Deep sleep mode for WLAN communication systems

• US 20050190709A1
• Filed: 08/24/2004
• Published: 09/01/2005
• Est. Priority Date: 02/27/2004
• Status: Active Grant

• Current Assignee: Globalfoundries US Incorporated (GlobalFoundries, Inc.)
• Original Assignee: Advanced Micro Devices, Inc.
• Inventors: Ferchland, Tilo, Flemming, Ralf, Wiencke, Christian
• Granted Patent: US 7,561,541 B2
• Time in Patent Office: Days
• US Class Current: 370/311
• CPC Class Codes: H04W 52/0287 changing the clock frequency of a controller in the equipment
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A WLAN (Wireless Local Area Network) communication device for performing communication in a WLAN network is provided that comprises a physical connection unit, a physical connection oscillator, and a control unit. The physical connection unit is for providing a physical connection of the WLAN communication device to a wireless communication medium. The physical connection oscillator is for providing a physical connection clock signal to the physical connection unit. The control unit is for controlling operation of the physical connection oscillator. The WLAN communication device is operable in a communication mode and in a deep sleep mode. The control unit is adapted to deactivate the physical connection oscillator when the deep sleep mode is entered. Embodiments may provide an extended reduction of the power consumption of the WLAN communication device.

Claims

1. A WLAN (Wireless Local Area Network) communication device for performing communication in a WLAN network, the WLAN communication device comprising:

a physical connection unit for providing a physical connection of the WLAN communication device to a wireless communication medium;

a physical connection oscillator connected to the physical connection unit for providing a physical connection clock signal to the physical connection unit; and

a control unit connected to the physical connection oscillator for controlling operation of the physical connection oscillator;

wherein the WLAN communication device is operable in a communication mode for transmitting and/or receiving data packets and in a first standby mode; and

wherein the control unit is adapted to deactivate the physical connection oscillator when the WLAN communication device enters the first standby mode.

2. The WLAN communication device of claim 1, further comprising a MAC (Medium Access Control) unit for managing communication in the WLAN network by coordinating access to the wireless communication medium.

3. The WLAN communication device of claim 2, wherein the MAC unit is connected to the control unit for requesting a transition of the WLAN communication device into the first standby mode by sending a first standby request signal to the control unit.

4. The WLAN communication device of claim 3, wherein the control unit is adapted to receive the first standby request signal from the MAC unit and send a request confirmation signal to the MAC unit if the first standby request signal has been received.

5. The WLAN communication device of claim 2, wherein the control unit is connected to the MAC unit for activating and/or deactivating the MAC unit by sending to the MAC unit an activate signal or deactivate signal, respectively.

6. The WLAN communication device of claim 5, wherein the control unit is adapted to deactivate and/or activate the MAC unit when the WLAN communication device enters or abandons the first standby mode, respectively.

7. The WLAN communication device of claim 6, wherein the MAC unit is adapted to be activated upon receiving the activate signal from the control unit and to send an activation confirmation signal to the control unit if the MAC unit has been successfully activated.

8. The WLAN communication device of claim 2, wherein the MAC unit is connected to the control unit for scheduling a duration of the first standby mode by sending a first standby duration signal to the control unit.

9. The WLAN communication device of claim 2, further comprising a BBP (Base Band Processor) unit for converting communication signals interchangeable over the wireless communication medium into digital data packets processable by the MAC unit and/or vice versa.

10. The WLAN communication device of claim 9, wherein the physical connection unit and the BBP unit are connected for exchanging the communication signals.

11. The WLAN communication device of claim 9, wherein the BBP unit is connected to the MAC unit for exchanging the digital data packets.

12. The WLAN communication device of claim 9, further comprising an integrated baseband medium access unit and wherein the MAC unit and the BBP unit are comprised within the integrated baseband medium access unit.

13. The WLAN communication device of claim 12, wherein the control unit is comprised within the integrated baseband medium access unit.

14. The WLAN communication device of claim 1, wherein the physical connection unit comprises a frequency divider for generating a main clock signal by dividing the frequency of the physical connection clock signal.

15. The WLAN communication device of claim 14, wherein the physical connection unit is connected to the control unit for providing the main clock signal to the control unit.

16. The WLAN communication device of claim 14, further comprising a MAC (Medium Access Control) unit for managing communication in the WLAN network by coordinating access to the wireless communication medium, and wherein the physical connection unit is connected to the MAC unit for providing the main clock signal to the MAC unit.

17. The WLAN communication device of claim 14, further comprising:

a MAC (Medium Access Control) unit for managing communication in the WLAN network by coordinating access to the wireless communication medium; and

a BBP (Base Band Processor) unit for converting communication signals interchangeable over the wireless communication medium into digital data packets processable by the MAC unit and/or vice versa;

wherein the physical connection unit is connected to the BBP unit for providing the main clock signal to the BBP unit.

18. The WLAN communication device of claim 1, wherein the control unit is adapted to deactivate and/or activate the physical connection oscillator by sending to the physical connection oscillator a deactivate signal or activate signal when the WLAN communication device enters or abandons the first standby mode, respectively.

19. The WLAN communication device of claim 1, further comprising at least one internal oscillator in addition to the physical connection oscillator for providing a clock signal to at least one component of the WLAN communication device.

20. The WLAN communication device of claim 19, wherein the control unit is connected to the at least one internal oscillator for deactivating and/or activating the at least one internal oscillator by sending a deactivate signal or activate signal to the at least one internal oscillator when the WLAN communication device enters or abandons the first standby mode, respectively.

21. The WLAN communication device of claim 1, adapted to be installed on a host computer system comprising a CPU (Central Processing Unit) for providing WLAN communication functionality to the host computer system.

22. The WLAN communication device of claim 21, wherein the CPU is connected to the control unit for making the WLAN communication device abandon the first standby mode by sending a first standby abandon signal to the control unit.

23. The WLAN communication device of claim 21, further comprising a MAC (Medium Access Control) unit for managing communication in the WLAN network by coordinating access to the wireless communication medium and wherein the MAC unit is connected to the CPU for exchanging digital data packets.

24. The WLAN communication device of claim 1, adapted to receive at least one first standby clock signal from at least one first standby clock oscillator while the WLAN communication device is in the first standby mode.

25. The WLAN communication device of claim 24, wherein the control unit is connected to the at least one first standby clock oscillator for receiving the at least one first standby clock signal.

26. The WLAN communication device of claim 24, further adapted to determine before entering the first standby mode whether the at least one first standby clock signal is available to the WLAN communication device.

27. The WLAN communication device of claim 24, further adapted to determine before entering the first standby mode whether more than one first standby clock signal is available to the WLAN communication device.

28. The WLAN communication device of claim 27, further adapted to determine before entering the first standby mode a preferred first standby clock signal if more than one first standby clock signal is available to the WLAN communication device.

29. The WLAN communication device of claim 24, further adapted to receive the at least one first standby clock signal from an analog first standby clock oscillator.

30. The WLAN communication device of claim 24, further adapted to receive the at least one first standby clock signal from a digital first standby clock oscillator.

31. The WLAN communication device of claim 24, further adapted to be installed on a host computer system for providing WLAN communication functionality to the host computer system and to receive the at least one first standby clock signal from at least one first standby clock oscillator within the host computer system.

32. The WLAN communication device of claim 1, wherein the control unit comprises a counting unit for counting the number of time intervals of a predetermined length that have been elapsed since the WLAN communication device has entered the first standby mode.

33. The WLAN communication device of claim 32, wherein the control unit further comprises a timing control unit connected to the counting unit for making the counting unit start and/or stop counting by sending a counting start signal or counting stop signal to the counting unit, respectively.

34. The WLAN communication device of claim 33, wherein the control unit further comprises a multiplexer for forwarding a main clock signal from the physical connection unit or a first standby clock signal from at least one first standby clock oscillator to the counting unit and the timing control unit while the WLAN communication device is in the first standby mode.

35. The WLAN communication device of claim 34, wherein the counting unit is adapted to count the number of time intervals based on the main clock signal or the first standby clock signal received from the multiplexer.

36. The WLAN communication device of claim 34, further comprising at least one frequency divider for reducing the frequency of the at least one first standby clock signal and/or the frequency of the main clock signal before providing the at least one first standby clock signal and/or the main clock signal to the counting unit and the timing control unit.

37. The WLAN communication device of claim 34, further comprising at least one frequency divider for reducing the frequency of the at least one first standby clock signal and/or the frequency of the main clock signal before providing the at least one first standby clock signal and/or the main clock signal to the multiplexer.

38. The WLAN communication device of claim 34, wherein the timing control unit is adapted to select a clock signal among the main clock signal and the at least one first standby clock signal to be passed trough the multiplexer to the timing control unit and the counting unit.

39. The WLAN communication device of claim 33, wherein the timing control unit is adapted to determine whether the number of time intervals counted by the counting unit corresponds to a scheduled duration of the first standby mode.

40. The WLAN communication device of claim 1, wherein the WLAN communication device is adapted to be installed on a host computer system for providing WLAN communication functionality to the host computer system;

wherein the WLAN communication device is further operable in a second standby mode;

wherein the WLAN communication device is further adapted to disable a data packet exchange link to the host computer system when entering the second standby mode;

wherein the WLAN communication device is further adapted to disable a communication link over the wireless communication medium when entering the second standby mode; and

wherein the physical connection oscillator is active while the WLAN communication device is in the second standby mode.

41. The WLAN communication device of claim 40, further adapted to automatically enter the second standby mode once the WLAN communication device has been activated.

42. The WLAN communication device of claim 1, wherein the WLAN communication device is adapted to be installed on a host computer system for providing WLAN communication functionality to the host computer system;

wherein the WLAN communication device is further operable in a third standby mode;

wherein the WLAN communication device is further adapted to disable a data packet exchange link to the host computer system when entering the third standby mode; and

wherein the WLAN communication device is further adapted to receive a request to enter the communication mode over the wireless communication medium while the WLAN communication device is in the third standby mode.

43. The WLAN communication device of claim 1, adapted to abandon the first standby mode periodically for determining whether a request to enter the communication mode has been received.

44. The WLAN communication device of claim 1, adapted to abandon the first standby mode periodically for receiving a beacon signal indicating the presence of a WLAN communication counterpart within the WLAN network.

45. The WLAN communication device of claim 1, adapted to negotiate a duration of the first standby mode with a WLAN communication counterpart within the WLAN network and to abandon the first standby mode after the negotiated duration.

46. The WLAN communication device of claim 1, adapted to be installed on a host computer system comprising a CPU (Central Processing Unit) for providing WLAN communication functionality to the host computer system, wherein the WLAN communication device is further adapted to negotiate a duration of the first standby mode with the CPU and to abandon the first standby mode after the negotiated duration.

47. The WLAN communication device of claim 1, adapted to be installed on a host computer system comprising a CPU (Central Processing Unit) for providing WLAN communication functionality to the host computer system, wherein the WLAN communication device is further adapted to abandon the first standby mode upon reception of a first standby abandon signal from the CPU.

48. A method of operating a WLAN communication device for performing communication in a WLAN (Wireless Local Area Network) network, comprising:

operating a physical connection unit for providing a physical connection of the WLAN communication device to a wireless communication medium;

operating a physical connection oscillator for providing a physical connection clock signal to the physical connection unit;

operating a control unit for controlling operation of the physical connection oscillator;

operating the WLAN communication device in a communication mode for transmitting and/or receiving data packets and a first standby mode; and

deactivating the physical connection oscillator when the operation of the WLAN communication device enters the first standby mode.

49. The method of claim 48, further comprising requesting a transition of the operation of the WLAN communication device into the first standby mode by sending a first standby request signal to the control unit.

50. The method of claim 49, further comprising acknowledging reception of the first standby request signal by the control unit by returning a request confirmation signal.

51. The method of claim 48, further comprising scheduling a duration of the first standby mode by sending a first standby duration signal to the control unit.

52. The method of claim 48, further comprising operating a MAC (Medium Access Control) unit for managing communication in the WLAN network by coordinating access to the wireless communication medium.

53. The method of claim 52, further comprising activating and/or deactivating the MAC unit by sending to the MAC unit an activate signal or deactivate signal, respectively.

54. The method of claim 53, further comprising deactivating and/or activating the MAC unit when the operation of the WLAN communication device enters or abandons the first standby mode, respectively.

55. The method of claim 53, further comprising acknowledging reception of the activate signal by the MAC unit by returning an activation confirmation signal.

56. The method of claim 52, further comprising operating a BBP (Base Band Processor) unit for converting communication signals interchangeable over the wireless communication medium into digital data packets processable by the MAC unit and/or vice versa.

57. The method of claim 56, further comprising exchanging the digital data packets between the BBP unit and the MAC unit.

58. The method of claim 56, wherein operating the BBP unit further comprises exchanging the communication signals with the physical connection unit.

59. The method of claim 56, further comprising operating an integrated baseband medium access unit including the MAC unit and the BBP unit.

60. The method of claim 59, further comprising operating the integrated baseband medium access unit including the control unit.

61. The method of claim 48, wherein operating the physical connection unit comprises operating a frequency divider for generating a main clock signal by dividing the frequency of the physical connection clock signal.

62. The method of claim 61, wherein operating the physical connection unit further comprises providing the main clock signal to the control unit.

63. The method of claim 61, wherein operating the physical connection unit further comprises providing the main clock signal to a MAC (Medium Access Control) unit for managing communication in the WLAN network by coordinating access to the wireless communication medium.

64. The method of claim 61, wherein operating the physical connection unit further comprises providing the main clock signal to a BBP (Base Band Processor) unit for converting communication signals interchangeable over the wireless communication medium into digital data packets processable by a MAC (Medium Access Control) unit for managing communication in the WLAN network by coordinating access to the wireless communication medium and/or vice versa.

65. The method of claim 48, further comprising deactivating and/or activating the physical connection oscillator by sending to the physical connection oscillator a deactivate signal or activate signal when the operation of the WLAN communication device enters or abandons the first standby mode, respectively.

66. The method of claim 48, further comprising operating at least one internal oscillator within the WLAN communication device in addition to the physical connection oscillator for providing a clock signal to at least one component of the WLAN communication device.

67. The method of claim 66, further comprising deactivating and/or activating the at least one internal oscillator by sending a deactivate signal or activate signal to the at least one internal oscillator when the operation of the WLAN communication device enters or abandons the first standby mode, respectively.

68. The method of claim 48, further comprising operating the WLAN communication device installed on a host computer system comprising a CPU (Central Processing Unit) for providing WLAN communication functionality to the host computer system.

69. The method of claim 68, further comprising sending a first standby abandon signal from the CPU to the control unit for abandoning operating the WLAN communication device in the first standby mode.

70. The method of claim 68, further comprising exchanging digital data packets between the CPU and a MAC (Medium Access Control) unit for managing communication in the WLAN network by coordinating access to the wireless communication medium within the WLAN communication device.

71. The method of claim 48, wherein operating the WLAN communication device in the first standby mode comprises receiving at least one first standby clock signal from at least one first standby clock oscillator.

72. The method of claim 71, wherein operating the WLAN communication device in the first standby mode further comprises receiving the at least one first standby clock signal by the control unit.

73. The method of claim 71, further comprising determining before entering the first standby mode whether the at least one first standby clock signal is available to the WLAN communication device.

74. The method of claim 71, further comprising determining before entering the first standby mode whether more than one first standby clock signal is available to the WLAN communication device.

75. The method of claim 74, further comprising determining before entering the first standby mode a preferred first standby clock signal if more than one first standby clock signal is available to the WLAN communication device.

76. The method of claim 71, wherein operating the WLAN communication device in the first standby mode comprises receiving the at least one first standby clock signal from an analog first standby clock oscillator.

77. The method of claim 71, wherein operating the WLAN communication device in the first standby mode comprises receiving the at least one first standby clock signal from a digital first standby clock oscillator.

78. The method of claim 71, further comprising:

operating the WLAN communication device installed on a host computer system for providing WLAN communication functionality to the host computer system; and

wherein operating the WLAN communication device in the first standby mode comprises receiving the at least one first standby clock signal from a first standby clock oscillator within the host computer system.

79. The method of claim 48, further comprising counting by a counting unit within the control unit the number of time intervals of a predetermined length that have been elapsed since the operation of the WLAN communication device has entered the first standby mode.

80. The method of claim 79, further comprising initiating and/or terminating counting the number of the elapsed time intervals by sending a counting start signal or counting stop signal, respectively, from a timing control unit within the control unit to the counting unit.

81. The method of claim 80, further comprising providing a main clock signal from the physical connection unit or at least one first standby clock signal from at least one first standby clock oscillator over a multiplexer to the counting unit and the timing control unit.

82. The method of claim 81, wherein counting the number of the elapsed time intervals comprises counting the number of the elapsed time intervals based on the main clock signal or based on the at least one first standby clock signal.

83. The method of claim 81, further comprising reducing the frequency of the main clock signal or the at least one first standby signal, respectively, by means of a frequency divider before providing the main clock signal or the first standby signal, respectively, to the counting unit and the timing control unit.

84. The method of claim 81, further comprising reducing the frequency of the main clock signal or the at least one first standby signal, respectively, by means of a frequency divider before providing the main clock signal or the first standby signal, respectively, to the multiplexer.

85. The method of claim 81, further comprising selecting a clock signal among the main clock signal and the at least one first standby clock signal to be passed through the multiplexer to the timing control unit and the counting unit.

86. The method of claim 79, further comprising determining whether the number of time intervals counted by the counting unit corresponds to a scheduled duration of the first standby mode.

87. The method of claim 48, further comprising:

operating the WLAN communication device installed on a host computer system for providing WLAN communication functionality to the host computer system;

operating the WLAN communication device in a second standby mode;

disabling a data packet exchange link between the WLAN communication device and the host computer system when the operation of the WLAN communication device enters the second standby mode;

disabling a communication link of the WLAN communication device over the wireless communication medium when the operation of the WLAN communication device enters the second standby mode; and

actively operating the physical connection oscillator while the WLAN communication device is operated in the second standby mode.

88. The method of claim 87, further comprising automatically entering the operation of the WLAN communication device in the second standby mode once the WLAN communication device has been activated.

89. The method of claim 48, further comprising:

operating the WLAN communication device installed on a host computer system for providing WLAN communication functionality to the host computer system;

operating the WLAN communication device in a third standby mode;

disabling a data packet exchange link between the WLAN communication device and the host computer system when the operation of the WLAN communication device enters the third standby mode; and

receiving by the WLAN communication device a request to enter the communication mode over the wireless communication medium while the WLAN communication device is operated in the third standby mode.

90. The method of claim 48, further comprising abandoning the first standby mode periodically for determining whether a request to enter the communication mode has been received.

91. The method of claim 48, further comprising abandoning the first standby mode periodically for receiving a beacon signal indicating the presence of a WLAN communication counterpart within the WLAN network.

92. The method of claim 48, further comprising:

negotiating a duration of the first standby mode with a communication counterpart within the WLAN network; and

abandoning the first standby mode after the negotiated duration.

93. The method of claim 48, further comprising:

operating the WLAN communication device installed on a host computer system comprising a CPU (Central Processing Unit) for providing WLAN communication functionality to the host computer system;

negotiating a duration of the first standby mode with the CPU; and

abandoning the first standby mode after the negotiated duration.

94. The method of claim 48, further comprising:

operating the WLAN communication device installed on a host computer system comprising a CPU (Central Processing Unit) for providing WLAN communication functionality to the host computer system;

receiving a first standby abandon signal from the CPU; and

abandoning the first standby mode upon reception of the first standby abandon signal.

95. An integrated circuit chip for performing communication in a WLAN network, the integrated circuit chip comprising:

a physical connection circuit for providing a physical connection of the integrated circuit chip to a wireless communication medium;

a physical connection oscillator circuit connected to the physical connection circuit for providing a physical connection clock signal to the physical connection circuit; and

a control circuit connected to the physical connection oscillator circuit for controlling operation of the physical connection oscillator circuit;

wherein the integrated circuit chip is operable in a communication mode for transmitting and/or receiving data packets and in a first standby mode; and

wherein the control circuit is adapted to deactivate the physical connection oscillator circuit when the integrated circuit chip enters the first standby mode.

96. A computer system for performing communication in a WLAN network, the computer system comprising:

a physical connection device for providing a physical connection of the computer system to a wireless communication medium;

a physical connection oscillator connected to the physical connection device for providing a physical connection clock signal to the physical connection device; and

a control device connected to the physical connection oscillator for controlling operation of the physical connection oscillator;

wherein the computer system is operable in a communication mode for transmitting and/or receiving data packets and in a first standby mode; and

wherein the control device is adapted to deactivate the physical connection oscillator when the computer system enters the first standby mode.