Modeling umts discontinuous reception mechanism,” Wireless Communications

This paper investigates the discontinuous reception (DRX) mechanism of UniversalMobile Telecom-munications System (UMTS). DRX is exercised between the network and a mobile station (MS) to save the power of the MS. The DRX mechanism is controlled by two parameters: the inactivity timer threshold and the DRX cycle. Analytic and simulation models are proposed to study the effects of these two parameters on output measures including the expected queue length, the ex-pected packet waiting time, and the power saving factor. Our study quantitatively shows how to select appropriate inactivity timer and DRX cycle values for various traffic patterns