Low-power wireless beaconing network supporting proximal formation, separation and reformation

• US 20020123345A1
• Filed: 09/21/2001
• Published: 09/05/2002
• Est. Priority Date: 02/06/1997
• Status: Abandoned Application

• Current Assignee: Joseph J. Kubler, Ronald L. Mahany, Thomas J. Schuster
• Original Assignee: Joseph J. Kubler, Ronald L. Mahany, Thomas J. Schuster
• Inventors: Mahany, Ronald L., Kubler, Joseph J., Schuster, Thomas J.
• Application Number:
  US09/960,837
• Publication Number:
  US 20020123345A1
• Time in Patent Office: Days
• US Class Current: 455/432.1
• CPC Class Codes: H04W 4/80 Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 52/0274 by switching on or off the equipment or parts thereof
• CPC Class Codes: H04W 56/002 Mutual synchronization
• CPC Class Codes: H04W 76/19 Connection re-establishment
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A low power wireless communication (personal LAN) system includes a plurality of wireless devices with each wireless device including a radio transceiver. The radio transceiver may take the form of an insertable card that fits within a slot in the wireless device. The plurality of wireless devices establishes a wireless network with at least two of the plurality of wireless devices share beaconing responsibilities to coordinate operation of the wireless network. The beaconing responsibilities may be shared on a round robin basis or may be shared according to the operating characteristics of the wireless devices with some wireless devices assuming greater beaconing responsibilities than other of the wireless devices. One of the plurality of wireless devices may separate from the wireless network to become a separated wireless device. In such case, at least one of the wireless devices attempts to reestablish communications with the separated wireless device. Further, the separated wireless device may also attempt to reestablish communication with the wireless network. At least two of the wireless devices may separate from the wireless network to form an alternate wireless network separate from the wireless network. In such case, the at least two wireless devices of the alternate network may rejoin the wireless network after the separation. The wireless devices may establish the wireless network when proximate to one another and operating at a lower power level while continuing operation at a higher power level. The wireless devices establish the wireless network when in a first proximity to one another and continue to communicate while in a second proximity to one another.

Claims

1. A wireless communication system comprising:

a plurality of wireless devices, each wireless device including a radio, that together participate in a first wireless roaming network when within range of one another; and

at least two of the plurality of wireless devices, when moved out of range of the other of the plurality of wireless devices, automatically attempting to establish a second wireless roaming network to support communication between the at least two of the plurality of wireless devices.

2. The wireless communication system of claim 1 wherein at least one of the other of the plurality of wireless devices attempts to maintain operation of the first wireless roaming network.

3. The wireless communication system of claim 1 wherein at least one of the other of the plurality of wireless devices attempts to identify whether any of the plurality of wireless devices are not participating on the first wireless roaming network.

4. The wireless communication system of claim 3 wherein the at least one of the other of the plurality of wireless devices attempts to rescue any of the plurality of wireless devices that are not participating on the first wireless roaming network.

5. The wireless communication system of claim 4 wherein the radios of the plurality of wireless devices utilize frequency hopping transmission sequences, and the attempt to rescue involves visiting at least one frequency of the frequency hopping transmission sequences more often than the other frequencies of the frequency hopping transmission sequences.

6. The wireless communication system of claim 1 wherein any of the plurality of wireless devices that determine that they no longer participate on the first wireless roaming network attempt to reconnect to the first wireless local area network.

7. The wireless communication system of claim 6 wherein the radios of the plurality of wireless devices utilize frequency hopping transmission sequences, and the attempt to reconnect involves visiting at least one frequency of the frequency hopping transmission sequences at least more often than the other frequencies of the frequency hopping transmission sequences.

8. The wireless communication system of claim 1 wherein more than one of the plurality of wireless devices share beaconing responsibilities.

9. The wireless communication system of claim 8 wherein the beaconing responsibilities are not equally shared amongst the more than one of the plurality of wire less devices.

10. The wireless communication system of claim 8 wherein the beaconing responsibilities are managed in a round robin sequence.

11. The wireless communication system of claim 1 further comprising a higher power wireless link independent from the first and second wireless roaming networks, and at least one of the plurality of wireless devices communicates with the higher power wireless link.

12. The wireless communication system of claim 11 further comprising a wired network coupled to the first wireless roaming network via the at least one of the plurality of wireless devices using the higher power wireless link.

13. The wireless communication system of claim 1 wherein the at least two of the plurality of wireless devices rejoin the first wireless roaming network when moving within range of the others of the plurality of wireless devices.

14. The wireless communication system of claim 1 wherein one of the plurality of wireless devices comprises a portable terminal with a removable battery, and the wireless communication system supporting continued operation of the first wireless roaming network during replacement of the removable battery.

15. The wireless communication system of claim 1 wherein the plurality of wireless devices initiate operation of the first wireless roaming network through reduced power transmissions.

16. The wireless communication system of claim 15 wherein the plurality of wireless devices are placed in close proximity of one another to initiate operation of the first wireless roaming network.

17. The wireless communication system of claim 1 wherein the radios of the plurality of wireless devices each support a smart and a dumb interface.

19. The wireless communication system of claim 18, wherein the attempting to establish communication by the at least one of the plurality of wireless devices comprises a search and rescue operation.

20. The wireless communication system of claim 18, the first and second subsets of the plurality of frequencies each including at least one common frequency.

21. The wireless communication system of claim 18, further comprising:

the at least one of the plurality of wireless devices attempting to establish communication with the one other of the plurality of wireless devices using a third subset of the plurality of frequencies if the attempting to establish communication using the first subset of the plurality of frequencies proves unsuccessful.

22. The wireless communication system of claim 18, further comprising:

the one other of the plurality of wireless devices using a third subset of the plurality of frequencies to facilitate the establishment of communication with the at least one of the plurality of wireless devices if communication is not established using the second subset of the plurality of frequencies.

24. The wireless communication system of claim 23, wherein the attempting to establish communication by the first of the plurality of wireless devices comprises a search and rescue operation.

25. The wireless communication system of claim 23, further comprising:

the first of the plurality of wireless devices attempting to establish communication with the second of the plurality of wireless devices using a third subset of the plurality of frequencies if the attempting to establish communication using the first subset of the plurality of frequencies proves unsuccessful.

26. The wireless communication system of claim 23, further comprising:

the second of the plurality of wireless devices using a third subset of the plurality of frequencies to facilitate the establishment of communication with the first of the plurality of wireless devices if communication is not established using the second subset of the plurality of frequencies.

18. A wireless communication system using frequency hopping protocol that uses a plurality of frequencies, the wireless communication system comprising:

a plurality of wireless devices, each wireless device including a wireless transceiver that uses each of the plurality of frequencies to communicate according to the frequency hopping protocol;

at least one of the plurality of wireless devices attempting to establish communication with one other of the plurality of wireless devices using a first subset of the plurality of frequencies;

the one other of the plurality of wireless devices using a second subset of the plurality of frequencies to facilitate the establishment of communication with the first of the plurality of wireless devices; and

each of the plurality of wireless devices that have established communication utilizing each of the plurality of frequencies to maintain communication.

23. A wireless communication system using frequency hopping protocol that uses a plurality of frequencies, the wireless communication system comprising:

a plurality of wireless devices, each wireless device including a wireless transceiver that uses each of the plurality of frequencies to communicate according to the frequency hopping protocol;

a first of the plurality of wireless devices attempting to establish communication with a second of the plurality of wireless devices by sequentially transmitting on a first subset of the plurality of frequencies;

the second of the plurality of wireless devices attempting to receive on a second subset of the plurality of frequencies to facilitate the establishment of communication with the first of the plurality of wireless devices; and

the first and second subsets of the plurality of frequencies each including at least one common frequency.