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Trunked radio repeater system

  • US 4,905,302 A
  • Filed: 06/03/1987
  • Issued: 02/27/1990
  • Est. Priority Date: 06/03/1987
  • Status: Expired due to Term
First Claim
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1. A method for achieving reliable and prompt communication within a trunked radio repeater system having a digital control channel and plural working channels, which working channels are assigned for temporary use of individual radio units specified by digital control signals transmitted over the control channel, said control channal carrying inbound digital control signals from said radio units to a control site, said inbound digital control signals having a time-multiplexed format defining discrete signalling slots, said method comprising the steps of:

  • (a) requesting assignment of a working channel by passing digital request signals from a first radio unit to said control site over a control channel inbound digital signalling slot;

    (b) monitoring said control channel for responsive channel assignment signals returned over the control channel from the control site within a predetermined expected response time; and

    (c) if no such responsive channel assignment signals are detected, then (c1) repeating steps (a) and (b) within a retry time window, and (c2) increasing the duration of the retry time window as a function of the number of retries.

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