V2X Sidelink Cell Reselection in RRC Inactive Mode
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Solution Overview
Problem
Current 5G communication systems face challenges in handling cell reselection and frequency priorities for vehicle-to-everything sidelink (V2X SL) communication, particularly in radio resource control (RRC) inactive modes, which hinders the provision of enhanced services like self-driving and remote driving.
Innovation Solution
A method and apparatus that allow a terminal to identify and prioritize frequencies for cell selection and reselection, enabling V2X SL communication by configuring both new radio (NR) and V2X sidelink communications, even in RRC inactive modes, by determining the highest priority frequency for cell reselection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal prioritizes cell reselection for V2X SL communication in RRC inactive mode, then communication reliability for enhanced services is improved, but device complexity increases due to multiple frequency configuration management
Solution Approach 1:
The terminal performs cell reselection and frequency priority determination in advance while in RRC inactive mode, before V2X communication is actually needed. This preliminary action ensures that when V2X service is required, the terminal is already camped on a suitable cell with proper frequency priorities configured, thus guaranteeing communication reliability without requiring complex real-time decision-making mechanisms.
Solution Approach 2:
The terminal autonomously determines frequency priorities and performs cell reselection without requiring continuous network control or complex coordination with base stations. The terminal uses stored configuration information and autonomous algorithms to select appropriate frequencies for V2X communication, reducing the need for complex network-terminal interaction mechanisms while maintaining reliability.
2Speed
If the terminal maintains RRC connected state for frequent cell reselection, then cell reselection speed is improved, but energy consumption increases
Solution Approach 1:
The terminal performs cell reselection operations in advance while in RRC inactive mode, before actual V2X communication begins. This preliminary cell reselection ensures that when V2X service starts, the terminal is already positioned on the correct cell, eliminating the need for rapid repeated reselection operations that would require maintaining RRC connected state and consuming excessive energy.
Solution Approach 2:
The terminal dynamically transitions between RRC inactive and RRC connected states based on service requirements. During periods when V2X communication is not active, the terminal remains in the lower-power RRC inactive state. Only when V2X service is actually needed does the terminal transition to RRC connected state, optimizing the balance between reselection speed and energy consumption.
Data Source
AI summary
A communication technique for convergence of a 5th generation (5G) communication system is provided, for supporting a higher data transmission rate beyond that supported by a 4th generation (4G) system, with internet of things (IoT) technology, and a system therefor. The disclosure may be applied to an intelligent service (for example, a smart home, smart building, smart city, smart car or connected car, health care, digital education, retail business, security and safety-related service, etc.), based on 5G communication technology and IoT-related technology. A method and an apparatus for handling cell reselection and frequency priorities for vehicle to everything sidelink (V2X SL) communication of a user equipment (UE) are provided.