In this paper, we propose a new mechanism for supporting seamless QoS guarantees in mobile Internet, called Selective Establishment of Pseudo Reservations (SEP). SEP addresses the issues of the conventional approaches such as excessive reservation requirements due to establishment of multiple advance reservations. It significantly reduces the number of required advance reservations by employing a movement detection scheme using link-layer functionalities. SEP requires fewer functional and structural changes in the current Internet components and protocols since all enhanced features are integrated into leaf base stations (BSs). Experimental results show that SEP outperforms the conventional approaches such as HMRSVP in reservation session loss and completion rates as the offered load in the network becomes high and the average number of handoffs increases during a reservation session.