mac802.11p

[Forough]

Hi all

I work with veins 2.2 and sumo-0.19.0 . there is problem with mac80211p that the channel never returns to idel state after the first transmission. in this way every vehicle can transmit only 1 packet in every 50 ms of channel duration. how can I solve this problem?

best regards
Forough

[Christoph Sommer]

just for completeness: This question has been asked on StackOverflow as
well:

http://stackoverflow.com/questions/32224924/mac802-11p-or-decider8011p-error

Best,

Christoph



--
Dr. Christoph Sommer
Distributed Embedded Systems Group
University of Paderborn, Germany
http://www.ccs-labs.org/~sommer/

[Forough]

Hi and thank you for your help
this is the .ned file:

package multichannel;
import org.mixim.base.modules.BaseArp;
import org.mixim.base.modules.BaseNetwLayer;
import org.mixim.base.modules.IMobility;
//import org.mixim.modules.application.ieee80211p.TestWaveApplLayer;
import org.mixim.modules.nic.Nic80211p;
module car
{
    parameters:
        string mobilityType;

        @display("bgb=366,359");
    gates:
        input radioIn;
    submodules:
        mobility: <mobilityType> like IMobility {
            @display("p=332,315");
        }
        nic: Nic80211p {
            @display("p=94,239");
        }
        applayer: C_TestWaveApplLayer {
            @display("p=94,169");
        }
    connections allowunconnected:
        radioIn --> nic.radioIn;
        applayer.lowerControlIn <-- nic.upperControlOut;
        applayer.lowerControlOut --> nic.upperControlIn;
        applayer.lowerLayerIn <-- nic.upperLayerOut;
        applayer.lowerLayerOut --> nic.upperLayerIn;
}


 the .cc file for application layer is:

#include "TestWaveApplLayer.h"
#include "mobility/traci/TraCIScenarioManager.h"
#include "mobility/traci/TraCIMobility.h"

class C_TestWaveApplLayer : public TestWaveApplLayer

{
public:

        virtual void finish();
        virtual void handleSelfMsg(cMessage* msg);
};

Define_Module(C_TestWaveApplLayer);


void C_TestWaveApplLayer::handleSelfMsg(cMessage* msg) {
    switch (msg->getKind()) {
        case SEND_BEACON_EVT: {
            sendWSM(prepareWSM("beacon", beaconLengthBits, type_CCH, beaconPriority, 0, -1));
            scheduleAt(simTime() + uniform(-0.0005,0.0005)+ par("beaconInterval").doubleValue(), sendBeaconEvt);
            break;

        }
        default: {
            if (msg)
                DBG << "APP: Error: Got Self Message of unknown kind! Name: " << msg->getName() << endl;
            break;
        }
    }
}
void C_TestWaveApplLayer::finish() {
 

       TestWaveApplLayer::finish();
       recordScalar("numberofbeacon", receivedBeacons);


        }

then after running the simulation the totalBusyTime for every node is almost half of the simulation time. because the following part of the code in Decider80211p.cc never returns the channel state as idle:

simtime_t Decider80211p::processSignalEnd(AirFrame* msg) {
.
.

    //check if channel is idle now
 
    else if (cca(simTime(), frame) == false) {
        DBG_D11P << "Channel not yet idle!\n";

    }
.
.
.

[Forough]

Dear Christoph
I still have the same problem and I can not solve it. can you please help me.

best regards
Forough

On Thursday, 27 August 2015 09:32:55 UTC+1, Christoph Sommer wrote: