Method and apparatus for establishing a data link between a portable data communications device and an interface circuit

• US 6,298,047 B1
• Filed: 05/20/1998
• Issued: 10/02/2001
• Est. Priority Date: 05/20/1998
• Status: Expired due to Fees

• Current Assignee: Steelcase Development Corporation (Steelcase Incorporated)
• Original Assignee: Steelcase Development Inc.
• Inventors: Tonizzo, Anthony, Steffes, Christopher Carl, Vallillee, George William IV
• Primary Examiner(s): Ton, Dang
• Assistant Examiner(s): Sam, Phirin
• Application Number:
  US09/081,726
• Time in Patent Office: 1,231 Days
• Field of Search: 370/310, 370/396, 370/328, 370/338, 370/339, 370/340, 320/270, 320/304, 320/312, 320/313, 320/319, 320/324, 320/326, 320/327, 320/334, 320/339, 320/350, 320/352, 320/353, 320/356, 320/394, 455/428, 455/430, 455/434, 455/32.1, 455/524, 455/525, 455/88, 455/560, 455/102, 455/136, 455/138, 455/161.1
• US Class Current: 370/310
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02

Abstract

A wireless data communication system for establishing a data link between a portable communication device and an interface circuit, such as an interface circuit to a LAN, includes a plurality of transceivers in communication with a control circuit. Each of the transceivers is configured to transmit and receive wireless signals within a defined transceiver space. The plurality of transceiver spaces combine to define a communication space. The control circuit detects the presence of a wireless signal within the communications space by sequentially scanning the transceivers to determine which transceiver is receiving the signal. Once the signal is detected, the control circuit automatically locks onto the transceiver receiving the signal, thereby enabling establishment of a wireless data link between the communication device and the interface circuit. The control circuit continues to monitor the established data link to determine whether data communications are disrupted. Upon detection of a disruption, the control circuit automatically attempts to retain the data link by re-initiating the scanning sequence.

Claims

1. A data communication system for establishing and retaining a data link between an interface circuit and a communication device having a wireless port for transmitting and receiving a wireless signal, the system comprising:

an interface circuit;

a plurality of transceivers in communication with the interface circuit, each transceiver configured to transmit and receive a wireless signal within a transceiver space associated with the respective transceiver; and

a control circuit in communication with the interface circuit and the plurality of transceivers, the control circuit configured to scan the plurality of transceivers in a scanning sequence to detect presence of a wireless signal within any one of the plurality of transceiver spaces;

wherein, when the wireless port transmits a wireless signal within one of the plurality of transceiver spaces, the control circuit automatically locks onto the transceiver associated with the transceiver space in which the wireless signal was detected, thereby enabling the data link between the interface circuit and the communication device.

2. The data communication system as recited in claim 1, wherein the control circuit locks onto the first transceiver in the scanning sequence associated with the transceiver space in which the wireless signal was first detected.

3. The data communication system as recited in claim 1, wherein the control circuit monitors the data link established between the wireless port and the interface circuit to detect disruption of data flow on the data link.

4. The data communication system as recited in claim 3, wherein if the disruption of the data flow is detected for greater than a predetermined time period, the control circuit recommences the scanning sequence.

5. The data communication system as recited in claim 4, wherein the predetermined time period is in the range of approximately 0.5 to 5 seconds.

6. The data communication system as recited in claim 4, wherein the predetermined time period is 1 second.

7. The data communication system as recited in claim 1, wherein the interface circuit is in communication with a LAN.

8. The data communication system as recited in claim 1, wherein the plurality of transceivers are disposed in distinct locations within a work space.

9. The data communication system as recited in claim 8, further including an article of furniture, wherein the distinct locations are associated with the article of furniture.

10. The data communication system as recited in claim 9, wherein the article of furniture includes a work surface and the communication device is positioned on the work surface to establish the data link.

11. The data communication system as recited in claim 9, wherein the plurality of transceivers are at least partially embedded within the article of furniture.

12. The data communication system as recited in claim 1, wherein the communications device is a portable computing device.

13. The data communication system as recited in claim 1, wherein the data link is a line-of-sight infrared data link.

14. A method for establishing and retaining a data link between a communication device having a wireless communication port and an interface circuit in communication with a plurality of transceivers, each of the transceivers configured to receive and transmit wireless signals within a transceiver space associated with the respective transceiver, the plurality of transceiver spaces defining a communication space, the method comprising:

transmitting a wireless signal within the communication space from the wireless communication port of the communication device;

sequentially scanning each of the plurality of transceivers;

detecting presence of the wireless signal within at least one of the transceiver spaces defining the communication space; and

locking onto the transceiver associated with the at least one transceiver space in which the wireless signal is present to establish the data link between the communication device and the interface circuit.

15. The method as recited in claim 14, further comprising monitoring the data link to detect disruption of receipt of the wireless signal.

16. The method as recited in claim 15, further comprising generating a warning to indicate the disruption.

17. The method as recited in claim 15, further comprising recommencing sequentially scanning the plurality of transceivers if the detected disruption occurs for greater than a first predetermined time period.

18. The method as recited in claim 17, wherein the first predetermined time period is in the range of approximately 0.5 to 5 seconds.

19. The method as recited in claim 17, further comprising reestablishing the data link if presence of a wireless signal transmitted from the wireless port of the communication device is detected within a second predetermined time period.

20. The method as recited in claim 19, wherein the second predetermined time period is in the range of approximately 3 to 40 seconds.

21. The method as recited in claim 14, wherein the plurality of transceivers are disposed at discrete locations within a work space.

22. The method as recited in claim 21, further comprising an article of furniture disposed within the work space, wherein the discrete locations are associated with the article of furniture.

23. The method as recited in claim 21, wherein the article of furniture includes a work surface and the wireless signal from the wireless communication port of the communication device is transmitted while the communication device is positioned on the work surface.

24. The method as recited in claim 22, wherein the plurality of transceivers are at least partially embedded within the article of furniture.

25. The method as recited in claim 14, further comprising:

detecting presence of a second wireless signal within at least one of the transceiver spaces defining the communication space, the second infrared signal being transmitted from a wireless communication port of a second communication device; and

terminating the data link if the second communication device is not removed within a predetermined time period.

26. The method as recited in claim 14, wherein the interface circuit is in communication with a LAN.

27. The method as recited in claim 14, wherein the data link is a line-of-sight infrared data link.

28. An infrared data communications system for establishing and retaining a data link between a network and a communication device disposed in a work space, the system comprising:

an article of furniture disposed in the work space;

a plurality of infrared transceivers disposed at discrete locations associated with the article of furniture such that the plurality of infrared transceivers transmit and receive infrared signals within a communication space; and

a control circuit in communication with the plurality of infrared transceivers and the network and configured to detect presence of a line-of-sight infrared signal within the communication space, the line-of-sight infrared signal being transmitted by the communication device;

wherein the control circuit locks onto one of the plurality of infrared transceivers upon detection of the infrared signal in the communication space, thereby enabling the data link between the network and the communication device.

29. The system as recited in claim 28, wherein the communication space is defined by a plurality of transceiver spaces, each of the transceiver spaces being associated with one of the plurality of transceivers, and the control circuit locks onto the transceiver associated with the transceiver space in which the infrared signal is detected.

30. The system as recited in claim 28, wherein the article of furniture includes a work surface and the plurality of infrared transceivers are at least partially embedded in the work surface.

31. The system as recited in claim 28, wherein the control circuit detects the presence of the infrared signal by scanning the plurality of transceivers in a scanning sequence to determine whether one of the plurality of transceivers is receiving the infrared signal.

32. The system as recited in claim 31, wherein the control circuit monitors the data link to detect disruption of data flow.

33. The system as recited in claim 32, wherein the control circuit recommences the scanning sequence if the disruption occurs for greater than a first period of time.

34. The system as recited in claim 33, wherein the first period of time is in the range of approximately 0.5 second to 5 seconds.

35. The system as recited in claim 33, wherein the data link between the network and the communication device is terminated if the disruption occurs for greater than a second period of time.

36. The system as recited in claim 35, wherein the second period of time is in the range of approximately 3 to 40 seconds.

37. A data communication system for establishing a data link between an interface circuit and a communication device having a wireless port for transmitting and receiving a wireless signal, the system comprising:

an interface circuit;

a plurality of transceivers, each transceiver configured to transmit and receive a wireless signal within a transceiver space associated with the respective transceiver; and

a control circuit in communication with the interface circuit and the plurality of transceivers, the control circuit configured to scan the plurality of transceivers in a scanning sequence to detect presence of a wireless signal within any one of the plurality of transceiver spaces;

wherein, when the wireless port transmits a wireless signal within one of the plurality of transceiver spaces, the control circuit automatically locks onto the transceiver associated with the transceiver space in which the wireless signal was detected, thereby enabling the data link between the interface circuit and the communication device;

wherein the control circuit monitors the data link established between the wireless port and the interface circuit to detect disruption of data flow on the data link; and

wherein if the disruption of the data flow is detected for greater than a predetermined time period, the control circuit recommences the scanning sequence.

38. The data communication system as recited in claim 37, wherein the control circuit locks onto the first transceiver in the scanning sequence associated with the transceiver space in which the wireless signal was first detected.

39. The data communication system as recited in claim 37, wherein the predetermined time period is in the range of approximately 0.5 to 5 seconds.

40. The data communication system as recited in claim 37, wherein the predetermined time period is 1 second.

41. The data communication system as recited in claim 37, wherein the interface circuit is in communication with a LAN.

42. The data communication system as recited in claim 37, wherein the plurality of transceivers are disposed in distinct locations within a work space.

43. The data communication system as recited in claim 42, further including an article of furniture, wherein the distinct locations are associated with the article of furniture.

44. The data communication system as recited in claim 43, wherein the article of furniture includes a work surface and the communication device is positioned on the work surface to establish the data link.

45. The data communication system as recited in claim 43, wherein the plurality of transceivers are at least partially embedded within the article of furniture.

46. The data communication system as recited in claim 37, wherein the communications device is a portable computing device.

47. The data communication system as recited in claim 37, wherein the data link is a line-of-sight infrared data link.

48. A method for establishing a data link between a communication device having a wireless communication port and an interface circuit in communication with a plurality of transceivers, each of the transceivers configured to receive and transmit wireless signals within a transceiver space associated with the respective transceiver, the plurality of transceiver spaces defining a communication space, the method comprising:

transmitting a wireless signal within the communication space from the wireless communication port of the communication device;

sequentially scanning each of the plurality of transceivers;

detecting presence of the wireless signal within at least one of the transceiver spaces defining the communication space;

locking onto the transceiver associated with the at least one transceiver space in which the wireless signal is present to establish the data link between the communication device and the interface circuit;

monitoring the data link to detect disruption of receipt of the wireless signal; and

recommencing sequentially scanning the plurality of transceivers if the detected disruption occurs for greater than a first predetermined time period.

49. The method as recited in claim 48, further comprising generating a warning to indicate the disruption.

50. The method as recited in claim 48, wherein the first predetermined time period is in the range of approximately 0.5 to 5 seconds.

51. The method as recited in claim 48, further comprising re-establishing the data link if presence of a wireless signal transmitted from the wireless port of the communication device is detected within a second predetermined time period.

52. The method as recited in claim 51, wherein the second predetermined time period is in the range of approximately 3 to 40 seconds.

53. The method as recited in claim 48, wherein the plurality of transceivers are disposed at discrete locations within a work space.

54. The method as recited in claim 53, further comprising an article of furniture disposed within the work space, wherein the discrete locations are associated with the article of furniture.

55. The method as recited in claim 53, wherein the article of furniture includes a work surface and the wireless signal from the wireless communication port of the communication device is transmitted while the communication device is positioned on the work surface.

56. The method as recited in claim 54, wherein the plurality of transceivers are at least partially embedded within the article of furniture.

57. The method as recited in claim 48, further comprising:

detecting presence of a second wireless signal within at least one of the transceiver spaces defining the communication space, the second infrared signal being transmitted from a wireless communication port of a second communication device; and

terminating the data link if the second communication device is not removed within a predetermined time period.

58. The method as recited in claim 48, wherein the interface circuit is in communication with a LAN.

59. The method as recited in claim 48, wherein the data link is a line-of-sight infrared data link.

60. An infrared data communications system for establishing a data link between a network and a communication device disposed in a work space, the system comprising:

an article of furniture disposed in the work space;

a plurality of infrared transceivers disposed at discrete locations associated with the article of furniture such that the plurality of infrared transceivers transmit and receive infrared signals within a communication space; and

a control circuit in communication with the plurality of infrared transceivers and the network and configured to detect presence of a line-of sight infrared signal within the communication space, the line-of-sight infrared signal being transmitted by the communication device;

wherein the control circuit locks onto one of the plurality of infrared transceivers upon detection of the infrared signal in the communication space, thereby maintaining the data link between the network and the communication device;

wherein the control circuit detects the presence of the infrared signal by scanning the plurality of transceivers in a scanning sequence to determine whether one of the plurality of transceivers is receiving the infrared signal; and

wherein the control circuit monitors the data link to detect disruption of data flow and recommences the scanning sequence if the disruption occurs for greater than a first period of time.

61. The system as recited in claim 60, wherein the communication space is defined by a plurality of transceiver spaces, each of the transceiver spaces being associated with one of the plurality of transceivers, and the control circuit locks onto the transceiver associated with the transceiver space in which the infrared signal is detected.

62. The system as recited in claim 60, wherein the article of furniture includes a work surface and the plurality of infrared transceivers are at least partially embedded in the work surface.

63. The system as recited in claim 60, wherein the first period of time is in the range of approximately 0.5 second to 5 seconds.

64. The system as recited in claim 60, wherein the data link between the network and the communication device is terminated if the disruption occurs for greater than a second period of time.

65. The system as recited in claim 64, wherein the second period of time is in the range of approximately 3 to 40 seconds.