Cross Layer Extended Parameter Call Admission Control for Future Networks

Abstract

The Next Generation Network (NGN) is to deliver anything, anytime anywhere with full quality of service (QoS) guarantees. The network designers need to overcome the NGN's challenges namely; heterogeneous wireless access environments, multiple traffic types, flexible bandwidth allocation and cross layer design issues among others. To guarantee quality of service for these NGN's, a call admission control scheme addressing the main challenges of NGN's is presented. This is a cross layer call admission control (CAC) scheme featuring multiple traffic types. The featured model effectively combines call level and packet level call admission control issues. It is based on Code Division Multiple Access (CDMA) air interface which together with Orthogonal Frequency Division Multiple (OFDM) access are the most popular air interface technologies. Traditionally, signal to interference ratio (SIR) has solely been used as the call admission control parameter for CDMA networks. However, the results indicate that due to the nature of the multimedia traffic more parameters need to be incorporated in the call admission control scheme. The presented CAC scheme uses extended user specified QoS parameters of signal to interference ratio (SIR) and delay to accept or reject a call and guarantee a certain call blocking probability QoS metric. The results from the developed model clearly indicate that a CAC algorithm incorporating more parameters outperforms one with less admission control parameters.