01.11.2015 – From May to August 2015, Shuqing Chen from the Rice University in Houston completed a research internship at the Communication Networks Institute. Her research topic was the simulative analysis of the trade-off between resource efficiency and fairness among users in highly dynamic Long Term Evolution (LTE) networks. Her research topic is related to the projects A4 and B4 of SFB 876. Her approach was to assign users with bad channel conditions a higher transmission priority than users with good channel conditions in order to provide a reliable communication infrastructure to all users of a LTE cell. She realized the different priorities by using Quality of Service Class Indicators (QCI) which is proposed in the LTE standard. Using the CNI simulation cluster, Shuqing Chen implemented the QCI mechanisms in the Open-Source software platform LTE-Sim. In addition to this, performed various studies that show that her approach reaches a higher level reliability especially for users which suffer from bad channel conditions (e.g. if they are located at the cell edge).
The attendee in 2015:
Shuqing Chen (Rice University, Houston)
Optimizing LTE Networks for Reliable Communication under Harsh Channel Conditions
01.06.2013 – From July 2013 to September 2013 Ren-Huang Liu completed a research internship at the Communication Networks Institute. His research topic was Voice over LTE in vehicular environments (related to project B4 of SFB 876). Using the CNI lab equipment (LTE base station emulator and channel emulator), he performed measurements of the delay and the packet error rate which enables the calculation of user velocity dependent voice quality (Mean Opinion Score (MOS)). The study shows that LTE can provide acceptable VoIP quality in high-speed scenarios. In addition, guidelines for the network operators to select the appropriate parameter values when deploying their VoIP services in LTE were provided. The results are summarized in a paper together with Christian Wietfeld, Christoph Ide and Björn Dusza.
The attendee in 2013:
Ren-Huang Liou (National Chiao Tung University, Taiwan)
QoE-Aware LTE Radio Link Control Parameters for Voice over IP in Vehicular Environments
01.06.2012 – In 2012 the Communication Networks Institute participated in the RISE summer internship program once again. This year we got 13 candidacies as responce to our offer. Tyler Manning Dahan from McGill University (Montreal) got the internship this year. Regarding the challenge "Pushing Smart Phones to longer lifetimes" Tyler made power measurements of different smart phones in our laboratory. Using a sophisticated power meter together with a base station emulator and a Wifi access point, he analysed the validity of the analytical model derived in last years RISE program. This way we were able to identify different power modes of smart phones and can derive appropriate analytical models.
The attendee in 2012:
Tyler Manning Dahan - McGill University, Montreal (Canada)
Power Measerments of Different Smart Phones in the Laboratory
01.06.2011 – The Communication Networks Institute participated in the RISE summer internship program for the third year in a row. Brian Dolhansky from the US got the internship out of 15 candidates in 2011 and worked within the research project "Providing Information by Resource-Constrained Analysis" which is funded by the "Deutsche Forschungsgemeinschaft". As smart phones are getting more and more power hungry, he developed an Android application capturing the real-time power consumption of the CPU, LCD, WiFi and 3G module.
The attendee in 2011:
Brian Dolhansky - Drexel University, Philadelphia (US)
Android Application: On-line power estimation of smartphones
01.06.2010 – In 2010 the Communication Networks Institute participated in international student exchange programs: The Research Internships in Science and Engineering (RISE) and the International Association for the Exchange of Students for Technical Experience (IAESTE), both funded by the German Academic Exchange Service (DAAD). Seven students from the US, the UK, Tunisia, India and Spain got the internship and attended the department during the course of summer 2010.
01.06.2009 – The Communication Networks Institute participated in the Research Internships in Science and Engineering (RISE) program in 2009. RISE is an internship program initiated and funded by the German Academic Exchange Service (DAAD) offered to students from the US and UK. Two students from the US and another two students from the UK got the internship and attended the department during the course of summer 2009. Here are some impressions from this year’s RISE program at CNI and the RISE project outlines.