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Spread spectrum time-division multiple access communication scheme

  • US 6,493,334 B1
  • Filed: 07/13/1999
  • Issued: 12/10/2002
  • Est. Priority Date: 05/26/1999
  • Status: Expired due to Fees
First Claim
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1. A method of transmitting access request messages (ARMs) to gain access to packet data transmission channels in a cellular radio CDMA system, the method comprising the steps of:

  • transmitting ARMs from multiple terminals as overlapping packets, where each identical packet contains several repetitions of an identical spreading sequence for each terminal;

    the ARMs corresponding to different terminals being arranged into frames;

    allocating a respective mini-slot in each frame to a particular terminal as an initial synchronization and identification reference for an ARM transmitted from the particular terminal;

    each ARM being longer than its associated mini-slot, but the beginning of the ARM being inside the mini-slot; and

    at each terminal, beginning to transmit data from the terminal after a base station allocates to it a packet data transmission channel upon successful receipt of an ARM.

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