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<h1>Dynamic SDCCH Allocation</h1>

<p>The feature Dynamic SDCCH makes it possible to configure
the SDCCH resources according to the actual SDCCH traffic situation of a cell.
When a BTS needs temporarily larger SDCCH capacity than normally, idle TCH
resources are configured for the SDCCH use by the BSC. When the SDCCH congestion
situation is over the extra SDCCH resources are configured back to TCH resources.</p>


<p>Especial benefit is derived from the feature in the traffic
cases where the signalling is the only transmission mode during the connection
to the network. Short Message service (SMS) traffic as well as location updatings
are counting among them. In some special places - airports, ports - the location
updatings can produce sudden short time SDCCH traffic peaks, which can now
be handled without any need to configure extra permanent SDCCH capacity for
safety’s sake only.</p>


<p>The operator is required to configure to the BTS the minimum
static SDCCH capacity sufficient to handle the normal SDCCH traffic.</p>


<p>The extra SDCCH resource is allocated only when the actual
SDCCH congestion situation has been fallen into after the last free SDCCH
is allocated. Consequently, when the dynamic SDCCH radio resource is totally
free again, it is immediately configured back for TCH use. Thus the maximum
number of TCHs is always in traffic use depending on the actual need of the
SDCCH resources at each moment.</p>
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