1. Communication Networks Institute, TU Dortmund University,Dortmund,Germany,44227
2. TU Dortmund University,Department of Computer Science,Dortmund,Germany,44227
3. Fraunhofer Institute for Material Flow and Logistics,Dortmund,Germany,44227
4. Chair of Material Handling and Warehousing, TU Dortmund University,Dortmund,Germany,44227