Page 144 - ITU Journal, Future and evolving technologies - Volume 1 (2020), Issue 1, Inaugural issue
P. 144
ITU Journal on Future and Evolving Technologies, Volume 1 (2020), Issue 1
Potential
Potential Focusing on Focusing on An Inclusive The Future of
Applications Service Types the Key the Key Perspective A Speci ic
Ref. and
and Key Re- Enablers in Enablers in for the Key Technology
quirements Application General Detail Enablers or Concept
Groups
This work 3 3 3 3
[1] 3 3 3
[3] 3 3
[4–13] 3 3 3
[14] 3 3
[15–21] 3 3
[22,23] 3
[24–28] 3 3 3
[29–39] 3 3
[40–83] 3
Table 2 – Scopes of 6G publications in the literature.
Human-Centric Services (HCS), Multi-Purpose Services Although technologies placed in different categories can
(MPS) in [7]. As it is seen from the names, some of the have overlapped regions, the given categorization dif-
service types (e.g., SuRLLC, uHSLLC, reliable eMMB, ferentiates these technologies regarding their lexibility
MBRLLC, mURLLC, MPS) try to be more inclusive than aspects.
the 5G service types to serve target applications. It is also
possible to see more speci ic service types (e.g., BigCom, Table 3 provides a summary of the example lexibility op-
3D-InteCom, UCDC, LDHMC, ELPC, HCS) in comparison tions achieved by the different technologies. It is worthy
with 5G. to emphasize that the different key enablers have their
own impact on the overall lexibility of the system. Ulti-
The aforementioned applications/services envisioned for mately all of them combine together to provide the com-
6G illustrates the expected richness of its requirements. plete infrastructure capable of realizing the lexible 6G vi-
These diverse requirements necessitate an ultra- lexible sion that we aspire to achieve.
perspective for the incorporation of key enabler technolo-
gies and concepts, described below, in future networks. 3.1 Flexible Multi-Band Utilization
3. ULTRA-FLEXIBLE PERSPECTIVE FOR 6G The inclination of communications technologies towards
high-frequency bands becomes more appealing due to
In this section, an inclusive categorization of promising the increased system capacity and throughput demands
key enablers is presented for 6G communications and of cellular users. Furthermore, lexible usage of available
their example lexibility aspects are discussed in detail. frequency bands, depending on the user and service
Then, several lexibility challenges are provided for 6G. requirements, is envisioned to be an inherent character-
Key enabler categories and their related subcategories istic of future wireless networks [74].
are shown in Fig. 4. Many of these technologies are
either super icially treated or not studied during 5G The millimeter Wave (mmWave) spectrum is starting
standardizations, such as Integrated Sensing and Com- to be exploited in 5G. It provides new bene its, such as
munications (ISAC) and intelligent communications. multi-gigabit data rates and reduced interference, how-
ever, the use of mmWave bands in 5G is limited by the
APPLICATIONS current International Mobile Telecommunications (IMT)
Each service type regulations. In World Radiocommunication Conference
has unique Applications are 2019 (WRC-19), additional 17.25 GHz of spectrum is
requirement sets mapped to
for application groups requirements identi ied for IMT, where only 1.9 GHz of bandwidth
was available before [85]. Therefore, it is expected that
spectrum availability in these bands and consequently
its lexible utilization will increase during the upcoming
SERVICE TYPES REQUIREMENTS years [42]. Moreover, beyond 52.6 GHz communications
is one of the agenda items for 3GPP Release 17 [86].
Requirements are grouped
under the service types
Frequency bands from 100 GHz to 3 THz are envisioned
Fig. 3 – A basic relationship between the applications, requirements, as a candidate spectrum for 6G communications [40]. If
and service types. THz communications is employed in 6G, it promises a way
124 © International Telecommunication Union, 2020