Codebook design and structure for advanced wireless communication systems
A base station capable of communicating with a user equipment (UE) includes a transceiver configured to transmit Channel State Information-Reference Signal (CSI-RS) according to a CSI-RS configuration comprising a number of antenna ports, and downlink signals containing the CSI-RS configuration and a precoding-matrix-construction configuration for precoding matrix indicator (PMI) reporting on physical downlink shared channels (PDSCH), the precoding-matrix-construction configuration comprising a first and second sampling factors, O 1 and O 2 , and a first and second numbers, N 1 and N 2 , receive, from the UE, uplink signals containing a precoding matrix indicator (PMI) derived using the CSI-RS according to the precoding-matrix-construction configuration, a controller configured to convert the PMI to one of predetermined precoding matrices. Other embodiments including UEs and methods are disclosed.
1. A base station capable of communicating with a user equipment (UE), the base station comprising:
a transceiver configured to:
transmit:
Channel State Information-Reference Signal (CSI-RS) according to a CSI-RS configuration comprising a plurality of antenna ports; and
downlink signals containing the CSI-RS configuration and a precoding-matrix-construction configuration for precoding matrix indicator (PMI) reporting on physical downlink shared channels (PDSCH), the precoding-matrix-construction configuration comprising a first and second oversampling factors, O 1 and O 2 , and a first and second numbers, N 1 and N 2 ; and
receive, from the UE, uplink signals containing a plurality of PMIs derived using the CSI-RS according to the precoding-matrix-construction configuration; and
a controller configured to convert the plurality of PMIs to one of predetermined precoding matrices having a form of
[
h
⊗
v
ⅇ
j
φ
h
⊗
v
]
,
wherein φ is a co-phasing factor, and h and v are oversampled Discrete Fourier Transform (DFT) vectors of size N 1 ×1 and N 2 ×1, respectively, and
h=[1 e j2πm 1 /D 1 . . . e j2(N 1 −1)πm 1 /D 1 ] t ,
v=[1 e j2πm 2 /D 2 . . . e j2(N 2 −1)πm 1 /D 1 ] t , and
where D 1 =O 1 ·N 1 , and D 2 =O 2 ·N 2 , and m 1 and m 2 are a positive integer.
2. The base station of claim 1 , wherein when N 1 =4 and N 2 =2, h and v are
h=[1 e j2πm 1 /D 1 e j4πm 1 /D 1 e j6πm 1 /D 1 ] t ,
v=[1 e j2πm 2 /D 2 ] t .
3. The base station of claim 1 , wherein the number of the plurality of antenna ports is equal to 2·N 1 ·N 2 .
4. The base station of claim 1 , wherein the uplink signals further comprise Channel quality indicator (CQI) derived utilizing the one of predetermined precoding matrices.
5. The base station of claim 1 , wherein the plurality of PMIs comprise at least two indicators respectively for h and v.
6. The base station of claim 2 , wherein the plurality of PMIs are used to determine m 1 and m 2 .
7. A method for a base station (BS), the method comprising:
transmitting:
Channel State Information-Reference Signal (CSI-RS) according to a CSI-RS configuration comprising a plurality of antenna ports; and
downlink signals containing the CSI-RS configuration and a precoding-matrix-construction configuration for precoding matrix indicator (PMI) reporting on physical downlink shared channels (PDSCH), the precoding-matrix-construction configuration comprising a first and second oversampling factors, O 1 and O 2 , and a first and second numbers, N 1 and N 2 ;
receiving, from a user equipment (UE), uplink signals containing a plurality of PMIs derived using the CSI-RS according to the precoding-matrix-construction configuration; and
converting the plurality of PMIs to one of predetermined precoding matrices having a form of
[
h
⊗
v
ⅇ
j
φ
h
⊗
v
]
,
wherein φ is a co-phasing factor, and h and v are oversampled Discrete Fourier Transform (DFT) vectors of size N 1 ×1 and N 2 ×1, respectively, and
h=[1 e j2πm 1 /D 1 . . . e j2(N 1 −1)πm 1 /D 1 ] t ,
v=[1 e j2πm 2 /D 2 . . . e j2(N 2 −1)πm 1 /D 1 ] t , and
where D 1 =O 1 ·N 1 , and D 2 =O 2 ·N 2 , and m 1 and m 2 are a positive integer.
8. The method of claim 7 , wherein when N 1 =4 and N 2 =2, h and v are
h=[1 e j2πm 1 /D 1 e j4πm 1 /D 1 e j6πm 1 /D 1 ] t ,
v=[1 e j2πm 2 /D 2 ] t .
9. The method of claim 7 , wherein the number of the plurality of antenna ports is equal to 2·N 1 ·N 2 .
10. The method of claim 7 , wherein the uplink signals comprise Channel quality indicator (CQI) derived utilizing the one of predetermined precoding matrices.
11. The method of claim 7 , wherein the plurality of PMIs comprise at least two indicators respectively for h and v.
12. The method of claim 8 , wherein the plurality of PMIs are used to determine m 1 and m 2 .
13. A User Equipment (UE) capable of communicating with a base station (BS), the UE comprising:
a transceiver configured to receive:
Channel State Information-Reference Signal (CSI-RS) according to a CSI-RS configuration comprising a plurality of antenna ports; and
downlink signals containing the CSI-RS configuration and a precoding-matrix-construction configuration for precoding matrix indicator (PMI) reporting on physical downlink shared channels (PDSCH), the precoding-matrix-construction configuration comprising a first and second oversampling factors, O 1 and O 2 , and a first and second numbers, N 1 and N 2 ; and
a controller configured to:
demodulate and decode the downlink signals to obtain higher-layer configured values for the O 1 and O 2 , and the N 1 and N 2 ;
determine a plurality of PMIs derived using the CSI-RS according to the precoding-matrix-construction configuration; and
cause the transceiver to transmit, to the BS, uplink signals containing the plurality of PMIs,
wherein the plurality of PMIs correspond to one of predetermined precoding matrices having a form of
[
h
⊗
v
ⅇ
j
φ
h
⊗
v
]
,
wherein φ is a co-phasing factor, and h and v are oversampled Discrete Fourier Transform (DFT) vectors of size N 1 ×1 and N 2 ×1, respectively, and
h=[1 e j2πm 1 /D 1 . . . e j2(N 1 −1)πm 1 /D 1 ] t ,
v=[1 e j2πm 2 /D 2 . . . e j2(N 2 −1)πm 1 /D 1 ] t , and
where D 1 =O 1 ·N 1 , and D 2 =O 2 ·N 2 , and m 1 and m 2 are a positive integer.
14. The UE of claim 13 , wherein when N 1 =4 and N 2 =2, h and v are
h=[1 e j2πm 1 /D 1 e j4πm 1 /D 1 e j6πm 1 /D 1 ] t ,
v=[1 e j2πm 2 /D 2 ] t .
15. The UE of claim 13 , wherein a number of the plurality of antenna ports is equal to 2·N 1 ·N 2 .
16. The UE of claim 13 , wherein the uplink signals comprise Channel quality indicator (CQI) derived utilizing the one of predetermined precoding matrices.
17. The UE of claim 13 , wherein the plurality of PMIs comprise at least two indicators respectively for h and v.
18. The UE of claim 14 , wherein the plurality of PMIs are used to determine m 1 and m 2 .
19. A method for a User Equipment (UE) capable of communicating with a base station (BS), the method comprising:
receiving:
Channel State Information-Reference Signal (CSI-RS) according to a CSI-RS configuration comprising a plurality of antenna ports; and
downlink signals containing the CSI-RS configuration and a precoding-matrix-construction configuration for precoding matrix indicator (PMI) reporting on physical downlink shared channels (PDSCH), the precoding-matrix-construction configuration comprising a first and second oversampling factors, O 1 and O 2 , and a first and second numbers, N 1 and N 2 ;
demodulating and decoding the downlink signals to obtain higher-layer configured values for the O 1 and O 2 , and the N 1 and N 2 ;
determining a plurality of PMIs derived using the CSI-RS according to the precoding-matrix-construction configuration; and
transmitting, to the BS, uplink signals containing the plurality of PMIs,
wherein the plurality of PMIs correspond to one of predetermined precoding matrices having a form of
[
h
⊗
v
ⅇ
jφ
h
⊗
v
]
,
wherein φ is a co-phasing factor, and h and v are oversampled Discrete Fourier Transform (DFT) vectors of size N 1 ×1 and N 2 ×1, respectively, and
h=[1 e j2πm 1 /D 1 . . . e j2(N 1 −1)πm 1 /D 1 ] t ,
v=[1 e j2πm 2 /D 2 . . . e j2(N 2 −1)πm 1 /D 1 ] t , and
where D 1 =O 1 ·N 1 , and D 2 =O 2 ·N 2 , and m 1 and m 2 are a positive integer.
20. The method of claim 19 , wherein when N 1 =4 and N 2 =2, h and v are
h=[1 e j2πm 1 /D 1 e j4πm 1 /D 1 e j6πm 1 /D 1 ] t ,
v=[1 e j2πm 2 /D 2 ] t .