Analisis Perpindahan Kanal Komunikasi dalam Satu BSC pada Sistem GSM Berdasarkan Data Drive Test Menggunakan TEMS Investigation 4.1.1
ABSTRACT: Mobile
communications system created to meet the communication needs that can be done
anywhere either when user is motionless or moving. To maintain the quality of
services in a wide service area, coverage area is divided into smallest
geographic units called cells. If the user moves from one area of the cell to
another, then it needs an algorithm that guarantees the continuity of
communications services. These algorithm is called a handover to a dedicated
mode and the cell reselection for idle mode. In observing handoff algorithm,
the operator did a drive test using computer and handset, which each had been
equipped with special software, and GPS. This research analyze the problems
related to the handoff algorithm, both when in idle mode or dedicated mode,
including the causes, processes and things that influence it. Data acquisition
is carried out through a drive test using software TEMS Investigaions GSM 4.1.1
with routes in the downtown area of Semarang. Drive test held on every Thursday
and Sunday for three consecutive weeks starting on August 23, 2009 and each of
day divided into three time allocation, ie morning, noon and night. The
observed event include: cell reselection, handover, handover (intracell),
handover failure and intracell handover failure. In addition Information
Element that effected on the event are also observed, path loss criteria and
cell reselection criteria for cell reselection, and received power, bit error
rate and timing advance for the four other events. From the analysis is known
that the assignment channel is triggered by the Information Element value that
reaches a certain threshold value. For cell reselection, the both Information
Element having equal influence. Information Element of the most influential for
the handover and the handover failure is received power, whereas for two other
events the most influential is the received bit error. After the detected value
of the Information Element reaches a certain threshold, MSC will instruct the
candidate cell to monitor and serving mobile station. Different process going
on for handover (intracell), which after the information element value is known
at a certain threshold, MS will move to another traffic channel in the same
cell. If handover (intracell) was requested but could not be performed then
handover based quality is tried the next time (if criterion is still given).
When this handover also fails then BS toggles back and tries again a handover
(intracell). In this drive test result there are 15 handover failures that may
because no available traffic channel in candidate cell. There is only once
handover intracell failure happened which may be caused by full traffic in
candidate channel, but no cell reselection failure is found because this event
doesn’t need traffic channel but only signaling channel.
Penulis: LULUK ARIFATUL
CHALIDA, IMAM SANTOSO, YULI CHRISTYONO
Kode Jurnal: jptlisetrodd090111
