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<h1>Overview of Extended Uplink TBF</h1>

<p>Typically releasing the Uplink TBF is done immediately
if an MS has no data to send. This happens providing that the Downlink TBF
from the MS to the BSC exists, or otherwise the delay timer is started and
after expiration of it the Uplink TBF is released. If during the release procedure
the MS suddenly has new data to send, a new Uplink TBF has to be established.</p>


<p>When the MS is supporting the Extended Uplink TBF and the
MS has received information from the network in the system information messages
(SI13 or PSI1) that also the network is supporting, the release of the Uplink
TBF can be prolonged even the MS occasionally has nothing to send to the network
along the Uplink TBF. Right after the MS has new data to send, the same Uplink
TBF can be used for that purpose.</p>


<p>Extended Uplink TBF requires the 3GPP Rel. 4 GERAN feature
package 1 mobile stations.</p>


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<h2>Benefit
of Nokia solution</h2>

<p>Extended UL TBF Mode is applied instead of the 'Delayed
UL TBF release' of the current Nokia implementation for mobile stations supporting
the GERAN feature package 1 (Rel4 mobile stations). As in the current implementation,
with Extended UL TBF Mode the UL TBF release can be delayed in order to make
it possible to establish the following downlink TBF on PACCH.</p>


<p>Additionally, the Extended UL TBF Mode allows the mobile
station to continue the data transfer if it gets more data to send when the
countdown procedure has begun. Without this feature the release of the current
TBF is required and a new one is established, causing more delay and signalling
load.</p>


<p>Benefit of this is that occasional short breaks in data
transmission are not causing delay of activation of new Uplink TBF, which
is seen as decrease in perceived service quality by the end user, for example,
in speech delivery in PoC.</p>
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<h2>Related topics</h2>

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