基于zigbee的如光溫室有害氣體檢測報(bào)警系統(tǒng)設(shè)計(jì)外文翻譯-閱讀頁
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【正文】 e child of the first found ancestor, the depth of it is the depth of the first mon ancestor. In the same depth, searching happens in router child and is started with one of them that it has smallest address.After calculating the Ht and setting the hop count equal to it, destination node receives RREQ packet. Sometimes the optimal hop count is not Ht. Because, in tree routing, it is possible that source and destination are in the coverage range of together or destination can receive packets, if it is in the coverage range of a router node that is not its parent but it can ensure that packets receive to their destinations. It can reduce the number of sent RREQ packet. As a consequence, the amount of consumed energy decreases.4 Simulations and ResultsFor simulation, OPNET [7] simulator is used. In this case, area is considered100m100m and operational frequency is with 250Kbps. Also, the number of nodes increases up to 200 and the all amounts of Rm, Cm and Lm are the same, namely, 7. Also, achieving to parison of the amounts of sent overhead is the goal of experiments in the AODVjr and FLAODVjr methods when the destination node is random. Reduction in mentioned parameter causes reduction in power consumption.Figure 3 demonstrates the amount of munication overhead of both approaches. In this case, FLAODVjr sends munication overhead less than another. This difference rises with increasing the number of node in the network. The high number of nodes causes the rising in the depth of the network. It increases the number of hops between source and destination. Thereby, sent routing packets or munication overhead will climb .Fig. 3. Comparison of Overhead in AODVjr and FLAODVjr5 ConclusionIn this paper, a method is suggested for reducing in power consumption of ZigBee Technology. It limits the broadcasting routing packets that use in AODV routing algorithm by the use of tree routing’s algorithm. The amount of hop count is set based on counterpart parameter in tree algorithm. Doing this work decreases the number of sent packets for finding the path between source and destination. Thereby, the consumed energy for sending mentioned packets is reduced and it helps to increase the lifetime of the network. Also, the result of simulation proves the above discussed issues.References1. Lin, S.: ZigBee Based Wireless Sensor Networks and Its Applications in Industrial. In: IEEE International Conference on Automation and Logistics, pp. 1979–1983. IEEE Xplore, Jinan (2007)2. IEEE Standard .: Standard for Information Technologytelemunications and information exchange Systems between systems Local and metropolitan area networks(2006), 3. Li, J., Zhu, X., Tang, N., Sui, J.: Study on ZigBee Network Architecture and Routing Algorithm. In: International Conference on Signal Processing Systems, pp. 389–393. IEEE Xplore, Dalian (2010)4. Perkins, ., Royer, .: Ad Hoc OnDemand Distance Vector Routing. In: Second IEEE Workshop Mobile Computing Systems and Applications, pp. 90–100. IEEE Xplore, New Orleans (1999)5. Chakeres, ., KleinBerndt, L.: AODVjr, AODV Simplified. ACM Mobile Computing and Communications Review, 100–101 (2002)6. Lin, Z., Meng, ., Liang, H.: A Route Discovery Method Based on Limited Flooding in ZigBee Network. In: IEEE International Conference on Automation and Logistics, Qingdao, pp. 3039–3044 (2008)7. OPNET Network Simulator Software,
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