الفهرس 
Femtocell TechnologyOnly 14 pages are availabe for public view
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Abstract
Heterogeneous Network (HetNet) often indicates the use of multiple types of access nodes in a wireless network. It is a wide area network that can use macrocells, picocells, and/or femtocells in order to offer wireless coverage in an environment with a wide variety of wireless coverage zones, ranging from an open outdoor environment to office buildings, homes, and underground areas. The co-existence of multiple types of nodes in the same area offers a considerable increase in the bandwidth efficiency, namely the area spectral efficiency, as all the nodes are reusing the same bandwidth available for the macro-cell in the shared coverage area. However, this increase in the bandwidth efficiency is very promising, but this with the cost of high interference between the different HetNet nodes. In the proposed model, we address the interference problem in a HetNet environment composed of macrocells and femtocells.
Femtocells, also called Home Base Stations, are small cellular access points installed by home users to get a better indoor voice and data coverage with lower network operation cost. The deployment of femtocells in LTE cellular networks is currently being studied to enable more efficient utilization of the available spectrum.
Furthermore, Cooperation among the femtocells becomes an optimization technique to induce a fair resource allocation to the serving users. However, cooperation performance is restricted by backhaul limitations. Hence, in the proposed model, an energy efficient system design for cooperative self-organizing femtocells (SOFs) is proposed. A new spectral resource management is used to avoid the uplink co-tier interference depending on less signaling overhead resulting from cooperation organization among SOFs. A model is built for the cooperation among the SOFs for resource allocation with minimum backhaul signaling traffic. The simulation results show that the proposed model guarantees different radio blocks allocation for femto-users affected by the co-tier interference. In addition, the proposed model will reduce the traffic of the cooperation by 45% of that of the conventional model. Finally, the proposed model performance in terms of latency and power consumption for different backhaul technologies is simulated. It is found that the signaling power consumption can be reduced from 814w to 159w. Therefore, our proposed cooperation model can be considered energy efficient.