基于拓?fù)浣Y(jié)構(gòu)的分布式無線傳感器網(wǎng)絡(luò)的功率控制文獻翻譯-在線瀏覽
2024-08-04 03:53本頁面
【正文】 etwork. Also, they propose the global solution with diverse transmission power algorithm that creates a connected network and set different transmission ranges for all the nodes, even if the topology construction is over. So, in their work the energy consumption of the nodes may be more, as the nodes in WSN are close to each other.In WSN, munication is the main factor of the energy consumption [20]. However, transmission power adjustment to control the topology can extend the network lifetime and enhance the capability of the sensor network. Moreover, without controlling the transmission power level and always using a fixed higher power level for all nodes of the network will make the nodes die quickly and minimize the network life time. Since, the collected sensed data may contain some important information as required by the sink, providing a connected topology for the multihop network is highly essential for the wireless sensor network. Hence, in our work we propose how to control the transmission power level of each nodes of the network to save energy. We propose a distributed algorithm that adjust the transmission power levels of the nodes dynamically and construct a single tree topology with an intermediate power level between the minimum and maximum, among different group of nodes to achieve a connected network. Our algorithm works in a multihop wireless sensor network without taking location information of the nodes and constructs the connected topology distributive.The rest of the paper is organized as follows. System model of our protocol is presented in Section 2. Our distributed power control protocol is described in Section 3. Performance analysis and simulation results are presented in Section 4 and conclusion is drawn in Section 5 of the paper.2 System modelLet us consider a multihop, homogeneous wireless sensor network, in which sensor nodes are randomly and densely deployed over certain geographical area such that small connectivity holes exist among different group of nodes, as shown in . It is also assumed that the sink is within munication range of at least one node of the network. The connectivity holes in the network may occur due to small physical gaps among different group of nodes at the time of deployment or due to gap among the nodes of the same region, as they are unable to be connected with minimum transmission power level(Pmin). However, initially all nodes either from the same or different groups use a fixed transmission power level for munication and form a connected network without any power control. This fixed transmission power level could be assumed as the maximum(Pmax) or in between the minimum and maximum power levels. As per our experimental results performed using Mica mote [21] with RF frequency 866MHZ and given in Table 1,0 is considered as the minimum(Pmin)and 3 as the maximum(Pmax)transmission power level for municating among nodes and we consider this value throughout our paper. Before proceeding to the next section of the paper, we define few technical terms that are used in our protocol.Fig. deployed sensor nodes with connectivity holes among different group of nodes.Table 1Energy consumption for different power levels and corresponding munication distance, obtained from our experimental resultPower levels0123Output power（dBm）13715Range（m）177。177。Current consumption(mA) Definitions Upstream and Downstream Groups: Let {G1,G2,G3,…}be the set of group of nodes distributed over certain area. If two groups
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