Effect of Mobile Terminal Speed on QoS Parameters during Handoff Process in Wireless ATM Network
Keywords:
Handoff Dropping probability, New Call Blocking Probability, Wireless ATM network, Markov ChainAbstract
In this research the effect of the mobile terminal speed on the handoff call dropping probability (HCDP) and new call blocking
probability (NCBP) in wireless Asynchronous Transfer Mode (WATM) network is investigated. As a mobile terminal moves
from one radio cell to another, a handoff process is needed to change its point of attachment on the network and the mobile speed
affects these QoS parameters. In this study, a cell of 500 m radius was assumed and the mean call duration fixed at 180 seconds.
The simulation numerical results show that the HCDP and NCBP exhibit error margins between decisions reached without the
consideration of the mobile terminal speed. At a moderately low traffic intensity of 2018 erlangs, the error margins in HCDP at
the mobile speed of 25, 50, 75, 100 and 125 km/hr are respectively 4.01E-22, 1.91E-17, 7.54E-15, 6.83E-13 and 6.42E-12. The
NCBP error margins at these speeds are respectively 5.56E-11, 2.50E-06, 9.57E-4, 8.54E-2 and 7.94E-1. This clearly shows that
the error margin increases with increase in mobile terminal speed and the effect is more pronounced on NCBP.
