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<title>Discontinuous Reception (DRX)</title>
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<h1>Discontinuous Reception (DRX)</h1>

<p>The BSC calculates the correct paging group for a paging
message according to the IMSI of the subscriber being paged. This group number
is added to the paging message sent to the BTS. The BTS then schedules this
paging message for transmission over the air interface in the correct paging
group as commanded by the BSC. This feature enables mobiles to listen to their
own paging group only and thus prolongs battery lifetime considerably. Only
one CCCH timeslot is supported.</p>


<p>The BTS supports all paging request types 1, 2, and 3.
This allows an efficient use of the downlink CCCH as several mobiles can be
paged by one message.</p>
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