The IFIP TC-6 9th International Conference on Personal Wireless Communi- tions, PWC 2004 is the main conference of the IFIP Working Group 6. 8, Mobile and Wireless Communications. The ?eld of personal wireless communications is steadily growing in imp- tance, fromanacademic, industrialandsocietalpointofview. Thedroppingcost of WLAN and short-range technologies such as Bluetooth and Zigbee is causing the proliferation of personal devices and appliances equipped with radio int- faces. Together with the gradual deployment of powerful wireless infrastructure networks, such as 3G cellular systems...