Reporting of channel state information
A receive node device includes a processor coupled to a memory. The processor is configured to report a first sub-index and to report at least one additional second sub-index for each one of one or more matrices. Each one of the one or more matrices is indexed by the first sub-index and the second sub-index. The first sub-index and the second sub-index have different time-frequency reporting granularity.
1. A receive node device, comprising:
a processor coupled to a memory, wherein the processor is configured to report a first sub-index k 1 of a plurality of first sub-indices and to report a second sub-index k 2 of a plurality of second sub-indices;
wherein the first sub-index k 1 and the second sub-index k 2 are reported by the receive node device on a periodic physical uplink control channel (PUCCH);
wherein the first sub-index k 1 and the second sub-index k 2 correspond to a matrix W which represents channel state information (CSI); and
wherein the plurality of the first sub-indices are a subset of all possible first sub-indices, and the plurality of second sub-indices are a subset of all possible second sub-indices, such that the number of combinations of the first sub-index k 1 and the second sub-index k 2 of the plurality of first sub-indices and second sub-indices reported by the receive node device is smaller than the number of possible combinations of the first sub-index k l and the second sub-index k 2 of all possible first sub-indices and second sub-indices.
2. The receive node device according to claim 1 , wherein the receive node device is part of a multi-carrier cellular communication system having a plurality of sub-carriers, and the plurality of sub-carriers are classified into a plurality of frequency sub-bands.
3. The receive node device according to claim 2 , wherein the first sub-index k1 and the second sub-index k2 are common for the frequency sub-bands.
4. The receive node device according to claim 1 , wherein the matrix W is given by:
W=M k 2 M k 1 or W=M k 1 M k 2 ,
wherein M k 1 is a first sub-matrix and M k 2 is a second sub-matrix.
5. The receive node device according to claim 1 , wherein the matrix W is given by:
W
=
[
M
k
1
M
k
1
ⅇ
j
d
k
2
]
,
wherein d k 2 is a scalar, and M k 1 is a first sub-matrix.
6. A method for reporting channel state information (CSI) in a multi-carrier cellular communication system, comprising:
reporting, by a receive node device, a first sub-index k 1 of a plurality of first sub-indices;
reporting, by the receive node device, a second sub-index k 2 of a plurality of second sub-indices;
wherein the first sub-index k 1 and the second sub-index k 2 are reported by the receive node device on a periodic physical uplink control channel (PUCCH);
wherein the first sub-index k 1 and the second sub-index k 2 correspond to a matrix W which represents channel state information (CSI); and
wherein the plurality of the first sub-indices are a subset of all possible first sub-indices, and the plurality of second sub-indices are a subset of all possible second sub-indices, such that the number of combinations of the first sub-index k 1 and the second sub-index k 2 of the plurality of first sub-indices and second sub-indices reported by the receive node device is smaller than the number of possible combinations of the first sub-index k l and the second sub-index k 2 of all possible first sub-indices and second sub-indices.
7. The method according to claim 6 , wherein the receive node device is part of a multi-carrier cellular communication system having a plurality of sub-carriers, and the plurality of sub-carriers are classified into a plurality of frequency sub-bands.
8. The method according to claim 7 , wherein the first sub-index k1 and the second sub-index k2 are common for the frequency sub-bands.
9. The method according to claim 6 , wherein the matrix W is given by:
W=M k 2 M k 1 or W=M k 1 M k 2 ,
wherein M k 1 is a first sub-matrix and M k 2 is a second sub-matrix.
10. The method according to claim 6 , wherein the matrix W is given by:
W
=
[
M
k
1
M
k
1
ⅇ
j
d
k
2
]
,
wherein d k 2 is a scalar, and M k 1 is a first sub-matrix.
11. A method for receiving channel state information (CSI) in a multi-carrier cellular communication system, comprising:
receiving, by a transmit node, a first sub-index k 1 of a plurality of first sub-indices;
receiving, by the transmit node, a second sub-index k 2 of a plurality of second sub-indices;
wherein the first sub-index k 1 and the second sub-index k 2 are received by the transmit node on a periodic physical uplink control channel (PUCCH);
wherein the first sub-index k 1 and the second sub-index k 2 correspond to a matrix W which represents channel state information (CSI); and
wherein the plurality of the first sub-indices are a subset of all possible first sub-indices, and the plurality of second sub-indices are a subset of all possible second sub-indices, such that the number of combinations of the first sub-index k 1 and the second sub-index k 2 of the plurality of first sub-indices and second sub-indices received by the transmit node is smaller than the number of possible combinations of the first sub-index k 1 and the second sub-index k 2 of all possible first sub-indices and second sub-indices.
12. The method according to claim 11 , wherein:
the transmit node is part of the multi-carrier cellular communication system having a plurality of sub-carriers, and the plurality of sub-carriers are classified into a plurality of frequency sub-bands.
13. The method according to claim 12 , wherein the first sub-index k1 and the second sub-index k2 are common for the frequency sub-bands.
14. The method according to claim 11 , wherein the matrix W is given by:
W=M k 2 M k 1 or W=M k 1 M k 2 ,
wherein M k 1 is a first sub-matrix and M k 2 is a second sub-matrix.
15. The method according to claim 11 , wherein the matrix W is given by:
W
=
[
M
k
1
M
k
1
ⅇ
j
d
k
2
]
,
wherein d k 2 is a scalar, and M k 1 is a first sub-matrix.
16. A transmit node, comprising:
a processor coupled to a memory, wherein the processor is configured to receive a first sub-index k 1 of a plurality of first sub-indices and to receive a second sub-index k 2 of a plurality of second sub-indices;
wherein the first sub-index k 1 and the second sub-index k 2 are received on a periodic physical uplink control channel (PUCCH);
wherein the first sub-index k 1 and the second sub-index k 2 corresponds to a matrix W which represents channel state information (CSI); and
wherein the plurality of the first sub-indices are a subset of all possible first sub-indices, and the plurality of second sub-indices are a subset of all possible second sub-indices, such that the number of combinations of the first sub-index k 1 and the second sub-index k 2 of the plurality of first sub-indices and second sub-indices is smaller than the number of possible combinations of the first sub-index k 1 and the second sub-index k 2 of all possible first sub-indices and second sub-indices.
17. The transmit node according to claim 16 , wherein:
the transmit node in is part of a multi-carrier cellular communication system having a plurality of sub-carriers, and the plurality of sub-carriers are classified into a plurality of frequency sub-bands.
18. The transmit node according to claim 17 , wherein the first sub-index k1 and the second sub-index k2 are common for the frequency sub-bands.
19. The transmit node according to claim 16 , wherein the matrix W is given by:
W=M k 2 M k 1 or W=M k 1 M k 2 ,
wherein M k 1 is a first sub-matrix and M k 2 is a second sub-matrix.
20. The transmit node according to claim 16 , wherein the matrix W is given by:
W
=
[
M
k
1
M
k
1
ⅇ
j
d
k
2
]
,
wherein d k 2 is a scalar, and M k 1 is a first sub-matrix.