PCUP: Pipelined Cyclic Upstream Protocol over Hybrid Fiber Coax

Ying-Dar Lin*, Chia Jen Wu, Wei Ming Yin

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


In order to span NII (National Information Infrastructure) into the homes, the community cable TV networks have to be re-engineered to support two-way interactive services. In this work, we propose PCUP (Pipelined Cyclic Upstream Protocol) as the upstream MAC (Medium Access Control) protocol for HFC (Hybrid Fiber Coax) community access network. PCUP is designed with the intention of pipelining the upstream channel. This is achieved by proper station positioning, which measures the station propagation offset from the headend, and transmission scheduling, which assigns each station the transmission starting time and duration in a cycle. By taking into account the propagation offsets and the transmission times, transmitted cells can appear back-to-back, i.e. pipelined, at the headend. Since only the active stations are scheduled to transmit in a cycle, a membership control mechanism, which runs a contention-based tree walk algorithm, is executed periodically to allow the stations to join or leave. We also compare PCUP with various schemes proposed to IEEE 802.14 committee.

Original languageEnglish
Article number631140
Pages (from-to)1165-1173
Number of pages9
JournalProceedings - IEEE INFOCOM
StatePublished - 7 Apr 1997
EventProceedings of the 1997 16th IEEE Annual Conference on Computer Communications, INFOCOM. Part 1 (of 3) - Kobe, Jpn
Duration: 7 Apr 199712 Apr 1997


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