Bonded Deficit Round Robin Scheduling for Multi-Channel Networks

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Executive Summary

In order to increase the link capacity in telecommunication networks the bandwidth of multiple channels can be aggregated by transmitting on them simultaneously. The latest data-over-cable service interface specification (DOCSIS 3.0) for hybrid fiber coax networks defines a mechanism for channel bonding at the link layer. Thus, the scheduler at the cable modem termination system, which distributes the packets on the network, not only has to support per-flow queuing but also has to distribute the packets to one modem over possibly several channels. In this paper, the authors propose two downstream multi-channel packet scheduling algorithms designed to support scheduling amongst flows possibly using different numbers of channels. Both algorithms are based on the Deficit Round Robin (DRR) scheduler.

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