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Method and apparatus for initializing a packet traffic channel in a communication system

  • US 6,717,916 B1
  • Filed: 07/14/1998
  • Issued: 04/06/2004
  • Est. Priority Date: 07/25/1997
  • Status: Expired due to Term
First Claim
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1. A method of initializing a packet traffic channel for synchronizing packet traffic channels between a base station and a mobile station at a state transition from a packet idle state to a packet busy state in a mobile communication system wherein the base station has a forward packet traffic channel and a packet traffic control channel and the mobile station has a reverse packet channel, and the base station transmits a packet control message for assigning time slots of the forward or the reverse packet traffic channel via a packet control channel when generating packet data to be communicated with a specific mobile station in the packet idle state, the base station and the mobile station transition to the packet busy state by occupying the forward or the reverse packet traffic channel in an assigned time slot and communicating the packet data via the occupied time slot of the forward or the reverse packet traffic channel between the base station, and then the mobile station and the base station transition to the packet idle state, comprising the steps of:

  • (a) measuring and storing a delay time of a forward channel signal transmitted from the base station to the mobile station, and reporting the delay time to the base station in order to synchronize the timing of the mobile station to the timing of the base station, in the packet idle state after a call set up;

    (b) controlling access collision between mobile stations attempting to access a base station by assigning a specific time slot to each mobile station in an access attempt, and causing the mobile station to access in the assigned time slot;

    (c) achieving mobile acquisition rapidly by repeatedly using short preamble patterns for mobile stations; and

    (d) performing power control on the packet traffic channel by adding correlation values in a search window of the specific time slot.

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