DATA transfer in NBIOT & What is CIoT EPS Optimisations?

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Hi Guys today we are learning about  Types of DATA transfer in NB-IoT and CIoT EPS optimization in detail for NB-IoT, For more update Please visit our NB-IoT page.



What is attach with PDN for NB-IoT?

As part of the attach procedure, the device is required to establish the PDN connection. This is the case with all 3GPP EPS (Evolved Packet System) releases up to Rel-13.

What is attach without PDN for NB-IoT?

Consider a scenario where a huge numbers of devices keep a connection inactive for very long period of time and seldom transmit data over it. Keeping this scenario in mind, a new capability had been introduced in 3gpp Rel-13 which allows UEs supporting CIoT optimizations to remain attached without PDN connection.

A UE attached without PDN connection only has SMS service available for any data transmissions. All of its applications are within the constraints of this capability. A PDN connection establishment can also be triggered by SMS.

Types of DATA transfer in NBIOT


Data over NAS :

Through this mechanism, small amounts of data can be transferred efficiently in 3GPP systems by using signaling plane. Both IP and non-IP data can be transferred over NAS. Non-IP Data delivery (NIDD) further optimizes transfer of small data. 
UL data is first transferred from the eNodeB to MME. From there it can be transferred via the S-GW/P-GW (SGi) or the SCEF. DL data is also transmitted over the same paths in the reverse direction.

 IP and non-IP Data Delivery over SGi:

Small data can be delivered via SGi for both IP and non-IP PDN. UL data is transferred from the eNodeB to MME and from there to S-GW and P-GW. DL data is also transmitted over the same paths in the reverse direction.

 Non-IP Data Delivery over SCEF:

A new node called SCEF has been added for machine type data communication and it supports delivery of non-IP data over Control Plane. For Non-IP small data transfer over SCEF an interface called T6a is added between MME and SCEF in the existing EPC architecture.

CIoT EPS Optimisations

Cellular IoT EPS optimization is a method of improving the support of small data transfers.

The IoT devices most commonly use Machine-Type-Communication (MTC), and have a wide spectrum of capabilities with varied devices. The number of MTC devices is increasing rapidly and using the existing LTE technology for transmitting data of these IoT devices would lead to a network overload. Though the user data transmitted is small, amount of signaling remains the same.

Two optimizations for the cellular internet of things (CIoT) in the evolved packet system (EPS) were defined in order to send data to an application:

·         UserPlane CIoT EPS optimisation
·        ControlPlane CIoT EPS optimization





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