Mesh node stops beaconing

[HanneloreSchi]

Scenario:
+ multiple mesh nodes in proximity
+ NO data traffic on the network, only Mesh Peering frames

Problem:
One node simply stops beaconing.
I have no idea why so.

You can see, that 00:00:00:00:00:01 stops beaconing at about 2,5s and
won't send any again.

Output:
0: Mbps = 0
1: Mbps = 0
1301247280ns 00:00:00:00:00:06 is sending beacon
1321468725ns 00:00:00:00:00:05 is sending beacon
1633064088ns 00:00:00:00:00:01 is sending beacon
1670300147ns 00:00:00:00:00:02 is sending beacon
1801247280ns 00:00:00:00:00:06 is sending beacon
1821468725ns 00:00:00:00:00:05 is sending beacon
1887796932ns 00:00:00:00:00:03 is sending beacon
1970581626ns 00:00:00:00:00:04 is sending beacon
2: Mbps = 0
2133064088ns 00:00:00:00:00:01 is sending beacon
2170300147ns 00:00:00:00:00:02 is sending beacon
2301247280ns 00:00:00:00:00:06 is sending beacon
2321468725ns 00:00:00:00:00:05 is sending beacon
2387796932ns 00:00:00:00:00:03 is sending beacon
2470581626ns 00:00:00:00:00:04 is sending beacon
2670300147ns 00:00:00:00:00:02 is sending beacon
2801247280ns 00:00:00:00:00:06 is sending beacon
2821468725ns 00:00:00:00:00:05 is sending beacon
2887796932ns 00:00:00:00:00:03 is sending beacon
2970581626ns 00:00:00:00:00:04 is sending beacon
3: Mbps = 0
3132628136ns BeaconLoss -> link break to 00:00:00:00:00:01
3132628136ns BeaconLoss -> link break to 00:00:00:00:00:01
3132628156ns BeaconLoss -> link break to 00:00:00:00:00:01
3132628156ns BeaconLoss -> link break to 00:00:00:00:00:01
3132628185ns BeaconLoss -> link break to 00:00:00:00:00:01
3170300147ns 00:00:00:00:00:02 is sending beacon
3301247280ns 00:00:00:00:00:06 is sending beacon
3321468725ns 00:00:00:00:00:05 is sending beacon
3387796932ns 00:00:00:00:00:03 is sending beacon
3470581626ns 00:00:00:00:00:04 is sending beacon
3670300147ns 00:00:00:00:00:02 is sending beacon
3801247280ns 00:00:00:00:00:06 is sending beacon
3821468725ns 00:00:00:00:00:05 is sending beacon
3887796932ns 00:00:00:00:00:03 is sending beacon
3970581626ns 00:00:00:00:00:04 is sending beacon
4: Mbps = 0
4170300147ns 00:00:00:00:00:02 is sending beacon
4301247280ns 00:00:00:00:00:06 is sending beacon
4321468725ns 00:00:00:00:00:05 is sending beacon
4387796932ns 00:00:00:00:00:03 is sending beacon
4470581626ns 00:00:00:00:00:04 is sending beacon
4670300147ns 00:00:00:00:00:02 is sending beacon
4801247280ns 00:00:00:00:00:06 is sending beacon
4821468725ns 00:00:00:00:00:05 is sending beacon
4887796932ns 00:00:00:00:00:03 is sending beacon
4970581626ns 00:00:00:00:00:04 is sending beacon
5: Mbps = 0
5170300147ns 00:00:00:00:00:02 is sending beacon
5301247280ns 00:00:00:00:00:06 is sending beacon
5321468725ns 00:00:00:00:00:05 is sending beacon
5387796932ns 00:00:00:00:00:03 is sending beacon
5470581626ns 00:00:00:00:00:04 is sending beacon
5670300147ns 00:00:00:00:00:02 is sending beacon



Code Example:
#include "ns3/core-module.h"
#include "ns3/simulator-module.h"
#include "ns3/node-module.h"
#include "ns3/helper-module.h"
#include "ns3/global-routing-module.h"
#include "ns3/wifi-module.h"
#include "ns3/mesh-module.h"
#include "ns3/mobility-module.h"
#include "ns3/mesh-helper.h"


using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("TestMeshScript");

uint64_t m_bytesTotal=0;
Ptr<YansWifiChannel> ptrChannel;
NetDeviceContainer devCont;
MeshHelper mesh;
unsigned numReport=0;

void Report ()
{
unsigned n (0);
for (NetDeviceContainer::Iterator i = devCont.Begin (); i !=
devCont.End (); ++i, ++n) {
std::ostringstream os;
os << "simple-tcp-report-" << numReport << "-" << n << ".xml";
std::cerr << "Printing mesh point device #" << n << " diagnostics
to " << os.str () << "\n";
std::ofstream of;
of.open (os.str().c_str());
if (! of.is_open ()) {
std::cerr << "Error: Can't open file " << os.str() << "\n";
return;
}
mesh.Report (*i, of);
of.close ();
}

numReport++;
}

static void Throughput () // in Mbps calculated every 1s
{
const double timeunit = 1;

double mbps = (((m_bytesTotal * 8.0) / 1000000) / timeunit);
std::cerr << Simulator::Now().GetSeconds() << ": Mbps = " << mbps <<
std::endl;

Time time = Simulator::Now ();
m_bytesTotal = 0;

Simulator::Schedule (Seconds (timeunit), &Throughput);
}

void PhyRxOkTrace (std::string context, Ptr<const Packet> packet,
double snr,
WifiMode mode, enum WifiPreamble preamble)
{
Ptr<Packet> m_currentPacket;
WifiMacHeader hdr;
m_currentPacket = packet->Copy();
m_currentPacket->RemoveHeader (hdr);

if (hdr.IsData()) {
m_bytesTotal += m_currentPacket->GetSize ();
}
NS_LOG_DEBUG(context << " " << Simulator::Now().GetSeconds() << ": "
<< mode.GetDataRate() << " MBps");
}

int main (int argc, char *argv[])
{
const uint8_t numNodes = 6;
const uint8_t src1 = 1;
const uint8_t src2 = 5;
const uint8_t sink1 = 2;

// nodes
NodeContainer nodes;
nodes.Create(numNodes);

// PHY & channel
const uint8_t smartAntennaGain = 9;
YansWifiPhyHelper phy = YansWifiPhyHelper::Default();
YansWifiChannelHelper channel = YansWifiChannelHelper::Default();
ptrChannel = channel.Create();

phy.SetChannel(ptrChannel);

// mobility
MobilityHelper mobi;
Ptr<ListPositionAllocator> positionAlloc =
CreateObject<ListPositionAllocator> ();
const double baselen = 10.426406871192851464050661726291;
positionAlloc->Add(Vector(baselen, 0., 0.));
positionAlloc->Add(Vector(3*baselen, 0., 0.));
positionAlloc->Add(Vector(0., baselen, 0.));
positionAlloc->Add(Vector(2*baselen, baselen, 0.));
positionAlloc->Add(Vector(baselen, 2*baselen, 0.));
positionAlloc->Add(Vector(3*baselen, 2*baselen, 0.));
mobi.SetPositionAllocator(positionAlloc);
mobi.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
mobi.Install (nodes);

mesh = MeshHelper::Default();
mesh.SetStackInstaller("ns3::Dot11sStack");
mesh.SetRemoteStationManager("ns3::IdealWifiManager");
mesh.SetMacType("RandomStart", TimeValue(Seconds(2)));
devCont = mesh.Install(phy, nodes);

// TCP/IP stack
InternetStackHelper netStack;
netStack.Install(nodes);

// IPs
Ipv4AddressHelper addresses;
addresses.SetBase ("10.1.1.0", "255.255.255.0");
Ipv4InterfaceContainer interfaceCont;
interfaceCont = addresses.Assign(devCont);

// Applications
// none

// HWMP report
Simulator::Schedule (Seconds(12), & Report);

//LogComponentEnable("DcfManager", LogLevel(LOG_LEVEL_DEBUG|
LOG_PREFIX_NODE|LOG_PREFIX_TIME|LOG_PREFIX_FUNC));
//LogComponentEnable("OnOffApplication", LogLevel(LOG_LEVEL_DEBUG|
LOG_PREFIX_NODE|LOG_PREFIX_TIME|LOG_PREFIX_FUNC));
//LogComponentEnable("HwmpRtable", LogLevel(LOG_LEVEL_DEBUG|
LOG_PREFIX_NODE|LOG_PREFIX_TIME|LOG_PREFIX_FUNC));
//LogComponentEnable("AirtimeLinkMetricCalculator",
LogLevel(LOG_LEVEL_DEBUG|LOG_PREFIX_TIME|LOG_PREFIX_NODE|
LOG_PREFIX_FUNC));
LogComponentEnable("Dot11sPeerManagementProtocol",
LogLevel(LOG_LEVEL_DEBUG|LOG_PREFIX_TIME|LOG_PREFIX_NODE|
LOG_PREFIX_FUNC));
LogComponentEnable("MeshWifiInterfaceMac", LogLevel(LOG_LEVEL_DEBUG|
LOG_PREFIX_TIME|LOG_PREFIX_NODE|LOG_PREFIX_FUNC));
//LogComponentEnable("DcaTxop", LogLevel(LOG_LEVEL_DEBUG|
LOG_PREFIX_TIME|LOG_PREFIX_NODE|LOG_PREFIX_FUNC));
//LogComponentEnable("HwmpProtocolMac", LogLevel(LOG_LEVEL_DEBUG|
LOG_PREFIX_TIME|LOG_PREFIX_NODE|LOG_PREFIX_FUNC));
//LogComponentEnable("HwmpProtocol", LogLevel(LOG_LEVEL_DEBUG|
LOG_PREFIX_TIME|LOG_PREFIX_NODE|LOG_PREFIX_FUNC));
//LogComponentEnable("YansWifiChannel", LogLevel(LOG_LEVEL_DEBUG|
LOG_PREFIX_TIME|LOG_PREFIX_NODE|LOG_PREFIX_FUNC));
//LogComponentEnable("WifiRemoteStationManager",
LogLevel(LOG_LEVEL_DEBUG|LOG_PREFIX_TIME|LOG_PREFIX_NODE|
LOG_PREFIX_FUNC));
//LogComponentEnable("SmartantennaCrWifiManager",
LogLevel(LOG_LEVEL_DEBUG|LOG_PREFIX_TIME|LOG_PREFIX_NODE|
LOG_PREFIX_FUNC));
//LogComponentEnable("SmartAntennaIdealWifiManager",
LogLevel(LOG_LEVEL_DEBUG|LOG_PREFIX_TIME|LOG_PREFIX_NODE|
LOG_PREFIX_FUNC));
//LogComponentEnable("PeerManagementProtocol",
LogLevel(LOG_LEVEL_DEBUG|LOG_LEVEL_LOGIC|LOG_PREFIX_TIME|
LOG_PREFIX_NODE|LOG_PREFIX_FUNC));
//LogComponentEnable("PeerManagementProtocolMac",
LogLevel(LOG_LEVEL_DEBUG|LOG_LEVEL_LOGIC|LOG_PREFIX_TIME|
LOG_PREFIX_NODE|LOG_PREFIX_FUNC));
//LogComponentEnable("TestMeshScript", LogLevel(LOG_LEVEL_DEBUG|
LOG_PREFIX_NODE|LOG_PREFIX_TIME|LOG_PREFIX_FUNC));
//LogComponentEnable("YansWifiPhy", LogLevel(LOG_LEVEL_DEBUG|
LOG_PREFIX_TIME|LOG_PREFIX_NODE|LOG_PREFIX_FUNC));
//LogComponentEnable("InterferenceHelper", LogLevel(LOG_LEVEL_DEBUG|
LOG_PREFIX_TIME|LOG_PREFIX_NODE|LOG_PREFIX_FUNC));
//LogComponentEnable("MacLow", LogLevel(LOG_LEVEL_DEBUG|
LOG_PREFIX_TIME|LOG_PREFIX_NODE|LOG_PREFIX_FUNC));

Config::Connect ("/NodeList/0/DeviceList/*/Phy/State/RxOk",
MakeCallback(&PhyRxOkTrace));
Throughput();

// pcap
//phy.EnablePcapAll("simple-tcp", false);

Simulator::Stop(Seconds(12));
Simulator::Run();
Simulator::Destroy();
}

[Kirill And]

Hi!

I have tested your scenario, this is a bug of a beacon collision avoidance

Try not to shift beacons (remove all lines from MeshWifiInterfaceMac::ShiftBeacon), this must help

I will try to fix it as soon as possible.

2010/10/18 HanneloreSchi <m.pors...@web.de>

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Regards, Kirill Andreev
Wireless Software R&D Group,
IITP RAS

[HanneloreSchi]

Thanks for your reply.
I assume you meant commenting out the content of
PeerManagementProtocol::DoShiftBeacon, when you wrote

> Try not to shift beacons (remove all lines from
> MeshWifiInterfaceMac::ShiftBeacon), this must help

because at first sight this seems to solve the problem.

Regards

On 19 Okt., 09:41, Kirill And <and.kir...@gmail.com> wrote:
> Hi!
> I have tested your scenario, this is a bug of a beacon collision avoidance
> Try not to shift beacons (remove all lines from
> MeshWifiInterfaceMac::ShiftBeacon), this must help
>
> I will try to fix it as soon as possible.
>

> 2010/10/18 HanneloreSchi <m.porsch3...@web.de>

> > }...
>
> Erfahren Sie mehr »

[Kirill And]

Hi!

I have also posted a bug with a proposed fix about this problem.