User Equipment Sidelink Timing Calculation for 5G V2X
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G V2X communication, there is a challenge in calculating timing-related information such as direct frame numbers, subframe numbers, and slot numbers, especially when using a GNSS as a synchronization reference source, which affects synchronization and correct transmission/reception on sidelink interfaces.
Innovation Solution
A method involving user equipment that acquires time-domain configuration and indication information to determine timing-related parameters like hyper direct frame numbers, direct frame numbers, and direct slot numbers using formulas that incorporate a reference time, target time, and timing offset, ensuring synchronization across all user equipment and base stations operating on the sidelink.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GNSS-based synchronization is used in out-of-coverage scenarios, then synchronization coverage is improved, but timing calculation complexity increases
Solution Approach 1:
The patent pre-configures multiple synchronization sources including GNSS, gNB/eNB, and other UEs before actual synchronization is needed. This preliminary setup allows the system to quickly select an appropriate synchronization source without complex real-time calculations, thereby maintaining synchronization reliability while reducing computational complexity during operation.
Solution Approach 2:
The patent introduces an intermediary mechanism where other UEs can act as synchronization sources when GNSS is unavailable or gNB/eNB coverage is not present. This intermediary approach provides a fallback path that maintains synchronization reliability without requiring complex direct timing calculations between distant UEs, thus managing the complexity-reliability tradeoff.
2Adaptability or versatility
If multiple synchronization sources are supported, then synchronization adaptability is improved, but system complexity increases
Solution Approach 1:
The patent segments the synchronization system into distinct priority levels (P0-P6) with clearly defined roles for each synchronization source type. GNSS-based synchronization occupies the highest priority level, followed by gNB/eNB-based synchronization, and then other UE-based synchronization. This segmentation allows the system to support multiple synchronization sources adaptably while managing complexity through structured hierarchy and clear selection rules.
Data Source
AI summary
A method performed by user equipment, including: step A of acquiring time-domain configuration information and/or time-domain indication information; and step B of determining timing-related information according to the time-domain configuration information and/or the time-domain indication information and/or other information.