V2X Terminal Feedback Multiplexing for Overlapping SPS and WAN PDSCH
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Solution Overview
Problem
In V2X communication systems, there is a challenge in efficiently transmitting feedback information on sidelink Semi Persistent Scheduling (SPS) and Wide Area Network (WAN) Physical Downlink Shared Channel (PDSCH) when their transmission times overlap, requiring effective multiplexing or priority ordering to manage overlapping transmission times.
Innovation Solution
A method where a V2X terminal determines overlap between sidelink SPS and WAN PDSCH transmission times, allowing for multiplexing or priority-based transmission of feedback information, utilizing acknowledgement (ACK)/negative acknowledgement (NACK) channel selection tables and Physical Uplink Control Channel (PUCCH) formats to efficiently transmit information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback information on sidelink SPS and WAN PDSCH is transmitted separately, then transmission reliability is improved, but transmission efficiency deteriorates due to overlapping transmission times and resource conflicts
Solution Approach 1:
The patent combines feedback information from sidelink SPS and WAN PDSCH into a single transmission resource when their transmission times overlap. The terminal device multiplexes both feedback payloads into one uplink transmission, resolving the resource conflict while maintaining the reliability of both feedback channels.
Solution Approach 2:
The patent implements dynamic resource allocation for feedback transmission by determining whether sidelink SPS and WAN PDSCH transmission times overlap. Based on this determination, the system dynamically switches between separate transmission (no overlap) and multiplexed transmission (overlap), optimizing both reliability and efficiency adaptively.
2Productivity
If feedback information is multiplexed, then transmission efficiency is improved, but information management complexity increases
Solution Approach 1:
The patent segments the multiplexing process into distinct steps: first determining whether transmission times overlap, then selectively applying multiplexing only when needed. This segmentation reduces management complexity by avoiding unnecessary multiplexing operations while maintaining efficiency benefits when overlap occurs.
Solution Approach 2:
The patent introduces an intermediary determination mechanism that assesses whether sidelink SPS and WAN PDSCH transmission times overlap before initiating multiplexing. This intermediary step simplifies information management by providing clear decision criteria, reducing the complexity of managing multiplexed feedback information.
3Reliability
If priority-based transmission is used, then transmission reliability of high-priority information is improved, but transmission completeness worsens due to potential omission of lower-priority feedback
Solution Approach 1:
The patent applies partial action by implementing priority-based transmission only when transmission time overlap occurs and resources are constrained. When no overlap exists, complete feedback transmission is maintained. This partial application of priority-based transmission ensures high-priority reliability where needed while preserving information completeness when resources are sufficient.
Data Source
AI summary
The present invention relates to a method for V2X (vehicle-to-everything) communication performed by means of a terminal in a wireless communication system, the method characterized by: determining whether or not the transmission points of feedback information for sidelink semi-persistent scheduling (SPS) information and feedback information for a wide area network (WAN) physical downlink shared channel (PDSCH) overlap; and transmitting the feedback information for the sidelink SPS information and the feedback information for the WAN PDSCH on the basis of the determination, wherein, if the transmission points of the feedback information for the sidelink SPS information and the feedback information for the WAN PDSCH overlap, the feedback information for the sidelink SPS information and the feedback information for the WAN PDSCH are transmitted by means of multiplexing or transmitted on the basis of priority.