V2V Terminal SLSS Transmission Evaluation Time
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Solution Overview
Problem
The existing technologies face challenges in applying Device-to-Device (D2D) communication directly to Vehicle-to-Everything (V2X) scenarios due to the higher speed of V2X terminals, which complicates the determination of the evaluation time for transmitting sidelink synchronization signals (SLSS) based on the conventional threshold values established for lower-speed movements.
Innovation Solution
A method for a vehicle-to-vehicle (V2V) terminal to calculate the evaluation time for transmitting SLSS by adjusting the number of discontinuous reception (DRX) cycles based on the DRX cycle length, specifically for RRC idle and connected states, to accommodate higher speeds, ensuring timely and accurate SLSS transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the conventional evaluation time for SLSS transmission is used (based on D2D threshold values), then the system maintains compatibility with existing D2D communication protocols, but the evaluation time becomes insufficient for V2X terminals moving at higher speeds, leading to inaccurate threshold comparisons and failed synchronization
Solution Approach 1:
The patent applies dynamics by making the evaluation time variable rather than fixed. The evaluation time is dynamically adjusted based on the DRX cycle length, which itself adapts to the terminal's movement state. For RRC idle terminals, the evaluation time is set to 3 DRX cycles, while for RRC connected terminals, it is set to 6 DRX cycles. This dynamic adjustment ensures the evaluation time is sufficient for high-speed V2X terminals while maintaining protocol compatibility.
Solution Approach 2:
The patent changes the parameter of evaluation time based on different operational parameters (DRX cycle length and RRC state). By introducing the DRX cycle length as a basis for calculating evaluation time, the system adapts to varying speed conditions without requiring a complete protocol overhaul. The threshold comparison is performed on measurements taken during this dynamically determined evaluation period.
2Reliability
If the evaluation time is extended to accommodate high-speed V2X terminals, then accurate SLSS transmission is achieved, but the system complexity increases due to the need to differentiate between RRC idle and connected states and calculate varying evaluation times
Solution Approach 1:
The patent applies self-service by having the terminal determine its own evaluation time based on its current RRC state and configured DRX cycle length. The terminal autonomously selects between 3 DRX cycles for idle state or 6 DRX cycles for connected state without requiring complex network coordination. This self-determination simplifies the overall system architecture while ensuring reliable SLSS transmission.
Solution Approach 2:
The patent segments the terminal operation into distinct states (RRC idle and RRC connected), each with its own evaluation time calculation rule. This segmentation allows the system to handle different mobility scenarios with simplified, state-specific logic rather than requiring a single complex evaluation mechanism. The transceiver unit implements this segmentation by selecting the appropriate DRX cycle multiplier based on the current RRC state.
3Measurement precision
If the patent applies different DRX cycle multipliers for RRC idle and connected states, then accurate evaluation time is achieved for each state, but the control mechanism becomes more complex with multiple state-dependent parameters
Solution Approach 1:
The patent uses dynamics to automatically adjust the evaluation time based on the terminal's RRC state. The system transitions between different evaluation time configurations (3 DRX cycles for idle, 6 DRX cycles for connected) dynamically as the terminal's state changes. This dynamic adaptation maintains measurement precision without requiring manual reconfiguration or complex operator intervention.
Solution Approach 2:
The patent creates a universal evaluation time calculation mechanism that works for both RRC idle and connected states by using the DRX cycle length as a common basis. The same transceiver unit and measurement process are used for both states; only the multiplier (3 or 6) changes based on state. This multi-functional approach maintains ease of operation while achieving state-specific accuracy.
Data Source
AI summary
The disclosure of the present invention proposes a method for transmitting a sidelink synchronization signal (SLSS). The method may be performed by a vehicle-to-vehicle (V2V) terminal and comprise: performing measurements during a predetermined evaluation time; determining whether values resulting from performing the measurements are below a threshold value; and if the values resulting from performing the measurements during the predetermined evaluation time are below the threshold value, transmitting the SLSS to a neighboring V2V terminal. If the V2V terminal is in radio resource control (RRC) idle state and if the V2V terminal is configured to use 1.28 s or 2.56 s of a discontinuous reception (DRX) cycle length, the V2V terminal may calculate the predetermined evaluation time by using the number of DRX cycles which is not greater than 3.