V2X ProSe Direct Discovery Protocol for Low Latency Communication
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Solution Overview
Problem
Current cellular systems, such as 3GPP LTE, lack the capability to enable direct communication between V2X devices within a relatively short range (50 to 350 meters) with low latency, and existing ProSe architecture and protocols are not scalable to meet the demands of Vehicle-to-Anything (V2X) communications in terms of latency and the number of vehicles supported.
Innovation Solution
The introduction of a new ProSe direct discovery protocol and interface (PC5) that enables direct data communication between V2X devices over the MAC and PHY layers, minimizing overhead and latency, and the implementation of enhanced ProSe functionality to support periodic and event-driven Basic Safety Messages (BSM) exchange, allowing V2X devices to operate in cooperative or listen-only modes based on service registration and authorization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct communication between V2X devices is enabled using existing cellular systems, then device connectivity is achieved, but latency is too high and the system cannot support large numbers of vehicles efficiently
Solution Approach 1:
The patent segments the communication path by introducing a direct device-to-device interface (PC5) that operates independently from the traditional cellular network path. This segmentation allows V2X devices to communicate directly without routing through base stations, thereby reducing latency while maintaining reliable connectivity for large numbers of vehicles.
Solution Approach 2:
The patent introduces a new direct communication interface (PC5) as an intermediary channel between V2X devices. This intermediary path bypasses the traditional cellular network infrastructure, enabling low-latency direct communication while the network retains oversight capabilities for authorization and management.
2Adaptability or versatility
If existing ProSe protocols are used for V2X communication, then basic discovery functionality is provided, but the system is not scalable to meet V2X demands
Solution Approach 1:
The patent implements dynamic operation modes that allow V2X devices to switch between cooperative mode (full bidirectional communication) and listen-only mode (unidirectional reception). This dynamic adaptability enables the system to scale efficiently by allowing devices to participate at different levels based on their capabilities and network conditions, thereby supporting large numbers of vehicles while maintaining essential discovery functionality.
3Loss of time
If direct data communication is implemented between V2X devices, then latency is reduced, but protocol complexity increases
Solution Approach 1:
The patent creates a universal direct communication interface (PC5) that handles multiple functions including data transmission, discovery, and authorization within a single standardized protocol framework. This multi-functionality reduces overall system complexity by consolidating what would otherwise require multiple separate mechanisms, while still achieving low-latency direct communication.
Data Source
AI summary
Technology for a vehicle-to-anything (V2X) a user equipment (UE) to perform V2X communication within a wireless communication network is disclosed. The V2X UE can process, by the V2X UE, for transmission to a V2X function a V2X service registration request having one or more parameters to confirm and authorize the V2X service registration request. The V2X UE can process a V2X service registration authorization response and V2X operation parameters, received by from the V2X function, for permitting the V2X UE to operate in one of a plurality of V2X operation modes. The V2X UE can operate in the one of the plurality of V2X operation modes using the V2X operation parameters.