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<h1>GPRS Non_DRX mode on CCCH</h1>

<p>When MS is in the DRX (Discontinuous Reception) mode, it
is only required to monitor the radio blocks defined by its paging group.
The DRX mode is used to conserve battery power.</p>


<p>The non-DRX mode period occurs when the mobile station
has left the packet transfer mode and enters packet in idle mode. The non-DRX
timer negotiated during the GPRS Attach procedure determines this period of
time. The purpose of this period is to minimise the delay in establishing
this subsequent downlink TBF. During this period, the MS is reading all AGCH/PAGCH
and PCH/PCCH blocks on its assigned CCCH or PCCCH.</p>


<p>The negotiation of DRX parameters is per MS. DRX parameters
are received from the SGSN.</p>


<p>There is a new parameter:</p>


<p><span class="parameter-sem">DRX_TIMER_MAX</span>:
The maximum duration for non-DRX mode period in the cell. The parameter value
is given as two taken to the power of the binary value minus one (2 (bv -
1) ) in units of 1 second. The binary value zero indicates that non-DRX mode
is not supported in the cell that is, the parameter takes the values: 'not
supported', 1 s, 2 s, 4 s, .. 64 s. </p>
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