Method for Selecting Antennas in a Wireless Networks

• US 20090042615A1
• Filed: 08/06/2007
• Published: 02/12/2009
• Est. Priority Date: 08/06/2007
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Research Laboratories, Inc. (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Electric Research Laboratories, Inc. (Mitsubishi Electric Corporation)
• Inventors: Fukui, Noriyuki, Mehta, Neelesh B., Tang, Jia, Teo, Koon Hoo
• Granted Patent: US 8,086,272 B2
• Time in Patent Office: Days
• US Class Current: 455/562.100
• CPC Class Codes: H04B 7/061 using feedback from receiving side
• CPC Class Codes: H04B 7/0691 using subgroups of transmit antennas

Abstract

A method and system selects antennas in a wireless network including a base station and user equipment (UE) transceivers. The base station specifies times and frequencies to transmit sounding reference signals (SRSs), and antennas to use to transmit the SRSs for the specified times and frequencies. The transceivers transmit the SRS according to the specified times, frequencies, and antennas. The base station selects subsets of the set of available sets of antennas, and indicates the selected subset of antennas to the transceiver.

Claims

1. A method for selecting antennas in a wireless network including a base station and a plurality of user equipment (UE) transceivers, comprising:

specifying, in a base station of a wireless network, times and frequencies to transmit sounding reference signals (SRSs) by a transceiver of the network, in which the transceiver includes a set of available antennas;

specifying which antennas to use to transmit the SRSs for the specified times and frequencies;

transmitting the SRS by the transceiver according to the specified times, frequencies, and antennas;

selecting a subset of antennas of the set of available antennas in the base station based on the received SRSs; and

indicating the selected subset of antennas to the transceiver.

2. The method of claim 1, further comprising:

transmitting data by the transceiver using the selected subset of antennas.

3. The method of claim 1, further comprising:

transmitting antenna selection capability information from a transceiver to the base station;

confirming the antenna selection capability information from the base station to the transceiver;

transmitting a set of antenna selection parameters from the base station to transceiver;

transmitting an antenna selection request from the base station to the transceiver; and

transmitting an antenna selection decision from the base station to the transceiver.

4. The method of claim 3, further comprising:

combining the antenna selection parameters with the antenna selection request.

5. The method of claim 1, further comprising:

combining the antenna selection with the antenna selection decision.

6. The method of claim 1, in which the antenna selection is performed periodically.

7. The method of claim 1, further comprising:

performing the antenna selection adaptively.

8. The method of claim 1, further comprising:

performing the antenna selection based on non-hopping sounding reference signals.

9. The method of claim 1, further comprising:

performing the antenna selection based on hopping sounding reference signals.

10. The method of claim 1, further comprising:

performing the antenna selection based on wideband sounding reference signal.

11. The method of claim 1, further comprising:

performing the antenna selection based on variable bandwidth sounding reference signal.

12. The method of claim 1, further comprising:

performing the antenna selection based on narrow-band sounding reference signal.

13. The method of claim 1, further comprising:

switching between periodic antenna selection and adaptive antenna selection.

14. The method of claim 1, further comprising:

performing the antenna selection based on a relative antenna index.

15. The method of claim 1, further comprising:

performing the antenna selection based on an absolute antenna index.

16. The method of claim 1, further comprising:

performing the antenna selection for retransmission packets based on asynchronous HARQ protocol.

17. The method of claim 1, further comprising:

performing the antenna selection for retransmission packets based on synchronous HARQ protocol.

18. The method of claim 3, in which the antenna selection parameters include transmission bandwidth, starting or ending bandwidth position, transmission period, cyclic shift hopping sequence, transmission sub-frame, repetition factor for indicating a density of a pilot subcarriers, a duration of the SRS transmission, symbol position of the SRS within a sub-frame, and hopping SRS related parameters.

19. The method of claim 1, further comprising:

specifying, in the base station the times and the frequencies to transmit data demodulation reference signals by the transceiver;

specifying which antennas to use to transmit the data demodulation reference signals for the specified times and frequencies;

transmitting the data demodulation reference signals by the transceiver according to the specified times, frequencies, and antennas; and

selecting the subset of antennas of the set of available antennas in the base station based on the received data demodulation reference signals.

20. The method of claim 1, in which the wireless network is an OFDM network.

21. The method of claim 1, in which the wireless network is an OFDMA network.

22. The method of claim 1, in which the wireless network is an SC-FDMA network.

23. (canceled)

24. A system for selecting antennas in a wireless network including a base station and a plurality of user equipment (UE) transceivers, comprising:

a base station of a wireless network, the base station configured to specify times and frequencies to transmit sounding reference signals (SRSs), and further comprising means for specifying which antennas to use to transmit the SRSs for the specified times and frequencies;

a transceiver including a set of available antennas, the base station configured to transmit the SRSs according to the specified times, frequencies, and antennas;

means selecting a subset of antennas of the set of available based on the received SRSs; and

means for indicating the selected subset of antennas to the transceiver.