UE Power Saving Mode Coordination with Service Capability Server
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Solution Overview
Problem
The Power Saving Mode (PSM) feature in 3GPP networks lacks control and coordination between user equipment (UE) and Service Capability Servers (SCS), leading to inefficiencies in energy savings, network resource management, and communication reliability for low-power devices.
Innovation Solution
A system and method for controlling and coordinating UE power savings mode characteristics, involving a computer-implemented process that includes receiving requests from UEs, sending device availability notifications to core networks or SCS, and managing power mode settings to align UE reachability with machine-type communication periodicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE enters Power Saving Mode to reduce energy consumption, then energy efficiency is improved, but the SCS loses control and awareness of UE availability
Solution Approach 1:
The patent implements a feedback mechanism where the UE sends presence indication messages to the SCS when transitioning into and out of Power Saving Mode. This allows the SCS to maintain awareness of UE availability status without requiring continuous monitoring, thus resolving the contradiction between energy saving and information availability.
Solution Approach 2:
The UE proactively notifies the SCS of its intended Power Saving Mode entry before actually entering the mode, and notifies upon exit. This preliminary action allows the SCS to plan and schedule communications accordingly, avoiding wasted transmission attempts during periods when the UE is unavailable.
2Use of energy by moving object
If the UE autonomously requests PSM mode for predetermined time, then energy saving is improved, but the SCS cannot control or coordinate the PSM state
Solution Approach 1:
The patent introduces dynamic interaction between UE and SCS regarding PSM state management. The SCS can send requests to influence UE PSM behavior, and the UE can adjust its PSM timing based on SCS communications needs. This dynamic coordination allows both energy saving and SCS control requirements to be met simultaneously.
3Use of energy by moving object
If the UE stops listening for paging in PSM mode, then energy consumption is reduced, but communication reliability deteriorates due to missed pages
Solution Approach 1:
The presence indication message mechanism provides feedback to the SCS about UE availability status. This allows the SCS to reliably determine when the UE is available for communication without requiring the UE to continuously monitor paging channels, thus maintaining communication reliability while enabling energy savings during PSM periods.
4Productivity
If the SCS initiates MT communication without knowing UE PSM state, then network resource usage increases due to retransmissions, but coordination overhead is avoided
Solution Approach 1:
The UE sends presence indication messages in advance to inform the SCS of its PSM state transitions. This preliminary information allows the SCS to plan communication attempts only during periods when the UE is known to be available, eliminating wasteful retransmissions during PSM periods without requiring complex real-time coordination protocols.
Data Source
AI summary
The present application is directed to one or more aspects with at least one aspect describing a method including a step of receiving device context information including a Power Saving Mode (PSM) Sync Flag from a core network node, where the PSM Sync Flag indicates a monitoring type of a device from among plural devices in the network. The method also includes a step of receiving a tracking area update or an attach request from the device on the network. The method further includes a step of sending a device availability notification request to a core network interworking function.