The EPS Optimised for CIoT includes the support of the following characteristics:
Ultra low UE power consumption.
Large number of devices per cell.
Narrowband spectrum RATs.
Enhanced coverage level.
The EPS Optimised for CIoT supports traffic patterns that is different as compared to the normal UEs and may support only sub-set and necessary functionalities as compared with the existing EPS.
An EPS Optimised for CIoT can be enabled by having sub-set of functionalities implemented in single logical entity C-SGN (CIoT Serving Gateway Node). C-SGN is decribed in L.4. Mobility and Attach procedures are performed as described in other clauses for corresponding entities MME, S-GW and P-GW.
The Core Network node involved in the EPS Architecture optimised for CIoT can be deployed as DCNs within a PLMN.