SMF-UPF Usage Recovery Without Retransmission Congestion
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in recovering lost usage amount information between devices, leading to network congestion and delayed data transmission due to retransmission limitations and undefined recovery operations for message loss.
Innovation Solution
A method is implemented where a Session Management Function (SMF) transmits and receives messages to a User Plane Function (UPF) to determine lost usage amounts, using cumulative usage information and difference values to recover and transmit accurate data without adding new messages, thereby minimizing network congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retransmission is used to compensate for lost messages between control plane and user plane, then message loss is addressed, but network congestion increases and data transmission is delayed
Solution Approach 1:
The patent applies preliminary action by having the user plane function proactively report cumulative usage amount information to the control plane function before messages are lost. This allows the control plane to maintain an updated record of usage amounts without needing to rely on potentially lost retransmission messages, thus preventing delays while ensuring reliability
Solution Approach 2:
The patent implements feedback mechanisms where the user plane function continuously reports usage amount information back to the control plane function. This feedback loop ensures that the control plane has accurate, up-to-date usage information without needing to retransmit lost messages, resolving the contradiction between reliability and transmission delay
2Loss of information
If retransmission operations are performed to recover lost usage amount information, then information completeness is improved, but network congestion worsens
Solution Approach 1:
The patent extracts the cumulative usage amount information from the user plane function and reports it separately to the control plane function. This extraction allows the control plane to recover lost usage information without needing to retransmit entire messages, reducing network traffic while ensuring information completeness
Solution Approach 2:
The patent uses cumulative usage amount reporting as an intermediary mechanism between the user plane and control plane. Instead of directly retransmitting lost usage amount information, the system uses cumulative reports as a mediator to convey the necessary data, reducing network congestion while maintaining information completeness
3Reliability
If standard retransmission and time-out recognition methods are used, then message loss compensation is achieved, but system complexity increases due to undefined recovery operations
Solution Approach 1:
The patent changes the parameter of information reporting from periodic or event-triggered messages to continuous cumulative usage amount reporting. This parameter change simplifies the recovery operations by providing a straightforward mechanism to track and recover usage information, reducing system complexity while maintaining reliability
Data Source
AI summary
An operation method of a session management function (SMF) is provided. The method includes the steps of transmitting a request message to a user plane function (UPF) on the basis of the UPF and a session configuration, receiving a response message from the UPF, determining whether there is a lost usage amount on the basis of the response message, and, when there is a lost usage amount, transmitting recovered usage amount information to an online charging system (OCS), wherein the response message may include current usage amount information and cumulative usage amount information of the UPF.