Transcript PHY/MAC Proposals for 1451.5> Xuhui Hu, Taekyoung Kwon > Slide 1 Criteria Considered • User level requirements • MAC level requirements • PHY level requirements Slide.

<Decision Criteria to Choose
PHY/MAC Proposals for 1451.5>
<Myung Lee, Yong Liu, Chunhui Zhu,
Xuhui Hu, Taekyoung Kwon >
<CUNY/Samsung>
<tel: 212-650-7260>
<fax: 212-650-8249>
<[email protected]>
Slide 1
Criteria Considered
• User level requirements
• MAC level requirements
• PHY level requirements
Slide 2
User Level
Battery
life
802.15.4
802.11b
Bluetooth
(802.15.1)
Long
Short
Moderate
$12-15
Cost
$5
$20-25
Intended cost
<<$10/chip,
including radio,
processor and stack,
excluding the
antenna
(Jens Hult
@oceanasensor)
Slide 3
Axonn
Transmit-only: longer then 2-way
10 year at 3 minute interval
Parts cost 4$,
Cost includes:
20 dBm output
Sleep timer Xtal, RF Xtal, Antenna, EEROM
CPU W/ application interface, I/O interface
DC-DC converter for single battery operation
Measures bat life under load, Watch dog
Magnetic loop programming
User Level (cont.)
Xmission
range
802.15.4
802.11b
Indoor:
10m @ 250 Kbps; +0 dBm
TX
Indoor:
39m@11Mb/s,
107m@1Mb/s; +20dBm,
2.2dBi diversity ant.
Outdoor:
30m typ, up to 75m @+0
dBm, 300m @+20 dBm
Data Rate
250kb/s @2.4GHz,
40kb/s @915MHz,
20kb/s @868MHz
Outdoor:
244m@11Mbps,
610m@1Mbps; +20dBm,
2.2dBi diversity
1, 2, 5.5, 11Mbps
Slide 4
Bluetooth
(802.15.1)
Indoor:
10m @ 720kbps;
+0 dBm TX
Outdoor:
30m
Axonn
Indoor:
100m @19.4 KB/s (20
dBm)
Outdoor:
2400 m
100m using class 1 radio
(Jens Hult)
1 Mbps
19.4 Kb/s,
58.2 Kb/s,
116 Kb/s
User Level (cont.)
802.15.4
802.11b
Data Latency*
(ms)
15.36•2^N
[N=0,1..14]
Beacon Interval
1.024•N
[N=1,2…2^16 -1 ]
Beacon Interval
Security
MAC level security
MAC level
security
Message
length
Up to 113 bytes
Up to 2304 bytes
Bluetooth
0.625
MAC level
security
Up to 343
bytes
Axonn
10 Ms on short message
(Latency must at least equal
message length if the CRC is
checked, also suggest publish
the time instead of
“short/long”)
MAC level
+ SEQ #
Up to263.5 bytes
7 (active)
255 (Parking
mode)
Not specified
4KB for RFD
30KB for FFD
100-200KB
2KB standard
300B for RFD
4KB for FFD
150KB
256 B
Sensors per
access point
65536
Code size
RAM size
Not specified
* Setup time is not considered
Slide 5
MAC Level
802.15.4
CSMA
802.11b
Beacon
DCF
Bluetooth
Axonn
PCF
MAC
Mechanism
CSMA/CA
CSMA/CA+
TDMA in GTS
CSMA/
CA
CSMA/CA+Pol
ling
FHSS+Polling
(TDD)
Standard Aloha with
Abort
(2-way devices support
CSMA, poll-respond,
and Xmit-listen for
ACK)
Association
No
Yes
No
Yes
Yes
Optional
Disassociation
No
Yes
No
Yes
Yes
Optional
Orphaning/
Reassociation
No
Yes
No
Yes
No
Data Reliability
Yes (MAC ACK)
Yes (MAC ACK)
Yes (MAC ACK)
Yes (MAC ACK)
Channel Scan
Yes
Yes
Yes
YES
Frequency
Agility
Yes
Yes
No
Yes
Slide 6
MAC Level (cont.)
802.15.4
802.11b
CSMA Beacon CSMA PCF
Bluetooth
Axonn
Yes
Sleeping Mode
No
Yes
No
Yes
Yes
Reserved
Channel
No
Yes
No
Yes
Yes
Link Quality
Indication
Synchronization*
Yes
No
Yes
Yes
No
* TDMA mode
Slide 7
Yes
Yes
Yes
Yes
PHY Level
802.15.4
802.11b
Bluetooth
Axonn
In-band PG 18 dB
Fading margin required for
specified BER: 10 dB (900 Mhz)
Provides impulse noise rejection
Xmit-only devises reject local
noise (2-way devices can be
jammed)
Superior range provides
overlapping receiver coverage
In-band PG:
10 dB
In-band PG:
10 dB
Fading margin
required for
specified BER:
33 dB
Fading Margin
for specified
BER :33 dB
Min. RX Sensitivity
(dBm)
2.4 GHz PHY:-85 dBm
868/915 MHz: -92 dBm
(adding a 20 dBm LNA
will significantly reduce
jam margin)
-80 dBm
-70 dBm
-110 dBm at 19.2 Kbps
Min. adjacent channel
rejections (dB)
2.4 GHz / 915 MHz: 0 dB;
868 MHz: N/A
>35 dB
0
65 dB to 90 dB@ 3 MHz
In-band PG: 13 dB
Data Reliability
Fading margin req for
specified BER:
@ 900 MHz: 24 dB
@ 2.4 GHz: 33 dB
Slide 8
PHY Level (cont.)
Max. Frequency
tolerance (± ppm)
802.15.4
802.11b
Bluetooth
Axonn
± 40 ppm
± 25 ppm
± 30 ppm
40 PPM
68 bits (68  s)
92 bits (4740  s)
Also provides:
Antenna diversity
Impulse noise reject
Freq channel search
Correlation peak optimization
Xtal frequency error removal
220μs
Instant: Xmit –only system
RX Synch. Preamble
(s)
32 bits
(868 MHz: 1600μs;
915 MHz: 800μs;
2.4 GHz: 128μs)
RXTX turnaround
time (s)
12 symbol
(868MHz: 600  s;
915MHz 300  s;
2.4 GHz:192  s)
128 bits (144  s)
5μs, 10μs
Slide 9
PHY Level (cont.)
802.15.4
802.11b
Bluetooth
Axonn
Power
consumption
60mW active (@0dBm);
5, 60, 2000μW sleep
1.5W active,
45 mW sleep
75mW active,
60 w sleep
500 mW Active
(@20dBm out),
15 uW sleep
Frequencies
868-868.6 MHz
902-928 MHz;
2.4-2.4835 GHz;
2.4-2.4835 GHz
2.4-2.4835 GHz
902 MHz ~ 928
MHz
2.4 – 2.48 GHz
RF Channels
2.4GHz PHY: 16
channels; 915 MHz
PHY: 10 channels
868 MHz PHY: 1
channels
FHSS: 79 channels
DSSS: 11 channels
FHSS: 79
channels
Spread
Spectrum
direct sequence
FHSS/DSSS
FHSS
Direct Sequence +
freq agile
Error Detection
16 bit CRC
32 bit CRC (frames),
16 bit CRC (headers)
16bit CRC, 1/3 and
2/3 FEC
16 or 32 bit CRC +
1 bit ECC
Slide 10
8 (each spaced 3
MHz apart)
PHY Level (cont.)
802.15.4
802.11b
Bluetooth
Axonn
Chip Rate
868 MHz : 300 Kc/s;
915 MHz : 600 Kc/s;
2.4 GHz : 2.0 Mc/s
11Mc/s
1Mc/s
1.22 Mc/s
Carrier Modulation
868/915MHz; BPSK;
2.4 GHz:O-QPSK
FHSS: GFSK
DSSS:
DBPSK/DQPSK
GFSK
OOK/BPSK
Bit Error Rate
@10^-4
~SNR 0.2 dB (2.4
GHz)
~SNR 1.0, 4.5, 3.5,
7.0 dB { @ 1, 2, 5.5,
11 Mb/s}
SNR 12.5 dB
1X10-3
Wireless
networking
standard (if used)
ZigBee
WiFi
Bluetooth
SIG
no
Transmit Only
nodes
No
No
No
Yes
1000 mW
Regulatory Limit
FHSS: 100 mW
DSSS: 1000 mW
Regulatory Limit
100mW
Regulatory Limit
100 mW Typ,
1 W FCC limit
Max TX Power
(mW)
Slide 11
Sources
•
•
•
•
•
•
•
•
IEEE Std 802.11-1999
IEEE Draft P802.15.4/D18, February-2003
Specification of the Bluetooth System, vol. 1, December-1999
Axonn, “AUTOMATION SERIAL PROTOCOL (RF System Level
Requirements)”, Document# P1451.5-Prop3, Document# P1451.5Prop3A, March, 2003
“Direct input” from Britton Sanderford at Axonn, June 2003
Junko Yoshida, “ Specs near Completion for ZigBee Wireless Scheme,”
EE Times, August 2002
Kenneth D. Cornett, “A Proposal for the IEEE 1451.5 Wireless Smart
Sensor Standard”, Document# P1451.5-Prop2, March, 2003
Michael R. Moore and Stephen F. Smith, Kang Lee, “The Next Step —
Wireless IEEE 1451 Smart Sensor Networks”, Sensors Magazine,
SEPTEMBER 2001
Slide 12