Traffic generation

Traffic generation

Traffic is a flow of data in a communication channel. For example, web traffic is the data that is sent or received by a user's web-browser. During the development of telecommunication systems it is very important to precisely simulate various kinds of traffic generated, for example, by a wireless device.There are two kinds of data networks: circuit-switched and packet-switched. The traffic in the former model is generated constantly (for example, in IS-95 networks a data packet is sent every 20 ms, not depending on whether there is any data to send or not). In the packet-switched networks the traffic has bursty nature, i.e. sometimes there the data is transmitted only if there is something to transmit.

There are at least two approaches for traffic generation in packet-switched networks: the 3GPP2 model and the 802.16 model. The 3GPP2 model is much more complex to implement but it is supposed to give more precise results. The 802.16 model is much simpler in realization.

3GPP2 model

The 3GPP2 model is described in [http://www.3gpp2.org/Public_html/specs/C.R1002-0_v1.0_041221.pdf CDMA2000 Evaluation Methodology Version 1.0 (Revision 0)] . This document describes the following types of traffic generators:
* Downlink:
** HTTP/TCP
** FTP/TCP
** WAP
** near real-time Video
** Voice
* Uplink:
** HTTP/TCP
** FTP/TCP
** WAP
** Voice
** Mobile Network Gaming

The main idea is to partly implement HTTP, FTP and TCP protocols. For example, an HTTP traffic generator simulates the download of a web-page, consisting of a number of small objects (like images). A TCP stream (that's why TCP generator is a must in this model) is used to download these objects according to HTTP1.0 or HTTP1.1 specifications. These models take into account the details of these protocols' work. The Voice, WAP and Mobile Network Gaming are modelled in a less complicated way.

802.16 model

The 802.16 model is much simpler. It was proposed in several [http://www.wirelessman.org/tg3/contrib/ 802.16 TG3 contributions] . The idea is to define three basic models:
* Interrupted Poisson Process (IPP)
* Interrupted Discreet Process (IDP)
* Interrupted Renewal Process (IRP)and mix them together in order to simulate different kinds of web-traffic. Every interrupted process may be either in ON or OFF state. The packets are generated only in ON state. The lengths of ON and OFF periods, sizes of the packets and intervals between them are defined separately in each model, so these models differ in the way their parameters are defined. These models may be mixed together, for example: 4IPP means a mix of four IPP flows with different parameters.HTTP and FTP is simulated as 4IPP; VoIP is simulated as IDP, 2IDP, 4IDP; Video is simulated as 2IRP.


Wikimedia Foundation. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • Traffic generation model — A traffic generation model is a stochastic model of the traffic flows or data sources in a communication network, for example a cellular network or a computer network. A packet generation model is a traffic generation model of the packet flows or …   Wikipedia

  • Traffic in Towns — was an influential report and popular book on urban and transport planning policy produced in 1963 for the UK Department of Transport by a team headed by the architect, civil engineer and planner Professor Sir Colin Buchanan.cite… …   Wikipedia

  • Traffic flow (computer networking) — For other uses, see Flow (disambiguation). In packet switching networks, traffic flow, packet flow or network flow is a sequence of packets from a source computer to a destination, which may be another host, a multicast group, or a broadcast… …   Wikipedia

  • Traffic Giant — Éditeur JoWood Développeur JoWood Date de sortie 2000 Genre Gestion Mode de jeu Un joueur Plate forme …   Wikipédia en Français

  • Traffic giant — Éditeur JoWood Développeur JoWood Date de sortie 2000 Genre Gestion Mode de jeu Un joueur Plate for …   Wikipédia en Français

  • Traffic Violation Records — was a punk record label based on Long Island, New York. While an underground hardcore scene was already established on Long Island at its inception in 1995, Traffic Violation was ambitious about networking with an international DIY community a… …   Wikipedia

  • Traffic Collision Avoidance System — The Traffic alert and Collision Avoidance System (or TCAS) is an aircraft collision avoidance system designed to reduce the incidence of mid air collisions between aircraft. It monitors the airspace around an aircraft for other aircraft equipped… …   Wikipedia

  • Traffic light — The traffic light, also known as traffic signal, stop light, traffic lamp, stop and go lights, robot or semaphore, is a signaling device positioned at a road intersection, pedestrian crossing, or other location. Its purpose is to indicate, using… …   Wikipedia

  • Traffic Control — ➡ law enforcement * * * Introduction       supervision of the movement of people, goods, or vehicles to ensure efficiency and safety.       Traffic is the movement of people and goods from one location to another. The movement typically occurs… …   Universalium

  • Traffic flow — The mathematical or engineering study of traffic flow, and in particular vehicular traffic flow, is done with the aim of achieving a better understanding of these phenomena and to assist in the reduction of traffic congestion problems.The first… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”