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Comprehensive SGSN Testing with TTCN-3: Enhancing Automation and Functional Coverage

This document outlines the SGSN development project led by Peter Eldh between January and June 2004, highlighting the integration of TTCN-3 as a functional test tool for both GSM and WCDMA networks. The project focused on the automation of around 1500 legacy functional test cases to enhance speed, debug capabilities, and usability. Emphasizing the necessary structural changes and new test objects, the project successfully aimed to cover 80% of legacy requirements while ensuring effective SGSN testing through advanced testing methodologies and configurations.

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Comprehensive SGSN Testing with TTCN-3: Enhancing Automation and Functional Coverage

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  1. PDU PCN TTCN 3 in SGSN testing Peter Eldh

  2. Our business

  3. TTCN 3 introduction project SGSN development project Jan.2004 June2004 Introducing TTCN 3 • Why? • The same functional test tool for both GSM & WCDMA access • Automation • New test ports, interfaces and test objects needed • Wanted the advantages in TTCN 3 (speed, debug, usability…) • Re-writing of existing test cases (automation requirements, different structure to support new test objects) • How? • Separate project with GA targeting the start of a SGSN development project • 7 persons – 6 I&V and 1 PLM • Goal: Covering 80 % of the legacy functional req. with automated test cases ~ 1500 test cases

  4. SGSN environment SMS - GMSC SM - SC SMS - IWMSC E C CAMEL GSM SCF Gd AUC MSC/VLR HLR Ge D Gs A Iu Gc Gr R Uu Iu Gi PDN TE MT UTRAN SGSN GGSN TE Gn Ga Gb Ga Gp TE MT BSS Gn Billing R Um CGF System GGSN Gf SGSN EIR Other PLMN SGSN SUT TTCN3 simulated interface TTCN3 simulated nodes

  5. SGSN test configuration Gb stack Gb API SGSN LLC Gb LLC TP TTCN-3 compiled modules BSSGP NS NS TP FR E1 TCAP TP SS7 TCAP TP TCAP functions in C++ (e.g. enc/dec) SCCP SCCP TP IuC/Gr/Ge Gd/Ge MTP3 SCCP TP L2 SS7 API E1 or ATM TTCN-3 RTE I/f hardware IuU/Gn/Gp UDP TP (Gch, modified Ga) TTCN-3 TCP TP UNIX WS Unix socket

  6. Testflow TTCN Passed Test Cases- new functionality FT Functional Test PTBPre-Test of Build (Regression) Delivery ST System Test Achieved capacity, Stability… FOA ARS NIV UCD/NFD SV Analyze SI SV System Verification SI System Integration MIT Modelling MT Coding - Review

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