An Interference Reduction Strategy for TDD-OFDMA Cellular Systems
Downlink/Uplink (DL/UL) time slot allocation (TSA) in time division duplex (TDD) systems is generally uniform for all the cells. This TSA however is not efficient in case of different traffic asymmetry ratios in different cells. We first propose a new 3-coordinate architecture to identify cells in an orthogonal frequency division multiple access (OFDMA) system where each cell is divided into three sectors. Then, this coordinate system is used to derive a TSA for symmetric traffic. Mathematical analysis and simulations are used to show that the proposed TSA outperforms the traditional all uniform type of TSA in terms of total intercellular interference, even under uniform symmetrical traffic. Two adaptation strategies are further proposed to adjust the proposed TSA to asymmetrical traffic with different DL/UL traffic ratios in different cells. Further simulation results show that the adaptation strategies also yield higher signal-to-interference ratio (SIR).
[1] 3GPP, "Additional Special Subframe Configuration for LTE TDD,” Release 11, June 2013.
[2] Ioannis Spyropoulos and James R. Zeidler, "Supporting Asymmetric Traffic in TDD/CDMA Cellular Network via Interference-Aware Dynamic Channel Allocation and Space-Time LMMSE Joint Detection,” IEEE Transactions on Vehicular Technology, Vol. 58, issue 2, Feb. 2009.
[3] Y. Zhu, Chun-ye Wang, and Da-cheng Yang, "Improving Coarse Frame Synchronization by UE-UE Interference for OFDMA-TDD Systems,” Journal of China Universities of Posts and Telecommunications, 15(4): pp. 30–34, Dec. 2008.
[4] M. Cierny, C. Ribeiro, R. Wichman, and O. Tirkkonen, "Inter-Cell Interference Management in OFDMA TDD Downlink Using Sounding/Silencing Protocol,” In proc. of IEEE 22nd International Symposium on PIMRC, 2011.
[5] P. Chang, Y. Chang, Y. Han. C. Zhang, and D. Yang, "Interference Analysis and Performance Evaluation for LTE TDD System,” In proc. of 2nd International Conference on Advanced Computer Control, 2010.
[6] Peter Omiyi, Harald Haas, and Gunther Auer, "Analysis of TDD Cellular Interference Mitigation Using Busy-Bursts,” IEEE Transactions on Wireless Communications, Vol. 6, NO. 7, July 2007.
[7] Magnus Lindstrom, "Improved TDD Resource Allocation through Inter-Mobile Interference Avoidance”, Proceeding of IEEE Vehicular Technology Conference, volume 2, pp. 1027-1031, VTC Spring 2001.
[8] H. Haas, B. Wegmann, S. Flanz, "Interference Diversity through Random Time Slot Opposing (RTO) in a Cellular TDD System,” Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE, Volume 3, 24-28 Sept. 2002 Page(s):1384 - 1388 vol.3
[9] J. Li, S. Farahvash, M. kavehrad and R. Valenzuela "Dynamic TDD and Fixed Cellular Networks,” IEEE Communications Letters, vol.4, NO.7, July 2000.
[10] Koudjo M. Koumadi and Youngnam Han, "TDD Time Slot Allocation and Interference Analysis for HDD Cellular Systems,” In proceedings of IEEE Asia Pacific Conference and Communications, Aug. 2006.
[11] L. Wang, S. Huang and Y. Tseng "Interference Analysis and Resource Allocation for TDD-CDMA Systems to Support Asymmetric Services by Using Directional Antenna,” IEEE Trans. on Vehicular Technology, Vol. 54, NO. 3, May 2005.
[12] Holm, H.; Povey, G.J.R.; Toskala, A., "Evaluation of Interference Between Uplink and Downlink in UTRA/TDD”, Proceeding of IEEE Vehicular Technology Conference, volume 5, pp. 2616-2620, VTC Fall 1999.
[13] H. Hass, S. McLaughlin and G.J. R Povey, "A Novel Interference Resolving Algorithm for the TDD TD-CDMA Mode in UMTS,” Proc. IntSymp. Personal and Indoor and Mobile Radio communications PIMRC 2000, London, UK, Sept 18-21, 2000 pp 1231-1235.
[14] W. S. Jeon and D.G. Jeong, "Comparison of Time Slot Allocation Strategies for CDMA/TDD Systems”, IEEE Journal on Selected Areas in Communications, Volume 18, NO. 7, July 2000.
[15] J. Lee, Y. Han and D. Kwon, "An Adaptive Time Slot Allocation Strategy for W-CDMA/TDD Systems” Proceeding of IEEE Vehicular Technology Conference, volume 4, pp. 2509-2513, VTC Spring 2001.
[1] 3GPP, "Additional Special Subframe Configuration for LTE TDD,” Release 11, June 2013.
[2] Ioannis Spyropoulos and James R. Zeidler, "Supporting Asymmetric Traffic in TDD/CDMA Cellular Network via Interference-Aware Dynamic Channel Allocation and Space-Time LMMSE Joint Detection,” IEEE Transactions on Vehicular Technology, Vol. 58, issue 2, Feb. 2009.
[3] Y. Zhu, Chun-ye Wang, and Da-cheng Yang, "Improving Coarse Frame Synchronization by UE-UE Interference for OFDMA-TDD Systems,” Journal of China Universities of Posts and Telecommunications, 15(4): pp. 30–34, Dec. 2008.
[4] M. Cierny, C. Ribeiro, R. Wichman, and O. Tirkkonen, "Inter-Cell Interference Management in OFDMA TDD Downlink Using Sounding/Silencing Protocol,” In proc. of IEEE 22nd International Symposium on PIMRC, 2011.
[5] P. Chang, Y. Chang, Y. Han. C. Zhang, and D. Yang, "Interference Analysis and Performance Evaluation for LTE TDD System,” In proc. of 2nd International Conference on Advanced Computer Control, 2010.
[6] Peter Omiyi, Harald Haas, and Gunther Auer, "Analysis of TDD Cellular Interference Mitigation Using Busy-Bursts,” IEEE Transactions on Wireless Communications, Vol. 6, NO. 7, July 2007.
[7] Magnus Lindstrom, "Improved TDD Resource Allocation through Inter-Mobile Interference Avoidance”, Proceeding of IEEE Vehicular Technology Conference, volume 2, pp. 1027-1031, VTC Spring 2001.
[8] H. Haas, B. Wegmann, S. Flanz, "Interference Diversity through Random Time Slot Opposing (RTO) in a Cellular TDD System,” Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE, Volume 3, 24-28 Sept. 2002 Page(s):1384 - 1388 vol.3
[9] J. Li, S. Farahvash, M. kavehrad and R. Valenzuela "Dynamic TDD and Fixed Cellular Networks,” IEEE Communications Letters, vol.4, NO.7, July 2000.
[10] Koudjo M. Koumadi and Youngnam Han, "TDD Time Slot Allocation and Interference Analysis for HDD Cellular Systems,” In proceedings of IEEE Asia Pacific Conference and Communications, Aug. 2006.
[11] L. Wang, S. Huang and Y. Tseng "Interference Analysis and Resource Allocation for TDD-CDMA Systems to Support Asymmetric Services by Using Directional Antenna,” IEEE Trans. on Vehicular Technology, Vol. 54, NO. 3, May 2005.
[12] Holm, H.; Povey, G.J.R.; Toskala, A., "Evaluation of Interference Between Uplink and Downlink in UTRA/TDD”, Proceeding of IEEE Vehicular Technology Conference, volume 5, pp. 2616-2620, VTC Fall 1999.
[13] H. Hass, S. McLaughlin and G.J. R Povey, "A Novel Interference Resolving Algorithm for the TDD TD-CDMA Mode in UMTS,” Proc. IntSymp. Personal and Indoor and Mobile Radio communications PIMRC 2000, London, UK, Sept 18-21, 2000 pp 1231-1235.
[14] W. S. Jeon and D.G. Jeong, "Comparison of Time Slot Allocation Strategies for CDMA/TDD Systems”, IEEE Journal on Selected Areas in Communications, Volume 18, NO. 7, July 2000.
[15] J. Lee, Y. Han and D. Kwon, "An Adaptive Time Slot Allocation Strategy for W-CDMA/TDD Systems” Proceeding of IEEE Vehicular Technology Conference, volume 4, pp. 2509-2513, VTC Spring 2001.
@article{"International Journal of Information, Control and Computer Sciences:66693", author = "Koudjo M. Koumadi and Kester Quist-Aphetsi and Robert A. Sowah and Amevi Acakpovi", title = "An Interference Reduction Strategy for TDD-OFDMA Cellular Systems", abstract = "Downlink/Uplink (DL/UL) time slot allocation (TSA) in time division duplex (TDD) systems is generally uniform for all the cells. This TSA however is not efficient in case of different traffic asymmetry ratios in different cells. We first propose a new 3-coordinate architecture to identify cells in an orthogonal frequency division multiple access (OFDMA) system where each cell is divided into three sectors. Then, this coordinate system is used to derive a TSA for symmetric traffic. Mathematical analysis and simulations are used to show that the proposed TSA outperforms the traditional all uniform type of TSA in terms of total intercellular interference, even under uniform symmetrical traffic. Two adaptation strategies are further proposed to adjust the proposed TSA to asymmetrical traffic with different DL/UL traffic ratios in different cells. Further simulation results show that the adaptation strategies also yield higher signal-to-interference ratio (SIR).
", keywords = "Crossed TSA, different-entity interference, same-entity interference, uniform TSA", volume = "8", number = "1", pages = "209-6", }
