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<h1>Double BCCH Allocation List</h1>

<p>This feature introduces the possibility to define a list
of BCCH carriers to be used in cell selection and reselection by the MS, which
is in Idle State.</p>


<p>The list is sent to the MS in System Information Message
type 2 on the BCCH, and the MS may store it when powering down. Now the MS
does not have to search through the whole band when powering up. If the list
contains all the BCCH carriers of a certain geographical area of a PLMN, the
MS can use it to search the suitable RF channels quickly in order to camp
on a cell.</p>


<p>Another aspect of this feature is that the operator is
able to monitor all the neighbours of a certain cell. By using the idle state
BCCH allocation list, which contains all BCCH frequencies (which is different
from active state list) during a call, it is possible to get information about
the neighbours, which are not defined in the active state neighbour list (and
are thus missing from the adjacent cell definitions even though they may be
good adjacent cell candidates).</p>


<p>When the lists are created, the operator may assign cell
by cell any of those BA lists to the BCCH allocation idle state list, and
the same list may also be assigned to the BCCH allocation neighbour cell list.
If the operator does not assign a BA list to the BCCH allocation idle state
list, the list of real neighbours - specified in the radio network database
- is used as default.</p>
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