关键词: 立即保留, 预先保留, 接纳控制, 带宽代理

Abstract: The Quality of Service (QoS) reservation in Differentiated Service (DiffServ) networks can be classified into two sets: Immediate Reservation calls (IR calls) and Advance Reservation calls (AR calls). When an admitted AR call became active, some ongoing IR calls were interrupted when the bandwidth was insufficient to support both IR and AR calls. Thus an IR call would be admitted by admission control scheme only if its approximate interrupt probability (computed in real time) was below a threshold. In many previous studies, the interrupt probability of IR calls was under the assumption that AR calls started their connections at the time they reserved. However, users may establish advance or postponed their connections. Thus, a more accurate Approximation under Inexact Connection Arriving Times (AICA) way was proposed to estimate the interrupt probability of IR calls in the environment where AR calls were admitted with inexact connection arriving times. The results showed that our calculation could get a higher and more correct interrupt probability of an IR call so that its actual interrupt probability was lower and its QoS was guaranteed.

Key words: immediate reservation, advance reservation, admission control