Abstract
Embodiments of methods and apparatus for providing downlink channel parameters determination for downlink channels associated with a multiple-input-multiple-output (MIMO) system are generally described herein. Other embodiments may be described and claimed.
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Technologies
Feedback
Product
Use Cases
Services
Claim
1. An apparatus to be employed in an eNodeB (eNB), the apparatus comprising:
a transmitter to transmit, on one or more downlink channels of a number of downlink channels, a downlink signal to a subscriber station using downlink parameters that are determined based on received uplink channel quality information; and
a receiver coupled with the transmitter, the receiver to receive, from the subscriber station, an uplink message including feedback information corresponding to the downlink signal, wherein the feedback information is only for a subset of channels of the number of downlink channels, and wherein the number of the subset of channels is less than the number of downlink channels.
2. The apparatus of claim 1, wherein the subset of channels is a subset of relatively stronger channels of the number of downlink channels.
3. The apparatus of claim 1, wherein the uplink channel quality information is based on channel quality of uplink spatial channels and/or data streams.
4. The apparatus of claim 3, wherein the uplink channel quality information includes a mean or a variance of channel quality for each of the spatial channels and/or data streams.
5. The apparatus of claim 3, wherein the uplink channel quality information includes an estimated signal to noise plus interference ratio (SINR).
6. The apparatus of claim 1, wherein the determined downlink channel parameters include a number of data streams, a modulation/coding scheme, bit loading, or power loading for the data streams.
7. The apparatus of claim 1, wherein the feedback information comprises a beamforming matrix or signal to noise plus interference ratio (SINR).
8. The apparatus of claim 1, wherein the transmitter is further to transmit an instruction to the subscriber station to feedback the information only for the subset of the estimated usable channels.
9. The apparatus of claim 1, wherein the transmitter and the receiver are part of a transceiver having at least one common component, and the apparatus is a chipset.
10. One or more non-transitory computer readable media comprising instructions configured to cause an eNB, upon execution of the instructions by one or more processors of the base station, to:
identify one or more downlink channels of a number of downlink channels based on received uplink channel quality information of an uplink channel of the eNB;
identify a subscriber station from a plurality of subscriber stations based on downlink parameters that are determined based on the received uplink channel quality information;
transmit a signal to the subscriber station identified using the downlink parameters; and
receive, from the subscriber station, an uplink message including feedback information related to the signal only for a subset of channels of the number of downlink channels.
11. The one or more non-transitory computer readable media of claim 10, wherein the uplink channel quality information is based on channel quality of uplink spatial channels and/or data streams.
12. The one or more non-transitory computer readable media of claim 11, wherein the uplink channel quality information includes a mean or variance for one or more of the spatial channels or data streams, or an estimated signal to noise plus interference ratio (SINR).
13. The one or more non-transitory computer readable media of claim 10, wherein the downlink parameters include a number of data streams, a modulation scheme, a coding scheme, or power level of the data streams and are based on the estimated SINR.
14. The one or more non-transitory computer readable media of claim 13, wherein the feedback information comprises a beamforming matrix or signal to noise plus interference ratio (SINR).
15. The one or more non-transitory computer readable media of claim 10, wherein the subset of channels is a subset of k relatively stronger channels of the number of downlink channels.
16. A subscriber station comprising:
an antenna;
a processor coupled to the antenna, the processor to:
identify, based on a downlink signal received on a downlink channel of a number of downlink channels, an indication from a base station to transmit an uplink message; and
facilitate, based on the indication, a transmission of an uplink message that includes feedback information corresponding to the downlink signal, wherein the feedback information is only for a subset of channels of the number of downlink channels, and wherein the number of the subset of channels is less than the number of downlink channels.
17. The subscriber station of claim 16, wherein the subset of channels is a subset of relatively stronger channels of the number of downlink channels.
18. The subscriber station of claim 16, wherein the processor is further to facilitate, prior to reception of the downlink signal, transmission of uplink channel quality information that is based on channel quality of uplink spatial channels and/or data streams.
19. The subscriber station of claim 18, wherein the uplink channel quality information includes a mean or a variance of channel quality for each of the spatial channels and/or data streams, or the uplink channel quality information includes an estimated signal to noise plus interference ratio (SINR).
20. The subscriber station of claim 16, further comprising a display coupled with the processor.
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Patent number:US9379875B2
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