RIS capability reporting
Methods and apparatuses for RIS capability reporting are disclosed. A method at an RIS device comprises transmitting RIS capability including at least the number of elements in a vertical direction (N x ) and the number of elements in a horizontal direction (N y ), and whether the phase states of all elements in each column can be controlled together; and receiving a reflection coefficients matrix derived based on the RIS capability.
1 . A method performed by a Reconfigurable Intelligent Surface (RIS) device, the method comprising:
transmitting RIS capability including at least a number of elements in a vertical direction (N x ) and a number of elements in a horizontal direction (N y ), and whether phase states of all elements in each column can be controlled together; and
receiving a reflection coefficients matrix derived based on the RIS capability, wherein, when the phase states of all elements in each column can be controlled together, the reflection coefficients matrix has a size of N y ×1, and when the phase states of all elements in each column can be controlled independently, the reflection coefficients matrix has a size of N y ×N x .
2 . The method of claim 1 , wherein;
the RIS capability further includes a number of phase states of each element (M); and
each reflection coefficient in the reflection coefficients matrix has N bit(s), where N=log 2 (M).
3 . The method of claim 1 , wherein the RIS capability further includes a number of RIS panels, and each RIS panel has a same structure.
4 . The method of claim 1 , wherein the RIS capability further includes whether dual meta-atom types are adopted.
5 . The method of claim 4 , wherein, when the dual meta-atom types are adopted, the RIS capability further includes an initial phase of each meta-atom type before phase change, and a meta-atom pattern.
6 . A Reconfigurable Intelligent Surface (RIS) device, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the RIS to:
transmit RIS capability including at least a number of elements in a vertical direction (N x ) and a number of elements in a horizontal direction (N y ), and whether phase states of all elements in each column can be controlled together; and
receive a reflection coefficients matrix derived based on the RIS capability, wherein, when the phase states of all elements in each column can be controlled together, the reflection coefficients matrix has a size of N y ×1, and when the phase states of all elements in each column can be controlled independently, the reflection coefficients matrix has a size of N y ×N x .
7 . The RIS device of claim 6 , wherein:
the RIS capability further includes a number of phase states of each element (M); and
each reflection coefficient in the reflection coefficients matrix has N bit(s), where N=log 2 (M).
8 . The RIS device of claim 6 , wherein the RIS capability further includes a number of RIS panels, and each RIS panel has a same structure.
9 . The RIS device of claim 6 , wherein the RIS capability further includes whether dual meta-atom types are adopted.
10 . The RIS device of claim 9 , wherein, when the dual meta-atom types are adopted, the RIS capability further includes an initial phase of each meta-atom type before phase change, and a meta-atom pattern.
11 . A method performed by a base station, the method comprising:
receiving Reconfigurable Intelligent Surface (RIS) capability including at least a number of elements in a vertical direction (N x ) and a number of elements in a horizontal direction (N y ), and whether phase states of all elements in each column can be controlled together;
deriving a reflection coefficients matrix based on the RIS capability, wherein, when the phase states of all elements in each column can be controlled together, the reflection coefficients matrix has a size of N y ×1, and when the phase states of all elements in each column can be controlled independently, the reflection coefficients matrix has a size of N y ×N x ; and
transmitting the reflection coefficients matrix.
12 . A base station for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the base station to:
receive Reconfigurable Intelligent Surface (RIS) capability including at least a number of elements in a vertical direction (N x ) and a number of elements in a horizontal direction (N y ), and whether phase states of all elements in each column can be controlled together;
derive a reflection coefficients matrix based on the RIS capability, wherein, when the phase states of all elements in each column are controlled together, the reflection coefficients matrix has a size of N y ×1, and when the phase states of all elements in each column are controlled independently, the reflection coefficients matrix has a size of N y ×N x ; and
transmit the reflection coefficients matrix.
13 . The base station of claim 12 , wherein:
the RIS capability further includes a number of phase states of each element (M); and
each reflection coefficient in the reflection coefficients matrix has N bit(s), where N=log 2 (M).
14 . The base station of claim 12 , wherein the RIS capability further includes 1 number of RIS panels, and each RIS panel has a same structure.
15 . The base station of claim 12 , wherein the RIS capability further includes whether dual meta-atom types are adopted.
16 . The base station of claim 15 , wherein, when the dual meta-atom types are adopted, the RIS capability further includes an initial phase of each meta-atom type before phase change, and a meta-atom pattern.