Systems and methods for closed-loop and open-loop wireless communications
First Claim
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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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
20 Claims
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1. A base station comprising:
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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. - 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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determining, at a 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 to the communications terminal, the first information effective to cause the communications terminal to operate in the selected closed-loop mode or the selected open-loop mode; when the closed-loop mode is selected, selecting at least one antenna of the plurality of antennas for the communications terminal to use when transmitting data; and when the closed-loop mode is selected, transmitting, from the base station, second information to the communications terminal that identifies the at least one antenna of the plurality of antennas the communications terminal is to use when transmitting data to the base station, the second information transmitted via 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. - View Dependent Claims (19)
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20. An apparatus comprising:
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at least one storage memory; and computer-executable instructions stored on the at least one storage memory, and being executable by the apparatus to perform operations including; determining, at a base station, receive conditions based on receiving a first radio frequency signal and a second radio frequency signal from a communications terminal configured as user equipment, the first radio frequency signal received from a first of a plurality of antennas of the communications terminal, the second radio frequency signal received from a second of the plurality of transmitters; selecting, for the communications terminal and based on the receive conditions, one of a closed-loop mode or an open-loop mode; and in an event that the closed-loop mode is selected; selecting, based on the receive conditions, at least one antenna of the plurality of antennas for the communications terminal to use when transmitting data; and transmitting, from the base station, information that identifies the at least one antenna of the plurality of antennas, the information transmitted via 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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Specification