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⛄ 内容介绍
随着汽车行业需求的增长，3GPP正在开发长期演进（LTE）蜂窝技术中的新功能，以专门解决车对所有（V2X）连接，特别是车对车（V2V）直接通信。在涉及安全性，交通管理或信息娱乐的大多数已启用应用程序的基础上，协作意识服务尤为重要，它对应于所有车辆在广播中定期发送的消息，以告知其状态和意图。为了优化无线电资源的使用，需要巧妙地执行数据包分配，遵循目前代表着一个具有挑战性的开放性问题的算法。考虑到解决协作意识时要面对LTE-V2V网络中资源分配的设计和验证，我们实现了一个名为LTEV2Vsim的模拟器，该模拟器将与所有感兴趣的研究人员共享。 LTEV2Vsim用MATLAB编写，可按照简单的模型或更复杂，更实际的输入文件管理车辆的机动性，并根据不同的已实现算法（包括网络控制和自主算法）执行分配。最后，为了演示LTEV2Vsim的可能性，提供了一些示例结果
⛄ 部分代码
% Simplified scenario to use WilabV2Xsim
% Packet size and MCS are set accordingly to utilize the whole channel
% Each transmission uses all the subchannels available.
% NR-V2X is considered for these simulations
% WiLabV2Xsim('help')
close all % Close all open figures
clear % Reset variables
clc % Clear the command window
packetSize=1000; % 1000B packet size
nTransm=1; % Number of transmission for each packet
sizeSubchannel=10; % Number of Resource Blocks for each subchannel
Raw = [50, 150, 300]; % Range of Awarness for evaluation of metrics
speed=70; % Average speed
speedStDev=7; % Standard deviation speed
SCS=15; % Subcarrier spacing [kHz]
pKeep=0.4; % keep probability
periodicity=0.1; % periodic generation every 100ms
sensingThreshold=-126; % threshold to detect resources as busy
% Configuration file
configFile = 'Highway3GPP.cfg';
%% NR-V2X PERIODIC GENERATION
for BandMHz=[10]
if BandMHz==10
MCS=11;
elseif BandMHz==20
MCS=5;
end
for rho=[100 200 300] % number of vehicles/km
% Just for visualization purposes the simulations time now are really short,
% when performing actual simulation, each run should take at least
% 30mins or one hour of computation time.
if rho==100
simTime=10; % simTime=300
elseif rho==200
simTime=5; % simTime=150;
elseif rho==300
simTime=3; % simTime=100;
end
% HD periodic
outputFolder = sprintf('Output/NRV2X_%dMHz_periodic',BandMHz);
% Launches simulation
WiLabV2Xsim(configFile,'outputFolder',outputFolder,'Technology','5G-V2X','MCS_NR',MCS,'SCS_NR',SCS,'beaconSizeBytes',packetSize,...
'simulationTime',simTime,'rho',rho,'probResKeep',pKeep,'BwMHz',BandMHz,'vMean',speed,'vStDev',speedStDev,...
'cv2xNumberOfReplicasMax',nTransm,'allocationPeriod',periodicity,'sizeSubchannel',sizeSubchannel,...
'powerThresholdAutonomous',sensingThreshold,'Raw',Raw,'FixedPdensity',false,'dcc_active',false,'cbrActive',true)
end
end
%% PLOT of results
figure
hold on
grid on
for iCycle=1:3
rho=100*iCycle;
% Loads packet reception ratio output file
xMode2_periodic=load(outputFolder + "/packet_reception_ratio_"+num2str(iCycle)+"_5G.xls");
% PRR plot
% it takes the first column and the last column
plot(xMode2_periodic(:,1),xMode2_periodic(:,end),'linewidth',2.5,'displayName',"Mode2, periodic generation, vehicles/km=" + num2str(rho))
end
legend()
title("NR-V2X, " + num2str(BandMHz) + "MHz, MCS=" + num2str(MCS))
legend('Location','southwest')
xlabel("Distance [m]")
ylabel("PRR")
yline(0.95,'HandleVisibility','off');
⛄ 运行结果
⛄ 参考文献
G. Cecchini, A. Bazzi, B. M. Masini, A. Zanella, “LTEV2Vsim: An LTE-V2V Simulator for the Investigation of Resource Allocation for Cooperative Awareness”, 5th IEEE International Conference on Models and Technologies for Intelligent Transportation Systems (MT-ITS 2017), Naples (Italy), 26-28 June 2017. (Results obtained with version 1.0)
A. Bazzi, G. Cecchini, M. Menarini, B. M. Masini, A. Zanella, “Survey and Perspectives of Vehicular Wi-Fi Versus Sidelink Cellular-V2X in the 5G Era,” invited paper in Future Internet, 29 May 2019, 11(6), 122. DOI: 10.3390/fi11060122 (Results obtained with version 3.5)
