V2X Terminal Power Allocation for Overlapping High-Priority Messages
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Solution Overview
Problem
In V2X communication, when transmitting signals with relatively low priority, power allocation often falls below the minimum required due to overlapping with high-priority signal transmission times, leading to reduced reliability and performance.
Innovation Solution
The method involves determining overlapping transmission times between high-priority and low-priority messages and either increasing the number of repeated transmissions for low-priority messages or applying higher transmission power to remaining transmissions to compensate for power reductions, ensuring reliable LP_V2XMSG transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is allocated based on signal priority, then high-priority signals receive sufficient power, but low-priority signals receive power below the minimum required
Solution Approach 1:
The patent implements dynamic power allocation by adjusting the number of repeated transmissions based on power availability. When power is insufficient for low-priority signals, the system increases repetition count rather than maintaining fixed power levels, thereby adapting transmission parameters to current power conditions while ensuring reliable delivery.
Solution Approach 2:
The patent changes the transmission parameter from fixed power allocation to variable repetition count. By modifying the number of repeated transmissions as a compensatory parameter, the system maintains overall transmission reliability even when power allocation to individual signals varies based on priority and availability.
2Reliability
If the number of repeated transmissions is increased for low-priority messages, then transmission reliability improves, but transmission time increases
Solution Approach 1:
The patent applies partial action by increasing repetitions only for low-priority messages when power is insufficient, rather than uniformly increasing all transmissions. This selective approach ensures reliable delivery of critical low-priority messages without unnecessarily extending transmission time for high-priority signals that already receive sufficient power.
Solution Approach 2:
The patent uses periodic repeated transmissions to ensure delivery of low-priority messages. By spacing repetitions over time rather than transmitting all at once, the system achieves reliable delivery while distributing the time cost across multiple intervals, allowing other transmissions to occur in between.
3Reliability
If transmission power is increased for remaining low-priority transmissions, then signal quality improves, but total power consumption increases
Solution Approach 1:
The patent applies local quality by providing enhanced power only to specific remaining transmissions of low-priority messages that require it, rather than uniformly increasing power for all transmissions. This targeted approach improves signal quality where needed while minimizing overall energy consumption by leaving other transmissions at standard power levels.
Data Source
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AI summary
The present invention provides a device-to-device (D2D) operation method performed by a terminal in a wireless communication system, the method comprising: determining whether a transmission time point of a first message having a high priority overlaps a transmission time point of a second message having a priority lower than that of the first message; and transmitting the second message using transmission power lower than transmission power of the first message on the basis of the determination, wherein the transmission of the second message is configured to repeat a predetermined number of times.