CN102726078B - Method for mobile terminal registration in Pool area and access network entity - Google Patents

Abstract

A method and system for registering a mobile terminal in a Pool area, and an access network entity, the method comprising: the access network entity receives a request message sent by the mobile terminal, the request message carries identity information of the mobile terminal, and the request The message is used to request mobile terminal registration; the access network entity selects the SGSN with normal status and the highest priority from the general packet radio service support node SGSN status table; the access network entity sends the request message to the SGSN with the highest priority to complete the registration of the mobile terminal. The flexibility of SGSN selection can be improved.

Description

Mobile terminal registration method and access network entity in Pool area

technical field

The invention relates to the field of mobile communication, in particular to a method for registering a mobile terminal in a Pool area and an access network entity.

Background technique

In a mobile communication network, in order to provide users with a more stable online experience, usually a plurality of Serving GPRS Support Nodes (SGSN) deployed in different areas form a pool (Pool) area. Not only does it not need to switch the serving SGSN when the mobile terminal roams in the area, but also the service reliability of the mobile terminal is improved.

A schematic diagram of a Pool area is shown in FIG. 1, wherein SGSN1, SGSN2, and SGSN3 deployed in cities city1, city2, and city3 form a pool area. The mobile terminal can roam in the pool area shown in FIG. 1 without switching the serving SGSN. Further, as shown in FIG. 1, radio network controllers (Radio Network Controller, RNC) 1, 2 and 3 are RNCs deployed in cities city1, city2 and city3 respectively. Wherein, RNC1, RNC2 and RNC3 are respectively connected to SGSN1, SGSN2 and SGSN3 through the leased bearer network. Generally, the leased bearer network is paid according to the traffic, so operators often hope that mobile terminals under the scope of RNC1 can preferably register with the local SGSN1, mobile terminals under the scope of RNC2 can preferably register with the local SGSN2, and mobile terminals under the scope of RNC3 can preferably register Local SGSN3 registration. In practical applications, when an SGSN in the Pool area is abnormal (for example, the SGSN fails or the link between the SGSN and its corresponding RNC fails), the RNC corresponding to the SGSN will use the capacity ratio of the other SGSNs as its range The mobile terminal under selects the corresponding SGSN to register. Taking the Pool area shown in Figure 1 as an example, if the capacity ratio of SGSN1, SGSN2, and SGSN3 configured on RNC2 is 3:3:4, when SGSN2 is abnormal, RNC2 will use it according to the capacity ratio of SGSN1 and SGSN3 of 3:4. The mobile terminal under the range selects the corresponding SGSN to register. For example, when RNC2 receives the request sent by each mobile terminal under its range, it can randomly generate a random number n, and perform a modulo 7 (7=3+4) operation on the random number n, if the operation result In the range of (0-2), RNC2 selects SGSN1 as its mobile terminal to register, and if the calculation result is in the range of (3-6), RNC2 selects SGSN3 as its mobile terminal to register, so that After a period of time, all mobile terminals under the range of RNC2 will complete registration and attach to SGSN1 and SGSN3.

In practice, it is found that the flexibility of the mobile terminal registration method in the above-mentioned Pool area is poor, especially when a certain SGSN in the Pool area is abnormal, the RNC corresponding to the SGSN will send the requests of all mobile terminals under its scope according to the capacity ratio of the remaining SGSNs. Sending to the corresponding SGSN for registration, this method cannot meet the requirement of selecting the SGSN for registration according to network conditions.

Contents of the invention

The embodiment of the present invention provides a method for registering a mobile terminal in a Pool area and an access network entity, which can improve the flexibility of SGSN selection.

A method for registering a mobile terminal in a Pool area, comprising:

The access network entity receives a request message sent by the mobile terminal, the request message carries the identity information of the mobile terminal, and the request message is used to request registration of the mobile terminal;

The access network entity selects the SGSN with normal status and the highest priority from the SGSN status table of the general packet radio service support node;

The access network entity sends the request message to the SGSN with the highest priority, so as to complete the registration of the mobile terminal.

An access network entity, applied to a Pool area, including:

The first unit is configured to receive a request message sent by the mobile terminal, the request message carrying the identity information of the mobile terminal; the request message is used to request registration of the mobile terminal;

The second unit is used to select the SGSN with normal status and the highest priority from the SGSN status table of the general packet radio service support node;

The third unit is configured to send the request message to the SGSN with the highest priority, so as to complete the registration of the mobile terminal.

In the above solution provided by the embodiment of the present invention, after the access network entity receives the request message sent by the mobile terminal, it can select the SGSN with normal status and the highest priority from the SGSN status table, and send the request message to the priority The highest-level SGSN to complete the registration of the mobile terminal. Especially when the SGSN corresponding to the access network entity is abnormal, the mobile terminal can select the SGSN closest to the SGSN corresponding to the access network entity or the SGSN with the least number of mobile terminal accesses for registration, thereby improving the flexibility of SGSN selection .

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some examples of the embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

FIG. 1 is a schematic diagram of an existing Pool area;

Fig. 2 is a flowchart of a method for registering a mobile terminal in a Pool area provided by an embodiment of the present invention;

Fig. 3, Fig. 4 are the flowcharts of the mobile terminal registration methods in several Pool areas provided by the embodiments of the present invention;

5 to 9 are structural diagrams of several access network entities provided by embodiments of the present invention;

FIG. 10 is a structural diagram of a mobile terminal registration system in a Pool area provided by an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The embodiment of the present invention provides a mobile terminal registration method and system in a Pool area, and an access network entity, which can improve the flexibility of SGSN selection. The following will be described through specific examples.

Embodiment one:

Please refer to FIG. 2 . FIG. 2 is a method for registering a mobile terminal in a Pool area provided by an embodiment of the present invention. Wherein, the method described in Fig. 2 can be applied to code division multiple access 2000 (Code Division Multiple Access 2000, CDMA2000), wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA), time division synchronous code division multiple access (Time Division- Synchronous Code Division Multiple Access, TD-SCDMA) and other third-generation mobile communication systems (3rd-generation, 3G) systems, can also be applied to global mobile communication systems (Global System For Mobile Communications, GSM) and other second-generation mobile communication systems . Furthermore, if the method described in FIG. 2 is applied to a 3G system, the method described in FIG. 2 can be performed by the radio network controller (RNC) in the Pool area to realize the registration of the mobile terminal in the Pool; if the method described in FIG. 2 If the method is applied to the second generation mobile communication system, the method described in FIG. 2 can be executed by the base station controller (Base Station Controller, BSC) in the Pool area, and the registration of the mobile terminal in the Pool can also be realized. For ease of description, in the method described in FIG. 2 , the RNC and the BSC are collectively referred to as an access network entity, that is, the access network entity described later in the embodiment of the present invention may be either an RNC or a BSC. As shown in Figure 2, the method may include the following steps:

201. An access network entity receives a request message sent by a mobile terminal, the request message carries identity information of the mobile terminal, and the request message is used to request the mobile terminal to register.

Wherein, the above request message may be an Attach Request message, or a router update request message, which is not limited in this embodiment of the present invention.

Wherein, the mobile terminal may be a mobile terminal that roams within the coverage of the access network entity, or may be a local mobile terminal within the coverage of the access network entity, which is not limited in this embodiment of the present invention.

Wherein, the mobile terminal may be user equipment (User Equipment, UE) distributed throughout the wireless network, and each UE may be static or mobile. The UE can also be called a terminal, a mobile station, a subscriber unit, a station, etc. UE can be cellular phone (cellular phone), personal digital assistant (Personal Digital Assistant, PDA), wireless modem (modem), wireless communication device, handheld device (handheld), laptop computer (laptop computer), cordless phone (cordlessphone) , wireless local loop (Wireless Local Loop, WLL) station, etc. The UE may communicate with a macro base station, a pico base station, a femto cell (femto) base station, and the like.

Wherein, the identity information of the mobile terminal may be an International Mobile Subscriber Identification Number (IMSI) of the mobile terminal, or a Temporary Mobile Subscriber Identification Number (P-TMSI) of the mobile terminal. Wherein, the P-TMSI of the mobile terminal will carry a Network Resource Identifier (Network Resource Identifier, NRI), and the NRI is allocated by a certain SGSN that the mobile terminal accessed last time, and is used to identify the SGSN.

In practical application, when the mobile terminal sends the Attach Request message AttachRequest or the router update request message to the access network entity for the first time, the Attach Request message or the Router Update Request message may carry the IMSI used to represent the identity of the mobile terminal. When the mobile terminal successfully registers to an SGSN in the Pool area for the first time, the SGSN will assign the P-TMSI containing the local NRI to the mobile terminal, so that the mobile terminal will send an Attach Request message to the access network entity or router When updating the request message, the Attach Request message or the router update request message may carry the P-TMSI used to indicate the identity of the mobile terminal. In this way, when the access network entity receives the Attach Request message Attach Request or the router update request message sent by the mobile terminal, it can parse out the NRI from the P-TMSI carried in the Attach Request message Attach Request or the router update request message, and send the mobile terminal The sent attach request message or router update request message is sent to the SGSN corresponding to the NRI. Therefore, it can be guaranteed that the mobile terminal in the Pool can be routed to the SGSN registered by the mobile terminal every time it initiates an attach request or a router update request, so that the mobile terminal does not need to change the serving SGSN when roaming in the Pool area. Compared with the traditional networking, the NRI can reduce the signaling load of the Iu/Gb interface in the Pool networking.

Generally, the NRI is located in the 23rd to 14th bits of the P-TMSI. The length of the NRI can be adjusted (0~10 bits). When the length of the NRI is not 0, the NRI must start with the 23rd bit. The NRI lengths configured in the SGSNs in the Pool area and the access network entities (that is, the RNC or BSC) corresponding to the SGSNs must be the same.

Wherein, the access network entity (that is, RNC or BSC) corresponding to the SGSN refers to the RNC or BSC connected to the local SGSN when the SGSN serves as the local SGSN.

202. The access network entity selects an SGSN with a normal state and the highest priority from the SGSN state table.

Among them, the SGSN with the highest priority can be the SGSN corresponding to the access network entity, or the SGSN closest to the SGSN corresponding to the access network entity when the SGSN corresponding to the access network entity is abnormal, or it can also be the SGSN that the mobile terminal accesses. The SGSN with the least number may also be an SGSN that meets other conditions, which is not limited in this embodiment of the present invention.

Wherein, the SGSN corresponding to the access network entity refers to the local SGSN accessed by the access network entity.

In the embodiment of the present invention, the SGSN status table can be used to record the SGSNs in normal status and their priority levels. For example, when the SGSN corresponding to the access network entity is abnormal, the SGSN with the highest priority may be the closest SGSN to the SGSN corresponding to the access network entity (that is, the local SGSN accessed by the access network entity), or it may be The SGSN with the least number of mobile terminals accessing. Obviously, when the SGSN corresponding to the access network entity is abnormal, the number of SGSNs closest to the SGSN corresponding to the access network entity can be one or at least two; similarly, the number of SGSNs with the least number of mobile terminal accesses can also be One or at least two. That is to say, when the SGSN corresponding to the access network entity is abnormal, the state selected from the preset SGSN state table is normal, and the number of SGSNs with the highest priority can be one or at least two. Of course, when the state of the SGSN corresponding to the access network entity is normal, the SGSN with the highest priority selected from the SGSN state table may be the SGSN corresponding to the access network entity, so that the mobile terminal can preferably select the SGSN corresponding to the access network entity for register. Obviously, if the SGSN with the highest priority selected from the SGSN state table is the SGSN corresponding to the access network entity, then the number of the SGSN with the highest priority selected from the SGSN state table is one.

Optionally, in the above SGSN state table, for each SGSN in a normal state, its corresponding capacity, number of times of mobile terminal access, and number of times and reasons for mobile terminal access failures within a certain period of time may also be recorded. limited.

Among them, the SGSN abnormality may be that the SGSN itself fails, or the link between the SGSN and its corresponding access network entity fails, or the Gr interface between the SGSN and the Home Location Register (HLR) Unavailable, it may also be that the Gr interface between the SGSN and the gateway via a packet radio service support node (Gateway GPRS Support Node, GGSN) is unavailable. Further, after an abnormality occurs in the SGSN, the SGSN may proactively broadcast a message indicating that the abnormality occurs, which is not limited in this embodiment of the present invention.

203. The access network entity sends the request message to the SGSN with the highest priority, so as to complete the registration of the mobile terminal.

As mentioned above, the number of SGSNs with the highest priority selected by the access network entity from the SGSN state table can be at least two, then when the identity information of the mobile terminal carried in the request message sent by the mobile terminal is IMSI , step 203 may specifically be:

The access network entity sends the request message to the corresponding SGSN among the at least two SGSNs with the highest priority according to the pre-configured capacity ratio of the at least two SGSNs with the highest priority, so as to complete the registration of the mobile terminal;

Alternatively, the access network entity sends the request message to the one of the at least two SGSNs with the highest priority that has the least access quantity of mobile terminals, so as to complete the registration of the mobile terminal.

For example, assuming that the access network entity selects SGSN1 and SGSN3 with the highest priority from the SGSN state table, and the priority levels are consistent, where the capacity ratio of SGSN1 and SGSN3 is 5:2, then the access network entity can randomly generate A random number n, and perform a modulo 7 (7=5+2) operation on the random number n, if the operation result is within the range of (0-4), the access network entity can send a request message to SGSN1 for registration; If the calculation result is within the range of (5-6), the access network entity may send a request message to SGSN3 for registration.

For another example, assume that the access network entity selects SGSN1 and SGSN3 with the highest priority from the SGSN state table, and the priority levels are the same. number of times; then the access network entity may send the request message to the SGSN1 with the least number of mobile terminal accesses.

Of course, if the SGSN with the highest priority selected by the access network entity from the SGSN state table is the corresponding SGSN of the access network entity, the access network entity may send a request message to its corresponding SGSN for registration.

As mentioned above, the number of SGSNs with the highest priority selected by the access network entity from the SGSN state table can be at least two, then when the identity information of the mobile terminal carried in the request message sent by the mobile terminal is P- In the case of TMSI, step 203 may specifically be:

The access network entity parses the NRI from the P-TMSI, and judges whether there is an SGSN identified by the NRI among at least two SGSNs with the highest priority selected from the preset SGSN state table, and if so, the access network entity The entity can send the request message to the SGSN identified by the NRI to complete the registration of the mobile terminal; if it does not exist, the access network entity can send the request message to the preconfigured capacity ratio of at least two SGSNs with the highest priority Corresponding SGSNs in at least two SGSNs with the highest priority levels to complete the registration of the mobile terminal; or, the access network entity may send the request message to the one with the least number of mobile terminal accesses among the at least two SGSNs with the highest priority levels, To complete the registration of the mobile terminal.

As an optional implementation manner, the method described in FIG. 2 may also include the following steps:

The access network entity receives the registration completion response message returned by the SGSN with the highest priority and sends the registration completion response message to the mobile terminal to complete the registration of the mobile terminal.

Wherein, the above-mentioned registration completion response message may be an Attach Accept message, or a router update completion response message, which is not limited in this embodiment of the present invention.

Among them, the above-mentioned registration completion response message is sent by the SGSN with the highest priority after verifying that the identity information carried in the request message (such as Attach Request) sent by the mobile terminal is correct (that is, verifying that the identity of the mobile terminal is correct). The purpose of the registration completion response message (such as Attach Accept message) is to confirm that the mobile terminal is successfully attached.

As an optional implementation manner, in the above-mentioned method provided by the embodiment of the present invention, after the access network entity completes step 201, it may also first perform the following steps:

The access network entity detects whether the preferred SGSN function is enabled. If the preferred SGSN function is enabled, the access network entity then performs steps 202 to 203; , send a request message (such as Attach Request) to the corresponding SGSN to complete the registration of the mobile terminal. Correspondingly, the mobile terminal can also receive a registration completion response message (such as an attach acceptance message Attach Accept) returned by the corresponding SGSN, and send a registration completion response message (such as an attachment acceptance message Attach Accept) to the mobile terminal, thereby completing the registration of the mobile terminal . Wherein, the corresponding SGSN may be the SGSN corresponding to the access network entity, or other SGSNs, which is not limited in this embodiment of the present invention.

In the above method provided by the embodiment of the present invention, the access network entity can also detect the status of each SGSN in the Pool area, if a certain SGSN is detected to be normal, it means that the SGSN can participate in the selection of the SGSN by the access network entity, The SGSN and its priority level can be written into the SGSN state table, thereby forming the SGSN state table. Conversely, if a certain SGSN is detected to be abnormal, the SGSN does not participate in the selection of the SGSN by the access network entity, and there is no need to write the SGSN into the state table.

As an optional implementation, the access network entity detects the state of each SGSN in the Pool area, and forms the SGSN state table in the following manner:

The access network entity sends a probe signaling to each SGSN in the Pool area, and detects whether a probe signaling response returned by the SGSN in the Pool area for the probe signaling is received within a preset time, and if so, determines to return The SGSN that responded to the probe signaling is normal, and the SGSN that returned the probe signaling response and its priority level are written into the SGSN status table; .

Among them, the access network entity can set a preset time in minutes. After the access network entity sends the detection signaling, if it receives the detection signaling response returned by a certain SGSN within the preset time, it means that the If the SGSN is normal, it can participate in the selection of the SGSN by the access network entity; otherwise, it means that the SGSN is abnormal, and the SGSN does not need to participate in the selection of the SGSN by the access network entity.

Alternatively, the access network entity can set a time period T in minutes, and the access network entity sends a detection signal to a certain SGSN every time period T. If the SGSN is not received after sending N times of detection signals continuously Returned probe signaling response, or M times (M<N) in N times of probe signaling did not receive the probe signaling response returned by the SGSN, then the SGSN is considered to be abnormal; otherwise, the SGSN is considered to be normal, and the SGSN Can participate in the selection of the SGSN by the access network entity.

In practical applications, the access network entity may periodically send detection signaling to each SGSN in the Pool area, or may be triggered by an event to send detection signaling to each SGSN in the Pool area, which is not limited in the embodiment of the present invention.

As another optional implementation manner, the access network entity detects the state of each SGSN in the Pool area and forms the SGSN state table in the following manner:

The access network entity receives the broadcast message sent by any SGSN in the Pool area, and the broadcast message is used to indicate that the SGSN is abnormal; the access network entity determines that the rest of the SGSNs in the Pool area except the SGSN are normal, and sends the remaining SGSN and Its priority level is written into the SGSN status table. Wherein, the SGSN abnormality includes the failure of the SGSN itself, and/or the unavailability of the Gr interface between the SGSN and the HLR, and/or the unavailability of the Gn interface between the SGSN and the GGSN, and so on.

After the access network entity receives the request message sent by the mobile terminal, the access network entity can select the SGSN with the highest priority from the SGSN state table, and send the request message to the SGSN with the highest priority to complete the mobile terminal registration. It can be seen that Embodiment 1 of the present invention can improve the flexibility of SGSN selection, especially when the SGSN corresponding to the access network entity is abnormal, the SGSN or the mobile terminal closest to the SGSN corresponding to the access network entity can be selected for the mobile terminal. The terminal accesses the SGSN with the least number to register, which improves the flexibility of SGSN selection.

Embodiment two:

Please refer to FIG. 3 . FIG. 3 is a flow chart of several registration methods for mobile terminals in the Pool area provided by Embodiment 2 of the present invention. In the method described in FIG. 3 , it is assumed that the Pool area is composed of SGSN1 and SGSN2, and the method for registering a mobile terminal in the Pool area provided by the embodiment of the present invention is introduced by taking RNC as an access network entity as an example. When the BSC acts as an access network entity, the specific implementation process of the method for registering a mobile terminal in the Pool area is similar to that shown in FIG. 3 , so the second embodiment of the present invention will not be repeated. In the method described in Fig. 3, the RNC can exclude abnormal SGSNs in the Pool area, enable the preferred SGSN function and record the SGSN capacity ratio and/or mobile terminal access times (SGSN capacity ratio and/or mobile terminal The access times can be regarded as the SGSN weight). In addition, when the SGSN in the Pool area determines that the Gr interface is unavailable and/or the Gn interface is unavailable, it may also notify the RNC that the SGSN is abnormal.

As shown in Figure 3, the implementation process of a mobile terminal registration method in the Pool area is as follows:

11. The mobile terminal UE sends an Attach Request message carrying the IMSI to the RNC.

12. The RNC selects the SGSN2 with a normal state and the highest priority from the SGSN status table; wherein, the SGSN2 with the highest priority is the SGSN corresponding to the RNC (that is, the local SGSN accessed by the RNC).

13. The RNC sends the Attach Request message carrying the IMSI to the SGSN2.

14. The RNC receives the Attach Accept message returned by the SGSN2.

Wherein, the Attach Accept message returned by SGSN2 carries the P-TMSI allocated by SGSN2 for the mobile terminal UE, and the P-TMSI includes the NRI of SGSN2.

15. The RNC sends the Attach Accept message returned by the SGSN2 to the mobile terminal UE to complete the registration of the mobile terminal UE.

As shown in Figure 3, the implementation process of another mobile terminal registration method in the Pool area is as follows:

21. The mobile terminal UE sends an Attach Request message carrying the P-TMSI to the RNC.

Wherein, the P-TMSI carried in the Attach Request message is allocated by the SGSN2 for the mobile terminal UE, and the P-TMSI includes the NRI of the SGSN2.

22. The RNC selects the SGSN2 with the highest priority from the SGSN state table; wherein, the SGSN2 with the highest priority is the SGSN corresponding to the RNC.

Wherein, since the SGSN with the highest priority selected by the RNC from the SGSN state table has one and only SGSN2, the NRI of SGSN2 included in the P-TMSI sent by the UE does not work.

23. The RNC sends the Attach Request message carrying the P-TMSI to the SGSN2.

24. The RNC receives the Attach Accept message returned by the SGSN2.

25. The RNC sends the Attach Accept message returned by the SGSN2 to the mobile terminal UE to complete the registration of the mobile terminal UE.

As shown in Figure 3, the implementation process of another mobile terminal registration method in the Pool area is as follows:

31. The mobile terminal UE sends an Attach Request message carrying the P-TMSI to the RNC.

Wherein, the P-TMSI carried in the Attach Request message is allocated by the SGSN2 for the mobile terminal UE, and the P-TMSI includes the NRI of the SGSN2.

32. The RNC selects the SGSN1 with the highest priority from the SGSN state table; wherein, the SGSN2 corresponding to the RNC is abnormal.

Wherein, since the SGSN with the highest priority selected by the RNC from the SGSN state table has one and only SGSN1, the NRI of SGSN2 included in the P-TMSI sent by the UE has no effect.

33. The RNC sends the Attach Request message carrying the P-TMSI to the SGSN1.

34. The RNC receives the Attach Accept message returned by the SGSN1.

Wherein, the Attach Accept message returned by SGSN1 carries the P-TMSI allocated by SGSN1 for the mobile terminal UE, and the P-TMSI includes the NRI of SGSN1.

35. The RNC sends the Attach Accept message returned by the SGSN1 to the mobile terminal UE to complete the registration of the mobile terminal UE.

Embodiment 2 of the present invention can improve the flexibility of SGSN selection, especially when the SGSN corresponding to the RNC is abnormal, it can select the SGSN closest to the SGSN corresponding to the RNC for the mobile terminal or the SGSN with the least number of mobile terminals to access for registration, thereby improving This increases the flexibility of SGSN selection.

Embodiment three:

Please refer to FIG. 4 . FIG. 4 is a flowchart of several methods for registering a mobile terminal in a Pool area provided by Embodiment 3 of the present invention. In the method described in FIG. 4 , it is assumed that the Pool area is composed of SGSN1 and SGSN2, and the method for registering a mobile terminal in the Pool area provided by the embodiment of the present invention is introduced by taking RNC as an access network entity as an example. When the BSC is used as the access network entity, the specific implementation process of the mobile terminal registration method in the Pool area is similar to that shown in FIG. 4 , therefore, the third embodiment of the present invention will not be repeated. In the method described in Fig. 3, the RNC can exclude abnormal SGSNs in the Pool area, and enable the preferred SGSN function and record the SGSN capacity ratio and/or mobile terminal access times with the same priority level (SGSN capacity ratio and/or mobile terminal access times). The number of terminal access times can be regarded as the SGSN weight). In addition, when the SGSN in the Pool area determines that the Gr interface is unavailable and/or the Gn interface is unavailable, it may also notify the RNC that the SGSN is abnormal.

As shown in Figure 4, the implementation process of a mobile terminal registration method in the Pool area is as follows:

41. The mobile terminal UE sends an Attach Request message carrying the P-TMSI to the RNC.

Wherein, the P-TMSI carried in the Attach Request message is allocated by the SGSN2 for the mobile terminal UE, and the P-TMSI includes the NRI of the SGSN2.

42. The RNC selects the SGSN1 with the highest priority from the SGSN state table; wherein, the SGSN2 corresponding to the RNC is abnormal.

43. The RNC sends the Attach Request message carrying the P-TMSI to the SGSN1.

Wherein, since the SGSN with the highest priority selected by the RNC from the SGSN state table has one and only SGSN1, the NRI of SGSN2 included in the P-TMSI sent by the UE has no effect.

44. The RNC receives the Attach Accept message returned by the SGSN1.

Wherein, the Attach Accept message returned by SGSN1 carries the P-TMSI allocated by SGSN1 for the mobile terminal UE, and the P-TMSI includes the NRI of SGSN1.

45. The RNC sends the Attach Accept message returned by the SGSN1 to the mobile terminal UE to complete the registration of the mobile terminal UE.

As shown in Figure 4, the implementation process of another mobile terminal registration method in the Pool area is as follows:

51. The mobile terminal UE sends an Attach Request message carrying the P-TMSI to the RNC.

Wherein, the P-TMSI carried in the Attach Request message is allocated by the SGSN1 for the mobile terminal UE, and the P-TMSI includes the NRI of the SGSN1.

52. The RNC selects SGSN2 with the highest priority from the SGSN status table;

Wherein, the RNC detects that the SGSN2 corresponding to the RNC returns to normal through the method described above, and the RNC writes the SGSN2 and its priority into the SGSN state table, and the priority of the SGSN2 is the highest.

53. The RNC sends the Attach Request message carrying the P-TMSI to the SGSN2.

Wherein, since the SGSN with the highest priority selected by the RNC from the SGSN state table has one and only SGSN2, the NRI of SGSN1 included in the P-TMSI sent by the UE does not work.

54. The RNC receives the Attach Accept message returned by the SGSN2.

Wherein, the Attach Accept message returned by SGSN2 carries the P-TMSI allocated by SGSN2 for the mobile terminal UE, and the P-TMSI includes the NRI of SGSN2.

55. The RNC sends the Attach Accept message returned by the SGSN2 to the mobile terminal UE to complete the registration of the mobile terminal UE.

Embodiment 3 of the present invention can improve the flexibility of SGSN selection, especially when the SGSN corresponding to the RNC is abnormal, it can select the SGSN closest to the SGSN corresponding to the RNC for the mobile terminal or the SGSN with the least number of accesses to the mobile terminal for registration, thereby improving This increases the flexibility of SGSN selection.

Embodiment four:

Please refer to FIG. 5 . FIG. 5 is a structural diagram of an access network entity provided by Embodiment 4 of the present invention, which is applied to a Pool area. Wherein, the access network entity provided in Embodiment 4 of the present invention may be an RNC or a BSC, which is not limited in this embodiment of the present invention. As shown in Figure 5, the access network entity may include:

The first unit 501 is configured to receive a request message sent by a mobile terminal, the request message carries identity information of the mobile terminal, and the request message is used to request registration of the mobile terminal.

Wherein, the above request message includes an attach request message and/or a router update request message.

The second unit 502 is configured to select an SGSN with a normal state and the highest priority from the SGSN state table.

Among them, the SGSN with the highest priority can be the SGSN corresponding to the access network entity, or the SGSN closest to the SGSN corresponding to the access network entity when the SGSN corresponding to the access network entity is abnormal, or it can also be the SGSN that the mobile terminal accesses. The SGSN with the least number may also be other SGSNs, which is not limited in this embodiment of the present invention.

Wherein, the foregoing distance may be a physical distance or a routing distance, which is not limited in this embodiment of the present invention.

The third unit 503 is configured to send the above request message to the SGSN with the highest priority, so as to complete the registration of the mobile terminal.

As an optional implementation manner, the first unit 501 may also be configured to receive a registration completion response message returned by the SGSN with the highest priority;

Correspondingly, the access network entity shown in FIG. 5 may further include a fourth unit 504, configured to send the above registration completion response message to the mobile terminal to complete the registration of the mobile terminal.

In the embodiment of the present invention, the second unit 502 may store an SGSN status table for recording SGSNs in normal status and their priority levels. For example, when the SGSN corresponding to the access network entity is abnormal, the SGSN with the highest priority may be the closest SGSN to the SGSN corresponding to the access network entity, or the SGSN with the least number of mobile terminals. Obviously, when the SGSN corresponding to the access network entity is abnormal, the number of SGSNs closest to the SGSN corresponding to the access network entity can be one or at least two; similarly, the number of SGSNs with the least number of mobile terminal accesses can also be One or at least two. That is to say, when the SGSN corresponding to the access network entity is abnormal, the number of SGSNs with the highest priority selected by the second unit 502 from the SGSN state table may be one or at least two. Of course, when the SGSN corresponding to the access network entity is normal, the SGSN with the highest priority selected by the second unit 502 from the SGSN status table may be the SGSN corresponding to the access network entity, so that the mobile terminal can preferably select the SGSN corresponding to the access network entity. Register with the SGSN. Obviously, if the SGSN with the highest priority selected by the second unit 502 from the SGSN state table is the SGSN corresponding to the access network entity, then the number of SGSNs with the highest priority selected by the second unit 502 from the SGSN state table is for one.

Optionally, in the SGSN state table stored by the above-mentioned second unit 502, for each SGSN in a normal state, its corresponding capacity, the number of mobile terminal accesses, and the number of mobile terminal access failures and reasons within a certain period of time may also be recorded. , the embodiments of the present invention are not limited.

As an optional implementation manner, the identity information of the mobile terminal may be the IMSI of the mobile terminal.

As mentioned above, the number of SGSNs with the highest priority selected by the second unit 502 from the SGSN state table can be at least two, then when the identity information of the mobile terminal is the IMSI of the mobile terminal, the third unit 503 specifically uses According to the pre-configured capacity ratio of the at least two SGSNs with the highest priority, send the request message to the corresponding SGSN among the at least two SGSNs with the highest priority to complete the registration of the mobile terminal; or send the request message It is sent to the at least two SGSNs with the highest priority that have the least number of mobile terminal accesses, so as to complete the registration of the mobile terminal.

As an optional implementation manner, the identity information of the mobile terminal may be the P-TMSI of the mobile terminal.

As mentioned above, the number of SGSNs with the highest priority selected by the second unit 502 from the SGSN state table can be at least two, then when the identity information of the mobile terminal is the P-TMSI of the mobile terminal, the third unit 503 The structure diagram can be shown in Figure 6, including:

The first module 5031 is configured to parse out the NRI from the P-TMSI carried in the above request message;

The second module 5032 is used to judge whether there is an SGSN identified by NRI in the SGSN with the highest priority selected from the SGSN state table;

The third module 5033 is configured to send a request message to the SGSN identified by the NRI when the judgment result of the second module 5032 is yes, so as to complete the registration of the mobile terminal.

As an optional implementation manner, the third unit 503 may also include a fourth module 5034:

The fourth module 5034 is configured to send the request message to the at least two SGSNs with the highest priority according to the preconfigured capacity ratio of the at least two SGSNs with the highest priority when the judgment result of the second module 5032 is No The corresponding SGSN in the SGSN to complete the registration of the mobile terminal; or to send a request message to the one of the at least two SGSNs with the highest priority that has the least number of mobile terminal accesses to complete the registration of the mobile terminal.

For example, assuming that the second unit 502 selects from the SGSN state table that the state is normal and the SGSN with the highest priority includes SGSNI and SGSN3, wherein the priority levels of SGSNI and SGSN3 are the same, and the capacity ratio of SGSNI and SGSN3 is 2:3, Then when the second module 5032 judges that there is no SGSN identified by the NRI identified by the first module in SGSNI and SGSN3, the fourth module 5034 can randomly generate a random number n, and modulo 5 (5=2+ 3) calculation, if the calculation result is within the range of (0-1), the fourth module 5034 can send a request message to SGSN1 for registration; if the calculation result is within the range of (2-4), the fourth module 5034 can send the The request message is sent to SGSN3 for registration.

Please also refer to FIG. 7 . FIG. 7 is a structural diagram of an access network entity obtained after the access network entity shown in FIG. 6 is further optimized. Compared with the access network entity shown in Figure 6, the access network entity shown in Figure 7 also includes:

The fifth unit 505 is used to detect whether the SGSN function is enabled after the first unit 501 receives the request message sent by the mobile terminal, and if so, notify the second unit 502 to select the state from the preset SGSN state table to be normal, And the SGSN with the highest priority; if not, according to the pre-configured SGSN capacity ratio, send the request message to the corresponding SGSN to complete the registration of the mobile terminal;

Correspondingly, the first unit 501 is also configured to receive a registration completion response message returned by the corresponding SGSN;

The fifth unit 505 is further configured to send the registration completion response message returned by the corresponding SGSN to the mobile terminal to complete the registration of the mobile terminal.

Please also refer to FIG. 8 . FIG. 8 is a structural diagram of another access network entity obtained after the access network entity shown in FIG. 7 is further optimized. Compared with the access network entity shown in Figure 7, the access network entity shown in Figure 8 also includes:

The sixth unit 506 is configured to send probe signaling to each SGSN in the Pool area, and detect whether a probe signaling response returned by the SGSN in the Pool area for the probe signaling is received within a preset time, and if yes, then Determining that the SGSN that returned the probe signaling response is normal, and writing the SGSN that returned the probe signaling response and its priority into the SGSN status table; if not, determining that the SGSN that did not return the probe signaling response is abnormal.

Please also refer to FIG. 9 . FIG. 9 is a structural diagram of another access network entity obtained after the access network entity shown in FIG. 7 is further optimized. Compared with the access network entity shown in Figure 7, the access network entity shown in Figure 9 also includes:

The seventh unit 507 is configured to receive a broadcast message sent by any SGSN in the Pool area, and the broadcast message is used to indicate that the SGSN is abnormal; wherein, the SGSN abnormality may include that the Gr interface of the SGSN is unavailable, the Gn interface is unavailable, etc. etc.; and determine that the remaining SGSNs in the Pool area except the SGSN are normal, and write the remaining SGSNs and their priority levels into the SGSN status table.

In the access network entity provided by the embodiment of the present invention, after receiving the request message sent by the mobile terminal, the SGSN with the highest priority can be selected from the SGSN state table, and the request message can be sent to the SGSN with the highest priority, To complete the registration of the mobile terminal. It can be seen that the embodiments of the present invention can improve the flexibility of SGSN selection, especially when the SGSN corresponding to the access network entity is abnormal, the SGSN closest to the SGSN corresponding to the access network entity or the mobile terminal access network can be selected for the mobile terminal. Register with the SGSN with the least number of entries, which improves the flexibility of SGSN selection.

Embodiment five:

Please refer to FIG. 10 . FIG. 10 is a mobile terminal registration system in a Pool area provided by an embodiment of the present invention. As shown in Figure 10, the system can include:

at least one mobile terminal 1001 and an access network entity 1002;

Wherein, the mobile terminal 1001 is configured to send a request message to the access network entity 1002, the request message carries the identity information of the mobile terminal 1001, and the request message is used to request registration of the mobile terminal.

Wherein, the request message includes an attach request message and/or a router update request message.

Wherein, the mobile terminal 1001 may also receive a registration completion response message sent by the access network entity 1002 to complete the registration of the mobile terminal 1001 .

Wherein, the access network entity 1002 may be an RNC or a BSC.

Wherein, the structure and function of the access network entity 1002 are the same as those of any one of the access network entities shown in FIG. 5 to FIG. 9 , and will not be repeated in this embodiment of the present invention.

Wherein, the dotted line between the mobile terminal 1001 and the access network entity 1002 represents a wireless connection.

The system provided by the embodiments of the present invention can improve the flexibility of SGSN selection, especially when the SGSN corresponding to the access network entity is abnormal, it can select the SGSN closest to the SGSN corresponding to the access network entity for the mobile terminal or the mobile terminal access The minimum number of SGSNs are registered, which improves the flexibility of SGSN selection.

In the embodiment of the present invention, after the local SGSN is abnormal, the RNC can register for the SGSN that is closest to the SGSN corresponding to the RNC in the preferred Pool area of the mobile terminal or the SGSN that the mobile terminal accesses the least number of times, without the need to perform round selection of the remaining SGSNs.

In the embodiment of the present invention, after the SGSN corresponding to the RNC returns to normal, the RNC can automatically migrate the mobile terminal to the SGSN corresponding to the RNC for registration, without manually migrating the mobile terminal to the SGSN corresponding to the RNC for registration, and can do The relocation to all mobile terminals can solve the defect that the RNC in the existing Pool area cannot successfully migrate users who are not attached during the migration process, so that users who are not attached during the migration process cannot be migrated successfully, and achieve 100% user relocation ,

In the embodiment of the present invention, because some information elements delivered to the GGSN can be set on the SGSN, so the flexible delivery to the GGSN such as the charging attribute policy (CC), the time zone (TZ) where the SGSN is located, and different quality of service (QoS) are indirectly realized. ) parameter value, while ensuring greater reliability of the business.

Those of ordinary skill in the art can understand that all or part of the steps for realizing the above-mentioned method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the Including the steps of the foregoing method embodiments; and the aforementioned storage medium includes: various program codes that can be stored in a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk or an optical disk, etc. medium.

The above describes in detail the mobile terminal registration method, system, and access network entity in the Pool area provided by the embodiment of the present invention. In this paper, a specific example is used to illustrate the principle and implementation of the present invention. The description of the above embodiment It is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, The contents of this description should not be construed as limiting the present invention.

Claims (17)

1. A mobile terminal registration method in a Pool area, characterized in that, comprising: The access network entity receives the request message sent by the mobile terminal, the request message carries the identity information of the mobile terminal, and the request message is used to request the registration of the mobile terminal; the identity information includes an international mobile subscriber identification code IMSI or Temporary Mobile Subscriber Identity P-TMSI; The access network entity selects an SGSN with a normal state and the highest priority from the general packet radio service support node SGSN status table; the number of SGSNs with the highest priority is at least two; If the identity information includes an International Mobile Subscriber Identity IMSI, the access network entity sends the request message to the at least two corresponding SGSNs in the SGSNs with the highest priority to complete the registration of the mobile terminal; or, the access network entity sends the request message to the mobile terminal in the at least two SGSNs with the highest priority. enter the least number to complete the registration of the mobile terminal; or, If the identity information includes a temporary mobile subscriber identity code P-TMSI, the access network entity resolves the network resource identifier NRI from the P-TMSI; the access network entity judges that the at least two priority Whether the SGSN identified by the NRI exists in the highest-level SGSN, and if so, the request message is sent to the SGSN identified by the NRI to complete the registration of the mobile terminal. 2. The mobile terminal registration method according to claim 1, further comprising: The access network entity receives the registration completion response message returned by the SGSN with the highest priority; The access network entity sends the registration completion response message to the mobile terminal to complete the registration of the mobile terminal. 3. The mobile terminal registration method according to claim 1, wherein the SGSN with the highest priority is the SGSN corresponding to the access network entity, or the SGSN closest to the SGSN corresponding to the access network entity. The closest SGSN, or the SGSN with the least number of accesses by the mobile terminal. 4. The mobile terminal registration method according to claim 1, further comprising: If the SGSN identified by the NRI does not exist in the at least two SGSNs with the highest priority, the access network entity sends the request to The message is sent to the corresponding SGSN among the at least two SGSNs with the highest priority to complete the registration of the mobile terminal; Alternatively, the access network entity sends the request message to the one of the at least two SGSNs with the highest priority that has the least access quantity of mobile terminals, so as to complete the registration of the mobile terminal. 5. The mobile terminal registration method according to any one of claims 1 to 4, characterized in that, after the access network entity receives the request message sent by the mobile terminal, it further includes: The access network entity detects whether the preferred SGSN function is enabled, and if yes, the access network entity performs the step of selecting the SGSN with normal status and the highest priority from the SGSN status table. 6. The mobile terminal registration method according to claim 5, further comprising: If it is detected that the preferred SGSN function is not enabled, the access network entity sends the request message to the corresponding SGSN according to the pre-configured capacity ratio of the SGSN, so as to complete the registration of the mobile terminal. 7. The mobile terminal registration method according to any one of claims 1 to 4, further comprising: The access network entity sends detection signaling to each SGSN in the Pool area; The access network entity detects whether a probe signaling response returned by the SGSN in the Pool area for the probe signaling is received within a preset time, and if so, determines that the SGSN that returns the probe signaling response is normal, and Write the SGSN that returns the probe signaling response and its priority into the SGSN status table. 8. The mobile terminal registration method according to any one of claims 1 to 4, further comprising: The access network entity receives a broadcast message sent by any SGSN in the Pool area, where the broadcast message is used to indicate that any SGSN is abnormal; The access network entity determines that the remaining SGSNs in the Pool area except the any SGSN are normal, and writes the remaining SGSNs and their priority levels into the SGSN status table. 9. An access network entity, applied to a Pool area, is characterized in that, comprising: The first unit is configured to receive a request message sent by a mobile terminal, where the request message carries identity information of the mobile terminal; the request message is used to request mobile terminal registration; the identity information includes an international mobile user Identity code IMSI or temporary mobile subscriber identity code P-TMSI; The second unit is used to select the SGSN with normal status and the highest priority from the SGSN status table of the general packet radio service support node; the number of SGSNs with the highest priority is at least two; The access network entity further includes: a third unit; If the identity information includes an International Mobile Subscriber Identity IMSI, the third unit is configured to send the request message to the Corresponding SGSNs in at least two SGSNs with the highest priority to complete the registration of the mobile terminal; or, sending the request message to the one with the least number of mobile terminals in the at least two SGSNs with the highest priority , to complete the registration of the mobile terminal; Or, if the identity information includes a temporary mobile subscriber identity code P-TMSI, the third unit includes: a first module, configured to parse out a network resource identifier NRI from the P-TMSI; a second module, It is used to judge whether there is an SGSN identified by the NRI among the at least two SGSNs with the highest priority; the third module is used to send the request message to The SGSN identified by the NRI to complete the registration of the mobile terminal. 10. The access network entity according to claim 9, wherein the first unit is further configured to receive a registration completion response message returned by the SGSN with the highest priority; The access network entity also includes: The fourth unit is configured to send the registration completion response message to the mobile terminal to complete the registration of the mobile terminal. 11. The access network entity according to claim 9 or 10, wherein the SGSN with the highest priority is the SGSN corresponding to the access network entity, or the SGSN corresponding to the access network entity at a distance The SGSN closest to the SGSN, or the SGSN with the least number of mobile terminals accessing. 12. The access network entity according to claim 11, wherein the third unit further comprises: The fourth module is configured to send the request message to the at least two priority SGSNs according to the pre-configured capacity ratio of the at least two highest priority SGSNs when the judgment result of the second module is No. the corresponding SGSN in the highest-level SGSN to complete the registration of the mobile terminal; or send the request message to the one with the least number of mobile terminal accesses among the at least two highest-priority SGSNs to complete the registration of the mobile terminal. Registration of mobile terminals. 13. The access network entity according to claim 9 or 10, further comprising: The fifth unit is configured to detect whether the preferred general packet radio service support node SGSN function is enabled after the first unit receives the request message sent by the mobile terminal, and if so, notify the second unit to switch from the SGSN state Select the SGSN with normal status and the highest priority from the table. 14. The access network entity according to claim 13, characterized in that, If it is detected that the preferred SGSN function is not enabled, the fifth unit is further configured to send the request message to the corresponding SGSN according to the preconfigured capacity ratio of the SGSN, so as to complete the registration of the mobile terminal. 15. The access network entity according to claim 9 or 10, further comprising: A sixth unit, configured to send probe signaling to each SGSN in the Pool area, and detect whether a probe signaling response returned by the SGSN in the Pool area for the probe signaling is received within a preset time , if yes, determine that the SGSN that returned the probe signaling response is normal, and write the SGSN that returned the probe signaling response and its priority into the SGSN status table. 16. The access network entity according to claim 9 or 10, further comprising: A seventh unit, configured to receive a broadcast message sent by any SGSN in the Pool area, where the broadcast message is used to indicate that any SGSN is abnormal; and determine that any SGSN in the Pool area other than the SGSN The remaining SGSNs are normal, and write the remaining SGSNs and their priority levels into the SGSN state table. 17. The access network entity according to claim 9 or 10, wherein the access network entity comprises a radio network controller (RNC) or a base station controller (BSC).

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