Beam Management for Full-Duplex Cross-Link Interference
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Solution Overview
Problem
Full-duplex wireless communication systems face challenges with cross-link interference (CLI) between user equipment (UEs) communicating with the same network unit, which can degrade communication quality and increase latency.
Innovation Solution
The method involves a network entity transmitting CLI transmission and reception resources to UEs, which then measure and report interference based on reference signals. The network entity uses these reports to schedule communications using preferred beams, thereby minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex communication is implemented to increase flexibility and improve latency, then communication efficiency is improved, but cross-link interference between UEs occurs that degrades communication quality
Solution Approach 1:
The network entity performs preliminary actions by configuring CLI measurement resources and reference signals before full-duplex communication occurs. UEs measure CLI on configured resources and report measurements to the network entity, which then schedules communications to avoid or mitigate identified interference, preventing degradation before it occurs
Solution Approach 2:
A feedback loop is established where UEs continuously measure CLI on configured resources and report measurements back to the network entity. The network entity uses this feedback to dynamically adjust resource allocation and scheduling decisions, adapting to changing interference conditions to maintain communication quality
2Reliability
If beam measurements are performed to identify preferred and restricted beams for mitigating CLI, then communication reliability is improved, but additional signaling and measurement overhead is introduced
Solution Approach 1:
The network entity configures UEs to use existing uplink and downlink communication resources for dual purposes: normal data transmission and CLI measurement. By making these resources multi-functional, the system obtains CLI measurement capabilities without requiring entirely separate dedicated measurement resources, reducing overall signaling overhead
3Object-affected harmful factors
If the network entity schedules communications based on CLI measurement reports to minimize interference, then communication quality is improved, but processing and scheduling complexity increases
Solution Approach 1:
The network entity applies local quality by making scheduling decisions specific to each UE pair and resource configuration based on their individual CLI measurement reports. Rather than applying uniform scheduling rules system-wide, the network entity tailors resource allocation and beam selection to the local interference conditions of each communication pair, optimizing quality while managing complexity through targeted rather than universal processing
Data Source
AI summary
Systems and methods for beam management in a wireless communication system are provided. In a network with a full duplex network entity communicating with two UEs, the network entity may configure cross-link interference (CLI) resources such that the interference between the devices may be characterized. One UE may transmit a reference signal which is read by the other device. Based on the measurement, a report may be sent to the network entity. The network entity may use the information in the report to then base scheduling decisions, and/or indicate to the UEs which beams are restricted from use in order to avoid excessive interference.