Performance Analysis of Telecommunication Systems

Wim Torfs

Contact information

• G3.19 - Building G
• Dept. of Mathematics and Computer Science
• Middelheimlaan 1
• B-2020 Antwerpen
• Belgium

• wim.torfs@ua.ac.be
• +32 3 265 38 53
• +32 3 264 37 77

2011

• Analysis of TDMA scheduling by means of Egyptian Fractions for real-time WSNs
  Wim Torfs & Chris Blondia
  EURASIP Journal on Wireless Communications and Networking 2011, 2011.
  BibTeX | Abstract | PDF Available
  
  Bibtex:
  @INPROCEEDINGS{
  author = {Wim Torfs and Chris Blondia},
  title = {Analysis of TDMA scheduling by means of Egyptian Fractions for real-time WSNs},
  booktitle = {EURASIP Journal on Wireless Communications and Networking 2011},
  year = {2011},
  month = {JUL},
  url = {content/publications/2011/wtorfs_blondia_1687-1499-2011-37.pdf},
  abstract = {In Wireless Sensor Networks (WSNs), Time Division Multiple Access (TDMA) is a well-studied subject. TDMA has, however, the reputation of being a rigid access method and many TDMA protocols have issues regarding the entering or leaving of sensors or have a predetermined upper limit on the number of nodes in the network. In this article, we present a flexible TDMA access method for passive sensors, that is, sensors that are constant bitrate sources. The presented protocol poses no bounds on the number of nodes, yet provides a stable framing that ensures proper operation, while it fosters that every sensor gets its data on time at the sink and this in a fair fashion. Even more, the latency of the transmission is deterministic and thereby enabling real-time communication. The protocol is developed, keeping in mind the practical limitations of actual hardware, limiting the memory usage and the communication overhead. The schedule that determines when a sensor can send can be encoded in a very small footprint and needs to be sent only once. As soon as the sensor has received its schedule, it can calculate for the rest of its lifetime when it is allowed to send.}
  }
  
  Abstract:
  In Wireless Sensor Networks (WSNs), Time Division Multiple Access (TDMA) is a well-studied subject. TDMA has, however, the reputation of being a rigid access method and many TDMA protocols have issues regarding the entering or leaving of sensors or have a predetermined upper limit on the number of nodes in the network. In this article, we present a flexible TDMA access method for passive sensors, that is, sensors that are constant bitrate sources. The presented protocol poses no bounds on the number of nodes, yet provides a stable framing that ensures proper operation, while it fosters that every sensor gets its data on time at the sink and this in a fair fashion. Even more, the latency of the transmission is deterministic and thereby enabling real-time communication. The protocol is developed, keeping in mind the practical limitations of actual hardware, limiting the memory usage and the communication overhead. The schedule that determines when a sensor can send can be encoded in a very small footprint and needs to be sent only once. As soon as the sensor has received its schedule, it can calculate for the rest of its lifetime when it is allowed to send.

2010

• Binary TDMA Schedule by Means of Egyptian Fractions for Real-time WSNs on TMotes
  Wim Torfs & Chris Blondia
  Proceedings of Med-Hoc-Net 2010, Juan-les-Pins, France, 2010.
  BibTeX | Abstract | PDF Available
  
  Bibtex:
  @INPROCEEDINGS{
  author = {Wim Torfs and Chris Blondia},
  title = {Binary TDMA Schedule by Means of Egyptian Fractions for Real-time WSNs on TMotes},
  booktitle = {Proceedings of Med-Hoc-Net 2010},
  year = {2010},
  month = {JUN},
  location = {Juan-les-Pins, France},
  url = {content/publications/2010/wtorfs_medhocnet_2010.pdf},
  abstract = {In Wireless Sensor Networks (WSNs), the user
  should not be bothered with configuring the network, depending
  on the kind of sensors that he/she is using. It should only be a
  matter of deploying the sensors and they should do the necessary
  effort to construct a network. Since most of these networks use
  low power devices, the energy consumption is vital. The most
  suited medium access method in order to waste as few energy as
  possible, is Time Division Multiple Access (TDMA). TDMA has
  however the reputation of being a rigid access method. In this
  paper, we present a TDMA access method for passive sensors,
  i.e. sensors are constant bitrate sources. The presented protocol
  does not only take into account the energy, but it also ensures
  that every sensor gets its data on time at the sink and this
  in a fair fashion. Even more, the latency of the transmission
  is deterministic. We could say that real-time communication is
  possible. The protocol is developed keeping in mind the practical
  limitations of actual hardware by limiting the memory usage
  and the communication overhead. The schedule that determines
  which sensor can send when, which can be encoded in a very
  small footprint, and needs to be sent only once. To prove our
  statement, we implemented our scheduling protocol on TMotes.}
  }
  
  Abstract:
  In Wireless Sensor Networks (WSNs), the user not be bothered with configuring the network, depending the kind of sensors that he/she is using. It should only be a of deploying the sensors and they should do the necessary to construct a network. Since most of these networks use power devices, the energy consumption is vital. The most medium access method in order to waste as few energy as is Time Division Multiple Access (TDMA). TDMA has the reputation of being a rigid access method. In this we present a TDMA access method for passive sensors, sensors are constant bitrate sources. The presented protocol not only take into account the energy, but it also ensures every sensor gets its data on time at the sink and this a fair fashion. Even more, the latency of the transmission deterministic. We could say that real-time communication is The protocol is developed keeping in mind the practical of actual hardware by limiting the memory usage the communication overhead. The schedule that determines sensor can send when, which can be encoded in a very footprint, and needs to be sent only once. To prove our we implemented our scheduling protocol on TMotes.

2009

• WBAN implementation on Magnetic Induction Radio IC for medical remote monitoring
  Wim Torfs, Peter De Cleyn & Chris Blondia
  Accepted at the 1st International Workshop on Medical Applications Networking, Dresden, Germany, 2009.
  BibTeX | Abstract | PDF Available
  
  Bibtex:
  @INPROCEEDINGS{im309,
  author = {Wim Torfs, Peter De Cleyn and Chris Blondia},
  title = {WBAN implementation on Magnetic Induction Radio IC for medical remote monitoring},
  booktitle = {Accepted at the 1st International Workshop on Medical Applications Networking},
  year = {2009},
  month = {JUN},
  location = {Dresden, Germany},
  url = {content/publications/2009/im3_impl_man_2009.pdf},
  abstract = {The medical service environment is changing. There is a need for automatization of collecting medical data remotely from the patient. Telecare is the continuous remote monitoring of the health of the patient. The IM3 (Interactive Mobile Medical Monitoring) project focuses on developing and implementing such end-to-end service. We implemented the WBAN (Wireless Body Area Network) protocol on the Magnetic Induction Radio IC (Integrated Circuit), which is designed by NXP Semiconductors. We show in this paper that we have a working setup, where nodes form autonomously the network and send ECG data to the sink.},
  }
  
  Abstract:
  The medical service environment is changing. There is a need for automatization of collecting medical data remotely from the patient. Telecare is the continuous remote monitoring of the health of the patient. The IM3 (Interactive Mobile Medical Monitoring) project focuses on developing and implementing such end-to-end service. We implemented the WBAN (Wireless Body Area Network) protocol on the Magnetic Induction Radio IC (Integrated Circuit), which is designed by NXP Semiconductors. We show in this paper that we have a working setup, where nodes form autonomously the network and send ECG data to the sink.,

2008

• SCTP as mobility protocol for enhancing Internet on the train
  Daan Pareit, Ingrid Moerman, Piet Demeester, Wim Torfs, Peter De Cleyn & Chris Blondia
  Proceedings of the 8th International Conference on ITS Telecommunications, Hilton Phuket, Thailand, 2008.
  BibTeX | Abstract | PDF Available
  
  Bibtex:
  @INPROCEEDINGS{trains08,
  author = {Daan Pareit, Ingrid Moerman, Piet Demeester, Wim Torfs, Peter De Cleyn and Chris Blondia},
  title = {SCTP as mobility protocol for enhancing
  Internet on the train},
  booktitle = {Proceedings of the 8th International Conference on ITS Telecommunications},
  year = {2008},
  month = {OKT},
  location = {Hilton Phuket, Thailand},
  url = {content/publications/2008/wtorfs_ITST2008.pdf},
  abstract = {Internet-on-the-train is a rising concept in the last few years. Several trials in different countries have proved the feasibility of offering Internet access to train commuters, but none of them combines broadband access, scalability, seamless handover and quality of service guarantees in one solution. In this paper, we look at the features of SCTP and its extensions which could overcome these shortcomings and which were successfully demonstrated.},
  }
  
  Abstract:
  Internet-on-the-train is a rising concept in the last few years. Several trials in different countries have proved the feasibility of offering Internet access to train commuters, but none of them combines broadband access, scalability, seamless handover and quality of service guarantees in one solution. In this paper, we look at the features of SCTP and its extensions which could overcome these shortcomings and which were successfully demonstrated.,

• QoS support for a MAC with a TDMA tree topology on the Magnetic Induction Radio IC
  Wim Torfs & Chris Blondia
  Proceedings of 29th Real-Time Systems Symposium (RTSS 2008), Barcelona, Spain, 2008.
  BibTeX | Abstract | PDF Available
  
  Bibtex:
  @INPROCEEDINGS{wtorfs08RTSS,
  author = {Wim Torfs and Chris Blondia},
  title = {QoS support for a MAC with a TDMA tree
  topology on the Magnetic Induction Radio IC},
  booktitle = {Proceedings of 29th Real-Time Systems Symposium (RTSS'2008) },
  year = {2008},
  location = {Barcelona, Spain},
  url = {content/publications/2008/wtorfs_rtss_wip2008.pdf},
  abstract = {In our previous work, we implemented a TDMA tree
  based protocol on the Magnetic Induction Radio IC. The protocol was designed for Body Area Networks (BANs). The result was a protocol that worked for that specific situation, but could not be extended to other applications. The protocol needed some mechanism that would provide extra flexibility to the network. In this work, we add QoS to the protocol, which results in the protocol that can be used in several kinds of applications. The resulting protocol has the capability to be configured at runtime for the kind of sensors that are being used, in order to optimize the throughput and efficiency.}
  }
  
  Abstract:
  In our previous work, we implemented a TDMA tree protocol on the Magnetic Induction Radio IC. The protocol was designed for Body Area Networks (BANs). The result was a protocol that worked for that specific situation, but could not be extended to other applications. The protocol needed some mechanism that would provide extra flexibility to the network. In this work, we add QoS to the protocol, which results in the protocol that can be used in several kinds of applications. The resulting protocol has the capability to be configured at runtime for the kind of sensors that are being used, in order to optimize the throughput and efficiency.

2007

• QoS-enabled internet-on-train network architecture: interworking by MMP-SCTP versus MIP
  Daan Pareit, Nele Gheysens, Tom Van Leeuwen, Ingrid Moerman, Walter Van Brussel, Ines Clenjans, Wim Torfs, Peter De Cleyn & Chris Blondia
  Accepted at the 7th International Conference on ITS Telecommunications, Sophia Antipolis,France, 2007.
  BibTeX | Abstract | PDF Available
  
  Bibtex:
  @INPROCEEDINGS{torfsdecleyn07,
  author = {Daan Pareit, Nele Gheysens, Tom Van Leeuwen, Ingrid Moerman, Walter Van Brussel, Ines Clenjans, Wim Torfs, Peter De Cleyn and Chris Blondia},
  title = {QoS-enabled internet-on-train network architecture: interworking by MMP-SCTP versus MIP},
  booktitle = {Accepted at the 7th International Conference on ITS Telecommunications},
  year = {2007},
  month = {JUL},
  location = {Sophia Antipolis,France},
  URL = {content/publications/2007/sctpvsmip.pdf},
  abstract = {Internet-on-the-train is a rising concept in the last few years. Several trials in different countries have proved the feasibility of offering Internet access to train commuters, but none of them combines broadband access, scalability, seamless handover and quality of service guarantees in one solution. In this paper, we propose a new architecture to satisfy these needs. Using real handover measurement data of several common broadband wireless technologies, we compare two possible inter-working mobility solutions: Mobile Multi-Path SCTP (MMP-SCTP) and Mobile IP (MIP). },
  }
  
  Abstract:
  Internet-on-the-train is a rising concept in the last few years. Several trials in different countries have proved the feasibility of offering Internet access to train commuters, but none of them combines broadband access, scalability, seamless handover and quality of service guarantees in one solution. In this paper, we propose a new architecture to satisfy these needs. Using real handover measurement data of several common broadband wireless technologies, we compare two possible inter-working mobility solutions: Mobile Multi-Path SCTP (MMP-SCTP) and Mobile IP (MIP). ,