@Herr-Bruns,
Sorry for my long silence!
I just wanted to inform you that eDRX has eventually been enabled a few weeks ago and is available across our complete LTE-M network.
Please let me know if you have any questions when testing this feature.
Kind regards,
Ronan Lacroix

@inka-O,

As stated above, we will implement eDRX for LTE-M beginning of next year, but we cannot tell you exactly when right now (our current target is Q1 2021). As far as we know, most of the other European LTE-M operators haven’t yet enabled eDRX neither, but also plan to deploy it next year. eDRX does not exist in 2G, only in LTE, and deployed primarily (if not exclusively) in its Low-Power Wide-Area categories (i.e. LTE-M and NB-IoT). PSM is supported in all of DT’s LTE-M networks as well as in all of our roaming partner networks. Like eDRX, PSM has only been standardized in LTE networks and is not available for 2G.

Best regards,

Ronan

Hi Frank,

WUS and other 3GPP Release 15 features aren’t yet supported in the DT networks and to our knoweldge in most other Operator networks.
Our focus is right now on completing the roll-out of key features like eDRX, while in parallel planning the introduction of new Rel. 14 features like New Category NB2.
WUS and other important Rel. 15 features are of course already on our Roadmap, unfortunately we cannot give you a concrete date when those will be deployed in the our networks yet.
Can’t eDRX to a certain extent address your power saving requirements for the time being?

Best regards,

Ronan

@lorenz
Dear Lorenz,
Thanks a lot for the feedback and I’m glad to see eDRX is delivering its promise on energy saving!
Another tip maybe: please consider setting your preferred Periodic TAU Timer to save further energy.
This can be done without setting any PSM activity timer with the CPSMS command, with a TAU-timer of up to 310 hours.
To enable Long-Periodic TAU without PSM, use value “11100000” for parameter <Requested_Active-Time>.
Best regards,
Ronan

NB-IoT has three power saving features:

PSM (Power Saving Mode): Puts radio module into sleep mode to save power. When a power saving feature is active, it is not possible to initiate a downlink connection from the server to the device. It can only be woken up by a timer or own sensors. Upon wake-up, since the data session (PDP context) stays valid, no energy is needed to re-register (re-attach) the device at the network. Long Periodic TAU (LP-TAU): Extends the standard sleeping interval by setting a long TAU (Tracking Area Update) period. eDRX: Useful if frequent paging (“listening”) is required. By switching off the receive section of the radio module for few seconds or more, the UE is able to save power. Whilst not providing the same levels of power reduction as PSM, eDRX may provide a good compromise between device reachability and power consumption.