Almost blank subframe allocation in heterogeneous network
First Claim
Patent Images
1. A method comprising:
- a) providing, by a first base station, an overlapping coverage area with each of a plurality of second base stations and each of a plurality of third base stations;
b) each of said plurality of second base stations;
i) allowing access to a plurality of wireless devices; and
ii) configuring a second plurality of Almost Blank Subframes, base stations in said plurality of second base stations configuring the same set of subframes as said second plurality of Almost Blank Subframes; and
c) each of said plurality of third base stations;
i) allowing access only to a restricted subset of said plurality of wireless devices; and
ii) configuring a third plurality of Almost Blank Subframes, at least two base stations in said plurality of third base stations not configuring the same set of subframes as said third plurality of Almost Blank Subframes; and
wherein during a majority of symbols of an Almost Blank Subframe of a base station;
signals are transmitted at an Almost Blank Subframe power level that is substantially lower than a transmit power during a non-Almost Blank Subframe.
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Abstract
A first base station provides overlapping coverage area with second base stations and third base stations. Second base stations allow regular access to wireless devices and configure a second plurality of almost blank subframes. Second base stations configure the same set of subframes as the second plurality of almost blank subframes. Third base stations allow regular access to a restricted subset of wireless devices and configure a third plurality of almost blank subframes. At least two base stations in the third base stations configure different set of subframes as the second plurality of almost blank subframes.
16 Citations
20 Claims
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1. A method comprising:
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a) providing, by a first base station, an overlapping coverage area with each of a plurality of second base stations and each of a plurality of third base stations; b) each of said plurality of second base stations; i) allowing access to a plurality of wireless devices; and ii) configuring a second plurality of Almost Blank Subframes, base stations in said plurality of second base stations configuring the same set of subframes as said second plurality of Almost Blank Subframes; and c) each of said plurality of third base stations; i) allowing access only to a restricted subset of said plurality of wireless devices; and ii) configuring a third plurality of Almost Blank Subframes, at least two base stations in said plurality of third base stations not configuring the same set of subframes as said third plurality of Almost Blank Subframes; and wherein during a majority of symbols of an Almost Blank Subframe of a base station;
signals are transmitted at an Almost Blank Subframe power level that is substantially lower than a transmit power during a non-Almost Blank Subframe. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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a) providing, by a first base station, an overlapping coverage area with each of a plurality of second base stations and each of a plurality of third base stations; b) each of said plurality of second base stations; i) allowing access to a plurality of wireless devices; and ii) transmitting, to a second plurality of wireless devices in connected mode, a second message comprising a second subframe allocation bitmap indicating a second plurality of subframes, said second plurality of subframes comprising a second plurality of Almost Blank Subframes, base stations in said plurality of second base stations identifying the same set of subframes as said second plurality of Almost Blank Subframes; and c) each of said plurality of third base stations; i) allowing access only to a restricted subset of said plurality of wireless devices; and ii) transmitting to a third plurality of wireless devices in connected mode, a third message comprising a third subframe allocation bitmap indicating a third plurality of subframes, said third plurality of subframes comprising a third plurality of Almost Blank Subframes, at least two base stations in said plurality of third base stations identifying different sets of subframes as said third plurality of Almost Blank Subframes. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification