Optimal Channel Assignment for QoS Provisioning in Multilayer Mobile Media Networks

Abstract

Today s and future mobile generation communication of networks support different requirements by different users. Although wireless mobile communication networks started to support ordinary phone calls, today, mobile phones offer many other services such as text messaging, multimedia messages, web browsing, and video transmission. Even for the same type of calls, different customers may have different quality of services requirements based on different cost per user. Call Admission Control (CAC) is the fundamental aspect in existing the service quality of the elements of wireless mobile network. CAC provides the solution of the issues that which new service call(s) can be admitted in the system from waiting users. This will in turn look for the power and data-rate requirements for that (those) particular user(s) for fixed time duration. It restricts the access to the network based on resource availability in order to prevent network congestion and service degradation for already supported users. CAC has critically defined role in performance of network. A quality CAC Scheme crucially defines the acceptance or rejection of new requests. In order to make that, the scheme must take into account many factors, and try to balance the network utilization, and the call rejection ratios, which are usually contradictory. In order to achieve maximum utilization, we must admit any call. Simultaneously, in order to decrease call rejection ratio for high priority calls, we must leave some extra bandwidth in the network for high priority calls. Wireless networks shared with wired networks required to limit the newly requested calls. However wireless mobile networks suffer from another added complication that is handoff, when a customer moves between various cells, we must request a call admission in the new cell the customer moved to, that should be dealt distinguishably than a new call request in the cell. As the demand for wireless services continues to increase, we must consider the fact that the cell sizes are getting small