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Design of optimal relay location in two-hop cellular systems

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Abstract

Relay stations are usually used to enhance the signal strength for the users near cell boundary, thereby extending the cell coverage. However, transmission through a relay station needs two transmission phases. The first phase is from base station to relay station, and the second one is from relay station to mobile station. Thus, using relay station may decrease system capacity due to two-phase transmission time. As a result, whether or not data are transmitted by one-hop or two-hop phases should be determined according to both signal strength and throughput. In this paper, we investigate the optimal relay location aiming to maximize system capacity. We consider two relay selection rules for determining whether two-hop transmission will be used: signal strength-oriented and throughput-oriented selection rules. We find that the signal strength-oriented two-hop transmission may yield even lower system capacity than the one-hop transmission. In the throughput-oriented scheme, the two-hop transmission can achieve higher system capacity than the one-hop transmission. By simulations, we determine the optimal relay location and show the coverage enhancement by the relaying network. Extensive simulations are performed to investigate the impacts of relay transmission power and the number of relay stations on system capacity and optimal relay location. The simulation results reveal important insights into designing a relaying network with high system capacity.

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Acknowledgements

This work was supported in part by the MoE ATU Plan, the Program for Promoting Academic Excellence of Universities (Phase II), and the National Science Council under Grant 98W803C, Grant NSC 97-2752-E-009-003-PAE, Grant 97-2221-E-009-097-MY3, Grant 97-2221-E-009-099-MY3, and Grant 96-2628-E-009-004-MY3.

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Authors and Affiliations

  1. Graduate Institute of Communication Engineering, National Chi Nan University, Nantou County 545, Taiwan, ROC

    Jane-Hwa Huang

  2. Department of Communication Engineering, National Chiao Tung University, Hsinchu, 300, Taiwan, ROC

    Li-Chun Wang & Chung-Ju Chang

  3. Accton Technology Co., Ltd., Hsinchu, 300, Taiwan, ROC

    Wen-Shan Su

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  1. Jane-Hwa Huang
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  2. Li-Chun Wang
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Correspondence to Jane-Hwa Huang.

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Huang, JH., Wang, LC., Chang, CJ. et al. Design of optimal relay location in two-hop cellular systems. Wireless Netw 16, 2179–2189 (2010). https://doi.org/10.1007/s11276-010-0251-5

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