The default implementation of IContention.

Inheritance diagram

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

Parameters

Name	Type	Default value	Description
initialChannelBusy	bool	true	assume that channel was busy before the simulation started
backoffOptimization	bool	true	we can pretend the frame has arrived into the queue a little bit earlier, and may be able to start transmitting immediately

Properties

Name	Value	Description
display	i=block/timer

Signals

Name	Type	Unit
channelAccessGranted
backoffStarted	simtime_t
backoffStopped	simtime_t
backoffPeriodGenerated	long
stateChanged	long

Statistics

Name	Title	Source	Record	Unit	Interpolation Mode
backoffActive	backoff active	count(backoffStarted)-count(backoffStopped)	vector		sample-hold
channelAccessGranted	channel access granted		count, vector?
backoffPeriodGenerated	backoff periods		vector		none
stateChanged	contention state changed		count, vector?		none

Source code

//
// The default implementation of IContention.
//
simple Contention like IContention
{
    parameters:
        bool initialChannelBusy = default(true); // assume that channel was busy before the simulation started
        bool backoffOptimization = default(true);    // we can pretend the frame has arrived into the queue a little bit earlier, and may be able to start transmitting immediately
        @display("i=block/timer");
        @signal[backoffPeriodGenerated](type=long);
        @signal[backoffStarted](type=simtime_t);
        @signal[backoffStopped](type=simtime_t);
        @signal[channelAccessGranted];
        @signal[stateChanged](type=long); // TODO: enum=inet::ieee80211::Contention::State
        @statistic[backoffPeriodGenerated](title="backoff periods"; record=vector; interpolationmode=none);
        @statistic[backoffActive](title="backoff active"; source=count(backoffStarted)-count(backoffStopped); record=vector; interpolationmode=sample-hold);
        @statistic[channelAccessGranted](title="channel access granted"; record=count,vector?);
        @statistic[stateChanged](title="contention state changed"; record=count,vector?; interpolationmode=none);
}

File: src/inet/linklayer/ieee80211/mac/contention/Contention.ned

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