SM PCF Network Slice Replacement Policy Management
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently supporting dynamic policies, particularly during network slice replacements, which can lead to disruptions in service and suboptimal resource allocation.
Innovation Solution
The proposed method involves a session management policy control function (SM PCF) that receives updates for alternative network slices and determines whether to retain or re-establish protocol data unit (PDU) sessions. This includes transmitting event exposure notify messages to network functions, ensuring seamless policy updates and resource management during network slice replacements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If network slice replacement is performed to support dynamic policies, then adaptability and service diversity are improved, but service disruption and reliability deteriorate
Solution Approach 1:
The system performs preliminary actions by establishing event exposure notify mechanisms before network slice replacement occurs. The SM PCF proactively sets up notification channels with network functions, and the AM PCF subscribes to slice replacement events in advance, enabling seamless policy updates without service disruption when replacement actually occurs.
Solution Approach 2:
The event exposure notify message acts as an intermediary mechanism between the SM PCF and network functions. This intermediary enables indirect communication and coordination during network slice replacement, allowing policy updates to be propagated smoothly through the network without direct disruption to user services.
2Adaptability or versatility
If network slice replacement is performed to support dynamic policies, then adaptability and service diversity are improved, but device complexity and management overhead increase
Solution Approach 1:
The event exposure notify mechanism serves multiple functions simultaneously: it notifies about network slice replacements, triggers policy updates, coordinates between different network functions, and maintains service continuity. This universal mechanism reduces the need for separate specialized procedures for each function, thereby reducing overall system complexity despite enhanced adaptability.
Solution Approach 2:
The system implements feedback loops where the AM PCF subscribes to slice replacement events and receives notifications from the SM PCF. This feedback mechanism enables automatic policy updates based on real-time network state, reducing manual management complexity while maintaining high adaptability to dynamic network conditions.
3Reliability
If PDU session retention is implemented during network slice replacement, then service continuity is improved, but resource allocation efficiency may deteriorate
Solution Approach 1:
The system dynamically determines whether to retain or re-establish PDU sessions based on real-time conditions. The SM PCF evaluates the network slice replacement context and makes adaptive decisions about session retention, allowing the system to optimize resource allocation while maintaining service continuity when appropriate. This dynamic approach prevents rigid retention policies from causing resource inefficiency.
Solution Approach 2:
The system changes key parameters such as slice identifiers and policy configurations during network slice replacement while maintaining PDU session integrity. By carefully managing parameter changes and updating only necessary elements, the system achieves service continuity without unnecessarily reallocating all resources, thereby maintaining resource allocation efficiency.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Specifically, the disclosure provides a method performed by a session management policy control function (SM PCF) entity in a wireless communication system, including receiving, from a session management function (SMF) entity, an SM policy control update request message including information for identifying a alternative network slice and information related to whether to retain a protocol data unit (PDU) session, identifying a network slice replacement based on the received SM policy control update request message, and transmitting, to at least one network function (NF) entity, an event exposure notify message including at least one of the information for identifying the alternative network slice or the information related to occurrence of the network slice replacement.