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Towards Achieving the Maximum Capacity in Large Mobile Wireless Networks under Delay Constraints

Lin, Xiaojun   Shroff, Ness B.  
  • 초록

    In this paper, we study how to achieve the maximum capacity under delay constraints for large mobile wireless networks. We develop a systematic methodology for studying this problem in the asymptotic region when the number of nodes n in the network is large. We first identify a number of key parameters for a large class of scheduling schemes, and investigate the inherent tradeoffs among the capacity, the delay, and these scheduling parameters. Based on these inherent tradeoffs, we are able to compute the upper bound on the maximum per-node capacity of a large mobile wireless network under given delay constraints. Further, in the process of proving the upper bound, we are able to identify the optimal values of the key scheduling parameters. Knowing these optimal values, we can then develop scheduling schemes that achieve the upper bound up to some logarithmic factor, which suggests that our upper bound is fairly tight. We have applied this methodology to both the i.i.d. mobility model and the random way-point mobility model. In both cases, our methodology allows us to develop new scheduling schemes that can achieve larger capacity than previous proposals under the same delay constraints. In particular, for the i.i.d. mobility model, our scheme can achieve (n-1/3/log3/2 n) per-node capacity with constant delay. This demonstrates that, under the i.i.d. mobility model, mobility increases the capacity even with constant delays. Our methodology can also be extended to incorporate additional scheduling constraints.


  • 주제어

    capacity under delay tradeoff .   large system asymptotics .   mobile and hoc network .   mobile wireless network.  

  • 참고문헌 (12)

    1. M. Grossglauser and D. Tse, 'Mobility increases the capacity of ad hocwireless networks,' IEEE/ACM Trans. Networking, vol. 10, Aug. 2002 
    2. G. Sharma and R. R. Mazumdar, 'Delay and capacity tradeoffs for wireless ad hoc networks with random mobility,' preprint, available at http://www.ece.purdue.edu/-mazum/, Oct. 2003 
    3. R. Durrett, Probability: Theory and Examples, 2nd ed., Belmont, CA: Duxbury Press, 1996 
    4. G. Sharma and R. R. Mazumdar, 'On achievable delay/capacity trade-offs in mobile ad hoc networks,' in Proc. Workshop on Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks (WIOPT), Cambridge, UK, Mar. 2004 
    5. N. Bansal and Z. Liu, 'Capacity, delay, and mobility in wireless ad hoc networks,' in Proc. IEEE INFOCOM 2003, San Francisco, CA, Apr. 2003 
    6. S. Diggavi, M. Grossglauser, and D. Tse, 'Even one-dimensional mobility increases ad hoc wireless capacity,' in Proc. ISIT 2002, Lausanne, Switzerland, June 2002 
    7. P. Gupta and P. R. Kumar, 'The capacity of wireless networks,' IEEE Trans. Inform. Theory, vol. 46, pp. 388-404, Mar. 2000 
    8. X. Lin and N. B. Shroff, 'The fundamental capacity delay tradeoff in large mobile ad hoc networks,' Technical Report, Purdue University, available at http://min.ecn.purdue.edu/-linx/papers.html, 2004 
    9. A. E. Gamal et al., 'Throughput delay trade off in wireless networks,' in Proc. IEEE INFOCOM 2004, Hong Kong, China, Mar. 2004 
    10. S. Toumpis and A. J. Goldsmith, 'Large wireless networks under fading, mobility, and delay constraints,' in Proc. IEEE INFOCOM 2004, Hong Kong, China, Mar. 2004 
    11. M. J. Neely and E. Modiano, 'Capacity and delay tradeoffs for ad hoc mobile networks,' submitted to IEEE Trans. Inform. Theory, available at http://www-rcf.usc.edu/-mjneely/, 2003 
    12. X. Lin and N. B. Shroff, 'The fundamental capacity delay tradeoff in large mobile ad hoc networks,' in Proc. Third Annual Mediterranean AdHoc Networking Workshop, Bodrum, Turkey, June 2004 

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