1. May 14, 2001
Project: IEEE P 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:[ ], FAX: [ ],
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 10/20kbps data rate in 900MHz]
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
Hans van Leeuwen, STS

2. Outline presentation of a Low Data Rate solution in 900MHz ISM bands
May 14, 2001
Outline presentation of a Low Data Rate solution in 900MHz ISM bands
Hans van Leeuwen, STS

3. Position in the wireless information chain
<month year>
doc.: IEEE <doc#>
May 14, 2001
Position in the wireless information chain
Hans van Leeuwen, STS
<author>, <company>

4. Why 868/928? In a world full of 2.4GHz devices
May 14, 2001
Why 868/928?
In a world full of 2.4GHz devices
it gives potentially much more resistance to interference
and a greater range than 2.4GHz
lower power with same technology.
Hans van Leeuwen, STS

5. Features: UMC very low (under $2 for a transceiver) very robust signal
May 14, 2001
Features:
UMC very low (under $2 for a transceiver)
very robust signal
low susceptibility to interference
reach
interoperability
time-to-market
fits all ISM bands
frequency agility
scalability over and 2400MHz
location awareness: meters
Hans van Leeuwen, STS

6. May 14, 2001
A virtual world band
With a single PHY we cover all allowable 900 MHz and 2400MHz ISM center frequencies,
868, 902, 917MHz
Hans van Leeuwen, STS

7. A world band A manufacturer puts one device on the market May 14, 2001
Hans van Leeuwen, STS

8. Starting design requirements
May 14, 2001
Starting design requirements
868 ETSI, 915 FCC, 2400 ETSI/FCC
low power (power down options)
high interference suppression
transceivers or transmitters
PHY and MAC in a single chip
flexible by register settings
variable packet length (10 Byte as default)
BOM cost: 2001< $4 for trx ,later <$1,50 tx, <$2 txrx
Hans van Leeuwen, STS

9. May 14, 2001
ETSI
or 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
Hans van Leeuwen, STS

10. FCC 902 - 928 Mhz 500KHz RF BW -20 dBc for side lobes
May 14, 2001
FCC
Mhz
500KHz RF BW
-20 dBc for side lobes
process gain > 10dB
100% duty cycle
no specific channel requirement
frequency agility is preferred
Hans van Leeuwen, STS

11. 2400FCC/ETSI 1 - 100 mW 250kbps air data rate 15/31 chips
May 14, 2001
2400FCC/ETSI mW
250kbps air data rate
15/31 chips
sensitivity < -90dBm
below 10mW: SRD specs
100% duty cycle
no specific channel requirement
frequency agility is preferred
CRC & retransmissions
Hans van Leeuwen, STS

12. May 14, 2001
Drivers
LOW COST
get a small data packet across is important, NOT the speed
low power
range
high interference suppression
Hans van Leeuwen, STS

13. 4 major design issues of low data rate DSSS
May 14, 2001
4 major design issues of low data rate DSSS
fast acquisition
large frequency inaccuracy
strong interferers
low current consumption
Hans van Leeuwen, STS

14. May 14, 2001
Hans van Leeuwen, STS

15. Thin MAC May 14, 2001 Hans van Leeuwen, STS MAC + Application FIFO
Frame building (PLCP)
PHY interface
MLME
Rx_Signal
Tx_Signal
MAC + Application
Actuator
Sensor
Hans van Leeuwen, STS

16. May 14, 2001
Air Frame
Hans van Leeuwen, STS

17. May 14, 2001
Proposed PHY
868MHz
10/20kbps, 31/15 chips direct sequence spreading
902MHz
10/20kbps, 31/15 chips, 1MHz channels (interference avoidance)
Hans van Leeuwen, STS

18. May 14, 2001
PHY
Hans van Leeuwen, STS

19. Current implementation
May 14, 2001
Current implementation
0 dBm power output
~ -100 dBm sensitivity
10kbps air data rate
31 chips spreading
-20dB interference suppression
sync in ms
1 ~ 2mA average (200ms response time, PHY&MAC, 12ms sync time)
48 pin MLF package
Hans van Leeuwen, STS

20. Protocol choices Rx always on, Sensor shortest Tx on-time:
May 14, 2001
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
Hans van Leeuwen, STS

21. May 14, 2001
Single Chip, 10kbps, DSSS, 900MHz transceiver, thin MAC, CRC, uC interface, RS232
Hans van Leeuwen, STS

22. Time to market current implementation now
May 14, 2001
Time to market
current implementation now
demonstration projects and engineering samples in August
first quantities in Q4 2001
Hans van Leeuwen, STS

23. Manufacturability 0,35 CMOS, 3.75 x 3.75 mm, 48 pin MLF
May 14, 2001
Manufacturability
0,35 CMOS, 3.75 x 3.75 mm, 48 pin MLF
1/2” PCB with very few external components
easy to design in by digital engineers
low cost X-tal
wide low cost SAW filter (optional, but advisable)
low cost uC
Hans van Leeuwen, STS

24. May 14, 2001
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
Hans van Leeuwen, STS