KR20000051545A - Method for setting up a mobile to mobile call without a mobile switching center - Google Patents

Abstract

PURPOSE: A method of setting up mobile-to-mobile call in cellular radio telecommunication system is provided to set up mobile-to-mobile call by using simulation block in base station controller instead of mobile switching center. CONSTITUTION: A method of setting up mobile-to-mobile call comprises the steps of; when a mobile station requests base station controller to transmit through transmitting base station, a call process block in base station controller requests simulation block to transmit; the simulation block connects mobile station to reception mobile station call, by using the location registering information of reception mobile station and condition information stored in base station controller. For this, simulation block process a message defined as A-interface standard between base station controller and mobile switching center.

Description

{METHOD FOR SETTING UP A MOBILE TO MOBILE CALL WITHOUT A MOBILE SWITCHING CENTER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cellular radio telecommunication system, and in particular, for a call processing operation test of a base transceiver station (BTS) / base station controller (BSC), a mobile switching center (Mobile Switching Center) The present invention relates to a method for establishing a call between mobile terminals without a mobile switching center for establishing a call to mobile terminals using a simulation block implemented in a base station controller instead of an MSC.

The cellular mobile communication system divides the entire service area into a plurality of base station areas to form cells, which are small service areas, and centrally controls these base stations with a mobile switching center (MSC), thereby allowing subscribers to inter-cell. It allows you to continue the call while moving.

1 shows a schematic diagram of a typical cellular mobile communication network, which can be applied to all kinds of wireless systems using Code Division Multiple Access (CDMA) technology, as shown. A mobile station (MS) 10 providing a mobile communication service, a base transceiver station (BTS) 20 and a base station 20 for connecting the mobile terminal 10 through a wireless link A base station controller (BSC) 30 and a mobile switched center (MSC) 40 that controls the base station controller 30.

In the cellular mobile communication network configured as described above, in order for one mobile terminal to set up a call with another mobile terminal, the steps of the originating mobile terminal-originating base station-base station controller-mobile switching station-base station controller-called base station-originating mobile terminal Must go through. The matching between the base station controller and the mobile switching center is called an A-interface, and the base station controller 30 sends and receives messages with the mobile switching center via the A-interface protocol block 32 which manages the A-interface.

2 is a message flow diagram illustrating a call setup method between mobile terminals according to the prior art. As shown, a message transmitted from a base station controller 30 to a mobile switching center 40 or a base station controller 30 from a mobile switching center 40 is shown. Message is transmitted via the A-interface protocol block 32 of the base station controller 30. A-interface protocol block 32 translates the message between base station controller 30 and mobile switching center 40.

In the cellular mobile communication system operated as described above, the producer of the base station and the base station controller normally connects the base station and the base station controller to the mobile switching center and normalizes the system in order to verify that the produced base station / base station controller processes the call normally. Perform.

However, in the case of call processing verification performed by the above procedure (originating mobile terminal-originating base station-base station controller-mobile switching center-base station controller-receiving base station-called mobile terminal), the state and condition of the mobile switching center are greatly affected. In the case of setting up a Mobile to Mobile Call that does not require a mobile switching center, a loss in verification time occurs because the mobile switching center needs to be controlled.

That is, in the method for setting up a call between mobile terminals according to the prior art operating as described above, even when setting up a call between mobile terminals that the mobile switching center does not need, the base station controller must be linked with the mobile switching center, so that there is a delay in time. If the base station controller and the mobile switching center cannot interwork, there is a problem in that a call cannot be established between mobile terminals.

Accordingly, an object of the present invention, which is invented to solve the problems of the prior art operating as described above, is to call a base station controller within a base station controller so that the base station controller can handle calls between mobile terminals without interworking with the mobile switching center. The present invention provides a method for establishing a call between mobile terminals without a mobile switching center that implements a simulation block capable of performing call processing between a processing block and a mobile switching center.

1 is a block diagram of a typical cellular mobile communication network.

2 is a message flow diagram illustrating a call setup method between mobile terminals according to the prior art.

3 is a block diagram of a simulation block according to the present invention;

4 is a message flow diagram illustrating a method for establishing a call between mobile terminals according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10,15 mobile terminal 20,25 base station

30 base station controller 32 A-interface protocol block

35 simulation block 40 mobile switching center

An embodiment of a method for establishing a call between mobile terminals without a mobile switching center according to the present invention, which is designed to achieve the above object,

Requesting, by the mobile terminal, the call from the base station controller through the call base station;

Requesting a connection management service from a call processing block of the base station controller;

The simulation block responding to the call processing block in response to a connection management service;

Requesting setup by the call processing block receiving the connection management service response;

A simulation block, for the setting request, requesting allocation of radio resources;

A call processing block receiving the request for allocation of radio resources, allocating radio resources to the originating mobile terminal through the originating base station, and reporting completion of radio resource allocation;

Requesting an incoming call from a base station controller for completion of allocation of the radio resource by a simulation block;

The call processing block, which is requested to receive the incoming call, calls the called mobile terminal through the called base station, and responds to the incoming call if the called mobile terminal answers;

Allocating radio resources to a terminating mobile terminal through a terminating base station by a call processing block in response to an incoming call;

Reporting, by the call processing block that has completed the allocation of radio resources, to the simulation block that the terminating mobile terminal is waiting;

A simulation block, in response to the call waiting report, notifying a calling mobile terminal through an originating base station that an incoming call is waiting;

If the waiting terminating mobile terminal responds, the call processing block notifying the simulation block of the incoming response;

A simulation block informing, by the originating base station, of a call connection to the originating mobile terminal in response to the incoming response; And

If the call is connected, the calling mobile terminal calls the incoming mobile terminal; includes.

The present invention adds a call processing function of a mobile switching center to an A-interface protocol block controlling a protocol between a base station controller and a mobile switching center in a base station controller, or a separate block for performing a call processing function of a mobile switching center in a base station controller. In addition, the base station controller can handle calls between mobile terminals without interworking with the mobile switching center. If the A-interface protocol block to which the mobile switching center adds the call processing function or the separate block that performs the mobile processing station's call processing function is called the simulation block, the simulation block responds to the message transmitted from the base station controller to the mobile switching center. , Handle the call.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. 3 is a block diagram of a simulation block according to the present invention, and as shown, the originating base station 20 connected to the originating mobile terminal 10 through a radio link, the called mobile terminal 15 and the radio link. The base station 25 connected to the base station, and interworking with the call processing block of the base station controller 30 and the base station controller which processes the call between the mobile terminals through the source and destination base stations 20 and 25, It consists of a simulation block 35 that processes the call.

The simulation block 35 may be an A-interface protocol block of a conventional base station controller or a separate block. In order for the simulation block 35 to perform call processing, information for call processing must be stored. To this end, the simulation block 35 stores some of the information that the base station controller 30 reports to the mobile switching center on a separate storage medium.

For example, the base station controller 30 uses a plurality of vocoders, and assigns one vocoder to one call to modulate / demodulate the voice. If call setup is required, the mobile switching center may use the vocoder to be used by the base station controller 30. Will be assigned. The simulation block 35 transfers the vocoder status information (idle, busy, failure, etc.) that the state management block of the base station controller 30 periodically reports to the mobile switching center, and stores them in a separate storage medium.

When the base station controller 30 requests call setup, the simulation block 35 may allocate available vocoder to the base station controller by using the vocoder status information stored in the storage medium.

In addition, in order for the simulation block 35 to call the terminating mobile terminal 15, the position of the terminating mobile terminal 15 (the terminating base station) must be known. To this end, the simulation block 35 transmits the location registration information transmitted by all the mobile terminals through the base station controller 30 to the mobile switching center and stores them in a separate storage medium. The simulation block 35 can find the destination base station 25 and call the destination mobile terminal 15 using this location registration information.

The simulation block also treats call types as bypasses.

4 is a message flow diagram illustrating a method for setting up a call between mobile terminals according to the present invention. Hereinafter, operations and effects of the present invention will be described in detail.

When the mobile terminal 10 requests transmission from the base station controller 30 through the base station 20, the base station controller 30 transmits a message requesting a connection management service to the simulation block 35. (s205) The message requesting the connection management service includes subscriber information of the calling mobile terminal 10 and a telephone number of the called mobile terminal 15.

The simulation block 35 of the base station controller 30 uses the information contained in this connection management service request message to treat the calling subscriber as a normal subscriber and responds to the base station controller 30 with respect to the connection management service. (s210)

When the base station controller 30, which has received the access management service response, requests setup (S215), the simulation block 35 requests the allocation of radio resources to the setup request (s220). 30) periodically reports the status of the vocoder to the mobile switching center via the A-Interface protocol block. The simulation block 35 stores the state information of the vocoder reported by the base station controller to the mobile switching center, selects an available vocoder with reference to the stored vocoder state information, and allocates the selected vocoder.

The base station controller 30 receiving the radio resource allocation request allocates the vocoder, allocates the radio resource to the calling mobile terminal 10 through the calling base station 20, and then reports the completion of the allocation of the radio resource (s225). (S230)

The simulation block 35 searches for the terminating mobile terminal using the terminating telephone number transmitted from the originating party when the radio resource allocation of the calling party is completed. The simulation block 35 stores the location registration information of the mobile terminal which the base station controller 30 reports to the mobile switching center, and then refers to the base station 25 where the terminating mobile terminal 15 is located with reference to the stored location registration information. Selects and requests an incoming call to the selected base station 25 through the base station controller 30 (s235).

The base station controller 30, which has been requested for the incoming call, instructs the destination base station 25 to call the destination mobile terminal 15. The terminating base station 25 calls the terminating mobile terminal 15 and, if the terminating mobile terminal 15 answers, responds to the terminating call.

When the base station 25 responds to the incoming call, the base station controller 30 sends an incoming call response message to the simulation block (s240), and allocates radio resources to the destination mobile terminal through the destination base station (s245).

The base station controller 30 that has completed the allocation of radio resources reports to the simulation block 35 that the terminating mobile terminal 15 is waiting (As250).

Upon receiving the call waiting report, the simulation block 35 notifies the calling mobile terminal through the call base station that the call is waiting.

When the subscriber of the terminating mobile terminal 15 answers the call, the waiting base station controller 30 detects this through the terminating base station 25 and responds to the simulation block 35 (s260).

In response to the response, the simulation block 35 notifies the originating mobile terminal of the call connection through the originating base station (s265). The originating mobile terminal communicates with the called mobile terminal. At this time, the simulation block treats the call type as a bypass.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

Since the present invention can connect outgoing signals and incoming calls between mobile terminals without a mobile switching center, it is possible to develop and verify a base station / base station controller without normally connecting a base station controller and a mobile switching center, and to solve problems in development environment. There is an effect that can be solved.

Claims (9)

Requesting, by the mobile terminal, the call from the base station controller through the call base station; Requesting a connection management service from a call processing block of the base station controller; The simulation block responding to the call processing block in response to a connection management service; Requesting setup by the call processing block receiving the connection management service response; A simulation block, for the setting request, requesting allocation of radio resources; A call processing block receiving the request for allocation of radio resources, allocating radio resources to the originating mobile terminal through the originating base station, and reporting completion of radio resource allocation; Requesting an incoming call from a base station controller for completion of allocation of the radio resource by a simulation block; The call processing block, which is requested to receive the incoming call, calls the called mobile terminal through the called base station, and responds to the incoming call if the called mobile terminal answers; Allocating radio resources to a terminating mobile terminal through a terminating base station by a call processing block in response to an incoming call; Reporting, by the call processing block that has completed the allocation of radio resources, to the simulation block that the terminating mobile terminal is waiting; A simulation block, in response to the call waiting report, notifying a calling mobile terminal through an originating base station that an incoming call is waiting; If the waiting terminating mobile terminal responds, the call processing block notifying the simulation block of the incoming response; A simulation block informing, by the originating base station, of a call connection to the originating mobile terminal in response to the incoming response; And When the call is connected, calling the calling mobile terminal with the called mobile terminal; setting up a call between mobile terminals without a mobile switching center. The method of claim 1, wherein the simulation block, A method of establishing a call between mobile terminals without a mobile switching center, implemented in an A-interface protocol processing block of the originating base station controller. The method of claim 1, wherein the simulation block, And separately storing vocoder status information transmitted by the call processing block of the originating base station controller to the mobile switching center. The method of claim 1, wherein the simulation block, And separately storing the location registration information transmitted by the mobile terminal to the mobile switching center through the call processing block of the base station and the base station controller. The method of claim 1, wherein the responding to the connection management service comprises: A method of establishing a call between mobile terminals without a mobile switching center, processing outgoing call information of an originating mobile terminal included in a connection management service request as a normal subscriber and responding to the connection management service. The method of claim 1, wherein the requesting allocation of radio resources comprises: And assigning an available vocoder using the vocoder status information of the originating base station controller previously stored in the simulation block. The method of claim 1, wherein requesting the incoming call comprises: Using the location registration information of the destination mobile terminal stored in the simulation block, the location of the destination base station and the destination base station where the destination mobile terminal is located is determined, and the destination base station controller and the destination base station request an incoming call. How to set up a call between mobile terminals without a mobile switching center. The method of claim 1, wherein the step of informing the call connection, A method for establishing a call between mobile terminals without a mobile switching center, wherein a simulation block treats the call as a bypass. The originating mobile terminal requesting origination from the base station controller; The call processing block of the base station controller requesting origination from the simulation block; Connecting, by the simulation block, an originating mobile terminal and a destination mobile terminal in response to an originating request of the call processing block; And Calling, by the originating mobile terminal, with the terminating mobile terminal via the base station controller; establishing a call between mobile terminals without a mobile switching center.