Slave UE Thermal Management for C-V2X Platoon Timing
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Solution Overview
Problem
Current communication systems face challenges in maintaining accurate timing for cellular vehicle to anything (C-V2X) communications, particularly in platoon scenarios, due to thermal conditions that can lead to GNSS subsystem power consumption and potential disconnection from synchronization sources.
Innovation Solution
A method where a slave UE within a platoon determines its thermal condition and synchronizes directly or indirectly with a first synchronization source through a master UE, allowing for reduced GNSS usage and extended C-V2X operation duration by managing thermal levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the slave UE continuously synchronizes directly with the GNSS subsystem, then timing accuracy is maintained, but thermal footprint and power consumption increase
Solution Approach 1:
The master UE acts as an intermediary synchronization source for slave UEs. Instead of each slave UE directly synchronizing with GNSS, they receive timing information from the master UE which has already synchronized with GNSS. This intermediary approach maintains timing accuracy while reducing thermal footprint and power consumption at slave UEs.
Solution Approach 2:
The master UE copies timing information from GNSS and redistributes it to slave UEs. Rather than each device independently accessing GNSS, the master UE creates a local copy of the synchronization signal and shares it with platoon members, reducing the need for multiple direct GNSS connections.
2Reliability
If the slave UE uses GNSS subsystem for synchronization, then timing synchronization is achieved, but power consumption increases
Solution Approach 1:
The master UE serves as an intermediary that handles GNSS synchronization centrally. Slave UEs receive timing information from the master UE instead of independently accessing GNSS, significantly reducing power consumption while maintaining reliable synchronization across the platoon.
Solution Approach 2:
The master UE performs multiple functions: it synchronizes with GNSS, processes timing information, and distributes synchronization signals to multiple slave UEs. This multi-functional approach consolidates power-intensive operations into a single device.
3Temperature
If thermal levels are reduced by limiting GNSS usage, then thermal footprint decreases, but potential disconnection from synchronization sources may occur
Solution Approach 1:
The master UE acts as a persistent intermediary maintaining the connection to GNSS on behalf of all slave UEs. Even when slave UEs reduce or stop direct GNSS usage, the master UE maintains the synchronization link, ensuring continuous timing reference availability and preventing disconnection issues.
Solution Approach 2:
The system prepares for potential GNSS connection issues by establishing the master UE as a backup synchronization source. This beforehand arrangement ensures that if slave UEs cannot access GNSS directly, they still have a reliable timing reference through the master UE, cushioning against synchronization failures.
Data Source
AI summary
Method and apparatus for maintaining C-V2X timing (e.g., in platoon scenarios). The apparatus of a slave UE determines a thermal condition of the respective slave UE within a platoon of UEs. The apparatus performs synchronization with a first synchronization source, directly or indirectly, based on the thermal condition of the slave UE. Synchronization is performed directly with the first synchronization source in response to a determination that the thermal condition of the slave UE is below a threshold. Synchronization is performed indirectly with the first synchronization source through a master UE within the platoon of UEs in response to a determination that the thermal condition exceeds a threshold. The apparatus may receive, from a master UE within the platoon of UEs, SLSS to synchronize indirectly to the first synchronization source through the master UE.