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IEEE 802.15.4 ZigBee MAC |
 Specification |
* PHY frequency range
: 868MHz (BPSK/1 Europe), 902~928 MHz(BPSK/10 USA), 2.4GHz (OQPSK/16
Worldwide)
* Data Transmission Speed
: 2.4GHz ? 250Kbps, 915MHz ? 40Kbps, 868Mhz ? 20Kbps
* Network Topology : Star
& Mesh topology, peer to peer
* CSMA-CA : Use network
access method to avoid conflict
* Duty cycle : Less than
0.1%
* Low power : Minimum several
months to several years.
* Multiple topologies :
star, peer-to-peer, mesh
* Large Network : Maximum
255 Nodes, Maximum 65,535 Nodes after adopting 64bit Address
* Short Range Operation
* GTS(Guaranteed Time Slot)
: Support GTS data transmission method to ensure QoS, which is problem
of wireless network |
| 802.15.4
Specification |
 |
| |
2.4 GHz |
868 MHz |
915 MHz |
| Data Rate |
250 Kbps |
20 Kbps |
40 Kbps |
| Channel |
11~26channel |
1 channel |
10 channel |
| DSSS |
32-chipPN codes |
15-chip PN
codes |
| Chip Modulation |
O-QPSK |
BPSK |
| Symbol Rate |
62.5 Ksym/s |
20 Ksym/s |
40 Ksym/s |
| Chip Rate |
2.0 Mchips/s |
300 Kchips/s |
600 Kchips/s |
| Sensitivity |
-85 dBm |
-92 dBm |
|
| RF Linearity |
-10 dBm (IIP3),
-4 dBm (Output P1dB) |
| Transmit Power |
0 dBm (1mW) |
| Adjacent Channel Rejection |
0 dB |
| Alternating Channel Rejection |
30 dB |
|
|
| Channel |
| Total 27 channels in 3 frequency band. |
Number
of Channel |
Channel
based frequency |
k=0 |
868.3 MHz |
k=0,1,2,..,10 |
906 + 2(k-1)MHz |
k=11,12,...26 |
2405 + 5(k-11)MHz |
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| Technology
comparison of wireless network |
[Bluetooth]
Wire cable replacement t, 10m short distance / 4Mbps speed / mobile
communication terminal(ex ;PC& peripheral devices, home appliances)
[UWB]
Maximum 20m short distance, 480Mbps high capacity/camera, camcorder,
digital TV, home entertainment
[ZigBee]
Establishment of large-scale sensor network using low-energy consumption
sender/receiver connected to (activity, light, pressure, temperature,
humidity) |
|
| |
Wireless
PAN |
Wireless
LAN |
| IEEE 802.15.4(ZigBee) |
802.15.1(Bluetooth) |
802.11b(Wi-Fi) |
802.11g |
802.11a |
| Frequency(Hz) |
868M, 915M,2.4G |
2.4G |
2.4G |
2.4G |
5G |
| Modulation |
DSSS |
FHSS |
DSSS/CCK |
OFDM/PBCC |
OFDM |
| MAC |
CSMA/CA |
TDMA |
CSMA/CA |
CSMA/CA |
CSMA/CA |
| Data Speed(bps) |
250K,40K,20K |
1M,723K |
11M |
20M |
54M |
| Transmission Length |
10m~75m |
10m~100m |
60m~90m |
45m~75m |
15~30m |
| Node number |
254 |
8 |
256 |
256 |
256 |
| Channel Band(Hz) |
600K, 2M, 5M |
1M |
22M |
22M |
16.6M |
| Transmission Power(dBm) |
-4~20 |
0~20 |
0 |
17 |
17 |
| Target Unit Price(US$) |
1.5~2.5 |
5 |
- |
- |
- |
|
|
|
|
802.11b(g)
|
Bluetooth |
802.15.4 |
Power Profile |
Several hours |
1week |
More than 1year |
BOM |
$9 |
$6 |
$3 |
Network Protocol |
Relatively complicate |
Very complicate |
simple |
Node adoption |
32 |
7 |
64000 |
| Network initialization |
3 seconds |
10 seconds |
30mS |
Communication length |
100 meter |
10 meter |
100 meter |
Extension |
Roaming available |
Roaming unavailable |
Routing support |
Data Transmission
speed |
11 Mbps(54Mbps) |
1Mbps |
250kbps |
Security |
Authentication service set ID(SSID) |
64-bit, 128-bit |
128-bit AES and
application layer user defined |
|
|
|
| |
802.11a |
802.11b |
802.11g |
UWB |
ZigBee |
Features
|
Frequency Band |
5GHz |
2.4GHz |
2.4GHz |
3-10GHz |
2.4GHz, 868/915MHz |
| Network |
1:N |
1:N |
1:N |
1:N |
Ad-hoc, Star, Mesh |
Application
|
Data Transmission |
O |
O |
O |
O |
O |
| Wireless control |
|
|
|
|
O |
| Entertainment |
O |
O |
O |
O |
|
| Toy |
|
|
|
O |
O |
Remote meter reading/
telemedicine |
|
|
|
|
O |
|
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|
Bluetooth
[802.15.1]
|
ZigBee
[802.15.4]
|
WLAN
[802.11b] |
Standardization |
Completed 802.15.1 |
Completed 802.15.4 |
July , 1999 |
Active frequency band |
2.4GHz |
2.4GHz,868/915MHz |
2.4GHz |
Maximum Speed |
Audio:64kbps, Data:720kb/s |
250kb/s, 40kb/s,20kb/s |
11 Mbps |
Modulation Method |
FHSS |
DSSS/OQPSK |
DSSS/CCk |
| Coverage Length |
<10m, 100m |
<70m |
<100m |
Energy Consumption(hours) |
0.1W
(several hours) |
0.05W
(more than several months) |
1W
(1~2hours) |
Price($) |
$5 |
$2 |
$20 |
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| Beacon
/ Non-beacon Network |
|
| PPDU
( MAC Data frame ) |
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| |
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