This Article 
   
 Share 
   
 Bibliographic References 
   
 Add to: 
 
Digg
Furl
Spurl
Blink
Simpy
Google
Del.icio.us
Y!MyWeb
 
 Search 
   
Cellular CDMA Capacity with Out-of-Band Multihop Relaying
February 2006 (vol. 5 no. 2)
pp. 170-178
In this paper, we consider the capacity of cellular code division multiple access (CDMA) when there is out-of-band ad hoc traffic relaying. The mobile stations (MSs) are dual-mode, having both ad hoc and cellular CDMA radios. An active MS is free to choose any available relay station (RS) within its ad hoc radio coverage area for dual-hop communication with the CDMA base station (BS). Communications between the RSs and the MSs use bandwidth which is available to the ad hoc radio and does not consume the CDMA capacity. Using this mechanism, CDMA interference can be reduced by dynamically selecting RSs which have more favorable CDMA link characteristics. Several relay station selection criteria are considered, namely, ad hoc relaying with low relative interference (ARRI), with best link gain (ARLG), and with shortest distance (ARSD). The relay station selection protocols are compatible with existing wireless local area network (WLAN) standards such as IEEE 802.11. An analytic model is used to compute the effects on uplink and downlink CDMA capacities when out-of-band relaying is added. The results show that very significant capacity improvements are possible by using these criteria compared with conventional CDMA with hard or soft handoff. Ad hoc relaying which dynamically tracks CDMA link quality can achieve greater capacity improvements than that using a distance-based relay station selection. Relaying, which considers both signal and interference conditions, achieves better capacity than that based on signal link quality alone.

[1] K.S. Gilhousen, I.M. Jacobs, R. Padovani, A.J. Viterbi, L.A. Weaver, and C.E. Wheatley, “On the Capacity of a Cellular CDMA System,” IEEE Trans. Vehicular Technology, vol. 40, no. 2, pp. 303-312, May 1991.
[2] V.V. Veeravalli and A. Sendonaris, “The Coverage-Capacity Tradeoff in Cellular CDMA Systems,” IEEE Trans. Vehicular Technology, vol. 48, no. 4, pp. 1443-1450, Sept. 1999.
[3] IEEE Standards Department, IEEE Draft Standard— Wireless LAN. IEEE Press, 1996.
[4] G.N. Aggelou and R. Tafazolli, “On the Relaying Capability of Next-Generation GSM Cellular Networks,” IEEE Personal Comm., vol. 8, no. 1, pp. 40-47, Feb. 2001.
[5] T. Adachi and M. Nakagawa, “Capacity Analysis for a Hybrid Indoor Mobile Communication System Using Cellular and Ad-Hoc Modes,” Proc. 11th IEEE Int'l Symp. Personal, Indoor, and Mobile Radio Comm. (PIMRC 2000), vol. 2, pp. 767-771, Sept. 2000.
[6] R.-S. Chang, W.-Y. Chen, and Y.-F. Wen, “Hybrid Wireless Network Protocols,” IEEE Trans. Vehicular Technology, vol. 52, no. 4, pp. 1099-1109, July 2003.
[7] X. Wu, S-H.G. Chan, and B. Mukherjee, “MADF: A Novel Approach to Add an Ad-Hoc Overlay on a Fixed Cellular Infrastructure,” Proc. IEEE Wireless Comm. and Networking Conf. (WCNC2000), vol. 2, pp. 549-554, Sept. 2000.
[8] C. Qiao and H. Wu, “ICAR: An Integrated Cellular and Ad-Hoc Relay System,” Proc. Ninth Int'l Conf. Computer Comm. and Networks, pp. 154-161, Oct. 2000.
[9] Y.-D. Lin and Y-C. Hsu, “Multihop Cellular: A New Architecture for Wireless Communications,” Proc. IEEE INFOCOM 2000, vol. 3, pp. 1273-1282, Mar. 2000.
[10] B.S. Manoj, R. Ananthapadmanabha, and C.S.R. Murthy, “Multi-Hop Cellular Networks: The Architecture and Routing Protocols,” Proc. 12th IEEE Int'l Symp. Personal, Indoor, and Mobile Radio Comm., vol. 2, pp. G78-G82, 2001.
[11] T. Rouse, I. Band, and S. McLaughlin, “Capacity and Power Investigation of Opportunity Driver Multiple Access (ODMA) Networks in TDD-CDMA Based Systems,” Proc. IEEE Int'l Conf. Comm., 2002.
[12] V. Sreng, H. Yanikomeroglu, and D. Falconer, “Coverage Enhancement through Two-Hop Relaying in Cellular Radio Systems,” IEEE Wireless Comm. and Networking Conf. (WCNC02), pp. 881-885, Mar. 2002.
[13] V. Sreng, H. Yanikomeroglu, and D. Falconer, “Relayer Selection Strategies in Cellular Networks with Peer-to-Peer Relaying,” IEEE Vehicular Technology Conf., pp. 1949-1953, Oct. 2003.
[14] H.H. Yap, X. Yang, S. Ghaheri-Niri, and R. Tafazolli, “Position Assisted Relaying and Handover in Hybrid Ad Hoc WCDMA Cellular System,” Proc. 13th IEEE Int'l Symp. Personal, Indoor, and Mobile Radio Comm. (PIMRC2003), pp. 2194-2198, Sept. 2002.
[15] T.J. Harrold and A.R. Nix, “Performance Analysis of Intelligent Relaying in UTRA TDD,” Proc. IEEE Vehicular Technology Conf. 2002 Fall, vol. 3, pp. 1374-1378, Sept. 2002.
[16] T. Todd and D. Zhao, “Cellular CDMA Capacity in Hotspots with Limited Ad Hoc Relaying,” Proc. 14th IEEE Int'l Symp. Personal, Indoor, and Mobile Radio Comm. (PIMRC2003), pp. 2828-2832, Sept. 2003.
[17] Metricom Inc., “The Ricochet Network,” http:/www.ricochet. com/, 2005.
[18] Nokia Networks Inc., “Nokia Rooftop Wireless Routing,” http://www.nwr.nokia.comrooftop/, 2002.
[19] L. Jorguseski, E. Fledderus, J. Farserotu, and R. Prasad, “Radio Resource Allocation in Third-Generation Mobile Communication Systems,” IEEE Comm. Magazine, vol. 39, no. 2, pp. 117-123, Feb. 2001.
[20] T.S. Rappaport, Wireless Communications: Principles and Practice. Englewood Cliffs, N.J.: Prentice-Hall, 1996.
[21] R.S. Varga, Matrix Iterative Analysis, chapter 2. Englewood Cliffs, N.J.: Prentice-Hall, 1962.
[22] A.J. Viterbi, A.M. Viterbi, K.S. Gilhousen, and E. Zehavi, “Soft Handoff Extends CDMA Cell Coverage and Increases Reverse Link Capacity,” IEEE J. Selected Areas in Comm., vol. 12, no. 8, pp. 1281-1288, Oct. 1994.
[23] H. Furukawa, K. Hambe, and A. Ushirokawa, “SSDT-Site Selection Diversity Transmission Power Control for CDMA Forward Link,” IEEE J. Selected Areas in Comm., vol. 18, no. 8, pp. 1546-1554, Aug. 2000.

Index Terms:
Index Terms- Wireless communication networks, cellular CDMA, multihop relaying, capacity analysis.
Citation:
Dongmei Zhao, Terence D. Todd, "Cellular CDMA Capacity with Out-of-Band Multihop Relaying," IEEE Transactions on Mobile Computing, vol. 5, no. 2, pp. 170-178, Feb. 2006, doi:10.1109/TMC.2006.17
Usage of this product signifies your acceptance of the Terms of Use.