H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 12/56 (2006.01) H04Q 11/02 (2006.01) H04Q 7/36 (2006.01)
Patent
CA 2355192
A packet data transmission system is used to link a number of remote hand-held data-gathering units such as bar code readers to a central computer which maintains a database management system. Data packets are sent from the remote units by an RF link to intermediate base stations, then sent by the base stations to the central computer by a serial link. A method of selecting a frequency channel for RF window packet data communication is described. The method includes: (a) receiving signals by the base station on other channels different from an initially selected channel and producing a value for each of the other channels indicative of the RF energy level in such channel (i.e. to identify a channel having the lowest RF energy level); (b) producing a value indicative of the transmission error rate in the initial one of the channels and (c) if the transmission error rate exceeds a threshold, sending a message from the base station to each of the remote terminals directing that transmission and reception of data packets between the base station and the remote terminals will change to the identified channel.
Kirby Eades Gale Baker
Symbol Technologies Inc.
LandOfFree
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