Active idle communication system

• US 8,984,304 B2
• Filed: 11/12/2008
• Issued: 03/17/2015
• Est. Priority Date: 11/12/2007
• Status: Active Grant

• Current Assignee: Marvell Asia Pte Limited (Marvell Technology Group Limited)
• Original Assignee: Marvell International Limited (Marvell Technology Group Limited)
• Inventors: Zimmerman, George A.
• Primary Examiner(s): Huynh, Kim
• Assistant Examiner(s): YEN, PAUL JUEI-FU
• Application Number:
  US12/291,725
• Publication Number:
  US 20090125735A1
• Time in Patent Office: 2,316 Days
• Field of Search: 713/300, 713/1, 713/2, 713/100, 713/310, 713/320, 713/321, 713/322, 713/323, 713/324, 713/330, 713/340, 713/375
• US Class Current: 713/300
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: G06F 1/325 Power saving in peripheral device
• CPC Class Codes: H04W 52/0225 using monitoring of external events, e.g. the presence of a signal
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: Y02B 70/30 Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

To reduce power consumption and heat generation, an active idle system is proposed that monitors for an idle period and then, after a predetermined time, initiates a silent period. During the silent period data and idle frames are not transmitted. During the silent period, one or more transceiver components may be turned off or forced into some other power saving mode. The predetermined time may be any amount of time and is selected to balance network usage and power savings. Periodically during the silent period, such as at predetermined times, one or more sync or idle frames are transmitted. Received sync or idle frames are processed to maintain receiver settings, synchronization or equalizer adaptation. Restoring active data communication may occur by monitoring the channel during silent periods for a request or only during the predetermined times when sync or idle frames are sent.

Claims

1. A method for reducing power consumption in an Ethernet communication device, the method comprising:

establishing a first connection between the Ethernet communication device and an opposing transceiver;

while the Ethernet communication device is not in a reduced power consumption state, monitoring for idle frames from the opposing transceiver;

upon detecting a predetermined number of idle frames,

i) entering the Ethernet communication device into the reduced power consumption state, wherein idle frames are not processed to adapt the Ethernet communication device while the Ethernet communication device is in the reduced power consumption state, and wherein the predetermined number of idle frames detected is greater than one, and

ii) while the Ethernet communication device is in the reduced power consumption state, monitoring for a beginning of a transmit period;

responsive to the beginning of the transmit period,

i) exiting the Ethernet communication device from the reduced power consumption state and receiving one or more idle frames or one or more training frames from the opposing transceiver, and

ii) based on processing at least one of the one or more idle frames or the one or more training frames, maintaining the first connection by selectively adapting at least one of equalizer coefficients of the Ethernet communication device based on existing equalizer coefficients for the first connection, echo canceler coefficients of the Ethernet communication device based on existing echo canceler coefficients for the first connection, or crosstalk canceler coefficients of the Ethernet communication device based on existing crosstalk canceler coefficients for the first connection; and

responsive to an ending of the transmit period, re-entering the Ethernet communication device into the reduced power consumption state.

2. The method of claim 1, wherein detecting the predetermined number of idle frames comprises detecting a predetermined number of consecutive idle frames.

3. The method of claim 1, wherein monitoring for the beginning of the transmit period comprises receiving a timer output, wherein the timer output signals the beginning of the transmit period.

4. The method of claim 1, wherein the selectively adapting comprises:

analyzing the at least one of the one or more idle or training frames to determine channel conditions;

performing a comparison of the channel conditions with prior channel conditions; and

in response to the comparison revealing a change in channel conditions that is greater than a predetermined threshold, adjusting the equalizer coefficients, the echo canceler coefficients, or the crosstalk canceler coefficients.

5. The method of claim 1, further comprising:

during one of the reduced power consumption state or the transmit period, receiving an activate frame from the opposing transceiver, and

restoring data communication in response to receipt of the activate frame.

6. The method of claim 1, wherein entering the Ethernet communication device into the reduced power consumption state comprises disabling clock signals to a crosstalk canceler of the Ethernet communication device and an echo canceler of the Ethernet communication device while maintaining a timing circuit of the Ethernet communication device in an active state.

7. A method for maintaining a communication link during periods of non-use of a communication system, the method comprising:

establishing the communication link between a transmitter and an opposing receiver;

detecting a beginning of an idle period in the communication system, wherein during the idle period, the transmitter sends only idle frames to the opposing receiver;

responsive to the beginning of the idle period, initiating a counter or timer to start a first time period;

during the idle period, monitoring for an end of the first time period;

during the idle period and responsive to the end of the first time period,

stopping the sending of the idle frames by the transmitter, and

initiating the counter or timer to start a second time period;

monitoring for an end of the second time period;

responsive to the end of the second time period, sending a sync frame or an idle frame from the transmitter to the opposing receiver; and

receiving and processing the sync frame or the idle frame at the opposing receiver to maintain the communication link by selectively adapting at least one of (i) equalizer coefficients of the opposing receiver based on existing equalizer coefficients for the communication link, (ii) echo canceler coefficients of the opposing receiver based on existing echo canceler coefficients for the communication link, or (iii) crosstalk canceler coefficients of the opposing receiver based on existing crosstalk canceler coefficients for the communication link.

8. The method of claim 7, wherein stopping the sending of idle frames comprises sending no signal from the transmitter.

9. The method of claim 7, further comprising, in response to sending the sync frame or the idle frame from the transmitter to the opposing receiver, resetting the counter or timer to restart the second time period.

10. The method of claim 7, wherein receiving and processing the sync or the idle frame at the opposing receiver to maintain one or more settings of the opposing receiver comprises, at the opposing receiver, performing timing synchronization, adaptation, or both.

11. The method of claim 7, wherein stopping the sending of idle frames further comprises powering down one or more aspects of the transmitter.

12. The method of claim 7, further comprising, responsive to the end of the first time period, entering the opposing receiver into a reduced power consumption state, including disabling clock signals to a crosstalk canceler of the opposing receiver and an echo canceler of the opposing receiver while maintaining a timing circuit of the opposing receiver in an active state.

13. A system for saving power in a communication device, the system comprising:

an input/output port configured to connect to a channel;

a receiver;

a transmitter configured to transmit data to the receiver over the channel via the input/output port; and

a controller configured to interface with the transmitter, wherein the controller is further configured to

establish a first connection between the transmitter and an opposing transceiver;

detect idle periods during which data is not sent over the channel;

in response to one of the idle periods exceeding a predetermined idle period, control the transmitter to initiate a silent period by no longer sending a signal over the channel;

during the silent period, reactivate the transmitter periodically to send sync information or idle information; and

reactivate the transmitter in response to active data to be transmitted,

wherein the receiver is configured to receive and process the sync information or idle information to maintain the first connection by selectively adapting at least one of (i) equalizer coefficients of the receiver based on existing equalizer coefficients for the first connection, (ii) echo canceler coefficients of the receiver based on existing echo canceler coefficients for the first connection, or (iii) crosstalk canceler coefficients of the receiver based on existing crosstalk canceler coefficients for the first connection.

14. The system of claim 13, wherein the controller comprises a timer configured to time the idle periods.

15. The system of claim 13, further comprising a memory configured to store information regarding the predetermined idle period.

16. The system of claim 13, further comprising a clocking system generating a clock signal, wherein during the silent period the clock signal is not provided to two or more apparatus of the transmitter.

17. The system of claim 13, wherein during the silent period, the controller is configured to turn off one or more aspects of the transmitter.

18. The system of claim 13, wherein the receiver is configured to, during the silent period, enter a reduced power consumption state, including disabling clock signals to a crosstalk canceler of the receiver and an echo canceler of the receiver while maintaining a timing circuit of the receiver in an active state.

19. The system of claim 17, wherein during the silent period, one or more aspects of the receiver are also turned off.