Call Admission Control for Preemptive and Partially Blocking Service Intergration Schemes in ATM Networks

This paper evaluates a Markov decision approach to single–link Call Admission Control for CBR/VBR and ABR/UBR services. Two different schemes that support integration of narrowband ABR/UBR and wide-band CBR/VBR services are evaluated: the standard preemptive scheme and the modified partial blocking scheme. The structure of the Markov decision policy shows an ”intelligent blocking” feature, which implements bandwidth reservation for wide-band calls. The numerical results show that the Markov decision method yields higher long-term reward than the complete sharing method when the ability to create sufficient capacity for wideband calls through partial blocking/preemption is limited. The results also show that the modified partial blocking scheme, which allows total preemption, gives the highest average reward rate.