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Content for  TS 23.401  Word version:  19.1.0

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L Optimised EPS Architecture option for CIoT  L.1 Introduction  L.2 Non-Roaming Architecture  L.3 Roaming architecture  L.4 C-SGN 
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L  Optimised EPS Architecture option for CIoT |R13|  p. 450

L.1  Introduction  p. 450

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 described in clause 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.
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L.2  Non-Roaming Architecture  p. 450

Reproduction of 3GPP TS 23.401, Fig. L.2-1: Optimised EPS architecture option for CIoT - Non-roaming architecture
Figure L.2-1: Optimised EPS architecture option for CIoT - Non-roaming architecture
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L.3  Roaming architecture  p. 451

Reproduction of 3GPP TS 23.401, Fig. L.3-1: Optimised EPS architecture option for CIoT - Roaming architecture
Figure L.3-1: Optimised EPS architecture option for CIoT - Roaming architecture
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L.4  C-SGN  p. 451

The C-SGN (CIoT Serving Gateway Node) is a combined node EPC implementation option that minimizes the number of physical entities by collocating EPS entities in the control and user planes paths (e.g. MME, S-GW, P-GW), which may be preferred in CIoT deployments. The external interfaces of C-SGN implementation option are the interfaces of the respective EPC entity supported by the C-SGN, such as MME, S-GW, and P-GW.
A C-SGN supports sub-set and necessary functionalities compared with the existing EPS core network elements and also supports at least some of the following CIoT EPS Optimisations:
  • Control Plane CIoT EPS Optimisation for small data transmission.
  • User Plane CIoT EPS Optimisation for small data transmission.
  • Necessary security procedures for efficient small data transmission.
  • SMS without combined attach for NB-IoT only UEs.
  • Paging optimisations for coverage enhancements.
  • Support for non-IP data transmission via SGi tunnelling and/or SCEF.
  • Support for Attach without PDN connectivity.
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