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Configuring base station and wireless device carrier groups

  • US 9,161,322 B2
  • Filed: 01/24/2013
  • Issued: 10/13/2015
  • Est. Priority Date: 01/25/2012
  • Status: Active Grant
First Claim
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1. A method comprising:

  • a) transmitting, by a base station, at least one Radio Resource Control (RRC) message comprising;

    i) a cell group index of a secondary cell in at least one secondary cell, said cell group index identifying a secondary cell group in a plurality of cell groups, said plurality of cell groups comprising;

    (1) a primary cell group comprising a primary cell, uplink transmissions by a wireless device in said primary cell group employing a first synchronization signal on said primary cell as a primary timing reference; and

    (2) at least one secondary cell group, each of said at least one secondary cell group comprising a subset of said at least one secondary cell, uplink transmissions in a secondary cell group employing a second synchronization signal on a secondary cell as a secondary timing reference; and

    ii) MAC dedicated parameters comprising a sequence of at least one information element, an information element comprising;

    a first cell group index of a first secondary cell group and a timer value for a corresponding time alignment timer, said corresponding time alignment timer indicating how long said first secondary cell group is considered to be uplink time aligned; and

    b) transmitting a MAC timing advance command comprising said first cell group index causing restart of said corresponding time alignment timer.

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