Systems and methods for closed-loop and open-loop wireless communications
First Claim
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.
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Accused Products
Abstract
The present invention relates to user equipment (UE) having at least two transmit antennas that are capable of transmitting RF signals to a base station, which selects either an open-loop mode or a closed-loop mode depending on how the RF signals from the UE are changing. In the closed-loop mode, the base station periodically evaluates the RF signals from the UE and selects which of the UE'"'"'s transmit antennas are to be used. This information is then sent to the UE. If the base station determines that the RF signals from the UE are changing too rapidly for effective control, then the base station selects the open-loop mode, such that the UE selects which of the UE'"'"'s transmit antennas are to be used.
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Citations
22 Claims
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1. A first communications terminal comprising:
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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, and wherein the first communications terminal is configured to receive the second information via a dedicated control channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method comprising:
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providing, using a first communications terminal, a plurality of antennas; receiving, using the first communications terminal, first information and second information from a base station, the receiving second information comprising receiving the second information via a dedicated control channel; selecting, using the first communications terminal, a mode for communications from a closed-loop mode and an open-loop mode 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; receiving third information from the base station; and responsive to receiving the third information from the base station, switching, using the first communications terminal, transmission of a sounding channel to the base station between a first and second communication link to the base station, the switching based on the third information, the first communications link utilizing a first set of antenna of the plurality of antenna and the second communications link utilizing a second set of antenna of the plurality of antenna. - View Dependent Claims (20, 21, 22)
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19. A communications terminal comprising:
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a plurality of antennas; and transceiver circuitry associated with the plurality of antennas and configured to; receive first information, second information, and third information by way of a base station and via at least one message; select a mode for communications with the base station from a closed-loop mode and an open-loop mode based on the first information, wherein during the closed-loop mode, at least one of the plurality of antennas is selected for transmitting based on the second information; and switch, using the first communications terminal, transmission of a sounding channel to the base station between a first and second communication link to the base station, the switching based on the third information, wherein the first communications link utilizes a first set of antenna of the plurality of antenna and the second communications link utilizes a second set of antenna of the plurality of antenna, 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, and wherein the communications terminal is configured to receive the second information via a dedicated control channel.
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Specification