DRX Start Offset Segmentation for LTE Cycle Timing

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Solution Overview

Problem

The existing LTE system's DRX operation is flawed due to the incompatibility between the long and short DRX cycles' start offsets, making it impossible to start the On Duration Timer for the short DRX cycle when the long DRX cycle Start Offset is used, as no subframe can satisfy the equation (SFN * 10 + subframe number) modulo (short DRX cycle) = long DRX Start Offset.

Innovation Solution

The method involves separately managing the start offset operations for the long and short DRX cycles by using distinct start offset parameters, allowing the UE to determine matching SFN and subframe numbers for each cycle, and starting the On Duration Timer accordingly, with the short DRX Start Offset derived from the DRX Start Offset parameter using modulus operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the long DRX cycle Start Offset is used to configure the short DRX cycle, then the DRX configuration is simplified, but the short DRX cycle cannot be properly started due to incompatibility

Engineering Contradiction:

ImproveDRX configuration complexityVSAvoidDRX operation reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent segments the DRX Start Offset configuration by introducing separate offset parameters for long and short DRX cycles. The long DRX cycle uses 'drx-StartOffset' while the short DRX cycle uses 'shortDRX-CycleStartOffset'. This segmentation resolves the incompatibility issue where a single offset cannot properly serve both cycle lengths, allowing each DRX cycle type to have its own optimized offset configuration.

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If a single DRX Start Offset parameter is used for both long and short DRX cycles, then the configuration is simpler, but no subframe can satisfy the timing equation for short DRX cycle

Engineering Contradiction:

ImproveDRX configuration easeVSAvoidDRX cycle adaptability

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The patent applies local quality by providing different offset parameters tailored to specific DRX cycle types. Instead of a universal offset that must work for all cycles, the system uses 'drx-StartOffset' specifically for long cycles and 'shortDRX-CycleStartOffset' specifically for short cycles. This allows each parameter to be locally optimized for its intended DRX cycle type, ensuring proper timing alignment for both long and short cycles independently.

Inventive Principle:

Principle #3Local quality

3Use of energy by moving object

If the long DRX cycle is configured to be longer than the short DRX cycle, then power saving is improved, but the Start Offset becomes incompatible with the short DRX cycle

Engineering Contradiction:

ImproveUE power consumptionVSAvoidDRX offset management complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent segments the offset management system into two independent configurations: one for long DRX cycles and one for short DRX cycles. This allows the network to configure appropriate offset values for each cycle type independently, ensuring that the longer long DRX cycle provides power saving benefits while the short DRX cycle can still be properly initiated with its own compatible offset parameter.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP2182769B1Method of managing discontinuous reception offset in a wireless communications system and related communication device

Publication Date: 2017.05.10 HTC CORP

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AI summary

A method of managing an offset operation of discontinuous reception, hereinafter called DRX, for a mobile device of a wireless communication system includes separately managing a start offset operation of a long DRX cycle and a start offset operation of a short DRX cycle.