Wireless Device Timing Tracking for Long DRX Cycles

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Solution Overview

Problem

Devices operating in long discontinuous reception (DRX) or sleep cycles in wireless communication systems often lose network timing information, leading to misalignment and inefficiencies due to prolonged inactivity.

Innovation Solution

Implementing a method and apparatus that determine periodicity for monitoring windows and perform time tracking adjustments between these windows, allowing for 'cheap wakeups' that reacquire network timing without full message monitoring, thereby reducing power consumption and maintaining accurate timing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If devices operate in long DRX/SCI cycles to reduce power consumption, then power efficiency is improved, but network timing information is lost

Engineering Contradiction:
Improvepower consumptionVSAvoidnetwork timing information
Core Design Contradiction:
Use of energy by moving objectVSLoss of information

Solution Approach 1:

The device performs a time tracking adjustment by reacquiring network timing information before the long DRX/SCI cycle begins or at its start, preparing the timing state in advance. This preliminary timing synchronization allows the device to enter the long sleep cycle with accurate timing, avoiding the need to maintain continuous monitoring throughout the entire cycle.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The device implements periodic monitoring at specific intervals (at the start of each long DRX/SCI cycle or at configured monitoring occasions) rather than continuous monitoring. This periodic approach maintains timing accuracy when needed while allowing the device to remain in low-power state for the majority of the cycle, resolving the contradiction between power savings and timing information maintenance.

Inventive Principle:
Principle #19Periodic action

2Measurement precision

If devices perform full message monitoring continuously to maintain accurate timing, then timing accuracy is improved, but power consumption increases

Engineering Contradiction:
Improvetiming accuracyVSAvoidpower consumption
Core Design Contradiction:
Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The device extracts only the essential timing information from the network signals during monitoring events, rather than performing full message processing and monitoring. By taking out only the necessary timing synchronization data and discarding other message contents, the device maintains timing accuracy with significantly reduced processing overhead and power consumption compared to continuous full message monitoring.

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The device performs partial monitoring by focusing only on timing-critical signal elements (such as synchronization signals or timing reference signals) rather than monitoring all messages in full. This partial action approach provides sufficient timing accuracy for the device's needs while consuming far less power than complete continuous monitoring would require.

Inventive Principle:
Principle #16Partial or excessive action

Data Source

PatentUS9398633B2Methods and apparatus for low power tracking of network system timing for long paging cycles
Publication Date: 2016.07.19 QUALCOMM INC
  • US9398633B2 patent drawing
  • US9398633B2 patent drawing
  • US9398633B2 patent drawing

AI summary

Methods and apparatus for of tracking network system timing are provided. In one aspect, a method of tracking network system timing comprises determining a periodicity of a plurality of windows for monitoring mobile messages. The method further includes performing a time tracking adjustment between the windows. The method further includes monitoring for mobile messages exclusively within each of the windows.