April, 2010 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: Information relating to default channel frequency selection for 802.15.4f 2.4GHz PHY Date Submitted: 22nd April 2010 Source: Andy Ward, Ubisense Address: St Andrew’s House, St Andrew’s Road, Chesterton, Cambridge, CB4 1DL, ENGLAND Voice: +44 1223 535170, FAX: +44 1223 535167, E-Mail: andy.ward@ubisense.net Abstract: Information to support selection of default frequency channels for 802.15.4f 2.4GHz PHY Purpose: To be considered by 802.15TG4f Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15. Andy Ward, Ubisense

April, 2010 Information relating to default channel frequency selection for 802.15.4f 2.4GHz PHY Andy Ward Ubisense Andy Ward, Ubisense

doc.: IEEE 802.15-<doc#> <month year> doc.: IEEE 802.15-<doc#> April, 2010 Overview Frequencies used by the 802.15.4f 2.4GHz PHY should avoid existing systems in that spectrum Since existing spectrum use will vary from site-to-site, it is proposed that a modifiable channel table is used by 802.15.4f devices However, it would be useful to have a small number (four is proposed) of ‘default’ channels which cannot be modified This simplifies communications with a device when the current contents of the modifiable channel table are not known This document presents some information on existing use of the 2.4GHz spectrum which should assist in selecting the default channels Andy Ward, Ubisense <author>, <company>

Typical use of 2.4GHz at US site April, 2010 Typical use of 2.4GHz at US site ZIGBEE Channel 15 2425MHz Channel 20 2450MHz Channel 25 2475MHz 2483.5 f/MHz 2400 Channel 26 2480MHz WiFi Channel 1 2412MHz Channel 6 2437MHz Channel 11 2462MHz 2483.5 f/MHz 2400 Aggregate 2483.5 f/MHz 2400 Andy Ward, Ubisense

Typical use of WiFi at EU site April, 2010 Typical use of WiFi at EU site Existing use 1 5 9 13 Channel 1 2412MHz Channel 5 2432MHz Channel 9 2452MHz Channel 13 2472MHz 2483.5 f/MHz 2400 Andy Ward, Ubisense

Where should we try and fit ourselves? April, 2010 Where should we try and fit ourselves? EU WiFi 2483.5 2400 US WiFi + Zigbee f/MHz 2483.5 f/MHz 2400 These two spots are probably OK across the globe, because of the fixed position of WiFi channel 1 Up this end of the spectrum, you probably can’t choose frequencies that are good for both territories Andy Ward, Ubisense