Conventional and Unconventional Cellular Admission Control Mechanisms
Anna Izabel J. Tostes, Fátima Duarte-Figueiredo, Luis E. · InTech eBooks · 2011
Will-be-set-by-IN-TECHThis chapter is organized as it follows.Section 2 presents how services are admitted through 3G networks, describing the services classes, the network architecture and the basic CAC concepts.Section 3 introduces references of conventional CACs.Section 4 presents a case study of two conventional CACs.Section 5 explains unconventional CAC's concepts.Section 6 presents a case study of two unconventional CACs.Section 7 describes how a CAC evaluation can be made while section 8 demonstrate some of this evaluations in a case study.Section 9 concludes this chapter and section 10 presents references. How services are admitted through 3G networks3rd Generation Partnership Project (3GPP) group has conceived the 3G cellular networks to meet three requirements: (1) at least 2 Mbps peak throughput, (2) multimedia transmission with QoS and (3) international roaming.To make this guarantee, the services were divided into four classes.These classes are used to conduct services prioritization in CACs. Types of servicesApplications and voice have specific QoS requirements.For example, the requirements are different for web browsing, video streaming, image transmission and SMS.The 3G network services are classified in four QoS classes for each traffic type (3GPP, 2010):Conversational.This class of service represents real time (RT) applications, such as voice or telnet.The main QoS requirement is low delay.Low jitter and low packet loss are also important.Streaming.This class of service represents multimedia and data transfer with continuous and stable stream processing.It's main QoS requirement is low jitter.Low delay and low packet loss should also be considered.Interactive.This class of service is characterized by client/server requests with traffic bursts, such as web browsing, interactive games and email server access.Although this class is not sensible to jitter, the main QoS requirement is delay.Background.This class of service represents not real time (NRT) applications, such as email (server to server), fax and transactions services, as SMS.This class is the most tolerant to delay.The main QoS requirement is a high throughput.