Modeling umts discontinuous reception mechanism,” Wireless Communications

Abstract—This paper investigates the discontinuous reception (DRX) mechanism of universal mobile telecommunications system (UMTS). DRX is exercised between the network and a mobile sta-tion (MS) to save the power of the MS. The DRX mechanism is con-trolled 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 expected packet waiting time, and the power saving factor. Our study quantitatively shows how to se-lect appropriate inactivity timer and DRX cycle values for various traffic patterns. Index Terms—Discontinuous reception (DRX), power saving, universal mobile telecommunications system (UMTS). I