(An) effective hotspot cell management scheme using adaptive handover time

Abstract

In the cellular system, hotspot cells are caused when the wireless resources available at some location are not enough to sustain the needs of the users. This could potentially lead to blocked and dropped calls and make users who exist within or enter into the hotspot cell feel very uncomfortable services. Therefore, the hotspot cell being made is one of the problems awaiting solution as long as the cellular system exists. Recently, as various multimedia services are supported in the system, a band of people within the bus or car can move with keeping wireless connections. This can make the hotspot cell which has a short length of life be frequently generated in the network. Existing algorithms proposed until now only consider traffic loads of the hotspot cell. Thus, it may cause more hotspot cells in the all service area. We propose an algorithm that adaptively changes the time to handover according to loads of the current and target cell in order to effectively manage the hotspot cell in the overall network. If the current cell receives hotspot warnings from neighboring cells, handovers to adjacent cells are executed as fast as possible in order to accommodate loads it can adequately handle. Neighboring cells less heavily loaded delay handovers to the hotspot cell. It means the time that connection with the network is maintained becomes to be prolonged. And it can also make a cell rapidly get out of from the status of hotspot. If both the current and target cell are the hotspot status, conventional handovers are executed to achieve the equality of load distribution. In other words, the proposed scheme can give a time to obtain wireless resources to the cells which receive hotspot warnings. It aggravates loads to these cells as slowly as possible. The proposed scheme can also let cells expected to the hotspot prepare to entering traffic by distributing their loads to adjacent cells which are less heavily loaded. Finally, it can reduce the number of hotspot ...