Sidelink Relay UE Data and Feedback Relaying
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently relaying data and feedback between user equipment (UEs) using sidelink communications, particularly in ensuring reliable transmission and decoding status feedback, especially in scenarios where traditional UE-to-network or UE-to-UE coverage is limited.
Innovation Solution
The implementation of methods and apparatuses for data and feedback relaying involve the use of sidelink user equipment (UEs) to transmit data packets and feedback requests, with relay UEs determining the appropriate transmission scheme, such as HARQ feedback or blind retransmissions, based on quality of service indicators, packet delay budgets, and channel availability, to ensure reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional UE-to-network or UE-to-UE coverage is used, then the communication system is simple, but the reliability of data transmission and feedback is insufficient in limited coverage scenarios
Solution Approach 1:
The patent introduces relay UEs as intermediary nodes that facilitate communication between remote UEs and the network. The relay UE receives data packets from a first UE, determines appropriate transmission schemes (HARQ feedback or blind retransmissions), and forwards them to a second UE, thereby improving reliability in limited coverage scenarios without requiring direct network connection for all UEs
Solution Approach 2:
The communication path is segmented into multiple hops involving relay UEs. Instead of direct UE-to-network or UE-to-UE communication, the system divides the transmission path into segments handled by different UEs, allowing each segment to operate independently and improve overall system reliability while managing complexity through modular relay functionality
2Productivity
If feedback transmissions are implemented via relays, then the spectral efficiency improves, but the complexity of managing feedback requests and decoding status increases
Solution Approach 1:
The patent merges feedback transmission with data relay functionality. The relay UE handles both data packets and feedback requests through a unified processing mechanism, where feedback requests are transmitted alongside data packets and decoded status information is forwarded together with data, thereby improving spectral efficiency while managing complexity through functional integration
Solution Approach 2:
The relay UE is designed with multi-functionality to handle diverse communication tasks including data transmission, feedback request handling, and decoding status forwarding. This universal approach allows a single relay UE to manage multiple types of information flow, improving spectral efficiency while reducing the need for separate dedicated feedback channels
3Reliability
If HARQ feedback or blind retransmissions are used, then the reliability of feedback transmission improves, but the time required for feedback processing increases
Solution Approach 1:
The patent implements dynamic selection of transmission schemes (HARQ feedback or blind retransmissions) based on real-time conditions. The relay UE determines the appropriate scheme dynamically rather than using a fixed approach, allowing optimization between reliability and time requirements based on current network conditions, packet delay budgets, and channel availability
Solution Approach 2:
The system changes operational parameters such as packet delay budgets and retransmission counts based on quality of service indicators and channel conditions. By adjusting these parameters dynamically, the system can optimize the balance between feedback transmission reliability and processing time, adapting to different scenario requirements without fixed time constraints
Data Source
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AI summary
Apparatuses, methods, and systems are disclosed for data and feedback relaying. One method (600) includes receiving (602), by a second sidelink user equipment, a first data packet from a first sidelink user equipment. The method (600) includes receiving (604) a feedback request with the first data packet. The method (600) includes transmitting (606), by the second sidelink user equipment, the first data packet to at least one third sidelink user equipment. The method (600) includes receiving (608) feedback about a decoding status of the first data packet from the at least one third sidelink user equipment. The method (600) includes determining (610) a result of the feedback request at the second sidelink user equipment based on the feedback. The method (600) includes transmitting (612) the result of the feedback request to the first sidelink user equipment.