An on-line hot-spot detection scheme in DS-CDMA networks - single traffic type

The intensive handoff calls from surrounding cells, triggered by non-uniform traffic distribution, cause more serious quality of service (QoS) deterioration problems than uniform traffic distribution because they usually cannot be regulated by admission control. This paper proposes an on-line hot-spot detection scheme, which predicts the presence of hot-spots and assists the admission control to reduce the handoff deterioration probability. Our proposed scheme consists of two procedures: 1) a utilization trend detection procedure, which predicts the traffic load of the desired sector from its past utilization information; and 2) an aggregated utilization procedure, which estimates how close is the desired sector to the hot-spot regime. Simulations show that under an acceptable new call blocking probability, the proposed scheme decreases the handoff deteriorating probability of the hot-spot cells and their surrounding cells.