UE Route Selection Policy for Network Slicing Optimization
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Solution Overview
Problem
Current 5G mobile communication systems face challenges in optimizing the use of User Equipment (UE) Route Selection Policy (URSP) for Network Slicing, particularly when there is only one allowed Network Slice Selection Assistance Information (NSSAI), leading to unnecessary new PDU session establishment requests and impacting user experience.
Innovation Solution
A method is introduced where the UE checks if the allowed NSSAI includes only one S-NSSAI and if existing PDU sessions have attributes matching those of a requested new PDU session. If both conditions are met, the UE selects an existing PDU session to associate with the new request, thereby avoiding the establishment of a new PDU session.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE always establishes a new PDU session when a new service request arrives, then the service can be quickly set up, but unnecessary signaling is generated and network resources are wasted
Solution Approach 1:
The UE performs preliminary checking of existing PDU sessions against the requested service requirements before initiating new session establishment. By pre-evaluating whether existing sessions can satisfy the new service request (checking S-NSSAI, DNN, and other attributes), the system avoids unnecessary new session setup signaling while still enabling quick service deployment when conditions permit.
Solution Approach 2:
The UE autonomously determines whether to reuse an existing PDU session or establish a new one by self-evaluating the compatibility between existing session attributes and the new service requirements. This self-service mechanism eliminates the need for network-side intervention in the decision process, reducing signaling overhead while maintaining appropriate service setup speed.
2Loss of energy
If the UE reuses existing PDU sessions for new service requests, then signaling is reduced and network resources are optimized, but the ability to provide dedicated network resources for specific services is compromised
Solution Approach 1:
The decision to reuse or establish new PDU sessions is made locally at the UE based on specific service requirements and existing session attributes. By evaluating each service request individually against existing sessions' S-NSSAI, DNN, and other characteristics, the system provides tailored resource allocation decisions that maintain network slicing adaptability for services requiring dedicated resources while enabling reuse for compatible services.
Solution Approach 2:
The system changes the decision parameter from a fixed 'always establish new session' or 'always reuse session' approach to a dynamic evaluation based on multiple parameters including S-NSSAI, DNN, service requirements, and existing session attributes. This parameter-driven approach enables the system to adapt to different service types and network conditions, maintaining versatility while reducing unnecessary signaling.
3Reliability
If the UE establishes multiple PDU sessions for different services, then each service gets dedicated network resources, but device complexity and session management overhead increase
Solution Approach 1:
Instead of always establishing fully dedicated PDU sessions for every service request, the system performs partial action by checking only the essential attributes (S-NSSAI, DNN, etc.) of existing sessions against new service requirements. This partial evaluation approach reduces session management complexity while still ensuring that services receiving dedicated resources maintain their quality of service through the attribute matching mechanism.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Disclosed is a method performed by a UE, the method comprising: having at least one existing PDU session associated with an S-NSSAI; requesting, from an upper layer, a new PDU session; determining a condition; performing checking operations comprising: (i) checking whether allowed NSSAI includes only one S-NSSAI, and (ii) checking whether any of the at least one existing PDU sessions have an attribute which matches a corresponding attribute in the requested new PDU session; and when both checking operations (i) and (ii) are true: selecting a PDU session from the at least one existing PDU sessions which matches at least one attribute, determining that the selected PDU session can be used or associated with the request from the upper layer, and forwarding details of the selected PDU session to the upper layer.