Extended DRX Paging Reliability via Tracking Area Updates
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Solution Overview
Problem
In wireless devices, the extended discontinuous reception (eDRX) cycle can result in a longer idle period, increasing the risk of missing paging messages due to the lack of specified ordering between cell measurement and paging message monitoring, especially when the device camps on a new tracking area not indicated in the tracking area identifier list.
Innovation Solution
The extended DRX mechanism introduces an ordering of cell reselection and monitoring for potential pages, allotting sufficient time for tracking area updates and ensuring the wireless network is aware of the device's new location before entering an extended idle interval, thereby minimizing the occurrence of missed paging occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the wireless device uses extended DRX cycle with longer idle period, then energy consumption is reduced, but the risk of missing paging messages increases
Solution Approach 1:
The patent performs cell measurement and tracking area update procedures before the paging occasion occurs during the extended DRX cycle. By completing these preliminary actions in advance, the device ensures it is properly registered and measured before needing to receive paging messages, thus maintaining reliability while using extended idle periods for energy saving.
Solution Approach 2:
The extended DRX cycle is segmented into distinct phases: an active phase for performing cell measurements and tracking area updates, followed by an extended idle phase for energy saving. This segmentation allows the device to concentrate communication activities in brief windows while enjoying long idle periods, resolving the contradiction between energy efficiency and message reception reliability.
2Measurement precision
If the wireless device performs cell reselection procedure during extended idle period, then location accuracy is improved, but the time available for monitoring paging messages is reduced
Solution Approach 1:
The device performs cell reselection and tracking area update procedures as preliminary actions before the paging occasion. By completing location updates in advance, the device ensures accurate location information is available when paging messages are transmitted, without compromising the timing of paging message monitoring.
Solution Approach 2:
The patent dynamically adjusts the timing and duration of cell measurement and paging monitoring activities based on the extended DRX cycle parameters. The device flexibly allocates time resources within each DRX cycle to accommodate both location updates and paging monitoring, optimizing the balance between location accuracy and paging reliability.
Data Source
AI summary
A method, a device, and a non-transitory storage medium having instructions to obtain extended discontinuous reception (DRX) parameters from a wireless network; store the extended DRX parameters; camp on a cell of the wireless network; wake up from an idle state based on the extended DRX parameters, wherein the device wakes up at a time, prior to a paging occasion, wherein a time period from the time to the paging occasion has a duration during which the device can perform a cell reselection procedure, and subsequently, a tracking area update; measure a metric of the cell in response to a wake up; and monitor a scheduled paging occasion, wherein the scheduled paging occasion is a paging occasion that is first to occur subsequent to the wake up.