Dual-Receiver Mobility Measurements for Low-Power Wireless Handover

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Solution Overview

Problem

Existing wireless communication devices face high energy consumption during mobility measurements due to frequent activation of radio receivers for sample collection and baseband processing, especially in idle/inactive modes, which reduces battery life without compromising mobility robustness.

Innovation Solution

Equipping wireless communication devices with a primary and secondary receiver, where the secondary receiver consumes less power by performing time-domain correlation for mobility measurements, allowing the primary receiver to remain in a deep sleep state, and calibrating the secondary receiver's measurements to produce accurate results.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the primary receiver is activated frequently to perform mobility measurements, then measurement accuracy and mobility robustness are improved, but energy consumption increases

Engineering Contradiction:

Improvemobility measurement accuracyVSAvoidreceiver energy consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The receiver functionality is segmented into two distinct receivers: a primary receiver with full functionality for accurate measurements, and a secondary low-power receiver for basic measurements. This segmentation allows the system to use the appropriate receiver based on operational state, reducing overall energy consumption while maintaining measurement accuracy when needed.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a secondary receiver that is simpler and consumes less power than the primary receiver. This secondary receiver is used for basic mobility measurements in idle/inactive modes, sacrificing some functionality to achieve significant energy savings. The primary receiver remains available when full functionality is required.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Use of energy by moving object

If the primary receiver remains in deep sleep state to save energy, then energy consumption is reduced, but measurement capability is compromised

Engineering Contradiction:

Improvereceiver energy consumptionVSAvoidmobility measurement reliability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The secondary receiver acts as an intermediary between the deep-sleep primary receiver and the measurement requirements. When the primary receiver is in deep sleep, the secondary receiver performs basic mobility measurements, providing a middle ground that maintains measurement capability without requiring the high-power primary receiver to be active.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system performs preliminary mobility measurements using the secondary receiver before potentially activating the primary receiver. This preliminary action allows the system to assess whether full measurement capability is needed, reducing unnecessary activations of the primary receiver and saving energy.

Inventive Principle:

Principle #10Preliminary action

3Use of energy by moving object

If periodic measurements are performed once per DRX cycle, then energy consumption is reduced, but measurement frequency and responsiveness are lowered

Engineering Contradiction:

Improvemeasurement energy consumptionVSAvoidmeasurement response speed

Core Design Contradiction:

Use of energy by moving objectVSSpeed

Solution Approach 1:

The measurement system dynamically adapts its behavior based on operational state. In idle/inactive modes, the secondary receiver performs measurements at appropriate intervals. When transitioning to connected mode or when mobility events are detected, the system can increase measurement frequency and activate the primary receiver, providing dynamic responsiveness to changing conditions.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20260025648A1Power efficient mobility measurements in a wireless communication device

Publication Date: 2026.01.22 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A wireless communication device is operated in a wireless communication network, wherein the wireless communication device comprises a first receiver that consumes power at a first rate, and a second receiver that consumes power at a second rate, wherein the first rate is higher than the second rate. Operation of the device includes obtaining one or more calibration factors that relate time domain properties of transmitted signals when received by the first receiver and time domain properties of the transmitted signals when received by the second receiver, and using the second receiver to collect signal information from one or more transmissions of a measurement object that is located within corresponding one or more radiofrequency transmissions performed by the wireless communication network. The signal information collected by the second receiver and the one or more calibration factors are used to produce a measurement result representative of one or both of signal power and link quality of a communication link between the wireless communication device and the wireless communication network. The measurement result is used as a basis for deciding whether or not to execute a mobility procedure.