times_periodically.m

此程序为发表过的一篇IEEE PIMRC 的paper的程序代码。是关于异构无线网络环境下的垂直切换接口激活时间的几个方案的仿真性能比较。

function [p,delay_nd] = times_periodically(speed,x,y,ap,rx_threshold,t)

direction = pi/4;
counter = 0;
d_mt_ap = sqrt((x-ap.x)^2+(y-ap.y)^2);
%t = 7;

for times = 1:300
    d_ap = sqrt((x-ap.x)^2+(y-ap.y)^2);
    rss = ap.pt*(ap.antenna^2)/(d_ap^4);
    if (rss >= rx_threshold)
        counter = counter + 1;
    else
        counter = 0;
    end
    if (counter == 5)
        p = times;
        %delay_nd = (ap.r- d_ap)/speed;  % time spent from the mt start moving to discover WLAN.
        distance = sqrt(x^2+y^2);
        delay_nd = distance/speed;
        break;
    end
    d = speed*t;
    x = x+d*sin(direction);
    y = y+d*cos(direction);
end