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Interference Coordination Oriented User Association Scheme in Cellular Relay Networks

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Abstract

Heterogeneous cellular networks (HCNs) will be the typical network structure for future mobile networks. Relay nodes (RNs), as one type of low power nodes in the HCNs, can be deployed to increase cell coverage and improve cell-edge user throughput. Since RNs may be densely deployed in hot traffic zones, the co-channel interference (CCI) is more serious and complex than that in the conventional homogeneous networks. In this paper, we propose an interference coordination oriented user association scheme in cellular relay networks for CCI coordination. Firstly, we define a relay interference matrix (RIM), which is used to decrease the interference-related information feedback overhead. Then we define a function named as interference duration density (IDD), which indicates the interference probability from a RN to a user equipment in both the time and frequency domains. Specifically, based on RIM and IDD, the proposed user association scheme can reduce the probability of the CCI from interfering RNs by adjusting the number of users associated with such interfering RNs. By doing so, the CCI among RNs can be mitigated and the system performance is improved. The proposed scheme can be applied to both the frequency reuse of RNs and the frequency sharing of RNs in one cell. In the simulation, we verify the effectiveness of the defined RIM. Then we evaluate the performance of the proposed scheme in terms of relay link user throughput, spectrum efficiency and user fairness.

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Acknowledgments

This work is supported by the National Key Technology R&D Program of China (2012ZX03001031-004) and Beijing Natural Science Foundation (4144079).

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Authors and Affiliations

  1. Beijing Key Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecom, Beijing, China

    Tiankui Zhang

  2. School of Electronic Engineering and Computer Science, Queen Mary University of London, London, UK

    Yue Chen & Dantong Liu

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  1. Tiankui Zhang
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  2. Yue Chen
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  3. Dantong Liu
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Correspondence to Tiankui Zhang.

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Zhang, T., Chen, Y. & Liu, D. Interference Coordination Oriented User Association Scheme in Cellular Relay Networks. Wireless Pers Commun 80, 451–469 (2015). https://doi.org/10.1007/s11277-014-2020-8

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  • DOI: https://doi.org/10.1007/s11277-014-2020-8

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