Hierarchical Cell Structure is a term normally utilized in GSM to depict the need of cells inside a mixed climate. Hierarchical cell structure utilized in versatile telecommunication. It permits the network to adequately utilize the geological region and serve an expanding population. In Hierarchical cellular structure (HCS), cells of various sizes are coordinated into various layers to give high coverage and capacity. At the point when Macro, Micro, and Pico cells may be seen as possibilities for cell reselection the priority depicted by the HCS will be utilized in the related computations.