1. May, 2010
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: Information relating to default channel frequency selection for f 2.4GHz PHY
Date Submitted: 17th May 2010
Source: Andy Ward, Ubisense
Address: St Andrew’s House, St Andrew’s Road, Chesterton, Cambridge, CB4 1DL, ENGLAND
Voice: , FAX: ,
Abstract: Information to support selection of default frequency channels for f 2.4GHz PHY
Purpose: To be considered by TG4f
Notice: This document has been prepared to assist the IEEE P 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 P
Andy Ward, Ubisense

2. May, 2010
Information relating to default channel frequency selection for f 2.4GHz PHY
Andy Ward
Ubisense
Andy Ward, Ubisense

3. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
May, 2010
Overview
Frequencies used by the f 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 f 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>

4. Typical use of 2.4GHz at US site
May, 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

5. Typical use of WiFi at EU site
May, 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

6. Typical use of WiFi in Asia
<month year>
doc.: IEEE <doc#>
May, 2010
Typical use of WiFi in Asia
Depends on the country
China: Can use channels 1-13
Korea: Can use channels 1-13
Singapore: Can use channels 1-13
Taiwan: Can use channels 1-11
Japan: Can use channels 1-13, PLUS channel 14 for b (not g)
Summary: Very similar to US (Taiwan) or EU (everywhere else)
Andy Ward, Ubisense
<author>, <company>

7. Where should we try and fit ourselves?
May, 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, but it might be a good idea to have a couple of default channels up here
Andy Ward, Ubisense

8. Suggested default 2.4GHz channels
<month year>
doc.: IEEE <doc#>
May, 2010
Suggested default 2.4GHz channels
2422.5MHz Suitable for US + EU
MHz Suitable for US + EU
2442MHz Suitable for EU
2447.5MHz Suitable for US
2462MHz Suitable for EU
MHz Suitable for US
NB: Above frequencies are designed to ‘miss’ WiFi frequencies, but they also do a good job of missing /Zigbee frequencies
Andy Ward, Ubisense
<author>, <company>