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A Resource Allocation Scheme with Fractional Frequency Reuse in Multi-cell OFDMA Systems

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Abstract

In this paper, a resource allocation scheme is proposed for multi-cell OFDMA systems in downlink under the fractional frequency reuse environments. The objective considers balancing between the maximization of the system throughput and the satisfaction of the user’s data rate requirement. Due to the severe co-channel interference for cellular networks with full frequency reuse, a dynamic fractional frequency reuse scheme is adopted in the cellular network which divides all subcarriers in each cell into two groups: a super group and a regular group. The dynamic fractional frequency reuse scheme can guarantee the intra-cell orthogonality and reduce the inter-cell interference. Therefore, the procedure of the proposed resource allocation scheme includes two main parts: frequency partition and subcarrier allocation. First, each subcarrier is assigned to either the super group or the regular group based on designed functions in all cells. Second, we allocate subcarriers to users by utilizing the designed functions. The designed functions are developed based on the proportional fairness scheduling, the logarithm transformation, and the Lagrangian technique. The designed function is coupled with the instantaneous data rate, the average data rate, and the data rate requirement. Simulation results show that the proposed scheme provides a higher system throughput and improves the outage probability compared with existing schemes.

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Acknowledgements

Funding was provided by Ministry of Science and Technology of the Republic of China, Taiwan (Grant No. MOST 106-2221-E-008-016).

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Authors and Affiliations

  1. Industrial Technology Research Institute, Zhudong, Taiwan, ROC

    Wei-Chen Pao

  2. Department of Communication Engineering, National Central University, 300 Jhongda Rd., Jhongli City, 320, Taoyuan, Taiwan, ROC

    Wen-Bin Wang & Yung-Fang Chen

  3. Department of Electronic Engineering, National Taipei University of Technology, Taipei, Taiwan, ROC

    Shu-Ming Tseng

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  1. Wei-Chen Pao
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  2. Wen-Bin Wang
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  4. Yung-Fang Chen
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Correspondence to Yung-Fang Chen.

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Pao, WC., Wang, WB., Tseng, SM. et al. A Resource Allocation Scheme with Fractional Frequency Reuse in Multi-cell OFDMA Systems. Wireless Pers Commun 101, 2009–2027 (2018). https://doi.org/10.1007/s11277-018-5803-5

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  • DOI: https://doi.org/10.1007/s11277-018-5803-5

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