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Random Access Failure in Wireless Device Multiple Timing Advance Groups

  • US 20130188473A1
  • Filed: 01/25/2013
  • Published: 07/25/2013
  • Est. Priority Date: 01/25/2012
  • Status: Active Grant
First Claim
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1. :

  • A method comprising;

    a) repeatedly transmitting, by a wireless device to a base station, a first random access preamble on a primary cell until;

    i) a first random access response corresponding to said first random access preamble is received from said base station;

    orii) a first predetermined number of transmissions is reached;

    b) if said first predetermined number of transmissions is reached without receiving said first random access response;

    i) indicating a random access problem to a radio resource control layer in said wireless device; and

    ii) said radio resource control layer determining a radio link failure;

    c) receiving, by said wireless device, at least one control message from said base station, said at least one control message causing in said wireless device;

    i) configuration of a plurality of cells comprising a primary cell and at least one secondary cell, said plurality of cells employed for communication between said wireless device and said base station; and

    ii) 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 secondary cell group comprising a subset of said at least one secondary cell;

    d) receiving, by said wireless device from said base station, a control command causing said wireless device to transmit to said base station a second random access preamble on said first secondary cell in said secondary cell group;

    e) repeatedly transmitting, by said wireless device to said base station, said second random access preamble until;

    i) a second random access response corresponding to said second random access preamble is received from said base station;

    orii) a second predetermined number of transmissions is reached; and

    f) if said second predetermined number of transmissions is reached without receiving said second random access response, said wireless device;

    i) stopping transmission of said second random access preamble to said base station; and

    ii) keeping a connection with said base station active.

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