Network-Triggered V2X Parameter Updates Across 5G and 4G
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Communication failures occur when a terminal device uses an expired V2X parameter, particularly when transitioning between 5G and 4G communications systems.
Innovation Solution
A communication method and apparatus that involves network elements like the V2X control network element, user data management network element, and policy control function (PCF) to update and deliver updated V2X parameters to terminal devices, ensuring timely parameter updates based on indication and notification information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the terminal device uses the V2X parameter obtained in the 5G communications system when moving to the 4G communications system, then the parameter acquisition procedure is simplified, but the communication fails because the parameter is expired
Solution Approach 1:
The network side introduces a parameter validity status indication mechanism that provides feedback to the terminal device. The V2X parameter update indication information or notification information explicitly indicates whether the obtained V2X parameter is still valid, allowing the terminal device to adjust its communication behavior accordingly - either continue using the current parameter or trigger a re-acquisition procedure.
Solution Approach 2:
The network side performs preliminary validation of V2X parameter validity before the terminal device attempts communication. By sending parameter update indication information or notification information in advance, the network prevents the terminal device from using expired parameters, thereby avoiding communication failure before it occurs.
2Reliability
If the terminal device triggers parameter re-acquisition when moving to 4G communications system, then communication reliability is improved, but the parameter acquisition procedure becomes complex and time-consuming
Solution Approach 1:
The network side provides feedback through parameter update indication information or notification information that tells the terminal device whether re-acquisition is necessary. This feedback mechanism eliminates the need for the terminal device to always trigger re-acquisition, simplifying the procedure while maintaining reliability.
Solution Approach 2:
The terminal device autonomously determines whether to re-acquire parameters based on network-provided indication information. When the indication shows parameters are valid, the device continues using them without additional procedures. When invalid, the device triggers re-acquisition only when necessary, optimizing the balance between reliability and procedural simplicity.
3Reliability
If the network side sends parameter update indication information to the terminal device, then communication reliability is improved, but the network complexity increases
Solution Approach 1:
The parameter update indication information and notification information serve multiple functions: they indicate parameter validity status, trigger parameter re-acquisition when needed, and provide a unified mechanism for both 5G-to-4G and 4G-to-5G transitions. This multi-functionality reduces the need for separate handling procedures, thereby limiting the increase in network complexity.
Solution Approach 2:
The V2X control network element acts as an intermediary between the user data management network element and the terminal device. It receives parameter update indications from the management element and translates them into notification information for the terminal device, simplifying the overall network architecture while maintaining reliability.
Data Source
AI summary
A communication method, a communications apparatus, and a system are provided, applied to the vehicle-to-everything V2X field, so that a terminal device can obtain an updated V2X parameter, to resolve a problem that communication fails because the terminal device uses an expired V2X parameter. The communication method includes: receiving, by a V2X control network element, parameter update indication information sent by a user data management network element, where the parameter update indication information indicates that a V2X parameter of a terminal device is updated; and sending, by the V2X control network element, an updated V2X parameter to the terminal device based on the parameter update indication information.