Package: inet.linklayer.ieee80211.mac.ratecontrol

AarfRateControl

simple module

References:

[1] https://www.eecs.yorku.ca/course_archive/2010-11/F/6590/Notes/RBAR.pdf

"However, there is a clear threshold region in the 40ms-60ms range, depending on the degree of mobility, beyond which there is little performance change but below which there is a noticeable drop."

Inheritance diagram

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

Known subclasses

Name	Type	Description
ArfRateControl	simple module	(no description)

Parameters

Name	Type	Default value	Description
initialRate	double	-1bps	-1 means fastest mandatory rate
interval	double	50ms	The rate (unconditionally) increases after each time interval (the default interval is unspecified [2]).
increaseThreshold	int	10	Number of successful transmissions needed to increase the rate
decreaseThreshold	int	2	Number of consecutive unsuccessful transmissions (in the sense that ACK does not arrive within timeout) needed to increase the rate
increaseThresholdFactor	double	2	When the transmission of probing packet fails, we multiply by "increaseThresholdFactor" the increaseThreshold.
maxIncreaseThreshold	int	50	Upper bound for increaseThreshold.

Properties

Name	Value	Description
display	i=block/cogwheel

Signals

Name	Type	Unit
datarateChanged

Statistics

Name	Title	Source	Record	Unit	Interpolation Mode
datarateChanged	datarate		vector		sample-hold

Direct method calls (observed)

call to	function	info
Ieee80211Interface	inet::NetworkInterface::receiveSignal	POST_MODEL_CHANGE

Called methods (observed)

function	info	call from
inet::ieee80211::AarfRateControl::getRate	getRate	Dcf
inet::ieee80211::AarfRateControl::receiveSignal	modesetChanged	Ieee80211Mac

Source code

// References:
// - [1] https://www.eecs.yorku.ca/course_archive/2010-11/F/6590/Notes/RBAR.pdf
//
//    "However, there is a clear threshold region in the 40ms-60ms
//    range, depending on the degree of mobility, beyond which
//    there is little performance change but below which there is a
//    noticeable drop."
//
simple AarfRateControl like IRateControl
{
    parameters:
        double initialRate @unit(bps) = default(-1bps); // -1 means fastest mandatory rate
        double interval @unit(s) = default(50ms); // The rate (unconditionally) increases after each time interval (the default interval is unspecified [2]).
        int increaseThreshold = default(10); // Number of successful transmissions needed to increase the rate
        int decreaseThreshold = default(2); // Number of consecutive unsuccessful transmissions (in the sense that ACK does not arrive within timeout)
                                            // needed to increase the rate
        double increaseThresholdFactor = default(2); // When the transmission of probing packet fails, we multiply by "increaseThresholdFactor" the increaseThreshold.
        int maxIncreaseThreshold = default(50); // Upper bound for increaseThreshold.
        @display("i=block/cogwheel");
        @signal[datarateChanged];
        @statistic[datarateChanged](title="datarate"; record=vector; interpolationmode=sample-hold);
}

File: src/inet/linklayer/ieee80211/mac/ratecontrol/AarfRateControl.ned