Methods and systems for transmission mode selection in a multi channel communication system
AssigneeQUALCOMM Incorporated
InventorsIrina Medvedev, John W. Ketchum, J. Rodney Walton
Life of this patent
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Abstract
Techniques to select a suitable transmission mode for a data transmission in a multi channel communication system with multiple spatial channels having varying SNRs are presented in this disclosure. For certain embodiments, a closed-loop technique may be applied, in which back-off factors used to calculate an effective SNR value fed back to a transmitter are adjusted. An open-loop rate control scheme is also presented in which a transmitter may select a data rate and number of streams based on whether transmitted packets are received in error at a receiver.
Claims44
A method for open-loop rate control for transmissions between a transmitting terminal and a receiving terminal in a multi-channel wireless communications system, comprising:
- transmitting one or more data packets using a plurality of spatial streams at a transmission rate, wherein the number of the plurality of spatial streams used is based on whether the transmitting terminal has information of a receiver's performance capability for detecting data packets;
- and
- adjusting the transmission rate for transmitting subsequent packets based on whether one or more of the transmitted data packets were received in error.
An apparatus for open-loop rate control for transmissions between a transmitting terminal and a receiving terminal in a multi-channel wireless communications system, comprising:
- a transmitter configured to transmit one or more data packets using a plurality of spatial streams at a transmission rate, wherein the number of the plurality of spatial streams used is based on whether the transmitting terminal has information of a receiver's performance capability for detecting data packets;
- and
- a circuit configured to adjust the transmission rate for transmitting subsequent packets based on whether one or more of the transmitted data packets were received in error.
An apparatus for open-loop rate control for transmissions between a transmitting terminal and a receiving terminal in a multi-channel wireless communications system, comprising:
- means for transmitting one or more data packets using a plurality of spatial streams at a transmission rate, wherein the number of the plurality of spatial streams used is based on whether the transmitting terminal has information of a receiver's performance capability for detecting data packets;
- and
- means for adjusting the transmission rate for transmitting subsequent packets based on whether one or more of the transmitted data packets were received in error.
A computer-program product for open-loop rate control for transmissions between a transmitting terminal and a receiving terminal in a multi-channel wireless communications system, comprising a non-transitory computer-readable medium having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:
- instructions for transmitting one or more data packets using a plurality of spatial streams at a transmission rate, wherein the number of the plurality of spatial streams used is based on whether the transmitting terminal has information of a receiver's performance capability for detecting data packets;
- and
- instructions for adjusting the transmission rate for transmitting subsequent packets based on whether one or more of the transmitted data packets were received in error.
Dependencies are inferred from the claim text.