Always-On PDU Session Management for 5G Resource Control
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Solution Overview
Problem
In 5G mobile communications, concurrent session request procedures for different service types 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 network element determines and manages always-on sessions based on subscription, policy, and local configuration information to activate user-plane resources only when necessary, reducing unnecessary network resource consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If concurrent SR procedures are not allowed in 3GPP standard, then network control and management are simplified, but latency-sensitive services are severely affected due to queuing delays
Solution Approach 1:
The patent implements dynamic session management by allowing the network to selectively permit concurrent session requests based on service priority, terminal capability, and network load conditions. High-priority latency-sensitive services can initiate concurrent SR procedures while lower-priority services follow sequential processing, making the system flexible rather than rigidly sequential or always concurrent
Solution Approach 2:
The patent changes the parameter of session request processing from a fixed sequential mode to a dynamic mode where concurrency is controlled by priority parameters, terminal capability parameters, and network policy parameters. This allows the system to adapt processing behavior based on real-time conditions
2Speed
If always-on PDU session is implemented to reduce latency, then service activation speed is improved, but network resources are maliciously consumed
Solution Approach 1:
The patent implements feedback mechanisms where the network monitors terminal behavior, resource usage patterns, and session activation frequency. Based on this feedback, the network dynamically adjusts whether to permit always-on session behavior, revoke always-on status, or apply rate limiting to prevent malicious resource consumption while maintaining legitimate low-latency services
Solution Approach 2:
The patent applies different quality levels of session management to different terminals and services. Instead of universally enabling always-on sessions, the network grants always-on capability selectively based on terminal credibility, service priority, and local network conditions, creating localized quality differences in resource allocation
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.