Terminal TSN Time Information Sharing via PC5 Interface
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Solution Overview
Problem
Current technologies for synchronizing Time Sensitive Networks (TSN) in 5G NR systems primarily assume a single grandmaster and lack detailed implementation of propagation delay compensation, especially for scenarios with multiple TSN end stations connected to User Equipment (UEs).
Innovation Solution
A terminal equipped with a control unit for processing in both TSN and NR networks, and a transmission unit that shares TSN time information between nearby TSN end stations, enabling synchronization without relying on the core network and allowing for propagation delay compensation based on timing adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TSN time information is shared through the core network (UPF), then synchronization can be achieved in a centralized manner, but the synchronization speed and efficiency deteriorate due to network latency and dependency on core network infrastructure
Solution Approach 1:
The patent extracts the TSN time information sharing function from the core network (UPF) and implements it directly at the UE level. The transmitting UE shares TSN time information with neighboring receiving UEs through direct PC5 interface communication, eliminating the need to route synchronization data through the core network infrastructure, thereby reducing latency while maintaining reliability
Solution Approach 2:
The patent introduces TSN time information as an intermediary element that is shared between UEs through direct communication. This intermediary carries the essential synchronization data (TSN time, propagation delay compensation information) that enables UEs to synchronize without relying on core network mediation, thus improving synchronization speed
2Measurement precision
If propagation delay compensation is not implemented, then the system complexity is reduced, but the synchronization precision deteriorates due to unaccounted transmission delays
Solution Approach 1:
The patent implements a feedback mechanism where the transmitting UE includes propagation delay compensation information in the shared TSN time information message. The receiving UE uses this feedback information to adjust and compensate for transmission delays, thereby improving synchronization precision without requiring complex bidirectional measurement and calculation procedures
Solution Approach 2:
The patent applies preliminary action by pre-calculating and including propagation delay compensation information in the TSN time information message before transmission. The receiving UE can directly apply this pre-computed compensation value to adjust its synchronization timing, avoiding the need for complex real-time delay measurement and calculation procedures
Data Source
AI summary
A terminal includes a control unit that performs processing related to a first network and a second network; and a transmission unit that transmits a message used in the first network and including time information of the second network, when two or more terminals, to which two or more stations belongs to the second network respectively connected, are located in a neighborhood.