Negotiation of QoS through Service differentiation by CAC for 3G Cellular Network
Keywords:
Call Admission Control (CAC), Quality-of-Service(QoS), Universal Mobile Telecommunication System (UMTS), Grade-of-Service (GoS), Successful Call Completion Rates (SCCR), Wide Band Code Division Multiple Access (WCDMA)Abstract
In the 1G and 2G wireless cellular systems, Call Admission Control (CAC) was designed for a single service scenario. However, in 3G and beyond wireless cellular systems, multimedia services such as video, data, and audio are provided with various Quality of Service (QoS) profiles. Therefore, more sophisticated CAC schemes are required to handle these challenges. With the support of higher data transmission rates for mobile users, 3G networks are expected to accommodate different broadband multimedia services. CAC is essential for admitting a reasonable number of users in a way that meets various QoS requirements while improving spectrum efficiency. Voice and data are the basic requirements of every user, and these services are also demanded with good quality. Multimedia traffic is managed by a queuing system, which helps reduce congestion in the cellular network caused by newly originated and existing calls. In this paper, we consider two types of services: voice and data. We demonstrate that our scheme reduces the probability of dropped calls and enhances overall system performance.
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