KR100561685B1 - Method for Management of Handover Only Trunk Line Between Mobile Switching Center for Handover Using Interworking Interoperability Function in Mixed Mobile Communication System of Asynchronous Network and Synchronous Network - Google Patents

Abstract

The present invention proposes a management method that supports the maintenance and repair of a handover dedicated relay line for a handover through an interoperation unit in a mobile communication system in which asynchronous and synchronous networks are mixed.

The present invention transmits and receives relay line management messages, such as line restart messages, line break messages, line break release messages, and trunk line test messages, via an interoperation operator between the asynchronous exchange and the synchronous switch, while the asynchronous exchange and the interoperation operator operate in the ISUP protocol. The relay line management message is transmitted and received, and the synchronization exchanger and the interoperation operating unit confirm the relay line state by transmitting and receiving the relay line management message by the MAP protocol.

According to the present invention, the message transmission between the asynchronous exchange and the synchronous exchange can be made accurately, and the service of the mobile communication terminal can be provided with improved quality without disconnection.

Asynchronous Network, Synchronous Network, Handover, IIF, ISUP, Relay Line

Description

Method for management of handover only trunk line between mobile switching center for handover using interworking interoperability function in mixed in a mobile communication system with asynchronous and synchronous networks Mobile Communication System of Asynchronous Network and Synchronous Network}

1 is a configuration diagram of a mobile communication network to which the present invention is applied;

2 is a flowchart for explaining an example of a handover method between an asynchronous network and a synchronous network;

3A and 3B are diagrams for explaining a line restart message in a relay line management method according to the present invention;

4 and 5 are views for explaining a circuit cut-off and block release message of a relay line management method according to the present invention;

6A to 6C are diagrams for describing a relay line state test message in the relay line management method according to the present invention.

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

10: DBDM mobile communication terminal 20: asynchronous mobile communication system

30: synchronous mobile communication system 40: No.7 common signal network

50: dual stack home position register 60: interlocking operation unit

70: IP network 210: Node B / wireless network controller

220: asynchronous exchange 230: SGSN

240: GPRS network 250: GGSN

310: base station / base station controller 320: switchboard

330: packet data service node 340: data core network

The present invention relates to a method for managing a switching center relay line in a mobile communication system, and more particularly, to support maintenance / repair of a switching period relay line for handover through an interoperation operation unit in a mobile communication system in which asynchronous and synchronous networks are mixed. It relates to a management method.

Currently, the mobile communication network has a form in which a synchronous mobile communication system (CDMA mobile communication system) called 2nd generation or 2.5 generation network and asynchronous mobile communication system (WCDMA mobile communication system) called 3rd generation network coexist. Dual band dual mode terminals (DBDM mobile communication terminals) that can be used in the network has been developed.

The asynchronous mobile communication system is in the early stage of service, and because a huge investment cost is required to implement the system, it cannot be serviced in a large area, and thus, the asynchronous mobile communication system is superimposed on the synchronous mobile communication system. Accordingly, since the service area of the asynchronous mobile communication system is limited, a hand for providing a continuous service when the subscriber of the asynchronous mobile communication system moves to a synchronous area where the asynchronous mobile communication service is not provided while using the service in the asynchronous area. Over is needed.

In order to smoothly handover between an asynchronous mobile communication system and a synchronous mobile communication system, an interlocking operation unit is implemented between an asynchronous exchange and a synchronous exchange, and a method of performing a handover procedure by performing a message exchange using the same has been recently studied. When using the interoperation manager, the message exchange between the asynchronous exchange and the interoperation manager is performed by the ISUP protocol, and the message exchange between the interoperation manager and the synchronous exchange is performed by the MAP protocol.

As such, handover between the asynchronous mobile communication system and the synchronous mobile communication system is enabled by the exchange of messages through the handover transmission relay line between the asynchronous exchange, the interoperable operating unit, and the synchronous exchange. However, if the relay line of the asynchronous exchange, the interoperation operation unit, and the synchronous exchange period does not operate properly, an error occurs during the handover process, and thus the service for the mobile communication terminal moving from the asynchronous region to the synchronous region is disconnected. There is a problem.

The present invention has been made to solve the above-described problem, by periodically checking the state of the handover dedicated relay line between the asynchronous exchange and the synchronous exchange, providing a relay line management method that can prevent an error occurs when performing the handover There are technical challenges.

According to the present invention for achieving the above technical problem, in a mobile communication system in which an asynchronous mobile communication system and a synchronous mobile communication system are mixed, an asynchronous exchange and a synchronous exchange are connected by an interlocking operation unit, and the asynchronous mobile communication system and A relay line management method between an asynchronous exchange and a synchronous exchange for handover of a dual band dual mode mobile communication terminal capable of communicating with a synchronous mobile communication system, the line restart message and a line interruption between the asynchronous exchange and the synchronous exchange via the interoperation operation unit. Send and receive any one of the relay line management message of the message and the trunk line test message, wherein the asynchronous exchange and the interoperation operation unit transmits and receives the relay line management message by the ISUP protocol, the synchronization switch and the interoperation operation unit to the MAP protocol By checking the relay line status by transmitting and receiving the relay line management message.

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

1 is a block diagram of a mobile communication network to which the present invention is applied.

The mobile communication terminal 10 applied to the present invention is a dual band dual mode (hereinafter referred to as 'DBDM') mobile communication terminal, and is a type capable of simultaneously providing an asynchronous mobile communication service and a synchronous mobile communication service. It comprises a synchronous modem unit which is a module for, asynchronous modem unit which is a module for asynchronous mobile communication service and a common module, wirelessly connected to the asynchronous mobile communication system 20 and the synchronous mobile communication system 30, respectively, And data services.

The asynchronous mobile communication system 20 is a wireless network controller (Node B / RNC, 210) for controlling Node B and Node B as a base station for wireless section communication with the mobile communication terminal 10, wireless network controller 210 Is connected between the asynchronous exchange (MSC, 220), the radio network controller (RNC) and the GPRS (General Packet Radio Service) network 240 to perform a call exchange for providing a service to the mobile communication terminal (10) It is connected through a Serving GPRS Support Node (SGSN) 230, a SGSN 230, and a General Packet Radio Service (GPRS) network 240 that maintains a location track of the mobile communication terminal 10 and performs access control and security functions. And a Gateway GPRS Support Node (GGSN) 250 connected to the IP network 70 to support interworking with external packets.

In addition, the synchronous mobile communication system 30 is connected to the mobile communication terminal 10 and the base station controller (BTS / BSC, 310) for controlling the base station and the base station for supporting the wireless section communication, and connected to one or more base station controller to perform a call exchange A packet data service node (PDSN, 330), a packet data service node (330), and an IP network (70), which are connected to an exchange (MSC) 320, a base station controller (BSC), to provide a packet data service to a subscriber. It is configured to include a data core network (DCN, 340) to support the connection between.

In addition, the switch 220 and 320 of the asynchronous mobile communication system 20 and the synchronous mobile communication system 30 are interconnected by an interworking interoperability function (IFF) 60, and the interoperable operating unit ( 60 converts an asynchronous message transmitted from the asynchronous exchange 220 into a synchronous message and transmits the asynchronous message to the synchronous exchange 320, and constructs and manages the synchronous mobile communication system information as a database.

The asynchronous exchanger 220 and the synchronous exchange 320 are also interconnected to the No. 7 common signal network 40 and thereby connected to the dual stack home position register (D-HLR) 50, and the dual stack home position. The register 50 stores and manages asynchronous mobile communication system subscription information of the DBDM mobile communication terminal 10 and corresponding synchronous mobile communication system subscription information, and the asynchronous and synchronous exchanges 220 and 320 provide services such as handover. It can be referred to when executing.

In such a network configuration, the mobile communication terminal 10, which is located in the asynchronous mobile communication system 20 and uses a voice call, periodically checks the signal strength of the currently connected NodeB and the signal strength of the neighboring base station. If the signal is measured and reported to NodeB, and the signal strength with NodeB falls below a specified threshold, NodeB reports that a handover event has occurred to RX 220 via RNC. In this case, the Node B / RNC 210 transmits the neighbor cell information, the base station ID, etc. detected by the mobile communication terminal 10 to the asynchronous switch 220.

When the asynchronous switch 220 receives the handover request message from the RNC, the synchronous mobile communication system 30 determines whether it is a handover between adjacent cells in the asynchronous mobile communication system 20 with reference to neighbor cell information, base station ID, and the like received from the RNC. It is determined whether or not the handover is performed.

In the case of handover between adjacent cells in the asynchronous mobile communication system 20, the asynchronous exchange 220 performs handover to the adjacent cell, and in the case of handover to the synchronous mobile communication system 30, through the IIF 60. Handover is made to the synchronous exchange 320. To this end, the IIF 60 converts an asynchronous message into a synchronous message and transmits it to the synchronous exchange 320, and the synchronous mobile communication system information must be previously built and managed in a database. The database contains exchange information, signaling points, and trunk line information for the dedicated channel. The IIF 60 selects the handover target exchange 320 according to the handover request from the asynchronous exchange 220 and the synchronous mobile communication system information, and generates a billing ID including a handover target exchange ID and the like. It is used in the subsequent handover process.

This handover procedure will be described in more detail with reference to FIG. 2 as follows.

2 is a flowchart illustrating an example of a handover method between an asynchronous network and a synchronous network.

As the mobile communication terminal 10 using the voice call in the asynchronous mobile communication system 20 moves to the synchronous mobile communication system 30, the mobile communication terminal 10 is moved from the synchronous mobile communication system 30. Signal is detected from the Node B of the asynchronous mobile communication system 20 and the signal strength with the neighboring base station (or Node B) periodically measured and reported to the Node B. Accordingly, when the Node B currently connected to the mobile communication terminal 10 confirms that the signal strength between the mobile communication terminal and the Node B is less than or equal to a specified value, the handover is requested to the asynchronous exchanger 220 through the RNC (IU Reloc). Required) (S101).

This handover request message (IU Reloc Required) includes a handover related message used in a synchronous mobile communication system. In addition, the RNC transmits neighbor base station information (base station ID), neighbor cell information, etc. received from the mobile communication terminal 10 together, and the asynchronous switch 220 according to the information indicates whether handover between neighbor cells in the asynchronous mobile communication system. Or, it is determined whether the handover is made to the synchronous mobile communication system 30. The handover request message (IU Reloc Required) that the RNC sends to the asynchronous switch 220 includes the message type, handover type, handover cause, source base station controller ID, target base station controller ID, radio access bearer (RAB) information, and radio. It includes parameters such as section related information. In addition, the RNC additionally includes handover related information used in the synchronous mobile communication system in an Old BSS To New BSS Information parameter included in the handover request message.

Upon receiving the handover request message, the asynchronous exchange 220 transmits an asynchronous message requesting a handover to the interoperation operation unit 60 (MAP Prep Handover Req) (S102). In this case, the expansion container is added to the asynchronous message to transmit the asynchronous identification number (MSISDN) of the mobile communication terminal 10, and the message includes parameters such as an invoke ID, a target cell ID, a target radio network controller ID, and an MSISDN. It includes.

Subsequently, the interoperation operation unit 60 refers to the asynchronous subscriber information (MSISDN) received from the asynchronous exchange 220, and requests to transmit subscriber information to the dual stack home location register 50 (Call Data Request). (S103). That is, to request the synchronization network identifier (MIN, ESN) of the mobile communication terminal 10. In operation S103, the interoperation operation unit 60 may request the subscriber's synchronization network identifier information using the asynchronous message MAP_SEND_IMSI to the dual stack home location register 50.

The dual stack home location register 50 receiving the subscriber information request from the interlocking operation unit 60 searches the database, extracts the subscriber's synchronization network identifier information (MIN, ESN), and transmits the information to the interoperation operation unit 60. (Call Data Req Ack) (S104). Here, the call data request for the subscriber's sync network identifier information includes a parameter such as a billing ID, a digit (ie, MSISDN), and the response message (Call Data Req Ack) is an ESN, MIN. , Parameters such as MSCID. On the other hand, when using the asynchronous message (MAP_SEND_IMSI) when requesting the subscriber's synchronization network identifier information, the parameters included in this message include the Invoke ID, MSISDN, IMSI, ESN.

Receiving the subscriber information from the dual stack home location register 50, the interlocking operation unit 60 instructs the handover to the synchronization switch 320 (Facilities Directive2) (S105), the synchronization switch 320 is the base station controller Request handover to the base station 310 (Handoff Request) (S106).

As described above, the interlocking operation unit 60 generates a billing ID and includes the billing ID in the handover instructions message (Facilities Directive2) before transmitting the handover instructions message (Facilities Directive2) to the synchronization exchanger 320. The switch includes an internal exchange circuit ID (InterMSCCircuitID) for each handover section. Here, the billing ID includes ID information of the synchronous exchange 320 to be connected to the asynchronous trainer 220.

The base station / base station controller 310 receiving the handover request from the switch 320 transmits a null frame to the synchronous modem unit of the mobile communication terminal through the forward traffic channel. The base station / base station controller 310 transmits a response message (Handoff Request Ack) to the switch 320 (S108). In addition, the exchange 320 transmits a response message (Facilities Directive2 Ack) to the handover instruction to the interoperation operation unit 60 (S109), and the interoperation operation unit 60 transmits the step S102 to the asynchronous exchange unit 220. In step S110, a response message (MAP Prep Handover Resp) for a handover request is transmitted. Accordingly, the relay line between the asynchronous exchange 220 and the synchronous exchange 320 is set.

In more detail, the interoperation operation unit 60 sets a mapping relationship between a dedicated channel, which is a logical trunk line setting identifier, and a physical trunk line, and sets this information to an internal exchange circuit of a handover request message (Facilities Directive2). It is set to ID (InterMSCCircuitID) and transmitted to the synchronous exchange 320. When a response message (Facilities Directive2 Ack) is transmitted from the synchronous exchange 320, a relay line is established between the asynchronous exchange 220 and the synchronous exchange 320. . The handover request message (Facilities Directive2) transmitted / received between the interoperation operation unit 60 and the synchronization exchanger 320 includes parameters such as billing ID, ESN, internal exchange circuit ID, MIN, and the like, and the response message (Facilities Directive2 Ack). ) Includes parameters such as CDMA channel data, CDMA channel list, and the like.

Subsequently, the asynchronous exchange 220 transmits an initial address message (IAM), which is an initial address message, to the interoperation operation unit 60, and the interoperation operation unit 60 transmits an address completion message (ACM) as a response thereto. By doing so, the trunk setup is made between the asynchronous exchange 220 and the synchronous exchange 320, whereby the call is routed (S111, S112). The exchange duration message for trunk establishment is sent and received by the ISUP.

As such, after the switching period relay line and trunk are established, the asynchronous exchange 220 reports that the resource allocation for handover is completed to the Node B / RNC 210 (IU Relocation Command) (S113), and the node receiving the same. The B / RNC 210 requests to perform handover to the asynchronous modem unit of the mobile communication terminal 10 (Handover from UTRAN Command) (S114). Here, the message (IU Relocation Command) reporting that resource allocation is completed includes parameters such as message type, RRC container, RAB list to release, and the like.

Subsequently, the asynchronous modem unit of the mobile communication terminal transmits channel assignment information to the synchronous modem unit (Channel Assignment) (S115), and the interoperation operation unit 60 requests an access signal to the asynchronous exchanger 220 (MAP Process Access Signaling). Req) (S116), the access signal includes an invoke ID, an application protocol data unit (APDU), selected radio resource information and the like.

In addition, the synchronous modem unit of the mobile communication terminal transmits a frame or preamble through the reverse traffic channel to the base station / base station controller 310 of the synchronous mobile communication system (Reverse Traffic Channel Frames or Traffic Channel Preamble) (S117), handover The base station / base station controller 310 receives the response signal (BS Ack Order) (S119). Then, the synchronous modem unit notifies the asynchronous modem unit that the connection with the synchronous mobile communication system is completed (Call Connection) (S120).

Subsequently, the base station / base station controller 310 reports that the handover is completed to the switch 320 (Handoff Complete) (S121), and the switch 320 notifies the interoperation operation unit 60 that the handover is completed. (Mobile On Channel) (S122), the interlocking operation unit 60 receives the request to release the connection to the asynchronous exchange 220 (MAP Send End Signal Req) (S123).

In addition, the interoperation operation unit 60 transmits a message indicating that the synchronous switch 320 and the mobile communication terminal are connected to the asynchronous switch 220 (ANSWER) (S124), the asynchronous switch 220 and the node B / RNC The connection is released (IU Release Command, IU Release Complete) (S125, S126).

After the handover from the asynchronous mobile communication system to the synchronous mobile communication system for the voice call is completed by the above-described procedure, the call release process will be described. The call release may be requested first from the subscriber's mobile communication terminal in the asynchronous mobile communication system area or first from the subscriber's mobile communication terminal handed over to the synchronous mobile communication system area. A case in which a subscriber's mobile communication terminal requests call release is described.

As the mobile communication terminal releases the call, the call between the asynchronous exchange 220 and the synchronous exchange 320 is released (Call Release) (S127), and the trunk connection between the exchanges is released (Release) (S128). Thereafter, the asynchronous exchange 220 reports that the disconnection is completed to the interlocking operation unit 60 (MAP Send End Signal Resp) (S129), the interlocking operation unit 60 is called to the synchronous exchange (320). The release request message (Facilities Release) is transmitted (S130), and as the synchronous exchange 320 receiving the message responds thereto (Facilities Ack), the relay line set up in the exchange period is released (S131). Here, the call release request message (Facilities Release) includes parameters such as internal MSC circuit ID, release reason, billing ID, MIN, etc., and the response message (Facilities Ack) includes parameters such as billing ID.

This handover procedure is possible when the message between the asynchronous exchange and the synchronous exchange is correctly transmitted and received without error. That is, the asynchronous exchange and the synchronous exchange are connected by the handover interoperation unit and the transmission relay line, and the relay line can be provided with high quality service only when the relay line is properly operated.

To this end, the asynchronous exchange and the synchronous exchange use a circuit restart message, a circuit disconnection message, a circuit disconnection release message, a relay line test message, a relay line test release message, etc. in order to confirm that a handover dedicated relay line operates correctly. In the present invention, such a message will be referred to as a relay line management message, and in a state in which an asynchronous exchange or a synchronous exchange responds to a call of a counterpart exchange, an asynchronous exchange or a synchronous exchange transmits a relay line management message to a counterpart exchange through an interoperation unit. The state of the relay line can be confirmed by receiving the response.

In other words, the relay line management message may first transmit a management message from either side of the asynchronous and synchronous exchanges when the exchange is in the invoked state, and the exchange receiving the management message transmits a response thereto, thereby sending the management message. To check the relay line status.

If the asynchronous exchange transmits the relay management message, if the asynchronous exchange transmits the relay management message through the ISUP protocol to the interoperation operator, the interoperation operator converts it to the relay management message through the MAP protocol and transmits it to the synchronization exchange. do. On the contrary, when the synchronous exchange transmits the relay line management message through the MAP protocol to the interlocking operator, the interlocking operator converts the relay line management message through the ISUP protocol to the asynchronous exchange.

3 to 6 are diagrams for explaining a method of checking a state of a handover dedicated relay line between exchanges by transmitting and receiving relay line management messages and a list of parameters included in each relay line management message. By using the protocol, the relay management message is transmitted to the Interoperation Management Unit (IIF), and the Interoperation Management Unit converts it to the MAP protocol and transmits the relay line management message to the synchronous exchange. An example of a case in which a response message is transmitted to the asynchronous exchange unit, and the interoperation manager converts it to the ISUP protocol and transmits the response message to the asynchronous exchange will be described.

3A and 3B are diagrams for explaining a circuit restart message in a relay line management method according to the present invention. As shown in FIG. 3A, an asynchronous exchange needs to use a relay line with a synchronous switch or is lost. In order to regenerate information about the circuit state and restart the circuit, a circuit restart message (RSC) is transmitted to the interoperation unit using the ISUP protocol. The interoperation manager then converts it to MAP protocol and sends a circuit restart message (ResetCircuit) to the synchronous exchange.

Receiving a circuit reset message (ResetCircuit) by the MAP protocol from the interoperation unit, the synchronous exchange transmits a response message (ResetCircuit Ack) including relay line status information to the interoperation unit, which is based on the ISUP protocol. It is converted into a message (RLC) and sent to the asynchronous exchange as a response message to the ISUP circuit restart message (RSC).

The MAP based circuit restart message includes an internal exchange circuit ID (InterMSCCircuitID) as shown in FIG. 3B, and the response message includes a trunk line state (TrunkState).

4 and 5 are diagrams for explaining a circuit cut-off and block release message in a relay line management method according to the present invention.

First, referring to FIG. 4A, the asynchronous exchange indicates that a relay line allocated between the synchronous exchanges has been blocked from service, i.e., when the connection is no longer needed to maintain a connection during the exchange period, a circuit break message (BLO) by the ISUP protocol is transmitted to the interoperation operation unit. ), And the interoperation manager transmits a message (blocking) converted to the MAP protocol to the synchronous exchange.

Accordingly, the synchronization exchange transmits a blocking message for the rotation blocking message to the interoperation unit by the MAP protocol, and the interoperation unit converts it into a response message (BLA) for the ISUP line blocking message (BLO). Send it to the asynchronous exchange.

Referring to FIG. 5A, when the connection to the synchronous exchange is interrupted by the circuit disconnect message described in FIG. 4A, the asynchronous exchange uses a circuit reset message (UBL) using the ISUP protocol as an interoperation operation unit to switch the relay line back to a service state. ), And the interoperation manager converts it to a MAP message (Unblocking) and sends it to the synchronous exchange.

The synchronous exchange receiving the circuit reset message (Unblocking) sends a MAP message (Unblocking Ack) to the interoperation unit in response to the interworking operation unit, which converts it into an ISUP message (UBA) and transmits it to the asynchronous exchange.

The parameters included in the MAP protocol based circuit blocking message (Blocking) include an internal exchange circuit ID (InterMSCCircuitID) as shown in FIG. 4B, and the parameters included in the MAP protocol based circuit reset message (Unblocking) are also shown in FIG. 5B. As such, it contains the internal exchange circuit ID (InterMSCCircuitID).

Next, FIGS. 6A to 6C are diagrams for describing a relay line test message among relay line management methods according to the present invention.

As shown in FIG. 6A, the asynchronous exchange transmits the trunk line test message (CCR) to the interoperation unit using the ISUP protocol to verify that the relay line operates correctly, and the interoperation unit converts it into a MAP message (TrunkTest). To the synchronous exchange. Accordingly, the synchronous exchange transmits a response message (TrunkTest Ack) to the interworking operation unit for the trunk line test message.

In addition, when the relay line test is to be terminated, the asynchronous exchange transmits a relay line test release message (REL), which is an ISUP message, to the interoperation operation unit, and the interoperation operation unit converts it to a MAP message (TrunkTestDisconnect) and transmits the same to the synchronous exchange.

The synchronous exchange that receives the trunk line test disconnect message (TrunkTestDisconnect) transmits a response message (TrunkTestDisconnect Ack) to the interoperation unit, and the interoperation unit converts it to an ISUP message (RLC) and transmits it to the asynchronous exchange.

The MAP protocol based trunk line test message (TrunkTest) includes an internal exchange circuit ID (InterMSCCircuitID) and a scissor type (SeizureType) as shown in 6b, and the MAP protocol based relay line test disconnect message (TrunkTestDisconnect) is shown in FIG. 6C. As well as the internal exchange circuit ID (InterMSCCircuitID).

In the above description, a case in which the relay line management message is transmitted from the asynchronous exchange to the synchronous exchange through the interoperable operating unit has been described. However, the relay switch transmits the relay line management message to the asynchronous exchange through the interoperable operating unit and receives a response message. It is also possible to manage the relay line status in a way. In addition, the parameters included in each relay management message may be added according to the extension of the exchange period function in addition to the items shown in the drawings.

The present invention described above, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

As described above, according to the present invention, when the asynchronous mobile communication system overlaps the synchronous mobile communication system and the dual band dual mode mobile communication terminal moves from the asynchronous mobile communication system area to the synchronous mobile communication system area, the handover procedure is performed. In order to perform correctly, the relay line management message is transmitted and received between the asynchronous exchange and the synchronous exchange to establish, reset, release, retry, and check the relay line, thereby enabling the message transmission between the asynchronous exchange and the synchronous exchange to be accurately performed. Accordingly, it is possible to provide an improved quality of service without interrupting service to the mobile communication terminal.

Claims (7)

In the mobile communication system in which the asynchronous mobile communication system and the synchronous mobile communication system are mixed, the asynchronous exchange and the synchronous exchange are connected by an interlocking operation unit, and the dual band dual mode capable of communicating with the asynchronous mobile communication system and the synchronous mobile communication system. A method for managing relay lines between an asynchronous exchange and a synchronous exchange for handover of a mobile communication terminal, Sending and receiving a relay management message of any one of a line restart message, a circuit break message and a relay line test message between the asynchronous exchange and the synchronous exchange via the interoperation operation unit, The asynchronous exchange and the interoperation operation unit transmits and receives the relay line management message by the ISUP protocol, and the synchronous exchange and the interworking operation unit confirms the relay line state by transmitting and receiving the relay line management message by the MAP protocol. How to manage your trunk. The method of claim 1, The relay line management message further includes a line block release message. And reactivating the relay line by the circuit disconnection release message when the circuit disconnection message is transmitted / received between the asynchronous exchange and the synchronous exchange via the interoperation operation unit. The method of claim 1, The relay line management message further includes a relay line test release message. And repeating the test by the relay line test release message when the relay line test message is transmitted and received between the asynchronous exchange and the synchronous exchange via the interoperation operation unit. The method of claim 1, The relay line management message may be transmitted by the asynchronous exchange to the synchronous exchange through the interoperation manager and receive the response, or the synchronous exchange is transmitted to the asynchronous exchange through the interoperation manager and receive the response. Relay line management method characterized in that the transmission and reception by. The method of claim 1, The circuit restart message includes an internal exchange circuit ID (InterMSCCircuitID), and the response message includes a trunk line state (TrunkState). The method of claim 1, The circuit break message includes an internal exchange circuit ID (InterMSCCircuitID). The method of claim 1, The relay line test message may include an internal exchange circuit ID (InterMSCCircuitID) and a scissor type (SeizureType).

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