V2X Policy Acquisition via Interface Indication After Policy Expiry
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Solution Overview
Problem
The core network reconfigures all Vehicle to Everything (V2X) communication policies when some policies expire, leading to unnecessary resource overhead due to inability to determine which interfaces need reconfiguration.
Innovation Solution
A method and apparatus that allows a terminal device to transmit an interface indication to a Policy Control Function (PCF) via an Access and Mobility Management Function (AMF), specifying which V2X communication policies over PC5 and/or Uu interfaces are expired, enabling targeted policy updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the terminal device autonomously determines whether to send a policy acquisition request after V2X communication policy expiry, then the network signaling overhead is reduced, but the policy acquisition timeliness and reliability deteriorate
Solution Approach 1:
The terminal device autonomously determines whether to send a policy acquisition request based on local conditions (PC5 interface usage status, policy expiry status) without requiring network intervention for each decision, thereby reducing signaling overhead while maintaining reliable policy acquisition
Solution Approach 2:
The network configures policy expiry indication parameters and the terminal provides feedback based on local PC5 interface usage status, enabling intelligent decision-making that balances signaling reduction with policy acquisition reliability
2Reliability
If the terminal device sends a policy acquisition request every time the V2X communication policy expires, then the policy acquisition timeliness is improved, but the network signaling overhead increases
Solution Approach 1:
Instead of always sending a policy acquisition request upon expiry, the terminal selectively sends requests only when necessary (when PC5 interface is configured or indicated), performing partial action that avoids unnecessary signaling while ensuring timely policy acquisition when needed
Solution Approach 2:
The network configures parameters including policy expiry indication and PC5 interface indication that change the terminal's behavior from fixed periodic requests to conditional requests based on current system state parameters
3Adaptability or versatility
If the network configures the terminal device with multiple V2X communication policies, then the adaptability of V2X communication is improved, but the device complexity increases
Solution Approach 1:
V2X communication policies are segmented into different types (PC5 interface policy, Uu interface policy) with distinct expiry conditions and acquisition triggers, making policy management more structured and less complex while maintaining comprehensive adaptability
Solution Approach 2:
The policy management system dynamically adapts to changing conditions by configuring different expiry indications and PC5 interface indications, allowing the terminal to adjust its behavior based on current network configuration and service requirements
Data Source
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AI summary
An embodiment of the present disclosure provides a method for obtaining a V2X communication policy on expiry of at least part of the V2X communication policy. The method includes: transmitting, by a terminal device via an AMF, an interface indication to a PCF, the interface indication being carried in a request message, and a bit value of the interface indication being used for indicating whether a policy for V2X communication over a PC5 interface and/or a policy for V2X communication over an Uu interface is requested; and receiving, by the terminal device from the PCF via the AMF, at least one of the policy for V2X communication over the PC5 interface and the policy for V2X communication over the Uu interface according to the bit value of the interface indication.