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(xiàn)翻譯-文庫吧在線文庫
【正文】 hance 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。然而對于其它組中的父網(wǎng)關(guān)Pmin ＜PGPL ≤Pmax按我們的假設(shè)這值可能在1和3之間。節(jié)點(diǎn)的每個(gè)組中存在只有一個(gè)父網(wǎng)關(guān)。本地躍點(diǎn)計(jì)數(shù)LHC：這是表示的控制數(shù)據(jù)包遍歷本地一的組內(nèi)時(shí)它發(fā)送到另一個(gè)節(jié)點(diǎn)的躍點(diǎn)數(shù)的計(jì)數(shù)器。177。2系統(tǒng)模型讓我們考慮一種單一的多跳的無線傳感器網(wǎng)絡(luò)傳感器和部署在某些隨機(jī)地理區(qū)域這樣小的連通性存在不同組的節(jié)點(diǎn)如圖1。收集數(shù)據(jù)感覺到最重要的信息可能包含一些要求提供一種連接網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)是非常必要的無線傳感器網(wǎng)絡(luò)。雖然該算法[18]是專為無線網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)的優(yōu)化它是一個(gè)集中并不能改變發(fā)射功率動(dòng)態(tài)。雖然這個(gè)協(xié)議保護(hù)網(wǎng)絡(luò)的連接和談?wù)撊绾慰刂频耐負(fù)浣Y(jié)構(gòu)它不談網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)和能耗的密度較大的問題如無線傳感器網(wǎng)絡(luò)節(jié)點(diǎn)。詳細(xì)分析了在[12]。在[10]的基礎(chǔ)上,在作者建議中的理想的發(fā)射功率評估通過節(jié)點(diǎn)互動(dòng)與信號衰減節(jié)點(diǎn)的無線傳感器網(wǎng)絡(luò) MAC 協(xié)議的傳輸功率控制。傳感器節(jié)點(diǎn)一般都是自組織建立了無線傳感器網(wǎng)絡(luò)監(jiān)察活動(dòng)的目標(biāo)和報(bào)告的事件或信息多跳中的基站。節(jié)點(diǎn)的能量守恒是由傳輸功率控制完成的。除此之外維護(hù)的網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)由于能源短缺的節(jié)點(diǎn)也提出了協(xié)議。有四種主要的報(bào)告模式的傳感器網(wǎng)絡(luò):事件驅(qū)動(dòng)、隊(duì)列驅(qū)動(dòng)、期刊、查詢和混合的報(bào)告。計(jì)算理想的發(fā)射功率的反復(fù)改進(jìn)和存儲當(dāng)前的理想發(fā)射功率，為每個(gè)相鄰的節(jié)點(diǎn)。因?yàn)楣?jié)點(diǎn)是異構(gòu)的他們有不同的最大傳輸功率和廣播范圍需要可調(diào)整的功率控制的分布式天線。[17]是跨省電種技術(shù)特設(shè)的無線網(wǎng)絡(luò)無顯著降低能耗的能力或連接的網(wǎng)絡(luò)。分布式算法在無線傳感器網(wǎng)絡(luò)的傳輸功率控制提出了[19]。因此在我們的工作中我們提出如何控制
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