Cell Reselection for V2X Service Matching
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Solution Overview
Problem
In the context of V2X communication, terminal devices face challenges in selecting cells that support their specific V2X service requirements, especially with the introduction of new radio (NR) communications systems, where cells may offer only LTE V2X, both LTE and NR V2X, or only NR V2X services, leading to instances where the selected cell does not meet the terminal device's service requirements.
Innovation Solution
A cell reselection method where a terminal device obtains and prioritizes parameters related to its air interface, determining the highest priority frequency information for communication, ensuring that it camps on a cell that supports the required V2X service by considering V2X frequency, service, standard, and quality of service information, and performs cell reselection if the initial cell does not support the service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal device sets the frequency priority of a cell as the highest priority once it finds a cell that supports V2X service, then the cell selection process is simplified and fast, but the selected cell may not support the terminal device's specific V2X service requirements
Solution Approach 1:
The terminal device performs preliminary actions by obtaining and storing air interface parameter information (including V2X frequency, service type, standard, and QoS parameters) before the cell selection process. This preliminary preparation enables the device to quickly evaluate whether a found cell supports its specific V2X service requirements without delaying the selection process, thus resolving the contradiction between selection speed and service support guarantee
Solution Approach 2:
The terminal device autonomously evaluates whether a found cell supports its specific V2X service requirements by comparing the cell's supported services with its own requirements using the pre-obtained air interface parameters. This self-service mechanism eliminates the need for complex network-side coordination, maintaining fast selection speed while ensuring reliable service support matching
2Ease of manufacture
If the terminal device continues to use the LTE system cell reselection manner regardless of RAT type, then the implementation is simple and consistent, but it cannot adapt to NR V2X services and may select cells that do not meet service requirements
Solution Approach 1:
The terminal device dynamically adjusts its cell selection strategy based on the RAT type of the found cell. When an LTE cell is found, the device applies LTE-specific selection criteria; when an NR cell is found, it applies NR-specific criteria. This dynamic adaptation allows the device to maintain simple implementation within each RAT context while achieving versatility across different RAT types and their respective V2X services
Solution Approach 2:
The terminal device changes its selection parameters based on the RAT type. It obtains air interface parameters specific to the RAT type (LTE or NR) including frequency, service type, standard, and QoS parameters. By changing these parameters according to the RAT type, the device maintains simple implementation procedures while achieving adaptability to different RAT-specific V2X service requirements
Data Source
AI summary
A first terminal device obtains a first parameter related to a first air interface, and then determines, based on the first parameter, that first frequency information of a second air interface has a highest priority, where the first air interface is a radio interface between the first terminal device and a second terminal device, and the second air interface is a radio interface between the first terminal device and a network device.