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Multicarrier communications employing time alignment timers

  • US 9,848,445 B2
  • Filed: 12/06/2015
  • Issued: 12/19/2017
  • Est. Priority Date: 01/25/2012
  • Status: Active Grant
First Claim
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1. A method comprising:

  • receiving, by a wireless device, at least one control message comprising;

    configuration parameters associated with a plurality of cells comprising a primary cell group and a secondary cell group;

    a first parameter for a first time alignment timer (TAT) associated with the primary cell group; and

    a second parameter for a second TAT associated with the secondary cell group;

    in response to the first TAT expiring, for a cell of the plurality of cells;

    stopping uplink transmissions of Hybrid Automatic Repeat Request (HARQ) positive acknowledgements and HARQ negative acknowledgements;

    stopping re-transmissions of uplink transport blocks in response to downlink HARQ negative acknowledgements;

    stopping transmissions of new uplink transport blocks and channel state information; and

    allowing uplink transmission of at least one random access preamble; and

    in response to both the second TAT expiring and the first TAT running, for an activated cell of the secondary cell group;

    stopping re-transmissions of uplink transport blocks in response to downlink HARQ negative acknowledgements;

    stopping transmissions of new uplink transport blocks;

    continuing transmissions of HARQ positive acknowledgements and HARQ negative acknowledgements for transport blocks received via a downlink carrier associated with the activated cell; and

    continuing transmissions of channel state information for the downlink carrier associated with the activated cell.

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