[기고서]PROPOSED REVISION TO QUESTION ITU-R 211-6/3
Motivation of the proposed change
In accordance with Resolution 767 (WRC-15), agenda
item 1.15 was established to consider the identification of spectrum for
land-mobile and fixed service applications in the frequency range 275-450 GHz,
while maintaining the protection of the existing passive services. Related to
the agenda item 1.15, technical and operational characteristics of active
services have been identified, and spectrum needs were studied. Close proximity
mobile systems (such as kiosk systems or ticket gate systems, etc.),
intra-device communications, and wireless links in data centres are typical
applications for the active land-mobile service (LMS). Fixed service (FS) applications (Point-to-point
front-haul and backhaul systems) are also considered as candidate applications
in these frequency bands. Sharing studies of such active systems with passive
services have been conducted, and Report ITU-R SM.[275-450 GHz SHARING] has
been developed. Based on the results of the sharing studies, agenda item 1.15
for WRC-19 was reviewed in the CPM19-2 meeting (February 2019). It is expected
that some part of spectrum in 275-450 GHz frequency range will be allocated to
active service applications.
addition, there exist ITU allocations for active service applications in the
frequency range 100-275 GHz, except the frequency bands listed in the RR No. 5.340.
For the frequency bands in the RR No. 5.149, protection of the
radio astronomy service is required. The Group Specification of the ETSI
Industry Specification Group (ISG) millimetre Wave Transmission (mWT) was
published in 2015 in Europe, to promote the use of millimetre spectrum from 50
GHz up to 300 GHz for present and future critical transmission applications and
use cases. In the US, FCC launched proposals for input regarding the
applications in this frequency range in 2016.
mentioned above, the study on the propagation characteristics in the frequency
bands above 100 GHz becomes very important. However, the upper frequency
limit of current Question ITU-R 211-6/3 is 100 GHz. Therefore, the upper
frequency of Question ITU-R 211-6/3 needs to be extended.
We propose to extend the upper frequency limit of Question ITU-R 211-6/3 up to 450
GHz.  In addition, we propose to extend
the study period to 2023 as well.
Details are shown in the Annex.