5G-LENA: ns3::TrafficGeneratorNgmnVoip Class Reference

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#include "traffic-generator-ngmn-voip.h"

Inheritance diagram for ns3::TrafficGeneratorNgmnVoip:

Collaboration diagram for ns3::TrafficGeneratorNgmnVoip:

Public Types
enum	VoipState { INACTIVE_STATE , ACTIVE_STATE }

Public Types inherited from ns3::TrafficGenerator
typedef TracedCallback< Ptr< const Packet > >	TxTracedCallback
	Traced Callback: sent packets.

Public Member Functions
int64_t	AssignStreams (int64_t stream) override

Public Member Functions inherited from ns3::TrafficGenerator
int64_t	AssignStreams (int64_t stream) override

Ptr< Socket >	GetSocket () const
	Get the socket this application is attached to.

uint64_t	GetTotalBytes () const
	Get the total number of bytes that have been sent during this object's lifetime.

uint64_t	GetTotalPackets () const
	Get the total number of packets that have been sent during this object's lifetime.

bool	SendPacketBurst ()
	Send another packet burst, which can be e.g., a file, or a video frame.

void	SetPacketSize (uint32_t packetSize)
	Sets the packet size.

void	SetProtocol (TypeId protocol)
	Sets the protocol.

void	SetRemote (Address remote)
	Sets the remote address.

Static Public Member Functions
static TypeId	GetTypeId ()
	Get the type ID.

Static Public Member Functions inherited from ns3::TrafficGenerator
static TypeId	GetTypeId ()
	Get the type ID.

Protected Member Functions
void	DoDispose () override

void	DoInitialize () override

Protected Member Functions inherited from ns3::TrafficGenerator
void	DoDispose () override

void	DoInitialize () override

uint32_t	GetPacketBurstSizeInBytes () const

uint32_t	GetPacketBurstSizeInPackets () const

Address	GetPeer () const

uint16_t	GetTgId () const

void	SetPacketBurstSizeInBytes (uint32_t burstSize)

void	SetPacketBurstSizeInPackets (uint32_t burstSize)

void	StopApplication () override

Additional Inherited Members
Public Attributes inherited from ns3::TrafficGenerator
TxTracedCallback	m_txTrace

Detailed Description

This class implements a traffic generator for the VoIP traffic. Follows the traffic gaming model for VOIP described in the Annex B of White Paper by the NGMN Alliance.

Basically, according to the NGMN document, the VOIP traffic can be modeled as a simple 2-state voice activity model. The states are:

Inactive State
Active State

In the model, the probability of transitioning from state 1 (the active speech state) to state 0 (the inactive or silent state) while in state 1 is equal to "a", while the probability of transitioning from state 0 to state 1 while in state 0 is "c". The model is assumed updated at the speech encoder frame rate R=1/T, where T is the encoder frame duration (typically, 20ms).

Clearly, a 2-state model is extremely simplistic, and many more complex models are available. However, it is amenable to rapid analysis and initial estimation of talk spurt arrival statistics and hence reservation activity/ The main purpose of this traffic model is not to favour any codec but to specify a model to obtain results which are comparable.

Definition at line 43 of file traffic-generator-ngmn-voip.h.

Member Enumeration Documentation

◆ VoipState

enum ns3::TrafficGeneratorNgmnVoip::VoipState

Definition at line 56 of file traffic-generator-ngmn-voip.h.

Constructor & Destructor Documentation

◆ TrafficGeneratorNgmnVoip()

ns3::TrafficGeneratorNgmnVoip::TrafficGeneratorNgmnVoip ( )

Definition at line 88 of file traffic-generator-ngmn-voip.cc.

◆ ~TrafficGeneratorNgmnVoip()

ns3::TrafficGeneratorNgmnVoip::~TrafficGeneratorNgmnVoip ( )

override

Definition at line 94 of file traffic-generator-ngmn-voip.cc.

Member Function Documentation

◆ AssignStreams()

int64_t ns3::TrafficGeneratorNgmnVoip::AssignStreams ( int64_t stream )

override

Assign a fixed random variable stream number to the random variables used by this model. Return the number of streams (possibly zero) that have been assigned.

Parameters

stream first stream index to use