KR20010019815A - Method for setting up call in wireless communication - Google Patents

Abstract

PURPOSE: A method for setting up a call in a mobile communication network is provided to supply only address information of the second VLR(Visited Location Register) of an incoming MS(Mobile station) to the first VLR of an originating MS, without detecting location information of the incoming MS from the second VLR. Therefore, a signal load between networks can be reduced and a time necessary for call setup can be reduced. CONSTITUTION: According to a call setup request message supplied from an originating MS(Mobile Station)(MS-A), the first VLR(Visited Location Register)(VLR-A) in which the originating MS(MS-A) is located detects an address of the second VLR(VLR-B) in which an incoming MS(MS-B) is located. The first VLR(VLR-A) delivers the call setup message to the second VLR(VLR-B), according to the detected address. According to the call setup message, the second VLR(VLR-B) supplies the call setup message and a TLDN(Temporary Location Directory Number) for the incoming MS(MS-B) to an MSC(MSC-B) in which the incoming MS(MS-B) is located. The MSC(MSC-B) pages the incoming MS(MS-B) according to the TLDN, and delivers the call setup message. A connection message from the originating MS(MS-A) transmitted correspondingly to the call setup message, and a call between the originating MS(MS-A) and the incoming MS(MS-B) is set up.

Description

How to set up call in mobile network {METHOD FOR SETTING UP CALL IN WIRELESS COMMUNICATION}

The present invention relates to a mobile communication network, and more particularly, to a call setup method of a mobile communication network with a reduced call setup time.

With the development of communication technology, a mobile communication technology capable of communicating even while the terminal is moving has been developed and used. In order to communicate between terminals, a call path must be established between terminals, but in a mobile communication network, a unique call path setting process, that is, a call setting process, which requires setting a call path between terminals through a radio resource is required.

1 is a diagram for establishing a call between terminals in a mobile communication network. In the figure, symbol A denotes a calling terminal, symbol B denotes a called terminal, and MSC_A denotes a mobile switch center in a mobile communication network controlling a call of terminal A; , MSC), and BS_A means a base station where a call path is formed with the terminal A. FIG.

The call setup process in FIG. 1 is performed only after the location registration for the terminal A is performed, and the telephone number information of the terminal B is transmitted by the user of the terminal A. FIG.

The terminal A should transmit a terminal association message for the call connection with the mobile communication network. The terminal association message is a terminal requesting a service to the MSC. The terminal unique Mobile Ientification Number (MIN) information, user data, and signal data that allow the MSC to confirm whether the terminal is eligible for service. Encryption and the like. In response to the terminal association message, the MSC_A examines whether the terminal is eligible for the service, and if it is determined that the terminal is eligible, the MSC_A proceeds to the outgoing call processing process and transmits a terminal alliance permission message for the service request to the terminal A.

When the terminal cooperation permission message is received, the terminal A transmits a Set Up message to the MSC_A through BS_A. The call setup message is a message that the terminal A requests call setup with an arbitrary terminal B, and includes a telephone number of the calling terminal A and the called terminal B, information for channel formation, and the like.

In response to this call setup message, the MSC_A transmits a message during call processing to BS_A, that is, a message indicating that it is successfully receiving data necessary for call setup, to UE A, and then allocates radio resources to UE BS to BS_A. Ask. The BS_A establishes a radio link with the terminal A in response to this request, and notifies the MSC_A that the radio resource allocation is completed. When the radio resource allocation completion signal is inputted, the MSC_A translates the telephone number of the called terminal B, which has been previously input, and requests location information on the called terminal B from the VLR_A. Here, if the called terminal B is not stored in the VLR_A, the VLR_A requests the location information of the called terminal B from the Home Location Rgister (hereinafter referred to as HLR_B) in charge of the called terminal B.

In response to the request for location information of the called terminal B, the HLR_B searches for a visited location register (hereinafter referred to as VLR_B) for the area in which the called terminal B is located, and requests location information from the corresponding VLR_B. Send a message. The VLR_B checks whether the information of the called terminal B corresponding to the location request message is stored, and if the information of the called terminal B is stored, requests the paging of the called terminal B to the corresponding MSC_B. In response to this paging request, MSC_B requests paging to destination terminal B, and if a paging response message is sent from destination terminal B, terminal B exists in its jurisdiction and thus is temporarily provisioned for terminal B. Send a Location Location Number (TLDN) to HLR_B. The TLDN means a number temporarily assigned to the terminals B in order to wirelessly connect the terminal B and the MSC_B. HLR_B provides this TLDN information to VLR_A, and VLR_A provides this TLDN information back to MSC_A so that MSC_A can route a call establishment message for the called terminal B. That is, MSC_A transmits a call setup message to MSC_B, and MSC_B transmits a call setup message to the called terminal B using the TLDN. Upon receiving the call establishment message, the called terminal B transmits a call processing message (Call Processing) to MSC_B indicating that reception of the message for call establishment is successfully performed. The MSC_B requests radio resource allocation for the terminal B to the BS_B in response to the message during the call processing, and BS_B establishes a radio link with the terminal B according to the request and indicates that the radio resource has been allocated. Notify

Thereafter, the terminal B transmits, to the MSC_B, an waiting message indicating that the terminal is waiting for call setup. The MSC_B may provide a ring signal to the terminal A through BS_B in response to this waiting message. MSC_B notifies that terminal B is waiting for call establishment by providing a waiting message of terminal B to MS A through MSC_A, and provides ringback tone to UE A using a predetermined call path. It may be.

When the terminal B receives an incoming call under the control of the user in the standby state, the terminal B provides a connection message indicating that the incoming call has been received, and the connection message is sent to the terminal A through MSC_B and MSC_A. After the call is provided, a call is established between the terminals A and B to transmit and receive data.

As can be seen from the above description, in the conventional call setup method, the position information of the called terminal is queried to the VLR_B through the HLR of the called side, that is, the HLR_B, and the position information of the called terminal detected through the VLR_B is again returned to the HLR_B and It has a configuration provided to MSCR_A via the calling party VLR_A. However, when the called terminal moves only in one VLR region, the HLR_B does not need to receive and process information about the movement. Therefore, in the above-described configuration, when the location of the called terminal is confirmed only once, and only moves within the identified VLR region, it is not necessary to provide the position of the called terminal to HLR_B, but conventionally, in such a case and the called terminal to HLR_B. Since the location of the signal is provided, the signal load between the manganese increases, causing communication delays.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a method for providing location information on a called terminal to a calling MSC without passing through a called HLR.

In order to achieve the above object, the present invention provides a first visitor location register in which a caller terminal is located according to a call setup request message provided from a caller terminal, comprising: detecting an address of a second visited location register in which a called terminal is located; Forwarding the call establishment message to the second visited location register according to the detected address; Providing, by the second visited location register, the call establishment message to the mobile communication exchange in which the called terminal is located together with a temporary location directory number (TLDN) for the called terminal according to the call establishment message; The mobile communication switch includes: paging the called terminal according to the temporary location area number and delivering a call setup message; And providing a connection message from the calling terminal transmitted in response to the call setting message to the called terminal, and setting up a call between the calling terminal and the called terminal.

1 is a diagram illustrating a call setup method in a conventional mobile communication network;

2 is a diagram illustrating a connection between communication networks in a mobile communication network;

3 is a schematic block diagram of an apparatus constituting a communication network;

4 is a diagram illustrating a call setup method according to the present invention;

5 is a view schematically showing a call setup process according to a conventional method;

6 is a schematic diagram illustrating a call setup process according to the present invention.

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

MS: terminal BS: base station

MSC: Mobile Switching System HLR: Home Location Register

VLR: Landing Location Register

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 shows an example of two communication networks 10 and 20, where a communication network means a communication network controlled by one MSC, and these communication networks 10 and 20 communicate with each other through signal lines. This is possible.

3 shows an example of a communication network, where MS means a mobile station, and a subscriber can wirelessly connect to a network using the MS. (B) is a mediation between the MS and the Mobile Switch Center (hereinafter referred to as MSC), and is mainly composed of a BTS (Base Tranceiver System) and a BSC (Base Station Controller). One or more transceivers located in the field to perform wireless communication with the MS A BSC is a device for controlling BTSs that exchanges messages with BTSs and MSCs. Do.

MSC refers to an automated system that interfaces user communications from a wireless network to a wired or wireless network.

The Home Location Register (hereinafter referred to as HLR) refers to a functional device that stores subscriber information (eg, an electronic serial number, a user file, and a current location) to manage mobile subscribers. The HLR can be located integrated with the MSC or can be located independently of the MSC, and can serve multiple MSCs as a single HLR.

Visited Location Register (hereinafter referred to as VLR) refers to a functional device that is connected to one or more MSCs and stores subscriber information obtained from a user's HLR when the subscriber is located in an area covered by the VLR. . When the mobile MS enters a new service area covered by the MSC, the MSC requests and reads information about the MS from the HLR and stores it in the associated VLR.

The call setup process in the future having the above-described configuration will be described in detail with reference to FIG. In FIG. 4, _A is added at the bottom of the name of the components in the communication network 10, and _B is added to the components in the communication network 20. For example, the MSC belonging to the communication network 10 is indicated as MSC_A.

In the following process, only the process after the location registration with respect to the terminal MS_A is performed and the telephone number information of the terminal MS_B is transmitted by the user of the terminal MS_A is shown.

The terminal MS_A transmits a terminal association message in the same manner as the conventional one for making a call connection with the mobile communication network. In response to the terminal association message, the MSC_A examines whether the terminal is eligible for service, and if it is determined that the terminal is eligible, the MSC_A proceeds to the outgoing call processing process and transmits a terminal alliance permission message to the terminal MS_A.

When the terminal association permission message is received, the terminal MS_A transmits a set up message to the MSC_A. In response to this call setup message, MSC_A transmits a message during call processing to BS_A, that is, a message indicating that it is successfully receiving data necessary for call setup, to MS_A, and then allocates radio resource to MS_A to BS_A. Ask. The BS_A establishes a radio link with the terminal MS_A in response to this request, and notifies the MSC_A that the radio resource allocation is completed. When the radio resource allocation completion signal is inputted, the MSC_A translates the telephone number of the called terminal MS_B previously inputted and requests location information on the called terminal MS_B from the VLR_A. Here, if the called terminal MS_B is not stored in the VLR_A, the VLR_A requests the location information of the called terminal MS_B from the Home Location Rgister (hereinafter referred to as HLR_B) that manages the called terminal MS_B.

The HLR_B provides only the address information of the visited location register (hereinafter referred to as VLR_B) to the VLR_A in response to the request for the location information of the called terminal MS_B. VLR_A provides the address of VLR_B back to MSC_A, and MSC_A determines that the called terminal belongs to another station according to this address information, and provides a call setup message to VLR_A.

VLR_A provides a call setup message to VLR_B in response to the call setup message of MSC_A. Since the address information of the VLR_B is provided to the VLR_A as described above, the call setup message may be provided to the VLR_B. Since the terminal MS_B exists in the jurisdiction of the VLR_B, the VLR_B transmits a call setup message to the MSC_B along with a temporary location directory number (TLDN) for the terminal MS_B. The TLDN means a number temporarily assigned to the terminals MS_B in order to wirelessly connect the terminal MS_B and the MSC_B.

The MSC_B performs paging for the called terminal MS_B according to the received TLDN information, and if the paging result terminal MS_B responds, the MSC_B transmits a call setup message to the called terminal MS_B. The receiving terminal MS_B receiving the call establishment message transmits a call processing message (Call Processing) to MSC_B indicating that reception of the message for call establishment is successfully performed. The MSC_B requests radio resource allocation for the terminal MS_B to the BS_B in response to this call processing message, and BS_B establishes a radio link with the terminal MS_B according to the request and then indicates that the radio resource has been allocated. Notify

Thereafter, the terminal MS_B transmits, to the MSC_B, an waiting message indicating that the terminal is waiting for call setup. The MSC_B may provide a ring signal to the terminal MS_B through BS_B in response to this waiting message. The MSC_B notifies that the MS_B is in call setup waiting state by providing a waiting message of the terminal MS_B to the terminal MS_A through the MSC_A, and provides a ringback tone to the terminal MS_A using a predetermined call path. It may be.

When the terminal MS_B receives an incoming call under the control of the user in the standby state, the terminal MS_B provides a connection message indicating that the incoming call has been received, and the connection message is transmitted to the terminal MS_A through MSC_B and MSC_A. After the call is provided, a call is established between the terminals MS_A and MS_B so that data can be transmitted and received.

The conventional call setup method described above and the call setup method of the present invention are briefly compared with reference to FIGS. 5 and 6 as follows. In FIG. 5 and FIG. 6, it is assumed that the VLR is configured in the MSC. Accordingly, there is no signal transmission between the VLR and the MSC.

In the conventional method illustrated in FIG. 5, the position information of the terminal MS_B is requested to the HLR_B through the VLR_A, and the HLR_B requests the position information of the terminal MS_B from the VLR_B according to the request. The location information of the terminal MS_B detected by the VLR_B is provided to the VLR_A via the HLR_B, and the MSC_A provides a call setup message to the MSC_B according to the location information provided to the VLR_A. The MSC_B responds to this call setup message by paging the terminal MS_B, and according to the paging response of the terminal MS_B, it is necessary to perform a process of providing a message during call processing to the MSC_B. Can be.

On the other hand, in the present invention, the VLR_A requests the HLR_B for location information on the terminal MS_B, and the HLR_B provides the VLR_A with address information for the VLR_B in the region where the MS MSB is located. The MSC_A transmits a call setup message to the VLR_B using the address information of the provided VLR_B, and accordingly, the MSC_B uses the TLDN information of the called terminal MS_B stored in the VLR_B to page the called terminal MS_B. As a result of the paging, when the terminal responds to the paging, the MSC_B performs a process of providing the message during the call process to the MSC_B, it can be seen that a total of four steps are required.

As can be seen from the above description, in the present invention, the location information of the destination terminal is provided to the destination HLR_B by providing only the address information of the VLR_B to the source VLR_A without detecting the location information of the destination terminal from the destination terminal VLR_B. The step can be deleted, reducing the manganese signal load and reducing the time required for call setup.

Claims (2)

As a call setup method of a mobile communication network, Detecting the address of the second visited location register in which the called terminal is located according to a call setup request message provided from the calling terminal; Transmitting, by the first visited location register, a call establishment message to the second visited location register according to the detected address; Providing, by the second visited location register, a call setup message to a mobile communication switch in which the called terminal is located along with a temporary location directory number (TLDN) for the called terminal according to the call setup message; The mobile communication exchange page the destination terminal according to the temporary location area number and forward the call setup message; And providing a connection message from the calling terminal transmitted in response to the call setting message to the called terminal, and setting up a call between the calling terminal and the called terminal. The method of claim 1, And the address of the second visited location register is detected from a home location register to which the called terminal belongs.