User Location Information Reporting - Cisco ASR 5x00 Administration Manual

▀ Features and Functionality - Optional Enhanced Feature Software
Important:
guide.

User Location Information Reporting

Use of User Location Information (ULI) Reporting requires that a valid license key be installed. Contact your local
Sales or Support representative for information on how to obtain a license.
ULI Reporting allows the eNodeB to report the location of a UE to the MME, when requested by a P-GW.
The following procedures are used over the S1-MME interface to initiate and stop location reporting between the MME
and eNodeB:
 Location Reporting Control: The purpose of Location Reporting Control procedure is to allow the MME to
request that the eNodeB report where the UE is currently located. This procedure uses UE-associated signaling.
 Location Report Failure Indication: The Location Report Failure Indication procedure is initiated by an
eNodeB in order to inform the MME that a Location Reporting Control procedure has failed. This procedure
uses UE-associated signalling.
 Location Report: The purpose of Location Report procedure is to provide the UE's current location to the
MME. This procedure uses UE-associated signalling.
The start/stop trigger for location reporting for a UE is reported to the MME by the S-GW over the S11 interface. The
Change Reporting Action (CRA) Information Element (IE) is used for this purpose. The MME updates the location to
the S-GW using the User Location Information (ULI) IE.
The following S11 messages are used to transfer CRA and ULI information between the MME and S-GW:
 Create Session Request: The ULI IE is included for E-UTRAN Initial Attach and UE-requested PDN
Connectivity procedures. It includes ECGI and TAI. The MME includes the ULI IE for TAU/ X2-Handover
procedure if the P-GW has requested location information change reporting and the MME support location
information change reporting. The S-GW includes the ULI IE on S5/S8 exchanges if it receives the ULI from
the MME. If the MME supports change reporting, it sets the corresponding indication flag in the Create
Session Request message.
 Create Session Response: The CRA IE in the Create Session Response message can be populated by the S-GW
to indicate the type of reporting required.
 Create Bearer Request: The CRA IE is included with the appropriate Action field if the Location Change
Reporting mechanism is to be started or stopped for the subscriber in the MME.
 Modify Bearer Request: The MME includes the ULI IE for TAU/Handover procedures and UE-initiated
Service Request procedures if the P-GW has requested location information change reporting and the MME
supports location information change reporting. The S-GW includes this IE on S5/S8 exchanges if it receives
the ULI from the MME.
 Modify Bearer Response: The CRA IE is included with the appropriate Action field if the Location Change
Reporting mechanism is to be started or stopped for the subscriber in the MME.
 Delete Session Request: The MME includes the ULI IE for the Detach procedure if the P-GW has requested
location information change reporting and MME supports location information change reporting. The S-GW
includes this IE on S5/S8 exchanges if it receives the ULI from the MME.
 Update Bearer Request: The CRA IE is included with the appropriate Action field if the Location Change
Reporting mechanism is to be started or stopped for the subscriber in the MME.
▄ Cisco ASR 5x00 Packet Data Network Gateway Administration Guide
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For more information on traffic policing, refer to the Traffic Policing and Shaping appendix in this
PDN Gateway Overview