@article{Halgamuge2011call,
author = {M. N. Halgamuge and H. L. Vu and K. Ramamohanarao
and M. Zukerman},
title = {A call quality performance measure for handoff
algorithms},
journal = {International Journal of Communication Systems},
volume = {24},
number = {3},
pages = {363-383},
month = {Mar.},
year = {2011},
abstract = {This paper proposes a new approach for
performance evaluation and comparison between existing handoff algorithms taking
into consideration signal levels, call dropping, and handoff cost. Using the new
approach, existing handoff algorithms are then compared in terms of signal
quality and number of handoffs required to achieve a desired overall signal
quality. We also provide in this paper a method to estimate handoff cost and to
optimize handoff sequences for retrial (where repeated call attempts are made
after a call is lost) and non-retrial models based on the proposed approach. We
observe that the Threshold with Hysteresis method performs better than other
known methods including the one used in the GSM standard. Our results indicate
that the Threshold with 4 dB Hysteresis method performs well for urban areas
although with a high dropping probability, whereas the Threshold with 6 dB
Hysteresis method suits for suburban areas with a low dropping probability. We
find that handoff sequences obtained by existing handoff methods are less
efficient than the optimal handoff sequence given in the paper by a margin of
29¨C45% for retrial model, and by 34¨C77% for non-retrial model. The paper also
suggests some specific parameter values to improve the performance of currently
used handoff methods based on our findings.}
}