C++ definition

The default implementation of IContention.

Inheritance diagram

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

Extends

Name	Type	Description
SimpleModule	simple module	Base module for all INET simple modules.

Parameters

Name	Type	Default value	Description
displayStringTextFormat	string	""	Determines the text that is written on top of the submodule, supports displaying pars, watches, and module-specific information
initialChannelBusy	bool	true	Assume that the 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 maybe able to start transmitting immediately

Properties

Name	Value	Description
class	Contention
display	i=block/timer
defaultStatistic	stateChanged:vector

Signals

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

Statistics

Name	Title	Source	Record	Unit	Interpolation Mode	Description
backoffActive	backoff active	warmup(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 extends SimpleModule like IContention
{
    parameters:
        @class(Contention);
        bool initialChannelBusy = default(true); // Assume that the 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 maybe 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; enum=inet::ieee80211::Contention::State);
        @statistic[backoffPeriodGenerated](title="backoff periods"; record=vector; interpolationmode=none);
        @statistic[backoffActive](title="backoff active"; source=warmup(count(backoffStarted)-count(backoffStopped)); record=vector; interpolationmode=sample-hold; autoWarmupFilter=false);
        @statistic[channelAccessGranted](title="channel access granted"; record=count,vector?);
        @statistic[stateChanged](title="contention state changed"; type=enum; enum=IDLE,DEFER,IFS_AND_BACKOFF; record=count,vector; interpolationmode=none);
        @defaultStatistic(stateChanged:vector);
}

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

---

This documentation is released under the Creative Commons license