What are the trends – wireless networks like other networks are becoming faster. Before they have been used in niche markets because of there speed and price, speed is becoming faster and price is coming down allowing them to be in general use.
Wide area wireless is coming and outside the US is there. However, it is still sometime before always connected WWAN networks will be there. The early GPRS networks will be half duplex and their send bandwidth will not fast
Wireless LANs have been around for a few years but have been limited in speed. The standardization of IEEE 802.11b has started the takeoff of wireless LANs, though there are still a number of issues to work out.
IrDA has been around from 1994 and exists on every laptop sold today. It has not had a widespread success, one of the reasons being the difficultly of getting the line of sight setup for easy use. Bluetooth 1.0 was standardized last year and lots of companies are working on products so we expect it to start taking off this year.
Lots of personal devices each containing some information, want to be able to link them together The t ype of apps that will be required to do this are: Device interconnect Cable replacement Information exchange File transfer Business cards Location applications Printer nearby Directions to room Voice over IP
There should be no configuration that needs to be entered per location, preferably no configuration at all. CDPD requires an NEI to be entered, a security key is not required because the key is set the first time the NEI is accessed. Providers give you a time limit to limit security issues 802.11 requires network name and security keys per locations, we will talk about this later BT requires a security PIN per device not per location, this has a different set of problems which we will talk about later.
IrDA supports the following applications
Bluetooth supports the following applications which is a subset of the IrDA applications
Bluetooth™ Wireless System Joe Decuir Microsoft Chair, Seattle COM-19 [email_address] Note: Bluetooth™ is a trademark of Ericsson
Application Framework and Support Link Manager and L2CAP Radio & Baseband Host Controller Interface Latest Version on Bluetooth Website: www.Bluetooth.com RF Baseband Audio Link Manager LMP L2CAP TCP/IP HID RFCOMM Applications Data Control
Inquiry Page Connected AMA Transmit data AMA T typical=0.6s T typical=2s HOLD AMA PARK PMA T typical=2 ms Releases AMA Address Low Power States Active States Standby Connecting States Unconnected Standby Disconnect SNIFF AMA T typical=2 ms T typical=2 ms