7 research outputs found
Network coding for reliable wireless sensor networks
Wireless sensor networks are used in many applications and are now a key element
in the increasingly growing Internet of Things. These networks are composed of
small nodes including wireless communication modules, and in most of the cases
are able to autonomously con gure themselves into networks, to ensure sensed data
delivery. As more and more sensor nodes and networks join the Internet of Things,
collaboration between geographically distributed systems are expected. Peer to peer
overlay networks can assist in the federation of these systems, for them to collaborate.
Since participating peers/proxies contribute to storage and processing, there is no
burden on speci c servers and bandwidth bottlenecks are avoided.
Network coding can be used to improve the performance of wireless sensor networks.
The idea is for data from multiple links to be combined at intermediate encoding
nodes, before further transmission. This technique proved to have a lot of potential
in a wide range of applications. In the particular case of sensor networks, network
coding based protocols and algorithms try to achieve a balance between low packet
error rate and energy consumption. For network coding based constrained networks
to be federated using peer to peer overlays, it is necessary to enable the storage
of encoding vectors and coded data by such distributed storage systems. Packets
can arrive to the overlay through any gateway/proxy (peers in the overlay), and lost
packets can be recovered by the overlay (or client) using original and coded data that
has been stored. The decoding process requires a decoding service at the overlay
network. Such architecture, which is the focus of this thesis, will allow constrained
networks to reduce packet error rate in an energy e cient way, while bene ting from an e ective distributed storage solution for their federation. This will serve as
a basis for the proposal of mathematical models and algorithms that determine the
most e ective routing trees, for packet forwarding toward sink/gateway nodes, and
best amount and placement of encoding nodes.As redes de sensores sem fios são usadas em muitas aplicações e são hoje consideradas um elemento-chave para o desenvolvimento da Internet das Coisas. Compostas por nós de pequena dimensão que incorporam módulos de comunicação sem fios, grande parte destas redes possuem a capacidade de se configurarem de forma autónoma, formando sistemas em rede para garantir a entrega dos dados recolhidos. (…
Data storage solutions for the federation of sensor networks
In the near future, most of our everyday devices will be accessible via some
network and uniquely identified for interconnection over the Internet. This
new paradigm, called Internet of Things (IoT), is already starting to influence
our society and is now driving developments in many areas.
There will be thousands, or even millions, of constrained devices that will
be connected using standard protocols, such as Constrained Application Protocol
(CoAP), that have been developed under certain specifications appropriate
for this type of devices. In addition, there will be a need to interconnect
networks of constrained devices in a reliable and scalable way, and federations
of sensor networks using the Internet as a medium will be formed.
To make the federation of geographically distributed CoAP based sensor
networks possible, a CoAP Usage for REsource LOcation And Discovery (RELOAD)
was recently proposed. RELOAD is a peer-to-peer (P2P) protocol that
ensures an abstract storage and messaging service to its clients, and it relies
on a set of cooperating peers that form a P2P overlay network for this purpose.
This protocol allows to define so-called Usages for applications to work
on top of this overlay network. The CoAP Usage for RELOAD is, therefore,
a way for CoAP based devices to store their resources in a distributed P2P
overlay. Although CoAP Usage for RELOAD is an important step towards
the federation of sensor networks, in the particular case of IoT there will be
consistency and efficiency problems. This happens because the resources of
CoAP devices/Things can be in multiple data objects stored at the overlay network,
called P2P resources. Thus, Thing resource updates can end up being
consuming, as multiple P2P resources will have to be modified. Mechanisms
to ensure consistency become, therefore, necessary.
This thesis contributes to advances in the federation of sensor networks by
proposing mechanisms for RELOAD/CoAP architectures that will allow consistency
to be ensured. An overlay network service, required for such mechanisms
to operate, is also proposed.Num futuro próximo, a maioria dos nossos dispositivos do dia-a-dia estarão
acessíveis através de uma rede e serão identificados de forma única para
poderem interligar-se através da Internet. Este novo paradigma, conhecido
hoje por Internet das Coisas (IoT), já está a começar a influenciar a nossa
sociedade e está agora a impulsionar desenvolvimentos em inúmeras áreas.
Teremos milhares, ou mesmo milhões, de dispositivos restritos que utilizarão protocolos padrão que foram desenvolvidos de forma a cumprir determinadas
especificações associadas a este tipo de dispositivos, especificações essas
que têm a ver com o facto destes dispositivos terem normalmente restrições
de memória, pouca capacidade de processamento e muitos possuirem limitações
energéticas. Surgirá ainda a necessidade de interligar, de forma fiável e
escalonável, redes de dispositivos restritos.(…
Analysis of relod.net, a basic implementation of the RELOAD protocol for peer-to-peer networks
Actas de: XI Jornadas de Ingeniería Telemática (JITEL 2013) celebradas en Granada, 28-30 Octubre 2013.
La web del evento es: http://dtstc.ugr.es/jitel2013/#The P2PSIP Working Group is chartered to develop protocols and mechanisms for the use of SIP in distributed environments, thus minimizing the need for centralized servers. Under this premise, the RELOAD protocol was created, whose design was generalized to accept other applications with similar requirements, and which is currently in process of standardization by the IETF. In this paper, we present a basic implementation and an analysis of this protocol proposed standard, given the great interest displayed in recent years by the scientific and business community in issues related to peerto- peer networks. Later, we conduct several experiments in order to validate its correct operation in real scenarios and provide feedback in relation with the current specificationThis research was supported in part by the Comunidad de
Madrid grant S-2009/TIC-1468 (MEDIANET project).Publicad
Wireless Sensor Network Virtualization: A Survey
Wireless Sensor Networks (WSNs) are the key components of the emerging
Internet-of-Things (IoT) paradigm. They are now ubiquitous and used in a
plurality of application domains. WSNs are still domain specific and usually
deployed to support a specific application. However, as WSN nodes are becoming
more and more powerful, it is getting more and more pertinent to research how
multiple applications could share a very same WSN infrastructure.
Virtualization is a technology that can potentially enable this sharing. This
paper is a survey on WSN virtualization. It provides a comprehensive review of
the state-of-the-art and an in-depth discussion of the research issues. We
introduce the basics of WSN virtualization and motivate its pertinence with
carefully selected scenarios. Existing works are presented in detail and
critically evaluated using a set of requirements derived from the scenarios.
The pertinent research projects are also reviewed. Several research issues are
also discussed with hints on how they could be tackled.Comment: Accepted for publication on 3rd March 2015 in forthcoming issue of
IEEE Communication Surveys and Tutorials. This version has NOT been
proof-read and may have some some inconsistencies. Please refer to final
version published in IEEE Xplor
RELOAD/CoAP P2P Overlays for Network Coding Based Constrained Environments
The Internet of Things will bring into the Internet all kinds of smart systems, which will be able to interact with each other. Therefore, applications relying on data sharing for collaboration will increase, and effective distributed solutions for data storage become necessary. This need led to the proposal of a CoAP Usage for RELOAD, a generic P2P protocol that accepts pluggable application layers (Usages). This allows P2P overlay networks to be built where constrained systems store their data and clients are able to retrieve it. Since many smart systems rely on wireless networks to communicate, where network coding can be used to reduce packet error rate, P2P overlays should be prepared to store data from network coding based networks. More specifically, encoding vectors and encoded data must be stored, and a decoding service is required. In this article, we propose a CoAP Usage extension so that network coding based constrained networks can use RELOAD/CoAP P2P distributed storage.FCT (Foundation for Science and Technology) from Portugal within CEOT Research Center [UID/MULTI/00631/2013]Thamar University - Yeme
XIII Jornadas de ingeniería telemática (JITEL 2017)
Las Jornadas de Ingeniería Telemática (JITEL), organizadas por la Asociación de Telemática (ATEL), constituyen un foro propicio de reunión, debate y divulgación para los grupos que imparten docencia e investigan en temas relacionados con las redes y los servicios telemáticos. Con la organización de este evento se pretende fomentar, por un lado el intercambio de experiencias y resultados, además de la comunicación y cooperación entre los grupos de investigación que trabajan en temas relacionados con la telemática.
En paralelo a las tradicionales sesiones que caracterizan los congresos científicos, se desea potenciar actividades más abiertas, que estimulen el intercambio de ideas entre los investigadores experimentados y los noveles, así como la creación de vínculos y puntos de encuentro entre los diferentes grupos o equipos de investigación. Para ello, además de invitar a personas relevantes en los campos correspondientes, se van a incluir sesiones de presentación y debate de las líneas y proyectos activos de los mencionados equiposLloret Mauri, J.; Casares Giner, V. (2018). XIII Jornadas de ingeniería telemática (JITEL 2017). Editorial Universitat Politècnica de València. http://hdl.handle.net/10251/97612EDITORIA