Sidelink Feedback Prioritization Under UE Duty Cycle Limits
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Solution Overview
Problem
The increased number of sidelink feedback transmissions by a UE can consume a majority of the allowed duty cycle, leading to reduced resources for data transmissions, resulting in decreased data throughput and increased data transfer latencies in sidelink communications.
Innovation Solution
A receive UE prioritizes sidelink transmissions using a sidelink inter-channel prioritization rule, giving priority to physical sidelink shared channel (PSSCH) transmissions over physical sidelink feedback channel (PSFCH) transmissions, thereby selectively dropping PSFCH communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE transmits more sidelink feedback communications, then feedback reliability is improved, but data throughput deteriorates due to reduced resources for data transmissions
Solution Approach 1:
The patent changes the parameter of transmission priority by introducing inter-channel prioritization rules that assign higher priority to PSSCH (data) transmissions over PSFCH (feedback) transmissions. This parameter change in transmission priority resolves the contradiction by allowing the system to maintain feedback reliability through selective PSFCH transmission while improving data throughput by ensuring PSSCH transmissions are not blocked.
2Reliability
If a UE transmits more sidelink feedback communications, then feedback reliability is improved, but data transfer latency deteriorates due to reduced resources for data transmissions
Solution Approach 1:
The patent applies parameter changes by modifying the transmission priority parameter between different channels. By setting PSSCH priority higher than PSFCH priority, the system ensures that data transmissions experience reduced latency while feedback transmissions are still reliably delivered through the prioritized PSFCH opportunities.
3Productivity
If a UE prioritizes PSSCH transmissions over PSFCH transmissions, then data throughput is improved, but feedback reliability may deteriorate
Solution Approach 1:
The patent uses feedback mechanisms where the receiving UE reports channel conditions and transmission status back to the transmitting UE. This feedback loop allows the system to dynamically adjust transmission priorities and ensure that both data throughput and feedback reliability are maintained through adaptive resource allocation based on actual channel conditions.
Solution Approach 2:
The patent changes the transmission priority parameter dynamically based on channel conditions. By adjusting priorities according to feedback information about channel quality and traffic patterns, the system can prioritize data transmissions when conditions favor throughput while ensuring feedback transmissions occur when reliability is critical, thus resolving the contradiction between the two objectives.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a receive user equipment (UE) may receive a transmission from a transmit UE. The UE may transmit a sidelink communication selectively and based at least in part on a sidelink inter-channel prioritization rule. Numerous other aspects are described.