MIIT129-2021 PDF in English
MIIT129-2021 PDF English
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MIIT129-2021: PDF in English MIIT129-2021
Order of Ministry of Industry and Information Technology of
the People’s Republic of China
MIIT [2021] No.129
In order to maintain the order of airwaves and promote the development of the
radio industry, in accordance with the Radio Management Regulations of the
People's Republic of China and the Radio Frequency Allocation Regulations of
the People's Republic of China, and with reference to the Radio Regulations of
the International Telecommunication Union, the following matters concerning
strengthening and standardizing radio management in the 2400-2483.5MHz,
5150-5350MHz and 5725-5850MHz frequency bands (hereinafter referred to as
the 2400MHz, 5100MHz and 5800MHz frequency bands, respectively) are hereby
notified:
Notice of the Ministry of Industry and Information
Technology on Strengthening and Standardizing Radio
Management in the 2400MHz, 5100MHz and 5800MHz
Frequency Bands
Article 1 The 2400MHz, 5100MHz and 5800MHz frequency bands are allocated
to one or more radio services, such as fixed, mobile, radio positioning, satellite
fixed, satellite Earth exploration, satellite radio determination, space research, etc.
The 2400MHz and 5800MHz frequency bands are also designated for non-radio
equipment that radiates radio waves, such as industrial, scientific and medical
(ISM) applications that generate radio frequency energy. No radio station or
equipment may exclusively use the frequencies in the 2400MHz, 5100MHz and
5800MHz frequency bands.
Article 2 According to the corresponding mobile or fixed service radio frequency
division, the 2400MHz frequency band can be used for radio communication
systems such as broadband wireless access (including wireless LAN), Bluetooth,
and point-to-point transmission; the 5100MHz frequency band can be used for
radio communication systems such as broadband wireless access (including
wireless LAN), however, it is limited to indoor use (not including in cars); the
5800MHz frequency band can be used for radio communication systems such as
broadband wireless access (including wireless LAN), point-to-point transmission,
and electronic non-stop toll collection.
Article 3 The radio frequency unit and antenna of radio transmitting equipment
operating in the 2400MHz, 5100MHz and 5800MHz frequency bands must be
designed and produced in an integrated or synchronously matched manner. It is
not allowed to use other antennas or add additional radio frequency power
amplifiers without authorization. The transmitting equipment shall comply with the
technical requirements listed in the appendix (see Appendix 1 and Appendix 2)
and obtain the radio transmitting equipment type approval certificate in
accordance with the law (except for micro-power short-range radio transmitting
equipment).
Article 4 In order to achieve compatible coexistence with other business
frequencies such as radio positioning, radio transmission equipment operating in
the 5250-5350MHz frequency band shall adopt transmit power control (TPC) and
dynamic frequency selection (DFS) interference suppression technology, and the
function option of turning off DFS shall not be set. The TPC range shall be no less
than 6dB; if there is no TPC function, the equivalent isotropic radiated power and
equivalent isotropic radiated power spectral density limits shall be reduced by 3dB
compared with the corresponding limits listed in the appendix.
In order to achieve compatible coexistence of different radio service frequencies,
radio transmitting equipment operating in the 2400MHz, 5100MHz and 5800MHz
frequency bands shall comply with one of the interference avoidance technical
requirements listed in Appendix 2.
Wireless LAN devices with public network IP address allocation function shall
support IPv6 protocol and enable IPv6 address allocation function by default. For
wireless LAN devices with special national requirements for information security,
the air interface access control security capability shall also comply with GB 15629
national wireless LAN security series standards.
Article 5 Where wireless LAN access points (APs), broadband wireless access
system central stations, and point-to-point transmission radio stations are set and
used, and the following conditions are met at the same time, a radio station license
shall be applied from the local radio management agency of the province,
autonomous region, or municipality directly under the central government:
(I) Deployed in outdoor environment;
(II) The equivalent isotropic radiated power of radio transmitting equipment
operating in the 2400MHz frequency band shall be greater than 20dBm; the
equivalent isotropic radiated power of radio transmitting equipment operating
in the 5800MHz frequency band shall be greater than 30dBm.
In addition to meeting the above conditions, other radio transmitting equipment
and radio stations setting and using the 2400MHz, 5100MHz and 5800MHz
frequency bands shall be managed in accordance with the terrestrial public mobile
communication terminals and no radio station license is required.
Article 6 The radio management agencies of all provinces, autonomous regions,
and municipalities directly under the central government shall actively promote
the online processing of relevant radio station licenses and other matters to
improve the convenience of government services.
Article 7 The radio stations setting and using the 5100MHz frequency band shall
be more than 3 km away from earth stations that legally use satellite radio
determination (air-to-ground) services and satellite fixed (air-to-ground) services
in the same frequency band. Relevant satellite earth stations shall have obvious
signs at road intersections within 3 km to indicate that the setup and use of radio
stations in the 5100MHz frequency band is prohibited.
Article 8 When radio stations operating in the 2400MHz, 5100MHz and 5800MHz
frequency bands and holding radio station licenses in accordance with the law are
subject to harmful radio interference, report to the local radio management agency
for coordination and resolution in accordance with the principle of "out-of-band
services give way to within-band services, secondary services give way to primary
services, later users give way to earlier users, and the unplanned give way to the
planned".
Article 9 In principle, radio stations operating in the 2400MHz, 5100MHz and
5800MHz frequency bands that do not require a radio station license cannot make
claims for protection from harmful interference. If they cause harmful interference
to other radio stations that legally hold radio station licenses in the same or
adjacent frequency bands, they shall be ceased immediately and may only
continue to be used after efforts have been made to eliminate the harmful
interference.
Radiocommunication services operating in the 2400MHz and 5800MHz bands
shall also be subject to interference from ISM applications.
Article 10 When there are major national tasks or the state implements radio
control, the setup and use of radio stations, radio transmitting equipment and non-
radio equipment radiating radio waves in the 2400MHz, 5100MHz and 5800MHz
frequency bands must comply with the radio management regulations issued
during the major national tasks, or obey the radio control orders and radio control
instructions issued by the state.
Article 11 Micro-power short-range radio transmitting equipment in the 2400MHz
and 5800MHz frequency bands shall be implemented in accordance with the
relevant provisions of Announcement No. 52 of 2019 of the Ministry of Industry
and Information Technology.
Article 12 The setup and use of radio stations and radio transmitting equipment
in the 2400MHz, 5100MHz and 5800MHz frequency bands shall also comply with
the relevant regulations of other industry regulatory authorities.
Article 13 From October 15, 2023, applications for model approval of radio
transmitting equipment must be carried out in accordance with the technical
requirements listed in this notice.
Article 14 The relevant requirements of this notice shall come into effect on
January 1, 2022. If any previous relevant regulations are inconsistent with this
notice, this notice shall prevail.
Attachment:
1. Radio frequency technical requirements for radio transmission equipment in the
2400MHz, 5100MHz and 5800MHz frequency bands
Attachment 2
Technical requirements for interference avoidance of radio
transmission equipment in the 2400MHz, 5100MHz and
5800MHz frequency bands
I. Technical requirements for interference avoidance of radio transmission
equipment in the 2400MHz band based on the “pre-emission search”
mechanism
(I) Radio transmission equipment based on frequency hopping technology
1. The equipment shall assess the channel availability before transmitting on the
intended channel frequency. The idle channel assessment time before
transmission shall not be less than 0.2% of the channel occupancy time and shall
not be less than 16 μs.
2. After the equipment finds that the channel frequency is occupied, it can execute
the following channel access method.
(1) Jump to other available frequencies immediately before the dwell time ends.
(2) After the equipment finds that the channel frequency is occupied, it can keep
using the frequency during the remaining dwell time and re-perform the idle
channel assessment. If the idle channel assessment determines that the channel
frequency is no longer occupied, the frequency hopping frequency can continue
to be reused; if it is still occupied, the idle channel assessment shall continue until
the channel frequency is no longer occupied.
(3) After discovering that the channel frequency is occupied, the equipment may
continue to transmit short-time management control signaling signals (short
control signaling signals), and the duty cycle of the short control signaling signals
shall be less than or equal to 10%.
3. Channel occupancy time: The total time required for the equipment to transmit
on a given channel frequency without re-evaluating the availability of the channel
frequency. This time shall be less than 60ms.
4. Channel idle time: at least 5% of the channel occupancy time and not less than
100μs.
5. Detection threshold:
than 1ms and no more than 10ms. Equipment with a fixed frame period can also
adjust the duration of the frame period which, however, shall not exceed
200ms/time.
2. For equipment based on a fixed frame period, signal transmission is only
allowed after the fixed frame starts, and an idle channel assessment shall be
performed before preparing for transmission. The idle channel assessment time
before transmission shall be no less than 16μs. If a signal higher than the
detection threshold is found on the intended frequency, the equipment shall not
transmit on that frequency in the next fixed frame period, but the equipment is
allowed to perform short control signaling signal transmission on that channel
frequency (see requirements in Clause 5 for details). Otherwise, the frequency
can be used normally. If the equipment supports transmission on multiple
channels at the same time, the equipment can continue to transmit on other
working channels, provided that idle channel assessment have been performed
on other working channels and no occupation has been found.
3. The maximum channel occupancy time of equipment based on the frame
structure technology system shall be less than or equal to 95% of the fixed frame
period. After the channel occupancy time and before the start of the next fixed
frame period, a channel idle period shall be reserved, and the duration of the
channel idle period shall be at least 5% of the channel occupancy time and not
less than 100μs.
4. The equipment can have multiple transmissions within a channel occupancy
time. If the interval between the relevant transmission sequences does not exceed
16μs, there is no need to perform additional idle channel assessment on this
working channel. If the interval exceeds 16μs, the equipment must perform an
additional idle channel assessment and continue to use the working channel after
finding that the channel is not occupied.
5. Short control signaling signals are used to send management and control frame
transmissions. It is required that within the 50ms observation period, the number
of short control signaling signal transmissions of the equipment shall be less than
or equal to 50 times. Moreover, within the above observation period, the total time
of the short control signal transmission of the equipment shall be less than 2500μs;
alternatively, the duty cycle of the short control signal transmission signal shall not
be greater than 10%.
6. After receiving the transmission authorization from the network initialization
equipment associated with it, if the network access equipment transmits a signal
within 16μs after the end of the last transmission sequence of the network
initialization equipment, it can continue to transmit signals on the current working
channel without re-performing the idle channel assessment of the channel;
otherwise, the network access equipment shall re-perform the idle channel
assessment of the working channel before transmission.
7. The detection threshold is not greater than -75dBm/MHz.
(II) Radio transmission equipment based on load
1. Equipment based on the transmission load technology system shall conduct
idle channel assessment before preparing to transmission. The idle channel
assessment time before transmission shall be no less than 25μs. If a signal higher
than the detection threshold is found on the intended frequency, the equipment
shall stop transmitting immediately, but the equipment is allowed to perform short
control signaling signal transmission on the channel frequency (see requirements
in Clause 4 for details). Otherwise, the channel frequency can be used normally.
2. The channel occupancy time includes one or more transmissions of the network
initialization equipment and zero or more transmissions of one or more network
access devices. The maximum channel occupancy time shall not exceed 20ms.
3. Equipment based on the transmission load technology system can work on
multiple adjacent or non-adjacent channels at the same time. Before the
transmission, the equipment shall conduct an idle channel assessment for at least
25μs for each channel frequency to be used. If it is found that the channel is not
occupied, it can combine and use any combination or group of 20MHz
independent working channels.
4. Short control signaling signals are used to send management and control frame
transmissions. It is required that within the 50ms observation period, the number
of short control signaling signal transmissions of the equipment shall be less than
or equal to 50 times. Moreover, within the above observation period, the total time
of the short control signal transmission of the equipment shall be less than 2500μs;
alternatively, the duty cycle of the short control signal transmission signal shall not
be greater than 10%.
5. After receiving the transmission authorization from the network initialization
equipment associated with it, if the network access equipment transmits a signal
within 25μs after the end of the last transmission sequence of the network
initialization equipment, it can continue to transmit signals on the current working
channel without re-performing the idle channel assessment of the channel;
otherwise, the network access equipment shall re-perform the idle channel
assessment of the working channel before transmission.
6. The detection threshold is not greater than -75dBm/MHz.
IV. Technical requirements for interference mitigation based on other
mechanisms
Technical requirements for interference mitigation based on the "equivalent
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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