System and method for supporting multiple reverse link data streams

• US 8,654,705 B2
• Filed: 04/05/2010
• Issued: 02/18/2014
• Est. Priority Date: 10/24/2008
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Wang, Jibing, Kadous, Tamer, Attar, Rashid Ahmed Akbar
• Primary Examiner(s): Yao, Kwang B
• Assistant Examiner(s): Bokhari, Syed M
• Application Number:
  US12/754,018
• Publication Number:
  US 20100291917A1
• Time in Patent Office: 1,415 Days
• Field of Search: 370/318, 370/338, 370/331, 370/208, 370/334, 370/473, 370/312, 370328-329, 455/101, 455/522, 455/562.1, 375/299, 375/260
• US Class Current: 370/328
• CPC Class Codes: H04B 7/0613 using simultaneous transmission H04B7/0686 takes precedence
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0619 using feedback from receiving side feedback signaling for adaptive modulation/coding H04L1/0001
• CPC Class Codes: H04B 7/0634 Antenna weights or vector/matrix coefficients
• CPC Class Codes: H04B 7/0691 using subgroups of transmit antennas
• CPC Class Codes: H04B 7/0695 using beam selection
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity

Abstract

Techniques for rank adaptation and multiple-stream reverse link communications in a wireless access network are disclosed. A remote unit transmits one or more reverse link data streams using separate identifiers to a base station. The number of reverse link data streams may be determined according to feedback from the base station or it may be determined by testing one or more multiple-antenna transmit hypotheses. The base station may estimate channel conditions using information obtained from the one or more reverse link data streams and may determine a spatial rank of the communication channel. The remote unit may perform separate error control and power control processes for each reverse link data stream in cooperation with the base station.

Claims

1. A method of communicating in an Evolution Data Optimized (EV-DO) network performed by an access terminal having a plurality of antennas, the method comprising:

determining a number of reverse link data streams to transmit;

determining a selection of antennas from the plurality of antennas for transmitting the reverse link data streams;

determining beamforming parameters based at least in part on a beamforming identifier;

transmitting a first data stream comprising a first medium access control (MAC) index using the selection of antennas, the first data stream being transmitted via the selection of antennas in accordance with the beam-forming parameters; and

transmitting a second data stream comprising a second MAC index, the second data stream being transmitted in response to determining that the number of reverse link data streams is at least two, the second data stream being transmitted concurrently with the first data stream, and the second data stream being transmitted via the selection of antennas using a beam direction that is orthogonal to a beam direction of the first data stream.

2. The method of claim 1, wherein determining the number of reverse link data streams comprises receiving feedback from a base station.

3. The method of claim 1, wherein determining the number of reverse link data streams comprises testing one or more multiple-antenna hypotheses of the access terminal.

4. The method of claim 1, further comprising:

transmitting a single data stream to the EV-DO network using a pair of antennas in the plurality of antennas responsive to determining that the number of reverse link data streams is one.

5. The method of claim 1, further comprising:

receiving the beamforming identifier from the EV-DO network.

6. The method of claim 5, further comprising:

transmitting the first data stream with a first phase using a first antenna and with a second phase using a second antenna based on the beamforming information.

7. The method of claim 1, in which:

the first data stream is transmitted to the EV-DO network using first and second antennas in the plurality of antennas; and

the second data stream is transmitted with the first and second antennas.

8. The method of claim 1, further comprising:

receiving from the EV-DO network a first power control message;

receiving from the EV-DO network a second power control message;

determining a first power level for transmitting the first data stream based on the first power control message; and

determining a second power level for transmitting the second data stream based on the second power control message.

9. The method of claim 1, further comprising:

receiving from the EV-DO network a first error control message relating to the first data stream;

receiving from the EV-DO network a second error control message relating to the second data stream;

performing a first error control process for the first reverse link data stream based on the first error control message; and

performing a second error control process for the second reverse link data stream based on the second error control message.

10. The method of claim 1, wherein the first data stream comprises a first pilot signal and a second pilot signal orthogonal to the first pilot signal, and wherein the second data stream is transmitted absent the second pilot signal.

11. The method of claim 1, further comprising:

transmitting the first data stream at a first data rate; and

transmitting the second data stream at a second data rate.

12. The method of claim 11, wherein the first data stream comprises a first indicator of the first data rate and the second data stream comprises a second indicator of the second data rate.

13. An Evolution Data Optimized (EV-DO)-enabled access terminal, the access terminal comprising:

a plurality of antennas;

a plurality of transceivers, wherein each transceiver is coupled to a corresponding antenna in the plurality of antennas; and

a controller coupled to the transceivers and configured;

to determine beamforming parameters based at least in part on a beamforming identifier;

to determine a number of reverse link data streams to transmit,

to determine a selection of antennas from the plurality of antennas for transmitting the reverse link data streams,

to transmit a first data stream comprising a first medium access control (MAC) index, the first data stream being transmitted via the selection of antennas in accordance with the beam-forming parameters, and

to transmit a second data stream comprising a second MAC index the second data stream being transmitted in response to determining that the number of reverse link data streams is at least two, the second data stream being transmitted concurrently with the first data stream, and the second data stream being transmitted via the selection of antennas using a beam direction that is orthogonal to a beam direction of the first data stream.

14. The access terminal of claim 13, wherein the controller is configured to determine the number of reverse link data streams based on feedback from a base station.

15. The access terminal of claim 13, wherein the controller is configured to determine the number of reverse link data streams based on a result of testing one or more multiple-antenna hypotheses of the access terminal.

16. The access terminal of claim 13, wherein the first data stream comprises a first pilot and a second pilot orthogonal to the first pilot.

17. The access terminal of claim 13, wherein the controller is configured to receive the beamforming identifier from the EV-DO network.

18. The access terminal of claim 13, wherein the controller is configured to detect in transmissions from the EV-DO network a first power control message and a second power control message, and to determine a power level for transmitting the first data stream based on the first power control message and a power level for transmitting the second data stream based on the second power control message.

19. The access terminal of claim 13, wherein the controller is configured to detect in a forward link signal a first error control message relating to the first data stream and a second error control message relating to the second stream, and to perform a first error control process for the first data stream based on the first error control message, and a second error control process for the second data stream based on the second error control message.

20. An Evolution Data Optimized (EV-DO)-enabled access terminal, comprising:

means for determining a number of reverse link data streams to transmit;

means for determining a selection of antennas from a plurality of antennas for transmitting the reverse link data streams;

means for determining beamforming parameters based at least in part on a beamforming identifier;

means for transmitting a first data stream comprising a first medium access control (MAC) index, the first data stream being transmitted via the selection of antennas in accordance with the beam-forming parameters; and

means for transmitting a second data stream comprising a second MAC index, the second data stream being transmitted in response to determining that the number of reverse link data streams is at least two, the second data stream being transmitted concurrently with the first data stream, and the second data stream being transmitted via the selection of antennas using a beam direction that is orthogonal to a beam direction of the first data stream.

21. The access terminal of claim 20, wherein the means for determining the number of reverse link data streams to transmit comprise means for receiving feedback from a base station.

22. The access terminal of claim 20, wherein the means for determining the number of reverse link data streams to transmit comprise means for testing one or more multiple-antenna hypotheses of the access terminal.

23. The access terminal of claim 20, further comprising:

means for transmitting a single data stream to the EV-DO network using a pair of antennas selected from the plurality of antennas in response to the number of reverse link data streams being one.

24. The access terminal of claim 20, further comprising:

means for receiving the beamforming identifier from the EV-DO network.

25. The access terminal of claim 20, in which:

the first data stream is transmitted to the EV-DO network using first and second antennas in the plurality of antennas; and

the second data stream is transmitted with the first and second antennas.

26. The access terminal of claim 20, further comprising:

means for receiving a first power control message;

means for receiving a second power control message;

means for determining a power level for transmitting the first data stream based on the first power control message; and

means for determining a power level for transmitting the second data stream based on the second power control message.

27. The access terminal of claim 20, further comprising:

means for receiving a first error control message relating to the first data stream;

means for receiving a second error control message relating to the second data stream;

means for performing a first error control process for the first data stream based on the first error control message; and

means for performing a second error control process for the second data stream based on the second error control message.

28. The access terminal of claim 20, further comprising:

means for transmitting the first data stream at a first data rate; and

means for transmitting the second data stream at a second data rate.

29. A computer program product comprising:

a processor-readable medium storing non-transitory processor-readable instructions for use with an access terminal in an Evolution Data Optimized (EV-DO) network, wherein the instructions are configured to cause a processor to;

determine a number of reverse link data streams to transmit;

determine a selection of antennas from a plurality of antennas for transmitting the reverse link data streams;

determine beamforming parameters based at least in part on a beamforming identifier;

transmit a first data stream comprising a first medium access control (MAC) index, the first data stream being transmitted via the selection of antennas in accordance with the beam-forming parameters; and

transmit a second data stream comprising a second MAC index, the second data stream being transmitted in response to determining that the number of reverse link data streams is at least two, the second data stream being transmitted concurrently with the first data stream, and the second data stream being transmitted via the selection of antennas using a beam direction that is orthogonal to a beam direction of the first data stream.

30. The computer program product of claim 29, wherein the instructions are configured to determine the number of reverse link data streams to transmit based on feedback from a base station.

31. The computer program product of claim 29, wherein the instructions are configured to determine the number of reverse link data streams to transmit based on a result of testing one or more multiple-antenna hypotheses of the access terminal.

32. The computer program product of claim 29, wherein the instructions are configured to cause the processor to transmit a single data stream to the EV-DO network using a pair of antennas selected from the plurality of antennas in response to the number of reverse link data streams being one.

33. The computer program product of claim 29, wherein the instructions are configured to cause the processor to receive the beamforming identifier.

34. The computer program product of claim 29, wherein the instructions are configured to cause the processor to:

transmit the first data stream to the EV-DO network using first and second antennas; and

transmit the second data stream with the first and second antennas.

35. The computer program product of claim 29, wherein the instructions are configured to cause the processor to:

receive first power control information;

receive second power control information;

determine a first power level for transmitting the first data stream based on the first power control information; and

determine a second power level for transmitting the second data stream based on the second power control information.