V2X Signaling Context Retention for PC5 Idle-Mode Communication
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Solution Overview
Problem
In V2X communication systems, the challenge is how to ensure that a V2X terminal maintains context information for PC5 interface communication when transitioning from a connected mode to an idle mode, particularly when the core network releases connections due to lack of data or signaling requirements, leading to resource allocation issues.
Innovation Solution
A method where a core network device receives indication information from a V2X terminal to skip releasing signaling connections, ensuring the V2X terminal maintains context information, allowing the access network to allocate PC5 interface resources based on this context.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the core network device releases the signaling connection and communication connection after registration to save resources, then resource utilization is improved, but the V2X terminal loses context information needed for PC5 interface communication
Solution Approach 1:
The patent extracts the V2X terminal context information from the access network device and transfers it to the core network device before releasing the connection. This allows the access network device to release resources while the core network device retains the necessary context information for future PC5 interface communication resource allocation
Solution Approach 2:
The core network device acts as an intermediary that stores the V2X terminal context information between the access network device and the terminal. When the terminal needs PC5 interface resources, the core network device can provide the context information to the access network device, enabling resource allocation without maintaining a persistent connection
2Productivity
If the access network device deletes stored context of the V2X terminal to release resources, then resource efficiency is improved, but the ability to allocate PC5 interface resources is deteriorated
Solution Approach 1:
The patent moves the context information storage from the access network device level to the core network device level, changing the dimensional location of data storage. This allows the access network device to release local resources while the core network device maintains the information in a different operational dimension
3Use of energy by moving object
If the V2X terminal transitions to idle mode to conserve resources, then energy consumption is reduced, but context information for PC5 interface communication is lost
Solution Approach 1:
The core network device performs preliminary action by storing the V2X terminal context information before the terminal transitions to idle mode. This preliminary storage ensures that when the terminal needs to communicate via PC5 interface from idle mode, the context information is already available for rapid resource allocation
Data Source
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AI summary
Embodiments of this application disclose a communications method, apparatus, and system, and relate to the communications field, so that an access network device reserves a context of a V2X terminal, thereby ensuring that the V2X terminal implements PC5 interface communication. The method includes: A core network device obtains capability information used to indicate that the V2X terminal supports PC5 interface communication. The core network device maintains or skips releasing a signaling connection between the V2X terminal and the core network device based on the obtained capability information after completion of registration for the V2X terminal.