KR20000051750A - Method for processing local call in case of faults occurring between mobile switching center and home location register - Google Patents

Abstract

PURPOSE: A method of processing local call, when difficulties between MSC(Mobile Switching Center) and HLR(Home Location Register) are found, is provided to process local call without any order of operator when the link between MSC and HLR has a difficulty. CONSTITUTION: A method of processing local call, when difficulties between MSC(Mobile Switching Center) and HLR(Home Location Register) are found, comprises the steps of; MSC requests location information of receiver mobile station to HLR, processing the call by using the receiving location information when received location information of receiver mobile station from HLR, requesting service information of receiver mobile station to VLR(Visitor Location Register) in MSC when failed to receive the information, processing the call by using the received service information when VLR respond, closing the process of the call when VLR doesn't respond.

Description

METHOD FOR PROCESSING LOCAL CALL IN CASE OF FAULTS OCCURRING BETWEEN MOBILE SWITCHING CENTER AND HOME LOCATION REGISTER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cellular mobile telecommunication system, and in particular, in case of a failure in a link between a mobile switching center (MSC) and a home location register (HLR), The present invention relates to a method for processing a local call in the event of a failure of a mobile switching center and a home location registration period, which can handle a local call without a command.

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 system, which can be applied to all kinds of wireless systems using Code Division Multiple Access (CDMA) technology, as shown in FIG. A mobile station (MS) 10 that provides a mobile communication service, a base station (BS) 20 that connects the mobile terminal 10 with a wireless link, and the base station 20 to another base station or It consists of a mobile switching center (MSC) 30 that connects to a Publish Switched Telephone Network (PSTN) 50.

The mobile switching center 30 retrieves the information of the subscriber of the mobile terminal 10 from the Home Location Register (HLR) 40 and provides a mobile communication service to the mobile terminal 10. In the code division multiple access (CDMA) system, the home location register 40 stores the location of the mobile terminal subscriber and supplementary service information. The mobile switching center 30 communicates with the home location register 40 by using a common channel signaling method (Common Channel Signaling No. 7: CCS No. 7) which is a standard signal processing protocol. To this end, the mobile switching center 30 is connected to the home location register 40 through a signal link using a common line signaling method.

FIG. 2 is a message flow diagram illustrating a call processing method of a mobile switching center according to the prior art.

When an incoming call is requested from any subscriber to the mobile terminal, the Mobile Call Control (MCC) block of the mobile switching center 30 is a Mobile call process shared library (MSL) block of the mobile switching center 30. Through (s105), the Roaming and Location Operation Execution (RLOE) block requests the location information of the called mobile terminal (s110).

The RLOE block requests the location information of the destination mobile terminal from the home location register 40 through the signal link by the common line signaling method (s115), and the home location register 40 stores the location information of the destination mobile terminal in the database. (S120) The RLOE block forwards the received destination location information to the MCC block (s125), and the MCC block stores the location information in the MSL block (s130). Instructs to request the incoming service information based on the incoming location information (s135). The MSL block requests the service information of the terminating mobile terminal from the location registration call control (LCC) block of the mobile switching center by the command of the MCC block (s140).

When the LCC block answers the incoming service information to the MCC block (s145), the MCC block stores the incoming service information in the MSL block (s150), and then calls the incoming mobile terminal using the stored destination location information and the incoming service information. .ss

As described above, the mobile switching center 30 uses the information received from the home location register 40 to provide an incoming service. If a failure occurs in the signal link between the mobile switching center 30 and the home location register 40, the RLOE block of the mobile switching center cannot receive the incoming location information from the home location register. In this case, the MCC block uses its own timer, and if the location information is not answered until the timer expires after requesting the destination location information, the MCC block ends the call processing.

However, if the terminating mobile terminal is in the area of the mobile switching center, i.e. for domestic call processing, the Visitor Location Register (VLR) in the mobile switching station already has subscriber information of the terminating mobile terminal. However, even in this case, the mobile switching center performs a request for subscriber information to the home locator, and if the subscriber information is not answered from the home locator, the call has no choice but to end.

In the prior art call processing method operating as described above, when the signal link connecting the mobile switching center and the home location registration period has failed, or when the mobile switching center does not receive subscriber information from the home location register, Even in the case of a local call that does not require subscriber information of the location register, there was a problem that call processing could not proceed anymore.

Accordingly, an object of the present invention, which is designed to solve the problems of the prior art operating as described above, is to receive incoming service information stored in the visitor location register of the mobile switching center when a signal link between the mobile switching center and the home location registration period occurs. The present invention provides a method for processing a home call in the event of a failure of a home location registration period with a mobile switching center, which performs call processing within a home country.

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

2 is a message flow diagram illustrating a call processing method of a mobile switching center according to the prior art.

3 is a message flow diagram illustrating a call processing method of a mobile switching center according to the present invention;

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

10: mobile terminal 20: base station

30: mobile switching center 40: home location register

50: public switched telephone network

An embodiment of a method for processing a local call in the event of a failure of a mobile switching center and a home location registration period according to the present invention, which has been devised to achieve the above object,

When the mobile switching center is requested to process the incoming call, requesting, by the mobile call control (MCC) block, the home location register to request location information of the incoming mobile terminal;

If the incoming location information is not received until a certain time has passed, the MCC block requesting the visitor location register of the mobile switching center for the service information of the incoming mobile terminal;

The visitor location register responding to the MCC block the incoming service information; And

And calling, by the MCC block, the called mobile terminal using the received called service information.

Another embodiment of the local call processing method in the event of a failure of the mobile switching center and the home location registration period according to the present invention,

When the mobile switching center is requested to process the incoming call, the call processing (MCC) block of the mobile switching center requesting the home location register for the location information of the incoming mobile terminal;

If an error occurs in the signal link between the mobile switching center and the home location registration period, the MCC block requesting incoming service information from the visitor location register of the mobile switching center;

The visitor location register responding to the MCC block the incoming service information; And

And calling, by the MCC block, the called mobile terminal using the received called service information.

Another embodiment of the local call processing method in the event of a failure of the mobile switching center and the home location registration period according to the present invention,

If the mobile switching center is requested to process the incoming call, requesting the mobile switching center for location information of the incoming mobile terminal from the home location register;

When the location information of the called mobile terminal is received from a home location register, processing the call using the called location information;

Requesting service information of the destination mobile terminal from the visitor location register of the mobile switching center if the location information of the destination mobile terminal is not received from the home location register;

If the visitor location register answers the service information of the incoming mobile terminal, processing the call using the incoming service information; And

If the visitor location register does not respond to the service information of the incoming mobile terminal, terminating the processing of the call.

According to the present invention, if the mobile switching center does not receive the location information of the incoming mobile terminal from the home location register, or if a failure occurs in the common line signaling signal link between the mobile switching center and the home location registration period, the mobile switching center unconditionally transmits to the visitor location register. Request service information of the called mobile terminal.

This method allows for a call with a terminating mobile terminal, which may be at least within the country. If the terminating mobile terminal is in the home country, the visitor location register responds with the service information of the terminating mobile terminal. The mobile switching center may then process the call using the incoming service information received from the visitor location register.

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 message flow diagram illustrating a call processing method of a mobile switching center according to the present invention.

If a set-up of an incoming call is requested from any subscriber to the mobile terminal, in step s205, the mobile call control (MCC) block of the mobile switching center is a call processing shared library (mobile call process) of the mobile switching center. The shared library (MSL) block sends pd_Send_RLH_LocRQr to request location information of the called mobile terminal.

At this time, the MCC block requests the location information of the called mobile terminal by using a unique number (such as a telephone number or an electronic serial number) of the called mobile terminal.

In step s210, the MSL block, which has received the incoming location information from the MCC, sends the MS_RLH_CLocReqr to the Roaming and Location Operation Execution Block (LOLO) of the MS, and requests the called location information.

The RLOE block, which has received the incoming location information in step S210, checks whether a failure occurs in the signal link between the mobile switching center and the home location registration period. To this end, the RLOE block requests the incoming location information from the home location register and drives a first timer set to a constant time. In step S220, if the home location register does not respond to the incoming location information until the first timer expires, the RLOE block determines that a signal link between the mobile switching center and the home location registration period has failed.

If it is determined that a failure has occurred in the signal link between the mobile switching center and the home location registration period, in step s225, the RLOE block sends an MS_ASE_CancelRP to the MCC block to indicate that the destination location registration request has failed.

Apart from the operation of the RLOE block, the MCC block requests the incoming location information in step s205 and drives a second timer set at a constant time.

If the RLOE block does not respond to the destination location information until the second timer expires, or if the destination location information request from the RLOE block has been reported in step s225, the MCC block in step s230 sends an MSL block to the MSL block. Sends pd_SendMS_CdSvcInfoRQ and instructs to request incoming service information.

In step s235, the MSL block requests the service information of the called mobile terminal from the location registration call control (LCC) block of the visitor location register (VLR).

If the terminating mobile terminal is currently located within the area of the mobile switching center, the visitor locator will contain the service information of the terminating mobile terminal. Then, in step S240, the LCC block of the visitor location register sends MS_CdSvcInfoRP to the MCC block, and responds to the incoming service information.

When the LCC block answers the incoming service information to the MCC block, in step s245, the MCC block stores the incoming service information in the MSL block, and then in step s250, the incoming mobile terminal using the incoming service information stored in the MSL block. Call

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.

According to the present invention, when the mobile switching center cannot receive the location information of the incoming mobile terminal from the home location register, or an abnormality occurs in the signal link between the mobile switching center and the home location registration period, the mobile switching center unconditionally moves the incoming location to the visitor location register of the mobile switching center. Request service information of the terminal. Therefore, the present invention has the effect of enabling a call with at least a receiving mobile terminal which may be at least within the country.

Claims (12)

When the mobile switching center is requested to process the incoming call, requesting, by the mobile call control (MCC) block, the home location register to request location information of the incoming mobile terminal; If the incoming location information is not received until a certain time has passed, the MCC block requesting the visitor location register of the mobile switching center for the service information of the incoming mobile terminal; The visitor location register responding to the MCC block the incoming service information; And And calling, by the MCC block, the called mobile terminal using the received incoming service information. 6. The method of claim 1, wherein the MCC block requests the destination location information from the home location register, Requesting, by the MCC block, call location information from a mobile call process shared library (MSL) block of a mobile switching center; The MSL block requesting called location information from a Roaming and Location Operation Execution (RLOE) block of a mobile switching center; And Requesting the called location information from the home location register by the RLOE block. The method of claim 1, wherein the MCC block requests the destination service information from the visitor location register, Instructing the MCC block to request incoming service information from the MSL block of the mobile switching center; Requesting, by the MSL block, a location registration call control (LCC) block of the visitor location register, for incoming service information. The method of claim 1, wherein the visitor location register responds to the incoming service information, The visitor location register searching for service information of the called mobile terminal; And if the service information of the called mobile terminal exists, responding the retrieved service information of the called mobile terminal to the MCC block. The method of claim 1, wherein the step of calling the incoming mobile terminal, Storing, by the MCC block, incoming service information in an MSL block of a mobile switching center; And calling, by the MCC block, an incoming mobile terminal using the stored incoming service information. 6. When the mobile switching center is requested to process the incoming call, the call processing (MCC) block of the mobile switching center requesting the home location register for the location information of the incoming mobile terminal; If an error occurs in the signal link between the mobile switching center and the home location registration period, the MCC block requesting incoming service information from the visitor location register of the mobile switching center; The visitor location register responding to the MCC block the incoming service information; And And calling, by the MCC block, the called mobile terminal using the received incoming service information. 6. The method of claim 6, wherein the MCC block requests the destination location information from the home location register, Requesting, by the MCC block, the called location information from the call processing shared library (MSL) block of the mobile switching center; The MSL block requesting called location information from a roaming / location information operation (RLOE) block of a mobile switching center; And Requesting the called location information from the home location register by the RLOE block. The method of claim 6, wherein the MCC block requests the incoming service information from the visitor location register, After the RLOE block of the mobile switching center requests the destination location information from the home location register, if the destination location information is not received until a certain time passes, the RLOE block reports that the request of the destination location information has failed to the MCC block. Steps; The MCC block recognizes that the request of the destination location information has failed, and requesting the destination service information from the visitor location register. The method of claim 6, wherein the MCC block requests the incoming service information from the visitor location register, Instructing the MCC block to request incoming service information from the MSL block of the mobile switching center; Requesting, by the MSL block, the location service call control (LCC) block of the visitor location register, the destination service information. The method of claim 6, wherein the visitor location register responds to the incoming service information. The visitor location register searching for service information of the called mobile terminal; And if the service information of the called mobile terminal exists, responding the retrieved service information of the called mobile terminal to the MCC block. The method of claim 6, wherein the step of calling the incoming mobile terminal, Storing, by the MCC block, incoming service information in an MSL block of a mobile switching center; And calling, by the MCC block, an incoming mobile terminal using the stored incoming service information. 6. If the mobile switching center is requested to process the incoming call, requesting the mobile switching center for location information of the incoming mobile terminal from the home location register; When the location information of the called mobile terminal is received from a home location register, processing the call using the called location information; Requesting service information of the destination mobile terminal from the visitor location register of the mobile switching center if the location information of the destination mobile terminal is not received from the home location register; If the visitor location register answers the service information of the incoming mobile terminal, processing the call using the incoming service information; And If the visitor location register does not respond to the service information of the incoming mobile terminal, terminating the processing of the call.