Teletraffic Analysis of a Call Admission Control Scheme with TCP Protocol Induced Factors

Future networks face tremendous challenges towards providing guaranteed Quality of Service (QoS) for the multiple traffic types employing numerous protocols. This work presents an expanded parameter Call Admission Control (CAC) scheme and intelligent scheduling to provide QoS on modern networks. The expanded parameter CAC scheme features the lower layers Signal to Interference Ratio (SIR) and network delay as admission parameters. The SIR is due to the transmission on the code division multiple access network and delay is due to the operation of the Transmission Control Protocol (TCP). TCP delay is a good representative of the aggregated delays of the entire network; both access and core network as it is at a higher layer. TCP was ideally designed for wired networks. TCP performance is degraded and leads to substantial delay while operating on wireless lossy links as it reduces the sending rate and resends lost packets. This work presents an analytical framework for evaluating the performance of a wireless TCP based CAC model which features Batch Markovian Arrival Process (BMAP) traffic, a better representative of the future traffic characteristics than the traditional Poisson traffic. A teletraffic analysis of a network with TCP is done and the impact of TCP induced delays on the network is investigated for a future generation CAC scheme.