1 简介
In wireless sensor networks (WSNs), utilizing the unmanned aerial vehicle (UAV) as a mobile data collector for the ground sensor nodes (SNs) is an energy-efficient technique to prolong the network lifetime. Specifically, since the UAV can sequentially move close to each of the SNs when collecting data from them and thus reduce the link distance for saving the SNs transmission energy. In this letter, considering a general fadingchannel model for the SN-UAV links, we jointly optimize the SNs’ wake-up schedule and UAV’s trajectory to minimize the maximum energy consumption of all SNs, while ensuring that the required amount of data is collected reliably from each SN. We formulate our design as a mixed-integer non-convex optimization problem. By applying the successive convex optimization technique, an efficient iterative algorithm is proposed to find a sub-optimal solution. Numerical results show that the proposed scheme achieves significant network energy saving as compared to benchmark schemes.
2 部分代码
%Energy-Efficient Data Collection in UAV Enabled Wireless Sensor Network Cheng Zhan , Member, IEEE, Yong Zeng , Member, IEEE, and Rui Zhang , Fellow, IEEE % Jongseok Lee, kwangwoon university, seoul, korea. % figure1.(a) and (b) clearall closeall addpath('./src') globaluq0qF istrain=0 ifistrain==1 %% Optimization Q= {}; X= {}; Theta= {}; Lo= {}; forT= [4050100] disp(['T ='num2str(T)', start']) [q,x,th,lo]=solveP1('T',T,'Sk',10*(10^6),'epsilon',10^-2); disp(['T ='num2str(T)', end']) Q=cat(1,Q, {q}); X=cat(1,X, {x}); Theta=cat(1,Theta,{th}); Lo=cat(1,Lo, {lo}); end else load('./data/Fig1.mat') parameter_setting('Sk',10*(10^6),'epsilon',10^-2); end %% figure 1.(a) figure(11) holdon plot(Q{1}Q{1}'--b',Q{2}Q{2}'-.r',Q{3}Q{3}'-k'); scatter(u(1,:),u(2,:),'xk'); legend('T=40s','T=50s','T=100s'); axis([-800800-800800]) gridon title('Fig. 1.(a), UAV trajectory') xlabel('x') ylabel('y') text(q0(1),q0(2),'\leftarrow Initial point'); text(qF(1)-300,qF(2),'Final point \rightarrow'); fork=1:4 text(u(1,k),u(2,k),['u_{',num2str(k),」； end drawnow %% figure 1.(b) figure(13) Xr=X{2}; t=zeros(4,1); fork=1:4 t(k) =graythresh(Xr(:,k)); end t=min(t)*1.2; Xr(Xr>=t) =1; Xr(Xr<t) =0; plot([0:99]*50/99,Xr(:,1), '-r',[0:99]*50/99,Xr(:,2), '--b', [0:99]*50/99,Xr(:,3),':k',[0:99]*50/99,Xr(:,4), '-.m'); legend('SN u_{1}','SN u_{2}','SN u_{3}','SN u_{4}','Location','north','NumColumns',4); axis([05001.25]) title('Fig.1(b), Wake-up schedule (T=50s)'); yticks([01]) yticklabels({'Sleep','Wake-up'}) drawnow %% save datas mkdir./data save('./data/Fig1.mat','X','Q','Theta');
3 仿真结果
4 参考文献
[1] Zhan, C. , Y. Zeng , and R. Zhang . "Energy-Efficient Data Collection in UAV Enabled Wireless Sensor Network." IEEE Wireless Communication Letters PP.99(2017):1-1.