Victim UE Sidelink Feedback for Cross-Link Interference Control
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in managing cross-link interference between user equipment (UEs) due to uplink transmissions colliding with downlink transmissions, leading to degraded performance and network inefficiencies.
Innovation Solution
Victim UE measures cross-link interference strength and transmits this information directly to the aggressor UE via a sidelink channel, allowing the aggressor UE to adjust its uplink transmissions to mitigate performance loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink transmissions from aggressor UE are allowed to proceed without interference management, then network capacity and communication efficiency are maintained, but cross-link interference degrades victim UE performance and reduces overall network reliability
Solution Approach 1:
The victim UE measures cross-link interference strength and feeds back this information to the aggressor UE via sidelink channels. This feedback mechanism enables the aggressor UE to adjust its uplink transmissions to mitigate interference, thereby improving victim UE downlink reception reliability while maintaining overall network efficiency through targeted adjustments rather than blanket restrictions.
Solution Approach 2:
The patent introduces sidelink channels as an intermediary communication path between victim UE and aggressor UE. This intermediary enables direct interference information exchange without requiring base station intervention for each adjustment, reducing signaling overhead and maintaining network productivity while improving reliability through localized interference management.
2Reliability
If cross-link interference information is transmitted via traditional uplink channels through the base station, then interference management is achieved, but signaling overhead increases and response time is delayed
Solution Approach 1:
The patent segments the interference management function into direct UE-to-UE communication via sidelink channels, separating this specific function from the traditional base station-controlled uplink channels. This segmentation enables faster, more direct interference information transmission while reducing unnecessary signaling overhead to the base station, thereby reducing time loss without compromising mitigation effectiveness.
Solution Approach 2:
Sidelink channels serve as a direct intermediary communication path between victim and aggressor UEs, eliminating the need for base station as an intermediary for interference information exchange. This direct path reduces transmission delay and signaling overhead while maintaining effective interference mitigation through real-time information sharing.
3Reliability
If aggressive interference mitigation measures are implemented to protect victim UE, then victim UE performance is improved, but network capacity and overall communication efficiency are reduced
Solution Approach 1:
The patent applies interference mitigation locally and selectively only where cross-link interference is detected, rather than implementing blanket restrictions across the entire network. The aggressor UE adjusts transmissions only in affected frequency resources and time slots, preserving network capacity in unaffected areas while improving victim UE downlink performance through targeted local adjustments.
Solution Approach 2:
The aggressor UE dynamically changes transmission parameters (power level, resource allocation) based on received interference strength information from the victim UE. This parameter adjustment approach enables effective interference mitigation for victim UE while maintaining optimal network capacity through adaptive rather than static transmission configurations.
Data Source
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.