User Equipment SRS Transmission for Remote Cross-Link Interference Cancellation
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Solution Overview
Problem
Full-duplex communication systems face challenges in canceling remote cross-link interference due to environmental factors, which affects the quality of wireless communication between base stations and user equipment.
Innovation Solution
A method and apparatus for transmitting and receiving a Sounding Reference Signal (SRS) by user equipment (UE) to cancel remote cross-link interference, involving the reception of Channel State Information-Reference Signal (CSI-RS) from a base station, transmission of a CSI report, and configuration-based SRS transmission to manage interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex communication is implemented to double system capacity, then transmission and reception can occur simultaneously, but remote cross-link interference occurs between base stations due to environmental factors such as atmospheric duct effects
Solution Approach 1:
The patent applies preliminary action by having the user equipment transmit the Sounding Reference Signal (SRS) in advance before the actual data transmission occurs. This allows the base station to measure and estimate the remote cross-link interference channel characteristics beforehand, so that when full-duplex communication occurs, the interference can be cancelled using the pre-obtained channel state information. The SRS transmission is performed in a dedicated uplink slot before the flexible duplex slot where both downlink and uplink occur simultaneously.
Solution Approach 2:
The patent uses the user equipment as an intermediary to measure and report the remote cross-link interference. Instead of having base stations directly measure interference from each other, the UE acts as a relay by receiving downlink signals from one base station, transmitting uplink signals to another base station, and enabling the receiving base station to measure the interference through the UE's transmitted signal. The UE effectively mediates the interference measurement process between distant base stations.
2Reliability
If SRS transmission is configured to cancel remote CLI, then interference cancellation capability is improved, but device complexity increases due to additional signaling and measurement procedures
Solution Approach 1:
The patent applies universality by making the user equipment perform multiple functions with the same hardware resources. The UE uses its existing uplink transmission capabilities to serve dual purposes: normal uplink data transmission and SRS transmission for remote CLI measurement. The same uplink resources and transmission mechanisms are utilized for both communication and interference measurement, avoiding the need for dedicated separate measurement hardware or procedures.
Solution Approach 2:
The patent applies self-service by having the base station perform the interference measurement and cancellation processing itself using the SRS signals received from the UE. The receiving base station autonomously measures the remote CLI channel characteristics from the SRS signals, generates the appropriate cancellation parameters, and applies interference cancellation to its own received signals without requiring complex coordination or additional processing assistance from other network elements.
Data Source
AI summary
A method by which a user equipment (UE) transmits a sounding reference signal (SRS) in a wireless communication system, according to the present disclosure, can comprise: receiving a channel state information (CSI)-reference signal (RS) from a base station; transmitting, on the basis of the received CSI-RS, a CSI report including a channel quality indicator (CQI) to the base station; receiving first configuration information from the base station, wherein the first configuration information is generated on the basis of the CQI; receiving second configuration information including an SRS configuration from the base station; and transmitting an SRS on the basis of the first configuration information and the second configuration information.