Abstract

We propose energy-saving algorithms to improve the energy efficiency of hybrid fiber coaxial (HFC) networks that support DOCSIS (Data Over Cable Service Interface Specification) 3.0 standard. The algorithms incorporate a traffic-aware approach and modify the operation statuses of the two primary network elements, the cable modem (CM) and the cable modem termination system (CMTS), dynamically. For the CM-side operation, we first propose a basic algorithm that can optimize the CMs’ energy efficiency, regardless of significant increase of the packet delay and the number of operation changes (NoOC). We then propose two modified approaches to reduce the packet delay and NoOC while saving energy. Simulations with these algorithms show 37.5%–42.2% energy saving on the CM side, compared to the traditional case where the CMs’ operation statuses are static. Next, we propose a CMTS-side energy-saving algorithm to find the actual connection mapping between the CM channels and CMTS ports. The proposed algorithm tries to support CM connections with minimal numbers of CMTS ports. To further improve the energy efficiency of the CMTS, we design a readjustment approach that can reorganize CM connections on CMTS ports based on their loads. Simulation results show that 31.08%–32.61% energy saving can be achieved on the CMTS in total. Hence, the proposed algorithms achieve effective energy saving on both the CM and CMTS sides.

© 2012 OSA

Full Article  |  PDF Article

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (12)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (3)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription