NR-Duplex Joint Beam Management for Cross-Link Interference
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Solution Overview
Problem
Conventional TDD operation in NR duplexing faces challenges due to cross-link interferences (CLI) that hinder the feasibility of cross division duplex (XDD), affecting uplink coverage, capacity, and latency.
Innovation Solution
A wireless transmit-receive unit (WTRU) measures and reports CLI per WTRU beam index and SRS resource index, determining a pair of indices corresponding to the strongest or weakest CLI, to facilitate coordinated beam management and interference mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cross division duplex (XDD) is implemented to improve uplink coverage and capacity, then uplink coverage and capacity are improved, but cross-link interferences (CLI) increase
Solution Approach 1:
The patent implements a feedback mechanism where the WTRU measures CLI on SRS resources, determines the strongest CLI source, and reports back to the network node. This feedback enables the network to identify interfering beams and adjust beam management strategies to mitigate CLI while maintaining XDD operation benefits.
Solution Approach 2:
The patent introduces SRS resources as an intermediary measurement mechanism. By measuring CLI on dedicated SRS resources rather than on data channels, the system can identify and manage interference sources without directly impacting the harmful interference on user data transmissions.
2Object-affected harmful factors
If beam management is enhanced to mitigate CLI, then CLI is reduced, but measurement and reporting complexity increases
Solution Approach 1:
The patent segments the beam management process into distinct measurement and reporting phases. The WTRU measures CLI on multiple SRS resources corresponding to different beams, identifies the strongest interference source, and reports only the relevant beam index pair. This segmentation reduces the reporting overhead compared to reporting all measurements.
Solution Approach 2:
The patent applies local quality by focusing measurement and reporting efforts on the specific beam pair causing the strongest CLI. Rather than uniformly managing all beams, the system concentrates resources on identifying and mitigating the dominant interference source, optimizing the trade-off between CLI reduction and complexity.
Data Source
AI summary
Procedures, methods, architectures, apparatuses, systems, devices, and computer program products for joint beam management. A first wireless transmit-receive unit, WTRU, may be subject to radio signal interference caused by a second WTRU. The first WTRU may receive, from a network node, information relative to measurement configuration and measurement configuration and reporting configuration for at least one channel quality reference signal received by the first WTRU from the second WTRU. The first WTRU may determine channel quality per WTRU panel/beam index and per the at least one channel quality reference signal received by the first WTRU from the second WTRU according to the measurement configuration received. The first WTRU may report, to the network node, channel state information based on the determined channel quality, according to the reporting configuration received. The network node may then instruct, for example, the second WTRU to avoid transmitting in the direction of the first WTRU.