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<h1>Forced Handover for O&amp;M Reason</h1>

<p>The aim in all operating tasks should be avoiding any disturbance
to traffic. When an O&amp;M operation requires blocking of an active cell
or the working TRX, the ongoing calls can be handed over to the other TRXs
of the cell or to neighbouring cells by means of the Forced Handover procedure.</p>


<p>Forced handover is available with the commands 'Lock BTS'
and 'Lock TRX' as an option. The operator is able to determine the maximum
time, during which handovers are tried to make. Also the features 'Intelligent
Shutdown with timer control' and 'Preferred BCCH' utilise forced handover.</p>


<p>With the forced handover procedure, all ongoing calls are
tried to hand over to other TRXs of the cell (if only one TRX is cleared from
the traffic) or to the neighbouring cells (if the whole cell is cleared).
During the execution of the forced handover procedure, access to the cell
or TRX is barred to prevent mobile stations from new call attempts. Incoming
handovers to that particular cell or TRX are also prevented.</p>
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