Method for selecting antennas in a wireless networks

Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail

Reexamination Certificate

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Details

C370S310000, C370S329000, C375S133000, C375S260000

Reexamination Certificate

active

08046029

ABSTRACT:
A method selects antennas in a wireless network including a base station and one or more transceivers. The base station specifies times, subcarriers and subsets of antennas to use to transmit sounding reference signals (SRS) to the base station. Then, the transceiver transmits the SRS according to the specified times and subcarriers using different subsets of the set antennas. The SRS are received in the base station, and the base station selects one of the different subset of the antennas based on the received SRS, and indicates the selected subset of the antennas to the transceiver.

REFERENCES:
patent: 2009/0054093 (2009-02-01), Kim et al.
patent: 2010/0111009 (2010-05-01), Pajukoski et al.
R1-072340, “Considerations on Sounding Reference Signal for Closed-Loop Antenna Switching in E-UTRA Uplink,” TSG-RAN WG1 #49, LG Electronics, May 7, 2007, Kobe, Japan.
R1-063089, “Low Cost Training for Transmit Antenna Selection on the Uplink,” Mitsubishi Electric, NTT DoCoMo, 3GPP RAN1#47; Nov. 6-10, 2006; Riga, Latvia.
R1-063690, “Performance Comparison of Training Schemes for Uplink Antenna Selection,” Mitsubishi Electric NTT DoCoMo, 3GPP RAN#47; Nov. 6-10, 2006; Riga Latvia.
R1-033091, Effects of the Switching Duration on the Performance of the within TTI Switching Scheme for Transmit Antenna Selection in the Uplink Mitsubishi Electric, NTT DoCoMo, 3GPP RAN1#47; Nov. 6-10, 2006; Riga, Latvia.
R1-070524, “Comparison of Closed Loop Antenna Selection with Open-Loop Transmit Diversity (Antenna Switching Between TTIs),” Mitsubishi Electric, 3GPP RAN1#47bis, Jan. 15-19, 2007, Sorrento, Italy.
R1-073067, “Adaptive Antenna Switching with Low Sounding Reference Signal Overhead,” Mitsubishi Electric, 3GPP RAN1#49bis; Jun. 25-29, 2007; Orlando, Florida.
R1-073068, “Impact of Sounding Reference Signal Loading on System-Level Performance of Adaptive Antenna Switching,” Mitsubishi Electric, 3GPP RAN1#49bis; Jun. 25-29, 2007; Orlando, Florida.
R1-070860, “Closed Loop Antenna Switching in E-UTRA uplink,” NTT DoCoMo, Institute for Infocomm Research, Mitsubishi Electric, NEC, Sharp, Toshiba Corporation, 3GPP Ran#48; St. Louis, Missouri, Feb. 12, 2007.
R1-051398, “Transmit Antenna Selection Techniques for Uplink E-UTRA,” Institute for Infocomm Research (I2R), Mitsubishi Electric, NTT DoCoMo, 3GPP RAN1#43; Nov. 7-11, 2005; Seoul, South Korea.

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