CN1269370C - Positioning method of mobile communication system - Google Patents

Abstract

The invention discloses a positioning method of a mobile communication system, comprising: a mobile positioning center receives a positioning request; A request for the address of the mobile switching center where the terminal roams; the home location register returns a message containing the address of the mobile switching center where the mobile terminal roams to the mobile positioning center; the mobile positioning center selects to send a positioning request to the corresponding positioning entity; the positioning entity and The positioning messages are exchanged between the mobile terminals to calculate the position information of the mobile terminals; the positioning entity sends the position information of the mobile terminals to the mobile positioning center. By adopting the technical solution of the present invention, the current location of the mobile terminal is made within the coverage range of the GPS satellite data of the selected positioning entity. The positioning accuracy and success rate are greatly enhanced.

Description

Positioning method of mobile communication system

technical field

The invention relates to a mobile communication system, in particular to the realization of positioning services.

Background technique

The positioning service refers to obtaining the location of a mobile terminal/mobile station (MS) through wireless positioning technology in a mobile communication system, and providing corresponding services based on the location of the mobile terminal. The main application areas of positioning services include: public safety emergency calls, network optimization billing, value-added services, and so on.

Fig. 1 describes the network structure diagram of the positioning system in the mobile communication system based on the mobile terminal plane. Among them, the positioning system includes traditional network entities and newly added entities. The former mainly includes mobile terminals, mobile switching centers and home location registers, and the latter mainly includes mobile positioning centers, positioning entities, and positioning service clients.

The mobile terminal is a mobile terminal communication device with a positioning service function, and its main function is to provide measurement information related to the positioning of the mobile terminal. At the same time, complete the application realization of some positioning services.

The mobile positioning center is the core entity for the realization of positioning services. The main function is to control the positioning process, interact with various entities, and store and provide the location information of the mobile terminal.

The function of the positioning entity is mainly to process the information sent by the mobile terminal to the network side, so as to calculate the location information of the mobile terminal.

The location service client is a service application entity. It obtains the location information of the mobile terminal through the mobile positioning center, and then provides different location services according to the location information of the mobile terminal. This entity is managed by the location service provider.

In the above-mentioned positioning network based on the mobile terminal plane, the mobile terminal, the mobile positioning center, the positioning entity and the positioning service client are connected through the TCP/IP (Transfer Control Protocol/Internet Protocol, that is, Transmission Control Protocol/Internet Protocol) network . Certainly, the mobile terminal, the mobile positioning center, the positioning entity and the positioning service client can also be connected through the existing circuit switching network. The communication between the mobile positioning center, the mobile switching center and the home location register is carried out through the No. 7 signaling network. During physical implementation, two or more entities in the network structure can be combined into one physical entity.

In the CDMA (Code Division Multiple Access, Code Division Multiple Access) mobile communication network, the positioning service system will have multiple mobile positioning centers and multiple positioning entities in the network. When realizing the positioning service, especially when calculating the position information of the mobile terminal, it will face the selection of the positioning entity. The existing methods generally directly select the local positioning entity or randomly select the positioning entity to calculate the position information of the mobile terminal. The local positioning entity is the positioning entity to which the mobile terminal belongs at the place where the account is opened, and generally has a one-to-one correspondence relationship with the mobile positioning center. The existing positioning methods can refer to China Unicom's "800MHz CDMA Digital Cellular Mobile Communication Network Positioning Service Mobile Terminal Plane Related Equipment Technical Requirements" and China Unicom's "800MHz CDMA Digital Cellular Mobile Communication Network Mobile Application Part Technical Requirements"

The disadvantage of the existing method is that the positioning entity generally needs to save the mobile communication base station data in the area where the mobile terminal is actually located in order to accurately locate the mobile terminal, and when the local positioning entity is used, the mobile terminal may have roamed to other places. At this time, the local positioning entity may not have the data of foreign base stations, especially the base station data of the roaming location, resulting in positioning failure. The coverage of the GPS (Global Positioning System, Global Satellite Positioning System) satellite reference receiving equipment of the positioning entity is generally about 600 kilometers. If the above-mentioned traditional method of selecting the positioning entity is followed, the current actual location of the mobile terminal may not be selected. The GPS satellite of the local positioning entity refers to the coverage area of the receiving device, which causes the positioning accuracy to decrease, or even the positioning fails. Moreover, the method of selecting a local positioning entity is more difficult for network deployment, and the network structure is not flexible. It is necessary to set up multiple sets of mobile positioning centers and positioning entities in the network, and the cost is relatively high. From this, it can be seen that the existing selection methods for positioning entities have their imperfections.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the technical problem in the existing mobile communication positioning system that the selection of the positioning entity is not perfect when the positioning is realized, which leads to the reduction of the positioning accuracy.

The technical scheme that realizes the technical problem to be solved by the present invention and takes is summarized as follows:

A positioning method for a mobile communication system is provided, comprising the following steps:

(1) The mobile positioning center receives the positioning request;

(2) The mobile positioning center sends a request message to the home location register of the account opening place of the mobile terminal requesting the positioning service, and the request message includes a request for the address of the mobile switching center where the mobile terminal roams;

(3) The home location register returns a message containing the address of the mobile switching center where the mobile terminal roams to the mobile positioning center;

(4) The mobile positioning center chooses to send a positioning request to the corresponding positioning entity;

(5) Exchanging positioning messages between the positioning entity and the mobile terminal, and calculating the position information of the mobile terminal;

(6) The positioning entity sends the location information of the mobile terminal to the mobile positioning center. Further, the request message is a short message application message.

By adopting the technical solution of the present invention, by selecting the corresponding positioning entity in the positioning process, it can ensure that the positioning entity provides the base station information of the base station at the current location of the mobile terminal, so that the current location of the mobile terminal is within the coverage of the GPS satellite data of the selected positioning entity . The positioning accuracy and success rate are greatly enhanced. At the same time, by sending a request message including a short message application message to the home location register of the place where the mobile terminal opens an account, on the one hand, the address of the mobile switching center where the mobile terminal roams can be obtained, thereby improving positioning accuracy and success rate; You can increase the regional restrictions on user positioning, restrict users to locate in certain areas, and increase service flexibility. Further, if the mobile terminal is in arrears, the positioning process is directly terminated.

Description of drawings

Fig. 1 is a schematic diagram of the network structure of the positioning service based on the mobile terminal plane of the present invention;

Fig. 2 shows a schematic flow chart of the positioning method of the present invention;

FIG. 3 shows a schematic diagram of a positioning process of an embodiment of the positioning method of the present invention;

Fig. 4 shows a schematic diagram of a positioning process of another embodiment of the positioning method of the present invention.

Detailed ways

The specific implementation manner of the present invention will be illustrated below with reference to the accompanying drawings.

In the present invention, the positioning method of the mobile communication system provided, with reference to accompanying drawing 2, mainly comprises the steps that following sequence is carried out:

The mobile positioning center receives the positioning request;

The mobile positioning center sends a request message to the home location register of the account opening place of the mobile terminal requesting the positioning service, and the request message includes a request for the address of the mobile switching center where the mobile terminal roams;

The home location register returns to the mobile positioning center a message containing the address of the mobile switching center where the mobile terminal roams;

The mobile positioning center chooses to send a positioning request to the corresponding positioning entity;

Exchanging positioning messages between the positioning entity and the mobile terminal, and calculating the position information of the mobile terminal;

(1) The positioning entity sends the location information of the mobile terminal to the mobile positioning center.

First, the first specific embodiment of the present invention will be described. According to FIG. 3 , it shows the location flow of the present invention in which the mobile terminal actively initiates the location service request, and the flow is based on WAP (WirelessApplication Protocol, ie wireless application protocol) application. Its specific implementation steps are as follows:

Execute step 2.1, the mobile terminal accesses the positioning service client through WAP, and sends a positioning service request;

Execute step 2.2, the positioning service client sends a positioning request to the mobile positioning center;

Execution of step 2.3, the mobile positioning center sends a request message to the address of the mobile switching center where the mobile terminal roams to the home location register of the mobile terminal account opening place. In this embodiment, the mobile positioning center sends a request message to the home location register of the mobile terminal account opening SMSREQ (ShortMessageService Request, short message request message) message;

Execute step 2.4, described home location register returns SMSREQ message, carries parameters such as short message address (being the address of the mobile switching center of mobile terminal roaming location), short message access denial reason in SMSREQ message. At the same time, in this step, it is also possible to increase the short message address in the SMSREQ return message to determine whether the mobile terminal is in the coverage of the packet data network, or to increase the judgment of the area restrictions on the positioning of the mobile terminal, etc., and to access the negative reason through the short message Parameters to judge whether the mobile terminal is powered off or in arrears, etc., and can decide whether to continue the positioning service based on the above-mentioned different judgment results. For example, if the mobile terminal is in arrears, the positioning process will be directly terminated.

Execute step 2.5, and the positioning service client returns a request response through WAP;

Execute step 2.6, the mobile positioning center sends an authentication message to the mobile terminal/location service client database, and checks whether the mobile terminal and the location service client that initiated the positioning are authorized;

Step 2.7 is executed, and the mobile terminal/location service client database returns the authentication result to the mobile location center. The authentication result should include the following information: whether the positioning service client and the mobile terminal are contracted mobile terminals, the identification and positioning capability of the mobile terminal, whether the requesting positioning service client is allowed to locate, etc. The database of the mobile terminal/location service client is a part of the mobile location center, and the processing is carried out through the internal interface.

Execute step 2.8, the mobile terminal initiates a positioning request to the mobile positioning center;

Execute step 2.9, the mobile positioning center selects the corresponding positioning entity through the configuration relationship between the mobile switching center address and the positioning entity, and then sends a positioning request to the positioning entity using a geographic location request message. The configuration relationship between the address of the mobile switching center and the positioning entity can be a correspondence table about the address of the mobile switching center and the identification of the positioning entity stored in the mobile positioning center. Through the correspondence table, the current location of the mobile terminal is in the The selected positioning entity is within the coverage of GPS satellite data. Generally, the address of the mobile switching center and the identification of the positioning entity have a many-to-one correspondence, that is, one positioning entity may correspond to multiple addresses of the mobile switching center. . In this way, the identification of the corresponding positioning entity can be easily obtained from the address of the mobile switching center. For the situation where the corresponding relationship cannot be found, a default positioning entity is set to ensure the completion of the positioning service;

Execute step 2.10, the mobile positioning center sends a positioning response to the mobile terminal, and activates the mobile terminal to initiate a positioning interaction session;

Execution of step 2.11, positioning message interaction between the positioning entity and the mobile terminal, and calculation of the location information of the mobile terminal;

Execute step 2.12, the positioning is completed, the positioning entity uses the geographic location request response message to send the positioning result to the mobile positioning center, and the mobile positioning center stores the current position information of the target mobile terminal;

Execute step 2.13, the mobile positioning center returns the mobile terminal position information to the positioning service client;

Execute step 2.14, the mobile terminal sends a positioning service request to the positioning service client through WAP;

Step 2.15 is executed, and the location service client returns location service information to the mobile terminal through the WAP to provide services for the mobile terminal. Finish.

In the above specific process, the mobile positioning center determines the corresponding positioning entity through the address of the mobile switching center where the mobile terminal is roaming, and the address of the mobile switching center where the mobile terminal is roaming is obtained through the short message request message SMSREQ acquired. Of course, in order to obtain the address of the mobile switching center where the mobile terminal is roaming, we can also implement it by customizing a new message or using other standard messages that can realize this function in the system. Here, we explain the short message request message SMSREQ. According to China Unicom's "800MHz CDMA Digital Cellular Mobile Communication Network Mobile Application Partial Technical Requirements", the SMSREQ message is used to request the address of the mobile exchange where the mobile terminal is located and the status of the mobile terminal. The specific parameters are as follows:

(1) The specific parameters in the request are as follows: parameter type note MIN m (Mobile terminal ID) ESN 0 electronic serial number SMS—Notification ID 0 SMS notification ID SMS—Service ID 0 SMS Service ID

(1) Parameters in the returned response result: parameter type note ESN 0 electronic serial number SMS—Access Denial Reason 0 SMS Access Negative Reason SMS—address 0 SMS temporary routing address of MS

Parameter description in the table:

1. "M" indicates a mandatory parameter, and "0" indicates an optional parameter;

2. "SMS-address" is the address of the mobile switching center where the mobile terminal roams;

3. "SMS—Access Negative Reason" can indicate the state of the mobile terminal (in arrears, shutdown, etc.).

Further, another specific embodiment of the present invention will be described. According to FIG. 4 , it shows another positioning process in which the mobile terminal actively initiates positioning according to the present invention, and the process is based on the built-in application of the mobile station. Its specific implementation steps are as follows:

Execute step 3.1, the mobile terminal initiates a positioning request to the mobile positioning center;

Execute step 3.2, the mobile positioning center sends the request message of the address of the mobile switching center where the mobile terminal roams to the home location register of the place where the mobile station has an account. In this embodiment, the mobile positioning center sends a request message to the home location register where the mobile station opens an account SMSREQ message;

Execute step 3.3, home location register returns SMSREQ message, carries parameters such as short message address (being the mobile switching center address of mobile terminal roaming location), short message access denial reason in SMSREQ. At the same time, this step can be increased by judging whether the mobile terminal is in the coverage area of the packet data network by the short message address in the SMSREQ return message, or increasing the judgment of the regional restrictions on the positioning of the mobile terminal, etc., and can also judge the reason for the denial of access by the short message Whether the mobile terminal is in arrears, etc.

Execute step 3.4, the mobile positioning center sends an authentication message to the mobile terminal/roaming mobile positioning center address database, and checks whether the mobile terminal that initiates positioning and the corresponding mobile terminal resident program are authorized;

Step 3.5 is executed, and the mobile terminal/roaming mobile positioning center address database returns the authentication result to the mobile positioning center. The authentication result should include the following information: whether the positioning service client and the mobile terminal are contracted mobile terminals, the mobile terminal identification and positioning capability, whether the requesting positioning service client is allowed to locate, etc.;

Step 3.6 is executed, the mobile positioning center selects a positioning entity through the configuration relationship between the mobile switching center address and the positioning entity, and sends a positioning request to the positioning entity using a geographic location request message. The configuration relationship between the address of the mobile switching center and the positioning entity can be a correspondence table about the address of the mobile switching center and the identification of the positioning entity stored in the mobile positioning center. Through the correspondence table, the current location of the mobile terminal is in the The selected positioning entity is within the coverage of GPS satellite data. Generally, the address of the mobile switching center and the identification of the positioning entity have a many-to-one correspondence, that is, one positioning entity may correspond to multiple addresses of the mobile switching center. In this way, the identification of the corresponding positioning entity can be easily obtained from the address of the mobile switching center. For the situation where the corresponding relationship cannot be found, a default positioning entity is set to ensure the completion of positioning;

Step 3.7 is executed, the mobile positioning center sends a positioning response to the mobile terminal, and activates the mobile terminal to initiate a positioning interaction session.

Execute step 3.8, the positioning message interaction between the positioning entity and the mobile terminal is performed to calculate the position of the mobile terminal;

Step 3.9 is executed, and the positioning entity returns the positioning result to the mobile positioning center by using the geographic location request response. Finish.

According to the above two specific implementation methods, it can be seen that the address information of the relevant mobile switching center where the mobile terminal roams is obtained through a short message request, and then the mobile terminal is roughly defined in the location range, and the positioning entity is selected based on this information. Moreover, selecting a positioning entity through user roaming can reduce the difficulty of network deployment, reduce the number of settings for mobile positioning centers and positioning entities, reduce costs, increase the flexibility of network structure, and reduce the lack of base station data or GPS satellite reference signals. Positioning accuracy decreases due to coverage. The technical scheme of the invention can be implemented not only in the positioning system based on the packet network, but also in the positioning network based on the No. communications, that is, the global digital mobile phone system) or WCDMA (Wideband Code Division Multiple Access, that is, broadband CDMA system) and other mobile communication systems.

Although the disclosed positioning method related to a mobile communication system has been specifically described with reference to the embodiments, those skilled in the art will understand that various changes in form and details may be made thereto without departing from the scope and spirit of the present invention. Obvious modifications. Therefore, the embodiments described above are illustrative rather than restrictive, and all changes and modifications are within the scope of the invention without departing from the spirit and scope of the invention.

Claims (8)

1, the location method of mobile communication system, it is characterized in that, comprises the following steps: (1) The mobile positioning center receives the positioning request; (2) The mobile positioning center sends a request message to the home location register of the account opening place of the mobile terminal requesting the positioning service, and the request message includes a request for the address of the mobile switching center where the mobile terminal roams; (3) The home location register returns a message containing the address of the mobile switching center where the mobile terminal roams to the mobile positioning center; (4) The mobile positioning center selects to send a positioning request to the corresponding positioning entity according to the configuration relationship between the mobile switching center address and the positioning entity; (5) Exchanging positioning messages between the positioning entity and the mobile terminal, and calculating the position information of the mobile terminal; (6) The positioning entity sends the location information of the mobile terminal to the mobile positioning center. 2. The positioning method of the mobile communication system according to claim 1, characterized in that the step (1) also includes the following steps: (1.1) The mobile terminal accesses the positioning service client through WAP, and sends a positioning service request; (1.2) The positioning service client sends a positioning request to the mobile positioning center; And, the following steps are also included in the step (3): (4.1) The positioning service client returns the positioning service request response of the mobile terminal to the mobile terminal through WAP; And, the following steps are also included in the step (6): (6.1) The mobile positioning center stores the current location information of the target mobile terminal; (6.2) The mobile positioning center returns the location information of the mobile terminal to the positioning service client; (6.3) The positioning service client returns the positioning service information to the mobile terminal through WAP. 3. The positioning method of the mobile communication system according to claim 1, characterized in that the step (1) also includes the following steps: The mobile terminal initiates a positioning request to the mobile positioning center. 4. The positioning method of a mobile communication system according to any one of claims 1 to 3, wherein the request message is a short message application message. 5. The positioning method of the mobile communication system according to claim 4, characterized in that, the step (3) also includes the following steps: A step of judging whether the mobile terminal is in arrears according to the access denial reason parameter. 6. The positioning method based on the address of the mobile switching center according to claim 5, wherein the configuration relationship makes the current location of the mobile terminal within the coverage of the GPS satellite data of the selected positioning entity. 7. The positioning method based on the mobile switching center address according to claim 6, characterized in that in the configuration relationship, one positioning entity can correspond to multiple mobile switching center addresses. 8. The positioning method of the mobile communication system according to claim 6, further comprising the step of setting a default positioning entity when there is no configuration relationship between the address of the mobile switching center and the positioning entity.

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