Full-Duplex RACH Selection to Mitigate Cross-Link Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in managing cross-link interference (CLI) during full-duplex (FD) random access (RA) procedures, which can degrade communication quality and reliability.
Innovation Solution
Implementing techniques for detecting and mitigating CLI by selecting RACH occasions based on monitoring reference signals from neighbor UEs, configuring reference signal resources, and adjusting transmission strategies to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex resources are used for RACH transmission to improve spectral efficiency and reduce latency, then productivity is improved, but cross-link interference degrades communication reliability
Solution Approach 1:
The patent applies preliminary action by having UEs monitor reference signals from neighbor UEs before selecting RACH occasions for full-duplex transmission. This advance detection of potential interference sources allows the system to proactively avoid problematic time-frequency resources, thereby maintaining both high spectral efficiency and communication reliability when using full-duplex resources
2Reliability
If reference signal monitoring is implemented to detect cross-link interference, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service by having UEs autonomously monitor reference signals from neighbor UEs and independently make RACH occasion selection decisions based on detected interference levels. This distributed self-service approach improves communication reliability through interference awareness while avoiding the need for complex centralized coordination mechanisms
Solution Approach 2:
The patent uses feedback by having UEs continuously monitor reference signals and adjust their RACH occasion selection based on detected cross-link interference from neighbor UEs. This feedback mechanism enables reliable communication by allowing UEs to adapt their transmission decisions to current interference conditions without requiring complex system-wide coordination
3Object-generated harmful factors
If RACH occasions are selected based on neighbor UE reference signal detection, then cross-link interference is reduced, but loss of time increases due to additional monitoring requirements
Solution Approach 1:
The patent applies preliminary action by having UEs monitor reference signals and identify suitable RACH occasions before actual random access transmission. This advance preparation reduces cross-link interference by selecting interference-free resources, while the monitoring is performed during idle periods or using pre-configured reference signal resources that do not delay the critical RACH transmission timeline
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may receive information indicating a reference signal resource associated with detecting cross-link interference associated with transmitting a random access channel (RACH) message on full duplex resources. The first UE may transmit a RACH message on a selected RACH occasion, wherein the selected RACH occasion is selected based at least in part on whether a reference signal transmitted by a neighbor UE of the first UE has been detected in association with the selected RACH occasion. Numerous other aspects are described.