SGW NTSR Control via Terminal Power Saving State
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Solution Overview
Problem
Current network triggered service restoration (NTSR) procedures in wireless communication networks face inefficiencies, including unnecessary resource waste, unclear session duration, and lack of UE-level control, particularly for devices using power saving features, leading to ineffective restoration and resource inefficiencies.
Innovation Solution
Implementing methods at the Serving Gateway (SGW), Mobility Management Entity (MME), and Home Subscriber Server (HSS) to dynamically determine whether to apply NTSR based on power saving information and device state, enabling flexible control on a per-terminal-device basis, and optimizing session duration and resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NTSR is applied for all terminal devices when MME fails, then service restoration coverage is improved, but network resource waste increases due to unnecessary restoration for power-saving devices
Solution Approach 1:
The patent applies local quality by differentiating NTSR application on a per-terminal basis. The SGW examines terminal-specific power saving information (PSM and eDRX) to determine whether to apply NTSR, rather than applying it uniformly to all terminals. This allows the system to provide restoration service where needed while avoiding waste for terminals in power-saving states.
Solution Approach 2:
The patent changes the parameter of NTSR application from a binary all-or-nothing approach to a conditional approach based on terminal state parameters. By introducing power saving information (PSM/eDRX) as decision parameters, the system dynamically adjusts NTSR application based on terminal power state, activity state, and other parameters received from the MME.
2Reliability
If NTSR is triggered for terminals in power saving mode, then service restoration is achieved, but power saving effectiveness is reduced due to unnecessary wake-up
Solution Approach 1:
The patent applies local quality by making NTSR application terminal-specific rather than network-wide. The SGW evaluates individual terminal power saving states and selectively applies NTSR only to terminals that need restoration, avoiding unnecessary wake-ups for terminals in deep power-saving modes.
Solution Approach 2:
The patent enables terminals to self-manage their power state information by having them indicate their power saving mode and activity state to the network. The MME receives and forwards this terminal-generated power saving information to the SGW, allowing terminals to effectively self-regulate their restoration behavior.
3Ease of operation
If NTSR is applied without considering terminal state, then restoration procedure simplicity is maintained, but restoration effectiveness decreases for sleeping terminals
Solution Approach 1:
The patent applies preliminary action by having the MME collect and forward power saving information to the SGW before failure occurs. This pre-positioning of terminal state information allows the SGW to make informed NTSR decisions immediately upon failure detection, without needing to query terminal state afterward.
Solution Approach 2:
The patent introduces the MME as an intermediary that bridges the terminal and SGW for power saving information exchange. The MME receives power saving information from the terminal and forwards it to the SGW, enabling the SGW to make informed NTSR decisions without direct terminal interaction.
Data Source
AI summary
Methods and apparatuses are disclosed for network triggered service restoration (NTSR). According to an embodiment, a serving gateway (SGW) obtains, from a mobility management entity (MME), information capable of indicating whether to apply NTSR for a terminal device. In response to detecting a failure of the MME, the SGW determines whether to apply NTSR for the terminal device based on the obtained information.