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Механика. Динамика

Energy-Saving MAC protocols for Point-Controlled Wireless Networks. Best-Effort, QoS

Формат:      Страниц 152
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Ghazanfar A.S.    
Книга по Требованию    
2416 руб
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To account for effect of errors on performance, PCSAR was also compared with PCF-PS for both uncorrelated and time-correlated channel models. The book contains power saving techniques employed by standards for WPAN and WLANs, such as Bluetooth, Zigbee, HiperLan, and IEEE 802. 11. The steady state performance of PCSAR was compared with IEEE 802. 11b power saving mode (PCF-PS) using DES of a typical WLAN scenario. PCSAR, a new power-saving MAC protocol for centralized control wireless networks is presented in this book. As wireless networks become an integral component of the modern communication infrastructure, energy efficiency will be an important design consideration due to the limited battery life of mobile and portable terminals. Such devices must operate with the highest possible energy efficiency while still maintaining a minimum quality of service to meet the user’s expectations. Finally, PCSAR was modified to suit a QoS enabled MAC such as IEEE 802. 11e. This book should be useful for professionals both in academics and industry, in the field of wireless communications and networking, especially those engaged in the development of MAC protocols for wireless networks
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Технология WiMax
Он описывал общие принципы построения систем широкополосного беспроводного доступа и сосредотачивался на диапазоне 10-66 ГГц. 10 сентября 2001 года увидел свет стандарт IEEE 802.16.2 «Coexis e ce of Fixed Broadba d Wireless Access Sys ems» (сосуществование фиксированных систем широкополосного беспроводного доступа). Над более низкочастотным диапазоном работы продолжались чуть дольше – стандарт 802.16а «Medium Access Co rol Modifica io s a d Addi io al Physical Layer Specifica io s for 2-11 GHz» (модификации управления доступа к среде передачи и дополнительные спецификации физического уровня для диапазона 2-11 ГГц), регламентирующий работу в диапазоне 2-11 ГГц, был утвержден 29 января 2003 года, а 1 апреля опубликован. На рисунке 1 показано место стандарта 802.16 в иерархии стандартов IEEE 802. Место стандарта 802.16 в иерархии стандартов IEEE 802 Рис. 1 Физический и канальный уровни IEEE 802.16 Все стандарты группы 802.16 описывают два нижних уровня модели взаимодействия открытых систем (OSI) – физический и уровень контроля доступа к среде передачи (MAC – Medium Access Co rol)1.

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