Abstract
A method for a user equipment to precode and transmit an uplink signal efficiently in a 4-antenna system and a method for a base station to receive the transmitted signal efficiently are disclosed. Four antennas of a user equipment can be grouped by a 2-antenna unit. In consideration of this antenna group it is able to perform precoding using antenna selection/DFT matrix of the antenna group unit. Moreover a rank-3 codebook can be configured to include a precoding matrix of a type in consideration of power balance per antenna and a precoding matrix including one non-zero component only in one row for maintaining a good CM property.
| Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
|---|---|---|---|---|---|---|---|---|---|
| Declaration Date | Declaration Reference | Declaring Company | Specification Number | ||||||
| 4G | 07/08/2011 | ISLD-201108-003 | LG | No | Family Member | ||||
| Not Available | 16/09/2012 | ISLD-201209-003 | LG | No | Family Member | ||||
| Not Available | 22/10/2012 | ISLD-201209-016 | LG | Yes | Family Member | ||||
| 5G | 20/10/2018 | ISLD-201810-045 | LG | Yes | Family Member | ||||
Specification Information
Specification Information
Technologies
Family Information
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| Publication No | Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | Status | National Phase Entries | |||||
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Technologies
Resource configuration Multiple-Input Multiple-Output(MIMO)/Massive MIMO
Product
User Equipment (UE/Terminal)Base Station (eNB/gNB)
Use Cases
Wireless communication
Services
Data processing
Claim
1. A method of transmitting a signal, which is transmitted to a base station by a user equipment configured to use 4 antennas, the method comprising: obtaining transmission rank information; outputting a precoded signal by precoding layer signals, of which number corresponds to the transmission rank using a specific precoding matrix corresponding to the transmission rank, wherein the specific precoding matrix is selected from a A- antenna codebook; and transmitting the precoded signal to the base station, wherein the 4 antennas are grouped into a first antenna group including two of the 4 antennas and a second antenna group including the rest of the 4 antennas, and wherein the 4-antenna codebook includes a first type precoding matrix, in which two components corresponding to the first antenna group are zero and two components corresponding to the second antenna group construct a DFT matrix, and a second type precoding matrix, in which two components corresponding to the first antenna group and two components corresponding to the second antenna group construct DFT matrixes, respectively, for a rank1.
2. The method of claim 1, wherein the first type precoding matrix is an antenna group selection matrix and wherein the second type precoding matrix is a DFT matrix.
3. The method of claim 1, wherein the second type precoding matrix includes a code in which the two components corresponding to the first antenna group and the two components corresponding to the second antenna group are mutually orthogonal.
4. The method of claim 1, wherein the 4-antenna codebook includes a precoding matrix, in which two components corresponding to either the first antenna group or the second antenna group are 0 in a first column and two components corresponding to either the second antenna group or the first antenna group are 0 in a second column, for a rank 2.
5. The method of claim 4, wherein the 4-antenna codebook includes at least one selected from the group consisting of a precoding matrix for performing a layer swapping function of changing positions of two layer signals and an antenna permutation precoding matrix for changing a position of an antenna, for the rank 2.
6. The method of claim 1, wherein each of the first type precoding matrix and the second type precoding matrix is the precoding matrix multiplied by a same constant.
7. The method of claim 6, wherein the first type precoding matrix is configured to transmit the precoded signal to the base station using 1/2 of a maximum available transmission power of the user equipment.
8. A method of transmitting a signal, which is transmitted to a base station by a user equipment configured to use 4 antennas grouped into a first antenna group including two of the 4 antennas and a second antenna group including the rest of the 4 antennas, the method comprising: turning off the first antenna group in a specific situation; and transmitting the signal to the base station via the second antenna group, wherein turning off the first antenna group turning-off is performed by precoding using a rank-1 precoding matrix to turn off the first antenna group.
9. The method of claim 8, wherein the rank-1 precoding matrix includes a precoding matrix, in which two components corresponding to the first antenna group are zero and two components corresponding to the second antenna group construct a DFT matrix
10. A method of receiving a signal, which is received by a base station from a user equipment configured to use 4 antennas, the method comprising: receiving a reception signal from the user equipment; obtaining transmission rank and precoding matrix identification information used by the user equipment for the reception signal; and performing reverse processing of precoding on the reception signal using a specific precoding matrix corresponding to the transmission rank and precoding matrix identification information selected from a 4-antenna codebook, wherein the 4 antennas are grouped into a first antenna group including two of the 4 antennas and a second antenna group including the rest of the 4 antennas and wherein the 4-antenna codebook includes a first type precoding matrix, in which two components corresponding to the first antenna group are zero and two components corresponding to the second antenna group construct a DFT matrix, and a second type precoding matrix, in which two components corresponding to the first antenna group and two components corresponding to the second antenna group construct DFT matrixes, respectively, for a rank1
11. The method of claim 10, wherein the first type precoding matrix is an antenna group selection matrix and wherein the second type precoding matrix is a DFT matrix
12. The method of claim 10, wherein the 4-antenna codebook includes a precoding matrix, in which two components corresponding to either the first antenna group or the second antenna group are 0 in a first column and two components corresponding to either the second antenna group or the first antenna group are 0 in a second column, for a rank 2
13. A user equipment comprising: a first antenna group including a first antenna and a second antenna; a second antenna group including a third antenna and a fourth antenna; a memory configured to store a 4-antenna codebook including a first type precoding matrix, in which two components corresponding to the first antenna group are zero and two components corresponding to the second antenna group construct a DFT matrix, and a second type precoding matrix, in which two components corresponding to the first antenna group and two components corresponding to the second antenna group construct DFT matrixes, respectively, for a rank 1 ; and a precoder outputting a precoded signal by precoding layer signals, of which number corresponds to the transmission rank, using a specific precoding matrix corresponding to a transmission rank, wherein the specific precoding matrix is selected from the 4-antenna codebook stored in the memory, wherein the precoded signal precoded by the precoder is transmitted to a base station via at least one of the first antenna group and the second antenna group
14. The user equipment of claim 13, wherein the first type precoding matrix is an antenna group selection matrix and wherein the second type precoding matrix is a DFT matrix
15. The user equipment of claim 13, wherein the second type precoding matrix includes a code in which the two components corresponding to the first antenna group and the two components corresponding to the second antenna group are mutually orthogonal
16. The user equipment of claim 13, wherein the 4-antenna codebook includes a precoding matrix, in which two components corresponding to either the first antenna group or the second antenna group are 0 in a first column and two components corresponding to either the second antenna group or the first antenna group are 0 in a second column, for a rank 2
17. The user equipment of claim 16, wherein the 4-antenna codebook includes at least one selected from the group consisting of a precoding matrix for performing a layer swapping function of changing positions of two layer signals and an antenna permutation precoding matrix for changing a position of an antenna, for the rank 2
18. The user equipment of claim 13, wherein each of the first type precoding matrix and the second type precoding matrix is the precoding matrix multiplied by a same constant
19. The user equipment of claim 18, wherein the first type precoding matrix is configured to transmit the precoded signal to the base station using 1/2 of a maximum available transmission power of the user equipment.
20. A user equipment comprising: a first antenna group including a first antenna and a second antenna; a second antenna group including a third antenna and a fourth antenna; a memory configured to store a 4-antenna codebook including a precoding matrix to turn off the first antenna group for a rank 1 ; and a precoder outputting a precoded signal by precoding a transmission signal using the precoding matrix, wherein the precoded signal precoded by the precoder is transmitted to a base station via the first antenna group.
21. The user equipment of claim 20, wherein the precoding matrix has two components corresponding to the first antenna set to 0 and has another two components corresponding to the second antenna group construct a DFT matrix.
22. A base station comprising: an antenna configured to receive a reception signal transmitted from a user equipment configured to transmit a signal using four antennas grouped into a first antenna group including two of the 4 antennas and a second antenna group including the rest of the 4 antennas; a memory configured to store a 4-antenna codebook including a first type precoding matrix, in which two components corresponding to the first antenna group are zero and two components corresponding to the second antenna group construct a DFT matrix, and a second type precoding matrix, in which two components corresponding to the first antenna group and two components corresponding to the second antenna group construct DFT matrixes, respectively, for a rank 1; and a precoder performing reverse processing of precoding on the reception signal by using a specific precoding matrix corresponding to transmission rank and precoding matrix identification information used by the user equipment, wherein the specific precoding matrix is selectedfrom the 4-antenna codebook.
23. The base station of claim 22, wherein the 4-antenna codebook includes a precoding matrix, in which two components corresponding to either the first antenna group or the second antenna group are 0 in a first column and two components corresponding to either the second antenna group or the first antenna group are 0 in a second column, for a rank 2.']
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SUMMARY
ClaimChart-WO2010093179A2-STO
Patent number:WO2010093179A2
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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.