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Method of transmitting timing advance data to a mobile station in a cellular mobile radio network and corresponding mobile station, base station controller and transmission system

  • US 5,479,409 A
  • Filed: 09/14/1993
  • Issued: 12/26/1995
  • Est. Priority Date: 09/15/1992
  • Status: Expired due to Fees
First Claim
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1. A method of exchanging information in a cellular mobile radio network between a mobile station (MS), at least first and second base transceiver stations (BTS1, BTS2) and a base station controller (BSC) of said first and second base transceiver stations (BTS1, BTS2), said exchanges of information between said mobile station (MS) and said first and second base transceiver stations (BTS1, BTS2) being time-division multiple access exchanges, said method comprising the steps of:

  • transmitting from said base station controller (BSC) to said mobile station (MS), via said first base transceiver station (BTS1) with which said mobile station is communicating, an instruction (HO CHN) telling said mobile station (MS) to interrupt communication with said first base transceiver station (BTS1) in order to send to said second base transceiver station (BTS2) a first sequence of synchronization signals (HO ACCESS) enabling said second base transceiver station (BTS2) to calculate a timing advance (TA), said instruction (HO CHN) being transmitted when said mobile station (MS) moves from a first cell (C1) defined by the geographical coverage area of said first base transceiver station (BTS1) to a second cell (C2) defined by the geographical coverage area of said second base transceiver station (BTS2),said instruction (HO CHN) supplied to said mobile station (MS) also indicates that said mobile station (MS) must continue to communicate with said first base transceiver station (BTS1) immediately after sending said first sequence of synchronization signals (HO ACCESS) to said second base transceiver station (BTS2),transmitting said calculated timing advance (TA) from said second base transceiver station (BTS2) to said base station controller (BSC), andtransmitting said calculated timing advance (TA) from said controller (BSC) to said mobile station (MS) via said first base transceiver station (BTS1), said mobile station (MS) communicating with said second base transceiver station (BTS2) in accordance with said timing advance (TA).

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