Always-On PDU Session Management for Low-Latency Resource Control
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Solution Overview
Problem
In 5G mobile communications, concurrent session request procedures are not allowed, leading to delayed initiation of latency-sensitive services, which affects key performance indicators, and the always-on PDU session approach risks malicious consumption of network resources.
Innovation Solution
A session management method where a session management network element determines and establishes an always-on session based on subscription, policy, and local configuration information, managing user-plane resources to avoid unnecessary consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If concurrent SR procedures are not allowed in 3GPP standard, then session management is simplified, but latency-sensitive services are severely affected
Solution Approach 1:
The patent applies preliminary action by pre-establishing always-on PDU sessions for latency-sensitive services before actual data transmission is needed. This allows user plane resources to be pre-configured and activated, enabling immediate data transmission when services like uRLLC, MPS, or MCS require urgent connectivity without waiting for SR procedure completion.
Solution Approach 2:
The patent implements dynamics by allowing the network to dynamically adjust session states between inactive and active based on service requirements. The session management network element can activate user plane resources for always-on sessions when needed and deactivate them when not in use, providing flexible resource allocation that balances latency requirements with resource efficiency.
2Loss of time
If always-on PDU session is used for latency-sensitive services, then service latency is reduced, but network resources may be maliciously consumed
Solution Approach 1:
The patent applies feedback by implementing network-side control mechanisms that monitor and manage always-on session states. The session management network element receives feedback about session usage patterns and actively manages resource activation/deactivation based on actual service needs, preventing unauthorized or malicious resource consumption while maintaining low-latency capability for legitimate services.
Solution Approach 2:
The patent uses parameter changes by dynamically modifying session parameters such as user plane resource activation state, QoS parameters, and session validity periods. The network can adjust these parameters based on service requirements, terminal behavior patterns, and resource availability, allowing always-on sessions to provide low latency when needed while consuming minimal resources during idle periods.
Data Source
AI summary
A session management method performed by a session management network element includes receiving a first request message, where the first request message is used to request to establish a first session for a terminal, determining to establish the first session as an always-on session, where the always-on session is a session for which user-plane resources are activated when the terminal is transitioned from an idle mode to a connected mode, and sending a first response message to the terminal, where the first response message is used to indicate that the session management network element accepts to establish the first session, the first response message comprises first indication information, and the first indication information is used to indicate that the first session is an always-on session.