Performance Analysis of Relay Site Planning Over Composite Fading/Shadowing Channels With Cochannel Interference

The performance of relay deployments depends significantly on the capacity of the wireless relay link between a relay node (RN) and its serving base station (BS). Exploiting the deployment flexibility of RNs, relay site planning (RSP) can be utilized to overcome the limitations of the relay link. In particular, RSP is carried out by selecting RN deployment locations from a discrete set of alternatives considering the signal-to-interference-plus-noise ratio (SINR) on the relay link as the selection criterion. In this paper, we present an analytical framework for RSP that can be used for planning and dimensioning of two-hop cellular relay networks operating over composite fading/shadowing channels in the presence of cochannel interference. Nakagami–lognormal distribution is used to model the relay link, whereas the access link between a mobile terminal (MT) and its serving RN is modeled by Rician–lognormal distribution. As these composite models do not have closed-form distribution functions, we utilize mixture gamma (MG) distribution to accurately approximate them. Further, the total cochannel interference in the considered multicellular system is approximated using the moment-generating function (MGF) matching method. Accordingly, we present closed-form expressions for the distributions of relay-link SINR, link rates, and end-to-end rate. In addition, RSP is shown to effectively decrease the amount of fading (AoF) and, thus, mitigate the detrimental effects of composite fading/shadowing. Thorough results reveal significant performance improvements, which justify the use of RSP in cellular relay networks.

[1]  Gordon L. Stuber,et al.  Principles of mobile communication (2nd ed.) , 2001 .

[2]  F. D. Colavecchia,et al.  Multivariable hypergeometric functions for ion-atom collisions , 1999 .

[3]  Jose F. Paris,et al.  Closed-form expressions for Rician shadowed cumulative distribution function , 2010 .

[4]  S. Redana,et al.  Business Impact of Relay Deployment for Coverage Extension in 3GPP LTE-Advanced , 2009, 2009 IEEE International Conference on Communications Workshops.

[5]  Ainslie,et al.  CORRELATION MODEL FOR SHADOW FADING IN MOBILE RADIO SYSTEMS , 2004 .

[6]  Simone Redana,et al.  Comparison of Relay and Pico eNB Deployments in LTE-Advanced , 2009, 2009 IEEE 70th Vehicular Technology Conference Fall.

[7]  Sofiène Affes,et al.  Performance analysis of mobile radio systems over composite fading/shadowing channels with co-located interference , 2009, IEEE Transactions on Wireless Communications.

[8]  Hai Jiang,et al.  A Mixture Gamma Distribution to Model the SNR of Wireless Channels , 2011, IEEE Transactions on Wireless Communications.

[9]  Risto Wichman,et al.  Dynamic Resource Assignment and Cooperative Relaying in Cellular Networks: Concept and Performance Assessment , 2009, EURASIP J. Wirel. Commun. Netw..

[10]  Bernhard Walke,et al.  An FDD Multihop Cellular Network for 3GPP-LTE , 2008, VTC Spring 2008 - IEEE Vehicular Technology Conference.

[11]  Norman C. Beaulieu,et al.  Microdiversity on Rician fading channels , 1994, IEEE Trans. Commun..

[12]  Ali Abdi,et al.  A new simple model for land mobile satellite channels: first- and second-order statistics , 2003, IEEE Trans. Wirel. Commun..

[13]  W. Zirwas,et al.  Capacity and Coverage Analysis of a 3GPP-LTE Multihop Deployment Scenario , 2008, ICC Workshops - 2008 IEEE International Conference on Communications Workshops.

[14]  Simone Redana,et al.  Performance Enhancement in LTE-Advanced Relay Networks via Relay Site Planning , 2010, 2010 IEEE 71st Vehicular Technology Conference.

[15]  Simone Redana,et al.  On the Coverage Extension and Capacity Enhancement of Inband Relay Deployments in LTE-Advanced Networks , 2010, J. Electr. Comput. Eng..

[16]  I. Miller.  Probability, Random Variables, and Stochastic Processes , 1966 .

[17]  L. Fenton.  The Sum of Log-Normal Probability Distributions in Scatter Transmission Systems , 1960 .

[18]  Chun Loo,et al.  A statistical model for a land mobile satellite link , 1985, IEEE Transactions on Vehicular Technology.

[19]  B. Timus,et al.  Cost analysis issues in a wireless multihop architecture with fixed relays , 2005, 2005 IEEE 61st Vehicular Technology Conference.

[20]  P. Mohana Shankar.  Performance Analysis of Diversity Combining Algorithms in Shadowed Fading Channels , 2006, Wirel. Pers. Commun..

[21]  Simone Redana,et al.  Impact of power control optimization on the system performance of relay based LTE-Advanced heterogeneous networks , 2011, Journal of Communications and Networks.

[22]  Stefan Panic,et al.  Outage analysis of selection diversity over Rayleigh fading channels with multiple co-channel interferers , 2013, Telecommun. Syst..

[23]  Preben E. Mogensen,et al.  LTE Capacity Compared to the Shannon Bound , 2007, 2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring.

[24]  Simone Redana,et al.  Impact of preconditioning on the convergence of numerical co-channel interference approximations in heterogeneous networks , 2011, 2011 7th International Wireless Communications and Mobile Computing Conference.

[25]  Simone Redana,et al.  Analysis of the Impact of Site Planning on the Performance of Relay Deployments , 2012, IEEE Transactions on Vehicular Technology.

[26]  Yifei Yuan,et al.  IMT-advanced relay standards [WiMAX/LTE Update] , 2010, IEEE Communications Magazine.

[27]  E. Zehavi,et al.  Soft handoff extends CDMA cell coverage and increases reverse link capacity , 1994, IEEE J. Sel. Areas Commun..

[28]  Hai Jiang,et al.  Representation of Composite Fading and Shadowing Distributions by Using Mixtures of Gamma Distributions , 2010, 2010 IEEE Wireless Communication and Networking Conference.

[29]  Jingxian Wu,et al.  Approximating a Sum of Random Variables with a Lognormal , 2007, IEEE Transactions on Wireless Communications.

[30]  Theodore S. Rappaport,et al.  Statistical analysis of co-channel interference in wireless communications systems‡ , 2001 .

[31]  P. W. Karlsson,et al.  Multiple Gaussian hypergeometric series , 1985 .

[32]  Mohamed-Slim Alouini,et al.  Coded Communication over Fading Channels , 2005 .

[33]  M. Abramowitz,et al.  Handbook of Mathematical Functions With Formulas, Graphs and Mathematical Tables (National Bureau of Standards Applied Mathematics Series No. 55) , 1965 .

[34]  Simone Redana,et al.  Effect of Relaying on Coverage in 3GPP LTE-Advanced , 2009, VTC Spring 2009 - IEEE 69th Vehicular Technology Conference.

[35]  Niklas Johansson,et al.  Performance and Cost Evaluation of Fixed Relay Nodes in Future Wide Area Cellular Networks , 2007, 2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications.

[36]  Ben Liang,et al.  Effect of relaying on capacity improvement in wireless local area networks , 2005, IEEE Wireless Communications and Networking Conference, 2005.

[37]  Mohamed-Slim Alouini,et al.  On the Performance Analysis of Composite Multipath/Shadowing Channels Using the G-Distribution , 2008, 2008 IEEE International Conference on Communications.