SMF-Managed 5G QoS Flows for PTP Time Synchronization
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Solution Overview
Problem
The existing QoS flows in 5G networks do not adequately support the time synchronization protocol for Time Sensitive Communication (TSC), leading to unsatisfactory synchronization quality due to inadequate QoS levels, which can result in delays and deviations that compromise the performance of time synchronization protocols.
Innovation Solution
A method is introduced to create a QoS flow for time synchronization protocols by receiving PTP profile information from UEs, setting PCCrules, and providing QoS flow and filter information to UPFs and AMFs, ensuring that the QoS requirements for time synchronization are met through the use of Session Management Function (SMF) and other network entities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional QoS flow generation is used in 5G, then the system maintains simplicity and compatibility, but the time synchronization quality cannot be guaranteed due to inadequate QoS levels
Solution Approach 1:
The patent applies preliminary action by pre-configuring PCC rules and QoS flow templates specifically designed for time synchronization protocols before actual data transmission. The SMF pre-establishes appropriate QoS parameters (delay budget, packet error rate, priority) based on the protocol type, so that when time-sensitive data arrives, the QoS flow is already optimized and ready, eliminating the need for complex real-time QoS adjustments while guaranteeing synchronization quality
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting QoS flow parameters based on protocol requirements. Different time synchronization protocols (NTP, PTP, TSN) have different delay budgets, packet error rates, and priority levels. The system modifies these parameters according to the specific protocol being used, transforming a generic QoS mechanism into a protocol-optimized solution that maintains reliability without requiring complete system redesign
2Reliability
If QoS flow is created without reflecting time synchronization characteristics, then the system maintains ease of operation, but delay and deviation occur compromising synchronization performance
Solution Approach 1:
The patent applies self-service by enabling the system to automatically select and configure appropriate QoS parameters based on the time synchronization protocol type. The SMF automatically identifies the protocol (NTP, PTP, TSN) and applies the corresponding pre-defined QoS template without requiring manual configuration. This automation maintains ease of operation while ensuring that each protocol receives the specific QoS treatment it needs for optimal performance
Solution Approach 2:
The patent implements feedback mechanisms where the system monitors actual transmission delays and synchronization performance, then uses this information to refine QoS parameter selection. The SMF receives feedback about protocol performance and adjusts QoS flow parameters accordingly, creating a closed-loop system that continuously optimizes synchronization quality while maintaining operational simplicity through automated adjustment
3Reliability
If delay in time synchronization protocol delivery exceeds threshold, then the system maintains basic functionality, but the time synchronization protocol operation cannot be guaranteed
Solution Approach 1:
The patent applies preliminary anti-action by proactively establishing QoS flows with guaranteed delay budgets before time synchronization traffic arrives. The SMF pre-configures appropriate delay budgets based on protocol requirements (e.g., PTP requires stricter delays than NTP), and sets up packet prioritization and resource reservation in advance. This prevents delay accumulation by addressing potential timing issues before they occur, ensuring protocol operation guarantees are maintained
Solution Approach 2:
The patent implements dynamics by making QoS flow parameters adaptive to different time synchronization protocols and network conditions. The system dynamically adjusts delay budgets, priority levels, and resource allocation based on the specific protocol being used and current network state. This dynamic approach allows the system to maintain reliable synchronization across varying conditions without requiring static, overly conservative parameters that would increase delay
Data Source
AI summary
Provided is a method of creating a QoS flow for a time synchronization protocol in a wireless communication network. A method of creating a QoS flow for a time synchronization protocol in a wireless communication network includes: receiving, by a Session Management Function (SMF), the PTP profile information from the UE, together with at least one of a DNN, a S-NSSAI information and a session ID for a Time Sensitive Communication (TSC) service; setting, by the SMF, a PCCrule of the QoS flow for the time synchronization protocol; providing, by the SMF, the QoS flow and a SDF filter information for the QoS flow to a User Plane Function (UPF); and providing, by the SMF, the QoS flow and a QoS rule filter to an Access and Mobility Management Function (AMF).