CN101321379A - Method, system and device for determining routing in CDMA A-Flex network - Google Patents

Abstract

The invention provides a method and system for determining routing in a CDMA A-Flex network. The method includes: after the message distribution device receives the initial layer 3 message initiated by the user, selects a CN node according to the IMSI carried in the message and the corresponding relationship between the IMSI and the CN node stored in the data backup center, and routes the message to the Selected CN node. In addition, the invention also provides a data backup center and message distribution equipment. Utilizing the technical solution provided by the invention can reduce inter-office location updates.

Description

Method, system and device for determining routing in CDMA A-Flex network

technical field

The present invention relates to mobile communication technology, in particular to a method, system and device for determining routing in a Code Division Multiple Access (CDMA, Code Division Multiple Access) flexible A interface (A-Flex) network.

Background technique

In the traditional CDMA network architecture, a mobile switching center (MSC, Mobile SwitchCenter) can be connected to multiple base station controllers (BSC, Base Station Control), and a BSC can only be connected to one MSC. Fig. 1 shows a schematic diagram of the connection relationship between MSC and BSC under the traditional CDMA network architecture. This 1:N connection relationship between MSC and BSC restricts the flexibility of networking. For example, if an MSC shuts down for upgrade and maintenance or fails, all BSCs connected to the MSC will lose their function, and all users within the coverage of these BSCs will be unable to communicate with circuit services.

In order to solve the above problems, A-Flex networking mode is introduced in CDMA. Figure 2 shows a schematic diagram of the connection relationship between MSC and BSC under the CDMA A-Flex network architecture. In Figure 2, not only one MSC can be connected to multiple BSCs, but also one BSC can be connected to multiple MSCs. These MSCs form an MSC pool for the BSC, and the user does not need to change the serving MSC when moving in the pool area. In the existing CDMA A-Flex technology, for the initial layer 3 message initiated by the user, such as service request message, location update request message, paging response message, etc., it is generally based on the user's International Mobile Station Identity (IMSI, International Mobile Station Identity) to select the route. The specific operation process is as follows: configure the corresponding relationship between IMSI and MSC on the BSC. After receiving the initial layer 3 message initiated by the user, the BSC selects the corresponding MSC to distribute the message according to the IMSI carried in it and the configured corresponding relationship.

For example, the operation management system (O&M) can configure the routing information shown in Table 1 on each BSC in the pool. After the BSC receives the initial layer 3 message initiated by the mobile station (MS, Mobile Station), it extracts the IMSI from it, calculates the value of IMSI/10mod 1000, and then looks up Table 1 according to the value to determine the destination MSC of the message.

IMSI/10mod 1000 MSC logo 000 MSC1 001 MSC2 002 MSC3 ... ... 123 MSC1 ... ... 999 MSC3

Table 1

For load redistribution or load migration, it can be realized by modifying the routing information configured on the BSC. For example, when it is necessary to migrate users corresponding to the IMSI/10mod 1000=123 range on MSC 1 to MSC 2 due to heavy load or other reasons, the routing information configured on all BSCs in the pool can be synchronously modified as shown in Table 2. displayed form. Afterwards, no matter which BSC in the pool the user corresponding to the number range of IMSI/10mod 1000=123 initiates the initial layer 3 message, the message will be routed to MSC2.

IMSI/10mod 1000 MSC logo 000 MSC1 001 MSC2 002 MSC3 ... ... 123 MSC2 ... ... 999 MSC3

Table 2

In addition to synchronously modifying the routing information on all BSCs in the pool in the case of load redistribution or load migration, each BSC in the pool area can also modify its saved routing information in real time according to changes in the network status. For example, if BSC1 finds that the link between itself and MSC3 fails, BSC1 can migrate users on MSC3 to other reachable MSCs in the pool, such as MSC1, and route the routing information saved by BSC1 to the IMSI number segment of MSC3 The user's route is changed to MSC1. At this time, if the MS in the IMSI number segment corresponding to the original MSC3, such as MS1, initiates an initial layer 3 message to BSC1, then BSC1 will route the initial layer 3 message to MSC1 by checking the routing information. However, since the routing information in other BSCs does not change at this time, when MS1 roams to other BSCs in the pool, other BSCs will still route MS1's message to MSC3. At this point, the MSC3 needs to go to the Home Location Register (HLR, HomeLocation Register) to perform an inter-office location update.

It can be seen that the method of determining the route in the existing CDMA A-Flex network is likely to cause changes in the user's service MSC, resulting in an increase in the number of inter-office location updates of users roaming in the pool area.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method, system and device for determining routing in a CDMA A-Flex network, reducing inter-office location updates.

In order to achieve the above purpose, the method for determining the route provided by the embodiment of the present invention is as follows:

After receiving the initial layer 3 message initiated by the user, the message distribution device selects a CN node according to the IMSI carried in the message and the corresponding relationship between the IMSI and the CN node stored in the data backup center, and routes the message to the selected CN node .

The system for determining routing in the CDMA A-Flex network provided by the embodiments of the present invention includes: a data backup center, at least one message distribution device and at least one CN node, wherein,

Data backup center, used to save the corresponding relationship between user IMSI and CN node;

The message distribution device is used to receive the initial layer 3 message initiated by the user, select a CN node according to the IMSI carried in the message and the corresponding relationship between the IMSI and the CN node stored in the data backup center, and route the message to the selected CN node.

In addition, an embodiment of the present invention also provides a data backup center, including: a data storage unit and a node determination unit, wherein,

The data storage unit is used to store the corresponding relationship between the user IMSI and the CN node;

The node determination unit is used to receive the IMSI information from the message distribution device, select a CN node according to the received IMSI information and the corresponding relationship between the IMSI and the CN node stored in the data storage unit, and return the selected CN node information to Message distribution device.

The embodiment of the present invention also provides a message distribution device, including: a message receiving unit and a message distribution unit, wherein,

a message receiving unit, configured to receive an initial layer 3 message initiated by a user, and forward the received initial layer 3 message to the message distribution unit;

The message distribution unit is configured to send the IMSI information carried in the received initial layer 3 message to the data backup center, and receive the CN node information returned by the data backup center, and route the received initial layer 3 message to the CN node .

It can be seen that, in the embodiment of the present invention, after receiving the initial layer 3 message initiated by the user, all the message distribution devices in the pool determine the route of the user message according to the information stored in the data backup center, rather than according to their own The saved information is used to determine the routing of user messages. In this way, the change of the user serving CN node due to the inconsistency of the routing information maintained by each message distribution device in the prior art is avoided, and the inter-office location update is reduced.

Description of drawings

FIG. 1 is a schematic diagram of a connection relationship between an MSC and a BSC under a traditional CDMA network architecture in the prior art.

Figure 2 is a schematic diagram of the connection relationship between MSC and BSC under the CDMA A-Flex network architecture in the prior art.

Fig. 3 is the CDMA A-Flex network architecture schematic diagram that increases data backup center in the embodiment of the present invention.

Fig. 4 is a flowchart of a method for determining a route in an embodiment of the present invention.

FIG. 5 is a schematic diagram of another CDMA A-Flex network architecture in which a data backup center is added in an embodiment of the present invention.

FIG. 6 is a schematic structural diagram of a system for determining routes in an embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a data backup center and a message distribution device in an embodiment of the present invention.

FIG. 8 is a schematic structural diagram of a node determining unit in an embodiment of the present invention.

Fig. 9 is a schematic diagram of the CDMA A-Flex network architecture using the active and standby data backup centers in the embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

It can be seen from the description of the background technology that in the existing CDMA A-Flex network, the method of determining the message route according to the routing information configured on the BSC may easily cause changes in the user service MSC, resulting in an increase in the number of inter-office location updates.

In order to overcome the above problems, the embodiment of the present invention provides a method for determining routing in a CDMA A-Flex network, including: setting up a data backup center, storing the corresponding relationship between the user IMSI and the MSC in the data backup center; After receiving the initial layer 3 message, an MSC is selected according to the IMSI carried in the message and the corresponding relationship between the IMSI and the MSC stored in the data backup center, and then the BSC routes the received initial layer 3 message to the selected MSC.

That is to say, the corresponding relationship between the IMSI and the MSC is not saved on the BSC, but the corresponding relationship between the IMSI and the MSC is saved in the added data backup center. After receiving the initial layer 3 message initiated by the user, all BSCs in the pool determine the route of the user message according to the information stored in the data backup center. Therefore, the situation in the prior art that the user serving MSC is changed due to the inconsistency of the routing information maintained by each BSC is avoided, and the inter-office location update is reduced.

Wherein, the data backup center can be an independent physical device, or a functional component in the MSC. In addition to backing up the corresponding relationship between the user's IMSI and the MSC, the data backup center can also be used to back up information such as the user's location area identifier (LAI) and power-on/off status. Moreover, the data backup center is fully interconnected with the MSC. When the user data in the MSC changes, the MSC needs to notify the data backup center to update the stored information. For example, when a new user in MSC is successfully registered or a user is deleted, MSC will notify the data backup center of the successfully registered or deleted user information; after the data backup center receives it, it will save the IMSI of the successfully registered user and the information to which the user belongs. MSC correspondence, or delete the correspondence between the IMSI of the deleted user and the user's home MSC. In addition, the MSC can also notify the data backup center of the change information of the user's LAI and the user's power-off information, and the data backup center will update the corresponding data after receiving it.

In order to save storage resources, the data backup center can also set a timer for each user data. If no operation is performed on the user data corresponding to the timer within a certain timer protection time, then the user data is deleted after the timer expires.

Figure 3 shows a schematic diagram of the CDMA A-Flex network architecture in which a data backup center is added in an embodiment of the present invention. The route determination method in the embodiment of the present invention will be described in detail below with reference to FIG. 3 . The process flow of the method is shown in Figure 4, and mainly includes the following steps:

Step 401: MS initiates an initial layer 3 message to BSC.

Step 402: After receiving the initial layer 3 message initiated by the MS, the BSC sends the IMSI information carried in the message to the data backup center.

Step 403: The data backup center selects an MSC according to the received IMSI information and the corresponding relationship between the IMSI and the MSC stored by itself, and returns the selected MSC information to the BSC.

Step 404: After receiving the MSC information returned by the data backup center, the BSC routes the received initial layer 3 information to the MSC.

Wherein, the specific process of step 403 includes:

After the data backup center receives the IMSI information sent by the BSC, it can determine whether there is an MSC corresponding to the received IMSI by searching the corresponding relationship between the IMSI and the MSC stored by itself. If there is a corresponding MSC, and the signaling of the MSC If the point is reachable, the data backup center will return the MSC information to the BSC; if there is a corresponding MSC, but the signaling point of the MSC is not reachable, or it is judged that there is no corresponding MSC, the data backup center will select a signaling point from the pool. The MSC that is reachable sends the selected MSC information to the BSC, and saves the corresponding relationship between the received IMSI and the selected MSC. Afterwards, the data backup center selects a route according to the latest stored correspondence.

Among them, the strategies for the data backup center to select an MSC with reachable signaling point from the pool include but are not limited to the following: select an MSC with reachable signaling point from the pool according to the round-robin principle; Or, select an MSC with the lightest load and reachable signaling point from the pool, and so on.

The above-mentioned routing determination methods are all described for the CDMA A-Flex network architecture integrating bearer and control. It should be noted that the present invention is also applicable to the CDMA A-Flex network architecture in which bearer and control are separated. Among them, the separation of bearer and control means that the MSC adopts a softswitch architecture, including two parts: the mobile switching center server (MSC Server) and the media gateway (MGW). In the CDMA A-Flex network architecture where the bearer and control are separated, the A-Flex function can be implemented on the BSC or the MGW.

The difference from Figure 3 is that in the CDMA A-Flex network architecture where bearer and control are separated, the data backup center stores the corresponding relationship between IMSI and MSC Server. If the A-Flex function is implemented on the BSC, the entire implementation process of determining the route is basically the same as that shown in Figure 4. The difference is that after the data backup center receives the IMSI information sent by the BSC, it saves The corresponding relationship between the IMSI and the MSC Server selects an MSC Server, and returns the selected MSC Server information to the BSC; after receiving the MSC Server information returned by the data backup center, the BSC routes the received initial layer 3 information to the MSC Server. Refer to Figure 5 for another schematic diagram of the CDMA A-Flex network architecture after adding a data backup center. If the A-Flex function is implemented on the MGW, the action of querying the data backup center for the MSCServer information of the user is completed by the MGW Yes, the data backup center needs to return the selected MSC Server information to the MGW, and then the MGW routes the user's initial layer 3 message to the MSC Server returned by the data backup center. Wherein, the process of how the data backup center selects the MSC Server is consistent with step 403, and will not be repeated here.

In this paper, for the convenience of description, BSC and MGW can be collectively referred to as message distribution equipment; MSC and MSC Server can be collectively referred to as core network (CN, Core Network) nodes.

Correspondingly, the embodiment of the present invention also provides a system for determining routing in a CDMA A-Flex network. Referring to Figure 6, the system structure mainly includes: a data backup center, at least one message distribution device and at least one CN node. in,

Data backup center, used to save the corresponding relationship between user IMSI and CN node;

The message distribution device is used to receive the initial layer 3 message initiated by the user, select a CN node according to the IMSI carried in the message and the corresponding relationship between the IMSI and the CN node stored in the data backup center, and route the message to the selected CN node.

Referring to Fig. 7, the data backup center may specifically include: a data storage unit and a node determination unit; the message distribution device may specifically include: a message receiving unit and a message distribution unit. in,

The data storage unit is used to store the corresponding relationship between the user IMSI and the CN node;

The node determination unit is used to receive the IMSI information from the message distribution device, select a CN node according to the received IMSI information and the corresponding relationship between the IMSI and the CN node stored in the data storage unit, and return the selected CN node information to Message distribution equipment;

a message receiving unit, configured to receive an initial layer 3 message initiated by a user, and forward the received initial layer 3 message to the message distribution unit;

The message distribution unit is configured to send the IMSI information carried in the received initial layer 3 message to the data backup center, and receive the CN node information returned by the data backup center, and route the received initial layer 3 message to the CN node .

Referring to Fig. 8, the node determining unit may include: an information transceiving unit and a node selecting unit. Among them, the information sending and receiving unit is used to receive the IMSI information from the message distribution device, forward the received IMSI information to the node selection unit, and receive the CN node information returned by the node selection unit, and send the received CN node information to the message distribution equipment;

The node selection unit is used to judge whether there is a CN node corresponding to the received IMSI by searching the corresponding relationship between the IMSI and the CN node stored in the data storage unit, if there is a corresponding CN node and the signaling point of the CN node is reachable , then return the CN node information to the information sending and receiving unit; if there is a corresponding CN node but the signaling point of the CN node is not reachable, or it is judged that there is no corresponding CN node, then select a signaling point from the pool to be reachable The selected CN node returns the selected CN node information to the information sending and receiving unit, and saves the corresponding relationship between the received IMSI and the selected CN node in the data saving unit.

Wherein, the CN node can be further used to notify the data backup center of information about successful user registration or user deletion; the data backup center can further include: a data update unit, which is used to update the data in the data storage unit after receiving the notification from the CN node. Saved user data is updated.

The data update unit can also be further used to set a timer for each user data stored in the data storage unit, if no operation is performed on the user data corresponding to the timer within the timer protection time, then when the timer expires Then delete the user data stored in the data storage unit.

Wherein, the data backup center may be an independent physical device, or a functional component in the CN node. When the CDMA A-Flex network adopts a network architecture that integrates bearer and control, the CN node is an MSC, and the message distribution device is a BSC; when the CDMA A-Flex network adopts a network architecture that separates bearer and control, the CN node is an MSC Server, and the message The distribution equipment is BSC or MGW.

It should be noted that although only one data backup center is shown in FIG. 3 , FIG. 5 and FIG. 6 , in practical applications, more than one data backup center can be set according to actual needs. Multiple data backup centers can work in either active/standby mode or mutual aid mode. Figure 9 is a schematic diagram of a CDMA A-Flex network architecture that uses an active/standby data backup center, and the data in the active/standby data backup center needs to be kept in sync.

It can be seen that in the embodiment of the present invention, all message distribution devices in the pool determine the route of user messages according to the information stored in the data backup center, which can avoid the inconsistency of routing information maintained by each message distribution device in the prior art. As a result, the CN node serving the user changes, thereby reducing inter-office location updates.

The purpose, technical solutions and beneficial effects of the present invention have been further described in detail above. It should be understood that the above description is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. shall be included in the protection scope of the present invention.

Claims (19)

1, determine the method for route in a kind of CDMA A-Flex network, it is characterized in that, comprising:

After the message discharge device is received Client-initiated initiation layer 3 message, corresponding relation according to IMSI that preserves in the heart in International Mobile Subscriber Identity IMSI that carries in the message and the data backup and core net CN node is selected a CN node, and this message is routed to selecteed CN node.

2, method according to claim 1 is characterized in that, described message discharge device selects the process of a CN node to comprise according to the corresponding relation of IMSI that preserves in IMSI that carries in the message and the data backup and CN node in the heart:

The message discharge device sends to the data backup center with entrained IMSI information in initiation layer 3 message of receiving;

After the IMSI information that the message discharge device sends is received at the data backup center,, and selecteed CN nodal information returned to the message discharge device according to the IMSI information of receiving and the IMSI that self preserves CN node of corresponding relation selection with the CN node.

3, method according to claim 2, it is characterized in that, described data backup center is according to the IMSI information received and the IMSI that self preserves CN node of corresponding relation selection with the CN node, and selecteed CN nodal information is returned to the message discharge device comprises:

The data backup center judges whether to exist the CN node corresponding with the IMSI that receives by searching the IMSI that self preserves with the corresponding relation of CN node, and when the signalling point of judging the corresponding CN node of existence and this CN node can reach, this CN nodal information is sent to the message discharge device.

4, method according to claim 2, it is characterized in that, described data backup center is according to the IMSI information received and the IMSI that self preserves CN node of corresponding relation selection with the CN node, and selecteed CN nodal information is returned to the message discharge device comprises:

The data backup center judges whether to exist the CN node corresponding with the IMSI that receives by searching the IMSI that self preserves with the corresponding relation of CN node, and there is corresponding CN node but the signalling point of this CN node is unreachable judging, perhaps judge when not having corresponding CN node, in the pond, select the CN node that signalling point can reach, should send to the message discharge device by selecteed CN nodal information, and preserve the corresponding relation of the described IMSI that receives and this selecteed CN node.

5, method according to claim 4 is characterized in that, the described CN node of selecting a signalling point to reach in the pond comprises:

In the pond, select the CN node that signalling point can reach according to the polling principle;

Perhaps, the CN node of selecting a signalling point to reach at random in the pond;

Perhaps, in the pond, select the CN node that the signalling point that load is the lightest can reach.

6, according to each described method of claim 1 to 5, it is characterized in that, this method further comprises: the information notification data backup center that the CN node will have user registration success or have the user to delete, data backup center upgrade the user data of self preserving after receiving the notice of CN node.

7, method according to claim 1; it is characterized in that; this method further comprises: the data backup center is respectively each user data timer is set; if in the timer guard time; this timer corresponding user data is not carried out any operation, then this user data of deletion behind timer expiry.

8, determine the system of route in a kind of CDMA A-Flex network, it is characterized in that, comprising: data backup center, at least one message discharge device and at least one CN node, wherein,

The data backup center is used to preserve the corresponding relation of user IMSI and CN node;

The message discharge device is used to receive Client-initiated initiation layer 3 message, selects a CN node according to the corresponding relation of IMSI that preserves in IMSI that carries in the message and the data backup and CN node in the heart, and this message is routed to selecteed CN node.

9, system according to claim 8 is characterized in that, described data backup center comprises: data are preserved unit and node determining unit, wherein,

Data are preserved the unit, are used to preserve the corresponding relation of user IMSI and CN node;

The node determining unit, be used to receive IMSI information from the message discharge device, select a CN node according to the IMSI that preserves in IMSI information of receiving and the data preservation unit and the corresponding relation of CN node, and selecteed CN nodal information is returned to the message discharge device;

Described message discharge device comprises: message sink unit and message Dispatching Unit, wherein,

The message sink unit is used to receive Client-initiated initiation layer 3 message, and gives the message Dispatching Unit with initiation layer 3 forwards of receiving;

The message Dispatching Unit, the entrained IMSI information of initiation layer 3 message that is used for receiving sends to the data backup center, and the CN nodal information that returns of backup reception data center, and initiation layer 3 message of receiving are routed to this CN node.

10, system according to claim 9 is characterized in that, described node determining unit comprises: information transmit-receive unit and node selected cell, wherein,

The information transmit-receive unit is used to receive the IMSI information from the message discharge device, and the IMSI information of receiving is transmitted to the node selected cell, and the CN nodal information that returns of receiving node selected cell, and the CN nodal information of receiving is sent to the message discharge device;

The node selected cell, be used for judging whether to exist the CN node corresponding with the corresponding relation of CN node with the IMSI that receives by searching the IMSI that preserves data preservation unit, and when the signalling point of judging the corresponding CN node of existence and this CN node can reach, this CN nodal information is returned to the information transmit-receive unit.

11, system according to claim 9 is characterized in that, described node determining unit comprises: information transmit-receive unit and node selected cell, wherein,

The information transmit-receive unit is used to receive the IMSI information from the message discharge device, and the IMSI information of receiving is transmitted to the node selected cell, and the CN nodal information that returns of receiving node selected cell, and the CN nodal information of receiving is sent to the message discharge device;

The node selected cell, be used for judging whether to exist the CN node corresponding with the corresponding relation of CN node with the IMSI that receives by searching the IMSI that preserves data preservation unit, and there is corresponding CN node but the signalling point of this CN node is unreachable judging, perhaps judge when not having corresponding CN node, in the pond, select the CN node that signalling point can reach, should return to the information transmit-receive unit by selecteed CN nodal information, and preserve the corresponding relation of preserving the described IMSI that receives and this selecteed CN node in the unit in data.

According to Claim 8 to 11 each described systems, it is characterized in that 12, described CN node is further used for the information notification data backup center that will user registration success be arranged or have the user to delete;

Described data backup center further comprises: data updating unit is used for after the notice of receiving the CN node data being preserved the user data of preserving the unit and upgrades.

13, system according to claim 12; it is characterized in that; described data updating unit is further used for being respectively each user data of preserving in the data preservation unit timer is set; if in the timer guard time; this timer corresponding user data is not carried out any operation, and then deleted data is preserved this user data of preserving in the unit behind timer expiry.

14, a kind of data backup center is characterized in that, comprising: data are preserved unit and node determining unit, wherein,

Data are preserved the unit, are used to preserve the corresponding relation of user IMSI and CN node;

The node determining unit, be used to receive IMSI information from the message discharge device, select a CN node according to the IMSI that preserves in IMSI information of receiving and the data preservation unit and the corresponding relation of CN node, and selecteed CN nodal information is returned to the message discharge device.

15, data backup according to claim 14 center is characterized in that described node determining unit comprises: information transmit-receive unit and node selected cell, wherein,

The information transmit-receive unit is used to receive the IMSI information from the message discharge device, and the IMSI information of receiving is transmitted to the node selected cell, and the CN nodal information that returns of receiving node selected cell, and the CN nodal information of receiving is sent to the message discharge device;

The node selected cell, be used for judging whether to exist the CN node corresponding with the corresponding relation of CN node with the IMSI that receives by searching the IMSI that preserves data preservation unit, and when the signalling point of judging the corresponding CN node of existence and this CN node can reach, this CN nodal information is returned to the information transmit-receive unit.

16, data backup according to claim 14 center is characterized in that described node determining unit comprises: information transmit-receive unit and node selected cell, wherein,

The information transmit-receive unit is used to receive the IMSI information from the message discharge device, and the IMSI information of receiving is transmitted to the node selected cell, and the CN nodal information that returns of receiving node selected cell, and the CN nodal information of receiving is sent to the message discharge device;

The node selected cell, be used for judging whether to exist the CN node corresponding with the corresponding relation of CN node with the IMSI that receives by searching the IMSI that preserves data preservation unit, and there is corresponding CN node but the signalling point of this CN node is unreachable judging, perhaps judge when not having corresponding CN node, in the pond, select the CN node that signalling point can reach, should return to the information transmit-receive unit by selecteed CN nodal information, and preserve the corresponding relation of preserving the described IMSI that receives and this selecteed CN node in the unit in data.

17, according to each described data backup center of claim 14 to 16, it is characterized in that, this data backup center further comprises: data updating unit, be used for after receiving that the CN node has user registration success or the information that the user deletes is arranged, data being preserved the user data of preserving in the unit upgrading.

18, data backup according to claim 17 center; it is characterized in that; described data updating unit is further used for being respectively each user data of preserving in the data preservation unit timer is set; if in the timer guard time; this timer corresponding user data is not carried out any operation, and then deleted data is preserved this user data of preserving in the unit behind timer expiry.

19, a kind of message discharge device is characterized in that, comprising: message sink unit and message Dispatching Unit, wherein,

The message sink unit is used to receive Client-initiated initiation layer 3 message, and gives the message Dispatching Unit with initiation layer 3 forwards of receiving;

The message Dispatching Unit, the entrained IMSI information of initiation layer 3 message that is used for receiving sends to the data backup center, and the CN nodal information that returns of backup reception data center, and initiation layer 3 message of receiving are routed to this CN node.

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