MAC-Layer PDU Mapping for NR V2X Transmission Modes
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Solution Overview
Problem
Existing V2X sidelink communication technologies lack in-depth research on how higher layers of terminal equipment should operate to support appropriate transmission modes in new radio (NR) technology, particularly for unicast and groupcast, beyond the broadcast mode in long-term evolution (LTE).
Innovation Solution
The media access control layer of the terminal equipment generates protocol data units (PDUs) where the service data units (SDUs) correspond to identical transmission modes, enabling the physical layer to transmit data appropriately, with determination or setting of transmission modes by upper layers, access stratum, or based on indication information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If V2X sidelink communication uses only broadcast mode in physical layer, then implementation is simple, but it cannot support unicast and groupcast transmission modes required by NR technology
Solution Approach 1:
The patent segments the transmission mode configuration into different layers: upper layer determines the transmission mode (broadcast/unicast/groupcast), access stratum configures the specific mode, and physical layer executes the transmission. This segmentation allows each layer to handle specific tasks, enabling NR transmission modes while maintaining manageable complexity through clear layer boundaries and responsibilities.
2Adaptability or versatility
If upper layer determines transmission mode, then transmission mode flexibility is improved, but layer coordination complexity increases
Solution Approach 1:
The upper layer performs preliminary action by determining the transmission mode in advance based on service requirements. This determination is then passed down to the access stratum and physical layer, allowing them to configure and execute without complex real-time coordination. The preliminary determination simplifies subsequent layer interactions while maintaining flexibility in transmission mode selection.
Solution Approach 2:
The patent implements dynamic transmission mode determination where the upper layer can adaptively select between broadcast, unicast, and groupcast modes based on service requirements, channel conditions, and network state. This dynamic capability is achieved through a configured indication mechanism that allows flexible mode selection while maintaining clear layer boundaries, thus managing complexity through structured dynamic behavior.
3Manufacturing precision
If access stratum configures transmission mode, then configuration precision is improved, but processing time increases
Solution Approach 1:
The access stratum performs preliminary configuration of transmission modes based on upper layer indications and service requirements. By pre-configuring the modes before actual data transmission, the system achieves precise mode configuration without incurring delays during active transmission. The pre-configured modes are stored and readily available for immediate use by the physical layer.
4Adaptability or versatility
If multiple transmission modes are supported, then service coverage is improved, but resource management complexity increases
Solution Approach 1:
The patent applies local quality by configuring different transmission modes for different service requirements and channel conditions. Each service can be assigned an appropriate transmission mode (broadcast for general announcements, unicast for dedicated communication, groupcast for group coordination) based on its specific needs. This localized optimization allows diverse service coverage while managing resource management complexity through service-specific configuration.
Data Source
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AI summary
This disclosure provides an apparatus and method for transmitting data of vehicle communication (V2X) services and a communication system. The apparatus includes: a first generating unit configured in a media access control (MAC) layer of the terminal equipment and configured to generate at least one protocol data unit (PDU) in a mode identical to a transmission mode to which a service data unit (SDU) contained in a PDU corresponds; and a first transmitting unit configured in the MAC layer and configured to transmit the PDU to a physical layer of the terminal equipment, and notify the transmission mode to which the PDU corresponds to the physical layer. This disclosure facilitates the physical layer to transmit data in a corresponding transmission mode. And furthermore, in this disclosure, the terminal equipment determines the transmission mode or set the transmission mode according to the indication information, and layers of the terminal equipment perform corresponding processing, which are simple in implementation.