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<h1>SMS-CB DRX</h1>

<p>This feature is an enhancement to the cell broadcast feature.
With the help of it, the mobile stations are able to receive only the needed
part of CBCH, and hence the battery consumption decreases.</p>


<p>When the SMS-CB DRX is employed, the BSS transmits Schedule
Messages. A Schedule Message includes information about the number of immediately
following consecutive CB messages, planned for that cell.  The length of time
covered by the CB messages referred to in a Schedule Message is called the
Schedule Period of that message.  In NTC BSS the length of Schedule Period
is one minute.</p>


<p>For an optimal DRX, a new Schedule Message follows the
last message of a Schedule Period, which is the case in NTC BSS. When no information
is known about a CB message, for example, because no Schedule Message has
been received referring to that CB message, a mobile station shall read at
least the first block of each CB message.</p>


<p>The Schedule Message contains a Message Description for
each CB message to be broadcasted during the scheduling period, in order of
transmission. The position of a CB message is called the ‘message slot number’
of the CB message, and it indicates the position of the CB message within
the schedule period.</p>


<p>An MS starts working in the DRX mode after a power up when
it has received all the messages of interest sent in the schedule period previous
to the current one, and when it has received the first schedule message of
current period.  In this mode, the MS can understand from the first block
of the schedule message how many new messages there are, and when they will
be transmitted. It also understands their message identifiers if there are
less than 6 new messages, and possibly the positions of their repetitions.
If the first block indicates that there are no new messages, or sufficiently
few so that their message identifiers and the positions of their repetitions
are known, the MS can refrain from reading the other blocks of the Schedule
Message. If there are no new messages at all in the successive scheduling
periods, the MS may read only the first blocks of the Schedule Messages.</p>
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