Date Added: Feb 2010
Call Admission Control (CAC) is an essential functionality for networks supporting Quality of Service (QoS). In this paper, the authors study distributed CAC schemes that serve to alleviate the scalability and responsiveness problems observed in their centralized counterpart. Actually, currently proposed Call Admission Control methods for most next generation networks are centralized, thus complicating matters for scalability and robustness. On the other hand, distributed CAC techniques show a better behaviour in terms of reliability. However, the CAC becomes more sophisticated and difficult to implement and manage, primarily because resource brokerage is now carried out on an individual basis on many different CAC units.