Broadcast Unicast Session Using Extension IDs to Avoid MAC Conflicts
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Solution Overview
Problem
The existing 4G V2X broadcast-based communication system faces challenges in supporting unicast services due to MAC identifier conflicts, leading to message parsing failures and unreliable data transmission.
Innovation Solution
A broadcast-based unicast session method that utilizes dynamically updated MAC identifiers and extension identifiers to distinguish devices, ensuring reliable unicast communication by avoiding MAC identifier conflicts and enabling unicast services in a broadcast system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If broadcast-based communication is used in 4G V2X system, then communication coverage and simplicity are improved, but device identification accuracy deteriorates due to MAC identifier conflicts
Solution Approach 1:
The patent segments the MAC identifier into two parts: a dynamic MAC identifier and a static extension identifier. The dynamic part changes periodically to prevent conflicts, while the static extension identifier provides unique device identification. This segmentation allows the system to maintain broadcast simplicity while achieving accurate device identification.
Solution Approach 2:
The patent adds another dimension to the identifier structure by introducing the extension identifier as an additional field. Instead of relying solely on the MAC identifier, the system now uses a two-dimensional identification space comprising both MAC identifier and extension identifier, thereby resolving the conflict between broadcast simplicity and identification accuracy.
2Adaptability or versatility
If unicast service is implemented in broadcast-based system, then communication flexibility is improved, but system complexity increases due to identifier conflict resolution
Solution Approach 1:
The patent applies preliminary action by having the responder device generate and include the extension identifier in advance within the response message. This pre-prepared identifier information eliminates the need for complex real-time conflict resolution, allowing the system to achieve unicast flexibility without significant complexity increase.
Solution Approach 2:
The extension identifier acts as an intermediary element that mediates between the broadcast communication mode and unicast service requirements. It provides the necessary device differentiation information without requiring fundamental changes to the broadcast-based communication framework, thus achieving flexibility with minimal complexity.
3Reliability
If dynamic MAC identifier is used to prevent conflicts, then communication reliability is improved, but message parsing complexity increases
Solution Approach 1:
The patent merges the dynamic MAC identifier and static extension identifier into a unified identification mechanism. Both identifiers are processed together in a single parsing operation, which simplifies the receiving end's processing logic compared to handling multiple separate identification mechanisms. This merging approach maintains reliability while avoiding excessive parsing complexity.
Data Source
AI summary
Embodiments of the present application provide a broadcast mechanism-based unicast session system, method, and apparatus, a computer-readable storage medium, and a vehicle, to establish a unicast session carried through broadcast between an initiator device and a responder device. An extension identifier of the initiator device or the responder device is added to a unicast request message, a unicast response message, or a unicast acknowledgment message sent in a broadcast manner, to avoid a session error caused by a MAC identifier conflict of the initiator device or the responder device, thereby improving reliability of the unicast session.