Dcaf¶

Package: inet.linklayer.ieee80211.mac.channelaccess

compound module Dcaf

Implements the DCAF (Distributed Channel Access Function) for IEEE 802.11.

Usage diagram¶

Inheritance diagram¶

Used in compound modules¶

Name	Type	Description
Dcf	compound module	Implements the DCF (Distributed Coordination Function) for IEEE 802.11.

Extends¶

Name	Type	Description
Module	compound module	Base module for all INET compound modules.

Parameters¶

Name	Type	Default value	Description
displayStringTextFormat	string	“{contentionState}”	Determines the text that is written on top of the submodule, supports displaying pars, watches, and module-specific information
difsn	int	-1
cwMin	int	-1
cwMax	int	-1
rxModule	string

Properties¶

Name	Value	Description
class	Dcaf
display	i=block/star

Signals¶

Name	Type	Unit	Description
channelOwnershipChanged	bool

Statistics¶

Name	Title	Source	Record	Unit	Interpolation Mode	Description
channelOwnershipChanged	channel ownership		count,vector?		sample-hold

Unassigned submodule parameters¶

Name	Type	Default value	Description
pendingQueue.displayStringTextFormat	string	“contains %p pk (%l) pushed %u\npulled %o removed %r dropped %d”	Determines the text that is written on top of the submodule, supports displaying pars, watches, and module-specific information
pendingQueue.packetCapacity	int	100	Maximum number of packets in the queue, no limit by default
pendingQueue.dataCapacity	int	-1b	Maximum total length of packets in the queue, no limit by default
pendingQueue.dropperClass	string	“inet::queueing::PacketAtCollectionEndDropper”	Determines which packets are dropped when the queue is overloaded, packets are not dropped by default; the parameter must be the name of a C++ class which implements the IPacketDropperFunction C++ interface and is registered via Register_Class
pendingQueue.comparatorClass	string	“inet::ieee80211::MgmtOverDataComparator”	Determines the order of packets in the queue, insertion order by default; the parameter must be the name of a C++ class which implements the IPacketComparatorFunction C++ interface and is registered via Register_Class
pendingQueue.bufferModule	string	“”	Relative module path to the IPacketBuffer module used by this queue, implicit buffer by default
inProgressFrames.displayStringTextFormat	string	“{numInProgress} packets”	Determines the text that is written on top of the submodule, supports displaying pars, watches, and module-specific information
inProgressFrames.pendingQueueModule	string	“^.pendingQueue”
inProgressFrames.originatorMacDataServiceModule	string	“^.^.originatorMacDataService”
inProgressFrames.ackHandlerModule	string	“^.^.ackHandler”
contention.displayStringTextFormat	string	“{fsmState}”	Determines the text that is written on top of the submodule, supports displaying pars, watches, and module-specific information
contention.initialChannelBusy	bool	true	Assume that the channel was busy before the simulation started
contention.backoffOptimization	bool	true	We can pretend the frame has arrived into the queue a little bit earlier, and maybe able to start transmitting immediately

Source code¶

//
// Implements the DCAF (Distributed Channel Access Function) for IEEE 802.11.
//
module Dcaf extends Module
{
    parameters:
        int difsn = default(-1);
        int cwMin = default(-1);
        int cwMax = default(-1);
        string rxModule;
        @class(Dcaf);
        displayStringTextFormat = default("{contentionState}");
        @display("i=block/star");
        @signal[channelOwnershipChanged](type=bool);
        @statistic[channelOwnershipChanged](title="channel ownership"; record=count,vector?; interpolationmode=sample-hold);
    submodules:
        pendingQueue: <default("PendingQueue")> like IPacketQueue {
            parameters:
                @display("p=100,100");
        }
        inProgressFrames: InProgressFrames {
            parameters:
                pendingQueueModule = default("^.pendingQueue");
                originatorMacDataServiceModule = default("^.^.originatorMacDataService");
                ackHandlerModule = default("^.^.ackHandler");
                @display("p=100,200");
        }
        contention: <default("Contention")> like IContention {
            parameters:
                @display("p=100,300");
        }
}

File: src/inet/linklayer/ieee80211/mac/channelaccess/Dcaf.ned