KR19990053162A - Local Call Control Method in Mobile Communication Switch - Google Patents

Abstract

The present invention relates to a mobile communication switch (IMT-2000), and to a call control method for a local call, which is a case where an IMT-2000 mobile subscriber makes a call by calling a mobile subscriber of another IMT-2000 in the same exchange. It is about.

In the local call service through the mobile communication switch of the prior art, there is a problem in that a voice-oriented service is provided and a separate processing procedure is required for data service and a method that does not use international standardization is used. In addition, in the local call service through the asynchronous transfer mode (ATM) switch of the prior art, by supporting only the communication in the fixed subscriber, there is a problem that does not fit the mobile environment. Accordingly, in order to solve the above-described problem, the present invention provides a process from the subscriber's call attempt of the IMT-2000 to the home call determination, the process from the home call determination to the exchange internal call allocation, and the exchange internal call allocation. During the call, during the call, if the subscriber of the incoming IMT-2000 recovers first, the related resources are released and the call is terminated. If the calling IMT-2000 subscriber recovers first during the call, the related resources are released. The call is terminated. By such a call control method, it is to provide an efficient local call service in IMT-2000.

Description

Local Call Control Method in Mobile Communication Switch

The present invention relates to an IMT-2000 mobile communication switch, and more particularly, to a call control method for a local call when an IMT-2000 mobile subscriber makes a call by calling another IMT-2000 mobile subscriber in the same exchange.

The conventional mobile communication exchange provides a voice-oriented service based on a low transmission rate, and requires a separate processing procedure for data service. In addition, the lack of international standards has limited communication services to a specific region or country. On the other hand, ATM exchanger, which is currently developed at home and abroad based on Asynchronous Transfer Mode (hereinafter referred to as ATM), supports only the communication in fixed network, thereby making it possible to connect the data-oriented terminal without the mobile environment. The general user using the service is inconvenient to use at a low price.

Therefore, in order to solve the above problems, the present invention adds a mobility characteristic to an ATM switch capable of accommodating terminals having different transmission speeds such as voice, data, and video in a delivery network environment using an ATM scheme, By devising its own call processing method in the exchange according to the international standardization standard, it is possible to overcome the local limitations of the call and provide multimedia services, and to move the IMT-2000 subscribers within the same IMT-2000 mobile communication switch more efficiently. The purpose is to provide communication services.

The present invention for achieving the above object is provided with a mobile terminal, a base station, a control station, a mobile communication switch, a visited location register, the present subscriber location register and an authentication center, wherein the mobile switch is a mobile subscriber matching ATM local switching subsystem. In a next-generation mobile communication system comprising a protocol processing ATM local switching subsystem and an ATM central switching subsystem, a mobile call control method of a local station in the same exchange where a mobile subscriber of a mobile communication originates and arrives at a mobile subscriber of a mobile communication network, The first process from the mobile subscriber's call attempt to the home call determination, the second process from the home call determination to the exchange internal call allocation, the third process from the internal call exchange to the busy call, and during the call When the called mobile subscriber recovers first, it releases the related resources and terminates the call. And a fifth process of releasing related resources and terminating the call when the originating mobile communication subscriber recovers first during a call.

1 is a structural diagram of an IMT-2000 mobile communication system to which the present invention is applied;

2 is a diagram illustrating a call control procedure from mobile subscriber origination to local call determination according to the present invention.

3 is a diagram illustrating a call control procedure from local call determination to internal exchange in an exchange according to the present invention.

4 is a diagram illustrating a call control procedure from call assignment to exchange internal call according to the present invention until the call.

5 is a diagram illustrating a call control procedure when a called party recovers first during a call according to the present invention.

6 is a diagram illustrating a call control procedure when the calling subscriber recovers first during a call according to the present invention.

<Description of Signs of Major Parts of Drawings>

101: control station (BSC) 102: mobile communication switch (MSC)

103: Visited Location Register (VLR) 104: Main Location Register (HLR)

105: authentication center (AC)

106: Mobile subscriber match ATM local exchange subsystem (ALS_M)

107: Protocol Processing ATM Local Exchange Subsystem (ALS_P)

108: ATM Central Switching Subsystem (ACS)

111: Call and Connection Control Processor (CCCP)

112: Operation and Maintenance Processor (OMP)

113: user part matching (UPI) 114: user part control (UPC)

115: Mobile Application Protocol Control (MPC)

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

1 is a block diagram of an IMT-2000 mobile communication system to which the present invention is applied.

The configuration of the IMT-2000 mobile communication system includes a base station controller (BSC) 101, a mobile switching center (MSC) 102, a visitor location register (VLR) ( 103), a Home Location Register (HLR) 104, and an Authentication Center (AC) 105.

The detailed description of each such configuration is as follows.

The control station (BSC) 101 is located between the base station transceiver subsystem and the switch to control the base station and provide a call path.

The mobile communication exchange (MSC) 102 performs call control and bearer control between subscribers.

The visited subscriber location register (VLR) 103 stores and manages subscriber information visited by the mobile communication area.

The present subscriber location register (HLR) 104 stores and manages the present subscriber information belonging to the IMT-2000 network.

The authentication center (AC) 105 performs an authentication function for the IMT-2000 subscriber.

Meanwhile, the MSC 102 is an ATM Local Switching Subsystem for Mobile Subscriber (ALS_M) 106 and an ATM Local Switching Subsystem for Protocol. ALS_P) 107, an ATM Central Switching Subsystem (ACS) 108.

First, the subscriber matched ATM local exchange subsystem (ALS_M) 106 performs call control and bearer control for the IMT-2000 subscriber. Next, the protocol processing ATM local switching subsystem (ALS_P) 107 performs protocol processing functions in registration with the present subscriber location register, the visited subscriber location register, and the authentication center. The ATM Central Switching Subsystem (ACS) 108 then performs functions such as operational integrity and ATM central switch control.

The subscriber matching ATM local switching subsystem (ALS_M) 106 and the protocol processing ATM local switching subsystem (ALS_P) 107 are matching modules (I / I) for matching with physical entities external to the exchange through an ATM network. F Module (109), Local ATM Switch (110) for connecting the inside of the exchange, and Call and Connection Control Processor (CCCP) 111 for performing call control and connection control functions. It is composed of

The Call and Connection Control Processor (CCCP) 111 inside the subscriber matched ATM local switching subsystem (ALS_M) 106 has a digital subscriber signal 2 (Digital Subscriber Signal 2), which is a signaling method of the exchange with the control station. Subscriber Signaling 2) and User Particle Interface (UPI) 113 which performs message conversion function between the Inter Processor Communication (IPC) signal inside the exchange and the subscriber that performs mobile subscriber call processing and connection control functions. There is a User Processor Control (UPC) 114 block. The subscriber station control block includes a library for performing number translation, switch internal switch path management, virtual path identifier and virtual channel number assignment, and external switch management. have.

The call and connection control processor inside the protocol processing ATM local switching subsystem (ALS_P) 107 includes a mobile application protocol (MAP), which is a communication protocol between the present subscriber location register, the visited subscriber location register, the authentication center, and the exchange period. There is a MAP Protocol Control (MPC) block 115 which performs a function for controlling the &lt; RTI ID = 0.0 &gt;

FIG. 2 relates to a call control procedure from an origination attempt when a IMT-2000 subscriber attempts to a call to an IMT-2000 subscriber of its own country to a roaming number translation result.

After an IMT-2000 subscriber attempts an outgoing call to an IMT-2000 subscriber in its own country, it goes through BSCo (meaning calling BSC) and UPIo (meaning calling UPI) in the IMT-2000 exchange. If the terminal setup permission request is received, the VLR is notified to the VLR via the MPC (the description of the MPC in the flowchart description below). The VLR marks the status of the terminal as outgoing and prevents an incoming call from being attempted by an outgoing subscriber, performs authentication, encryption, and Temporary Mobile User Identifier (TMUI) assignment procedures (202). Information for determining the terminal setting permission is notified (203). If the terminal setup is normally allowed and UPCo receives the call setup request from BSCo (204), it requests the call setup permission of the calling subscriber to the HLR (205). Upon receiving call establishment allowance information of the originating subscriber from the HLR (206), UPCo performs anomaly processing if the subscriber is not allowed to originate (207) and notifies the BSCo that the call should continue if the subscriber is allowed to originate. Notify the call progress (208). In addition, the base station allocates an access link and a virtual channel on the link with the BSCo during the switching period (209), requests the access link to the BSCo (210), and receives a response (211). The UPCo analyzes the network identification number (212), and if it is another incoming call as a result of the analysis, performs the incoming call processing (213). In the case of a call that is received by a mobile subscriber belonging to the IMT-2000 network, when the HLR requests routing information indicating to which exchange the called subscriber is located (214), the mobile subscriber roaming number (MSRN) Routing information including) is received by the UPCo (215). The UPCo translates this number (216) and recognizes that the call is coming to an IMT-2000 subscriber in its country (217). If it is not the local call, the incoming call processing to the other station in its own IMT-2000 network is performed (218).

FIG. 3 relates to a call control procedure from identification of a home call to allocation of an internal call in an exchange when an IMT-2000 subscriber attempts to call a home IMT-2000 subscriber.

If UPCo requests the incoming routing requesting the VLR to verify the location of the called party (301), the VLR examines the call constraint and then requests the called party page to the BSCt if incoming is allowed (302), and responds to it. Notify (303), and confirms the response to the BSCt (304). Thereafter, after authentication, encryption, and user temporary number (TMUI) allocation procedures are sequentially performed between the terminal and the network (305), the VLR notifies the UPCo that the incoming routing is terminated (306). The UPCo examines a link that can satisfy the call requested by the user among the links connected to the central ATM switch connected to it to set up a call path inside the exchange, and reserves the available candidate ATM switch links (307). The incoming call setup request 308 notifies this to the UPCt (meaning the called party UPC) through the message (308). The UPCt selects an optimal ATM switch link in consideration of the link state accommodated in the terminating switch module among the received candidate ATM switch links, and allocates the virtual path and the virtual channel on the terminating link (309). The switch link information and the virtual path and virtual channel information are notified to the UPCo (310). The UPCo releases the link reservation for all but the selected one of the candidate ATM switch links (311). Through the above process, the call path between ATM switches in the exchange is secured.

FIG. 4 relates to a call control procedure from an IMT-2000 subscriber to an IMT-2000 subscriber in his / her country, when the IMT-2000 subscriber attempts to make a call, and assigns it to the internal call of the exchange.

After performing step 310, the UPCt requests an incoming call to the HLR to query the call restriction condition of the called user (401), and when receiving a response (402), through the result value in this message If it is a call restriction condition, abnormal processing is performed (403), otherwise, the call setup is requested to BSCt (meaning the called party BSC) (404). In addition, the BSCt is allocated an access link and a virtual channel on the link during the switching period (405), requests an access link to the BSCt (406), and receives a response (407). Thereafter, a 'report (alert) request' indicating that a ring is ringing from the BSCt is transmitted to the BSCo via the UPCt and the UPCo (408). Then, the destination UPCt updates the destination cell header conversion table using the physical address information, the virtual path, and the virtual channel of the source switch (409), and the source UPCo transmits the physical address information, the virtual path, and The source cell header conversion table is updated using the virtual channel (410). This establishes a call path between the calling party and the called party. In this state, when the called subscriber responds, a call setup notification is received from the BSCt and transmitted to the BSCo via the UPCt and the UPCo (411), and the response is transmitted from the UPCt to the BSCt (412). 5 is a call control procedure when an incoming IMT-2000 subscriber first recovers a call while an IMT-2000 subscriber originates and is in a call with an IMT-2000 subscriber of its own country.

When the call is established through the call control procedure of FIGS. 2, 3, and 4 and the incoming IMT-2000 subscriber first disconnects the call while the service is being performed, the release request signal is received from the BSCt to the UPCt (501). UPCt requests originating release by UPCo (502), virtual path and virtual channel de-assignment (503) as part of resource release of exchange called party, and destination cell head conversion table value by matching module (I / F Module) The release request 504, the ATM switch link release 505, and the UNI resource deassignment 506 are performed in this order. The BSCt is notified that the resources of the called party of the exchange have been released (507), and the HLR is requested to disconnect the called user call (508). Upon receiving a response from the HLR (509), the UPCt requests (510) the BSCt for an access link release established outside the exchange (510) and is informed of the response (511) from the BSCt. When the BSCt performing the procedure 511 requests the VLR to the VLR through the exchange in order to release the association between the UE and the network (512), the VLR releases the association information and sets the UE association release request. The response is notified to the BSCt (513).

On the other hand, the UPCo receiving the source release request by the procedure 502, the virtual path and virtual channel de-assignment 514, as a part of the resource release of the exchange sender, the requesting party release of the cell head conversion table value to the matching module. 515, ATM switch link release 516, UNI resource deallocation 517 procedures are performed in sequence, and the calling party release request is made to the BSCt (518). When the UPCo receives a response from the BSCo (519), it requests the truncation of the outgoing user call to the HLR (520), and when it receives a response from the HLR (521), the UPCo releases the access link release established outside the exchange. Request 522 and receive a response from the BSCo (523). If the BSCo performing the procedure 523 requests the VLR through the exchange to release the association between the UE and the network, the VCo releases the association information and sets the UE release request. Notify BSCo of the response to 525. In the above procedures (512), (513), (524), and (525), the exchange is only responsible for transparently transmitting through the UPI and MPC blocks without looking into the signals transmitted between the BSC and the VLR. This procedure terminates the home call service.

FIG. 6 is a call control procedure when an originating IMT-2000 subscriber first recovers a call while an IMT-2000 subscriber originates and is in a call with an IMT-2000 subscriber of its own country.

When the call is established through the call control procedure shown in FIGS. 2, 3, and 4 and the originating IMT-2000 subscriber first disconnects the call while the service is being performed, the release request signal is received from the BSCo to the UPCo (601). UPCo requests the called party release with UPCt (602). Virtual path and virtual channel de-allocation (603), matching modulo destination side cell head translation table value release request (604), ATM switch link release (605), UNI resource de-allocation (606) as part of resource release at exchange source. The procedure is performed in turn, notifying the BSCo that the resource of the calling party of the exchange has been released (607), and requesting the disconnection of the incoming user call to the HLR (608). Upon receipt of a response from the HLR (609), the UPCo requests the BSCo for access link release established outside the exchange (610) and is informed of the response (611) from the BSCo. If the BSCo performing the procedure 611 requests the VLR to the VLR through the exchange to release the association between the UE and the network (612), the VLR releases the association-related information that has been set and the UE release request. Notify BSCo of the response (613).

On the other hand, the UPCt that has received the called party release request by the procedure (602) performs the virtual path and virtual channel allocation 614 as part of resource release of the exchange called party. 615, ATM switch link release 616, UNI resource deallocation 617 procedures are performed in sequence, and the called party release is requested to BSCt (618). When the UPCt receives a response to it from the BSCt (619), it requests the truncation of the originating user call to the HLR (620), and when it receives a response from the HLR (621), the UPCt cancels the access link release established outside the exchange. Request 622 and receive a response from the BSCt (623). When the BSCt performing the procedure 623 requests the VLR through the exchange to release the association between the UE and the network (624), the VLR releases the association information and sets the UE release request. Notify the response to the BSCt (625). In the above procedures 612, 613, 624, and 625, the exchange only plays a transparent role through the UPI and MPC blocks without looking into the signals transmitted between the BSC and the VLR. This procedure terminates the home call service.

As described above, the present invention relates to a procedure and method inside an exchange for a home call in a case where an IMT-2000 subscriber attempts to call an IMT-2000 subscriber in an identical exchange in an IMT-2000 next-generation mobile communication exchange based on an ATM environment. It is about. In this way, by processing local calls of ATM-based IMT-2000 exchanges, the following outstanding effects can be obtained.

First, by considering the specifications between the network components outside the exchange currently being standardized by the International Organization for Standardization, there is no conflict between the method of local call processing inside the exchange and the direction of standardization targeting the network components outside the exchange. This has the effect of making the exchanger implemented by the present invention internationally competitive.

Second, by applying the concept established through the present invention to the ongoing international standardization work, it is possible to actively respond to the standardization trend and to verify it.

Third, the conventional mobile communication switch is mainly voice service and requires a separate processing procedure for data service, but according to the present invention, a multimedia service capable of processing not only voice and data but also image information is possible. There is an effect that the processing procedure can be integrated and handled in the native call processing procedure without separation.

Claims (6)

A mobile terminal, a base station, a control station, a mobile switching center, a visited location register, a subscriber location register, and an authentication center, wherein the mobile switching center is a mobile subscriber matching ATM local switching subsystem, protocol processing ATM local switching subsystem, ATM In the next-generation mobile communication system composed of a central switching subsystem, the local call control method in the same exchange that the mobile subscribers of the mobile communication network is called to the mobile subscribers of the mobile communication network, A first process from call attempt of a mobile subscriber to local call determination; A second process from the determination of the home call to the assignment in the exchange internal currency, The third step from allocating to the internal currency of the exchange after the call, A fourth step of releasing the related resources and ending the call if the incoming mobile subscriber first recovers during the call; And a fifth step of releasing the related resource and ending the call when the originating mobile subscriber recovers first during the call. The method of claim 1, wherein the first process is When a mobile subscriber attempts to make an outgoing call to his / her own country and receives a request for allowing UE to be set up at the UPIo in the mobile switching center via the BSCo, it notifies the VLR via the MPC and the VLR prevents the incoming call from being attempted by the subscriber. Indicating that the call is in progress, performing authentication, encryption, and user temporary number assignment procedures, and notifying BSCo of information for determining the terminal setting permission; When UPCo receives call setup request from BSCo, requests HLR to allow call setup of calling subscriber, and then receives call setup allowance information of calling subscriber from HLR, abnormal processing is performed when calling is not allowed. Notifying the call progress to inform BSCo that the call should continue if the subscriber is allowed to originate; The UPCo assigning the access link and the virtual path and the virtual channel on the link during the exchange period with the BSCo, requesting the access link establishment with the BSCo, and receiving a response thereto; UPCo analyzes the network identification number and performs other network incoming call processing when the incoming call is received from another network, and when the call is received by a mobile subscriber belonging to the mobile communication switching network, UPCo requests HLR routing information indicating to which exchange the called subscriber is located. Steps, UPCo receives routing information including mobile subscriber roaming number from HLR, analyzes it, recognizes incoming call to mobile subscriber of its own country, and if it is not a domestic call, handles incoming call to other station in its mobile communication network. Local call control method in a mobile communication switch, characterized in that comprising the step of performing. The method of claim 1, wherein the second process When UPCo requests the incoming routing requesting the VLR to verify the location of the called party, the VLR requests the called party page to the BSCt if it is not subject to a call constraint, is notified of the response, and confirms the response. Notifying the BSCt; Thereafter, after authentication, encryption, and user temporary number assignment procedures are performed between the terminal and the network, UPCo is notified of the termination of incoming routing from the VLR, To establish a call path inside the exchange, the UPCo examines a link that can satisfy the call requested by the user among the links connected to the central ATM switch connected to it, reserves the available candidate ATM switch links, and sets up the incoming call. Notifying the UPCt via a request message; Among the candidate ATM switch links received with UPCt, the physical address of the ATM switch, which is an optimal information transfer path, is selected in consideration of the link state accommodated in the destination switch module, and the virtual path and the virtual channel on the destination link are allocated. Notifying UPCo of this physical address information, virtual path and virtual channel information; The method according to claim 1, wherein the UPCo comprises releasing the link reservation for the rest of the candidate ATM switch links except the selected one. The method of claim 1, wherein the third process is After performing the second process, the UPCt requests the incoming call to the HLR to query the call restriction condition of the called user, and upon receiving the response, the UPCt receives abnormal response in the case of the call restriction condition through the result value in this message. Otherwise, requesting incoming call setup with BSCt; The UPCt assigning a virtual path and a virtual channel on the link and the access link during the switching period with the BSCt, requesting the access link establishment with the BSCt, and receiving a response thereto; Transmitting a 'report request' from the BSCt to the destination terminal via the UPCt and the UPCo to the BSCo, indicating that the ring is ringing; Thereafter, the destination UPCt updates the destination cell header conversion table using the physical address information, the virtual path, and the virtual channel of the source switch, and the source UPCo updates the physical address information, the virtual path, and the virtual channel of the destination switch. Updating a calling cell header conversion table by using the method to secure a call path between the calling subscriber and the called subscriber; Receiving a call setup notification from the BSCt in response to the called subscriber, passing the UPCt and the UPCo to the BSCo, and transmitting the response to the BSCt by the UPCt; After the call, the calling user information cell having the virtual path and the virtual channel is added to the control head and the physical address information of the switch by the cell header conversion table, and the virtual path and the virtual channel information are added to the new virtual path and the virtual channel. It is transformed into an internal cell structure that is changed to the form of a self-routing switch is transmitted to the called subscriber, and the user information cell of the called subscriber is also transmitted to the calling subscriber by a corresponding procedure to provide a two-way call is made Local call control method in a mobile communication switch, characterized in that. The method of claim 1, wherein the fourth process If the incoming mobile subscriber disconnects the call first while the call is established and the service is in progress, the UPCt receives the release request signal from the BSCt to request the release of the calling party to UPCo, and the virtual path as part of the resource release of the switching party. And de-allocating the virtual channel, requesting to release the destination cell head conversion table value to the matching module, releasing the ATM switch link, and deallocating the UNI resources, and notifying the BSCt that the terminating party's resources have been released. The UPCt requesting the disconnection of the called user call with the HLR and receiving a response thereto; The UPCt requests the BSCt to release an access link established outside the exchange, and receives a response from the BSCt; Requesting, by the BSCt, a VRL request to the VLR through the exchange to release the association between the terminal and the network, releasing the association related information set by the VLR, and notifying the BSCt of the response to the UE release request; The UPCo receiving the originating release request by the procedure of the above step sends the virtual path, the virtual channel de-allocation, the requesting cell to the sender cell head conversion table value release to the matching module, and releases the ATM switch link as part of the resource release of the exchange originating side. Performing a UNI resource deallocation procedure in turn, requesting the BSCt to release the calling party, The UPCo receives a response from the BSCo, requests the HLR to disconnect the originating user call, and receives a response from the HLR; The UPCo requesting the BSCo to release the access link established outside the exchange, and receiving a response from the BSCo; BSCo requesting the VLR to the VLR through the exchange to release the association between the terminal and the network, the VLR releases the association-related information established and notifies the BSCo of the response to the terminal decoupling request; Local call control method in a mobile communication switch, characterized in that made. The method of claim 1, wherein the fifth process If the calling mobile subscriber disconnects the call first while the call is established and the service is in progress, UPCo receives the release request signal from the BSCo and requests the caller to release to UPCt, and the virtual path as part of the resource release of the exchange originating party. And decommissioning the virtual channel, requesting the cell-head conversion table value of the called party to the matching module, releasing the ATM switch link, and deallocating the UNI resources, and informing the BSCo that the resource of the exchange is released. The UPCo requesting the disconnection of the called user call with the HLR and receiving a response thereto; The UPCo requesting the BSCo to release the access link established outside the exchange, and receiving a response from the BSCo; BSCo requesting the VLR to the VLR through the exchange to release the association between the terminal and the network, the VCo releases the association-related information established by the VLR and notifies the BSCo of the response to the UE decoupling request; The UPCt receiving the called party release request by the procedure of the above step releases the virtual path and virtual channel allocation as part of the resource release of the exchange called party, requests to release the matching cell head conversion table to the matching module, releases the ATM switch link, Performing UNI resource deallocation procedure in turn, requesting the called party to release the BSCt; The UPCt receives a response from the BSCt, requests the HLR to disconnect the originating user call, and receives a response from the HLR; The UPCt requests the BSCt to release an access link established outside the exchange, and receives a response from the BSCt; Requesting, by the BSCt, the VLR to the VLR through the exchange to release the association between the UE and the network, the VLR releases the association-related information established and notifies the BSCt of the response to the UE disassociation request; Local call control method in a mobile communication switch, characterized in that made.