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A Decentralized Subchannel Allocation Scheme with Inter-Cell Interference Coordination (ICIC) for Multi-Cell OFDMA Systems

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3 Author(s)
Ioannis G. Fraimis ; Dept. of Electr. & Comput. Eng., Univ. of Patras, Rio, Greece ; Vasileios D. Papoutsis ; Stavros A. Kotsopoulos

Inter-cell interference (ICI) is responsible for user throughput degradation and especially for users found near cell border which additionally experience serious path-losses. Efficient methods for ICI mitigation are ICI coordination (ICIC) schemes which allocate certain resources among users in different cells. In this paper we propose a decentralized ICIC scheme in order to mitigate the ICI and enhance the capacity of the users found near the cell-edge area of a wireless multi-cell OFDMA system. Key features of the proposed scheme are the subchannel the allocation in a user selective manner considering instantaneous channel conditions and subchannel reuse minimization. The multi-cell subchannel allocation problem is decomposed into a distributed single-cell optimization problem with inter-cell coordination facilitaded by interfaces similar to X2 in 3GPP Long Term Evolution (LTE) networks. We prove through simulation that the proposed scheme yields better performance than existing conventional schemes.

Published in:

Global Telecommunications Conference (GLOBECOM 2010), 2010 IEEE

Date of Conference:

6-10 Dec. 2010