Sidelink Connection Establishment for NR V2X Unicast and Groupcast
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Solution Overview
Problem
Current NR-based systems lack effective mechanisms for one-to-one and one-to-many communication over sidelinks, particularly for advanced vehicle-to-everything (V2X) use cases, such as vehicular platooning, where direct connections between UEs are necessary for coordinated communication, but existing LTE-based V2X designs rely on broadcast and lack feedback mechanisms.
Innovation Solution
The proposed solution combines ProSe and RRC signaling over PC5-S and PC5-RRC interfaces to establish and manage sidelink connections for unicast and groupcast communications, enabling secure link establishment, data transfer, and control signaling between UEs, using messages that include QoS information and L2 destination identifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If broadcast-based communication is used for V2X, then coverage area is extended, but communication reliability and feedback mechanism are lost
Solution Approach 1:
The patent segments V2X communication into multiple modes: broadcast for wide coverage, groupcast for moderate coverage with feedback, and unicast for point-to-point reliable communication. This allows the system to select appropriate communication modes based on specific V2X service requirements, thereby maintaining reliability while preserving coverage benefits.
Solution Approach 2:
The patent introduces dynamic communication mode selection where UEs can switch between broadcast, groupcast, and unicast modes based on service requirements, channel conditions, and UE capabilities. This dynamic adaptation enables the system to optimize between coverage area and communication reliability for different V2X scenarios.
2Loss of time
If direct sidelink connection is established between UEs, then communication latency is reduced, but connection management complexity increases
Solution Approach 1:
The patent introduces the PC5-S interface as an intermediary layer for connection management between UEs. This dedicated signaling interface handles connection establishment, modification, and release procedures, thereby reducing the management complexity burden on application layers while enabling direct sidelink communication for low latency.
Solution Approach 2:
The patent segments connection management functions into different layers: PC5-S interface for connection control, PC5-RRC for radio resource control, and upper layers for application-specific management. This segmentation distributes complexity across multiple interfaces and layers, making direct sidelink connection management more tractable.
3Reliability
If secure link establishment is implemented, then communication security is improved, but signaling overhead increases
Solution Approach 1:
The patent implements preliminary security setup where security contexts are established during initial connection establishment via PC5-S and PC5-RRC interfaces. Security parameters, keys, and algorithms are pre-configured before actual data transmission begins, thereby ensuring secure communication while minimizing security-related signaling overhead during data transfer.
Data Source
AI summary
Some embodiments of this disclosure include apparatuses and methods for sidelink connection establishment design to support unicast and groupcast communication for NR V2X in a wireless communication system. The apparatuses and methods include at least generating an announcement of support for a unicast or a groupcast communication for a vehicle-to-everything (V2X) service, generating one or more connection establishment request messages for a secure link establishment to a second UE, to support a V2X communication to enable the V2X service, where the one or more connection establishment request message includes: a first connection establishment request message that is transmitted over a PC5-S interface, and a second connection establishment request message that is transmitted over a PC5-RRC interface. The apparatuses and methods further include at least processing a response message from the second UE that accepts or rejects the connection establishment request message for the secure link establishment.