Sidelink Interference Feedback Between UEs for Cross-Link Collisions
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in managing UE-to-UE cross-link interference, particularly in scenarios where uplink transmissions from one UE collide with downlink transmissions to another UE, leading to degraded signal quality and network performance, as the victim UE's interference measurements are often reported to the base station and then relayed to the aggressor UE, introducing delays and inefficiencies.
Innovation Solution
A victim UE directly transmits cross-link interference information to the aggressor UE via sidelink channels, allowing the aggressor UE to adjust its uplink transmissions to mitigate interference, thereby improving network communication efficiency and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the victim UE reports interference measurements to the base station which then relays them to the aggressor UE, then the interference information can be delivered to the aggressor UE, but transmission delays are introduced and network efficiency is reduced
Solution Approach 1:
The patent extracts the interference information reporting function from the base station relay path and enables direct reporting between UEs via sidelink channels. The victim UE directly transmits interference measurements to the aggressor UE using physical sidelink feedback channels (PSFCH) or physical sidelink shared channels (PSSCH), eliminating the base station as an intermediary and reducing transmission delay.
Solution Approach 2:
The patent introduces sidelink channels as a new communication intermediary between UEs. By establishing direct UE-to-UE communication paths for interference information exchange, the system creates a more efficient mediator than the base station relay, reducing the number of hops and transmission delays while ensuring reliable delivery of interference information.
2Productivity
If direct sidelink transmission of interference information is implemented, then transmission delays are reduced and network efficiency is improved, but additional sidelink channel resources and UE capabilities are required
Solution Approach 1:
The patent leverages existing sidelink communication infrastructure designed for other purposes (such as vehicle-to-vehicle communication) and repurposes it for interference information transmission. The same sidelink channels (PSFCH, PSSCH) and protocols used for data communication are utilized for control information exchange, eliminating the need for separate dedicated channels and reducing overall system complexity.
Solution Approach 2:
The patent enables UEs to autonomously measure, report, and respond to interference without requiring base station coordination for each interference event. The victim UE independently performs measurements, encodes interference information, and transmits it directly to the aggressor UE, which then autonomously adjusts its transmission parameters. This self-service mechanism reduces signaling overhead and base station processing requirements.
3Reliability
If the aggressor UE adjusts uplink transmissions based on direct feedback from the victim UE, then interference mitigation is more timely and effective, but the aggressor UE must continuously monitor and respond to sidelink messages
Solution Approach 1:
The patent implements selective interference mitigation where the aggressor UE adjusts transmission parameters only in specific subframes or resource blocks where interference is detected, rather than continuously adjusting all transmissions. The feedback mechanism triggers targeted power adjustments or resource allocations only when and where needed, reducing the operational burden on the aggressor UE while maintaining effective interference mitigation.
Solution Approach 2:
The patent establishes a closed-loop feedback system where the victim UE continuously monitors interference levels and sends updated measurements to the aggressor UE via sidelink channels. The aggressor UE uses this feedback to dynamically adjust its uplink transmission power or resource allocation, creating a self-regulating mechanism that automatically adapts to changing interference conditions without requiring complex manual configuration.
Data Source
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AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a victim user equipment (UE) may measure a cross-link interference strength from an aggressor UE based at least in part on an uplink transmission from the aggressor UE colliding with a downlink transmission to the victim UE. The victim UE may transmit cross-link interference information to the aggressor UE on a sidelink channel. For example, the cross-link interference information transmitted to the aggressor UE may indicate at least the cross-link interference strength measured by the victim UE. Numerous other aspects are provided.