Multi-PDU Session Establishment for URSP-Limited 5G Applications
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Solution Overview
Problem
In the 5G network, terminal devices face challenges in establishing multiple PDU sessions for the same application due to reusing existing sessions based on user route selection policy (URSP), which prevents the creation of additional sessions needed for ultra-reliable low-latency communication (URLLC) services.
Innovation Solution
The method involves a network apparatus sending indication information to a terminal device to establish multiple sessions for an application, allowing the terminal device to create additional sessions by using different session parameters or network elements, even if initial sessions are rejected, ensuring multiple sessions are established.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal device reuses the established PDU session based on URSP, then session establishment efficiency is improved, but the ability to establish multiple sessions for the same application is lost
Solution Approach 1:
The patent makes the session establishment process dynamic by allowing the terminal to switch between reusing existing sessions and establishing new sessions based on real-time service requirements. The network device dynamically provides indication information that triggers the terminal to establish additional sessions beyond the default single-session behavior, enabling adaptability for URLLC services while maintaining efficiency for standard services.
Solution Approach 2:
The patent changes the session establishment parameters by introducing indication information from the network device that modifies the terminal's session selection behavior. When this indication is received, the terminal changes its parameter from reusing an existing PDU session to establishing a new PDU session with potentially different session parameters, enabling multiple sessions for the same application.
2Reliability
If the terminal device establishes multiple PDU sessions with the same selection parameters, then reliability for URLLC is improved, but the URSP mechanism prevents additional session establishment
Solution Approach 1:
The patent introduces indication information as an intermediary mechanism between the network device and terminal device. This intermediary carries service requirement information that mediates the conflict between the simplified URSP mechanism and the need for multiple sessions. The indication information acts as a trigger that enables the terminal to bypass the single-session limitation of URSP when multiple sessions are required for reliability.
Solution Approach 2:
The patent applies preliminary action by having the network device provide indication information in advance that prepares the terminal to establish multiple sessions. This preliminary indication allows the terminal to proactively establish additional PDU sessions before service failures occur, ensuring reliability for URLLC services by having redundant sessions ready.
Data Source
AI summary
A session establishment method and apparatus is provided, to resolve a problem that a terminal device cannot establish a plurality of PDU sessions for a same APP based on a URSP. The method includes: A terminal apparatus receives indication information from a first network apparatus, where the indication information is used to indicate that a first application needs to be associated with at least two sessions; and establishes at least one session for the first application based on at least the indication information, so that the first application is associated with at least two sessions.