the new GGSN is based on the communication pair in the transmitted peer information.
  • the AID of the terminal queries the RID of the communication peer, and sends an RID update notification to the gateway accessed by the communication peer, carrying the AID of the terminal and the new RID.
  • the new SGSN selects a new GGSN for the terminal after receiving the forwarding relocation completion confirmation message in the relocation completion process, and establishes a PDP bearer of the terminal between the new GGSN and the The AID of the terminal is transmitted to the new GGSN.
  • the new GGSN allocates a new RID to the terminal
  • the new GGSN sends a RID registration request directly to the ILR to which the terminal belongs, or the new GGSN transmits the new RID through a PDP bearer setup message or a new message.
  • the new SGSN sends a RID registration request to the home ILR of the terminal.
  • the foregoing handover method may further include: the new GGSN transmits the new RID to the new SGSN by using a PDP bearer setup message or a new message, and the new SGSN transmits the new RID to the pre-SGSN; wherein the pre-SGSN is receiving the new SGSN After the RID, the address information of the gateway accessed by the communication peer is found according to the AID of the communication peer in the peer information of the maintained terminal, and the RID update notification is sent to the gateway accessed by the communication peer, carrying the AID of the terminal and the new After the RID update process is initiated, the new GGSN continues to maintain the peer information of the terminal. After the RID update process ends, the maintained peer information of the terminal is transmitted to the new SGSN for storage and maintenance.
  • the foregoing handover method may further include: after the new GGSN or the new SGSN sends the RID registration request to the ILR to which the terminal belongs, the new GGSN forwards the GGSN, or the new SGSN requests the opposite information from the forward SGSN.
  • the foregoing handover method may further include: the new GGSN transmits the new RID to the new SGSN by using a PDP bearer setup message or a new message, and the new SGSN transmits the new RID to the former SGSN; after the first SGSN receives, the new RID is received.
  • the former GGSN transmits the saved peer information to the new SGSN, and the new SGSN searches for the address information of the gateway accessed by the communication peer according to the AID of the communication peer in the peer information of the received terminal. And sending an RID update notification to the gateway accessed by the communication peer.
  • the foregoing handover method may further include: the pre-SGSN transmitting a forwarding relocation completion certificate to the new SGSN
  • the address information of the former GGSN is transmitted to the new SGSN
  • the new SGSN transmits the address information of the former GGSN to the new GGSN when the PDP bearer of the terminal is established with the new GGSN, and the new GGSN acquires the former GGSN.
  • the forwarding channel of the terminal is established with the former GGSN.
  • the packet sent by the front GGSN to the terminal is forwarded to the new GGSN through the forwarding channel, and the new GGSN is sent to the new SGSN.
  • Target wireless side network element When the real message or the relocation request is forwarded, the address information of the former GGSN is transmitted to the new SGSN, and the new SGSN transmits the address information of the former GGSN to the new GGSN when the PDP bearer of the terminal is established with the new GGSN, and the new GGSN acquires
  • the foregoing handover method may further include: after receiving the peer information transmitted by the former GGSN, the new GGSN checks the AID of the communication peer end in the data message sent by the GGSN to the terminal, if a new communication peer and/or is found.
  • the RID updates the unsuccessful communication peers, sends and/or retransmits the RID update notification to the gateways accessed by the communication peers, and registers the new communication peer AIDs into the peer information of the terminal.
  • the foregoing handover method may also have the following features:
  • the terminal handover procedure involving the inter-SGSN service radio network subsystem (SRNS) relocation refers to the joint hard handover of the PS domain and the relocation process of the terminal across the SGSN, or refers to the joint cell/ The process of URA and service RNS relocation.
  • SRNS inter-SGSN service radio network subsystem
  • the foregoing switching method may also have the following characteristics: the step of the front SGSN or the new SGSN searching for the address information of the gateway accessed by the communication peer according to the AID of the communication peer end in the peer information of the terminal is based on the communication peer end of the terminal
  • the AID queries the address information of the gateway accessed by the communication peer from the local configuration or communication partner's home registration server (HLR/HSS) or DNS server or ILR; when the queried communication peer access gateway is the SGSN
  • the GGSN updates the saved RID in the AID-RID mapping information of the terminal to the new RID; when the queried gateway of the communication peer is the SGSN, the SGSN receives After the RID update notification, the RID update notification is also sent to the GGSN accessed by the communication peer; after receiving the notification, the GGSN updates the RID in the saved AID-RID mapping information to the new RID.
  • the foregoing handover method may further include: in a routing area update process initiated by the terminal in the relocation completion process, the subscription register (HLR/HSS) to which the terminal belongs updates the GGSN address accessed by the terminal to the address of the new GGSN.
  • HLR/HSS subscription register
  • the foregoing handover method may further include: determining, by the new SGSN, whether to select a new GGSN according to the location information of the terminal and/or the network configuration information. If the new SGSN and the front SGSN are connected to different GGSNs on the physical connection, determining that the new SGSN needs to select a new one. GGSN; if new SGSN and former SGSN When the same multiple GGSNs are connected, the new SGSN makes a selection decision according to the location area of the terminal and/or the APN.
  • the foregoing handover method may also have the following features: if the new GGSN selects the new GGSN as the GGSN to be accessed after the relocation, the pre-SGSN passes the relocation request message sent to the new SGSN in the relocation preparation process, or through relocation. The forwarding relocation completion confirmation message sent to the new SGSN during the completion process, or the new terminal information is transmitted to the new SGSN through the newly added message.
  • the foregoing switching method may also have the following features:
  • the new communication peer or the communication pair to be deleted is discovered by the flow real-time detection mechanism and/or checking the AID in the data file of the terminal.
  • the AID of the new communication peer is registered in the peer information of the terminal, and the AID of the communication peer to be deleted in the peer information is deleted.
  • the AID of the newly discovered communication peer is registered in the peer information of the terminal through the real-time flow detection mechanism and/or the AID in the data packet of the terminal.
  • the AID of the communication peer to be deleted is deleted from the peer information.
  • the present invention also provides a WCDMA core network, including a gateway GPRS node.
  • GGSN Serving GPRS Node
  • HLR/HSS Home Subscriber Register
  • ILR Identity Location Register
  • the SGSN is configured to: select a GGSN in a terminal hand-in process involving a relocation of an inter-SGSN serving radio network subsystem (SRNS), and establish a local SGSN for the handover terminal when the new gateway GPRS node (GGSN) is selected PDP bearer between new GGSNs and transmits the AID of the terminal to the new GGSN;
  • SRNS inter-SGSN serving radio network subsystem
  • the GGSN is configured to allocate a new location identifier (RID) to the hand-in terminal, and save mapping information between the identity identifier (AID) of the hand-in terminal and the new RID;
  • RID new location identifier
  • AID identity identifier
  • the GGSN or the SGSN is further configured to: send an RID registration request to the ILR to which the terminal is located, and carry the new RID of the handover terminal, so that the ILR to which the handover terminal belongs updates the RID of the handover terminal saved.
  • the SGSN can include:
  • Cutting out the control module which can be set to: Serve the Wireless Network Subsystem (SRNS) between the SGSNs
  • SRNS Wireless Network Subsystem
  • the relocation request is sent to the new SGSN, and after receiving the forwarding relocation complete message sent by the new SGSN, Responding to the new SGSN to forward the relocation complete confirmation message;
  • SRNS Wireless Network Subsystem
  • the cut-in control module is configured to: after receiving the forwarding relocation request for the handover terminal or forwarding the relocation completion confirmation message sent by the pre-SGSN in the handover process involving the inter-SGSN serving radio network subsystem (SRNS) relocation Selecting the GGSN, and, when the new GGSN is selected, establishing a PDP bearer between the SGSN and the new GGSN for the hand-in terminal, and transmitting the AID of the hand-in terminal to the new GGSN;
  • SRNS radio network subsystem
  • a packet forwarding module configured to forward the data message of the cut-in terminal and the cut-out terminal between the GGSN and the radio side network element;
  • the GGSN may include: a cut-out control module, which may be configured to release resources allocated for the cut-out terminal after the terminal is cut out;
  • the PIM control module is configured to: after receiving the forwarding relocation request sent by the former SGSN and the AID of the hand-in terminal transmitted by the new SGSN, calling the RID allocation module to establish a PDP bearer with the new SGSN for the hand-in terminal;
  • a RID allocation module which can be configured to be a new RID assigned to the GGSN by the handover terminal, and save mapping information of the handover terminal AID and the new RID;
  • a packet forwarding module which can be configured to forward and process data packets that are cut into the terminal and cut out from the terminal.
  • the SGSN may further include an RID registration module, and the RID registration module of the SGSN may be configured to: send a registration request to the identity location register (ILR) to which the terminal is located, carrying the AID of the handover terminal and the new RID; the handover control module of the GGSN may also It is configured to transmit the new RID allocated for the cut-in terminal to the new SGSN; the hand-in control module of the SGSN may also be configured to invoke the RID registration module of the SGSN after receiving the new RID; or the GGSN may further include an RID registration module.
  • ILR identity location register
  • the RID registration module of the GGSN may be configured to: send a registration request to the identity location register (ILR) to which the terminal is located, carrying the AID of the hand-in terminal and the new RID; the hand-in control module of the GGSN may also be configured to obtain a new RID of the hand-in terminal. The RID registration module of the GGSN is then called.
  • ILR identity location register
  • the SGSN may further include a peer information maintenance module, and the peer information maintenance module may be configured to: The peer information of the terminal, the peer information including the correspondence relationship between the AID of the terminal and the AID of the communication peer of the terminal;
  • the cut-out control module of the SGSN may be further configured to: during the handover process, transmit the peer information of the cut-out terminal to the new SGSN, and notify the peer information maintenance module to stop maintaining the peer information of the cut-out terminal;
  • the SGSN of the SGSN may be configured to: receive the peer information of the hand-in terminal transmitted by the SGSN, and notify the peer information maintenance module of the SGSN to save and maintain the peer information of the switch terminal;
  • the SGSN may further include an RID update module, and the RID update module of the SGSN may be configured to: find an address of the gateway accessed by the communication peer according to the AID of the communication peer end in the peer information of the cut-in terminal or the cut-out terminal, to the communication pair
  • the gateway accessing the terminal sends an RID update notification, carrying the AID and the new RID of the cut-in terminal or the cut-out terminal.
  • the SGSN's hand-in control module is further configured to: after receiving the new RID sent by the new GGSN, transmitting the new RID to the former SGSN by forwarding the relocation response message;
  • the cut-out control module of the SGSN may be further configured to: after receiving the new RID of the cut-out terminal transmitted by the new SGSN, calling the RID update module to initiate the RID update to the peer end by the cut-out terminal; and confirming by forwarding re-location Transmitting or transmitting an SRNS context message or a new message to transmit the peer information of the cut-out terminal to the new SGSN;
  • the hand-in control module of the SGSN may be configured to select the GGSN after receiving the forward relocation request for the hand-in terminal sent by the previous SGSN.
  • the cut-out control module of the SGSN may be further configured to: after receiving the forwarding relocation response message returned by the new SGSN, complete the verification message by forwarding the relocation or forward the SRNS context message or the new message, and the peer end of the cut-out terminal to be maintained Information is transmitted to the new SGSN;
  • the hand-in control module of the SGSN may be configured to select the GGSN after receiving the forwarding relocation request for the hand-in terminal sent by the previous SGSN; the hand-in control module of the SGSN may also be configured to: after receiving the peer information of the hand-in terminal transmitted by the former SGSN Calling the RID update module initiates RID update to the peer end for the cut-in terminal.
  • the GGSN may further include a peer information maintenance module, and the peer information maintenance module of the GGSN may be configured. And maintaining the peer information of the terminal, where the peer information includes the correspondence relationship between the AID of the terminal and the AID of the communication peer of the terminal;
  • the cut-out control module of the GGSN may also be configured to transmit the peer information of the cut-out terminal to the new GGSN during the handover process;
  • the GGSN cut-in control module may be further configured to: receive the peer information of the cut-in terminal transmitted by the GGSN, and notify the GGSN of the peer information maintenance module to save and maintain during the handover process;
  • the GGSN may further include an RID update module, and the RID update module may be configured to search the RID of the communication peer according to the AID of the communication peer end in the peer information of the cut-in terminal or the cut-out terminal, and access the gateway to the communication peer end.
  • the GGSN's hand-in control module may be further configured to: after the RID distribution module allocates a new RID for the hand-in terminal, send a message request to the forward GGSN through the new SGSN and the front SGSN; and, upon receiving the transmitted peer-end terminal information After that, the RID update module is invoked to initiate an RID update to the peer end for the cut-in terminal;
  • the cut-out control module of the GGSN may be further configured to: after receiving the information request sent by the former GGSN, advance the peer information of the cut-out terminal and/or the AID-RID mapping information of the communication peer of the cut-out terminal.
  • the SGSN and the new SGSN are transmitted to the new GGSN.
  • the hand-in control module of the GGSN may also be configured to transmit the new RID allocated for the hand-in terminal to the front GGSN;
  • the GGSN cut-out control module may be further configured to: after receiving the new RID of the cut-out terminal transmitted by the new GGSN, call the RID update module to initiate the RID update to the peer end by the cut-out terminal, and after the update is completed, the maintenance will be performed.
  • the peer information of the cut-out terminal and/or the AID-RID mapping information of the communication peer of the cut-out terminal are transmitted to the new GGSN.
  • the cut-out control module of the GGSN may be further configured to: when establishing a forwarding channel with the new GGSN or after the forwarding channel is established, mapping the peer end information of the cut-out terminal and/or the AID-RID of the communication peer end of the cut-out terminal Information is transmitted to the new GGSN;
  • the hand-in control module of the GGSN may also be configured to, after receiving the peer information of the hand-in terminal transmitted by the previous GGSN, invoke the RID update module to initiate an RID update to the peer end for the hand-in terminal.
  • the GGSN cut-out control module may be further configured to: during the handover process, transmit the AID-RID mapping information of the communication peer end of the service cut-out terminal to the new GGSN;
  • the GGSN may further include a mapping information maintenance module, and the mapping information maintenance module may be configured to: in the handover process, after receiving the data file of the handover terminal, locally maintain the AID-RID mapping information of the communication peer end of the handover terminal, and The received AID-RID mapping information of the communication peer end of the hand-in terminal transmitted by the former GGSN is merged with the locally maintained AID-RID mapping information;
  • the handover control module of the GGSN may be further configured to: receive, during the handover process, the AID-RID mapping information of the communication peer end of the handover terminal transmitted by the GGSN, and notify the mapping information maintenance module of the SGSN to save the received mapping information and maintain.
  • the packet forwarding module of the GGSN may be configured to forward the data packet by forwarding the received data packet sent to the cut-out terminal to the former SGSN, and forwarding the received data packet sent to the cut-in terminal to the new packet.
  • SGSN or
  • the GGSN may further include a forwarding channel establishing module, where the forwarding channel establishing module may be configured to: establish a forwarding channel between the GGSN and the original GGSN for the hand-in terminal during the handover process, or establish a relationship between the GGSN and the new GGSN for the cut-out terminal
  • the forwarding channel of the GGSN may be configured to forward the data packet by receiving the data packet sent to the cut-out terminal, sending the data packet to the former GGSN, and receiving the data packet. After the data packet of the terminal is forwarded to the new SGSN via the forwarding channel;
  • the packet forwarding module of the SGSN may be configured to forward the data packet by: forwarding the received data packet sent to the cut-out terminal to the source radio side network element, and sending the received data to the cut-in terminal. The packet is forwarded to the target wireless side network element.
  • the hand-in control module of the SGSN may be configured to select the GGSN after receiving the forwarding relocation request for the hand-in terminal sent by the previous SGSN; the hand-in control module of the SGSN may also be configured to: transmit the address information of the new GGSN to the forwarding relocation response to The SGSN may also be configured to transmit the received address information of the new GGSN to the former GGSN.
  • the GGSN may further include a forwarding channel establishing module, and the forwarding channel establishing module may be configured to: receive the pre-SGSN transmission After the address information of the new GGSN, interact with the new GGSN to establish a forwarding channel for cutting out the terminal from the new GGSN; or
  • the SGSN's hand-in control module may be configured to select the GGSN after receiving the forwarding relocation request for the hand-in terminal sent by the previous SGSN; the SGSN's hand-out control module may also be configured to: when sending the forwarding relocation request to the new SGSN, The address information of the former GGSN is transmitted to the new SGSN; the hand-in control module of the SGSN may be further configured to transmit the received address information of the former GGSN to the new GGSN when establishing the PDP bearer of the terminal with the new GGSN; the GGSN may further include a forwarding channel establishment.
  • the module, the forwarding channel establishing module may be configured to, after receiving the address information of
  • the cut-out control module of the SGSN may be further configured to: when sending the forwarding relocation completion confirmation message or forwarding the relocation request to the new SGSN, transmitting the address information of the former GGSN to the new SGSN; the handover control module of the SGSN may also be configured to be in The new GGSN transmits the address information of the former GGSN to the new GGSN when the PDP bearer of the terminal is established; the GGSN may further include a forwarding channel establishment module; the handover control module of the GGSN may also be configured to receive the address information of the previous GGSN. Calling the forwarding channel establishment module; the forwarding channel establishment module of the GGSN is configured to interact with the former GGSN to establish a forwarding channel for the handover terminal.
  • the peer information maintenance module of the GGSN may be further configured to: after saving the peer information of the hand-in terminal transmitted by the GGSN, check the AID of the communication peer end in the data message sent by the previous GGSN to the hand-in terminal, if found
  • the new communication peer or RID updates the unsuccessful communication peer, registers the new communication peer or the AID of the unsuccessful communication peer to the peer information of the cut-in terminal, and performs the cut-in control to the GGSN.
  • the module sends an update notification, carrying the new communication peer or the RID to update the AID of the unsuccessful communication peer;
  • the handover control module of the GGSN may be further configured to, after receiving the update notification sent by the peer information maintenance module, invoke the RID update module to send or re-send to the gateway of the new communication peer or the RID update unsuccessful communication peer access. Send a RID update notification.
  • the terminal handover procedure involving the inter-SGSN Serving Radio Network Subsystem (SRNS) relocation may refer to a joint hard handover of a PS domain and a relocation procedure of a terminal across an SGSN, or may refer to a joint cell/URA and a serving RNS relocation. process.
  • SRNS Inter-SGSN Serving Radio Network Subsystem
  • the RID update module of the GGSN may be configured to find the address information of the gateway accessed by the communication peer by: selecting the home subscriber subscription server (HLR/HSS) or the DNS server from the local configuration or communication peer according to the AID of the terminal communication peer. Or ILR queries the gateway to which the communication peer accesses Address information.
  • HLR/HSS home subscriber subscription server
  • ILR queries the gateway to which the communication peer accesses Address information.
  • the handover control module of the SGSN may be further configured to determine whether to select a new GGSN according to the location information of the terminal and/or the network configuration information. If the SGSN is connected to a different GGSN as a new SGSN and the former SGSN, the new selection is determined. GGSN; if the SGSN is connected to the same multiple GGSNs as the new SGSN and the former SGSN, it is determined whether to select a new GGSN according to the location area of the terminal and/or the APN.
  • the peer information maintenance module of the SGSN or the GGSN may be configured to maintain the peer information by: registering the discovered AID of the new communication peer to the AID through the flow real-time detection mechanism and/or by checking the AID in the data packet of the terminal.
  • the AID of the communication peer to be deleted is deleted from the peer information of the terminal.
  • the above-mentioned WCDMA core network-based handover method and the corresponding WCDMA core network can support the terminal identity and location separation in addition to handover, thereby avoiding route bypass. Moreover, in some embodiments, it may be based on the existing relocation process as much as possible, without affecting the consistency of the existing relocation process, and has good feasibility.
  • Figure la is an architectural diagram of a packet domain of an existing WCDMA system
  • Figure lb is an architectural diagram of an existing WCDMA single tunnel system
  • FIG. 2a is a schematic diagram of joint hard handover and SRNS relocation and routing area update
  • FIG. 2b is a schematic diagram of joint hard handover and SRNS relocation and routing area update
  • FIG. 3a and FIG. 3b are joint hard handover of existing PS domain.
  • Figure 4a is a schematic diagram of a SILSN network architecture
  • FIG. 4b is a schematic diagram of a format of a data packet in the SILSN architecture shown in FIG. 4a;
  • FIG. 5 is a schematic diagram of a WCDMA core network architecture 1 with a SILSN architecture according to the present invention
  • 6 is a schematic diagram of a WCDMA core network architecture 2 with a SILSN architecture according to the present invention
  • FIG. 7 is a schematic diagram of a WCDMA core network architecture 3 having a SILSN architecture according to the present invention
  • FIG. 8 is a schematic flowchart of a handover method according to Embodiment 1 of the present invention
  • FIG. 9 is a schematic flowchart of a handover method according to Embodiment 2 of the present invention.
  • FIG. 10 is a schematic flowchart of a handover method according to Embodiment 3 of the present invention.
  • FIG. 11 is a schematic flowchart of a handover method according to Embodiment 4 of the present invention.
  • FIG. 12 is a schematic flowchart diagram of a handover method according to Embodiment 5 of the present invention.
  • the invention applies the above SILSN architecture to a WCDMA system to realize no fixed 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 notification may be sent to the gateway accessed by the communication peer.
  • the source ASN may also forward the peer information of the terminal and/or the AID-RID mapping information of all communication peers to the target ASN.
  • the source ASN needs to forward the packet sent by the communication peer to the target ASN.
  • FIG. 5-7 The architecture of three WCDMA core networks with SILSN architecture is shown in Figures 5-7: Architecture 1.
  • the signaling interface between the SGSN and the ILR is used to register and deregister the RID of the terminal.
  • the GGSN assigns a RID to the terminal.
  • the GGSN and the ILR also have a signaling interface for querying the ILR for the RID of the communication peer. As shown in Figure 5.
  • the GGSN allocates a RID to the terminal, and the GGSN and the ILR have a signaling interface for registering with the ILR, deregistering the RID of the terminal, and querying the RID of the communication peer.
  • the SGSN and the ILR have a signaling interface for registering with the ILR, deregistering the RID of the terminal, and querying the RID of the communication peer.
  • the GGSN allocates a RID to the terminal, and there is no direct signaling interface with the ILR.
  • the SGSN queries the ILR for the RID of the communication peer.
  • the RID is allocated by the GGSN, the AID-RID mapping information of the communication peer end of the terminal is maintained, the RID encapsulation and the RID encapsulation of the data packet are performed, and the packets between the GGSNs are forwarded through the generalized forwarding plane (which can support RID routing and Forwarded packet data network implementation) routing and forwarding.
  • the peer information of the terminal can be maintained on the SGSN and/or GGSN.
  • the division of the above three architectures is not affected. All of the above architectures have problems in how to perform intra-system handover. Switching between SGSNs will result in changes in the SGSN and possible changes in the GGSN.
  • the invention is not limited to the above three architectures. Since the wireless access network may use other architectures, the target RNC may be other wireless side network elements in other architectures.
  • the GGSN no longer needs to be anchored, and the new SGSN can select a new GGSN. According to whether the GGSN changes, the GGSN and the SGSN are changed, and the GGSN is unchanged.
  • the SGSN changes the two scenarios.
  • the first embodiment and the second embodiment are directed to the scenario in which the GGSN is unchanged.
  • the peer information of the terminal is maintained in the SGSN.
  • the former SGSN needs to transmit the peer information of the cut-out terminal to the new SGSN. If the peer information is maintained in the GGSN, the relocation process is the same as the prior art and is not changed.
  • the terminal when a network element is used as the original network element to process the terminal handover, the terminal is called a cut-out terminal.
  • the terminal When a network element is used as the target side network element to process the terminal handover, the terminal is called the cut-in terminal.
  • the network element that is connected to the communication peer of the terminal is simply referred to as the peer network element.
  • the function of a certain network element when expressed, the user terminal accessing the network element is called a terminal, and access The user terminal that the user terminal of the network element communicates is called a communication peer.
  • the WCDMA core network architecture based on this embodiment may be any one of the above three architectures, and the GGSN is unchanged during the relocation process.
  • the SGSN saves and maintains the peer information of the terminal.
  • Former SGSN pass The over-relocation completion process sends a "Forward Relocation Complete Message" message to the new SGSN to deliver the peer information of the terminal.
  • the joint hard handover of the PS domain and the relocation process of the terminal across the SGSN in this embodiment include:
  • Step 801 Steps 301 to 310 of the existing relocation process
  • the new SGSN After receiving the relocation request message sent by the previous SGSN, the new SGSN determines whether it is necessary to select a new GGSN. This embodiment is not required.
  • Step 802 After receiving the RRC message sent by the terminal, such as a physical channel reconfiguration complete message or a radio bearer release complete message, the target RNC sends a relocation complete message to the new SGSN, and the step is the same as the step 311 of the existing relocation process;
  • Step 803 The new SGSN sends a Forwarding Relocation Complete message to the forward SGSN.
  • the Forwarding Relocation Complete message may be the same as the information in the prior art, or may add an indication information to the prior art message.
  • the former SGSN asks for the opposite information.
  • Step 804 After receiving the "Forwarding Relocation Complete Message", the former SGSN carries the peer information of the terminal in the "Forwarding Relocation Complete Confirmation Message" and sends it to the new SGSN.
  • the relocation complete response message may carry the indication information without the peer information.
  • Step 805 The new SGSN initiates a PDP update to the SGSN, and the subsequent process is the same as the prior art.
  • Embodiment 2
  • the WCDMA core network architecture based on this embodiment may be any one of the above three architectures, and the GGSN is unchanged during the relocation process.
  • the SGSN stores the peer information of the terminal.
  • the message sent by the former SGSN to the new SGSN through the relocation preparation process, such as a "Relocation Request Message", delivers the terminal information of the terminal.
  • the joint hard handover of the PS domain and the relocation process of the terminal across the SGSN in this embodiment include:
  • Step 901 The source RNC decides to initiate the handover process, and the same step 301;
  • Step 902 The source RNC sends a relocation request to the SGSN, in the same step 302;
  • Step 903 The front SGSN sends a forwarding relocation request message to the new SGSN, where the message carries the original parameter information and the peer information of the terminal maintained by the former SGSN.
  • Step 904 The new SGSN determines whether a new GGSN needs to be selected, and does not need to be selected in this embodiment. Therefore, the new SGSN sends a relocation request to the target RNC, which is followed by the prior art.
  • the new SGSN can determine whether to select a new GGSN based on the location information and/or network configuration information of the terminal. For example, if the new SGSN and the former SGSN are connected to different GGSNs on the physical connection, the new SGSN selects a new GGSN, and the new SGSN can know the address of the old GGSN from the context. If both the new SGSN and the former SGSN are connected to the same multiple GGSNs, the new SGSN can make a selection decision based on the location area of the terminal and/or the APN. In an example, the new SGSN may select the GGSN that is closest to the terminal and belongs to the same APN according to the LAI or RNC ID of the terminal. Other embodiments are the same.
  • the pre-SGSN transmits the peer information to the new SGSN by using an existing message, but the present invention is not limited thereto, and may also be transmitted by sending a new message to the new SGSN through the pre-SGSN.
  • the peer information of the terminal is not limited thereto, and may also be transmitted by sending a new message to the new SGSN through the pre-SGSN.
  • the following embodiments are directed to the scenario in which the GGSN changes during the relocation process.
  • the processes related to the AID and RID involved include: assigning a new RID to the terminal on the side of the handover, and registering the ILR with the terminal.
  • the new RID of the terminal cuts into one side or cuts out the side to initiate RID update to the peer gateway (such as GGSN, or possibly border gateway such as ISN).
  • the cut-out side transmits the opposite end information of the terminal to the cut-in side.
  • the forwarding of the packet sent from the side to the handover side to the communication peer can be implemented by the existing method in FIG. 3a, 3b, or by the forwarding tunnel between the GGSNs.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • the architecture of the WCDMA core network based on this embodiment is the foregoing architecture 1 and architecture 3.
  • the GGSN is changed during the relocation process, and the RID of the registered terminal is updated by the SGSN to the ILR, and the peer information of the terminal is maintained and saved, and is cut out from the side. Pass on the cut side.
  • the joint hard handover of the PS domain and the relocation process of the terminal across the SGSN and the GGSN in this embodiment include:
  • Steps 1001-1003 the same steps 301-303; Step 1004: The new SGSN receives the relocation request message. If a new GGSN is selected, the PDP bearer of the terminal is established and the AID of the terminal is transmitted to the new GGSN, and the new GGSN allocates a new RID to the terminal.
  • the new GGSN may send a new RID to the terminal, or after receiving the RAB of the terminal by the new SGSN and the target RNC, send a message sent to the new SGSN, such as a new message, to the terminal home ILR. Registration request (belonging to update registration). Accordingly, the new GGSN does not have to transmit the new RID to the new SGSN, and it is not necessary to perform step 1006.
  • Step 1005 The new SGSN interacts with the target RNC to establish the RAB of the terminal, and the same step 304;
  • Step 1006 The new SGSN sends a RID registration request to the terminal home ILR, carrying the AID of the terminal and the new RID;
  • the ILR After receiving the RID registration request, the ILR updates the saved RID in the terminal AID-RID mapping information to the new RID, that is, updates the AID-RID mapping information of the terminal.
  • This step can be performed after step 1004. However, after the establishment of the RAB is successful, the RID registration is initiated, which can avoid the relocation revocation after the RAB establishment fails, and also cancel the update of the RID of the terminal to the ILR.
  • Step 1007 The new SGSN returns a forwarding relocation response message to the SGSN, and carries a new RID allocated for the terminal.
  • the sequence of the RID registration process initiated by the foregoing step 1006 and the step 1007 returning the relocation request response message are not limited in the present invention.
  • Step 1008 After receiving the relocation request response, the front SGSN determines the address of the opposite gateway according to the AID of the communication peer in the peer information of the terminal, and sends an RID update notification to the opposite gateway, carrying the AID and the new terminal of the terminal.
  • RID
  • the SGSN can determine the AID of the peer end of the communication terminal from the local configuration or the communication peer end attribution.
  • the HLR/HSS or DNS server or ILR queries the address information of the peer gateway such as SGSN, GGSN, border gateway, and the like. If it is sent to the peer SGSN, the peer SGSN also sends a RID update notification to the corresponding peer GGSN, and after receiving the notification, the peer GGSN will save the terminal. The RID in the AID-RID mapping information is updated to the new RID.
  • the former SGSN After the start of the RID update process to the peer, the former SGSN will send a RID update notification to all the registered and newly registered communication peers to ensure that all the communication peers of the terminal send the packets. Can be routed to the new GGSN.
  • the new communication peer or the communication peer to be deleted may be discovered by using a real-time flow detection mechanism and/or checking an AID in the data packet of the terminal.
  • the AID of the new communication peer is registered in the peer information of the terminal, and the AID of the communication peer to be deleted is deleted from the peer information, and the GGSN is also the same.
  • the former SGSN can stop maintenance after transmitting the peer information to the new SGSN.
  • a packet received during the timer period may be detected and/or checked by triggering a timer, and the re-received packet after the timer expires is discarded. .
  • Step 1009 The front SGSN sends a relocation command message to the source RNC to perform a relocation execution process, and steps 306 to 310;
  • the sequence of the RID update notification sent by the SGSN before the step 1008 and the relocation command sent by the SGSN before the step 1009 are not limited in the present invention.
  • Step 1010 After detecting the RRC message sent by the UE, such as the physical channel reconfiguration complete message or the radio bearer release complete message, the target RNC sends a relocation complete message to the new SGSN, in the same step 311;
  • Step 1011 The new SGSN sends a Forward Relocation Complete message to the SGSN, and the former SGSN returns a Forward Relocation Complete Confirmation message to the new SGSN, in the same step 313;
  • the former SGSN communicates the peer information of the terminal to the new SGSN by forwarding the relocation completion confirmation message, and the new SGSN saves the peer information and performs maintenance.
  • the pre-SGSN may also transmit the peer information to the new SGSN by forwarding an SRNS context message or other new message.
  • Step 1012 After receiving the message, the SGSN notifies the source RNC to release the Iu interface, and notifies the former GGSN to delete the related bearer.
  • the former GGSN After receiving the notification of deleting the relevant bearer, the former GGSN also deletes the AID-RID mapping information of the terminal maintained locally, and deletes the AID of the communication peer end that has no communication relationship with the other terminals of the pre-access GGSN in the communication communication peer end. RID mapping information.
  • Step 1013 The route update process is the same as the step 315 of the existing relocation process, but the GGSN address in the HLR/HSS may be updated to the address of the new GGSN. If the HLR saves the RID information of the terminal, the RID may also be added to the terminal. Update of information.
  • the data forwarding path in the handover process of this embodiment may be the same as that in the prior art.
  • the downlink packet received by the former GGSN passes through the pre-SGSN to the source RNC, and then forwarded to the terminal through the forwarding channel between the source RNC and the target RNC.
  • the former SGSN may also obtain the AID-RID mapping information of all communication peers of the terminal from the former GGSN, and transmit the confirmation message to the new SGSN through a message with the new SGSN, such as forwarding relocation, which may be transmitted together with the peer information. .
  • the new SGSN then sends the AID-RID mapping information to the new GGSN for saving through the PDP bearer setup message or the new message.
  • the terminal communicates with the external packet data network through the target RNC, the new SGSN, and the new GGSN, and the new GGSN performs packet RID encapsulation, decapsulation, and forwarding, thereby implementing switching without fixed anchor points, which can be avoided. Route bypass.
  • the RID update notification is sent by the new SGSN, and there are several ways:
  • step 1003 the former SGSN transmits the peer information of the terminal to the new SGSN by forwarding the relocation request message, and the new SGSN saves the peer information.
  • step 1007 the new SGSN does not carry the new RID allocated to the terminal when forwarding the relocation response message to the SGSN.
  • the RID update notification needs to be sent to the opposite gateway according to the saved peer information.
  • the former SGSN may continue to perform real-time flow detection after transmitting the peer information, and notify the new SGSN of the AID of the newly discovered communication peer.
  • the detection may end when a forward relocation response message is received or after a certain delay.
  • step 1007 the new SGSN does not carry the new RID allocated to the terminal when returning the forward relocation response message to the forward SGSN;
  • the former SGSN After receiving the forwarding relocation response message, the former SGSN forwards the verification message through the original process message, such as forwarding relocation, forwards the SRNS context message, or transmits the peer information of the terminal to the new SGSN by adding a new message. After receiving the SGSN, the SGSN initiates an RID update to the peer.
  • the newly added communication peer sends the downlink message to the new GGSN, and the former SGSN does not have to The message was detected or checked.
  • the peer information is maintained in the GGSN.
  • the new GGSN allocates a new RID to the terminal.
  • the new SGSN and the former SGSN send information requests to the GGSN.
  • the GGSN transmits the peer information of the terminal to the new GGSN via the former SGSN and the new SGSN.
  • the new GGSN registers with the ILR, it may receive the packet of the terminal.
  • the new GGSN allocates a new RID to the terminal, the new GGSN maintains the peer information of the terminal according to the received packet of the terminal (such as detection).
  • the new communication peer may query from the ILR to the new RID), and after receiving the transmitted peer information, it will receive and local.
  • the peer information of the terminal is merged.
  • the foregoing SGSN may also be transmitted to the new SGSN by AID-RID mapping information (including peer information) of the terminal communication end, or both the peer information and the AID-RID mapping information of the terminal communication peer.
  • AID-RID mapping information including peer information
  • the above information can be directly communicated through the signaling interface between the GGSNs.
  • This embodiment can be applied to the above architecture 1 and architecture 3, and the GGSN changes during the relocation process.
  • the GGSN maintains the peer information and the RID update initiated to the peer end, and establishes a forwarding channel between the front GGSN and the new GGSN through the signaling interface between the GGSNs, and uses the forwarding channel to forward the downlink data packet of the terminal in the handover process.
  • the joint hard handover of the PS domain and the relocation process of the terminal across the SGSN and the GGSN in this embodiment include:
  • Steps 1101-1303 steps 301 ⁇ 303 of the existing relocation process
  • Steps 1104 to 1107 In the same steps 1004 to 1007, the new SGSN selects a new GGSN for the terminal, and the new GGSN interacts with the PDP bearer of the terminal and transmits the AID of the terminal to the new GGSN, and the new GGSN allocates a new RID to the terminal. And transmitting the new RID to the new SGSN; the new SGSN interacts with the target RNC to establish the RAB of the terminal, registers the new RID of the terminal with the ILR, and transmits the new RID to the former SGSN by forwarding the relocation request response message. ;
  • the new RID of the terminal is registered with the ILR.
  • Step 1108 The former SGSN sends a signaling to the GGSN, and notifies the terminal that the RID is updated, and carries the AID of the terminal and the new RID.
  • the former GGSN After receiving the signaling, the former GGSN establishes a forwarding channel of the terminal with the new GGSN, according to the The peer information of the terminal is sent to the peer gateway to send a RID update notification, and the peer information of the terminal and/or the AID-RID mapping information of the communication peer of the terminal is transmitted to the new GGSN;
  • the former GGSN can obtain the address information of the new GGSN according to the new RID, thereby establishing a forwarding channel with the new GGSN.
  • the former GGSN or the new GGSN maintains the peer information of the terminal and the AID-RID mapping information of the communication peer of the terminal, so that the RID of the communication peer can be directly found locally, and the address information of the peer gateway such as the GGSN is obtained.
  • the peer GGSN may also transmit the peer information of the terminal and/or the AID-RID mapping information of the communication peer of the terminal to the new GGSN, such as signaling that the former GGSN sends to the new GGSN when establishing the forwarding channel.
  • the new GGSN may initiate an RID update procedure to the corresponding peer gateway according to the AID of the communication peer in the transmitted peer information.
  • the new GGSN allocates the RID to the terminal, it can start to maintain the peer information of the terminal by checking the terminal's message, etc., and after receiving the peer information transmitted by the previous GGSN, the received and local will be received.
  • the peer information of the terminal is merged.
  • the AID-RID mapping information of the terminal communication end can be transmitted together with the connection information, or can be separately maintained by the former GGSN and the new GGSN, and processed by the new GGSN.
  • the forward GGSN is established with the forwarding channel of the new GGSN
  • the packet sent by the former GGSN to the terminal is directly forwarded to the new GGSN.
  • the new GGSN sends the packet to the target RNC.
  • the former GGSN transmits the peer information. It can be encapsulated by the former GGSN RID, and the peer information is maintained. Then, the new GGSN can be used to solve the RID encapsulation and maintain the peer information.
  • the data packet sent by the new GGSN to the terminal is sent to the target RNC through the new SGSN. It is no longer necessary to forward data to the target RNC through the source RNC.
  • the data packet sent by the terminal is forwarded to the generalized forwarding plane by the source RNC, the former SGSN, and the front GGSN before being switched to the target RNC, and then forwarded to the target RNC, the new SGSN, and the new GGSN after being switched to the target RNC. .
  • the former GGSN triggers a timer after receiving the foregoing signaling, and all registered and newly registered communication peers before the timer expires, the former SGSN will send a RID update notification to the gateway to which it accesses.
  • Step 1109 Basically, the relocation execution process of the existing relocation process is only used to forward data between the GGSNs, and the source RNC does not need to forward data to the target RNC.
  • Steps 1110-1111, steps 311-312 of the existing relocation process are Steps 1110-1111, steps 311-312 of the existing relocation process.
  • Step 1112 In the same step 1012, the front SGSN and the front GGSN release the related resources.
  • Step 1113 In the same step 1013, the route update process is performed, and the GGSN address in the HLR/HSS is updated to be the address of the new GGSN, and the RID information of the terminal may also be increased. Update.
  • the above process of the fourth embodiment may have other variations, such as:
  • This variant differs from the above procedure in establishing a forwarding channel between GGSNs.
  • the former SGSN transmits the address information of the former GGSN to the new SGSN
  • the new SGSN transmits the address information when establishing the PDP bearer of the terminal with the new GGSN.
  • the new GGSN obtains the address information of the former GGSN
  • the new GGSN establishes a forwarding channel of the terminal with the former GGSN.
  • the former SGSN does not need to transmit the new RID to the former GGSN, nor does it need to send signaling, and informs the former GGSN that the terminal RID has been updated.
  • the new GGSN initiates an update registration to the ILR, the new GGSN does not need to transmit the new RID to the new SGSN.
  • the new GGSN may send the AID of the communication peer in the data message sent by the GGSN to the terminal, such as discovering the new communication peer or the RID update unsuccessful communication peer, and sending the gateway to the communication peer. Or resend the RID update notification to ensure that the peer can successfully update.
  • the AID of the new communication peer is also registered in the peer information of the terminal.
  • the downlink data packet received by the former GGSN can be forwarded to the new GGSN, and the new GGSN is used to solve the RID encapsulation. This is also applicable to the flow of the fourth embodiment.
  • the data can be simultaneously used.
  • the method for establishing a forwarding channel between the GGSNs in the fourth embodiment and its variants establishes a forwarding channel between the former GGSN and the new GGSN, and the manner of transmitting the peer information and updating the RID is the same as that in the third embodiment, and the downlink data is The forwarding is the same as in the fourth embodiment.
  • the GGSN is changed, and the AID and RID related processing is performed in the relocation completion process.
  • the joint hard handover of the PS domain and the relocation process of the terminal across the SGSN and the GGSN in this embodiment include:
  • Steps 1201-1210 steps 301 ⁇ 310 of the existing relocation process
  • Step 1211 In step 311 of the existing relocation process, the terminal sends an RRC message, such as a physical channel reconfiguration complete message or a radio bearer release complete message, to the target RNC, and the target RNC sends a relocation complete message to the new SGSN to initiate a relocation complete process. ;
  • RRC message such as a physical channel reconfiguration complete message or a radio bearer release complete message
  • Step 1212 The new SGSN sends a forward relocation complete message to the forward SGSN.
  • Step 1213 The front SGSN forwards the relocation complete confirmation message to the new SGSN.
  • the front SGSN carries the peer information of the terminal and/or the AID-RID mapping information of the terminal communication end in the relocation complete confirmation message. Sended to the new SGSN, the former SGSN can obtain the above information from the former GGSN.
  • Step 1214 After receiving the relocation completeing confirmation message, the new SGSN selects a new GGSN for the terminal, establishes a PDP bearer of the terminal with the new GGSN, and transmits the AID of the terminal to the new GGSN, where the new GGSN is the terminal. Allocate a new RID and transfer it to the new SGSN; Based on the architecture 2, the new GGSN sends a registration request to the terminal home ILR; based on the architecture 1 and the architecture 3, the SGSN sends a registration request to the terminal home ILR.
  • the new SGSN saves the received peer information and maintains it. If the new SGSN receives the mapping information of the peer communication peer, it needs to send it to the new GGSN for storage, such as by carrying the established message or the newly added message.
  • Step 1215 The new SGSN sends a request for updating the peer information to the SGSN, and carries the new RID of the terminal.
  • Step 1216 After receiving the new RID, the SGSN initiates an RID update process to the peer end, and the same step 1008;
  • the peer information may be reserved locally at the same time, and the peer information is deleted after the RID update to the peer end is completed. Of course, in step 1213, the peer information may not be transmitted. After the RID update process to the peer end is completed in step 1216, the peer end information of the terminal is transmitted to the new SGSN, and the message is transmitted by updating the response message of the peer information request.
  • Step 1217 Before the SGSN informs the GGSN to delete the related bearer, and notify the source RNC to release the Iu port, as in step 1012.
  • Step 1218 The route update process is the same as step 1013.
  • the above process of the fifth embodiment may have other variations, such as:
  • the new SGSN may first select a new GGSN for the terminal, and establish a PDP bearer of the terminal with the new GGSN. .
  • the new SGSN no longer performs the GGSN selection and the process of establishing the PDP bearer, and the other embodiments are the same as the above fifth embodiment and other variants.
  • the new GGSN forwards the GGSN, or the new SGSN requests the opposite SGSN to the peer information, and after receiving the opposite information, the data is received.
  • the AID of the communication peer in the received peer information determines the address of the peer gateway, and sends an RID update notification to the peer gateway.
  • the peer information is maintained on the GGSN.
  • the pre-SGSN after receiving the newly allocated RID, the pre-SGSN does not initiate the RID update process, but sends the new RID to the former GGSN.
  • the RGS update process to the peer end is initiated by the former GGSN according to the saved peer information of the terminal, or after the former GGSN transmits the saved peer information to the new SGSN, the new SGSN initiates the RID update process to the peer end.
  • the former GGSN may also establish a forwarding channel with the new GGSN according to the new RID, and forward the packet sent by the communication peer to the terminal in the handover process to the new GGSN.
  • the forward SGSN When the forward SGSN sends a forward relocation complete confirmation message or a previously sent message, such as a forward relocation request, to the new SGSN, the address information of the former GGSN is transmitted to the new SGSN, and the new SGSN establishes the PDP bearer of the terminal with the new GGSN. The address information is transmitted to the new GGSN. After the new GGSN obtains the address information of the former GGSN, the forwarding channel of the terminal is established with the former GGSN.
  • the new GGSN can transfer the new RID to the front.
  • the GGSN transmits the message through the forwarding channel establishment process.
  • the former GGSN After receiving the new RID, the former GGSN initiates the RID update to the peer end, and transmits the peer information of the terminal maintained by the former GGSN to the new GGSN.
  • the peer information of the terminal (and/or the AID-RID mapping information of the terminal communication peer) that is to be maintained by the former GGSN is transmitted to the new GGSN, such as the message carried in the tunnel establishment process, and the new GGSN is based on the peer information.
  • the new GGSN can learn the newly added communication peers and the communication peers whose RID update is unsuccessful by checking the data packets sent to the terminal forwarded by the GGSN, and send and re-route to the gateways accessed by the communication peers. Send a RID update notification.
  • the joint hard handover with the PS domain and the relocation procedure of the terminal across the SGSN are different from the radio side, and thus the description of the above embodiment is not affected. Therefore, the handover mentioned in the present invention may be based on joint hard handover of the PS domain and relocation procedure of the terminal across the SGSN, and may also be based on the process of joint cell/URA and service RNS relocation.
  • the present invention also provides a WCDMA core network, including a Gateway GPRS Node (GGSN), a Serving GPRS Node (SGSN), a Home Subscriber Register (HLR/HSS), and an Identity Bit. Set register (ILR), where:
  • the SGSN is configured to select the GGSN during the terminal hand-in process involving the inter-SGSN serving radio network subsystem (SRNS) relocation.
  • SRNS radio network subsystem
  • the GGSN is configured to allocate a new location identifier (RID) to the terminal, and save mapping information of the terminal identity (AID) and the new RID;
  • RID new location identifier
  • the GGSN or SGSN is further configured to send a RID registration request to the handover terminal home ILR, carrying the new RID, so that the home ILR of the terminal updates the saved RID of the terminal.
  • the RID registration, the RID update, the maintenance and delivery of the peer information, the maintenance of the mapping information, and the establishment of the GGSN tunnel can be used in any combination, and the corresponding GGSN and SGSN can be used.
  • the function modules are listed below, and special scenes are limited.
  • the SGSN includes:
  • the cut-out control module is configured to: after receiving a relocation request for the cut-out terminal sent by the source radio side network element in the handover process involving the inter-SGSN serving radio network subsystem (SRNS) relocation, to the new SGSN Sending a forwarding relocation request, and, after receiving the forwarding relocation complete message sent by the target SGSN, replying to the target SGSN with a forwarding relocation complete confirmation message;
  • SRNS inter-SGSN serving radio network subsystem
  • a cut-in control module configured to select, after receiving a forwarding relocation request for a hand-in terminal or a forwarding re-location completion confirmation message sent by the former SGSN, in a handover process involving an inter-SGSN serving radio network subsystem (SRNS) relocation GGSN, and when a new GGSN is selected, a PDP bearer between the SGSN and the new GGSN is established for the hand-in terminal, and the AID of the hand-in terminal is transmitted to the new GGSN;
  • SRNS radio network subsystem
  • a packet forwarding module configured to forward the data message of the cut-in terminal and the cut-out terminal between the GGSN and the wireless side network element;
  • the GGSN includes:
  • Cutting out the control module which is configured to release the resources allocated for the cut-out terminal after the terminal is cut out;
  • the cut-in control module is configured to: forward the relocation request and the new one sent before the SGSN is received After the SGSN transmits the AID of the terminal, the RID allocation module is invoked to establish a PDP bearer with the new SGSN for the hand-in terminal;
  • a RID allocation module configured to be a new RID assigned to the GGSN by the handover terminal, and storing mapping information of the handover terminal AID and the new RID;
  • the packet forwarding module is configured to forward the data packet that is cut into the terminal and cut out the terminal.
  • the SGSN further includes an RID registration module, the RID registration module is configured to: send a registration request to the handover terminal home identity register (ILR), carry the AID of the handover terminal and a new RID; the handover control module of the GGSN is further configured to Transmitting a new RID assigned to the cut-in terminal to the new SGSN; the hand-in control module of the SGSN is further configured to invoke the RID registration module after receiving the new RID; or
  • the GGSN further includes an RID registration module, the RID registration module is configured to: send a registration request to the cut-in terminal home identity register (ILR), carrying the AID of the hand-in terminal and the new RID; the hand-in control module of the GGSN is further configured to obtain the hand-in terminal
  • the RID registration module is called after the new RID.
  • the SGSN further includes a peer information maintenance module, and the peer information maintenance module is configured to: maintain the peer information of the terminal, and the peer information includes the correspondence information of the terminal AID and the communication peer AID thereof;
  • the cut-out control module of the SGSN is further configured to: during the handover process, transmit the peer information of the cut-out terminal to the new SGSN and notify the peer information maintenance module to stop the maintenance;
  • the SGSN cut-in control module is further configured to: receive the peer information of the cut-in terminal transmitted by the former SGSN, and notify the SGSN of the peer information maintenance module to save and maintain;
  • the SGSN further includes an RID update module, and the RID update module is configured to: find an address of the gateway accessed by the communication peer according to the AID of the communication peer end in the peer information of the cut-in terminal or the cut-out terminal, and access the gateway to the communication peer end. Send a RID update notification, carrying the terminal AID and the new RID.
  • the GGSN's hand-in control module is also configured to transmit the new RID assigned to the cut-in terminal to the new SGSN;
  • the cut-out control module of the SGSN is further configured to: after receiving the new RID of the cut-out terminal transmitted by the new SGSN, call the RID update module to initiate the RID update to the peer end by the cut-out terminal; and complete the confirmation message by forwarding the relocation or Forwarding the SRNS context message or the new message to transmit the peer information of the cut-out terminal to the new SGSN;
  • the handover control module of the SGSN is configured to select a GGSN for the forwarding relocation request for the handover terminal sent by the pre-SGSN, and is further configured to: after receiving the new RID sent by the new GGSN, by forwarding the relocation response message The new RID is transmitted to the former SGSN.
  • the handover control module of the GGSN is further configured to transmit the new RID allocated for the handover terminal to the new
  • the cut-out control module of the SGSN is further configured to: after receiving the forwarding relocation response message returned by the new SGSN, by forwarding the relocation completion confirmation message or forwarding the SRNS context message or the newly added message, the peer information of the cut-out terminal to be maintained is maintained. Transmitted to the new SGSN; the SGSN's hand-in control module is configured to select the GGSN after receiving the forwarding relocation request for the hand-in terminal sent by the previous SGSN, and is also set to be after receiving the peer information of the hand-in terminal transmitted by the previous SGSN Calling the RID update module initiates RID update to the peer end for the cut-in terminal.
  • the GGSN further includes a peer information maintenance module, and the peer information maintenance module is configured to maintain the peer information of the terminal, and includes correspondence information of the terminal AID and the communication peer AID thereof;
  • the cut-out control module of the GGSN is further configured to transmit the information of the peer end of the maintained cut-out terminal to the new GGSN during the handover process;
  • the GGSN cut-in control module is further configured to: receive, during the handover process, the peer information of the cut-in terminal transmitted by the GGSN, and notify the GGSN of the peer information maintenance module to save and maintain;
  • the GGSN further includes an RID update module, and the RID update module is configured to search for a corresponding RID according to the AID of the communication peer end in the peer information of the cut-in terminal or the cut-out terminal, and send an RID update notification to the gateway accessed by the communication peer end, Carry the terminal AID and the new RID.
  • the GGSN's hand-in control module is further configured to: after the RID distribution module allocates a new RID for the hand-in terminal, send a message request to the forward GGSN through the new SGSN and the front SGSN; and after receiving the transmitted peer information of the hand-in terminal, Calling the RID update module to initiate the RID update to the peer end for the cut-in terminal;
  • the GGSN cut-out control module is further configured to: after receiving the information request sent by the former GGSN, the peer information of the cut-out terminal and/or the AID-RID mapping information of the terminal of the terminal communication are passed through the former SGSN and the new SGSN. Transfer to the new GGSN.
  • the hand-in control module of the GGSN is further configured to transmit the new RID allocated for the hand-in terminal to the front GGSN;
  • the GGSN cut-out control module is further configured to: after receiving the new RID of the cut-out terminal transmitted by the new GGSN, call the RID update module to initiate the RID update to the peer end by the cut-out terminal, and after the update is completed, the terminal to be maintained
  • the peer information and/or the AID-RID mapping information of the communication peer of the terminal is transmitted to the new GGSN.
  • the cut-out control module of the GGSN is further configured to: when establishing a forwarding tunnel with the new GGSN or after the forwarding tunnel is established, transmitting the peer information of the cut-out terminal and/or the AID-RID mapping information of the terminal of the terminal communication to the new The GGSN; the GGSN's hand-in control module is further configured to, after receiving the peer information of the hand-in terminal transmitted by the GGSN, call the RID update module to initiate the RID update to the peer end for the hand-in terminal.
  • the GGSN further includes a mapping information maintenance module, where the mapping information maintenance module is configured to: during the handover process, the AID-RID mapping information of the communication peer end of the handover terminal is locally maintained after receiving the data packet of the handover terminal, Merging the AID-RID mapping information of the communication peer end of the terminal transmitted by the former GGSN with the locally maintained AID-RID mapping information;
  • the cut-out control module of the GGSN is further configured to: during the handover process, transmit the AID-RID mapping information of the communication peer end of the service cut-out terminal to the new GGSN;
  • the handover control module of the GGSN is further configured to: receive, during the handover process, AID-RID mapping information of the communication peer end of the handover terminal transmitted by the GGSN, and notify the mapping information maintenance of the SGSN Module saving and maintenance.
  • the packet forwarding module of the GGSN is configured to forward the received data packet sent to the cut-out terminal to the former SGSN, and forward the received data packet sent to the cut-in terminal to the new SGSN;
  • the forwarding module forwards the received data packet sent to the cut-out terminal to the source radio side network element, and forwards the data packet sent to the cut-in terminal to the target radio side network element;
  • the GGSN further includes a forwarding channel establishing module, where the forwarding channel establishing module is configured to: establish a forwarding channel between the GGSN and the original GGSN for the handover terminal, or establish a forwarding between the GGSN and the new GGSN for the handover terminal.
  • the packet forwarding module of the GGSN is configured to forward the data packet by: after receiving the data packet sent to the cut-out terminal, sending the data packet to the pre-GGSN through the forwarding channel, and receiving the data sent to the cut-in terminal.
  • the packet forwarding module of the SGSN forwards the received data packet sent to the cut-out terminal to the source radio side network element, and forwards the received data packet sent to the cut-in terminal to the packet.
  • Target wireless side network element After the packet is forwarded to the new SGSN, the packet forwarding module of the SGSN forwards the received data packet sent to the cut-out terminal to the source radio side network element, and forwards the received data packet sent to the cut-in terminal to the packet.
  • the hand-in control module of the SGSN is configured to select the GGSN after receiving the forwarding relocation request for the hand-in terminal sent by the previous SGSN, and is further configured to: transmit the address information of the new GGSN to the former SGSN by forwarding the relocation response.
  • the SGSN's cut-out control module receives the address information of the new GGSN and transmits it to the former GGSN.
  • the GGSN further includes a forwarding channel establishment module, and the forwarding channel establishment module is configured to: after receiving the address information of the new GGSN transmitted by the previous SGSN, Interacting with the new GGSN, establishing a forwarding channel for cutting out the terminal with the new GGSN; or
  • the hand-in control module of the SGSN is configured to select the GGSN after receiving the forwarding relocation request for the hand-in terminal sent by the pre-SGSN; the cut-out control module of the SGSN is further configured to: when sending the forwarding relocation request to the new SGSN, the former The GGSN address information is transmitted to the new SGSN; the SGSN's hand-in control module is further configured to transmit the received address information of the former GGSN to the new GGSN when establishing the PDP bearer of the terminal with the new GGSN; the GGSN further includes a forwarding channel establishing module, The forwarding channel establishing module is configured to, after receiving the address information of the former GGSN, interact with the former GGSN to establish a forwarding channel that is cut into the terminal from the former GGSN.
  • the cut-out control module of the SGSN transmits the address information of the former GGSN to the new SGSN when transmitting the forwarding relocation completion confirmation message or forwarding the relocation request to the new SGSN; the handover control module of the SGSN is established with the new GGSN. Transmitting the address information of the former GGSN to the new GGSN when the PDP bearer is cut into the terminal; the GGSN further includes a forwarding channel establishment module; After receiving the address information of the former GGSN, the handover control module invokes the forwarding channel establishment module; the forwarding channel establishment module of the GGSN is configured to interact with the former GGSN to establish a forwarding channel for the handover terminal.
  • the peer information maintenance module of the GGSN is further configured to: after saving the peer information of the hand-in terminal transmitted by the GGSN, check the AID of the communication peer end in the data message sent by the previous GGSN to the hand-in terminal, if new The communication peer or RID updates the unsuccessful communication peer, registers the new communication peer or the AID of the unsuccessful communication peer to the peer information of the handover terminal, and sends the interception control module to the GGSN Update notification, carrying the AID of these communication peers;
  • the handover control module of the GGSN is further configured to, after receiving the update notification sent by the peer information maintenance module, invoke the RID update module to send and resend the RID update notification to the gateways accessed by the communication peers.
  • the RID update module of the GGSN searches for the address information of the gateway accessed by the communication peer according to the AID of the communication peer in the peer information of the terminal, and is based on the AID of the communication peer of the terminal from the local configuration or the communication peer
  • the subscription server (HLR/HSS) or DNS server or ILR queries the address information of the gateway accessed by the communication peer.
  • the handover control module of the SGSN determines whether to select a new GGSN according to the location information of the terminal and/or the network configuration information. If the new SGSN and the front SGSN are connected to different GGSNs on the physical connection, the new SGSN is selected. The new GGSN; if the new SGSN and the former SGSN are connected to the same multiple GGSNs, the new SGSN makes a selection decision according to the location area of the terminal and/or the APN.
  • the peer information maintenance module of the SGSN or the GGSN maintains the peer information
  • the AID of the newly discovered communication peer is registered by using a real-time flow detection mechanism and/or by checking the AID in the data packet of the terminal.
  • the AID of the communication peer to be deleted is deleted from the peer information.
  • 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 Implemented as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.
  • the present invention can support the identity identification and location separation of the terminal, avoid routing detours, and can be based on the existing relocation process as much as possible, without affecting the consistency of the existing relocation process, and has good feasibility. .

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Abstract

本发明提供一种基于WCDMA核心网的切换方法及WCDMA核心网，该方法包括：在涉及SGSN间SRNS重定位的终端切换过程中，新SGSN如果选择了新GGSN，则为终端建立新SGSN与新GGSN之间的PDP承载并将终端的AID传送给所述新GGSN；所述新GGSN为终端分配新的RID，并保存所述终端的AID与所述新的RID的映射信息；所述新GGSN或新SGSN向终端归属的ILR发送RID注册请求，携带所述新的RID，所述终端的归属ILR更新保存的该终端的RID；切换完成后，释放前SGSN和前GGSN间与所述终端相关的承载，所述终端通过新SGSN和新GGSN连接到外部的分组数据网络。本发明可以尽量基于现有重定位流程，不影响现有重定位流程的一致性，具有较好的可行性

Description

一种 WCDMA核心网及基于 WCDMA核心网的切换方法
技术领域
本发明涉及移动通信领域中的 WCDMA核心网及基于 WCDMA核心网 的切换方法。
背景技术
现有宽带码分多址（ Wideband Code Division Multiple Access, WCDMA ) 系统是当前基于无线 WCDMA技术实现业务接入的重要系统和方法。其核心 网架构如图 la所示。 包括服务 GPRS ( General Packet Radio Service, 通用无 线分组服务）节点 （Serving GPRS Support Node, SGSN ) 、 关口 GPRS节点 ( Gateway GPRS Support Node, GGSN )和归属用户签约寄存器等网元， 文 中将 2G中的归属位置寄存器 (Home Location Register, HLR)和 3G中的归属 用户服务器 (Home Subscriber Server, HSS)统称为归属用户签约寄存器， 用 HLR/HSS表示。
SGSN是 GPRS网络的一个基本的组成网元， 是为了提供 GPRS业务而 在全球移动通讯系统（ Globle System for Mobile Communication, GSM ) 网络 中引进的一个新的网元设备。 其主要的作用就是为本 SGSN服务区域的 MS 转发输入或输出的 IP分组。
GGSN提供数据报文在 WCDMA网内和外部数据网之间的路由和封装。 用户选择哪一个 GGSN作为网关，是在分组数据协议（Packet Data Protocol , PDP ) 上下文激活过程中根据用户的签约信息以及用户请求的接入点名确定 的。
HLR/HSS存储用户的分组域签约数据和路由信息。 HLR/HSS可由 SGSN 通过 Gr接口访问， GGSN通过 Gc接口访问。 对于漫游的 MS, HLR/HSS可 能与当前的 SGSN 处在不同的公共陆地移动网络 （Plubic Land Mobile Network, PLMN ) 。
WCDMA系统也同时定义了单隧道的网络架构，如图 lb所示。该架构与 图 la 的架构的区别在于数据承载由无线网络控制器 （Radio Network Controller, RNC )和 GGSN直接相连， 有效节约了数据报文的处理， 以及弱 化了 SGSN在数据转发和传输层面的功能。
移动网络的一个重要特性是在终端持续移动的过程中仍保持业务的连续 性收发， 这就是切换功能。 对于 WCDMA核心网而言， 切换功能是在重定位 流程和系统间切换流程（ Inter-system change ) 中实现的。
重定位流程完成用户在使用业务数据的过程中使数据在核心网内的接入 路径随终端位置改变而改变， 从而保证业务的连续性。 重定位流程是移动通 信核心网中最复杂的流程。 涉及到数据转发、 路由更新的功能。
重定位流程按发生的场景分为：
-服务无线网络子系统 （Service Radio Nerwork Subsystem, SRNS)重定 位；
-联合的硬切换和 SRNS重定位；
-联合的小区/ URA和 SRNS重定位；
- SRNS重定位取消。
其中， 前两种按 RNC之间有无 Iur接口进行区分， 是主要的流程。 本发 明涉及的是第二种。
下面以联合硬切换和 SRNS重定位为例描述重定位过程， RNC之间无 Iur 接口 , 且该过程只在 MS处于分组域移动管理 -连接 (PMM - CONNECTED)状 态时执行。
联合硬切换和 SRNS 重定位过程用于执行由 UMTS 陆地无线接入网 ( UMTS Terrestrial Radio Access Network, UTRAN ) 决定的硬切换时， 在 UTRAN侧从源 RNC到目标 RNC, 将 UTRAN迁移到 CN连接点。 在这个过 程中， Iu链接被重定位。 如果目标 RNC与源 RNC连接到同一 SGSN上， 则 SGSN SRNS内部的重定位过程被执行。 如果目标 RNC连接到的 SGSN与源 RNC连接到的 SGSN不同， 则 SGSN间的 SRNS重定位过程被执行。 执行这 个过程后接着执行 SGSN之间的路由区更新过程。 本发明关注的是 SGSN间 的 SRNS重定位过程。 图 2a所示为当源 RNC和目标 RNC连接在不同的 SGSN上时，在联合硬 切换和 SRNS重定位和路由区更新前的情况。图 2b所示为联合硬切换和 SRNS 重定位及路由区更新完成后的情况。 如图所示， SRNS 重定位和路由区更新 前， MS注册在前 SGSN和前 MSC/VLR中。 源 RNC用作服务 RNC(SRNC)。 SRNS重定位和 RA更新后， MS在新 SGSN和新 MSC/VLR中注册。 对于新 SGSN而言， MS处于 PMM-CON ECTED状态， 对于新 MSC/VLR而言， MS处于 MM IDLE状态， 目标 RNC用作服务 RNC。
PS域的联合硬切换和 SGSN间的 SRNS重定位过程如图 3a和图 3b所示， 包括重定位准备过程、 重定位执行过程和重定位完成过程， 具体如下：
步骤 301 : 源 RNC发起 PS域的联合硬切换和 SRNS重定位；
步骤 302: 源 RNC通过发送重定位请求 (Relocation Required)消息给前 SGSN(01d SGSN), 发起重定位准备过程；
该重定位请求中包含的重定位类型、 原因、 源小区 ID、 目标小区 ID、 源 RNC到目标 RNC透明容器等内容。 重定位类型设置为 "涉及 UE" 。
步骤 303: 前 SGSN根据目标小区 ID, 如果确定 SRNS重定位是 SGSN 间的 SRNS重定位， 发送 "转发重定位请求 (Forward Relocation Required)" 消 息给新 SGSN, 发起重定位资源分配过程；
步骤 304a: 新 SGSN发送重定位请求消息给目标 RNC; 根据请求重定位 的终端的位置信息， 找到该终端对应的新 SGSN的地址，
该重定位请求消息中包括永久 NAS UE识别号、 原因、 CN域指示器、 源 RNC 到目标 RNC 的透明容器和要设置的无线接入承载 (Radio Access Bearer, RAB)等。
步骤 304b:目标 RNC接受 RAB所有必要的资源包括 Iu用户面成功分配 后， 建立与新 SGSN的 RAB承载， 发送重定位请求证实 (Relocation Request Acknowledge )消息给新 SGSN;
重定位请求证实消息中包括： 目标 RNC至源 RNC透明容器、 RAB设置、 设置失败的 RAB等。透明容器包含 MS切换需要的所有与无线有关的信息即 完整的 RRC消息 （如物理通道重新配置） ， 通过 CN和源 RNC透明地发送 到 MS。 目标 RNC为每个要设置的 RAB (由 IP地址和隧道端点标识符定义） 接收来自源 RNC转发的下行 PDU和来自新 SGSN的下行 PDU。
步骤 305: 目标 RNC和新 SGSN之间传送用户数据的资源已分配好， 并 且新 SGSN已为 SRNS的重定位准备就绪后， 新 SGSN发送 "转发重定位响 应 (Forward Relocation Response)" 消息到前 SGSN;
转发重定位响应消息中包括： 原因、 UTRAN透明容器、 RANAP原因及 目标 RNC信息。表示目标 RNC已准备好从源 RNC接收还没被 MS证实的下 行分组包。 至此， 重定位资源分配过程被成功终结。
步骤 306:前 SGSN发送重定位命令 (Relocation Command)消息给源 RNC, 继续源 RNS的重定位；
重定位命令消息中包括：目标 RNC至源 RNC的透明容器、要释放的 RAB 及受数据转发制约的 RAB。前 SGSN根据服务质量（Quality of Service, QoS ) 确定受数据转发制约的 RAB,那些 RAB应包含在受数据转发制约的 RAB中。
步骤 307: 源 RNC从 PS域接收到重定位命令消息后， 启动数据转发定 时器， 开始为受数据转发制约的 RAB转发数据；
在 SRNS重定位中的数据转发应通过 Iu接口执行， 意味着在源 RNC和 目标 RNC之间交换的数据是在源 RNC中复制并在 IP层向目标 RNC发送的。
步骤 308: 当重定位准备过程被成功终止， 并且源 RNC 准备就绪， 源 RNC通过发送 "目标 RNC到源 RNC透明容器 "中提供的 RRC消息给 MS , 触发 SRNS重定位的执行。
上述 RRC 消息如可以是物理通道重配置消息（Physical Channel Reconfiguration), 消息中携带 UE信息元和 CN透明容器。
步骤 309: 源 RNC经前 SGSN(old SGSN)和新 SGSN(new SGSN)发送"转 发 SRNS上下文 (Forward SRNS Context)" ( RAB上下文） 消息给目标 RNC , 继续执行 SRNS的重定位， 由转发 SRNS上下文证实 (Forward SRNS Context Acknowledge)消息证实；
这个过程的目的是当在 CN中的切换发生时将 SRNS上下文从源 RNC迁 移到目标 RNC。 目标 RNC重新设置和重新启动 RLC连接， 并在目标 RNC 和 MS之间交换分组数据汇聚层协议（Packet Data Convergence Protocol, PDCP )序列号 （PDCP-SNU, PDCP-SND ) 。
步骤 310: 目标 RNC对终端进行检测， 当接收到重定位执行触发消息时， 目标 RNC发送重定位检测 (Relocation Detect)消息给新 SGSN;
对于 "UE Involved" 的 SRNS重定位类型， 重定位执行触发消息可能从
Uu接口接收到。 重定位检测消息被发送后， 目标 RNC应启动 SRNC的运行 模式。
步骤 311 : 终端重新配置好后， 发送 RRC消息如物理通道重新配置完成 (Physical Channel Reconfiguration Complete)消息或无线 载释放完成消息给 目标 RNC, 表示目标 RNC可以开始与 MS交换分组包；
当目标 RNC 接收到 UE发送的消息后， 发送重定位完成 (Relocation Complete)消息给新 SGSN, 发起重定位完成过程。
步骤 312, 新 SGSN发送转发重定位完成 (Forward Relocation Complete) 消息通知前 SGSN, SRNS重定位过程已完成， 前 SGSN返回转发重定位完成 证实 (Forward Relocation Complete Acknowledge)消息给新 SGSN;
重定位完成过程的目的是由目标 RNC向 CN表明 SRNS重定位的完成。 如果在重定位检测中用户面还没有切换， CN接收到重定位完成消息后应将用 户面从源 RNC切换到目标 RNC。
步骤 313: 新 SGSN接收到重定位检测消息后， 发送更新 PDP上下文请 求 (Update PDP Context Request)消息给相关 GGSN,携带新 SGSN地址， SGSN 隧道端点识别号和议定 QoS。 GGSN更新它们的 PDP上下文字段并返回一个 更新 PDP上下文响应 (Update PDP Context Response)消息，携带 GGSN隧道端 点识别号；
步骤 314:接收到转发重定位完成消息后，前 SGSN发送 Iu释放命令（Iu Release Command )消息给源 RNC , 当 RNC数据转发定时器到期时， 源 RNC 响应一个 Iu释放完成 (Iu Release Complete)消息；
步骤 315: MS完成重新配置过程后，如果新路由区标识与以前的不一样， MS会发起路由区更新过程。 路由区更新过程是为了将 MS 当前的位置信息登记在新 SGSN, 并把新 SGSN信息更新到 HLR中。 本流程中的路由区更新部分只是执行的 RA更新 过程的一个子集， 因为 MS处于 PMM-CON ECTED状态。
WCDMA系统可以为用户提供多种类型的业务应用， 但也存在很多应用 上的问题， 如：
GGSN不变，存在路由迂回。终端在一次连接及使用业务的过程中， GGSN 保持不变。 这样在用户发生移动的情况下， 有可能移到距离 GGSN很远而距 离业务源较近的地方， 从而造成路径迂回。 使用静态公有地址作为终端的 IP地址， 会对用户的移动性有很大限制。 静态公有 IP地址由于路由规划的原因， 只能从固定的网关出局。 一旦移动到 很远的地方， 无法就近接入外部网络。 不可避免的造成路由迂回。
为了保证业务连续性而进行的移动性管理流程很复杂。 目前的移动性管 理流程很复杂， 如上面的各流程所示。 主要原因为保证业务连续性， 终端 IP 地址不可变， GGSN不可变， 相关的承载必须有一个锚点。 响应的所有信息 都要精确传递和重新搭建承载。
上述存在的问题本质上在于 TCP/IP的地址和身份的共有性造成的。为了 解决这些问题， 业界目前提出了多种新的移动管理技术。 其本质思想是用户 身份和位置分离技术。 现有技术中已有有关身份标识和位置分离 （Subscriber Identifier & Locator Separation Network, SILSN ) 的解决方案， 如基于主机的 实现如 HIP技术， 以及基于路由器的实现如位置身份分离协议 (LISP)技术， 每种实现中又有相关的多种技术进行支持， 这些方案中终端用户的身份标识 (文中表示为 AID )在移动过程中不改变， 根据终端的位置另行分配位置标 识（文中表示为 RID )来实现数据报文的路由和转发。
图 4a示出了一种身份标识和位置分离（SILSN)的网络架构， 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。 网络中， AID作为终端的用户身份标识， 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。
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。
SILSN架构中， 骨干网的主要网元包括：
接入服务节点 (Access Service Node, ASN)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 报文的路由和转发等。终端须经过 ASN接入骨干网。 ASN为终端分配的 RID 包含该 ASN的地址信息， 或者说指向本 ASN, 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（ Common Router, CR ) , 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（ Identity Location Register, ILR ) , ILR用于保存和维 护归属用户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、 去注册和查询；
可选地， 骨干网还可以包括：
分组转发功能（Packet Transfer Function, PTF ) , 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 (Internet Service Node, ISN), 具有与通用路由器、 ASN和
ILR的接口， 用于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。
在 SILSN架构中， 在 ASN之间转发的数据报文的格式为图 4b所示。 其 中内层封装的源 AID为终端的 AID, 目的 AID为通信对端的 AID, 源 RID 为终端的 RID, 目的 RID为通信对端的 RID。 终端的 RID用于寻址到该终端 接入的 ASN,通信对端的 RID用于寻址到通信对端接入的 ASN。二层报头为 两个 ASN之间有隧道时进行的封装。 在 SILSN架构中进行通信时， ASN收到上行数据报文要进行 RID封装和 转发。 具体地， ASN在本地查询通信对端的 RID, 如查询到， 将通信对端的 RID作为目的地址， 以终端 RID为源地址封装在包含终端 AID和通信对端 AID的数据报文中， 经广义转发平面转发到通信对端接入的 ASN。 如查询不 到， 要到通信对端归属 ILR查询到通信对端的 RID并保存在本地。 此时， 可 以在报文中封装上终端的 RID后， 通过映射转发平面转发到广义转发平面， 或者，在查询到通信对端的 RID后，再由该 ASN按上述在本地查询到通信对 端的 RID时的方式进行 RID封装和转发处理。在下行方向， ASN收到广义转 发平面发来的数据报文后进行解 RID封装， 剥去其中的 RID后发送给终端。
可以看出， ASN为了实现报文的正常转发， 需要在终端接入时为该终端 分配 RID, 并需要到 ILR注册该 RID, 以更新 ILR中的该终端的 RID。 ASN 还需要维护终端及其通信对端的 AID-RID映射信息，来实现对报文的 RID封 装。 在一个示例中， ASN为每个终端维护该终端的对端信息 （也可称为终端 与通信对端的连接信息， 或终端与通信对端的通信关系信息） ， 其中包含该 终端 AID及其通信对端 AID的对应关系信息，如在对端表中保存终端及其通 信对端的 AID。 还可以包括该终端的 AID-RID映射信息， 同时， ASN统一维 护所有终端的通信对端的 AID-RID映射信息。 当然， ASN为每个终端分别维 护其所有通信对端的 AID-RID映射信息也是可以的。
传统 IP网络连接， 边界网关对数据报文的转发处理、 数据报文格式、 信令的 查询和鉴权处理， 移动性管理的处理等等方面。 因此可以将 SILSN架构应用 在现有的 WCDMA核心网中实现移动性管理和业务接入， 可以有效地解决 WCDMA存在的上述问题。
但是， 已有技术对于如何在 WCDMA系统的切换过程中支持终端的身份 标识与位置分离， 避免出现路由迂回， 都没有提出相应的实现方案。
发明内容
本发明提供一种 WCDMA核心网及基于 WCDMA核心网的切换方法, 以避免路由迂回。 为了解决上述技术问题，本发明提供了一种基于 WCDMA核心网的切换 方法， 包括：
在涉及 SGSN间服务无线网络子系统 (SRNS)重定位的终端切换过程中， 新 SGSN如选择了新关口 GPRS节点 (GGSN),则为该终端建立新 SGSN与该 新 GGSN之间的 PDP承载并将该终端的 AID传送给该新 GGSN;
该新 GGSN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； 以及
该新 GGSN或新 SGSN向该终端归属身份位置寄存器 (ILR)发送 RID注 册请求， 携带该新的 RID, 该终端归属 ILR更新保存的该终端的 RID;
切换完成后， 释放前 SGSN和前 GGSN间该终端相关的承载， 该终端通 过新 SGSN和新 GGSN连接到外部的分组数据网络。
上述切换方法还可包括： 前 SGSN保存并维护该终端的对端信息， 该对 端信息包含该终端 AID与该终端的通信对端的 AID的对应关系信息；在切换 过程中， 前 SGSN将维护的该终端的对端信息传送到该新 SGSN; 前 SGSN 或新 SGSN根据终端的对端信息中通信对端的 AID, 查找到该通信对端接入 的网关的地址信息， 向该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。
上述切换方法还可包括： 前 GGSN保存并维护终端的对端信息和该终端 的通信对端的 AID-RID映射信息，该对端信息包含该终端的 AID与该终端的 通信对端的 AID的对应关系信息； 在切换过程中， 前 GGSN将维护的该终端 的对端信息和 /或该终端的通信对端的 AID-RID映射信息经 GGSN之间的接 口， 或者经前 SGSN、 新 SGSN传送到新 GGSN; 前 GGSN或新 GGSN从本 地或从映射服务器查找到该终端的通信对端的 RID, 向该通信对端接入的网 关发送 RID更新通知 , 携带该终端的 AID和该新的 RID。
上述切换方法还可包括： 前 GGSN 保存并维护终端的通信对端的
AID-RID映射信息； 在该切换过程中， 前 GGSN将维护的该终端的通信对端 的 AID-RID映射信息传送到新 GGSN,新 GGSN在收到该终端的数据报文后 即在本地维护该终端的通信对端的 AID-RID映射信息，并在收到前 GGSN传 送的 AID-RID映射信息后，将收到映射信息的和本地维护的该 AID-RID映射 信息合并。
上述切换方法还可包括： 在切换过程中， 前 GGSN收到发给该终端的数 据报文后， 经前 SGSN发给源无线侧网元， 该数据报文经过源无线侧网元和 目标无线侧网元间的转发通道被转发到目标无线侧网元， 由目标无线侧网元 发给终端； 或者，在切换过程中，建立前 GGSN和新 GGSN之间的转发通道， 前 GGSN收到发给终端的数据报文后， 经转发通道发给新 GGSN, 新 GGSN 再将该数据报文经新 SGSN发给目标无线侧网元， 由该目标无线侧网元发给 终端。
上述切换方法还可具有以下特点： 新 SGSN是在收到前 SGSN的转发重 定位请求后， 为该终端选择新 GGSN, 与该新 GGSN交互建立该终端的 PDP 承载并将该终端的 AID传送给新 GGSN,新 GGSN是在收到该终端的 AID后 为该终端分配新的 RID;该新 GGSN直接向终端归属的 ILR发送 RID注册请 求， 或者， 新 GGSN通过 PDP承载建立的消息或新增消息将新的 RID传送 到新 SGSN, 新 SGSN与目标 RNC交互建立该终端的 RAB后， 向终端归属 的 ILR发送 RID注册请求， 并向前 GGSN返回转发重定位响应消息。
上述切换方法还可包括：新 GGSN将新的 RID传送到新 SGSN,新 SGSN 通过转发重定位响应消息将该新的 RID发送到前 SGSN; 其中， 该前 SGSN 是在收到该新的 RID后，根据维护的该终端的对端信息中通信对端的 AID查 找到通信对端接入的网关的地址信息， 向所述通信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; 前 SGSN是通过转发重定位完成 证实消息或转发 SRNS上下文消息或新增消息将当前维护的该终端的对端信 息传送到新 SGSN, 在传送之前， 该前 SGSN如发现该终端有新的通信对端， 在该终端的对端信息中登记该新的通信对端的 AID并向该新的通信对端接入 的网关发送 RID更新通知。
上述切换方法还可具有以下特点：
前 SGSN是在收到新 SGSN返回的转发重定位响应消息后， 通过重定位 完成过程中发送到新 SGSN的转发重定位完成证实消息或转发 SRNS上下文 消息或新增消息， 将维护的该终端的对端信息传送到新 SGSN, 新 SGSN是 根据该对端信息中通信对端的 AID查找到通信对端接入的网关的地址信息， 向该通信对端接入的网关发送 RID更新通知。
上述切换方法还可包括： 新 GGSN在为终端分配新的 RID后， 通过新 SGSN, 前 SGSN向前 GGSN发送信息请求； 其中， 前 SGSN是在收到该信 息请求后，将维护的终端的对端信息和 /或该终端的通信对端的 AID-RID映射 信息经前 SGSN、 新 SGSN传送到新 GGSN, 新 GGSN是根据收到的对端信 息中通信对端的 AID查询到通信对端的 RID,向通信对端接入的网关发送 RID 更新通知。
上述切换方法中，建立前 GGSN和新 GGSN之间的转发通道的步骤可以 为：通过以下方式中的一种在前 GGSN和新 GGSN间建立该终端的转发通道： 方式一， 新 SGSN通过转发重定位响应将该新 GGSN的地址信息发送到 前 SGSN, 前 SGSN将该新 GGSN的地址信息传送给前 GGSN; 前 GGSN根 据该地址信息与新 GGSN交互， 建立与新 GGSN间该终端的转发通道；
方式二， 前 SGSN在向新 SGSN发送转发重定位请求时， 将前 GGSN的 地址信息传送给新 SGSN, 新 SGSN在与新 GGSN建立终端的 PDP承载时将 前个 GGSN的地址信息传送给新 GGSN,新 GGSN根据前 GGSN的地址信息 与前 GGSN交互， 建立与前 GGSN间该终端的转发通道；
该转发通道建立后， 前 GGSN将收到的发送给终端的报文通过该转发通 道转发到新 GGSN, 新 GGSN再通过新 SGSN发送到目标无线侧网元。
上述切换方法还可具有以下特点： 当转发通道釆用方式一建立时， 新
GGSN的地址信息为该终端的新的 RID; 或者， 当该转发通道釆用方式二建 立时，新 SGSN通过转发通道建立时的消息将该终端新的 RID发给前 GGSN; 其中， 前 GGSN是在收到终端的新的 RID后， 根据维护的该终端的对端信息 和该终端的通信对端的 AID-RID映射信息查找到通信对端的 RID , 向所述通 信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;之后 , 该前 GGSN才将维护的该终端的对端信息和 /或该终端的通信对端的 AID-RID 映射信息传送到新 GGSN。
上述切换方法还可具有以下特点： 前 GGSN是在与新 GGSN建立该转 发通道时或在该转发通道建立后， 才将该终端的对端信息和 /或该终端通信对 端的 AID-RID映射信息传送到新 GGSN,新 GGSN是根据传送来的对端信息 中通信对端的 AID查询到通信对端的 RID , 向所述通信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。
上述切换方法还可具有以下特点： 新 SGSN是在重定位完成过程中收到 转发重定位完成证实消息后， 为终端选择新的 GGSN, 和该新 GGSN之间建 立该终端的 PDP承载并将该终端的 AID传送给新 GGSN; 新 GGSN为终端 分配新的 RID后， 直接向该终端归属的 ILR发送 RID注册请求， 或者， 该新 GGSN通过 PDP承载建立消息或新增消息将该新的 RID传送到新 SGSN, 由 该新 SGSN向该终端的归属 ILR发送 RID注册请求。
上述切换方法还可包括：新 GGSN通过 PDP承载建立消息或新增消息将 新的 RID传送到新 SGSN, 新 SGSN将该新的 RID传送到前 SGSN; 其中， 前 SGSN是在收到该新的 RID后， 根据维护的终端的对端信息中通信对端的 AID查找到通信对端接入的网关的地址信息， 向该通信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; 该新 GGSN在发起 RID更新 流程后继续维护该终端的对端信息， 在该 RID更新流程结束后， 再将维护的 该终端的对端信息传送给新 SGSN进行保存和维护。
上述切换方法还可包括： 新 GGSN或新 SGSN向终端归属的 ILR发送 RID注册请求后， 新 GGSN向前 GGSN, 或者由新 SGSN向前 SGSN请求对 端信息。
上述切换方法还可包括：新 GGSN通过 PDP承载建立消息或新增消息将 新的 RID传送到新 SGSN,新 SGSN将该新的 RID传送到前 SGSN;前 SGSN 收到后， 将该新的 RID发送到前 GGSN; 前 GGSN根据保存的该终端的对端 信息中通信对端的 AID, 查找到该通信对端接入的网关的地址信息， 向所述 通信对端接入的网关发送 RID更新通知； 或者， 该前 GGSN将保存的对端信 息传送到新 SGSN, 由该新 SGSN才艮据收到的终端的对端信息中通信对端的 AID, 查找到通信对端接入的网关的地址信息， 向所述通信对端接入的网关 发送 RID更新通知。
上述切换方法还可包括： 前 SGSN在向新 SGSN发送转发重定位完成证 实消息或转发重定位请求时， 将前 GGSN 的地址信息传送给新 SGSN, 新 SGSN在与新 GGSN建立终端的 PDP承载时将前 GGSN的地址信息传送给新 GGSN, 新 GGSN获取到前 GGSN的地址信息后， 与前 GGSN之间建立终端 的转发通道； 该转发通道建立后， 前 GGSN将收到的发送给终端的报文通过 该转发通道转发到新 GGSN, 新 GGSN再通过新 SGSN发送到目标无线侧网 元。
上述切换方法还可包括： 新 GGSN收到前 GGSN传送来的对端信息后， 检查前 GGSN转发来的发给终端的数据报文中通信对端的 AID, 如发现新的 通信对端和 /或 RID更新未成功的通信对端，向这些通信对端接入的网关发送 和 /或重发 RID更新通知， 并将新的通信对端的 AID登记到该终端的对端信 息中。
上述切换方法还可具有以下特点： 涉及 SGSN 间服务无线网络子系统 (SRNS)重定位的终端切换过程是指 PS域的联合硬切换和终端跨 SGSN的重 定位过程， 或者是指联合的小区 /URA和服务 RNS重定位的过程。
上述切换方法还可具有以下特点： 前 SGSN或新 SGSN根据该终端的对 端信息中通信对端的 AID查找到通信对端接入的网关的地址信息的步骤中， 是根据该终端的通信对端的 AID从本地配置或通信对端的归属地签约服务器 (HLR/HSS)或 DNS服务器或 ILR查询到该通信对端接入的网关的地址信息； 当查询到的通信对端接入的网关为 SGSN时，该 GGSN收到 RID更新通知后， 将保存的该终端的 AID-RID映射信息中的 RID更新为该新的 RID; 当查询到 的通信对端接入的网关为 SGSN时， 该 SGSN收到 RID更新通知后， 还要向 该通信对端接入的 GGSN发送 RID更新通知；该 GGSN收到通知后再将保存 的终端的 AID-RID映射信息中的 RID更新为该新的 RID。
上述切换方法还可包括： 在重定位完成过程终端发起的路由区更新过程 中， 到该终端归属的签约寄存器 (HLR/HSS)将该终端接入的 GGSN地址更新 为该新 GGSN的地址。
上述切换方法还可包括： 新 SGSN根据终端的位置信息和 /或网络配置信 息来判断是否选择新 GGSN, 如果新 SGSN和前 SGSN在物理连接上连接着 不同的 GGSN,则判断新 SGSN需要选择新的 GGSN;如果新 SGSN和前 SGSN 连接着相同的多个 GGSN, 则新 SGSN根据终端所在位置区域和 /或 APN来 做选择判断。
上述切换方法还可具有以下特点：新 GGSN如选择了新 GGSN作为重定 位后要接入的 GGSN, 则该前 SGSN通过重定位准备过程中向新 SGSN发送 的重定位请求消息， 或通过重定位完成过程中向新 SGSN发送的转发重定位 完成证实消息， 或通过新增的消息将终端的对端信息传送到新 SGSN。
上述切换方法还可具有以下特点： 前 SGSN或前 GGSN在维护对端信 息时，通过流实时检测机制和 /或检查该终端的数据 文中的 AID来发现新的 通信对端或需删除的通信对端， 将新的通信对端的 AID登记到该终端的对端 信息中， 将该对端信息中需删除的通信对端的 AID删除。
上述切换方法还可具有以下特点：
前 SGSN或前 GGSN在维护对端信息时，通过流实时检测机制和 /或检查 该终端的数据报文中的 AID, 将发现的新的通信对端的 AID登记到该终端的 对端信息中， 将需删除的通信对端的 AID从该对端信息中删除。
相应地， 本发明还提供一种 WCDMA核心网， 包括关口 GPRS 节点
(GGSN), 服务 GPRS节点 (SGSN)和归属用户签约寄存器 (HLR/HSS), 该核心 网还包括身份位置寄存器 (ILR), 其中：
所述 SGSN设置成： 在涉及 SGSN间服务无线网络子系统 (SRNS)重定位 的终端切入过程中， 选择 GGSN, 以及， 在选择了新关口 GPRS节点 (GGSN) 时，为切入终端建立本 SGSN与新 GGSN之间的 PDP承载并将该终端的 AID 传送给新 GGSN;
所述 GGSN设置成为切入终端分配新的位置标识 (RID),并保存该切入终 端的身份标识 (AID)与新的 RID之间的映射信息；
所述 GGSN或 SGSN还设置成：向切入终端归属的 ILR发送 RID注册请 求， 携带该切入终端的新的 RID, 以使该切入终端归属的 ILR更新保存的该 切入终端的 RID。
SGSN可包括：
切出控制模块，其可设置成：在涉及 SGSN间服务无线网络子系统 (SRNS) 重定位的切换过程中， 收到源无线侧网元发送的针对切出终端的重定位请求 后， 向新 SGSN发送转发重定位请求， 以及， 在收到新 SGSN发送的转发重 定位完成消息后， 向新 SGSN回复转发重定位完成证实消息；
切入控制模块，其可设置成：在涉及 SGSN间服务无线网络子系统 (SRNS) 重定位的切换过程中， 收到前 SGSN发送的针对切入终端的转发重定位请求 或转发重定位完成证实消息后， 选择 GGSN, 以及， 在选择了新 GGSN时， 为该切入终端建立本 SGSN与新 GGSN间的 PDP承载，将该切入终端的 AID 传送给新 GGSN; 以及，
报文转发模块， 其可设置成在 GGSN和无线侧网元间转发切入终端和切 出终端的数据报文；
GGSN可包括： 切出控制模块， 其可设置成在终端切出后， 释放为该切 出终端分配的资源；
切入控制模块， 其可设置成： 在收到前 SGSN发送的转发重定位请求和 新 SGSN传送的切入终端的 AID后， 调用 RID分配模块， 为该切入终端建立 与新 SGSN之间的 PDP承载；
RID分配模块， 其可设置成为切入终端分配指向本 GGSN的新的 RID, 保存该切入终端 AID与该新的 RID的映射信息； 以及，
报文转发模块， 其可设置成对切入终端、 切出终端的数据报文进行转发 处理。
SGSN还可包括 RID注册模块， SGSN的 RID注册模块可设置成： 向切 入终端归属的身份位置寄存器 (ILR)发送注册请求，携带该切入终端的 AID和 新的 RID; GGSN的切入控制模块还可设置成将为切入终端分配的新的 RID 传送到新 SGSN; SGSN的切入控制模块还可设置成在收到新的 RID后， 调 用 SGSN的 RID注册模块； 或者， GGSN还可包括 RID注册模块， GGSN的 RID注册模块可设置成： 向切入终端归属的身份位置寄存器 (ILR)发送注册请 求， 携带该切入终端的 AID和新的 RID; GGSN的切入控制模块还可设置成 获得切入终端新的 RID后调用该 GGSN的 RID注册模块。
SGSN还可包括对端信息维护模块， 该对端信息维护模块可设置成： 维 护终端的对端信息 , 该对端信息包含终端的 AID与该终端的通信对端的 AID 的对应关系信息；
SGSN 的切出控制模块还可设置成： 在切换过程中， 将维护的切出终端 的对端信息传送到新 SGSN并通知对端信息维护模块停止维护该切出终端的 对端信息；
SGSN的切入控制模块还可设置成： 在切换过程中， 接收前 SGSN传送 的切入终端的对端信息， 通知本 SGSN的对端信息维护模块保存和维护该切 入终端的对端信息；
SGSN还可包括 RID更新模块， SGSN的 RID更新模块可设置成： 根据 切入终端或切出终端的对端信息中通信对端的 AID查找到该通信对端接入的 网关的地址， 向该通信对端接入的网关发送 RID更新通知， 携带该切入终端 或切出终端的 AID和新的 RID。
SGSN的切入控制模块还设置成： 在收到新 GGSN发送的新的 RID后， 通过转发重定位响应消息将该新的 RID传送到前 SGSN;
SGSN的切出控制模块还可设置成： 在收到新 SGSN传送的切出终端的 新的 RID后， 调用 RID更新模块为切出终端发起到对端的 RID更新； 以及， 通过转发重定位完成证实消息或转发 SRNS上下文消息或新增消息将维护的 切出终端的对端信息传送到新 SGSN;
SGSN的切入控制模块可设置成在收到前 SGSN发送的针对切入终端的 转发重定位请求后选择 GGSN。
SGSN的切出控制模块还可设置成在收到新 SGSN返回的转发重定位响 应消息后， 通过转发重定位完成证实消息或转发 SRNS上下文消息或新增消 息， 将维护的切出终端的对端信息传送到新 SGSN;
SGSN的切入控制模块可设置成在收到前 SGSN发送的针对切入终端的 转发重定位请求后选择 GGSN; SGSN的切入控制模块还可设置成在收到前 SGSN传送的切入终端的对端信息后， 调用 RID更新模块为切入终端发起到 对端的 RID更新。
GGSN还可包括对端信息维护模块， GGSN的对端信息维护模块可设置 成维护终端的对端信息， 该对端信息包含终端的 AID与该终端的通信对端的 AID的对应关系信息；
GGSN的切出控制模块还可设置成在切换过程中， 将维护的切出终端的 对端信息传送到新 GGSN;
GGSN的切入控制模块还可设置成： 在切换过程中， 接收前 GGSN传送 的切入终端的对端信息，通知本 GGSN的对端信息维护模块进行保存和维护；
GGSN还可包括 RID更新模块，该 RID更新模块可设置成根据维护的切 入终端或切出终端的对端信息中通信对端的 AID查找到该通信对端的 RID, 向该通信对端接入的网关发送 RID更新通知， 携带该切入终端或切出终端的 AID和新的 RID。
GGSN的切入控制模块还可设置成： 在 RID分配模块为切入终端分配新 的 RID后， 通过新 SGSN、 前 SGSN向前 GGSN发送信息请求； 以及， 在收 到传送来的切入终端的对端信息后， 调用 RID更新模块为切入终端发起到对 端的 RID更新；
GGSN的切出控制模块还可设置成：在收到前 GGSN发送的信息请求后， 将维护的切出终端的对端信息和 /或该切出终端的通信对端的 AID-RID 映射 信息经前 SGSN、 新 SGSN传送到新 GGSN。
GGSN的切入控制模块还可设置成将为切入终端分配的新的 RID传送给 前 GGSN;
GGSN的切出控制模块还可设置成： 在收到新 GGSN传送的切出终端的 新的 RID后，调用 RID更新模块为切出终端发起到对端的 RID更新，在更新 完成后， 将维护的该切出终端的对端信息和 /或该切出终端的通信对端的 AID-RID映射信息传送到新 GGSN。
GGSN的切出控制模块还可设置成： 在与新 GGSN建立转发通道时或在 该转发通道建立后， 将切出终端的对端信息和 /或该切出终端的通信对端的 AID-RID映射信息传送到新 GGSN;
GGSN的切入控制模块还可设置成在收到前 GGSN传送的切入终端的对 端信息后， 调用 RID更新模块为切入终端发起到对端的 RID更新。 GGSN的切出控制模块还可设置成： 在切换过程中， 将维护的切出终端 的通信对端的 AID-RID映射信息传送到新 GGSN;
GGSN还可包括映射信息维护模块， 该映射信息维护模块可设置成： 在 切换过程中， 收到切入终端的数据 文后即在本地维护该切入终端的通信对 端的 AID-RID映射信息，并将收到的前 GGSN传送的该切入终端的通信对端 的 AID-RID映射信息和本地维护的 AID-RID映射信息合并；
GGSN的切入控制模块还可设置成： 在切换过程中， 接收前 GGSN传送 的切入终端的通信对端的 AID-RID映射信息， 并通知本 SGSN的映射信息维 护模块对收到的映射信息进行保存和维护。
GGSN的报文转发模块可设置成通过如下方式转发数据报文： 将收到的 发给切出终端的数据报文转发给前 SGSN, 将收到的发给切入终端的数据报 文转发给新 SGSN; 或者
GGSN还可包括转发通道建立模块， 该转发通道建立模块可设置成： 在 切换过程中为切入终端建立本 GGSN和原 GGSN之间的转发通道，或为切出 终端建立本 GGSN和新 GGSN之间的转发通道； GGSN的报文转发模块可设 置成通过如下方式转发数据报文： 在收到发给切出终端的数据报文后， 经该 转发通道发给前 GGSN, 及收到发给切入终端的数据报文后， 经该转发通道 转发给新 SGSN;
SGSN 的报文转发模块可设置成通过如下方式转发数据报文： 用于将收 到的发给切出终端的数据报文转发到源无线侧网元， 将收到的发给切入终端 的数据报文转发到目标无线侧网元。
SGSN的切入控制模块可设置成在收到前 SGSN发送的针对切入终端的 转发重定位请求后选择 GGSN; SGSN的切入控制模块还可设置成： 通过转 发重定位响应将新 GGSN的地址信息传送到前 SGSN; SGSN的切出控制模 块还可设置成将收到的新 GGSN的地址信息传送给前 GGSN; GGSN还可包 括转发通道建立模块， 该转发通道建立模块可设置成： 收到前 SGSN传送的 新 GGSN的地址信息后，与该新 GGSN交互，建立与新 GGSN间切出终端的 转发通道； 或者 SGSN的切入控制模块可设置成在收到前 SGSN发送的针对切入终端的 转发重定位请求后选择 GGSN; SGSN的切出控制模块还可设置成： 在向新 SGSN发送转发重定位请求时，将前 GGSN的地址信息传送给新 SGSN; SGSN 的切入控制模块还可设置成在与新 GGSN建立终端的 PDP承载时将收到的前 GGSN的地址信息传送给新 GGSN; GGSN还可包括转发通道建立模块， 该 转发通道建立模块可设置成在收到前 GGSN的地址信息后，与前 GGSN交互， 建立与前 GGSN间切入终端的转发通道。
SGSN的切出控制模块还可设置成在向新 SGSN发送转发重定位完成证 实消息或转发重定位请求时，将前 GGSN的地址信息传送给新 SGSN; SGSN 的切入控制模块还可设置成在与新 GGSN建立切入终端的 PDP承载时将收到 的前 GGSN的地址信息传送给新 GGSN; GGSN还可包括转发通道建立模块； GGSN的切入控制模块还可设置成在收到前 GGSN的地址信息后， 调用转发 通道建立模块； GGSN的转发通道建立模块设置成与前 GGSN之间交互建立 切入终端的转发通道。
GGSN的对端信息维护模块还可设置成： 在保存前 GGSN传送来的切入 终端的对端信息后， 检查前 GGSN转发来的发给该切入终端的数据报文中通 信对端的 AID , 如发现新的通信对端或 RID更新未成功的通信对端 , 将该新 的通信对端或 RID更新未成功的通信对端的 AID登记到该切入终端的对端信 息中，并向本 GGSN的切入控制模块发更新通知，携带该新的通信对端或 RID 更新未成功的通信对端的 AID;
GGSN的切入控制模块还可设置成在收到对端信息维护模块发送的更新 通知后，调用 RID更新模块向该新的通信对端或 RID更新未成功的通信对端 接入的网关发送或重发 RID更新通知。
涉及 SGSN间服务无线网络子系统 (SRNS)重定位的终端切换过程可以是 指 PS域的联合硬切换和终端跨 SGSN的重定位过程，或者可以是指联合的小 区/ URA和服务 RNS重定位的过程。
GGSN的 RID更新模块可设置成通过如下方式查找到通信对端接入的网 关的地址信息： 根据该终端通信对端的 AID从本地配置或通信对端的归属用 户签约服务器 (HLR/HSS)或 DNS服务器或 ILR查询到该通信对端接入的网关 的地址信息。
SGSN的切入控制模块还可设置成根据终端的位置信息和 /或网络配置信 息来判断是否选择新 GGSN, 如本 SGSN作为新 SGSN和前 SGSN在物理连 接上连接着不同的 GGSN,则判断选择新 GGSN;如果本 SGSN作为新 SGSN 和前 SGSN连接着相同的多个 GGSN, 则根据终端所在位置区域和 /或 APN 来判断是否选择新 GGSN。
SGSN或 GGSN的对端信息维护模块可设置成通过如下方式维护对端信 息： 通过流实时检测机制和 /或通过检查终端的数据报文中的 AID, 将发现的 新的通信对端的 AID登记到该终端的对端信息中， 将需删除的通信对端的 AID从该终端的对端信息中删除。
上述基于 WCDMA核心网的切换方法及相应的 WCDMA核心网除了可 实现切换外， 可以支持终端的身份标识与位置分离， 避免路由迂回。 并且在 一些实施例中， 可以尽量基于现有重定位流程， 不影响现有重定位流程的一 致性， 具有较好的可行性。
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 la为现有 WCDMA系统分组域的架构图；
图 lb 为现有 WCDMA单隧道系统的架构图；
图 2a为联合硬切换和 SRNS重定位和路由区更新前的示意图； 图 2b 为联合硬切换和 SRNS重定位及路由区更新后的示意图； 图 3a和图 3b是现有 PS域的联合硬切换和 SGSN间的 SRNS重定位过程 的流程图；
图 4a为一种 SILSN网络架构的示意图；
图 4b是图 4a所示 SILSN架构中数据报文的格式的示意图；
图 5为本发明具有 SILSN架构的 WCDMA核心网架构一的示意图； 图 6为本发明具有 SILSN架构的 WCDMA核心网架构二的示意图; 图 7为本发明具有 SILSN架构的 WCDMA核心网架构三的示意图; 图 8是本发明实施例一的切换方法的流程示意图；
图 9是本发明实施例二的切换方法的流程示意图；
图 10是本发明实施例三的切换方法的流程示意图；
图 11是本发明实施例四的切换方法的流程示意图；
图 12是本发明实施例五的切换方法的流程示意图。
本发明的较佳实施方式
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。
本发明将上述 SILSN架构应用于 WCDMA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,可以向通信对端接入的网关发送 RID更新通 知。 源 ASN还可以向目标 ASN传递该终端的对端信息和 /或所有通信对端的 AID-RID映射信息。 另外， 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。
在图 5~7中示出了三种具有 SILSN架构的 WCDMA核心网的架构： 架构一， SGSN与 ILR之间具有信令接口， 用于到 ILR注册、 去注册终 端的 RID。 GGSN为终端分配 RID。 GGSN与 ILR之间也具有信令接口， 用 于向 ILR查询通信对端的 RID。 如图 5所示。
架构二， GGSN为终端分配 RID, GGSN与 ILR之间具有信令接口， 用 于到 ILR注册、 去注册终端的 RID, 以及查询通信对端的 RID。 如图 6所示。 架构三， SGSN和 ILR之间具有信令接口， 用于到 ILR注册、 去注册终 端的 RID和查询通信对端的 RID。 GGSN为终端分配 RID, 与 ILR之间没有 直接的信令接口， 通过 SGSN向 ILR查询通信对端的 RID。 如图 7所示。
以上三种架构中， 由 GGSN分配 RID, 维护终端的通信对端的 AID-RID 映射信息， 对数据报文进行 RID封装和解 RID封装， GGSN之间的报文通过 广义转发平面（可由支持 RID路由和转发的分组数据网络实现）路由和转发。 终端的对端信息可以在 SGSN和 /或 GGSN上维护。
对于图 lb所示的直连隧道的情况， 并不影响上述三种架构的划分。 上述 架构都存在如何进行系统内切换的问题， SGSN间的切换会导致 SGSN的变 化， 以及可能的 GGSN的变化。 本发明并不局限于上述三种架构。 由于无线 接入网可能釆用其他的结构，在其他架构中目标 RNC可能是其他的无线侧网 元。
在基于以上 WCDMA核心网架构的重定位准备过程中， GGSN不再需要 锚定，新 SGSN可以选择新的 GGSN。按照 GGSN是否发生改变，分为 GGSN 和 SGSN均改变， 以及 GGSN不变， SGSN改变两种场景。
实施例一和实施例二针对的是 GGSN不变的场景， 在 SGSN中维护终端 的对端信息， 在重定位过程中前 SGSN需将切出终端的对端信息传送到新 SGSN。 如果在 GGSN中维护对端信息， 重定位流程同现有技术， 不作改变。
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， 在描述某网元作为原侧网元对终端切换进行处理时， 称该终端为 切出终端； 在描述某网元作为目标侧网元对终端切换进行处理时， 称该终端 为切入终端。 文中， 还将终端的通信对端接入的网元简称为对端网元； 另， 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。
实施例一
本实施例基于的 WCDMA核心网架构可以是上述 3种架构中的任一种， 重定位过程中 GGSN不变。 SGSN保存和维护终端的对端信息。 前 SGSN通 过重定位完成过程向新 SGSN发送的 "转发重定位完成消息" 消息来传递终 端的对端信息。
如图 8所示，本实施例 PS域的联合硬切换和终端跨 SGSN的重定位流程 包括：
步骤 801 : 同现有重定位流程的步骤 301至步骤 310;
其中新 SGSN收到前 SGSN发送的转发重定位请求消息后会判断是否需 要选择新的 GGSN, 本实施例为不需要。
步骤 802: 目标 RNC收到终端发送的 RRC消息如物理通道重新配置完 成消息或无线承载释放完成消息后， 向新 SGSN发送重定位完成消息， 此步 骤同现有重定位流程的步骤 311 ;
步骤 803: 新 SGSN向前 SGSN发送 "转发重定位完成消息" ； 该转发重定位完成消息可以同现有技术的该消息， 也可以在现有技术的 该消息中增加一个指示信息， 用于向前 SGSN索要对端信息。
步骤 804: 前 SGSN收到 "转发重定位完成消息" 后， 将该终端的对端 信息携带在 "转发重定位完成证实消息" 中发送给新 SGSN;
如果前 SGSN没有保存该终端的对端信息， 可以在重定位完成回应消息 中携带没有该对端信息的指示信息。
步骤 805: 新 SGSN向前 SGSN发起 PDP更新， 后续流程同现有技术。 实施例二
本实施例基于的 WCDMA核心网架构可以是上述 3种架构中的任一种， 重定位过程中 GGSN不变。 SGSN保存有终端的对端信息。 前 SGSN通过重 定位准备过程向新 SGSN发送的消息如 "重定位请求消息" 来传递终端的对 端信息。
如图 9所示，本实施例 PS域的联合硬切换和终端跨 SGSN的重定位流程 包括：
步骤 901 : 源 RNC决定发起切换流程， 同步骤 301 ;
步骤 902: 源 RNC向前 SGSN发送重定位请求， 同步骤 302; 步骤 903: 前 SGSN向新 SGSN发送转发重定位请求消息， 消息中携带 原有参数信息和前 SGSN维护的该终端的对端信息；
步骤 904: 新 SGSN判断是否需要选择新的 GGSN, 本实施例中不需要 选择， 因此， 新 SGSN向目标 RNC发送重定位请求， 后续同现有技术。
本步中， 新 SGSN可以根据终端的位置信息和 /或网络配置信息来判断是 否选择新的 GGSN。 例如， 如果新 SGSN和前 SGSN在物理连接上连接着不 同的 GGSN, 那么新 SGSN选择新的 GGSN, 新 SGSN从上下文中可以知道 老 GGSN的地址。 如果新 SGSN和前 SGSN都连接着相同的多个 GGSN, 那 么新 SGSN可以根据终端所在位置区域和 /或 APN来做选择判断。 在一个示 例中， 新 SGSN可以根据终端所在 LAI或 RNC ID, 选择距离该终端最近的 并且是属于同一个 APN的 GGSN。 其他实施例同此。
上述两个实施例的流程中， 前 SGSN是通过现有的消息将对端信息传送 到新 SGSN的， 但本发明并不局限于此， 也可以通过前 SGSN向新 SGSN发 送新的消息来传递终端的对端信息。
以下的实施例均针对的是重定位过程中发生 GGSN变化的场景， 此时涉 及到的与 AID、 RID有关的处理包括： 切入一侧要为终端分配新的 RID, 到 该终端归属 ILR注册该终端新的 RID; 切入一侧或切出一侧向对端网关 （如 GGSN, 也可能是 ISN等边界网关）发起 RID更新。 切出一侧向切入一侧传 递该终端的对端信息。 切换过程中切出一侧向切入一侧对通信对端发送给该 终端的报文的转发可以用图 3a,3b中的现有方式实现， 也可以改由 GGSN之 间的转发隧道来实现。
实施例三：
本实施例基于的 WCDMA核心网的架构为上述架构一和架构三，重定位 过程中 GGSN改变， 由 SGSN到 ILR更新注册终端的 RID, 维护和保存终端 的对端信息， 并从切出侧向切入侧传递。
如图 10所示， 本实施例 PS域的联合硬切换和终端跨 SGSN、 GGSN的 重定位流程包括：
步骤 1001-1003: 同步骤 301-303; 步骤 1004: 新 SGSN收到重定位请求消息， 如选择一个新的 GGSN, 则 和该新 GGSN 交互建立该终端的 PDP承载并将该终端的 AID传送给新 GGSN, 新 GGSN为终端分配新的 RID, 保存该终端 AID和该新的 RID的映 射信息， 并将该新的 RID传送给新 SGSN, 如携带在 PDP承载建立响应中； 如果基于第二种架构， 即只有 GGSN与 ILR间具有信令接口， 新 GGSN 可以在为终端分配了新的 RID后， 或在收到新 SGSN与目标 RNC建立了该 终端的 RAB后，通过向新 SGSN发送的消息如新增的消息向该终端归属 ILR 发送注册请求（属于更新注册） 。 相应地， 新 GGSN不必向新 SGSN传送该 新的 RID, 也不必再执行步骤 1006了。
步骤 1005:新 SGSN与目标 RNC交互，建立该终端的 RAB,同步骤 304; 步骤 1006: 新 SGSN向该终端归属 ILR发送 RID注册请求，携带该终端 的 AID和新的 RID;
该 ILR收到 RID注册请求后， 将保存的该终端 AID-RID映射信息中的 RID更新为该新的 RID, 也即更新了该终端的 AID-RID映射信息。
本步骤可以在步骤 1004后即执行， 但在建立 RAB成功后再发起 RID注 册，可以避免 RAB建立失败后进行重定位取消时，还要到 ILR取消对该终端 RID的更新。
步骤 1007: 新 SGSN向前 SGSN返回转发重定位响应消息， 携带为该终 端分配的新的 RID;
上述步骤 1006发起的 RID注册流程和步骤 1007返回重定位请求响应消 息之间的先后顺序， 本发明不做限定。
步骤 1008: 前 SGSN收到重定位请求响应后， 根据维护的该终端的对端 信息中通信对端的 AID确定对端网关的地址，向对端网关发送 RID更新通知， 携带该终端的 AID和新的 RID;
SGSN可以才艮据该终端通信对端的 AID, 从本地配置或通信对端归属地
HLR/HSS或 DNS服务器或 ILR查询到对端网关如 SGSN、 GGSN, 边界网关 等的地址信息。 如果是发送到对端 SGSN, 则对端 SGSN还要向相应的对端 GGSN发送 RID更新通知， 对端 GGSN收到该通知后， 将保存的该终端的 AID-RID映射信息中的 RID更新为该新的 RID。
前 SGSN在到对端的 RID更新流程开始后， 对于所有已登记和新登记 的通信对端， 都将向其接入的网关发送 RID更新通知， 以确保该终端所有通 信对端发送的报文都能路由到新 GGSN。 各实施例中， SGSN在维护对端信 息时，如可以通过流实时检测机制和 /或检查该终端的数据报文中的 AID等方 式来发现新的通信对端或需删除的通信对端， 将新的通信对端的 AID登记到 该终端的对端信息中， 将需删除通信对端的 AID从对端信息中删除， GGSN 也同此。 前 SGSN可以在传送该对端信息到新 SGSN后停止维护。 在另一个 示例中， 也可以通过触发一个定时器， 对在此定时器定时期间内收到的报文 进行检测和 /或检查， 定时器到时后的再收到的报文都将丟弃。
步骤 1009: 前 SGSN发送重定位命令消息给源 RNC,执行重定位执行过 程， 同步骤 306到 310;
对上述步骤 1008前 SGSN发送 RID更新通知和步骤 1009前 SGSN发送 重定位命令的先后顺序， 本发明不做限定。
步骤 1010: 目标 RNC检测到 UE发送的 RRC消息如物理通道重新配置 完成消息或无线承载释放完成消息后， 向新 SGSN发送重定位完成消息， 同 步骤 311 ;
步骤 1011 : 新 SGSN向前 SGSN发送转发重定位完成消息， 前 SGSN向 新 SGSN返回转发重定位完成证实消息， 同步骤 313;
前 SGSN通过转发重定位完成证实消息将维护的该终端的对端信息传达 到新 SGSN, 新 SGSN保存该对端信息并进行维护。 在其他示例中， 前 SGSN 也可以通过转发 SRNS上下文消息或其他新增的消息将该对端信息传送到新 SGSN。
步骤 1012:前 SGSN收到消息后，通知源 RNC释放 Iu口，通知前 GGSN 删除相关承载；
前 GGSN 收到删除相关承载的通知后， 还删除本地维护的该终端的 AID-RID映射信息， 删除该终端通信对端中与接入前 GGSN的其他终端已没 有通信关系的通信对端的 AID-RID映射信息。 步骤 1013: 路由更新流程， 同现有重定位流程的步骤 315, 但可以增加 将 HLR/HSS中 GGSN地址更新为新 GGSN的地址， 如果 HLR保存终端的 RID信息的话， 还可以增加对该终端 RID信息的更新。
本实施例切换过程中的数据转发路径可以同现有技术， 前 GGSN收到的 下行报文通过前 SGSN到达源 RNC,再通过源 RNC与目标 RNC之间的转发 通道转发给终端。
上述流程中， 前 SGSN还可以从前 GGSN获取该终端所有通信对端的 AID-RID映射信息， 通过与新 SGSN之间的消息如转发重定位完成证实消息 传送到新 SGSN, 可以与对端信息一起传送。 新 SGSN再将该 AID-RID映射 信息通过 PDP承载建立消息或新增的消息发送到新 GGSN保存。
切换完成后， 终端将通过目标 RNC、新 SGSN和新 GGSN与外部的分组 数据网络通信， 由新 GGSN进行报文的 RID封装、 解封装和转发， 从而实现 了无固定锚点的切换， 可以避免路由迂回。
上述流程还可以有其他的变例， 如下：
变例一
该变例中， 由新 SGSN来发送 RID更新通知， 又有多种方式： 方式一
在步骤 1003 , 前 SGSN通过转发重定位请求消息将终端的对端信息传送 到新 SGSN, 新 SGSN保存该对端信息；
在步骤 1007, 新 SGSN向前 SGSN返回转发重定位响应消息时不携带为 终端分配的新的 RID, 另， 需要根据保存的对端信息向对端网关发送 RID更 新通知。
取消步骤 1008。
本方式下， 前 SGSN传送对端信息之后可以继续进行实时流检测， 将发 现的新的通信对端的 AID通知新 SGSN。 该检测可以在收到转发重定位响应 消息时或再延迟一定时间后结束。
方式二 在步骤 1007, 新 SGSN向前 SGSN返回转发重定位响应消息时不携带为 终端分配的新的 RID;
取消步骤 1008。
前 SGSN收到转发重定位响应消息之后， 通过原流程的消息如转发重定 位完成证实消息， 转发 SRNS上下文消息， 或者通过新增消息， 将维护的该 终端的对端信息传送到新 SGSN, 新 SGSN收到后向对端发起 RID更新。
本方式下， 由于前 SGSN是在新 SGSN或新 GGSN到 ILR更新注册之后 再传送对端信息的， 因此新增的通信对端会将下行报文发送到新 GGSN, 前 SGSN传送后不必再对报文进行检测或检查了。
变例二
该变例中，对端信息在 GGSN中维护，新 GGSN在为终端分配新的 RID, 到该终端归属 ILR注册该终端新的 RID后，通过新 SGSN、前 SGSN向前 GGSN 发送信息请求，前 GGSN收到该信息请求后，将该终端的对端信息经前 SGSN、 新 SGSN传送到新 GGSN。 新 GGSN在到 ILR注册后就可能会收到该终端的 报文， 新 GGSN为该终端分配新的 RID后， 根据收到的该终端的报文对该终 端的对端信息进行维护 （如检测 ^艮文中通信对端的 AID和 /或进行实时流检 测， 此时可能会通过新的通信对端从 ILR查询到新的 RID ) , 收到传送来的 对端信息后， 将收到的和本地维护的该终端的对端信息合并。
上述前 SGSN传送到新 SGSN的也可以是该终端通信对端的 AID-RID映 射信息（包含对端信息），或同时包括对端信息和该终端通信对端的 AID-RID 映射信息。
如果 GGSN之间存在信令接口，上述信息可以直接通过 GGSN之间的信 令接口来传达。
实施例四
本实施例可适用于上述架构一和架构三， 重定位过程中 GGSN 改变，
GGSN维护对端信息和发起到对端的 RID更新，通过 GGSN之间信令接口建 立前 GGSN和新 GGSN之间的转发通道，利用该转发通道转发切换过程中该 终端的下行数据报文。 如图 11所示， 本实施例 PS域的联合硬切换和终端跨 SGSN、 GGSN的 重定位流程包括：
步骤 1101-1303: 同现有重定位流程的步骤 301~303；
步骤 1104~1107： 同步骤 1004~1007, 新 SGSN为该终端选择新 GGSN, 和该新 GGSN 交互建立该终端的 PDP承载并将该终端的 AID传送给新 GGSN, 新 GGSN为终端分配新的 RID并将该新的 RID传送到新 SGSN; 新 SGSN与目标 RNC交互建立该终端的 RAB后，到 ILR注册该终端新的 RID, 并通过转发重定位请求响应消息将该新的 RID传送到前 SGSN;
基于架构二时， 需由新 GGSN分配新的 RID后 , 到 ILR注册该终端新的 RID。
步骤 1108: 前 SGSN向前 GGSN发送信令， 通知该终端 RID发生了更 新， 携带该终端的 AID和新的 RID; 前 GGSN收到该信令后， 与新 GGSN建 立该终端的转发通道， 根据维护的该终端的对端信息向对端网关发送 RID更 新通知，并将该终端的对端信息和 /或该终端的通信对端的 AID-RID映射信息 传送到新 GGSN;
前 GGSN可以根据新的 RID获取新 GGSN的地址信息，从而建立起与新 GGSN之间的转发通道。前 GGSN或新 GGSN中维护有该终端的对端信息和 该终端的通信对端的 AID-RID映射信息， 因此可以直接从本地查找到通信对 端的 RID , 获取对端网关如 GGSN的地址信息。
该步中，也可以由前 GGSN将该终端的对端信息和 /或该终端的通信对端 的 AID-RID映射信息传送到新 GGSN,如通过建立转发通道时前 GGSN发送 到新 GGSN的信令来携带，新 GGSN可以根据传送来的对端信息中通信对端 的 AID发起到相应对端网关的 RID更新流程。 此外， 新 GGSN为终端分配 RID后就可以通过检查该终端的 ^艮文等方式开始对该终端的对端信息进行维 护， 收到前 GGSN传送来的对端信息后， 将收到的和本地维护的该终端的对 端信息合并。该终端通信对端的 AID-RID映射信息可以和连接信息一起传送， 也可以釆用在前 GGSN和新 GGSN分别维护，由新 GGSN进行合并的方式处 理。 前 GGSN与新 GGSN的转发通道建立后，前 GGSN收到的发送给该终端 的报文就直接转发到新 GGSN, 新 GGSN收到后通过新 SGSN发送到目标 RNC, 前 GGSN传送对端信息前可由前 GGSN解 RID封装， 维护对端信息， 之后可由新 GGSN来解 RID封装， 维护对端信息。新 GGSN收到的发送给终 端的数据报文通过新 SGSN发送到目标 RNC。不必再通过源 RNC向目标 RNC 转发数据了。 至于终端发送的数据报文， 在切换到目标 RNC前， 还是经源 RNC、 前 SGSN、 前 GGSN转发到广义转发平面， 在切换到目标 RNC后， 则 可以经目标 RNC , 新 SGSN和新 GGSN转发。
可选地， 前 GGSN在收到上述信令后触发一个定时器， 在定时器到时之 前所有已登记和新登记的通信对端， 前 SGSN都将向其接入的网关发送 RID 更新通知。
步骤 1109, 基本同现有重定位流程的重定位执行过程， 只是釆用 GGSN 之间转发数据的方式， 源 RNC不需要向目标 RNC转发数据；
步骤 1110-1111 , 同现有重定位流程的步骤 311-312;
步骤 1112: 同步骤 1012, 前 SGSN和前 GGSN释放相关资源； 步骤 1113: 同步骤 1013 , 路由更新流程， 增加将 HLR/HSS中 GGSN地 址更新为新 GGSN的地址， 还可以增加对该终端 RID信息的更新。
实施例四的上述流程还可以有其他的变例， 例如：
变例一
该变例与上述流程建立 GGSN之间转发通道的方式不同。 本变例中， 由 前 SGSN在向新 SGSN发送转发重定位请求时， 将前 GGSN的地址信息传送 给新 SGSN, 新 SGSN在与新 GGSN建立该终端的 PDP承载时， 再将该地址 信息传送给新 GGSN, 新 GGSN获取到前 GGSN的地址信息后， 与前 GGSN 之间建立该终端的转发通道。 此时， 前 SGSN不需要将新的 RID传送到前 GGSN, 也不需要发送信令， 告知前 GGSN该终端 RID发生了更新。 此时， 如是由 GGSN发起到 ILR的更新注册，新 GGSN不需要将该新的 RID传送到 新 SGSN。
其他如对端信息传送、 RID更新可以釆用上述流程中提到的方式。 并且， 新 GGSN可以通过检查前 GGSN转发的发给该终端的数据报文中通信对端的 AID, 如发现新的通信对端或 RID更新未成功的通信对端， 向这些通信对端 接入的网关发送或重发 RID更新通知， 保证对端都能够成功更新。 新的通信 对端的 AID也要登记到该终端的对端信息中。 此时， 对前 GGSN收到的下行 数据报文， 可以转发给新 GGSN, 由新 GGSN来解 RID封装。 这对于实施例 四的流程也是适用的。
上述两个实施例的一些技术手段也可以结合起来， 得到新的实施例， 例 如， 在釆用实施例三中由 SGSN维护终端的对端信息和发起到对端的 RID更 新时， 可以同时釆用实施例四及其变例中提到的在 GGSN之间建立转发通道 的方法建立前 GGSN和新 GGSN之间的转发通道，对端信息的传送和 RID更 新方式同实施例三， 而下行数据 文的转发则同实施例四。
实施例五
本实施例在重定位过程中， GGSN改变， 在重定位完成过程再进行 AID 和 RID相关处理。
如图 12所示， 本实施例 PS域的联合硬切换和终端跨 SGSN、 GGSN的 重定位流程包括：
步骤 1201-1210: 同现有重定位流程的步骤 301~310；
步骤 1211 : 同现有重定位流程的步骤 311 , 终端发送 RRC消息如物理通 道重新配置完成消息或无线承载释放完成消息给目标 RNC, 目标 RNC向新 SGSN发送重定位完成消息， 发起重定位完成过程；
步骤 1212: 新 SGSN向前 SGSN发送转发重定位完成消息；
步骤 1213: 前 SGSN向新 SGSN回转发重定位完成证实消息； 可选地， 前 SGSN将该终端的对端信息和 /或该终端通信对端的 AID-RID 映射信息携带在重定位完成确认消息中发送给新 SGSN, 前 SGSN可以从前 GGSN获取上述信息。
步骤 1214: 新 SGSN收到转发重定位完成证实消息后， 为该终端选择新 的 GGSN, 和该新 GGSN之间建立该终端的 PDP承载并将该终端的 AID传 送给新 GGSN, 新 GGSN为终端分配新的 RID, 并传送到新 SGSN; 基于架构二时， 由新 GGSN向该终端归属 ILR发送注册请求； 基于架构 一和架构三时， 由 SGSN向该终端归属 ILR发送注册请求。
新 SGSN会保存收到的对端信息并进行维护， 新 SGSN如收到该终端通 信对端的映射信息， 还需发送到新 GGSN保存， 如通过承载建立的消息或新 增的消息来发送。
步骤 1215: 新 SGSN向前 SGSN发送更新对端信息请求， 携带该终端新 的 RID;
步骤 1216: 前 SGSN收到该新的 RID后， 发起到对端的 RID更新流程， 同步骤 1008;
前 SGSN在步骤 1213如传送了对端信息，可以同时在本地保留该对端信 息， 完成到对端的 RID更新后删除该对端信息。 当然， 在步骤 1213也可以不 传送对端信息，在步骤 1216完成到对端的 RID更新流程后再将该终端的对端 信息传送给新 SGSN如通过更新对端信息请求的响应消息来传送。
步骤 1217: 前 SGSN通知前 GGSN删除相关承载， 通知源 RNC释放 Iu 口， 同步骤 1012。
步骤 1218: 路由更新流程， 同步骤 1013。
实施例五的上述流程还可以有其他的变例， 例如：
变例一
该变例中， 在重定位准备过程中， 新 SGSN在收到前 SGSN发送的重定 位请求消息后， 可以先为该终端选择新的 GGSN, 并和该新 GGSN之间建立 该终端的 PDP承载。在重定位完成过程中， 新 SGSN不再进行 GGSN选择和 建立 PDP承载的处理， 其他同上述实施例五及其他变例。
根据发起到对端的 RID更新的网元的不同， 可以得到以下几个变例： 变例二
该变例中， 在新 GGSN或新 SGSN发起到 ILR的 RID注册流程之后， 由 新 GGSN向前 GGSN, 或者由新 SGSN向前 SGSN请求对端信息， 在收到对 端信息之后， 才艮据收到的对端信息中通信对端的 AID确定对端网关的地址， 向对端网关发送 RID更新通知。 变例三
本变例对端信息在 GGSN上维护， 在实施例五的基础上， 在步骤 1216, 前 SGSN收到新分配的 RID后 ,不发起 RID更新流程， 而是将新的 RID发送 到前 GGSN, 由前 GGSN根据保存的该终端的对端信息来发起到对端的 RID 更新流程，或者由前 GGSN将保存的对端信息传送到新 SGSN后，由新 SGSN 来发起到对端的 RID更新流程。 具体可参照实施例四及其变例。 前 GGSN还 可以根据该新的 RID建立与新 GGSN的转发通道，将切换过程中通信对端发 送给该终端的报文转发到新 GGSN。
变例四
由前 SGSN向新 SGSN发送转发重定位完成证实消息或之前发送的消息 如转发重定位请求时， 将前 GGSN的地址信息传送给新 SGSN, 新 SGSN在 与新 GGSN建立该终端的 PDP承载时， 再将该地址信息传送给新 GGSN, 新 GGSN获取到前 GGSN的地址信息后， 与前 GGSN之间建立该终端的转发通 道。
在 RID 更新和对端信息传送上， 新 GGSN 可以将新的 RID传送给前
GGSN如通过转发通道建立流程的消息来传送， 前 GGSN收到该新的 RID后 发起到对端的 RID更新， 并将前 GGSN维护的该终端的对端信息传送到新 GGSN。 或者， 由前 GGSN将维护的该终端的对端信息 （和 /或该终端通信对 端的 AID-RID映射信息 )传送到新 GGSN如携带在隧道建立流程的消息中， 新 GGSN根据该对端信息来发起到对端的 RID更新。并且，新 GGSN可以通 过检查前 GGSN转发的发给该终端的数据报文来获知新增的通信对端， 以及 RID更新未成功的通信对端，向这些通信对端接入的网关发送和再次发送 RID 更新通知。
对于联合的小区/ URA和服务 RNS重定位的流程，其与 PS域的联合硬切 换和终端跨 SGSN的重定位流程的区别在于无线侧， 因此不影响上述实施例 的描述。因此，本发明提到的切换可以基于 PS域的联合硬切换和终端跨 SGSN 的重定位流程， 也可以基于联合的小区/ URA和服务 RNS重定位的流程。
相应地， 本发明还提供了一种 WCDMA核心网， 包括关口 GPRS节点 (GGSN), 服务 GPRS节点 (SGSN)、 归属用户签约寄存器 (HLR/HSS)和身份位 置寄存器 (ILR), 其中：
SGSN设置成在涉及 SGSN间服务无线网络子系统 (SRNS)重定位的终端 切入过程中， 选择 GGSN, 在选择了新关口 GPRS节点 (GGSN)时， 还为该终 端建立新 SGSN与该新 GGSN之间的 PDP承载并将该终端的 AID传送给该 新 GGSN;
GGSN设置成为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；
GGSN或 SGSN还设置成向切入终端归属 ILR发送 RID注册请求， 携带 该新的 RID, 以使该终端的归属 ILR更新保存的该终端的 RID。
以上流程中关于 RID注册、 RID更新、 对端信息的维护和传递、 映射信 处的维护的传递、 GGSN隧道的建立等除相互构成抵触外， 均可任意组合使 用， 相应得到的 GGSN和 SGSN的功能模块列举如下， 并对特殊的场景进行 了限定。
进一步地， SGSN包括：
切出控制模块， 其设置成： 在涉及 SGSN间服务无线网络子系统 (SRNS) 重定位的切换过程中， 收到源无线侧网元发送的针对切出终端的重定位请求 后， 向新 SGSN发送转发重定位请求， 以及， 在收到目标 SGSN发送的转发 重定位完成消息后， 向该目标 SGSN回复转发重定位完成证实消息；
切入控制模块， 其设置成在涉及 SGSN间服务无线网络子系统 (SRNS)重 定位的切换过程中， 收到前 SGSN发送的针对切入终端的转发重定位请求或 转发重定位完成证实消息后， 选择 GGSN, 以及在选择了新 GGSN时， 为该 切入终端建立本 SGSN与新 GGSN间的 PDP承载， 将该切入终端的 AID传 送给新 GGSN;
报文转发模块， 其设置成在 GGSN和无线侧网元间转发切入终端和切出 终端的数据报文；
GGSN包括：
切出控制模块， 其设置成在终端切出后， 释放为该切出终端分配的资源； 切入控制模块， 其设置成： 在收到前 SGSN发送的转发重定位请求和新 SGSN传送的切入终端的 AID后， 调用 RID分配模块， 为该切入终端建立与 该新 SGSN之间的 PDP承载；
RID分配模块， 其设置成为切入终端分配指向本 GGSN的新的 RID, 保 存该切入终端 AID与该新的 RID的映射信息；
报文转发模块， 其设置成对切入终端、 切出终端的数据报文进行转发处 理。
进一步地， SGSN还包括 RID注册模块， 该 RID注册模块设置成： 向切 入终端归属身份位置寄存器 (ILR)发送注册请求，携带该切入终端的 AID和新 的 RID; GGSN的切入控制模块还设置成将为切入终端分配的新的 RID传送 到新 SGSN; SGSN的切入控制模块还设置成在收到该新的 RID后，调用 RID 注册模块； 或者
GGSN还包括 RID注册模块， 该 RID注册模块设置成： 向切入终端归属 身份位置寄存器 (ILR)发送注册请求， 携带该切入终端的 AID和新的 RID; GGSN的切入控制模块还设置成获得切入终端新的 RID后调用该 RID注册模 块。
进一步地， （对应 SGSN维护对端信息的场景 )
SGSN还包括对端信息维护模块， 该对端信息维护模块设置成： 维护终 端的对端信息，该对端信息包含该终端 AID及其通信对端 AID的对应关系信 息；
SGSN 的切出控制模块还设置成： 在切换过程中， 将维护的切出终端的 对端信息传送到新 SGSN并通知对端信息维护模块停止维护；
SGSN的切入控制模块还设置成： 在切换过程中， 接收前 SGSN传送的 切入终端的对端信息， 通知本 SGSN的对端信息维护模块保存和维护；
SGSN还包括 RID更新模块， 该 RID更新模块设置成： 根据切入终端或 切出终端的对端信息中通信对端的 AID查找到通信对端接入的网关的地址， 向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。
进一步地， （对应 SGSN维护对端信息和前 SGSN发起 RID更新的场景 )
GGSN的切入控制模块还设置成将为切入终端分配的新的 RID传送到新 SGSN;
SGSN的切出控制模块还设置成： 在收到新 SGSN传送的切出终端的新 的 RID后，调用 RID更新模块为切出终端发起到对端的 RID更新； 及通过转 发重定位完成证实消息或转发 SRNS上下文消息或新增消息将维护的切出终 端的对端信息传送到新 SGSN;
SGSN的切入控制模块是设置成在收到前 SGSN发送的针对切入终端的 转发重定位请求选择 GGSN,且还设置成在收到新 GGSN发送的新的 RID后， 通过转发重定位响应消息将该新的 RID传送到前 SGSN。
进一步地， （对应 SGSN维护对端信息和新 SGSN发起 RID更新的场景 ) GGSN的切入控制模块还设置成将为切入终端分配的新的 RID传送到新
SGSN;
SGSN的切出控制模块还设置成在收到新 SGSN返回的转发重定位响应 消息后，通过转发重定位完成证实消息或转发 SRNS上下文消息或新增消息， 将维护的切出终端的对端信息传送到新 SGSN; SGSN的切入控制模块是设置成在收到前 SGSN发送的针对切入终端的 转发重定位请求后选择 GGSN, 且还设置成在收到前 SGSN传送的切入终端 的对端信息后， 调用 RID更新模块为切入终端发起到对端的 RID更新。
进一步地， （对应 GGSN维护对端信息的场景 )
GGSN还包括对端信息维护模块， 该对端信息维护模块设置成维护终端 的对端信息， 包含该终端 AID及其通信对端 AID的对应关系信息；
GGSN的切出控制模块还设置成在切换过程中， 将维护的切出终端的对 端信息传送到新 GGSN;
GGSN的切入控制模块还设置成： 在切换过程中， 接收前 GGSN传送的 切入终端的对端信息， 通知本 GGSN的对端信息维护模块保存和维护；
GGSN还包括 RID更新模块，该 RID更新模块设置成根据维护的切入终 端或切出终端的对端信息中通信对端的 AID查找到对应的 RID, 向通信对端 接入的网关发送 RID更新通知 , 携带该终端 AID和新的 RID。
进一步地， （对应 GGSN维护对端信息和新 GGSN发起 RID更新的场景 ) GGSN的切入控制模块还设置成： 在 RID分配模块为切入终端分配新的 RID后， 通过新 SGSN、 前 SGSN向前 GGSN发送信息请求； 及在收到传送 来的切入终端的对端信息后， 调用 RID 更新模块为切入终端发起到对端的 RID更新；
GGSN的切出控制模块还设置成： 在收到前 GGSN发送的信息请求后， 将维护的切出终端的对端信息和 /或该终端通信对端的 AID-RID 映射信息经 前 SGSN、 新 SGSN传送到新 GGSN。
进一步地， （对应 GGSN维护对端信息和前 GGSN发起 RID更新的场景 )
GGSN的切入控制模块还设置成将为切入终端分配的新的 RID传送给前 GGSN;
GGSN的切出控制模块还设置成： 在收到新 GGSN传送的切出终端新的 RID后， 调用 RID更新模块为切出终端发起到对端的 RID更新， 在更新完成 后，将维护的该终端的对端信息和 /或该终端的通信对端的 AID-RID映射信息 传送到新 GGSN。
进一步地， （对应 GGSN维护对端信息和新 GGSN发起 RID更新的场景 )
GGSN的切出控制模块还设置成： 在与新 GGSN建立转发隧道时或在该 转发隧道建立后，将切出终端的对端信息和 /或该终端通信对端的 AID-RID映 射信息传送到新 GGSN; GGSN的切入控制模块还设置成在收到前 GGSN传 送的切入终端的对端信息后， 调用 RID 更新模块为切入终端发起到对端的 RID更新。
进一步地， GGSN还包括映射信息维护模块， 该映射信息维护模块设置 成： 在切换过程中， 收到切入终端的数据报文后即在本地维护该切入终端的 通信对端的 AID-RID 映射信息， 将前 GGSN传送的该终端的通信对端的 AID-RID映射信息和本地维护的该 AID-RID映射信息合并；
GGSN的切出控制模块还设置成在切换过程中， 将维护的切出终端的通 信对端的 AID-RID映射信息传送到新 GGSN;
GGSN的切入控制模块还设置成： 在切换过程中， 接收前 GGSN传送的 切入终端的通信对端的 AID-RID映射信息， 并通知本 SGSN的映射信息维护 模块保存和维护。
进一步地， GGSN的报文转发模块是设置成将收到的发给切出终端的数 据报文转发给前 SGSN, 将收到的发给切入终端的数据报文转发给新 SGSN; SGSN 的报文转发模块将收到的发给切出终端的数据报文转发到源无线侧网 元， 将发给切入终端的数据报文转发到目标无线侧网元； 或者
GGSN还包括转发通道建立模块， 该转发通道建立模块设置成： 在切换 过程中为切入终端建立本 GGSN和原 GGSN之间的转发通道，或为切出终端 建立本 GGSN和新 GGSN之间的转发通道； GGSN的报文转发模块设置成通 过如下方式转发数据报文： 在收到发给切出终端的数据报文后， 经该转发通 道发给前 GGSN,及收到发给切入终端的数据报文后，转发给新 SGSN; SGSN 的报文转发模块将收到的发给切出终端的数据报文转发到源无线侧网元， 将 收到的发给切入终端的数据报文转发到目标无线侧网元。
进一步地， SGSN的切入控制模块是设置成在收到前 SGSN发送的针对 切入终端的转发重定位请求后选择 GGSN, 且还设置成： 通过转发重定位响 应将新 GGSN 的地址信息传送到前 SGSN; SGSN 的切出控制模块收到新 GGSN的的地址信息后传送给前 GGSN; GGSN还包括转发通道建立模块， 该转发通道建立模块设置成： 收到前 SGSN传送的新 GGSN的地址信息后， 与该新 GGSN交互， 建立与新 GGSN间切出终端的转发通道； 或者
SGSN的切入控制模块是设置成在收到前 SGSN发送的针对切入终端的 转发重定位请求后选择 GGSN; SGSN的切出控制模块还设置成：在向新 SGSN 发送转发重定位请求时， 将前 GGSN的地址信息传送给新 SGSN; SGSN的 切入控制模块还设置成在与新 GGSN建立终端的 PDP承载时将收到的前 GGSN的地址信息传送给新 GGSN; GGSN还包括转发通道建立模块， 该转 发通道建立模块设置成在收到前 GGSN的地址信息后， 与前 GGSN交互， 建 立与前 GGSN间切入终端的转发通道。
进一步地， SGSN的切出控制模块是在向新 SGSN发送转发重定位完成 证实消息或转发重定位请求时，将前 GGSN的地址信息传送给新 SGSN; SGSN 的切入控制模块是在与新 GGSN建立切入终端的 PDP承载时将收到的前 GGSN的地址信息传送给新 GGSN; GGSN还包括转发通道建立模块； GGSN 的切入控制模块收到前 GGSN的地址信息后，调用转发通道建立模块； GGSN 的转发通道建立模块设置成与前 GGSN之间交互建立切入终端的转发通道。
进一步地， （对应 GGSN维护对端信息的场景 )
GGSN的对端信息维护模块还设置成： 在保存前 GGSN传送来的切入终 端的对端信息后， 检查前 GGSN转发来的发给该切入终端的数据报文中通信 对端的 AID , 如发现新的通信对端或 RID更新未成功的通信对端， 将新的通 信对端或 RID更新未成功的通信对端的 AID登记到该切入终端的对端信息 中， 并向本 GGSN的切入控制模块发更新通知， 携带这些通信对端的 AID;
GGSN的切入控制模块还设置成收到对端信息维护模块发送的更新通知 后，调用 RID更新模块向这些通信对端接入的网关发送和重发 RID更新通知。
进一步地， GGSN的 RID更新模块根据该终端的对端信息中通信对端的 AID 查找到通信对端接入的网关的地址信息时， 是根据该终端通信对端的 AID从本地配置或通信对端归属签约服务器 (HLR/HSS)或 DNS服务器或 ILR 查询到通信对端接入的网关的地址信息。
进一步地， SGSN的切入控制模块是根据终端的位置信息和 /或网络配置 信息来判断是否选择新的 GGSN, 如该新 SGSN和前 SGSN在物理连接上连 接着不同的 GGSN,则该新 SGSN选择新的 GGSN;如果新 SGSN和前 SGSN 连接着相同的多个 GGSN, 则新 SGSN根据终端所在位置区域和 /或 APN来 做选择判断。
进一步地， SGSN或 GGSN的对端信息维护模块在维护对端信息时， 是 通过流实时检测机制和 /或通过检查该终端的数据报文中的 AID, 将发现的新 的通信对端的 AID登记到该终端的对端信息中， 将需删除的通信对端的 AID 从该对端信息中删除。
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。
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
与现有技术相比， 本发明可以支持终端的身份标识与位置分离， 避免路 由迂回， 并且可以尽量基于现有重定位流程， 不影响现有重定位流程的一致 性， 具有较好的可行性。

Claims

权 利 要 求 书
1、 一种基于宽带码分多址 WCDMA核心网的切换方法， 包括： 在涉及服务 GPRS节点 SGSN间服务无线网络子系统 SRNS重定位的终 端切换过程中， 新 SGSN如果选择了新关口 GPRS节点 GGSN, 则为终端建 立新 SGSN与新 GGSN之间的分组数据协议 PDP承载并将终端的身份标识 AID传送给所述新 GGSN;
所述新 GGSN为终端分配新的位置标识 RID, 并保存所述终端的身份标 识 AID与新的 RID的映射信息；
所述新 GGSN或新 SGSN向终端归属的身份位置寄存器 ILR发送 RID注 册请求， 携带所述新的 RID, 所述终端的归属 ILR更新保存的该终端的 RID; 以及
切换完成后， 释放前 SGSN和前 GGSN间与所述终端相关的承载， 所述 终端通过新 SGSN和新 GGSN连接到外部的分组数据网络。
2、 如权利要求 1所述的切换方法， 还包括：
所述前 SGSN保存并维护终端的对端信息， 该对端信息包括终端的 AID 与该终端的通信对端的 AID的对应关系信息；
在切换过程中， 所述前 SGSN 将所述终端的对端信息传送到所述新 SGSN;
所述前 SGSN或新 SGSN根据所述终端的对端信息中通信对端的 AID, 查找到该通信对端接入的网关的地址信息， 向所述通信对端接入的网关发送 RID更新通知， 携带所述终端的 AID和所述新的 RID。
3、 如权利要求 1所述的切换方法， 还包括：
前 GGSN保存并维护终端的对端信息和该终端的通信对端的 AID-RID映 射信息，该对端信息包含终端的 AID与该终端的通信对端的 AID的对应关系 信息；
在切换过程中，前 GGSN将所述终端的对端信息和 /或所述终端的通信对 端的 AID-RID映射信息经 GGSN之间的接口， 或者经前 SGSN、 新 SGSN传 送到新 GGSN; 所述前 GGSN或新 GGSN从本地或从映射服务器查找所述终 端的通信对端的 RID , 向所述通信对端接入的网关发送 RID更新通知， 携带 所述终端的 AID和所述新的 RID。
4、 如权利要求 1或 2所述的切换方法， 还包括：
所述前 GGSN保存并维护所述终端的通信对端的 AID-RID映射信息； 在切换过程中，所述前 GGSN将所述终端的通信对端的 AID-RID映射信 息传送到新 GGSN, 所述新 GGSN在收到所述终端的数据报文后在本地保存 并维护所述终端的通信对端的 AID-RID映射信息，并在收到所述前 GGSN传 送的 AID-RID映射信息后，将收到的映射信息和本地维护的 AID-RID映射信 息合并。
5、 如权利要求 1或 2或 3所述的切换方法， 还包括：
在切换过程中， 前 GGSN收到发给终端的数据报文后， 将收到的数据报 文经前 SGSN发给源无线侧网元， 该数据报文经过源无线侧网元和目标无线 侧网元间的转发通道被转发到目标无线侧网元， 由目标无线侧网元发给所述 终端； 或者
在切换过程中，建立前 GGSN和新 GGSN之间的转发通道，前 GGSN收 到发给所述终端的数据报文后， 将收到的数据报文经建立的转发通道发送给 新 GGSN, 新 GGSN再将该数据报文经新 SGSN发给目标无线侧网元， 由该 目标无线侧网元将该数据报文发给所述终端。
6、 如权利要求 1或 2或 3所述的切换方法， 其中，
新 SGSN是在收到前 SGSN 的转发重定位请求后， 为该终端选择新 GGSN,与选择的新 GGSN交互建立终端的 PDP承载并将该终端的 AID传送 给新 GGSN, 新 GGSN是在收到终端的 AID后才为该终端分配新的 RID; 所述新 GGSN或新 SGSN向终端归属的 ILR发送 RID注册请求的步骤包 括：新 GGSN直接向终端归属的 ILR发送 RID注册请求，或者，所述新 GGSN 通过 PDP承载建立消息或新增消息将所述新的 RID传送到新 SGSN,新 SGSN 与目标无线网络控制器 RNC交互建立终端的无线接入承载 RAB后， 向该终 端归属的 ILR发送 RID注册请求， 并向前 GGSN返回转发重定位响应消息。
7、 如权利要求 2所述的切换方法， 还包括：
新 GGSN将所述新的 RID传送到新 SGSN, 所述新 SGSN通过转发重定 位响应消息将所述新的 RID发送到前 SGSN; 其中， 所述前 SGSN是收到所 述新的 RID后，根据维护的所述终端的对端信息中通信对端的 AID查找到通 信对端接入的网关的地址信息， 向所述通信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；
前 SGSN将所述终端的对端信息传送到所述新 SGSN的步骤中， 所述前 SGSN是通过转发重定位完成证实消息或转发 SRNS上下文消息或新增消息 将当前维护的该终端的对端信息传送到新 SGSN;
所述方法在前 SGSN将所述终端的对端信息传送到所述新 SGSN的步骤 之前还包括： 该前 SGSN如发现所述终端有新的通信对端， 在所述终端的对 端信息中登记该新的通信对端的 AID 并向该新的通信对端接入的网关发送 RID更新通知。
8、 如权利要求 2所述的切换方法， 其中，
前 SGSN是在收到新 SGSN返回的转发重定位响应消息后， 通过重定位 完成过程中发送到新 SGSN的转发重定位完成证实消息或转发 SRNS上下文 消息或新增消息， 将所述终端的对端信息传送到所述新 SGSN。
9、 如权利要求 3所述的切换方法， 还包括：
新 GGSN在为终端分配新的 RID后，通过新 SGSN、前 SGSN向前 GGSN 发送信息请求； 其中， 所述前 GGSN是在收到所述信息请求后， 将所述终端 的对端信息和 /或所述终端的通信对端的 AID-RID 映射信息经前 SGSN、 新 SGSN传送到所述新 GGSN, 所述新 GGSN是根据收到的对端信息中通信对 端的 AID查询到通信对端的 RID,向通信对端接入的网关发送 RID更新通知。
10、 如权利要求 5所述的切换方法， 其中， 建立前 GGSN和新 GGSN之 间的转发通道的步骤为： 通过以下方式中的任一种在前 GGSN和新 GGSN间 建立所述终端的转发通道：
方式一， 新 SGSN通过转发重定位响应将新 GGSN的地址信息发送到前 SGSN, 前 SGSN将新 GGSN的地址信息传送给前 GGSN; 前 GGSN根据新 GGSN的地址信息与所述新 GGSN交互， 建立与新 GGSN间该终端的转发通 道；
方式二， 前 SGSN在向新 SGSN发送转发重定位请求时， 将前 GGSN的 地址信息传送给新 SGSN, 新 SGSN在与新 GGSN建立终端的 PDP承载时将 前 GGSN的地址信息传送给新 GGSN,新 GGSN根据所述前 GGSN的地址信 息与前 GGSN交互， 建立与前 GGSN间该终端的转发通道。
11、 如权利要求 10所述的切换方法， 其中，
当所述转发通道釆用方式一建立时， 所述新 GGSN的地址信息为所述终 端的新的 RID; 或者， 当所述转发通道釆用方式二建立时， 所述方法还包括： 新 SGSN通过转发通道建立时的消息将所述终端的新的 RID发给前 GGSN; 其中， 当权利要求 5引用权利要求 3时： 所述前 GGSN是在收到所述新 的 RID后，根据维护的该终端的对端信息和该终端的通信对端的 AID-RID映 射信息查找到通信对端的 RID, 向所述通信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; 之后， 所述前 GGSN才将所述终端的对 端信息和 /或该终端的通信对端的 AID-RID映射信息传送到所述新 GGSN。
12、 如权利要求 10所述的切换方法， 其中， 当权利要求 5引用权利要求
3时：
所述前 GGSN是在与新 GGSN建立转发通道时或在该转发通道建立后， 将该终端的对端信息和 /或该终端的通信对端的 AID-RID 映射信息传送到新 GGSN, 新 GGSN是根据传送来的对端信息中通信对端的 AID查询到通信对 端的 RID ,向所述通信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。
13、 如权利要求 1或 2或 3所述的切换方法， 其中，
新 SGSN是在重定位完成过程中收到转发重定位完成证实消息后， 为终 端选择新 GGSN,与选择的新 GGSN之间建立终端的 PDP承载并将该终端的 AID传送给新 GGSN;
所述新 GGSN或新 SGSN向终端归属的 ILR发送 RID注册请求的步骤包 括： 新 GGSN为终端分配新的 RID后， 直接向该终端归属的 ILR发送 RID 注册请求， 或者， 该新 GGSN通过 PDP承载建立消息或新增消息将所述新的 RID传送到新 SGSN, 由新 SGSN向该终端归属的 ILR发送 RID注册请求。
14、 如权利要求 2所述的切换方法， 还包括：
新 GGSN通过 PDP承载建立消息或新增消息将所述新的 RID传送到新 SGSN, 所述新 SGSN将所述新的 RID传送到前 SGSN; 其中， 所述前 SGSN 是在收到所述新的 RID后，根据维护的终端的对端信息中通信对端的 AID查 找到该通信对端接入的网关的地址信息， 向所述通信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;
所述前 SGSN在发起 RID更新流程后继续维护终端的对端信息， 在 RID 更新流程结束后， 再将维护的该终端的对端信息传送给新 SGSN进行保存和 维护。
15、 如权利要求 13所述的切换方法， 还包括：
所述新 GGSN或新 SGSN向终端归属的 ILR发送 RID注册请求后， 新 GGSN向前 GGSN, 或者由新 SGSN向前 SGSN请求对端信息。
16、 如权利要求 13所述的切换方法， 还包括：
所述新 GGSN通过 PDP承载建立消息或新增消息将所述新的 RID传送 到新 SGSN, 所述新 SGSN将该新的 RID传送到前 SGSN; 前 SGSN收到后， 将该新的 RID发送到前 GGSN;
所述前 GGSN根据保存的所述终端的对端信息中通信对端的 AID, 查找 到该通信对端接入的网关的地址信息， 向所述通信对端接入的网关发送 RID 更新通知；或者，该前 GGSN将保存的对端信息传送到新 SGSN,由该新 SGSN 根据收到的终端的对端信息中通信对端的 AID, 查找到通信对端接入的网关 的地址信息， 向所述通信对端接入的网关发送 RID更新通知。
17、 如权利要求 13或 16所述的切换方法， 还包括：
前 SGSN在向新 SGSN发送转发重定位完成证实消息或转发重定位请求 时， 将前 GGSN的地址信息传送给新 SGSN, 新 SGSN在与新 GGSN建立终 端的 PDP承载时将前 GGSN的地址信息传送给新 GGSN,新 GGSN获取到前 GGSN的地址信息后， 与前 GGSN之间建立终端的转发通道； 转发通道建立后， 前 GGSN将收到的发送给终端的报文通过该转发通道 转发到新 GGSN,新 GGSN再通过新 SGSN将该报文发送到目标无线侧网元。
18、 如权利要求 3所述的切换方法， 还包括：
新 GGSN收到前 GGSN传送来的对端信息后，检查前 GGSN转发来的发 给终端的数据报文中通信对端的 AID,如发现新的通信对端和 /或 RID更新未 成功的通信对端， 向所述新的通信对端或 RID更新未成功的通信对端接入的 网关发送和 /或重发 RID更新通知， 并将新的通信对端的 AID登记到所述终 端的对端信息中。
19、 如权利要求 1所述的切换方法， 其中，
所述涉及 SGSN 间服务无线网络子系统重定位的终端切换过程是指 PS 域的联合硬切换和终端跨 SGSN的重定位过程，或者是指联合的小区/ URA和 服务 RNS重定位的过程。
20、 如权利要求 2或 14所述的切换方法， 其中，
前 SGSN或新 SGSN根据该终端的对端信息中通信对端的 AID查找到通 信对端接入的网关的地址信息的步骤中， 是根据该终端的通信对端的 AID从 本地配置或通信对端的归属用户签约服务器或 DNS服务器或 ILR查询到该通 信对端接入的网关的地址信息；
所述方法还包括： 当查询到的所述通信对端接入的网关为 GGSN时， 该 GGSN收到 RID更新通知后， 将保存的所述终端的 AID-RID映射信息中的 RID更新为该新的 RID; 当查询到的所述通信对端接入的网关为 SGSN时， 该 SGSN收到 RID更新通知后，向该通信对端接入的 GGSN发送 RID更新通 知； 该通信对端接入的 GGSN 收到所述更新通知后再将保存的该终端的 AID-RID映射信息中的 RID更新为所述新的 RID。
21、 如权利要求 1所述的切换方法， 还包括：
在重定位完成过程终端发起的路由区更新过程中， 到该终端的归属用户 签约寄存器将该终端接入的 GGSN地址更新为该新 GGSN的地址。
22、 如权利要求 1所述的切换方法， 还包括：
新 SGSN根据终端的位置信息和 /或网络配置信息来判断是否选择新 GGSN, 如果新 SGSN和前 SGSN在物理连接上连接着不同的 GGSN, 则判 断选择新 GGSN; 如果新 SGSN和前 SGSN连接着相同的多个 GGSN, 则新 SGSN根据终端所在位置区域和 /或 APN来判断是否选择新 GGSN。
23、 如权利要求 2所述的切换方法， 其中， ：
新 GGSN如选择了新 GGSN作为重定位后要接入的 GGSN, 则前 SGSN 通过重定位准备过程中向新 SGSN发送的重定位请求消息， 或通过重定位完 成过程中向新 SGSN发送的转发重定位完成证实消息， 或通过新增消息将所 述终端的对端信息传送到所述新 SGSN。
24、 如权利要求 2或 3所述的切换方法， 其中，
所述前 SGSN或前 GGSN在维护终端的对端信息时， 通过流实时检测机 制和 /或检查该终端的数据报文中的 AID 来发现新的通信对端或需删除的通 信对端， 将新的通信对端的 AID登记到该终端的对端信息中， 将该对端信息 中需删除的通信对端的 AID删除。
25、 如权利要求 1所述的切换方法， 其中，
所述前 SGSN或前 GGSN在维护终端的对端信息时， 通过流实时检测机 制和 /或检查该终端的数据报文中的 AID,将发现的新的通信对端的 AID登记 到该终端的对端信息中， 将需删除的通信对端的 AID从该对端信息中删除。
26、 一种 WCDMA核心网， 包括关口 GPRS节点 GGSN、 服务 GPRS节 点 SGSN和归属用户签约寄存器， 其特征在于， 所述 WCDMA核心网还包括 身份位置寄存器 ILR, 其中：
所述 SGSN设置成： 在涉及 SGSN间服务无线网络子系统 SRNS重定位 的终端切入过程中， 选择 GGSN, 以及， 在选择了新 GGSN时， 为切入终端 建立本 SGSN与新 GGSN之间的 PDP承载并将该终端的身份标识 AID传送 给所述新 GGSN;
所述 GGSN设置成为切入终端分配新的位置标识 RID, 并保存该切入终 端的身份标识 AID与新的 RID之间的映射信息；
所述 GGSN或 SGSN还设置成：向切入终端归属的 ILR发送 RID注册请 求， 携带该切入终端的新的 RID, 以使该切入终端归属的 ILR更新保存的该 切入终端的 RID。
27、 如权利要求 26所述的 WCDMA核心网， 其中，
所述 SGSN包括：
切出控制模块， 其设置成： 在涉及 SGSN间 SRNS重定位的切换过程中， 收到源无线侧网元发送的针对切出终端的重定位请求后， 向新 SGSN发送转 发重定位请求， 以及， 在收到新 SGSN发送的转发重定位完成消息后， 向该 新 SGSN回复转发重定位完成证实消息；
切入控制模块， 其设置成： 在涉及 SGSN间 SRNS重定位的切换过程中， 收到前 SGSN发送的针对切入终端的转发重定位请求或转发重定位完成证实 消息后，选择 GGSN,以及，在选择了新 GGSN时，为该切入终端建立本 SGSN 与新 GGSN间的 PDP承载， 将该切入终端的 AID传送给所述新 GGSN; 以 及，
报文转发模块， 其设置成在 GGSN和无线侧网元间转发切入终端和切出 终端的数据报文；
所述 GGSN包括： 切出控制模块， 其设置成在终端切出后， 释放为该切 出终端分配的资源；
切入控制模块， 其设置成： 在收到前 SGSN发送的转发重定位请求和新 SGSN传送的切入终端的 AID后， 调用 RID分配模块， 为切入终端建立与新 SGSN之间的 PDP承载；
RID分配模块， 其设置成为切入终端分配指向本 GGSN的新的 RID, 保 存该切入终端 AID与该新的 RID的映射信息； 以及，
报文转发模块， 其设置成对切入终端、 切出终端的数据报文进行转发处 理。
28、 如权利要求 27所述的 WCDMA核心网， 其中，
所述 SGSN还包括 RID注册模块， 该 RID注册模块设置成： 向切入终端 归属的身份位置寄存器 ILR发送注册请求， 携带该切入终端的 AID和新的 RID; 所述 GGSN的切入控制模块还设置成将为切入终端分配的新的 RID传 送到新 SGSN;所述 SGSN的切入控制模块还设置成在收到所述新的 RID后， 调用所述 RID注册模块； 或者
所述 GGSN还包括 RID注册模块，该 RID注册模块设置成： 向切入终端 归属的身份位置寄存器 ILR发送注册请求， 携带该切入终端的 AID和新的 RID; 所述 GGSN的切入控制模块还设置成获得切入终端新的 RID后调用所 述 GGSN的 RID注册模块。
29、 如权利要求 28所述的 WCDMA核心网， 其中，
所述 SGSN还包括对端信息维护模块， 该对端信息维护模块设置成： 维 护终端的对端信息， 所述对端信息包含该终端的 AID与该终端的通信对端的 AID的对应关系信息；
所述 SGSN的切出控制模块还设置成： 在切换过程中， 将维护的切出终 端的对端信息传送到新 SGSN并通知对端信息维护模块停止维护该切出终端 的对端信息；
所述 SGSN的切入控制模块还设置成： 在切换过程中， 接收前 SGSN传 送的切入终端的对端信息， 通知本 SGSN的对端信息维护模块保存和维护该 切入终端的对端信息；
所述 SGSN还包括 RID更新模块， 所述 RID更新模块设置成： 根据切入 终端或切出终端的对端信息中通信对端的 AID查找到该通信对端接入的网关 的地址， 向所述通信对端接入的网关发送 RID更新通知， 携带该切入终端或 切出终端的 AID和新的 RID。
30、 如权利要求 29所述的 WCDMA核心网， 其中，
所述 SGSN的切入控制模块还设置成： 在收到新 GGSN发送的新的 RID 后， 通过转发重定位响应消息将该新的 RID传送到前 SGSN;
所述 SGSN的切出控制模块还设置成： 在收到新 SGSN传送的切出终端 的新的 RID后，调用 RID更新模块为切出终端发起到对端的 RID更新；以及， 通过转发重定位完成证实消息或转发 SRNS上下文消息或新增消息将维护的 切出终端的对端信息传送到新 SGSN;
所述 SGSN的切入控制模块是设置成在收到前 SGSN发送的针对切入终 端的转发重定位请求后选择 GGSN。
31、 如权利要求 29所述的 WCDMA核心网， 其中，
所述 SGSN的切出控制模块还设置成在收到新 SGSN返回的转发重定位 响应消息后， 通过转发重定位完成证实消息或转发 SRNS上下文消息或新增 消息， 将维护的切出终端的对端信息传送到新 SGSN;
所述 SGSN的切入控制模块是设置成在收到前 SGSN发送的针对切入终 端的转发重定位请求后选择 GGSN;
所述 SGSN的切入控制模块还设置成： 在收到前 SGSN传送的切入终端 的对端信息后， 调用 RID更新模块为切入终端发起到对端的 RID更新。
32、 如权利要求 27所述的 WCDMA核心网， 其中，
所述 GGSN还包括对端信息维护模块， 该对端信息维护模块设置成维护 终端的对端信息， 该对端信息包含该终端的 AID与该终端的通信对端的 AID 的对应关系信息；
所述 GGSN的切出控制模块还设置成在切换过程中， 将维护的切出终端 的对端信息传送到新 GGSN;
所述 GGSN的切入控制模块还设置成： 在切换过程中， 接收前 GGSN传 送的切入终端的对端信息， 通知本 GGSN的对端信息维护模块对接收的对端 信息进行保存和维护；
所述 GGSN还包括 RID更新模块，该 RID更新模块设置成根据维护的切 入终端或切出终端的对端信息中通信对端的 AID查找到该通信对端的 RID, 向所述通信对端接入的网关发送 RID更新通知， 携带该切入终端或切出终端 的 AID和新的 RID。
33、 如权利要求 32所述的 WCDMA核心网， 其中，
所述 GGSN的切入控制模块还设置成：在 RID分配模块为切入终端分配 新的 RID后， 通过新 SGSN、 前 SGSN向前 GGSN发送信息请求； 以及， 在 收到传送来的切入终端的对端信息后， 调用 RID更新模块为切入终端发起到 对端的 RID更新；
所述 GGSN的切出控制模块还设置成：在收到前 GGSN发送的信息请求 后，将维护的切出终端的对端信息和 /或该切出终端的通信对端的 AID-RID映 射信息经前 SGSN、 新 SGSN传送到新 GGSN。
34、 如权利要求 32所述的 WCDMA核心网， 其中，
所述 GGSN的切入控制模块还设置成将为切入终端分配的新的 RID传送 给前 GGSN;
所述 GGSN的切出控制模块还设置成：在收到新 GGSN传送的切出终端 的新的 RID后，调用 RID更新模块为切出终端发起到对端的 RID更新，在更 新完成后， 将维护的该切出终端的对端信息和 /或该切出终端的通信对端的 AID-RID映射信息传送到新 GGSN。
35、 如权利要求 27所述的 WCDMA核心网， 其中，
所述 GGSN的切出控制模块还设置成：与新 GGSN建立转发通道，以及， 在建立该转发通道时或在该转发通道建立后， 将切出终端的对端信息和 /或该 切出终端的通信对端的 AID-RID映射信息传送到新 GGSN;
所述 GGSN的切入控制模块还设置成在收到前 GGSN传送的切入终端的 对端信息后， 调用 RID更新模块为切入终端发起到对端的 RID更新。
36、 如权利要求 27或 28所述的 WCDMA核心网， 其中，
所述 GGSN的切出控制模块还设置成： 在切换过程中， 将维护的切出终 端的通信对端的 AID-RID映射信息传送到新 GGSN;
所述 GGSN还包括映射信息维护模块， 所述映射信息维护模块设置成： 在切换过程中， 收到切入终端的数据 文后， 在本地维护该切入终端的通信 对端的 AID-RID映射信息，并将收到的前 GGSN传送的该切入终端的通信对 端的 AID-RID映射信息和本地维护的 AID-RID映射信息合并；
所述 GGSN的切入控制模块还设置成： 在切换过程中， 接收前 GGSN传 送的切入终端的通信对端的 AID-RID映射信息， 并通知本 SGSN的映射信息 维护模块对收到的映射信息进行保存和维护。
37、 如权利要求 27或 28所述的 WCDMA核心网， 其中，
所述 GGSN的报文转发模块是设置成通过如下方式转发数据报文： 将收 到的发给切出终端的数据报文转发给前 SGSN, 将收到的发给切入终端的数 据报文转发给新 SGSN; 或者 所述 GGSN还包括转发通道建立模块， 所述转发通道建立模块设置成： 在切换过程中为切入终端建立本 GGSN和前 GGSN之间的转发通道，或为切 出终端建立本 GGSN和新 GGSN之间的转发通道；
所述 GGSN的报文转发模块设置成通过如下方式转发数据报文： 在收到 发给切出终端的数据报文后， 经所建立的转发通道发给前 GGSN, 及收到发 给切入终端的数据报文后， 经所建立的转发通道转发给新 SGSN;
所述 SGSN的报文转发模块设置成通过如下方式转发数据报文： 将收到 的发给切出终端的数据报文转发到源无线侧网元， 将收到的发给切入终端的 数据报文转发到目标无线侧网元。
38、 如权利要求 27或 28所述的 WCDMA核心网， 其中，
所述 SGSN的切入控制模块是设置成在收到前 SGSN发送的针对切入终 端的转发重定位请求后选择 GGSN; 所述 SGSN的切入控制模块还设置成： 通过转发重定位响应将新 GGSN的地址信息传送到前 SGSN; 所述 SGSN的 切出控制模块还设置成将收到的新 GGSN的地址信息传送给前 GGSN;
所述 GGSN还包括转发通道建立模块， 该转发通道建立模块设置成： 收 到前 SGSN传送的新 GGSN的地址信息后， 与该新 GGSN交互， 建立与新 GGSN间切出终端的转发通道； 或者
所述 SGSN的切入控制模块是设置成在收到前 SGSN发送的针对切入终 端的转发重定位请求后选择 GGSN; 所述 SGSN的切出控制模块还设置成： 在向新 SGSN发送转发重定位请求时， 将前 GGSN 的地址信息传送给新 SGSN; 所述 SGSN的切入控制模块还设置成在与新 GGSN建立终端的 PDP 承载时将收到的前 GGSN的地址信息传送给新 GGSN;
所述 GGSN还包括转发通道建立模块， 该转发通道建立模块设置成在收 到前 GGSN的地址信息后，与前 GGSN交互，建立与前 GGSN间切入终端的 转发通道。
39、 如权利要求 27所述的 WCDMA核心网， 其中，
所述 SGSN的切出控制模块还设置成在向新 SGSN发送转发重定位完成 证实消息或转发重定位请求时， 将前 GGSN的地址信息传送给新 SGSN; 所 述 SGSN的切入控制模块还设置成在与新 GGSN建立切入终端的 PDP承载时 将收到的前 GGSN的地址信息传送给新 GGSN;
所述 GGSN还包括转发通道建立模块； 所述 GGSN的切入控制模块还设 置成在收到前 GGSN的地址信息后，调用所述转发通道建立模块；所述 GGSN 的转发通道建立模块设置成与前 GGSN之间交互建立切入终端的转发通道。
40、 如权利要求 33或 34所述的 WCDMA核心网， 其中，
所述 GGSN的对端信息维护模块还设置成：在保存前 GGSN传送来的切 入终端的对端信息后， 检查前 GGSN转发来的发给该切入终端的数据报文中 通信对端的 AID , 如发现新的通信对端或 RID更新未成功的通信对端， 将所 述新的通信对端或 RID更新未成功的通信对端的 AID登记到该切入终端的对 端信息中， 并向本 GGSN的切入控制模块发更新通知， 携带所述新的通信对 端或 RID更新未成功的通信对端的 AID;
所述 GGSN的切入控制模块还设置成收到对端信息维护模块发送的更新 通知后，调用 RID更新模块向所述新的通信对端或 RID更新未成功的通信对 端接入的网关发送或重发 RID更新通知。
41、 如权利要求 27所述的 WCDMA核心网， 其中，
所述涉及 SGSN间 SRNS重定位的终端切换过程是指 PS域的联合硬切换 和终端跨 SGSN的重定位过程， 或者是指联合的小区/ URA和服务 RNS重定 位的过程。
42、 如权利要求 32所述的 WCDMA核心网， 其中，
所述 GGSN的 RID更新模块是设置成通过如下方式查找到通信对端接入 的网关的地址信息： 根据该终端通信对端的 AID从本地配置或通信对端的归 属用户签约服务器或 DNS服务器或 ILR查询到该通信对端接入的网关的地址 信息。
43、 如权利要求 27所述的 WCDMA核心网， 其中，
所述 SGSN的切入控制模块还设置成根据终端的位置信息和 /或网络配置 信息来判断是否选择新 GGSN, 如本 SGSN作为新 SGSN和前 SGSN在物理 连接上连接着不同的 GGSN,则判断选择新 GGSN;如果本 SGSN作为新 SGSN 和前 SGSN连接着相同的多个 GGSN, 则根据终端所在位置区域和 /或 APN 来判断是否选择新 GGSN。
44、 如权利要求 29或 32所述的 WCDMA核心网， 其中，
所述 SGSN或 GGSN的对端信息维护模块是设置成通过如下方式维护对 端信息： 通过流实时检测机制和 /或通过检查终端的数据报文中的 AID, 将发 现的新的通信对端的 AID登记到该终端的对端信息中， 将需删除的通信对端 的 AID从该终端的对端信息中删除。
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