Towards efficient legacy test evaluations at Ericsson AB, Linköping (Computer Project)

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3Gsim is a load generator for traffic simulation in a WCDMA (Wideband Code Division Multiple Access) network. It is developed at Ericsson AB in Linköping. Tests are run daily and the results are evaluated by testers.

When errors or abnormalities are found, the testers write trouble reports and the described problems are handed over to designers whose task is to fix them.In order to save time, Ericsson wished to improve the efficiency.

This study has focused on a specific part of the process of the development of 3Gsim, namely the process of evaluating test results. The goal has been to investigate if and how the process of evaluating 3Gsim test results can be made more efficient. The daily work of the testers has been studied at close hand by the author.The testers answered a questionnaire with questions about their work and their opinions about the tools being used.

The answers were evaluated and focus was laid on the main problems.It was found that a lot of time is wasted on searching for trouble reports.A big part of the test result evaluation process consists of going through summary logs with error print-outs. Unfortunately no mapping between error print-outs and trouble reports is performed. When going through the summary logs the testers have to determine which errors have already been reported and which ones that haven’t. Another major problem is the fact that most tests fail.

On the webpage where the test results are displayed,this is indicated by a coloured field showing red. This is believed to have a negative effect on the work attitude.A lot of time can be saved by mapping error print-outs to trouble reports and automatically comparing new error print-outs with old ones. The mapping will also help preventing the creation of duplicated trouble reports.

This solution will have the greatest impact on the improvement of the efficiency.Another way to enhance the efficiency is to develop a more advanced colour coding scheme than the one used today. This coding scheme will help the testers making the right priorities when processing the test results.

Furthermore,these two solutions will have a positive effect on the work attitude. A prototype implementing the first solution has been created. This prototype gives Ericsson AB the possibility to test the solution idea in practice.
Source: Linköping University
Author: Sterneberg, Karl Gustav

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