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특허 상세정보

MyON담기
내보내기 페이스북 공유 카카오톡 공유

Method and system for determining position of a cellular mobile terminal

특허상세정보
국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) H04Q-007/20   
미국특허분류(USC) 455/456 ; 342/457
출원번호 US-0935421 (1997-09-23)
발명자 / 주소
  • Cedervall Mats,SEX
  • Lundqvist Patrik,SEX
출원인 / 주소
  • Telefonaktiebolaget L M Ericsson (publ), SEX
대리인 / 주소
    Jenkens & Gilchrist, P.C.
인용정보 피인용 횟수 : 143  인용 특허 : 4
초록
▼

A method and system are disclosed by which a round-trip calculation is used to determine the distance between a mobile radio station (MS) and a radio base station (BS) using the apparent uplink and downlink signal propagation air-times (e.g., T-up and T-down). As such, no absolute time reference is required. The MS and BS report to a service node in the mobile network the local departure and arrival times of the uplink and downlink signals, and calculate the apparent air-times, T-up and T-down. The distance, D, between the MS and BS can be calculated as ...

대표
청구항
▼

[ What is claimed is:] [1.] A method for determining the round-trip air-time between a mobile radio station and a first radio base station, comprising the steps of:said mobile radio station and said first radio base station each determining a local time of transmission of an uplink signal and a downlink signal respectively;said mobile radio station and said first radio base station each determining a local time of reception of said downlink signal and said uplink signal respectively;calculating an apparent uplink air-time from said local time of transmis...

이 특허에 인용된 특허 (4)

  1. Manabe Shinichi (Tokyo JPX), Digital mobile communications system and method for providing intensity/coverage reference maps using base stations and.
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  4. Hatakeyama Izumi (Tokyo JPX), Mobile communication system.

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