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Systems and methods for closed-loop and open-loop wireless communications

  • US 8,934,850 B1
  • Filed: 02/04/2008
  • Issued: 01/13/2015
  • Est. Priority Date: 02/02/2007
  • Status: Active Grant
First Claim
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1. A base station comprising:

  • at least one antenna; and

    transceiver circuitry configured to perform operations including;

    determining, at the base station, receive conditions based on receiving;

    a first radio frequency signal from a communications terminal, the communications terminal configured as user equipment, the first radio signal received from a first of a plurality of antennas of the communications terminal; and

    a second radio frequency signal from the communications terminal, the second radio signal received from a second of the plurality of antennas of the communications terminal;

    selecting, at the base station, one of a closed-loop mode or an open-loop mode based on the receive conditions associated with the first radio frequency signal and the second radio frequency signal;

    transmitting, from the base station, first information identifying selection of one of the closed-loop mode or the open-loop mode for receipt by the communications terminal, the first information effective to enable the communications terminal to operate in the selected closed-loop mode or the selected open-loop mode;

    selecting, responsive to selection of the closed-loop mode and based on the receive conditions, at least one antenna of the plurality of antennas for the communications terminal to use for transmitting subsequent radio frequency signals to the base station; and

    transmitting, responsive to selection of the closed-loop mode and from the base station, second information for receipt by the communications terminal that identifies the at least one antenna of the plurality of antennas the communications terminal is to use for transmitting the subsequent radio frequency signals to the base station, the second information being provided via at least one of one or more alternative bit definitions of a control channel field that is used to indicate selection of a modulation coding set to the communications terminal, the one or more alternative bit definitions being made available by representing a modulation coding set level as an offset, the one or more alternative bit definitions assigned as one or more antenna selection bits.

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