Method and system for reducing transceiver power via a variable signal constellation

• US 8,218,567 B2
• Filed: 09/21/2007
• Issued: 07/10/2012
• Est. Priority Date: 03/12/2007
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Powell, Scott
• Primary Examiner(s): Kizou, Hassan
• Assistant Examiner(s): NGUYEN, TOAN D
• Application Number:
  US11/859,429
• Publication Number:
  US 20080225881A1
• Time in Patent Office: 1,754 Days
• Field of Search: 370/252, 370/352, 370/401, 370/463, 370/465, 370/538, 370/522, 370/254, 370/445, 375/222, 375/286, 375/259, 375/261, 375/271, 375279-281, 375/302, 375/308, 375/260, 714/796
• US Class Current: 370/463
• CPC Class Codes: H04L 12/40039 Details regarding the setting of the power status of a node according to activity on the bus
• CPC Class Codes: H04L 12/40136 Nodes adapting their rate to the physical link properties LAN switches H04L49/351
• CPC Class Codes: H04L 12/413 with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

Aspects of a method and system for reducing transceiver power via a variable signal constellation are provided. In this regard, an Ethernet PHY device may receive one or more signals indicative of a current state of an Ethernet link to which the PHY device is coupled and/or indicative of resources, such as power, available to the PHY device. Accordingly, a number of points comprising a signal constellation utilized to communicate data via the Ethernet link may vary based on the one or more signals. A current state of the link may comprise a bit error rate, a packet error rate, and/or utilization, in terms of bandwidth for example, of the link. Aspects of the invention may enable controlling, at least in part, power consumption of the PHY device may altering the number of points comprising the signal constellation.

Claims

1. A method, the method comprising:

performing using one or more circuits and/or processors in an Ethernet-over-twisted-pair PHY, said Ethernet-over-twisted-pair PHY being coupled to a link partner via a plurality of twisted pairs;

determining, based on one or more signals, one or both of;

a current state of a link between said Ethernet-over-twisted-pair PHY and said link partner; and

resources available to said Ethernet-over-twisted-pair PHY; and

varying a number of constellation points utilized by said Ethernet-over-twisted-pair PHY for communicating over said plurality of twisted-pairs based on said determination, wherein;

said number of constellation points is varied while continuing to communicate over each of said plurality of twisted pairs; and

said number of constellation points is varied while a symbol rate at which said Ethernet-over-twisted-pair PHY remains unchanged.

2. The method according to claim 1, wherein said resources available to said Ethernet-over-twisted-pair PHY comprise power.

3. The method according to claim 1, wherein said current state of said link between said Ethernet-over-twisted-pair PHY and said link partner comprises a bit error rate, a packet error rate and/or a utilization of said link.

4. The method according to claim 1, comprising controlling power consumption of said Ethernet-over-twisted-pair PHY via said variation in said number of constellation points utilized by said Ethernet-over-twisted-pair PHY.

5. The method according to claim 4, wherein said controlling of said power consumption results in minimizing of power consumed by said Ethernet-over-twisted-pair PHY.

6. The method according to claim 1, comprising mapping data to be transmitted by said Ethernet Ethernet-over-twisted-pair PHY to varying voltage levels based on said variation in said number of constellation points.

7. The method according to claim 1, comprising maintaining a specified bit error rate via said variation in said number of constellation points.

8. The method according to claim 1, comprising maintaining a specified packet error rate via said variation in said number of constellation points.

9. The method according to claim 1, comprising modifying said number of constellation points utilized by said Ethernet-over-twisted-pair PHY based on a threshold associated with on one or more of a bit error rate, a packet error rate, link utilization, and power available to said Ethernet-over-twisted-pair PHY.

10. The method according to claim 1, wherein said Ethernet-over-twisted-pair PHY communicates at data rates greater than or equal to 1 Gigabit per second.

11. A non-transitory machine-readable storage having stored thereon, a computer program having at least one code section for providing communication in a network, the at least one code section being executable by a machine for causing the machine to perform steps comprising:

in an Ethernet-over-twisted-pair PHY coupled to a link partner via a plurality of twisted pairs;

determining, based on one or more signals, one or both of

a current state of a link between said Ethernet-over-twisted-pair PHY and said link partner; and

resources available to said Ethernet-over-twisted-pair PHY; and

varying a number of constellation points utilized by said Ethernet-over-twisted-pair PHY for communicating over said plurality of twisted-pairs based on said determination, wherein;

said number of constellation points is varied while continuing to communicate over each of said plurality of twisted pairs; and

said number of constellation points is varied while a symbol rate at which said Ethernet-over-twisted-pair PHY remains unchanged.

12. The non-transitory machine-readable storage according to claim 11, wherein said resources available to said Ethernet-over-twisted-pair PHY comprise power.

13. The non-transitory machine-readable storage according to claim 11, wherein said current state of said link between said Ethernet-over-twisted-pair PHY and said link partner comprises a hit error rate, a packet error rate and/or utilization of said link.

14. The non-transitory machine-readable storage according to claim 11, wherein said at least one code section comprises code for controlling power consumption of said Ethernet-over-twisted-pair PHY via said variation in said number of constellation points utilized by said Ethernet-over-twisted-pair PHY.

15. The non-transitory machine-readable storage according to claim 14, wherein said controlling of said power consumption causes minimizing of power consumed by said Ethernet-over-twisted-pair PHY.

16. The non-transitory machine-readable storage according to claim 11, wherein said at least one code section comprises code for mapping data to be transmitted by said Ethernet-over-twisted-pair PHY to varying voltage levels based on said variation in said number of constellation points.

17. The non-transitory machine-readable storage according to claim 11, wherein said at least one code section comprises code for maintaining a specified bit error rate via said variation in said number of constellation points.

18. The non-transitory machine-readable storage according to claim 11, wherein said at least one code section comprises code for maintaining a specified packet error rate via said variation in said number of constellation points.

19. The non-transitory machine-readable storage according to claim 11, wherein said at least one code section comprises code for modifying said number of constellation points utilized by said Ethernet-over-twisted-pair PHY based on a threshold associated with on one or more of a bit error rate, a packet error rate, link utilization, and power available to said Ethernet-over-twisted-pair PHY.

20. The non-transitory machine-readable storage according to claim 11, wherein said Ethernet-over-twisted-pair PHY communicates at data rates greater than or equal to 1 Gigabit per second.

21. A system for providing communication in a network, the system comprising:

one or more circuits and/or processors of an Ethernet-over-twisted-pair PHY, said Ethernet-over-twisted-pair PHY being coupled to a link partner via a plurality of twisted pairs, and said one or more circuits being operable to;

determine, based on one or more signals, one or both of;

a current state of a link between said Ethernet-over-twisted-pair PHY and said link partner; and

resources available to said Ethernet-over-twisted-pair PHY; and

vary a number of constellation points utilized by said Ethernet-over-twisted-pair PHY for communicating over said plurality of twisted-pairs based on said determination, wherein;

said number of constellation points is varied while continuing to communicate over each of said plurality of twisted pairs; and

said number of constellation points is varied while a symbol rate at which said Ethernet-over-twisted-pair PHY remains unchanged.

22. The system according to claim 21, wherein said resources available to said Ethernet-over-twisted-pair PHY comprise power.

23. The system according to claim 21, wherein said current state of said at least said link between said Ethernet-over-twisted-pair PHY and said link partner comprises a bit error rate, a packet error rate and/or utilization of said link.

24. The system according to claim 21, wherein said one or more circuits and/or processors are operable to control power consumption of said Ethernet-over-twisted-pair PHY via said variation in said number of constellation points utilized by said Ethernet-over-twisted-pair PHY.

25. The system according to claim 24, wherein said controlling of said power consumption results in minimizing of power consumed by said Ethernet-over-twisted-pair PHY.

26. The system according to claim 21, wherein said one or more circuits and/or processors are operable to map data to be transmitted by said Ethernet-over-twisted-pair PHY to varying voltage levels based on variation in said variation in said number of constellation points.

27. The system according to claim 21, wherein said one or more circuits and/or processors are operable to maintain a specified bit error rate via said variation in said number of constellation points.

28. The system according to claim 21, wherein said one or more circuits and/or processors are operable to maintain a specified packet error rate via said variation in said number of constellation points.

29. The system according to claim 21, wherein said one or more circuits and/or processors are operable to modify said number of constellation points utilized by said Ethernet-over-twisted-pair PHY based a threshold associated with on one or more of a bit error rate, a packet error rate, link utilization, and power available to said Ethernet-over-twisted-pair PHY.

30. The system according to claim 21, wherein said Ethernet-over-twisted-pair PHY communicates at data rates greater than or equal to 1 Gigabit per second.