This paper presents the efficient mobility and the bandwidth reservation mechanism to guarantee the Quality of Service (QoS) on the General Packet Radio Service (GPRS) network. The proposed method takes advantage of the HLR (Home Location Register) for establishing the bi-directional Resource ReSerVation Protocol (RSVP) path and the GGSN (Gateway GPRS Support Node) for supporting RSVP set-up. Our proposal can reduce the RSVP reconfiguring time at handover time of a Mobile Host(MH), and shows the result of cost analysis.