Systems and methods for transitioning between fragmentation modes

• US 7,957,318 B1
• Filed: 08/31/2009
• Issued: 06/07/2011
• Est. Priority Date: 09/12/2002
• Status: Expired due to Term

• Current Assignee: Juniper Networks Incorporated
• Original Assignee: Juniper Networks Incorporated
• Inventors: Hou, Victor
• Primary Examiner(s): Trost, IV; William
• Assistant Examiner(s): Nguyen; Toan D
• Application Number:
  US12/550,713
• Time in Patent Office: 645 Days
• Field of Search: 370/252, 370/346, 370/352, 370/465, 370/474, 370/480, 370/468, 725/111, 725/129, 709/219
• US Class Current: 370/252
• CPC Class Codes: H04L 12/2801 Broadband local area networks
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/41 by acting on aggregated flows or links
• CPC Class Codes: H04L 47/43 Assembling or disassembling of packets, e.g. segmentation and reassembly [SAR]

Abstract

A cable modem termination system that connects to cable modems includes a scheduler and a system manager. The scheduler schedules transmission opportunities for the cable modems and operates in multiple fragmentation modes. The scheduling of transmission opportunities by the scheduler differs among the fragmentation modes. The system manager compares one or more processing parameters associated with the cable modem termination system to one or more thresholds and causes the scheduler to transition among the fragmentation modes based on a result of the comparison.

Claims

1. A method, performed by a cable modem termination system (CMTS), for transitioning between first and second fragmentation modes in a cable routing system, the method comprising:

entering, by the CMTS, the first fragmentation mode;

analyzing, by the CMTS, one or more processing parameters against one or more thresholds; and

transitioning, by the CMTS, to the second fragmentation mode when at least one of the one or more processing parameters is less than the one or more thresholds.

2. The method of claim 1, where the first fragmentation mode is a piggyback mode and the second fragmentation mode is a multiple grant mode.

3. The method of claim 1, where the one or more processing parameters include information regarding at least one of processor occupancy, traffic load, or a number of cable modems or service flows.

4. The method of claim 1, where the one or more processing parameters include information regarding at least two of processor occupancy, traffic load, or a number of cable modems or service flows.

5. The method of claim 1, further comprising:

establishing the one or more thresholds based on one or more thresholds from an operator.

6. The method of claim 1, where the one or more thresholds includes one or more high thresholds and one or more low thresholds corresponding to each of the one or more processing parameters.

7. The method of claim 6, where the analyzing the one or more processing parameters includes:

determining one or more current values for the one or more processing parameters, and

comparing the one or more current values to the corresponding one or more high thresholds.

8. The method of claim 6, further comprising:

determining one or more current values for the one or more processing parameters,

analyzing the one or more current values against the one or more high thresholds, and

transitioning back to the first fragmentation mode when at least one of the one or more current values exceeds the corresponding one or more low thresholds.

9. The method of claim 1, further comprising:

transitioning back to the first fragmentation mode when at least one of the one or more processing parameters exceeds the one or more thresholds.

10. A system for transitioning between a piggyback mode and a multiple grant mode within a cable routing environment, the system comprising:

a processor to;

enter the piggyback mode;

analyze the one or more processing parameters against one or more thresholds; and

transition to the multiple grant mode when at least one of the one or more processing parameters is less than the one or more thresholds.

11. The system of claim 10, where the processor is further to:

transition back to the piggyback mode when at least one of the one or more processing parameters exceeds the one or more thresholds.

12. A method, performed by a cable modem termination system (CMTS), the method comprising:

comparing, by the CMTS, one or more processing parameters to one or more thresholds, and

transitioning, by the CMTS, between fragmentation modes based on a result of the comparison.

13. The method of claim 12, where the fragmentation modes include a multiple grant mode and a piggyback mode.

14. The method of claim 12, where the one or more processing parameters include information regarding at least one of processor occupancy, traffic load, or a number of cable modems or service flows serviced by the cable modem termination system.

15. The method of claim 14, further comprising:

establishing the one or more thresholds based on one or more thresholds from an operator.

16. The method of claim 14, where the one or more thresholds include one or more high thresholds and one or more low thresholds corresponding to each of the one or more processing parameters.

17. The method of claim 16, where comparing the one or more processing parameters comprises:

determining one or more current values for the one or more processing parameters, and

analyzing the one or more current values against the one or more low thresholds and the one or more high thresholds; and

where transitioning between fragmentation modes comprises;

transitioning to another one of the fragmentation modes when at least one of the one or more current values is less than the corresponding one or more low thresholds or at least one of the one or more current values exceeds the corresponding one or more high thresholds.

18. The method of claim 12, where the one or more processing parameters include information regarding at least two of processor occupancy, traffic load, or a number of cable modems or service flows serviced by the cable modem termination system.

19. The method of claim 12, where transitioning between fragmentation modes comprises:

switching to another one of the fragmentation modes when at least one of the one or more processing parameters exceeds the one or more thresholds.

20. The method of claim 12, where transitioning between fragmentation modes comprises:

switching to another one of the fragmentation modes when at least one of the one or more processing parameters is less than the one or more thresholds.