异构网络垂直切换算法LTE/WIMAX切换

水深无声 2022-09-06 04:53 158阅读 0赞

### **1.问题描述：** ###

###  异构网络垂直切换算法LTE/WIMAX切换 ###

### **2.部分程序：** ###

###  ###

%% the simulation of this program is for heterogeneous %%  
%% network in vertical handoff; %%  
%initial the parameters of network  
clear  
clc  
global fc\_LTE fc\_Wimax LTE\_BS\_coordinate Wimax\_BS\_coordinate ...  
Wimax\_BS\_coordinate LTE\_BS\_coordinate  
service\_type=0; %the subscriber type of service  
%0 refers to real time service,on the  
% contrary,1 refers to nonreal-time service  
MS\_coordinate=\[100,0\];  
LTE\_BS\_coordinate=\[0,0\]; %the coordinate of LTE BS  
Wimax\_BS\_coordinate=\[600,0\]; %the coordinate of wimaxE BS  
MS\_speed=10; %the speed of mobile station

fc\_LTE=2000\*10^6; %the frequency of the carrier for LTE  
fc\_Wimax=2500\*10^6; %the frequency of the carrier for Wimax  
Net\_state=0; %0 refers to LTE;1 refers to Wimax  
handoff\_drop=1;  
handoff\_clock=0;  
count\_handoff\_number=0;  
Tc=0.5; %time of measure interval  
record\_time=0; %record the number of interval time of system  
countinue\_run=true;

while countinue\_run  
  
%\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\# measure the receieved signal strength \#\#\#\#\#\#\#\#\#\#\#\#  
%if the mobile station is in the LTE network  
if is\_in\_LTE\_coverage(MS\_coordinate)  
RSS\_LTE=calculate\_RSS(MS\_coordinate,'LTE');  
else  
RSS\_LTE=-inf;  
end  
  
%if the mobile station is in the LTE network  
if is\_in\_Wimax\_coverage(MS\_coordinate)  
RSS\_Wimax=calculate\_RSS(MS\_coordinate,'Wimax');  
else  
RSS\_Wimax=-inf;  
end  
  
%\#\#\#\#\#\#\#\#\#\#\#\#\#\#\# decide whether to handoff according to RSS \#\#\#\#\#\#\#\#\#  
if Net\_state==0&&RSS\_LTE<RSS\_Wimax  
if handoff\_clock>handoff\_drop  
if is\_network\_performance\_meet(service\_type)==1||(...  
~is\_in\_LTE\_coverage(MS\_coordinate)&&...  
is\_in\_Wimax\_coverage(MS\_coordinate))  
%compare the performance of  
%new network with the past  
%network  
count\_handoff\_number=count\_handoff\_number+1;  
Net\_state=1;  
handoff\_clock=0; %reset the counter  
else  
handoff\_clock=0; %stay in the past network  
end  
else  
handoff\_clock=handoff\_clock+Tc;  
end  
elseif Net\_state==1&&RSS\_LTE>RSS\_Wimax  
if handoff\_clock>handoff\_drop  
if is\_network\_performance\_meet(service\_type)==0||(...  
is\_in\_LTE\_coverage(MS\_coordinate)&&...  
~is\_in\_Wimax\_coverage(MS\_coordinate))  
%compare the performance of  
%new network with the past  
%network  
count\_handoff\_number=count\_handoff\_number+1;  
Net\_state=0;  
handoff\_clock=0; %reset the counter  
else  
handoff\_clock=0; %stay in the past network  
end  
else  
handoff\_clock=handoff\_clock+Tc;  
end  
else  
handoff\_clock=0;  
end  
  
%\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\# decide whether to continue run \#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#  
if is\_in\_LTE\_coverage(MS\_coordinate)||...  
is\_in\_Wimax\_coverage(MS\_coordinate)  
  
%\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\# record the data \#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#  
record\_time=record\_time+1;  
record\_RSS\_LTE(record\_time)=RSS\_LTE;  
record\_RSS\_Wimax(record\_time)=RSS\_Wimax;  
record\_Net\_state(record\_time)=Net\_state;  
MS\_coordinate(1)=MS\_coordinate(1)+MS\_speed\*Tc;  
else  
countinue\_run=false;  
end  
end

%\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\# plot the simulation results \#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#  
t=\[1:record\_time\]\*Tc;  
plot(t,record\_RSS\_LTE,'--ro','MarkerEdgeColor','g','MarkerFaceColor','y',...  
'MarkerSize',2);  
hold on  
plot(t,record\_RSS\_Wimax,'-.ks','MarkerEdgeColor','b',...  
'MarkerFaceColor','c','MarkerSize',2);  
hold off  
grid on  
xlabel('time(s)');  
ylabel('RSS(dBm)');  
legend('LTE','Wimax');  
title('the received signal strength about two networks');  
figure  
plot(t,record\_Net\_state,'--ro','MarkerEdgeColor','g','MarkerFaceColor','y',...  
'MarkerSize',2)  
grid on  
xlabel('time(s)');  
ylabel('mark of network');  
text(0,0,'\\leftarrow LTE','FontSize',10)  
text(0,1,'\\leftarrow Wimax','FontSize',10)  
title('the state of mobile station in LTE and Wimax network')  
%\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#END THE PROGRAM \#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#

### **3.仿真结论：** ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Njc3NzMjI_size_16_color_FFFFFF_t_70][]

D109

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