Remote radio data communication system with data rate switching

• US 7,672,674 B2
• Filed: 04/27/2004
• Issued: 03/02/2010
• Est. Priority Date: 08/04/1988
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Mahany, Ronald L.
• Primary Examiner(s): Vo; Nguyen
• Application Number:
  US10/833,023
• Publication Number:
  US 20040203834A1
• Time in Patent Office: 2,135 Days
• Field of Search: 455/450, 455/451, 455/452.1, 455/504, 455/506, 455/509, 455/513, 455/452.2, 370/329, 370/346, 370/449
• US Class Current: 455/452.2
• CPC Class Codes: G06F 1/163 Wearable computers, e.g. on a belt
• CPC Class Codes: G06F 1/1632 External expansion units, e.g. docking stations
• CPC Class Codes: G06K 17/0022 arrangements or provisious for transferring data to distant stations, e.g. from a sensing device "transfer between computer elements G06F13/00 "; data-transmission H04L
• CPC Class Codes: G06K 7/10722 Photodetector array or CCD scanning
• CPC Class Codes: G06K 7/10881 constructional details of hand-held scanners
• CPC Class Codes: G06K 7/1093 sensing, after transfer of the image of the data-field to an intermediate store, e.g. storage with cathode ray tube
• CPC Class Codes: G06K 7/1098 the scanning arrangement having a modular construction
• CPC Class Codes: G06Q 10/08 Logistics, e.g. warehousing, loading or distribution; Inventory or stock management
• CPC Class Codes: G06Q 20/343 Cards including a counter
• CPC Class Codes: G07F 7/02 by keys or other credit registering devices
• CPC Class Codes: G07G 1/0045 with a code reader for reading of an identifying code of the article to be registered, e.g. barcode reader or radio-frequency identity [RFID] reader
• CPC Class Codes: G08C 17/02 using a radio link
• CPC Class Codes: G08C 2201/20 Binding and programming of remote control devices
• CPC Class Codes: H01Q 1/22 by structural association with other equipment or articles
• CPC Class Codes: H02J 9/005 using a power saving mode for copiers G03G15/5004
• CPC Class Codes: H04B 1/3883 Arrangements for mounting batteries or battery chargers
• CPC Class Codes: H04B 1/69 Spread spectrum techniques
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04B 17/0085 using test signal generators
• CPC Class Codes: H04B 17/309 : Measuring or estimating channel quality parameters
• CPC Class Codes: H04B 17/318 : Received signal strength
• CPC Class Codes: H04B 2001/3894 : Waterproofing of transmission device
• CPC Class Codes: H04B 2201/7071 : with dynamic control of receiver resources
• CPC Class Codes: H04L 1/0002 : by adapting the transmission rate
• CPC Class Codes: H04L 1/0003 : by switching between different modulation schemes
• CPC Class Codes: H04L 1/0007 : by modifying the frame length
• CPC Class Codes: H04L 1/0014 : by adapting the source coding
• CPC Class Codes: H04L 1/0025 : Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0032 : Without explicit signalling
• CPC Class Codes: H04L 69/18 : Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
• CPC Class Codes: H04L 69/24 : Negotiation of communication capabilities
• CPC Class Codes: H04L 9/40 : Network security protocols
• CPC Class Codes: H04W 52/029 : reducing the clock frequency of the controller
• CPC Class Codes: H04W 52/343 : taking into account loading or congestion level
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

Systems and methods that provide wireless communications are provided. One or more of the systems and methods may include, for example, selecting a lower data rate or a higher data rate based upon at least an evaluation of the operating conditions of a radio network. The evaluation may include, for example, computing a weighted signal strength measurement in which the weighting gives emphasis to the lower signal strength measurements of fading radio frequency signals.

Claims

1. A system for providing wireless spread spectrum communication, comprising:

a base station transceiver capable of wireless spread spectrum communication with a plurality of mobile wireless transceivers via a wireless network, each of the plurality of wireless mobile transceivers employing one of a first data rate and a second data rate based upon an evaluation of radio frequency operating conditions of the wireless network, the first data rate being higher than the second data rate, the evaluation of the radio frequency operating conditions comprising an evaluation of a signal strength measurement, the evaluation of the signal strength measurement comprising a weighted signal strength measurement that emphasizes lower signal strength measurements of fading signals;

the base station transceiver transmitting one or more messages usable by the plurality of mobile transceivers in performing the evaluation of radio frequency operating conditions of the wireless network; and

a particular wireless mobile transceiver of the plurality of wireless mobile transceivers cycling between a power saving state and an active state over predetermined time intervals, the particular wireless mobile transceiver returning to the power saving state from the active state if the particular wireless transceiver receives no transmission directed to the particular wireless mobile transceiver while in the active state for a predetermined time interval.

2. The system of claim 1 wherein the wireless spread spectrum communication comprises direct sequence spread spectrum communication.

3. The system of claim 1 wherein the wireless spread spectrum communication comprises wireless communication using frequency hopping.

4. The system of claim 1 wherein evaluation of radio frequency operating conditions of the wireless network comprises evaluating an error rate.

5. The system of claim 4 wherein evaluating an error rate comprises evaluating at least one of a bit error rate (BER), a message error rate, a frame error rate, a rate of receipt of a negative acknowledgement, a rate of failure to receive a positive acknowledgement, a rate of failure to receive a response to a transmission, and a timeout of a communications protocol timer.

6. The system of claim 1 wherein the one or more messages comprise a polling message.

7. The system of claim 1 wherein the one or more messages comprise a test signal.

8. The system of claim 1 wherein at least a portion of the one or more messages is transmitted at the first data rate to evaluate whether operation at the first data rate is sustainable.

9. The system of claim 1 wherein at least a portion of the one or more messages is transmitted on a periodic basis.

10. The system of claim 1 wherein each of the one or more messages has an associated type, and wherein messages of a predetermined type are always transmitted by the base station transceiver at the second data rate.

11. The system of claim 1 wherein the base station transceiver employs one of the first data rate and the second data rate for transmission, based upon an evaluation of operation of the wireless network.

12. The system of claim 11 wherein evaluation of operation of the wireless network comprises evaluating an error rate.

13. The system of claim 12 wherein evaluating an error rate comprises evaluating at least one of a bit error rate (BER), a message error rate, a frame error rate, a rate of receipt of a negative acknowledgement, a rate of failure to receive a positive acknowledgement, a rate of failure to receive a response to a transmission, and a timeout of a communications protocol timer.

14. The system of claim 1 wherein at least one of the plurality of mobile wireless transceivers is capable of adjusting spreading code length for use in the wireless spread spectrum communications.

15. The system of claim 1 wherein at least one of the plurality of mobile wireless transceivers is capable of switching between a first frequency hopping rate and at a second frequency hopping rate for use in the wireless spread spectrum communications, the first frequency hopping rate being slower than the second frequency hopping rate.

16. A method for providing wireless spread spectrum communication, comprising:

receiving at least one data message via the wireless spread spectrum communication network;

evaluating wireless communication network operating conditions based upon the received at least one data message, the wireless communication network operating conditions evaluation comprising a signal strength measurement evaluation that comprises a weighted signal strength measurement evaluation in which emphasis is given to lower signal strength measurements of fading signals;

selecting one of a first data rate and a second data rate based upon the evaluation of wireless communication network operating conditions, the first data rate being lower than the second data rate;

transmitting at least one data message via the wireless communication network using the selected data rate; and

cycling between a power saving state and an active state over predetermined time intervals, wherein the cycling comprises returning to the power saving state from the active state if no transmissions directed to a particular destination are received while in the active state for a predetermined time interval.

17. The method of claim 16 wherein the wireless communication network uses frequency hopping.

18. The method of claim 16 wherein the wireless communication network uses direct sequence spread spectrum communication.

19. The method of claim 16 wherein evaluating wireless communication network operating conditions comprises evaluating an error rate.

20. The method of claim 19 wherein evaluating an error rate comprises evaluating at least one of a bit error rate (BER), a message error rate, a frame error rate, a rate of receipt of a negative acknowledgement, a rate of failure to receive a positive acknowledgement, a rate of failure to receive a response to a transmission, and a timeout of a communications protocol timer.

21. The method of claim 16 wherein the received at least one data message comprises a polling message.

22. The method of claim 16 wherein the received at least one data message comprises a test signal.

23. The method of claim 16 wherein at least a portion of the received at least one data message is transmitted at the second data rate to evaluate whether operation of the wireless communication network at the second data rate is sustainable.

24. The method of claim 16 wherein at least a portion of the received at least one data message is always received at the first data rate.

25. The method of claim 16 wherein the transmitted at least one data message comprises the selected data rate.

26. The method of claim 16 wherein the wireless communication network is a radio frequency communication network.

27. The method of claim 16 wherein the selecting of the first data rate and the second data rate is effected at least by selecting between a first spreading code length and a second spreading code length for use in the wireless spread spectrum communications, the first spreading code length being shorter than the second spreading code length.

28. The method of claim 16 wherein the selecting of the first data rate and the second data rate is effected at least by selecting between a first frequency hopping rate and at a second frequency hopping rate for use in the wireless spread spectrum communications, the first frequency hopping rate being slower than the second frequency hopping rate.

29. One or more circuits in a wireless spread spectrum communication device, comprising:

receiver circuitry capable of receiving digital information communicated via a radio frequency wireless spread spectrum communication network;

at least one processor that evaluates operating conditions of the radio frequency network, the at least one processor selecting one of a first data rate and a second data rate based upon the evaluation, the first data rate being lower than the second data rate, the evaluation of the operating conditions of the radio frequency network comprising evaluating a signal strength measurement, the signal strength measurement evaluation comprising computing a weighted signal strength measurement that emphasizes lower signal strength measurements of fading radio frequency signals; and

transmitter circuitry capable of transmitting digital information at the selected data rate, via the radio frequency network, the transmitter circuitry operatively coupled to the at least one processor,

wherein the wireless spread spectrum communication device cycles between a power saving state and an active state over predetermined time intervals, and wherein the wireless spread spectrum communication device returns to the power saving state from the active state if the wireless spread spectrum communication device receives no transmission directed to the wireless spread spectrum communication device while in the active state for a predetermined time interval.

30. The one or more circuits of claim 29 further comprising signal strength measurement circuitry operatively coupled to the receiver circuitry, the signal measurement circuitry producing an indication of signal strength of a received radio frequency signal, the indication of signal strength available for use by the at least one processor.

31. The one or more circuits of claim 29 wherein the radio frequency network uses direct sequence spread spectrum communication techniques.

32. The one or more circuits of claim 29 wherein the radio frequency network uses frequency hopping communication.

33. The one or more circuits of claim 29 wherein evaluating operating conditions of the radio frequency network comprises evaluating an error rate.

34. The one or more circuits of claim 33 wherein evaluating an error rate comprises evaluating at least one of a bit error rate (BER), a message error rate, a frame error rate, a rate of receipt of a negative acknowledgement, a rate of failure to receive a positive acknowledgement, a rate of failure to receive a response to a transmission, and a timeout of a communications protocol timer.

35. The one or more circuits of claim 29 wherein evaluating operating conditions of the radio frequency network is performed during reception of one or more messages.

36. The one or more circuits of claim 35 wherein at least a portion of the one or more messages is received on a substantially regular period.

37. The one or more circuits of claim 35 wherein at least a portion of the one or more messages comprise a test signal.

38. The one or more circuits of claim 35 wherein at least a portion of the one or more messages comprise a polling message.

39. The one or more circuits of claim 35 wherein at least a portion of the one or more messages is received at the second data rate to evaluate whether operation of the radio frequency network at the second data rate is sustainable.

40. The one or more circuits of claim 35 wherein each of the one or more messages has an associated type, and wherein messages of a predetermined type are always received at the first data rate.

41. The one or more circuits of claim 29 wherein a receiver and a transmitter operate on the same radio frequency.

42. The one or more circuits of claim 29 wherein the at least one processor is capable of selecting one of a first spreading code length and a second spreading code length for use in the wireless spread spectrum communications, the first spreading code length being shorter than the second spreading code length.

43. The one or more circuits of claim 29 wherein the at least one processor is capable of selecting one of a first frequency hopping rate and at a second frequency hopping rate for use in the wireless spread spectrum communications, the first frequency hopping rate being slower than the second frequency hopping rate.

44. A wireless spread spectrum mobile communication device, comprising:

a mobile wireless transceiver that, during operation, communicates with a base station transceiver via a wireless network that uses spread spectrum communication, the mobile wireless transceiver employing one of a first data rate and a second data rate for transmission, based upon an evaluation of radio frequency operating conditions of the wireless network, the first data rate being higher than the second data rate, the evaluation of the radio frequency operating conditions comprising an evaluation of a signal strength measurement, the evaluation of the signal strength measurement comprising a weighted signal strength measurement that emphasizes lower signal strength measurements of fading signals;

the mobile wireless transceiver receiving one or more messages usable in performing the evaluation of radio frequency operating conditions of the wireless network; and

the mobile wireless transceiver cycling between a power saving state and an active state over predetermined time intervals, the mobile wireless transceiver returning to the power saving state from the active state if the mobile wireless transceiver receives no transmission directed to the mobile wireless transceiver while in the active state for a predetermined time interval.

45. The device of claim 44 wherein the spread spectrum communication comprises frequency hopping communication.

46. The device of claim 44 wherein the spread spectrum communication comprises direct sequence spread spectrum communication.

47. The device of claim 44 wherein the evaluation of radio frequency operating conditions of the wireless network comprises evaluating an error rate.

48. The device of claim 47 wherein evaluating an error rate comprises evaluating at least one of a bit error rate (BER), a message error rate, a frame error rate, a rate of receipt of a negative acknowledgement, a rate of failure to receive a positive acknowledgement, a rate of failure to receive a response to a transmission, and a timeout of a communications protocol timer.

49. The device of claim 44 wherein the one or more messages comprise a polling message.

50. The device of claim 44 wherein the one or more messages comprise a test signal.

51. The device of claim 44 wherein at least a portion of the one or more messages is transmitted at the first data rate to evaluate whether operation at the first data rate is sustainable.

52. The device of claim 44 wherein at least a portion of the one or more messages is transmitted on a periodic basis.

53. The device of claim 44 wherein each of the one or more messages has an associated type, and wherein messages of a predetermined type are always received by the mobile wireless transceiver at the second data rate.

54. The device of claim 44 wherein the mobile transceiver selects one of a first data rate and a second data rate for transmission, based upon an evaluation of operation of the wireless network.

55. The device of claim 54 wherein evaluation of operation of the wireless network comprises evaluating an error rate.

56. The device of claim 55 wherein evaluating an error rate comprises evaluating at least one of a bit error rate (BER), a message error rate, a frame error rate, a rate of receipt of a negative acknowledgement, a rate of failure to receive a positive acknowledgement, a rate of failure to receive a response to a transmission, and a timeout of a communications protocol timer.

57. The device of claim 44 wherein the first data rate and the second data rate are effected at least by adjusting a length of a spreading code for use in the spread spectrum communication.

58. The device of claim 44 wherein the first data rate and the second data rate are effected at least by adjusting a frequency hopping rate for use in the spread spectrum communication.

59. A wireless spread spectrum communication system, comprising:

a mobile device that, during operation, communicates using spread spectrum communication with a base station via a wireless network, the mobile device employing one of a first data rate and a second data rate for transmission, based upon an evaluation of radio frequency operating conditions of the wireless network, the first data rate being higher than the second data rate; and

the mobile device receiving one or more messages usable in performing the evaluation of radio frequency operating conditions of the wireless network,

wherein the evaluation of radio frequency operating conditions of the wireless network comprises evaluating a signal strength measurement,

wherein the evaluation of the signal strength measurement comprises computing a weighted signal strength measurement, the weighting giving emphasis to lower signal strength measurements of fading signals,

wherein the mobile device cycles between a power saving state and an active state over predetermined time intervals, and

wherein the mobile device returns to the power saving state from the active state if the mobile device receives no transmission directed to the mobile device while in the active state for a predetermined time interval.

60. The system of claim 59 wherein the spread spectrum communication employs frequency hopping.

61. The system of claim 59 wherein the spread spectrum communication uses direct sequence codes.

62. The system of claim 59 wherein evaluation of radio frequency operating conditions of the wireless network comprises evaluating an error rate.

63. The system of claim 62 wherein evaluating an error rate comprises evaluating at least one of a bit error rate (BER), a message error rate, a frame error rate, a rate of receipt of a negative acknowledgement, a rate of failure to receive a positive acknowledgement, a rate of failure to receive a response to a transmission, and a timeout of a communications protocol timer.

64. The system of claim 59 wherein the one or more messages comprise a polling message.

65. The system of claim 59 wherein the one or more messages comprise a test signal.

66. The system of claim 59 wherein at least a portion of the one or more messages is transmitted at the first data rate to evaluate whether operation at the first data rate is sustainable.

67. The system of claim 59 wherein at least a portion of the one or more messages is transmitted on a periodic basis.

68. The system of claim 59 wherein each of the one or more messages has an associated type, and wherein messages of a predetermined type are always received by the mobile transceiver at the second data rate.

69. The system of claim 59 wherein the mobile device selects one of the first data rate and the second data rate for transmission, based upon an evaluation of operation of the wireless network.

70. The system of claim 69 wherein evaluation of operation of the wireless network comprises evaluating an error rate.

71. The system of claim 70 wherein evaluating an error rate comprises evaluating at least one of a bit error rate (BER), a message error rate, a frame error rate, a rate of receipt of a negative acknowledgement, a rate of failure to receive a positive acknowledgement, a rate of failure to receive a response to a transmission, and a timeout of a communications protocol timer.

72. The system of claim 59 wherein the wireless spread spectrum communication system is capable of employing a length-adjustable spreading code for use in the spread spectrum communication.

73. The system of claim 59 wherein the wireless spread spectrum communication system is capable of employing an adjustable frequency hopping rate for use in the spread spectrum communication.

74. One or more circuits in a wireless spread spectrum communication device, comprising:

at least one processor that evaluates operating conditions of a radio frequency network, the at least one processor selecting one of a first data rate and a second data rate based upon the evaluation, the first data rate being lower than the second data rate; and

the at least one processor causing transmitter circuitry to transmit information at the selected data rate, via the radio frequency network,

wherein the evaluation of the operating conditions of the radio frequency network comprises evaluating a signal strength measurement,

wherein the evaluation of the signal strength measurement comprises computing a weighted signal strength measurement, the weighting giving emphasis to lower signal strength measurements of fading radio frequency signals,

wherein the wireless spread spectrum communication device cycles between a power saving state and an active state over predetermined time intervals, and

wherein the wireless spread spectrum communication device returns to the power saving state from the active state if the wireless spread spectrum communication device receives no transmission directed to the wireless spread spectrum communication device while in the active state for a predetermined time interval.

75. The one or more circuits of claim 74 further comprising signal strength measurement circuitry operatively coupled to receiver circuitry, the signal measurement circuitry producing an indication of signal strength of a received radio frequency signal, the indication of signal strength available for use by the at least one processor.

76. The one or more circuits of claim 74 wherein the wireless spread spectrum communication device performs frequency hopping.

77. The one or more circuits of claim 74 wherein the wireless spread spectrum communication device performs direct sequence spread spectrum communication.

78. The one or more circuits of claim 74 wherein evaluating operating conditions of the radio frequency network comprises evaluating an error rate.

79. The one or more circuits of claim 78 wherein evaluating an error rate comprises evaluating at least one of a bit error rate (BER), a message error rate, a frame error rate, a rate of receipt of a negative acknowledgement, a rate of failure to receive a positive acknowledgement, a rate of failure to receive a response to a transmission, and a timeout of a communications protocol timer.

80. The one or more circuits of claim 74 wherein evaluating operating conditions of the radio frequency network is performed during reception of one or more messages.

81. The one or more circuits of claim 80 wherein at least a portion of the one or more messages is received on a substantially regular period.

82. The one or more circuits of claim 80 wherein at least a portion of the one or more messages comprise a test signal.

83. The one or more circuits of claim 80 wherein at least a portion of the one or more messages comprise a polling message.

84. The one or more circuits of claim 80 wherein at least a portion of the one or more messages is received at the second data rate to evaluate whether operation of the radio frequency network at the second data rate is sustainable.

85. The one or more circuits of claim 80 wherein each of the one or more messages has an associated type, and wherein messages of a predetermined type are always received at the first data rate.

86. The one or more circuits of claim 74 wherein a receiver and a transmitter operate on the same radio frequency.

87. The one or more circuits of claim 74 wherein the wireless spread spectrum communication device employs a length-adjustable spreading code.

88. The one or more circuits of claim 74 wherein the wireless spread spectrum communication device employs an adjustable frequency hopping rate.