@Ronan-Lacroix I have a question: The min value for T3412 is only valid for the “extended” version of TAU ? Does the 1 hour apply also to the min. value of standard TAU or is it shorter?
Having a min TAU of 1 hour seems to me for many use cases difficult because the devices in those use cases need to wakeup from sleeping much more often (e.g. every 10 minutes).
Release announcement: Activation of NB-IoT network features
Dear IoT Community,
please note that we will soon be activating new features, as well as will update the configuration of already available features in the NB-IoT network. With the transition, you’ll be able to manage your NB-IoT devices even more flexibly and efficiently. The activation is currently planned for beginning of November and will affect our networks in Austria, Czech Republic, Germany and the Netherlands.
The changes at a glance:
• Switch to dynamic Power Saving Mode (PSM) - the network will now accept the values suggested by devices
• Switch to dynamic (long-periodic) Tracking Area Update (TAU/LP-TAU) - the network will now accept the values suggested by devices
• Introduction of Data Packet Buffering - the network will buffer up to 10 data packets for the sleeping devices in the PSM
If you already use PSM and / or TAU / LP-TAU, then please note that your devices may behave differently than usual after activating the network functions. We recommend checking the settings on your devices.
If you have questions, don’t hesitate to ask in our IoT Forum!
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.