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

Usage diagram

The following diagram shows usage relationships between types. Unresolved types are missing from the diagram.

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?
macMaxFrameRetries	int	3	maximum number of frame retransmission only used when usage of MAC acks is enabled
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	Unit	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

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 = 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);
        // maximum number of frame retransmission
        // only used when usage of MAC acks is enabled
        int macMaxFrameRetries = default(3);

        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);
    submodules:
        queue: <default("DropTailQueue")> like IPacketQueue {
            parameters:
                packetCapacity = default(20);
                @display("p=100,100;q=l2queue");
        }
}

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

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