Configuring GTP on FortiOS Carrier

Mobility Management Messages

 

 

Message Type

Used

By

 

Description

 

Identification Request/Re- sponse

 

GTP-C

 

Sent by the new SGSN to the old SGSN to request the IMSI for a MS when a GPRS Attach is done with a P-TMSI and the MS has changed SGSNs since the GPRS Detach was done.

 

SGSN context Request/ Response/ Acknowledge

 

GTP-C

 

Sent by the new SGSN to the old SGSN to request the MM and

PDP Contexts for the MS.

 

Forward Relocation Request/ Response/ Complete/ Com- plete Acknowledge

 

GTP-C

 

Indicates mobile activation/deactivation within a Routing Area. This prevents paging of a mobile that is not active (visited VLR rejects calls from the HLR or applies Call Forwarding). Note that the mobile station does not maintain an attach/detach state.

     

SRNS contexts contain for each concerned RAB the sequence numbers of the GTP-PDUs next to be transmitted in uplink and downlink directions.

 

Relocation Cancel Request/ Response

 

GTP-C

 

Send to cancel the relocation of a connection.

 

Forward SRNS Context/ Con- text Acknowledge

 

GTP-C

 

This procedure may be used to trigger the transfer of SRNS con- texts from RNC to CN (PS domain) in case of inter system for- ward handover.

     

Forward the Routing Area Network (RAN) information.

 

RAN Information Relay

 

GTP-C

 

A Routing Area (RA) is a subset of a GSM Location Area (LA). A RA is served by only one SGSN. Ensures that regular radio con- tact is maintained by the mobile

 

MBMS messages

   
 

Message Type

Used

By

 

Description

 

MBMS Notification Request/ Response/ Reject Request/ Reject Response

 

GTP-C

 

Notification of the radio access devices.

 

 

 

Create MBMS Context

Request/ Response

 

 

 

GTP-C

 

Request to create an active MBMS context. The context will be pending until the response is received.

 

Once active, the MBMS context allows the MS to receive data from a specific MBMS source

 

Message Type                          Used

By

Description

 

Update MBMS Context

Request/ Response

Delete MBMS Context

Request/ Response

GTP-C

GTP-C      Request to deactivate the MBMS context. When the response is received, the MBMS context will be inactive.

 


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