Recommendation itu-r f. 1520-1 Radio-frequency arrangements for systems in the fixed service operating in the band 31. 8-33. 4 Ghz




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Rec. ITU-R F.1520-1

RECOMMENDATION ITU-R F.1520-1

Radio-frequency arrangements for systems in the fixed service operating in the band 31.8-33.4 GHz

(Questions ITU-R 108/9 and ITU-R 229/9)

(2001-2002)

The ITU Radiocommunication Assembly,

considering

a) that the band 31.8-33.4 GHz is allocated, among others, to the fixed service (FS) on a primary basis;

b) that in the Radio Regulations (RR) No. 5.547 identifies the 31.8-33.4 GHz band as being available for high-density applications in the FS;

c) that sharing in the 31.8-33.4 GHz band with radionavigation service, space research service (deep space, space-to-Earth) and inter-satellite service is considered to be feasible;

d) that RR No. 5.547A states that administrations should take practical measures to minimize the potential interference between stations in the FS and airborne stations in the radionavigation service in the 31.8-33.4 GHz band, taking into account the operational needs of the airborne radar systems;

e) that harmonized radio-frequency (RF) arrangements can facilitate effective use of the spectrum;

f) that several systems with various transmission signal characteristics and capacities may be in simultaneous use in this frequency band;

g) that certain frequency block arrangements can be achieved by aggregating the frequency channels given in Annex 1;

h) that it may sometimes be desirable to interleave additional RF channels between those of the main pattern;

j) that a high degree of compatibility between fixed service systems of different frequency arrangements can be achieved by selecting channel centre frequencies within a homogeneous basic pattern;

k) that each region or country will have specific needs in how to use the band;

l) that different block sizes may be required to suit various applications,



recognizing

that some applications in this frequency band may require differing architectures (point-to-point and multipoint systems), channel bandwidths, and systems characteristics including the accommodation of symmetrical and asymmetrical traffic; and may require the use of frequency block-based arrangements that may or may not align with the channel arrangement in Annex 1,



recommends

1 that administrations should consider the RF channel arrangement given in Annex 1 for FS systems deployment in the 31.8-33.4 GHz frequency band;

2 that when additional RF channels interleaved between those of the main pattern, as described in Annex 1, are required, the values of the centre frequencies of these RF channels should be below those of the corresponding main channel frequencies by a value of half the considered channel spacing;

3 that those administrations wishing to implement FS systems in this band using a block based frequency arrangement should consider the guidance given in Recommendation ITU R F.1519;

4 that administrations wishing to implement block based arrangements, based on block-size increments of 56 MHz, should consider the arrangement in Annex 2.
ANNEX 1

Radio-frequency channel arrangement in the band 31.8-33.4 GHz

The RF channels for separations of 3.5 MHz, 7 MHz, 14 MHz, 28 MHz and 56 MHz shall be derived as follows:

let fr be the reference frequency of 32 599 MHz,

fn be the centre frequency (MHz) of the RF channel in the lower half of the band,

be the centre frequency (MHz) of the RF channel in the upper half of the band,

frequency duplex spacing  812 MHz,

then the frequencies (MHz) of individual channels are expressed by the following relationships:

a) for channel separation of 56 MHz:

lower half of the band:   fr – 756  56 n

upper half of the band:   fr  56  56 n

where:


n = 1, 2, 3, … 12

b) for a channel separation of 28 MHz:

lower half of the band:   fr – 798  28 n

upper half of the band:   fr  14  28 n

where:

n = 1, 2, 3, … 27

c) for a channel separation of 14 MHz:

lower half of the band:   fr – 791  14 n

upper half of the band:   fr  21  14 n

where:

n = 1, 2, 3, … 54

d) for a channel separation of 7 MHz:

lower half of the band:   fr – 787.5  7 n

upper half of the band:   fr  24.5  7 n

where:

n = 1, 2, 3, … 108

e) for a channel separation of 3.5 MHz:

lower half of the band:   fr – 785.75  3.5 n

upper half of the band:   fr  26.25  3.5 n

where:

n = 1, 2, 3, … 216.

NOTE 1 – Systems using time division duplex (TDD) techniques can operate in both sub bands and the centre gap.



Centre gap  56 MHz for the 3.5, 7, 14 and 28 MHz channel separation, 140 MHz for the 56 MHz channel separation.
TABLE 1

Calculated parameters according to Recommendation ITU-R F.746


XS
(MHz)


n

f1
(MHz)


fn
(MHz)



(MHz)



(MHz)


ZS1
(MHz)


ZS2
(MHz)


YS
(MHz)


DS
(MHz)


56

1, ..., 12

31 899

32 515

32 711

33 327

99

73

196

812

28

1, ..., 27

31 829

32 557

32 641

33 369

29

31

84

812

14

1, ..., 54

31 822

32 564

32 634

33 376

22

24

70

812

7

1, ..., 108

31 818.5

32 567.5

32 630.5

33 379.5

18.5

20.5

63

812

3.5

1, ..., 216

31 816.75

32 569.25

32 628.75

33 381.25

16.75

18.75

59.5

812

XS: separation between centre frequencies of adjacent channels.

YS: separation between centre frequencies of the closest go and return channels.

ZS1: separation between the lower band edge and the centre frequency of the lowest channel in the lower sub-band.

ZS2: separation between centre frequency of the highest channel in the upper sub-band and the upper band edge.

DS: duplex spacing




ANNEX 2

Radio-frequency block arrangement in the band 31.8-33.4 GHz
using block size increments of 56 MHz

This Annex provides an example RF block arrangement for the band 31.8-33.4 GHz using block size increments of 56 MHz. Guidance is provided on a flexible approach to specifying portions of the band for RF channel assigned point-to-point systems and RF block allocated systems.

For frequency division duplex (FDD) the band is divided into twelve (56  56) MHz symmetrically paired frequency blocks as follows:

TABLE 2



Paired block

Lower frequency sub band block
(MHz)


Upper frequency sub band block
(MHz)


A/A'

B/B'


C/C'

D/D'


E/E'

F/F'


G/G'

H/H'


I/I'

K/K'


L/L'

M/M'


31 871-31 927

31 927-31 983

31 983-32 039

32 039-32 095

32 095-32 151

32 151-32 207

32 207-32 263

32 263-32 319

32 319-32 375

32 375-32 431

32 431-32 487

32 487-32 543



32 683-32 739

32 739-32 795

32 795-32 851

32 851-32 907

32 907-32 963

32 963-33 019

33 019-33 075

33 075-33 131

33 131-33 187

33 187-33 243

33 243-33 299

33 299-33 355



Different RF block arrangements can be achieved by aggregating the frequency blocks specified in Table 2.

As an example, the band may contain several aggregated blocks, arranged in a way shown in Table 3.

TABLE 3



Paired block

Lower frequency block
(MHz)


Upper frequency block
(MHz)


1 (2  112 MHz block)

2 (2  112 MHz block)

3 (2  112 MHz block)

4 (2  56 MHz block)

5 (2  56 MHz block)

6 (2  56 MHz block)

7 (2  168 MHz block)


31 871-31 983

31 983-32 095

32 095-32 207

32 207-32 263

32 263-32 319

32 319-32 375

32 375-32 543


32 683-32 795

32 795-32 907

32 907-33 019

33 019-33 075

33 075-33 131

33 131-33 187

33 187-33 355


The 56 MHz block arrangement and possible aggregation are shown below in Figs. 2 and 3, respectively.





For FDD systems, the blocks located in the lower part of each sub-band should be used preferably with the upper sub-band for uplink transmissions, and lower sub-band for downlink transmissions. Systems using TDD can operate in both sub-bands and the centre guardband.



Arrangements stated in Figs. 2 and 3 do not preclude the use of other blocks or block pairs.


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