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Nnochiri, I. U.
Department of Computer Engineering, Michael Okpara University of Agriculture, Umudike, Nigeria
Iroegbu, C.
Department of Electrical/Electronic Engineering, Michael Okpara University of Agriculture, Umudike Nigeria
ABSTRACT
In
cellular networks, the signal strength and interference at various locations
differs within a cell and this affects the quality of the on-going call
including handoff calls. This may require the transfer of the on-going call to
another cell with a better signal strength.
This research evaluates cellular channel performance in terms of
probability of blocking. It examines the queuing system that will be more
suitable when either or both priority is given preference. It was observed
that, for cell sites with traffic intensity to channel ratio of 0 – 0.75 which
is considered as not congested, a system of either queuing the originating
calls or the handoff calls can be employed. For a congested system in which the
traffic intensity to channel ratio is 0.76 – 1 there should be separate queuing
of both the originating calls and the handoff calls to provides the best
network optimization. At the queue size of 2 in the site located at Umudike,
the probability of blocking was approximately at 0.022. This effect was
insignificant since it does not really make any difference due to the initial
probability of blocking. Thus, system of either queuing the originating calls
or the handoff calls can be employed. For
a very efficient system like the site at Lodu Ndume, it was seen that the
maximum blocking probability that can ever be offered to an originating call
when handoff calls are queued was 0.000419 (4.19 x 10-4). This
probability was very small; which means queuing handoff calls will hardly have
any effect on the originating calls as the blocking probability of the
originating calls rises only by a very small margin. The research concludes
that, the blocking probability decreases with increasing number of channels and
decreasing amount of loads.
Keywords: Handoff calls, Originating calls, probability of blocking, traffic intensity
https://doi.org/10.33922/j.ujet_v8i2_4
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Published
Thursday, December 22, 2022
Issue
Vol. 8 No. 2, December 2022
Article Section
GENERAL
The contents of the articles are the sole opinion of the author(s) and not of UJET.
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