从RSU向静脉中的车辆发送信息

Question

我试图在静脉中实现一个小例子: RSU广播自己的ID和其他信息，而车辆接收RSU的ID并记录它。我创建了一个名为BeaconRSU.msg的新的msg文件，应用层的RSU和vehicle的cc文件如下所示：

//MyVeinsAppRSU.cc
#include "veins/modules/application/traci/MyVeinsAppRSU.h"
#include "veins/modules/application/traci/BeaconRSU_m.h"

using namespace veins;

Define_Module(veins::MyVeinsAppRSU);

void MyVeinsAppRSU::initialize(int stage)
{
  DemoBaseApplLayer::initialize(stage);
    if (stage == 0) {
        sendBeacon= new cMessage("send Beacon");
        EV << "Initializing " << par("appName").stringValue() << std::endl;
    }
    else if (stage == 1) {
        // Initializing members that require initialized other modules goes here
        if (sendBeacon->isScheduled())
        {
            cancelEvent(sendBeacon);
        }
        scheduleAt(simTime()+5,sendBeacon);
    }
}

void MyVeinsAppRSU::handleSelfMsg(cMessage* msg)
{
if (msg == sendBeacon){

    BeaconRSU* rsuBeacon = new BeaconRSU();
    rsuBeacon->setRSUId(this->getParentModule()->getIndex());
    rsuBeacon->setMyDemoData("RSU message!!");
    BaseFrame1609_4* WSM = new BaseFrame1609_4();
    WSM->encapsulate(rsuBeacon);
    populateWSM(WSM);
    send(WSM,lowerLayerOut);
    EV << "rsu send success" <<endl;
    if (simTime() < 2000) {
    scheduleAt(simTime()+1,sendBeacon);
    }
    return;
}

}

//MyVeinsAppCar.cc
#include "veins/modules/application/traci/MyVeinsAppCar.h"
#include "veins/modules/application/traci/BeaconRSU_m.h"
#include "veins/modules/application/traci/MyVeinsAppRSU.h"

using namespace veins;

Define_Module(veins::MyVeinsAppCar);

void MyVeinsAppCar::initialize(int stage)
{
    DemoBaseApplLayer::initialize(stage);
    if (stage == 0) {
        // Initializing members and pointers of your application goes here
        EV << "Initializing " << par("appName").stringValue() << std::endl;
        int a = INT_MIN;
    }
    else if (stage == 1) {
        // Initializing members that require initialized other modules goes here
        RSUIndex.setName("test");
        int a= INT_MIN;
        EV << "MyVeinsAppCar is initializing" << std::endl;
    }
}

void MyVeinsAppCar::handleLowerMsg(cMessage* msg)
{
    BaseFrame1609_4* WSM = check_and_cast<BaseFrame1609_4*>(msg);
    cPacket* enc = WSM->getEncapsulatedPacket();
    BeaconRSU* bc = dynamic_cast<BeaconRSU*>(enc);
    EV << "receive message  !!!" << endl;
    if(a!=bc->getRSUId())
    {
       RSUIndex.record(bc->getRSUId());
       a=bc->getRSUId();
    }
    EV << "my message = " <<bc->getMyDemoData()<<endl;
    EV <<"send message RSU id:" <<bc->getRSUId() << "  Receive successfully !!!!!!!!!!!" << endl;    }

当我运行模拟时，我可以看到从RSU成功发送的msg，但是节点无法接收msg ( MyVeinsAppCar::handleLowerMsg(cMessage* msg)中的内容没有打印出来)。日志中有一些错误：在这里输入图像描述

为什么会发生这种情况？有人帮我吗？提前谢谢你！

//BeaconRSU.msg

cplusplus{{
#import "veins/base/utils/Coord.h"
#import "veins/modules/utility/Consts80211p.h"
#include "veins/modules/messages/BaseFrame1609_4_m.h"
#include "veins/base/utils/SimpleAddress.h"
}};

namespace veins;

// TODO generated message class

class noncobject Coord;
class BaseFrame1609_4;

packet BeaconRSU extends BaseFrame1609_4
{
    //id of the originator
    int RSUId = 0;
    Coord position[100];
    double beaconrate[100];
    string myDemoData;
    Coord slotpos;
    simtime_t timestamp=0;
}

调试模式日志的部分如下所示：

​

​

​

​

Answer 1

您似乎是在“释放”模式下运行模拟，而不是“调试”模式。虽然这将让您的模拟运行得更快，但它忽略了许多正常检查，并且只输出了有关模拟中所发生的事情的最小信息。由于所有这些原因，强烈建议只在“释放”模式下运行完全完成后的模拟。

有关如何在调试模式下运行模拟的信息，请参阅“如何调试我的OMNeT++仿真模型?如何创建堆栈跟踪”。在http://veins.car2x.org/documentation/faq/

在调试模式下运行模拟时，您应该会看到更多的日志信息，这些信息解释了模拟过程中发生了什么。例如，日志输出可能如下所示：

** Event #100 t=1 ...nic.phy80211p (PhyLayer80211p, id=1)  on selfmsg  (veins::AirFrame11p, id=1)
TRACE (PhyLayer80211p)...nic.phy80211p: Processing AirFrame...
TRACE (PhyLayer80211p)...nic.phy80211p: Packet has bit Errors. Lost
TRACE (PhyLayer80211p)...nic.phy80211p: packet was not received correctly, sending it as control message to upper layer
TRACE (PhyLayer80211p)...nic.phy80211p: Channel idle now!
TRACE (PhyLayer80211p)...nic.phy80211p: End of Airframe with ID 6.

** Event #101 t=2 ...nic.mac1609_4 (Mac1609_4, id=2)  on Error (omnetpp::cMessage, id=1)
TRACE (Mac1609_4)RSUExampleScenario.node[27].nic.mac1609_4: A packet was not received due to biterrors

在本例中，调试消息Packet has bit Errors. Lost (请参阅https://github.com/sommer/veins/blob/veins-5.1/src/veins/modules/phy/Decider80211p.cc#L151)将告诉您已尝试解码(即信号足够强，可由接收方检测到)，但解码失败。您所使用的Phy层模型是基于SINR (信号功率与干扰和噪声功率的比率)来决定是否接收到一个传输的(参见https://github.com/sommer/veins/blob/veins-5.1/src/veins/modules/phy/Decider80211p.cc#L142)，因此这可能有两个原因之一:信号可能是弱的(传输功率低，发送方太远)，或者干扰信号可能太强(其他人同时发送)。如果您对这两种情况中的哪一种感兴趣，可以启用NIC的phy80211p模块的参数https://github.com/sommer/veins/blob/veins-5.1/src/veins/modules/phy/PhyLayer80211p.ned#L43(参见https://github.com/sommer/veins/blob/veins-5.1/src/veins/modules/phy/PhyLayer80211p.ned#L43)。而不仅仅是Packet has bit Errors，您将看到Packet has bit Errors due to low power或Packet has bit Errors due to collision。