Transcript 01130r1P802-15_TG4-AMI-STS-MAC-PHY-proposal.ppt

March 13, 2001
doc.: IEEE 802.15-01/130r1
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Outline presentation of Low Data Rate CMOS solution]
Date Submitted: [March 13, 2001]
Source: [Hans van Leeuwen] Company [STS Smart Telecom Solutions B.V.]
Address [Zekeringstraat 40, 1014 BT, AMSTERDAM, The Netherlands]
Voice:[+31 20 420 4200], FAX: [+31 20 420 9652], E-Mail:[[email protected]]
Re: [Presentation of a low data rate transceiver proposal]
Abstract: [Presentation of a low data rate transceiver PHY and thin MAC proposal; proven,
manufacturable, low data rate DSSS solution for use in European and US license exempt bands]
Purpose: [General information for selection process, discussion about 10kbps data rate use and
introduction to a demonstration in July]
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.
Submission
Slide 1
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Outline presentation of a Low Data
Rate solution
a low data rate transceiver PHY and thin MAC
proposal; proven, manufacturable, low data
rate DSSS solution for use in European and
US license exempt bands
Submission
Slide 2
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Position in the wireless information
chain
Submission
Slide 3
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Conformance issues (Ch 2)
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UMC very low
signal robustness
interference & susceptability
coexistence
interoperability
manufacturability
time-to-market
regulatory impact, fitting to ISM bands
maturity
scalability
location awareness: meters
Submission
Slide 4
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Conformance issues (Ch 2)
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UMC very low
signal robustness
interference & susceptability
coexistence
interoperability
manufacturability
time-to-market
regulatory impact, fitting to ISM bands
maturity
scalability
location awareness: meters
Submission
Slide 5
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Conformance issues (Ch 3, MAC)
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transparent upper layer protocols
ease of use
delivered data throughput
data types (bursty data)
topologies (M-S, P-P, …)
max active connections
adhoc network
portal
realiability
power management types (sleep, user , rx, tx)
security
Submission
Slide 6
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Conformance issues (Ch 3, MAC)
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transparent upper layer protocols
ease of use
delivered data throughput
data types (bursty data)
topologies (M-S, P-P, …)
max active connections
adhoc network
portal
realiability
power management types (sleep, user , rx, tx)
security
Submission
Slide 7
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Conformance issues (Ch 4, PHY)
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size & form factor
frequency band
simultaneous operating systems
signal acquisition method
range (power output & sensitivity)
PER/BER
multipath immunity
power consumption
Submission
Slide 8
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Conformance issues (Ch 4, PHY)
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size & form factor
frequency band
simultaneous operating systems
signal acquisition method
range (power output & sensitivity)
PER/BER
multipath immunity
power consumption
Submission
Slide 9
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Starting design requirements
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868 ETSI, 915 FCC, (2400 ETSI/FCC)
low power (power down options)
high interference supression
transceivers or transmitters
easy adaptive to application by non RF engineer
PHY and MAC (partly) in a single chip
flexible by register settings
• variable packet length (10 Byte as default)
• low BOM cost: 2001 $5 for trx ,later 2$ tx, 3$ txrx
Submission
Slide 10
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
ETSI
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868.0 -868.6 or 868.7 - 869.2 Mhz
2 available DSSS channels (bands): 600, 500Khz
spurious -36dBm outside the bands
-57dBm at FM, TV and Telecom frequencies
max power output 25mW
1% or 0,1% duty cycle
Submission
Slide 11
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
FCC
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902 - 928 Mhz
500KHz RF BW
-20 dBc for side lobes
process gain > 10dB
power output below 6mW: easy approval
100% duty cycle
no specific channel requirement
frequency agility is preferred
Submission
Slide 12
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
ETSI/FCC/..
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2400 - 2483MHz
< 10mW
no spreading, no data rate requirements
above 10mW: > 250kbps aggregate bitrate, 10dB
process gain
Submission
Slide 13
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Drivers
• LOW COST
• get a small data packet across is important, NOT the
speed
• low power
• range
• high interference suppression
Submission
Slide 14
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
4 major design issues of low data
rate DSSS
fast acquisition
large frequency inaccuracy
strong interferers
low current consumption
Code Position
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Frequency
Submission
Slide 15
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Thin MAC
PduInd stands for Protocol Data Unit Indicate.
PduReq stands for the Request.
Sensor
Actuator
Physical Layer Convergence Protocol (PLCP) – Preambles, control
headers, data whitening.
Physical Media Dependent (PMD) – Where it actually writes to the hardware.
Media Access Control (MAC) – Segmentation, fragmentation, creates
units and controls access to
MAC +data
Application
the medium based on its rules.
Mac Layer Management Entity (MLME) – Control interface between the application and the MAC and
PHY.
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FIFO
MLME
Frame building (PLCP)
PHY interface
Tx_Signal
Submission
Rx_Signal
Slide 16
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Air Frame
AIR Frame format for PAR_IO mode
> 2 ms
Preamble
1.2 ms
Free
Sync
Data field
1.6 ms
0.8 ms
EOF
CRC
Elaborated example of AIR Frame format
for PAR_IO mode
> 2 ms
Preamble
Submission
1.2 ms
Data_Sync
Code
Free
Data
800us
800us
Data_ext
code
Data_ext
code
Slide 17
Free
Data
800us
800us
800us
Data_ext
code
Data_EOF
code
CRC
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Proposed PHY
• 868MHz
– 10/20kbps, 31/15 chips direct sequence spreading
• 902MHz
– 10/20kbps, 31/15 chips, 1MHz channels (interference
avoidance)
• 2400MHz
– 10/20kbps, 31/15 chips, 1MHz channels
Submission
Slide 18
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
PHY
Source Encode/Decode – packet formation including headers, data interleaving, error detection (CRC).
Channel encode/decode – bias suppression, symbol spreading/de-spreading.
Encrypt/De-crypt – not used
Modulate/Demodulate – convert digital data to analog format. Includes symbol filtering (data shaping),
frequency conversion, frequency filtering.
 Frequency Spreading/De-spreading – not used
Tx_Signal
Rx_Signal
Transmit/Receive – transition the signal to/from the channel.
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Source
Encode
Source
Decode
Encrypt
Decrypt
Channel
Encode
Channel
Decode
Modulate
Demodulate
Frequency
Spreading
Frequency
Despreading
Transmit
Receive
Channel
Submission
Slide 19
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Example 1, RKE
• automotive requirement
• 10ms sync time for frequency and code
synchronization
• 10ms data transmission (100bit rolling code @
10kbps)
• 15/200ms duty cycle receiver (immediate response)
• includes full sync-detection cycle
• on-time transmitter 200ms
• receiver average current consumption ~1mA
Submission
Slide 20
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
20 40 60
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20
Submission
0
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Slide 21
60
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Example 2, Skate Watch
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Even less power consumption
2s duty cycle receiver
less parameter freedom: freq & code position known
synchronised tx & rx
2 ms pre-amble on: sync time
3.2ms data transmission (32bit @ 10kbps)
on-time transmitter <10ms
Submission
Slide 22
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Example 3, AMR
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Long range
5s duty cycle measurement
download data to gateway on demand
beacon
2 ms pre-amble on: sync time
3.2ms data transmission (32bit @ 10kbps)
on-time transmitter 20ms
Submission
Slide 23
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Discuss:
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AMR part of 802.15.4?
mobile receiver (master)
battery powered system
data throughput is not important, but getting the
message across is
• TCP/IP in the sensor/slave?
• can this be done otherwise?
Submission
Slide 24
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Current implementation
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0 dBm power output
~ -100 dBm sensitivity
10kbps air data rate
31 chips spreading
-20dB interference suppression
sync in 2 - 12 ms
1 ~ 2mA average (200ms response time, PHY&MAC,
12ms sync time)
• 44 pin MLT package
Submission
Slide 25
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Protocol choices
• Rx always on, Sensor shortest Tx on-time:
• 20 ms pre amble
• monitoring, alarm etc
• Rx duty cycling, Tx uses longer pre-amble:
• 200 ms
• battery master, switch, RKE
• Master Beacon, slave Rx duty cycling,
network keeps synchronised:
• 2 ms
• networks
Submission
Slide 26
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Single Chip, 10kbps, DSSS, 900MHz transceiver,
thin MAC, CRC, uC interface, RS232
8 bit micro
controller
ADC
power
manager
control
PLL
Parallel Interface
RX
Digital
Signal
Processor
RX Data
Interface
Timer
TX
transmitter
TX Data
Interface
Serial
Com
SSTAR-01
Submission
Slide 27
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Measured spectrum
ETSI compliancy demonstrated
Submission
Slide 28
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Time to market
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current implementation now
engineering samples in May
demonstration projects from June
first quantities in 2001
Submission
Slide 29
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Manufacturability
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0,35 CMOS, 44pin MLT (7x7 mm)
1/2” PCB with very few external components
easy to design in by digital engineers
low cost X-tal
wide SAW filter (optional, but advisable)
low cost uC
Submission
Slide 30
Hans van Leeuwen, STS
March 13, 2001
doc.: IEEE 802.15-01/130r1
Conclusions
• the thin layer MAC allows to bolt on any extended
protocol (standard ……)
• scalable PHY
• manufacturable, at low cost and ready for market in
2001
Submission
Slide 31
Hans van Leeuwen, STS