WO2008119217A1 - Iuflex network system and method for solving delayed msc thereof - Google Patents

Abstract

An IuFlex network system and a method for solving the delayed MSC thereof are provided. The system includes: a MSC POOL mobile switching center provided with a MSC POOL of running MSC/VLR and backup MSC/VLR; a home location register HLR storing the subscription information of all users and the MSC/VLR number which each of the user belongs to; a gateway mobile switching center GMSC obtaining the users' route information from the HLR and routing callings; a base station controller RNC routing the uplink message of mobile terminal to the correct running MSC/VLR, and a mobile terminal UE. Through the solution, by adding backup MSC/VLR on MSC POOL and replacing the delayed running MSC/VLR with the backup MSC/VLR network element, the transaction of user cannot be affected.

Description

 IuFle network system and solution

 TECHNICAL FIELD The present invention relates to the field of mobile communications in the field of communications, and more particularly to an IuFle network system and a method for solving the problem of its work access location register downtime. Background technique

The IuFlex system is a technology in which a mobile switching center pool group (MSC POOL) is composed of a plurality of switching control nodes (MSCs), and a subordinate base station controller (BSC/KNC) and each MSC are respectively connected to achieve resource sharing purposes between MSCs. . When the MSC POOL first accesses, the RNC/BSC derives an Intra Domain NAS Node Selector according to the International Mobile Subscriber Identity (IMSI) provided by the user, and distributes the user to the internal algorithm through an internal algorithm. The service is processed on a specific MSC in the MSC POOL. The MSC assigns the user a Temporary Mobile Subscriber Identity (TMSI) containing a Network Resource Identity (NRI) field that uniquely points to the MSC within the MSC POOL. The services initiated by the user in the MSC POOL will use the TMSI containing the NRI. The RNC/BSC receives the message containing the TMSI and routes the message to the MSC that allocates the N I to ensure that all subsequent services are processed in the same MSC.

If the MSC network is temporarily unable to continue to provide services to users under the MSC, including the calling service and the called service. For the calling service initiated by the user, the MSC corresponding to the NRI in the original TMSI has been down, and the RNC cannot route the uplink message. For the called service, the HLR cannot obtain the roaming number from the original MSC and perform paging. Therefore, there is a need for an IuFlex network system and a solution for the work location register downtime to solve the problems in the related art described above. SUMMARY OF THE INVENTION It is an object of the present invention to provide an IuFlex network system and a method for solving the problem of its work location register downtime, which solves the MSC downtime problem by adding a network element in the mobile switching center pool group. In order to solve the above object, the present invention provides an IuFlex network system, the system comprising: W mobile switching center pool group, the mobile switching center pool group includes one or more first access location registers, and one or more first access location registers are switching centers in the mobile switching center pool group for accessing users Perform call control and service processing; a home location register, which stores the subscription information of all users and the number of the first visitor location register where the user is located; the gateway mobile switching center acquires the user's route from the home location register after receiving the incoming call request And routing the call; the base station controller, the base station controller routing the uplink message from the mobile terminal to one of the first visitor location registers by using the network resource identifier; and the mobile terminal is connected to one of the mobile switching center pool groups by the base station controller Or one of a plurality of first access location registers; wherein the mobile switching center pool group further includes one or more second visitor location registers, and one or more second visitor location registers are used for one of the mobile switching center pool groups Or multiple first visitor location registers provide backup, and in one When the visitor location register of the first plurality of downtime for replacement of one or more of a first visitor location register. Each of the one or more second visitor location registers has a corresponding temporary roaming number. One or more second visitor location registers are each assigned a corresponding network resource identifier. One or more second visitor location registers are configured with location area distribution information for the IuFlex network. The home location register is coupled to the one or more first visitor location registers and one or more second visitor location registers via a signaling transfer device. Optionally, the first access location register is a working access location register and the second access location register is a backup access location register. Optionally, the first access location register is a working access location register, and the first access location register is one or more working access location registers. According to another aspect of the present invention, a method for troubleshooting a mobile switching center of an IuFlex network system is provided, the method comprising the steps of:

A. The user accesses under the work visitor location register, and the work visitor location register synchronizes the user's international mobile subscriber identity code, the integrated service digital network number and the location information to the standby location register;

B. When the working access location register is down, the backup access location register takes over the working access location register and activates the signaling link of the home location register to the backup access location register. When the user is the calling user, the method includes the following steps:

C1, the calling user sends a message to the base station controller by using the temporary user identification code; C2, the base station controller routes the message to the backup access location register for processing;

C3. The backup visitor location register obtains an international mobile subscriber identity of the calling user equipment;

C4. The backup visitor location register obtains the subscription data of the calling user from the home location register; the home location register updates the working access location register number in the subscription data of the calling user to the backup access location register number; C5, the backup access location register is The calling user reassigns the temporary user identification code, and the temporary user identification code includes the network resource identifier used by the access location register;

C6. The backup visitor location register sends an initial address message to the target network, and the target network sends the call in progress message to the calling user;

C7, the target network call rings, and returns the address full message to the backup access location register, and the backup access location register sends a ringing to the calling user;

C8. The target network user picks up the phone and returns a response message to the backup access location register. The backup access location register sends a connection message to the calling user, and the call is connected. When the user is the called user, the method includes the following steps:

D1, the gateway mobile switching center sends a routing information request to the home location register; D2, the home location register uses the backup access location register number corresponding to the mobile switching center pool group, and sends the roaming number to the backup access location register; D3. The backup visitor location register sends a resume user data request message to the home location register;

D4. The home location register inserts the called user data, updates the working access location register number in the called user data to the backup access location register number, and returns to restore the called user data response message;

D5. After the data of the called user is restored, the backup visitor location register returns the roaming number to the home location register, and the home location register transmits the roaming number to the gateway mobile switching center;

D6. The gateway mobile switching center analyzes the roaming number, and routes the call to the backup access location register. D7. The backup access location register locates the base station controller where the called user is located according to the location information of the called user and the location area distribution information. And paging the called user;

D8, the called user responds to the paging, and the backup visitor location register reassigns the temporary user identifier to the called user, where the temporary user identifier includes a new network resource identifier;

D9. The called user uses the temporary user ID to interact with the backup visit location register and finally answer the call. The backup access location register reassigns the temporary user ID to the user in two phases. The two phases include: Phase 1: Update the user location on the backup visitor location register and transfer the user to another work access location register; Phase: After the first phase, when the user resides on the backup access location register, the user is transferred from the backup access location register to the working access location register, and the backup access location register is blocked between the home location register and the home location register. Signal the link and return to the backup state. The first phase includes the following steps:

Fl, through the maintenance management tool, simultaneously send a load reassignment command to the backup access location register and the base station controller;

F2. The mobile terminal under the backup access location register performs location update, sends a location update request message to the base station controller, and the base station controller packages the location update request message into an initial address message. Send to the backup access location register;

F3. The backup access location register authenticates and encrypts the mobile terminal;

F4. The backup visitor location register sends a temporary user identifier reassignment command to the mobile terminal, and the temporary user identifier reassignment command carries a non-broadcast location area and an empty network resource identifier, and the mobile terminal returns the temporary user identifier re-allocation completed. Message

F5. The mobile terminal saves the location area for reassigning the temporary user identification code, and re-initiates the location update by using the temporary user identification code;

F6. After receiving the location update request message, the base station controller sends the initial user equipment message to the new working visitor location register. F7. The new working visitor location register obtains the user authentication parameter from the home location register, and authenticates the user. ;

F8. After the authentication is passed, the home location register updates the user's working access location register number to a new working visitor location register number;

F9, a new work visit location register encrypts the user; F10, a new work visit location register sends a temporary subscriber identity reassignment command to the mobile terminal, sends a location update receive message to the mobile terminal, and the mobile terminal returns the temporary subscriber identity A redistribution completion message, wherein the reassignment command carries a network resource identifier with a new location area and a new work access location register. The second phase includes the following steps: Gl. The backup visit location register scans the mobile terminal currently performing the service, and sends a temporary user identifier re-allocation message to the users. The temporary user identifier re-allocation message carries the non-broadcast location area and the empty network resource. Identification

G2, after the current service ends, the mobile terminal initiates a new location update by using the temporary subscriber identity code; G3. After receiving the location update request message, the base station controller sends the initial user equipment message to the working visitor location register; G4. The work visitor location register obtains the user's authentication parameter from the home location register, and authenticates the mobile terminal;

G5, the work visitor location register sends a location update request message to the home location register, and the home location register updates the user's work visitor location register number to a new work visit location register number;

G6, the new work visit location register encrypts the user;

G7. The new work visitor location register reassigns the new temporary subscriber identity to the mobile terminal and returns a location update received message to the mobile terminal. Compared with the prior art, the present invention increases the backup access location register network element on the mobile switching center pool group in the IuFlex network system, so that the working access location register in the mobile switching center pool group fails after the access location The user's service under the register can be smoothly taken over the backup access location register, ensuring that the user's service is not affected, achieving zero, downtime, thereby improving the service quality of the operator and increasing the user's satisfaction with the service. Other features and advantages of the present invention will be set forth in the description which follows, and in part BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set forth in the claims The description is for explaining the present invention and does not constitute an limitation to the present invention. In the drawings: Figure 1 shows a block diagram of an IuFlex network system in accordance with a preferred embodiment of the present invention.Figure 2 shows a flow chart of a method for resolving a IuFlex network system mobile switching center downtime in accordance with the present invention. 3 is a flow chart showing a system for a user to receive a called call after an MSC failure in an IuFlex system in accordance with a preferred embodiment of the present invention. 4 is a system flow diagram of a user initiating a call service after an MSC failure in an IuFlex system in accordance with a preferred embodiment of the present invention. FIG. 5 illustrates a system flow diagram for implementing the first phase of a failed MSC recovery in an IuFlex system in accordance with a preferred embodiment of the present invention. 6 shows a system flow diagram for implementing a second phase of failed MSC recovery in an IuFlex system in accordance with a preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a structural diagram of an IuFlex network system in accordance with a preferred embodiment of the present invention. Referring to Figure 1, an IuFlex network system 100 in accordance with the present invention includes: a mobile switching center pool group 102 that includes one or more first access location registers, one or more first access location registers for the mobile switching The switching center in the central pool group is configured to perform call control and service processing on the access user; the home location register 104 stores the subscription information of all users and the number of the first visitor location register where the user is located; the gateway mobile switching center 106, After receiving the incoming call request, acquiring the routing information of the user from the home location register and routing the call; the base station controller 108, the base station controller routing the uplink message from the mobile terminal to one of the first access location registers by using the network resource identifier; The mobile terminal 110 is connected to one of the one or more first visitor location registers in the mobile switching center pool group by the base station controller; wherein the mobile switching center pool group 102 further includes one or more second visitor location registers, one Or multiple second visitor location registers for the mobile switching center pool group One or more first visitor location registers provide a backup and are used to replace one or more first visitor location registers when one or more first visitor location registers are down. Each of the one or more second visitor location registers has a corresponding temporary roaming number. One or more second visitor location registers are each assigned a corresponding network resource identifier. One or more second visitor location registers are configured with location area distribution information for the IuFlex network. The home location register is coupled to the one or more first visitor location registers and one or more second visitor location registers via a signaling transfer device. Optionally, the first access location register is a working access location register and the second access location register is a backup access location register. Optionally, the first access location register is a working access location register and the second access location register is one or more working access location registers. 2 is a flow chart showing a method of solving the IuFlex network system mobile switching center downtime in accordance with the present invention. Referring to FIG. 2, the method includes the following steps: Step S202: A user accesses a work visit location register, and a work visit location register synchronizes a user's international mobile subscriber identity, an integrated service digital network number, and location information to a backup visitor location register. Step S204: When the working access location register is down, the backup access location register takes over the working access location register and activates the signaling link of the home location register to the backup access location register. When the user is the calling user, the method includes the following steps:

C1, the calling user sends a message to the base station controller by using the temporary user identification code;

C2. The base station controller routes the message to the backup access location register for processing;

C3. The backup visitor location register obtains an international mobile subscriber identity of the calling user equipment;

C4. The backup visitor location register obtains the subscription data of the calling user from the home location register; the home location register updates the work access location register number in the subscription data of the calling user to the backup visitor location register number;

C5. The backup visitor location register reassigns the temporary user identifier to the calling user, and the temporary user identifier includes the network resource identifier used by the backup visitor location register;

C6. The backup visitor location register sends an initial address message to the target network, and the target network sends the call in progress message to the calling user; C7, the destination network call rings, and returns the address full message to the backup access location register backup access location register to send ringing to the calling user;

C8. The target network user picks up the phone and returns a response message to the backup access location register. The backup access location register sends a connection message to the calling user, and the call is connected. When the user is the called user, the method includes the following steps:

D1. The gateway mobile switching center sends a routing information request to the home location register.

The D2 home location register uses the backup access location register number corresponding to the mobile switching center pool group to send the roaming number to the backup access location register;

D3. The backup visitor location register sends a resume user data request message to the home location register;

D4. The home location register inserts the called user data, updates the working access location register number in the called user data to the backup access location register number, and returns to restore the called user data response message;

D5. After the data of the called user is restored, the backup visitor location register returns the roaming number to the home location register, and the home location register transmits the roaming number to the gateway mobile switching center;

D6. The gateway mobile switching center analyzes the roaming number and routes the call to the backup access location register;

D7. The backup visitor location register locates the base station controller where the called user is located according to the location information of the called user, and the location area distribution information, and pages the called user; D8, the called user responds to the paging, and the backup access location The register reassigns the temporary user identifier to the called user, where the temporary user identifier includes a new network resource identifier;

D9. The called user uses the temporary user ID to interact with the backup visit location register and finally answer the call. The backup visitor location register redistributes the temporary user ID for the user in two phases, two phases including: Phase 1: Update the user location on the backup visitor location register and transfer the user to another work access location register; Stage 2: After the first phase, when the user resides on the backup visitor location register, the user is The transfer from the backup access location register to the working access location register, and the backup access location register occlusion and the home location register signaling link, and return to the backup state. The first phase includes the following steps:

Fl, through the maintenance management tool, simultaneously send a load reassignment command to the backup access location register and the base station controller;

F2, the mobile terminal under the backup access location register performs location update, sends a location update request message to the base station controller, and the base station controller packages the location update request message into an initial address message and sends the message to the backup access location register;

F3. The backup access location register authenticates and encrypts the mobile terminal;

F4. The backup visitor location register sends a temporary user identifier reassignment command to the mobile terminal, and the temporary subscriber identity re-allocation command carries a non-broadcast location area and an empty network resource identifier, and the mobile terminal returns a message that the temporary subscriber identity re-allocation is completed. ;

F5. The mobile terminal saves the location area for reassigning the temporary user identification code, and re-initiates the location update by using the temporary user identification code;

F6. After receiving the location update request message, the base station controller sends the initial user equipment message to the new working visitor location register. F7. The new working visitor location register obtains the user authentication parameter from the home location register, and authenticates the user. ;

F8. After the authentication is passed, the home location register updates the user's working access location register number to a new working visitor location register number;

F9, a new work visit location register encrypts the user; F10, a new work visit location register sends a temporary subscriber identity reassignment command to the mobile terminal, sends a location update receive message to the mobile terminal, and the mobile terminal returns the temporary subscriber identity Reassignment completion message, wherein the reassignment command carries a new location area and a new work access location The network resource identifier of the register. The second phase includes the following steps:

Gl. The backup visitor location register scans the mobile terminal currently performing the service, and sends a temporary user identifier reassignment message to the users. The temporary subscriber identity re-allocation message carries the non-broadcast location area and the empty network resource identifier;

G2. After the current service ends, the mobile terminal initiates a new location update using the temporary subscriber identity code;

G3. After receiving the location update request message, the base station controller sends an initial user equipment message to the working visitor location register; G4, the working visitor location register obtains the user's authentication parameter from the home location register, and authenticates the mobile terminal;

G5, the work visitor location register sends a location update request message to the home location register, and the home location register updates the user's work visitor location register number to a new work visitor location register number; G6, the new work visitor location register encrypts the user;

G7. The new work visitor location register reassigns the new temporary subscriber identity to the mobile terminal and returns a location update received message to the mobile terminal. Another embodiment of the present invention will now be described with reference to Figure 1 again. In the traditional 2G network, the network structure of the base station controller (RNC) and the switching control node (MSC) is a tree structure, and the RNC can only be controlled by one MSC. If all the nodes fail, if the MSC fails, the managed RNC will not work normally, which will cause the service in the service area to be interrupted. The invention provides the IuFlex network system technology based on the R5 version of the 3GPP. The technology enables the NC to belong not only to one MSC server but also to the RNC to connect multiple MSC network elements, which can be simultaneously managed by multiple network elements, RNC The end user can register to any node in the network element according to the principle of load balancing. Referring to FIG. 1, the system of this embodiment includes: a Home Location Register (HLR), a Gateway Mobile Switching Center (GMSC), a Mobile Switching Center Pool Set (MSC POOL), a Base Station Controller RNC, and a User (UE). The MSC POOL includes a working access location register (MSC/VLR) and a backup MSC/VLR, and the working MSC/VLR and the backup MSC/VLR are electrically connected. The working MSC/VLR is the switching center in the MSC POOL, responsible for the call control and service processing of the MSC POOL access user; there are multiple working MSC/VLRs in the MSC POOL, and each working MSC/VLR is assigned one or more different Network Resource Identifier (NI); In the Temporary Subscriber Identity (TMSI) redistribution process, the NRI is passed to the mobile handset UE as part of the TMSI. Each working MSC/VLR has a temporary roaming number, which is stored in the user's location update process along with the user's International Mobile Subscriber Identity (IMSI), stored in the Home Location Register (HLR), and the backup MSC/VLR is The working MSC VLR in the MSC POOL provides backup functionality. The home location register HLR holds the subscription information of all users and the number of the working MSC/VLR where the user is located, and the HLR is respectively connected to the working MSC/VLR and the backup MSC/VLR in the MSC POOL. The HLR also configures the backup MSC/VLR number corresponding to the MSC POOL. If the link to the MSC VLR in the MSC POOL fails during a certain exchange process, the message is sent to the backup MSC VLR. After receiving the incoming call request, the gateway mobile switching center GMSC obtains the routing information of the user from the HLR and routes the call, and the GMSC connects with the working MSC/VLR in the MSC POOL. Through the NRJ, the base station controller RC (or BSC) routes the mobile phone uplink message to the correct working MSC/VLR, which is respectively connected with the working MSC VLR and the backup MSC VLR in the MSC POOL, and generally has multiple RNCs under the MSC POOL. . The mobile handset UE is connected to the working MSC VLR and the backup MSC/VLR in the MSC POOL through a wireless signal connection between the RNCs. In the IuFlex network system, an MSC POOL is a common service area formed by similar network elements. The MSC POOL simultaneously manages the network element nodes of its lower layer, and the plurality of MSC servers form an MSC POOL. Once the working MSC/VLR server is down, the HLR pre-configures the correspondence between the MSC POOL and the backup MSC VLR NUMBER (temporary roaming number) according to the configured backup MSC/VLR NUMBERC HLR. After the unreachable, the backup MSC VLR NUMBER is used to interact with the backup MSC/VLR acquisition. When the user re-accesses the network (location update, call attempt, etc.), the RNC, HLR or GMSC assigns the real-time user to the backup MSC/VLR in the MSC POOL, and the HLR updates the user data. The MSC/VLR NUMBER is the number of the backup MSC VLR. The user responsible for the MSC server can be taken over immediately by the backup MSC/VLR in the MSC POOL to ensure that the user's service is not affected, and the "zero" downtime is realized. . The working principle is as follows: The working MSC/VLR runs the same software and data at the same time as the backup MSC/VLR. The backup MSC VLR is the mirror of the working MSC VLR, and the signaling link between the backup MSC VLR and the external network element HLR/GMSC/RNC is Inactive state, once the working MSC/VLR fails, the sub-MSC VLR will be activated as the working MSC/VLR, then the RNC selects the corresponding MSC server in the MSC POOL to achieve real-time network smooth security guarantee. The invention also provides a method for providing a monthly service for a user under the MSC/VLR after the MSC/VLR is replaced by the MSC/VLR after the MSC/VLR is down in the MSC POOL, in the method, the mobile phone The user accesses the working MSC/VLR, and the working MSC/VLR synchronizes the user's IMSI, ISDN and location information to the backup MSC VLR; when the working MSC/VLR is down, the backup MSC/VLR takes over the working MSC VLR, and the user information is obtained. Sended to the HLR, the signaling link of the HLR is activated, and the backup MSC/VLR takes over the work of the MSC/VLR to ensure that the user's service is not affected, and the "zero" downtime is realized. However, when the user has problems in the calling and called calling services, the steps of the backup MSC/VLR to solve the MSC failure in the IuFlex system by replacing the down-work MSC/VLR are different, see Figures 3 and 4. . 3 is a flow chart of a system for a user to receive a called call after implementing an MSC failure in the IuFlex system in accordance with a preferred embodiment of the present invention. During daily operation, the backup MSC/VLR synchronizes the IMSI, ISDN and location information of all users from the working MSC/VLR. After the MSC/VLR is down, the backup MSC VLR replaces the working MSC/VLR, assigns roaming numbers, and distributes the paging users according to the user location and the configured network area. After the user accesses, the user is assigned a new TMSI, and finally connects. call. After the process ends, the subsequent service uses the new TMSI allocated by the backup MSC/VLR to process the backup MSC/VLR until the downtime MSC/VLR is restored, and the backup MSC/VLR exits the service. The method for solving the IuFlex network system MSC user receiving the called call includes the following steps: Step 301: When the working MSC/VLR is in normal operation, synchronize the IMSI, ISDN, and location information of the user to the backup MSC/VLR; Step 302: The working MSC VLR is down, the signaling link of the HLR to the working MSC VLR is interrupted, and the HLR provides a roaming number message to the working MSC/VLR, and is routed to the backup MSC/VLR; Step 303, the user dials the mobile terminal. The GMSC receives the initial address message and sends a routing information request to the HLR. Step 304: Because the signaling link to the working MSC VLR has been interrupted, the HLR sends the provided roaming number according to the configuration, using the backup MSC/VLR number corresponding to the MSC POOL. The message is backed up to the MSC VLR. Step 305: The backup MSC VLR initiates the process of restoring the user data because there is no subscription information of the user, and re-acquires the user subscription from the HLR. In this process, the HLR saves the number of the backup MSC VLR to the user data; in step 306, the backup MSC/VLR assigns the roaming number and returns a roaming number response to the HLR. The HLR sends a routing information response to the GMSC, where the roaming number is carried; Step 307, the GMSC routes the call according to the roaming number, and sends an initial address message to the backup MSC/VLR; Step 308, the MSC/VLR stores the location information of the user and IMSI, and configured the area distribution information of the network, so it can determine the RNC where the user is located, send a message to the corresponding area or page, the user returns a page response, and the RNC packages the initial user equipment message to the backup MSC/VLR; Step 309: The backup MSC/VLR obtains the authentication parameter from the HLR, and then performs authentication and encryption on the mobile terminal. Step 310: The backup MSC/VLR initiates a TMSI redistribution process to the mobile terminal, and allocates the TMSI with the NI to the mobile. Step 311: The backup MSC VLR sends a call setup message to the user; Step 312, the mobile terminal rings, returns a ringing message, and the backup MSC VLR sends the address to the GMSC; Step 313, the mobile terminal picks up the phone, returns the connection message, and backs up The MSC/VLR sends a response to the GMSC and the call is connected. 4 is a system flow diagram of a user initiating a call service after a working MSC VLR failure in an IuFlex system according to a preferred embodiment of the present invention. After the user who accesses the working MSC VLR initiates a call, the RNC obtains the NRI from the user message of the mobile phone uplink, because the NRI originally "the MSC/VLR should be down, so the RNC routes the message to the backup MSC/VLR. ^ The MSC VLR controls the call. Other services initiated by the user, such as location update, short messages also follow the same principle. After the process ends, since the user has already allocated a new TMSI, the user's subsequent services pass the new TMSI. After the backup MSC/VLR processing, until the downtime MSC/VLR is restored, the backup MSC VLR is taken out of service. The method for initiating the call service of the IuFlex network system working MSC/VLR down user includes the following steps: Step 401: The user UE sends the CM service Requesting to the RNC, the TMSI in the message contains the NRI field of the original working MSC/VLR, and the RNC identifies the NRI. Since the original working MSC/VLR has been down, the packetized initial user equipment message is routed to the backup MSC. /VLR; Step 402, the backup MSC/VLR does not have the specific data of the user, so first requests the authentication information of the user from the HLR, and sends an authentication parameter request to the HL. R, the HLR sends a nutrition parameter response; Step 403: The backup MSC VLR performs authentication, sends an authentication message to the user, and the user returns an authentication response. Step 404: After the authentication is passed, the backup MSC/VLR sends a location update request to the HLR. The HLR inserts the user data into the backup MSC/VLR, saves the number of the backup MSC/VLR/ where the user is located, and returns a location update response. In step 405, the backup MSC/VLR sends an encryption command to the RNC, and the RNC and the mobile terminal encrypt, and then send The encryption is completed to the backup MSC/VLR; Step 406, because the MSC/VLR accessed by the user changes, the MSC/VLR initiates the TMSI redistribution process; Step 407, the user sends a call setup message to the backup MSC VLR, and backs up the MSC VLR. Analyze the call route, send the initial address message to the target network, send the call in progress message to the user; Step 408, the target network call rings, returns the address full message, and the backup MSC VLR sends a ringing to the mobile terminal; Step 409: The target network user picks up the phone, returns a response message, and the backup MSC/VLR sends a connection message to the user, and the call is connected. After the above-mentioned MSC downtime problem in the IuFlex system is resolved, whether the user calls the call or is called, the original MSC VLR of the downtime is required to recover the fault and re-enter the service, and back up the MSC VLR. You need to exit the service and return to the backup state. Therefore, the backup MSC/VLR initiates the load redistribution process. The process is divided into two phases. The recovery process of the first phase can be seen in Figure 5, and the recovery process of the second phase can be seen in Figure 6. FIG. 5 is a flowchart of a system for implementing the first stage of faulty MSC VLR recovery in the IuFlex system according to the present invention. This phase lasts twice the periodic location update duration. The purpose is to transfer the users who have performed the periodic location update on the backup MSC/VLR to other MSC/VLRs. The specific steps are as follows: Step 501: Through the maintenance management tool, The load reassignment command is simultaneously sent to the backup MSC/VLR and the RNC. After receiving the message, the RNC does not distribute the new MSC POOL to the backup MSC/VLR. Step 502: Back up the mobile under the MSC/VLR. The terminal performs location update, sends a location update request, and the RNC packages the initial address message to the backup MSC VLR. Step 503: The backup MSC/VLR performs the right and encryption on the mobile handset. Step 504: The backup MSC/VLR sends a TMSI reassignment command. To the mobile phone, which carries the non-broadcast location area and the null NRI, and simultaneously sends the location update to receive the mobile handset, and the mobile handset returns to the TMSI reallocation completion; Step 505, the mobile handset saves the non-broadcast location area in the TMSI reallocation, and the cell broadcast The location area comparison, the two are different, so the user re-initiates the location update using the TMSI; step 506, the RNC receives the location update request, Because the NRI in the TMSI is an empty NRI, the working MSC/VLR accessed by the user is reassigned. The working MSC VLR is a new working MSC/VLR other than the backup MSC/VLR in the MSC POOL, and sends the initial user equipment message to the new Working MSC/VLR; Step 507, because there is no user data on the new working MSC VLR, so first obtain the user authentication parameter from the HLR, and authenticate the user; Step 508, after the authentication is passed, the new working MSC VLR sends the location update and clear request to the HLR, the HLR inserts the user data, and returns a location update response, and the HLR updates the user's working MSC/VLR number to the new working MSC/VLR number. Step 509, the new working MSC VLR encrypts the user; Step 510, the new working MSC/VLR sends a TMSI reassignment command to the mobile handset, carries the new location area and the NRI of the MSC/VLR, and simultaneously sends the location update to receive Mobile phone, mobile phone returns TMSI redistribution completed. After the first phase of the backup MSC VLR load re-allocation process is completed, the users who have accessed the backup MSC/VLR and performed location update are all assigned to other working MSC VLRs. Only the users currently performing services are still ^Sub-MSC/VLR is the main player. Therefore, the second stage is to solve the redistribution problem of this part of the user. Figure 6 is a system flow chart for implementing the second stage of the faulty MSC/VLR recovery in the IuFlex system. The specific steps of this stage are as follows: Step 601 The backup MSC VLR scans the mobile phone currently performing the service, and sends a TMSI re-allocation message to the users; wherein the non-broadcast location area and the null NRI are carried, the user records the information, and returns the TMSI reallocation completion; Step 602, the mobile phone is in the current service. After the end, since the recorded non-broadcast location area and the cell broadcast location area are different, a new location update is initiated using the TMSI described above; Step 603, the RNC receives the location update request, because the NRI is null NRI, so the reallocation is reallocated. The working MSC/VLR accessed by the user, the working MSC/VLR is a new working MSC/VLR other than the backup MSC/VLR in the MSG POOL, and sends an initial user equipment message to the new working MSC/VLR; Step 604, New The working MSC/VLR has no user information, so the HLR obtains the user's authentication parameters and authenticates the mobile terminal; Step 605, New The working MSC VLR sends a location update request to the HLR, the HLR inserts the user data into the new working MSC/VLR, updates the saved user's current VLR number, and returns a location update response, and the HLR updates the user's working MSC/VLR number to the new MSC/ VLR number; Step 606, the new working MSC VLR encrypts the user; Step 607: The new working MSC/VLR allocates a new TMSI to the mobile handset, which includes the NRI of the MSC/VLR, and returns a location update to receive the mobile handset. After the end of the second phase, all mobile handsets have been moved from the MSC/VLR to the working MSC/VLR, and the backup MSC/VLR is blocked to the HLR signaling link and returns to the backup state. However, for the purposes of the present invention, other techniques may be employed, such as a connection between the HLR and the working MSC VLR and the backup MSC/VLR, which may be performed by a signaling transfer point STP; The base station controller may also be a BSC, or both the RNC and the BSC may coexist in the same network. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claims 1. An IuFle network system, the system comprising:  a mobile switching center pool group, the mobile switching center pool group including one or more first access location registers, the one or more first access location registers being a switching center in the mobile switching center pool group, Perform call control and service processing on access users;  a home location register, which stores subscription information of all users and a number of the first visitor location register where the user is located;  The gateway mobile switching center obtains routing information of the user from the home location register and routes the call after receiving the incoming call request;  a base station controller, the base station controller routing, by the network resource identifier, an uplink message from the mobile terminal to one of the first visitor location registers;  a mobile terminal connected to one of the one or more first access location registers in the mobile switching center pool group by the base station controller;  It is characterized in that  The mobile switching center pool set further includes one or more second access location registers, the one or more second access location registers being used to be the one or more first in the mobile switching center pool group The visitor location register provides a backup and is used to replace one or more of the first visitor location registers when one or more of the first visitor location registers are down. 2. The system of claim 1, wherein each of the one or more second access location registers has a respective temporary roaming number. 3. The system of claim 2, wherein the one or more second access location registers are each assigned a respective network resource identifier. 4. The system of claim 3, wherein the one or more second access location registers are each configured with location area distribution information for the IuFlex network. 5. The system according to claim 4, wherein the home location register and the one or more first visitor location registers and the one or more second visitor location registers are translated by signaling Connect the device to connect. The system according to any one of claims 1 to 5, wherein the first access location register is a work access location register, and the second visitor location register is a backup access location register. The system according to any one of claims 1 to 5, wherein the first visitor location register is a work visitor location register, and the second visitor location register is one or more of the work visits Location register. 8. A method of resolving a downtime of a mobile switching center of an IuFlex network system, the method comprising the steps of:  A. The user accesses the work visitor location register, and the work visitor location register synchronizes the user's international mobile subscriber identity, the integrated service digital network number, and the location information to the backup visitor location register;  B. When the working access location register is down, the backup access location register replaces the working access location register and activates a signaling link of the home location register to the backup access location register. 9. The method according to claim 8, wherein when the user is a calling user, the method comprises the following steps:  C1, the calling user sends a message to the base station controller by using a temporary user identification code; C2. The base station controller routes the message to the backup access location register for processing;  C3. The access location register obtains the international mobile subscriber identity of the calling user equipment.  C4. The backup visitor location register acquires subscription data of the calling user from the home location register; the home location register updates a working access location register number in the subscription data of the calling user to a backup access location. Register number  C5. The backup visitor location register reassigns a temporary user identifier to the calling user, and the temporary user identifier includes a network resource identifier used by the backup visitor location register; C6. The backup visitor location register sends an initial address message to the target network, and the target network sends a call in progress message to the calling user. C7, the target network call rings, and returns an address full message to the backup visitor location register, and the backup visitor location register sends a ringing to the calling user;  C8. The target network user picks up the phone, and returns a response message to the backup access location register, where the backup visitor location register sends a connection message to the calling user, and the call is connected. The method according to claim 8, wherein when the user is a called user, the method comprises the following steps:  D1. The gateway mobile switching center sends a routing information request to the home location register. D2, the home location register uses the backup access location register number corresponding to the mobile switching center pool group, and sends the roaming number to the backup access location register;  D3. The backup visitor location register sends a resume user data request message to the home location register.  D4. The home location register inserts the called user data, updates the working access location register number in the called user data to a backup access location register number, and returns a resumed called user data response message;  D5. After the recovery of the called user data is completed, the backup visitor location register returns the roaming number to the home location register, and the home location register transmits the roaming number to the gateway mobile switching center;  D6. The gateway mobile switching center analyzes the roaming number, and 4 calls are routed to the backup access location register.  D7. The backup visitor location register locates the base station controller where the called user is located, and searches for the called user according to the location information of the called user and the location area distribution information.  D8, the called user responds to the paging, and the backup access location register reassigns the temporary user identification code to the called user, where the temporary user identification code includes a new network resource identifier; D9. The called user performs interaction with the backup visit location register by using the temporary user identifier, and finally answers the call. The method according to claim 9 or 10, wherein the backup access location register reassigns the temporary subscriber identity to the user comprises two phases, the two phases comprising: Updating the user location on the backup access location register and transferring the user to another work access location register;  Second stage: after the first phase, when the user resides on the backup access location register, the user is transferred from the backup access location register to the working access location register, and the backup access The location register occludes the signaling link with the home location register and returns to the split state. 12. The method of claim 11 wherein the first phase comprises the steps of:  Fl, sending, by the maintenance management tool, the load reassignment command to the backup visitor location register and the base station controller simultaneously;  F2. The mobile terminal under the backup access location register performs location update, and sends a location update request message to the base station controller, and the base station controller packages the location update request message into an initial address message and sends the message to the backup. Access location register;  F3. The backup visitor location register authenticates and encrypts the mobile terminal; F4. The backup visitor location register sends a temporary subscriber identity re-allocation command to the mobile terminal, where the temporary subscriber identity re-allocation command carries a non-broadcast location area and an empty network resource identifier, and the mobile terminal returns a temporary User identification code redistribution completed message; F5. The mobile terminal saves a location area for performing re-allocation of the temporary user identifier, and re-initiates the location update by using the temporary user identifier.  F6. After receiving the location update request message, the base station controller sends an initial user equipment message to a new working access location register.  F7. The new work visit location register obtains a user authentication parameter from the home location register, and authenticates the user;  F8. After the authentication is passed, the home location register updates the working access location register number of the user to a new working access location register number;  F9. The new work visit location register encrypts the user; F10. The new work visit location register sends a temporary subscriber identity reassignment command to the mobile terminal, sends a location update received message to the mobile terminal, and the mobile The terminal returns a temporary subscriber identity re-allocation complete message, where the redistribution command carries a network resource identifier of the new location area and the new working visitor location register. The method of claim 11, wherein the second phase comprises the following steps: G1, the backup visitor location register scans the mobile terminal currently performing the service, and sends a temporary subscriber identity re-allocation message to the users, where the temporary subscriber identity re-allocation message carries a non-broadcast location area and an empty network resource identifier. ;  G2, after the current service ends, the mobile terminal uses the temporary user identification code to initiate a new location update;  G3. After receiving the location update request message, the base station controller sends an initial user equipment message to the working access location register.  G4. The working visitor location register obtains an authentication parameter of the user from the home location register, and performs authentication on the mobile terminal.  G5. The working visitor location register sends a location update request message to the home location register, where the home location register updates the working access location register number of the user to a new working visitor location register number;  G6. The new work visit location register encrypts the user;  G7. The new work visit location register reassigns a new temporary user to the mobile terminal and returns a location update received message to the mobile terminal.