Page 25 - ITU-T Focus Group IMT-2020 Deliverables

ITU-T Focus Group IMT-2020 Deliverables 2

7.8 Optimization

The IMT-2020 network should provide sufficient performance by optimizing network equipment capacity
based on service requirement and user demand.
The IMT-202 network is recommended to provide dynamic data routing mechanisms that respond to
changing conditions of network segments.

7.9 Reliability and security
The IMT-2020 network should be designed, operated, and evolved with reliability and resilience, considering
congestion and disaster conditions, and to be designed for safety and privacy of their users.

7.10 Energy efficiency
The IMT-2020 network should be designed to reduce UE power consumption and to improve energy
efficiency in overall network operation.
In IMT-2020 network, device-level, equipment-level, and network-level technologies should cooperate with
each other in achieving a solution for network energy savings.

The architecture of 5G is based on a large number of small cell’s densification. One of the major problems
with this architecture is the increase in the amount of signalling needed which can reduce the data capacity
considerably - it has been suggested by as much as 25%. In addition to this, the base station signalling
contributes to the overall energy usage within the system and prevents achievement of the energy reduction
KPI’s for 5G. In order to address this concept of splitting the control (C) plane from the data (U) plane has
been proposed such that the C plane can be delivered via an overlay macro cell. In this architecture, the base
station just delivers data on the U plane saving capacity and energy. One proposal is to make the macro cell
a satellite cell so that the terrestrial spectrum can be saved. Energy efficiency has been identified as an
important metric for 5G. It has been demonstrated that significant reduction in overhead is achieved with
the integrated architecture since the U-plane’s frame structure can be optimized to suit the local
environment.

8 Requirements from service points of view

8.1 Enhanced mobile broadband services
8.1.1 Description

More and more user devices are being equipped with enhanced media consumption capabilities, such as
Ultra-High Definition display, multi-view High Definition display, mobile 3D projections, immersive video
conferencing, and augmented reality and mixed reality display and interface. This will all lead to a demand
for significantly higher data rates in IMT-2020.
The demand for mobile high-definition multimedia also keeps increasing in many areas beyond
entertainment, such as medical treatment, safety, and security, which is well reflected to the performance
targets for connection density and area traffic capacity in ITU-R Recommendation M.2083-0.

8.1.2 Requirements

[REQ] The network architecture for IMT-2020 is recommended to make IMT-2020 network more flexible and
resilient with enhanced capabilities including the upgrades of session or bearer management, more efficient
multicast methods, distributed function deployment, network slice, and efficient codecs.
NOTE – Current network architecture is not appropriate to support various bandwidth demands, from ultra-
high to extremely low, required for IMT-2020 and beyond.
[REQ] The network architecture for IMT-2020 is recommended to eliminate the needs for separate local
mobile specific gateways, additional APN and associated signaling.

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