Almost blank subframe in carrier aggregation
Aspects are described for use in wireless communications. A subframe allocation bitmap may indicate multiple subframes. The indicated subframes may correspond to Almost Blank Subframes. Measurement subframe allocation bitmaps may indicate measurement subframes. A first measurement subframe allocation bitmap may exclude subframes indicated by the subframe allocation bitmap. A second measurement subframe allocation bitmap may exclude the measurement subframes indicated by of the first measurement subframe allocation bitmap.
1. A non-transitory computer-readable medium storing instructions that, when executed, configure a base station to:
transmit 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 frame in a plurality of frames;
transmit, to a wireless device, a first measurement subframe allocation bitmap indicating a first plurality of measurement subframes, of a primary carrier, that are not the plurality of Almost Blank Subframes;
transmit, to the wireless device, a second measurement subframe allocation bitmap indicating a second plurality of measurement subframes, of the primary carrier, different from the first plurality of measurement subframes; and
transmit a first Almost Blank Subframe at a power level that is lower than during a subframe that is not an Almost Blank Subframe.
2. The non-transitory computer-readable medium of claim 1 , wherein the first Almost Blank Subframe consists essentially of a common reference signal in a control region.
3. The non-transitory computer-readable medium of claim 1 , wherein the second measurement subframe allocation bitmap excludes the plurality of Almost Blank Subframes.
4. The non-transitory computer-readable medium of claim 1 , wherein the instructions, when executed, further configure the base station to periodically receive, from the wireless device, channel state information for one or both of:
one or more subframes indicated in the first measurement subframe allocation bitmap; or
one or more subframes indicated in the second measurement subframe allocation bitmap.
5. A non-transitory computer-readable medium storing instructions that, when executed, configure a base station to:
transmit a first message comprising a subframe allocation bitmap indicating a plurality of Almost Blank Subframes, wherein the plurality of Almost Blank Subframes consists of third and eighth subframes of each frame in a plurality of frames;
transmit, to a wireless device, a first measurement subframe allocation bitmap indicating a first plurality of measurement subframes, of a primary carrier, that are not the plurality of Almost Blank Subframes;
transmit, to the wireless device, a second measurement subframe allocation bitmap indicating a second plurality of measurement subframes, of the primary carrier, different from the first plurality of measurement subframes; and
transmit a first Almost Blank Subframe at a power level that is lower than during a subframe that is not an Almost Blank Subframe.
6. The non-transitory computer-readable medium of claim 5 , wherein the first Almost Blank Subframe consists essentially of a common reference signal in a control region.
7. The non-transitory computer-readable medium of claim 5 , wherein the second measurement subframe allocation bitmap excludes the plurality of Almost Blank Subframes.
8. The non-transitory computer-readable medium of claim 5 , wherein the instructions, when executed, further configure the base station to periodically receive, from the wireless device, channel state information for one or both of:
one or more subframes indicated in the first measurement subframe allocation bitmap; or
one or more subframes indicated in the second measurement subframe allocation bitmap.
9. A non-transitory computer-readable medium storing instructions that, when executed, configure a base station to:
transmit 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, and eighth subframes of each frame in a plurality of frames;
transmit, to a wireless device, a first measurement subframe allocation bitmap indicating a first plurality of measurement subframes, of a primary carrier, that are not the plurality of Almost Blank Subframes;
transmit, to the wireless device, a second measurement subframe allocation bitmap indicating a second plurality of measurement subframes, of the primary carrier, different from the first plurality of measurement subframes; and
transmit a first Almost Blank Subframe at a power level that is lower than during a subframe that is not an Almost Blank Subframe.
10. The non-transitory computer-readable medium of claim 9 , wherein the instructions, when executed, further configure the base station to:
transmit, based on a decrease in traffic load by an amount greater than a first value, a third message comprising a second subframe allocation bitmap indicating a second plurality of Almost Blank Subframes, wherein the second plurality of Almost Blank Subframes consists of second, fourth, seventh, and ninth subframes of each frame in a second plurality of frames; or
transmit, based on an increase in traffic load by an amount greater than a first value, a third message comprising a second subframe allocation bitmap indicating a second plurality of Almost Blank Subframes, wherein the second plurality of Almost Blank Subframes consists of third and eighth subframes of each frame in a second plurality of frames.
11. The non-transitory computer-readable medium of claim 9 , wherein the first Almost Blank Subframe consists essentially of a common reference signal in a control region.
12. The non-transitory computer-readable medium of claim 9 , wherein the second measurement subframe allocation bitmap excludes the plurality of Almost Blank Subframes.
13. The non-transitory computer-readable medium of claim 9 , wherein the instructions, when executed, further configure the base station to periodically receive, from the wireless device, channel state information for:
one or more subframes indicated in the first measurement subframe allocation bitmap; or
one or more subframes indicated in the second measurement subframe allocation bitmap.
14. A non-transitory computer-readable medium storing instructions that, when executed, configure a base station to:
transmit a first message comprising a subframe allocation bitmap indicating a plurality of Almost Blank Subframes, wherein the plurality of Almost Blank Subframes consists of third, seventh, and ninth subframes of each frame in a plurality of frames;
transmit, to a wireless device, a first measurement subframe allocation bitmap indicating a first plurality of measurement subframes, of a primary carrier, that are not the plurality of Almost Blank Subframes;
transmit, to the wireless device, a second measurement subframe allocation bitmap indicating a second plurality of measurement subframes, of the primary carrier, different from the first plurality of measurement subframes; and
transmit a first Almost Blank Subframe at a power level that is lower than during a subframe that is not an Almost Blank Subframe.
15. The non-transitory computer-readable medium of claim 14 , wherein the instructions, when executed, further configure the base station to:
transmit, based on a decrease in traffic load by an amount greater than a first value, a third message comprising a second subframe allocation bitmap indicating a second plurality of Almost Blank Subframes, wherein the second plurality of Almost Blank Subframes consists of second, fourth, seventh, and ninth subframes of each frame in a second plurality of frames; or
transmit, based on an increase in traffic load by an amount greater than a first value, a third message comprising a second subframe allocation bitmap indicating a second plurality of Almost Blank Subframes, wherein the second plurality of Almost Blank Subframes consists of third and eighth subframes of each frame in a second plurality of frames.
16. The non-transitory computer-readable medium of claim 14 , wherein the first Almost Blank Subframe consists essentially of a common reference signal in a control region.
17. The non-transitory computer-readable medium of claim 14 , wherein the second measurement subframe allocation bitmap excludes the plurality of Almost Blank Subframes.
18. The non-transitory computer-readable medium of claim 14 , wherein the instructions, when executed, further configure the base station to periodically receive, from the wireless device, channel state information for:
one or more subframes indicated in the first measurement subframe allocation bitmap; or
one or more subframes indicated in the second measurement subframe allocation bitmap.
19. A system comprising:
a base station; and
a wireless device;
wherein the base station is configured to:
transmit 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 frame in a plurality of frames;
transmit, to the wireless device, a first measurement subframe allocation bitmap indicating a first plurality of measurement subframes, of a primary carrier, that are not the plurality of Almost Blank Subframes;
transmit, to the wireless device, a second measurement subframe allocation bitmap indicating a second plurality of measurement subframes, of the primary carrier, different from the first plurality of measurement subframes; and
transmit a first Almost Blank Subframe at a power level that is lower than during a subframe that is not an Almost Blank Subframe; and
wherein the wireless device is configured to:
receive the first measurement subframe allocation bitmap; and
receive the second measurement subframe allocation bitmap.
20. The system of claim 19 , wherein the first Almost Blank Subframe consists essentially of a common reference signal in a control region.
21. The system of claim 19 , wherein the second measurement subframe allocation bitmap excludes the plurality of Almost Blank Subframes.
22. The system of claim 19 , wherein the wireless device is further configured to periodically transmit, to the base station, channel state information for:
one or more subframes indicated in the first measurement subframe allocation bitmap; or
one or more subframes indicated in the second measurement subframe allocation bitmap.
23. A system comprising:
a base station; and
a wireless device;
wherein the base station is configured to:
transmit a first message comprising a subframe allocation bitmap indicating a plurality of Almost Blank Subframes, wherein the plurality of Almost Blank Subframes consists of third and eighth subframes of each frame in a plurality of frames;
transmit, to the wireless device, a first measurement subframe allocation bitmap indicating a first plurality of measurement subframes, of a primary carrier, that are not the plurality of Almost Blank Subframes;
transmit, to the wireless device, a second measurement subframe allocation bitmap indicating a second plurality of measurement subframes, of the primary carrier, different from the first plurality of measurement subframes; and
transmit a first Almost Blank Subframe at a power level that is lower than during a subframe that is not an Almost Blank Subframe; and
wherein the wireless device is configured to:
receive, the first measurement subframe allocation bitmap; and
receive, the second measurement subframe allocation bitmap.
24. The system of claim 23 , wherein the first Almost Blank Subframe consists essentially of a common reference signal in a control region.
25. The system of claim 23 , wherein the second measurement subframe allocation bitmap excludes the plurality of Almost Blank Subframes.
26. The system of claim 23 , wherein the wireless device is further configured to periodically transmit, to the base station, channel state information for:
one or more subframes indicated in the first measurement subframe allocation bitmap; or
one or more subframes indicated in the second measurement subframe allocation bitmap.
27. A system comprising:
a base station; and
a wireless device;
wherein the base station is configured to:
transmit 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, and eighth subframes of each frame in a plurality of frames;
transmit, to the wireless device, a first measurement subframe allocation bitmap indicating a first plurality of measurement subframes, of a primary carrier, that are not the plurality of Almost Blank Subframes;
transmit, to the wireless device, a second measurement subframe allocation bitmap indicating a second plurality of measurement subframes, of the primary carrier, different from the first plurality of measurement subframes; and
transmit a first Almost Blank Subframe at a power level that is lower than during a subframe that is not an Almost Blank Subframe; and
wherein the wireless device is configured to:
receive, the first measurement subframe allocation bitmap; and
receive, the second measurement subframe allocation bitmap.
28. The system of claim 27 , wherein the base station is further configured to:
transmit, based on a decrease in traffic load by an amount greater than a first value, a third message comprising a second subframe allocation bitmap indicating a second plurality of Almost Blank Subframes, wherein the second plurality of Almost Blank Subframes consists of second, fourth, seventh, and ninth subframes of each frame in a second plurality of frames; or
transmit, based on an increase in traffic load by an amount greater than a first value, a third message comprising a second subframe allocation bitmap indicating a second plurality of Almost Blank Subframes, wherein the second plurality of Almost Blank Subframes consists of third and eighth subframes of each frame in a second plurality of frames.
29. The system of claim 27 , wherein the first Almost Blank Subframe consists essentially of a common reference signal in a control region.
30. The system of claim 27 , wherein the second measurement subframe allocation bitmap excludes the plurality of Almost Blank Subframes.
31. The system of claim 27 , wherein the wireless device is further configured to periodically transmit, to the base station, channel state information for:
one or more subframes indicated in the first measurement subframe allocation bitmap; or
one or more subframes indicated in the second measurement subframe allocation bitmap.
32. A system comprising:
a base station; and
a wireless device;
wherein the base station is configured to:
transmit, a first message comprising a subframe allocation bitmap indicating a plurality of Almost Blank Subframes, wherein the plurality of Almost Blank Subframes consists of third, seventh, and ninth subframes of each frame in a plurality of frames;
transmit, to the wireless device, a first measurement subframe allocation bitmap indicating a first plurality of measurement subframes, of a primary carrier, that are not the plurality of Almost Blank Subframes;
transmit, to the wireless device, a second measurement subframe allocation bitmap indicating a second plurality of measurement subframes, of the primary carrier, different from the first plurality of measurement subframes; and
transmit, a first Almost Blank Subframe at a power level that is lower than during a subframe that is not an Almost Blank Subframe; and
wherein the wireless device is configured to:
receive, the first measurement subframe allocation bitmap; and
receive, the second measurement subframe allocation bitmap.
33. The system of claim 32 , wherein the base station is further configured to:
transmit, based on a decrease in traffic load by an amount greater than a first value, a third message comprising a second subframe allocation bitmap indicating a second plurality of Almost Blank Subframes, wherein the second plurality of Almost Blank Subframes consists of second, fourth, seventh, and ninth subframes of each frame in a second plurality of frames; or
transmit, based on an increase in traffic load by an amount greater than a first value, a third message comprising a second subframe allocation bitmap indicating a second plurality of Almost Blank Subframes, wherein the second plurality of Almost Blank Subframes consists of third and eighth subframes of each frame in a second plurality of frames.
34. The system of claim 32 , wherein the first Almost Blank Subframe consists essentially of a common reference signal in a control region.
35. The system of claim 32 , wherein the second measurement subframe allocation bitmap excludes the plurality of Almost Blank Subframes.
36. The system of claim 32 , wherein the wireless device is further configured to periodically transmit, to the base station, channel state information for:
one or more subframes indicated in the first measurement subframe allocation bitmap; or
one or more subframes indicated in the second measurement subframe allocation bitmap.