The Ministry of Information and Communication (MIC) of Vietnam has published a Draft Circular on Radio frequency channel allocation planning for Fixed service in the 71-76 GHz and 81-86 GHz bands on October 25, 2024. The Draft may be accessed here and will be open for comments until December 25, 2024.

 

CIRCULAR

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71 - 76 GHz and 81 - 86 GHz bands

 

 

Pursuant to the Law on Radio Frequencies dated November 23, 2009; Law amending and supplementing a number of articles of the Law on Radio Frequencies dated November 9, 2022;

 

Pursuant to Decree No. 48/2022/ND-CP dated July 26, 2022 of the Government stipulating the functions, tasks, powers and organizational structure of the Ministry of Information and Communications;

 

Pursuant to Decision No. 71/2013/QD-TTg dated November 21, 2013 of the Prime Minister promulgating the National Radio Frequency Spectrum Planning; Decision No. 38/2021/QD-TTg dated December 29, 2021 of the Prime Minister amending and supplementing a number of articles of Decision No. 71/2013/QD-TTg dated November 21, 2013 of the Prime Minister promulgating the National Radio Frequency Spectrum Planning; Decision No. 15/2024/QD-TTg dated October 4, 2024 of the Prime Minister amending and supplementing a number of articles of Decision No. 71/2013/QD-TTg dated November 21, 2013 of the Prime Minister promulgating the National Radio Frequency Spectrum Planning, amended and supplemented a number of articles under Decision No. 38/2021/QD-TTg dated December 29, 2021 of the Prime Minister.

 

At the request of the Director of the Radio Frequency Department,

 

The Minister of Information and Communications issued a Circular on Radio Frequency Channel Allocation Planning for Fixed Service in the 71-76 GHz and 81-86 GHz bands.

 

Article 1. Scope of regulation and applicable subjects

 

1. This Circular plans the allocation of radio frequency channels for the Fixed service in the 71-76 GHz and 81-86 GHz bands.

 

2. This Circular applies to organizations and individuals participating in the management and use of radio frequencies and equipment, and the production, import, and trading of radio equipment for use in Vietnam in the fixed service of the 71-76 GHz and 81-86 GHz frequency bands in Vietnam;

 

3. Radio equipment exempted from radio frequency license is not within the scope and subject of application of this Circular.

 

Article 2. Interpretation of terms

 

In this Circular, the following terms are construed as follows:

 

1. Fixed Service is a radiocommunication service between predetermined fixed points.

 

2. Radio frequency channel (hereinafter referred to as frequency channel) is a radio frequency band defined by the width and center frequency of the frequency channel or other characteristic parameters.

 

3. Frequency channelization is the arrangement of frequency channels in the same frequency band, determined by basic parameters including center frequency, distance between two adjacent channels, and transmission and reception frequency spacing.

 

4. Full duplex is an operation method in which transmission is performed simultaneously in both directions of an information channel.

 

5. Frequency Division Duplex (FDD) is a duplexing method in which uplink and downlink transmission use two separate frequencies.

 

6. A microwave system is a radio communication system in the Fixed Service operating in the frequency band above 30 MHz, using tropospheric propagation and normally consisting of one or more relay radio stations.

 

7. Point-to-point communication (applicable to microwave systems) is a communication line between two radio stations located at two fixed points.

 

Article 3. Planning content

Radio frequency channel planning for Fixed service in the 71 - 76 GHz and 81 - 86 GHz bands is specified in the Appendix issued with this Circular.

 

Article 4. Implementation provisions

 

1. This Circular takes effect from date month year ……

 

2. The Chief of Office, Director of the Department of Radio Frequency, Heads of agencies and units under the Ministry of Information and Communications and relevant organizations and individuals are responsible for implementing this Circular.

 

3. During the implementation process, if there are any difficulties or problems, please promptly report them to the Ministry of Information and Communications (Radio Frequency Department) for consideration and resolution./.

 

Appendix

RADIO FREQUENCY CHANNEL ALLOCATION PLANNING FOR FIXED SERVICES IN THE 71-76 GHz and 81-86 GHz BANDS

 

(Issued together with Circular No. …./…./TT-BTTTT dated …/…/…
of the Minister of Information and Communications)

 

1. General provisions

For a microwave system using frequency division duplexing-FDD technique, the frequency channelization diagram is illustrated as shown below:

The center frequencies of the corresponding receiving and transmitting radio frequency channels are calculated according to the following formulas:

f _n = f _r + a + nX  (MHz)

f _n ' = f _n + p = f _r + (a+P) + nX    (MHz) with n = 1, 2, 3,...

 

In there:

f _r is the reference frequency (MHz);

a is a constant (MHz);

P is the transmit-receive frequency distance (MHz);

f _n is the center frequency of a transmit/receive channel (MHz);

f _n ' is the center frequency of a corresponding transmit/receive channel (MHz).

 

b) In cases where it is necessary to use high-capacity microwave systems requiring large bandwidth, adjacent channels can be multiplexed with the center frequency being the frequency located in the middle of the center frequencies of those adjacent channels.

 

c) Other provisions in the channel diagram include:

 

The center frequencies f ₁ , f ₂  , f ₃ ...f _n and f ₁ ', f ₂ ', f ₃ '...f _n ' are shown on the frequency distribution diagram.

 

Reference document: International Telecommunication Union Frequency Allocation Recommendation.

 

Intended use: Specifies the type of system that is allowed to be used.

 

Formula for calculating the center frequency of frequency channels.

 

Special provisions on the conditions for assigning and using frequency channels in the frequency channel allocation scheme.

 

Center frequency table of frequency channels: Lists all center frequency values of the corresponding frequency channels illustrated on the frequency channeling diagram and calculated using the center frequency calculation formula.

 

2. Frequency channel allocation for the Fixed Service in the bands 71-76 GHz and 81-86 GHz

 

2.1. 250 MHz base channel

References:

Based on Annex 2, Recommendation ITU-R F.2006 (March 2012) of the International Telecommunication Union.

Regulations:

• Intended use: point-to-point microwave communication systems using frequency division duplex (FDD) multiplexing technique.

• Basic channel division: 250 MHz

• Formula for calculating the center frequency of frequency channels:

f _n = f _r + 250n (MHz)                    f _r = 71000 MHz

f _n ' = f _n + 10000 + 250n (MHz)          n = 1, 2, 3,... 19

• Minimum transmission distance : Optional. 

 

Center frequency table of frequency channels

Channel Width (MHz)	Channel	Transmit/Receive Frequency (MHz)	Transmit/Receive Frequency (MHz)
250	1	71250	81250
	2	71500	81500
	3	71750	81750
	4	72000	82000
	5	72250	82250
	6	72500	82500
	7	72750	82750
	8	73000	83000
	9	73250	83250
	10	73500	83500
	11	73750	83750
	12	74000	84000
	13	74250	84250
	14	74500	84500
	15	74750	84750
	16	75000	85000
	17	75250	85250
	18	75500	85500
	19	75750	85750

 

2.2. Expanded channel

References:

Based on Annex 2, Recommendation ITU-R F.2006 (March 2012) of the International Telecommunication Union.

Regulations:

• Intended use: point-to-point microwave communication systems using frequency division duplex (FDD) multiplexing technique.

• The extended channel is multiplexed from consecutive 250 MHz base channels limited to a maximum bandwidth of 2000 MHz with the center frequency being the midpoint between the center frequencies of adjacent channels.

• Channel width: nx 250 MHz                    n = 2, 3, 4... 8

• Minimum transmission distance : Optional.

 

Center frequency table of frequency channels

 

- 500 MHz wide channel      

Channel Width (MHz)	Channel	Transmit/Receive Frequency (MHz)	Transmit/Receive Frequency (MHz)
500	1	71375	81375
	2	71875	81875
	3	72375	82375
	4	72875	82875
	5	73375	83375
	6	73875	83875
	7	74375	84375
	8	74875	84875
	9	75375	85375
250	*	75750	85750

 

- 750 MHz channel width    

Channel Width (MHz)	Channel	Transmit/Receive Frequency (MHz)	Transmit/Receive Frequency (MHz)
750	1	71500	81500
	2	72250	82250
	3	73000	83000
250	*	73500	83500
750	4	74000	83750
	5	74750	84500
	6	75500	85250

 

- 1000 MHz wide channel

Channel Width (MHz)	Channel	Transmit/Receive Frequency (MHz)	Transmit/Receive Frequency (MHz)
1000	1	71625	81625
	2	72625	82625
500	*	73375	83375
1000	3	74125	84125
	4	75125	85125
250	*	75750	85750

 

- 1250 MHz wide channel

Channel Width (MHz)	Channel	Transmit/Receive Frequency (MHz)	Transmit/Receive Frequency (MHz)
1250	1	71750	81750
	2	73000	83000
	3	74250	84250
1000	*	75375	85375

 

- 1500 MHz wide channel

Channel Width (MHz)	Channel	Transmit/Receive Frequency (MHz)	Transmit/Receive Frequency (MHz)
1500	1	71875	81875
1000	*	73125	83125
1500	2	74375	84375
750	*	75500	85250

 

- 1750 MHz wide channel

Channel Width (MHz)	Channel	Transmit/Receive Frequency (MHz)	Transmit/Receive Frequency (MHz)
1750	1	72000	82000
750	*	73250	83250
1750	2	74500	84500
500	*	75625	85625

 

- 2000 MHz wide channel

Channel Width (MHz)	Channel	Transmit/Receive Frequency (MHz)	Transmit/Receive Frequency (MHz)
2000	1	72125	82125
500	*	73375	83375
2000	2	74625	84625
250	*	75750	85750

 

(*). Channelization for unused frequency band when channelization is extended

 

Source:

https://mic.gov.vn/van-ban-phap-luat/du-thao/2212.htm

 

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