Manuscript received December 15, 2009; revised February 16, 2010. Date of current version May 21, 2010. Paper no. TSG-00027-2009.
K. Moslehi is with ABB Network Management, Santa Clara, CA 95050 USA
ail: Khosrow.Moslehi@us.abb.com).
R. Kumar resides in Cupertino, CA 95014-2843 USA.
Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org.
Digital Object Identifier 10.1109/TSG.2010.2046346