LTE RRC InterFreqRSTD Measurement Indication r10

Message Fact Sheet

Protocol	lte-rrc	Network	lte
Spec	3GPP TS 36.331	Spec Section	5.5, 6.2.2
Direction	UE -> eNodeB	Message Type	Positioning / Measurement Indication

Full message name	LTE RRC InterFreqRSTD Measurement Indication r10
Protocol	LTE-RRC
Technology	LTE
Direction	UE -> eNodeB
Interface	Uu
Signaling bearer / channel	SRB1 / UL-DCCH
Typical trigger	Triggered when the UE needs to indicate inter-frequency RSTD measurement status in a positioning-related branch.
Main purpose	Lets the UE inform the network about inter-frequency RSTD measurement progress or constraints so positioning-related control can continue correctly.
Main specification	3GPP TS 36.331, 5.5, 6.2.2
Release added	Release 10
Procedures where used	LTE positioning support, Inter-frequency RSTD measurement handling

What is LTE RRC InterFreqRSTD Measurement Indication r10 in simple terms?

Uplink LTE RRC message used by the UE to indicate status around inter-frequency RSTD measurement handling for positioning-related procedures.

Lets the UE inform the network about inter-frequency RSTD measurement progress or constraints so positioning-related control can continue correctly.

Why this message matters

InterFreqRSTD Measurement Indication r10 is an LTE positioning-related UE indication used in inter-frequency RSTD measurement handling.

Where this message appears in the call flow

Inter-frequency RSTD positioning indication

LTE flow showing InterFreqRSTD Measurement Indication r10 during positioning-related measurement handling — The message appears in a positioning-oriented branch when the network needs UE-side inter-frequency RSTD measurement status.

Call flow position: UE indication sent during a positioning-related measurement branch.

Typical state: The network is coordinating inter-frequency RSTD handling and needs UE-side status.

Preconditions:

The UE has received relevant measurement configuration.
A positioning-oriented measurement branch is active.

Next likely message: Later positioning or measurement continuation

Positioning measurement continuation

LTE flow showing InterFreqRSTD Measurement Indication r10 before later positioning continuation — The indication helps the network decide how the broader positioning-related measurement branch should continue.

Call flow position: UE-side status update used to continue or adapt the broader positioning branch.

Typical state: The message helps the network interpret whether inter-frequency RSTD measurement can continue as expected.

Preconditions:

Inter-frequency RSTD measurement handling is active.

Next likely message: Follow-on positioning control

Call flow position

Previous message(s): RRCConnectionReconfiguration

Next message(s): Positioning-related continuation, Later measurement handling

Message direction and transport

Sender and receiver: UE -> eNodeB

Interface: Uu

Domain: Access-side radio control with positioning support

Signaling bearer: SRB1

Logical channel: UL-DCCH

Transport / encapsulation: Protected LTE RRC signaling in connected mode

Security context: Sent as protected connected-mode signaling.

Message Structure Overview

InterFreqRSTDMeasurementIndication-r10 is a specialized uplink LTE RRC indication for positioning-related measurement control.

ASN.1 for LTE RRC InterFreqRSTD Measurement Indication r10

InterFreqRSTDMeasurementIndication-r10 ::= SEQUENCE {
  criticalExtensions CHOICE {
    c1 CHOICE {
      interFreqRSTDMeasurementIndication-r10 InterFreqRSTDMeasurementIndication-r10-IEs,
      spare3 NULL,
      spare2 NULL,
      spare1 NULL
    },
    criticalExtensionsFuture SEQUENCE {}
  }
}

How to read this ASN.1

The message is best read in a positioning context rather than a general LTE mobility context.

LTE RRC InterFreqRSTD Measurement Indication r10 - Example Dump

UL-DCCH-Message
  message c1 : interFreqRSTDMeasurementIndication-r10 : {
    criticalExtensions c1 : interFreqRSTDMeasurementIndication-r10 : {
      purpose-r10 positioning
    }
  }

How to read this dump

The procedure context is usually more informative than the wrapper fields alone.

Important Information Elements

IE	Required	Description
`criticalExtensions`	Yes	Carries the InterFreqRSTDMeasurementIndication-r10 branch.
`purpose-r10`	Optional	Indicates the positioning-related purpose or measurement status of the message.

Detailed field explanation

`criticalExtensions`

Carries the InterFreqRSTDMeasurementIndication-r10 branch.

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.

`purpose-r10`

Indicates the positioning-related purpose or measurement status of the message.

Presence: Optional

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

Check what positioning or measurement branch is active.
Correlate the message with earlier inter-frequency measurement configuration.
Follow the later positioning-related control path.

Common Issues and Troubleshooting

Positioning-related measurement handling does not progress as expected.

Likely cause: The network may be waiting for or misreading inter-frequency RSTD measurement indication context.

What to inspect: Check whether the indication appears and how it lines up with the surrounding positioning branch.

Next step: Treat the issue as positioning-measurement control rather than ordinary handover reporting.

FAQ

What is InterFreqRSTD Measurement Indication r10 in LTE?

It is an uplink LTE RRC indication used in inter-frequency RSTD positioning-related measurement handling.

Related message pages

Related Procedures

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.