V2X Straight-Through Link Data Repeat Transmission
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Solution Overview
Problem
Current Internet of Vehicles systems face challenges in implementing repeat transmission of data when vehicles communicate with each other using straight-through links, which is essential for ensuring data reliability and latency reduction.
Innovation Solution
A data transmission method where a first terminal device sends multiple MAC protocol data units carrying the same data over different carriers, instructed by network device information, to repeatedly send the data to a second terminal device through a straight-through link.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repeat transmission of data is implemented through straight-through link in V2X communication, then data transmission reliability is improved, but device complexity increases due to need for multiple MAC PDUs and carrier management
Solution Approach 1:
The patent implements dynamic activation and deactivation of repeat transmission function through network device control. The terminal device can switch between single transmission and repeat transmission modes based on network conditions and service requirements, making the system adaptable rather than statically complex
Solution Approach 2:
The patent changes the parameter of transmission redundancy by sending multiple MAC PDUs with different redundancy versions (RV0, RV1, RV2, RV3) of the same transport block. This allows the receiver to combine multiple versions to recover the original data, improving reliability without requiring completely separate transmission paths
2Reliability
If multiple MAC protocol data units are sent over different carriers for repeat transmission, then data transmission reliability is improved, but loss of time increases due to multiple transmission cycles
Solution Approach 1:
The patent prepares multiple redundancy versions of the data in advance before transmission. When repeat transmission is needed, the terminal device can immediately send alternative versions without needing to re-encode or re-process the data, reducing the time penalty of repeat transmission
Solution Approach 2:
The patent transitions from time-based repeat transmission (sending same data sequentially) to parallel carrier-based transmission (sending different redundancy versions simultaneously across multiple carriers). This dimensional change allows multiple transmission attempts to occur concurrently rather than sequentially, reducing latency
3Reliability
If repeat transmission is activated by network device, then data transmission reliability is improved, but use of energy increases due to additional transmission operations
Solution Approach 1:
The patent implements feedback-based repeat transmission where the network device monitors transmission status and sends activation/deactivation instructions based on received data quality, channel conditions, and service requirements. This ensures energy is consumed for repeat transmission only when actually needed, rather than continuously
Solution Approach 2:
The patent uses partial repeat transmission by sending only the necessary redundancy versions based on actual channel conditions and service requirements. Not all services or all data packets require full repeat transmission, so the system applies repeat transmission selectively to the minimum necessary cases
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: receiving, by a first terminal device, first information sent by a network device, where a first element of the first information includes one or more of the following identifiers: a data priority identifier of to-be-sent data, an identifier of a service type to which the to-be-sent data belongs, an identifier of a quality of service flow to which the to-be-sent data belongs, a destination address identifier of the to-be-sent data, an identifier of a logical channel group in which n logical channels are located, n carrier identifiers corresponding to the n logical channels, and an identifier of a PDCP entity; encapsulating, by the first terminal device, n pieces of data that include the to-be-sent data and that are of the n logical channels respectively into n MAC PDUs based on the first information; and sending, by the first terminal device through a straight-through link, the n MAC PDUs using n carrier bearers to a second terminal device. This application can implement repeat transmission of data when V2X communicates with each other by using the straight-through link.