CN101321379A

CN101321379A - Method, system and device for confirming routing in CDMA A-Flex network

Info

Publication number: CN101321379A
Application number: CNA2007101109232A
Authority: CN
Inventors: 叶思海; 惠涛; 陈友军
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-06-08
Filing date: 2007-06-08
Publication date: 2008-12-10
Also published as: WO2008151554A1

Abstract

This invention provides a method and system fir determining route in CDMA A-Flex network. The method comprises: when an information distribution device receives the information of the initiated layer 3 initiated by user, selecting a CN node based on IMSI taken in the information and the corresponding relationship of IMSI and CN node stored in a data backup center, and routing the information to the selected CN node. In addition, this invention further provides a data backup center and an information distribution device. The position update in parts can be reduced through the technical proposal provided by this invention.

Description

Determine the method, system and device of route in the CDMA A-Flex network

Technical field

The present invention relates to mobile communication technology, relate in particular to the method, system and device of determining route in flexible A interface (A-Flex) network of code division multiple access (CDMA, Code DivisionMultiple Access).

Background technology

In traditional cdma network framework, a mobile switching centre (MSC, Mobile SwitchCenter) can connect a plurality of base station controllers (BSC, Base Station Control), and a BSC can only connect a MSC.Fig. 1 shows the annexation schematic diagram of MSC and BSC under the traditional C DMA network architecture.The annexation of 1:N has restricted the flexibility of networking between this MSC and the BSC.Such as, if shutting down, a MSC carries out the upgrade maintenance or the machine of delaying that breaks down, and so, all BSC that this MSC hangs down are with ineffective, and all users in these BSC institute coverages can't carry out Circuit Service communication.

In order to address the above problem, introduced the A-Flex networking mode among the CDMA.Fig. 2 shows the annexation schematic diagram of MSC and BSC under the CDMA A-Flex network architecture.In Fig. 2, not only a MSC can connect a plurality of BSC, and a BSC also can connect a plurality of MSC, and these MSC have constituted a MSC pond to this BSC, and the user need not change service MSC when mobile in the district of pond.In existing C DMA A-Flex technology, for Client-initiated initiation layer 3 message, as business request information, location update request message, page-response message etc., the International Mobile Subscriber Identity (IMSI, International Mobile Station Identity) that generally is based on the user is selected route.Its specific operation process is as follows: the corresponding relation of configuration IMSI and MSC on BSC, and after BSC receives Client-initiated initiation layer 3 message, select corresponding M SC to carry out the message distribution according to the IMSI that wherein carries and institute's configured corresponding relation.

Such as, Operational Management System (O﹠amp; M) routing iinformation shown in the allocation list 1 all on can each BSC in the pond.BSC therefrom extracts IMSI after receiving initiation layer 3 message of travelling carriage (MS, Mobile Station) initiation, calculates the value of IMSI/10mod 1000, determines the purpose MSC of this message then according to this value look-up table 1.

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

Table 1

Heavily distribute or the situation of load migration for load, can realize by revising the routing iinformation that BSC goes up configuration.Such as, when or other reason heavier owing to load, in the time of the user of corresponding this number of IMSI/10mod 1000=123 section on the MSC 1 need being moved on the MSC2, the routing iinformation that all BSC in the pond can be gone up configuration be revised as the form shown in the table 2 synchronously.Afterwards, the user of corresponding this number of IMSI/10mod 1000=123 section no matter which BSC from the pond initiates initiation layer 3 message, and this message all can be routed on the MSC2.

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

Table 2

Except above-mentioned load heavily distribute or the load migration situation under, revise in the pond outside the routing iinformation on all BSC the routing iinformation that each BSC in the district of pond also can self be preserved according to the modifications of network state in real time synchronously.Such as, if BSC1 finds the link that self is connected with MSC3 and breaks down, then BSC1 can be moved to the user on the MSC3 in the pond on other MSC such as MSC1 that can reach, and the route that is about to route in the routing iinformation that BSC1 will preserve and is the IMSI section user of MSC3 is revised as MSC1.At this moment, if the MS of 3 corresponding IMSI sections of Anchor MSC such as MS1 initiate initiation layer 3 message to BSC1, so, these initiation layer 3 message can be routed on the MSC1 by checking routing iinformation BSC1.But because this moment, the routing iinformation among other BSC did not change, therefore, when other BSC went up in MS1 roams into the pond, other BSC still can be routed to the message of MS1 on the MSC3.At this moment, MSC3 just needs to upgrade to position between attaching position register (HLR, HomeLocation Register) executive board.

As seen, the variation that the method for definite route causes the user to serve MSC easily in the existing CDMA A-Flex network causes roaming in the increase of the interoffice position update times of the user in the district of pond.

Summary of the invention

In view of this, main purpose of the present invention is to provide the method, system and device of determining route in a kind of CDMA A-Flex network, reduces the interoffice position and upgrades.

For achieving the above object, the method for definite route that the embodiment of the invention provides is as follows:

After the message discharge device is received Client-initiated initiation layer 3 message, select 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.

The system that determines route in the CDMA A-Flex network that the embodiment of the invention provides comprises: 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.

In addition, the embodiment of the invention also provides a kind of data backup center, 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.

The embodiment of the invention also provides a kind of message discharge device, 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.

This shows, in embodiments of the present invention, all message discharge devices in the pond are after receiving Client-initiated initiation layer 3 message, all be the route of determining user message in the heart according to the information of being preserved in the data backup, rather than carry out determining of user message route according to the information of self preserving.Thereby avoided the inconsistent user who causes of routing iinformation who is safeguarded owing to each message discharge device in the prior art to serve the situation generation that the CN node changes, reduced the interoffice position and upgraded.

Description of drawings

Fig. 1 is the annexation schematic diagram of MSC and BSC under the traditional C DMA network architecture in the prior art.

Fig. 2 is the annexation schematic diagram of 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 the data backup center in the embodiment of the invention.

Fig. 4 is a method flow diagram of determining route in the embodiment of the invention.

Fig. 5 is another CDMA A-Flex network architecture schematic diagram that increases the data backup center in the embodiment of the invention.

Fig. 6 is a system configuration schematic diagram of determining route in the embodiment of the invention.

Fig. 7 is the structural representation of data backup center and message discharge device in the embodiment of the invention.

Fig. 8 is the structural representation of node determining unit in the embodiment of the invention.

Fig. 9 is the CDMA A-Flex network architecture schematic diagram that adopts the master/slave data backup center in the embodiment of the invention.

Embodiment

For making purpose of the present invention, technical scheme and advantage clearer, the embodiment that develops simultaneously with reference to the accompanying drawings is described in further detail the present invention.

Described as seen by background technology, go up the method that the routing iinformation that disposes is determined the message route according to BSC in the existing CDMA A-Flex network, the variation that causes the user to serve MSC easily causes increasing of user's interoffice position update times.

In order to overcome the problems referred to above, the embodiment of the invention provides the method for determining route in a kind of CDMA A-Flex network, comprising: the data backup center is set, preserves the corresponding relation of user IMSI and MSC in the heart in data backup; After BSC receives Client-initiated initiation layer 3 message, select a MSC according to the corresponding relation of IMSI that preserves in IMSI that carries in the message and the data backup and MSC in the heart, BSC is routed to selecteed MSC with initiation layer 3 message of receiving then.

That is to say, on BSC, do not preserve the corresponding relation of IMSI and MSC, but in the data backup that increases, preserve the corresponding relation of IMSI and MSC in the heart.After all BSC in the pond receive Client-initiated initiation layer 3 message, all be the route of determining user message in the heart according to the information of being preserved in the data backup.Thereby avoided in the prior art taking place, reduced the interoffice position and upgraded owing to the routing iinformation that each BSC the safeguarded inconsistent user who causes serves the situation that MSC changes.

Wherein, described data backup center both can be a physical equipment independently, also can be a functional part among the MSC.Except the corresponding relation of backup user IMSI and MSC, the data backup center can also be used to back up information such as user's Location Area Identification (LAI) and on-off state.And data backup center and MSC are interconnected entirely, and when the user data among the MSC changed, MSC needed the notification data backup center that the information of its preservation is upgraded.Such as, when new user registration success being arranged among the MSC or have the user to delete, MSC will succeed in registration or deleted user profile is informed the data backup center; After receive at the data backup center, preserve the user's succeed in registration IMSI and the corresponding relation of MSC that this user belongs to, perhaps delete described deleted user's IMSI and the corresponding relation of this user attaching MSC.In addition, information that MSC can also change user LAI and subscriber switch machine information notification data backup center, back renewal corresponding data is received at the data backup center.

In order to save storage resources, the data backup center can also be provided with a timer respectively for each user data.If in certain timer guard time,, so, then behind this timer expiry, delete this user data not to carrying out any operation with the pairing user data of this timer.

Figure 3 shows that the CDMA A-Flex network architecture schematic diagram that increases the data backup center in the embodiment of the invention.Below in conjunction with Fig. 3 the route in the embodiment of the invention is determined that method is elaborated.This method flow mainly may further comprise the steps referring to shown in Figure 4:

Step 401:MS initiates initiation layer 3 message to BSC.

Step 402:BSC sends to the data backup center with IMSI information entrained in this message after receiving initiation layer 3 message of MS initiation.

Step 403: a MSC is selected according to the corresponding relation of the IMSI information of receiving and IMSI that self preserves and MSC in the data backup center, and selecteed MSC information is returned to BSC.

After step 404:BSC receives the MSC information of returning at the data backup center, give this MSC with the initiation layer 3 information routes of receiving.

Wherein, the detailed process of step 403 comprises:

After the IMSI information that BSC sends is received at the data backup center, by searching the IMSI that self preserves and the corresponding relation of MSC, judge whether to exist the MSC corresponding with the IMSI that receives, if there is corresponding MSC, and the signalling point of this MSC can reach, and the data backup center then returns to BSC with this MSC information; If there is corresponding MSC, but the signalling point of this MSC is unreachable, perhaps judge and do not have corresponding MSC, the MSC that signalling point can reach is then selected in the data backup center in the pond, should selecteed MSC information send to BSC, and preserve the corresponding relation of the described IMSI that receives and this selecteed MSC.Afterwards, the selection of route is carried out at the data backup center according to the corresponding relation of up-to-date preservation.

Wherein, the data backup center selects in the pond strategy of the MSC that a signalling point can reach to include but not limited to following several: select the MSC that signalling point can reach according to the polling principle in the pond; Perhaps, the MSC that selects a signalling point to reach at random in the pond; Perhaps, in the pond, select MSC that the signalling point that load is the lightest can reach or the like.

Above-described route determines that method all is to set forth at the carrying and the CDMA A-Flex network architecture of control one.Need to prove that the present invention is equally applicable to carry and controls the CDMA A-Flex network architecture of separating.Wherein, carrying separates with control and to be meant that MSC adopts soft-exchange construction, comprises Mobile Switching Center Server (MSC Server) and media gateway (MGW) two parts.In the CDMA A-Flex network architecture that carrying separates with control, the A-Flex function both can realize on BSC, also can realize on MGW.

Different is with Fig. 3, and in the CDMA A-Flex network architecture that carrying separates with control, what preserve in the heart in the data backup is the corresponding relation of IMSI and MSC Server.If the A-Flex function realizes on BSC, the then implementation procedure of whole definite route and Fig. 4 basically identical, difference is: after the IMSI information that BSC sends is received at the data backup center, corresponding relation according to the IMSI information of receiving and IMSI that self preserves and MSC Server is selected a MSC Server, and selecteed MSC Server information is returned to BSC; After BSC receives the MSC Server information of returning at the data backup center, give this MSC Server with the initiation layer 3 information routes of receiving.Referring to the CDMA A-Flex network architecture schematic diagram behind another increase data backup center shown in Figure 5, if the A-Flex function realizes on MGW, then finish by MGW to the action of data backup center inquiring user ownership MSCServer information, the data backup center need return to MGW with the MSCServer information of selecting, and MGW is routed to user's initiation layer 3 message on the MSC Server that returns at the data backup center more then.Wherein, how to select the process of MSC Server consistent about the data backup center, repeat no more here with step 403.

In this article, for ease of describing, BSC and MGW can be referred to as the message discharge device; MSC and MSC Server are referred to as core net (CN, Core Network) node.

Correspondingly, the embodiment of the invention also provides and has determined route system in a kind of CDMA A-Flex network.This system configuration mainly comprises referring to shown in Figure 6: data backup center, at least one message discharge device and at least one CN node.Wherein,

Referring to shown in Figure 7, the data backup center specifically can comprise: data are preserved unit and node determining unit; The message discharge device specifically can comprise: message sink unit and message Dispatching Unit.Wherein,

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;

Referring to shown in Figure 8, the node determining unit can comprise: 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, 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, if exist the corresponding CN node and the signalling point of this CN node to reach, then this CN nodal information returned to the information transmit-receive unit; If have corresponding CN node but the signalling point of this CN node is unreachable, perhaps judge and do not have corresponding CN node, then 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.

Wherein, the CN node can be further used for the information notification data backup center that will user registration success be arranged or have the user to delete; The data backup center can further comprise: 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.

Data updating unit also can be 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.

Wherein, the data backup center can be physical equipment independently, perhaps is the functional part in the CN node.When CDMA A-Flex network using was carried and controlled the network architecture of one, the CN node was MSC, and the message discharge device is BSC; When CDMA A-Flex network using carrying during with the network architecture that control separates, the CN node is MSC Server, and the message discharge device is BSC or MGW.

Need to prove, though the data backup center that only drawn among Fig. 3, Fig. 5 and Fig. 6,, in actual applications, more than one data backup center can be set according to the actual requirements.A plurality of data backups both can be adopted active/standby mode work between the center, also can adopt the mode of helping each other to work.Figure 9 shows that a kind of CDMA A-Flex network architecture schematic diagram that adopts the master/slave data backup center, it is synchronous that the data of master/slave data backup center need keep.

As seen, in embodiments of the present invention, all message discharge devices in the pond all are the routes of determining user message in the heart according to the information of being preserved in the data backup, can avoid the inconsistent user who causes of routing iinformation who is safeguarded owing to each message discharge device in the prior art to serve the situation generation that the CN node changes, upgrade thereby reduced the interoffice position.

The above has carried out further detailed description to purpose of the present invention, technical scheme and beneficial effect; institute is understood that; the above is not in order to restriction the present invention; within the spirit and principles in the present invention all; any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

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,

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

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

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 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,

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,

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,

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,