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 TDMA-based Congestion Avoidance MAC protocol Energy Efficient MAC Protocol for Wireless Sensor Networks.
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TDMA-based Congestion Avoidance MAC protocol Energy Efficient MAC Protocol for Wireless Sensor Networks.

издательство Книга по Требованию Прочие виды транспорта
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Аннотация:In this thesis, we propose an enhanced TDMA-based MAC protocol for energy-efficiency in wireless sensor networks. If many data packets are generated to transmit at once, the existing TDMA-based protocols in general wireless networks can transfer data packets to the sink node without collision and congestion, because the nodes are scheduled for different time slots in order to communicate with their neighboring nodes. Through the elaborate analysis and simulation using sensor module, the results show that the proposed scheme meets the requirement for both throughput and power saving. The general TDMA-based schemes should, however, be modi-fied for wireless sensor networks since each node must turn off its radio during idle listening for precious power savings. The proposed MAC scheme reduces energy consumption by using power gate packet that allows the receive node to predict its schedule of data reception.
Издательство: Книга по Требованию
Год:2008
Цена:
2007 руб
Нет в наличии
Поиск: TDMA-based Congestion Avoidance MAC protocol Energy Efficient MAC Protocol for Wireless Sensor Networks.
НОВЫЙ ГОД СИМВОЛ 2013 ГОДАУКРАШЕНИЯ
КАРНАВАЛ НА НОВЫЙ ГОД РАСПРОДАЖА
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Технология FDDI

Станции могут не иметь ни одного узла MAC, и, значит, участвовать только в ретрансляции чужих кадров. Но обычно все станции сети FDDI, даже концентраторы, имеют хотя бы один MAC. Концентраторы используют MAC-узел для захвата и генерации служебных кадров, например, кадров инициализации кольца, кадров поиска неисправности в кольце и т.п. Станции, которые имеют один MAC-узел, называются SM (Si gle MAC) станциями, а станции, которые имеют два MAC-узла, называются DM (Dual MAC) станциями. Возможны следующие комбинации типов присоединения и количества MAC-узлов: SM/SA Станция имеет один MAC-узел и присоединяется только к первичному кольцу. Станция не может принимать участие в образовании общего кольца из двух. SM/DA Станция имеет один MAC-узел и присоединяется сразу к первичному и вторичному кольцам. В нормальном режиме она может принимать данные только по первичному кольцу, используя второе для отказоустойчивой работы. DM/DA Станция имеет два MAC-узла и присоединена к двум кольцам. Может (потенциально) принимать данные одновременно по двум кольцам (полнодуплексный режим), а при отказах участвовать в реконфигурации колец. DM/SA Станция имеет два MAC-узла, но присоединена только к первичному кольцу.
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