SMF Frame Preemption Distribution for Time-Sensitive Wireless
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Solution Overview
Problem
Current wireless communication systems lack an efficient method to provide frame preemption information for time-sensitive services, which is essential for ensuring reliable and accurate time-sensitive communication.
Innovation Solution
The proposed solution involves an apparatus and method for providing frame preemption information in a wireless communication system. This is achieved by an operation method of a session management function (SMF) that receives frame preemption information from a time-sensitive networking application function (TSN AF) or a time-sensitive communication and time synchronization function (TSCTSF) and retransmits it to a user plane function (UPF)/network-side TSN translator (NW-TT) or user equipment (UE)/device-side TSN translator (DS-TT) through specific interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frame preemption information is provided through multiple interfaces (SBI, N4, Ni NAS) involving SMF, PCF, UPF/NW-TT, and UE/DS-TT, then the reliability and accuracy of time-sensitive communication is improved, but the device complexity and system complexity increase
Solution Approach 1:
The system segments the frame preemption information distribution into multiple functional components: TSN AF/TSCTSF generates the information, PCF processes it, SMF distributes it through multiple interfaces (SBI to UPF/NW-TT, Ni NAS to UE/DS-TT), and UPF/NW-TT and UE/DS-TT execute it. This segmentation allows each component to specialize in specific tasks while maintaining overall system reliability through distributed intelligence.
Solution Approach 2:
The SMF acts as an intermediary that receives frame preemption information from TSN AF/TSCTSF via PCF and distributes it to multiple endpoints (UPF/NW-TT and UE/DS-TT) through different interfaces. This intermediary role enables centralized coordination while maintaining distributed execution, balancing system complexity with reliability.
2Measurement precision
If frame preemption information is distributed to multiple network elements (UPF/NW-TT and UE/DS-TT) through multiple interfaces, then the accuracy of time-sensitive communication is improved, but the loss of time in information transmission increases
Solution Approach 1:
The TSN AF or TSCTSF generates and provides frame preemption information in advance to the SMF through the PCF. This preliminary action allows the network to prepare time-sensitive communication parameters before actual data transmission occurs, enabling accurate timing control while minimizing real-time processing delays.
Solution Approach 2:
The SMF continuously maintains the frame preemption information through multiple interfaces (SBI for UPF/NW-TT, Ni NAS for UE/DS-TT), ensuring that time-sensitive communication parameters are always available at all network elements. This continuous availability eliminates information transmission delays during active communication without sacrificing accuracy.
Data Source
AI summary
Proposed is an operation method of a session management function (SMF) for providing a time-sensitive service in a wireless communication system. The operation method includes receiving frame preemption information from a time-sensitive networking application function (TSN AF) or a time-sensitive communication and time synchronization function (TSCTSF) via a policy control function (PCF) through an SBI interface, retransmitting the frame preemption information from the PCF to a user plane function (UPF)/network-side TSN translator (NW-TT) through an N4 interface, transmitting the frame preemption information from the PCF to a user equipment (UE)/device-side TSN translator (DS-TT) through an Ni NAS interface, and receiving the frame preemption information set from the UPF/NW-TT through the N4 interface and from the UE/DS-TT through the Ni NAS interface and transmitting the frame preemption information to the TSN AF or the TSCTSF via the PCF through the SBI interface.