Method and apparatus for interference management
Methods and apparatuses for interference management in a wireless communication system. A method for operating a user equipment (UE) includes receiving configuration information about I. I is interference information for interfering N int remote radio heads (RRHs), where N int ≤N−1. The configuration information indicates a number of RRHs, N>1. The method further includes determining, based on the interference information I, a downlink (DL) spatial filter using P antenna ports, where P>1, and receiving DL data using the determined DL spatial filter.
1. A user equipment (UE) comprising:
a transceiver configured to receive configuration information about I, wherein:
I is interference information for interfering N int remote radio heads (RRHs), where N int ≤N−1, and
the configuration information indicates a number of RRHs, N>1; and
a processor operably coupled to the transceiver, the processor configured to, based on the interference information I, determine a downlink (DL) spatial filter using P antenna ports, where P>1,
wherein the transceiver is further configured to receive DL data using the determined DL spatial filter.
2. The UE of claim 1 , wherein the interference information I includes an interference covariance matrix R D for the interfering N int RRHs, where R D =Σ d=0 D−1 σ d 2 u d u d H , D is a parameter that indicates a dimension of interference subspace, and D≤P−1.
3. The UE of claim 2 , wherein:
each element of u d is decomposed into phase and amplitude components that are selected from respective codebooks,
the codebook for the phase component is an n p -bit phase-shift keying (PSK) codebook, where n p -bit PSK codebook is defined as
Φ
(
n
p
)
=
{
e
j
2
π
(
n
-
1
)
2
n
p
:
n
=
0
,
1
,
…
,
2
n
p
-
1
}
,
and
the codebook for the amplitude component is an n a -bit codebook composed of equidistant points in [0,1] in Y decibel (dB) scale.
4. The UE of claim 2 , wherein:
σ d 2 is defined based on a signal-to-interference ratio (SIR) and selected from a predefined codebook, and
the predefined codebook includes equidistant points in [a, b] in C decibel (dB) scale or is composed of non-equidistant point in [a, b].
5. The UE of claim 2 , wherein the interference information I further includes a parameter to enable or disable σ d 2 , where σ d 2 is included in I only when the parameter is set to enable.
6. The UE of claim 1 , wherein the interference information I includes multiple interference covariance matrices {R D,m } m=0 M−1 , where R D,m =Σ d=0 D−1 σ d,m 2 u d,m u d,m H, D is a parameter that indicates a dimension of interference subspace, and D≤P−1.
7. The UE of claim 6 , wherein the transceiver is further configured to receive a subset of the multiple interference covariance matrices via a medium access control-control element (MAC-CE) or downlink control information (DCI).
8. A base station (BS) comprising:
a transceiver configured to transmit configuration information about I, wherein:
I is interference information for interfering N int remote radio heads (RRHs), where N int ≤N−1, and
the configuration information indicates a number of RRHs, N>1; and
a processor operably coupled to the transceiver, the processor configured to, based on the interference information I, determine a downlink (DL) spatial filter using P antenna ports, where P>1,
wherein the transceiver is further configured to transmit DL data for reception according to the determined DL spatial filter.
9. The BS of claim 8 , wherein the interference information I includes an interference covariance matrix R D for the interfering N int RRHs, where R D =Σ d=0 D−1 σ d 2 u d u d H , D is a parameter that indicates a dimension of interference subspace, and D≤P−1.
10. The BS of claim 9 , wherein:
each element of u d is decomposed into phase and amplitude components that are selected from respective codebooks,
the codebook for the phase component is an n p -bit phase-shift keying (PSK) codebook, where n p -bit PSK codebook is defined as
Φ
(
n
p
)
=
{
e
j
2
π
(
n
-
1
)
2
n
p
:
n
=
0
,
1
,
…
,
2
n
p
-
1
}
,
and
the codebook for the amplitude component is an n a -bit codebook composed of equidistant points in [0,1] in Y decibel (dB) scale.
11. The BS of claim 9 , wherein:
σ d 2 is defined based on a signal-to-interference ratio (SIR) and selected from a predefined codebook, and
the predefined codebook includes equidistant points in [a, b] in C decibel (dB) scale or is composed of non-equidistant point in [a, b].
12. The BS of claim 9 , wherein the interference information I further includes a parameter to enable or disable σ d 2 , where σ d 2 is included in I only when the parameter is set to enable.
13. The BS of claim 8 , wherein the interference information I includes multiple interference covariance matrices {R D,m } m=0 M−1 , where R D,m =Σ d=0 D−1 σ d,m 2 u d,m u d,m H , D is a parameter that indicates a dimension of interference subspace, and D≤P−1.
14. The BS of claim 13 , wherein the transceiver is further configured to transmit a subset of the multiple interference covariance matrices via a medium access control-control element (MAC-CE) or downlink control information (DCI).
15. A method for operating a user equipment (UE), the method comprising:
receiving configuration information about I, wherein:
I is interference information for interfering N int remote radio heads (RRHs), where N int ≤N−1, and
the configuration information indicates a number of RRHs, N>1;
determining, based on the interference information I, a downlink (DL) spatial filter using P antenna ports, where P>1; and
receiving DL data using the determined DL spatial filter.
16. The method of claim 15 , wherein the interference information I includes an interference covariance matrix R D for the interfering N int RRHs, where R D =Σ d=0 D−1 σ d 2 u d u d H , D is a parameter that indicates a dimension of interference subspace, and D≤P−1.
17. The method of claim 16 , wherein:
each element of u d is decomposed into phase and amplitude components that are selected from respective codebooks,
the codebook for the phase component is an n p -bit phase-shift keying (PSK) codebook, where n p -bit PSK codebook is defined as
Φ
(
n
p
)
=
{
e
j
2
π
(
n
-
1
)
2
n
p
:
n
=
0
,
1
,
…
,
2
n
p
-
1
}
,
and
the codebook for the amplitude component is an n a -bit codebook composed of equidistant points in [0,1] in Y decibel (dB) scale.
18. The method of claim 16 , wherein:
σ d 2 is defined based on a signal-to-interference ratio (SIR) and selected from a predefined codebook, and
the predefined codebook includes equidistant points in [a, b] in C decibel (dB) scale or is composed of non-equidistant point in [a, b].
19. The method of claim 16 , wherein the interference information I further includes a parameter to enable or disable σ d 2 , where σ d 2 is included in I only when the parameter is set to enable.
20. The method of claim 15 , wherein:
the interference information I includes multiple interference covariance matrices {R D,m } m=0 M−1 , where R D,m =σ d=0 D−1 σ d,m 2 u d,m u d,m H , D is a parameter that indicates a dimension of interference subspace, and D≤P−1, and
the method further comprises receiving a subset of the multiple interference covariance matrices via a medium access control-control element (MAC-CE) or downlink control information (DCI).