eDRx Timeline Searching with Early Synchronization Signal Detection
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Solution Overview
Problem
IoT devices using extended discontinuous reception (eDRx) face power consumption issues due to clock drift during low-power sleep modes, leading to longer and more intensive searches for network re-synchronization.
Innovation Solution
A UE is configured to switch from eDRx sleep mode to active mode prior to target signals like synchronization signals or PBCH, and operate in low power mode after detection, minimizing search timelines and consumption by targeting these signals instead of paging occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If IoT devices operate in low-power sleep mode using eDRx, then power consumption is reduced, but clock drift occurs leading to longer search timelines for network re-synchronization
Solution Approach 1:
The device performs preliminary actions by detecting synchronization signals and PBCH during the sample capture window before the actual paging occasion. This early detection allows the device to prepare for re-synchronization in advance, reducing the time needed when actually returning to active mode after sleep period.
Solution Approach 2:
The device dynamically adjusts its operation by switching between eDRx sleep mode and eDRx active mode based on detection results. If synchronization signals or PBCH are detected during the sample capture window, the device can transition to low power mode earlier; if not detected, it remains in active mode to continue searching, optimizing both power consumption and search time adaptively.
2Reliability
If the device performs extensive searching for network re-synchronization after clock drift, then network connection is restored, but power consumption increases
Solution Approach 1:
The device performs preliminary detection of synchronization signals and PBCH during the sample capture window before the paging occasion. This early detection allows the device to assess whether re-synchronization is needed and prepare accordingly, reducing the need for extensive searching after returning from sleep mode.
Solution Approach 2:
The device autonomously determines whether to enter low power mode or continue searching based on its own detection results during the sample capture window. This self-service approach allows the device to make intelligent decisions about power consumption versus re-synchronization needs without requiring extensive external coordination.
3Reliability
If the device remains in eDRx active mode to ensure network synchronization, then re-synchronization reliability is improved, but power consumption increases
Solution Approach 1:
The device dynamically switches between eDRx sleep mode and eDRx active mode based on real-time detection of synchronization signals and PBCH during the sample capture window. This dynamic adaptation allows the device to optimize the balance between synchronization reliability and power consumption by being active only when necessary.
Solution Approach 2:
The device autonomously decides whether to transition to low power mode or remain in active mode based on its own detection capabilities during the sample capture window. This self-service mechanism enables the device to maintain adequate synchronization while minimizing power consumption by making intelligent, context-aware decisions.
Data Source
AI summary
Apparatus and methods for eDRx timeline searching are described. An apparatus is configured to switch, at a start of a sample capture window that is prior to a target wakeup time, from an eDRx sleep mode of operation to an eDRx active mode of operation. The target wakeup time is associated with at least one of a synchronization signal or a PBCH of a network node. The apparatus is configured to operate in a low power mode, subsequent to the target wakeup time and prior to a PO, based on a detection of at least one of the synchronization signal or the PBCH.