Full Duplex Base Station Reference Signal Collision Cancellation
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Solution Overview
Problem
Full-duplex wireless communication systems face significant interference from reference signal collisions, which degrade channel quality estimation and demodulation performance due to the simultaneous transmission of downlink and uplink signals in the same physical resources, leading to reduced spectral efficiency.
Innovation Solution
The implementation of Code Division Multiplexing (CDM) and signal suppression techniques between downlink and uplink signals on collided resource elements, where CDM is applied to separate downlink and uplink signals using orthogonal codes, and signal suppression is used to reduce interference from downlink signals on resource elements with uplink reference signals, thereby mitigating reference signal collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex mode is used to transmit downlink and uplink signals in the same physical resources, then spectral efficiency is improved, but reference signal collision interference increases
Solution Approach 1:
The patent segments the collided reference signals by applying different orthogonal codes (e.g., Walsh-Hadamard codes) to downlink and uplink reference signals on the same resource elements. This code-domain segmentation allows the receiver to separate and independently estimate channel responses for each direction, resolving the interference caused by full-duplex operation while maintaining spectral efficiency.
2Measurement precision
If downlink signals are suppressed on resource elements with uplink reference signals, then uplink reference signal quality is improved, but downlink signal transmission is degraded
Solution Approach 1:
Instead of completely suppressing downlink signals on all resource elements with uplink reference signals, the patent applies partial suppression only where necessary while maintaining downlink transmission elsewhere. Combined with CDM, this allows selective interference management that preserves uplink reference signal quality without excessive loss of downlink capacity.
Data Source
AI summary
Provided are a base station, user equipment and wireless communication method related to RS collision cancellation in full duplex communication. A base station comprises: circuitry operative to perform at least one of a first processing and a second processing on downlink signals to be transmitted on a physical resource unit in a full duplex mode corresponding to one Transmission Time Interval (TTI); a transmitter operative to transmit the processed downlink signals on the physical resource unit to a first user NO equipment in a TTI; and a receiver operative to receive uplink signals on the physical resource unit from a second user equipment, wherein the first processing is use to be performed such that Code Division Multiplexing (CDM) is applied between the downlink signal and the uplink signal assigned on each of at least part of collided resource elements in the physical resource unit, each of the collided resource elements being assigned with both a downlink signal and an uplink signal at least one of which is a reference signal, and the second processing comprises suppressing at least part of the downlink signals assigned on the resource elements assigned with uplink reference signals thereon in the collided resource elements.