5G NBIOT LTE Question Answers

Home                 LTE                NB-IoT            5G(NR-NSA)   Hi Guys, today we learn more about PSM in Nb-IoT. if you are new at my blog please go through my  Power Saving Mode (PSM) Part I for more details. How does PSM actually work? ·         A UE is PSM enabled only when it sends T3324 timer in Attach/TAU request.   ·         Power Saving Mode configured by providing T3324 active and T3412 extended timers or by configuring "UE requested" timer values. ·         Network provides two options: accept UE requested values or MME configured values for these timers. ·         When PSM configuration is enabled in the Network, the MME accepts the use of PSM and a UE req...

Home                 LTE                NB-IoT            5G(NR-NSA)   What is PSM in NB-IOT? It is a mode through which the UE notifies the network of its indefinite dormant state. Power Saving Mode (PSM) was introduced in 3GPP Release 12 24.301-5.3.11, to improve battery life of IOT devices. PSM is similar to power-off, with the exception that the UE remains registered with the network and there is no need to re-attach or re-establish the PDN connection. Is UE(device) reachable in PSM? UE is unreachable in PSM for mobile  terminating services. UE(device) is reachable for mobile terminating services only for the period of an Active Time after a mobile originated event like data transfer or signaling.  E.g. After a periodic TAU/RAU procedure. Does PSM support CS domain? / Limitations of PSM...