CA2119335A1 - Packet data communication system - Google Patents
Packet data communication systemInfo
- Publication number
- CA2119335A1 CA2119335A1 CA002119335A CA2119335A CA2119335A1 CA 2119335 A1 CA2119335 A1 CA 2119335A1 CA 002119335 A CA002119335 A CA 002119335A CA 2119335 A CA2119335 A CA 2119335A CA 2119335 A1 CA2119335 A1 CA 2119335A1
- Authority
- CA
- Canada
- Prior art keywords
- base stations
- remote
- units
- link
- transmission
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
- G06K7/10356—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers using a plurality of antennas, e.g. configurations including means to resolve interference between the plurality of antennas
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/7156—Arrangements for sequence synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
- H04L5/1484—Two-way operation using the same type of signal, i.e. duplex using time-sharing operating bytewise
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/40—Network security protocols
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/7156—Arrangements for sequence synchronisation
- H04B2001/71563—Acquisition
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
A packet data transmission system is used to link a number of remote hand-he ld 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 a n 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 pseud o- 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 synchronizi ng information to maintain coherence with the pseudo-random sequence.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/044,648 US5528621A (en) | 1989-06-29 | 1993-04-08 | Packet data communication system |
US044,648 | 1993-04-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2119335A1 true CA2119335A1 (en) | 1994-10-09 |
CA2119335C CA2119335C (en) | 2002-03-05 |
Family
ID=21933533
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002119335A Expired - Lifetime CA2119335C (en) | 1993-04-08 | 1994-03-17 | Packet data communication system |
Country Status (10)
Country | Link |
---|---|
US (1) | US5528621A (en) |
EP (1) | EP0619663B1 (en) |
JP (1) | JP3515605B2 (en) |
KR (1) | KR100290435B1 (en) |
AT (1) | ATE227914T1 (en) |
AU (1) | AU667264B2 (en) |
CA (1) | CA2119335C (en) |
DE (1) | DE69431690T2 (en) |
DK (1) | DK0619663T3 (en) |
ES (1) | ES2184747T3 (en) |
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-
1993
- 1993-04-08 US US08/044,648 patent/US5528621A/en not_active Expired - Lifetime
-
1994
- 1994-03-17 CA CA002119335A patent/CA2119335C/en not_active Expired - Lifetime
- 1994-03-30 ES ES94105049T patent/ES2184747T3/en not_active Expired - Lifetime
- 1994-03-30 EP EP94105049A patent/EP0619663B1/en not_active Expired - Lifetime
- 1994-03-30 DE DE69431690T patent/DE69431690T2/en not_active Expired - Lifetime
- 1994-03-30 DK DK94105049T patent/DK0619663T3/en active
- 1994-03-30 AT AT94105049T patent/ATE227914T1/en active
- 1994-04-02 KR KR1019940006993A patent/KR100290435B1/en not_active IP Right Cessation
- 1994-04-06 AU AU59319/94A patent/AU667264B2/en not_active Expired
- 1994-04-07 JP JP06884794A patent/JP3515605B2/en not_active Expired - Lifetime
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JP3515605B2 (en) | 2004-04-05 |
KR940025232A (en) | 1994-11-19 |
AU5931994A (en) | 1994-10-13 |
KR100290435B1 (en) | 2001-09-17 |
ES2184747T3 (en) | 2003-04-16 |
EP0619663A3 (en) | 1995-08-16 |
US5528621A (en) | 1996-06-18 |
DK0619663T3 (en) | 2003-02-10 |
EP0619663A2 (en) | 1994-10-12 |
JPH0799500A (en) | 1995-04-11 |
DE69431690T2 (en) | 2003-08-21 |
EP0619663B1 (en) | 2002-11-13 |
ATE227914T1 (en) | 2002-11-15 |
DE69431690D1 (en) | 2002-12-19 |
CA2119335C (en) | 2002-03-05 |
AU667264B2 (en) | 1996-03-14 |
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