Measurement Reporting Prohibit Timer for UAV Interference

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Solution Overview

Problem

In wireless communication networks, particularly in LTE and 5G NR systems, unmanned aerial vehicles (UAVs) can trigger multiple measurement reports consecutively due to different cell/reference signal configurations, leading to interference and impacting conventional user equipment (UE) performance, as they fly above base station antenna height, increasing uplink signal visibility and interference to neighbor cells.

Innovation Solution

Implementing a prohibit timer or counter mechanism in wireless devices and network nodes to limit the transmission of measurement reports, ensuring that reports are only sent at specific intervals (e.g., every second, third time) when the same event is triggered, preventing consecutive triggering and reducing unnecessary reporting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If UAVs trigger measurement reports for each cell configuration change, then network can track signal quality and perform handover, but excessive reporting causes interference and degrades conventional UE performance

Engineering Contradiction:

Improvehandover reliabilityVSAvoidinterference to neighbor cells

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent implements a prohibit timer that creates periodic suppression of measurement reports. After a measurement report is triggered, the prohibit timer prevents triggering of reports for a specified duration (e.g., 100ms), creating a periodic action pattern that limits excessive reporting while maintaining necessary handover functionality.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent extracts and suppresses redundant measurement reports that would cause interference. By identifying reports that would be triggered within the prohibit timer period and preventing them, the system removes harmful repetitive reporting while preserving essential handover information.

Inventive Principle:

Principle #2Taking out (Extraction)

2Loss of information

If measurement reports are sent every time an event is triggered, then network receives comprehensive signal information, but reporting frequency increases causing network overload and interference

Engineering Contradiction:

Improvesignal quality informationVSAvoidnetwork throughput

Core Design Contradiction:

Loss of informationVSProductivity

Solution Approach 1:

The patent applies partial action by selectively suppressing only the excessive portion of measurement reports. The prohibit timer mechanism allows the first report to pass through while blocking subsequent reports within the timer duration, achieving partial suppression that reduces network load while preserving essential information.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The prohibit timer implements periodic suppression logic that creates rhythm in report transmission. This periodic action pattern ensures sufficient information is gathered for handover decisions while preventing continuous reporting that would overwhelm the network and cause interference.

Inventive Principle:

Principle #19Periodic action

3Measurement precision

If the network allows free measurement reporting from aerial UEs, then mobility management is accurate, but interference to ground-based conventional UEs increases

Engineering Contradiction:

Improvemobility management accuracyVSAvoidinterference to conventional UEs

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by differentiating treatment based on UE location and reporting context. The prohibit timer mechanism creates localized suppression zones in time and space, allowing reports from aerial UEs at certain moments while preventing reports at other moments, thereby reducing interference to ground-based conventional UEs while maintaining mobility management accuracy.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The periodic suppression through prohibit timer creates rhythmic patterns in measurement reporting from aerial UEs. This timing-based differentiation allows the network to receive sufficient reports for accurate mobility management while preventing continuous reporting that would cause interference to conventional ground-based UEs.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS11166185B2Measurement reporting prohibit timer for measurement of signals originating from two different cells or beams

Publication Date: 2021.11.02 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

According to some embodiments, a method in a wireless device of limiting transmission of measurement reports comprises receiving a first measurement triggering event for an event type. The first measurement triggering event is associated with a first wireless signal. The method further comprises: transmitting a measurement report for the first measurement triggering event; initiating a measurement reporting limiting procedure for the event type; and receiving a second measurement triggering event for the event type. The second measurement triggering event is associated with a second wireless signal different than the first wireless signal. The method further comprises determining the measurement reporting limiting procedure is active for the event type and determining not to transmit a measurement report for the second measurement triggering event. In some embodiments, the wireless device comprises an unmanned aerial vehicle (UAV).