8.4 PSM in between eDRX script
Within the eDRX modality the modules can activate a proprietary powersave mananagement
to fully enhance eDRX power consumptions when eDRX cycle is greater that a specific value
(tipically above 2-3 minutes).
The solution is using “PSM power state” in between eDRX PTWs in order to lower the current
consumption to 3uA.
Since the module is practically OFF a tiny boot process is needed before being ready for the
Paging Time Window, this is accomplished with an anticipated wakeup.
To be noted that this modality doesn’t actually activate standard 3GPP PSM, this
solution just take advantage of the PSM power state of 3uA in between eDRX, i.e. when
module is not in the active paging task window.
When PSM in between eDRX is activated the AT modem interface is not available. The module
can be awakened at every time by using ON_OFF line.
Differently from standard eDRX this proprietary modality cannot be combined with PSM (as
shown in figure 8.1) and needs a specific command plus a reboot to take effect.
The feature is available on ME910G1, ML865G1 and ME310G1.
Here below a simple script to perform PSM inbetween eDRX. The test is performed using a
network simulator but the same can be applied on live network.
AT+CEREG?
+CEREG: 0,1
OK
AT+COPS?
+COPS: 0,0,"Test 001 01",8 The module is registered to CAT M test network
OK
AT#RFSTS
#RFSTS: "001 01",1575,-85,-65,-3.0,0001,00,,256,3,0,0000100,"001012345678901","Test
001 01",3,3,720,3240,249
OK
AT#CPSMS=1,,,90,20,8,60 PSM in between eDRX mode is activated with a
PSM threashold of 60 sec
Before giving this command be sure PSM is disabled (#CPSMS: 0).
When
using
PSM
in
between
eDRX,
<psmThre
shold>
has
the
follwi
ng
meaning
:
PSM
in
between eDRX will be activated if assigned (eDRX cycle – PTW) > psmThreshold. Otherwise
standard eDRX is activated.
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