Application semantics and seamlessness based admission control policy for multimedia mobile networks

With the advent of different types of applications in bandwidth scarce cell ular environment, efficient usage of bandwidth while providing the required Quality of Service (QoS) for these applications becomes a challenging issu e. In a cellular environment, there is always a tradeoff between the effici ent usage of network bandwidth and uninterrupted (seamless) communication t o each user. The paramount importance is always given to the seamlessness, which could be achieved by the reservation based call admission policies. T he degree of seamlessness is proportional to the amount of reservation. The objective of any call admission policy is to provide seamless communicatio n with better bandwidth usage. This paper aims at achieving this objective by improving the Shadow Cluster call admission algorithm proposed recently in [8] for providing a high degree of seamlessness. Our proposed scheme exp loits application semantics (loss profile) and delay properties of the appl ication during call admission for better bandwidth utilisation and call acc eptance. Moreover, efficient usage of bandwidth is highly desired under pea k 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 cl uster algorithm. The results clearly indicate that our scheme offers better bandwidth utilization and call acceptance rate than the shadow cluster alg orithm for the same call drop percentage.