CN100505929C - A method for updating routing areas between SGSNs - Google Patents

Abstract

Said invention provides routing area updating method among SGSN. It contains when received mobile users routing area updating request message, said new SGSN obtaining mobile users routing area update information from mobile users side, and according to said information to proceed routing area updating among SGSN. When new SGSN unable obtaining mobile users routing area update information according to protocol regulation from old SGSN side, said invention can complete mobile users SGSN routing area updating through obtaining routing area update information from mobile users side, thereby raising routing area updating success ratio among SGSN.

Description

A method for updating routing areas between SGSNs

technical field

The invention relates to the technical field of wireless communication, in particular to a method for updating routing areas between SGSNs.

Background technique

SGSN (Serving GPRS Support Node) is the core device in the packet domain of GPRS/UMTS (General Packet Radio Service/Universal Mobile Telecommunications System), and the position of SGSN in the mobile communication network is shown in Figure 1.

SGSN mainly completes the routing and forwarding of packet data packets, authentication and encryption, session management, mobility management, logical link management, bill generation and output and other functions.

After the mobile user successfully attaches to the SGSN, in order to regularly update the MM (mobility management) context and maintain the consistency between the mobile user and the state in the network, the mobile user needs to start the periodic routing area update timer regularly, and in the periodic routing area After the update timer expires, the periodic routing area update process is initiated to exchange information with the network to maintain the consistency between the mobile user and the state in the network.

The SGSN is provided with a mobile reachable timer corresponding to the periodic routing area update timer of the mobile user, and the duration of the mobile reachable timer is slightly longer than that of the periodic routing area update timer of the mobile user. The mobile reachable timer restarts after each routing area update of the mobile user. If the mobile user does not initiate the periodic routing area update process until the mobile reachable timer expires, the SGSN considers that the mobile user has lost contact with the network. Contact and implicitly detach the mobile user without notifying the mobile user.

In areas with poor wireless signal coverage or shielded areas without wireless signal coverage, such as mountainous areas, tunnels, and uninhabited areas, the periodic routing area update timer of mobile users often times out, and mobile users cannot initiate periodic routing areas. The information interaction between the update process and the network is performed, so that after the mobile reachable timer of the SGSN expires, the SGSN implicitly separates the mobile user.

After the mobile user is implicitly separated, if the mobile user leaves the area with poor wireless signal coverage or the shielded area without wireless signal coverage, and roams to the routing area to which another SGSN belongs, the mobile user will initiate an inter-SGSN routing area update process. The process of updating the routing area between SGSNs is shown in Fig. 2 .

In Fig. 2, in step 2-1, the mobile user sends a RAURequest message to the new SGSN, requesting to update the routing area.

Go to step 2-2, after the new SGSN determines that the routing area is updated as the inter-SGSN routing area update according to the OLD RAI (old routing area identifier) carried in the RAU Request message, according to the stipulations of the 3GPP agreement, the new SGSN receives the mobile user's After the RAU Request message, send a SGSN ContextRequest (SGSN Context Request) message to the old SGSN, requesting to obtain the routing area update information of the mobile user, such as the International Mobile Subscriber Identity, discontinuous reception parameters, network capability parameters, etc.

To step 2-3, because the mobile user is implicitly separated, the old SGSN cannot obtain the routing area update information of the mobile user according to the P-TMSI (temporary mobile subscriber identity in packet domain) carried in the SGSN ContextRequest message, and the old SGSN sends the new The SGSN sends an SGSN Context Response (SGSN Context Response) message carrying a reason value of "IMSI NotKnown" (International Mobile Subscriber Identity is unknown).

In steps 2-4, after receiving the SGSNContext Response message carrying the reason value of "IMSI Not Known", the new SGSN sends a RAU Reject (routing area update) message carrying the reason value of "Implicitly Detached" to the mobile user. Reject) message prompts the mobile user to re-initiate the SGSN attach process, and this inter-SGSN routing area update process fails.

The success rate of routing area update between SGSNs is a core indicator for measuring the performance of communication equipment, and it is also a KPI (key performance indicator) that many mobile operators focus on.

In areas with poor wireless signal coverage, the existing implementation of inter-SGSN routing area update makes the success rate index of inter-SGSN routing area update low, which cannot meet the requirements of mobile operators and affects mobile operators' satisfaction with communication equipment. .

Contents of the invention

The purpose of the present invention is to provide a method for updating the routing area between SGSNs to achieve the purpose of improving the success rate of updating the routing area between SGSNs.

In order to achieve the above object, a method for updating routing areas between SGSNs provided by the present invention includes:

The new SGSN that receives the routing area update request message of the mobile user obtains the routing area update information of the mobile user from the mobile user side, and performs inter-SGSN routing area update according to the obtained routing area update information.

The method specifically includes: when the new SGSN determines that the mobile user's routing area update information cannot be obtained from the mobile user's old SGSN side, obtaining the mobile user's routing area update information from the mobile user side, and according to The acquired routing area update information is used for inter-SGSN routing area update.

The routing area update information includes: mobile user identity information, MM context related information; the MM context related information includes: discontinuous reception parameters, network capability parameters.

Described method specifically comprises:

a. The new SGSN receives the routing area update request message of the mobile user;

b. When the new SGSN determines that the routing area update information of the mobile user cannot be obtained from the old SGSN side of the mobile user and the routing area update request message carries MM context-related information, obtain the MM context relevant information, and obtain the identity information of the mobile user from the mobile user side;

c. The new SGSN performs an inter-SGSN routing area update according to the acquired MM context related information and identity information.

Described step b specifically comprises:

b1. When the new SGSN determines that the routing area update information of the mobile user cannot be obtained from the old SGSN side of the mobile user and the routing area update request message carries MM context-related information, obtain the MM context Related Information;

b2. The new SGSN acquires the identity information of the mobile user through an identity identification process.

The identity information of the mobile user includes: International Mobile Subscriber Identity Code.

In the step b1, the step in which the new SGSN determines that it cannot obtain the routing area update information of the mobile user from the old SGSN side of the mobile user specifically includes:

When the new SGSN receives the SGSN context response message transmitted by the old SGSN of the mobile user and the cause value is an unknown International Mobile Subscriber Identity code, it determines that the mobile user's ID cannot be obtained from the old SGSN side of the mobile user. routing area update information; or

When the new SGSN cannot obtain the old SGSN address information of the mobile user, it determines that the routing area update information of the mobile user cannot be obtained from the old SGSN side of the mobile user; or

When the new SGSN does not receive the SGSN context response message transmitted by the old SGSN of the mobile user within a predetermined time interval, it determines that the routing area update information of the mobile user cannot be obtained from the old SGSN side of the mobile user.

Described step b2 specifically comprises:

The new SGSN sends an identification request message to the mobile user;

After receiving the identification request message, the mobile user carries its International Mobile Subscriber Identity code in the identification response message and transmits it to the new SGSN;

The new SGSN obtains the international mobile subscriber identity code of the mobile user from the identity recognition response message.

It can be seen from the description of the above technical solution that the present invention obtains the routing area update information of the mobile user from the mobile user side, so that the technical solution of the routing area update between SGSNs can be implemented flexibly. It is stipulated that when the routing area update information of the mobile user is obtained from the old SGSN side of the mobile user, the present invention can also complete the routing area update process between the mobile users between SGSNs, avoiding the failure of the routing area update between SGSNs as much as possible; thus through the present invention The technical scheme provided by the invention realizes the purpose of improving the success rate of routing area update between SGSNs and improving mobile operators' satisfaction with network equipment.

Description of drawings

Fig. 1 is a schematic diagram of networking of GPRS/UMTS;

Fig. 2 is the flow chart of prior art inter-SGSN routing area update;

Fig. 3 is a flow chart one of the routing area update between SGSNs of the present invention;

Fig. 4 is the second flow chart of the routing area update between SGSNs of the present invention;

FIG. 5 is the third flow chart of routing area update between SGSNs in the present invention.

Detailed ways

According to the provisions of the agreement, the new SGSN that receives the routing area update request message of the mobile user needs to obtain the routing area update information of the mobile user from the old SGSN side of the mobile user, such as the international mobile subscriber identity code, discontinuous reception parameters, network Capability parameters, etc., to continue the process of inter-SGSN routing area update. However, in the actual communication system, due to many reasons, the new SGSN is often unable to obtain the routing area update information of the mobile user from the old SGSN side, resulting in the failure of the inter-SGSN routing area update process of the mobile user, and the mobile user needs to attach through the attach process On the new SGSN, as stipulated in the 3GPP protocol, after receiving the RAU Reject message whose cause value is "Implicitly Detached", the mobile user re-initiates the attachment process to attach to the new SGSN.

When the new SGSN cannot obtain the routing area update information of the mobile user from the old SGSN side of the mobile user, if the new SGSN can also obtain the routing area update information of the mobile user through other methods, the inter-SGSN routing area update of the mobile user can continue process, thereby improving the success rate of routing area update between SGSNs.

Therefore, the core of the present invention is: the new SGSN that receives the routing area update request message of the mobile user obtains the routing area update information of the mobile user from the mobile user side, and performs inter-SGSN routing area update according to the obtained information.

The technical solution provided by the present invention will be further described below based on the core idea of the present invention.

In order to follow the 3GPP protocol as much as possible, the new SGSN that receives the routing area update request message of the mobile user in the present invention first needs to judge whether it can obtain the routing area update information of the mobile user from the old SGSN side of the mobile user, if the new SGSN The routing area update information of the mobile user can be obtained from the old SGSN side of the mobile user, that is, if the new SGSN can obtain the routing area update information of the mobile user from the information carried in the SGSN context response message transmitted by the old SGSN, then this The inventive method ends; if the new SGSN cannot obtain the routing area update information of the mobile user from the old SGSN side of the mobile user, for example, the new SGSN cannot receive the old SGSN address information after sending the SGSN context request message because it cannot obtain the address information of the old SGSN. The SGSN Context Response message of SGSN, the SGSN Context Response message that receives cause value as " IMSI NotKnown " etc. can not obtain the routing area update information of this mobile user from the old SGSN side, then the new SGSN in the present invention should obtain from the mobile user The side acquires the routing area update information of the mobile user.

Then, continue the inter-SGSN routing area update process according to the routing area update information obtained from the mobile user side.

The routing area update information in the present invention includes: the identity information of the mobile user and the relevant information of the MM context.

The identity information of the mobile user may be the IMSI of the mobile user.

Since the new SGSN needs to obtain the 3GPP protocol version and encryption algorithm supported by the mobile user according to the network capability parameters of the mobile user, and needs to carry the discontinuous reception parameter when paging the mobile user, the value of the discontinuous reception parameter will directly affect the GPRS/UMTS service of the user, therefore, the MM context-related information of the mobile user should include: discontinuous reception parameters and network capability parameters, etc.

Based on the implementation principle of notifying the network equipment of the current parameter information of the mobile user as much as possible, most of the routing area update request messages sent by the mobile user currently carry the discontinuous reception parameter and network capability parameter information elements of the mobile user.

Therefore, the method for implementing the routing area update between SGSNs in the present invention can be as follows: when the new SGSN receives the routing area update request message of the mobile user, it first needs to judge whether it can obtain the routing of the mobile user from the old SGSN side of the mobile user. Area update information, if the new SGSN can obtain the mobile user's routing area update information from the mobile user's old SGSN side, that is, if the new SGSN can obtain the mobile user's routing area information from the information carried in the SGSN context response message transmitted by the old SGSN If the new SGSN cannot obtain the routing area update information of the mobile user from the old SGSN side of the mobile user, as the new SGSN cannot obtain the address information of the old SGSN, send the SGSN context If the SGSN context response message of the old SGSN cannot be received after the request message, or the SGSN context response message whose cause value is "IMSI NotKnown" is received, the routing area update information of the mobile user cannot be obtained from the old SGSN side, then in the present invention The new SGSN of the new SGSN should judge whether the DRX parameter and the network capability parameter of the mobile user are carried in the routing area update request message received by the mobile user. If the DRX parameter and the network capability parameter of the mobile user are not carried, then The method of the present invention ends; if the discontinuous reception parameter and the network capability parameter of the mobile user are carried, obtain the discontinuous reception parameter and the network capability parameter from the routing area update request message.

Then, the new SGSN obtains the IMSI of the mobile user from the mobile user side through the identification process, and after obtaining the above information, proceeds to the subsequent inter-SGSN routing area update process.

After the mobile user is implicitly separated, if the mobile user leaves the area with poor wireless signal coverage or the shielded area without wireless signal coverage, roams to the routing area to which another SGSN belongs and initiates the inter-SGSN routing area update process, through The above method can successfully complete the inter-SGSN routing area update process.

In areas with poor wireless signal coverage, the present invention can effectively improve the success rate of routing area update between SGSNs, thereby improving mobile operators' satisfaction with communication equipment.

The method for updating the inter-SGSN routing area of the present invention will be described in detail below with reference to accompanying drawings 3, 4 and 5.

In Fig. 3, step 3-1, the mobile user sends a routing area update request message to the new SGSN through the base station subsystem.

In step 3-2, after receiving the routing area update request message, the new SGSN obtains the address of the mobile user's old SGSN from DNS (Domain Name Server), and sends an SGSN context request message to the old SGSN.

Go to step 3-3, the old SGSN receives the routing area update request message sent by the new SGSN, because the mobile user is implicitly separated, etc., the old SGSN cannot provide the new SGSN with the mobile user's IMSI, discontinuous reception parameter and network capability parameter routing area update information, the old SGSN transmits the SGSN context response message with the cause value of IMSI Not Known to the new SGSN.

To step 3-4, when the new SGSN receives the SGSN context response message whose cause value is IMSI Not Known, it judges whether the routing area update request message transmitted by the mobile user carries the discontinuous reception parameter and the network capability parameter. The above-mentioned two parameters are not carried in the area update request message, then the method of the present invention ends; if the above-mentioned two parameters are carried in the routing area update request message, the new SGSN sends an identity request (Identity Request) message to the mobile user, and proceeds to step 3 -5.

In step 3-5, the mobile user receives the identity request message, carries its IMSI in an identity response (Identity Response) message and transmits it to the new SGSN.

Go to step 3-6, the new SGSN obtains the IMSI of the mobile user from the identity recognition response message, and determines whether the security verification process of the mobile user is required according to the pre-configuration, and if security verification is required, the new SGSN performs security verification with the mobile user Verification process, and go to step 3-7 after the security verification is successful; if no security verification is required, go directly to step 3-7.

In steps 3-7, the new SGSN sends a routing area update acceptance (RAU Accept) message to the mobile user.

In step 3-8, after receiving the routing area update acceptance message, the mobile user sends a routing area update completion (RAU Complete) message to the new SGSN. The new SGSN becomes the mobile user's current SGSN.

In Fig. 4, step 4-1, the mobile user sends a routing area update request message to the new SGSN through the base station subsystem.

In step 4-2, after receiving the routing area update request message, the new SGSN obtains the address of the mobile user's old SGSN from DNS (Domain Name Server), and sends an SGSN context request message to the old SGSN.

Go to step 4-3, the new SGSN judges whether the SGSN context response message of the old SGSN is received within the predetermined time interval, if the new SGSN determines that the SGSN context response message of the old SGSN has not been received within the predetermined time interval, go to step 4- 4.

In step 4-4, the new SGSN judges whether the routing area update request message transmitted by the mobile user carries the discontinuous reception parameter and the network capability parameter, if the above two parameters are not carried in the routing area update request message, the method of the present invention End; if the above two parameters are carried in the routing area update request message, the new SGSN sends an identity identification request message to the mobile user, and proceeds to step 4-5.

In step 4-5, the mobile user receives the identification request message, carries its IMSI in the identification response message and transmits it to the new SGSN.

Go to step 4-6, the new SGSN obtains the IMSI of the mobile user from the identity recognition response message, and determines whether the security verification process of the mobile user is required according to the pre-configuration, and if security verification is required, the new SGSN performs security verification with the mobile user Verification process, and go to step 4-7 after the security verification is successful; if no security verification is required, go directly to step 4-7.

In steps 4-7, the new SGSN sends a routing area update acceptance message to the mobile user.

In step 4-8, after receiving the routing area update acceptance message, the mobile user sends a routing area update completion message to the new SGSN. The new SGSN becomes the mobile user's current SGSN.

In Fig. 5, step 5-1, the mobile user sends a routing area update request message to the new SGSN through the base station subsystem.

Go to step 5-2, the new SGSN receives the routing area update request message, and when it is determined that the address of the old SGSN of the mobile user cannot be obtained from the DNS, go to step 5-3.

In step 5-3, the new SGSN judges whether the routing area update request message transmitted by the mobile user carries the discontinuous reception parameter and the network capability parameter, if the above two parameters are not carried in the routing area update request message, the method of the present invention End; if the above two parameters are carried in the routing area update request message, the new SGSN sends an identity identification request message to the mobile user, and proceeds to step 5-4.

In step 5-4, the mobile user receives the identity identification request message, carries its IMSI in the identity identification response message and transmits it to the new SGSN.

Go to step 5-5, the new SGSN obtains the IMSI of the mobile user from the identity recognition response message, and determines whether the security verification process of the mobile user is required according to the pre-configuration, and if security verification is required, the new SGSN performs security verification with the mobile user Verification process, and go to step 5-6 after the security verification is successful; if no security verification is required, go directly to step 5-6.

In step 5-6, the new SGSN sends a routing area update acceptance message to the mobile user.

In step 5-7, after receiving the routing area update acceptance message, the mobile user sends a routing area update completion message to the new SGSN. The new SGSN becomes the mobile user's current SGSN.

Although the present invention has been described by way of example, those of ordinary skill in the art know that there are many variations and changes in the present invention without departing from the spirit of the invention, and the claims of the application document of the present invention include these variations and changes.

Claims (8)

1. A method for updating routing areas between SGSNs, comprising: The new SGSN that receives the routing area update request message of the mobile user obtains the routing area update information of the mobile user from the mobile user side, and performs inter-SGSN routing area update according to the obtained routing area update information. 2. The method for updating a routing area between SGSNs according to claim 1, characterized in that the method specifically comprises: the new SGSN determines that the mobile user's route cannot be obtained from the mobile user's old SGSN side When updating area update information, obtain the routing area update information of the mobile user from the mobile user side, and perform inter-SGSN routing area update according to the obtained routing area update information. 3. The method for updating a routing area between SGSNs according to claim 2, wherein the routing area update information includes: mobile user identity information, MM context-related information; the MM context-related information includes : Discontinuous reception parameters, network capability parameters. 4. The method for updating a routing area between SGSNs according to claim 3, wherein said method specifically comprises: a. The new SGSN receives the routing area update request message of the mobile user; b. When the new SGSN determines that the routing area update information of the mobile user cannot be obtained from the old SGSN side of the mobile user and the routing area update request message carries MM context-related information, obtain the MM context relevant information, and obtain the identity information of the mobile user from the mobile user side; c. The new SGSN performs an inter-SGSN routing area update according to the acquired MM context related information and identity information. 5. The method for updating a routing area between SGSNs according to claim 4, wherein said step b specifically comprises: b1. When the new SGSN determines that the routing area update information of the mobile user cannot be obtained from the old SGSN side of the mobile user and the routing area update request message carries MM context-related information, obtain the MM context Related Information; b2. The new SGSN acquires the identity information of the mobile user through an identity identification process. 6. The method for updating the routing area between SGSNs according to claim 5, characterized in that the identity information of the mobile user includes: an International Mobile Subscriber Identification Code. 7. A method for inter-SGSN routing area update according to claim 5, characterized in that in said step b1, the new SGSN determines that it cannot obtain the routing area update of the mobile user from the old SGSN side of the mobile user The information steps specifically include: When the new SGSN receives the SGSN context response message transmitted by the old SGSN of the mobile user and the cause value is an unknown International Mobile Subscriber Identity code, it determines that the mobile user's ID cannot be obtained from the old SGSN side of the mobile user. routing area update information; or When the new SGSN cannot obtain the old SGSN address information of the mobile user, it determines that the routing area update information of the mobile user cannot be obtained from the old SGSN side of the mobile user; or When the new SGSN does not receive the SGSN context response message transmitted by the old SGSN of the mobile user within a predetermined time interval, it determines that the routing area update information of the mobile user cannot be obtained from the old SGSN side of the mobile user. 8. A method for updating an inter-SGSN routing area according to claim 5, wherein said step b2 specifically comprises: The new SGSN sends an identification request message to the mobile user; After receiving the identification request message, the mobile user carries its International Mobile Subscriber Identity code in the identification response message and transmits it to the new SGSN; The new SGSN obtains the international mobile subscriber identity code of the mobile user from the identity recognition response message.

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