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Carrier configuration in wireless networks

  • US 9,179,457 B2
  • Filed: 06/17/2013
  • Issued: 11/03/2015
  • Est. Priority Date: 06/20/2012
  • Status: Active Grant
First Claim
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1. A method for use in a wireless device, the method comprising:

  • a) receiving, from a base station, at least one first radio resource control (RRC) message comprising configuration parameters of a plurality of cells comprising a primary cell and at least one secondary cell, said plurality of cells being grouped into a plurality of cell groups, said plurality of cell groups comprising;

    i) a primary cell group comprising a first subset of said plurality of cells, said first subset comprising said primary cell, uplink signal transmissions by said wireless device in said primary cell group employing a first synchronization signal on said primary cell as a primary timing reference; and

    ii) a secondary cell group comprising a second subset of said at least one secondary cell, uplink signal transmissions by said wireless device in said secondary cell group employing a second synchronization signal on a secondary cell in said secondary cell group as a secondary timing reference;

    b) receiving, from said base station, a second RRC message, said second RRC message;

    i) configurable to cause modification of a cell group a secondary cell without explicitly releasing said secondary cell if said second RRC message comprises mobility control information; and

    ii) unconfigurable to cause modification of the cell group of said secondary cell without explicitly releasing said secondary cell if said RRC message does not comprise mobility control information;

    c) modifying the cell group of said secondary cell by releasing said secondary cell and then adding said secondary cell with a different cell group index, if said second RRC message does not comprise mobility control information; and

    d) initiating a handover if said second RRC message comprises mobility control information.

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