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Dynamic Configuration and Optimization of WiMAX Networks with Relay Power Saving Modes: Measurement-Based Scenario in a Hilly Region

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Abstract

This paper investigates the performances achievable by WiMAX networks deployed in various sectorization configurations, with and without relay stations (RSs). Further, it studies the dynamic adjustment of the configuration to serve traffic loads at different times of the day while maximising the use of opportunistic sleep modes by relays in conjunction with cell zooming, thereby saving energy. The configuration changes and invocation of opportunistic sleep modes also take into account coverage constraints. This paper first reports extensive propagation measurements that have been undertaken in Covilhã, a hilly area of Portugal which presents a realistic and challenging propagation scenario. Using this scenario as the topographical basis, practical cellular planning results are then obtained and compared, using the dominant path and ray tracing (RT) functionalities of Winprop™. It is shown that without RSs present, the supported throughput is lower in practice because coverage is not 100 %. Further, for the case with omnidirectional cells, coverage reduces to only approximately 60 % if RSs go into sleep mode, and for the tri-sectored cells case coverage drops from 95.75 to 81.90 % (based on RT calculations) if RSs go into sleep mode. There is, however, still a reasonable economic performance in all cases. Additional results demonstrate that savings typically of 47.6 % in RSs’ average power consumption can be achieved. These savings are shown to result in a financial saving for the operator of 10 % of the combined operational and maintenance cost. However, it is observed that such solutions have to be used cautiously in hilly regions due to challenges in maintaining coverage.

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References

  1. Velez, F. J., del Camino Noguera, M., Holland, O., & Aghvami, A. H. (2011). Fixed WiMAX profit maximisation with energy saving through relay sleep modes and cell zooming. Journal of Green Engineering, 1(4), 355–381. (Special Issue from WPMC 2010).

    Google Scholar 

  2. Velez, F. J., Nazir, M. K., Aghvami, A. H., Holland, O., & Robalo, D. (2011). Cost/revenue trade-off in the optimization of fixed WiMAX deployment with relays. IEEE Transactions on Vehicular Technology, 60(1), 298–312.

    Article  Google Scholar 

  3. Velez, F. J., Oliveira, J. R., Robalo, D., Holland, O., & Aghvami, H. (2012). Cost/revenue optimization of WiMAX networks with relay power saving modes: measurement-based scenario in a hilly region. In Proceedings of IEEE Globecom 2012: Second international workshop on rural communicationsRuralComm 2012. Anaheim. December 2012.

  4. Niu, Z., Yiqun, W., Gong, J., & Yang, Z. (2010). Cell zooming for cost-efficient green cellular networks. IEEE Communications Magazine, 48(11), 74–79.

    Article  Google Scholar 

  5. Correia, L. M., Zeller, D., Blume, O., Ferling, D., Jading, Y., Gódor, I., et al. (2010). Challenges and enabling technologies for energy aware mobile radio networks. IEEE Communications Magazine, 48(11), 66–72.

    Article  Google Scholar 

  6. Robalo, D., Oliveira, J., Velez, F. J., Petrini, V., Barbiroli, M., Carciofi, C., Grazioso, P., & Fuschini, F. (2011) Experimental propagation characterisation for WiMAX at 3.5 GHz in different environments. In Proceedings of URSI seminar of the Portuguese Committee, Lisbon. November 2011.

  7. Sebastião, P., Velez, F. J., Costa, R., Robalo, D., & Rodrigues, A. (2010). Planning and deployment of WiMAX networks. WIRE. Wireless Personal Communications, 55(3), 305–323. doi:10.1007/s11277-009-9803-3.

    Article  Google Scholar 

  8. Rodhe, & Schwarz. (2010, Sept. 21) [Online]. http://www2.rohde-schwarz.com/en/products/test_and_measurement/spectrum_analysis/FSH4_8-|-Brochures_and_Data_Sheets-|-19-|-4912.html

  9. Erceg, V., Hari, K. V. S., Smith, M. S., Baum, D. S., Sheikh, K. P., Tappenden, C., Costa, J. M., Bushue, C., Sarajedini, A., Schwartz, R., Branlund, D., Kaitz, T., & Trinkwon, D. (2001). “Channel models for fixed wireless applications” tech. rep. IEEE 802.16.3c-01/29r4 IEEE 802.16 Broadband Wireless Access Working Group.

  10. Hoymann, C., Klagges, K., & Schinnenburg, M. (2006). Multi-hop communication in relay enhanced IEEE 802.16 networks. In Proceedings of PIMRC 200617th IEEE international symposium on personal, indoor and mobile radio communications. Helsinki. September 2006.

  11. IEEE Std P802.16j-2009. Air interface for broadband wireless access systems, amendment 1: Multiple relay specification. The Institute of Electrical and Electronics Engineers: New York, NY.

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Acknowledgments

This work was supported by PEst-OE/EEI/LA0008/2013, ICT-SOLDER, OPPORTUNISTIC-CR, PROENERGY-WSN, PTDC/EEA-TEL/120666/2010, CREaTION, COST IC 0905 “TERRA”, ECOOP and IC 1004, PLANOPTI, and by 5G-NORMA. Authors acknowledge contributions from Maria del Camino Noguera and from VIATEL.

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Correspondence to Fernando J. Velez.

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Robalo, D., Oliveira, J.R., Velez, F.J. et al. Dynamic Configuration and Optimization of WiMAX Networks with Relay Power Saving Modes: Measurement-Based Scenario in a Hilly Region. Wireless Pers Commun 85, 937–958 (2015). https://doi.org/10.1007/s11277-015-2818-z

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