Satellite based communications network has become an alternative means for providing communication services to less developed and rural areas. Although satellites are becoming increasingly sophisticated capable of providing spot beams for cellular coverage, their high development cost make them a less attractive solution for the less populated areas as the user density for recovering the capital cost may not be enough. Moreover, they are incapable of matching the user capacities offered by traditional terrestrial networks. Another possible option for delivering communication and other services is to use high altitude platforms (HAPs) [1]. High Altitude Platforms (HAPs) is a term that is used for qausi-stationary platforms (airships or planes) stationed at the stratosphere. Traditionally they are manned or unmanned aerial vehicles flying at the altitude of 17 to 22 km above the ground. Large airships such as Zeplin had been used in 1920s for carrying passengers been traditionally proposed for the surveillance purposes but relatively smaller size HAPs have now been proposed for providing communication services. The potential of rapid roll-out capability and the ability to serve a large number of users, using considerably less communications infrastructure is one of the key advantages for using HAPs as communication platforms. Moreover, the nearness of HAPs to the ground, while still maintaining wide area coverage, means that they exhibit the best features of terrestrial and satellite communications.

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