Efficient CQI signaling in MIMO systems with variable numbers of beams
AssigneesKoninklijke Philips N.V., Sharp Kabushiki Kaisha
InventorsMatthew Peter John Baker, Timothy James Moulsley
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Abstract
The present invention relates to the signaling of channel quality information in a multi-beam transmission system, wherein a plurality of sets of channel quality information are transmitted for controlling the transmission rate on one of the beams, wherein each set of channel quality information is derived dependent on an assumed parameter of at least one other beam which could be transmitted, comprising selecting a parameter of the transmission of each of the sets of channel quality information dependent on the assumed parameter of the at least one other beam.
Claims19
A method of operating a communication system, said method comprising signaling channel quality information (CQI) in a multi-beam transmission system, wherein a number of beams simultaneously transmitted may vary, said method further comprising:
- transmitting a plurality of sequences of channel quality information values for controlling transmission rate on at least one of the beams,
- estimating channel quality by analyzing quality of transmission of each of the number of beams via a plurality of channel quality estimators;
- and
- deriving each sequence of the plurality of sequences of CQI values based on an assumed parameter of each of the number of beams, each sequence depending on transmissions made on other beams of the number of beams, wherein said plurality of sequences includes at least a first sequence of channel quality information values, which assumes no other beams being transmitted, and a second sequence of channel quality information values, which assumes at least one other beam being transmitted, said second sequence of channel quality including at least one value lower than any of those in said first sequence of channel quality.
A multi-beam transmission system, wherein said system comprises:
- means for:
- transmitting a plurality of sequences of channel quality information values (CQI) for controlling the transmission rate on one of the beams;
- and
- estimating channel quality by analysing quality of transmission of each of the number of beams via a plurality of channel quality estimators;
- wherein each sequence of the plurality of sequences of channel quality information values is derived based on an assumed parameter of each of the number of beams, each sequence depending on transmission made on other beams of the number of beams, wherein said plurality of sequences includes at least a first sequence of channel quality information values, which assumes no other beams being transmitted, and a second sequence of channel quality information values, which assume at least one other beam being transmitted, said second sequence of channel quality including at least one value lower than any of those in said first sequence of channel quality.
A computer program stored on a non-transitory computer readable medium for executing the steps;
- comprising:
- signalling channel quality information in a multi-beam transmission system, wherein a number of beams simultaneously transmitted may vary, said method further comprising:
- transmitting a plurality of sequences of channel quality information values for controlling transmission rate on at least one of the beams;
- estimating channel quality by analysing quality of transmission of each of the number of beams via a plurality of channel quality estimators;
- and
- deriving each sequence of the plurality of sequences of CQI values based on an assumed parameter of each of the number of beams, each sequence depending on transmission made on other beams of the number of beams, wherein said plurality of sequences includes at least a first sequence of channel quality information values, which assumes no other beams being transmitted, and a second sequence of channel quality information values, which assume at least one other beam being transmitted, said second sequence of channel quality including at least one value lower than any of those in said first sequence of channel quality.
Dependencies are inferred from the claim text.