BMac

compound module

Implementation of B-MAC (called also Berkeley MAC, Low Power Listening or LPL). See C++ documentation for details.

Inheritance diagram

The following diagram shows inheritance relationships for this type. Unresolved types are missing from the diagram.

Extends

Name	Type	Description
MacProtocolBase	simple module	Module base for different MAC protocols.

Parameters

Name	Type	Default value	Description
interfaceTableModule	string
address	string	"auto"	MAC address as hex string (12 hex digits), or "auto". "auto" values will be replaced by a generated MAC address in init stage 0.
slotDuration	double	0.1s	BMAC specific parameters how long is one slot?
headerLength	int	10b
ctrlFrameLength	int	headerLength
mtu	int	0B
checkInterval	double	0.01s	how long is the check interval (CCA)?
animation	bool	true	should we animate the nodes with colors depending on their state or not?
bitrate	double	19200 bps	bit rate
useMACAcks	bool	false	should mac send and expect acknowledgments?
radioModule	string	"^.radio"	The path to the Radio module //FIXME remove default value
maxTxAttempts	int	2	Maximum transmission attempts per data packet, when ACKs are used

Properties

Name	Value	Description
display	i=block/rxtx
class	BMac
selfMessageKinds	inet::BMacType

Gates

Name	Direction	Size	Description
upperLayerIn	input
upperLayerOut	output
lowerLayerIn	input
lowerLayerOut	output

Signals

Name	Type	Unit
linkBroken	inet::Packet

Statistics

Name	Title	Source	Record	Interpolation Mode
packetDropNotAddressedToUs	packet drop: not addressed to us	packetDropReasonIsNotAddressedToUs(packetDropped)	count, sum(packetBytes), vector(packetBytes)	none
packetDropQueueOverflow	packet drop: queue overflow	packetDropReasonIsQueueOverflow(packetDropped)	count, sum(packetBytes), vector(packetBytes)	none
linkBroken	link break	linkBroken	count	none
packetDropIncorrectlyReceived	packet drop: incorrectly received	packetDropReasonIsIncorrectlyReceived(packetDropped)	count, sum(packetBytes), vector(packetBytes)	none

Scheduled messages (observed)

msg	kind	tags	msgname
Packet	192 (BMacType::BMAC_DATA)	ErrorRateInd, PacketProtocolTag, SignalPowerInd, SignalTimeInd, SnirInd	pingNN
omnetpp::cMessage	196 (BMacType::BMAC_START_BMAC)		start_bmac
omnetpp::cMessage	197 (BMacType::BMAC_WAKE_UP)		wakeup
omnetpp::cMessage	199 (BMacType::BMAC_CCA_TIMEOUT)		cca_timeout
omnetpp::cMessage	201 (BMacType::BMAC_SEND_PREAMBLE)		send_preamble
omnetpp::cMessage	202 (BMacType::BMAC_STOP_PREAMBLES)		stop_preambles
omnetpp::cMessage	203 (BMacType::BMAC_DATA_TX_OVER)		data_tx_over
omnetpp::cMessage	204 (BMacType::BMAC_DATA_TIMEOUT)		data_timeout

Direct method calls (observed)

call to	function	info
MessageDispatcher	inet::MessageDispatcher::arrived	arrived
PcapRecorder	inet::PcapRecorder::receiveSignal	packetReceivedFromLower
PcapRecorder	inet::PcapRecorder::receiveSignal	packetSentToLower
InterfaceTable	inet::InterfaceTable::interfaceChanged	interfaceChanged
ApskDimensionalRadio	inet::physicallayer::ApskRadio::setRadioMode	setRadioMode
ApskScalarRadio	inet::physicallayer::ApskRadio::setRadioMode	setRadioMode
UnitDiskRadio	inet::physicallayer::UnitDiskRadio::setRadioMode	setRadioMode
DropTailQueue	inet::queueing::PacketQueue::pullPacket	pullPacket

Called methods (observed)

function	info	call from
inet::BMac::handleCanPullPacketChanged	handleCanPullPacketChanged	DropTailQueue
inet::BMac::receiveSignal	radioModeChanged	ApskDimensionalRadio, ApskScalarRadio, UnitDiskRadio
inet::BMac::receiveSignal	transmissionStateChanged	ApskDimensionalRadio, ApskScalarRadio, UnitDiskRadio

Incoming messages (observed)

gate	msg	srcModule	tags
lowerLayerIn	Packet	ApskDimensionalRadio	ErrorRateInd, PacketProtocolTag, SignalPowerInd, SignalTimeInd, SnirInd
lowerLayerIn	Packet	ApskScalarRadio	ErrorRateInd, PacketProtocolTag, SignalPowerInd, SignalTimeInd, SnirInd
lowerLayerIn	Packet	UnitDiskRadio	ErrorRateInd, PacketProtocolTag, SignalPowerInd, SignalTimeInd, SnirInd

Outgoing messages (observed)

gate	msg	destModule	tags
lowerLayerOut	Packet	ApskDimensionalRadio	PacketProtocolTag, InterfaceReq?, MacAddressReq?
lowerLayerOut	Packet	ApskScalarRadio	PacketProtocolTag, DispatchProtocolInd?, InterfaceReq?, MacAddressReq?, MulticastReq?, NetworkProtocolInd?, TransportProtocolInd?
lowerLayerOut	Packet	UnitDiskRadio	PacketProtocolTag, DispatchProtocolInd?, InterfaceReq?, MacAddressReq?, NetworkProtocolInd?, SocketReq?
upperLayerOut	Packet	Arp	DispatchProtocolReq, ErrorRateInd, InterfaceInd, MacAddressInd, PacketProtocolTag, SignalPowerInd, SignalTimeInd, SnirInd
upperLayerOut	Packet	Ipv4	DispatchProtocolReq, ErrorRateInd, InterfaceInd, MacAddressInd, PacketProtocolTag, SignalPowerInd, SignalTimeInd, SnirInd

Pull in messages (observed)

gate	msg	kind	ctrl	srcModule	tags
upperLayerIn	Packet	0		DropTailQueue	InterfaceReq, MacAddressReq, PacketProtocolTag, DispatchProtocolInd?, MulticastReq?, NetworkProtocolInd?, SocketReq?, TransportProtocolInd?

Packet operations (observed)

chunkType	packetAction
BMacControlFrame	insertAtFront
BMacDataFrameHeader	insertAtFront, peekAtFront, popAtFront
BMacHeaderBase	peekAtFront

Shared Tagging operations (observed)

tagType	tagAction
DispatchProtocolReq	addTagIfAbsent
InterfaceInd	addTagIfAbsent
MacAddressInd	addTagIfAbsent
MacAddressReq	getTag
PacketProtocolTag	addTag, addTagIfAbsent, getTag

Source code

//
// Implementation of B-MAC (called also Berkeley MAC, Low Power Listening or
// LPL).
// See C++ documentation for details.
//
module BMac extends MacProtocolBase like IMacProtocol
{
    parameters:
        string address @mutable = default("auto"); // MAC address as hex string (12 hex digits), or
                                                   // "auto". "auto" values will be replaced by
                                                   // a generated MAC address in init stage 0.
        // BMAC specific parameters
        // how long is one slot?
        double slotDuration @unit(s) = default(0.1s);

        int headerLength @unit(b) = default(10b);
        int ctrlFrameLength @unit(b) = default(headerLength);
        int mtu @unit(B) = default(0B);

        // how long is the check interval (CCA)?
        double checkInterval @unit(s) = default(0.01s);

        // should we animate the nodes with colors depending on their state or
        // not?
        bool animation = default(true);

        // bit rate
        double bitrate @unit(bps) = default(19200 bps);

        //should mac send and expect acknowledgments?
        bool useMACAcks = default(false);

        string radioModule = default("^.radio");   // The path to the Radio module  //FIXME remove default value

        int maxTxAttempts = default(2);     //  Maximum transmission attempts per data packet, when ACKs are used

        @class(BMac);
        @signal[linkBroken](type=inet::Packet);
        @statistic[linkBroken](title="link break"; source=linkBroken; record=count; interpolationmode=none);
        @statistic[packetDropIncorrectlyReceived](title="packet drop: incorrectly received"; source=packetDropReasonIsIncorrectlyReceived(packetDropped); record=count,sum(packetBytes),vector(packetBytes); interpolationmode=none);
        @statistic[packetDropNotAddressedToUs](title="packet drop: not addressed to us"; source=packetDropReasonIsNotAddressedToUs(packetDropped); record=count,sum(packetBytes),vector(packetBytes); interpolationmode=none);
        @statistic[packetDropQueueOverflow](title="packet drop: queue overflow"; source=packetDropReasonIsQueueOverflow(packetDropped); record=count,sum(packetBytes),vector(packetBytes); interpolationmode=none);

        @selfMessageKinds(inet::BMacType);
}

File: src/inet/linklayer/bmac/BMac.ned