ARIB STD-T91
-21-
request by the user. Vendors should voluntarily execute a preliminary survey even if such a
request is not issued.
4 Cooperation
4.1 Cooperation for interference avoidance
In the case that harmful radio interference is caused to radio equipment other than UWB
radio systems, by the use of a UWB radio system manufactured, sold and installed by a vendor,
and that there is a need to discuss a radio interference avoidance measure between the user of
the UWB radio system and the management representative of the interfered radio equipment ,
the vendor shall, in good faith, extend cooperation to avoid the radio interference.
In the case that radio emission was found to cause harmful interference to radio equipment
other than UWB radio systems, after a UWB radio system had started operation, the radio
emission shall be promptly stopped, and an interference avoidance measure shall be taken.
4.2 Cooperation for interference avoidance from January 1, 2009 and later for radio equipment
using radio frequency from 3.4 GHz to 4.8 GHz without interference mitigation function
With respect to future new mobile communications systems, etc., and development of
domestic radio ordinances, vendors shall refrain from manufacturing, selling and installing
UWB radio equipment using the frequency from 3.4 GHz to 4.8 GHz without an interference
mitigation function (hereinafter referred to “radio equipment not supporting mitigation”) from
January 1, 2009 and later.
Also, vendors shall cooperate to assist public organizations to estimate the remaining number
of UWB radio equipment not supporting mitigation, by tracking the number of shipped radio
equipment not supporting a mitigation function as well as the UWB radio equipment using the
same bandwidth with an interference mitigation function (hereinafter referred to “radio
equipment supporting interference mitigation”).
As an appropriate measure to limit the number of remaining UWB radio equipment not
supporting interference mitigation to below an allowed limit in 2011, the vendors shall
cooperate with future mobile communications system operators for an early shift to and
replacement with radio equipment supporting interference mitigation.