TCP behavior over HFC cable modem access networks

  • Authors:
  • S. Chatterjee

  • Affiliations:
  • Computer Information Systems Department, Georgia State University, Atlanta, GA 30302-4015, USA

  • Venue:
  • Computer Communications
  • Year:
  • 1999

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Abstract

Hybrid Fiber-Coax based CATV networks have the potential for two-way data services. Such network providers are presently re-inventing the CATV network to provide Internet access. This paper presents a simulation study of the dynamic behavior of TCP over HFC cable modem networks. We believe that this is the first such study as per our knowledge that considers asymmetry and its impact on TCP behavior. The performance of TCP connections with respect to flow control, adaptive retransmission mechanism and slow-start congestion control are studied and analyzed. In particular, we explain the dramatically different behavior and dynamics that are observed for TCP connections using interactive data (remote-login), bulk data (FTP) and Web traffic (HTTP). We further study and discuss the impact of several important TCP and system parameters to optimize performance in CATV networks.