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268
A Mobile Multihop Relay Dynamic TDD Scheme for Cellular Networks
Abstract:
In this paper, we present an analytical framework for the evaluation of the uplink performance of multihop cellular networks based on dynamic time division duplex (TDD). New wireless broadband protocols, such as WiMAX, WiBro, and 3G-LTE apply TDD, and mobile communication protocols under standardization (e.g., IEEE802.16j) are investigating mobile multihop relay (MMR) as a future technology. In this paper a novel MMR TDD scheme is presented, where the dynamic range of the frame is shared to traffic resources of asymmetric nature and multihop relaying. The mobile communication channel interference model comprises of inner and co-channel interference (CCI). The performance analysis focuses on the uplink due to the fact that the effects of dynamic resource allocation show significant performance degradation only in the uplink compared to time division multiple access (TDMA) schemes due to CCI [1-3], where the downlink results to be the same or better.The analysis was based on the signal to interference power ratio (SIR) outage probability of dynamic TDD (D-TDD) and TDMA systems,which are the most widespread mobile communication multi-user control techniques. This paper presents the uplink SIR outage probability with multihop results and shows that the dynamic TDD scheme applying MMR can provide a performance improvement compared to single hop applications if executed properly.
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References:

[1] J. Li, S. Farahvash, M. Kavehrad, ''Dynamic Time-Division-Duplex Wireless Local Loop'' in Proc. IEEE Vehicular Technology Conf., vol. 3,pp.1078-1085, Boston, MA, Sept. 2000.
[2] J. Li, S. Farahvash, M. Kavehrad, ''Dynamic TDD and Fixed CellularNetworks,'' IEEE Commun. Letters, vol. 4, no. 7, pp. 218-220, July 2000.
[3] W. C. Jeong, M. Kavehrad, ''Cochannel Interference Reduction in Dynamic-TDD Fixed Wireless Applications, Using Time Slot Allocation Algorithms,'' IEEE Trans. Commun., vol. 50, no.1, pp.1627-1636, Oct.2002.
[4] B. S. Bae, D. H. Cho, ''An Integrated Scheduling Algorithm in a Wireless Packet Network with Dynamic TDD,'' in Proc. IEEE 50th Vehicular Technology Conference (VTC 1999-Fall), 1999.
[5] H. Wu, C. Qiao, S. De, O. Tonguz, ''Integrated Cellular and Ad Hoc Relaying Systems: iCAR,'' IEEE JSAC, vol. 19, pp. 2105-2115, Oct.2001.
[6] M. DeFaria, E. S. Sousa, ''Effect of Intercell Interference on the SINR of a Multihop Cellular Network,'' Vehicular Technology Conference, 2005. VTC 2005-Spring. 2005 IEEE 61st, vol. 5, pp. 3107- 3111, May 2005.
[7] Z. Dawy, S. Davidovic, I. Oikonomidis, ''Coverage and Capacity Enhancement of CDMA Cellular Systems via Multihop Transmission,'' in Proc. IEEE GLOBECOM 2003, pp. 1147-1151, 2003.
[8] R. Prasad, ''Universal Wireless Personal Communications,'' Artech House,1998.
[9] S.C.Schwartz and Y. S. Yeh, ''On the distribution function and momentsof power sums with lognormal interferers,'' Bell Syst. Tech. J., vol. 61,pp.1441-1462, Sept. 1982.
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