Annex 1�
A methodology for co-channel interference evaluation to determine separation distance from a system using HAPS to a cellularsystem
to provide� IMT-2000 service within the
boundary of an administration
�1���� Introduction
�2���� System model
������� 2.1���� HAPS IMT-2000
������� 2.2���� Propagation model
����������������� 2.2.1���� Simplified model of an
extended version of Hata�s model
����������������� 2.2.2���� Free space loss model
�3���� C/I analysis at a cellular mobile station and the
required C/I to determine the separation distance between HAPS
system and cellular system
������� 3.1���� C/I analysis at a cellular mobile station
������� 3.2���� The required C/I
to determine the separation distance
Annex
2� Example of calculation of separation
distance between a HAPS system and a cellular system to provide IMT-2000
service
�1���� Parameters for C/I
calculation
�2���� Calculation of
separation distance
Appendix 1
to Annex 1� Derivations of the
interference between a HAPS system and a cellular system
�1���� Interference to a
cellular mobile station
������� 1.1���� Interference from a
cellular base station
������� 1.2���� Interference from a
HAPS base station
Appendix 2
to Annex 1� Antenna radiation patterns
�1� ���Reference radiation pattern used (Recommendation ITU-R M.1456)
�