Method and apparatus for high rand CSI reporting in wireless communications systems
A method for operating a user equipment (UE) for channel state information (CSI) feedback in a wireless communication system comprises receiving, from a base station (BS), CSI feedback configuration information including two parameters (p 0 , p 1 ) for determining a set of M basis vectors, the first parameter (p 0 ) is for a first rank set and the second parameter (p 1 ) is for a second rank set; generating a CSI feedback based on the CSI feedback configuration information, the CSI feedback generated for a rank value v from one of the first and second rank sets and the CSI feedback includes the set of M basis vectors, M is determined based on the (p 0 ) if the rank value v belongs to the first rank set and based on the (p 1 ) if the rank value v belongs to the second rank set; and transmitting, to the BS, the CSI feedback over an uplink channel.
1. A user equipment (UE) in a wireless communication system, the UE comprising:
a transceiver configured to receive, from a base station (BS), channel state information (CSI) feedback configuration information including a single parameter for indicating at least one of a first parameter (p 0 ) and a second parameter (p 1 ) for determining a set of M basis vectors, wherein the first parameter (p 0 ) is for a first rank set and the second parameter (p 1 ) is for a second rank set; and
a processor operably connected to the transceiver, the processor configured to obtain a CSI feedback based on the CSI feedback configuration information, wherein the CSI feedback is associated with a rank value υ from one of the first and second rank sets and with the set of M basis vectors, where M is determined based on the first parameter (p 0 ) if the rank value υ belongs to the first rank set and based on the second parameter (p 1 ) if the rank value υ belongs to the second rank set,
wherein the transceiver is further configured to transmit the CSI feedback over an uplink channel.
2. The UE of claim 1 , wherein the first rank set comprises rank values {1,2} and the second rank set comprises rank values {3,4}.
3. The UE of claim 1 , wherein the first parameter indicated by the single parameter is larger than or equal to the second parameter indicated by the single parameter.
4. The UE of claim 1 , wherein a set of values of the first and second parameters (p 0 , p 1 ) includes:
(p 0 , p 1 )=(½, ¼);
(p 0 , p 1 )=(¼, ⅛);
(p 0 , p 1 )=(¼, ¼).
5. The UE of claim 1 , wherein M corresponds to a following equation:
M
=
⌈
p
×
N
3
R
⌉
where:
p is one of p 0 and p 1 ,
┌ ┐ is a ceiling function,
N 3 is a total number of frequency domain (FD) units, and
R is a number of FD units in each subband configured for the CSI feedback.
6. A base station (BS) in a wireless communication system, the BS comprising:
a processor configured to obtain CSI feedback configuration information including a single parameter for indicating at least one of a first parameter (p 0 ) and a second parameter (p 1 ) for determining a set of M basis vectors, wherein the first parameter (p 0 ) is for a first rank set and the second parameter (p 1 ) is for a second rank set; and
a transceiver operably connected to the processor, the transceiver configured to:
transmit, to a user equipment (UE), the CSI feedback configuration information, and
receive, from the UE over an uplink channel, a CSI feedback associated with a rank value v from one of the first and second rank sets and with the set of M basis vectors, where M is determined based on the first parameter (p 0 ) if the rank value υ belongs to the first rank set and based on the second parameter (p 1 ) if the rank value υ belongs to the second rank set.
7. The BS of claim 6 , wherein the first rank set comprises rank values {1,2} and the second rank set comprises rank values {3,4}.
8. The BS of claim 6 , wherein the first parameter indicated by the single parameter is larger than or equal to the second parameter indicated by the single parameter.
9. The BS of claim 6 , wherein a set of values of the first and second parameters (p 0 , p 1 ) includes:
(p 0 , p 1 )=(½, ¼);
(p 0 , p 1 )=(¼, ⅛);
(p 0 , p 1 )=(¼, ¼).
10. The BS of claim 6 , wherein M corresponds to a following equation:
M
=
⌈
p
×
N
3
R
⌉
where:
p is one of p 0 and p 1 ,
┌ ┐ is a ceiling function,
N 3 is a total number of frequency domain (FD) units, and
R is a number of FD units in each subband configured for the CSI feedback.
11. A method for operating a user equipment (UE) in a wireless communication system, the method comprising:
receiving, from a base station (BS), channel state information (CSI) feedback configuration information including a single parameter for indicating at least one of a first parameter (p 0 ) and a second parameter (p 1 ) for determining a set of M basis vectors, wherein the first parameter (p 0 ) is for a first rank set and the second parameter (p 1 ) is for a second rank set;
obtaining a CSI feedback based on the CSI feedback configuration information,
wherein the CSI feedback is associated with a rank value υ from one of the first and second rank sets and with the set of M basis vectors, where M is determined based on the first parameter (p 0 ) if the rank value υ belongs to the first rank set and based on the second parameter (p 1 ) if the rank value υ belongs to the second rank set; and
transmitting, to the BS, the CSI feedback over an uplink channel.
12. The method of claim 11 , wherein the first rank set comprises rank values {1,2} and the second rank set comprises rank values {3,4}.
13. The method of claim 11 , wherein the first parameter indicated by the single parameter is larger than or equal to the second parameter indicated by the single parameter.
14. The method of claim 11 , wherein a set of values of the first and second parameters (p 0 , p 1 ) includes:
(p 0 , p 1 )=(½, ¼);
(p 0 , p 1 )=(¼, ⅛);
(p 0 , p 1 )=(¼, ¼).
15. The method of claim 11 , wherein M corresponds to a following equation:
M
=
⌈
p
×
N
3
R
⌉
where:
p is one of p 0 and p 1 ,
┌ ┐ is a ceiling function,
N 3 is a total number of frequency domain (FD) units, and
R is a number of FD units in each subband configured for the CSI feedback.
16. A method for operating a base station (BS) in a wireless communication system, the method comprising:
obtaining channel state information (CSI) feedback configuration information including a single parameter for indicating at least one of first parameter (p 0 ) and a second parameter (p 1 ) for determining a set of M basis vectors, wherein the first parameter (p 0 ) is for a first rank set and the second parameter (p 1 ) is for a second rank set;
transmitting, to a user equipment (UE), the CSI feedback configuration information; and
receiving, from the UE over an uplink channel, a CSI feedback associated with a rank value υ from one of the first and second rank sets and with the set of M basis vectors, where M is determined based on the first parameter (p 0 ) if the rank value υ belongs to the first rank set and based on the second parameter (p 1 ) if the rank value υ belongs to the second rank set.
17. The method of claim 16 , wherein the first rank set comprises rank values {1,2} and the second rank set comprises rank values {3,4}.
18. The method of claim 16 , wherein the first parameter indicated by the single parameter is larger than or equal to the second parameter indicated by the single parameter.
19. The method of claim 16 , wherein a set of values of the first and second parameters (p 0 , p 1 ) includes:
(p 0 , p 1 )=(½, ¼);
(p 0 , p 1 )=(¼, ⅛);
(p 0 , p 1 )=(¼, ¼).
20. The method of claim 16 , wherein M corresponds to a following equation:
M
=
⌈
p
×
N
3
R
⌉
where:
p is one of p 0 and p 1 ,
┌ ┐ is a ceiling function,
N 3 is a total number of frequency domain (FD) units, and
R is a number of FD units in each subband configured for the CSI feedback.