Granted Patent B2

US 12,750,101 · App. 17/869,436 · Granted Sep 29, 2026

Inventors: Marcus Großmann (Erlangen, DE); Venkatesh Ramireddy (Erlangen, DE); Markus Landmann (Erlangen, DE)

Assignee: Koninklijke Philips N.V.

H04B7/0478H04B7/0626H04L5/0048

Abstract

Claims (151)

1 . A method comprising:

receiving a radio signal from a transmitter via a Multiple Input Multiple Output channel,

wherein the radio signal comprises at least one reference signal

wherein the at least one reference signal is configured according to at least one reference signal configuration,

wherein the at least one reference signal configuration is known at a receiver,

wherein the at least one reference signal configuration indicates at least one antenna port at the receiver,

wherein the at least one antenna port is associated with the at least one reference signal;

estimating the Multiple Input Multiple Output channel based on measurements on the at least one reference signal received over the at least one antenna port;

determining a precoding vector or matrix,

wherein the precoding vector or matrix is determined based on the estimated Multiple Input Multiple Output channel, on at least one vectors or at least one combinations of vectors selected from at least one port-selection codebook and on a plurality of precoding coefficients,

wherein the port-selection codebook comprises a plurality of vectors,

wherein each vector of the plurality of vectors is associated with one of the at least one antenna ports,

wherein each vector of the plurality of vectors has a first element and remaining elements,

wherein the first element is one and the remaining elements are zeros; and

reporting a feedback to the transmitter, wherein the feedback indicates the precoding vector or matrix determined by the receiver.

2 . The method of claim 1 , further comprising using at least one subbands of a transmission bandwidth for the receiving via the Multiple Input Multiple Output channel, wherein the precoding vector or matrix is identical for the at least one subbands.

3 . The method of claim 1 ,

wherein the precoding vector or matrix for each transmission layer is defined for N3 subbands or Physical Resource Blocks or frequency domain components used for Precoding Matrix Indicator reporting,

wherein the precoding vector or matrix for each transmission layer is based on at least one vector or at least one combination of vectors selected from the port-selection codebook and a delay codebook and a plurality of precoding coefficients,

wherein the delay codebook comprises D vectors,

wherein each vector from the port-selection codebook is associated with one of the at least one antenna port,

wherein each vector from the delay codebook is associated with a delay or delay index of the precoder,

wherein each vector from the delay codebook is represented by a Discrete Fourier Transform-based vector for the N3 subbands of the precoder vector or matrix,

wherein the delay codebook comprises D Discrete Fourier Transform-based vectors for the N 3 subbands,

wherein each vector is of size N3×1 and associated with a delay index,

wherein D<N3 and the delay codebook comprises the first D Discrete Fourier Transform-based vectors (a0, . . . , aD−1), or

wherein the D vectors of the delay codebook are associated with the indices ai, ∀i=0, . . . , D−1 from the delay codebook comprises N3 Discrete Fourier Transform-based vectors,

wherein ai=mod(as+i, N3), ∀i=0, . . . , D−1,

wherein as is the starting index of the vector from the delay codebook, wherein the delay codebook comprises the D vectors (a mod(as+0,N3), . . . a mod(as+D−1,N3)).

4 . The method of claim 3 , wherein the parameter D represents the number of Discrete Fourier Transform-based vectors of the delay codebook configured to the UE from the network node, or fixed by a specification and known by the receiver.

5 . The method of claim 3 ,

wherein the precoding vector for a transmission layer is based on L vectors selected from the port-selection codebook and a portion of vectors selected from the delay codebook,

wherein the portion is equal or less than D.

6 . The method of claim 1 ,

wherein the feedback indicates the precoding coefficients determined by the receiver,

wherein the receiver is arranged to decompose each precoder coefficient in at least one amplitude coefficient and a phase coefficient.

7 . The method of claim 6 , wherein the feedback comprises a quantized value of the first amplitude coefficient, a quantized value of the second amplitude coefficient and a quantized value of the phase coefficient for each determined precoder coefficient.

8 . The method of claim 7 , wherein an amplitude coefficient reported if the precoder coefficient or the amplitude coefficient is non-zero.

9 . The method of claim 6 ,

wherein the feedback comprises a quantized value of a first amplitude coefficient, a quantized value of a second amplitude coefficient, a quantized value of a third amplitude coefficient and a quantized value of the phase coefficient for each determined precoder coefficient,

wherein the first amplitude is not reported,

wherein the second amplitude coefficients are common for all ports l,

wherein the second first amplitude coefficient is reported for each delay index d (d=O, . . . , D−1),

wherein the third amplitude coefficient is reported for each precoder coefficient, the second amplitude coefficients are common for all delays d, and the second amplitude coefficient is reported per port index l (l=0, . . . , L−1) and the third amplitude coefficient is reported per precoder coefficient.

10 . The method of claim 1 ,

wherein the feedback indicates precoding coefficients determined by the receiver,

wherein the indicated precoding coefficients are not equal to zero.

11 . The method of claim 1 , wherein the feedback is selected from the group consisting of a Channel State Information, CSI, feedback, Precoder Matrix Indicator, and a Precoder Matrix Indicator/Rank Indicator.

12 . The method of claim 1 ,

wherein each of the at least one antenna port in the at least one reference signal configuration is precoded or beamformed,

wherein each of the at least one antenna port in the at least one reference signal configuration is associated with a spatial beam and a delay.

13 . The method of claim 1 , further comprising:

acquiring uplink channel sounding measurements so as to acquire angular or spatial information and delay information, and

utilizing the acquired angular or spatial information and delay information for precoding or beamforming a plurality of at least one reference signal resources used for the channel measurements and feedback calculations at the receiver.

14 . A computer program stored on a non-transitory medium,

wherein the computer program when executed on a processor performs the method as claimed in claim 1 .

15 . The method of claim 1 , wherein the receiver is to indicate L ports by a

⌈

log

2

(

P

/

2

L

)

⌉

combinatorial bit-indicator, with L denoting a number of ports over two polarizations of P of the at least one antenna port.

16 . The method of claim 6 ,

wherein the feedback comprises a quantized value of a first amplitude coefficient, a quantized value of a second amplitude coefficient, a quantized value of a third amplitude coefficient and a quantized value of the phase coefficient for each determined precoder coefficient,

wherein the first amplitude is not reported,

wherein the second amplitude coefficients are common for all delays d (d=O, . . . , D−1),

wherein the second amplitude coefficient is reported for each port index l (l=0, . . . , L−1),

wherein the third amplitude coefficient is reported for each precoder coefficient.

17 . A receiver comprising:

a receiver circuit,

wherein the receiver circuit is arranged to receive a radio signal via a Multiple Input Multiple Output channel,

wherein the radio signal comprises at least one reference signal

wherein the at least one reference signal is configured according to at least one reference signal configuration,

wherein the at least one reference signal configuration is known at a receiver,

wherein the at least one reference signal configuration indicates at least one antenna port at the receiver,

wherein the at least one reference signal configuration indicates at least one associated with the at least one reference signal; and

a processor circuit and a memory circuit, wherein the memory is arranged to store instructions for the processor circuit,

wherein the processor circuit is arranged to estimate the Multiple Input Multiple Output channel based on measurements on the at least one reference signal received over the at least one antenna port,

wherein the processor circuit is arranged to determine a precoding vector or matrix so as to achieve a predefined property for a communication over the Multiple Input Multiple Output channel,

wherein the precoding vector or matrix is determined based on the estimated Multiple Input Multiple Output channel using at least one port-selection codebook and a plurality of precoding coefficients,

wherein the port-selection codebook comprises a plurality of vectors

wherein each vector of the plurality of vectors is associated with one of the at least one antenna port,

wherein each vector of the plurality of vectors has a first element and remaining elements,

wherein the first element is one and the remaining elements are zeros; and

wherein the processor circuit is arranged to report a feedback to a transmitter,

wherein the feedback indicates the precoding vector or matrix determined by the receiver.

18 . The receiver of claim 17 ,

wherein the processor circuit is arranged to use at least one subbands of a transmission bandwidth for the receiving via the Multiple Input Multiple Output channel,

wherein the precoding vector or matrix is identical for the at least one subbands.

19 . The receiver of claim 17 ,

wherein the precoding vector or matrix for each transmission layer is defined for N3 subbands or Physical Resource Blocks or frequency domain components used for Precoding Matrix Indicator reporting,

wherein the precoding vector or matrix for each transmission layer is based on at least one vector or at least one combination of vectors selected from the port-selection codebook and a delay codebook and a plurality of precoding coefficients,

wherein the delay codebook comprises D vectors,

wherein each vector from the port-selection codebook is associated with one of the at least one antenna ports,

wherein each vector from the delay codebook is associated with a delay or delay index of the precoder,

wherein each vector from the delay codebook is represented by a Discrete Fourier Transform-based vector for the N3 subbands of the precoder vector or matrix,

wherein the delay codebook comprises D Discrete Fourier Transform-based vectors for the N3 subbands,

wherein each vector is of size N3×1 and associated with a delay index,

wherein D<N3 and the delay codebook comprises the first D Discrete Fourier Transform-based vectors (a0, . . . , aD−1), or

wherein the D vectors of the delay codebook are associated with the indices ai, ∀i=0, . . . , D−1 from the delay codebook comprises N3 Discrete Fourier Transform-based vectors,

wherein ai=mod(as+i, N3), ∀i=0, . . . , D−1,

wherein as is the starting index of the vector from the delay codebook, wherein the delay codebook comprises the D vectors (a mod(as+0,N3), . . . a mod(as+D−1,N3)).

20 . The receiver of claim 19 , wherein the parameter D represents the number of Discrete Fourier Transform-based vectors of the delay codebook configured to the UE from the network node, or fixed by a specification and known by the receiver.

21 . The receiver of claim 19 ,

wherein the precoding vector for a transmission layer is based on L vectors selected from the port-selection codebook and a portion of vectors selected from the delay codebook,

wherein the portion is equal or less than D.

22 . The receiver of claim 17 ,

wherein the feedback indicates the precoding coefficients determined by the receiver,

wherein the receiver is arranged to decompose each precoder coefficient in at least one amplitude coefficient and a phase coefficient.

23 . The receiver of claim 22 , wherein the feedback comprises a quantized value of the first amplitude coefficient, a quantized value of the second amplitude coefficient and a quantized value of the phase coefficient for each determined precoder coefficient.

24 . The receiver of claim 23 , wherein an amplitude coefficient reported if the precoder coefficient or the amplitude coefficient is non-zero.

25 . The receiver of claim 22 ,

wherein the feedback comprises a quantized value of a first amplitude coefficient, a quantized value of a second amplitude coefficient, a quantized value of a third amplitude coefficient and a quantized value of the phase coefficient for each determined precoder coefficient,

wherein the first amplitude is not reported,

wherein the second amplitude coefficients are common for all ports l,

wherein the second first amplitude coefficient is reported for each delay index d (d=O, . . . , D−1),

wherein the third amplitude coefficient is reported for each precoder coefficient.

26 . The receiver of claim 22 ,

wherein the feedback comprises a quantized value of a first amplitude coefficient, a quantized value of a second amplitude coefficient, a quantized value of a third amplitude coefficient and a quantized value of the phase coefficient for each determined precoder coefficient,

the first amplitude is not reported,

wherein the second amplitude coefficients are common for all delays d (d=O, . . . , D−1),

wherein the second amplitude coefficient is reported for each port index l (l=0, . . . , L−1),

wherein the third amplitude coefficient is reported for each precoder coefficient.

27 . The receiver of claim 17 ,

wherein the feedback indicates precoding coefficients determined by the processor circuit,

wherein the indicated precoding coefficients are not equal to zero.

28 . The receiver of claim 17 , wherein the feedback is selected from the group consisting of a Channel State Information, CSI, feedback, Precoder Matrix Indicator, and a Precoder Matrix Indicator/Rank Indicator.

29 . The receiver of claim 17 ,

wherein each of the at least one antenna port in the at least one reference signal configuration is precoded or beamformed,

wherein each of the at least one antenna port in the at least one reference signal configuration is associated with a spatial beam and a delay.

30 . The receiver of claim 17 ,

wherein the processor circuit is arranged to acquire uplink channel sounding measurements so as to acquire angular or spatial information and delay information, and

wherein the processor circuit is arranged to utilize the acquired angular or spatial information and delay information for precoding or beamforming a plurality of at least one reference signal resources used for the channel measurements and feedback calculations at the receiver.

31 . The receiver of claim 17 , wherein the processor circuit is arranged to indicate L ports by a

[

log

2

(

P

/

2

L

)

]

combinatorial bit-indicator, with L denoting a number of ports over two polarizations of P of the at least one antenna ports.

Assignments (4)

Priority Claims (2)

Continuity (2)

References Cited (34)