CN1949923A - Idle mode movement performace managing method and wireless communication system in wireless communication system - Google Patents

Abstract

The invention discloses a mobility management method in an idle mode in a wireless communication system and a wireless communication system. The wireless communication system is a two-layer node structure, and is provided with an edge wireless station (ERS) and an IP access gateway (IAGW), and the management method includes the following steps: A. A user terminal (UE) camps on the ERS The proxy IAGW (PIAGW) of the agent sends a location update request message to trigger the location update process; B, PIAGW sends a location update message to the Home Subscriber Server (HSS), requesting to update the UE location; C, the HSS updates the location identifier of the UE; D . The PIAGW sends the location identifier of the UE to the UE. In the present invention, a new mobility management method in idle mode is proposed, and the original process is improved to adapt to the new characteristics of the merger of SGSN and GGSN in the future network.

Description

Mobility management method in idle mode in wireless communication system and wireless communication system

technical field

The present invention relates to the communication field, in particular to a mobility management method in an idle mode in a wireless communication system and a wireless communication system.

Background technique

Universal Mobile Telecommunications System (UMTS) is a third-generation mobile communication system that adopts Wideband Code Division Multiple Access (WCDMA) air interface technology. The UMTS system is usually called WCDMA communication. system. The UMTS system adopts a structure similar to that of the second-generation mobile communication system, including a radio access network (Radio Access Network, RAN) and a core network (Core Network, CN). Among them, the wireless access network is used to handle all wireless-related functions, while the CN handles all voice calls and data connections in the UMTS system, and realizes switching and routing functions with external networks. CN is logically divided into Circuit Switched Domain (CS) and Packet Switched Domain (PS). The Territorial Radio Access Network (UMTS Territorial Radio Access Network UMTS, UTRAN), CN and User Equipment (User Equipment, UE) together constitute the entire UMTS system, and its system structure is shown in Figure 1.

UTRAN includes one or several radio network subsystems (Radio Network Subsystem, RNS). An RNS consists of a radio network controller (Radio Network Controller, RNC) and one or more base stations (NodeB). The interface between the RNC and the CN is the Iu interface, and the NodeB and the RNC are connected through the Iub interface. In UTRAN, RNCs are interconnected through Iur, and Iur can be connected through direct physical connection between RNCs or through a transmission network. The RNC is used to allocate and control the wireless resources of the NodeB connected or related to it. The NodeB completes the conversion of the data flow between the Iub interface and the Uu interface, and also participates in a part of radio resource management. The structure of UTRAN is shown in Figure 2:

NodeB is the base station (that is, the wireless transceiver) of the WCDMA system, including the wireless transceiver and baseband processing components. Through the standard Iub interface and RNC interconnection, it mainly completes the processing of the Uu interface physical layer protocol. Its main functions are spread spectrum, modulation, channel coding and despreading, demodulation, channel decoding, and also include functions such as mutual conversion of baseband signals and radio frequency signals.

The RNC is used to control the radio resources of the UTRAN, and mainly completes functions such as connection establishment and disconnection, handover, macro-diversity combination, and radio resource management and control. details as follows:

(1) Perform system information broadcast and system access control functions;

(2) Mobility management functions such as handover and RNC relocation (Relocation, or relocation);

(3) Radio resource management and control functions such as macro-diversity combining, power control, and radio bearer allocation.

As shown in Figure 3, it is a schematic structural diagram of the 3G PS domain core network, wherein the SGSN is a basic component network element of the PS network. Its main function is to forward input/output IP packets for the UEs in the service area of the SGSN, and its status is similar to that of the VMSC in the CS domain. SGSN provides the following functions:

The routing and forwarding function of packet data packets in this SGSN area provides services for all PS users in this SGSN area;

Encryption and authentication functions;

session management functions;

Mobility management functions;

Interface functions with UTRAN, GGSN, HLR, MSC, SMS-GMSC, SMS-IWMSC, etc.;

Bill generation and output function, mainly to collect the user's use of wireless resources;

In addition, the SGSN also integrates functions similar to the VLR in the CS network. When the user is in the Attached (attached) state, the SGSN stores the user information and location information related to the group. Similar to VLR, most of the user information in SGSN is obtained from HLR during location update.

The GGSN is also a network element functional entity introduced to provide PS service functions in the UMTS network, and provides routing and encapsulation of data packets between the PS network and the external data network. Which GGSN the user chooses as the gateway is determined according to the subscription information of the user and the access point name (APN) requested by the user during the PDP context activation process. GGSN mainly provides the following functions:

With the interface function of the external IP packet network, the GGSN needs to provide the gateway function for the UE to access the external packet network. From the perspective of the external network, the GGSN is like a router that can address all user IPs in the PS network. Network exchange routing information;

Session management, completing the communication establishment process between the UE and the external network;

The function of sending the packet data of the mobile user to the correct SGSN;

The function of generation and output of bills mainly reflects the user's use of the external network;

In the current UMTS network, when the UE is in an idle state, the CN manages the mobility of the UE by way of location update. Whenever the UE roams from one location area to another location area, the UE initiates a location update process, requesting the SGSN to change its stored UE location area information. And SGSN carries out position registration to HLR, updates the user's position information preserved in HLR, comprises new SGSN mark, new SGSN address. When the GGSN receives downlink data from the external data network, the GGSN first queries the HLR to obtain the SGSN-level location information of the UE, and sends a notification message to the SGSN where the UE is located, informing the SGSN to page the UE. However, the SGSN needs to query the local VLR to obtain the location area information of the UE before paging.

Considering the competitiveness of the future network, 3GPP is currently considering how the network will evolve in the future. There are many evolution schemes discussed in 3GPP. The purpose of network evolution is to provide a low latency, high data rate, and high system capacity. and coverage, low-cost, fully IP-based networks.

There are many candidate schemes for network evolution, among which the two-layer node architecture is more popular, as shown in Figure 4.

Under this architecture, ERS (Edge Radio Station) is an evolved Node B, which has most of the previous RNC functions and adopts new physical layer technologies (such as OFDM), and IAGW (IP AccessGateWay) has some SGSN functions and previous GGSN features. The HSS user server is used to store the location information of the user, such as SERS or the identifier of the RA area where the UE is located or the identifier of the SGSN where the UE is located. Due to the merger of the original SGSN and GGSN in the original UMTS network, the original mobility management solution is no longer applicable.

Contents of the invention

The invention provides a mobility management method in an idle mode in a wireless communication system and a wireless communication system, which are used to solve the problem of mobility management in a UE idle mode under a two-layer node architecture.

A method for managing idle mode mobility in a wireless communication system, wherein the wireless communication system is a two-layer node structure, and is provided with an edge wireless station (ERS) and an agent IP access gateway (PIAGW), and the method comprises the following steps:

A. The user terminal (UE) sends a location update request message to the proxy IAGW (PIAGW) where the ERS resides, triggering the location update process;

B. PIAGW sends a location update message to the Home Subscriber Server (HSS), requesting to update the UE location;

C. The HSS updates the location identifier of the UE;

D. The PIAGW sends the location identifier of the UE to the UE.

The location update is a routing area (RA) update. In the step B, the location update request message is a routing area update request message. In step C, the location identification is an RA area identification.

The step A is triggered when the UE detects that the routing area identifier (RA ID) issued by the broadcast channel does not match its own RAID value.

The UE roams within the same PIAGW of the home public land mobile network (PLMN).

The step B further includes the step of PIAGW judging whether to initiate an authentication encryption operation on the UE.

The PIAGW judges whether to initiate an authentication and encryption process for the UE. After the PIAGW receives the routing update request message, it compares the authentication response value ERS in the message with the locally stored first ERS, and if inconsistent Then perform the authentication and encryption operation.

The UE roams within different PIAGW ranges of the home PLMN, or roams from the visited PLMN network to the home PLMN network, or roams from the home PLMN network to the visited PLMN network.

In the described step A, in the described routing area update request message, include original RAID ID, original P-TMSI signature, update type, the identifier of the belonging PLMN of UE, authentication response value information.

Described step B further comprises:

B1, the new PIAGW sends a context request message to the original PIAGW, and the message includes the original RAID, the temporary logical link identifier (TLLI), the original P-TMSI signature, and the new PIAGW address;

B2. The new PIAGW sends an update location message to the Home Subscriber Server (HSS) to update the location information stored in the HSS.

10. The method according to claim 9, characterized in that the step B1 further comprises the step of determining whether the P-TMSI can be identified by the TPIAGW after receiving the routing area update request message.

If the TPIAGW cannot recognize the P-TMSI, and the RAI described in the message is not its own, it will derive the address of the SPIAGW according to the old P-TMSI and RAI number.

Described step C further comprises:

C1, the HSS sends a Cancel Location (Cancel Location) message to the original PIAGW, and the message includes the user's IMSI and the type of deletion;

C2. The original PIAGW deletes the corresponding UE context;

C3, HSS updates the RA ID value of UE, and sends insert user data message to new PIAGW, informs new PIAGW to insert user data;

C4. The new PIAGW creates a corresponding UE context, and returns an insertion user data confirmation message;

C5. When the HSS receives the message, it sends a location update response message to the PIAGW.

Said step C2 also includes deleting the authentication and encryption information when the UE is initially turned on.

In the method, if the UE roams from the visited network and returns to the PLMN network, it also includes deleting the original RAI identifier of the UE that exists locally in the original PIAGW.

In the step C3, the inserting user data message includes the user's IMSI and the user's subscription information.

In the step C3, if the UE roams within the home PLMN or returns to the home PLMN from the visited PLMN, the location information updated by the HSS is the RA ID value of the UE; if the UE roams from the home PLMN to the visited PLMN, the updated location information in the HSS is the PIAGW logo.

In the step D, the location information includes: packet temporary mobile subscriber identification number (P-TMSI) and P-TMSI signature.

In said step D, it also includes sending the new RAID ID to the UE.

The described method also includes the steps of:

E. The UE stores the received new P-TMSI, the new P-TMSI signature, and the new RAID ID, and returns a routing update completion message.

The wireless communication system of the present invention includes an IP access gateway (IAGW) connected through an IP network, an edge radio station (ERS) providing access for UEs, and a home subscriber server (HSS) storing user information, wherein: The above-mentioned IAGW includes a proxy IAGW (PIAGW), and the PIAGW is used for user mobile security management.

The present invention proposes a new idle mode mobility management method, which improves the original mobility management flow to adapt to the new characteristics of the merger of SGSN and GGSN in the future network.

Description of drawings

FIG. 1 is a schematic structural diagram of a UMTS system in the prior art;

FIG. 2 is a schematic diagram of a UTRAN network structure in the prior art;

FIG. 3 is a schematic diagram of a PS domain network structure in the prior art;

FIG. 4 is a schematic diagram of a network structure of an evolution architecture of a two-layer node in the prior art;

FIG. 5 is a schematic diagram of a network structure of an evolution architecture of a two-layer node according to the present invention;

6 is a schematic flow diagram of Embodiment 1 of the present invention;

Fig. 7 is a schematic flow chart of Embodiment 2 of the present invention;

Fig. 8 is a schematic flow chart of Embodiment 3 of the present invention.

Detailed ways

The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

In the two-layer node architecture, because the number of nodes passed through in the data transmission process has a great impact on the transmission delay, the SGSN and GGSN network elements in the original UMTS system are merged into the access gateway IAGW. When the UE roams in the home PLMN network, the UE receives or sends data, and directly communicates with the IAGW selected according to the APN of the service through its resident ERS. For the UE roaming in the visited PLMN, in addition to the fixed IP service belonging to the specific home IAGW, its common service can also choose the corresponding IAGW in the visited PLMN network to communicate directly according to the APN corresponding to the service.

On this basis, the solution of the present invention, as shown in FIG. 5, divides the functions of the IAGW into a proxy IAGW (PIAGW) responsible for UE mobile security management. Under this division, it can be convenient and flexible Provide refined services for UE.

In the improved location update process, when the UE roams in its home PLMN, the UE directly initiates an RA update to the HSS through the PIAGW of its ERS; when the UE roams to other PLMNs, the UE resident ERS The PIAGW directly initiates the update of the RA area, and the PIAGW initiates the location update of the SGSN level to the HSS.

The present invention proposes a solution for idle mode mobility management of a UE in a wireless communication system with a two-layer node structure, which is specifically described in the following embodiments.

Example 1:

In Embodiment 1, the UE roams within the range of the same PIAGW in its home PLMN. When the UE roams to a new RA area under the PIAGW, the UE obtains the identity of the new RA area by listening to the broadcast channel and compares it with the RA area identity stored by itself, knowing that it has roamed to a new RA area. Then the UE initiates an RA update process, and notifies the CN to change the identification value of the UE's RA area stored in the HSS. When there is a downlink service, the IAGW queries the HSS to get or the identity of the new RA area and sends a paging message to the UE. As shown in Figure 6, the following steps are included:

S11. The UE detects that the RA ID issued by the broadcast channel does not match its own RA ID value, initiates the RA update process, and sends a Routing Area Update Request message to the PIAGW where it resides in the ERS, which contains the identification of the UE's home PLMN, Authentication response value ERS and other information. The message is first sent to the ERS. After receiving the message, the ERS will add the cell global identity including the RAC to the message and send it to the PIAGW.

S12. When the PIAGW receives the Routing Area Update Request message, it will compare the authentication response value ERS in the message with the locally stored ERS. If inconsistent, the authentication and encryption process is performed, and the authentication and encryption procedure is triggered by sending an authentication and encryption request to the UE.

In this solution, the PIAGW can be set to reserve the authentication information of the authentication and encryption process for the UE when it is powered on, so this step can generally be omitted.

After the authentication and encryption process is completed, the PIAGW determines that the UE is in its home PLMN network according to the home PLMN identifier of the UE in the location update message, and then the PIAGW sends an update location message to the HSS to update the location information stored in the HSS. For the UE roaming in the home network, the location information is the identifier of its RA area.

S13.HSS receives the Update Location message, and updates the RA ID value of the UE. And send an Update Location Ack message to PIAGW to confirm that the location update is completed.

S14. After receiving the location update confirmation message, the PIAGW allocates a new P-TMSI and a new P-TMSI signature for the UE, and includes these information together with the RAI in the routing area update acceptance message and sends it to the UE.

S15. When the UE receives the location update acceptance message, it knows that the location update procedure initiated by it is successfully completed. Store the received new P-TMSI, new P-TMSI signature, and new RAI identifier, and return a routing update completion message at the same time, and the entire location update process is completed.

In Embodiment 1, since the UE roams under the same PIAGW, the UE context transfer process between IAGWs is not involved.

Example 2:

In Embodiment 2, the UE roams between different PIAGW ranges in its home PLMN or roams from the visited PLMN network to the home PLMN network. When the UE roams to a new RA area in the home network, the UE obtains the identity of the new RA area by listening to the broadcast channel and compares it with the RA area identity stored in itself to know that it has roamed to a new RA area. Then the UE initiates an RA update process, and notifies the CN to change the identification value of the UE's RA area stored in the HSS. When there is a downlink service, the IAGW queries the HSS to obtain the identity of the new RA area and sends a paging message to the UE. In this process, since the UE roams between two PIAGWs, the UE context transfer process between two different IAGWs is involved. The context includes information such as authentication and encryption performed when the UE is powered on stored in the source PIAGW. As shown in Figure 7, the following steps are included:

S21. The UE detects that the RA ID issued by the broadcast channel does not match its own RA ID value, initiates the RA update process, and sends a Routing Area Update Request message to the PIAGW where it resides in the ERS, which contains the identification of the UE's home PLMN, The original RAI, the original P-TMSI signature, the update type, the identity of the UE's home PLMN, the authentication response value ERS and other information. The message is first sent to the ERS. After receiving the message, the ERS will add the cell global identity including the RAC to the message and send it to the PIAGW.

S22. When TPIAGW receives the Routing Area Update Request message, if it finds that it cannot recognize the P-TMSI, and the RAI described in the message is not its own, it will derive the address of SPIAGW according to the old P-TMSI and RAI number, and send it to SPIAGW Issue a context request message. The message contains the original RAI, TLLI, original P-TMSI signature, and TPIAGW address to obtain the corresponding context of the UE, which includes authentication and encryption information when the UE is initially powered on.

S23. After receiving the context request message sent by the TPIAGW, the SPIAGW will return a context response message, which includes UE context such as authentication and encryption information when the UE is initially powered on.

S24. When the TPIAGW receives the context response message returned by the SPIAGW, it compares the authentication response value ERS in the message with the ERS reported by the UE. If inconsistent, the authentication and encryption procedure is performed, and the authentication and encryption procedure is triggered by sending an authentication and encryption request to the UE.

In this solution, since the SPIAGW retains the authentication information of the authentication and encryption process performed by the UE when it is turned on, this step can generally be omitted.

After the authentication and encryption process is completed, the TPIAGW judges that the UE is in its home PLMN network according to the home PLMN identifier of the UE in the location update message, and then the TPIAGW sends an update location message to the HSS to update the location information stored in the HSS. For the UE roaming in the home network, the location information is the identifier of its RA area. TPIAGW can also choose to obtain authentication parameters from SPIAGW or HSS, and directly perform the authentication and encryption process to prevent security risks caused by frequent transmission of authentication and encryption information.

S25. The HSS receives the Update Location message and sends a Cancel Location message to the SPIAGW, which contains the user's IMSI and deletion type.

S26. After receiving the message, the SPIAGW will delete the corresponding UE context, including authentication and encryption information when the UE is initially turned on. If the UE roams from the visited network and returns to the PLMN network, it shall also include the original RAI identifier of the UE that exists locally in the SPIAGW. After deleting the context, SPIAGW returns a location deletion confirmation message.

S27. The HSS updates the RA identifier value of the UE, and notifies the FPI AGW to insert user data by sending an insert user data message to the TPI AGW. The message includes the user's IMSI and the user's subscription information.

S28. After receiving the insert user information message sent by the HSS, the TPIAGW will create a corresponding UE context, and then return an insert user data confirmation message.

S29. When the HSS receives the message, it sends an Update Location Ack message to the TPIAGW to confirm that the location update is completed.

S210. After receiving the location update confirmation message, the TPIAGW allocates a new P-TMSI and a new P-TMSI signature for the UE, and includes these information together with the RAI in the routing area update acceptance message and sends it to the UE.

S211. When the UE receives the location update acceptance message, it knows that the location update procedure initiated by it is successfully completed. Store the received new P-TMSI, new P-TMSI signature, and new RAI identifier, and return a routing update completion message at the same time, and the entire location update process is completed.

Example 3:

In Embodiment 3, the UE is roaming from its home PLMN to the visited PLMN network. When the UE roams from its home PLMN to an RA area of the visited PLMN network, the UE obtains the ID of the new RA area by listening to the broadcast channel and compares it with the ID of the stored RA area to know that it has roamed to a new RA area. Then the UE initiates an RA update process, and notifies the CN to change the UE location information stored therein. Because the distance between the ERS in the visited network and the IAGW in the home network is often very far away, the cost of direct communication is high. Therefore, when the UE roams, the PIAGW of the visited network often communicates indirectly with the IAGW of the home network. In the case of UE roaming, the CN performs mobility management on the UE by storing the RA area identifier of the UE in the PIAGW, and storing the PIAGW address of the UE in the HSS. When there is a downlink service, the IAGW queries the HSS to obtain the address information of the PIAGW where the UE is located. And notify the proxy PIAGW that there is downlink data for the UE, and the PIAGW sends a paging message to the UE according to the identifier of the RA area stored in it. In this process, since the UE roams between two PIAGWs, the UE context transfer process between two different IAGWs is involved. The context includes information such as authentication and encryption performed when the UE is powered on stored in the SPI AGW. As shown in Figure 8, the following steps are included:

S31. The UE detects that the RA ID issued by the broadcast channel does not match its own RA ID value, initiates the RA update process, and sends a Routing Area Update Request message to the PIAGW where it resides in the ERS, which contains the identifier of the UE's home PLMN, The original RAI, the original P-TMSI signature, the update type, the identity of the UE's home PLMN, the authentication response value ERS and other information. The message is first sent to the ERS. After receiving the message, the ERS will add the cell global identity including the RAC to the message and send it to the TPIAGW.

S32. When TPIAGW receives the Routing Area Update Request message, if it finds that the P-TMSI cannot be recognized, and the RAI described in the message is not its own, it will derive the address of SPIAGW according to the old P-TMSI and RAI number, and send it to SPIAGW Issue a context request message. The original RAI, TLLI, original P-TMSI signature, and TPIAGW address are included in the message to obtain the corresponding context of the UE. This context includes authentication and encryption information when the UE is initially powered on.

S33. After receiving the context request message from the TPIAGW, the SPIAGW will return a context response message, which includes UE context such as authentication and encryption information when the UE is initially powered on.

S34. When the TPIAGW receives the context response message returned by the original PIAGW, it compares the authentication response value ERS in the message with the ERS reported by the UE. If inconsistent, the authentication and encryption procedure is performed, and the authentication and encryption procedure is triggered by sending an authentication and encryption request to the UE.

In this solution, since the SPIAGW retains the authentication information of the authentication and encryption process performed by the UE when it is turned on, this step can generally be omitted.

After the authentication and encryption process is completed, the TPIAGW judges that the UE is roaming in the local PLMN network according to the home PLMN identifier of the UE in the location update message, then the PIAGW locally saves the RA area identifier of the UE, and sends an update location message to the HSS to update Location information saved in HSS. For a UE roaming in the visited network, the location information is the identifier of the TPI AGW where it is located. TPIAGW can also choose to obtain authentication parameters from SPIAGW or HSS, and directly perform the authentication and encryption process to prevent security risks caused by frequent transmission of authentication and encryption information.

S35. The HSS receives the Update Location message and sends a Cancel Location message to the SPIAGW, which contains the user's IMSI and deletion type.

S36. After receiving the message, the SIAGW will delete the corresponding UE context, including authentication and encryption information when the UE is initially turned on, and then return a location deletion confirmation message.

S37. The HSS updates the location information of the UE to the identifier of the TPI AGW, and notifies the TPI AGW to insert user data by sending an insert user data message to the TPI AGW. The message includes the user's IMSI and the user's subscription information.

S38. After receiving the insert user information message sent by the HSS, the TPIAGW will create a corresponding UE context, and then return an insert user data confirmation message.

S39. When the HSS receives the message, it sends an Update Location Ack message to the TPIAGW to confirm that the location update is completed.

S310. After receiving the location update confirmation message, the TPIAGW allocates a new P-TMSI and a new P-TMSI signature for the UE, and includes these information together with the RAI in the routing area update acceptance message and sends it to the UE.

S311. When the UE receives the location update acceptance message, it knows that the location update process initiated by it is successfully completed. Store the received new P-TMSI, new P-TMSI signature, and new RAI identifier, and return a routing update completion message at the same time, and the entire location update process is completed.

Thereafter, the UE roams in the visited PLMN network. Because the distance between the ERS in the visited network and the IAGW in the home network is often very far away, the cost of direct communication is high. Therefore, when the UE roams, the PIAGW of the visited network often communicates indirectly with the IAGW of the home network. In the case of UE roaming, the CN performs mobility management on the UE by storing the RA area identifier of the UE in the PIAGW, and storing the PIAGW address of the UE in the HSS. When there is a downlink service, the IAGW queries the HSS to obtain the address information of the PIAGW where the UE is located. And notify the proxy PIAGW that there is downlink data for the UE, and the PIAGW sends a paging message to the UE according to the identifier of the RA area stored in it. This mobility management method is similar to that in the existing UMTS network. The only difference is that when the UE roams between different PIAGWs, the context forwarded by the original PIAGW to the new PIAGW includes the authentication and encryption information when the UE is initially powered on. The new PIAGW can rely on this information to speed up its authentication process.

In the mobility management process of the above-mentioned several embodiments, the key value CK stored in the original PIAGW and the UE can also be used to encrypt the message transmitted between the UE and the ERS, so as to increase the reliability of message transmission.

In the new evolution architecture, due to the merger of SGSN and GGSN, the original two-layer node mobility management mode is no longer applicable. The present invention proposes a new mobility management method in idle mode, which improves the original process to adapt to the new characteristics of the merger of SGSN and GGSN in the future network.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (20)

1. A mobility management method in idle mode in a wireless communication system, wherein the wireless communication system is a two-layer node structure, and is provided with an edge wireless station (ERS) and a proxy IP access gateway (PIAGW), wherein the Said method comprises the following steps: A. The user terminal (UE) sends a location update request message to the proxy IAGW (PIAGW) where the ERS resides, triggering the location update process; B. PIAGW sends a location update message to the Home Subscriber Server (HSS), requesting to update the UE location; C. The HSS updates the location identifier of the UE; D. The PIAGW sends the location identifier of the UE to the UE. 2. The method according to claim 1, wherein said location update is a routing area (RA) update, and in said step B, said location update request message is a routing area update request message, In step C, the location identifier is an RA area identifier. 3. The method according to claim 2, wherein the step A is triggered when the UE detects that the routing area identifier (RAID) issued by the broadcast channel does not match its own RAID value. 4. The method according to claim 2 or 3, wherein the UE roams within the same PIAGW range of the public land mobile network (PLMN) it belongs to. 5. The method according to claim 4, characterized in that, in the step B, the PIAGW further comprises the step of judging whether to initiate an authentication and encryption operation to the UE. 6. The method according to claim 5, wherein the PIAGW determines whether to initiate an authentication and encryption process for the UE, after the PIAGW receives the routing update request message, it The response value ERS is compared with the locally stored first ERS, and if they are inconsistent, an authentication and encryption operation is performed. 7. The method according to claim 2 or 3, wherein the UE roams within different PIAGW ranges of the home PLMN, or roams from the visited PLMN network to the home PLMN network, or roams from the home PLMN to the visited PLMN network. 8. The method according to claim 7, wherein in the step A, the routing area update request message includes the original RA ID, the original P-TMSI signature, the update type, and the home PLMN of the UE The identification and authentication response value information. 9. The method according to claim 7, characterized in that said step B further comprises: B1, the new PIAGW sends a context request message to the original PIAGW, and the message includes the original RAID, the temporary logical link identifier (TLLI), the original P-TMSI signature, and the new PIAGW address; B2. The new PIAGW sends an update location message to the Home Subscriber Server (HSS) to update the location information stored in the HSS. 10. The method according to claim 9, characterized in that the step B1 further comprises the step of determining whether the P-TMSI can be identified by the TPIAGW after receiving the routing area update request message. 11. The method according to claim 10, wherein if the TPIAGW cannot recognize the P-TMSI, and the RAI described in the message is not its own, it will derive the SPIAGW's P-TMSI according to the old P-TMSI and RAI number address. 12. The method according to claim 9, characterized in that said step C further comprises: C1, the HSS sends a Cancel Location (Cancel Location) message to the original PIAGW, and the message includes the user's IMSI and the type of deletion; C2. The original PIAGW deletes the corresponding UE context; C3, HSS updates the RA ID value of UE, and sends insert user data message to new PIAGW, informs new PIAGW to insert user data; C4. The new PIAGW creates a corresponding UE context, and returns an insertion user data confirmation message; C5. When the HSS receives the message, it sends a location update response message to the PIAGW. 13. The method according to claim 12, further comprising deleting the authentication and encryption information when the UE is initially turned on in the step C2. 14. The method according to claim 13, wherein if the UE roams from the visited network and returns to the PLMN network, further comprising deleting the original RAI identifier of the UE that exists in the original PIAGW. 15. The method according to claim 12, wherein in the step C3, the inserting user data message includes the user's IMSI and the user's subscription information. 16. The method according to claim 12, wherein in step C3, if the UE is roaming within the home PLMN or returns to the home PLMN from the visited PLMN, the location information updated by the HSS is the UE’s RA ID value ; If the UE roams from the home PLMN to the visited PLMN, the PIAGW identity is updated in the HSS. 17. The method according to claim 2 or 3, wherein in the step D, the location information includes: packet temporary mobile subscriber identification number (P-TMSI) and P-TMSI signature. 18. The method according to claim 17, wherein said step D further comprises sending the new RAID ID to the UE. 19. The method of claim 18, further comprising the step of: E. The UE stores the received new P-TMSI, the new P-TMSI signature, and the new RAID ID, and returns a routing update completion message. 20. A wireless communication system, comprising an IP access gateway (IAGW) connected through an IP network, an edge radio station (ERS) providing access to a UE, and a home subscriber server (HSS) storing user information, characterized in that , the IAGW includes a proxy IAGW (PIAGW), and the PIAGW is used for user mobile security management.

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