UE Message Order Detection for Lost V2X Messages
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Solution Overview
Problem
The challenge in wireless communication systems, particularly in V2X scenarios, is the detection and management of lost messages during platooning operations, which can lead to inefficiencies and increased message overhead.
Innovation Solution
A method for a user equipment (UE) to determine the occurrence of lost messages based on the message transmission order and reception times, allowing for retransmission requests and channel access authority allocation among UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If message transmission order is monitored to detect lost messages, then communication reliability is improved, but message overhead and processing complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-assigning transmission order identifiers to UEs before actual message transmission. Each UE receives a predetermined transmission order value that indicates its position in the transmission sequence, allowing the receiving UE to detect lost messages by comparing expected versus received order identifiers without complex real-time tracking of transmission states.
Solution Approach 2:
The patent implements feedback by having the receiving UE monitor the transmission order identifiers of received messages and detect discrepancies between expected and actual order sequences. When a gap in the order sequence is detected, the receiving UE can request retransmission of the specific lost message, creating a closed-loop feedback mechanism that improves reliability without requiring the transmitting UE to maintain complex state information.
2Reliability
If retransmission requests are implemented for lost messages, then message delivery completeness is improved, but communication latency increases
Solution Approach 1:
The patent reduces retransmission latency by pre-configuring transmission order identifiers and detection criteria before message exchange begins. This allows the receiving UE to immediately detect lost messages upon receipt of subsequent messages without requiring complex analysis or additional signaling overhead, enabling faster retransmission requests compared to conventional approaches that monitor message arrival times and patterns.
3Productivity
If channel access authority is allocated dynamically among UEs, then communication efficiency is improved, but control signaling overhead increases
Solution Approach 1:
The patent extracts the channel access authority indication from complex dynamic control signaling by using predetermined transmission order identifiers that implicitly convey turn-taking information. Instead of requiring separate control messages for channel access grants, the system embeds access authority information in the message sequence identifiers themselves, reducing control signaling overhead while maintaining efficient turn-based channel access.
Data Source
AI summary
An embodiment relates to a method for operating a user equipment (UE) in a wireless communication system, the method comprising the steps of: receiving, by a first UE, a plurality of messages from a plurality of UEs; and determining, by the first UE, whether there is a lost message, on the basis of the order in which the plurality of UEs have transmitted the plurality of messages and the order of reception times of the plurality of messages.