Method and apparatus for selecting transmission modulation rates in wireless devices for A/V streaming applications
First Claim
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1. A method for determining the transmission rate in a wireless communication system, comprising:
- initiating transmission at an initial data rate;
transmitting data packets at a selected rate which is initially the initial rate;
receiving transmitted data packets;
measuring at least one of the signal to noise ratio (SNR) or received signal strength index (RSSI) or signal to interference and noise ratio (SINR) to produce a measured SNR/SINR signal; and
adjusting the transmission rate based on the measured SNR/SINR signal and information about packet error rate (PER) as a function of SNR/SINR.
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Abstract
A-priori performance measures of a wireless communication system, combined with channel signal to noise ratio and/or signal to interference and noise ratio (SNR/SINR) measurements, are used to determine transmission modulation rate to help optimize real-time streaming. The method and apparatus minimize packet error rates (PER) without actually measuring packet error rates. Instead the receiver measures SNR/SINR and the transmitter uses this measured SNR/SINR data along with information about PER vs. Modulation vs. SNR/SINR to adjust the transmission rate.
54 Citations
20 Claims
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1. A method for determining the transmission rate in a wireless communication system, comprising:
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initiating transmission at an initial data rate;
transmitting data packets at a selected rate which is initially the initial rate;
receiving transmitted data packets;
measuring at least one of the signal to noise ratio (SNR) or received signal strength index (RSSI) or signal to interference and noise ratio (SINR) to produce a measured SNR/SINR signal; and
adjusting the transmission rate based on the measured SNR/SINR signal and information about packet error rate (PER) as a function of SNR/SINR. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless communication system apparatus, comprising:
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a transmitter for transmitting data packets at a selected rate, including;
a transmission rate control section which adjusts the transmission rate based on a measured SNR/SINR signal and information about packet error rate (PER) as a function of SNR/SINR; and
a receiver for receiving the transmitted data packets, including;
a SNR/SINR detection section for detecting at least one of signal to noise ratio (SNR) and signal to interference and noise ratio (SINR) of the received data packets to produce the measured SNR/SINR signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A wireless communication system apparatus, comprising:
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means for transmitting data packets at a selected rate;
means for receiving transmitted data packets;
means for measuring at least one of the signal to noise ratio (SNR) or signal to interference and noise ratio (SINR) of the received data packets to produce a measured SNR/SINR signal; and
means for adjusting the transmission rate based on the measured SNR/SINR signal and information about packet error rate (PER) as a function of SNR/SINR.
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Specification