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 Other
wireless communication |
Before Bluetoothhas
been in the center of wireless communication, development of wireless
communication had been continued.
IrDA(Infrared
Data Association), PIAFS(PHS
Internet Access Forum Standard), SWAP(Shared
Wireless Access Protocol), Wireless
LAN (IEEE802.11b)are local area wireless
communication methods.
IrDA IrDA had been put
to practical use in early 1990s and is used in many areas at the
present time, but it has limitation to use as it supports only 1:1
communication and it can fail data transfer by minute angle gap
caused by character of Infrared.
PIAFS is the standard that use
PHS which defined by PHS internet access forum in Japan in 1996,
wireless modem(TA) is connected to phone line and PC can connect
internet with wireless communication, but it is used a few part
in Japan.
In case of SWAP(HomeRF)),
it has not been put to practical use and Wireless LAN substitute
LAN cable to wireless communication between PC. This supports high
rate date transfer from multiple devices simultaneously, mainly
used in office as substitution technology against wired LAN and
PC card type was developed.
Although there are many wireless solutions, the reasons why Bluetooth
is expected as a real technology of wireless networking revolution
are, firstly, that current released Bluetooth specification provides
remarkable communication speed and more concurrent connection devices
than above technologies and secondly short term mass production
through Bluetooth embedded mobile terminals can be expected under
current expanding mobile communication market environment. World
mobile communication terminal vendors have announced to adopt Bluetooth
and Ericsson and Nokia which cover 40% of world mobile communication
terminal market have stated definitely to adopt it.
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Wireless communication
technology comparison table |
| |
IrDA |
PIAFS |
Wireless
LAN |
SWAP |
Bluetooth
|
Standard
name |
IrDA |
PIAFS |
IEEE802.11b |
HomeRF |
Bluetooth
Ver1.0b
(IEEE802.15) |
| Major
vendor |
HP,
IBM, TEMIC, Philips |
.
|
Harris,
3Com, Lucent, Symbol |
Microsoft,
intel, IBM, HP, Compaq |
Ericsson,
Nokia, Intel, IBM, Toshiba, Microsoft |
| Data
rate |
4,16Mbps |
Max
64kbps/sec |
Max 11Mbps/sec |
1~2Mbps |
Max
723kbps/sec |
| Range |
About
30m |
100m |
standard
50m |
50m |
standard
10m |
| Number
of connection |
1 :
1 connection |
1
: 1 connection |
1: N
connection
(Up to 128) |
1:
N connection |
1: N
connection
(Up to 7) |
| Connection
configuration |
Depends
on situation |
Needs
pre-configuration |
Needs
pre-configuration |
Needs
pre-configuration |
Needs
pre-configuration but easy |
| Connection
device type |
PC,
and many others |
PC
- AP |
PC
- PC (AP) |
PC
- and other domestic appliances |
Mobile
phone, PC, Camera and others |
| Data
transferred |
Only
data |
Only
data |
Only
data |
Only
data |
Voice
and Data |
| Standardization |
Worldwide
standard |
Local
standard in Japan |
Worldwide
standard |
|
Worldwide
standard |
| Module
price |
0.2~0.3
dollar |
.
|
Not
fixed |
25
dollar(target) |
About10
dollar (year2000) |
| Strength |
Low
price, High data rate |
Relatively
long distance |
Many
products, High data rate |
Support
legacy network(TCP/IP) |
Strong
against direction and obstacles. Low price and power consumption,
good interoperability. |
| Weakness |
Weak
at direction between devices and obstacles. |
Only
in Japan, low data rate. |
High
price, Not support voice. |
High
price, Hard to configure. |
Low
data rate
(being Improved) |
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