Method and device for transmitting channel state information
View Patent ↗Disclosed is a method for transmitting channel state information, for realizing the transmission of channel information which supports CoMP transmission. The method includes: a terminal receiving from a base station control signaling which indicates to the terminal to perform channel information feedback, the control signaling including indication information about a plurality of CSI-RS resources for performing aggregation feedback; the terminal obtaining the plurality of CSI-RS resources based on the indication information to perform channel estimation and constructing a channel matrix according to a PDSCH transmission solution over a preset CSI reference resource, the correlation between the signal over the plurality of CSI-RS resources and the signal of a UERS port and the constructed channel matrix and transmitting the CSI to the base station. Also disclosed is a device for implementing the method.
1. A method for transmitting Channel State Information, CSI, comprising:
receiving, by a user equipment, control signaling, from a base station, to instruct the user equipment to feed back channel information, wherein the control signaling includes indication information of a plurality of Channel State Information-Reference Signal, CSI-RS, resources for an aggregated feedback;
performing, by the user equipment, channel estimation based on the plurality of CSI-RS resources obtained from the indication information and constructing a channel matrix according to a result of channel estimation; and
determining, by the user equipment, CSI according to a preset Physical Downlink Shared Channel, PDSCH, transmission scheme over a CSI reference resource, a correspondence relationship between signals over the plurality of CSI-RS resources and signals on UERS ports and the constructed channel matrix, and transmitting the CSI to the base station;
wherein determining by the user equipment the CSI according to the preset PDSCH transmission scheme over the CSI reference resource, the correspondence relationship between signals over the plurality of CSI-RS resources and signals on UERS ports and the constructed channel matrix comprises:
determining, by the user equipment, a pre-coding matrix according to the preset PDSCH transmission scheme over the CSI reference resource, the correspondence relationship
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between signals over the plurality of CSI-RS resources and signals on UERS ports and the constructed channel matrix, and determining the CSI according to the determined pre-coding matrix, wherein a k,l ( ) represents a PDSCH or a UERS signal transmitted on UERS antenna port {7, . . . , 6+ν} over the (k,l)-th resource element, ν represents the number of layers, k represents a sub-carrier index in frequency domain, and l represents an Orthogonal Frequency Division Multiplexing, OFDM, symbol index in time domain, ã k,l ( ) represents a signal transmitted on CSI-RS antenna port {{15, . . . , 14+P 1 } 1 , {15, . . . , 14+P 2 } 2 , . . . , {15, . . . , 14+P N } N } over the (k,l)-th resource element, {15, . . . , 14+P n } n represents CSI-RS ports included in the n-th CSI-RS resource, a port number ranges from 15 to 14+P n , P n represents the number of CSI-RS ports included in the n-th CSI-RS resource, N represents the number of CSI-RS resources, and W is 1 or represents a pre-coding matrix corresponding to resource elements of UERS antenna ports.
2. The method according to claim 1 , wherein if the total number of CSI-RS ports over the N CSI-RS resources is 1, then W is 1; otherwise, W represents a pre-coding matrix corresponding to a reported Pre-coding Matrix Indicator, PMI, applied on the (k,l)-th resource element.
3. The method according to claim 1 , wherein
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and if the total number of CSI-RS ports over the N CSI-RS resources is 1, then W n is 1; otherwise, W n represents a pre-coding matrix corresponding to a reported PMI for the n-th CSI-RS resource applied on the (k,l)-th resource element.
4. The method according to claim 1 , wherein
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and if the total number of CSI-RS ports over the N CSI-RS resources is 1, then W n is 1; otherwise, W n represents a pre-coding matrix corresponding to a reported PMI for the n-th CSI-RS resource applied on the (k,l)-th resource element, and φ n represents correlation information between the CSI-RS resources of the (k,l)-th resource element.
5. The method according to claim 4 , wherein the correlation information between the CSI-RS resources comprises phase information and/or amplitude information.
6. A method for transmitting CSI, comprising:
sending, by a base station, control signaling to a user equipment to instruct the user equipment to feed back channel information, wherein the control signaling includes indication information of a plurality of CSI-RS resources for an aggregated feedback; and
receiving, by the base station, CSI from the user equipment for the plurality of CSI-RS resources;
wherein the CSI received, by the base station, from the user equipment for the plurality of CSI-RS resources is determined according to a preset PDSCH transmission scheme over a CSI reference resource, a correspondence relationship between signals over the plurality of CSI-RS resources and signals on UERS ports and a constructed channel matrix; and
the correspondence relationship is
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wherein a k,l ( ) represents a PDSCH or a UERS signal transmitted on UERS antenna port {7, . . . , 6+ν} over the (k,l)-th resource element, ν represents the number of layers, k represents the sub-carrier index in frequency domain, and l represents the Orthogonal Frequency Division Multiplexing, OFDM, symbol index in time domain, ã k,l ( ) represents a signal transmitted on CSI-RS antenna port {{15, . . . , 14+P 1 } 1 , {15, . . . , 14+P 2 } 2 , . . . , {15, . . . , 14+P N } N } over the (k,l)-th resource element, {15, . . . , 14+P n } n represents CSI-RS ports included in the n-th CSI-RS resource, a port number ranges from 15 to 14+P n , P n represents the number of CSI-RS ports included in the n-th CSI-RS resource, N represents the number of CSI-RS resources, and W is 1 or represents a pre-coding matrix corresponding to resource elements of UERS antenna ports.
7. The method according to claim 6 , wherein if the total number of CSI-RS ports over the N CSI-RS resources is 1, then W is 1; otherwise, W represents a pre-coding matrix corresponding to a reported PMI applied on the (k,l)-th resource element.
8. The method according to claim 6 , wherein
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=
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W
1
⋮
W
N
]
,
and if the total number of CSI-RS ports over the N CSI-RS resources is 1, then W n is 1; otherwise, W n represents a pre-coding matrix corresponding to a reported PMI for the n-th CSI-RS resource applied on the (k,l)-th resource element.
9. The method according to claim 6 , wherein
W
=
[
W
1
⋮
φ
N
W
N
]
,
and if the total number of CSI-RS ports over the N CSI-RS resources is 1, then W n is 1; otherwise, W n represents a pre-coding matrix corresponding to a reported PMI for the n-th CSI-RS resource applied on the (k,l)-th resource element, and φ n represents correlation information between the CSI-RS resources of the (k,l)-th resource element.
10. The method according to claim 9 , wherein the correlation information between the CSI-RS resources comprises phase information and/or amplitude information.
11. A user equipment, comprising:
an interface module configured to receive control signaling, from a base station, to instruct the user equipment to feed back channel information, wherein the control signaling includes indication information of a plurality of CSI-RS resources for an aggregated feedback;
a channel estimation module configured to perform channel estimation based on the plurality of CSI-RS resources obtained from the indication information and to construct a channel matrix according to a result of channel estimation;
a CSI determination module configured to determine CSI according to a preset Physical Downlink Shared Channel, PDSCH, transmission scheme over a CSI reference resource, a correspondence relationship between signals over the plurality of CSI-RS resources and signals on UERS ports and the constructed channel matrix, and to instruct the interface module to transmit the CSI to the base station;
wherein the CSI determination module is configured to determine a pre-coding matrix according to the preset PDSCH transmission scheme over the CSI reference resource, the correspondence relationship
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between signals over the plurality of CSI-RS resources and signals on UERS ports and the constructed channel matrix and to determine the CSI according to the determined pre-coding matrix, wherein a k,l ( ) represents a PDSCH or a UERS signal transmitted on UERS antenna port {7, . . . , 6+ν} over the (k,l)-th resource element, ν represents the number of layers, k represents a sub-carrier index in frequency domain, and l represents an OFDM symbol index in time domain, ã k,l ( ) represents a signal transmitted on CSI-RS antenna port {{15, . . . , 14+P 1 } 1 , {15, . . . , 14+P 2 } 2 , . . . , {15, . . . , 14+P N } N } over the (k,l)-th resource element, {15, . . . , 14+P n } n represents CSI-RS ports included in the n-th CSI-RS resource, a port number ranges from 15 to 14+P n , P n represents the number of CSI-RS ports included in the n-th CSI-RS resource, N represents the number of CSI-RS resources, and W is 1 or represents a pre-coding matrix corresponding to resource elements of UERS antenna ports.
12. The user equipment according to claim 11 , wherein if the total number of CSI-RS ports over the N CSI-RS resources is 1, then W is 1; otherwise, W represents a pre-coding matrix corresponding to a reported PMI applied on the (k,l)-th resource element.
13. The user equipment according to claim 11 , wherein
W
=
[
W
1
⋮
W
N
]
,
and if the total number of CSI-RS ports over the N CSI-RS resources is 1, then W n is 1; otherwise, W n represents a pre-coding matrix corresponding to a reported PMI for the n-th CSI-RS resource applied on the (k,l)-th resource element.
14. The user equipment according to claim 11 , wherein
W
=
[
W
1
⋮
φ
N
W
N
]
,
and if the total number of CSI-RS ports over the N CSI-RS resources is 1, then W n is 1; otherwise W n represents a pre-coding matrix corresponding to a reported PMI for the n-th CSI-RS resource applied on the (k,l)-th resource element, and φ n represents correlation information between the CSI-RS resources of the (k,l)-th resource element.
15. The user equipment according to claim 14 , wherein the correlation information between the CSI-RS resources comprises phase information and/or amplitude information.