Granted Patent B1

US 12,250,039 · App. 18/802,443 · Granted Mar 11, 2025

Inventors: Bala Venkata Ramulu Gorantla (Bangalore, IN); Suresh Kalyanasundaram (Bangalore, IN); Shalini Gulati (Bangalore, IN)

Assignee: Nokia Solutions and Networks Oy

H04B7/0617H04L5/0051H04W24/10

Abstract

Claims (88)

1. An apparatus for a communication system, the apparatus comprising:

at least one processor, and

at least one memory storing instructions that, when executed by the at least one processor cause the processor to:

determine a first measurement (RS-M- 1 ) of first reference signals associated with a first analog beam used to receive the first reference signals (RS- 1 ),

determine a second measurement (RS-M- 2 ) of second reference signals (RS- 2 ) associated with a second analog beam used to receive the second reference signals (RS- 2 ),

determine first information (I- 1 ) characterizing a digital beamformer (DBF) based on the first measurement (RS-M- 1 ) and the second measurement (RS-M- 2 ), wherein the instructions when executed by the at least one processor, cause the apparatus to:

determine a measurement vector (MV) characterizing the first and second reference signals (RS- 1 , RS- 2 ) based on the first measurement (RS-M- 1 ) and the second measurement (RS-M- 2 ),

determine a first covariance matrix (CV-M- 1 ) based on the measurement vector (MV),

determine a second covariance matrix (CV-M- 2 ), which is associated with at least one of the first analog beam and the second analog beam, based on first covariance matrix (CV-M- 1 ),

determine the first information (I- 1 ) characterizing the digital beamformer (DBF) based on the second covariance matrix (CV-M- 2 ),

perform digital beamforming using the digital beamformer (DBF) in a first direction (DIR- 1 ), and

perform analog beamforming in a second direction (DIR- 2 ), which is different from the first direction.

2. The apparatus according to claim 1 , wherein the first measurement (RS-M- 1 ) and the second measurement (RS-M- 2 ) are consecutive measurements.

3. The apparatus according to claim 1 , wherein the instructions, when executed by the at least one processor, cause the apparatus to perform at least one of:

determining the measurement vector (MV) in accordance with Z SRS =(w H w) −1 w H y, wherein Z SRS characterizes the measurement vector (MV), wherein

y

=

[

y

i

y

k

]

,

wherein y i characterizes the first measurement (RS-M- 1 ) of the first reference signals (RS- 1 ) associated with the first analog beam, wherein y k characterizes the second measurement (RS-M- 2 ) of the second reference signals (RS- 2 ) associated with the second analog beam, wherein

w

=

[

w

i

w

k

]

wherein w i characterizes a weight matrix associated with the first analog beam, wherein w k characterizes a weight matrix associated with the second analog beam, wherein w H is the conjugate transpose of w, wherein ( ) −1 characterizes a matrix inversion,

determining the first covariance matrix (CV-M- 1 ) based on the measurement vector (MV) in accordance with: R zz =Z SRS Z SRS H , wherein R zz characterizes the first covariance matrix (CV-M- 1 ), determining the second covariance matrix (CV-M- 2 ) based on first covariance matrix (CV-M- 1 ) in accordance with:

R

y

i

⁢

y

i

=

w

i

⁢

R

z

⁢

z

⁢

w

i

H

,

wherein R y i y i characterizes the covariance matrix (CV-M- 2 ) associated with at least the one of the first analog beam and the second analog beam.

4. The apparatus according to claim 1 ,

wherein the instructions, when executed by the at least one processor, cause the apparatus to perform at least one of:

determining, based on the first information (I- 1 ), a digital beam (DIG-B) for exchanging, for example transmitting and/or receiving, signals,

exchanging, for example transmitting and/or receiving, signals using the digital beam (DIG-B), updating the digital beam (DIG-B).

5. The apparatus according to claim 1 , wherein the instructions, when executed by the at least one processor, cause the apparatus to:

determine an estimate (EST-MV) of a measurement vector based on the first measurement (RS-M- 1 ) and the second measurement (RS-M- 2 ),

determine a first covariance matrix (CV-M- 1 -EST-MV) for the estimate (EST-MV) based on the estimate (EST-MV),

determine a second covariance matrix (CV-M- 2 -EST-MV) related to the estimate (EST-MV), which is associated with one of the first analog beam and the second analog beam, based on the first covariance matrix (CV-M- 1 -EST-MV) for the estimate (EST-MV).

6. The apparatus according to claim 5 , wherein the instructions, when executed by the at least one processor, cause the apparatus to perform at least one of:

determining an accuracy (ACC-EST-MV) of the estimate (EST-MV) of the measurement vector,

determining an accuracy (ACC- 2 -EST-MV) of the second covariance matrix (CV-M- 2 -EST-MV) related to the estimate (EST-MV).

7. A terminal device for a communication system comprising at least one apparatus according to claim 1 .

8. An apparatus for a communication system, the apparatus comprising:

means for determining a first measurement (RS-M- 1 ) of first reference signals (RS- 1 ) associated with a first analog beam used to receive the first reference signals (RS- 1 ),

means for determining a second measurement (RS-M- 2 ) of second reference signals (RS- 2 ) associated with a second analog beam used to receive the second reference signals (RS- 2 ),

means for determining first information (I- 1 ) characterizing a digital beamformer (DBF) based on the first measurement (RS-M- 1 ) and the second measurement (RS-M- 2 ),

means for determining a measurement vector (MV) characterizing the first and second reference signals (RS- 1 , RS- 2 ) based on the first measurement (RS-M- 1 ) and the second measurement (RS-M- 2 ),

means for determining a first covariance matrix (CV-M- 1 ) based on the measurement vector (MV),

means for determining a second covariance matrix (CV-M- 2 ), which is associated with at least one of the first analog beam and the second analog beam, based on first covariance matrix (CV-M- 1 ),

means for determining the first information (I- 1 ) characterizing the digital beamformer (DBF) based on the second covariance matrix (CV-M- 2 ),

means for performing digital beamforming using the digital beamformer (DBF) in a first direction (DIR- 1 ), and

means performing analog beamforming in a second direction (DIR- 2 ), which is different from the first direction.

9. A network device for a communication system comprising at least one apparatus according to claim 8 .

10. A method for a communication system, comprising:

determining a first measurement (RS-M- 1 ) of first reference signals (RS- 1 ) associated with a first analog beam used to receive the first reference signals (RS- 1 ),

determining a second measurement (RS-M- 2 ) of second reference signals (RS- 2 ) associated with a second analog beam used to receive the second reference signals (RS- 2 ),

determining first information (I- 1 ) characterizing a digital beamformer (DBF) based on the first measurement (RS-M- 1 ) and the second measurement (RS-M- 2 ), wherein the method further comprises:

determining a measurement vector (MV) characterizing the first and second reference signals (RS- 1 , RS- 2 ) based on the first measurement (RS-M- 1 ) and the second measurement (RS-M- 2 ),

determining a first covariance matrix (CV-M- 1 ) based on the measurement vector (MV),

determining a second covariance matrix (CV-M- 2 ), which is associated with at least one of the first analog beam and the second analog beam, based on first covariance matrix (CV-M- 1 ),

determining the first information (I- 1 ) characterizing the digital beamformer (DBF) based on the second covariance matrix (CV-M- 2 ),

performing digital beamforming using the digital beamformer (DBF) in a first direction (DIR- 1 ), and

performing analog beamforming in a second direction (DIR- 2 ), which is different from the first direction.

Assignments (2)

Priority Claims (1)

References Cited (23)