Node and methods performed by the node in a wireless communication network

1 . A method performed by a first node, the method comprising:

obtaining a time domain baseband signal;

performing a first self-interference cancellation on the obtained time domain baseband signal;

performing power sensing on the first self-interference cancelled time domain baseband signal;

detecting target points requiring a second self-interference cancellation based on a result of the power sensing:

determining whether to perform the second self-interference cancellation based on the result of the power sensing; and

in case that the second self-interference cancellation is determined to be performed, performing the second self-interference cancellation on a time domain baseband signal related to the target points.

2 . The method according to claim 1 , wherein the result of the power sensing includes corresponding power-related information at positions with different distances.

3 . The method according to claim 1 , wherein performing the power sensing on the first self-interference cancelled time domain baseband signal comprises:

performing frequency domain channel estimation on the first self-interference cancelled time domain baseband signal; and

performing power sensing based on a frequency domain channel estimation result.

4 . The method according to claim 3 , wherein performing the power sensing based on the frequency domain channel estimation result comprises:

performing inverse Fourier transform on the frequency domain channel estimation result; and

calculating the power point by point to obtain the power sensing result.

5 . The method according to claim 1 , wherein detecting the target points requiring the second self-interference cancellation based on the result of the power sensing comprises:

determining a power threshold value corresponding to the second self-interference cancellation, and

wherein detecting the target points requiring the second self-interference cancellation based on the result of the power sensing comprises detecting the target points requiring the second self-interference cancellation, based on the result of the power sensing and the power threshold value.

6 . The method according to claim 5 , wherein determining the power threshold value corresponding to the second self-interference cancellation comprises:

determining a power difference between the corresponding linear components and nonlinear components of the time domain baseband signal; and

determining the power threshold value corresponding to the second self-interference cancellation based on the power difference.

7 . The method according to claim 5 , wherein detecting the target points requiring the second self-interference cancellation further comprises:

obtaining a noise floor power of the time domain baseband signal after the first self-interference cancellation;

based on the result of the power sensing, detecting target points whose power is higher than the noise floor power by at least the power threshold value; and

determining the detected target points as the target points requiring the second self-interference cancellation.

8 . The method according to claim 1 , wherein determining whether to perform the second self-interference cancellation based on the result of the power sensing comprises:

if it is determined that there is no target point requiring the second self-interference cancellation based on the result of the power sensing, determining not to perform the second self-interference cancellation; and

if it is determined that there are target points requiring the second self-interference cancellation based on the result of the power sensing, determining to perform the second self-interference cancellation.

9 . The method according to claim 1 , wherein performing the second self-interference cancellation on the time domain baseband signal related to the target points comprises:

performing the second self-interference cancellation on the obtained time domain baseband signal; or

performing the second self-interference cancellation on the time domain baseband signal after the first self-interference cancellation.

10 . The method according to claim 9 , wherein performing the second self-interference cancellation on the time domain baseband signal related to the target points further comprises:

performing the second self-interference cancellation with respect to a path set corresponding to the target points requiring the second self-interference cancellation and a path set corresponding to the first self-interference cancellation, and

wherein performing the second self-interference cancellation on the first self-interference cancelled time domain baseband signal further comprises:

performing the second self-interference cancellation with respect to the path set corresponding to the target points requiring the second self-interference cancellation.

11 . The method according to claim 1 , further comprising:

receiving self-interference cancellation parameter configuration information transmitted by a second node,

wherein performing the first self-interference cancellation on the obtained time domain baseband signal comprises:

performing the first self-interference cancellation on the obtained time domain baseband signal based on the self-interference cancellation parameter configuration information, and

wherein performing the second self-interference cancellation on the obtained time domain baseband signal comprises:

performing the second self-interference cancellation on the obtained time domain baseband signal based on the self-interference cancellation parameter configuration information.

12 . The method according to claim 11 , wherein receiving the self-interference cancellation parameter configuration information transmitted by the second node comprises:

receiving the self-interference cancellation parameter configuration information transmitted by the second node through downlink control information (DCI), medium access control (MAC) signaling, or higher layer signaling.

13 . The method according to claim 11 , wherein the self-interference cancellation parameters include, at least one of, a number of paths for the first self-interference cancellation, a power difference between the corresponding linear components and nonlinear components of the time domain baseband signal, a self-interference cancellation order, or a power threshold adjustment parameter.

14 . The method according to claim 11 , wherein the second node is a parent node of the first node.

15 . A first node in a wireless communication system, the first node comprising:

at least one transceiver;

at least one processor communicatively coupled to the at least one transceiver; and

at least one memory, communicatively coupled to the at least one processor, storing instructions executable by the at least one processor to cause the first node to:

obtain a time domain baseband signal,

perform a first self-interference cancellation on the obtained time domain baseband signal,

perform power sensing on the first self-interference cancelled time domain baseband signal,

detect target points requiring a second self-interference cancellation based on a result of the power sensing,

determine whether to perform the second self-interference cancellation based on the result of the power sensing, and

in case that the second self-interference cancellation is determined to be performed, perform the second self-interference cancellation on a time domain baseband signal related to the target points.