Welcome to the last issue of the year 2011. In this issue, we bringto you three research papers. We are also pleased to introduce Research Essay section in this issue. The idea behind this initiative is to invite academic/industry experts to write a short essay on the emerging technology, business and policy trends in the area of data communications and networking. We hope that this will provide our readers a look-ahead and synergistic view of this rapidly evolving field.
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