Dynamic PSM and eDRX Configuration for IoT Reachability
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Solution Overview
Problem
Conventional systems cannot use Power Saving Mode (PSM) and enhanced Discontinuous Reception (eDRX) simultaneously with an active timer of 0, as the network discards configured eDRX parameters, rendering the device unreachable during idle states and preventing paging occasions.
Innovation Solution
A method where a user equipment dynamically adjusts PSM cycles by setting PSM to off when eDRX is on, performing an attachment procedure or tracking area update, and then setting PSM to on when the eDRX duration expires or a paging time window is received, allowing for long eDRX and PSM periods without waiting for mandatory Tact durations, using attention commands to configure eDRX and PSM timers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the UE sets PSM to on with Active Timer=0, then power saving is improved, but the network discards eDRX parameters and the UE becomes unreachable during idle state
Solution Approach 1:
The patent applies dynamics by making the PSM state changeable through AT commands. The UE can dynamically transition between PSM on and PSM off states based on network conditions and power saving requirements. This allows the system to adapt the PSM configuration dynamically rather than being locked in a fixed state, resolving the contradiction between power saving and reachability.
Solution Approach 2:
The patent changes the parameter of PSM configuration from a fixed network-controlled state to a UE-controllable state through AT commands. By allowing the UE to modify its PSM status and eDRX parameters independently, the system can optimize both power saving performance and reachability according to actual operational needs.
2Loss of energy
If the UE uses long eDRX periods, then power saving is improved, but the mandatory Tact duration requirement limits the effectiveness
Solution Approach 1:
The patent applies preliminary action by having the UE perform attachment procedures or tracking area updates before entering PSM mode with long eDRX periods. This ensures that the network properly configures the UE with the desired eDRX parameters before the UE goes into power saving mode, eliminating the need to wait for mandatory Tact durations and allowing immediate effectiveness of long eDRX settings.
Solution Approach 2:
The patent uses AT commands as an intermediary mechanism between the UE and the network. These commands allow the UE to configure its own PSM and eDRX parameters directly, serving as a mediator that bypasses the need for network-initiated configuration cycles and mandatory waiting periods.
3Loss of energy
If the network configures eDRX with Active Timer=0, then power saving is improved, but the UE blocks any paging occasion and is considered unreachable
Solution Approach 1:
The patent makes the PSM state dynamic and controllable through AT commands. The UE can transition between PSM on and PSM off states based on operational requirements. When paging is needed, the UE can switch to PSM off state to maintain reachability, and when power saving is the priority, it can switch to PSM on state with long eDRX periods, thus dynamically balancing power saving and paging capabilities.
Data Source
AI summary
A method, system, computer readable storage medium, or apparatus provides for or both the use of long extended discontinuous reception (eDRX) and long power saving mode (PSM) without having to wait for the activity timer expiration.