Impact of busy lines and mobility on call blocking in a PCS network

Yi-Bing Lin*, Wai Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Several analytical models have been proposed to study the blocking probability for personal communications service networks or mobile phone networks. These models cannot accurately predict the blocking probability because they do not capture two important features. First, they do not capture the busy-line effect. Even if a cell has free channels, incoming and outgoing calls must be dropped when the destination portable is already in a conversation. Second, they do not capture the mobility of individual portables. In these models, mobility is addressed by net hand-off traffic to a cell, which results in traffic with a smaller variance to a cell compared with the true situation. We propose a new analytic model which addresses both the busy-line effect and individual portable mobility. Furthermore, our model can be used to derive the portable population distribution in a cell. The model is validated against the simulation experiments. We indicate that the previously proposed models approximate a special case of our model where the number of portables in a cell is 40 times larger than the number of channels.

Original languageEnglish
Pages (from-to)35-45
Number of pages11
JournalInternational Journal of Communication Systems
Issue number1
StatePublished - 1 Jan 1996


  • Blocking probability
  • Handoff
  • Mobility
  • Personal communications

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