KR20010047967A - Call process method of mobile exchange system - Google Patents

Abstract

PURPOSE: A method for processing a call of an MSC(Mobile Switching Center) is provided to change an inner switching connection point between a transmitting terminal and a receiving terminal. Therefore, it is possible to reduce system load caused by a wireless resource assignment failure. CONSTITUTION: When a receiver ASS(Access Switching Subsystem) receives a call confirmed message from a receiver BSC(Base Station Controller), a wireless resource setup is requested to the receiver ASS. If a wireless resource assignment process between the receiver BSC and a mobile telephone is completed, the receiver ASS notifies a transmitter ASS of that a receiving mobile telephone is founded. The transmitter ASS requests an inner communication path setup between a transmitting terminal and a receiving terminal to an INS(Information Network System), and transmits switching connection information to the receiver ASS. If an alarm message notifying that the receiving mobile telephone is called is received, the receiver ASS confirms whether communication path occupying information is received. If so, receiver ASS delivers a receiving call message to the transmitter ASS. After delivering the receiving call message, the receiver ASS controls a time switch, and supplies a ring back tone signal to a transmitter mobile telephone.

Description

Call processing method of mobile exchange system {CALL PROCESS METHOD OF MOBILE EXCHANGE SYSTEM}

The present invention relates to a call processing method in a mobile switching system, and more particularly, to a call processing method performing a call processing by changing a switching connection point in consideration of a radio resource failure between an originating terminal and a receiving terminal.

In general, a mobile switch uses a switching connection to form a communication path between a calling terminal and a called terminal.

1 is a block diagram of a conventional digital mobile switching network.

The mobile network includes a switching center comprising a mobile switching center (MSC) 100 as a switch, a home location register (HLR) 106 as a location register, and a plurality of base station controllers (BSCs) 108 as base station controllers, and each BSC. It is composed of a plurality of base transceiver station (BTS) (110) which is a base station connected to (108), and is connected wirelessly with a plurality of mobile phones (112) Public Switched Telephone Network (PSTN) (104) And a public land mobile network (PLMN) 102. The BSC 108 performs radio link and wired link control, hand-off functions. The BTS 110 configures a wireless communication path together with the mobile phone 112 and manages radio resources. HLR 106 performs a subscriber location registration function. The MSC 100 is an ASS having a time switch connected to an E1 link, an INS having a space switch connected to the ASS, a time switch connected to the INS, and an ASS having an E1 trunk connected to the time switch. Consists of.

2 is a call processing flowchart of a conventional mobile exchange.

The mobile switching system performs an internal switching process (SwConRP and SwConRP) upon receiving a paging response signal from the BSC 108 that manages the destination mobile terminal. Here, the internal switching process connects the time switch connected to the calling terminal in the mobile switching system and the time switch connected to the called party with a space switch to form a communication path between the calling terminal and the called terminal when the called terminal answers. It means doing. Of course, if the calling terminal and the called terminal exist in the same access switching subsystem (ASS), some calls may be serviced through intra-junction in the ASS without passing through the space switch. When the called party location is determined and the call setup is completed, the called party BSC 108 transmits an incoming signal to the MSC 100 when the called terminal is called. The called party ASS, which has received this, transmits a ringing back tone from the called party ASS to the calling party through internal switching of the MSC 100 already set. Then, when the called terminal answers, it stops the ringback tone transmission and connects the communication paths to form a communication path between the two terminals. However, air resource setting is not 100% perfect in mobile phone call. That is, since the BSC 108 and the radio call set up in the mobile terminal are relatively many messages such as channel assignment message, T channel, preamble, BS Ack Order, Service Option Response Order, etc. There are many chances of failure.

However, if there are many failures to set up a call on the air like this, the internal switching process already set in the mobile system becomes meaningless, and the set switch must be restored to free state, since the switching connection and recovery process have to go through a complicated process. There was a problem that put unnecessary load on the system.

Accordingly, an object of the present invention is to provide a call processing method that can reduce the load of the system due to radio resource allocation failure by changing the internal switching connection time point of the originating and receiving terminal period in the mobile switching system.

A method for processing a call in a mobile switching network of the present invention for achieving the above object, the method comprising: requesting radio resource setting to a called party BSC when receiving a call confirmation message from a called party BSC at a called party ASS; Requesting that the mobile station allocates the incoming mobile phone from the called party ASS to the calling party ASS when the radio resource allocation process is successfully completed in the calling party BSC and the mobile phone period, and the called mobile phone from the calling party ASS. Requesting the internal call between the calling and receiving terminals to be sent to the INS and transmitting the switching connection information to the incoming ASS when receiving a notification that the device is found, and upon receiving an alarm message indicating that the called mobile phone is being called. Checking whether the occupancy information is received in the call from the called party ASS, and when the occupancy information is received in the call, from the called party ASS to the calling party ASS. And transmitting a ringback tone signal to a calling party's mobile telephone by controlling a time switch in the called party's ASS after sending the incoming call message.

1 is a block diagram of a conventional digital mobile switching network

2 is a call processing flow diagram for a conventional mobile exchange.

3 is a call processing control flow diagram for a mobile exchange according to an embodiment of the present invention,

4 is a flowchart illustrating a switching process control according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The mobile switching network for implementing the present invention has the same configuration as that in FIG.

3 is a call processing control flowchart for a mobile telephone according to an embodiment of the present invention,

4 is a flow chart of a switching process control according to an embodiment of the present invention.

A switching processing method according to an embodiment of the present invention will be described with reference to FIGS. 3 and 4.

If the set up message is sent from the called ASS to the BSC 108 during the call processing operation, the BSC 108 sends a Call Confirmed message to the called party ASS and enters the standby state at step 100. Then, when the called party ASS receives the Call Confirmed message from the called party BSC 110, it transmits an Assigment Request to the called party BSC 110 in step 102 and allocates radio resources between the BSC 108 and the called mobile phone 112. In step 200, it transitions to the standby state as a result of the radio resource allocation. Then, as shown in FIG. 2, when the called party BSC sends a channel assignment signal to the mobile phone 112, the called BSC transmits a T channel preamble signal to the BSC 108 from the mobile phone 112. The destination BSC 108 transmits a BS Ack Order signal to the mobile phone 112. The called party BSC 108 then sends an MS Ack Order back to the BSC 108. The BSC 108 then sends a service option response order to the mobile phone 112. In this way, if the radio resource allocation succeeds, in step 201, the BSC 108 transmits a radio resource allocation completion signal to the called side ASS to the called side ASS.

However, in this case, when the radio resource allocation fails, the called party ASS receives an assignment failure from the called BSC in step 202, and notifies the calling party ASS that the radio resource allocation has failed in step 204. In step 400, the state of the arc transitions to the idle state.

If the radio resource allocation is successful, in step 203, the called party ASS sends a CdPageRP signal to the calling party ASS, notifying that the called location detecting process is normally performed, and in step 300, it switches to the switching occupancy information waiting state. At this time, when the switching occupation information (SwSzInfRP) is received from the calling party ASS, the called party ASS stores the received data in step 303, and proceeds to step 500 to transition to the called alarm waiting state.

Referring to the operation of receiving the switching occupation information, the originating side ASS sends the switching control request signal SwConRQ to the INS, and the INS sends the switching control response signal SwConRP to the originating side ASS. The calling party ASS then sends the switching connection information (CdSzInfRP) to the called party ASS.

Then, when the receiving party ASS receives the message (Alerting) indicating that the called party is receiving from the called party BSC 108 in step 501, it sends an incoming call message (AlertingRP) to the calling party BSC 108 in step 502. do. And the receiving side ASS is to supply the ring back tone (Ring Back Tone) to the calling mobile phone (112). At this time, when the called party's mobile phone responds and receives a connection message from the called BSC, the called party ASS makes a call switching connection and blocks the ringback tone.

However, when the receiving side ASS receives an incoming message from the BSC in step 302 in step 302, the called party ASS sends an AlertingRP message to the calling side ASS in step 302 and transitions to waiting mode 1 for switching occupation information in step 600. Then, when receiving the switching occupancy information (SwSzInfRP) in step 601, a ringing back tone is supplied to the calling party ASS.

As described above, the present invention does not perform a process for recovering unnecessary internal call paths by notifying the originating ASS about radio allocation failure messages that frequently occur when allocating radio resources between the called party BSC and the mobile telephone period. In addition, it is possible to efficiently reduce the load due to the switching of the system due to the radio resource allocation failure.

Claims (3)

In the call processing method in the mobile switching network, Receiving a call confirmation message from the called party's BSC at the called party's ASS, and requesting radio resource setting to the called party's ASS; Requesting the radio resource setting and notifying that the called mobile phone is found from the called party ASS to the calling party ASS when the radio resource allocation process is successfully completed in the called party BSC and the mobile phone period; Requesting the internal call between the calling and receiving terminals to be sent to the INS and transmitting the switching connection information to the called ASS when the calling party's ASS is notified that the called mobile phone is found; When receiving an alarm message indicating that the called mobile phone is being called, checking whether or not the occupation information is received by the call from the called party's ASS; Transmitting an incoming call message from the called party ASS to the calling party ASS when the occupancy information is received in the call; And transmitting a ringback tone signal to a calling party's mobile telephone by controlling a time switch in the called party's ASS after transmitting the incoming call message. The method of claim 1, Transmitting an incoming call message to the calling party ASS when the occupancy information is not received through the call; And transmitting a ringback tone to an outgoing mobile telephone by transmitting the incoming call outgoing message and controlling the time switch of the incoming ASS when the internal switching connection information is received. The method of claim 1, And requesting the radio resource setting to notify the source side ASS of the radio resource allocation failure and transition to an idle state when the radio resource allocation process fails in the called party BSC and the mobile telephone period. Call handling method of mobile switching system.