Reducing call routing cost for femtocells

Authors:
Yi-Bing Lin;Chai-Hien Gan;Ching-Feng Liang
Affiliations:
Department of Computer Science and Information Engineering, National Chiao Tung University, Taiwan and Institute of Information Science, Academia Sinica, Nankang, Taipei, Taiwan and Beijing Jiaoto ...;Information and Communications Research Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan, ROC;Department of Computer Science, National Chiao Tung University, Hsinchu, Taiwan and Information and Communications Research Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan, ...
Venue:
IEEE Transactions on Wireless Communications
Year:
2010

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Abstract

Femtocell is an effective solution to improve indoor coverage for cellular networks, where short-range and low-power Base Stations (BSs) called Femto BSs are deployed in small areas (e.g., buildings). We propose the Femto Private Branch Exchange (FPBX) to concentrate the traffic of the Femto BSs in a specific area, such as a campus or an enterprise with central or distributed locations. Through the FPBX, a normal cellular call between two Femto users can be replaced by a low-cost extension call. Therefore, the call routing cost can be significantly reduced. In this approach, the existing mobile network nodes are not modified. We analytically analyze the call routing performance for the FPBX approach, and develop simulation experiments to validate against the analytic model. Our study indicates that the FPBX approach can effectively reduces the call setup costs and the voice trunk costs among Femto users by slightly increasing the normal cellular call setup costs.