Dynamic fair power sharing admission control for HAP-UMTS communication system

Cellular communications using High Altitude Platform (HAPs) are studied for next generation broadband wireless network providing also Third Generation (3G) mobile services. The Connection Admission Control (CAC) issue in a HAP-UMTS communication system represents a key problem in order to increase the capacity in terms of admitted users preserving the agreement quality of service. The main problem of a full centralized admission control approach consists in an excessive calls blocking for the traffic sources located in the middle of the aerial platform coverage area, due to the high additive interference level generated by all active users. With the aim of resolving this issue, we propose a novel strategy for the admission procedure, based on dynamic power sharing (DFPS), in order to guarantee a high fairness level to all users of the implemented cellular system, in term of calls blocked in each cell. Furthermore, we compare this approach with a previous one based on full centralized power sharing (FCPS). Simulation results show that the proposed CAC scheme can achieve better performances than the previous one, managing the active connections in a "fair" manner also under high load conditions.