Smart Phone and Next Generation Mobile Computing

Introduction to Smart Phone and Mobile Computing 15

data using an on-board antenna. The RF data transmission does not

require line of sight. Passive RFID tags do not require batteries for data

transmission, whereas active RFID tags with more complex circuits

do requires batteries to operate. In a typical application scenario, an

RF reader is able to collect data from many RFID tags wirelessly and

even update data on those RF tags. This makes the RFID technology

extremely compelling for asset and people tracking, inventory mon-

itoring, access control and ticketing, etc. As a sign of the ultimate

widespread use of RFID tags, Wal-Mart asked its top 100 suppliers to

initiate use of RFID tags on cases and pallets of consumer goods by

January 2005. Most