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Wireless communications system and method

  • US 9,532,357 B2
  • Filed: 08/09/2012
  • Issued: 12/27/2016
  • Est. Priority Date: 08/19/2011
  • Status: Active Grant
First Claim
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1. A wireless communications system, comprising:

  • a base station;

    a relay device; and

    a terminal device;

    wherein the terminal device is configured to;

    transmit one or more access request messages of a first type to request uplink resources from the base station, the one or more access request messages of the first type including Random Access Channel preambles from a first group of Random Access Channel preambles, andtransmit an access request message of a second type if no response to the transmitted access request messages of the first type is received from the base station, the access request message of the second type including a Random Access Channel preamble from a second group of Random Access Channel preambles that is different from the first group of Random Access Channel preambles;

    wherein the base station is responsive to an access request message of the first type received from the terminal device to transmit an allocation of uplink resources to the terminal device;

    wherein the relay device is responsive to an access request message of the second type received from the terminal device to transmit a relayed access request message to the base station to request the base station to allocate uplink resources to the terminal device, wherein the relayed access request message includes a timing advance offset for a subsequent transmission from the terminal device to the relay device; and

    wherein the base station is responsive to the relayed access request message from the relay device to transmit an allocation of uplink resources to the terminal device.

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