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<div class="div">
<h1>TRX Transmit Booster Unit</h1>

<p>The TX transmit booster increases the typical output power
of the BTS from 39.5 dB to 46.5 dB (measured at the antenna connector). A
TRX transmit booster enhances downlink performance and is used to balance
the link in a downlink limited situation. In addition, the TX transmit booster
increases the cell size.</p>


<p>A booster unit will be of the same size as a regular TRX
unit and will be located inside the BTS cabinet to a TRX slot. The maximum
configuration with boosted TRXs is 1+1+1 in one cabinet and 2+2+2 in 2 cabinets.</p>


<p>In areas where more than 2 TRXs are needed in a cell, configurations
like 3+3 TRXs, 4+2 TRXs, or 6 TRXs at one site are supported. Larger configurations
such as 3+3+3 or 4+4+4 TRXs can be achieved by using this feature and ‘Nokia
Talk-family BTS synchronisation’ feature.</p>


<a name="apr16485532" shape="rect"></a>
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<img alt="urn:mars:dn0469729:1:en:global:tiff:data:data" border="0" src="NED?action=retrieve&amp;identifier=dn0469729&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /><p class="figure-caption">Figure: Two, four, or six TRXs per sector with as many antennas by multiplying
two-TRX dual-duplexed blocks</p>
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<img alt="urn:mars:dn0469783:1:en:global:tiff:data:data" border="0" src="NED?action=retrieve&amp;identifier=dn0469783&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /><p class="figure-caption">Figure: Three TRXs per sector with three antennas</p>
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<p>A new filtering unit (AFH) is needed to accommodate for
the higher output power of the TRX. Booster alarms will be routed through
AFH.</p>


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<dl class="note-notification">
<dt class="note-caption">Note</dt>
<dd>When the 'ICE support for booster' is in use, the boosted
and non-boosted TRXs have to be configured as separate cells each with their
own BCCH. For this reason, the handover support for coverage enhancement is
not supported with the  ‘ICE support for booster’ feature.</dd>
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