LTE RRC WLAN Connection Status Report r13

Message Fact Sheet

Protocol	lte-rrc	Network	lte
Spec	3GPP TS 36.331	Spec Section	5.6, 6.2.2
Direction	UE -> eNodeB	Message Type	WLAN Status Reporting

Full message name	LTE RRC WLAN Connection Status Report r13
Protocol	LTE-RRC
Technology	LTE
Direction	UE -> eNodeB
Interface	Uu
Signaling bearer / channel	SRB1 / UL-DCCH
Typical trigger	Triggered when WLAN connection status needs to be reported to the LTE network.
Main purpose	Lets the UE inform the eNodeB about WLAN connection state so the network can continue or adjust WLAN interworking decisions.
Main specification	3GPP TS 36.331, 5.6, 6.2.2
Release added	Release 13
Procedures where used	WLAN interworking status reporting

What is LTE RRC WLAN Connection Status Report r13 in simple terms?

Uplink LTE RRC message used by the UE to report WLAN connection status relevant to LTE and WLAN interworking handling.

Lets the UE inform the eNodeB about WLAN connection state so the network can continue or adjust WLAN interworking decisions.

Why this message matters

WLAN Connection Status Report r13 tells the LTE network what WLAN connection state the UE currently has.

Where this message appears in the call flow

WLAN connection status reporting

LTE flow showing WLAN Connection Status Report r13 sent during WLAN interworking status reporting — The UE reports WLAN connection state so the eNodeB can use that status in LTE and WLAN interworking decisions.

Call flow position: UE report sent to expose WLAN connectivity state to the eNodeB.

Typical state: The network can use the report in later LTE and WLAN interworking decisions.

Preconditions:

The UE is in connected mode.
WLAN interworking context or status reporting is relevant.

Next likely message: Later connected-mode WLAN-aware handling

WLAN fallback or recovery reporting

LTE flow showing WLAN Connection Status Report r13 after a WLAN status change — A later WLAN status update helps the network understand whether WLAN continuity or offload is still available.

Call flow position: UE report sent when WLAN status changed and the network needs an updated view of the interworking branch.

Typical state: The message helps the eNodeB distinguish whether WLAN offload or WLAN continuity is still available.

Preconditions:

WLAN status changed or became relevant to ongoing service handling.

Next likely message: Network continuity or optimization continuation

Call flow position

Previous message(s): RRCConnectionReconfiguration

Next message(s): WLAN-aware continuation, Later connected-mode optimization

Message direction and transport

Sender and receiver: UE -> eNodeB

Interface: Uu

Domain: Access-side radio control with LTE and WLAN interworking 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

WLANConnectionStatusReport-r13 is an uplink status report used in LTE and WLAN interworking contexts.

ASN.1 for LTE RRC WLAN Connection Status Report r13

WLANConnectionStatusReport-r13 ::= SEQUENCE {
  criticalExtensions CHOICE {
    c1 CHOICE {
      wlanConnectionStatusReport-r13 WLANConnectionStatusReport-r13-IEs,
      spare3 NULL,
      spare2 NULL,
      spare1 NULL
    },
    criticalExtensionsFuture SEQUENCE {}
  }
}

How to read this ASN.1

Read this message mainly through the WLAN status it reports and the interworking branch around it.

LTE RRC WLAN Connection Status Report r13 - Example Dump

UL-DCCH-Message
  message c1 : wlanConnectionStatusReport-r13 : {
    criticalExtensions c1 : wlanConnectionStatusReport-r13 : {
      wlan-Status-r13 connected
    }
  }

How to read this dump

The useful field is the reported WLAN connection status.

Important Information Elements

IE	Required	Description
`wlan-Status-r13`	Yes	Carries the WLAN connection status reported by the UE.

Detailed field explanation

`wlan-Status-r13`

Carries the WLAN connection status reported by the UE.

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

Check which WLAN status the UE reported.
Compare the message with the surrounding LTE and WLAN interworking branch.
Follow the later network reaction.

Common Issues and Troubleshooting

WLAN offload or interworking behavior looks inconsistent.

Likely cause: The network may be working from WLAN connection status that changed, was delayed, or was not reported.

What to inspect: Check whether WLAN Connection Status Report r13 appears and what status it carries.

Next step: Read it together with later continuity or optimization actions.

FAQ

What is WLAN Connection Status Report r13 in LTE?

It is the uplink LTE RRC message the UE uses to report WLAN connection status to the eNodeB.

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.