Radio frequency local area network

• US 6,046,992 A
• Filed: 04/24/1998
• Issued: 04/04/2000
• Est. Priority Date: 10/01/1991
• Status: Expired due to Fees

• Current Assignee: Innovatio IP Ventures LLC
• Original Assignee: Intermec IP Corporation (Honeywell International Inc.)
• Inventors: Meier, Robert C., Luse, Ronald E.
• Primary Examiner(s): Pham, Chi H.
• Assistant Examiner(s): Duong, Frank
• Application Number:
  US09/066,125
• Time in Patent Office: 711 Days
• Field of Search: 370/256, 370/338, 370/400, 370/401, 370/402, 370/403, 370/328, 375/200, 375/206
• US Class Current: 370/338
• CPC Class Codes: G06F 1/1626 with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]
• CPC Class Codes: G06F 15/0225 User interface arrangements, e.g. keyboard, display; Interfaces to other computer systems
• CPC Class Codes: G06K 7/1098 the scanning arrangement having a modular construction
• CPC Class Codes: H01Q 1/007 specially adapted for indoor communication
• CPC Class Codes: H01Q 1/241 used in mobile communications, e.g. GSM H01Q1/247, H01Q1/248 take precedence
• CPC Class Codes: H01Q 21/24 Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001
• CPC Class Codes: H04L 12/12 Arrangements for remote connection or disconnection of substations or of equipment thereof
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 45/04 Interdomain routing, e.g. hierarchical routing
• CPC Class Codes: H04L 45/44 Distributed routing
• CPC Class Codes: H04L 45/48 Routing tree calculation
• CPC Class Codes: H04L 45/488 using root node determination
• CPC Class Codes: H04L 69/14 Multichannel or multilink protocols
• CPC Class Codes: H04L 69/32 Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
• CPC Class Codes: H04L 69/324 in the data link layer [OSI layer 2], e.g. HDLC
• CPC Class Codes: H04L 69/325 in the network layer [OSI layer 3], e.g. X.25 H04L69/16 takes precedence
• CPC Class Codes: H04L 69/326 in the transport layer [OSI layer 4] H04L69/16 takes precedence
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04W 40/00 Communication routing or communication path finding
• CPC Class Codes: H04W 40/02 Communication route or path selection, e.g. power-based or shortest path routing
• CPC Class Codes: H04W 40/08 : based on transmission power
• CPC Class Codes: H04W 40/24 : Connectivity information management, e.g. connectivity discovery or connectivity update
• CPC Class Codes: H04W 40/34 : Modification of an existing route
• CPC Class Codes: H04W 84/04 : Large scale networks; Deep hierarchical networks
• CPC Class Codes: H04W 84/12 : WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/04 : adapted for relaying to or from another terminal or user
• CPC Class Codes: H04W 88/08 : Access point devices
• CPC Class Codes: H04W 88/14 : Backbone network devices
• CPC Class Codes: H04W 88/16 : Gateway arrangements
• CPC Class Codes: H04W 92/20 : between access points
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

An apparatus and a method for routing data in a radio data communication system having one or more host computers, one or more intermediate base stations, and one or more RF terminals organizes the intermediate base stations into an optimal spanning-tree network to control the routing of data to and from the RF terminals and the host computer efficiently and dynamically. Communication between the host computer and the RF terminals is achieved by using the network of intermediate base stations to transmit the data.

Claims

1. A data communication network having wireless communication capability for providing communication pathways within a premises, said data communication network comprising:

a host computer;

a plurality of wireless mobile terminal nodes;

a plurality of bridging nodes located in spaced relation throughout the premises;

each of said plurality of wireless mobile terminal nodes selecting at least one of the plurality of bridging nodes within the premises with which to communicate; and

said plurality of bridging nodes dynamically creating and revising wireless communication pathways between said plurality of bridging nodes to support communication exchanges between any two of said plurality of wireless mobile terminal nodes without requiring participation by the host computer in the communication exchanges as said plurality of wireless mobile terminal nodes roam among said plurality of bridging nodes within the premises.

2. The data communication network of claim 1 wherein at least two of said plurality of bridging nodes are wireless bridging nodes.

3. The data communication network of claim 1 wherein the plurality of wireless mobile terminal nodes are wireless portable data collection terminals.

4. The data communication network of claim 3 wherein at least one of the plurality of wireless portable data collection terminals includes a keyboard for collecting data.

5. The data communication network of claim 3 wherein at least one of the plurality of wireless portable data collection terminals includes a bar code reader for collecting data.

6. The data communication network of claim 5 wherein the at least one of the plurality of wireless portable data collection terminals and the bar code reader are integrated.

7. A data collection network having wireless communication capability for providing communication pathways within a premises, said data collection network comprising:

a plurality of wireless portable data collection terminals;

a plurality of bridges located in spaced relation within the premises, at least two of said plurality of bridges comprising wireless bridges;

each of said plurality of wireless portable data collection terminals selecting at least one of the plurality of bridges within the premises with which to communicate; and

said plurality of bridges together forming a spanning tree for maintaining communication pathways between any two of said plurality of wireless portable data collection terminals as said wireless portable data collection terminals roam within the premises.

8. The data collection network of claim 7 further comprising a host computer.

9. The data collection network of claim 8 wherein the communication pathways do not involve relaying by the host computer.

10. The data collection network of claim 7 wherein at least one of the plurality of wireless portable data collection terminals includes a keyboard for collecting data.

11. The data collection network of claim 7 wherein at least one of the plurality of wireless portable data collection terminals includes a bar code reader for collecting data.

12. The data collection network of claim 11 wherein the at least one of the plurality of wireless portable data collection terminals and the bar code reader are integrated.

13. A data collection network having wireless communication capability for providing communication pathways within a premises, said data collection network comprising:

a first wireless portable data collection terminal;

a second wireless portable data collection terminal;

a plurality of bridges located in spaced relation within the premises;

said first wireless portable data collection terminal and said second wireless portable data collection terminal selecting at least one of the plurality of bridges within the premises with which to communicate; and

said plurality of bridges forming wireless communication pathways between said plurality of bridges to permit said first and second wireless data collection terminals to communicate as said first and second wireless portable data collection terminals roam within the premises.

14. The data collection network of claim 13 further comprising a host computer, and wherein the wireless communication pathways do not involve the host computer.

15. The data collection network of claim 13 wherein at least one of the first and second wireless portable data collection terminals includes a keyboard for collecting data.

16. The data collection network of claim 13 wherein at least one of the first and second wireless portable data collection terminals includes a bar code reader for collecting data.

17. The data collection network of claim 16 wherein the at least one of the first and second wireless portable data collection terminals and the bar code reader are integrated.

18. A data communication network having wireless communication capability for providing communication pathways within a premises, said data communication network comprising:

a first wireless mobile terminal node;

a second wireless mobile terminal node;

a plurality of bridging nodes located in spaced relation within the premises, at least two of said plurality of bridging nodes comprising wireless bridging nodes;

said first wireless mobile terminal node and said second wireless mobile terminal node selecting at least one of the plurality of bridging nodes within the premises with which to communicate; and

said plurality of bridging nodes establishing and maintaining communication connectivity between the first and second wireless mobile terminal nodes as said first and second wireless mobile terminal nodes roam among the plurality of bridging nodes within the premises.

19. The data communication network of claim 18 further comprising a host computer, and wherein the means for establishing and maintaining communication connectivity does not require relaying by the host computer.

20. The data communication network of claim 18 wherein the first and second wireless mobile terminal nodes are wireless portable data terminals.

21. The data communication network of claim 20 wherein at least one of the first and second wireless portable data collection terminals includes a keyboard for collecting data.

22. The data communication network of claim 20 wherein at least one of the first and second wireless portable data collection terminals includes a bar code reader for collecting data.

23. The data communication network of claim 22 wherein the at least one of the first and second wireless portable data collection terminals and the bar code reader are integrated.