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<h2>Admission Control (AC) and Channel Allocation</h2>

<p>Guaranteeing throughput means changes in channel allocation and scheduling.
In addition to these, new functionalities for checking resources before allowing
connection to a cell and monitoring the connection during transmission are
also introduced.</p>


<p>Admission Control is used to calculate what network resources
are required to provide the requested QoS, to determine if resources are available,
and to reserve them. AC estimates if the network elements have enough resources
to accommodate a new BSS PFC and, as a result, ensures the QoS during call
set-up. When resources available for reservation or monitored resources are
low, new connections can be declined.</p>


<p>For services that require a guaranteed throughput, AC needs
the following information in order to decipher whether there are resources
available to guarantee the QoS requirements:</p>


<ul>
<li><p>throughput requirements: guaranteed
and maximum bitrate requested</p>
</li>
<li><p>information about the quality of the
radio channels.</p>
</li>
</ul>


<p>For realtime traffic classes Channel Allocation is done so that the
guaranteed bitrate can be fulfilled. For non-realtime traffic classes resources
giving highest bitrate are allocated.</p>


<p>The radio channel quality information is used to translate
the throughput requirements from an MS application into radio resources at
the BSS side, that is, into a number of TSLs required to ensure the guaranteed
bitrate. After AC has estimated that there are sufficient resources available
to accommodate a new BSS PFC, channel allocation for streaming services is
done to GPRS or EPGRS territory. </p>


<p>If channels are needed to handle incoming CS traffic in
the above-mentioned territories, their size can be downgraded in order to
free TSLs for CS use. However, downgrading can also be rejected if it would
cause quality class degradation for streaming services with guaranteed bitrate
in assigned timeslots. In a BTS where EQoS is supported, a new procedure called
GPRS territory downgrade permission request procedure is used. CSW RRM asks
the PCU if GPRS territory downgrade is allowed. If there are streaming BSS
PFCs allocated to downgraded timeslots and they cannot be reallocated, the
PCU rejects the permission request. </p>


<p>The scheduler shares the radio resources using the Bucket
Round Robin (BRR) algorithm. The scheduler gives transmission turns primarily
to real-time guaranteed bitrate and non-realtime nominal bitrate portion of
capacity. The resources are shared in traffic class and allocation retention
priority order. The weight factors of allocation retention are set by the
operator.</p>
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