Specifications

Table Of Contents
Cinterion
®
ALAS5V Hardware Interface Description
4.3 Power Saving
96
ALAS5V_HID_v00.030a 2019-03-20
Confidential / Preliminary
Page 84 of 124
4.3.2 Power Saving while Attached to WCDMA Networks
The power saving possibilities while attached to a WCDMA network depend on the paging tim-
ing cycle of the base station.
During normal WCDMA operation, i.e., the module is connected to a WCDMA network, the
duration of a paging timing cycle varies. It may be calculated using the following formula:
t = 2
DRX value
* 10 ms (WCDMA frame duration).
DRX (Discontinuous Reception) in WCDMA networks is a value between 6 and 9, thus result-
ing in paging timing cycles between 0.64 and 5.12 seconds. The DRX value of the base station
is assigned by the WCDMA network operator.
Now, a paging timing cycle consists of the actual fixed length paging plus a variable length
pause before the next paging. In the pauses between listening to paging messages, the module
resumes power saving, as shown in Figure 35.
Figure 35: Power saving and paging in WCDMA networks
The varying pauses explain the different potential for power saving. The longer the pause the
less power is consumed.
Generally, power saving depends on the module’s application scenario and may differ from the
above mentioned normal operation. The power saving interval may be shorter than 0.64 sec-
onds or longer than 5.12 seconds.