Sidelink Relay Retransmission Budgeting Under ACK Constraints
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Solution Overview
Problem
The challenge in wireless communication systems is determining the optimal maximum number of retransmissions for relay UEs in sidelink communication to enhance reliability and resource utilization.
Innovation Solution
The method involves a relay UE receiving a signal from a source UE, transmitting it to a destination UE, and performing retransmissions while accounting for acknowledgments, with the number of retransmissions determined by excluding acknowledgments sent to the source UE from a maximum number, which can be fully or partially shared with the source UE based on congestion levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relay UE transmits both data signals and acknowledgment signals using the maximum number of retransmissions, then communication reliability is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent extracts the acknowledgment transmission function from the data retransmission budget. By determining that the relay UE does not need to transmit separate acknowledgments to the source UE in relay mode, the available retransmission resources are exclusively allocated to data transmissions to the destination UE, thereby improving resource utilization while maintaining communication reliability
Solution Approach 2:
The patent applies multi-functionality by having the relay UE use its transmission resources universally for data retransmissions to the destination UE rather than dividing them between acknowledgments to the source UE and data to the destination UE. This consolidates the retransmission budget into a single purpose, improving overall resource efficiency
2Loss of energy
If the relay UE shares the maximum number of retransmissions with the source UE based on congestion levels, then resource utilization efficiency is improved, but communication reliability may deteriorate
Solution Approach 1:
The patent implements dynamic resource allocation where the maximum number of retransmissions is adjusted based on congestion levels. When congestion is detected, the relay UE and source UE share the retransmission budget dynamically, allowing the system to adapt resource distribution to current network conditions while maintaining overall reliability
Solution Approach 2:
The patent changes the retransmission parameter from a fixed value to a dynamic value that varies with congestion levels. By monitoring congestion and adjusting the maximum number of retransmissions accordingly, the system optimizes resource utilization during high congestion while preserving reliability during normal conditions
Data Source
AI summary
An embodiment relates to a method for an operation of a sidelink relay UE in a wireless communication system, the method comprising: a step in which the relay UE receives a first signal from a source UE; a step in which the relay UE transmits a second signal based on the first signal to a destination UE; and a step in which the relay UE performs retransmission of the second signal to the destination UE, wherein, on the basis that the relay UE is configured to transmit a reception acknowledgement response to the first signal, the number of times that the relay UE can retransmit the second signal is obtained by excluding the number of times that the relay UE has transmitted a reception acknowledgement response to the source UE from a first maximum retransmission number.