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United access channel for use in a mobile communications system

  • US 5,740,166 A
  • Filed: 03/18/1996
  • Issued: 04/14/1998
  • Est. Priority Date: 03/18/1996
  • Status: Expired due to Term
First Claim
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1. A method of operating a first base station in a cellular telecommunications system, wherein the first base station has first and second transceivers that receive radio signals that are divided into uplink time slots, the method comprising the steps of:

  • operating the first transceiver in synchronization with a first frame of uplink time slots;

    operating the second transceiver in synchronization with a second frame of uplink time slots, wherein the second frame of uplink time slots are offset by a predetermined amount of time relative to the first frame of uplink time slots; and

    using a first time slot in each of the first and second transceivers in combination so as to provide a united random access channel, whereby when a mobile station transmits an uplink radio frequency burst, access of the first base station by the mobile station is recognized if the uplink radio frequency burst is received by the first transceiver during the first transceiver'"'"'s first time slot, and access of the first base station by the mobile station is recognized if the uplink radio frequency burst is received by the second transceiver during the second transceiver'"'"'s first time slot,wherein the uplink radio frequency burst is received by both the first and second transceivers during the respective first time slots of the first and second transceivers,and further comprising the steps of;

    detecting a first access attempt during the first time slot of the first transceiver;

    detecting a second access attempt during the first time slot of the second transceiver; and

    comparing at least one of message contents, frame number and access delay of the first and second access attempts and determining that they correspond to an access attempt by one mobile station on the basis of the comparison.

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