LTE-V and DSRC Coexistence via Channel Indication
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Solution Overview
Problem
LTE-V terminals in ITS systems face challenges in detecting DSRC terminals, leading to inefficient channel usage and high energy consumption due to interference and incomplete channel switching, especially when some terminals fail to detect DSRC terminals on a channel.
Innovation Solution
A communication method where terminals send indication information on channels to determine the presence of DSRC terminals, allowing LTE-V terminals to switch to alternative channels, thereby avoiding interference and optimizing channel resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If LTE-V terminals perform channel detection and switching to avoid DSRC terminals, then interference between transmission technologies is reduced, but energy consumption increases due to continuous detection and multiple channel monitoring
Solution Approach 1:
DSRC terminals perform preliminary channel occupation and send indication information before LTE-V terminals attempt to use the channel. This preliminary action allows LTE-V terminals to detect the indication information and switch channels in advance, avoiding the need for continuous extensive channel detection and reducing energy consumption while preventing interference.
Solution Approach 2:
Indication information acts as an intermediary signal between DSRC and LTE-V terminals. The indication information transmitted on the channel serves as a mediator that informs LTE-V terminals of DSRC terminal presence, enabling coordinated channel usage without direct detection between different transmission technology terminals, thus reducing interference and detection overhead.
2Reliability
If all LTE-V terminals monitor all available channels to ensure communication continuity, then communication reliability is improved, but energy consumption increases significantly
Solution Approach 1:
The patent extracts the channel detection function from all LTE-V terminals and concentrates it only in DSRC terminals. DSRC terminals perform channel detection and send indication information, while LTE-V terminals simply monitor for indication information. This extraction reduces the detection burden on battery-constrained handheld terminals while maintaining communication reliability through the indication information mechanism.
3Object-affected harmful factors
If LTE-V terminals switch to alternative channels when DSRC terminals are detected, then channel interference is avoided, but system capacity decreases due to reduced available channels for LTE-V communication
Solution Approach 1:
The patent segments the channel usage by transmission technology type: channels occupied by DSRC terminals are designated for DSRC use, while channels without DSRC presence remain available for LTE-V communication. This segmentation is dynamically managed through indication information, allowing flexible channel allocation that avoids interference while maximizing overall system capacity by preventing unnecessary channel abandonment.
Data Source
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AI summary
Embodiments of the present invention relate to a communication method and a terminal. The method includes: receiving, by a first terminal, first information on a first channel, where the first information carries at least one first sequence of a second terminal, the first terminal supports a first transmission technology, the second terminal supports a second transmission technology, and the first sequence of the second terminal is used to indicate that the first channel is used by a terminal that supports the second transmission technology; determining, by the first terminal, first indication information based on the first sequence; and sending, by the first terminal, the first indication information on the first channel, where the first indication information is used to indicate that the first channel is used by the terminal that supports the second transmission technology. According to the communication method provided in the embodiments of the present invention, terminals that support different transmission technologies can better coexist on a plurality of shared channels, and interference between the different transmission technologies can be avoided.