RRC 5G UE -> gNB 3GPP TS 38.331

5G NR - Location Measurement Indication

Location Measurement Indication is the NR RRC message used by the UE to indicate location-related measurement information toward the network.

Message Fact Sheet

Protocol	rrc	Network	5g
Spec	3GPP TS 38.331	Spec Section	6.2.2
Direction	UE -> gNB	Message Type	Location / Measurement Reporting

Full message name	5G NR - Location Measurement Indication
Protocol	RRC
Technology	5G
Direction	UE -> gNB
Interface	Uu
Signaling bearer / channel	SRB1 / UL-DCCH
Typical trigger	Used when location-related measurement reporting or indication is required.
Main purpose	Provides a dedicated signaling path for location-oriented measurement indications when the network needs that information for positioning or location-aware handling.
Main specification	3GPP TS 38.331, 6.2.2
Release added	Release 16
Procedures where used	Location and Positioning Support, Location Measurement Reporting
Related timers	None highlighted

What is Location Measurement Indication in simple terms?

Location Measurement Indication is the NR RRC message used by the UE to indicate location-related measurement information toward the network.

Provides a dedicated signaling path for location-oriented measurement indications when the network needs that information for positioning or location-aware handling.

Why this message matters

Location Measurement Indication lets the UE send location-related measurement information to the network.

Where this message appears in the call flow

Location and Positioning Support

Call flow position: Sent when the UE provides location-related measurement indication to the network.

Typical state: UE is in connected mode with location-related reporting context.

Preconditions:

The network has configured or expects location-related measurement handling.

Next likely message: Network positioning handling or follow-on configuration

Call flow position

Previous message(s): RRC Reconfiguration, UE Positioning Assistance Info

Next message(s): Positioning handling at the network, Possible follow-on assistance or reconfiguration

Message direction and transport

Sender and receiver: UE -> gNB

Interface: Uu

Domain: Access-side radio control with location-measurement reporting

Signaling bearer: SRB1

Logical channel: UL-DCCH

Transport / encapsulation: Dedicated protected RRC signaling on DCCH

Security context: Sent as protected connected-mode signaling.

Message Structure Overview

The main value is the location-related indication payload rather than the outer wrapper.

ASN.1 for 5G NR - Location Measurement Indication

LocationMeasurementIndication ::= SEQUENCE {
  locationMeasurementInfo OCTET STRING
}

How to read this ASN.1

Engineers mainly correlate this message with positioning procedures and later network-side handling.

Decoded Message Dump

UL-DCCH-Message
  message: locationMeasurementIndication
    locationMeasurementInfo: present

How to read this dump

The content should line up with the positioning or location workflow being tested.

Important Information Elements

IE	Required	Description
`locationMeasurementInfo`	Yes	Carries the location-related measurement indication content.

Detailed field explanation

`locationMeasurementInfo`

Carries the location-related measurement indication content.

Presence: Required

In practice: In practice, compare this field with the original request and with any later release-dependent optional fields so you can see whether the network accepted the same service model the UE asked for.

What to check in logs and traces

Correlate the message with the positioning scenario and prior configuration.
Check whether the network responds or consumes the indication as expected.

Common Issues and Troubleshooting

The network never gets the expected location-related indication.

Likely cause: The UE may not have sent the indication or the preconditioned configuration may be missing.

What to inspect: Check for this message and the configuration that should have triggered it.

Next step: Compare it with measurement and positioning assistance signaling.

FAQ

What does Location Measurement Indication do?

It carries location-related measurement indication information from the UE to the network.

Related message pages

Related Procedures

5G RRC Reconfiguration

Related Tools

Use This Reference in Practice

Decode this message with the 3GPP Decoder, inspect the related message database, or open the matching call flow to see where this signaling step fits in the full procedure.