Sidelink Sync Signal Detection for High-Speed V2V Terminals
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Solution Overview
Problem
Existing 3GPP standards are inadequate for implementing vehicle-to-vehicle (V2V) communication, particularly for terminals moving at high speeds, as they do not effectively handle the detection of synchronization reference signals in scenarios where a terminal is out of coverage of a base station.
Innovation Solution
A method and terminal configuration for detecting sidelink synchronization signals (SLSS) from neighboring terminals, involving determining transmission periods and numbers of SLSS transmissions, and discarding transmissions during specific time durations to optimize synchronization reference signal detection, with the terminal equipped with an RF unit and processor for controlling SLSS transmission and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal transmits SLSS continuously according to existing 3GPP standards, then the transmission coverage is maintained, but the detection probability of synchronization reference signal decreases for high-speed moving terminals
Solution Approach 1:
The patent applies periodic action by configuring the terminal to transmit SLSS at specific periodic intervals rather than continuously. The transmission period is set based on the terminal's moving speed, creating a rhythmic transmission pattern that ensures synchronization signals are transmitted at optimal intervals for high-speed scenarios, thereby improving detection probability while reducing unnecessary transmissions.
Solution Approach 2:
The patent implements dynamics by making the SLSS transmission period adjustable according to the terminal's moving speed. The system dynamically adapts the transmission configuration - terminals moving at higher speeds are assigned different transmission periods compared to stationary or slow-moving terminals, allowing the system to optimize performance for each specific motion scenario.
2Measurement precision
If the terminal transmits SLSS at frequent intervals to improve synchronization accuracy, then the synchronization precision is improved, but the energy consumption increases
Solution Approach 1:
The patent applies parameter changes by adjusting the SLSS transmission period as a key parameter based on terminal conditions. Instead of using fixed frequent transmission intervals, the system changes the transmission period parameter according to the terminal's moving speed and synchronization requirements, achieving optimal synchronization accuracy while minimizing energy consumption by avoiding excessive transmissions.
3Use of energy by moving object
If the terminal transmits SLSS with long period to save energy, then the energy consumption is reduced, but the detection probability decreases for high-speed terminals
Solution Approach 1:
The patent resolves this contradiction through dynamic adaptation of the transmission period based on terminal moving speed. For high-speed terminals, the system dynamically sets shorter transmission periods to ensure detection probability, while for low-speed or stationary terminals, longer periods are used to conserve energy. This dynamic configuration allows the system to optimize both energy consumption and detection probability for different operational scenarios.
Data Source
AI summary
One disclosure of the present specification provides a method in which a terminal receives a sidelink synchronization signal (SLSS) from a neighboring terminal. The method includes: determining by the terminal a period and the number of times of transmitting the SLSSs; and transmitting by the terminal the SLSS during a first time duration defined on the basis of the period and the number of times. The transmitting of the SLSS may include detecting by the terminal an SLSS transmitted by the neighboring terminal in a second time duration within the first time duration. The terminal may discard transmission of an SLSS corresponding to the second time duration within the first time duration. The second time duration may be included in the first time duration, and the second time duration is less than or equal to 40% of the first time duration.