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Random Access Mechanism for a Wireless Device and Base Station

  • US 20130258882A1
  • Filed: 03/06/2013
  • Published: 10/03/2013
  • Est. Priority Date: 04/01/2012
  • Status: Active Grant
First Claim
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1. A method comprising:

  • a) receiving, by a wireless device to communicate employing a plurality of cells, at least one control message from a base station, said at least one control message;

    i) causing in said wireless device;

    (1) configuration of a primary cell and at least one secondary cell in said plurality of cells; and

    (2) assignment of each of said at least one secondary cell to a cell group in a plurality of cell groups, said plurality of cell groups comprising;

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

    (b) a secondary cell group comprising a second subset of said at least one secondary cell; and

    ii) comprising a pathloss reference for each secondary cell in said at least one secondary cell, said pathloss reference being only configurable as a downlink of said secondary cell if said secondary cell is in said secondary cell group; and

    b) transmitting, by said wireless device, uplink signals to said base station in a first secondary cell in said secondary cell group, wherein;

    i) transmission power of said uplink signals being determined, at least in part, employing a received power of said pathloss reference assigned to said first secondary cell; and

    ii) timing of said uplink signals in said secondary cell group employing a second synchronization signal on an activated secondary cell in said secondary cell group as a secondary timing reference.

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