METHOD AND APPARATUS FOR WIDEBAND CSI REPORTING IN AN ADVANCED WIRELESS COMMUNICATION SYSTEM

• US 20190253181A1
• Filed: 02/04/2019
• Published: 08/15/2019
• Est. Priority Date: 02/09/2018
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Rahman, Md Saifur, Wang, Yuyang, Onggosanusi, Eko
• Granted Patent: US 10,644,828 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 17/309 Measuring or estimating channel quality parameters
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04L 1/0008 by supplementing frame payload, e.g. with padding bits
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0028 Formatting

Abstract

A method of a user equipment (UE) in a wireless communication system is provided. The method comprises receiving, from a base station (BS), channel status information (CSI) configuration information for a wideband CSI (WB CSI), generating the WB CSI based on the CSI configuration information, determining a number of zero padding bits (N) based on the CSI configuration information, wherein the number of zero padding bits (N) is determined based on a maximum payload bits (N_max) over all WB CSI candidates and an actual payload bits (N_reported) for the generated WB CSI, generating an appended WB CSI by inserting N consecutive zero bits into the actual payload bits (N_reported) for the generated WB CSI, and transmitting, to the BS, the appended WB CSI over an uplink channel.

Claims

1. A user equipment (UE) in a wireless communication system, the UE comprising:

a transceiver configured to receive, from a base station (BS), channel status information (CSI) configuration information for a wideband CSI (WB CSI); and

a processor operably connected to the transceiver, the processor configured to;

generate the WB CSI based on the CSI configuration information;

determine a number of zero padding bits (N) based on the CSI configuration information, wherein the number of zero padding bits (N) is determined based on a maximum payload bits (N_max) over all WB CSI candidates and an actual payload bits (N_reported) for the generated WB CSI; and

generate an appended WB CSI by inserting N consecutive zero bits into the actual payload bits (N_reported) for the generated WB CSI,

wherein the transceiver is further configured to transmit, to the BS, the appended WB CSI over an uplink channel.

2. The UE of claim 1, wherein a number of payload bits varies across WB CSI candidates.

3. The UE of claim 1, wherein the number of zero padding bits (N) is determined by N=N_max−

N_reported.

4. The UE of claim 3, wherein:

the actual payload bits (N_reported) is determined by N_reported=B (R) where R=reported rank; and

the maximum payload bits (N_max) is determined by N_max=max<sub>r∈

SRank</sub>B(r) where S_Rank=set of rank values (r) that are allowed to be reported.

5. The UE of claim 4, wherein the B(r) is determined by:

B(r)=N_PMI(r)+N_CQI(r)+N_LI(r) for 2 CSI reference signal (CSI-RS) ports; and

B(r)=N_{PMI i1}(r)+N_{PMI i2}(r)+N_CQI(r)+N_LI(r) for more than 2 CSI-RS ports.

6. The UE of claim 5, wherein:

a number of bits of payload N_PMI is determined as N_PMI(1)=2 and N_PMI (2)=1 when a precoding matric indicator (PMI) is reported to the BS, and the number of bits of payload N_PMI is determined as N_PMI(r)=0 when the PMI is not reported to the BS;

a number of bits of payload N_{PMI i1} is determined as N_{PMI i1}(r)=number of bits to report PMI components that are reported in a WB manner, when a PMI i1 is reported to the BS, and the number of bits of payload N_{PMI i1} is determined as N_{PMI i1}(r)=0 when the PMI i1 is not reported to the BS;

a number of bits of payload N_{PMI i2} is determined as N_{PMI i2}(r)=number of bits to report PMI components that can be reported in either WB or subband (SB) manner, when a PMI i2 is reported to the BS, and the number of bits of payload N_{PMI i2} is determined as N_{PMI i2}(r)=0 when the PMI i2 is not reported to the BS;

a number of bits of payload N_CQI(r) is determined as 4 if R≤

4 and 8 if R>

4 when channel quality information (CQI) is reported to the BS, and a number of bits of payload N_CQI(r) is determined as N_CQI(r)=0 when the CQI is not reported to the BS; and

a number of bits of payload N_LI(r) is determined as ┌

log₂ R┐

for 2 CSI-RS ports and min (2, ┌

log₂ R┐

) for more than 2 CSI-RS ports, when a layer indicator (LI) is reported to the BS, and the number of bits of payload N_LI(r) is determined as N_LI(r)=0 when the LI is not reported to the BS.

7. The UE of claim 1, wherein:

the WB CSI includes all or a subset of CSI-RS resource indicator (CRI), rank indicator (RI), layer indicator (LI), precoding matrix indicator (PMI), and CQI for 2 CSI-RS ports and all or a subset of CRI, RI, LI, PMI i1, PMI i2, and CQI for more than 2 CSI-RS ports; and

the N consecutive zero bits are inserted between the payload bits for a first set and a second set for 2 CSI-RS ports and between the payload bits for the first set and a third set for more than 2 CSI-RS ports, and wherein;

the first set comprises CRI, RI, and LI;

the second set comprises PMI and CQI; and

the third set comprises PMI i1, PMI i2, and CQI.

8. A base station (BS) in a wireless communication system, the BS comprising:

a transceiver configured to;

transmit, to a user equipment (UE), channel status information (CSI) configuration information for a wideband CSI (WB CSI); and

receive, from the UE, an appended WB CSI over an uplink channel, wherein the appended WB CSI is generated by inserting N consecutive zero bits into actual payload bits (N_reported) for the WB CSI that is generated based on the CSI configuration information, and wherein a number of zero padding bits (N) is determined based on a maximum payload bits (N_max) over all WB CSI candidates and the actual payload bits (N_reported) for the generated WB CSI.

9. The BS of claim 8, wherein a number of payload bits varies across WB CSI candidates.

10. The BS of claim 8, wherein the number of zero padding bits (N) is determined by N=N_max−

N_reported.

11. The BS of claim 10, wherein:

the actual payload bits (N_reported) is determined by N_reported=B (R) where R=reported rank; and

the maximum payload bits (N_max) is determined by N_max=max<sub>r∈

SRank</sub> B(r) where S_Rank=set of rank values (r) that are allowed to be reported.

12. The BS of claim 11, wherein the B(r) is determined by:

B(r)=N_PMI(r)+N_CQI(r)+N_LI(r) for 2 CSI reference signal (CSI-RS) ports; and

B(r)=N_{PMI i1}(r)+N_{PMI i2}(r)+N_CQI(r)+N_LI(r) for more than 2 CSI-RS ports.

13. The BS of claim 12, wherein:

a number of bits of payload N_PMI is determined as N_PMI(1)=2 and N_PMI (2)=1 when a precoding matric indicator (PMI) is reported to the BS, and the number of bits of payload N_PMI is determined as N_PMI(r)=0 when the PMI is not reported to the BS;

a number of bits of payload N_{PMI i1} is determined as N_{PMI i1}(r)=number of bits to report PMI components that are reported in a WB manner, when a PMI i1 is reported to the BS, and the number of bits of payload N_{PMI i1} is determined as N_{PMI i1}(r)=0 when the PMI i1 is not reported to the BS;

a number of bits of payload N_{PMI i2} is determined as N_{PMI i2}(r)=number of bits to report PMI components that can be reported in either WB or subband (SB) manner, when a PMI i2 is reported to the BS, and the number of bits of payload N_{PMI i2} is determined as N_{PMI i2}(r)=0 when the PMI i2 is not reported to the BS;

a number of bits of payload N_CQI(r) is determined as 4 if R≤

4 and 8 if R>

4 when channel quality information (CQI) is reported to the BS, and a number of bits of payload N_CQI(r) is determined as N_CQI(r)=0 when the CQI is not reported to the BS; and

a number of bits of payload N_LI(r) is determined as ┌

log₂ R┐

for 2 CSI-RS ports and min(2, ┌

log₂ R┐

) for more than 2 CSI-RS ports, when a layer indicator (LI) is reported to the BS, and the number of bits of payload N_LI(r) is determined as N_LI(r)=0 when the LI is not reported to the BS.

14. The BS of claim 8, wherein:

the WB CSI includes all or a subset of CSI-RS resource indicator (CRI), rank indicator (RI), layer indicator (LI), precoding matrix indicator (PMI), and CQI for 2 CSI-RS ports and all or a subset of CRI, RI, LI, PMI i1, PMI i2, and CQI for more than 2 CSI-RS ports; and

the N consecutive zero bits are inserted between the payload bits for a first set and a second set for 2 CSI-RS ports and between the payload bits for the first set and a third set for more than 2 CSI-RS ports, and wherein;

the first set comprises CRI, RI, and LI;

the second set comprises PMI and CQI; and

the third set comprises PMI i1, PMI i2, and CQI.

15. A method of a user equipment (UE) in a wireless communication system, the method comprising:

receiving, from a base station (BS), channel status information (CSI) configuration information for a wideband CSI (WB CSI);

generating the WB CSI based on the CSI configuration information;

determining a number of zero padding bits (N) based on the CSI configuration information, wherein the number of zero padding bits (N) is determined based on a maximum payload bits (N_max) over all WB CSI candidates and an actual payload bits (N_reported) for the generated WB CSI;

generating an appended WB CSI by inserting N consecutive zero bits into the actual payload bits (N_reported) for the generated WB CSI; and

transmitting, to the BS, the appended WB CSI over an uplink channel.

16. The method of claim 15, wherein:

a number of payload bits varies across WB CSI candidates; and

the number of zero padding bits (N) is determined by N=N_max−

N_reported.

17. The method of claim 16, wherein:

the actual payload bits (N_reported) is determined by N_reported=B (R) where R=reported rank; and

the maximum payload bits (N_max) is determined by N_max=max<sub>r∈

SRank</sub> B(r) where S_Rank=set of rank values (r) that are allowed to be reported.

18. The method of claim 17, wherein the B(r) is determined by:

B(r)=N_PMI(r)+N_CQI(r)+N_LI(r) for 2 CSI reference signal (CSI-RS) ports; and

B(r)=N_{PMI i1}(r)+N_{PMI i2}(r)+N_CQI(r)+N_LI(r) for more than 2 CSI-RS ports.

19. The method of claim 18, wherein:

a number of bits of payload N_PMI is determined as N_PMI(1)=2 and N_PMI (2)=1 when a precoding matric indicator (PMI) is reported to the BS, and the number of bits of payload N_PMI is determined as N_PMI(r)=0 when the PMI is not reported to the BS;

a number of bits of payload N_{PMI i1} is determined as N_{PMI i1}(r)=number of bits to report PMI components that are reported in a WB manner, when a PMI it is reported to the BS, and the number of bits of payload N_{PMI i1} is determined as N_{PMI i1}(r)=0 when the PMI i1 is not reported to the BS;

a number of bits of payload N_{PMI i2} is determined as N_{PMI i2}(r)=number of bits to report PMI components that can be reported in either WB or subband (SB) manner, when a PMI i2 is reported to the BS, and the number of bits of payload N_{PMI i2} is determined as N_{PMI i2}(r)=0 when the PMI i2 is not reported to the BS;

a number of bits of payload N_CQI(r) is determined as 4 if R≤

4 and 8 if R>

4 when channel quality information (CQI) is reported to the BS, and a number of bits of payload N_CQI(r) is determined as N_CQI(r)=0 when the CQI is not reported to the BS; and

a number of bits of payload N_LI(r) is determined as ┌

log₂R┐

for 2 CSI-RS ports and min(2, ┌

log₂ R┐

) for more than 2 CSI-RS ports, when a layer indicator (LI) is reported to the BS, and the number of bits of payload N_LI(r) is determined as N_LI(r)=0 when the LI is not reported to the BS.

20. The method of claim 15, wherein:

the WB CSI includes all or a subset of CSI-RS resource indicator (CRI), rank indicator (RI), layer indicator (LI), precoding matrix indicator (PMI), and CQI for 2 CSI-RS ports and all or a subset of CRI, RI, LI, PMI i1, PMI i2, and CQI for more than 2 CSI-RS ports; and

the N consecutive zero bits are inserted between the payload bits for a first set and a second set for 2 CSI-RS ports and between the payload bits for the first set and a third set for more than 2 CSI-RS ports, and wherein;

the first set comprises CRI, RI, and LI;

the second set comprises PMI and CQI; and

the third set comprises PMI i1, PMI i2, and CQI.