KR20050028436A - Position determination service system of the mobile telecommunication network and method for operating same - Google Patents

Abstract

A location determination service system in a mobile communication network and a method for operating the same are provided to improving service quality by transmitting a message associated with location determination in a TCP/IP method or a DBM method according to the present call state of an MS(Mobile Station) and reducing time delay in measuring the location of the mobile station with a high location positioning success rate. If a calling MS transmits a short message containing location determination service request information to an LBS(Location Based Service) server through an SMC(Short Message service Center)(S10), the LBS server transmits a request signal to the SMC in order to measure the location of a called MS(S20). The SMC creates a short message containing a TI(Teleservice ID) value to obtain the present call state information of the called MS and sends it to the called MS. The called MS, receiving the short message containing the TI value, generates a response message containing a SO(Service Option) value according to its present state. The response message containing the SO value is delivered to the LBS server(S30-S40). The LBS server confirms the present state of the called MS, based on the SO value contained in the response message(S50). The LBS server sets the location determination message transmission mode as an IS-801-1 TCP/IP method or an IS-801-1 DBM method according to the SO value and notifies a PDE(Position Determination Entity) server of it.

Description

POSITION DETERMINATION SERVICE SYSTEM OF THE MOBILE TELECOMMUNICATION NETWORK AND METHOD FOR OPERATING SAME}

The present invention relates to a positioning service technology of a mobile communication network, and more particularly, to a positioning service system of a mobile communication network and a method of operating the same, which can improve service quality by reducing a positioning success rate and a time delay for measuring a position of a terminal. It is about.

Positioning service of the mobile communication network enables automatic identification and tracking of the location of a person having a mobile communication terminal or a vehicle equipped with the mobile communication terminal in real time without a separate device. In addition, the location information can be sent by SMS (Short Message Service) text message, so you can check the current location and route of people or vehicles on the electronic map, and can be used in emergency situations such as traffic accidents. It is a service that can be applied.

Positioning service in the mobile communication network is a method of determining the position of the mobile terminal using a GPS (Global Positioning System) and the mobile communication network largely the method of embedding the GPS chipset in the terminal and the position of the terminal using the pilot signal from the communication network It is divided into how to get.

The location service protocol is defined in the Position Determination Service Standard for Dual Mode spread spectrum Systems-Addendum (IS-801-1). The most widely used method of positioning service proposed by IS-801-1 is a method of starting from a mobile terminal and calculating a position from a position determination entity (PDE) server. At this time, if there is enough GPS antenna (received from three or more satellites), the mobile terminal calculates the location using the base station information and the GPS information, but if the GPS reception is insufficient, the mobile terminal determines the location to the PDE server using a mobile communication network such as CDMA. Calculate.

While location-related messages recommend IS-801-1 to use Data Burst Message (DBM), Qualcomm transmits wireless data through Transmission Control Protocol / Internet Protocol (TCP / IP). A method of using a protocol is implemented in MSM (Mobile Station Modem).

Accordingly, A-GPS (Assisted-GPS) -based terminal location service method is largely transmitting a location location message in a TCP / IP method or a data burst message (DBM) method.

When sending a message of positioning service by TCP / IP method, it connects a TCP / IP data channel to a positioning entity (PDE) server and sends and receives wireless data necessary for positioning at once, which reduces the positioning time and reliably a lot of data. Can transmit and receive. However, since the mobile terminal can be used only in an idle state or in a state where a data call is connected and cannot be used when busy, the positioning success rate is lowered.

When transmitting a location positioning service message in a data burst message (DBM) manner, the location may be independently determined depending on the state of the terminal. However, by sending / receiving positioning data several times using a short message (SMS message), there is a problem that the quality of service is lowered due to a significant time delay compared to the TCP / IP method.

An object of the present invention is to check the current call status of the mobile terminal of the location target using a short message service (SMS) to solve the problems of the prior art as described above, and TCP / IP or data burst according to the call status of the terminal The present invention provides a location service system and a method of operating the mobile communication network which can improve the quality of service by reducing the location success rate and the time delay for measuring the location of the terminal by determining the location service using a message (DBM) method. .

In order to achieve the above object, the present invention provides a system for servicing a location of a terminal in a mobile communication network, and transmits a signal for requesting location for any called terminal from a calling terminal of the mobile communication network and calculates the calculated location information. It sends a short message to the called terminal through the mobile exchange to the calling terminal, the PDSN sending the calculated location information to the calling terminal of the mobile communication network, and the mobile switching terminal during the positioning service. A short message center that receives and transmits the message, a location entity server that transmits a message to the PDSN by TCP / IP method according to the current call state of the called terminal, and measures the position location of the called terminal, and When receiving a location request signal, the short message center It sends a short message to the called terminal, manages to transmit a message to the positioning entity server with the PDSN by TCP / IP according to the current call state of the terminal in the message received from the called terminal, and measures the location of the measured terminal. It includes a location-based service server for transmitting information to the calling terminal through the PDSN in a TCP / IP manner.

In order to achieve the above object, another system of the present invention provides a service for positioning a terminal in a mobile communication network, and transmits a signal for requesting positioning of an arbitrary destination terminal from a calling terminal of the mobile communication network and calculates a position. A mobile exchange that transmits location information to the calling terminal, a short message center that sends a short message to the called terminal through the mobile exchange during the positioning service, receives a short message received from the called terminal, and transmits the short message; A location entity entity that measures the location of the destination terminal by sending a message to the mobile exchange by data burst message method according to the call status, and receives the location location request signal of the originating terminal from the mobile exchange and receives the message through the short message center. Short Mesh to Terminal It requests to transmit, and manages to transmit the message with the mobile switch in the data burst message method to the positioning entity server according to the current call state of the terminal in the message received from the destination terminal, and measures the location information of the measured destination terminal in the data burst message method. It includes a location-based service server for transmitting to the calling terminal through the mobile switch.

In order to achieve the above object, the method of the present invention provides a method for servicing a location of a terminal in a mobile communication network, the method comprising: transmitting a signal for requesting location for any destination terminal from an originating terminal to a mobile switch in the mobile communication network; And transmitting, by the mobile exchange, the request signal to the location-based service server, and generating the short message through the short message center, and then transmitting the short message to the destination terminal via the mobile exchange. The receiving terminal receives the current call state information of the terminal to the location based service server, and the PDSN of the mobile communication network in a TCP / IP manner to the location entity server according to the current call state of the called terminal. Requesting to send the message.

In order to achieve the above object, another method of the present invention provides a method for servicing a location of a terminal in a mobile communication network, the method comprising transmitting a signal for requesting location for any destination terminal from an originating terminal to a mobile switch of the mobile communication network. Transmitting the request signal to the location-based service server, and the location-based service server generates the short message through the short message center, and then sends the short message to the destination terminal via the mobile exchange. The received terminating terminal transmits current call state information of the terminal to the location-based service server through the mobile switch, and moves from the location-based service server to the location entity server in a data burst message manner according to the current call state of the terminating terminal. To send messages to the exchange. And a step of.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram showing a positioning service system of a mobile communication network according to an embodiment of the present invention. Referring to FIG. 1, the positioning service system of the present invention includes a mobile station (MS) 10 and 32, a base station (BTS) 12 and 30, and a base station controller (BSC). (14, 28), Mobile Switching Center (MSC), Packet Data Serving Node (PDSN) (16), Wireless Application Protocol (WAP) Gateway (18), Location Based Service sever (LBS) Server 20, Mobile Positioning Center (MPC) 22, Position Determination Entity (PDE) server 24, Service Message Service Center (SMC) 26, GPS 40 and the like.

The mobile terminal (MS) 10, 32 is in the range of the base station (BTS) 12, 30, and the terminal information is the base station (BTS) 12, 30 and the base station controller (BSC) 14, 28 controlling it. Information transmitted from the mobile switching center (MSC) 15 or the PDSN 16, and from the mobile switching center (MSC) 15 or the PDSN 16 is transmitted to the base station controller (BSC) 14, 28 and the base station. (BTS) 12, 30 receives from the mobile terminal (MS) (10, 32).

The short message transmitted and received by the mobile station (MS) 10 and 32 (hereinafter referred to as 'SMS message') is a base station (BTS) 12 and 30 and a base station controller (for high frequency signal processing and call processing). BSC) 14, 28 to mobile exchanger (MSC) 15. For this purpose, a data burst message of a paging channel (hereinafter referred to as 'DBM' in the detailed description) when sending an SMS message from a mobile terminal (MS) 10, 32 to a mobile switching center (MSC) 15 in a mobile communication network. When the subscriber is busy, the SMS message is transmitted in a DBM manner of a forward traffic channel. In addition, the DBM of the access channel is used when sending an SMS message from the MS 15 to the MS 10, 32. If the subscriber is busy, the reverse traffic channel is reversed. SMS message is transmitted through the DBM method of the traffic channel).

When implementing the A-GPS based mobile communication network in the system of the present invention, the mobile terminal (MS) 10, 32 has software for processing the IS-801-1 along with the antenna and GPS reception and processing functions of the GPS 40. The chip must be included and the GPS antenna will be used in common with the antenna of the terminal. The mobile terminal (MS) 10, 32 should also have a built-in WAP browser for location services.

The base station (BTS) 12, 30 connects the mobile terminal (MS) 10, 32 to the base station controller (BSC) 14, 28, and performs wireless communication with the mobile terminal (MS) 10, 32. Performs a wired / wireless conversion function in wired communication with the base station controller (BSC) 14, 28.

The base station controller (BSC) 14, 28 connects the base station (BTS) 12, 30 to the mobile switching center (MSC) 15 to coordinate the connection between the base station (BTS) 12, 30, and the multiple base stations (BTS) 12, 30, and serves as a signal processing function for mobile communication between the base station (BTS) (12, 30) and the mobile switching center (MSC) (15). The base station controller (BSC) 14, 28 also connects the base station (BTS) 12, 30 to the WAP gateway 18 via the PDSN 16 to control for wireless data communication.

The mobile switching center (MSC) 15 connects a call when the mobile terminal (MS) 10, 32 of the subscriber makes or receives a call, and connects to the base station controller (BSC) 14, 28, respectively. MS) (10, 32) performs call setup and release functions, and performs various functions related to call processing and additional services, and interworking with other networks.

The PDSN 16 is configured to IP-connect radio signals through interworking between a radio access network (RAN) and a data core network (DCN) including a base station (BTS) 12 and 30 and a base station controller (BSC) 14 and 28. It provides wireless packet data service to mobile subscriber using PPP and TCP / IP protocol by connecting to network.

The WAP gateway 18 interprets the request in the WAP protocol of the PDSN 16, converts the request into a TCP / IP based request, and transmits the request to the LBS server 20 and sends the LBS server 20 to the LBS server 20. TCP / IP-based information is transmitted from the WP protocol to the WAP protocol and then transmitted to the PDSN 16 again.

The location based service (LBS) server 20 acquires the location information of the terminal measured through the base station (BTS) 12, 30 or the GPS 40 by the call signal of the mobile terminal (MS) 10, 32. It is a server that provides subscribers with location-based information services such as logistics, emergency rescue, and traffic information.

Furthermore, the location based service (LBS) server 20 of the present invention receives the location location request signal of the calling terminal from the mobile exchange 15 and requests the SMS terminal to send an SMS message through the short message center (SMC) 26. According to the current call state of the terminal in the message received from the called terminal, the location determination entity (PDE) server 24 transmits a message to the terminal via the PDSN 16 in the IS-801-1 TCP / IP manner or IS- It sets and manages to transmit a message to the mobile switching center (MSC) 15 in a 801-1 DBM manner. Accordingly, the location determination entity (PDE) server 24 collects the location information of the called terminal through the PDSN 16 / mobile switch (MSC) 15 in the TCP / IP method / DBM method and locates the terminal. . The location positioning information of the called terminal measured by the location determination entity (PDE) server 24 is determined by the PDSN 16 or IS by the IS-801-1 TCP / IP method set up through the location based service (LBS) server 20. -801-1 is transmitted to the calling terminal through the mobile switching center (MSC) 15 in a DBM manner. Here, the location-based service (LBS) server 20 is connected to the terminal through the PDSN 16 in the IS-801-1 TCP / IP method when the current call status of the called terminal is idle or data call connection. Set up message transfer. Alternatively, when the current call state of the called terminal is in a busy state, message transmission with the MSC 15 is set by the IS-801-1 DBM method.

The mobile location center (MPC) 22 interoperates with the location-based service (LBS) server 20 and requests mobile terminal (MS) 10 and 32 location information of the terminal, collects location information of the terminal, After calculating the position location of the terminal maps and displays the map.

The location determination entity (PDE) server 24 has the same function as the mobile location center (MPC) 22, which is the location information of the terminal transmitted from the mobile terminal (MS) 10, 32 connected to the PDSN 16. It calculates and provides the location information of the location of the terminal to the location-based server (LBS) server 20 through the mobile location center (MPC) (22). At this time, the location determination entity (PDE) server 24 of the present invention sends a message in a TCP / IP method or a DBM method depending on whether the current call state of the called terminal is in an idle / data call connection state or in a busy state. Send it.

The Short Message Center (SMC) 26 sets the SMS routing function and SMS parameters, interprets the destination address of the incoming SMS message, and converts the mobile switching center (MSC) 15, the base station controller (BSC) 14, 28, and SMS messages are sent to mobile stations (MSs) 10 and 32 via base station (BTS) 12 and 30. Or receiving SMS messages from the mobile stations (MSs) 10 and 32 through the base station (BTS) 12 and 30, the base station controller (BSC) 14 and 28 and the mobile switching center (MSC) 15. Do it. Furthermore, the short message center (SMC) 26 of the present invention transmits an SMS message to the called terminal according to the request of the location-based service (LBS) server 20 during the positioning service, and receives a reply SMS message from the called terminal. It serves to deliver to the location-based service (LBS) server 20.

Finally, the GPS 40 is a satellite device for determining the current position of the mobile terminal (MS) 10, 32.

  2 is a flowchart illustrating a method of operating a location service system of a mobile communication network according to an embodiment of the present invention. 1 and 2, the location service system according to the present invention operates as follows. In the embodiment of the present invention, the mobile terminal 10 of FIG. 1 is defined as the calling terminal 38 as the called terminal and the method of operating the system will be described.

First, the subscriber transmits a call signal having the location request information to the location service provider in order to know the location location of the destination terminal (MS) 38 using its originating terminal (MS) 10. The call request signal of the originating terminal (MS) 10 is configured in the form of an SMS message and transmitted to the mobile switching center (MSC) 15 via the base station (BTS) 12 and the base station controller (BSC) 14. The mobile switching center (MSC) 15 transmits the SMS message requested by the calling terminal (MS) 10 to the location based service (LBS) server 20 through the short message center (SMC) 26.

The location based service (LBS) server 20 receives the SMS message of the location service request from the originating terminal (MS) 10 through the short message center (SMC) 26 (S10). In step S20, the short message center (SMC) 26 responds to the service request signal, and transmits a request signal to the service request signal. Generates an SMS message for knowing call state information of a terminal. This SMS message is sent to the mobile switching center (MSC) 15 where the terminating terminal (MS) 32 is located, including the Teleservice ID (TI) value, and the base station controller (BSC) 28 and the base station (BST) ( 30 is sent to the terminating terminal (MS) 32.

When the receiving terminal (MS) 32 receives an SMS message containing a TI value for knowing the current call status information, the call status of its own terminal is idle / data call connection or busy. Depending on the status, a response SMS message with a corresponding Service Option (SO) value inserted is sent back to the mobile switching center (MSC) 15 via the base station (BTS) 30 and the base station controller (BSC) 28. In this case, when the SO value is 1 or 2, it indicates an idle / data call connection state. When the SO value is 3 or 4, it indicates a busy state. The mobile switching center (MSC) 15 transmits the response SMS message with the SO value inserted to the LBS server 20 through the short message center (SMC) 26 (S30 to S40).

The location based service (LBS) server 20 is idle or data call connected or busy depending on the SO value, which is the current call state information of the terminating terminal (MS) 32 inserted in the response SMS message. It is determined whether or not the state (S50).

As a result of the determination in S50, when the SO value, which is the current call state information of the called terminal (MS) 32, is 1 or 2, since the idle / data call connection state, the location-based service (LBS) server 20 sends a location positioning message. The transmission mode is set to the IS-801-1 TCP / IP method, and the positioning entity (PDE) server 24 is notified of the set IS-801-1 TCP / IP mode.

The positioning entity (PDE) server 24 is thus associated with positioning from the PDSN 16 connected to the TCP / IP data channel via the TCP / IP gateway 18 by means of the established IS-801-1 TCP / IP scheme. Request a message and receive a location response message from PDSN 16. The location information of the terminal is collected from the base station information, GPS information, etc. of the terminating terminal (MS) 32 transmitted from the PDSN 16, and calculated to calculate the location of the terminal (S60).

Although not shown in the figure, the location information of the located called terminal (MS) 32 is mapped and displayed on the map through the mobile location center (MPC) 22, and the location based service (LBS) server 20 The location information of the terminating terminal (MS) 32 is converted into an SMS message through a short text center (SMC) 26 and sent to a mobile switching center (MSC) 15, and the base station controller (BSC) 14 and the base station ( To the originating terminal (MS) 10 via the BTS) 12.

On the other hand, as a result of the determination of S50, if the SO value, which is the current call state information of the terminating terminal (MS) 32, is in a busy state, the location-based service (LBS) server 20 is the location positioning message transmission mode Is set to the IS-801-1 DBM method, and the positioning entity (PDE) server 24 is notified of the set IS-801-1 DBM mode.

In this regard, the positioning entity (PDE) server 24 requests the mobile switching center (MSC) 15 a message related to positioning through the short message center (SMC) 26 by the established IS-801-1 DBM scheme. A location response message is received from the mobile switching center (MSC) 15. The location information of the terminal is collected from the base station information and the GPS information of the terminating terminal (MS) 32 transmitted from the mobile switching center (MSC) 15 and calculated to calculate the location of the terminal.

Although not shown in the figure, the location information of the located called terminal (MS) 32 is mapped and displayed on the map through the mobile location center (MPC) 22, and the location based service (LBS) server 20 Converts the location information of the terminating terminal (MS) 32 into an SMS message through a short text center (SMC) 26 and sends it to the mobile switching center (MSC) 15 to transmit a base station controller (BSC) 14 and a base station. (BTS) 12 to the originating terminal (MS) (10).

Therefore, the position location service system of the present invention provides the PDSN server 24 and the PDSN in a TCP / IP manner when the current call state of the terminating terminal (MS) 32 is in an idle / data call connection state. By transmitting the positioning-related messages between the 16, wireless data necessary for positioning can be transmitted and received at once, so that the positioning time can be shortened and a large amount of data can be transmitted and received stably. In addition, when the current call state of the terminating terminal (MS) 32 is busy, the location-related message between the positioning entity (PDE) server 24 and the mobile switching center (MSC) 15 in a DBM manner. By sending an SMS as an SMS message, the position can be independently determined regardless of the state of the terminal of the positioning target.

As described above, the present invention determines a current call state of a mobile terminal to be located, and determines a location entity entity (PDE) server in a TCP / IP manner when the call state of the terminal is idle / data call connection. Location-related message between the PDSN or PDSN, or when the terminal call status of the location-targeting object is busy, transmits the location-related message by DBM method to the system where the TCP / IP method or DBM method is set up alone. Compared with this, it is possible to improve the quality of service by reducing the positioning success rate and the time delay for positioning the terminal.

On the other hand, the present invention is not limited to the above-described embodiment, various modifications are possible by those skilled in the art within the spirit and scope of the present invention described in the claims to be described later.

1 is a block diagram showing a positioning service system of a mobile communication network according to an embodiment of the present invention;

2 is a flowchart illustrating a method of operating a location service system of a mobile communication network according to an embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

10, 32: mobile terminal (MS) 12, 30: base station (BTS)

14, 28: base station controller (BSC) 16: PDSN

18: gateway of WAP 20: location based service (LBS) server

22: mobile location center (MPC) 24: location entity entity (PED) server

26: short message center (SMC) 40: GPS

Claims (12)

In a system for servicing the location of a terminal in a mobile communication network, A mobile switching unit configured to transmit a signal for requesting location positioning of any called terminal from the calling terminal of the mobile communication network and to transmit the calculated positional positioning information to the calling terminal; PDSN for transmitting the calculated location information to the calling terminal of the mobile communication network; A short message center for transmitting a short message to the called terminal through the mobile switching center and receiving a short message replied from the called terminal during the positioning service; A positioning entity server for transmitting a message to the PDSN by TCP / IP in accordance with the current call state of the called terminal to measure positional positioning of the called terminal; The mobile terminal receives the location request signal of the calling terminal from the mobile switching center, requests the short message to be sent to the called terminal through the short message center, and determines the location according to the current call state of the terminal in the message received from the called terminal. Location-based service server to manage to transmit a message to the PDSN with the PDSN to the entity server, and to transmit the measured location information of the called terminal to the calling terminal through the PDSN in TCP / IP method Positioning service system of the mobile communication network comprising a. The method of claim 1, Wherein the location-based service server transmits a message to the location entity entity server with the PDSN in a TCP / IP manner when the current call state of the called terminal is in a standby state. The method of claim 1, Wherein the location-based service server transmits a message to the location entity entity server with the PDSN in a TCP / IP manner when the current call state of the called terminal is a data call connection state. How it works. In a system for servicing the location of a terminal in a mobile communication network, A mobile switching unit configured to transmit a signal for requesting location positioning of any called terminal from the calling terminal of the mobile communication network and to transmit the calculated positional positioning information to the calling terminal; A short message center for transmitting a short message to the called terminal through the mobile switching center and receiving a short message replied from the called terminal during the positioning service; A positioning entity server which transmits a message to the mobile exchange in a data burst message manner according to a current call state of the called terminal to measure positional positioning of the called terminal; The mobile terminal receives the location request signal of the calling terminal from the mobile switching center, requests the short message to be sent to the called terminal through the short message center, and determines the location according to the current call state of the terminal in the message received from the called terminal. Location-based service server which manages to transmit a message with the mobile exchange to the entity server in a data burst message manner and delivers the measured location information of the called terminal to the originating terminal through the mobile exchange in a data burst message manner. Positioning service system of the mobile communication network comprising a. The method of claim 1, The location-based service server is a method of operating a location positioning service system of a mobile communication network characterized in that when the current call state of the called terminal is in communication with the mobile switch in a data burst message method to the location entity server. . In the method for servicing the location of the terminal in a mobile communication network, Transmitting a signal for requesting positioning of an arbitrary called terminal from an originating terminal to a mobile exchange of the mobile communication network; Transmitting, by the mobile exchange, the request signal to a location-based service server, wherein the location-based service server generates a short message through the short message center and transmits the short message to the destination terminal via the mobile switch; , Receiving the short message by transmitting the current call state information of the terminal to the location-based service server; Requesting from the location-based service server to transmit a message to the location entity entity server with the PDSN of the mobile communication network in a TCP / IP manner according to a current call state of the called terminal; Method of operating a location service system of a mobile communication network comprising a. The method of claim 6, After the step of requesting the location entity server to send a message with the PDSN of the mobile communication network in a TCP / IP manner, Measuring the location information of the called terminal by transmitting a message to the PDSN by TCP / IP in the location entity server; The location based service server transferring the location information of the called terminal measured by the positioning entity server to the calling terminal through the PDSN in a TCP / IP manner; Operation method of a location positioning service system of a mobile communication network further comprising. The method according to claim 6 or 7, And requesting the location entity server to transmit a message to the PDSN in a TCP / IP manner when the current call state of the called terminal is in a standby state. The method according to claim 6 or 7, Requesting the location determination entity server to transmit a message to the PDSN in a TCP / IP manner when the current call state of the called terminal is a data call connection state. In the method for servicing the location of the terminal in a mobile communication network, Transmitting a signal for requesting positioning of an arbitrary called terminal from an originating terminal to a mobile exchange of the mobile communication network; Transmitting, by the mobile exchange, the request signal to a location-based service server, wherein the location-based service server generates a short message through the short message center, and then transmits the short message to the destination terminal via a mobile exchange; Receiving the short message, transmitting the current call state information of the terminal to the location-based service server through the mobile switch; Requesting, from the location-based service server, to transmit a message to the location exchange entity server with the mobile exchange in a data burst message manner according to a current call state of the called terminal; Method of operating a location service system of a mobile communication network comprising a. The method of claim 10, After requesting the location entity server to send a message with the mobile exchange in a data burst message manner, Measuring the location information of the called terminal by transmitting a message to the mobile communication network in a data burst message manner in the location entity server; The location based service server transmitting the location location information of the called terminal measured by the positioning entity server to the calling terminal through the mobile switch in a data burst message manner; Operation method of a location positioning service system of a mobile communication network further comprising. The method according to claim 10 or 11, wherein And requesting the location determination entity server to transmit a message to the mobile switch in a data burst message manner when the current call state of the called terminal is in a busy state.