US 12,732,234 B2Granted

Precoding method and apparatus, user equipment, RIS array, base station and storage medium

AssigneeBeijing Xiaomi Mobile Software Co., Ltd.

InventorsLiangang Chi, Li Yang

Life of this patent

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Abstract

A precoding method is performed by a reconfigurable intelligent surface (RIS) array. The method includes: determining incident angle information, the incident angle information including incident angle information of an incident beam transmitted by a base station to the RIS array; acquiring a precoding matrix index (PMI), the PMI being determined according to channel information between the RIS array and a user equipment (UE); determining reflection angle information corresponding to the RIS array according the PMI; and determining a target deflection phase angle of each RIS array element in the RIS array according to the incident angle information and the reflection angle information, to precode the RIS array.

Claims12

Dependent claims

A precoding method, performed by a reconfigurable intelligent surface (RIS) array, the method comprising:

determining incident angle information, the incident angle information comprising incident angle information of an incident beam transmitted by a base station to the RIS array;
acquiring a precoding matrix index (PMI), the PMI being determined according to channel information between the RIS array and a user equipment (UE);
determining reflection angle information corresponding to the RIS array according to the PMI;
and
determining a target deflection phase angle of each RIS array element in the RIS array according to the incident angle information and the reflection angle information, to precode the RIS array;
wherein determining the target deflection phase angle of each RIS array element in the RIS array according to the incident angle information and the reflection angle information comprises:
determining deflection phase angles supported by each RIS array element;
and
determining the target deflection phase angle of each RIS array element from the deflection phase angles supported by each RIS array element;
wherein determining the target deflection phase angle of each RIS array element from the deflection phase angles supported by each RIS array element comprises:
determining, among the deflection phase angles supported by each RIS array element, a deflection phase angle that minimizes a value of formula 1, as the target deflection phase angle of each RIS array element;
wherein, the formula 1 comprises:
❘
"\[LeftBracketingBar]"
ω
i
-
2
⁢
π
⁡
(
d
×
(
cos
⁡
(
α
)
+
cos
⁡
(
β
)
)
λ
)
×
i
❘
"\[RightBracketingBar]"
;
and wherein ωi is a deflection phase angle supported by an ith RIS array element, i=0, 1, . . . , N−1, N is a number of RIS array elements, d is a distance between RIS array elements, λ is a wavelength of the incident beam, α is the incident angle information, the incident angle information comprises a sum of a horizontal-dimension incident angle and a vertical-dimension incident angle of the incident beam, β is the reflection angle information, and the reflection angle information comprises the sum of the horizontal-dimension reflection angle and the vertical-dimension reflection angle corresponding to the RIS array, determined according to the PMI.

42 more elements

A precoding method, performed by a communication system comprising a base station, a reconfigurable intelligent surface (RIS) array and a user equipment (UE), the method comprising:

determining, by the UE, a precoding matrix index (PMI) according to channel information between the RIS array and the UE;
and
transmitting, by the UE, the PMI to the base station and/or the RIS array;
the method further comprises:
acquiring, by the base station, the PMI from the UE;
and
forwarding, by the base station, the PMI to the RIS array;
and
the method further comprises:
determining, by the RIS array, incident angle information, the incident angle information comprising incident angle information of an incident beam transmitted by the base station to the RIS array;
acquiring, by the RIS array, the PMI, the PMI being determined according to channel information between the RIS array and the UE;
determining reflection angle information corresponding to the RIS array according to the PMI;
and
determining a target deflection phase angle of each RIS array element in the RIS array according to the incident angle information and the reflection angle information, to precode the RIS array;
wherein determining the target deflection phase angle of each RIS array element in the RIS array according to the incident angle information and the reflection angle information comprises:
determining deflection phase angles supported by each RIS array element;
and
determining the target deflection phase angle of each RIS array element from the deflection phase angles supported by each RIS array element;
wherein determining the target deflection phase angle of each RIS array element from the deflection phase angles supported by each RIS array element comprises:
determining, among the deflection phase angles supported by each RIS array element, a deflection phase angle that minimizes a value of formula 1, as the target deflection phase angle of each RIS array element;
wherein, the formula 1 comprises:
❘
"\[LeftBracketingBar]"
ω
i
-
2
⁢
π
⁡
(
d
×
(
cos
⁡
(
α
)
+
cos
⁡
(
β
)
)
λ
)
×
i
❘
"\[RightBracketingBar]"
;
and wherein ωi is a deflection phase angle supported by an ith RIS array element, i=0, 1, . . . , N−1, N is a number of RIS array elements, d is a distance between RIS array elements, λ is a wavelength of the incident beam, α is the incident angle information, the incident angle information comprises a sum of a horizontal-dimension incident angle and a vertical-dimension incident angle of the incident beam, β is the reflection angle information, and the reflection angle information comprises the sum of the horizontal-dimension reflection angle and the vertical-dimension reflection angle corresponding to the RIS array, determined according to the PMI.

51 more elements

A communication device, comprising a processor and a memory storing a computer program, wherein the processor executes the computer program stored in the memory, to cause the communication device to perform:

determining incident angle information, the incident angle information comprising incident angle information of an incident beam transmitted by a base station to the RIS array;
acquiring a precoding matrix index (PMI), the PMI being determined according to channel information between the RIS array and a user equipment (UE);
determining reflection angle information corresponding to the RIS array according to the PMI;
and
determining a target deflection phase angle of each RIS array element in the RIS array according to the incident angle information and the reflection angle information, to precode the RIS array;
wherein determining the target deflection phase angle of each RIS array element in the RIS array according to the incident angle information and the reflection angle information comprises:
determining deflection phase angles supported by each RIS array element;
and
determining the target deflection phase angle of each RIS array element from the deflection phase angles supported by each RIS array element;
wherein determining the target deflection phase angle of each RIS array element from the deflection phase angles supported by each RIS array element comprises:
determining, among the deflection phase angles supported by each RIS array element, a deflection phase angle that minimizes a value of formula 1, as the target deflection phase angle of each RIS array element;
wherein, the formula 1 comprises:
❘
"\[LeftBracketingBar]"
ω
i
-
2
⁢
π
⁡
(
d
×
(
cos
⁡
(
α
)
+
cos
⁡
(
β
)
)
λ
)
×
i
❘
"\[RightBracketingBar]"
;
and wherein ωi is a deflection phase angle supported by an ith RIS array element, i=0, 1, . . . , N−1, N is a number of RIS array elements, d is a distance between RIS array elements, λ is a wavelength of the incident beam, α is the incident angle information, the incident angle information comprises a sum of a horizontal-dimension incident angle and a vertical-dimension incident angle of the incident beam, β is the reflection angle information, and the reflection angle information comprises the sum of the horizontal-dimension reflection angle and the vertical-dimension reflection angle corresponding to the RIS array, determined according to the PMI.

42 more elements

Dependencies are inferred from the claim text.

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Abstract

A precoding method, performed by a reconfigurable intelligent surface (RIS) array, the method comprising:

determining incident angle information, the incident angle information comprising incident angle information of an incident beam transmitted by a base station to the RIS array;
acquiring a precoding matrix index (PMI), the PMI being determined according to channel information between the RIS array and a user equipment (UE);
determining reflection angle information corresponding to the RIS array according to the PMI;
and
determining a target deflection phase angle of each RIS array element in the RIS array according to the incident angle information and the reflection angle information, to precode the RIS array;
wherein determining the target deflection phase angle of each RIS array element in the RIS array according to the incident angle information and the reflection angle information comprises:
determining deflection phase angles supported by each RIS array element;
and
determining the target deflection phase angle of each RIS array element from the deflection phase angles supported by each RIS array element;
wherein determining the target deflection phase angle of each RIS array element from the deflection phase angles supported by each RIS array element comprises:
determining, among the deflection phase angles supported by each RIS array element, a deflection phase angle that minimizes a value of formula 1, as the target deflection phase angle of each RIS array element;
wherein, the formula 1 comprises:
❘
"\[LeftBracketingBar]"
ω
i
-
2
⁢
π
⁡
(
d
×
(
cos
⁡
(
α
)
+
cos
⁡
(
β
)
)
λ
)
×
i
❘
"\[RightBracketingBar]"
;
and wherein ωi is a deflection phase angle supported by an ith RIS array element, i=0, 1, . . . , N−1, N is a number of RIS array elements, d is a distance between RIS array elements, λ is a wavelength of the incident beam, α is the incident angle information, the incident angle information comprises a sum of a horizontal-dimension incident angle and a vertical-dimension incident angle of the incident beam, β is the reflection angle information, and the reflection angle information comprises the sum of the horizontal-dimension reflection angle and the vertical-dimension reflection angle corresponding to the RIS array, determined according to the PMI.

42 more elements