Abstract
A codebook based channel information feedback method, device and system are provided in the present invention. The codebook based channel information feedback method includes: measuring, by a terminal in a communication system, a parameter of a downlink channel between the terminal and a base station of the communication system; selecting a plurality of precoding matrixes from a precoding codebook by using the parameter of the downlink channel, wherein a plurality of the precoding matrixes can be used by both of single-user multi-input multi-output (MIMO) transport mode and multi-user MIMO transport mode, and the precoding codebook is an aggregation of precoding matrixes; and feeding back a first information for indicating a plurality of the precoding matrixes to the base station.
Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
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Declaration Date | Declaration Reference | Declaring Company | Specification Number | ||||||
4G | 22/04/2014 | ISLD-201404-004 | SONY CORP | No | Family Member | ||||
4G | 29/07/2021 | ISLD-202106-034 | SONY CORP | No | Family Member | ||||
5G | 29/07/2021 | ISLD-202106-034 | SONY CORP | No | Family Member |
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EP2536058A1 | 4G | 22/04/2014 | ISLD-201404-004 | SONY CORP | Yes | Basis Patent | ||||
EP2536058A1 | 4G | 29/07/2021 | ISLD-202106-034 | SONY CORP | Yes | Basis Patent | ||||
EP2536058A1 | 5G | 29/07/2021 | ISLD-202106-034 | SONY CORP | Yes | Basis Patent | ||||
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Technologies
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Use Cases
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Claim
1. An electronic device for user equipment in a wireless communication system, the electronic device comprising:
circuitry configured to
measure a downlink channel based on a control signaling from a base station;
determine a number of data flows that can be simultaneously received by the user equipment;
select two pre-coding matrices from a pre-coding codebook based on a measurement result of the downlink channel and a selection criterion according to the number of data flows;
determine, for feeding back channel state information to the base station, a first pre-coding matrix indicator and a second pre-coding matrix indicator that correspond to the pre-coding matrices satisfying the selection criterion; and
apply the first pre-coding matrix indicator and the second pre-coding matrix indicator to an uplink channel of the user equipment to feed back the channel state information,
wherein in selecting the two pre-coding matrices, the circuitry is further configured to
generate an estimated downlink channel matrix of the downlink channel based on a pilot signal from the base station, and
select the two pre-coding matrices based on differences between the estimated downlink channel matrix and the pre-coding matrices in the pre-coding codebook, the differences including a minimum distance between each of the two pre-coding matrices and the estimated downlink channel matrix.
2. The electronic device according to claim 1, wherein the two pre-coding matrices are adapted to a transmission mode.
3. The electronic device according to claim 1, wherein
the user equipment is served by the base station via a coordinated multi-point (CoMP) transmission scheme, and
the circuitry is further configured to select the two pre-coding matrices for feeding back channel state information to facilitate the CoMP transmission scheme.
4. The electronic device according to claim 1, wherein the two pre-coding matrices are applicable for single-user multiple input multiple output (SU-MIMO) transmission and multi-user multiple input multiple output (MU-MIMO) transmission to facilitate dynamic switching between the SU-MIMO transmission and the MU-MIMO transmission.
5. The electronic device according to claim 1, wherein
the electronic device is the user equipment, and
the electronic device further comprises multiple antennas that are configured to transmit the first and second pre-coding matrix indicators corresponding to the two pre-coding matrices satisfying the selection criterion to the base station.
6. The electronic device according to claim 1, wherein
the electronic device is the base station, and
the electronic device further comprises multiple antennas that are configured to receive the first and second pre-coding matrix indicators corresponding to the pre-coding matrices satisfying the selection criterion to the base station.
7. The electronic device according to claim 1, wherein the circuitry is further configured to select the first pre-coding matrix indicator and the second pre-coding matrix indicator on a same number of data flows based on a same codebook.
8. The electronic device according to claim 1, wherein the circuitry is further configured to
set a first selection criterion in response to the determined number of data flows being equal to one data flow; and
set a second selection criterion in response to the determined number of data flows being greater than one data flow.
9. A method for user equipment in a wireless communication system, the method comprising:
measuring a downlink channel based on a control signaling from a base station;
determining a number of data flows that can be simultaneously received by the user equipment;
selecting, by circuitry, two pre-coding matrices from a pre-coding codebook based on a measurement result of the downlink channel and a selection criterion according to the number of data flows;
determining, by the circuitry for feeding back channel state information to the base station, a first pre-coding matrix indicator and a second pre-coding matrix indicator that correspond to the pre-coding matrices satisfying the selection criterion; and
applying, by the circuitry, the first pre-coding matrix indicator and the second pre-coding matrix indicator to an uplink channel of the user equipment to feed back the channel state information,
wherein the selecting of the two pre-coding matrices is performed by
generating an estimated downlink channel matrix of the downlink channel based on a pilot signal from the base station, and
selecting the two pre-coding, matrices based on differences between the estimated downlink channel matrix and the pre-coding matrices in the pre-coding codebook, the differences including a minimum distance between each of the two pre-coding matrices and the estimated downlink channel matrix.
10. A non-transitory computer readable medium having instructions stored therein that, when executed by processing circuitry, cause the processing circuitry to perform a method for a wireless communication system, the method comprising:
measuring a downlink channel based on a control signaling from a base station;
determining a number of data flows that can be simultaneously received by the user equipment;
selecting two pre-coding matrices from a pre-coding codebook based on a measurement result of the downlink channel and a selection criterion according to the number of data flows;
determining, for feeding back channel state information to the base station, a first pre-coding matrix indicator and a second pre-coding matrix indicator that correspond to the pre-coding matrices satisfying the selection criterion; and
applying the first pre-coding matrix indicator and the second pre-coding matrix indicator to an uplink channel of the user equipment to feed back the channel state information,
wherein the selecting of the two pre-coding. matrices is performed by
generating an estimated downlink channel matrix of the downlink channel based on a pilot signal from the base station, and
selecting the two pre-coding matrices based on differences between the estimated downlink channel matrix and the pre-coding matrices in the pre-coding codebook, the differences including a minimum distance between each of the two pre-coding matrices and the estimated downlink channel matrix.
11. An electronic device for a base station in a wireless communication system, the electronic device comprising:
circuitry, configured to
acquire a first pre-coding matrix indicator and a second pre-coding matrix indicator from an uplink channel of user equipment;
determine, from a pre-coding codebook, a first pre-coding matrix that corresponds to the first pre-coding matrix indicator and a second pre-coding matrix that corresponds to the second pre-coding matrix indicator; and
generate a third pre-coding matrix for the user equipment based on the first pre-coding matrix and the second pre-coding matrix, wherein
the first pre-coding matrix and the second pre-coding matrix are selected by the user equipment based on a measurement result of a downlink channel between the base station and the user equipment, and a selection criterion according to number of data flows that can be simultaneously received by the user equipment, which generates an estimated downlink channel matrix of the downlink channel based on a pilot signal from the base station, and selects the first pre-coding matrix and the second pre-coding matrix based on differences between the first pre-coding matrix and the second pre-coding matrix, and the estimated downlink channel matrix, the differences including a minimum distance between each of the two pre-coding matrices and the estimated downlink channel matrix.
12. The electronic device according to claim 11, wherein the first pre-coding matrix and the second pre-coding matrix are adapted to a transmission mode.
13. The electronic device according to claim 11, wherein
the base station serves the user equipment via a coordinated multi-point (COMP) transmission scheme, and
the circuitry is further configured to generate the third pre-coding matrix based on the first pre-coding matrix and the second pre-coding matrix to facilitate the CoMP transmission scheme.
14. The electronic device according to claim 11, wherein the first pre-coding matrix and the second pre-coding matrix are applicable for single-user multiple input multiple output SU-MIMO) transmission and multi-user multiple input multiple output (MU-MIMO) transmission to facilitate dynamic switching between the SU-MIMO transmission and the MU-MIMO transmission.
15. The electronic device according to claim 11, wherein the circuitry is further configured to select the first pre-coding matrix indicator and the second pre-coding matrix indicator on a same number of data flows based on a same codebook.
16. A method for a base station in a wireless communication system, the method comprising:
acquiring a first pre-coding matrix indicator and a second pre-coding matrix indicator from an uplink channel of user equipment;
determining, by circuitry from a pre-coding codebook, a first pre-coding matrix that corresponds to the first pre-coding matrix indicator and a second pre-coding matrix that corresponds to the second pre-coding matrix indicators indicator; and
generating, by the circuitry, a third pre-coding matrix for the user equipment based on the first pre-coding matrix and the second pre-coding matrix, wherein
the first pre-coding matrix and the second pre-coding matrix are selected by the user equipment based on a measurement result of a downlink channel between the base station and the user equipment, and a selection criterion according to number of data flows that can be simultaneously received by the user equipment, selection of the first pre-coding matrix and the second pre-coding matrix being performed by
generating an estimated downlink channel matrix of the downlink channel based on a pilot signal from the base station, and
selecting the first pre-coding matrix and the second pre-coding matrix based on differences between the first pre-coding matrix and the second pre-coding matrix, and the estimated downlink channel matrix, the differences including a minimum distance between each of the two pre-coding matrices and the estimated downlink channel matrix.
17. A non-transitory computer readable medium having instructions stored therein that, when executed by processing circuitry, cause the processing circuitry to perform a method for a wireless communication system, the method comprising:
acquiring a first pre-coding matrix indicator and a second pre-coding matrix indicator from an uplink channel of user equipment;
determining, from a pre-coding codebook, a first pre-coding matrix that corresponds to the first pre-coding matrix indicator and a second pre-coding matrix that corresponds to the second pre-coding matrix indicators indicator; and
generating a third pre-coding matrix for the user equipment based on the first pre-coding matrix and the second pre-coding matrix, wherein
the first pre-coding matrix and the second pre-coding matrix are selected by the user equipment based on a measurement result of a downlink channel between the base station and the user equipment, and a selection criterion according to number of data flows that can be simultaneously received by the user equipment, selection of the first pre-coding matrix and the second pre-coding matrix being performed by
generating an estimated downlink channel matrix of the downlink channel based on a pilot signal from the base station, and
selecting the first pre-coding matrix and the second pre-coding matrix based on differences between the first pre-coding matrix and the second pre-coding matrix, and the estimated downlink channel matrix, the differences including a minimum distance between each of the two pre-coding matrices and the estimated downlink channel matrix.
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