1. <month year>
IEEE P xxxx g
July 2009
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Guide to PHY Band Adaptation]
Date Submitted: [July 2009]
Source:
[Cristina Seibert] Company [Silver Spring Networks]
[Britton Sanderford] Company [Sensus]
Address [] Voice []
silverspringnet.com]
Re: []
Abstract: This document provides guidance for mapping the TG4g PHY into other frequency bands, subject to regulatory constraints in the bands.]
Purpose: Informative Document
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
Cristina Seibert, Britton Sanderford
<author>, <company>

2. July 2009
Problem Statement
Provide unified methodology of mapping band parameters to design parameters for TG4g PHY
Future proofing the standard
Future band allocation
Changes in regulations
Flexibility and simplicity
Support options including on channel spacing
Uncluttered specification
Complement regulatory representation work, for example, as laid out in
Representation/storage vs. usage of regulatory info
Solution captured in document # , submitted to mentor and on reflector since June
Cristina Seibert, Britton Sanderford

3. Challenges Radio designs becoming increasingly band agnostic
July 2009
Challenges
Radio designs becoming increasingly band agnostic
Identify and map regulatory parameters of interest:
Maximum transmit power
Out of band emission requirements
Performance/coverage issues:
Maximum transmit power constraints
High frequency bands
Mitigation techniques
High density deployments
Use more directive and/or higher antennas, better receivers
Data rate reduction
Cristina Seibert, Britton Sanderford

4. July 2009
Out of Band Emissions
Guard band = minimum frequency separation from nearest carrier to band edge to enforce carrier + phase noise below power emission limits.
Guard band allocation, as a function of:
emission limit rules
carrier transmit power
phase noise and carrier attenuation profile
transmit filter and PLL design
Refer to guard band as G, emission power limit as Pemission, maximum transmit power of nearest carrier as M(Nnearest), attenuation per unit of frequency as A:
Example in g
Cristina Seibert, Britton Sanderford

5. July 2009
Channel Planning
The channel plan can be expressed with the following equation:
where
Where total channel bandwidth (or spacing) is C, channel index N, the carrier frequency as a function of the channel index is F(N), the start of the frequency band is S, the width of the available band is W, the maximum allowed transmit power on each channel is M(N), the maximum transmit power in the band is P, the allocated guard bands is GL on the low side of the band and GH on the high side of the band.
Cristina Seibert, Britton Sanderford

6. July 2009
Transmit Power
Alternatively or in combination with guard band allocation, the power in the channels near the band edges can be lowered to accommodate out of band emission requirements.
Let us refer to this as PN,lower
The maximum transmit power of a channel is given by:
M(N) = { P if N >> 0 and N << , else PN,lower }
Cristina Seibert, Britton Sanderford

7. July 2009
Non-Contiguous Bands
The above analysis applies to frequency bands where channel planning can take place (for example, where W >> C).
The leveraging of non-contiguous bands, such as white spaces desirable
For non contiguous spectrum, plan each piece of spectrum i individually, and then concatenate over i
Channel plan:
Cristina Seibert, Britton Sanderford

8. 802.11 Regulatory Classes in US
July 2009
Regulatory Classes in US
Reg. class
Channel Starting Freq (GHz)
Channel Spacing (MHz)
Channel set
Transmit Power Limit (mW)
Emission limit set
Behavior limit set 1 5 20
36,40,44,48 40
1,2 2
52,56,60,64
200 3
149,153,157,161
800 …
Cristina Seibert, Britton Sanderford

9. July 2009
Conclusions
Method for PHY adaptation to different bands, regulations, design parameters such as channel spacing
Offer closed form solutions for:
channel plan
maximum transmit power
guard band allocation
Method extends to non contiguous spectrum
Guide complementary to regulatory work in other task/working groups including
Cristina Seibert, Britton Sanderford

10. Present and Likely Future Bands
July 2009
Present and Likely Future Bands
Frequency Band List
314 – 316 MHz
700 MHz
928 – 960 MHz
316 – 433 MHz
780 – TBD MHz
950 – MHz
MHz
863 – 870 MHz
1427 – 1432 MHz
– MHz
896 – 901 MHz
1605 – 1625 MHz
MHz
901 – 902 MHz
2400 – 2483 MHz
470 – 510 MHz
902 – 928 MHz
Cristina Seibert, Britton Sanderford

11. * 1 Byte Provides Sufficient BW Coverage
July 2009
Table Based Channel List Allows Open Form Solution And
Dynamic Shunting Of Hop Channels
Channel Step Size
* 1 Byte Provides Sufficient BW Coverage
@ 6.25 kHz
1.6 MHz
@ 12.5 kHz
3.2 MHz
@ 25 kHz
6.4 MHz
@ 50 kHz
12.8 MHz
@ 100 kHz
25.6 MHz
@ 200 kHz
51 MHz
@ 300 kHz
76.8 MHz
Base Frequency, Any Band: 22 Bits provide 1 kHz res.
Channel Step Size: 13 Bits provide 50 Hz res.
Hop
Frequency Hop Table; Skip A Hop = 00 1
1 Byte; Represents Desired Freq Channel (see Below *) 2
1 Byte 3 4  83
1 Byte; Return to Hop #1 = FF
Cristina Seibert, Britton Sanderford