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

Usage diagram

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

Used in compound modules

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

Parameters

Name	Type	Default value	Description
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
channelOwnershipChanged	bool

Statistics

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

Direct method calls (observed)

call to	function	info
Contention	inet::ieee80211::Contention::mediumStateChanged	medium BUSY
Contention	inet::ieee80211::Contention::mediumStateChanged	medium FREE
Contention	inet::ieee80211::Contention::startContention	startContention
Dcf	inet::ieee80211::Dcf::channelGranted	channelGranted

Called methods (observed)

function	info	call from
inet::ieee80211::Dcaf::channelAccessGranted	channelAccessGranted	Contention
inet::ieee80211::Dcaf::incrementCw	incrementCw	Dcf
inet::ieee80211::Dcaf::receiveSignal	modesetChanged	Ieee80211Mac
inet::ieee80211::Dcaf::releaseChannel	releaseChannel	Dcf
inet::ieee80211::Dcaf::requestChannel	requestChannel	Dcf
inet::ieee80211::Dcaf::resetCw	resetCw	Dcf

Unassigned submodule parameters

Name	Type	Default value	Description
inProgressFrames.pendingQueueModule	string	"^.pendingQueue"
inProgressFrames.originatorMacDataServiceModule	string	"^.^.originatorMacDataService"
inProgressFrames.ackHandlerModule	string	"^.^.ackHandler"

Source code

//
// Implements the DCAF (Distributed Channel Access Function) for IEEE 802.11.
//
module Dcaf
{
    parameters:
        int difsn = default(-1);
        int cwMin = default(-1);
        int cwMax = default(-1);
        string rxModule;
        @class("Dcaf");
        @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

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