Indexed on: 01 Jul '99Published on: 01 Jul '99Published in: Multimedia Tools and Applications
With the advent of different types of applications in bandwidth scarce cellular environment, efficient usage of bandwidth while providing the required Quality of Service (QoS) for these applications becomes a challenging issue. In a cellular environment, there is always a tradeoff between the efficient usage of network bandwidth and uninterrupted (seamless) communication to each user. The paramount importance is always given to the seamlessness, which could be achieved by the reservation based call admission policies. The degree of seamlessness is proportional to the amount of reservation. The objective of any call admission policy is to provide seamless communication with better bandwidth usage. This paper aims at achieving this objective by improving the Shadow Cluster call admission algorithm proposed recently in  for providing a high degree of seamlessness. Our proposed scheme exploits application semantics (loss profile) and delay properties of the application during call admission for better bandwidth utilisation and call acceptance. Moreover, efficient usage of bandwidth is highly desired under peak load conditions and the same is achieved by our scheme. We have conducted extensive simulation studies to evaluate the effectiveness of the proposed scheme under diverse traffic conditions by comparing it with the shadow cluster algorithm. The results clearly indicate that our scheme offers better bandwidth utilization and call acceptance rate than the shadow cluster algorithm for the same call drop percentage.