Performance and analysis of propagation models for efficient handoff in high altitude platform system to sustain QoS

In wireless environment, one of the key ingredients to provide efficient ubiquitous computing with guaranteed quality and continuity of service is the design of intelligent handoff algorithms. A handoff process can be the handoff used in order that the service can be continued uninterrupted. Efficient hand off algorithms enhance the capacity and Quality of Service (QoS) of cellular systems. QoS is the measure which defines the performance in any system. In this paper, the different path loss models have been used and then the received signal strength is calculated to determine the model that can be adopted to minimize the number of handoff. Estimation of path loss is very important in initial deployment of wireless network and cell planning. Handoff process enables a cellular system to provide such a facility by transferring an active call from one cell to another. Different approaches are proposed and applied in order to achieve better handoff service. HAP system can be considered as complementary to terrestrial cellular system being in an obstacle position. The key parameters and mathematical model is important for predicting signal coverage. Path loss models for macro cells such as Hata, Walfish-Ikegami and lee models are analysed.