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Almost blank subframe in carrier aggregation

  • US 9,900,882 B2
  • Filed: 01/13/2017
  • Issued: 02/20/2018
  • Est. Priority Date: 10/29/2011
  • Status: Active Grant
First Claim
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1. A method comprising:

  • transmitting, by a base station, a first message comprising a subframe allocation bitmap indicating a plurality of Almost Blank Subframes, wherein the plurality of Almost Blank Subframes consists of second, fourth, seventh, and ninth subframes of each radio frame in a plurality of radio frames;

    transmitting, to a wireless device, a second message comprising;

    a first measurement subframe allocation bitmap indicating a first plurality of measurement subframes of a primary carrier, wherein the first plurality of measurement subframes excludes the plurality of Almost Blank Subframes; and

    a second measurement subframe allocation bitmap indicating a second plurality of measurement subframes of the primary carrier, wherein the second plurality of measurement subframes excludes the first plurality of measurement subframes; and

    transmitting, by the base station, a first Almost Blank Subframe, wherein the first Almost Blank Subframe is transmitted at a power level that is lower than during a non-Almost Blank Subframe.

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