earticle

영어

UMTS (Universal Mobile Telecommunications System) can be connected to the data networks. So Internet traffic services such as WWW browsing, email, ftp, SMTP (Simple Mail Transfer Protocol) should be handled by UMTS. Each of the traffic services has some specific properties but all of them obey a basic ON/OFF model. For a specific traffic user there is some unused (OFF) times between transmitted packets which we may use them for other services. In this paper based on the offered traffic services, models and parameters presented in 3GPP (3th Generation Partnership Project) we calculate ON and OFF time durations of the above traffic services in some different data rates, then calculate their corresponding activity factors. Finally we survey their impacts on the UMTS capacity and users. Simulation showed that the number of packet traffic users could be increased in comparison with circuit switch voice traffic users because they have lower Erlang traffic figures.