The heterogeneous network is a network associating computers where the operating frameworks and conventions have huge contrasts. Heterogeneous network likewise depicts wireless networks utilizing diverse access technologies. The concurrent activity of Macro-, micro-, pico- and femto-cells is named as heterogeneous networks. In heterogeneous networks the cells of various sizes are alluded to as macro-, micro-, pico- and femto-cells; listed in order of diminishing base station power.