V2X PC5 Power Adjustment for Dense UE Environments
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Solution Overview
Problem
V2X communication systems face challenges with limited resources and high latency in proximity and Uu interfaces, leading to packet loss and deteriorated communication performance, especially in dense UE environments, with potential liability issues when risk identification accuracy is low.
Innovation Solution
A V2X communication method that adjusts the transmit power of the PC5 interface based on UE density information, using global information to determine power adjustments and reduce network load, thereby improving communication quality and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the V2X server sends V2X messages at high frequency (up to 50 Hz) to improve communication quality, then communication reliability is improved, but network resource consumption increases and latency increases
Solution Approach 1:
The patent implements dynamic transmit power adjustment based on UE density information. The network element receives UE density information and determines first information to adjust the PC5 interface transmit power dynamically. This allows the system to adapt transmission parameters to current network conditions, improving reliability when needed while reducing resource consumption when UE density is low, thereby resolving the contradiction between communication reliability and latency.
2Reliability
If the V2X server sends a large volume of data at high frequency, then communication quality is improved, but network resource limitations cause packet loss and performance deterioration
Solution Approach 1:
The patent changes the transmit power parameter of the PC5 interface based on UE density information. The network element determines first information including transmit power adjustments according to the received UE density information. This parameter change allows the system to maintain communication quality by adjusting power levels dynamically, reducing network resource consumption when UE density is low while ensuring sufficient power when density is high, thus resolving the contradiction between communication quality and network resource consumption.
3Reliability
If transmit power is increased to improve communication coverage and quality, then communication reliability is improved, but power consumption of UE increases
Solution Approach 1:
The patent implements a feedback mechanism where the network element receives UE density information and sends first information back to the UE to adjust transmit power. This feedback loop allows the system to optimize power consumption by providing network-guided transmit power adjustments based on actual UE density conditions, ensuring UEs transmit at appropriate power levels rather than always using maximum power, thus resolving the contradiction between communication quality and power consumption.
4Speed
If the V2X server uses local risk area information for transmit power adjustment, then response speed is improved, but measurement precision decreases leading to liability issues
Solution Approach 1:
The patent uses UE density information that represents global network conditions rather than just local risk area information. The network element determines first information based on comprehensive UE density data that reflects overall network state. This universal approach allows the system to maintain accurate risk identification while coordinating transmit power adjustments across the entire network, resolving the contradiction between response speed and measurement precision by using broader network context.
Data Source
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AI summary
Embodiments of this application provide a V2X communication method and an apparatus. The method includes: A first network element obtains UE density information of a first area in which target UE is located; and the first network element sends first information to the target UE based on the UE density information, where the first information is used by the target UE to adjust transmit power of a PC5 interface. The method provided in this application can improve V2X communication quality, and further reduce power consumption of UE. In addition, it can also be avoided that primary responsibility of an accident is transferred to a server, and information received by the UE is determined using global information, so that an error can be reduced.