Sidelink Reception Feedback for Overlapping Signal Interference
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Solution Overview
Problem
Wireless communications systems experience inefficiencies due to interference between transmissions, leading to poor signal quality and decoding failures, particularly in sidelink communications where UEs send overlapping transmissions with non-orthogonal reference signals.
Innovation Solution
A first UE, equipped with multiple transmission reception points, identifies overlapping time-frequency resources and transmits interference mitigation signals, such as negative acknowledgment indications or orthogonalization signals, to other UEs to improve decoding success.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs transmit using non-orthogonal reference signals on overlapping time-frequency resources, then communication productivity is improved, but signal quality and decoding reliability deteriorate due to interference
Solution Approach 1:
The patent implements a feedback mechanism where the first UE detects interference from overlapping transmissions and sends an interference mitigation signal back to the transmitting UEs. This feedback loop enables the system to maintain high productivity by allowing overlapping transmissions while ensuring reliability through active interference management and signal orthogonalization requests.
Solution Approach 2:
The first UE acts as an intermediary by receiving transmissions from multiple UEs, detecting interference conditions, and coordinating interference mitigation. This intermediary role allows the system to maintain efficient overlapping transmissions while ensuring reliable decoding by mediating between conflicting transmissions through orthogonalization requests.
2Productivity
If UEs use overlapping time-frequency resources for transmissions, then communication efficiency is improved, but interference increases leading to poor signal quality
Solution Approach 1:
The system applies preliminary anti-action by having the first UE detect potential interference from overlapping transmissions and send mitigation signals before the interfering UEs complete their transmissions. This preemptive interference management allows overlapping transmissions to proceed efficiently while neutralizing harmful interference effects through coordinated orthogonalization.
Solution Approach 2:
The first UE serves as an intermediary that monitors overlapping transmissions, identifies interference conditions, and coordinates mitigation actions. This intermediary function enables efficient resource utilization through overlapping transmissions while actively managing and reducing harmful interference through orthogonalization requests to transmitting UEs.
3Reliability
If the system implements interference mitigation signaling, then decoding reliability is improved, but device complexity increases
Solution Approach 1:
The interference mitigation system operates in a self-service manner where the first UE autonomously detects interference conditions, determines mitigation actions, and sends coordination signals to transmitting UEs without requiring network intervention. This self-service approach improves decoding reliability through active interference management while minimizing device complexity by avoiding complex centralized control mechanisms.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may receive, at a first transmission reception point, a first transmission from a second UE associated with communications between the second UE and a third UE. The first UE may receive, at a second transmission reception point, a second transmission. The first UE may identify transmissions having overlapping time-frequency resources based on receiving the first transmission and the second transmission. In some examples, the identified transmissions may include the first transmission and the second transmission. Additionally or alternatively, the identified transmissions may include a third transmission and a fourth transmission. The first UE may transmit an interference mitigation signal to the second UE. The interference mitigation signal may include an indication to orthogonalize one or more reference signals, a negative acknowledgment indication, or both.