Before revision:  With this service framework , we develop a guaranteed QoS model, such as the upper bounds on buffer queue length , buffer queue delay, end-to-end delay/jitter and end-to-end effective bandwidth.
After revision:  With the system skeleton , we develop a guaranteed QoS model, such as the upper bounds on buffer queue length , buffer queue delay, end-to-end delay/jitter and end-to-end effective bandwidth.