Sidelink Feedback Resource Allocation for Wireless Reliability
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE, face challenges in reliable sidelink communication between mobile devices without centralized controllers, leading to issues like interference, reduced message reliability, and inefficient resource utilization due to the lack of effective feedback mechanisms in device-to-device (D2D) and vehicle-to-everything (V2X) communications.
Innovation Solution
The implementation of a method that allows mobile devices to transmit scheduling information and data packets using sidelink control channels, with integrated acknowledgement (ACK)/negative acknowledgement (NACK) resources, enabling direct feedback between devices without relying on base stations, and utilizing techniques like hybrid automatic repeat request (HARQ) for improved transmission reliability and resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mobile devices communicate directly without centralized controllers, then resource utilization efficiency improves and base station dependencies are reduced, but interference increases and message reliability deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where receiving devices send acknowledgments (ACK/NACK) to transmitting devices to confirm successful packet reception. This feedback loop enables automatic retransmission when packets are lost or corrupted, significantly improving message reliability in decentralized sidelink communications without requiring base station intervention.
Solution Approach 2:
The system enables devices to autonomously manage their own communications through self-scheduling and self-organized resource allocation. Devices independently determine transmission parameters, select resources, and handle retransmissions without centralized control, maintaining high resource utilization efficiency while ensuring reliable delivery through built-in error handling mechanisms.
2Adaptability or versatility
If ACK/NACK resources are dynamically determined from resource pools, then resource flexibility and adaptability improve, but resource collision probability increases
Solution Approach 1:
The patent employs preliminary resource selection and reservation mechanisms where devices pre-determine ACK/NACK resources before actual transmission occurs. By advance planning and coordination, devices can select resources that minimize collision probability while maintaining flexibility to adapt to different communication scenarios and channel conditions.
3Productivity
If scheduling information is broadcast on control channels, then transmission efficiency improves and resource overhead is reduced, but interference from multiple transmitters increases
Solution Approach 1:
The patent implements local quality control by allowing devices to transmit scheduling information using locally optimized parameters such as transmit power, modulation scheme, and resource selection based on channel conditions and interference levels. This localized adaptation reduces overall interference while maintaining high transmission efficiency for each individual link.
Data Source
AI summary
In certain embodiments, a method includes, by a first mobile device, obtaining a data packet and determining, from a first set of resources, control resources for transmitting scheduling information associated with the data packet. The control resources include a physical sidelink control channel (PSCCH). The method includes determining, by the first mobile device from a second set of resources, acknowledgement (ACK)/negative acknowledgement (NACK) resources associated with the data packet and related to the control resources. The scheduling information includes transmission information for transmitting the data packet and an indication of the ACK/NACK resources. The method includes transmitting, by the first mobile device to a second mobile device, the scheduling information on the control resources and the data packet on a set of resources indicated by the transmission information and listening, by the first mobile device, for an ACK/NACK transmitted by the second mobile device on the ACK/NACK resources.