Page 27 - ITU-T Focus Group IMT-2020 Deliverables

ITU-T Focus Group IMT-2020 Deliverables 2

[REQ] The network architecture for IMT-2020 is recommended to support power saving mode of IoT devices,
if IoT device has equipped with power control functions.

8.3 Ultra-reliable and low latency communication services

8.3.1 Description
The new applications with very low latency and real-time constraints are expected to be prevalent in
IMT-2020 networks: driverless cars, enhanced mobile cloud services, real-time traffic control optimization,
emergency and disaster response, smart grid, e-health, augmented reality, remote tactile control, and tele-
protection are some of the examples.

8.3.2 Requirements

[REQ] The network architecture for IMT-2020 is required to increase service/content availability.
NOTE – Service/content availability can be increased by the ability to replicate content and service functions
and ability of forwarders for short and long term caching. In addition, delay-tolerant networking aspects such
as cache-and-forward is very useful in the last mile where the content objects can be pushed or pulled to/by
the end user based on its wireless conditions opportunistically.
[REQ] The network architecture for IMT-2020 is required to provide efficient signaling protocol or system to
cope with the limitations on the existing mobile systems.
NOTE – There are various signalling procedures which contribute to the end-to-end connectivity
establishment involving all the network components such as radio interface, fronthaul/backhaul and mobile
core network. Besides the transport delay through the network components, the signaling which is basically
accompanied in the beginning of each new session or transmission may give more serious impacts on the
total end-to-end latency.
[REQ] The network architecture for IMT-2020 is required to provide enhanced performance for many diverse
applications.
NOTE – Latency studies carried out on many IMT-Advanced deployed network demonstrate the 3GPP
specifications provide adequate guidelines, while actual IMT-Advanced network performance varies due to
many variables and adjacent ecosystem. Similarly, a network latency model and an end to end latency budget
for services should be studied so that it provides optimal performance for many diverse applications in
IMT-2020 networks.

9 Requirements from network operation points of view

9.1 Network flexibility and programmability
9.1.1 Description

An IMT-2020 network, as an integrated common core network, will be flexible enough to support extremely
variety of requirements in user devices and application services. Therefore, the IMT-2020 network is
envisioned as a network where multiple logical network instances tailored to various requirements can be
created. As a basic feature to realize this, the separation of control and data planes in IMT-2020 network is
needed, which enables the components of an IMT-2020 network to be reconfigured, upgraded or even
replaced easily with those of other vendors. NFV is expected to do a significant role in making the IMT-2020
network more flexible by realizing network components as software components. We should note that the
reality would not allow all the required network functions to be softwarized mainly because of the
performance reason.

The openness given by the separation of control and data planes also makes the network programmable by
controlling/steering traffic depending on user specific requirements and some use-cases.

Network slicing allows the operator to provide dedicated logical networks (i.e., network slices) with customer
specific functionality. A network slice can span all the domains of network, such as transport network
supporting flexible locations of functions, dedicated radio configurations or specific RAT and core network

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