Adapting eDRX and MDT Configurations for Wireless Device Power Management

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Solution Overview

Problem

Current Minimization of Drive Tests (MDT) and enhanced Discontinuous Reception (eDRX) technologies face challenges in completing MDT measurements within a single Paging Time Window (PTW), with eDRX cycles often exceeding the maximum MDT measurement time, leading to increased power consumption, poor measurement quality, and potential MDT failures.

Innovation Solution

Adapting the eDRX and MDT configurations to allow MDT measurements to be completed within a predetermined number of PTWs by adjusting the DRX cycle length and PTW size, ensuring accurate timestamping and efficient power management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If eDRX cycle is extended to reduce power consumption, then power saving is improved, but MDT measurement completion becomes unreliable

Engineering Contradiction:

Improvepower consumptionVSAvoidMDT measurement completion

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent applies dynamics by making the eDRX cycle length adjustable and adaptable. The network can configure different eDRX cycle lengths based on UE power saving requirements and MDT measurement requirements. The system dynamically selects appropriate eDRX parameters to balance power consumption and measurement completion reliability, rather than using a fixed cycle length.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes parameters by introducing configurable eDRX cycle lengths and PTW positions. By adjusting these parameters, the system can ensure that multiple PTWs fall within the MDT measurement period, guaranteeing measurement completion while allowing extended eDRX cycles for power saving when measurements are not required.

Inventive Principle:

Principle #35Parameter changes

2Duration of action of moving object

If eDRX cycle is extended to allow infrequent wake-ups, then battery lifetime is improved, but MDT measurement time requirement cannot be met

Engineering Contradiction:

Improvebattery lifetimeVSAvoidMDT measurement time

Core Design Contradiction:

Duration of action of moving objectVSDuration of action of stationary object

Solution Approach 1:

The patent applies preliminary action by pre-configuring multiple Paging Time Windows (PTWs) within the MDT measurement period. The network provides MDT configuration information including logging duration and logging interval, and ensures that at least two PTWs occur within this period, guaranteeing that measurements can be completed even with extended eDRX cycles.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts the relationship between eDRX cycle length and MDT measurement parameters. By configuring appropriate logging intervals and ensuring multiple PTWs within the measurement period, the system adapts to different battery lifetime requirements while maintaining measurement completion capability.

Inventive Principle:

Principle #15Dynamics

3Use of energy by moving object

If MDT measurement period is extended to accommodate eDRX cycles, then power consumption is reduced, but measurement quality deteriorates

Engineering Contradiction:

Improvepower consumptionVSAvoidmeasurement quality

Core Design Contradiction:

Use of energy by moving objectVSMeasurement precision

Solution Approach 1:

The patent changes parameters by configuring appropriate logging intervals and ensuring multiple PTWs within the MDT measurement period. This allows the system to use extended eDRX cycles for power saving while maintaining measurement quality through proper parameter adjustment, rather than extending the overall measurement period.

Inventive Principle:

Principle #35Parameter changes

4Productivity

If eDRX and MDT configurations are independently optimized, then each function performs well, but joint operation fails

Engineering Contradiction:

Improvefunction performanceVSAvoidjoint operation capability

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent merges eDRX configuration and MDT configuration into a coordinated joint configuration process. The network provides both eDRX parameters (cycle length, PTW position) and MDT parameters (logging duration, logging interval) together, ensuring they are compatible and can operate successfully together, rather than optimizing them independently.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The system dynamically coordinates eDRX and MDT configurations to achieve both individual function performance and joint operation capability. By providing comprehensive configuration information that considers both functions simultaneously, the system adapts to different scenarios and ensures successful joint operation.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10051504B2Methods and apparatuses for supporting MDT during eDRX

Publication Date: 2018.08.14 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A wireless device obtains an extended discontinuous reception (eDRX) configuration for the wireless device, obtains a minimization of drive tests (MDT) configuration for the wireless device, and adapts at least one of the eDRX configuration and the MDT configuration such that the wireless device completes an MDT measurement according to the MDT configuration within a predetermined number of paging transmission windows (PTWs) associated with the eDRX configuration. The wireless device performs the MDT measurement within the predetermined number of PTWs according to the adapted at least one of the eDRX configuration and the MDT configuration.