The impact of the DOCSIS 1.1/2.0 MAC protocol on TCP

Martin, Jim

doi:10.1109/ccnc.2005.1405187

Cited by 3 publications

(2 citation statements)

References 14 publications

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“…In prior work we have shown that performance can deteriorate as the MAP time grows [28,29]. The contention request allocation strategy and the use of fragmentation, concatenation and piggybacking also have significant impact on system performance.…”

Section: The Simulation Modelmentioning

confidence: 99%

“…In the second study conducted on the testbed we analyzed the throughput of a single "always on" TCP application. In previous work we concluded that the upstream channel of a DOC-SIS system, because of its inability to return ACK packets at a high rate [29], can become a bottleneck in the downstream transport of bulk data. We created a single TCP flow in the downstream direction on the testbed and observed a maximum TCP throughput of 3.6 Mbps.…”

Section: The Tcp Throughput Workloadmentioning

confidence: 99%

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A Simulation Model of the DOCSIS Protocol

Martin

Westall

2007

SIMULATION

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The number of households and businesses using hybrid fiber coaxial cable networks for Internet access is rapidly approaching 40 million in the United States. The cable industry has standardized on a single medium access control (MAC) and physical layer standard, the Data Over Cable Service Interface Specification (DOCSIS). The MAC layer of the emerging IEEE 802.16 broadband wireless access standard is also based upon DOCSIS. Thus, the performance of DOCSIS is now and will remain a critical element in the overall performance of shared medium broadband access networks. Despite this fact, public domain tools that may be used to assess and improve the performance of DOCSIS have been slow to emerge. To address this problem, we have implemented a simulation model of the DOCSIS MAC layer for the 'ns' network simulation tool. Due to the complexity of DOC-SIS and because the specifications are purposely incomplete, developing an accurate simulation is quite challenging. In this paper we present analytic and live network evidence that the simulation accurately reflects the behavior of a DOCSIS network under a limited set of workloads.

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Section: The Simulation Modelmentioning

confidence: 99%

Section: The Tcp Throughput Workloadmentioning

confidence: 99%