CN1859785A - Moving exchanging center switching method of location updating and user imputing - Google Patents

Abstract

The invention discloses a location update method, which mainly includes: a user mobile station initiates a location update; a mobile switching center responding to the location update allocates a temporary mobile user identity containing information indicating that the user belongs to the mobile switching center to the user mobile station, Complete location update. Correspondingly, the invention also discloses a mobile switching center switching method where the user belongs. In the present invention, by increasing the allocation process of the temporary mobile user identity, the mobile service switching center allocates the temporary mobile user identity when the user location is updated or a service request is made, and the base station controller selects the mobile switching center according to the network resource indication contained in the temporary mobile user identity in the message , so as to realize the upgrade and maintenance of a mobile switching center connected to the base station controller, and after overload or breakdown, other available mobile switching centers connected to it can serve users within the coverage of the base station controller.

Description

Mobile Switching Center Handover Method Based on Location Update and Subscriber Attribution

technical field

The present invention relates to the technical field of mobile communication, and more specifically, the present invention relates to a mobile switching center switching method for location update and user belonging in a code division multiple access mobile communication network.

Background technique

Usually, the networking mode in the mobile communication network is star-shaped. For example, in the code division multiple access mobile communication network, a base station controller (Base Station Control, BSC) can only be connected to a mobile switching center (Mobile Switch Center, MSC). One MSC can be connected to multiple BSCs, as shown in Figure 1, this 1:N relationship between MSCs and BSCs restricts the flexibility of networking. First, if it is necessary to add an MSC node to the existing In the network, at least one BSC device must be added at the same time (even if the access network coverage and user processing capacity are sufficient), otherwise the newly added MSC will not work; in addition, the user capacity of the current MSC is increasing, when an MSC In the event of downtime for upgrade maintenance, overload or downtime, all BSCs connected to the MSC will lose their function, and users within the wireless range covered by all BSCs connected to the MSC will not be able to perform circuit business communications. The impact is very large, and operators cannot tolerate it. The industry urgently needs to realize that after an MSC connected to a BSC is upgraded and maintained, overloaded or crashed, other available MSCs connected to it can serve users within the coverage of the BSC.

Contents of the invention

The technical problem solved by the present invention is to provide a mobile switching center switching method for location update and user attribution, so as to realize the upgrade and maintenance of an MSC equipment connected to the BSC, and after overload or crash, other available MSCs connected to it can be Serve users within the coverage of the BSC.

In order to solve the above problems, the location update method of the present invention includes:

a. The user mobile station initiates a location update;

b. The mobile switching center responding to the location update assigns the mobile station of the user a temporary mobile user identity containing information indicating that the user belongs to the mobile switching center, and completes the location update.

Wherein, the information indicating that the user belongs to the mobile switching center is a network resource indication.

Wherein, step a specifically includes:

a1. The user mobile station sends a location update message to the base station controller;

a2. The base station controller detects whether the location update message carries network resource indication information indicating that the user belongs to a mobile switching center, and if the check result is yes, then sends a location update message to the mobile switching center indicated by the network resource indication , otherwise, a location update message is sent to the MSC to which the user's International Mobile Station Identity is routed.

Wherein, step b specifically includes:

b1. The mobile switching center responding to the user location update returns a temporary mobile user identity allocation message carrying a network resource indication to the user mobile station;

b2. The user mobile station returns a temporary mobile user identity allocation completion message to the mobile switching center;

b3. The mobile switching center returns a location update completion message to the mobile station of the user.

Correspondingly, a kind of user home mobile switching center switching method of the present invention, this method mainly comprises:

A. The base station controller determines that the mobile switching center to which the user belongs is unavailable, and the mobile station of the user initiates a location update;

B. The base station controller selects a mobile switching center from a plurality of connected mobile switching centers as the mobile switching center to which the user belongs;

C. The mobile switching center selected by the base station controller assigns to the mobile station of the user a temporary mobile user identity containing information indicating that the user belongs to the selected mobile switching center, and switches to the mobile switching center to which the user belongs.

Optionally, step A specifically includes:

The user's mobile station uses the temporary mobile user identity that contains the network resource indication to perform location registration. The base station controller determines that the mobile switching center to which the user belongs to the temporary mobile user identity is unavailable. Select an available mobile switching center and send a location update request message to it;

The mobile switching center selected by the base station controller finds that the temporary mobile user identity of the user is not allocated by itself, and sends a temporary mobile user identity allocation message;

After receiving the mobile user identity distribution message, the mobile station of the user deletes the temporary mobile user identity stored locally, returns a distribution completion message, and the base station controller forwards the message to the mobile switching center selected by it;

The mobile switching center selected by the base station controller returns a location registration rejection message to the user mobile station;

The subscriber mobile station sends a location update message to the base station controller.

Optionally, step A specifically includes:

The user's mobile station uses the temporary mobile user identity that contains the network resource indication to initiate the call. The base station controller determines that the mobile switching center to which the temporary mobile user identity points to is unavailable, and then connects from multiple mobile switching centers according to the local policy. Select one of the available mobile switching centers, and send a connection management CM service request message to it;

The mobile switching center selected by the base station controller finds that the temporary mobile user identity is not allocated by itself and the mobile switching center to which the user who originally allocated the temporary mobile user identity belongs is unavailable, then issues a temporary mobile user identity allocation message;

After receiving the temporary mobile user identity allocation message, the user mobile station deletes the locally stored temporary mobile user identity, returns a temporary mobile user identity allocation completion message, and the base station controller forwards the temporary mobile user identity allocation completion message to the base station controller to select mobile switching center;

The mobile switching center selected by the base station controller returns the user mobile station connection rejection message;

The subscriber mobile station sends a location update message to the base station controller.

Optionally, step A specifically includes:

The mobile station of the user sends a paging response containing the temporary mobile user identity indicated by the network resources. The base station controller determines that the mobile switching center to which the temporary mobile user Select an available mobile switching center in the switching center, and send a paging response message to it;

The mobile switching center selected by the base station controller finds that the temporary mobile user identity is not allocated by itself and the mobile switching center to which the user who originally allocated the temporary mobile user identity belongs is unavailable, then issues a temporary mobile user identity allocation message;

After receiving the temporary mobile user identity allocation message, the mobile station of the user deletes the temporary mobile user identity saved by the local machine, returns a temporary mobile user identity allocation completion message, and the base station controller forwards the temporary mobile user identity allocation completion message to the base station controller the selected mobile switching center;

The mobile switching center selected by the base station controller returns the user mobile station connection rejection message;

The subscriber mobile station sends a location update message to the base station controller.

Optionally, step A specifically includes:

The mobile station of the user sends a connectionless message containing the temporary mobile user identity indicated by the network resources. The base station controller determines that the mobile switching center to which the user belongs to the temporary mobile user identity is unavailable. Selecting an available mobile switching center in the switching center and forwarding the connectionless message to it;

The mobile switching center selected by the base station controller finds that the temporary mobile user identity is not allocated by itself and the mobile switching center to which the user who originally allocated the temporary mobile user identity belongs is unavailable, and sends a temporary mobile user identity allocation message;

After receiving the temporary mobile user identity allocation message, the mobile station of the user deletes the temporary mobile user identity saved by this machine, returns a temporary mobile user identity allocation completion message, and the base station controller forwards the temporary mobile user identity allocation completion message to the base station controller selected mobile switching center;

The mobile switching center selected by the base station controller returns a connection rejection message;

The subscriber mobile station sends a location update message to the base station controller.

Wherein, the base station controller described in step A determines that the mobile switching center to which the user belongs is unavailable in the following manner:

The base station controller establishes a handshake with the mobile switching center to which the user belongs, and determines that the mobile switching center to which the user belongs is unavailable when the handshake fails; or

The base station controller judges the link status with the mobile switching center to which the user belongs, and determines that the mobile switching center to which the user belongs is unavailable when all links fail and the signaling point of the mobile switching center is unreachable; or

The network management system notifies the base station controller that the mobile switching center to which the user belongs is unavailable.

Wherein, in the step B, the base station controller selects a mobile switching center as the mobile switching center to which the user belongs from the mobile switching centers connected to it in the following manner:

a base station controller randomly selects one of a plurality of functioning mobile switching centers to which it is connected; or

The base station controller selects the one with the lightest load from a plurality of normal working mobile switching centers connected to it.

Wherein, step C specifically includes:

The mobile switching center returns a temporary mobile user identity allocation message carrying a network resource indication to the user mobile station;

The user mobile station returns a temporary mobile user identity allocation completion message to the mobile switching center;

The mobile switching center returns a location update complete message to the subscriber mobile station.

Compared with the prior art, the present invention has the following beneficial effects:

In the present invention, by adding a TMSI allocation process on the CDMAA interface, the MSC allocates the TMSI when the user's location is updated or a service request is made, and the TMSI includes NRI to indicate the MSC to which the user belongs, and the BSC selects the MSC according to the NRI contained in the TMSI in the message, In this way, after an MSC connected to the BSC is upgraded and maintained, overloaded or crashed, other available MSCs connected to it can serve users within the coverage of the BSC.

Description of drawings

Fig. 1 is a schematic diagram of simple networking of a code division multiple access mobile communication network in the prior art;

Fig. 2 is a schematic diagram of A-Flex networking of the present invention;

Fig. 3 is the TMSI structure schematic diagram that the present invention adopts;

Fig. 4 is a schematic diagram of the processing flow of the location update method of the present invention;

Fig. 5 is the main flowchart of the method for handover of the user's home mobile switching center in the present invention;

Fig. 6 is the flow chart of the first embodiment of the switching method of the user's home mobile switching center in the present invention;

Fig. 7 is the flow chart of the second embodiment of the switching method of the user's home mobile switching center in the present invention;

FIG. 8 is a flow chart of the third embodiment of the switching method of the user's home mobile switching center in the present invention;

Fig. 9 is a flow chart of the fourth embodiment of the method for switching the user's home mobile switching center according to the present invention.

Detailed ways

The present invention is implemented based on the A-Flex mechanism. The so-called A-Flex means that if a BSC can connect to multiple MSCs at the same time, it can make other available MSCs connected to it become the BSC after an MSC device is upgraded, maintained, overloaded or crashed. User services within the scope of coverage. The A-Flex mechanism itself can make load balancing and load redistribution among multiple MSC nodes possible, and can effectively avoid the occurrence of single node overload.

The A-Flex network is shown in Figure 2, where the scope of the pool consists of the wireless coverage of multiple BSCs, and the multiple BSCs are jointly served by all MSCs (at least two) in the pool. The pool can be understood as a logical concept, which is essentially determined by the routing mechanism on the BSC. It can be seen that each BSC in the pool is connected to all MSCs in the pool, and you can choose among all MSCs arbitrarily.

In summary, the above-mentioned Flex has the following characteristics:

1.) One BSC can be connected to multiple MSCs.

2.) Under normal circumstances, the BSC determines the routing of the core network with a certain algorithm based on the user's identity, and the user does not change the MSC to which he belongs when roaming in the pool.

3.) When an MSC fails, the BSC changes the algorithm to determine a new route to an available path.

In the present invention, in order to realize A-Flex, increase TMSI distribution flow in CDMA A interface, MSC distributes TMSI when user's location is updated or service request, as shown in Figure 3, in the present invention, include Network Resource Indicator (Network Resource Indicator) in TMSI , NRI), used to indicate the MSC to which the user belongs. NRI indicates a unique core network node, which is the address information of the BSC addressing the core network node. The corresponding relationship between NRI and the core network node is uniformly configured in all BSCs in the pool . The planning of NRI length is done in one step at the initial stage of network planning, and NRI node resources can be reserved for subsequent expansion.

During the valid period of TMSI, MS carries the TMSI assigned by MSC when sending a message, and BSC selects MSC according to the NRI in TMSI. Only when MS does not carry TMSI but carries IMSI, it uses the routing algorithm based on IMSI to select MSC. In the invention, the use of TMSI in CDMAA-Flex can facilitate the routing of messages to the same MSC during the entire service process.

The location update process of allocating TMSI in the present invention will be described below with reference to FIG. 4 .

In the present invention, the mobile station MS of the CDMA terminal user supports the TMSI process. When the mobile station of the user initiates a location update, the mobile switching center responding to the location update allocates a temporary mobile station containing information indicating that the user belongs to the mobile switching center to the mobile station of the user. User identity, complete location update.

During specific implementation, after the user mobile station sends a location update message to the mobile switching center through the base station controller, the base station controller checks whether the location update message carries network resource indication information indicating that the user belongs to the mobile switching center, and if the check result If the location update message does not carry the network resource indication, the BSC can determine that this location update is the first location update of the user mobile station, and the specific processing flow is as follows:

The base station controller selects the MSC it belongs to according to the IMSI of the mobile station of the user, and sends a location update message to the MSC, and the MSC sends a TMSI allocation message to the mobile station of the user, and the TMSI allocation message includes the mobile station indicating that the user belongs to. The NRI of the switching center, the user mobile station returns a TMSI allocation completion message to the MSC, and the MSC indicated by the NRI returns a user mobile station location update completion message; if the check result is that the location update message carries the NRI, then the BSC can determine that this The secondary location update is the subsequent location update of the mobile station, and the specific processing flow is as follows:

The BSC sends a location update message to the MSC indicated by the NRI, and the MSC indicated by the NRI returns TMSI allocation indication information to the user mobile station, and the TMSI allocation message includes the NRI indicating the MSC to which the user belongs, and the user mobile station sends the message to the user mobile station The MSC returns a TMSI allocation complete message, and the MSC indicated by the NRI returns a user mobile station location update complete message.

Based on the above-mentioned location update procedure, in the present invention, when the MSC to which the user belongs is unavailable (such as failure or overload, etc.), switching of the MSC to which the user belongs can also be realized.

With reference to Fig. 5, this figure is the main flow chart of the mobile switching center handover method that the user belongs to in the present invention, specifically mainly comprises following flow process:

Step 11, the base station controller determines that the mobile switching center to which the user belongs is unavailable, and the base station controller in the present invention may specifically determine that the mobile switching center to which the user belongs is unavailable in the following manner:

The base station controller establishes a handshake with the mobile switching center to which the user belongs, and determines that the mobile switching center to which the user belongs is unavailable when the handshake fails; or

The base station controller judges the link status with the mobile switching center to which the user belongs, and determines that the mobile switching center to which the user belongs is unavailable when all links fail and the signaling point of the mobile switching center is unreachable; or

The network management O&M system notifies the base station controller that the mobile switching center to which the user belongs is unavailable.

Step 12, the user's mobile station initiates a location update.

Step 13, the base station controller selects a mobile switching center as the mobile switching center to which the user belongs from a plurality of mobile switching centers connected to it, and the base station controller in the present invention can select from the mobile switching center connected to it in the following manner Select a mobile switching center as the mobile switching center to which the user belongs:

a base station controller randomly selects one of a plurality of functioning mobile switching centers to which it is connected; or

The base station controller selects the one with the lightest load from a plurality of normal working mobile switching centers connected to it.

Step 14, the mobile switching center selected by the base station controller assigns to the mobile station of the user a temporary mobile user identity containing information indicating that the user belongs to the selected mobile switching center, and switches to the mobile switching center to which the user belongs.

The following will be described with specific embodiments.

Referring to FIG. 6 , this figure is a flow chart of the first embodiment of the switching method of the user's home mobile switching center in the present invention.

In this embodiment, after an MSC fails, the user belonging to this MSC initiates location registration, and the BSC routes the user's location registration message to a normal MSC in the pool. When the MSC receives the location registration message carrying TMSI, it judges that the current user It is necessary to re-register the location, return the TMSI and TMSI expiration time, and use the TMSI or TMSI expiration time contained in it to instruct the mobile phone to delete the current TMSI. When the mobile phone re-initiates location registration, it can register to a new MSC. The specific steps include the following steps :

Step s101, the user mobile station MS uses the TMSI containing the NRI to perform location registration, and the BSC finds that the MSC1 pointed to by the TMSI has failed, then selects an available MSC2 in the A-Flex area according to the local policy, and sends a location update request message to it ;

Step s102, MSC2 finds that the user's TMSI is not allocated by itself, then sends a TMSI allocation message, in which the TMSI carried can be set to all 1 or the TMSI expiration time can be set to the current system time;

Step s103, MS deletes the TMSI stored in the local machine after receiving the message, returns a distribution complete message, and BSC forwards the message to MSC2;

Step s104, MSC2 returns a location registration rejection message;

In step s105, the MS initiates a location registration process carrying the IMSI, and the BSC selects an MSC in the A-Flex area, such as MSC3, according to the IMSI and locally configured routing data configuration information, and sends a location update request message to it;

Step s106, MSC3 assigns a TMSI to the MS, which contains NRI information uniquely identifying the MSC3 in the A-Flex area, and the BSC sends the TMSI information to the MS through a TMSI assignment message;

Step s107, the MS saves the received TMSI, TMSI_ZONE, TMSI expiration time, etc., and returns a TMSI allocation complete message, and the BSC forwards the message to MSC3;

Step s108, MSC3 returns a location update acceptance message.

Referring to FIG. 7 , this figure is a flow chart of the second embodiment of the switching method of the user's home mobile switching center in the present invention.

In this embodiment, when an MSC fails, a user belonging to the MSC initiates a connection management CM service request, and the BSC routes the user's connection management CM service request message to a normal MSC in the pool, and the MSC receives the connection management CM service message carrying TMSI CM service request message, when it is judged that the MSC that originally allocated the TMSI is faulty, returns the TMSI and TMSI expiration time, and uses the TMSI or TMSI expiration time contained in it to instruct the mobile phone to delete the current TMSI, reject the call, and register at the user's subsequent location ( Including the implicit location registration when conducting business), it can be registered to a new MSC for processing, which mainly includes the following steps:

Step s201, the MS uses the TMSI containing the NRI to initiate a call, and the BSC finds that the MSC1 pointed to by the TMSI has failed, then selects an available MSC2 in the A-Flex area according to the local policy, and sends a CM service request message to it;

Step s202, MSC2 finds that the TMSI is not allocated by itself and MSC1 that originally allocated the TMSI has failed;

Step s203, MSC2 sends a TMSI allocation message, in which the TMSI carried can be set to all 1s or the TMSI expiration time can be set to the current system time;

Step s204, MS deletes the TMSI stored in the local machine after receiving the message, returns a TMSI allocation complete message, and the BSC forwards the message to MSC2;

In step s205, MSC2 returns a connection rejection message.

Step s206, the subsequent MS registers its location or implicitly registers its location to the new MSC3 when performing services;

After that, the user has registered the correct location to MSC3 and assigned a TMSI, and all subsequent processes can proceed smoothly.

Referring to FIG. 8 , this figure is a flow chart of the third embodiment of the switching method of the user's home mobile switching center in the present invention.

In this embodiment, after an MSC fails, the user belonging to this MSC returns a paging response message, and the BSC routes the user's paging response message to a normal MSC in the pool, and the MSC receives the paging response message carrying TMSI, When it is judged that the MSC that originally allocated the TMSI is faulty, it returns the TMSI and TMSI expiration time, and uses the TMSI or TMSI expiration time contained in it to instruct the mobile phone to delete the current TMSI, reject the call, and register at the user's subsequent location (including when doing business) (implicit location registration), it can be registered to a new MSC for processing, which mainly includes the following steps:

Step s301, the MS sends a paging response containing the TMSI of the NRI, and the BSC finds that the MSC1 pointed to by the TMSI has failed, then selects an available MSC2 in the A-Flex area according to the local policy, and sends a paging response message to it;

Step s302, MSC2 finds that the TMSI is not allocated by itself and MSC1 that originally allocated the TMSI has failed;

Step s303, MSC2 sends a TMSI allocation message, in which the TMSI carried can be set to all 1s or the TMSI expiration time can be set to the current system time;

Step s304, MS deletes the TMSI stored in the local machine after receiving the message, returns a TMSI allocation complete message, and the BSC forwards the message to MSC2;

In step s305, MSC2 returns a connection rejection message.

Step s306, the subsequent MS registers its location or implicitly registers its location to the new MSC3 when performing services;

After that, the user has registered to MSC3 at the correct location and assigned a TMSI, and all subsequent processes can proceed smoothly.

Referring to FIG. 9 , this figure is a flowchart of the fourth embodiment of the switching method of the user's home mobile switching center in the present invention.

In this embodiment, connectionless message transmission is taken as an example for illustration, which mainly includes the following steps:

Step s401, the MS sends an access channel short message containing the TMSI of the NRI, and the BSC finds that the MSC1 pointed to by the TMSI has failed, then selects an available MSC2 in the A-Flex area according to the local policy, and sends ADDS Transfer to it information;

Step s402, MSC2 finds that the TMSI is not allocated by itself and MSC1 that originally allocated the TMSI has failed;

Step s403, MSC2 sends a TMSI allocation message, in which the TMSI carried can be set to all 1s or the TMSI expiration time can be set to the current system time;

Step s404, MS deletes the TMSI stored in the local machine after receiving the message, returns a TMSI allocation complete message, and the BSC forwards the message to MSC2;

In step s405, the subsequent MS registers its location or implicitly registers its location with the new MSC3 when performing services.

It should be noted that MSC3 and MSC2 may be the same MSC in the foregoing embodiment.

To sum up, the present invention can realize the connection between one BSC and multiple MSCs, and when one MSC fails, the service will not be affected; it can also realize the resource sharing and load sharing of multiple MSCs; it improves the security of the network and optimizes the performance of the network. resource allocation.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be It is regarded as the protection scope of the present invention.

Claims (12)

1, a kind of location updating method is characterized in that, comprising:

A, user's Mobile Origination position are upgraded;

B, respond the mobile switching centre that this position upgrades and distribute to this user's travelling carriage and comprise the temporarily moved subscriber identity of indicate this user attaching mobile switching centre information, the completing place renewal.

2, location updating method according to claim 1 is characterized in that, the information of described indication user attaching mobile switching centre is the Internet resources indications.

3, location updating method according to claim 2 is characterized in that, step a specifically comprises:

A1, user's travelling carriage send location update message to base station controller;

A2, base station controller are checked the Internet resources indication information that whether carries this user attaching mobile switching centre of indication in the described location update message, if check result is for being, then the mobile switching centre to described Internet resources indication indication sends location update message, otherwise, send location update message to the mobile switching centre that the International Mobile Subscriber Identity based on the user is routed to.

4, according to claim 2 or 3 described location updating methods, it is characterized in that step b specifically comprises:

The mobile switching centre of b1, response user position update returns the temporarily moved subscriber identity assignment messages of carrying the Internet resources indication to user's travelling carriage;

B2, user's travelling carriage return the temporarily moved subscriber identity to mobile switching centre and have assigned message;

B3, mobile switching centre upgrade to user's travelling carriage home position and finish message.

5, a kind of user attaching mobile switching centre changing method is characterized in that, comprising:

A, base station controller determine that the mobile switching centre of user attaching is unavailable, and this user's Mobile Origination position is upgraded;

B, base station controller are selected the mobile switching centre of a mobile switching centre as this user attaching from a plurality of mobile switching centres of its connection;

The mobile switching centre that C, described base station controller are selected distributes to this user's travelling carriage and comprises the indication user attaching in the temporarily moved subscriber identity of mobile switching centre's information of this selection, switches to the mobile switching centre of this user attaching.

6, user attaching according to claim 5 mobile switching centre changing method is characterized in that steps A specifically comprises:

User's travelling carriage uses the temporarily moved subscriber identity that comprises the Internet resources indication to carry out location registers, base station controller determines that the mobile switching centre of the user attaching that this temporarily moved subscriber identity is pointed to is unavailable, then, send location update request message to it according to local policy optional available mobile switching centre from the mobile switching centre of its connection;

The mobile switching centre that base station controller is selected finds that this user's temporarily moved subscriber identity is not that oneself distributes, and then issues temporarily moved subscriber identity assignment messages;

User's travelling carriage is deleted local temporarily moved subscriber identity of preserving after receiving the mobile subscriber identifier assignment messages, returns and has assigned message, and base station controller forwards the message to the mobile switching centre of its selection;

The mobile switching centre that base station controller is selected is to user's travelling carriage home position registration refuse information;

User's travelling carriage sends location update message to base station controller.

7, user attaching according to claim 5 mobile switching centre changing method is characterized in that steps A specifically comprises:

User's travelling carriage uses the temporarily moved subscriber identity that comprises the Internet resources indication to begin to exhale, base station controller determines that the mobile switching centre of the user attaching that this temporarily moved subscriber identity is pointed to is unavailable, then, send connection management CM business request information to it according to local policy optional available mobile switching centre from a plurality of mobile switching centres of its connection;

The mobile switching centre that base station controller is selected finds that this temporarily moved subscriber identity is not that the mobile switching centre of own distribution and the user attaching that distributed the temporarily moved subscriber identity originally is unavailable, then issues temporarily moved subscriber identity assignment messages;

User's travelling carriage is deleted local temporarily moved subscriber identity of preserving after receiving described temporarily moved subscriber identity assignment messages, return the temporarily moved subscriber identity and assigned message, base station controller is transmitted described temporarily moved subscriber identity and has been assigned the mobile switching centre of message to the base station controller selection;

The mobile switching centre that base station controller is selected returns user's travelling carriage connection refused message;

User's travelling carriage sends location update message to base station controller.

8, user attaching according to claim 5 mobile switching centre changing method is characterized in that steps A specifically comprises:

The page response of the temporarily moved subscriber identity that contains Internet resources indications of giving out a contract for a project on user's travelling carriage, base station controller determines that the mobile switching centre of the user attaching that this temporarily moved subscriber identity is pointed to is unavailable, then, send page-response message to it according to local policy optional available mobile switching centre from a plurality of mobile switching centres of its connection;

The mobile switching centre that base station controller is selected finds that this temporarily moved subscriber identity is not that the mobile switching centre of own distribution and the user attaching that distributed the temporarily moved subscriber identity originally is unavailable, then issues temporarily moved subscriber identity assignment messages;

User's travelling carriage is deleted the temporarily moved subscriber identity that this organizational security is deposited after receiving described temporarily moved subscriber identity assignment messages, return the temporarily moved subscriber identity and assigned message, base station controller is transmitted described temporarily moved subscriber identity and has been assigned the mobile switching centre of message to the base station controller selection;

The mobile switching centre that base station controller is selected returns user's travelling carriage connection refused message;

User's travelling carriage sends location update message to base station controller.

9, user attaching according to claim 5 mobile switching centre changing method is characterized in that steps A specifically comprises:

The connectionless information of the temporarily moved subscriber identity that contains Internet resources indications of giving out a contract for a project on user's travelling carriage, base station controller determines that the mobile switching centre of the user attaching that this temporarily moved subscriber identity is pointed to is unavailable, then, transmit described connectionless information to it according to local policy optional available mobile switching centre from a plurality of mobile switching centres of its connection;

The mobile switching centre that described base station controller is selected finds that this temporarily moved subscriber identity is not that the mobile switching centre of own distribution and the user attaching that distributed the temporarily moved subscriber identity originally is unavailable, then issues temporarily moved subscriber identity assignment messages;

User's travelling carriage is deleted the temporarily moved subscriber identity that this organizational security is deposited after receiving described temporarily moved subscriber identity assignment messages, return the temporarily moved subscriber identity and assigned message, base station controller is transmitted the temporarily moved subscriber identity and has been assigned the mobile switching centre of message to the base station controller selection;

The mobile switching centre that base station controller is selected returns connection refused message;

User's travelling carriage sends location update message to base station controller.

10, according to each described user attaching mobile switching centre changing method of claim 5-9, it is characterized in that base station controller described in the steps A determines that by following manner the mobile switching centre of user attaching is unavailable:

The mobile switching centre of base station controller and user attaching sets up and shakes hands, and determines that the mobile switching centre of user attaching is unavailable when shaking hands failure; Or

Link State between the mobile switching centre of base station controller judgement and user attaching when all link failures, determines when mobile switching centre's signalling point is unreachable that the mobile switching centre of user attaching is unavailable; Or

The mobile switching centre of network management system informing base station controller user attaching is unavailable.

11, user attaching according to claim 10 mobile switching centre changing method, it is characterized in that base station controller is selected the mobile switching centre of a mobile switching centre as this user attaching in the following manner among the step B from the mobile switching centre of its connection:

Base station controller is selected one at random from the mobile switching centre of a plurality of operate as normal of its connection; Or

Base station controller selects a load the lightest from the mobile switching centre of a plurality of operate as normal of its connection.

12, user attaching according to claim 11 mobile switching centre changing method is characterized in that step C specifically comprises:

Mobile switching centre returns the temporarily moved subscriber identity assignment messages of carrying the Internet resources indication to user's travelling carriage;

User's travelling carriage returns the temporarily moved subscriber identity to mobile switching centre and has assigned message;

Mobile switching centre upgrades to user's travelling carriage home position and finishes message.

Images