1. February 19
May 2009
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: GFSK PHY proposal for Smart Utility Networks
Date Submitted: May 11, 2009
Source: Henk de Ruijter, Ping Xiong and Péter Onódy Silicon Laboratories Inc.
Contact: Henk de Ruijter, Silicon Laboratories Inc.
Voice: ,
Re: TG4g Call for proposals
Abstract: PHY proposal towards TG4g
Purpose: PHY proposal for the TG4g PHY amendment
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
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2. Overview Main PHY parameters Why GFSK? USA specifics EU specifics
February 19
May 2009
Overview
Main PHY parameters
Why GFSK?
USA specifics
EU specifics
Japan specifics
China specifics
Frequency tolerance
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3. Main PHY parameters Modulation type: GFSK Modulation index: 0.75
February 19
May 2009
Main PHY parameters
Modulation type: GFSK
Modulation index: 0.75
BT factor: 0.5
Data rate: 40 and 100 kbps depending on local regulations (single data rate per region)
Data whitening: PN9 according to d
64 bit preamble supporting Antenna Diversity
16 and 32 bit CRC depending on payload length
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4. February 19
May 2009
Why GFSK?
Lower adjacent channel emission than FSK complying to local regulations
No linear amplifier needed as appose to BPSK/OQPSK
Low complexity in the modem serving low cost endpoints.
Proven technology for FHSS regulations
Proven technology for Meter reading
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5. BT dependence May 2009 February 19 Freq (kHz) Slide 5 Henk de Ruijter
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6. BT dependence (in channel)
February 19
May 2009
BT dependence (in channel)
Freq (kHz)
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7. Data whitening and Modulation
May 2009
Data whitening and Modulation
Same as 15.4d[5] :
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8. Data whitening same as 15.4d[5]
May 2009
Data whitening same as 15.4d[5]
Seed = “ ”
For details see [5]
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9. PHY Packet 64 bit preamble to support Antenna Diversity = 16 x Ah
May 2009
PHY Packet
Preamble 64 bit
SFD bit
PHR /16 bit
PSDU
max: octets
64 bit preamble to support Antenna Diversity = 16 x Ah
16 bit SFD to reduce false synchronization = 2DD4h
PHR = 8 or 16 bit to support long payloads
LSB of PHR controls PHR length: “0” = 8bit length, “1” = 16bit length
CRC = 32 bits to support long payloads
LSB of PHR controls CRC type: “0” = CRC16, “1” = CRC32
When channel hopping is used: one PHY Packet per hop (slow channel hopping).
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10. CRC CRC depends on PSDU length Derived from Frame Length field (PHR)
February 19
May 2009
CRC
CRC depends on PSDU length
Derived from Frame Length field (PHR)
16 bits CRC up to 127 Octets ( )
32 bits CRC for more than 127 Octets (max: Octets)
Supporting long packets
CRC16 (ITU-T) = b
CRC32 (IEEE section1) polynomial:
x32+x26+x23+x22+x16+x12+x11+x10+x8+x7+x5+x4+x2+x+1
Seed: FFFFFFFF
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11. PSD at 100kbps BW20dB = 112 kHz May 2009 February 19 Slide 11
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12. PSD at 40kbps BW20dB = 44.8 kHz May 2009 February 19 Slide 12
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13. Per Region: May 2009 Region Band [MHz] Pmax [dBm] Rb [kbps]
February 19
May 2009
Per Region:
Region
Band
[MHz]
Pmax
[dBm] Rb
[kbps]
Channel spacing [kHz]
Lowest freq
[kHz]
Highest freq [kHz]
Total # of channels
FHSS/AFA
USA
FCC part 15 [4] 30
100
300
902,300
927,500 85
slow channel hopping
Europe
ETSI EN [2] 14 40
863,300
869,000 52
Japan
ARIB STD T96 [3]
0 & 10
400
955,500 11
AFA
China [6] 17
470,400
509,600 99
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14. Adjacent Channel Power
February 19
May 2009
Adjacent Channel Power
Region
Rb [kHz]
Channel Spacing [kHz]
ACP
(Bw = 2Rb) [dBc]
USA
100
300
-76
Europe 40
-55
Japan China
400
-110
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15. February 19
May 2009
FCC part [4]
For frequency hopping systems operating in the MHz band: if the 20 dB bandwidth of the hopping channel is less than 250 kHz, the system shall use at least 50 hopping frequencies and the average time of occupancy on any frequency shall not be greater than 0.4 seconds within a 20 second period;
Max peak conducted output power for frequency hopping systems operating in the MHz band is 1 Watt for systems employing at least 50 hopping channels.
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16. EU 868MHz Band (non-specific SRD)[1,2]
May 2009
EU 868MHz Band (non-specific SRD)[1,2]
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17. Constrains FHSS in “g” Band
February 19
May 2009
Constrains FHSS in “g” Band
Sub-bands for alarms are excluded:
Max channel spacing = 100kHz
Minimum number of channels = 47
Maximum emission at sub-band edges is -36dBm in 100kHz
Max duty cycle = 0.1% (maybe higher when LBT is used)
NOTE: The duty cycle applies to the entire transmission (not at each hopping channel).
Max dwell time per channel = 400 ms
The maximum return time to a hopping channel shall be equal or less than the product of 4 x dwell and the number of hopping channels and must not exceed 20 s.
Each channel of the hopping sequence shall be occupied at least once during a period not exceeding the product of 4 x dwell time and the number of hopping channels.
In case of LBT being used for FHSS, this function shall be used at each hop channel.
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18. February 19
May 2009
Channel plan for EU:
ch1
863.3
ch14
864.6
ch27
865.9
ch40
867.2
868.5
ch2
863.4
ch15
864.7
ch28
866.0
ch41
867.3
868.6
ch3
863.5
ch16
864.8
ch29
866.1
ch42
867.4
868.7
ch4
863.6
ch17
864.9
ch30
866.2
ch43
867.5
868.8
ch5
863.7
ch18
865.0
ch31
866.3
ch44
867.6
868.9
ch6
863.8
ch19
865.1
ch32
866.4
ch45
867.7
ch52
869.0
ch7
863.9
ch20
865.2
ch33
866.5
ch46
867.8
869.1
ch8
864.0
ch21
865.3
ch34
866.6
ch47
867.9
869.2
ch9
864.1
ch22
865.4
ch35
866.7
ch48
868.0
869.3
ch10
864.2
ch23
865.5
ch36
866.8
ch49
868.1
869.4
ch11
864.3
ch24
865.6
ch37
866.9
ch50
868.2
869.5
ch12
864.4
ch25
865.7
ch38
867.0
ch51
868.3
869.6
ch13
864.5
ch26
865.8
ch39
867.1
868.4
869.7
Note: Sub-bands for Alarm are excluded (gray frequencies)
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19. February 19
May 2009
China ( MHz)[6]:
When TX on time is no more than 5 sec then this band can be used for civilian meter reading.
ERP max = 50mW
Max frequency tolerance 100ppm
Spurious limit: -54dBm in +/-2.5 CHBW
- Needs confirmation
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20. References [1] ERC/REC 70-03 - Version of February 28, 2009
May 2009
References
[1] ERC/REC Version of February 28, 2009
[2] ETSI V2.2.1 ( )
[3] ARIB STD T96 - v1.0 June 6, 2008
[4] FCC Part 15 - July 10, 2008
[5] IEEE Std d™-2009 (April 17, 2009)
[6] Chinese technical requirements for low power (short distance) radio equipment (July 26, 2007)
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