MU-MIMO-OFDMA SYSTEMS AND METHODS FOR MULTI-RANK CQI COMPUTATION AND PRECODER SELECTION
First Claim
1. A method for determining attributes of communication channels of multi-user (MU)-multiple input multiple output (MIMO) users in an orthogonal frequency division multiplexing based multiple access (OFDMA) system, the method comprising:
- receiving from a base station, for at least one sub-band of contiguous sub-carriers, an indication of an estimate of or an upper-bound on a total number of streams (S) that are co-scheduled by the base station on the at least one sub-band;
determining one or more signal quality measures for the at-least one sub-band based on the estimate of or the upper-bound on the total number of streams that are scheduled by the base station on the at least one sub-band; and
transmitting to the base station an indication of the one or more signal quality measures.
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Accused Products
Abstract
Methods and systems for determining attributes of communication channels of MU-MIMO users in an OFDMA system are disclosed. One method comprises receiving from a base station, for at least one sub-band of contiguous sub-carriers, an indication of an estimate of or an upper-bound on a total number of streams that are co-scheduled by the base station on the at least one sub-band. In addition, the method further comprises determining one or more signal quality measures for the at-least one sub-band based on the estimate of or the upper-bound on the total number of streams that are scheduled by the base station on the at least one sub-band. Moreover, an indication of the one or more signal quality measures is transmitted to the base station.
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Citations
20 Claims
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1. A method for determining attributes of communication channels of multi-user (MU)-multiple input multiple output (MIMO) users in an orthogonal frequency division multiplexing based multiple access (OFDMA) system, the method comprising:
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receiving from a base station, for at least one sub-band of contiguous sub-carriers, an indication of an estimate of or an upper-bound on a total number of streams (S) that are co-scheduled by the base station on the at least one sub-band; determining one or more signal quality measures for the at-least one sub-band based on the estimate of or the upper-bound on the total number of streams that are scheduled by the base station on the at least one sub-band; and transmitting to the base station an indication of the one or more signal quality measures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A receiver system for determining precoders for communication channels of multi-user (MU)-multiple input multiple output (MIMO) users in an orthogonal frequency division multiplexing based multiple access (OFDMA) system comprising:
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a receiver configured to receive from a base station, for at least one sub-band of contiguous sub-carriers, an indication of an estimate of or an upper-bound on a total number of streams that are co-scheduled by the base station on the at least one sub-band; a processor configured to determine a precoder matrix for the at-least one sub-band based on the estimate of or the upper-bound on the total number of streams that are scheduled by the base station on the at least one sub-band; and a transmitter configured to transmit to the base station an indication of the precoder matrix. - View Dependent Claims (19)
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20. A method for scheduling multi-user (MU)-multiple input multiple output (MIMO) users in an orthogonal frequency division multiplexing based multiple access (OFDMA) system comprising:
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transmitting, for at least one sub-band of contiguous sub-carriers, to each prospective user an indication of an estimate of or an upper-bound on a total number of streams that are co-scheduled by the base station on the at least one sub-band to permit the prospective users to account for potential interference resulting from transmissions to co-scheduled users; receiving from each prospective user an indication of at least one preferred precoder matrix and one or more signal quality indications that are based on the estimate of or an upper-bound on the total number of streams that are co-scheduled by the base station on the at least one sub-band; selecting a set of the prospective users and determining scheduling information for each of the selected users based on the precoder matrices and the signal quality measures; and transmitting the respective scheduling information to the selected users.
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Specification