WO2007028314A1

WO2007028314A1 - Method and device for updating access number of user equipment

Info

Publication number: WO2007028314A1
Application number: PCT/CN2006/002124
Authority: WO
Inventors: Dongming Zhu; Hai Zhang; Xiaoqin Duan
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2005-09-09
Filing date: 2006-08-21
Publication date: 2007-03-15
Also published as: CN1929678A; CN1929678B

Abstract

A method and device for updating access number of user equipment sets a reallocation logic module for implementing reallocation of UE access number, and presets corresponding relation between UE location information and UE access number therein. After obtaining the UE location information, the reallocation logic module reallocates UE access number according to the current location information and synchronizes the allocated UE access number to call executing point UE or gsmSCF and UE. The method of the present invention can realize reallocation of UE access number and update of UE current access number according to UE location information in time, ensure that VMSC can recognize UE access number, make UE complete call handover successfully at CS call when handing over call from IMS domain to CS domain, increase the satisfaction of user and enhance the reliability of network. Further, the present invention provides a method of dynamic UE access number for UE, makes CS domain complete the call handover from IMS domain to CS domain without obtaining routing information by CAMEL interaction, and therefore improves the efficiency of handover.

Description

Method and device for updating user terminal access code

The present invention relates to a cross-domain calling technology, and more particularly to a method and apparatus for updating a user terminal access code when a user terminal (UE) is in a roaming state. Background of the invention

Beginning with 3rd Generation Partner Version 5 (3GPP R5), the core network of the Universal Mobile Telecommunications System (UMTS) is divided into three subsystems: Circuit Switched (CS), Packet Switched (PS), and IP Multimedia Subsystem (IMS). ). The Circuit Switched Domain (CS) is used to provide users with circuit-type service connections, including the Mobile Exchange Center (MSC), GMSC, Interoperability Function (IFF) module, and several main entities, MSC (MSC Server/CS-MGW). It is used to complete the switching and signaling control functions of the circuit-switched service; the GMSC is the MSC that completes the mobile subscriber routing and addressing function in a certain network, and can be set up or divided with the MSC; the IWF is generally closely related to the MSC, and is used to complete The interworking between the public land mobile communication network (PLMN) and the integrated services digital network (ISDN), the public switched communication network (PSTN), and the packet data network (PDN) mainly completes the signaling conversion function, and the specific functions are based on the service and network type. Different regulations.

The PS switch (Packet Switched Domain) is used to provide a connection of a packet type service to a user, including: a GPRS support node (GSN) and a border gateway (BG) entity, where the GSN is used to complete the packet service packet transmission. The GSN further includes a Serving GPRS Support Node (SGSN) and a Gateway GPRS Support Node (GGSN). The SGSN provides a connection between the core network and the BSS and the RNS in the radio access system, and completes mobility management and session management functions of the packet data service. Manage mobile (MS) mobile and communications industries within mobile networks As the interface between the mobile communication system and other public data networks, the GGSN also has the function of querying location information, and both the SGSN and the GGSN can provide charging information. BG is used to complete the interworking between the two GPRS networks to ensure the security of network interworking.

In addition, the CS domain and the PS domain also share the following functional entities: HLR/AuC, the Home Location Register (HLR) is used to manage user subscription data and location information, wherein the subscriber subscription data includes MSISDN, IMSI, PDP ADDRESS. The contracted telecommunication service and supplementary service and the scope of application of the service, etc., the location information includes MSRN, MSC/VLR number, SGSN number, GMLC, etc.; the authentication center (AuC) is used to store the user's authentication algorithm and secret. key. Visiting location register (VLR) for processing various data information of visited users; EIR for storing User Equipment Identity (IMEI) information; and Short Message Center Gateway MSC (SMS-GMSC/SMS IMSC) and the like.

IMS (IP Multimedia Subsystem) is a subsystem superimposed on the existing packet domain in the WCDMA network added in the 3GPP R5 phase. The packet domain is used as the bearer channel for the upper layer control signaling and media transmission, and the initial session protocol is introduced. As a service control protocol, SIP (SIP) provides rich multimedia services by separating the service control from the bearer control by using SIP's simple, easy-to-expand, and convenient media combination. The main functional entities in IMS include call session control function entity (CSCF) that controls functions such as user registration and session control, an application server (AS) that provides various service logic control functions, and a home user server (HSS) that centrally manages user subscription data. And a media gateway control function/IP multimedia-media gateway function (MGCF I IM-MGW) for implementing interworking with the circuit switched network. The user accesses the IMS through the current proxy CSCF (P-CSCF), and the trigger control of the session and the service and the service control interaction with the AS are performed by the service CSCF (S-CSCF) of the user home domain. Among them, the HSS in the IMS is a superset of the HLR, and is functionally compatible with the HLR, but in the specific networking, the HSS of the HSS and the CS/PS are generally divided.

The IMS architecture defined by the 3GPP standard comprehensively solves the problem of providing multimedia under IP bearer. The key operational issues such as roaming billing, .QoS, and security assurance that the service needs to solve have been recognized by the industry. 3GPP2 and TISPAN have adopted the 3GPP model as the basis and reference for the corresponding IP multimedia network architecture and services. The definition of the system, 3GPP has also begun research on WLAN access and UMTS interworking (I-WLAN), fixed broadband access IMS (FBI) and all-IP network (AIPN) for multiple access technologies. The user can access the IMS through a single multimode terminal or multiple types of terminals through an access network using different access technologies according to the subscription information of the user to obtain a unified multimedia service including the VoIP service. In the research process of accessing IMS through different access networks, the problem of business continuity (VCC, Voice Call Continuity) between CS calls and VoIP services provided by WLAN access to IMS is proposed. The problem of CS/IMS inter-domain routing when the user acts as a called party to adapt to the needs of network and service development.

Currently, in order to enable the UE to switch to the IMS domain in a CS domain call, the current handover scheme provides: when the UE is in a CS call, its control part resides in the IMS; in addition, when the UE switches from the IMS to the CS during the call In the case of the domain, the CS part of the UE needs to call the cross-domain handover number (VDN, VCC Domain Transfer Number) to call the DTF AS, thereby performing the handover from the IMS domain to the CS domain.

For the initial call situation of the CS, when the VCC UE initiates the CS establishment, it needs to be routed to the domain transfer function (DFF) of the user's home IMS domain, thereby triggering the route back-to-back user agent (B2BUA) function on the DTF, and controlling the The bearer plane of the CS call. For the implementation of the purpose, the CS part of the UE needs to send a call setup request to the visited mobile switching center (VMSC) through a Setup message, and the VMSC enhances the custom service logic (CAMEL) subscription information according to the user mobile network, triggering the Initial DP message to Gsm service control function (gsmSCF) with network domain selection function (DSF, Domain Selection Function), gsmSCF through CAMEL connect message The VMSC sends an IMS routing number (IMR) to the DTF in the IMS. The IMRN carries the DTF PSI information. The VMSC routes the call through the start address (IAM) message to the MGCF of the IMS domain according to the received DTF PSI. The MGCF The IMR carried in the IAM message sends a call to the DTF, thereby activating the initial static anchor service of the CS in the DTF. At this time, the DTF anchors the call as a static anchor, that is, the subsequent calling user does not have a CS domain to the IMS domain. The handover or handover of the IMS domain to the CS domain is performed by the static anchor to switch the anchored call.

For the case that the UE has successfully established a call in the IMS domain, the UE may switch the current call from the IMS domain to the CS domain. For example, the UE finds that the wireless signal gradually declines by determining the wireless signal measurement of the current IMS domain, and then initiates the current call from the UE. The handover process of the IMS domain switching to the CS domain is shown in FIG. 1 for the handover process of the call from the IMS domain to the CS domain. FIG. 1 is a flowchart of the IMS domain call handover to the CS domain in the prior art.

As shown in FIG. 1, step 100: When the UE initiates a call handover from the IMS domain to the CS domain, the configured VDN is carried as a called number in a setup message and sent to the VMSC.

Step 101 102: After receiving the Setup message, the VMSC triggers the CAMEL according to the subscription information, and sends the IDP message to the gsmSCF with the DSF function. The DSF function gsmSCF performs the renaming process when the called party is the VDN, and sends and dynamically carries the IMRN. Returned to the VMSC in the CONNECT message.

Step 103: The VMSC sends the received IMRN as the called number, which is carried in the start address (IAM) message and sent to the MGCF.

Steps 104 to 106: The MGCF allocates resources and performs configuration on the MGW, and sends an INVITE message to the I-CSCF. After receiving the INVITE message, the I-CSCF routes the message to the DTF, where the INVITE message carries the IMRN; the DTF completes the CS call. The leg establishes and releases the original IMS domain call leg.

From the flow chart of the call handover from the IMS domain to the CS domain shown in FIG. 1, it can be seen that When the UE initiates the handover call, the UE initiates a call setup request to the VMSC as the called number in the fixed number VDN of the UE, and the VMSC sends the VDN through the CAMEL IDP message to the gsmSCF having the DSF function, and the gsmSCF according to the special VDN number. It is determined that the current call initiated by the UE is an IMS to CS domain handover call, so the IMRN is provided to the VMSC through the CONNECT operation of the CAMEL, which is a PSI that points to the DTF that has previously anchored the call, that is, the DTF. PSI. Therefore, the VMSC routes the call to the DTF of the IMS domain according to the IMR, and the DTF triggers the B2BUA function to complete the handover operation of the call.

In the handover process, since the VDN initiated by the UE is statically configured in the terminal, then the real DTF PSI pointing to the DTF is obtained through the CAMEL interaction VMSC, so that the call is correctly routed to the DTF to complete the call handover operation, so that each In the case of a handover call, the CAMEL process needs to be triggered, which results in a large delay of the handover. In some areas, if the network cannot support the CAMEL function, the handover call initiated by the UE cannot be successfully routed, and the call handover fails.

In order to improve the switching efficiency, the VDN can be dynamically allocated to the UE, and the dynamic VDN is IMRN. In this way, the UE can directly call the IMRN when the handover is performed, and the gsmSCF does not need to trigger the change operation. The VMSC routes the session to the DTF AS of the IMS domain according to the IMR, but does not previously allocate the dynamic VDN to the UE for call handover.

At the same time, if the dynamic VDN is used as the access code, when the location of the UE changes, there is a certain difference in the number assignment of the different regions. When the UE roams and attaches to the VMSC, it must use the access number that the local VMSC can identify. The access code used for route analysis in the VMSC is pre-configured based on the local number and route plan, and cannot be dynamically adjusted in real time. However, the existing solution for resolving the UE in the IMS to CS domain handover does not exist. The mechanism for updating the UE access code in time according to the location of the UE, so that the access code in the UE is inconsistent with the access code in the VMSC, and the VMSC cannot be The problem of the access code used by the , is identified, so that the correct routing of the session cannot be performed. When the UE switches from the IMS domain to the CS domain, the CS domain call fails. Summary of the invention

In view of this, the main purpose of the present invention is to provide a method for updating a user terminal access code, which can re-allocate the UE access code and notify the UE to update in time when the location of the UE changes, and ensure handover call routing. The correctness.

Another object of the present invention is to provide an apparatus for updating a UE access code, which can reallocate a UE access code in time and provide it to a UE when the location of the UE changes, so as to ensure the correctness of the handover call routing.

In order to achieve the above object, the technical solution of the present invention is specifically implemented as follows:

A method for updating a user terminal access code, when a user access terminal adopts a dynamic access code, setting a re-allocation logic module for reallocating a user terminal UE access code, and presetting UE location information and UE access therein Correspondence of codes, the method includes the following steps:

A. The redistribution logic module acquires current location information of a UE whose location changes;

The redistribution logic module re-allocates a new UE access code to the UE according to the current location information of the UE and the preset correspondence relationship;

C. The redistribution logic module sends the reassigned UE access code to the call execution point, and the call execution point updates the UE access code saved by itself with the received UE access code.

A re-distribution determination module is configured to determine whether to re-allocate a new UE access code. The method for obtaining the current location information of the UE by the re-allocation logic module in step A is:

Al l. The redistribution determination module acquires update indication information indicating whether the location update is successful;

A12. If the update indication information indicates that the update is successful, the acquired current location information of the UE is sent to the redistribution logic module. The method for obtaining the update indication information by the redistribution determination module in step A1 is: the redistribution determination module acquires the update indication information from a location update response message in a UE location update process;

The method for obtaining the current location information of the UE by the redistribution determination module in step A12 is: the redistribution determination module acquires the current location information of the UE from the location update request message in the location update process.

The UE location update process includes:

a MSC/VLR to which the UE belongs carries the current location information of the UE in the location update request message, and sends the location update request message to the home location register HLR;

The HLR obtains the current location information of the UE from the received location update request message, and determines whether the location update is successful, generates and saves update indication information indicating whether the location update is successful, and carries the information in the location update response message. The UE belongs to the MSC/VLR.

The method for transmitting the acquired current location information of the UE to the redistribution logic module in step A12 is: the redistribution determination module sends the received location update request message to the redistribution logic module;

The entity to which the redistribution determination module belongs is an HLR; the entity to which the redistribution logic module belongs is a gsmSCF or a DTF AS having a DSF function.

After receiving the location change identifier indicating that the MSC/VLR of the UE belongs to the UE, the redistribution judging module acquires the current location information of the UE and sends the information to the reassignment logic module.

The method also includes: the UE has been registered in the IMS according to the protocol, and the two-way event subscription has been performed with the DTF AS;

The method for receiving the location change identifier by the redistribution determination module is: at the UE location During the update process, after receiving the location update accept message, the UE sets the location change identifier and sends the location change identifier to the redistribution determination module.

The method for the UE to send the location change identifier to the redistribution determination module is: according to the subscribed two-way event, triggering the UE to carry the set location change identifier in a SIP notification message or a SIP advertisement message, and send the message to the SIP notification message or the SIP advertisement message. Redistribution judgment module.

The entity to which the redistribution determination module and the redistribution logic module belong is the same as the gsmSCF or DTF AS with DSF function.

The method for reassigning the new UE access code by the re-allocation logic module in step B is: the re-allocation logic module selects the UE location preset by itself according to the current location information of the UE according to the received current location information of the UE. The access code corresponding to the information is used as the reassigned UE access code.

The method for sending the UE access code to the call execution point in step C is: the reassignment logic module carries the re-allocated UE access code in the USSD, and forwards the call to the call execution point via the MSC/VLR;

Or the reallocation logic module carries the re-allocated UE access code in the SIP notification message and sends the UE access code to the call execution point;

Or the reallocation logic module carries the re-allocated UE access code in a SIP advertisement message and sends the call to the call execution point.

The UE access code carried in the USSD is an E.164 number; and the UE access code carried in the SIP notification SIP Notify message or the SIP advertisement SIP Publish message is an E.164 number.

The call execution point is a UE.

The method also includes: DTF AS or gsmSCF with DSF function and HSS/HLR have two-way event subscription;

The method for updating the UE access code is: when the UE location changes, having a DSF After receiving the location update notification, the function gsmSCF or the DTF AS notifies the UE of the updated UE access code by using the unstructured supplementary service data USSD message or the SIP Notify message.

After receiving the current location information of the UE, and determining that the current location information of the UE is inconsistent with the UE location information stored by the UE, the current location information of the UE is sent to the redistribution logic module.

The method for receiving the current location information of the UE by the redistribution judging module is: when the UE needs to establish a call, the CS part of the UE sends a call setup request to the VMSC to which the UE belongs by establishing a Setup message, and the VMSC triggers the current carrying of the UE according to the preset CAMEL subscription information. The initial Initial DP message of the location information is sent to the DFS-capable redistribution decision module.

The entity to which the redistribution judgment module and the redistribution logic module belong is the gsmSCF having the DSF function.

The redistribution determination module sends the current location information of the UE carried in the Initial DP message to the redistribution logic module by using an existing synchronization mechanism.

The entity to which the redistribution determination module belongs is a gsmSCF having a DSF function; the entity to which the redistribution logic module belongs is a DTF AS.

The gsmSCF having the DSF function is combined with or separated from the IMS AS.

The current location information of the UE is the MSC VLR number of the MSC/VLR to which the UE belongs or the VMSC number of the VMSC to which the UE currently belongs.

The method for reassigning the new UE access code by the re-allocation logic module in step B is: the re-allocation logic module selects the UE location preset by itself according to the current location information of the UE according to the received current location information of the UE. The access code corresponding to the information. As the reassigned UE access code;

Or, the redistribution logic module will obtain the preset different MSC/VLR from the DTF AS. The corresponding access code is used as the reassigned access code.

The method for sending the ΌΈ access code to the call execution point in step C is: the re-allocation logic module carries the re-allocated UE access code in the USSD, and forwards the call to the first call execution point via the VMSC; or The redistribution logic module carries the re-allocated UE access code in the SIP advertisement message and sends the message to the first call execution point;

When the redistribution logic module is different from the entity to which the redistribution determination module belongs, the redistribution logic module also sends the re-allocated UE access code to the second call execution point by using an existing synchronization mechanism.

The first call execution point is a UE; and the second call execution point is a gsmSCF having a DSF function.

The UE access code carried in the USSD is an E.164 number; and the UE access code carried in the SIP notification message or the SIP advertisement message is an E.164 number.

In the step C, the re-allocation logic module sends the re-allocated UE access code to the call execution point. The method further includes:

The reassignment logic module determines whether the reassigned UE access code is consistent with the UE access code stored by itself, and if not, the reassigned UE access code continues to perform step C after being stored in itself; The process of the present invention is ended.

If the IMS call is switched to the CS domain, the UE access code is:

During the IMS call setup process, the network sends the dynamically allocated IM that is directly routed to the DTF PSI to the UE as the UE access code through the SIP response message of the call, or through the USSD message or the SIP Notify message during the IMS call. , or a SIP Publish message sends the dynamically allocated IMRN to the UE as a UE access code.

An apparatus for updating a UE access code, the apparatus comprising: a location information sending module for acquiring current location information of a UE; a reallocation logic module for reallocating a UE access code; and a call for updating a UE access code Execution point The redistribution logic module receives the current location information of the UE from the location information sending module, allocates a new UE access code to the UE according to the preset correspondence relationship and the obtained current location information of the UE, and accesses the new UE. The code is sent to the call execution point, and the call execution point updates the UE access code saved by itself with the received UE access code.

The apparatus further includes: a redistribution determination module for determining whether to reassign a new UE access code;

The redistribution determination module receives the information that the location of the UE changes, and notifies the location information sending module to acquire the current location information of the UE.

The re-allocation logic module is further configured with a comparison module, configured to determine whether the new UE access code is consistent with the UE access code stored by itself, and send a new UE access code to the call when the inconsistency occurs. Execution point.

The call execution point is a UE, or a UE and a gsmSCF having a DSF function. The entity to which the redistribution logic module belongs is a DTF AS, and the entity to which the redistribution determination module belongs is an HLR;

Or the entity to which the redistribution logic module belongs is a DTF AS, and the entity to which the redistribution judgment module belongs is a gsmSCF having a DSF function;

Or the entity to which the redistribution judgment module and the redistribution logic module belong are the gsmSCF having the DSF function;

Or the entity to which the redistribution logic module and the redistribution judgment module belong are both DTFs

AS.

As can be seen from the foregoing technical solution, the present invention presets the MSC in the redistribution logic module for realizing the UE access code redistribution when the UE adopts the dynamic handover number (the handover number is referred to as the UE access code in the present invention). Correspondence between the VLR number and the UE access code. When the location update is performed by the UE, after the relocation logic module acquires the UE location information, the UE access code, such as a VDN, is re-allocated according to the current location information of the UE, and the obtained UE is re-allocated. Access code The call execution point is sent to a call execution point such as a UE, or a DSF-enabled gsmSCF and a UE, and the call execution point is updated according to the received UE access code.

The invention further includes a method for dynamically providing a UE access code. Before the IMS call is switched to the CS domain, the UE access code may be that the network directly routes the SIP response message during the IMS call setup process. The dynamically allocated IMRN to the DTF PSI is sent to the UE, so that when the UE switches the call, the CS domain does not need to perform CAMEL interaction to complete the handover of the IMS domain to the circuit domain call, thereby reducing the setup delay of the handover call. The dynamically allocated IMRN may also be sent to the UE through an Unstructured Supplementary Service Data (USSD) message or a SIP Notify or SIP Publish message during an IMS call.

In addition, after the location update of the UE, the re-allocation logic module obtains the location information of the updated UE, the method further includes: the re-allocation logic module determines that the UE access code that needs to be updated, such as the VDN, is connected to the last allocated UE. If the code is inconsistent, if the VDN is inconsistent, the method of the present invention continues to re-allocate the UE access code, such as the VDN, and sends it to the UE; if they are consistent, the process of the present invention ends. BRIEF DESCRIPTION OF THE DRAWINGS

1 is a flow chart of switching an IMS domain call to a CS domain in the prior art;

2 is a flow chart of updating the UE access number according to the present invention;

Figure 3 is a flow chart of Embodiment 1 of the present invention;

4 is a flowchart of Embodiment 2 of the present invention;

FIG. 5 is a schematic structural diagram of an apparatus for updating a UE access code according to the present invention. Mode for carrying out the invention

The core idea of the present invention is: pre-set a re-allocation logic module for implementing UE access code re-allocation, and the re-allocation logic module re-allocates the UE according to the acquired UE location information. The code is input, and the reassigned UE access code is sent to the call execution point, and the call execution point is updated according to the received UE access code. The method further pre-sets a redistribution determination module for determining whether to re-allocate the UE access code, and after the redistribution determination module determines to re-allocate the UE access code, sends the current location information of the UE to the redistribution logic module.

1 is a flowchart of updating a UE access number according to the present invention. It is assumed that a correspondence between different MSC/VLR numbers and a UE access code is preset in a reallocation logic module for implementing UE access code re-allocation, and the UE occurs. In the case of roaming and the DTF AS is unchanged, the method of the present invention mainly comprises the following steps:

Step 200: The reallocation logic module acquires UE location information.

The location information of the UE is generally determined by the VMSC number. If the VMSC number changes, the location of the UE changes and the MSC/VLR to which the UE belongs has changed. Different MSC/VLRs are identified by different MSC/VLR numbers. When the MSC/VLR is in the visited place, the MSC/VLR can be referred to as a VMSC.

According to the agreement, when the location of the UE changes, the location update process will be triggered: the MSC/VLR to which the UE currently belongs will initiate a location update request to the HLR carrying the MSC/VLR number of the MSC/VLR to which the UE belongs, and the HLR returns to the MSC/ The location update response of the VLR carries update indication information indicating whether the location update is successful. If the update indication information indicates that the location update is successful, the MSC/VLR carries its temporary mobile subscriber identity (TMSI) to the location update accept via the SGSN. The message is sent to the UE, so that the UE can access the network through the received MSC/VLR corresponding to the TMSI. For the specific implementation of the location update process, refer to the related protocol, which will not be repeated here.

Based on the above existing location update process, the method for obtaining the UE location information by the redistribution logic module of the present invention is roughly divided into:

Method 1: a re-distribution determination module for determining whether to re-allocate the UE access code, and obtaining, from the location update response message, update indication information indicating whether the location update is successful, if the If the new indication information indicates that the update is successful, the redistribution determination module determines that the MSC VLR to which the UE belongs has changed, and sends the MSC/VLR number obtained from the location update request message to the redistribution logic module.

Method 2: After receiving the location update accept message, the UE sets a location change identifier indicating that the current MSC/VLR of the UE has changed, and sends the set location change identifier to the redistribution determination module, and then the redistribution determination module can The MSC/VLR number of the MSC/VLR to which the UE belongs is obtained from the HLR, and the obtained MSC/VLR number is sent to the redistribution logic module.

Method 3: When the UE needs to establish a call, the redistribution judging module may obtain the MSC/VLR number of the MSC/VLR to which the UE belongs from the initial Initial DP message, and determine that the MSC VLR number is inconsistent with the MSC VLR number stored by the UE. The obtained MSC/VLR number is sent to the redistribution logic module.

The redistribution judgment module and the redistribution logic module may be located in different entities or may be located in the same entity. When the redistribution judgment module and the redistribution logic module are located in different entities, the entities to which the redistribution judgment module belongs are: HLR, gsmSCF; the entities to which the redistribution logic module belongs are: gsmSCF, DTF AS, and the like. When the redistribution judgment module and the redistribution logic module are located in the same entity, the redistribution judgment module and the entity to which the redistribution logic module belongs are: HSS, HLR, DTF AS, gsmSCF, and the like.

For specific implementation, refer to Embodiment 1 and Embodiment 2 below, and details are not described herein.

Step 201: The re-allocation logic module re-allocates the UE access code according to the current location information of the UE and the preset information of the UE.

The preset information in the redistribution logic module has a corresponding relationship between the MSC/VLR number and the UE access code, and if the MSC/VLR number of the MSC/VLR to which the UE currently belongs is received by the re-allocation logic module, the MSC corresponding to the UE stored by the UE is stored. If the /VLR is inconsistent, the reassignment logic module reassigns the UE access code; otherwise, the current processing flow ends. In this step, it is assumed that the correspondence between the MSC/VLR address information and the VDN is preset in the UE access code re-allocation logic module, so that after the location update occurs, the UE re-allocates the logic module to obtain the updated location information of the UE. The updated MSC/VLR address information is indexed to the VDN corresponding to the updated MSC VLR address information, and then provided to the UE through an interaction interface set between the UE and the DSF-enabled gsmSCF or DTF.

The UE receives and stores the reassigned VDN, and deletes the previously stored VDN, that is, updates the VDN. The stored reassigned VDN is subsequently used when initiating a handover call.

Step 202: The reassignment logic module sends the reassigned UE access code to the call execution point, and the call execution point updates the local existing UE access code by using the received UE access code.

Here, the call execution point is a UE, or a gsmSCF and a UE having DSF functions.

It should be noted that, in the method that the UE access code is updated by the multiple MSC VLR numbers in the actual application, the foregoing steps are performed after the re-allocation logic module re-allocates the UE access code. The method of the present invention further includes: the re-allocation logic module determines whether the currently allocated UE access code is consistent with the locally stored UE access code, and if not, continues the method of the present invention to re-allocate the UE access code and send the UE access code to the UE. If they are consistent, the redistribution logic module ends the process of the present invention.

5 is a schematic structural diagram of an apparatus for updating a UE access code according to the present invention. As shown in FIG. 5, the apparatus for updating a UE access code of the present invention includes: a location information sending module for acquiring current location information of a UE, configured to re-allocate a UE a re-allocation logic module of the code, and a call execution point for updating the UE access code, the redistribution logic module receives the current location information of the UE from the location information sending module, according to the preset correspondence relationship and the obtained current location information of the UE. The UE allocates a new UE access code, and sends a new UE access code to the call execution point, and the call execution point updates its existing UE access code with the received UE access code. The call execution point is a UE, or a UE and a gsmSCF having a DSF function.

The apparatus further includes: a redistribution determination for determining whether to reassign a new UE access code The T/CN2006/002124 module, after receiving the information that the UE location changes, notifying the location information sending module to acquire the current location information of the UE.

In addition, a re-distribution logic module is further configured with a comparison module, configured to determine whether the new UE access code is consistent with the UE access code stored by itself, and send a new UE access code to the call when the inconsistency occurs. Execution point.

The present invention will be further described in detail with reference to the drawings and preferred embodiments.

FIG. 3 is a flowchart of Embodiment 1 of the present invention. In this embodiment, the entity to which the redistribution logic module and the redistribution determination module belong are both DTF AS and the DTF AS is unchanged; it is assumed that different MSC/VLRs are preset in the DTF AS. Correspondence between the number and the UE access code; and the UE is registered in the IMS according to the protocol, and after the S-CSCF returns a response to the registration success, the initial filtering criterion (iFC) data in the UE subscription data is used as the route. The AS of the policy decision point initiates a third-party registration, and the DTF AS, which is the routing policy decision point, returns a registration success response. After that, the UE and the DTF AS perform event subscription (SUBSCRIBE) in both directions, and the method further includes the following steps:

In the process of the existing UE location update, after receiving the location update accept message, the UE sets a location change identifier indicating that the current location has changed, and since the UE and the DTF AS have performed bidirectional The event is subscribed, so the UE is triggered to carry the location change identifier in a SIP notification (Notify) message or a SIP Publish message and send it to the DTF AS.

The DTF AS performs a two-way event subscription with the UE. Therefore, after the location update of the UE, the UE can learn from the DTF AS that the current MSC/VLR belongs to the UE through the event subscription.

Step 302: The DTF AS receives the SIP Notify or SIP Publish message from the UE, and determines that the MSC/VLR of the UE belongs to the current MSC/VLR according to the UE. New νινι3⁄4υ n UL t AS ψ -vi

Reassign the UE access code.

In this step, assuming that the access code stored in the DTF AS is a VDN, the DTF AS selects a VDN corresponding to the MSC/VLR number corresponding to the new VMSC number in the DTF AS according to the new VMSC number, as a reallocation. UE access code.

Step 303: The DTF AS forwards the re-assigned UE access code, that is, the VDN, to the UE in the SIP Notify message or the SIP Publish message, and the UE updates the local UE access code. '

The first embodiment of the present invention is proposed for implementing the IMS to CS call handover in the prior art. In this manner, when the UE initiates a call handover from the IMS domain to the CS domain, the locally updated E.164 format VDN number is used as the VDN number. The called number, the call setup request is sent to the VMSC, ensuring that the VMSC correctly routes the call according to the new VDN.

For the present embodiment, the DTF AS or the DSF-enabled gsmSCF subscribes to the location of the user to the HSS or the HLR through the subscription mode, and the DSF-enabled gsmSCF or DTF AS receives the change when the user location changes. After the location update notification, the UE is notified of the updated UE access code by using a USSD message or a SIP Notify message.

4 is a flowchart of Embodiment 2 of the present invention. The flow shown in FIG. 4 is proposed for implementing a call anchoring scheme by using the existing CAMEL technology. The main idea is to update the UE access code before the UE establishes a call connection, so that the UE adopts The access code corresponding to the current location establishes a call connection, thereby ensuring the correctness of the call routing. The UE includes an IMS part and a CS part. In this embodiment, the entity to which the redistribution logic module and the redistribution determination module belong are both a gsmSCF or a DTF AS having a DSF function; it is assumed that different MSC/VLR numbers and UE access codes are preset in the DSF-enabled gsmSCF or DTF AS. The corresponding implementation of the second embodiment includes the following steps: Step 400 - Step 402: The CS part of the UE sends a call setup request to the VMSC through a Setup message, and the VMSC triggers the Initial DP message to the DsmSCF module with the DSF function according to the CAMEL subscription information, and sends the implementation to the CS part of the UE. Call Proceeding message.

The Initial DP message carries the location information of the UE, such as the VMSC number, the CELL number, etc., and the gsmSCF stores the MSC/VLR number of the MSC/VLR to which the UE belongs before the current call.

Step 403: If the gsmSCF determines that the VMSC number carried in the Initial DP message is inconsistent with the locally stored MSC/VLR number, the gsmSCF is corresponding to the VMSC number carried in the Initial DP message and the different MSC/VLR numbers preset in the gsmSCF. The access code re-allocates the UE access code, or the gsmSCF re-allocates the UE access code from the preset different MSC/VLR access codes obtained by the DTF AS. The gsmSCF and the DTF AS can be set or combined. The gsmSCF with the DSF function can obtain the corresponding information of the MSC/VLR and the UE access code through the interface between the entities, or the two entities can store the same configuration information. In this step, it is assumed that the access code stored in the gsmSCF is an E.164 number.

Steps 404 to 405: The DSF-enabled gsmSCF saves the re-assigned E.164 number and carries the E.164 number in the CAMEL connect message, and sends it to the MSC/VLR, and the gsmSCF carries the re-allocated E.164 number. The UE sends the message to the UE, and the UE updates the local E.164 number.

Step 406 ~ Step 407: The VMSC receives the E.164 number and routes the call to the MGCF of the IMS domain through the IAM message. The MGCF sends the call to the correct DTF AS according to the E.164 number carried in the IAM message. .

Such processing ensures that the call is handed over by the correct DTF AS. It should be noted that, since the UE access codes corresponding to multiple MSC/VLR numbers are the same in the actual application, in the method for updating the UE access code, after the reallocation logic module reallocates the UE access code, The method of the present invention still further includes: redistribution logic The module determines whether the currently allocated UE access code is consistent with the local UE access code. If not, the re-allocation logic module continues the re-allocated UE access code after storing the UE. The access code is sent to the UE; if they are consistent, the redistribution logic module ends the process of the present invention.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalents, improvements, etc., which are made within the spirit and principles of the present invention, should be included. It is within the scope of the invention.

Claims

Claim

A method for updating a user terminal access code, characterized in that, when a user terminal adopts a dynamic access code, a redistribution logic module for reallocating a user terminal UE access code is set, and a UE is preset therein Correspondence between the location information and the UE access code, the method includes the following steps:

The method according to claim 1, wherein the method for determining whether to reassign a new UE access code is set, and the method for obtaining the current location information of the UE by the reassignment logic module in step A For:

A12. If the update indication information indicates that the update is successful, the acquired current location information of the UE is sent to the redistribution logic module.

The method according to claim 2, wherein the method for obtaining the update indication information by the redistribution determination module in step All is: the redistribution determination module is in the location update response message in the UE location update process Obtaining the update indication information;

The method for obtaining the current location information of the UE by the redistribution determination module in step A12 is: the redistribution determination module acquires the current location information of the UE from the location update request message in the UE location update process.

The method according to claim 3, wherein the UE location is updated The process includes:

The method according to claim 3, wherein: the method for transmitting the acquired current location information of the UE to the redistribution logic module in the step A12 is: the redistribution determination module receives the Location update request message is sent to the redistribution logic module;

The method according to claim 1, wherein the method for determining whether to reassign a new UE access code is set, and the method for obtaining the current location information of the UE by the reassignment logic module in step A is set. For:

After receiving the location change identifier indicating that the MSC VLR of the UE belongs to the UE, the relocation determination module acquires the current location information of the UE and sends the current location information to the redistribution logic module.

The method according to claim 6, wherein the method further comprises: the UE is registered in the IMS according to the protocol, and the bi-directional event subscription has been performed with the DTF AS; the redistribution judging module receives the location The method for changing the identifier is: In the UE location update process, after receiving the location update accept message, the UE sets the location change identifier and sends the location change identifier to the redistribution determination module.

The method according to claim 7, wherein the method for the UE to send the location change identifier to the redistribution determination module is: according to the subscribed two-way event The triggering UE carries the set location change identifier in the SIP notification message or the SIP advertisement message, and sends the identifier to the redistribution determination module.

The method according to claim 6, wherein the re-allocation judgment module and the entity to which the re-allocation logic module belongs are both a gsmSCF or a DTF AS having a DSF function.

The method according to claim 2 or 6, wherein the method for reallocating the new UE access code by the reassignment logic module in step B is: the redistribution logic module according to the received The current location information of the UE is used to select an access code corresponding to the UE location information that is preset by the UE to be the reassigned UE access code.

The method according to claim 10, wherein the method for transmitting the UE access code to the call execution point in step C is: the re-allocation logic module carries the re-allocated UE access code in In the USSD, forwarding to the call execution point via the MSC/VLR;

The method according to claim 11, wherein the UE access code carried in the USSD is an E.164 number; and the UE carried in the SIP notification SIP Notify message or the SIP advertisement SIP Publish message The access code is the E.164 number.

13. The method according to claim 11, wherein the call execution point is a UE.

The method according to claim 1, wherein the method further comprises: the DTF AS or the DSF-enabled gsmSCF and the HSS/HLR have performed bidirectional event subscription;

The method for updating the UE access code is: when the UE location changes, having a DSF After receiving the location update notification, the function gsmSCF or the DTF AS notifies the UE of the updated UE access code by using the unstructured supplementary service number 椐 USSD message or the SIP Notify message.

After receiving the current location information of the UE, and determining that the current location information of the UE is inconsistent with the location information stored by the UE, the current location information of the UE is sent to the redistribution logic module.

The method according to claim 15, wherein the method for receiving the current location information of the UE by the redistribution determining module is: when the UE needs to establish a call, the CS part of the UE sends a call setup to the VMSC to which the UE belongs by establishing a Setup message. The VMSC sends an initial Initial DP message carrying the current location information of the UE to the redistribution determination module with the DSF function according to the preset CAMEL subscription information.

The method according to claim 16, wherein: the redistribution determination module and the entity to which the redistribution logic module belongs are both gsmSCFs having DSF functions.

The method according to claim 17, wherein the redistribution determining module sends the current location information of the UE carried in the Initial DP message to the redistribution logic module by using an existing synchronization mechanism.

The method according to claim 18, wherein the entity to which the redistribution determination module belongs is a gsmSCF having a DSF function; and the entity to which the redistribution logic module belongs is a DTF AS.

20. The method according to claim 19, wherein the gsmSCF having the DSF function is combined or divided with the IMS AS.

The method according to any one of claims 3, 16, or 18, wherein the current location information of the UE is an MSC/VLR number or a UE of the MSC/VLR to which the UE belongs. The VMSC number of the current VMSC.

The method according to claim 15, wherein the method for reallocating a new UE access code by the reassignment logic module in step B is: the reassignment logic module according to the received current location information of the UE And selecting an access code corresponding to the UE location information that is preset by the UE to be the reassigned UE access code;

Alternatively, the redistribution logic module obtains, from the DTF AS, a preset different access code corresponding to the MSC/VLR as the reassigned UE access code.

The method according to claim 22, wherein the method for transmitting the UE access code to the call execution point in step C is: the re-allocation logic module carries the re-allocated UE access code in the USSD Forwarding to the first call execution point via the VMSC; or the reassignment logic module carries the reassigned UE access code in the SIP advertisement message and sends the message to the first call execution point;

The method according to claim 23, wherein the first call execution point is a UE; and the second call execution point is a gsmSCF having a DSF function.

The method according to claim 23, wherein the UE access code carried in the USSD is an E.164 number; and the UE access code carried in the SIP notification message or the SIP advertisement message is E.164 number.

The method according to any one of claims 1, 2, 6 or 15, wherein, in step C, the reassignment logic module sends the reassigned UE access code to the call execution point, where The method also includes:

The redistribution logic module determines whether the reassigned UE access code is consistent with the UE access code stored by itself, and if not, the reassigned UE access code continues after being stored in itself. Step c is performed; if they are consistent, the flow of the present invention is ended.

The method according to claim 1, wherein if the IMS call is switched to the CS domain, the UE access code is:

During the IMS call setup process, the network sends the dynamically allocated IMRN directly to the DTF PSI to the UE as the UE access code through the SIP response message of the call, or through the USSD message or the SIP Notify message during the IMS call. , or the SIP Publish message sends the dynamically allocated IMR to the UE as the UE access code.

An apparatus for updating a UE access code, where the apparatus includes: a location information sending module for acquiring current location information of a UE; a redistribution logic module for reallocating a UE access code; and updating a call execution point of the UE access code;

The redistribution logic module receives the current location information of the UE from the location information sending module, allocates a new UE access code to the UE according to the preset correspondence relationship and the obtained current location information of the UE, and accesses the new UE. The code is sent to the call execution point, and the call execution point updates the UE access code saved by itself with the received UE access code.

The device of claim 28, further comprising: a redistribution determination module for determining whether to reassign a new UE access code;

The device according to claim 28 or 29, wherein the reassignment logic module is further provided with a comparison module, configured to determine whether the new UE access code and the UE access code stored by itself are Consistent, when a discrepancy occurs, a new UE access code is sent to the call execution point.

The device according to claim 29, wherein the call execution point is a UE, or a UE and a gsmSCF having a DSF function.

32. Apparatus according to claim 29 wherein: said redistribution logic The entity to which the module belongs is a DTF AS, and the entity to which the redistribution determination module belongs is an HLR;

Or the entity to which the redistribution logic module belongs is a DTF AS, and the entity to which the weight allocation judgment module belongs is a gsmSCF having a DSF function;

AS.