Academinc Staff


Picture of Murat Gürsu

Murat Gürsu, M.Sc.

Chair of Communication Networks (Prof. Kellerer)

Postal address

Postal:
Arcisstr. 21
80333 München

  • murat.guersu(at)tum.de

Biography

Murat Gürsu received his Bachelor and Master degrees from Bogazici University and Technische Universität München in Electrical & Electronics Engineering and Communication Engineering in 2012 and 2014 respectively. He joined the Institute for Communication Networks as a member of research and teaching staff in March 2015.

Research

TL;DR

  • Wireless Sensor Networks
  • Machine to Machine Communication
  • Reliability through Medium Access Control

A story of Wireless Resource Management: Modeling, Optimization, Implementation

Wireless Sensor Networks are using the ISM band in order to avoid any additional licensing fees. However, ISM band using equipments are already deployed heavily especially in terms of Local Area Networks with WiFi. There are multiple ways to combat this co-existence problem, such as blacklisting channels that are used by other technologies or hopping through multiple channels to escape this problem through Frequency Hopping Spread Spectrum (FHSS).

 

Modelling

 

 

Who should speak first?, is the ultimate question of the MAC research. Contention based access approaches find the answer by saying that anyone that has anything to say should stand up and say it, while the scheduled access is defending that one should allocate speech slots for every opinion holder and distribute them beforehand. Between the never ending discussion of both sides lies the Tree Algorithms where each users speaks as he wishes and in case of multiple speakers at the same time, the contention is resolved via a tree algorithm guaranteeing that everyone will get a specific slot to explain himself.

 

It is discussed heavily for sensor networks that the scheduled access is a waste of resource due to the unpredictable behavior. However, contention based access lacks the reliability that is required by the most critical applications. At this point we foresee that Tree Algorithms will provide an optimum trade-off in such a scenario. Our current research interest is adapting the Tree Algorithms to provide guarantees on top of random access. If you are interested in investigating the Tree Algorithms mathematically (improving the stochastic models) please contact murat.guersu@tum.de.

 

Optimization

 

 

Entertainment is already provided through wireless in aircraft. This is enabled via there WiFi access points in a small aircraft. These three access points use three non-overlapping WiFi channels, this creates a blocking in most of the ISM band. In our previous work we have investigated the reliability by deploying our sensors in such a scenario. Our further work is to extract the channel characteristics for smarter wireless resource allocation in order to guarantee reliability. If you are interested in improving reliability of the sensors through resource allocation optimization please contact murat.guersu@tum.de

 

Implementation

 

 

We have multiple (around 50) of (Zolertia) sensor boards that come with a PHY layer chip of IEEE 802.15.4 and a microprocessor.  We are currently deploying OpenWSN on our sensor that is the de-facto IoT standard. We are modifying the MAC scheme in order to investigate possible improvements for our use-case. Current research interest is in implementation of ultra-low latency MAC of LLDN and a dynamic scheduler. If you are interested in deploying sensors with your code running inside please contact murat.guersu@tum.de.