Editing Traffic generation model (section)

==Payload data model==
The actual content of the payload data is typically not modeled, but replaced by dummy packets. However, if the payload data is to be analyzed on the receiver side, for example regarding [[bit-error rate]], a [[Bernoulli process]] is often assumed, i.e. a random sequence of independent binary numbers. In this case, a [[channel model]] reflects channel impairments such as noise, interference and distortion.

=== 3GPP2 model ===
One of the [[3rd Generation Partnership Project 2|3GPP2]] models is described in.<ref>[http://www.3gpp2.org/Public_html/specs/C.R1002-0_v1.0_041221.pdf CDMA2000 Evaluation Methodology Version 1.0 (Revision 0)] {{Webarchive|url=https://web.archive.org/web/20061014014956/http://www.3gpp2.org/Public_html/specs/C.R1002-0_v1.0_041221.pdf |date=2006-10-14 }}</ref> This document describes the following types of traffic flows:
* [[Downlink]]:
** [[HTTP]]/[[Transmission Control Protocol|TCP]]
** [[File Transfer Protocol|FTP]]/[[Transmission Control Protocol|TCP]]
** [[Wireless Application Protocol]]
** near real-time [[Video]]
** [[voice message|Voice]]
* [[Uplink]]:
** [[HTTP]]/[[Transmission Control Protocol|TCP]]
** [[File Transfer Protocol|FTP]]/[[Transmission Control Protocol|TCP]]
** [[Wireless Application Protocol]]
** [[voice message|Voice]]
** Mobile Network Gaming

The main idea is to partly implement HTTP, FTP and TCP [[Communications protocol|protocol]]s. 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.