We would like to thank Ichiro Okajima, of NTT DoCoMo, for providing us with valuable questions and suggestions during our MPA discussions, Trevor Holt of Nortel Networks for bringing to our attention related work on PIP and IDIP, and Armando Fox for his encouragement.
This research has been supported by a gift from NTT Mobile Communications Network, Inc. (NTT DoCoMo), a grant from the Keio Research Institute at SFC, Keio University and the Information-technology Promotion Agency in Japan, and a grant from the Okawa Foundation.