V2X Terminal Path Switching via PDCP Parameter Mapping
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Solution Overview
Problem
Current V2X communication systems experience significant latency and service interruptions during path reselection or switching between direct and network device forwarding transmission paths due to differences in working mechanisms and parameter transfer processes between PC5 and Uu air interfaces.
Innovation Solution
A data transmission method where a terminal device obtains preconfigured configuration information including bearer identifiers and path configuration for sidelink and network device forwarding transmission paths, allowing dynamic switching between paths transparent to the upper layer, thereby reducing latency and avoiding service interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If path reselection or switching is performed between direct and network device forwarding transmission paths, then transmission reliability can be improved, but significant latency and service interruptions occur due to differences in working mechanisms and parameter transfer processes
Solution Approach 1:
The patent applies preliminary action by pre-configuring parameter mappings between PC5 and Uu air interfaces before path switching is needed. The network device provides mapping relationships between RLC layer parameters and PDCP layer parameters in advance, so when path switching occurs, the terminal can immediately use the pre-established mappings without performing time-consuming parameter transfers, thus reducing switching latency while maintaining transmission reliability
Solution Approach 2:
The patent uses the PDCP layer as an intermediary that bridges the PC5 and Uu air interfaces. By establishing parameter mappings at the PDCP layer that can be applied to both RLC layers (PC5 and Uu), the system creates a common interface that facilitates seamless path switching. This intermediary approach allows the terminal to switch paths without complex parameter reconfiguration, reducing latency while ensuring reliable transmission
2Reliability
If path reselection or switching is performed between direct and network device forwarding transmission paths, then transmission reliability can be improved, but service interruptions occur due to differences in working mechanisms and parameter transfer processes
Solution Approach 1:
The patent applies preliminary action by pre-configuring parameter mappings between PC5 and Uu air interfaces before path switching is needed. The network device provides mapping relationships between RLC layer parameters and PDCP layer parameters in advance, so when path switching occurs, the terminal can immediately use the pre-established mappings without performing time-consuming parameter transfers, thus reducing switching latency while maintaining transmission reliability
Solution Approach 2:
The patent uses the PDCP layer as an intermediary that bridges the PC5 and Uu air interfaces. By establishing parameter mappings at the PDCP layer that can be applied to both RLC layers (PC5 and Uu), the system creates a common interface that facilitates seamless path switching. This intermediary approach allows the terminal to switch paths without complex parameter reconfiguration, reducing latency while ensuring reliable transmission
Data Source
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AI summary
This application provides a data transmission method, a terminal device, and a network device. The method includes: obtaining, by a terminal device, first configuration information, where the first configuration information includes at least one first bearer identifier and path configuration information corresponding to the first bearer identifier, and the path configuration information corresponding to the first bearer identifier includes at least one of a sidelink transmission path and a network device forwarding transmission path; obtaining, by the terminal device, first service data and a second bearer identifier corresponding to the first service data; selecting, by the terminal device, a transmission path for the first service data based on the first bearer identifier, the second bearer identifier, and the path configuration information; and transmitting, by the terminal device, the first service data on the transmission path.