Wyniki wyszukiwania - BazTech

1

Protocols for Wireless Sensor Networks: A Survey

Kochhar A., Kaur P., Singh P., Sharma S.

Journal of Telecommunications and Information Technology

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2018

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nr 1

77--87

EN

This paper presents a survey on the MAC and network layer of Wireless Sensor Networks. Performance requirements of the MAC layer are explored. MAC layer protocols for battery-powered networks and energy harvesting-based networks are discussed and compared. A detailed discussion on design constraints and classification of routing protocols is presented. Several routing protocols are compared in terms of such parameters as: energy consumption, scalability, network lifetime and mobility. Problems that require future research are presented. The cross-layer approach for WSNs is also surveyed.

2

Integracja międzywarstwowa protokołów RM-AODV, Multicast DNS i IPv6 Neighbor Disconery w środowisku sieci standardu IEEE 802.11s

Gierłowski K.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2016

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nr 8-9

1185--1190, CD

PL

Wraz z rozwojem bezprzewodowych technik transmisyjnych oraz wzrostem liczby i zasobów urządzeń mobilnych, wzrasta również popularność sieci bezprzewodowe o architekturze mesh, które znajdują rozliczne zastosowania w systemach dostępowych i dystrybucyjnych. W artykule przedstawiono krótką analizę efektywności działania protokołów IPv6 Neighbor Discovery oraz Multicast DNS w środowisku sieci IEEE 802.11s oraz propozycję metody jej poprawy poprzez zastosowanie mechanizmów integracji międzywarstwowej.

EN

Popularization of wireless transmission technologies and growth of number and resources of mobile computing devices makes wireless mesh networks a viable solution for a number of tasks in access in distribution systems. The paper presents a short analysis of efficiency of IPv6 Neighbor Discovery and Multicast DNS in IEEE 802.11s mesh network, complete with a proposition of a cross-layer procedure designed to improve it.

3

Interworking and cross-layer service discovery extensions for IEEE 802.11s wireless mesh standard

Gierłowski K.

Journal of Telecommunications and Information Technology

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2013

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nr 3

97--105

EN

With the rapid popularization of mobile end-user electronic devices, wireless network technologies begin to play a crucial role as networks access technologies. While classic point-to-multipoint wireless access systems, based on fixed infrastructure of base stations providing access to clients, remain the main most popular solution, an increasing attention is devoted to wireless mesh systems, where each connecting client can extend overall resources of the network by becoming a network node capable of forwarding transit traffic. This ability results in severe reduction of the necessary network infrastructure, provides through coverage (thereby offering significant step towards ubiquity of network access) and offers massive redundancy. One of the most promising wireless mesh solutions currently being developed is an IEEE 802.11s standard, based on popular Wi-Fi technology. It combines low deployment costs with comprehensive suite of mechanisms able to operate a self-forming, autoconfigurable, dynamically extending, and secure mesh solution. However, despite its advantages, the standard lacks sufficient support for a number of functionalities, which can lead to significant inefficiency and degradation of service quality in real-world IEEE 802.11s network deployments. In the paper we propose a number of extensions of IEEE 802.11s mechanisms, designed to provide better service quality in case of real-world deployment scenarios, especially in case of large systems. Both propositions introduce modifications to mesh path discovery and interworking procedures, while retaining compatibility with standard solution. Their basic functionality and efficiency have been verified by means of simulation model in large-scale, self-organizing mesh structure. Subsequently they have been implemented and tested in real-world, access network testbed deployment. The results clearly indicate their utility, particularly in case of larger deployments of this network system type.

4

Wykorzystanie projektowania międzywarstwowego dla transmisji multimedialnej w bezprzewodowych sieciach WLAN

Łubkowski P.

Biuletyn Wojskowej Akademii Technicznej

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2006

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Vol. 55, nr sp.

221-240

PL

W artykule przedstawiono ogólną ideę realizacji usług multimedialnych z gwarancjami jakości w bezprzewodowych sieciach WLAN. Dokonano charakterystyki bezprzewodowych sieci WLAN oraz wymagań jakościowych dla transmisji multimedialnej, ze szczególnym uwzględnieniem transmisji wideo. Przeprowadzono analizę rozwiązań projektowania międzywarstwowego wspierających realizację usług wideo z gwarancjami jakości. W dalszej części artykułu zaprezentowana została autorska koncepcja wykorzystania projektowania międzywarstwowego do realizacji transmisji wideo QoS w sieci WLAN.

EN

The overall idea of QoS multimedia services in WLAN is presented. Short description of WLAN and quality requirements for multimedia transmission with special attention to video transfer, are presented too. The analysis of cross-layer solutions for QoS video is given in the paper. In the last part, the concept of using cross-layer for QoS video transmission in WLAN is shown.