DevAP Class Reference

The Access Point class. More...

#include <devAP.h>

Inherits DEDevice.

Inheritance diagram for DevAP:

[legend]Collaboration diagram for DevAP:

[legend]List of all members.

Public Member Functions
void	Initialize ()
	Initialize function.
	DevAP (DESystem *_System)
	Contructor.
virtual const char *	Type () const
	This will allow the events and such to print debugging informations in a meaningful way.
void	HEv_AP_Packet_Arrival (DevPkt *sender)
	Handler for the Ev_AP_Packet_Arrival event.
void	HEv_AP_SelfCheck ()
	Handler for the Ev_AP_SelfCheck event.
Static Public Member Functions
void	setup (ParamManager *Param, GlobalProbeManager *Results)
	Setup function, where the parameters are defined.
Protected Attributes
DETime	halfSlot
	DETime creation is slow, better to mem it and keep.
list< DevPkt * >	queue
	the list of the packets recived in a given slot.
DETime	RoundTripDelay
	the time needed to send back the answer to the DevPkt.
ProbeBand *	theBandProbe
	probe for the long term throughput. Dynamically created.
ProbeBandSlice *	theBandSliceProbe
	probe for the short term throughput. Dynamically created.

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Detailed Description

The Access Point class.

This class will detect the collisions and will send the acknowledgment to the sender.

Note that it is impossible to 'see' how many events of a given type are in the NePSing scheduling queus for a given time, as they will be executed sequentially even if they have the same execution time. Hence, in order to detect a collision you must first collect the data about how many packets have been sent in a given slot and then process tham at a later time (usually half slot later).

A special note about the timings: NePSing events have an execution time (i.e., when they will be executed), but no duration. Hence, any event is executed instantaneously. To simulate a duration, a special care must be taken and the solution have to be tailored to your particular needs. See the DEEvent documentation for meore about this.

Definition at line 35 of file devAP.h.

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Constructor & Destructor Documentation

DevAP::DevAP (  DESystem *  _System  )

Contructor. Remember to clear variables for initialization in Initialize(). Do NOT initialize variables here unless they are constants. Definition at line 17 of file devAP.cpp. References halfSlot, theBandProbe, theBandSliceProbe, and time_int. : DEDevice(_System) { theBandProbe = 0; theBandSliceProbe = 0; halfSlot = DETime(time_int(1), time_int(0), time_int(0)) / 2; };

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Member Function Documentation

void DevAP::HEv_AP_Packet_Arrival (  DevPkt *  sender  )

Handler for the Ev_AP_Packet_Arrival event. This function is called when a packet arrives. It must store every packet in a list to check later if there was a collision. To do it, the Ev_AP_SelfCheck event is called. Only one Ev_AP_SelfCheck event must be generated, so the event generation is checked against the packet queue. Definition at line 58 of file devAP.cpp. References halfSlot, DEDevice::newEvent(), and queue. { if( queue.empty() ) newEvent(new Ev_AP_SelfCheck(this), halfSlot ); queue.push_back(sender); }

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void DevAP::HEv_AP_SelfCheck (   )

Handler for the Ev_AP_SelfCheck event. This function does the actual collision check. If a collision occurs, a NACK is issued, otherwise an ACK is sent. If the packet is successfully transmitted, it is also measured the network throughput. Definition at line 71 of file devAP.cpp. References DEDevice::newEvent(), ProbeBandSlice::Observe(), ProbeBand::Observe(), queue, RoundTripDelay, theBandProbe, and theBandSliceProbe. { if( queue.size() == 1 ) { // no collision newEvent(new Ev_Pkt_Feedback(queue.front(), 0), RoundTripDelay ); theBandProbe->Observe(1.0); theBandSliceProbe->Observe(1.0); } else { // collisions list<DevPkt*>::iterator dtListIter; for( dtListIter=queue.begin(); dtListIter!=queue.end(); dtListIter++) newEvent(new Ev_Pkt_Feedback(*dtListIter, 1), RoundTripDelay ); } queue.clear(); }

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void DevAP::Initialize (   )  [virtual]

Initialize function. Here is where the parameters are read and the real initialization takes place. Note (again) that this function can be called multiple times; hence, you must clear previous instances. Reimplemented from DEDevice. Definition at line 37 of file devAP.cpp. References queue, RoundTripDelay, theBandProbe, and theBandSliceProbe. Referenced by SysSAloha::Initialize(). { RoundTripDelay = get<DETimeParameter,DETime>(Param, "RoundTripDelay", "SAloha", ""); queue.clear(); if( theBandProbe ) delete( theBandProbe ); theBandProbe = new ProbeBand( "theBand" ); if( theBandSliceProbe ) delete( theBandSliceProbe ); theBandSliceProbe = new ProbeBandSlice( "theBandSlice" ); }

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The documentation for this class was generated from the following files:

• devAP.h
• devAP.cpp

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