Packet data communication system

Details Packet data communication system Packet data communication system

H - Electricity

04

J

H04J 1/00 (2006.01) G06F 13/38 (2006.01) G06K 17/00 (2006.01) H04B 7/24 (2006.01) H04L 12/56 (2006.01) H04B 1/713 (2006.01)

Patent

CA 2119335

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 frequency-hopping transmission method is used for the RF link. The remote units and base stations are all synchronized to a repeating pseudo- random sequence of frequencies in a band (902-928 MHz) which allows this type of transmis- sion. The remote hand-held units initiate an exchange using RF transmission to and from the base stations, receiving only during a rigid time window following a transmission from the remote unit. The base stations cannot initiate communication to the remote units, but instead send data to the remote units only as part of the exchange. The reply messages from the base stations to the remotes contain synchronizing information to maintain coherence with the pseudo-random sequence.

Affiliated with

Also associated with

Rating

Packet data communication system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Packet data communication system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Packet data communication system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1416401