Call Admission Control for QoS Provisioning in Multimedia Wireless ATM Networks

摘要

In this paper, we investigate a call admission control (CAC) problem in a multimedia wireless ATM network that supports various multimedia applications based on mi- cro/pico cellular architectures. Due to reduced wireless cell size (compared to conventional cellular networks), forced termination of calls in progress becomes a more serious problem in the wireless ATM network. Another problem specific to the multimedia wrire- less network is how to avoid an excessive delay of non-realtime applications under the presence of various realtime applications with priority over non-realtime applications. We consider two service classes; CBR for realtime applications and UBR for non- realtime applications, and then propose a new CAC scheme that addresses above two problems while minimizing a blocking prob- ability of newly arriving calls of CBR. Through the analytical methods, we derive the blocking probabilities and forced termi- nation probabilities of CBR calls and the average packet delay of UBR connections. We also present a method that decides the optimal CAC threshold values in our CAC scheme.