Abstract
The invention relates to a method for transmitting and a method for reconstructing channel quality information in a communication system. Further the invention also provides a transmitter and receiver performing these methods respectively. The invention suggests a scheme for communicating channel quality measures that on the one hand allows for an accurate reconstruction of the channel quality measures at the receiver and on the other hand requires an acceptable transmission overhead. This is achieved by partitioning channel quality measures into at least two partitions and to compress the values partition-wise for example by means of a discrete cosine transform and the transmission of only a subset of the resulting coefficients.
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Technologies
Channel Status Information(CSI) Reporting
Product
Use Cases
Wireless communication
Services
Claim
1. A method for transmitting channel quality information in a communication system comprising the following steps performed by a transmitting entity:
partitioning channel quality values into at least two partitions by comparing respective channel quality values to at least one channel quality threshold value;
transforming the channel quality values of at least one of the at least two partitions to obtain channel quality coefficients;
encoding the channel quality coefficients to obtain signaling information on channel quality; and
signaling the signaling information on the channel quality to a receiving entity.', 'partitioning channel quality values into at least two partitions by comparing respective channel quality values to at least one channel quality threshold value;', 'transforming the channel quality values of at least one of the at least two partitions to obtain channel quality coefficients;', 'encoding the channel quality coefficients to obtain signaling information on channel quality; and', 'signaling the signaling information on the channel quality to a receiving entity.
2. The method according to claim 1, wherein a number of the channel quality coefficients obtained for a respective partition by transformation is equal to a number of the channel quality values of the respective partition.
3. The method according to claim 1, wherein the transformation used for transforming the channel quality values is a discrete cosine transformation, a Fourier transformation or a transformation based on a continuous function.
4. A method for transmitting channel quality information in a communication system comprising the following steps performed by a transmitting entity:
partitioning channel quality values into at least two partitions by comparing respective channel quality values to at least one channel quality threshold value;
encoding the channel quality values to obtain signaling information on channel quality; and
signaling the signaling information on the channel quality to a receiving entity.', 'partitioning channel quality values into at least two partitions by comparing respective channel quality values to at least one channel quality threshold value;', 'encoding the channel quality values to obtain signaling information on channel quality; and', 'signaling the signaling information on the channel quality to a receiving entity.
5. The method according to claim 1 or 4, wherein the signaling information on the channel quality indicates a number of encoded channel quality coefficients or values to the receiving entity that is smaller than the number of the channel quality coefficients or values, respectively, in the at least two partitions.
6. The method according to claim 1 or 4, wherein the channel quality coefficients or values are encoded by selecting the minimum number of channel quality coefficients or values, respectively, from a partition yielding an accumulated power level equal to or higher than a threshold power level.
7. The method according to claim 1, wherein the channel quality coefficients or values are encoded by selecting a subset of the channel quality coefficients or values, respectively, from at least two partitions and wherein the cardinality of a first subset of the subsets depends on the cardinality of a second subset of the subsets.
8. The method according to claim 1 or 4, further comprising:
determining at least one combined channel quality coefficient or value derived from at least two channel quality coefficients or values, respectively,
wherein the at least one combined channel quality coefficient or value is encoded.', 'determining at least one combined channel quality coefficient or value derived from at least two channel quality coefficients or values, respectively,', 'wherein the at least one combined channel quality coefficient or value is encoded.
9. The method according to claim 1 or 4, wherein the channel quality coefficients or values are encoded by selecting a number of channel quality coefficients or values, respectively, from the at least two partitions, and wherein the number of selected channel quality coefficients or values from a first partition of the at least two partitions depends on at least one constraint, while the remaining number of selected channel quality coefficients or values is selected from at least the second partition of the at least two partitions
10. The method according to claim 1, wherein a respective channel quality coefficient or value in a respective partition is identified by an index, and wherein the method further comprises the step of determining averaged channel quality coefficients or values prior to encoding, wherein the averaged channel quality coefficients or values are encoded, wherein the averaged channel quality coefficients or values are determined by a coefficient-wise or value-wise averaging of channel quality coefficients or values, respectively from at least two partitions and wherein channel quality coefficients or values, respectively from at least two partitions having the same index are averaged coefficient-wise or value-wise, respectively
11. The method according to claim 1, further comprising the step of reordering the channel quality coefficients or values of at least one partition prior to their encoding and wherein the reordering is performed according to one of a plurality of reordering maps or according to one of a plurality of interleaving schemes
12. The method according to claim 1, wherein a respective channel quality coefficient or value in a respective partition is identified by an index, and wherein the signaling information on the channel quality indicates indices of the encoded channel quality coefficients or values of a respective partition included in the signaling information on the channel quality and wherein the signaling information on the channel quality further comprises information on the values of the encoded channel quality coefficients or values
13. The method according to claim 1, further comprising partitioning at least one of the at least two partitions prior to encoding to obtain at least two sub-partitions and transforming the channel quality values in at least one sub-partition to obtain channel quality coefficients for a respective sub-partition prior to encoding
14. A method for reconstructing channel quality values comprising the following steps performed by a receiving entity:
receiving signaling information on channel quality from a transmitting entity;
decoding the signaling information on the channel quality to obtain channel quality coefficients of at least two partitions;
transforming the channel quality coefficients of each partition to obtain channel quality values for a respective partition; and
reconstructing the channel quality values using channel quality values of at least one partition, wherein the channel quality values of the at least one partition having been partitioned by comparing respective channel quality values to at least one channel quality threshold value.', 'receiving signaling information on channel quality from a transmitting entity;', 'decoding the signaling information on the channel quality to obtain channel quality coefficients of at least two partitions;', 'transforming the channel quality coefficients of each partition to obtain channel quality values for a respective partition; and', 'reconstructing the channel quality values using channel quality values of at least one partition, wherein the channel quality values of the at least one partition having been partitioned by comparing respective channel quality values to at least one channel quality threshold value
15. A method for reconstructing channel quality values comprising the following steps performed by a receiving entity:
receiving signaling information on channel quality from a transmitting entity;
decoding the signaling information on the channel quality to obtain channel quality values of at least two partitions; and
reconstructing the channel quality values using channel quality values of at least one partition, wherein the channel quality values of the at least one partition having been partitioned by comparing respective channel quality values to at least one channel quality threshold value.', 'receiving signaling information on channel quality from a transmitting entity;', 'decoding the signaling information on the channel quality to obtain channel quality values of at least two partitions; and', 'reconstructing the channel quality values using channel quality values of at least one partition, wherein the channel quality values of the at least one partition having been partitioned by comparing respective channel quality values to at least one channel quality threshold value.16. A transmitter for transmitting channel quality information in a communication system, the transmitter comprising:
a processing unit configured to partition channel quality values into at least two partitions by comparing respective channel quality values to at least one channel quality threshold value,
wherein the processing unit is adapted to transform the channel quality values of at least one of the at least two partitions to obtain channel quality coefficients;
a coding unit configured to encode the channel quality coefficients to obtain signaling information on channel quality; and
a transmitting unit configured to signal the signaling information on the channel quality to a receiving entity.', 'a processing unit configured to partition channel quality values into at least two partitions by comparing respective channel quality values to at least one channel quality threshold value,', 'wherein the processing unit is adapted to transform the channel quality values of at least one of the at least two partitions to obtain channel quality coefficients;', 'a coding unit configured to encode the channel quality coefficients to obtain signaling information on channel quality; and', 'a transmitting unit configured to signal the signaling information on the channel quality to a receiving entity.17. A transmitter for transmitting channel quality information in a communication system, the transmitter comprising:
a processing unit configured to partition channel quality values into at least two partitions by comparing respective channel quality values to at least one channel quality threshold value;
a coding unit configured to encode the channel quality values to obtain signaling information on the channel quality; and
a transmitting unit configured to signal the signaling information on channel quality to a receiving entity.', 'a processing unit configured to partition channel quality values into at least two partitions by comparing respective channel quality values to at least one channel quality threshold value;', 'a coding unit configured to encode the channel quality values to obtain signaling information on the channel quality; and', 'a transmitting unit configured to signal the signaling information on channel quality to a receiving entity.18. A receiver for reconstructing channel quality values comprising:
a receiving unit configured to receive signaling information on channel quality from a transmitting entity;
a decoding unit configured to decode the signaling information on the channel quality to obtain channel quality coefficients of at least two partitions; and
a processing unit configured to transform the channel quality coefficients of each partition to obtain channel quality values for a respective partition,
wherein the processing unit is adapted to reconstruct channel quality values using the channel quality values of at least one partition and wherein the channel quality values of the at least one partition having been partitioned by comparing respective channel quality values to at least one channel quality threshold value.', 'a receiving unit configured to receive signaling information on channel quality from a transmitting entity;', 'a decoding unit configured to decode the signaling information on the channel quality to obtain channel quality coefficients of at least two partitions; and', 'a processing unit configured to transform the channel quality coefficients of each partition to obtain channel quality values for a respective partition,', 'wherein the processing unit is adapted to reconstruct channel quality values using the channel quality values of at least one partition and wherein the channel quality values of the at least one partition having been partitioned by comparing respective channel quality values to at least one channel quality threshold value.19. A receiver for reconstructing channel quality values comprising:
a receiving unit configured to receive signaling information on channel quality from a transmitting entity;
a decoding unit configured to decode the signaling information on the channel quality to obtain channel quality values of at least two partitions; and
a processing unit configured to reconstruct channel quality values using the channel quality values of at least one partition wherein the channel quality values of the at least one partition having been partitioned by comparing respective channel quality values to at least one channel quality threshold value.', 'a receiving unit configured to receive signaling information on channel quality from a transmitting entity;', 'a decoding unit configured to decode the signaling information on the channel quality to obtain channel quality values of at least two partitions; and', 'a processing unit configured to reconstruct channel quality values using the channel quality values of at least one partition wherein the channel quality values of the at least one partition having been partitioned by comparing respective channel quality values to at least one channel quality threshold value.']
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