5G PDU Session Data Usage Updates Across Shared S-NSSAI and DNN
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently updating data usage values in situations with multiple PDU sessions corresponding to S-NSSAI and DNN, especially when there are multiple SMFs and PCFs involved, which can lead to inconsistencies and inefficiencies in managing remaining allowed usage.
Innovation Solution
A method and device for updating data usage by coordinating the first SMF to receive an SM context creation request, transmit a policy creation request to a first PCF, and receive a response message, involving a series of interactions among AMF, SMFs, PCFs, and UDR to ensure accurate and efficient data usage updates across multiple sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple SMFs and PCFs are involved in managing data usage across multiple PDU sessions, then the system can support more sessions and services, but inconsistencies and inefficiencies arise in updating remaining allowed usage values
Solution Approach 1:
The patent combines multiple PDU sessions that share the same S-NSSAI and DNN into a single data usage update operation. When the PCF receives a data usage update request, it identifies all PDU sessions with matching S-NSSAI and DNN parameters and updates their remaining allowed usage values simultaneously through a single Npcf_SMPolicyUpdate request to the SMF, ensuring consistency across all sessions.
Solution Approach 2:
The patent implements a feedback mechanism where the SMF sends data usage information reports to the PCF, and the PCF responds with policy update requests. This closed-loop feedback ensures that the remaining allowed usage values are consistently updated across multiple PDU sessions based on actual data consumption, maintaining reliability in the data usage management system.
2Measurement precision
If data usage updates are performed individually for each PDU session, then each session can be managed precisely, but the updating process becomes inefficient and time-consuming
Solution Approach 1:
The patent merges multiple individual data usage update operations into a single batch operation. The PCF identifies PDU sessions with the same S-NSSAI and DNN and sends one consolidated Npcf_SMPolicyUpdate request containing updates for all matching sessions, thereby maintaining precise tracking while significantly improving update efficiency.
Solution Approach 2:
The patent performs preliminary identification and grouping of PDU sessions by S-NSSAI and DNN parameters before executing the actual data usage updates. This preliminary action allows the system to prepare batch update operations, reducing the total number of individual update transactions needed and improving overall processing efficiency.
3Adaptability or versatility
If separate PCFs manage different PDU sessions, then service specialization is improved, but coordination overhead increases and derivation of remaining allowed usage becomes inefficient
Solution Approach 1:
The patent enables the PCF to perform multiple functions: it manages policy control for individual PDU sessions while simultaneously coordinating data usage updates across multiple sessions sharing the same S-NSSAI and DNN. This multi-functionality reduces the need for separate coordination mechanisms while maintaining service specialization.
Solution Approach 2:
The patent uses the S-NSSAI and DNN parameters as intermediary keys to identify and group PDU sessions that require coordinated data usage updates. This intermediary approach simplifies the coordination process by providing a clear criterion for determining which sessions should be updated together, reducing complexity in multi-PCF scenarios.
Data Source
AI summary
The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. The present invention suggests a method for requesting data usage updates from SMF/PCFs in charge of S-NSSAI/DNN when an access and mobility management function (AMF) receives a session creation request for same S-NSSAI/DNN, a method for requesting data usage updates from PCFs in charge of S-NSSAI/DNN when a unified data repository (UDR) receives a query request for same S-NSSAI/DNN, and a method for selecting same PCF for S-NSSAI and DNN.