KR960020577A

KR960020577A - Hard Handoff Control Method in CDMA Mobile Switching System

Info

Publication number: KR960020577A
Application number: KR1019940032098A
Authority: KR
Inventors: 박현화; 정동수; 김대식; 안지환
Original assignee: 양승택; 재단법인 한국전자통신연구소
Priority date: 1994-11-30
Filing date: 1994-11-30
Publication date: 1996-06-17
Also published as: KR0123398B1; CN1084572C; CN1115165A

Abstract

본 발명은 CDMA 이동통신 교환기에서의 하드 핸드오프의 제어 방법에 관한 것이다.The present invention relates to a method for controlling hard handoff in a CDMA mobile switching center.

본 발명은 기지국으로부터 이동국의 이동에 의한 핸드오프 요구 메시지를 수신한 후, 스위치를 변경할 때, 상대 가입자와의 통화로에 영향을 미치지 않기 위하여 교환기 내부 통화 경로를 구성하는 제1단계, 핸드오프 처리시 교환기에서 호의 절단없이 통화로를 절체하는 제2단계, 연속적인 교환기간의 앤드오프 발생시 통화 경로의 최소화를 위하여 최초 호를 시도한 교환기와 핸드오프를 수용할 교환기간의 경로를 구성하는 제3단계, 핸드오프 처리시 교환기간의 중계선 연결이나 복구를 위하여 공통선 신호망의 국간 신호 방식을 이용하여 송수신하는 제4단계로 구성되는 것을 특징하며, 상기와 같이 수행되는 본 발명에 의해 상대 가입자의 스위치에 영향을 미치지 않고, 통화 상태의 저하 없이 새로운 통화로로 변경할 수 있으며, 연속적인 핸드오프를 수행해야 할 경우에 중간 교환기를 배제하여 통화 경로를 최소화할 수 있는 효과가 있다.The present invention provides a first step of configuring a switch internal call path so as not to affect a call path with a counterpart subscriber when changing a switch after receiving a handoff request message by a mobile station from a base station, a handoff process A second step of switching the channel without disconnecting the call at the time exchange, and a third step of configuring the exchange period for accommodating the first call and the handoff for minimizing the call path in the event of end-off of consecutive exchange periods. And a fourth step of transmitting / receiving by using the inter-station signaling method of the common line signal network for relay line connection or recovery in the exchange period during handoff processing. You can change to a new call without affecting the call status, and continuous handoff It eliminates the intermediate heat exchanger if there is an effect that can be done to minimize the call path.

Description

Hard Handoff Control Method in CDMA Mobile Switching System

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제1도는 본 발명이 적용되는 이동통신교환기의 구조도.1 is a structural diagram of a mobile communication switch to which the present invention is applied.

Claims

Base station controller (BSC) (01); ASS (04) which is equipped with subscriber and repeater line matching device, time switch, various signaling devices and performs most of call processing function and its own maintenance, number translation among call processing functions, route control function, and space switch connection. INS (05) that performs centralized functions, etc. and CCS (06) that performs system-level operation management, maintenance, billing and control, and stores / manages processing and location information for mobile subscribers. A mobile communication exchange (MSC) (02) configured as a system to perform circuit switching services to subscribers, and perform functions such as location registration, handoff, and paging; And a Home Location Register (HLR) for permanently storing / managing subscriber information. 03. A hard handoff control method in a CDMA mobile switching center comprising: a handoff request message via a base station; As a result of analyzing the handoff type (201, 202; 301, 302; 401, 402; 501, 502), the first exchanger 20 processes the handoff when the handoff type is a handoff between base stations in the exchange. 213); A second step (303 to 319) for processing the handoff when the type of the handoff is Handoff Forward; A third step (403 to 418) for processing handoff when the type of handoff is Handoff Backward; And a fourth step (503 to 524) of processing the handoff when the handoff type is a handoff to the second exchange.

2. The method of claim 1, wherein the first step comprises: establishing (204) an internal call path within the exchange; Sending (205) a handoff request message to a base station (BSC j) 31 to perform handoff at the exchange; If the exchange 22, which has received the handoff response message from the base station (BSC j) 31, can establish a traffic channel, it transmits a handoff performance message to the target base station (BSC j) 31 and constructs a new call path. 208, 206, 207, 208, 209 to send a handoff command message to the serving base 21 in service; When the exchange 22 receives the handoff completion message from the target base station (BSC j) 31, transferring the old call path to the new call path (210, 211); And a step (212, 213) of terminating the handoff when the exchange 22 requests the traffic channel recovery request to the base station (BSC j) 31, which previously provided the service, and receives the response message. Hard Handoff Control Method in Communication Switch.

2. The method of claim 1, wherein the second step comprises the steps of: first setting an internal call path in the exchange when the handoff occurred is the first handoff, and omitting if there is a handoff between base stations before; After the serving exchange (MSC i) 22 has occupied the trunk with the target exchange (MSC j) 32 to accept the handoff, the resource exchange request message can be received by the target exchange (MSC j) (32). ) Transmits (305, 306); The target exchange 32 making a handoff request to a target base station (BSC j) 31 that will accept the handoff and receiving a handoff response message (307, 308); The exchange (MSC j) 32 receiving the message sends a handoff message to the base station (BSC j) 31 if it is able to establish a traffic channel within the message, and establishes a call path with the base station 31. Transmitting (309, 310) the resource occupancy request response message to the service switcher 22; The exchange (MSC i) 22 that receives the resource occupancy request response message establishes a call path with the target exchange (MSC j) 32, and sends a handoff command message to the base station (BSC j) 21 that requested handoff. When the target exchange 32 receives the handoff completion message from the base station (BSC j) 31, it transmits a radio channel occupancy notification message to the exchange 22 in service and the base station (BSC j). Connecting the call paths with (31) (314, 315, 316); And the traffic exchange (MSC i) 22 transfers the traffic channel recovery request message to the base station (BSC i) 21 after switching from the existing channel to the new channel with the target exchange (MSC j) 32. And when the completion message is received, the handoff forward procedure is terminated (317 to 319).

The BSC i of claim 1, wherein the third step is to transmit a handoff backward request message to the handoff target exchange 12, and then the MSC i 12 performs a handoff. 11) when a handoff request is received and the response is received, a handoff execution message is transmitted to the base station (BSC i) 11 and a call path is established with the base station 11 (404 to 408); (409, 410) the service exchange (MSC j) 22 receiving the handoff backward response message from the target exchange 12 transmitting the handoff command message to the base station (BSC j) 21 requesting the handoff; When the target exchange (MSC i) 12 receives the handoff completion message from the base station (BSC i) 11, a process of connecting a new call path and delivering a resource release request message to the service exchange 22 (411 to 411). 413); The previous MSC 22 receiving the message recovers the trunk of the exchange period, recovers the call path with the BSB, and transmits a traffic channel recovery request message. (414 to 416); And after the service exchanger 22 transmits a resource release request response message to the target exchange (MSC i) 12 and receives a traffic channel recovery complete message from the base station (BSC j) 21, the handoff backward procedure is performed. Hard handoff control method in a CDMA mobile communication switch characterized in that the termination is carried out (417, 418).

4. The method of claim 1, wherein the fourth step comprises: (504) the MSC (22) sending a handoff message to the third exchange to the originating exchange (MSC i) 12 in which the call was originally established; After the origin exchange 12 occupies the trunk with the target exchange (MSC k) 32 to perform the handoff, it transmits a resource occupancy request message, and the target exchange 32 performs a handoff (BSC k). Transmitting the handoff request message to the base station (BSC k) 31 after the handoff request message is transmitted to the base station (31); The target exchange 32 sending a resource occupancy request response message to the origin exchange 12, and constructing a new call path (510, 511); When the service exchanger 22 receives the handoff request response message from the originating exchange 12 to the third system, it transmits a handoff command message to the base station (BSC j) 21 and releases the resource from the originating exchange 12. Waiting for a request message (512, 513); When the target exchange (MSC k) 32 receives the handoff completion message from the base station (BSC k) 31, transmitting a radio occupancy channel notification message to the originating exchange MSC i and connecting a call path (514). 516); In the originating exchange 12, the transfer of the resource release request message is performed after the transfer from the channel with the previous exchange (MSC j) 22 to the channel with the new exchange 32. Recovering the trunk after transmission to the network (517 to 519); The former service exchange (MSC j) 22 recovers the trunk, restores the call log, and then sends a traffic channel recovery request message to the base station (MSC j) 22 and releases the resource to the origin exchange 12. Transmitting a response message (520 to 523); Receiving the traffic channel recovery complete message from the base station (BSC j) 21, the handoff procedure to the third system is terminated (step 524) characterized in that the hard handoff control method in the COMA mobile communication switch, characterized in that .

[4] The ASS-M (Access Switching Subsystem for Mobile Subscriber) according to claim 2 or 3, wherein the internal call path of the exchange maintains the call path with the counterpart subscriber without affecting the space switch or the time switch of the counterpart subscriber. Hard handoff control method in a CDMA mobile communication switch characterized in that it is set using the front junction (Front Junctor).

※ Note: The disclosure is based on the initial application.