Method and apparatus for allocating downlink resources in a multiple-input multiple-output (MIMO) communication system

Abstract

Techniques to schedule downlink data transmission to a number of terminals in a wireless communication system. In one method one or more sets of terminals are formed for possible data transmission with each set including a unique combination of one or more terminals and corresponding to a hypothesis to be evaluated. One or more sub-hypotheses may further be formed for each hypothesis with each sub-hypothesis corresponding to specific assignments of a number of transmit antennas to the one or more terminals in the hypothesis. The performance of each sub-hypothesis is then evaluated and one of the evaluated sub-hypotheses is selected based on their performance. The terminal(s) in the selected sub-hypothesis are then scheduled for data transmission and data is thereafter coded modulated and transmitted to each scheduled terminal from one or more transmit antennas assigned to the terminal.

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Publication No	Technology	Declaration Information			Specification Information				Explicitly Disclosed	Patent Type	Status	National Phase Entries
Publication No	Technology	Declaration Date	Declaration Reference	Declaring Company	Specification Information				Explicitly Disclosed	Patent Type	Status	National Phase Entries
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Technologies

Scheduling

Product

Not Available

Use Cases

Wireless communication

Services

Not Available

Claim

1. A method of transmitting data in a wireless communication system, comprising:
identifying a plurality of sets of terminals, each set including at least one terminal to be evaluated for simultaneously receiving at least one data stream from multiple transmit antennas;
identifying a plurality of potential combinations of antenna/terminal assignments, wherein each potential combination of antenna/terminal assignments comprises an assignment of the multiple transmit antennas to a particular set of terminals;
evaluating performance of each potential combination of antenna/terminal assignments; and
selecting one of the plurality of potential combinations of antenna/terminal assignments for data transmission based on the evaluated performance of each potential combination of antenna/terminal assignments.', 'identifying a plurality of sets of terminals, each set including at least one terminal to be evaluated for simultaneously receiving at least one data stream from multiple transmit antennas;', 'identifying a plurality of potential combinations of antenna/terminal assignments, wherein each potential combination of antenna/terminal assignments comprises an assignment of the multiple transmit antennas to a particular set of terminals;', 'evaluating performance of each potential combination of antenna/terminal assignments; and', 'selecting one of the plurality of potential combinations of antenna/terminal assignments for data transmission based on the evaluated performance of each potential combination of antenna/terminal assignments.

2. The method of claim 1, wherein evaluating the performance of a particular potential combination of antenna/terminal assignments comprises:
determining a performance metric for the corresponding set of terminals based on data streams assigned to the at least one terminal in the set.', 'determining a performance metric for the corresponding set of terminals based on data streams assigned to the at least one terminal in the set.

3. The method of claim 2, wherein selecting one of the plurality of potential combinations of antenna/terminal assignments comprises:
selecting the set of terminals with the best performance metric for data transmission from the multiple transmit antennas.', 'selecting the set of terminals with the best performance metric for data transmission from the multiple transmit antennas.

4. The method of claim 1, wherein evaluating the performance of a particular potential combination of antenna/terminal assignments comprises:
assigning the at least one terminal in the corresponding set of terminals with multiple data streams from the multiple transmit antennas; and
determining a performance metric for the set based on the multiple data streams assigned to the at least one terminal in the set.', 'assigning the at least one terminal in the corresponding set of terminals with multiple data streams from the multiple transmit antennas; and', 'determining a performance metric for the set based on the multiple data streams assigned to the at least one terminal in the set.

5. The method of claim 1, wherein evaluating the performance of a particular potential combination of antenna/terminal assignments comprises:
assigning each of the multiple transmit antennas to a terminal in the corresponding set of terminals that achieves the best performance for the transmit antennas; and
determining the performance of the set of terminals based on the transmit antennas assigned to that terminal.', 'assigning each of the multiple transmit antennas to a terminal in the corresponding set of terminals that achieves the best performance for the transmit antennas; and', 'determining the performance of the set of terminals based on the transmit antennas assigned to that terminal.

6. The method of claim 1, wherein the evaluating the performance of a particular potential combination of antenna/terminal assignments comprises:
evaluating the performance of the corresponding set of terminals based on channel state information (C SI) for each terminal in the set.', 'evaluating the performance of the corresponding set of terminals based on channel state information (C SI) for each terminal in the set.

7. The method of claim 6, wherein the CSI for each terminal comprises signal-to-noise-plus-interference ratio (SNR) estimates for the multiple transmit antennas.

8. The method of claim 1, wherein the plurality of sets of terminals comprise a set of multiple single-input multiple-output (SIMO) terminals.

9. The method of claim 1, wherein the plurality of sets of terminals comprise a set of a single multiple-input multiple-output (MIMO) terminal

10. The method of claim 1, wherein the plurality of sets of terminals comprise:
a set of at least one multiple-input multiple-output (MIMO) terminal; and
at least one single-input multiple-output (SIMO) terminal.', 'a set of at least one multiple-input multiple-output (MIMO) terminal; and', 'at least one single-input multiple-output (SIMO) terminal

11. The method of claim 1, further comprising
prioritizing terminals to be considered for data transmission.', 'prioritizing terminals to be considered for data transmission

12. The method of claim 11, wherein the identifying the plurality of sets of terminals comprises:
identifying a single set of terminals based on the priority of the terminals to be considered for data transmission.', 'identifying a single set of terminals based on the priority of the terminals to be considered for data transmission

13. The method of claim 1, wherein the multiple transmit antennas are formed with at least one beam-forming matrix

14. An apparatus comprising:
means for identifying a plurality of sets of terminals, each set including at least one terminal to be evaluated for simultaneously receiving at least one data stream from multiple transmit antennas;
means for identifying a plurality of potential combinations of antenna/terminal assignments, wherein each potential combination of antenna/terminal assignments comprises an assignment of the multiple transmit antennas to a particular set of terminals;
means for evaluating performance of each potential combination of antenna/terminal assignments; and
means for selecting one of the plurality of potential combinations of antenna/terminal assignments for data transmission based on the evaluated performance of each potential combination of antenna/terminal assignments.', 'means for identifying a plurality of sets of terminals, each set including at least one terminal to be evaluated for simultaneously receiving at least one data stream from multiple transmit antennas;', 'means for identifying a plurality of potential combinations of antenna/terminal assignments, wherein each potential combination of antenna/terminal assignments comprises an assignment of the multiple transmit antennas to a particular set of terminals;', 'means for evaluating performance of each potential combination of antenna/terminal assignments; and', 'means for selecting one of the plurality of potential combinations of antenna/terminal assignments for data transmission based on the evaluated performance of each potential combination of antenna/terminal assignments

15. The apparatus of claim 14, wherein the means for evaluating the performance of a particular potential combination of antenna/terminal assignments comprises:
means for determining a performance metric for the corresponding set of terminals based on data streams assigned to the at least one terminal in the set.', 'means for determining a performance metric for the corresponding set of terminals based on data streams assigned to the at least one terminal in the set

16. The apparatus of claim 14, wherein the means for evaluating the performance of a particular potential combination of antenna/terminal assignments comprises:
means for assigning the at least one terminal in the corresponding set of terminals with multiple data streams from the multiple transmit antennas; and
means for determining a performance metric for the set based on the multiple data streams assigned to the at least one terminal in the set.', 'means for assigning the at least one terminal in the corresponding set of terminals with multiple data streams from the multiple transmit antennas; and', 'means for determining a performance metric for the set based on the multiple data streams assigned to the at least one terminal in the set.17. An apparatus comprising:
at least one processor configured to identify a plurality of sets of terminals, each set including at least one terminal to be evaluated for simultaneously receiving at least one data stream from multiple transmit antennas, to identify a plurality of potential combinations of antenna/terminal assignments, wherein each potential combination of antenna/terminal assignments comprises an assignment of the multiple transmit antennas to a particular set of terminals, to evaluate performance of each potential combination of antenna/terminal assignments, and to select one of the plurality of potential combinations of antenna/terminal assignments for data transmission based on the evaluated performance of each potential combination of antenna/terminal assignments; and
a memory coupled to the at least one processor.', 'at least one processor configured to identify a plurality of sets of terminals, each set including at least one terminal to be evaluated for simultaneously receiving at least one data stream from multiple transmit antennas, to identify a plurality of potential combinations of antenna/terminal assignments, wherein each potential combination of antenna/terminal assignments comprises an assignment of the multiple transmit antennas to a particular set of terminals, to evaluate performance of each potential combination of antenna/terminal assignments, and to select one of the plurality of potential combinations of antenna/terminal assignments for data transmission based on the evaluated performance of each potential combination of antenna/terminal assignments; and', 'a memory coupled to the at least one processor.18. The apparatus of claim 17, wherein the at least one processor is configured to determine a performance metric for a set of terminals corresponding to a particular potential combination of antenna/terminal assignments based on data streams assigned to the at least one terminal in the set.19. The apparatus of claim 17, wherein the at least one processor is configured to assign the at least one terminal in a set of terminals corresponding to a particular potential combination of antenna/terminal assignments with multiple data streams from the multiple transmit antennas, and to determine a performance metric for the set based on the multiple data streams assigned to the at least one terminal in the set.

20. A non-transitory computer-readable medium comprising instructions executable to:
identify a plurality of sets of terminals, each set including at least one terminal to be evaluated for simultaneously receiving at least one data stream from multiple transmit antennas;
identify a plurality of potential combinations of antenna/terminal assignments, wherein each potential combination of antenna/terminal assignments comprises an assignment of the multiple transmit antennas to a particular set of terminals;
evaluate performance of each potential combination of antenna/terminal assignments; and
select one of the plurality of potential combinations of antenna/terminal assignments for data transmission based on the evaluated performance of each potential combination of antenna/terminal assignments.', 'identify a plurality of sets of terminals, each set including at least one terminal to be evaluated for simultaneously receiving at least one data stream from multiple transmit antennas;', 'identify a plurality of potential combinations of antenna/terminal assignments, wherein each potential combination of antenna/terminal assignments comprises an assignment of the multiple transmit antennas to a particular set of terminals;', 'evaluate performance of each potential combination of antenna/terminal assignments; and', 'select one of the plurality of potential combinations of antenna/terminal assignments for data transmission based on the evaluated performance of each potential combination of antenna/terminal assignments.']

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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.

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