Co-tier and Co-channel Interference Avoidance Algorithm for Femtocell Networks

Authors: S. Padmapriya, M. Tamilarasi

Abstract:

Femtocells are regarded as a milestone for next generation cellular networks. As femtocells are deployed in an unplanned manner, there is a chance of assigning same resource to neighboring femtocells. This scenario may induce co-channel interference and may seriously affect the service quality of neighboring femtocells. In addition, the dominant transmit power of a femtocell will induce co-tier interference to neighboring femtocells. Thus to jointly handle co-tier and co-channel interference, we propose an interference-free power and resource block allocation (IFPRBA) algorithm for closely located, closed access femtocells. Based on neighboring list, inter-femto-base station distance and uplink noise power, the IFPRBA algorithm assigns non-interfering power and resource to femtocells. The IFPRBA algorithm also guarantees the quality of service to femtouser based on the knowledge of resource requirement, connection type, and the tolerable delay budget. Simulation result shows that the interference power experienced in IFPRBA algorithm is below the tolerable interference power and hence the overall service success ratio, PRB efficiency and network throughput are maximum when compared to conventional resource allocation framework for femtocell (RAFF) algorithm.

Keywords: Co-channel interference, co-tier interference, femtocells, guaranteed QoS, power optimization, resource assignment.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1337963

References:

[1] M. Reardon, “Cisco predicts wireless data explosion,” Press release, 9th Feb 2010.
[2] Uk Jang, Keeseong Cho, Won Ryu and Ho-Jin Lee, "Interference Management with Block Diagonalization for Macro/Femto Coexisting Networks," ETRI Journal, vol. 34, no. 3, June. 2012, pp. 297-307.
[3] V. Chandrasekhar, J.G. Andrews, "Uplink capacity and interference avoidance for two-tier femtocell networks," IEEE Transactions on Wireless Communications, vol.8, no.7, pp.3498,3509, July 2009.
[4] Z. Jun and J. G. Andrews, “Adaptive spatial intercell interference cancellation in multicell wireless networks,” IEEE J. Sel. Areas Commun., vol. 28, no. 9, pp. 1455–1468, Dec. 2010.
[5] J.-H. Yun and K. G. Shin, “CTRL: A self-organizing femtocell management architecture for co-channel deployment,” in Proc. ACM Int. Conf. Mobile Comput. Netw., pp. 61–72, 2010.
[6] D. López-Pérez, A. Valcarce, G. de la Roche, and J. Zhang, “OFDMA femtocells: A roadmap on interference avoidance,” IEEE Commun. Mag.,vol. 47, no. 9, pp. 41–48, Sep. 2009.
[7] Wei Wang, Guanding Yu and Aiping Huang, “Cognitive Radio Enhanced Interference Coordination for Femtocell Network,” IEEE Communication Magazine, June 2013, pp. 37-43.
[8] L. Tan, Z. Feng, W. Li, Z. Jing, and T. A. Gulliver, “Graph coloring based spectrum allocation for femtocell downlink interference mitigation,” in Proc. IEEE Wireless Commun. Netw. Conf., Mar. 2011, pp. 1248–1252.
[9] Yu-Shan Liang, Wei-Ho Chung, Guo-Kai Ni, Ing-Yi Chen, Hongke Zhang and Sy-Yen Kuo, "Resource Allocation with Interference Avoidance in OFDMA Femtocell Networks," Vehicular Technology, IEEE Transactions on , vol.61, no.5, pp.2243,2255, Jun 2012.
[10] S.Boyd and L. Vandenberghe, Convex Optimization. Cambridge, U. K.: Cambridge Univ. Press, Mar. 2014.
[11] 3GPP Technical Specification TS 36.213 V10.3.0, Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Layer Procedures, Sep. 2011. Available Online: http://www.3gpp.org/ftp/Specs/htmlinfo/ 36213.htm