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Cinterion
®
TX62-W(-B/-C)/TX82-W Hardware Interface Description
3.3 Power Saving
109
t TX62-W_TX62-W-x_TX82-W_HID_v01.000 2021-05-19
Confidential / Preliminary
Page 86 of 154
3.3.3.3 3GPP PSM Configuration
TX62/TX82 can be configured to use 3GPP PSM to reduce power consumption. PSM is similar
to power off, while TX62/TX82 remains registered with the network. There is no need to re-
attach or re-establish PDN connections. TX62/TX82 in PSM is not immediately reachable for
mobile terminating services (see also SUSPEND mode in Section 3.3.1.2)
The network accepts and negotiates the use of PSM by providing specific values for periodic
TAU cycles (T3412) as well as an active timer (T3324). Upon expiry of the active timer, or if the
value provided by the network is zero, TX62/TX82 may activate PSM.
Note: If TX62/TX82 negotiates to enable both PSM (requesting an active timer and possibly a
periodic TAU cycle value) as well as eDRX (requesting a specific extended idle mode DRX
cycle value and possibly a paging time window), it is up to the network to decide whether to:
1. Enable only PSM, i.e. not accept the request for eDRX.
2. Enable only eDRX, i.e. not accept the request for an active timer.
3. Enable both PSM (i.e. negotiate and provide requested PSM timers) and eDRX (i.e. negoti-
ate and provide extended DRX parameters).
Figure 46 shows the module’s eDRX and PSM timings for the third case where module and
network negotiate PSM and eDRX simultaneously (for eDRX see also Section 3.3.3.2). For the
second case the module will not reach SUSPEND mode and will continue with the eDRX pag-
ing cycles. For the first case the module will not extend the DRX paging cycles, but will continue
with the DRX paging cycles until the active timer (T3324) expires.
Figure 46: eDRX/PSM based paging and power saving in LTE Cat M1 or Cat NB1/2 networks
TX62/TX82 monitors paging message only while the active timer (T3324) has not expired. If
the module has uplink data or signal, it will not change to PSM.
The active timer (T3324) and periodic tracking area update (TAU) timer (T3412) can be nego-
tiated/requested with AT+CPSMS. For more information on this AT command see [1].
PeriodicTA Ucycle (T3412)
PCL PCL
3GP P PSM mode
(SUSPEND)
Activetim e (T3324)
PTW
Default
Paging
Cycle
(DRX)
DRXSL EEP  mode
eDRXSLEEP mode
(“deepsleep“)
eDRXSLEEP mode
(“deep sle e p“)
PeriodicTAU cy cl e T3412
Activetime T3324
PCL PagingCycleLeng theD R X  (5.1 2...1 0 4 85.76seconds)
PTW PagingTimeWindoweD R X ( 2.56...40.96 seconds)
DefaultPagingCycle PagingCycleDRX ( 1.28...10.24seconds )
3GPPPSM 3GPPPowerSavingMode
P1 P2 P3 P4
eDRXSUSP END  mode eDRXSU SP END  mode