Random Access Configuration for Cross-Link Interference Management
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Solution Overview
Problem
Wireless communication systems face challenges in managing cross-link interference during random access procedures, particularly in full duplex mode, which can lead to self-interference and disrupt communications, especially in scenarios requiring ultra-reliable low-latency communications.
Innovation Solution
Wireless devices select random access occasions and beams based on both downlink channel quality measurements and cross-link interference (CLI) measurements, switching between full duplex and half duplex modes and adjusting transmit power to minimize CLI, using synchronization signal blocks (SSBs) and interference measurement occasions to determine the optimal configuration for transmitting random access messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless devices transmit random access messages using full duplex mode, then communication efficiency is improved, but cross-link interference increases
Solution Approach 1:
The system dynamically switches between full duplex and half duplex modes based on real-time CLI measurements. The wireless device monitors CLI on interference measurement occasions and adaptively selects the appropriate random access occasion type (full duplex or half duplex) to transmit the random access message, optimizing communication efficiency while minimizing cross-link interference
Solution Approach 2:
The system changes the operational parameters of random access transmission by selecting different duplex modes (full duplex or half duplex) based on CLI conditions. The base station configures multiple random access occasions with different duplex characteristics, and the wireless device adjusts its transmission parameters according to measured CLI levels
2Measurement precision
If wireless devices perform both SSB measurements and CLI measurements, then random access configuration accuracy is improved, but device complexity increases
Solution Approach 1:
The measurement process is segmented into distinct phases: SSB measurements are performed on synchronization signal block occasions to assess downlink channel quality, while CLI measurements are performed separately on interference measurement occasions to assess cross-link interference levels. This segmentation allows the device to independently evaluate different channel conditions and make informed decisions about random access transmission
3Object-generated harmful factors
If transmit power is reduced to minimize CLI, then cross-link interference is reduced, but communication reliability deteriorates
Solution Approach 1:
The system uses half duplex random access occasions as an intermediary solution when CLI levels are high. Instead of simply reducing power (which would compromise reliability), the device switches to half duplex mode where transmission and reception occur at different times, effectively eliminating CLI while maintaining adequate transmit power for reliable communication
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Generally, a wireless device may select random access channel occasions (ROs) based jointly on synchronization signal block (SSB) measurements and cross-link interference (CLI) measurements. The base station may configure the wireless device with a set of SSB occasions during which to measure SSBs and a set of interference measurement occasions on which to measure CLI caused by other wireless devices. The wireless device may perform measurements on the received SSBs to determine channel quality for communications with the base station, and CLI measurements during the interference measurement occasions to determine whether CLI exceeds a threshold. The wireless device may then select a beam and an associated RO (e.g., a full duplex RO or a half duplex RO) on which to transmit the random access message using the selected beam.