KR100204596B1

KR100204596B1 - Hand-over control method

Info

Publication number: KR100204596B1
Application number: KR1019960063182A
Authority: KR
Inventors: 박현화; 정동수; 김대식
Original assignee: 곽치영; 주식회사데이콤; 정선종; 한국전자통신연구원
Priority date: 1996-12-09
Filing date: 1996-12-09
Publication date: 1999-06-15
Also published as: KR19980045025A

Abstract

본 발명은 지능형 이동통신 시스템에서 핸드오버 제어 방법에 관한 것으로, 이동단말과 기지국에서 이동단말의 이동이나 유무선 환경의 변경을 검출하여 핸드오버를 시작하고, 기지국과 교환기에서 새로운 유무선 자원의 점유 및 새로운 유뮤선 채널로 전환하며, 핸드오버가 성공적으로 수행된 이후에 이전의 유무선 자원을 복구하므로써 이동 가입자가 통화중에 이동을 하더라도 통화를 단절없이 호를 계속 유지할 수 있는 핸드오버 제어 방법에 제시된다.The present invention relates to a handover control method in an intelligent mobile communication system, wherein the mobile station and the base station detect the movement of the mobile station or the change of the wired / wireless environment to start the handover, and the new base station and the exchange occupy new wired and wireless resources. The present invention proposes a handover control method for switching to a wired / wireless channel and restoring a call without disconnection even if a mobile subscriber moves during a call by restoring previous wired / wireless resources after the handover is successfully performed.

Description

Handover Control Method

본 발명은 지능형 이동통신 시스템에서 통화중인 이동 단말이 이동하더라도 통화의 단절없이 통화를 계속하도록 하는데 필요한 핸드오버 제어 방법에 관한 것이다.The present invention relates to a handover control method required to continue a call without disconnection even if the mobile terminal in a call moves in an intelligent mobile communication system.

지능형 이동통신 망에서는 셀 반경이 다양해지고, 다층 셀 구조로 인해 셀간, 기지국간, 교환기간, 망간 핸드오버 등 그 수준에 따라 다양해지고, 또한 빈번하게 발생하게 되므로 핸드오버 처리 절차는 복잡해지고 실시간 처리 및 통화 품질의 보장이 요구된다. 이로 인해 지능형 이동통신 망에서는 핸드오버 처리를 위해 망 요소간의 정보 흐름을 최소화 해야 하며 교환기의 핸드오버 부담을 줄이고, 상대 가입자의 통화로에 영향을 미쳐서는 안된다.In an intelligent mobile communication network, the cell radius is diversified, and due to the multi-layered cell structure, the cellover, base stations, exchange periods, and inter-network handovers vary according to their levels and occur frequently. And guarantee of call quality is required. For this reason, the intelligent mobile communication network should minimize the information flow between network elements for handover processing, reduce the handover burden of the exchange, and not affect the call path of the other subscriber.

종래의 개인통신 시스템에서의 이동 단말에서 핸드오버할 대상 기지국을 직접 결정하여 해당 기지국으로 핸드오버를 요구한다. 그러므로 요구를 수신한 대상 교환기에서는 호를 설정한 교환기에 대한 정보가 전혀 없으므로 호를 발생하기 전의 최근 위치 정보가 저장되어 있는 단말 데이터 저장 장치를 조회하여 단말의 로딩 번호 또는 교환기 번호를 검색하여야 하는 단점이 있다.In a conventional personal communication system, a mobile station directly determines a target base station to be handed over to request a handover to the base station. Therefore, the target exchange receiving the request has no information on the exchange setting up the call, so it is necessary to query the terminal data storage device that stores the latest location information before the call is generated and search for the loading number or the exchange number of the terminal. There is this.

따라서 본 발명에서는 교환기의 부담을 줄이기 위해 핸드오버 제어는 기지국에서 수행하며, 교환기에서는 새로운 통화로 연결 및 복구를 수행하며, 또한 교환기간 핸드오버 수행시에 새로운 교환기는 통화로만 제공하고, 호를 처음 설정한 교환기에서 호를 제어하여 과금 처리 및 부가 서비스 수행을 용이하도록 하는데 그 목적이 있다.Therefore, in the present invention, in order to reduce the burden on the exchange, the handover control is performed at the base station, and the exchange performs connection and recovery with a new call, and during the exchange period handover, the new exchange provides only the call, and the first call is made. The purpose of the call is to control the call in the established exchange to facilitate billing processing and additional service.

상술한 목적을 달성하기 위한 본 발명은 이동단말과 기지국에서 이동단말의 이동이나 유무선 환경의 변경을 검출하여 핸드오버를 시작하는 단계와, 기지국과 교환기에서 새로운 유무선 자원의 점유 및 새로운 유무선 채널로 전환하는 단계와, 핸드오버가 성공적으로 수행된 이후에 이전의 유무선 자원을 복구하는 단계로 이루어진 것을 특징으로 한다.The present invention for achieving the above object is to initiate a handover by detecting the movement of the mobile terminal or a change in the wired and wireless environment in the mobile station and the base station, the base station and the switch to occupy new wired and wireless resources and to switch to a new wired and wireless channel And restoring the previous wired or wireless resource after the handover is successfully performed.

제1도는 본 발명이 적용되는 지능형 이동통신 시스템을 설명하기 위한 블록도.1 is a block diagram illustrating an intelligent mobile communication system to which the present invention is applied.

제2도는 핸드오버가 발생하는 경우를 설명하기 위한 망 구성도.2 is a network diagram illustrating a case where a handover occurs.

제3도는 본 발명에 따른 지능형 이동통신 시스템에서의 기지국간 핸드오버 제어 절차를 설명하기 위한 정보 흐름도.3 is an information flow chart for explaining a base station handover control procedure in an intelligent mobile communication system according to the present invention.

제4도는 본 발명에 따른 지능형 이동통신 시스템에서의 교환기간 핸드오버 제어 절차를 설명하기 위한 정보 흐름도.4 is an information flow chart for explaining a switching period handover control procedure in an intelligent mobile communication system according to the present invention.

제5도는 본 발명에 따른 지능형 이동통신 시스템에서의 연속적인 교환기간 핸드오버 제어 절차를 설명하기 위한 정보 흐름도.5 is an information flow chart for explaining a continuous switching period handover control procedure in an intelligent mobile communication system according to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

100 : 기지국 200 : 기지국100: base station 200: base station

310 : ATM 스위치 320 : 서비스 제어 장치310: ATM switch 320: service control unit

330 : 호 제어 장치 340 : 단말 정보 저장 장치330: call control device 340: terminal information storage device

350 : 망 접속 장치 360 : 운용 보전 장치350: network connection device 360: operation maintenance device

370 : 지능망 주변 장치 400 : 서비스 데이터 장치370: intelligent network peripheral device 400: service data device

본 발명은 지능형 이동통신 망에서 통화 중인 가입자의 이동으로 인해 발생하는 핸드오버를 효율적으로 제어하기 위한 방법으로서 이동단말과 기지국에서 이동단말의 이동이나 유무선 환경의 변경을 검출하여 핸드오버를 시작하는 핸드오버 검출 과정, 기지국과 교환기에서 새로운 유무선 자원의 점유 및 새로운 유무선 채널로 전환하는 핸드오버 수행 과정, 핸드오버가 성공적으로 수행된 이후에 이전의 유무선 자원을 복구하는 핸드오버 종료 과정을 수행한다.The present invention is a method for efficiently controlling a handover caused by the movement of a subscriber in a mobile communication network in an intelligent mobile communication network, and starts a handover by detecting a movement of a mobile terminal or a change in a wired or wireless environment at a mobile terminal and a base station. An over-detection process, a base station and a switch perform a handover process of occupying a new wired / wireless resource and switching to a new wired / wireless channel, and a handover termination process of restoring a previous wired / wireless resource after the handover is successfully performed.

또한, 본 발명에서는 핸드오버 처리시에 현재 서비스 중인 기지국에서 핸드오버를 제어하고, 교환기에서는 새로운 기지국으로의 스위치만 연결하도록 하여 핸드오버로 인한 신호 부담을 최소화하여 실시간 처리가 가능하게 하며, 교환기간 핸드오버 처리를 위해 필요한 정보 송수신은 교환기에서 수행하여 기지국간의 인터페이스가 없도록 하여 트랜잭션 관리를 용이하도록 한다. 교환기간 핸드오버 처리시에 호를 처음 설정한 교환기에서 처리하므로, 상대 가입자는 핸드오버의 영향을 받지 않도록 한다. 또한 연속적인 핸드오버 처리시에는 기점 교환기에서 호 및 핸드오보를 제어하는 경로 최적화 개념을 적용하여 핸드오버에 직접적인 관련이 없는 교환기를 제외시켜 자원의 낭비를 방지하고, 기타 과금 및 부가 서비스의 제어를 용이하도록 한다.In addition, in the present invention, the handover is controlled by the base station currently in service during handover processing, and the switchboard connects only a switch to a new base station, thereby minimizing the signal burden due to the handover, thereby enabling real-time processing. Information transmission and reception necessary for handover processing is performed at the exchange, so that there is no interface between base stations to facilitate transaction management. During the exchange period handover processing, the call is handled by the first established exchange so that the other subscriber is not affected by the handover. In the case of continuous handover processing, the path exchange concept that controls call and hand-over is applied at the base exchange to prevent the waste of resources by excluding the exchange that is not directly related to handover, and to control other billing and additional services. Make it easy.

이하, 첨부된 도면을 참조하여 본 발명을 상세히 설명하기로 한다.Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

제1도는 본 발명이 적용되는 지능형 이동통신 시스템 구조도로서, 이동단말(100) 유무선 인터페이스 기능을 수행하는 기지국(Base Station)(200), 호 제어, 핸드오버 등을 수행하는 이동통신 교환기(Mobile Switching Center, 이하 교환기라 함)(300)와 망 내에서 요구되는 서비스를 제공하기 위해 필요한 정보를 저장하고 다른 구성 요소의 요구에 따라 검색한 후 통보해 주는 서비스 데이터 장치(Service Data Information)(400)로 구성된다.FIG. 1 is a structural diagram of an intelligent mobile communication system to which the present invention is applied and includes a base station 200 that performs a wired / wireless interface function, a mobile control switch that performs call control, handover, and the like. Center (hereinafter referred to as an exchange) (300) and a service data device (Service Data Information) 400 for storing and retrieving the information required to provide a service required in the network and searching and notifying according to the requirements of other components It consists of.

이동단말(100)은 무선 채널 암호화/해독 및 품질 측정, 그리고 RF 전력 제어 등을 수행하는 이동 고주파 송수신(Mobile Radio Transmission and Reception; MRTR)(101), 유휴 상태에서 셀 선택 및 이동단말에 의한 핸드오버 시작, 초기 접속시동 등을 제어하는 이동 고주파 자원 제어(Mobile Radio Resource Control; MRRC)(102), 이동단말과 망간의 무선 베어러 연결 설정, 유지, 수정 및 해제 기능을 제어하는 베어러 제어 관리 기능(Bearer Control Agent Function : 이하 BCAF라 함)(103), 이동단말의 망 접근 제어 기능 및 단말 접속 기능(Terminal Access Control Function : 이하 TACF라 함)의 서비스 제공 능력을 통하여 연결 설정 및 해재 기능을 수행하고, TACF로부터 수신한 단말과 망간의 베어터 연결 정보를 이동 단말로 전달하는 단말 접촉 제어 관의 기능(Terminal Aecess Control Agent Function : 이하 TACF라 함)(104), 이동단말 측에서 망으로 사용자 접속을 제공하는 기능을 수행하는 호제어 관리 기능(Call Control Agent Function enganced; CCAF)(105), 이동단말 측에서 전반적인 서비스의 접근 제어 로직과 수행을 제공하는 이동 제어 기능(Mobile Control Function : 이하 MCF라 함)(106), 망이나 서비스 제공자에게 사용자를 확인하는 기능을 사용하는 사용자 식별 관리 기능(User Identification Management Funcion; UIMF)(107), 망이나 서비스 제공자에게 단말기를 확인하는 기능을 제공하는 단말 식별 관리 기능(Terminal Identification Management Function; TIMF)(108) 등으로 구성된다.The mobile terminal 100 is a mobile radio transmission and reception (MRTR) 101 that performs wireless channel encryption / decryption and quality measurement, RF power control, etc., cell selection in idle state, and a hand by the mobile terminal. Mobile Radio Resource Control (MRRC) 102 that controls over-start, initial access, etc., and bearer control management functions that control the establishment, maintenance, modification, and release of radio bearer connections between the mobile terminal and the network ( Connection establishment and release functions through the service providing capability of the bearer control agent function (hereinafter referred to as BCAF) 103, the mobile terminal network access control function and the terminal access function (terminal access control function: TACF); A terminal access control function (terminal access control agent function: TACF) 104 for transmitting bearer connection information between the terminal and the network received from the TACF to the mobile terminal; Call Control Agent Function (CCAF) 105, which performs a function of providing a user access from the mobile terminal side to a network, and a mobile control function providing access control logic and performance of the overall service on the mobile terminal side. (Mobile Control Function: hereinafter referred to as MCF) (106), User Identification Management Funcion (UIMF) using the function to identify the user to the network or service provider (107), the terminal to the network or service provider And a terminal identification management function (TIMF) 108 that provides a function to confirm.

기지국(200)은 무선 채널 암호화/해독 및 품질 측정, RF 전력 제어, 초기 접속 감지 및 처리 등을 제어하는 고주파 송수신(Radio Frequency Transmission and Reception; RFTR)(201), 무선 자원의 할당, 유지, 해제 및 핸드오버를 위한 자원 예약을 수행하고, 주변 셀을 포함하여 무선 채널 품질 측정을 기반으로 서비스 품질을 추정하여 핸드오버를 결정하고, RF(radio frequency) 전력 제어 및 시스템 정보 방송을 제어하는 고주파 자원 기능(Radio Resource Function; RRC)(202), 유선의 베어러 서비스에 반한 무선 베어러 서비스의 연결 기능을 제공하며, 이동단말과 망간의 무선 베어러와 베어러의 접속 설정, 유지 및 해제를 수행하는 무선 베어러 제어 기능(Bearer Control Function-무선 베어러 관련; 이하 BCFr이라 함)(203), 베어러 상호 연결을 제어하는 베어러 제어 기능(Bearer Control Function; 이하 BCF라 함)(204), 발신, 착신, 핸드오버 등의 호 제어를 위하여 이동단말과 망간의 베어러 연결을 설정, 해제하는 기능을 제공하는 TACF(205), 비호 관련 신호 처리 및 제어 기능으로 입호 등록, 단말 등록과 같은 서비스 인스턴트를 설정, 유지, 해제하는 기능을 제공하는 서비스 접속 제어 기능(Service Access Control Function; SACF)(206) 등으로 구성된다.The base station 200 is a radio frequency transmission and reception (RFTR) 201 for controlling radio channel encryption / decryption and quality measurement, RF power control, initial connection detection and processing, and allocation, maintenance, and release of radio resources. And a high frequency resource for performing resource reservation for handover, determining handover by estimating a service quality based on radio channel quality measurement including neighboring cells, and controlling radio frequency (RF) power control and system information broadcasting. Radio Resource Function (RRC) 202, which provides a connection function of a radio bearer service against a wired bearer service, and controls a radio bearer for establishing, maintaining, and releasing a connection between a mobile terminal and a network. Function (Bearer Control Function-related to wireless bearer; hereafter referred to as BCFr) 203, Bearer Control Function (BC) to control bearer interconnection 204), a TACF 205 that provides a function of establishing and releasing a bearer connection between a mobile station and a network for call control such as origination, incoming, handover, etc. And a service access control function (SACF) 206 that provides a function of setting, maintaining, and releasing service instants such as registration and terminal registration.

교환기(300)는 비동기 전송 모드(Asynchronous Transfer Mode; 이하 ATM이라 함) 스위치(310), 서비스 제어 장치(320)(Service Controller), 호 제어 장치(330)(Call Controller), 단말정보 저장 장치(340)(Terminal Information), 망 접속 장치(350), 운용 보전 장치(360), 지능망 주변 장치(370)으로 구성된다.The exchange 300 includes an asynchronous transfer mode (hereinafter, referred to as ATM) switch 310, a service controller 320 (Service Controller), a call controller 330 (Call Controller), a terminal information storage device ( 340 (Terminal Information), the network connection device 350, the operation maintenance device 360, the intelligent network peripheral device 370.

서비스 제어 장치(320)는 전반적인 서비스 및 이동성 제어 로직 포함 및 서비스 관련 동작을 처리하는 서비스 제어 기능(Service Control Function : 이하 SCF라 함)(321)으로 구성되며, 호 제어 장치(330)는 호 제어 기능(Call Control Function : 이하 CCF라 함)과 서비스 교환 기능(Service Switching Function : 이하 SSF라 함)간 상호 작용에 필요한 기능을 제공하는 SSF(331)와 망 내의 베어러 접속 설정, 유지 및 해제하고, 베어러 제어를 위해 동등 CCF와 협력하여, 지능망 서비스가 검출되면 SSF로 전달하는 CCF(332)로 구성된다.The service control device 320 includes a service control function (hereinafter referred to as SCF) 321 that includes overall service and mobility control logic and service related operations, and the call control device 330 is a call control device. Establishes, maintains and releases bearer connections in the network and SSF 331 providing functions necessary for interaction between a function (Call Control Function (hereinafter referred to as CCF)) and a service switching function (hereinafter referred to as SSF); In coordination with the equivalent CCF for bearer control, it consists of a CCF 332 that forwards to the SSF when an intelligent network service is detected.

제2도는 핸드오버가 발생하는 경우를 나타낸 망 구성도로서, 통화 중인 이동 단말은 주변 기지국의 파일롯 채널 신호 세기를 측정하여 일정치 이상으로 강해지면 핸드오버를 요구한다. 이동단말이 기지국 11에서 기지국 12 사이로 이동 시에 기지국에서는 교환기 10으로 기지국간 핸드오버 처리를 요구한다. 기지국 11에서 기지국 21로 이동 시에는 교환기 10의 영역을 벗어났으므로 교환기 10으로 교환기간 핸드오버 처리를 요구하며, 이동단말이 기지국 11에서 기지국 21로 이동한 후에 다시 기지국 31로 이동한 경우에는 교환기 20으로 연속적인 교환기간 핸드오버 처리 요구를 한다.2 is a diagram illustrating a case where a handover occurs, and a mobile terminal in a call requests a handover when the mobile terminal in a call measures a pilot channel signal strength of a neighboring base station and becomes stronger than a predetermined value. When the mobile station moves from base station 11 to base station 12, the base station requests the base station handover process to the exchange 10. When the base station 11 moves from the base station 21 to the base station 21, the exchange period handover processing is requested to the switch 10. If the mobile station moves from the base station 11 to the base station 21 and then moves back to the base station 31, the exchange At 20, a continuous exchange period handover processing request is made.

제3도는 본 발명의 제1실시예에 따른 기지국간 핸드오버를 처리하기 위한 정보 흐름도이다. 기지국간 핸드오버는 통화 중인 이동단말이 같은 교환기의 제어를 받는 다른 기지국의 영역으로 이동했을 때 발생한다. 이동단말과 기지국의 무선 자원 제어 기능에서 주변 기지국의 파일롯 채널 신호 세기를 측정하여 일정치 이상으로 강해지면, 소프트 핸드오버인지 하드 핸드오버인지를 결정하여(301) 기지국의 TACF1으로 핸드오버 요구(302)를 한다. 소프트 핸드오버는 이동단말이 동일한 주파수가 할당된 CDMA 무선 채널 사이를 이동할 때 발생하는 핸드오버로서, 이동단말은 두개 이상의 무선 베어러를 동시에 설정할 수 있다. 하드 핸드오버는 상이한 주파수를 갖는 기지국 사이를 이동할 때 발생하는 핸드오버로서, 이동단말은 하나의 무선 베어러만 설정할 수 있다.3 is an information flow diagram for processing inter-base station handover according to the first embodiment of the present invention. Inter-base station handover occurs when a mobile station in a call moves to an area of another base station under the control of the same exchange. In the radio resource control function of the mobile station and the base station, if the pilot channel signal strength of the neighboring base station is measured to be stronger than a predetermined value, it is determined whether it is a soft handover or a hard handover (301) and a handover request is made to the TACF1 of the base station (302). ) Soft handover is a handover that occurs when a mobile station moves between CDMA radio channels assigned the same frequency, and the mobile station can simultaneously set up two or more radio bearers. Hard handover is a handover that occurs when moving between base stations having different frequencies, and a mobile terminal can establish only one radio bearer.

TACF1에서 교환기의 CCF로 핸드오버 요구를 하면, CCF1에서는 기지국으로부터 수신한 메시지 내의 핸드오버 대상 기지국 정보를 분석하여 교환기 내의 기지국간 핸드오버인 경우에는 새로운 기지국 2의 TACF2로 베어러 연결 요구(303)를 한다. TACF2에서는 BCF2로 유선 베어러 연결 요구(304)를 하여 응답(305)를 수신하면, BCFr2로 유무선 베어러 연결 요구(306)를 한다. BCFr2에서는 새로운 유무선 베어러를 연결할 자원이 있는 경우에는 TACF2로 유무선 베어러 연결을 계속(307) 진행할 수 있다는 것을 통보하고, TACF2에서는 CCF로 베어러 연결 계속(308)를 통보한다. CCF에서는 핸드오버를 요구함 기지국의 TACF1으로 핸드오버를 계속(309)진행할 것을 통보하고, TACF1에서는 이동단말의 TACAF로 새로운 기지국2으로 핸드오버할 것을 명령(310)한다. 이동단말의 TACAF에서는 BCAF2로 새로운 기지국2와의 무선 베어러 연결 요구(311)를 한다. 이동단말의 BCAF2와 기지국 2의 BCFr2는 새로운 무선 채널을 할당하여 연결(312)한다. 기지국 2의 BCFr2에서는 TACF2로 유무선 베어러 연결 요구(306)에 대해 응답(314)을 전송하고, TACF2에서는 CCF로 베어러 연결 요구(303)에 대한 응답(315)을 전송한다.When TACF1 makes a handover request to the CCF of the exchange, CCF1 analyzes the handover target base station information in the message received from the base station, and in the case of handover between base stations in the exchange, bearer connection request 303 to TACF2 of new base station 2; do. When TACF2 receives a response 305 by making a wired bearer connection request 304 to BCF2, a wired / wireless bearer connection request 306 is made to BCFr2. If BCFr2 has resources to connect a new wired / wireless bearer, the BCFr2 notifies the TACF2 that the wired / wireless bearer connection can continue (307), and the TACF2 notifies the CCF of the bearer connection continued (308). The CCF requests a handover. The base station notifies the TACF1 of the base station to continue the handover (309), and the TACF1 instructs the mobile terminal to handover to the new base station 2 (310). In the TACAF of the mobile terminal, a radio bearer connection request 311 with the new base station 2 is made with BCAF2. The BCAF2 of the mobile terminal and the BCFr2 of the base station 2 allocate and connect a new radio channel (312). BCFr2 of base station 2 transmits response 314 to wired / wireless bearer connection request 306 to TACF2, and TACF2 transmits response 315 to bearer connection request 303 to CCF.

하드 핸드오버인 경우에는 이동단말과 새로운 기지국2과의 유무선 베어러가 연결된 이후에 기지국1과 연결된 이전의 유무선 베어러를 복구(316 내지 323)하며, 소프트 핸드오버인 경우에는 이동단말과 기지국의 무선 자원 제어 기능에서 파일롯 채널 신호 세기를 측정하여 일정치 이상으로 약해지면, 핸드오버 종료를 이전의 기지국1으로 통보(324)하고, TACF1에서는 CCF로 핸드오버 연결 복구 요구(325)를 하여, 이동단말과 기지국1과 연결된 이전의 유무선 베어러를 복구(325 내지 334)한다.In the case of hard handover, after the wired and wireless bearers of the mobile station and the new base station 2 are connected, the previous wired and wireless bearers connected to the base station 1 are restored (316 to 323). In the case of soft handover, the radio resources of the mobile station and the base station are When the control function measures the pilot channel signal strength and weakens it to a predetermined value or more, the previous base station 1 is notified of the end of the handover (324), and the handover connection recovery request (325) is sent to the CCF by the TACF1 to the mobile terminal. The previous wired / wireless bearer connected to the base station 1 is recovered (325 to 334).

제4도는 본 발명의 제2실시예에 따른 교환기간 핸드오버 제어 절차를 설명하기 위한 정보 흐름도이다. 교환기간 핸드오버는 통화 중인 이동단말이 서비스를 제공 중인 교환기에서 핸드오버를 수용하게 될 다른 교환기 영역으로 이동하였을 경우에 발생한다. 기지국1의 TACF1로부터 핸드오버 요구(402) 메시지를 수신한 서비스 교환기1의 CCF1에서는 핸드오버 영역이 현재 서비스 중인 교환기가 아닌 다른 교환기 영역인 경우에는 핸드오버를 수용할 대상 교환기2의 CCF2로 교환기간 베어러 연결 요구(403)를 수행한다. 교환기2의 CCF2에서는 새로운 기지국 2와의 유무선 베어러 연결(404 내지 409)을 한 후, 서비스 중인 교환기 1의 CCF1으로 베어러 연결 계속(410) 메시지를 전송하여 이동단말이 새로운 기지국으로 핸드오버할 것을 요구(411 내지 418)한다. 핸드오버가 종료되면 기지국간 핸드오버에서와 같이 이전의 유무선 베어러를 복구(419 내지 436)한다.4 is an information flow diagram for explaining an exchange period handover control procedure according to a second embodiment of the present invention. Switching period handover occurs when a mobile terminal in a call has moved from the providing exchange to another exchange area that will accept the handover. In CCF1 of service exchange 1 that has received the handover request 402 message from TACF1 of base station 1, if the handover area is another exchange area other than the currently serving exchange, the exchange period is changed to CCF2 of target exchange 2 that will accept the handover. Perform bearer connection request 403. In CCF2 of exchange 2, after establishing a wired / wireless bearer connection (404 to 409) with a new base station 2, the mobile station transmits a bearer connection continuation 410 message to the CCF1 of the serving exchange 1 and requests the mobile terminal to handover to the new base station ( 411 to 418). When the handover ends, the previous wired and wireless bearers are restored (419 to 436) as in the inter-base station handover.

제5도는 본 발명의 제3실시예에 따른 연속적인 교환기간 핸드오버에 제어절차를 설명하기 위한 흐름도이며, 이는 교환기간 핸드오버 수행 후 다른 교환기 영역으로 이동한 경우 발생된다. 이동단말이 교환기1에서 교환기2로 교환기간의 핸드오버를 수행한 후 새로운 교환기3으로 이동한 경우 연속적인 교환기간 핸드오버가 발생한다. 서비스 중인 교환기2의 기지국2로부터 수신한 핸드오버 요구(502)가 다른 교환기 관할 영역으로 이동인 경우인 경우에 연속적인 핸드오버 요구(503) 메시지를 호가 최초로 성립된 기점 교환기1의 CCF1로 전송한다. 기점 교환기1에서는 핸드오버를 수행할 대상 교환기3의 CCF3로 제4도에서 정의한 교환기간 핸드오버를 수행(503 내지 511)한다. 기점 교환기 1의 CCF1에서는 서비스 교환기2의 CCF2로 연속적인 핸드오버 응답(512)을 전송하여 핸드오버가 계속 진행됨을 통보하고 이동단말이 새로운 교환기3의 기지국3으로 핸드오버할 것을 명령(513,514)한다. 이동단말의 TACAF에서는 BACF3로 새로운 기지국3과의 무선 베어러 연결(515 내지 517)을 한다. BCFr3에서는 TACF3로 유무선 베어러 연결 요구(508)에 대해 응답(518)을 전송하고, TACF3에서는 CCF3으로 베어러 연결 요구(505)에 대한 응답(519)을 전송한다. CCF3에서는 CCF1으로 교환기간 베어러 연결 요구(504)에 대한 응답(520)을 전송하며, CCF1에서는 이전에 서비스를 수행한 교환기2의 CCF2로 베어러 복구 요구(521)를 하여 CCF1과 CCF2간의 베어러를 복구하고, CCF2에서는 TACF2로 이전에 사용한 유무선 베어러를 복구(522 내지 540)한다.5 is a flowchart illustrating a control procedure for continuous exchange period handover according to the third embodiment of the present invention, which is generated when the switch unit moves to another exchange area after performing the exchange period handover. When the mobile station performs a handover of the exchange period from the switch 1 to the switch 2 and then moves to a new switch 3, a continuous switch period handover occurs. If the handover request 502 received from the base station 2 of the switching exchange 2 in service is a move to another exchange jurisdiction, a successive handover request 503 message is transmitted to CCF1 of the originating exchange 1 in which the call was first established. . The originating exchange 1 performs the exchange period handover defined in FIG. 4 to CCF3 of the target exchange 3 to perform the handover (503 to 511). CCF1 of the originating exchange 1 sends a continuous handover response 512 to the CCF2 of the service exchange 2, notifying that the handover continues, and instructing the mobile terminal to handover to the base station 3 of the new exchange 3 (513,514). . In the TACAF of the mobile terminal, a radio bearer connection (515 to 517) with a new base station 3 is performed with BACF3. The BCFr3 sends a response 518 to the TACF3 for the wired / wireless bearer connection request 508, and the TACF3 sends a response 519 for the bearer connection request 505 to the CCF3. CCF3 sends a response 520 to the exchange period bearer connection request 504 to CCF1, and CCF1 recovers the bearer between CCF1 and CCF2 by making a bearer recovery request 521 to CCF2 of the exchange 2 that previously served. In CCF2, the wired / wireless bearer previously used for TACF2 is restored (522 to 540).

상술한 바와 같이 본 발명에 의하면 이동 가입자가 통화 중에 이동을 하더라도 통화의 단절이 없이 호를 계속 유지할 수 있도록 하며, 또한 이동단말과 서비스를 제공 중인 기지국에서 모두 무선 채널 상태를 측정하고, 서비스 중인 기지국에서 핸드오버 대상 기지국으로 핸드오버를 요구하므로 데이터 베이스의 검색이 필요하지 않는 효과가 있다.As described above, according to the present invention, even if the mobile subscriber moves during the call, the mobile subscriber can maintain the call without disconnection, and the mobile station and the base station providing the service both measure the radio channel state and serve the base station. Since a handover is requested from the base station to which the handover is performed, the search of the database is not required.

Claims

Detecting, by the terminal access control function of the first base station, a handover that occurs when the mobile terminal in the call moves from the first base station to the area of the second base station under the control of the same exchange; Requesting handover from the terminal access control function of the first base station to the call control function of the exchange; requesting a bearer connection to a second base station from the call control function of the exchange receiving the handover request; After the bearer connection is received by the second base station receiving the connection request, notifying the call control function of the exchange, and the terminal access control function of the issuing station requesting handover in the call control function of the exchange notified of the bearer connection. Notifying that the handover is to continue, and the first base station informed to continue the handover. Instructing handover from a terminal access control function to a terminal access control management function of a mobile terminal, requesting a radio bearer connection with a second base station from a terminal access control management function of the mobile terminal to a bearer control management function; Allocating and connecting a new radio channel with a radio bearer control function of a second base station in a bearer control management function of a mobile terminal that is requested to connect with the radio bearer; and a second base station in a radio bearer control function of the second base station. Transmitting a response to the wired / wireless bearer connection request to the terminal access control function of the terminal; and transmitting a response to the bearer connection request from the terminal access control function that receives the response to the wired / wireless bearer connection request to the call control function of the exchange. And, if the handover set by the above step ends And recovering the sun bearer resource.

The method of claim 1, wherein the bearer connection in the second base station comprises the step of requesting a wired bearer connection from the terminal access control function of the second base station that receives the bearer connection request from the call control function of the exchange to the bearer control function; Connecting the wired bearer in the bearer control function receiving the wired bearer connection request and responding to the terminal access control function; and in the terminal access control function of the second base station receiving the wired bearer connection response, the wired / wireless bearer as the radio bearer function. Requesting connection, and notifying the terminal connection control function to continue the wired / wireless bearer connection when there is a resource connected to a new wired / wireless bearer in the radio bearer function receiving the wired / wireless bearer connection request, and the wired / wireless bearer connection Terminal access controller notified of continued progress The handover control method according to claim consisting of the steps of the notification bearer connection continues with the call control function of the exchange in.

The method of claim 1, wherein the recovering of the wired / wireless bearer resource includes recovering the previous wired / wireless bearer connected to the first base station after the wired / wireless bearer between the mobile station and the second base station is connected in the case of hard handover. Handover Control Method.

2. The method of claim 1, wherein the recovering of the wired / wireless bearer resource comprises: measuring a pilot channel signal strength in a radio resource control function of a mobile station and a base station in a soft handover; If it is weak, notifying the end of the handover to the terminal access control function of the first base station; requesting the handover connection recovery from the terminal access control function notified of the end of the handover to the call control function of the exchange; And restoring a previous wired / wireless bearer connected to a mobile station and a first base station in a call control function notified of the handover recovery request.

Detecting, by the terminal access control function of the first base station, a handover generated when the mobile terminal in the call moves from the providing first exchange to the second exchange area that will receive the handover; Requesting handover from the detected terminal access control function of the first base station to the call control function of the first exchange; and the callover function of the first exchange receiving the handover request from the first switch station to which the handover area is currently serving. Requesting exchange period bearer connection to the call control function of the second exchange to accept handover in the case of exchange area other than the first exchange; and a second call control function of the second exchange that is requested to exchange the bearer period. Requesting a wired / wireless bearer connection to a base station; and connecting a bearer at a second base station receiving the wired / wireless bearer connection request; Transmitting a bearer connection continuation message to a call control function of a second exchange; transmitting a bearer connection continuation message received at a call control function of the second exchange to a call control function of a first exchange; Notifying the mobile station of the first exchange to continue the handover from the call control function of the first exchange receiving the continue message, and the terminal access control function of the first base station notified to continue the handover. Instructing handover to a terminal access control management function of a mobile terminal, requesting a radio bearer connection of a second base station from a terminal access control management function of the mobile terminal to a bearer control management function, and connecting the radio bearer Radio bearer control function of the second base station in the bearer control management function of the mobile station Allocating and connecting a new radio channel, transmitting a response to the wired / wireless bearer connection request from the radio bearer control function of the second base station to the terminal access control function of the second base station, and transmitting the response to the wired / wireless bearer connection request. Transmitting a response to a bearer connection request from the terminal access control function receiving the response to the call control function of the second exchange, and recovering the wired / wireless bearer resource when the handover set by the step is terminated. Handover control method characterized in that.

6. The method of claim 5, wherein the bearer connection in the second base station comprises: requesting a wired bearer connection from the terminal access control function of the second base station receiving the bearer connection request from the call control function of the second exchange to the bearer control function; Connecting to a wired bearer in the bearer control function receiving the wired bearer connection request, and responding to the terminal access control function; and in the terminal access control function of the second base station receiving the wired bearer connection response; Requesting a wired / wireless bearer connection, and notifying the terminal access control to continue the wired / wireless bearer connection when there is a resource to connect a new wired / wireless bearer in the radio bearer function receiving the wired / wireless bearer connection request; Terminal connection notified of continuation of wired and wireless bearer connection The handover control method, characterized in that made in the control function to step to inform the bearer connection continues with the call control function of the second heat exchanger.

6. The method of claim 5, wherein the recovering of the wired / wireless bearer resource comprises recovering a previous wired / wireless bearer connected to the first base station after the wired / wireless bearer between the mobile station and the second base station is connected in the case of hard handover. Handover Control Method.

6. The method of claim 5, wherein the recovering of the wired / wireless bearer resource comprises: measuring a pilot channel signal strength in a radio resource control function of a mobile station and a base station in a soft handover; When the terminal is weakened, notifying the end of the handover to the terminal access control function of the first base station, and requesting the handover connection recovery from the terminal access control function notified of the end of the handover to the call control function of the first exchange. And restoring a previous wired / wireless bearer connected to the mobile station and the first base station in the call control function notified of the handover recovery request.

Detecting, by the single access control function of the second base station, a handover generated when the user moves to the third exchange area after performing the exchange period handover from the first exchange to the second exchange; and handover detected by the single access control function. Requesting to the call control function of the second exchange, requesting continuous handover from the call control function of the second exchange that receives the handover request to the call control function of the first exchange, Requesting a bearer connection from the call control function of the third exchange receiving the handover request to the call control function of the third exchange, and from the call control function of the third exchange receiving the bearer connection request to the third base station. Requesting a connection, connecting the bearer at the third base station receiving the bearer connection request, and then performing a bearer as a call control function of the third exchange. Notifying to continue the connection, notifying the bearer connection continuation message received by the call control function of the third exchange to the call control function of the first exchange, and receiving the bearer connection continuation message by the first switch. Answering the continuous handover from the call control function of the second exchange to the call control function of the second exchange, and from the call control function of the second exchange receiving the continuous handover response to the terminal access control function of the second base station. Instructing to continue to over, instructing handover from the terminal access control function of the second base station notified to continue the handover to the terminal access control management function of the mobile terminal, and Requesting a radio bearer connection with a third base station from a terminal access control management function to a bearer control management function; Assigning and connecting a radio bearer control function of a third base station and a new radio channel in a bearer control management function of a mobile terminal that is requested to bearer connection; and accessing a terminal of the third base station in a radio bearer control function of the third base station Transmitting a response to the wired / wireless bearer connection request to a control function; transmitting a response to the bearer connection request from a terminal access control function that receives the response to the wired / wireless bearer connection request to a call control function of a third exchange; Restoring the wired / wireless bearer resources when the handover set by the step is terminated.

10. The method of claim 9, wherein the bearer connection in the third base station comprises: requesting a wired bearer connection from the terminal access control function of the third base station receiving the bearer connection request from the call control function of the third exchange to the bearer control function; Connecting the wired bearer in the bearer control function receiving the wired bearer connection request, and responding to the terminal access control function; and in the terminal access control function of the third base station receiving the wired bearer connection response, to the radio bearer function. Requesting a wired / wireless bearer connection, and notifying the terminal access control to continue the wired / wireless bearer connection when there is a resource to connect a new wired / wireless bearer in the wireless bearer function receiving the wired / wireless bearer connection request; Terminal access notified to continue bearer connection The handover control method, characterized in that comprising the step of notification to the bearer connection continues with the call control functions of the third heat exchanger in the control function.

10. The method of claim 9, wherein the recovering of the wired / wireless bearer resources includes recovering a previous wired / wireless bearer connected to the second base station after the wired / wireless bearer between the mobile station and the third base station is connected in the case of hard handover. Handover control method.

10. The method of claim 9, wherein the recovering of the wired / wireless bearer resource comprises: measuring a pilot channel signal strength in a radio resource control function of a mobile station and a base station in case of soft handover; If it is weak, the step of notifying the end of the handover to the terminal access control function of the second base station, and the handover connection recovery request from the terminal access control function notified of the end of the handover to the call control function of the second exchange And restoring a previous wired / wireless bearer connected to a mobile station and a third base station in the call control function notified of the handover recovery request.