نتایج جستجو برای: پروتکل zigbee

تعداد نتایج: 6065  

2009
H. B. Kazemian

This paper is concerned with an intelligent application of Moving Picture Expert Group (MPEG) video transmission over IEEE 802.15.4 – ZigBee. MPEG Variable Bit Rate (VBR) video is data hungry and presents excessive time delay and data loss over a wireless communication. Conventional rate policing such as generic cell rate algorithm is inadequate to sufficiently regulate transmission of VBR data...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز 1389

کیفیت ارائه خدمات در شبکه ها از اهمیت ویژه ای برخوردار است که معیارهایی مانند گذردهی مفید، تاخیر و نرخ خطای بیت برای ارزیابی آن مورد استفاده قرار می گیرد. هر شبکه از لایه های مختلفی تشکیل می شود که هر لایه، خود دارای پروتکل مخصوص به خود می باشد؛ از جمله پروتکل های لایه دسترسی به محیط که در چگونگی تشکیل شبکه، میزان مصرف توان شبکه و نحوه دسترسی گره به کانال نقش موثری دارد و می تواند با کاهش تداخل...

2016
Tariq Lasloum Ahmad S. Almogren

Devices are becoming increasingly interconnected; linked with each other and with humans. The internet of things(IoT) concept is currently used in machine to machine (M2M) applications like power, gas, and oil utilities transmission and transport. The most profound challenge that IoT faces is how to connect several very different devices into a network of things. In this regard, the standard fo...

2011

To overcome the limitations of InfraRed (IR) remote control technology, ZigBee® RF4CE specification was first published in May 2009. It quickly became the dominant core technology that drives development of next generation remote control applications. ZigBee RF4CE technology uses IEEE 802.15.4 as its PHYsical (PHY) and Medium Access Control (MAC) layers, and builds network layer on top of them....

2017
Peizhe Tian Chunwang Li Yimin Wu

This paper presents a kind of message conversion method between wired/wireless hybrid network, aiming at meeting the encapsulation and transmission application requirements of Building Automation and Control network (BACnet) protocol messages in ZigBee network. It also proposes a kind of compatible frame structure and addressing method which is specific to wired/wireless network hybrid transmis...

2014
Yi Lu

The lighting industry has been comprehensively developed and deployed during recent decades, especially with the rise of LED technology. As a related technique field, lighting control system has also draw more and more attention; therefore intelligent lighting control systems are needed. Nowadays, several famous lighting companies are working on a next generation of lighting control system, whi...

Journal: :Signal Processing Systems 2010
Ling-Jyh Chen Tony Sun Nia-Chiang Liang

Based on the IEEE 802.15.4 LR-WPAN specification, the ZigBee standard has been proposed to interconnect simple, low rate, and battery powered wireless devices. The deployment of ZigBee networks is expected to facilitate numerous applications, such as home healthcare, medical monitoring, consumer electronics, and environmental sensors. For many of the envisioned applications, device mobility is ...

2011
Archana R. Raut L. G. Malik

Industrial automations which are mostly depend upon the power systems & which requires distance controlled and regulated systems. Mostly voltage and current equipped parameters along with power and energy management system forms the industrial scenario for automations. Wireless technology which meets to cost, speed and distance scenario will always be a point of an interest for research. In thi...

2006
O. Hyncica P. Kacz P. Fiedler Z. Bradac P. Kucera R. Vrba

The ZigBee standard is out for more than one year and real-world applications already exist. The deployment of applications based on ZigBee depends heavily on the performance of the radio. It is not easy to determine the parameters for a certain location and there is not much information or guidelines for this yet. As very efficient way seems a simple on site testing, but for this it is importa...

2015
Chih-Yung Chang Jian-Cheng Chen Hung-Yu Wang

Network communication and micro-electro-mechanical embedded technologies have attracted much attention in recent years. Through these technologies, the capabilities of sensing, identification, and communication can be embedded in various smart devices. These smart devices can automatically connect to the Internet and form an intelligent network called Internet of Things (IoT). However, these de...

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