A Scheduling Framework for UWB & Cellular Networks

  • Authors:
  • Arjunan Rajeswaran;Gyouhwan Kim;Rohit Negi

  • Affiliations:
  • Carnegie Mellon University;Carnegie Mellon University;Carnegie Mellon University

  • Venue:
  • BROADNETS '04 Proceedings of the First International Conference on Broadband Networks
  • Year:
  • 2004

Quantified Score

Hi-index 0.00

Visualization

Abstract

The max-min fair scheduling problem in wireless ad-hoc networks is a non-convex optimization problem. A general framework is presented for this optimization problem and analyzed to obtain a dual problem, which involves solving a series of optimization sub-problems. In the limit of infinite bandwidth (W 驴 驴), the scheduling solution reduces to simultaneous transmission (spread spectrum) on all links [Capacity of power constrained ad-hoc networks].This motivates the analysis of teh scheduling problem in teh Ultra Wide Band (UWB) regime (w 驴 1, but finite), a model for certain practical radios.A quadratic (in 1/W) lower bound to the single link capacity function is developed, which simplifies the dual sub-problem to a quadratic optimization [Scheduling and Power Adaption for Networks in the Ultra Wide Band Regime].The solution to this sub-problem is then obtained under both total power and power spectral density constraints.This solution is utilized to iteratively construct the schedule (sub-band sizes) and power allocation, thus optimally solving the UWB max-mix fair scheduling problem, to within any desired precision.Simulations on medium sized networks demonstrate the excellent performance of this scheme.A cellular architecture (not necessarily UWB) may also be considered in this framework. It is proved that Frequency Division Multiple Access is the optimal scheduling for a multi-band cellular architectures.