AlohaMacLayer Class Reference
[macLayer - MAC layer modules]

MAC module which provides pure Aloha. More...

#include <AlohaMacLayer.h>

Inherits BasicMacLayer.

Inheritance diagram for AlohaMacLayer:

[legend]Collaboration diagram for AlohaMacLayer:

[legend]List of all members.

Public Member Functions
	Module_Class_Members (AlohaMacLayer, BasicMacLayer, 0)
virtual void	initialize (int)
	Initialization of the module and some variables.
virtual void	finish ()
	Delete all dynamically allocated objects of the module.
virtual void	handleUpperMsg (cMessage *)
	Handle messages from upper layer.
virtual void	handleSelfMsg (cMessage *)
	Handle self messages such as timers.
virtual void	handleLowerControl (cMessage *msg)
	Handle control messages from lower layer.
virtual void	receiveBBItem (int category, const BBItem *details, int scopeModuleId)
	Called by the Blackboard whenever a change occurs we're interested in.
Protected Types
typedef std::list< MacPkt * >	MacQueue
enum	States { RX, TX }
	MAC states. More...
Protected Member Functions
void	prepareSend ()
	Prepare sending of a packet (switch the radio).
Protected Attributes
States	macState
	kepp track of MAC state
RadioState::States	radioState
	Current state of active channel (radio), set using radio, updated via BB.
int	catRadioState
	category number given by bb for RadioState
SingleChannelRadio *	radio
	cached pointer to radio module
MacQueue	macQueue
	A queue to store packets from upper layer in case another packet is still waiting for transmission..
unsigned int	queueLength
	length of the queue

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Detailed Description

MAC module which provides pure Aloha.

This is an implementation of a pure Aloha (not slottes). The idea of Aloha is to send a packet whenever a packet is ready to be sent.

If a packet from the upper layer arrives although there is still another packet waiting for its transmission or being transmitted the new packet is stored in a queue. The length of this queue can be specified by the user in the omnetpp.ini file. By default the length is 10. The minimum queue length is 1. If the queue is full new packet(s) will be deleted.

Author:

Marc Löbbers, Yosia Hadisusanto, Andreas Koepke

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Member Enumeration Documentation

enum AlohaMacLayer::States [protected]

MAC states. The MAC states help to keep track what the MAC is actually trying to do -- this is esp. useful when radio switching takes some time. RX -- MAC accepts packets from PHY layer TX -- MAC transmits a packet

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Member Function Documentation

void AlohaMacLayer::handleSelfMsg (  cMessage *  msg  )  [virtual]

Handle self messages such as timers. After the timer expires try to retransmit the message by calling handleUpperMsg again. Implements BasicLayer.

void AlohaMacLayer::receiveBBItem (  int  category, const BBItem *  details, int  scopeModuleId )  [virtual]

Called by the Blackboard whenever a change occurs we're interested in. Update the internal copies of interesting BB variables Reimplemented from BasicModule.

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

• AlohaMacLayer.h
• AlohaMacLayer.cc

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