Journal of KIISE:Information Networking (한국정보과학회논문지:정보통신)

Korean Institute of Information Scientists and Engineers (한국정보과학회)
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A Calculation Method of Handoff Rate using Speed and Direction of Mobile Stations in Cellular Networks

셀룰러 망의 이동국 속도와 방향을 이용한 핸드오프율 계산법

  • 우매리 (영남대학교 컴퓨터공학과) ;
  • 최용준 ((주)인투정보) ;
  • 정영석 (경운대학교 컴퓨터공학과) ;
  • 임경수 (연암공업대학 컴퓨터정보기술과) ;
  • 김종근 (영남대학교 컴퓨터공학과)
  • Published : 2002.08.01
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Abstract

In CDMA cellular systems, a handoff process in which the mobile station (MS) can communicate with the target base station without interrupting the communication with the current base station makes contact with the target base station before it breaks with the station it is operating on. An MS requests a soft handoff to a neighbor base station (BS) whenever the pilot strength received from the neighbor BS exceeds the handoff threshold, even though the MS may not actually be approaching to the neighbor BS. Since two traffic channels have to assign to an MS during the soft handoff period, the utilization of traffic channels is wasted. Thus, an analysis of handoff rate is a key to understand and evaluate channel efficiency. In this paper, a simple and straightforward mathematical analysis method for evaluate obtaining direction-based soft handoff rate and the number of handoff calls in CDMA cellular systems is proposed.

CDMA셀룰러 시스템에서는 이동국이 한 셀에서 다른 셀로 이동할 때에 핸드오프영역에서 인접한 땅 셀의 채널을 신호를 동시에 점유함으로써 끊김 없는 연결을 가능하게 한다. 이 경우에 핸드오프 영역에 있는 이동국은 현재 셀의 신호 수신 지역을 벗어나지 않아도 양 기지국와 연결을 유지하는데 이것은 채널 효율성에 낭비를 가져온다. 따라서 핸드오프 율은 채널 효율성을 평가하는 중요한 요소이다. 본 논문에서는 CDMA셀룰러 시스템에서 이동국의 이동 속도와 방향을 기반으로 핸드오프 확률과 핸드오프 호수를 구하는 방식을 제안하였다.

Keywords

References

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