Skip to main content

Capacity Planning for Group-Mobility Users in OFDMA Wireless Networks

Abstract

Because of the random nature of user mobility, the channel gain of each user in a cellular network changes over time causing the signal-to-interference ratio (SNR) of the user to fluctuate continuously. Ongoing connections may experience outage events during periods of low SNR. As the outage ratio depends on the SNR statistics and the number of connections admitted in the system, admission capacity planning needs to take into account the SNR fluctuations. In this paper, we propose new methods for admission capacity planning in orthogonal frequency-division multiple-access (OFMDA) cellular networks which consider the randomness of the channel gain in formulating the outage ratio and the excess capacity ratio. Admission capacity planning is solved by three optimization problems that maximize the reduction of the outage ratio, the excess capacity ratio, and the convex combination of them. The simplicity of the problem formulations facilitates their solutions in real time. The proposed planning method provides an attractive means for dimensioning OFDMA cellular networks in which a large fraction of users experience group-mobility.

[123456789101112]

References

  1. 1.

    Wong CY, Cheng RS, Letaief KB, Murch RD: Multiuser OFDM with adaptive subcarrier, bit, and power allocation. IEEE Journal on Selected Areas in Communications 1999,17(10):1747-1758. 10.1109/49.793310

    Article  Google Scholar 

  2. 2.

    Kivanc D, Li G, Liu H: Computationally efficient bandwidth allocation and power control for OFDMA. IEEE Transactions on Wireless Communications 2003,2(6):1150-1158. 10.1109/TWC.2003.819016

    Article  Google Scholar 

  3. 3.

    Ergen M, Coleri S, Varaiya P: Qos aware adaptive resource allocation techniques for fair scheduling in OFDMA based broadband wireless access systems. IEEE Transactions on Broadcasting 2003,49(4):362-370. 10.1109/TBC.2003.819051

    Article  Google Scholar 

  4. 4.

    Mohanram C, Bhashyam S: A sub-optimal joint subcarrier and power allocation algorithm for multiuser OFDM. IEEE Communications Letters 2005,9(8):685-687. 10.1109/LCOMM.2005.1496582

    Article  Google Scholar 

  5. 5.

    Zhang YJ, Letaief KB: Multiuser adaptive subcarrier-and-bit allocation with adaptive cell selection for OFDM systems. IEEE Transactions on Wireless Communications 2004,3(5):1566-1575. 10.1109/TWC.2004.833501

    Article  Google Scholar 

  6. 6.

    Han Z, Ji Z, Ray Liu KJ: Fair multiuser channel allocation for OFDMA networks using Nash bargaining solutions and coalitions. IEEE Transactions on Communications 2005,53(8):1366-1376. 10.1109/TCOMM.2005.852826

    Article  Google Scholar 

  7. 7.

    Yao Y, Giannakis GB: Rate-maximizing power allocation in OFDM based on partial channel knowledge. IEEE Transactions on Wireless Communications 2005,4(3):1073-1083.

    Article  Google Scholar 

  8. 8.

    Niyato D, Hossain E: Connection admission control algorithms for OFDM wireless networks. Proceedings of IEEE Global Telecommunications Conference (GLOBECOM '05), November-December 2005, St. Louis, Mo, USA 2455-2459.

    Google Scholar 

  9. 9.

    Wang L-C, Huang S-Y, Tseng Y-C: Interference analysis and resource allocation for TDD-CDMA systems to support asymmetric services by using directional antennas. IEEE Transactions on Vehicular Technology 2005,54(3):1056-1069. 10.1109/TVT.2005.844660

    Article  Google Scholar 

  10. 10.

    Casoni M, Immovilli G, Merani ML: Admission control in T/CDMA systems supporting voice and data applications. IEEE Transactions on Wireless Communications 2002,1(3):540-548. 10.1109/TWC.2002.800552

    Article  Google Scholar 

  11. 11.

    Ross S: Stochastic Processes. 2nd edition. John Wiley & Sons, New York, NY, USA; 1996.

    Google Scholar 

  12. 12.

    Lee K-D: Variable-target admission control for nonstationary handover traffic in LEO satellite networks. IEEE Transactions on Vehicular Technology 2005,54(1):127-135. 10.1109/TVT.2004.838893

    Article  Google Scholar 

Download references

Author information

Affiliations

Authors

Corresponding author

Correspondence to Ki-Dong Lee.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Lee, K., Leung, V.C.M. Capacity Planning for Group-Mobility Users in OFDMA Wireless Networks. J Wireless Com Network 2006, 075820 (2006). https://doi.org/10.1155/WCN/2006/75820

Download citation

Keywords

  • Wireless Network
  • Problem Formulation
  • User Experience
  • Cellular Network
  • User Mobility