Sidelink Relay Feedback for Wireless Transmission Reliability
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Solution Overview
Problem
Current wireless communication systems lack a method for the transmitting entity, such as a base station or user equipment, to be aware of the status of transmissions relayed through relay nodes, specifically regarding successful or unsuccessful receipt of data at the receiving entity, leading to inefficiencies in retransmissions and resource allocation.
Innovation Solution
Implementing a feedback mechanism where relay devices transmit HARQ-ACK or HARQ-NACK feedback to the transmitting entity, indicating successful or unsuccessful receipt of data at the receiving entity, and allowing for retransmissions with modified parameters or route changes based on this feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay nodes forward transmissions without feedback mechanism, then device complexity is reduced, but transmission reliability deteriorates because transmitting entity cannot determine successful delivery
Solution Approach 1:
The patent implements a feedback mechanism where relay nodes send HARQ-ACK feedback to transmitting entities to indicate successful or unsuccessful data reception. This feedback loop enables the transmitting entity to determine whether retransmissions are necessary, thereby improving transmission reliability while managing system complexity through standardized feedback procedures
Solution Approach 2:
The relay node acts as an intermediary between the transmitting entity and the receiving entity. It receives data from the transmitting entity, attempts to forward it to the receiving entity, and provides feedback to the transmitting entity about the forwarding status. This intermediary role enables reliable communication through multiple hops while maintaining clear responsibility boundaries
2Reliability
If retransmissions are performed without reception status information, then productivity is maintained through continuous transmission, but transmission reliability deteriorates due to unnecessary or missing retransmissions
Solution Approach 1:
The HARQ-ACK feedback mechanism provides the transmitting entity with accurate reception status information. When the relay node successfully receives data, it sends HARQ-ACK=1, allowing the transmitting entity to stop retransmissions and allocate resources elsewhere. When reception fails, HARQ-ACK=0 triggers necessary retransmissions, ensuring reliable delivery without wasting resources on unnecessary transmissions
Solution Approach 2:
The system enables self-service through automated feedback-driven retransmission control. The transmitting entity automatically adjusts its transmission strategy based on the HARQ-ACK feedback received from relay nodes, eliminating the need for external intervention or complex manual resource management while maintaining both reliability and productivity
Data Source
AI summary
A user device, UE, for a wireless communication network, acts as a relaying entity so as to provide functionality to support connectivity between a transmitting entity and one or more receiving entities of the wireless communication network. Responsive to receiving a transmission from the transmitting entity and to relaying the transmission towards the receiving entity, the UE is to transmit a feedback to the transmitting entity, the feedback indicating a successful and/or non-successful receipt of the transmission at the receiving entity.