×

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

  • US 9,154,174 B1
  • Filed: 02/04/2008
  • Issued: 10/06/2015
  • Est. Priority Date: 02/02/2007
  • Status: Active Grant
First Claim
Patent Images

1. A first communications terminal comprising:

  • a plurality of antennas; and

    transceiver circuitry associated with the plurality of antennas and configured to;

    receive first information and second information from a base station via at least one message, wherein the first information indicates to the first communications terminal which of a closed-loop mode and a open-loop mode to select;

    select a mode for communications with the base station based on the first information, wherein during the closed-loop mode, at least one of the plurality of antennas for transmitting is selected based on the second information;

    provide a first communications link for transmissions from the first communications terminal to the base station using at least a first antenna of the plurality of antennas, wherein first conditions are associated with the first communications link;

    provide a second communications link for transmissions from the first communications terminal to the base station using at least a second antenna of the plurality of antennas, wherein second conditions are associated with the second communications link, wherein the first information and the second information are based on the first conditions and the second conditions;

    receive third information from the base station; and

    alternate between transmitting a sounding channel to the base station using the first communications link and transmitting the sounding channel to the base station using the second communications link, wherein at least one of the first conditions and the second conditions is associated with the alternating, and wherein the alternating switches at a switching rate that is based on the third information,wherein the second information is in one layer of an open system interconnection model and the first information is in a higher layer of the open system interconnection model relative to the one layer, andwherein the first communications terminal is configured to receive the second information via a dedicated control channel.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×