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LTE Application Layer Measurement Reporting Call Flow

call-flow LTE | Optimization | Application Layer Measurements

LTE application layer measurement reporting is the reporting path used when the network needs measurement information that reflects application-layer or service-level behavior rather than only radio-layer conditions.

This page focuses on the reporting path itself and how it fits into LTE optimization workflows.

Introduction

The network enables the relevant reporting behavior, the UE collects the requested application-facing result, and the report is returned to the network for later optimization or analytics use.

Use this page when the trace is optimization-facing and the result is not limited to classic mobility events.

What Is Application Layer Measurement Reporting in Simple Terms?

What starts the procedure: The network needs application-facing measurement insight from the UE.
What the UE and network want to achieve: Return application-layer or service-level measurement data for later analysis.
What success looks like: The expected application-layer measurement result is delivered to the network.
What failure means: The report is missing, not aligned with the requested context, or not useful for the intended analysis.

Why this procedure matters

This page helps separate application-facing measurement behavior from pure radio event reporting. It is useful when later optimization questions depend on service-level observations rather than only RF conditions.

Quick Fact Sheet

Procedure name	LTE Application Layer Measurement Reporting
Domain	Optimization and analytics
Main trigger	The network requests application-facing measurement data
Start state	UE is connected with the relevant reporting setup active
End state	Application-layer measurement result is available to the network
Main nodes	UE, eNB
Main protocols	RRC and related higher-layer reporting context
Main success outcome	Requested application-facing result is delivered
Main failure outcome	Missing or unusable application-facing report
Most important messages	Application-layer reporting configuration and result delivery
Main specs	TS 36.331 and related reporting behavior

LTE Application Layer Measurement Reporting — Click the diagram to open the full-size in a new tab.

Preconditions

The UE is in connected LTE service.
The scenario requires application-facing or service-level reporting.
The relevant reporting configuration is active.

Nodes and Interfaces

Nodes involved

Node	Role in this procedure
UE	Applies measurement rules, performs the configured observations, and sends the relevant result back to the network.
eNB	Configures measurement behavior, interprets results, and uses them for mobility, optimization, or analytics decisions.

Interfaces used

Interface	Path	Role
LTE Uu	UE <-> eNB	Carries measurement configuration, reporting, and any later control action based on the result.

End-to-End Call Flow

UE                    eNB
|<--app-layer report config--|
|--app-layer result--------->|
|   analytics / optimization |

Major Phases

Phase	What happens
1. Reporting setup	The network enables the application-facing reporting behavior.
2. Result collection	The UE collects the requested application-facing measurement context.
3. Report delivery	The UE returns the result to the LTE side.
4. Analytics use	The network consumes the result in optimization or analysis workflows.

Step-by-Step Breakdown

Step 1: Configure application-layer reporting

Sender -> receiver: Network -> UE

Message(s): Application-layer reporting setup

Purpose: Request the application-facing result needed by the network.

State or context change: The UE starts the requested reporting behavior.

Note: This path is broader than classic neighbor-event reporting.

Step 2: Collect the requested result

Sender -> receiver: UE

Message(s): Application-facing observation

Purpose: Generate the requested application-layer measurement context.

State or context change: The UE has the data needed for the report.

Note: The observation focus is service-level rather than only RF-level.

Step 3: Return the report

Sender -> receiver: UE -> Network

Message(s): Application Layer Measurement Report

Purpose: Deliver the requested result to the network.

State or context change: The network now has the application-facing measurement outcome.

Note: The report is usually consumed by an optimization or analytics workflow.

Step 4: Use the result later

Sender -> receiver: Network

Message(s): Optimization or analytics handling

Purpose: Interpret the application-facing result for later analysis.

State or context change: The result becomes part of the higher-layer optimization view.

Note: This page stops at the reporting stage.

Important Messages

Message	Protocol	Direction	Purpose in this procedure	What to inspect briefly
Application Layer Measurement Report	RRC or related reporting context	UE -> Network	Returns the requested application-facing measurement result.	Check whether the report matches the requested service-level context.
Reporting configuration	RRC	Network -> UE	Enables the application-facing reporting behavior.	Check the requested reporting scope before interpreting the result.

Important Parameters to Inspect

Parameter	What it is	Where it appears	Why it matters	Common issues
Reporting scope	The application-facing context the network asked for.	Reporting configuration	Explains why this report exists in the trace.	The report is interpreted without checking what was requested.
Result payload	The actual application-level observation returned by the UE.	Application Layer Measurement Report	Shows whether the request produced usable output.	The result is present but read against the wrong service context.
Timing	When the report appears relative to the reporting setup.	Trace timing	Useful for missing or delayed reporting analysis.	The report is treated as late without checking the setup time.
Service context	The service or application scenario tied to the report.	Configuration and surrounding trace	Needed to interpret the report correctly.	A generic LTE scenario is assumed instead of the real service context.
Later analytics use	How the network consumes the result later.	Follow-up analysis	Shows whether the report was useful to the intended workflow.	The report exists but never feeds the expected analysis branch.

Successful Completion

Success means the requested application-layer measurement result is returned and can be used in the intended optimization or analytics workflow.

Common Failures and Troubleshooting

Symptom	Likely cause	Where to inspect	Relevant message(s)	Relevant interface(s)	Likely next step
Expected application-layer report is missing	The reporting behavior was never activated correctly or the requested service context was not present.	Reporting setup and expected result window.	Application Layer Measurement Report	LTE Uu	Check the reporting scope before treating the missing result as a general LTE failure.

What to Check in Logs and Traces

Check what application-facing context was requested before reading the report.
Separate this reporting path from classic radio event reporting.
Correlate the report with the optimization or analytics scenario being investigated.

Related sub-procedures

Related message reference pages

Related troubleshooting pages

Notes

Application Layer Measurement Reporting is analytics-facing. It should be interpreted in the service context that requested the report.

FAQ

What is LTE Application Layer Measurement Reporting?

It is the LTE reporting path used when the network collects application-facing or service-level measurement results from the UE.