March 2009 Khanh Tuan Le Slide 1 doc.: IEEE 802.15-15-09- 0135-01-004g Multi-Regional Sub-GHz PHY for 802.15.4g Project: IEEE P802.15 Working Group for Wireless Personal Area Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Networks (WPANs) Submission Title: [Preliminary Proposal for a Multi-Regional Sub-GHz PHY for 802.15.4g] Date Submitted: [ 01 March, 2009] Source: [Khanh Tuan Le] Company [Texas Instruments] [Per Torstein Roine] Company [Texas Instruments] Address [Gaustadalleen 21, 0349 Oslo, Norway] Voice: [+47 22958535], E-Mail:[[email protected]] Re: [] Abstract: [Preliminary proposal for a multi-regional sub-GHz PHY for 802.15.4g.] Purpose: [Technical proposal. Presented to the 802.15.4g SUN Task Group for consideration.] 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
Transcript
March 2009
Khanh Tuan LeSlide 1
doc.: IEEE 802.15-15-09-0135-01-004g
Multi-Regional Sub-GHz PHY for 802.15.4g
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Preliminary Proposal for a Multi-Regional Sub-GHz PHY for 802.15.4g]Date Submitted: [ 01 March, 2009]Source: [Khanh Tuan Le] Company [Texas Instruments]
Abstract: [Preliminary proposal for a multi-regional sub-GHz PHY for 802.15.4g.]
Purpose: [Technical proposal. Presented to the 802.15.4g SUN Task Group for consideration.]
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.
March 2009
Khanh Tuan LeSlide 2
doc.: IEEE 802.15-15-09-0135-01-004g
Multi-Regional Sub-GHz PHY for 802.15.4g
Preliminary Proposal for a Multi-Regional Sub-GHz PHY for 802.15.4g
IEEE 802 Plenary Meeting11th March 2009, Vancouver, BC
Khanh Tuan Le
March 2009
Khanh Tuan LeSlide 3
doc.: IEEE 802.15-15-09-0135-01-004g
Multi-Regional Sub-GHz PHY for 802.15.4g
OVERVIEW
• Overall Considerations
• Proposal Summary
• GFSK and Frequency Hopping
• Proposal Details for Europe
• Proposal Details for the US
• Suitability for Other Emerging Frequency Bands
• FEC, Whitening and Packet Format
• Discussion
March 2009
Khanh Tuan LeSlide 4
doc.: IEEE 802.15-15-09-0135-01-004g
Multi-Regional Sub-GHz PHY for 802.15.4g
Overall Considerations (1)
• Focus on user requirements, available frequency spectrum and applicable regulations for US and Europe
• Suitable technology for appropriate frequency bands in other regions, e.g. China and Japan
• Full utilization of allowed maximum output power by regional regulations possible– Long communication range can be supported– Adaptive to application needs
• Reliable networks using relatively simple modulation schemes, e.g. FSK, GFSK, MSK
March 2009
Khanh Tuan LeSlide 5
doc.: IEEE 802.15-15-09-0135-01-004g
Multi-Regional Sub-GHz PHY for 802.15.4g
Overall Considerations (2)
• 2.4 GHz PHY options available (e.g. 802.15.4)• Sub-GHz technology are beneficial in many metering
applications– Power– Range
• Spectral efficiency increasingly more important• Need for higher data rates• Strong drive for standardization• Technology requirements- Power optimized and cost
efficient semiconductor solutions, protocol SW
March 2009
Khanh Tuan LeSlide 6
doc.: IEEE 802.15-15-09-0135-01-004g
Multi-Regional Sub-GHz PHY for 802.15.4g
Proposal Summary
• License exempt bands in the US and Europe• US: 902-928 MHz
– Multiple channels, Frequency Hopping– Max output power: 1W (30 dBm), dynamic power control
• Europe: 863-870 MHz – Multiple channels, Frequency Agility and LBT– Max output power: 500 mW (27 dBm) and 25 mW (14 dBm),
dynamic power control
• Modulation format: 2-GFSK and 4-GFSK• Data rates: 50/100/200/400 kbps• Suitable for appropriate frequency bands in other
• 2-GFSK– 1 bit/symbol– Defined for 802.15.4d (BT=0.5, h=1)
• 4-GFSK– 2 bit/symbol
• GFSK can be efficiently implemented on silicon radios and is widely used today.
March 2009
Khanh Tuan LeSlide 8
doc.: IEEE 802.15-15-09-0135-01-004g
Multi-Regional Sub-GHz PHY for 802.15.4g
Frequency Hopping Spread Spectrum
• Required by regulations for high transmit power levels
• Can be used for co-existence of multiple networks• Can enable high aggregate throughput• Inherent frequency diversity mechanism• Well known and proven technique • Required performance can be effectively achieved by
semiconductor radio devices today
March 2009
Khanh Tuan LeSlide 9
doc.: IEEE 802.15-15-09-0135-01-004g
Multi-Regional Sub-GHz PHY for 802.15.4g
863-870 MHz ISM Band in Europe (1)
Regulations in Europe are continuously being revised.
March 2009
Khanh Tuan LeSlide 10
doc.: IEEE 802.15-15-09-0135-01-004g
Multi-Regional Sub-GHz PHY for 802.15.4g
863-870 MHz ISM Band in Europe (2)
• ETSI 300 220• Modulation and (programmable) data rates:
– 2-GFSK: 50 kbps and 100 kbps*Lower data rates are easy to support.
– 4-GFSK: 200 kbps and 400 kbps
• Frequency band and allowed max output power:– 868.00-868.60 MHz (600 kHz): 25 mW / +14 dBm
– 868.70-869.20 MHz (500 kHz): 25 mW / +14 dBm
– 869.40-869.65 MHz (250 kHz): 500 mW / +27 dBm
• Dynamic power control• Frequency Agility• Flexible trade-off between communication range and data rates
March 2009
Khanh Tuan LeSlide 11
doc.: IEEE 802.15-15-09-0135-01-004g
Multi-Regional Sub-GHz PHY for 802.15.4g
863-870 MHz ISM Band in Europe (3)
Frequency Range
[MHz]
# Channels Channel Spacing
[kHz]
Modulation Data Rate
[kbps]
Max Output Power [dBm]
869.40-869.65
(250 kHz)
1 NA 2-GFSK 50 +27
1 NA 2-GFSK 100 +27
1 NA 4-GFSK 200 +27
868.00-868.60
(600 kHz)
3 200 2-GFSK 50 +14
2 250 2-GFSK 100 +14
1 NA 4-GFSK 200 +14
1 NA 4-GFSK 400 +14
868.70-869.20
(500 kHz)
2 200 2-GFSK 50 +14
2 250 2-GFSK 100 +14
1 NA 4-GFSK 200 +14
1 NA 4-GFSK 400 +14
March 2009
Khanh Tuan LeSlide 12
doc.: IEEE 802.15-15-09-0135-01-004g
Multi-Regional Sub-GHz PHY for 802.15.4g
863-870 MHz ISM Band in Europe (4)
One possible scheme with single data rate:• Data rate: 100 kbps• Modulation: 2-GFSK• Channel spacing: 250 kHz• Number of channels: 5
– Channel 1: 868.175 MHz, 25 mW / +14 dBm
– Channel 2: 868.425 MHz, 25 mW / +14 dBm
– Channel 3: 868.825 MHz, 25 mW / +14 dBm
– Channel 4: 869.075 MHz, 25 mW / +14 dBm
– Channel 5: 869.525 MHz, 500 mW / +27 dBm
• Frequency Agility
March 2009
Khanh Tuan LeSlide 13
doc.: IEEE 802.15-15-09-0135-01-004g
Multi-Regional Sub-GHz PHY for 802.15.4g
863-870 MHz ISM Band in Europe (5)
25 mW / +14 dBmMax 1% or LBT
25 mW / +14 dBmMax 0.1% or LBT
500 mW / +27 dBmMax 10% or LBT
March 2009
Khanh Tuan LeSlide 14
doc.: IEEE 802.15-15-09-0135-01-004g
Multi-Regional Sub-GHz PHY for 802.15.4g
ISM 902-928 MHz Band in US (1)
• FCC Part 15.247 • Modulation and (programmable) data rates:
– 2-GFSK: 50 kbps and 100 kbps*Lower data rates are easy to support.
– 4-GFSK: 200 kbps and 400 kbps
• Frequency band and allowed max output power:– 902-928 MHz (26 MHz): 1 W / +30 dBm
(500 mW / +27 dBm)
• Dynamic power control• Frequency Hopping (FH)• Flexible trade-off between communication range and data rates
March 2009
Khanh Tuan LeSlide 15
doc.: IEEE 802.15-15-09-0135-01-004g
Multi-Regional Sub-GHz PHY for 802.15.4g
ISM 902-928 MHz Band in US (2)# Channels Channel Spacing
[kHz]
Modulation Data Rate
[kbps]
Max Output Power [dBm]
50 500 2-GFSK 50 +30
50 500 2-GFSK 100 +30
50 500 4-GFSK 200 +30
50 500 4-GFSK 400 +30
• Basic FH scheme can support any of the data rates in the table and facilitate max +30 dBm output power if needed.
• Additional set(s) of (offset) channels could be defined to support multiple networks in the same area
– The offset channels would partly overlap when the highest data rates are used– The main coexistence mechanism would still be the use of different hopping sequences– Although networks share the same frequency range, coexistence is improved by good far-away
selectivity, as the networks have a high probability of large frequency spacing at any given moment in time
– Multipath fading mitigation and coexistence with other networks are maximized utilizing the entire frequency band
March 2009
Khanh Tuan LeSlide 16
doc.: IEEE 802.15-15-09-0135-01-004g
Multi-Regional Sub-GHz PHY for 802.15.4g
Multiple FH Networks
F1,1 F1,2 F1,3
F2,1 F2,2 F2,3
T2 T1T3
T1 T2T3
March 2009
Khanh Tuan LeSlide 17
doc.: IEEE 802.15-15-09-0135-01-004g
Multi-Regional Sub-GHz PHY for 802.15.4g
Other Regions
# Channels Channel Spacing
[kHz]
Modulation Data Rate
[kbps]
Max Output Power [dBm]
N 200 2-GFSK 50 +17
N 200 4-GFSK 75 +17
• Spectrum efficiency is important.• Similar channelization scheme and modulation
formats may be applicable for the appropriate emerging frequency bands in other regions
• Frequency Hopping or Frequency Agility – Japan: ARIB STD T96 950-956 MHz – May not be allocated
for this type of applications?– China: Example in the table below
March 2009
Khanh Tuan LeSlide 18
doc.: IEEE 802.15-15-09-0135-01-004g
Multi-Regional Sub-GHz PHY for 802.15.4g
Dynamic Link Functionality
Idea for consideration:• Same channelization
– Same channel separation– Same center frequencies
• Higher data rate(s) by change in modulation format, e.g. 2-GFSK to 4-GFSK
• Trade-off– Reduced link budget (range)– Shorter transmission time or more data over same time
period
March 2009
Khanh Tuan LeSlide 19
doc.: IEEE 802.15-15-09-0135-01-004g
Multi-Regional Sub-GHz PHY for 802.15.4g
Simple Low Overhead FEC Proposal• As support for very long packets is mandatory, a
simple low-overhead FEC should be considered to improve the packet error rate
• Proposal: (128,120,4) extended Hamming code• SECDED: Corrects single bit, detect double bit errors
– Double bit error detection does not improve PER, but is useful for early receive termination when packet is corrupted
• Can also be viewed/implemented as (127,120,3) BCH, extended by an extra parity bit– Generator polynomials: x7+x3+1 (BCH) and x+1 (extra parity)
• After 15 octets of PHY data, one octet containing parity check bits (PCB) is inserted
March 2009
Khanh Tuan LeSlide 20
doc.: IEEE 802.15-15-09-0135-01-004g
Multi-Regional Sub-GHz PHY for 802.15.4g
Packet FormatS
FD
LEN
GT
H
PREAMBLE PHY PAYLOAD
CT
RL
CR
C
15 PHY octets
PC
B 15 PHY octets
PC
B 15 PHY octets
PC
B
March 2009
Khanh Tuan LeSlide 21
doc.: IEEE 802.15-15-09-0135-01-004g
Multi-Regional Sub-GHz PHY for 802.15.4g
Whitening Proposal
• Whitening is done after FEC octet insertion• Idea:
– Same LFSR polynomial is used for whitening all the time– The whitening LFSR is initialized to an unique value based
on the channel number (and data rate) used for the packet– This would allow retransmissions to use different whitening
for protection from packet data with poor whitening performance
