Multihop Cooperative Transmissions for Asymmetric Traffic Accommodation in CDMA/FDD Cellular Networks

Authors: Kazuo Mori, Takeo Saga, Katsuhiro Naito, Hideo Kobayashi

Abstract:

The asymmetric trafc between uplink and downlink over recent mobile communication systems has been conspicuous because of providing new communication services. This paper proposes an asymmetric trafc accommodation scheme adopting a multihop cooperative transmission technique for CDMA/FDD cellular networks. The proposed scheme employs the cooperative transmission technique in the already proposed downlink multihop transmissions for the accommodation of the asymmetric trafc, which utilizes the vacant uplink band for the downlink relay transmissions. The proposed scheme reduces the transmission power at the downlink relay transmissions and then suppresses the interference to the uplink communications, and thus, improves the uplink performance. The proposed scheme is evaluated by computer simulation and the results show that it can achieve better throughput performance.

Keywords: asymmetric traffic, cooperative transmissions, multihop transmissions, CDMA, FDD, cellular systems

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1077467

References:

[1] L. Chen, S. Yoshida, H. Murata, and S. Hirose, “A dynamic timeslot assignment algorithm for asymmetric trafc in multimedia TDMA/TDD mobile radio,” IEICE Trans. Fundamentals, vol. E81-A, no. 7, pp. 1358– 1366, July 1998.
[2] D. G. Jeong and W. S. Jeon, “CDMA/TDD system for wireless multimedia service with trafc unbalance between uplink and downlink,” IEEE J. Select. Areas Commun., vol. 17, no. 5, pp. 939–946, May 1999.
[3] K. Mori and T. Kobayashi, “Downlink Transmission Power Control for CDMA/Shared–TDD Packet Communications in Cellular Environments,” IEICE Trans. Commun., vol. E84-B, no. 6, pp. 1622–1630, June 2001.
[4] J. Nasreddine and X. Lagrange, “Time slot allocation based on a path gain division scheme for TD-CDMA TDD systems,” Proc. IEEE VTC2003- Spring, vol.2, pp.1410–1414, April 2003.
[5] J. Nasreddine and X. Lagrange, “Performance of TD-CDMA systems during crossed slots,” Proc. IEEE VTC2004-Fall, vol.2, pp.798–802, Sept. 2004.
[6] K. Mori, T. Nagaosa, and H. Kobayashi, “Uplink packet transmission control for asymmetric trafc in CDMA/Shared–TDD cellular packet communications,” IEICE Trans. Commun., vol. E86-B, no. 9, pp. 2620– 2627, Sept. 2003.
[7] Y. Kobayashi, K. Mori, and H. Kobayashi, “Asymmetric radio resource assignment scheme for connection-less services in CDMA/shared–TDD cellular packet Communications,” IEICE Trans. Fundamentals, vol. E88- A, no. 7, pp. 1903–1911, July 2005.
[8] K. Mori, K. Naito, and H. Kobayashi, “Downlink multihop transmission technique for asymmetric trafc accommodation in DS-CDMA/FDD cellular communications,” IEICE Trans. Commun., Vol.E91-B, no.10, pp.3122-3131, Oct. 2008
[9] K. Mori, K. Naito, H. Kobayashi, and H. Aghvami, “Asymmetric trafc accommodation using adaptive cell sizing technique for CDMA/FDD cellular packet communications,” IEICE Trans. Fundamentals, Vol.E90- A, no.7, pp.1271-1279, July 2007
[10] Y-D. Lin and Y-C. Hsu, “Multihop cellular: a new architecture,” Proc. IEEE INFOCOM2000, vol.3, pp.1273–1282, 2000.
[11] A. Nosratinia, T.E. Hunter, and A. Hedayat, “Cooperative communication in wireless networks,” IEEE Commun. Mag., vol.42, no.10, pp.74-80, Oct. 2004.
[12] A. Fujiwara, S. Takeda, H. Yoshino, T. Otsu, and Y. Yamao, “Capacity improvement with a multi-hop access scheme in broadband CDMA cellular systems,” IEICE Trans.Commun., vol.J-85-B, no.12, pp2073- 2079, Dec. 2002. (in Japanese)
[13] T. Nagasawa, K. Naito, K. Mori, and H. Kobayashi, “Transmission power reduction scheme using multi-hop connection in CDMA cellular systems with non-uniform trafc,” Proc. IEEE APWCS2005, pp.50–54, Aug. 2005.
[14] E. Kudoh and F. Adachi, “Transmit power efciency of multi-hop MRC diversity for a virtual cellular network,” IEICE Trans. Commun., vol.88-B, no.9, pp.3643-3648, Oct. 2004.
[15] A. Goldsmith, Wireless communications, Cambridge University Press, 2005
[16] ETSI/SMG2, “The ETSI UMTS Terrestrial Radio Access (UTRA) ITUR RTT Candidate Submission,” submitted to ITU-R TG 8/1 as a candidate for IMT-2000, Oct. 1998.
[17] K. Mori, T. Kobayashi, T. Yamazato, and A. Ogawa, “Service fairness in CDMA cellular packet systems with site diversity reception,” IEICE Trans. Commun., vol.E82-B, no.12, pp.1964–1973, Dec. 1999.