System and method for medium access control in a power-save network

• US 7,324,468 B2
• Filed: 02/02/2004
• Issued: 01/29/2008
• Est. Priority Date: 09/10/2003
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Fischer, Matthew J.
• Primary Examiner(s): Vuong; Quochien B.
• Application Number:
  US10/770,171
• Publication Number:
  US 20050170868A1
• Time in Patent Office: 1,457 Days
• Field of Search: 370/311, 370/328, 370/331, 370/338, 370/431, 370/445, 370/447, 370/912, 370/913, 455/343.1, 455/343.2, 455/343.3, 455/574, 455/412.1, 455/412.2, 455/413, 455/414.1, 455/436, 455/450, 455/455
• US Class Current: 370/311
• CPC Class Codes: H04L 12/12 Arrangements for remote connection or disconnection of substations or of equipment thereof
• CPC Class Codes: H04L 12/413 with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate
• CPC Class Codes: Y02D 30/70 in wireless communication networks
• CPC Class Codes: Y10S 370/912 Packet communications

Abstract

A method and apparatus for accessing, controlling and utilizing a network communication medium. Various aspects of the present invention may comprise a first networked device with power-save capability. The first networked device may acquire control of a communication medium utilizing a medium access protocol, which may be contention-based. The first networked device may utilize the communication medium to communicate information to a second networked device. The first networked device may transfer control of the communication medium to the second networked device, whereby the second networked device may control the communication medium without having to acquire control of the communication medium by utilizing the medium access protocol. The second networked device may utilize the communication medium to communicate information to the first networked device while maintaining control over the communication medium. The second networked device may have buffered such information for delayed delivery to the first networked device.

Claims

1. In a networked device having the capability to enter and exit a sleep state of a power-saving mode, a method for controlling access to a communication medium, the method comprising:

exiting the sleep state of the power-saving mode;

acquiring control of the communication medium utilizing a contention-based medium access protocol; and

passing control of the communication medium to a second networked device, whereby the second networked device may communicate a plurality of information packets to the networked device without having to utilize the contention-based medium access protocol to access the communication medium.

2. The method of claim 1, further comprising, prior to passing control of the communication medium to the second networked device, communicating data to the second networked device.

3. The method of claim 1, wherein passing control of the communication medium to the second networked device comprises communicating a message to the second networked device indicating that the networked device is capable of power-save operation.

4. The method of claim 1, wherein passing control of the communication medium to the second networked device comprises communicating a message to the second networked device indicating that the networked device has no data to communicate to the second networked device.

5. The method of claim 1, further comprising, after passing control of the communication medium to the second networked device, receiving a plurality of information packets from the second networked device transmitted over the communication medium while the second networked device maintains control over the communication medium.

6. The method of claim 1, further comprising, after passing control of the communication medium to the second networked device:

receiving an indication from the second networked device that the second networked device has no data to communicate to the networked device; and

entering a sleep state of a power-save mode.

7. The method of claim 1, wherein the networked device is directly communicatively coupled to the second networked device over the communication medium.

8. The method of claim 1, wherein passing control of the communication medium to a second networked device, whereby the second networked device may communicate a plurality of information packets to the networked device without having to utilize the contention-based medium access protocol to access the communication medium comprises passing control of the communication medium to the second networked device, whereby the second networked device may communicate a plurality of information packets to the networked device through the communication medium without having to utilize the contention-based medium access protocol to access the communication medium.

9. The method of claim 1, further comprising after passing control of the communication medium to the second networked device, receiving the plurality of information packets from the second networked device.

10. The method of claim 9, wherein receiving the plurality of information packets from the second networked device comprises receiving the plurality of information packets from the second networked device over the communication medium.

11. The method of claim 1, further comprising after passing control of the communication medium to the second networked device, receiving the plurality of information packets from the second networked device, the plurality of information packets having been communicated over the communication medium.

12. The method of claim 11, wherein receiving the plurality of information packets from the second networked device, the plurality of information packets having been communicated over the communication medium, comprises receiving the plurality of information packets from the second networked device over the communication medium.

13. The method of claim 1, wherein the second networked device is a communication networked infrastructure device.

14. The method of claim 13, wherein the second networked device is a communication network access point device.

15. A communication module for utilization in a networked device, the networked device having the capability to enter and exit a sleep state of a power-save mode, the communication module comprising:

a transceiver module;

a power-save module that controls the networked device entering and exiting a power-save mode; and

a medium access control (MAC) module communicatively coupled to the transceiver module and the power-save module, the medium access control module comprising;

a first module that, after the power-save module causes the networked device to exit the sleep state of the power-save mode, utilizes the transceiver module to acquire control of a network communication medium utilizing a contention-based medium access protocol; and

a second module that utilizes the transceiver module to transfer control of the communication medium to a second networked device, whereby the second networked device may communicate a plurality of information packets to the networked device over the communication medium without having to utilize the contention-based medium access protocol to access the communication medium.

16. The communication module of claim 15, further comprising a data communication module communicatively coupled to the transceiver module and the MAC module, wherein the data communication module, prior to the second module transferring control of the communication medium to the second networked device, utilizes the transceiver module to communicate information to the second networked device.

17. The communication module of claim 15, wherein the second module transfers control of the communication medium to the second networked device by utilizing the transceiver module to communicate a message to the second networked device indicating that the networked device has no data to communicate to the second networked device.

18. The communication module of claim 15, further comprising a data communication module communicatively coupled to the transceiver module and the MAC module, wherein the data communication module, after the second module transfers control of the communication medium to the second networked device, utilizes the transceiver module to receive a plurality of information packets from the second networked device that is communicated over the communication medium while the second networked device maintains control over the communication medium.

19. The communication module of claim 15, further comprising a data communication module communicatively coupled to the transceiver module and the MAC module, wherein the power-save module, after the data communication module receives an indication that the second networked device has no data to communicate to the networked device, causes the networked device to enter a sleep state of a power-save mode.

20. The communication module of claim 15, wherein the transceiver module, power-save module, and MAC module are integrated in a single integrated circuit.

21. The method of claim 15, wherein the networked device is directly communicatively coupled to the second networked device over the communication medium.

22. The method of claim 15, wherein the second networked device is a communication network infrastructure device.

23. The method of claim 22, wherein the second networked device is a communication network access point device.

24. In a networked device having the capability to communicate with a second networked device over a communication medium, the second networked device having gained control over the communication medium by utilizing a contention-based medium access protocol after exiting from a sleep state of a power-save mode, a method for controlling access to a communication medium, the method comprising:

receiving a message from the second networked device that passes control of the communication medium to the networked device, whereby the networked device may communicate a plurality of information packets to the second networked device without having to utilize the contention-based medium access protocol to access the communication medium; and

communicating information to the second networked device while maintaining control over the communication medium.

25. The method of claim 24, wherein communicating information to the second networked device comprises communicating a plurality of information packets to the second networked device while maintaining control over the communication medium.

26. The method of claim 24, further comprising determining if the second networked device is a device having the capability to enter and exit a sleep state of a power-save mode.

27. The method of claim 26, wherein the networked device does not perform the step of communicating information to the second networked device while maintaining control over the communication medium if the networked device determines that the second networked device is not a device having the capability to enter and exit a sleep state of a power-save mode.

28. The method of claim 24, wherein the message from the second networked device that passes control of the communication medium to the networked device comprises data information and control information.

29. The method of claim 24, wherein the networked device is directly communicatively coupled to the second networked device over the communication medium.

30. The method of claim 24, wherein the networked device is a communication network infrastructure device.

31. The method of claim 30, wherein the networked device is a communication network access point device.

32. A communication module for utilization in a networked device having the capability to communicate with a second networked device over a communication medium, the second networked device having gained control of the communication medium utilizing a contention-based medium access protocol after exiting from a sleep state of a power-save mode, the communication module comprising:

a transceiver module;

a medium access control (MAC) module communicatively coupled to the transceiver module, wherein the MAC module utilizes the transceiver module to receive a medium control passing message from the second networked device, after which the MAC module may take control of the communication medium for communicating a plurality of information packets to the second networked device without utilizing the contention-based medium access protocol; and

a data communication module communicatively coupled to the transceiver module and the MAC module that utilizes the transceiver module to communicate information to the second networked device while maintaining control of the communication medium.

33. The communication module of claim 32, wherein the data communication module utilizes the transceiver module to communicate information to the second networked device in a plurality of data packets while maintaining control of the communication medium.

34. The communication module of claim 32, wherein the MAC module comprises a first module that determines if the second networked device is a power-save device.

35. The communication module of claim 34, further comprising a database module coupled to the MAC module that comprises a list of network devices having power-save capability, wherein the MAC module accesses the database module to determine if the second networked device is a power-save device.

36. The communication module of claim 34, wherein the data communication module does not utilize the transceiver module to communicate information to the second networked device while maintaining control of the communication medium if the first module determines that the second networked device is not a power-save device.

37. The communication module of claim 32, wherein the medium control passing message from the second networked device comprises data information and control information.

38. The communication module of claim 32, wherein the transceiver module, MAC module and data communication module are all integrated in a single integrated circuit.

39. The method of claim 32, wherein the networked device is directly communicatively coupled to the second networked device over the communication medium.

40. The method of claim 32, wherein the networked device is a communication network infrastructure device.

41. The method of claim 40, wherein the networked device is a communication network access point device.

42. A method for controlling access to a communication medium in a communication network, the method comprising:

exiting a sleep state of a power-save mode by a first networked device;

acquiring control of the communication medium by the first networked device utilizing a contention-based medium access protocol; and

passing control of the communication medium from the first networked device to a second networked device, whereby the second networked device may communicate a plurality of information packets to the first networked device over the communication medium without having to utilize the contention-based medium access protocol to access the communication medium.

43. The method of claim 42, wherein passing control of the communication medium comprises verifying at the second networked device that the first networked device is a device capable of power-save operation.

44. The method of claim 42, further comprising releasing control of the communication medium by the second networked device, such that subsequent access of the communication medium is governed by the contention-based medium access protocol.

45. The method of claim 42, wherein passing control of the communication medium comprises communicating a message from the first networked device to the second networked device over the communication medium, the message containing data and control information.

46. The method of claim 42, further comprising, after passing control of the communication medium to the second networked device, communicating a plurality of data packets from the second networked device to the first networked device while the second networked device retains control over the communication medium.

47. The method of claim 42, wherein the first networked device is directly communicatively coupled to the second networked device over the communication medium.

48. The method of claim 42, wherein the second networked device is a communication network infrastructure device.

49. The method of claim 48, wherein the second networked device is a communication network access point device.