CN102726078B - Method for mobile terminal registration in Pool area and access network entity - Google Patents
Method for mobile terminal registration in Pool area and access network entity Download PDFInfo
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Abstract
A method and system for mobile terminal registration in a Pool area and an access network entity. The method includes: an access network entity receiving a request message sent by a mobile terminal, with the request message carrying identity information about the mobile terminal and being used for requesting to perform mobile terminal registration; the access network entity selecting from a serving GPRS support node (SGSN) state list an SGSN in normal state and with the highest priority; the access network entity sending the request message to the SGSN with the highest priority, so as to complete the registration of the mobile terminal. Thus, the flexibility of SGSN selection can be improved.
Description
Technical Field
The invention relates to the field of mobile communication, in particular to a mobile terminal registration method in a Pool area and an access network entity.
Background
In a mobile communication network, in order to provide a more stable internet experience for a user, a Pool (Pool) area is generally formed by a plurality of general packet radio service Support nodes (SGSN) deployed in different areas, and when a mobile terminal roams in the Pool area, not only is a Serving SGSN not required to be switched, 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 at city1, city2 and city3, respectively, constitute a Pool area. The mobile terminal may roam within the pool area shown in fig. 1 without needing to handover the serving SGSN. Further, as shown in fig. 1, Radio Network Controllers (RNCs) 1, 2, and 3 are RNCs deployed in cities 1, 2, and 3, respectively. Among them, RNC1, RNC2 and RNC3 are connected to SGSN1, SGSN2 and SGSN3 through a leased bearer network, respectively. Typically, leased bearer networks are charged per flow, so operators often want mobile terminals under the range of RNC1 to prefer local SGSN1 registration, mobile terminals under the range of RNC2 to prefer local SGSN2 registration, and mobile terminals under the range of RNC3 to prefer local SGSN3 registration. In practical applications, when an SGSN in a Pool area is abnormal (e.g., the SGSN fails or a link between the SGSN and its corresponding RNC fails), the RNC corresponding to the SGSN selects a corresponding SGSN for registration for the mobile terminal in the range according to the capacity ratio of the remaining SGSNs. Taking the Pool area shown in fig. 1 as an example, if the capacity ratio of the SGSN1, the SGSN2 and the SGSN3 configured on the RNC2 is 3: 4, when the SGSN2 is abnormal, the RNC2 selects a corresponding SGSN for registration according to the capacity ratio 3: 4 of the SGSN1 and the SGSN 3. For example, when receiving a request sent by each mobile terminal in the range of the RNC2, the RNC2 may randomly generate a random number n and perform modulo 7(7 equals to 3+4) operation on the random number n, if the operation result is in the range of (0-2), the RNC2 selects the SGSN1 to register for the mobile terminal in the range, and if the operation result is in the range of (3-6), the RNC2 selects the SGSN3 to register for the mobile terminal in the range, so that all the mobile terminals in the range of the RNC2 will complete registration and attach to the SGSN1 and the SGSN3 after a period of time.
In practice, it is found that the flexibility of the mobile terminal registration method in the Pool area is poor, and particularly when a certain SGSN in the Pool area is abnormal, the RNC corresponding to the SGSN sends the requests of all mobile terminals in its range to the corresponding SGSN for registration according to the capacity ratio of the remaining SGSNs.
Disclosure of Invention
The mobile terminal registration method and the access network entity in the Pool area provided by the embodiment of the invention can improve the flexibility of SGSN selection.
A method for registering a mobile terminal in a Pool area comprises the following steps:
an access network entity receives a request message sent by a mobile terminal, wherein the request message carries identity identification information of the mobile terminal, and the request message is used for requesting mobile terminal registration;
the access network entity selects the SGSN with normal state and highest priority level from the general packet radio service support node SGSN state table;
and the access network entity sends the request message to the SGSN with the highest priority level so as to complete the registration of the mobile terminal.
An access network entity applied to a Pool area, comprising:
a first unit, 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 for requesting mobile terminal registration;
a second unit, configured to select an SGSN with a normal state and a highest priority level from a gprs support node SGSN status table;
a third unit, configured to send the request message to the SGSN with the highest priority level, so as to complete registration of the mobile terminal.
In the above-mentioned scheme provided by the embodiment of the present invention, after receiving the request message sent by the mobile terminal, the access network entity may select the SGSN with the normal state and the highest priority level from the SGSN state table, and send the request message to the SGSN with the highest priority level to complete the registration of the mobile terminal. Particularly, 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 SGSN with the least access quantity of the mobile terminal can be selected for the mobile terminal to register, so that the flexibility of SGSN selection is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a Pool area of the prior art;
fig. 2 is a flowchart of a method for registering a mobile terminal in a Pool area according to an embodiment of the present invention;
fig. 3 and fig. 4 are flowcharts of several methods for registering a mobile terminal in a Pool area according to an embodiment of the present invention;
fig. 5 to fig. 9 are structural diagrams of several access network entities according to an embodiment of the present invention;
fig. 10 is a structural diagram of a mobile terminal registration system in a Pool area according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The mobile terminal registration method, the system and the access network entity in the Pool area can improve the flexibility of SGSN selection. The following description will be made by way of specific examples.
The first embodiment is as follows:
referring to fig. 2, fig. 2 is a flowchart illustrating a method for registering a mobile terminal in a Pool area according to an embodiment of the present invention. The method described in fig. 2 may be applied to third-generation Mobile communication systems (3G) such as Code Division Multiple Access 2000 (CDMA 2000), Wideband Code Division Multiple Access (WCDMA), Time Division-synchronous Code Division Multiple Access (TD-SCDMA), and may also be applied to second-generation Mobile communication systems such as global system For Mobile Communications (GSM). Furthermore, if the method described in fig. 2 is applied to a 3G system, the method described in fig. 2 may be executed by a Radio Network Controller (RNC) in a Pool area, so as to implement registration of a mobile terminal in the Pool; if the method described in fig. 2 is applied to a second generation mobile communication system, the method described in fig. 2 may be executed by a Base Station Controller (BSC) in the Pool area, and the registration of the mobile terminal in the Pool may also be implemented. For convenience 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 fig. 2, the method may include the steps of:
201. the access network entity receives a request message sent by the mobile terminal, wherein the request message carries the identity identification information of the mobile terminal, and the request message is used for requesting the mobile terminal to register.
The Request message may be an Attach Request message Attach Request or a router update Request, which is not limited in the embodiment of the present invention.
The mobile terminal may be a mobile terminal roaming into the coverage of the access network entity, or may be a local mobile terminal in the coverage of the access network entity, which is not limited in the embodiment of the present invention.
The mobile terminals may be distributed among User Equipments (UEs) in the whole wireless network, and each UE may be static or mobile. A UE may also be referred to as a terminal (terminal), mobile station (mobile station), subscriber unit (subscriber unit), station (station), etc. The UE may be a cellular phone (cellular phone), a Personal Digital Assistant (PDA), a Wireless modem (modem), a Wireless communication device, a handheld device (hand-held), a laptop computer (laptop computer), a cordless phone (cordless telephone), a Wireless Local Loop (WLL) station, or the like. The UE may communicate with a macro base station, pico (pico) base station, femto (femto) base station, or the like.
The identity information of the Mobile terminal may be an International Mobile Subscriber identity Number (IMSI) of the Mobile terminal, or a temporary Mobile Subscriber identity (P-TMSI) of the Mobile terminal. The P-TMSI of the mobile terminal carries a Network Resource Identifier (NRI), where the NRI is allocated to a certain SGSN to which the mobile terminal has previously accessed, and is used to identify the SGSN.
In practical application, when a mobile terminal initially sends an Attach Request message Attach Request or a router update Request message to an access network entity, the Attach Request message Attach Request or the router update Request message may carry an IMSI used for indicating an identity of the mobile terminal. And after the mobile terminal is successfully registered to a certain SGSN in the Pool area for the first time, the SGSN allocates the P-TMSI containing the NRI of the local office to the mobile terminal, so that when the mobile terminal subsequently sends an Attach Request message Attach Request or a router update Request message to the access network entity again, the Attach Request message Attach Request or the router update Request message can carry the P-TMSI used for representing the identity of the mobile terminal. Thus, when the access network entity receives the Attach Request message Attach Request or the router update Request message sent by the mobile terminal, the access network entity can analyze the NRI from the P-TMSI carried by the Attach Request message Attach Request or the router update Request message, and send the Attach Request message or the router update Request message sent by the mobile terminal to the SGSN corresponding to the NRI. Therefore, the mobile terminal in the Pool can be ensured to be routed to the SGSN registered by the mobile terminal when initiating the attachment request or the router updating request each time, and the serving SGSN does not need to be changed when the mobile terminal roams in the Pool area. Compared with the traditional networking, the Pool networking can reduce the signaling load of an Iu/Gb interface through NRI.
Generally, NRI is located at the 23 th bit to 14 th bit of P-TMSI. The length of NRI can be adjusted to 0-10 bit, and when the length of NRI is not 0, NRI must start at the 23 rd bit. The lengths of NRIs configured in each SGSN and the access network entity (i.e., RNC or BSC) corresponding to each SGSN in the Pool area must be the same.
The access network entity (i.e., RNC or BSC) corresponding to the SGSN means that when the SGSN serves as a local SGSN, the RNC or BSC receives the local SGSN.
202. And the access network entity selects the SGSN with normal state and highest priority from the SGSN state table.
The SGSN with the highest priority level may 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 the SGSN with the least access number of mobile terminals, or the SGSN meeting other conditions, which is not limited in the embodiment of the present invention.
The SGSN corresponding to the access network entity refers to a local SGSN accessed by the access network entity.
In the embodiment of the invention, the SGSN with normal state and the priority level thereof can be recorded by utilizing the SGSN state table. For example, when the SGSN corresponding to the access network entity is abnormal, the SGSN with the highest priority level may be the SGSN closest to the SGSN corresponding to the access network entity (i.e., the local SGSN accessed by the access network entity), or may be the SGSN with the least number of mobile terminals accessed. 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 may be one or at least two; likewise, the number of SGSNs with the smallest number of mobile terminal accesses may be one or at least two. That is, 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 level may be one or at least two. Of course, when the SGSN status corresponding to the access network entity is normal, the SGSN with the highest priority selected from the SGSN status table may be the SGSN corresponding to the access network entity, so that the mobile terminal may prefer the SGSN corresponding to the access network entity to perform registration. Obviously, if the SGSN with the highest priority selected from the SGSN status table is the SGSN corresponding to the access network entity, the number of SGSNs with the highest priority selected from the SGSN status table is one.
Optionally, in the SGSN status table, for each SGSN with a normal status, the corresponding capacity, the number of times of access of the mobile terminal, the number of times of access failure of the mobile terminal within a certain time, and the reason may also be recorded.
The SGSN exception may be that the SGSN itself fails, that a link between the SGSN and its corresponding access network entity fails, that a Gr interface between the SGSN and a Home Location Register (HLR) is unavailable, or that a Gr interface between the SGSN and a Gateway via a packet radio service Support Node (GGSN) is unavailable. Further, after the SGSN has an exception, the SGSN may actively broadcast a message for indicating that the exception occurs, which is not limited in the embodiment of the present invention.
203. And the access network entity sends the request message to the SGSN with the highest priority level so as to complete the registration of the mobile terminal.
As mentioned above, the number of the SGSNs with the highest priority selected by the access network entity from the SGSN status table may be at least two, and then when the identity information of the mobile terminal carried in the request message sent by the mobile terminal is the IMSI, step 203 may specifically be:
the access network entity sends a request message to a corresponding SGSN in the at least two SGSNs with the highest priority levels according to the preconfigured capacity ratio of the at least two SGSNs with the highest priority levels so as to complete the registration of the mobile terminal;
or the access network entity sends the request message to the minimum number of mobile terminals in the at least two SGSNs with the highest priority levels so as to complete the registration of the mobile terminals.
For example, assuming that the access network entity selects the SGSN1 and the SGSN3 with the highest priority and the same priority from the SGSN status table, where the capacity ratio of the SGSN1 to the SGSN3 is 5: 2, the access network entity may randomly generate a random number n and perform modulo 7(7 equals to 5+2) operation on the random number n, and if the operation result is in the range of (0-4), the access network entity may send a request message to the SGSN1 for registration; if the operation result is within the range of (5-6), the access network entity can send a request message to the SGSN3 for registration.
Also for example, assume that the access network entity selects the SGSN1 and SGSN3 with the highest priority and the same priority from the SGSN status table, wherein the number of times of access of the mobile terminal in the SGSNI is less than that of the mobile terminal in the SGSN 3; the access network entity may send a request message to the SGSN1 with the least number of mobile terminal accesses.
Of course, if the SGSN with the highest priority selected from the SGSN status table by the access network entity is the SGSN corresponding to the access network entity, the access network entity may send the request message to the corresponding SGSN for registration.
As mentioned above, the number of the SGSNs with the highest priority selected by the access network entity from the SGSN status table may be at least two, and then when the identity information of the mobile terminal carried in the request message sent by the mobile terminal is P-TMSI, step 203 may specifically be:
the access network entity analyzes NRI from the P-TMSI and judges whether SGSN with NRI identification exists in at least two SGSNs with highest priority levels selected from a preset SGSN state table, if the SGSN with the NRI identification exists in the SGSN, the access network entity can send a request message to the SGSN with the NRI identification to complete the registration of the mobile terminal; if the current SGSN does not exist, the access network entity can send a request message to a corresponding SGSN in the at least two SGSNs with the highest priority levels according to the preset capacity ratio of the at least two SGSNs with the highest priority levels so as to complete the registration of the mobile terminal; or, the access network entity may send the request message to the least accessed mobile terminal in at least two SGSNs with the highest priority level, so as to complete the registration of the mobile terminal.
As an alternative implementation, the method described in fig. 2 may further include the following steps:
and the access network entity receives a registration completion response message returned by the SGSN with the highest priority level and sends the registration completion response message to the mobile terminal to complete the registration of the mobile terminal.
The registration completion response message may be an Attach Accept message Attach Accept, or a router update completion response message, which is not limited in the embodiment of the present invention.
The registration completion response message is sent by the SGSN with the highest priority after verifying that the identity information carried in the Request message (e.g., Attach Request) sent by the mobile terminal is correct (i.e., verifying that the identity of the mobile terminal is correct), and the registration completion response message (e.g., Attach Accept message Attach Accept) is intended to confirm that the mobile terminal is successfully attached.
As an optional implementation manner, in the above method provided in this embodiment of the present invention, after the access network entity performs step 201, the following steps may also be performed first:
the access network entity detects whether the preferred SGSN function is started, if the preferred SGSN function is started, the access network entity executes the steps 202-203 again; if the preferred SGSN function is not turned on, the access network entity may send a Request message (e.g., Attach Request) to the corresponding SGSN according to the preconfigured SGSN capacity ratio to complete the registration of the mobile terminal. Accordingly, the mobile terminal may further receive a registration completion response message (e.g., Attach Accept message Attach Accept) returned by the corresponding SGSN, and send the registration completion response message (e.g., Attach Accept message Attach Accept) to the mobile terminal, thereby completing the registration of the mobile terminal. The corresponding SGSN may be an SGSN corresponding to the access network entity, or may be another SGSN, which is not limited in the embodiment of the present invention.
In the method provided by the embodiment of the present invention, the access network entity may further detect the state of each SGSN in the Pool area, and if it is detected that a certain SGSN is normal, it indicates that the SGSN may participate in the selection of the access network entity for the SGSN, and the SGSN and its priority level may be written into the SGSN state table, thereby forming the SGSN state table. Otherwise, if a certain SGSN is detected to be abnormal, the SGSN does not participate in selection of the SGSN by the access network entity, and the SGSN does not need to be written in the state table.
As an optional implementation, the access network entity detects the state of each SGSN in the Pool area, and forms a SGSN state table as follows:
the access network entity sends a detection signaling to each SGSN in the Pool area, detects whether a detection signaling response returned by the SGSN in the Pool area aiming at the detection signaling is received or not within a preset time, if so, determines that the SGSN returning the detection signaling response is normal, and writes the SGSN returning the detection signaling response and the priority level thereof into an SGSN state table; if not, determining that the SGSN which does not return the detection signaling response is abnormal without writing the SGSN into the state table.
After the access network entity sends the detection signaling, if a detection signaling response returned by a certain SGSN is received within the preset time, the SGSN is normal, and the SGSN can be selected by the access network entity; otherwise, the SGSN is abnormal, and the SGSN does not need to participate in the selection of the access network entity to the SGSN.
Or, the access network entity may set a time period T in units of minutes, and the access network entity sends a probe signaling to a certain SGSN every time period T, and if the probe signaling sent continuously N times does not receive a probe signaling response returned by the SGSN, or M times (M < N) of the probe signaling sent continuously N times do not receive a probe signaling response returned by the SGSN, the SGSN is considered to be abnormal; otherwise, the SGSN is considered normal, and the SGSN may participate in selection of the SGSN by the access network entity.
In practical application, the access network entity may periodically send a probe signaling to each SGSN in the Pool area, or may send a probe signaling to each SGSN in the Pool area by event triggering, which is not limited in the embodiment of the present invention.
As another optional implementation, the access network entity detects the state of each SGSN in the Pool area, and forms a SGSN state table as follows:
an access network entity receives a broadcast message sent by any SGSN in a Pool area, wherein the broadcast message is used for indicating that the SGSN is abnormal; the access network entity determines that the rest SGSNs except the SGSN in the Pool area are normal, and writes the rest SGSNs and the priority level thereof into an SGSN state table. Wherein, the SGSN exception includes a failure of the SGSN itself, and/or an unavailability of a Gr interface between the SGSN and the HLR, and/or an unavailability of a 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 may select the SGSN with the highest priority from the SGSN status table, and send the request message to the SGSN with the highest priority to complete the registration of the mobile terminal. Therefore, the first embodiment of the present invention can improve the flexibility of SGSN selection, and particularly, 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 SGSN with the least access number of mobile terminals can be selected for the mobile terminal to register, thereby improving the flexibility of SGSN selection.
Example two:
referring to fig. 3, fig. 3 is a flowchart of several methods for registering a mobile terminal in a Pool area according to a second embodiment 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 in the embodiment of the present invention is described by taking RNC as an access network entity as an example. The specific implementation process of the mobile terminal registration method in the Pool area when the BSC serves as the access network entity is similar to that in fig. 3, and therefore, the second embodiment of the present invention is not repeated. In the method described in fig. 3, the RNC may exclude the SGSN with the abnormal condition in the Pool area, start the preferred SGSN function, and record the SGSN capacity ratio and/or the number of times of mobile terminal accesses with the same priority level (the SGSN capacity ratio and/or the number of times of mobile terminal accesses may also be regarded as the SGSN weight). In addition, when the SGSN in the Pool area determines that the Gr interface is not available and/or the Gn interface is not available, the SGSN may also notify the RNC that the SGSN is abnormal.
As shown in fig. 3, a method for registering a mobile terminal in a Pool area is implemented as follows:
11. and the mobile terminal UE sends an Attach Request message Attach Request carrying the IMSI to the RNC.
12. The RNC selects the SGSN2 with normal state and highest priority from the SGSN state table; the SGSN2 with the highest priority level is an SGSN corresponding to the RNC (i.e., a local SGSN accessed by the RNC).
13. The RNC sends an Attach Request message Attach Request carrying the IMSI to the SGSN 2.
14. The RNC receives the Attach Accept message Attach Accept returned by the SGSN 2.
The Attach Accept message Attach Accept returned by the SGSN2 carries the P-TMSI allocated by the SGSN2 to the mobile terminal UE, where the P-TMSI includes the NRI of the SGSN 2.
15. And the RNC sends an Attach Accept message Attach Accept returned by the SGSN2 to the mobile terminal UE to complete the registration of the mobile terminal UE.
As shown in fig. 3, the implementation process of the mobile terminal registration method in another Pool area is as follows:
21. and the mobile terminal UE sends an Attach Request message Attach Request carrying the P-TMSI to the RNC.
The P-TMSI carried in the Attach Request message Attach Request is allocated by the SGSN2 to the mobile terminal UE, and the P-TMSI includes the NRI of the SGSN 2.
22. The RNC selects the SGSN2 with the highest priority from the SGSN state table; the SGSN2 having the highest priority level is an SGSN corresponding to the RNC.
Here, since the RNC selects only one SGSN2 with the highest priority from the SGSN status table, the NRI of the SGSN2 included in the P-TMSI transmitted by the UE does not work.
23. The RNC sends an Attach Request message Attach Request carrying the P-TMSI to the SGSN 2.
24. The RNC receives the Attach Accept message Attach Accept returned by the SGSN 2.
25. And the RNC sends an Attach Accept message Attach Accept returned by the SGSN2 to the mobile terminal UE to complete the registration of the mobile terminal UE.
As shown in fig. 3, the implementation process of the mobile terminal registration method in another Pool area is as follows:
31. and the mobile terminal UE sends an Attach Request message Attach Request carrying the P-TMSI to the RNC.
The P-TMSI carried in the Attach Request message Attach Request is allocated by the SGSN2 to the mobile terminal UE, and the P-TMSI includes the NRI of the SGSN 2.
32. The RNC selects the SGSN1 with the highest priority from the SGSN state table; here, the SGSN2 corresponding to the RNC is abnormal.
Here, since the RNC selects only one SGSN1 with the highest priority from the SGSN status table, the NRI of the SGSN2 included in the P-TMSI transmitted by the UE does not work.
33. The RNC sends an Attach Request message Attach Request carrying the P-TMSI to the SGSN 1.
34. The RNC receives the Attach Accept message Attach Accept returned by the SGSN 1.
The Attach Accept message Attach Accept returned by the SGSN1 carries the P-TMSI allocated by the SGSN1 to the mobile terminal UE, where the P-TMSI includes the NRI of the SGSN 1.
35. And the RNC sends an Attach Accept message Attach Accept returned by the SGSN1 to the mobile terminal UE to complete the registration of the mobile terminal UE.
The second embodiment of the invention can improve the flexibility of SGSN selection, especially when the SGSN corresponding to the RNC is abnormal, the SGSN closest to the SGSN corresponding to the RNC can be selected for the mobile terminal or the SGSN with the least access quantity of the mobile terminal is registered, thereby improving the flexibility of SGSN selection.
Example three:
referring to fig. 4, fig. 4 is a flowchart of several methods for registering a mobile terminal in a Pool area according to a third embodiment 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 in the embodiment of the present invention is described by taking RNC as an access network entity as an example. The specific implementation process of the mobile terminal registration method in the Pool area when the BSC serves as the access network entity is similar to that in fig. 4, and therefore, the third embodiment of the present invention is not repeated. In the method described in fig. 3, the RNC may exclude the SGSN with the abnormal condition in the Pool area, and turn on the preferred SGSN function and record the SGSN capacity ratio and/or the number of times of mobile terminal accesses with the same priority level (the SGSN capacity ratio and/or the number of times of mobile terminal accesses may be regarded as the SGSN weight). In addition, when the SGSN in the Pool area determines that the Gr interface is not available and/or the Gn interface is not available, the SGSN may also notify the RNC that the SGSN is abnormal.
As shown in fig. 4, a method for registering a mobile terminal in a Pool area is implemented as follows:
41. and the mobile terminal UE sends an Attach Request message Attach Request carrying the P-TMSI to the RNC.
The P-TMSI carried in the Attach Request message Attach Request is allocated by the SGSN2 to the mobile terminal UE, and the P-TMSI includes the NRI of the SGSN 2.
42. The RNC selects the SGSN1 with the highest priority from the SGSN state table; here, the SGSN2 corresponding to the RNC is abnormal.
43. The RNC sends an Attach Request message Attach Request carrying the P-TMSI to the SGSN 1.
Here, since the RNC selects only one SGSN1 with the highest priority from the SGSN status table, the NRI of the SGSN2 included in the P-TMSI transmitted by the UE does not work.
44. The RNC receives the Attach Accept message Attach Accept returned by the SGSN 1.
The Attach Accept message Attach Accept returned by the SGSN1 carries the P-TMSI allocated by the SGSN1 to the mobile terminal UE, where the P-TMSI includes the NRI of the SGSN 1.
45. And the RNC sends an Attach Accept message Attach Accept returned by the SGSN1 to the mobile terminal UE to complete the registration of the mobile terminal UE.
As shown in fig. 4, the implementation process of the mobile terminal registration method in another Pool area is as follows:
51. and the mobile terminal UE sends an Attach Request message Attach Request carrying the P-TMSI to the RNC.
The P-TMSI carried in the Attach Request message Attach Request is allocated by the SGSN1 to the mobile terminal UE, and the P-TMSI includes the NRI of the SGSN 1.
52. The RNC selects the SGSN2 with the highest priority from the SGSN state table;
the RNC detects that the SGSN2 corresponding to the RNC is recovered to normal by the above-described method, and the RNC writes the SGSN2 and its priority level into the SGSN status table, where the SGSN2 has the highest priority level.
53. The RNC sends an Attach Request message Attach Request carrying the P-TMSI to the SGSN 2.
Here, since the RNC selects only one SGSN2 with the highest priority from the SGSN status table, the NRI of the SGSN1 included in the P-TMSI transmitted by the UE does not work.
54. The RNC receives the Attach Accept message Attach Accept returned by the SGSN 2.
The Attach Accept message Attach Accept returned by the SGSN2 carries the P-TMSI allocated by the SGSN2 to the mobile terminal UE, where the P-TMSI includes the NRI of the SGSN 2.
55. And the RNC sends an Attach Accept message Attach Accept returned by the SGSN2 to the mobile terminal UE to complete the registration of the mobile terminal UE.
The third embodiment of the invention can improve the flexibility of SGSN selection, especially when the SGSN corresponding to the RNC is abnormal, the SGSN closest to the SGSN corresponding to the RNC can be selected for the mobile terminal or the SGSN with the least access quantity of the mobile terminal is registered, thereby improving the flexibility of SGSN selection.
Example four:
referring to fig. 5, fig. 5 is a structural diagram of an access network entity according to a fourth embodiment of the present invention, which is applied to a Pool area. The access network entity provided in the fourth embodiment of the present invention may be an RNC or a BSC, which is not limited in the embodiments of the present invention. As shown in fig. 5, the access network entity may include:
a first unit 501, configured to receive a request message sent by a mobile terminal, where the request message carries identity information of the mobile terminal, and the request message is used to request for registration of the mobile terminal.
Wherein, the request message includes an attach request message and/or a router update request message.
A second unit 502, configured to select an SGSN with a normal state and a highest priority level from the SGSN status table.
The SGSN with the highest priority level may 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 the SGSN with the least mobile terminal access number, or another SGSN, and the embodiment of the present invention is not limited.
The distance may be a physical distance or a routing distance, and the embodiment of the present invention is not limited.
A third unit 503, configured to send the request message to the SGSN with the highest priority level, so as to complete registration of the mobile terminal.
As an optional implementation manner, the first unit 501 may be further configured to receive a registration completion response message returned by the SGSN with the highest priority level;
correspondingly, the access network entity shown in fig. 5 may further include a fourth unit 504, configured to send the registration completion response message to the mobile terminal, so as to complete the registration of the mobile terminal.
In this embodiment of the present invention, the second unit 502 may store an SGSN status table for recording the SGSN with a normal status and its priority level. For example, when the SGSN corresponding to the access network entity is abnormal, the SGSN with the highest priority level may be the SGSN closest to the SGSN corresponding to the access network entity, or may be the SGSN with the least number of mobile terminals accessed. 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 may be one or at least two; likewise, the number of SGSNs with the smallest number of mobile terminal accesses may be one or at least two. That is, when the SGSN corresponding to the access network entity is abnormal, the number of SGSNs with the highest priority level selected by the second unit 502 from the SGSN status 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 from the SGSN status table by the second unit 502 may be the SGSN corresponding to the access network entity, so that the mobile terminal may prefer the SGSN corresponding to the access network entity to perform registration. Obviously, if the SGSN with the highest priority selected by the second unit 502 from the SGSN status table is the SGSN corresponding to the access network entity, the number of SGSNs with the highest priority selected by the second unit 502 from the SGSN status table is one.
Optionally, in the SGSN status table stored in the second unit 502, for each SGSN with a normal status, the corresponding capacity, the access frequency of the mobile terminal, the access failure frequency and reason of the mobile terminal within a certain time, and the like may also be recorded, which is not limited in the embodiment of the present invention.
As an alternative, the identification information of the mobile terminal may be the IMSI of the mobile terminal.
As mentioned above, the number of the SGSNs with the highest priority level selected by the second unit 502 from the SGSN status table may be at least two, and then when the identification information of the mobile terminal is the IMSI of the mobile terminal, the third unit 503 is specifically configured to send a request message to a corresponding SGSN of the at least two SGSNs with the highest priority level according to the preconfigured capacity ratio of the at least two SGSNs with the highest priority level, so as to complete the registration of the mobile terminal; or the mobile terminal registration server is used for sending the request message to the mobile terminal with the least access number in the at least two SGSNs with the highest priority levels so as to complete the registration of the mobile terminal.
As an alternative, the identification 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 status table may be at least two, and when the identification information of the mobile terminal is the P-TMSI of the mobile terminal, the structure diagram of the third unit 503 may be as shown in fig. 6, including:
a first module 5031, configured to parse out an NRI from the P-TMSI carried in the request message;
a second module 5032, configured to determine whether an SGSN with an NRI identifier exists in the SGSNs with the highest priority selected from the SGSN status table;
a third module 5033, configured to send a request message to the SGSN identified by the NRI to complete registration of the mobile terminal when the determination result of the second module 5032 is yes.
As an alternative embodiment, the third unit 503 may further include a fourth module 5034:
a fourth module 5034, configured to send a request message to a corresponding SGSN of the at least two SGSNs with the highest priority level according to a preconfigured capacity ratio of the at least two SGSNs with the highest priority level when the determination result of the second module 5032 is negative, so as to complete registration of the mobile terminal; or the mobile terminal registration server is used for sending the request message to the mobile terminal with the least access number in the at least two SGSNs with the highest priority levels so as to complete the registration of the mobile terminal.
For example, assuming that the second unit 502 selects the SGSN with normal status and the highest priority level from the SGSN status table, including SGSNI and SGSN3, where the SGSNI and SGSN3 have the same priority level, and the capacity ratio of SGSNI to SGSN3 is 2: 3, the second module 5032 may randomly generate a random number n and perform a modulo-5 (5 ═ 2+3) operation on the random number n when determining that there is no SGSN identified by the NRI analyzed by the first module in the SGSNI and SGSN3, and if the operation result is within a range of (0-1), the fourth module 5034 may send the request message to SGSN1 for registration; if the operation result is within the range of (2-4), the fourth module 5034 may send a request message to the SGSN3 for registration.
Referring 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 fig. 6, the access network entity shown in fig. 7 further includes:
a fifth unit 505, configured to detect whether the SGSN function is turned on 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 SGSN with the highest priority level and a normal state from a preset SGSN state table; if not, sending the request message to the corresponding SGSN according to the preconfigured SGSN capacity ratio so as to complete the registration of the mobile terminal;
correspondingly, the first unit 501 is further configured to receive a registration completion response message returned by the corresponding SGSN;
the fifth unit 505 is further configured to send a registration completion response message returned by the corresponding SGSN to the mobile terminal, so as to complete the registration of the mobile terminal.
Referring 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 fig. 7, the access network entity shown in fig. 8 further includes:
a sixth unit 506, configured to send a 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 so, determine that the SGSN returning the probe signaling response is normal, and write the SGSN returning the probe signaling response and its priority level into an SGSN status table; if not, determining that the SGSN which does not return the detection signaling response is abnormal.
Referring 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 fig. 7, the access network entity shown in fig. 9 further includes:
a seventh unit 507, configured to receive a broadcast message sent by any SGSN in the Pool area, where the broadcast message is used to indicate that the SGSN is abnormal; wherein the SGSN exception may include that a Gr interface of the SGSN is not available, a Gn interface is not available, and the like; and determining that the rest SGSNs except the SGSN in the Pool area are normal, and writing the rest SGSNs and the priority level thereof into an SGSN state table.
In the access network entity provided by the embodiment of the invention, after receiving the request message sent by the mobile terminal, the SGSN with the highest priority level can be selected from the SGSN state table, and the request message is sent to the SGSN with the highest priority level, so as to complete the registration of the mobile terminal. Therefore, the embodiment of the 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 can be selected for the mobile terminal or the SGSN with the least access number of the mobile terminal is registered, and the flexibility of SGSN selection is improved.
Example five:
referring to fig. 10, fig. 10 is a diagram illustrating a system for registering a mobile terminal in a Pool area according to an embodiment of the present invention. As shown in fig. 10, the system may include:
at least one mobile terminal 1001 and an access network entity 1002;
the mobile terminal 1001 is configured to send a request message to the access network entity 1002, where the request message carries identity information of the mobile terminal 1001, and the request message is used to request for mobile terminal registration.
Wherein the request message comprises an attach request message and/or a router update request message.
The mobile terminal 1001 may further receive a registration completion response message sent by the access network entity 1002, and complete the registration of the mobile terminal 1001.
The access network entity 1002 may be an RNC or a BSC.
The structure and function of the access network entity 1002 are the same as those of any one of the access network entities in fig. 5 to 9, and the embodiment of the present invention is not repeated.
Wherein the dashed line between the mobile terminal 1001 and the access network entity 1002 represents a radio connection.
The system provided by the embodiment of the invention can improve the flexibility of SGSN selection, particularly can select the SGSN closest to the SGSN corresponding to the access network entity for the mobile terminal or the SGSN with the least access quantity of the mobile terminal for registration when the SGSN corresponding to the access network entity is abnormal, and improves the flexibility of SGSN selection.
In the embodiment of the invention, after the local SGSN is abnormal, the RNC can register the SGSN with the best Pool area closest to the SGSN corresponding to the RNC or the SGSN with the least mobile terminal access frequency for the mobile terminal without performing alternate selection of other SGSNs.
In the embodiment of the invention, after the SGSN corresponding to the RNC is recovered to be 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 realize the migration of all the mobile terminals, and can solve the defect that the RNC in the existing Pool area can not successfully migrate the user which is not attached in the migration flow, thereby realizing the migration of 100 percent of the users,
in the embodiment of the invention, as the SGSN can be provided with some cells transmitted to the GGSN, the flexible transmission to the GGSN such as charging attribute policy (CC), the Time Zone (TZ) of the SGSN and the parameter values of different quality of service (QoS) are indirectly realized, and the greater reliability of the service is ensured.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The method and system for registering a mobile terminal in a Pool area and the access network entity provided by the embodiment of the invention are described in detail, a specific example is applied in the text to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (17)
1. A method for registering a mobile terminal in a Pool area is characterized by comprising the following steps:
an access network entity receives a request message sent by a mobile terminal, wherein the request message carries identity identification information of the mobile terminal, and the request message is used for requesting mobile terminal registration; the identity identification information comprises an International Mobile Subscriber Identity (IMSI) or a temporary mobile subscriber identity (P-TMSI);
the access network entity selects the SGSN with normal state and highest priority level from the general packet radio service support node SGSN state table; the number of the SGSN with the highest priority level is at least two;
if the identity identification information comprises an International Mobile Subscriber Identity (IMSI), the access network entity sends the request message to a corresponding SGSN in the at least two SGSNs with the highest priority levels according to the preconfigured capacity ratio of the at least two SGSNs with the highest priority levels so as to complete the registration of the mobile terminal; or, the access network entity sends the request message to the user with the least number of mobile terminals in the at least two SGSNs with the highest priority level, so as to complete the registration of the mobile terminal; or,
if the identity identification information comprises a temporary mobile subscriber identity (P-TMSI), the access network entity analyzes a Network Resource Identifier (NRI) from the P-TMSI; and the access network entity judges whether SGSN with the NRI mark exists in the SGSN with the highest priority level, and if the SGSN with the NRI mark exists in the SGSN with the highest priority level, the request message is sent to the SGSN with the NRI mark so as to complete the registration of the mobile terminal.
2. The mobile terminal registration method of claim 1, further comprising:
the access network entity receives a registration completion response message returned by the SGSN with the highest priority level;
and the access network entity sends the registration completion response message to the mobile terminal to complete the registration of the mobile terminal.
3. The method of 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, or the SGSN with the least number of mobile terminals.
4. The mobile terminal registration method of claim 1, further comprising:
if there is no SGSN with NRI mark in the at least two SGSNs with highest priority level, the access network entity sends the request message to the corresponding SGSN in the at least two SGSNs with highest priority level according to the pre-configured capacity ratio of the at least two SGSNs with highest priority level so as to complete the registration of the mobile terminal;
or, the access network entity sends the request message to the minimum number of mobile terminals in the at least two SGSNs with the highest priority level, so as to complete the registration of the mobile terminals.
5. The method for registering a mobile terminal according to any of claims 1 to 4, wherein after the access network entity receives the request message sent by the mobile terminal, the method further comprises:
the access network entity detects whether the preferred SGSN function is started, if so, the access network entity executes the step of selecting the SGSN with the normal state and the highest priority level from the SGSN state table.
6. The mobile terminal registration method of claim 5, further comprising:
and if the preferred SGSN function is not started, the access network entity sends the request message to the corresponding SGSN according to the preset SGSN capacity ratio so as to complete the registration of the mobile terminal.
7. The mobile terminal registration method according to any of claims 1 to 4, further comprising:
the access network entity sends a detection signaling to each SGSN in the Pool area;
and the access network entity detects whether a detection signaling response returned by the SGSN in the Pool area aiming at the detection signaling is received within a preset time, if so, the SGSN returning the detection signaling response is determined to be normal, and the SGSN returning the detection signaling response and the priority level thereof are written into the SGSN state table.
8. The mobile terminal registration method according to any of claims 1 to 4, further comprising:
the access network entity receives a broadcast message sent by any SGSN in the Pool area, wherein the broadcast message is used for indicating that any SGSN is abnormal;
and the access network entity determines that the rest SGSNs except any SGSN in the Pool area are normal, and writes the rest SGSNs and the priority levels thereof into the SGSN state table.
9. An access network entity applied to Pool area, comprising:
a first unit, 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 for requesting mobile terminal registration; the identity identification information comprises an International Mobile Subscriber Identity (IMSI) or a temporary mobile subscriber identity (P-TMSI);
a second unit, configured to select an SGSN with a normal state and a highest priority level from a gprs support node SGSN status table; the number of the SGSN with the highest priority level is at least two;
the access network entity further comprises: 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 a corresponding SGSN of the at least two SGSNs with the highest priority level according to a preconfigured capacity ratio of the at least two SGSNs with the highest priority level, so as to complete registration of the mobile terminal; or, sending the request message to the user with the least mobile terminal access number in the at least two SGSNs with the highest priority level to complete the registration of the mobile terminal;
or, if the id information includes a temporary mobile subscriber identity, P-TMSI, the third unit includes: a first module, configured to parse a network resource identifier NRI from the P-TMSI; a second module, configured to determine whether an SGSN identified by the NRI exists in the at least two SGSNs with the highest priority level; a third module, configured to send the request message to the SGSN identified by the NRI to complete registration of the mobile terminal when the determination result of the second module is yes.
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 level;
the access network entity further comprises:
a fourth unit, configured to send the registration completion response message to the mobile terminal, so as to complete registration of the mobile terminal.
11. The access network entity according to claim 9 or 10, wherein the SGSN with the highest priority level is the SGSN corresponding to the access network entity, or the SGSN closest to the SGSN corresponding to the access network entity, or the SGSN with the least number of mobile terminal accesses.
12. The access network entity of claim 11, wherein the third unit further comprises:
a fourth module, configured to send the request message to a corresponding SGSN of the at least two SGSNs with the highest priority level according to a preconfigured capacity ratio of the at least two SGSNs with the highest priority level when a determination result of the second module is negative, so as to complete registration of the mobile terminal; or sending the request message to the user with the least mobile terminal access number in the at least two SGSNs with the highest priority levels to complete the registration of the mobile terminal.
13. The access network entity according to claim 9 or 10, further comprising:
a fifth unit, configured to detect whether a function of a preferred gprs support node SGSN is turned on after the first unit receives the request message sent by the mobile terminal, and if so, notify the second unit to select an SGSN with a highest priority level and a normal state from the SGSN status table.
14. The access network entity of claim 13,
if the preferred SGSN function is not detected to be turned on, the fifth unit is further configured to send the request message to a corresponding SGSN according to a preconfigured SGSN capacity ratio, 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 a 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 so, determine that the SGSN returning the probe signaling response is normal, and write the SGSN returning the probe signaling response and its priority level 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 the any SGSN is abnormal; and determining that the rest SGSNs except any SGSN in the Pool area are normal, and writing the rest SGSNs and the priority levels thereof into the SGSN state table.
17. An access network entity according to claim 9 or 10, characterized in that the access network entity comprises a radio network controller, RNC, or a base station controller, BSC.
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