[1] Toshiba Co Ltd, Tokyo, Japan
[2] Hiroshima City Univ, Hiroshima, Japan
[3] Hokkaido Univ, Sapporo, Hokkaido, Japan
[4] Yokohama Natl Univ, Yokohama, Kanagawa, Japan
[5] European Telecommun Stand Inst ETSI, TC Smart BAN, Sophia Antipolis, France
[6] Int Electrotech Commiss IEC, Syst Comm Active Assisted Living SyC AAL, WG 1 User Focus, Geneva, Switzerland