Communication system
AssigneesKoninklijke Philips Electronics N.V., Sharp Kabushiki Kaisha
InventorsMatthew P. J. Baker, Timothy J. Moulsley
Life of this patent
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Abstract
In a communication system subject to variations in channel quality, transmit power control is used to reduce the variations in received signal quality. If the channel quality degrades to such an extent that a high transmit power would be required to ensure good received signal quality, the transmit power is decreased and is not increased until the channel quality recovers sufficiently to enable an acceptable transmit power level to be used. While the power is at the decreased level, transmission of a data block may continue, or may be suspended, with the data block being truncated if the whole block has not been transmitted by the end of the time period available for transmission of the data block.
Claims42
A radio station comprising transmitter means for transmitting over a channel in a predetermined time period (0 to tF) a data block comprising
- information symbols (I) and parity check symbols (C);
- receiving means for receiving a Transmitter Power Control (TPC) command indicating either a reduction or an increase in channel quality;
- and
- control means responsive to the indication of a reduction in channel quality according to a first criterion for decreasing the data transmit power and responsive to the indication within the predetermined time period of an increase in channel quality according to a second criterion for increasing the data transmit power;
- wherein the radio station transmits multiple data signals simultaneously so that data transmit power variation occurs on a subset of the multiple data signals.
A method of operating a radio communication system, comprising,
- at a first radio station, transmitting over a channel in a predetermined time period to a second radio station a data block comprising information symbols (I) and parity check symbols (C),
- receiving a Transmitter Power Control (TPC) command indicating either a reduction or an increase in channel quality;
- and
- in response to the indication of a reduction in channel quality according to a first criterion, decreasing the data transmit power and,
- in response to the indication within the predetermined time period of an increase in channel quality according to a second criterion, increasing the data transmit power;
- wherein the radio station transmits multiple data signals simultaneously so that data transmit power variation occurs on a subset of the multiple data signals.
Dependencies are inferred from the claim text.