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Andreas Weigel

Foto von Andreas Weigel
Dr-Ing. Andreas Weigel
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Im August 2010 habe ich mein Master-Studium "Information and Communication Systems" an der TU Hamburg-Harburg abgeschlossen. Seit September 2010 bin ich als Doktorand am Institut für Telematik tätig.

Projekte

Publikationen

Andreas Weigel. Forwarding Strategies for 6LoWPAN-Fragmented IPv6 Datagrams. PhD Thesis, Hamburg University of Technology, Hamburg, Germany, 2017.
@PhdThesis{Telematik_Weigel_2017_Diss, author = {Andreas Weigel}, title = {Forwarding Strategies for 6LoWPAN-Fragmented IPv6 Datagrams}, publisher = {Cuvillier Verlag, Göttingen, Germany}, school = {Hamburg University of Technology}, address = {Hamburg, Germany}, year = 2017, isbn = {978-3-7369-9667-0}, }
Abstract: This dissertation explores different implementation strategies for the fragment-forwarding aspect of the 6LoWPAN protocol for “low power and lossy networks” (LLNs). The performance in terms of latency and reliability for the LLN-typical collection traffic pattern is analyzed for several “direct” and “reassembling” strategies. A novel approach based on snooping and suspending transmissions is developed and it is shown that this approach improves the end-to-reliability significantly in most of the evaluated simulation and testbed scenarios.
Andreas Weigel und Volker Turau. Hardware-Assisted IEEE 802.15.4 Transmissions and Why to Avoid Them. In Conference proceedings of the 8th International Conference on Internet and Distributed Computer Systems, IDCS 2015, September 2015, pp. 223–234. Windsor, UK.
@InProceedings{Telematik_IDCS_2015_6LoWPAN, author = {Andreas Weigel and Volker Turau}, title = {Hardware-Assisted IEEE 802.15.4 Transmissions and Why to Avoid Them}, booktitle = {Conference proceedings of the 8th International Conference on Internet and Distributed Computer Systems, IDCS 2015}, pages = {223-234}, day = {2-4}, month = sep, year = 2015, location = {Windsor, UK}, }
Abstract: 6LoWPAN’s fragmentation mechanism enables transport of IPv6 datagrams with the required minimum MTU of 1280 bytes over IEEE 802.15.4-based networks. Testbed experiments showed disastrously bad datagram success rates for a collection traffic scenario with large, 6LoWPAN-fragmented datagrams, which significantly differed from the simulation results for a comparable scenario. In this paper we present an experimental setup that enables capturing the MAC and transceiver states of participating nodes in realtime. The results of our experiments show, that for the given fragmentation/collection scenario, the usage of the extended operating mode of the transceiver hardware, which provides CSMA/CA, ACKs and retransmissions in hardware, is responsible for nearly all datagram losses. Therefore, we strongly advise against using such hardware-assisted modes of operation in similar traffic scenarios.
Andreas Weigel, Martin Ringwelski, Volker Turau und Andreas Timm-Giel. Route-over forwarding techniques in a 6LoWPAN. EAI Endorsed Transactions on Mobile Communications and Applications, 14(5), Dezember 2014.
@Article{Telematik_EAI_6LowPAN_2014, author = {Andreas Weigel and Martin Ringwelski and Volker Turau and Andreas Timm-Giel}, title = {Route-over forwarding techniques in a 6LoWPAN}, journal = {EAI Endorsed Transactions on Mobile Communications and Applications}, volume = {14}, number = {5}, month = dec, year = 2014, }
Abstract: 6LoWPAN plays a major role within the protocol stack for the future Internet of Things. Its fragmentation mechanism enables transport of IPv6 datagrams with the required minimum MTU of 1280 bytes over 802.15.4-based networks. With the goal of a fully standardized WSN protocol stack currently necessitating a route-over approach, i.e., routing at the IP-layer, there are two main choices for any 6LoWPAN implementation with regard to datagram fragmentation: Hop-by-hop assembly or a cross-layered direct mode, which forwards individual 6LoWPAN fragments before the whole datagram has arrived. In addition to these two straightforward approaches, we propose enhancements based on adaptive rate-restriction for the direct forwarding and a retry control for both modes to reduce the number of losses of larger datagrams. An evaluation of these modes in a simulation environment and a hardware testbed indicate that the proposed enhancements can considerably improve PRR and latency within 6LoWPAN networks.

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