PhD Researcher
Sandra Zimmermann studied information systems engineering in Dresden from 2012 to 2019 specializing in computer networks (from radio protocols to web security). As a student helper she started working on information-centric networking. After graduation she joined CeTI as PhD student. There she is working on distributed protocols, especially distributed storage solutions.
Phone: +49 351 463-40775 Email: sandra.zimmermann@tu-dresden.de
Zimmermann, Sandra; Schwenteck, Paul; Cabrera, Juan A.; Nguyen, Giang T.; Fitzek, Frank H. P.
Grade to the Edge: How Many Unreliable Nodes Does It Take to Break a Content Delivery Network? Inproceedings
In: 2022 IEEE 23rd International Symposium on a World of Wireless, Mobile and Multimedia Networks (WoWMoM) (WoWMoM 2022), Belfast, United Kingdom (Great Britain), 2022.
Abstract | BibTeX
@inproceedings{Zimm2206:Grade, title = {Grade to the Edge: How Many Unreliable Nodes Does It Take to Break a Content Delivery Network?}, author = {Sandra {Zimmermann} and Paul {Schwenteck} and Juan A. {Cabrera} and Giang T. {Nguyen} and Frank H. P. {Fitzek}}, year = {2022}, date = {2022-06-14}, urldate = {2022-06-14}, booktitle = {2022 IEEE 23rd International Symposium on a World of Wireless, Mobile and Multimedia Networks (WoWMoM) (WoWMoM 2022)}, address = {Belfast, United Kingdom (Great Britain)}, abstract = {Delivering content from a network via a client-server architecture is expensive not only for content owners but also for network operators. Moving content closer to the end user is already used in Content Delivery Networks (CDN). Mobile Edge Cloud (MEC) enables us to shift the content even closer by using the storage of end users. But, due to the large media files, storage and transport costs for peers increase significantly. Network Coding can reduce these costs. However, peers in CDNs tend to be highly fluctuating and often need to be restored, making continuous availability of data at the network edge a problem. While for uncoded data, individual packets lost due to peer failures can be tracked to determine availability, the availability of coded data is currently distinguished only in two cases: either there are still enough linearly independent packets to decode the file, or there are not. However, we have found that the network's combined coded cache loses quality over time due to recovery. This quality loss, which we refer to as grade, can be measured by very cost-effective monitoring. If the grade falls below a certain limit, we can intervene in the network by performing a cache refresh to prevent data becoming unavailable preemptively. In this paper, we present the cases in which such monitoring is useful, how the grade is calculated, and when a cache refresh is necessary. The results show that we can reduce network traffic by up to 34 % with minimal storage costs through efficient monitoring.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} }
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Zimmermann, Sandra; Schwenteck, Paul; Vielhaus, Christian Leonard; Cabrera, Juan A.; Fitzek, Frank H. P.
Immortal Under the Edge of a Knife: Self-Healing Distributed Services on MANET Partitioning Inproceedings
In: 2022 IEEE Latin-American Conference on Communications (LATINCOM), 2022, (accepted for publication).
BibTeX
@inproceedings{227098, title = {Immortal Under the Edge of a Knife: Self-Healing Distributed Services on MANET Partitioning}, author = {Sandra {Zimmermann} and Paul {Schwenteck} and Christian Leonard {Vielhaus} and Juan A. {Cabrera} and Frank H. P. {Fitzek}}, year = {2022}, date = {2022-01-01}, urldate = {2022-01-01}, booktitle = {2022 IEEE Latin-American Conference on Communications (LATINCOM)}, note = {accepted for publication}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} }
Cabrera, Juan A.; Fitzek, Frank H. P.; Hanisch, Simon; Itting, Sebastian A. W.; Zhang, Jiajing; Zimmermann, Sandra; Strufe, Thorsten; Simsek, Meryem; Fetzer, Christof W.
Intelligent networks Book Chapter
In: Fitzek, Frank H. P.; Li, Shu-Chen; Speidel, Stefanie; Strufe, Thorsten; Simsek, Meryem; Reisslein, Martin (Ed.): Tactile Internet with Human-in-the-Loop, Chapter 6, pp. 135-154, Academic Press, 2021, (later on under: https://ceti.one/book).
@inbook{CeTIBook-2020-Chap06, title = {Intelligent networks}, author = {Juan A. {Cabrera} and Frank H. P. {Fitzek} and Simon {Hanisch} and Sebastian A. W. {Itting} and Jiajing {Zhang} and Sandra {Zimmermann} and Thorsten {Strufe} and Meryem {Simsek} and Christof W. {Fetzer}}, editor = {Frank H. P. {Fitzek} and Shu-Chen {Li} and Stefanie {Speidel} and Thorsten {Strufe} and Meryem {Simsek} and Martin {Reisslein}}, year = {2021}, date = {2021-01-01}, urldate = {2021-01-01}, booktitle = {Tactile Internet with Human-in-the-Loop}, pages = {135-154}, publisher = {Academic Press}, chapter = {6}, note = {later on under: https://ceti.one/book}, keywords = {}, pubstate = {published}, tppubtype = {inbook} }
Zimmermann, Sandra; Rischke, Justus; Cabrera, Juan A.; Fitzek, Frank H. P.
Journey to MARS: Interplanetary Coding for relieving CDNs Inproceedings
In: 2020 IEEE Global Communications Conference: Selected Areas in Communications: Cloud & Fog/Edge Computing, Networking and Storage (Globecom2020 SAC CCNS), Taipei, Taiwan, 2020.
@inproceedings{Zimm2012:Journey, title = {Journey to MARS: Interplanetary Coding for relieving CDNs}, author = {Sandra {Zimmermann} and Justus {Rischke} and Juan A. {Cabrera} and Frank H. P. {Fitzek}}, year = {2020}, date = {2020-12-07}, urldate = {2020-12-07}, booktitle = {2020 IEEE Global Communications Conference: Selected Areas in Communications: Cloud \& Fog/Edge Computing, Networking and Storage (Globecom2020 SAC CCNS)}, address = {Taipei, Taiwan}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} }
Grohmann, Andreas I.; Gabriel, Frank; Zimmermann, Sandra; Fitzek, Frank H. P.
SourceShift: Resilient Routing in Highly Dynamic Wireless Mesh Networks Inproceedings
In: 2020 IEEE Wireless Communications and Networking Conference (WCNC) (IEEE WCNC 2020), Seoul, Korea (South), 2020.
@inproceedings{Grohmann2020, title = {SourceShift: Resilient Routing in Highly Dynamic Wireless Mesh Networks}, author = {Andreas I. {Grohmann} and Frank {Gabriel} and Sandra {Zimmermann} and Frank H. P. {Fitzek}}, year = {2020}, date = {2020-04-05}, booktitle = {2020 IEEE Wireless Communications and Networking Conference (WCNC) (IEEE WCNC 2020)}, address = {Seoul, Korea (South)}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} }
Salah, Hani; Zimmermann, Sandra; Cabrera, Juan A.
Content Distribution Book Chapter
In: Fitzek, Frank H. P.; Granelli, Fabrizio; Seeling, Patrick (Ed.): Computing in Communication Networks – From Theory to Practice, vol. 1, Chapter 5, pp. 99-110, Elsevier, 1, 2020, (https://cn.ifn.et.tu-dresden.de/compcombook/).
@inbook{CompBookChap05, title = {Content Distribution}, author = {Hani {Salah} and Sandra {Zimmermann} and Juan A. {Cabrera}}, editor = {Frank H. P. {Fitzek} and Fabrizio {Granelli} and Patrick {Seeling}}, year = {2020}, date = {2020-01-01}, urldate = {2020-01-01}, booktitle = {Computing in Communication Networks \textendash From Theory to Practice}, volume = {1}, pages = {99-110}, publisher = {Elsevier}, edition = {1}, chapter = {5}, series = {1}, note = {https://cn.ifn.et.tu-dresden.de/compcombook/}, keywords = {}, pubstate = {published}, tppubtype = {inbook} }