UE Power Control for Overlapping Uu and V2X Transmissions
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Solution Overview
Problem
User equipment (UE) in V2X communications faces challenges in efficiently assigning transmission power across multiple carriers, particularly when transmission power is limited, and needs to manage both LTE cellular network and V2X transmissions simultaneously.
Innovation Solution
The UE determines and assigns transmission power based on the presence of Uu uplink and V2X transmissions in a subframe, using priority policies to allocate power when resources are limited, potentially dropping or reducing lower-priority transmissions to ensure maximum power is used effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits both Uu uplink and V2X signals simultaneously on multiple carriers, then the data transfer capability is improved, but the transmission power is insufficient and interference increases
Solution Approach 1:
The patent implements dynamic power allocation by continuously monitoring buffer status, channel conditions, and transmission priorities across multiple carriers. The power allocation ratios are dynamically adjusted based on real-time network conditions and QoS requirements, allowing the system to optimize power distribution between Uu and V2X transmissions adaptively rather than using fixed allocation schemes
Solution Approach 2:
The system changes transmission parameters including power allocation ratios, modulation schemes, and coding rates based on channel quality indicators and buffer status. By adjusting these parameters dynamically, the system can maintain reliable data transfer across multiple carriers while adapting power consumption to available transmission power levels
2Adaptability or versatility
If the UE allocates power to multiple carriers simultaneously, then the communication versatility is improved, but the power per carrier is reduced causing transmission reliability to deteriorate
Solution Approach 1:
The patent segments the total transmission power into distinct power allocation ratios for different carriers and transmission types (Uu uplink vs. V2X). Each carrier receives a specific power portion determined by its priority, buffer status, and channel conditions, allowing versatile multi-carrier operation while ensuring each segment receives sufficient power for reliable transmission
Solution Approach 2:
The system employs feedback mechanisms where the UE monitors transmission outcomes, channel quality, and buffer status on each carrier. Based on this feedback, the power allocation ratios are adjusted in subsequent transmission intervals to maintain optimal reliability across all active carriers while adapting to changing communication requirements
3Loss of energy
If the UE uses priority policies to drop lower-priority transmissions, then the power efficiency is improved, but the transmission complexity increases
Solution Approach 1:
The patent establishes preliminary power allocation ratios and priority policies before actual transmissions occur. The UE pre-configures power distribution rules based on QoS requirements and carrier priorities, so that when transmissions are needed, the power allocation can be executed efficiently without complex real-time decision-making, reducing both power waste and processing complexity
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure provides a method and a device of power control for a Uu uplink transmission and a V2X transmission. Specifically, the present disclosure provides a method for determining the transmission power based on the circumstance of synchronous/asynchronous carriers, a minimum time delay of preparing the transmission power of the V2X and Uu uplink transmission, and an actual time delay of V2X from a resource reselection to a transmission. By this method, the transmission efficiency of the V2X and the Uu uplink transmission can be ensured.