March 29, 2006
The Bluetooth Special Interest Group (SIG) has announced an evolution path to over 100Mbps by adopting WiMedia Alliance's version of ultra-wideband (UWB). WiMedia's UWB, also called "wireless USB", is supported by Intel, Microsoft, Sony and Nokia among others.
The UltraWideBand spec split into two incompatible camps, WiMedia's UWB is not compatible with the UWB Forum standard, promoted by Motorola and Freescale, also called "cable-free" USB.
The Bluetooth SIG will work together with WiMedia to optimize the use of UWB in Bluetooth and to obtain needed worldwide regulatory clearances - something they expect to achieve early in 2007.
The final spec and prototype chipsets are expected to be available around Q3 of 2007. Bluetooth+UWB devices should hit the market early in 2008.
Simple devices such as mono headsets for use with phones will likely remain with the current 2.4GHz Bluetooth technology in order to keep costs down. Initial UWB chipsets are likely to add an extra US$10 to US$15 in cost to devices, though they should quickly fall in line with current Bluetooth chipsets that cost a third as much.
The UWB portion of future Bluetooth devices will run on frequencies above 6GHz, unlike the traditional 2.4GHz band used by Bluetooth and WiFi devices today. Future devices will negotiate with each other to determine whether traditional 2.4GHz Bluetooth or the new UWB connections should be used for a given task based on bandwidth needs. The Bluetooth SIG is hopeful that the UWB system will be as energy efficient as current Bluetooth devices when used within a similar 10m range.
The IEEE 802.15.3a working group hoped to unite UWB factions, but threw in the towel earlier this year and disbanded. The IEEE gave up on uniting the two incompatible UWB camps. In the end there was no consensus between the Motorola/Freescale backed Direct-Sequence UWB group and the Intel-led WiMedia Alliance and its newer cousin EWC, which uses the multiband (MB-OFDM) alternative and frequencies in the 5 GHz band (among other differences). That means consumers will be stuck with two incompatible UWB standards -- "Wireless USB" and "Cable-free USB". A classic BetaMax/VHS dilema. Now it looks like WiMedia/Bluetooth will be the defacto standard.
Related DailyWireless articles include; UWB Overview, UWB in the Chips, MultiBand UWB Chip Gets FCC Approval, Wireless USB 1.0, UWB Range Doubles, UWB Organizations Merging?, Alereon Gets UWB Recognition, UWB RF-ID, Wireless USB Comes Home, and Microsoft Joins UWB Battle.


