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<title>Intra PCU Cell Reselection Improvement</title>
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<h1>Intra PCU Cell Reselection Improvement</h1>

<p> (E)GPRS intra PCU cell reselection is improved so that
during the cell change, the untransferred data is not deleted from the old
cell (BVCI) buffer immediately (5s delay applied). This improves the end user
experience during the intra PCU cell change as the untransferred data is moved
to the new cell and data transfer may continue immediately after the MS has
completed cell update procedure (the flush received from the SGSN to the old
cell). In case of an inter PCU cell re-selection, this untransferred data
is deleted. The impact of intra vs. inter PCU cell re-selection is illustrated
in following figures.</p>


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<img alt="urn:mars:dn0469323:1:en:global:tiff:data:data" border="0" src="NED?action=retrieve&amp;identifier=dn0469323&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /><p class="figure-caption">Figure: Typical GPRS dataflow with one intra PCU cell re-selection</p>
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<img alt="urn:mars:dn0469335:1:en:global:tiff:data:data" border="0" src="NED?action=retrieve&amp;identifier=dn0469335&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /><p class="figure-caption">Figure: Typical GPRS dataflow with one inter PCU cell re-selection</p>
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<p>As can be seen from the figures above, the end user experience
in data throughput is much better with intra PCU cell re-selection compared
to inter PCU cell re-selection. Therefore, it is necessary to create a radio
network configuration where as many cell reselections as possible occur as
intra PCU reselections. This means that as many neighbouring cells as possible
need to be allocated into the same controlling PCU (NSEI). For this purpose,
the newest SW includes an improved NSEI selection algorithm, which locates
the cells (BVCIs ) in the same BCF to the same NSEI. The algorithm also tries
to locate the cells, which have adjacencies between each other to the same
NSEI.  If a Dynamic Abis Pool (EDGE) is defined for a TRX in a cell and when
(E)GPRS is enabled for the cell, the same NSEI (PCU) is selected for the cell
as for the Dynamic Abis Pool. In this case, the NSEI selection algorithm is
not used. When the upgrade into S10.5(ED) is done,  cells are not automatically
re-distributed ((E)GPRS RNW re-planning), and the distribution needs to be
done manually after the upgrade. If the re-allocation is not done, the allocation
may be as presented in following figure, and most of the cell re-selections
occur as inter-PCU, and the end-user experience is unnecessarily worsened.
The target for the re-allocation is to get an optimum allocation as presented
in the last figure to get as many cell re-selections as possible to occur
as intra-PCU to improve the end-user experience.</p>


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<img alt="urn:mars:dn0469635:1:en:global:tiff:data:data" border="0" src="NED?action=retrieve&amp;identifier=dn0469635&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /><p class="figure-caption">Figure: Example allocation of cells between active NSEIs after the S10.5(ED)
upgrade (allocation done with S9 algorithm)</p>
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<p>There are two ways to do the re-planning:</p>


<ol class="type-odd">
<li type="1"><p>PCU selection manually (only available
option with EDGE)</p>
</li>
<li type="1"><p>PCU selection automatically</p>
</li>
</ol>


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<img alt="urn:mars:dn0469647:1:en:global:tiff:data:data" border="0" src="NED?action=retrieve&amp;identifier=dn0469647&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /><p class="figure-caption">Figure: Optimum allocation of cells between active NSEIs</p>
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