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<h1>Frequency Plan Changing</h1>

<p>A major part of frequency plan may require changing when
new cells or channels are introduced to the network. Sometimes the entire
plan is changed.</p>


<p>In an operation network, large changes are critical in
regard to the time consumption, network consistence, and safety. The new plan
must be taken into use overnight without remarkable degrading of the service.
If the new frequency plan is changed from the NetAct the conventional way,
that is, first locking a TRX, then changing its frequency, and finally unlocking
it, the whole operation for a large network may take too long.</p>


<p>This feature offers an advanced way to make large changes
into the frequency plan. The following essential matters are covered:</p>


<ul>
<li><p>The new plan is loaded down as a background
operation without affecting the actual plan. The plan may come either from
the NetAct or from the local MML interface.</p>
</li>
<li><p>Downloading errors are tolerated. Possibly
interrupted downloading may be repeated without harmful effects on traffic
performance.</p>
</li>
<li><p>New plan is quickly activated in the
radio network after the downloading and possible consistency checking. Thus,
disturbance in the network is remarkably shorter than previously.</p>
</li>
<li><p>The previous plan stays in the BSC
for back up. It may be reactivated quickly.</p>
</li>
</ul>


<p>This feature supports the following network plan parameters:</p>


<ul>
<li><p>Frequencies</p>
</li>
<li><p>Frequency Hopping Parameters</p>
</li>
<li><p>Base Station Identity Codes (BSIC)
and Training Sequence Codes (TSC)</p>
</li>
<li><p>TRX parameters of the Intelligent Underlay-Overlay
feature.</p>
</li>
</ul>


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