V2X Power Control via Dynamic Parameter Adjustment
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Solution Overview
Problem
Current D2D communication technologies, standardized in 3GPP Rel-12/13, fail to meet the high-speed and high-reliability requirements of V2X communication, particularly in terms of time delay and communication reliability, due to resource collisions and in-band emissions in dense traffic environments.
Innovation Solution
A power control method for V2X communication that involves acquiring and determining transmission power for Physical V2X Shared Channel (PVSCH) and Physical V2X Control Channel (PVCCH) based on power control parameters, which include second basic open-loop power reflecting interrelationships between V2X UEs, allowing for dynamic adjustment of transmission power according to UE states such as movement velocity, relative distance, and density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Mode 2 D2D broadcast communication is used in V2X environment, then device autonomy and coverage are improved, but resource collision and in-band emission increase in high-density scenarios
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting transmission power based on multiple parameters including received signal strength, path loss, and pre-configured power values. The terminal selects from multiple pre-configured power parameters (first through fifth) depending on channel conditions and UE state, transforming a static power selection problem into a dynamic parameter optimization problem that resolves the contradiction between autonomy and reliability
2Reliability
If transmission power is increased to improve communication reliability, then receiving reliability improves, but mutual interference and in-band emission worsen
Solution Approach 1:
The patent implements parameter changes by establishing a multi-level power parameter configuration mechanism with five distinct power levels (first through fifth parameters). The system dynamically selects appropriate power levels based on channel conditions, UE state, and traffic density, enabling fine-grained power control that achieves reliable communication while minimizing interference through precise parameter optimization
Solution Approach 2:
The patent applies dynamics by making transmission power adaptive rather than static. The terminal continuously monitors channel conditions and adjusts power parameters in real-time based on received signal strength, path loss calculations, and pre-configured power tables. This dynamic adjustment mechanism allows the system to maintain reliability when needed while reducing power (and thus interference) when conditions permit
3Productivity
If centralized control (Mode 1) is used to avoid resource collision, then resource allocation efficiency improves, but system complexity and network dependency increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple power parameters (first through fifth) and resource pool configurations before V2X communication begins. The network provides advance configuration information including power parameters, resource pool settings, and selection criteria. This pre-configuration enables terminals to autonomously make optimal decisions without real-time network intervention, reducing system complexity while maintaining efficient resource allocation
Solution Approach 2:
The patent implements self-service by enabling terminals to autonomously select and adjust transmission power parameters based on pre-configured tables and current channel conditions. The terminal independently evaluates received signal strength, calculates path loss, and selects appropriate power parameters without continuous network control. This self-service mechanism reduces network dependency and system complexity while maintaining resource allocation efficiency
Data Source
AI summary
The present application provides a power control method in a V2X communication, comprising the following steps of: acquiring, by a UE, power control parameters of a Physical V2X Shared Channel (PVSCH) or a Physical V2X Control Channel (PVCCH) in a V2X communication, the power control parameters comprising a second basic open-loop power, the second basic open-loop power reflecting an interrelationship between different V2X UEs; and, determining, by the UE, a transmission power of the PVSCH or the PVCCH according to the acquired power control parameters. With the present application, the performance of the V2X communication can be improved, and the power consumption of a V2X terminal can be reduced.