CN100397941C - Locating Method for Roaming Target User in Location Service - Google Patents

Abstract

The invention discloses a method for locating a roaming target user in a location service, which is characterized in that the method comprises the following steps: A) after receiving a request for locating the target user, the Home-LSP to which the roaming target user belongs sends a The home location register HLR sends a search route message based on SS7, and the HLR searches for the routing information of the target user, and returns a routing information return message based on SS7 to the Home-LSP, which carries the current roaming target user The mobile switching center identifies the MSCID, B) initiates a positioning session initialization message based on No. The corresponding relationship of the receiver obtains the relevant data required for positioning, and obtains the positioning information of the roaming target user. The invention solves the problem of low positioning efficiency in the prior art.

Description

Locating Method for Roaming Target User in Location Service

technical field

The invention relates to the location service technology in the mobile field, specifically, the invention relates to a method for locating a roaming target user in the location service.

Background technique

Under the premise of not changing the existing second-generation (2G) system, the location service based on the Assisted Global Positioning System (AGPS) technology to be launched at present is based on the transmission of the application layer. The Development Mobile Alliance (OMA) organization has proposed a reliable The User Plane Location (SUPL, Secure User PlaneLocation) specification, which involves a positioning service platform (Visit-LSP) visited by the target user to achieve roaming target user positioning scheme, and the positioning service platform (Home-LSP) to which the target user belongs LSP) implements the roaming target user positioning solution.

Referring to shown in Fig. 1, Fig. 1 has shown the process that realizes roaming target user location by the location service platform (Visit-LSP) that visits, and concrete flow is as follows:

Steps 101-102, the calling user sends a location request (LSP request) to the request location service platform (Request-LSP, Request Location Service Platform) of the service access location through the location service client (LCS Client);

Request-LSP analyzes the received location request, judges that the target user is not a user in the local area, and forwards the location request to the location service platform to which the target user belongs;

Step 103, Home-LSP performs authentication, checks whether the calling user and LCS Client are authorized, sends location session initialization message (LSCINIT, LCS initiation) to Short Message Switching Center (SMSC) after authentication;

Steps 104 to 107, SMSC sends a search routing message SRI For SM (MAP_SEND_ROUTING_INFO_FOR_SHORT MESSAGE) to a home location register (HLR) to search for fixed-label user routing information. After the routing information determines the currently visited MSC, the SMSC sends an LCS initialization message to the MSC, and then The MSC forwards the message to the target user to initiate the positioning session;

Step 108, the target user returns relevant data needed for positioning, such as cell information, etc., to the Home-LSP through a location start request message (SLREQ);

Step 109, the Home-LSP forwards the location request to the location service platform (Visit-LSP) visited by the target user;

Steps 110-112, Visit-LSP establishes a positioning session with the target user, and performs positioning interaction, completes the network-assisted global positioning (AGPS) by selecting, processing, calculating, and pseudo-range correction of local GPS data, and then releases the communication with the target user. location sessions for

In steps 113 to 115, the Visit-LSP returns the location response information to the Home-LSP, and the Home-LSP forwards it to the LCS Client through the Request-LSP to complete the location of the roaming target user.

Referring to Fig. 2, Fig. 2 shows the process of realizing roaming target user location by Home-LSP, wherein,

Step 201 to step 209 are respectively the same as steps 101 to 109 of FIG. 1;

Step 210, after the Visit-LSP receives the location request sent by the Home-LSP, it returns a location request response message to the Home-LSP, and the message carries the cell center information of the visited place;

Steps 211-213, the Home-LSP establishes a positioning session with the target user, and performs positioning interaction, completes the network-assisted global positioning (AGPS) through selection, processing, calculation and pseudo-range correction of the local GPS data, and then releases the network-assisted global positioning (AGPS) with the target user. location sessions for

In steps 214-215, the Home-LSP returns the location response information to the LCS Client via the Request-LSP, and completes the location of the roaming target user.

From the above steps, it can be seen that the process of locating the roaming target user in the prior art is complicated, especially the LCS initialization message can only be sent to the target user after obtaining the routing information of the target user through the SMSC, and the SMSC is a queuing mechanism The server does not have real-time performance at all, so the process of locating the target user is cumbersome and the locating efficiency is low.

Contents of the invention

The purpose of the present invention is to provide a method for locating a roaming target user in a location service, so as to improve the efficiency of locating the roaming target user.

Technical scheme of the present invention is specifically as follows:

A method for locating a roaming target user in a location service, the method comprising the following steps:

A) Home-LSP, the location service platform Home-LSP to which the roaming target user belongs, sends a search routing message based on SS7 to the home location register HLR after receiving the location request of the target user. -LSP returns a routing information return message based on SS7, which carries the current MSC ID of the roaming target user,

B) Initiate a positioning session initialization message based on No. 7 signaling to the current MSC according to the MSC ID, C) establish a positioning session with the roaming target user, perform positioning interaction, and obtain the corresponding relationship between the saved cell information and the GPS reference receiver Relevant data required for locating, and obtaining roaming target user locating information.

Preferably, said step B comprises, after B01) Home-LSP receives the routing information return message that HLR returns, according to the corresponding relationship between MSC ID and area and the corresponding relationship between area and positioning service platform, determine the roaming target user's visit Locate the service platform Visit-LSP, and forward the location request to the Visit-LSP, the location request carries the MSC ID returned by the routing information return message,

B02) The Visit-LSP determines the current MSC according to the MSC ID, and the Visit-LSP sends a positioning session initialization message to the current MSC.

Wherein, the step of establishing a positioning session with the roaming target user in step C includes: after receiving the positioning session initialization message, the roaming target user returns a positioning start request to the current Visit-LSP, and the VIsit-LSP establishes a positioning session with the roaming target user.

The Visit-LSP stores the correspondence between the cell information in the local area and the GPS reference receiver.

Preferably, said step B includes, after the Home-LSP receives the routing information return message returned by the HLR, the Home-LSP determines the current MSC according to the MSC ID, and then directly sends a positioning session initialization message to the MSC. The step of establishing a positioning session with the roaming target user in step C includes: after receiving the positioning session initialization message, the roaming target user returns a positioning start request to the Home-LSP, and the Home-LSP directly establishes a positioning session with the roaming target user.

The Home-LSP stores the corresponding relationship between the cell information of the whole network and the global positioning system reference receiver.

The method for locating the roaming target user proposed by the present invention directly obtains the MSC currently visited by the roaming target user by directly searching for the route to the target user HLR through the message based on the No. The initialization message establishes a positioning session. Compared with the prior art, the present invention bypasses the SMSC, reduces positioning steps, and improves the real-time and efficiency of positioning. Furthermore, the Home-LSP proposed by the present invention realizes the positioning method of the calling user to the roaming target user without the participation of the Visit-LSP, so that the positioning efficiency is further improved.

Description of drawings

FIG. 1 shows the process of realizing roaming target user positioning by a visited location service platform (Visit-LSP) in the prior art.

FIG. 2 shows a process in which a roaming target user is located by a home location service platform (Home-LSP) in the prior art.

FIG. 3 is a network diagram of location services in the current cell.

FIG. 4 shows the process of locating a roaming target user by a calling user through a Visit-LSP in Embodiment 1 of the present invention.

FIG. 5 shows the process of locating the roaming target user by the calling user through the Home-LSP in Embodiment 2 of the present invention.

Fig. 6 shows the process of self-positioning in the present invention.

Detailed ways

The embodiment provided by the present invention can be implemented based on the current location service network of the community. As shown in Figure 3, the location service network includes Visit-LSP, Request-LSP and Home-LSP, and each LSP has an interconnection and intercommunication function. Messages between LSPs are based on the TCP/IP protocol, and each LSP supports the No. 7 signaling function.

Example 1:

This embodiment is based on the fact that the visited LSP has the AGPS positioning capability, and each Visit-LSP stores the correspondence between the cell information in the local area (or the location information identified by other location identification methods) and the GPS reference receiver, and the GPS reference information of the LSPs in each area. It is implemented where the receiver only needs to cover the range of the local area. Obtain the routing information of the target user from the HLR by sending an SRI FOR SM message, thereby obtaining the MSC ID currently visited by the target user, and find the The current Visit-LSP, the Visit-LSP directly sends the LCS initialization message based on SS7 to the currently visited MSC, notifies the target user to initialize the positioning session, then performs positioning interaction, and returns the positioning information to the calling user, thereby Complete roaming target user positioning.

Referring to Fig. 4, Fig. 4 shows the process of locating the roaming target user by the Visit-LSP calling user, and the specific process is as follows:

Step 301, the calling user sends a location request to the Request-LSP of the service access location through the LCS Client, for example, the calling user registered at A places locates the target user through the Request-LSP of the service access location at B location;

Step 302, the Request-LSP parses the message and determines that the target user is not a user in the local area, then forwards the location request to the LSP of the target user's home location;

Step 303, the Home-LSP performs authentication, checks whether the calling user and the LCS Client are authorized, and sends an SRI FOR SM message to the HLR to which the target user belongs after passing the authentication;

Step 304, HLR returns SRI FOR SM response (SRI FOR SMack) to Home-LSP, brings back the current visiting MSC ID of target user;

Step 305, the Home-LSP finds the LSP where the target user roams, i.e. the Visit-LSP, according to the correspondence table between the MSC ID and the area and the correspondence table between the area and the LSP, and forwards the location request to the Visit-LSP, and the request is carried through the SRI FOR MSC ID returned by SM Ack message;

Steps 306-307, Visit-LSP sends LCS initialization message to the MSC according to the returned MSC ID information, and MSC sends the LCS initialization message to the target user;

Step 308, since the visited LSP has AGPS positioning capability, and preserves the corresponding relationship between the cell information in the local area and the GPS reference receiver, and the GPS reference receiver only needs to cover the scope of the local area, the target user returns to the Visit-LSP through the SLREQ message Relevant data required for positioning;

Steps 309-311, Visit-LSP establishes a positioning session with the target user, and conducts positioning interaction, completes the network-assisted global positioning (AGPS) by selecting, processing, calculating, and pseudo-range correction of local GPS data, and then releases the target user to communicate with the target user. location sessions for

In steps 312 to 314, the Visit-LSP returns the location response information to the Home-LSP, and the Home-LSP forwards it to the LCS Client through the Request-LSP to complete the location of the roaming target user.

Comparing Figure 1 and Figure 4 and the above steps, it can be seen that steps 301, 302, and 309 to 314 are the same as steps 101, 102, and 110 to 115 in the prior art respectively, but in this embodiment, Home-LSP and HLR Based on the SRI FOR SM message of SS7 and the SRIFOR SM Ack message to determine the LSP visited by the target user, instead of searching for the route between the SMSC and the HLR, bypassing the SMSC, improving the real-time performance and improving the unit efficiency, and both the SLREQ message and the LCS initialization message are only interacted between the Visit-LSP and the target user, and the total steps of the present invention in the process are reduced by one step compared with the total steps of the prior art, further improving the positioning efficiency.

Example 2:

In this embodiment, the visited LSP does not need to have the AGPS positioning capability, and each Home-LSP stores the corresponding relationship between the cell information of the whole network (or the location information identified by other location identification methods) and the GPS reference receiver, and the home area of the target user The LSP can be implemented under the condition that the GPS data of the whole network can be obtained. Obtain the routing information of the target user from the HLR through the SRI FOR SM message, thereby obtaining the MSC ID currently visited by the target user, and then the Home-LSP directly sends an LCS initialization message based on SS7 to the currently visited MSC to notify the target user The initialization of the positioning session is performed, and then the positioning interaction is performed, so as to complete the positioning of the roaming target user.

Referring to Fig. 5, Fig. 5 shows the positioning process of the calling user to the roaming target user by the Home-LSP, and the specific process is as follows:

Step 401, the calling user sends a location request to the Request-LSP of the service access location through the LCS Client, for example, the calling user registered at A places locates the target user through the Request-LSP of the service access location at B location;

Step 402, the Request-LSP parses the message, and judges that the target user is not a user in the local area, then forwards the location request to the LSP at the location where the target user belongs;

Step 403, the Home-LSP performs authentication, checks whether the calling user and the LCS Client are authorized, and sends an SRI FOR SM message to the HLR to which the target user belongs after passing the authentication;

Step 404, HLR returns SRI FOR SM response (SRI FOR SM Ack) message to Home-LSP, brings back the current visiting MSC ID of target user;

Steps 405-406, the Home-LSP sends an LCS initialization message to the MSC according to the MSC ID returned by the SRI FOR SM Ack, and the MSC sends it to the target user;

Step 407, the target user returns relevant data required for positioning to the Home-LSP through the SLREQ message;

Steps 408-410, since the Home-LSP stores the corresponding relationship between the cell information of the entire network or the location information identified by other location identification methods and the GPS reference receiver, the Home-LSP establishes a positioning session with the target user, and performs positioning interaction, through Select, process, calculate and correct the pseudo-range of local GPS data, complete the network-assisted global positioning, and then release the positioning session with the target user;

Steps 411-412, the Home-LSP returns the location response information to the LCS Client via the Request-LSP, and completes the location of the roaming target user.

Comparing Figure 2 and Figure 5 and the above steps, it can be seen that steps 401, 402, 407, 408 and 408 to 412 are the same as steps 201, 202, 207, 208 and 211 to 215 in the prior art respectively, but in this embodiment Among them, the MSC visited by the target user is determined through the SRI FORSM message and the SRI FOR SM Ack message based on No. 7 signaling between the Home-LSP and the HLR, instead of searching for a route between the SMSC and the HLR, bypassing the SMSC, and improving real-time, and because this embodiment does not need the participation of Visit-LSP, and does not need to perform steps 209 and 210 in the prior art, that is, it is not necessary to interact with the location request between Home-LSP and Visit-LSP, so further Improve positioning efficiency.

Embodiment 1 and Embodiment 2 above describe the method for the calling user to locate the roaming target user. Further, when the calling user is roaming, the calling user can perform its own positioning as the target user, for example, register at A When the user roams to B, he can locate himself. As shown in FIG. 6, FIG. 6 shows the process of performing self-positioning. The specific process is as follows:

Step 601, the target user roaming to B place initiates an SLREQ message to its Home-LSP;

In steps 602-603, the Home-LSP authenticates the request, and returns a positioning start response to the target user after the authentication is passed; and, the Home-LSP interacts with the target user for positioning, by selecting, processing, calculating and Pseudorange correction to complete network-assisted global positioning.

Claims (7)

1. a positioning method to a roaming target user in a position service, it is characterized in that the method comprises the following steps: A) After the home location service platform Home-LSP of the roaming target user receives the location request for the target user, it sends a search routing message based on SS7 to the home location register HLR, and the HLR searches for the routing information of the target user and sends the Home -LSP returns a routing information return message based on SS7, which carries the current MSC ID of the roaming target user, B) initiate a positioning session initialization message based on SS7 to the current MSC according to the MSC ID, C) Establish a positioning session with the roaming target user, perform positioning interaction, obtain the relevant data required for positioning through the corresponding relationship between the saved cell information and the global positioning system reference receiver, and obtain the positioning information of the roaming target user. 2. The method for positioning a roaming target user in a location service according to claim 1, wherein said step B comprises: B01) After the Home-LSP receives the routing information return message returned by the HLR, according to the corresponding relationship between the MSC ID and the region and the corresponding relationship between the region and the location service platform, determine the location service platform Visit-LSP visited by the roaming target user, and report to the location service platform The Visit-LSP forwards the location request, which carries the MSC ID returned by the routing information return message, B02) The Visit-LSP determines the current MSC according to the MSC ID, and the Visit-LSP sends a positioning session initialization message to the current MSC. 3. The method for locating the roaming target user in the location service according to claim 2, wherein the step of establishing a positioning session with the roaming target user in step C comprises, after the roaming target user receives the positioning session initialization message, Return a location start request to the current Visit-LSP, and the Visit-LSP establishes a location session with the roaming target user. 4. The method for locating a roaming target user in a location service according to claim 2, wherein the Visit-LSP stores the corresponding relationship between the cell information in the local area and the GPS reference receiver. 5. The method for locating a roaming target user in a location service according to claim 1, wherein said step B comprises: After the Home-LSP receives the routing information return message returned by the HLR, the Home-LSP determines the current MSC according to the MSC ID, and then directly sends a positioning session initialization message to the MSC. 6. The positioning method for the roaming target user in the location service according to claim 5, wherein the step of establishing a positioning session with the roaming target user in step C comprises, after the roaming target user receives the positioning session initialization message, Return the positioning start request to the Home-LSP, and the Home-LSP directly establishes a positioning session with the roaming target user. 7. The method for locating a roaming target user in a location service according to claim 5, wherein the Home-LSP stores the corresponding relationship between the cell information of the whole network and the reference receiver of the Global Positioning System.

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