MAPS™ UMTS for IuPS Interface Emulator
(Scripted UMTS IuPS Emulation over IP)
UMTS, or Universal Mobile Telecommunications System is a 3rd generation mobile technology evolved from GSM technology. It uses W-CDMA (Wideband Code Division Multiple Access) as radio access. With increased spectral efficiency and high bandwidth, UMTS can support broadband data, voice and video. The underlying transport for UMTS in the core network can be Asynchronous Transfer Mode (ATM), or IP.
UMTS supports integrated services such as multimedia and global roaming to mobile users. In essence, UMTS IuPs interface is the Gateway to the World Wide Web. More precisely, IuPs, as shown in the figure, is the interface between the RNC (Radio Network Controller) and the SGSN (Serving GPRS Support Node).
SGSN manages mobile location whether within the carrier's network or roaming outside. Once a user turns on her mobile, a new IP address gets assigned and IP connectivity is available with quality of service (bit rate allocation) based on subscription, and tunnels are created for mobile flows to/from that mobile. These data tunnels carry encapsulated traffic such as http, ftp, email, etc. SMS may also be carried by the signaling plane to/from the mobile. IuPs emulation and analysis can be very important in the design, verification, and troubleshooting of a carrier's mobile data network.
The IP based UMTS network consists of the following components -
- Radio Network Controller (RNC)
- Mobile Switching Centre (MSC)
- Serving GPRS Support Node (SGSN)
- Gateway GPRS Support Node (GGSN)
- Femto Home NodeB (Femto Cell) and Femto Home Node Gateway (HNB-GW)
GL's Message Automation & Protocol Simulation (MAPS™), is a protocol simulation and conformance test tool that supports a variety of protocols such as SIP, MEGACO, ISDN, SS7, GSM, LTE, and many other TDM, IP, and Wireless protocols. MAPS™ has been enhanced for testing UMTS IuPs interface. It can simulate RNC (Radio Network Controller), and 3G SGSN (3G Serving GPRS Support Node) by generating RANAP and DTAP signaling messages over SCTP as Transport layer in an IP network as defined by 3GPP standards.
The application gives the users the unlimited ability to edit messages and control scenarios (message sequence). “Message sequences” are generated
through scripts. “Messages” are created using message templates.
The application is available as
- MAPS™ - IuPS (Item # PKS164)
In addition, GL also supports the following UMTS analyzers and simulators:
The product also supports Mobile traffic core – GTP (ETH101) simulation for user-plane packet transmission and reception services between any two nodes in LTE and UMTS networks. Mobile Traffic Core – Gateway (ETH102) module allows simulation of Gateway Traffic to test media gateway telephony interfaces over IP. These modules also support generation and verification of data traffic such as Email, FTP, Web (HTTP), Video, and more.
- Simulates RNC, and SGSN entities.
- Generates and supports all Mobility Management, Session Management, RANAP and DTAP messages.
- User controlled access to RANAP, and DTAP messages.
- Ready scripts for Routing Area Updating, GPRS Attach, and Detach procedures for quick testing.
- Supports Authentication, TMSI Reallocation, Encryption, and other optional procedures
- Supports mobile traffic simulation with additional licenses
- Provides fault insertion, and erroneous call flows testing capability.
- Impairments can be applied to messages to simulate error conditions
- Supports customization of call flows and message templates using Script editor and Message editor.
- Supports scripted call generation and automated call reception.
- Supports mobile traffic simulation with additional licenses
- Provides detail protocol trace with full message decoding, and graphical ladder diagrams of call flow with time stamp
- Call flow graph allows to easily verify the messages exchanged with DUT
- Displays call status, results, call information, total iterations to be done, and completed iterations
- Script based & protocol independent software architecture.
- Provides call statistics and associated captured events and error events during call simulation.
Supported Protocol Standards
UMTS IuPS Protocol Stack
||Q.713, CCITT (ITU-T) Blue Book
||3GPP TS 25.413 V9.1.0
|GMM / SM
||3GPP TS 24.008 V5.16.0 (2006-06)
||3GPP TS 03.40 V7.5.0 & 3GPP TS 04.11 V7.1.0 GSM 03.38 version 7.2.0 Release 1998
The test configuration window allows users to configure the necessary parameters in order to establish communication between MAPS™ and the DUT.
The MAPS™ UMTS configuration window consists of SCTP configuration for Iu-PS interfaces. Default profile used to configure MAPS™ UMTS IuPS with SGSN or RNC parameters.
Screenshot of Testbed Setup to configure MAPS™ as IuPS Nodes
Typical Call Flow between the UMTS IuPS network entities
Call Generation option allows the user to simulate outgoing communications where an outgoing call is initiated by sending call control messages using proper
scripts and profiles. The profile allows necessary parameters of call control messages to be changed during runtime. Messages are exchanged between
MAPS™ and the DUT. MAPS™ application acts as either the Caller or resides at the network terminal acting as Callee.
In this document, we are considering the call flow between the RNC and SGSN nodes for Attach Request and Routing Area Updating (RAU) procedures.
Testing SGSN (Attach Procedure)
As depicted in figure below, MAPS™ - IuPS acts as RNC processing the call flow and responds to messages from SGSN Node. The MAPS initiates the Attach Procedure by sending Attach Request to the DUT (SGSN). The DUT on receipt of ATTACH REQUEST message should send a CC connection confirm message in response as shown in the figure below.
MAPS™ UMTS IuPS configured as RNC
Call Generation at RNC Node
Call generated from another entity can be automatically detected in call reception window by pre-setting the required scripts in the Incoming Call Handler
As seen in the figure below, MAPS™ acts as SGSN, and tests the DUT that is configured as RNC. This test is performed to ensure that the MAPS™ (SGSN) on receipt of ATTACH REQUEST message from RNC, sends a CC connection confirm message in response. MAPS™ responds to the messages received from RNC and then completes the call flow.
MAPS™ UMTS IuPS configured as SGSN
Call Reception at SGSN Node
Bulk Call Simulation
MAPS™ supports Bulk Call Simulation and Stress/Load Testing capabilities through Load Generation feature. Load Generation window helps users
configure Stress/Load Testing parameters such as Call per second (CPS) or Busy hour call attempts (BHCA), Max Simultaneous Calls and Burst parameters.
Screenshot of Load Generation Parameters
Customization of Call Flow and Messages Using Pre-Processing Tools
Call Flow & Script Execution Control
Message Sequence - MAPS™ provides protocol trace with full message decoding, custom trace, and graphical ladder diagrams of call flow
with time stamp while simulation is running. Call flow graph allows to easily verifying the messages exchanged between MAPS™ and DUT.
See Call Generation and Call Reception for details
Script Contents & Script Flow - The Scripts Contents window displays the contents of the script selected for call generation or reception. The
Script Flow window displays the set of statements successfully executed by MAPS™ to help users in troubleshooting a particular the call scenario.
Events & Event Profile Editor - User-defined events allow redirection of script execution on-the-go. The custom parameters in the events can
also be changed during script execution using Event Profiles.
Screenshot of Script Contents and Script Flow
Call Statistics, Events, Link Status
Call Statistics & Status - By default, all call handling scripts (irrespective of the type of the functions) are assessed by MAPS™ to provide statistical information about Total Calls, Active Calls, Completed Calls, Passed Calls, Failed Calls, and Calls/Sec . It is also possible to characterize the statistical information under different groups of call handling scripts under a unique heading. In addition, Call Generation and Call Reception windows provide useful call status & script execution results.
In addition, Call Generation and Call Reception windows provide useful call status & script execution results.
Screenshot of Call Statistics and Status
Events Reporting – MAPS™ provides Event Log, Error Events, and Captured Errors windows that log the captured events and errors
encountered during the progress of the call.
Screenshot of Event Log
Link Status - Link Status window indicates transport related information of the protocol, for example, if SCTP is used as transport, it indicates if
the association is Up or Down in the Link Status window.
Specifications are subject to change without notice.
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