Sidelink Synchronization Timing Adjustment via GNSS Offset
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Solution Overview
Problem
User equipment (UEs) in vehicle-to-everything (V2X) communication systems face synchronization challenges, particularly when out-of-coverage UEs need to establish sidelink connectivity without a common synchronization reference, leading to communication failures due to unsynchronized sidelink transmissions.
Innovation Solution
The method involves receiving a signaling from a base station indicating a timing offset between sidelink synchronization timings and a global navigation satellite system (GNSS), allowing UEs to adjust their sidelink synchronization timings and prioritize transmissions based on priority levels to avoid collisions with uplink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UEs establish sidelink connectivity without a common synchronization reference when out-of-coverage, then direct device-to-device communication can be initiated, but communication failures occur due to unsynchronized sidelink transmissions
Solution Approach 1:
The patent introduces GNSS as an intermediary synchronization reference that UEs can independently access. When out-of-coverage, UEs use GNSS timing signals as a common reference point to synchronize their sidelink transmissions, eliminating the need for network coordination while ensuring all UEs align to the same time base, thus preventing communication failures
Solution Approach 2:
The patent enables UEs to autonomously synchronize their sidelink transmissions by independently receiving and processing GNSS timing signals. Each UE self-adjusts its transmission timing based on GNSS references without requiring network assistance, allowing reliable direct communication even when out-of-coverage
2Reliability
If sidelink transmission timing is adjusted to align with GNSS, then synchronized communication is achieved, but transmission timing conflicts with uplink transmissions may occur
Solution Approach 1:
The patent segments the transmission timing space by introducing an offset parameter that divides potential transmission slots into distinct regions. By adjusting the sidelink transmission timing relative to GNSS references and applying priority-based offset selection, the system separates sidelink and uplink transmissions into different time slots, preventing collisions while maintaining GNSS synchronization
Solution Approach 2:
The patent implements dynamic timing adjustment where the offset between sidelink transmission timing and GNSS references is not fixed but can be adjusted based on detected uplink transmission patterns. The UE monitors for potential conflicts and dynamically modifies its sidelink transmission timing to avoid collisions with uplink transmissions while maintaining overall synchronization
Data Source
AI summary
Aspects of the disclosure provide a method and an apparatus for synchronization to a common synchronization reference source. For example, the apparatus can include receiving circuitry and processing circuitry. The receiving circuitry can be configured to receive from a BS a signaling indicating a timing offset between sidelink synchronization timings of the apparatus and a GNSS. The processing circuitry can be configured to adjust the sidelink synchronization timing of the apparatus based on the timing offset.