Method and System for Server-Side Handling of a Low-Power Client in a Wide Area Network

• US 20140293854A1
• Filed: 03/31/2014
• Published: 10/02/2014
• Est. Priority Date: 10/14/2011
• Status: Active Grant

• Current Assignee: Maxlinear Incorporated
• Original Assignee: Maxlinear Incorporated
• Inventors: Ling, Curtis, Gallagher, Timothy, Ramesh, Sridhar
• Granted Patent: US 9,113,410 B2
• Time in Patent Office: Days
• US Class Current: 370/311
• CPC Class Codes: G06F 1/3209 Monitoring remote activity, e.g. over telephone lines or network connections
• CPC Class Codes: G06F 1/3234 Power saving characterised by the action undertaken
• CPC Class Codes: G06F 1/3278 Power saving in modem or I/O interface
• CPC Class Codes: H04L 12/2801 Broadband local area networks
• CPC Class Codes: H04L 7/0033 Correction by delay
• CPC Class Codes: H04W 52/02 Power saving arrangements in wired systems H04L12/12; signaling of mobile application services, e.g. low battery notifications H04W4/20
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management
• 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

Abstract

A CMTS may receive a request that a network device be permitted to enter a power-saving mode of operation. In response, the CMTS may enter a power-saving mode of operation wherein MAC management messages, transmission opportunities for the sleeping network device, and/or contention periods on one or more channels occur at independently determinable intervals. The CMTS may then transmit a message granting the network device permission to enter the power-saving mode of operation. The CMTS may start a sleep timer upon transmitting the MAC management message and may deregister the network device if no communication is received from the network device prior to expiration of the sleep timer. The CMTs may buffer traffic destined for the network device in a buffer of the CMTS while the network device is in the power-saving mode of operation, and may wake the network device upon the amount of buffered traffic reaching a threshold.

Claims

1. A method comprising:

in a cable modem termination system (CMTS) of a DOCSIS network;

receiving a request that a network device be permitted to enter a power-saving mode of operation;

in response to said request, entering a power-saving mode of operation which comprises transmitting a message granting said network device permission to enter said power-saving mode of operation, wherein said message granting said network device permission to enter said power-saving mode is an MPEG transport stream packet having a first program identifier (PID) that;

is uniquely associated with messages that manage power consumption in the DOCSIS network; and

is different from a second PID used for MPEG transport stream packets that carry DOCSIS messages.

2. The method of claim 1, wherein said network device is a cable modem, cable set-top-box, or cable gateway.

3. The method of claim 4, wherein said MAC management messages comprise MAP and/or upstream channel descriptor (UCD) messages.

4. The method of claim 1, comprising:

while operating in said power-saving mode of operation, starting a sleep timer upon transmitting said a MAC management message.

5. The method of claim 4, comprising deregistering said network device if no communication is received from said network device prior to expiration of said sleep timer.

6. The method of claim 4, comprising determining a value at which said sleep timer expires based on network traffic statistics.

7. The method of claim 1, wherein:

said request is a media access control (MAC) management message; and

contents of a type value field of said request are uniquely associated with requests for permission to enter a power-saving mode of operation.

8. (canceled)

9. A method comprising:

in a host device that centrally manages access of a plurality of DOCSIS client devices to a shared medium comprising one or more coaxial cables and/or fiber optic cables;

receiving, from one of said client devices via said one or more coaxial cables and/or fiber optic cables, a request that said client device be permitted to enter a power-saving mode of operation;

in response to said request, entering a power-saving mode of operation which comprises transmitting a message granting said network device permission to enter said power-saving mode of operation, wherein said message granting said network device permission to enter said power-saving mode is an MPEG transport stream packet having a first program identifier (PID) that;

is uniquely associated with messages that manage power consumption in the DOCSIS network; and

is different from a second PID used for MPEG transport stream packets that carry DOCSIS messages.

10. The method of claim 9, comprising:

buffering traffic destined for said one of said client devices in a buffer of said host device while said one of said client devices is in said power-saving mode of operation; and

upon an amount of traffic stored in said buffer reaching a threshold, transmitting a message to trigger said network device to transition out of said power-saving mode of operation.

11. A system comprising:

circuitry for use in a cable modem termination system (CMTS) of a DOCSIS network, said circuitry being operable to;

receive a request that a network device be permitted to enter a power-saving mode of operation;

in response to said request, enter a power-saving mode of operation in which a message granting said network device permission to enter said power-saving mode of operation is transmitted, wherein said message granting said network device permission to enter said power-saving mode is an MPEG transport stream packet having a first program identifier (PID) that;

is uniquely associated with messages that manage power consumption in the DOCSIS network; and

is different from a second PID used for MPEG transport stream packets that carry DOCSIS messages.

12. The system of claim 11, wherein said network device is a cable modem, cable set-top-box, or cable gateway.

13. The system of claim 14, wherein said MAC management messages comprise MAP and/or upstream channel descriptor (UCD) messages.

14. The system of claim 11, wherein, while in said power-saving mode of operation, said circuitry is operable to start a sleep timer upon transmitting said MAC management message.

15. The system of claim 14, wherein said circuitry is operable to deregister said network device if no communication is received from said network device prior to expiration of said sleep timer.

16. The system of claim 14, wherein said circuitry is operable to determine a value at which said sleep timer expires based on network traffic statistics.

17. The system of claim 11, wherein:

said request is a media access control (MAC) management message; and

contents of a type value field of said request are uniquely associated with requests for permission to enter a power-saving mode of operation.

19. The system of claim 11, comprising buffering traffic destined for said network device in a buffer of said CMTS while said network device is in said power-saving mode of operation.

20. The system of claim 19, wherein said circuitry is operable to, upon an amount of traffic stored in said buffer reaching a threshold, transmitting a message to trigger said network device to transition out of said power-saving mode of operation.

18. (canceled)