Method for Implicit Selecting Antennas in a Wireless Networks

• US 20090042616A1
• Filed: 10/26/2007
• 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: Tang, Jia, Teo, Koon Hoo, Mehta, Neelesh B.
• Granted Patent: US 8,055,301 B2
• Time in Patent Office: Days
• US Class Current: 455/562.100
• CPC Class Codes: H04B 7/0404 the mobile station comprising multiple antennas, e.g. to provide uplink diversity
• 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 stopping and starting of the SRS are specified implicitly. 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 frequency division multiplexing wireless network, times and frequencies when to transmit sounding reference signals (SRSs) by a transceiver of the network, in which the transceiver includes a set of available antennas;

enabling and disabling a transmission of the SRSs implicitly;

transmitting the SRS by the transceiver according to the specified times, frequencies, and antennas only when the transmission is enabled;

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 transceivers.

2. The method of claim 1, further comprising:

indicating the implicit enabling and disabling in a Period1 field of a Level-B message, in which the Period1 field is zero to disable and non-zero to enable.

3. The method of claim 2, further comprising:

partitioning fields of the Level-B message into sub-messages; and

transmitting the sub-messages separately.

4. The method of claim 2, in which the fields include Symbol Position and BW &

Position, and further comprising;

specifying the Symbol Position and BW &

Position field only for the base station; and

broadcasting fields via a dynamic broadcast channel of the base station.

5. The method of claim 1, in which the selecting of the subset of antennas implicitly.

6. The method of claim 5, in which a first subset of antennas is selected for even sub-frames, and a second subset of antennas is selected for odd sub-frames.

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

7. The method of claim 7, further comprising:

broadcasting antenna selection capability information from the base station to the transceiver.