1、 Recommendation ITU-R F.636-4(03/2012)Radio-frequency channel arrangementsfor fixed wireless systems operatingin the 14.4-15.35 GHz bandF SeriesFixed serviceii Rec. ITU-R F.636-4 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical use of
2、the radio-frequency spectrum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy functions of the Radiocommunication Sector are performed by World and Reg
3、ional Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in Annex 1 of Resolution ITU-R 1. Forms to be used for the sub
4、mission of patent statements and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R patent information database can also be found. Series of ITU-R
5、Recommendations (Also available online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting service (television) F Fixed service M Mobile, radiodetermination, ama
6、teur and related satellite services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite and fixed service systems SM Spectrum management SNG Satellite news g
7、athering TF Time signals and frequency standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2012 ITU 2012 All rights reserved. No part of this publication may b
8、e reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R F.636-4 1 RECOMMENDATION ITU-R F.636-4 Radio-frequency channel arrangements for fixed wireless systems operating in the 14.4-15.35 GHz band (Question ITU-R 247/5) (1986-1990-1992-1994-2012) Scope This Recommendation
9、 provides radio frequency (RF) channel arrangements for fixed wireless systems operating in the 15 GHz (14.4-15.35 GHz) band. The main text of this Recommendation presents RF channel arrangements with separations of 3.5, 7, 14, 28 and 56 MHz. Annexes 1 and 2 present arrangements with a separation of
10、 2.5, 5, 10, 20, 30, 40 and 50 MHz based on a homogeneous 2.5 MHz pattern. The ITU Radiocommunication Assembly, considering a) that the band 14.4-15.35 GHz is allocated to the fixed service and that in some countries only the band 14.5-15.35 GHz is used for fixed wireless systems; b) that, at these
11、frequencies, fixed wireless systems for digital transmissions are feasible with repeater spacings and other features chosen according to rainfall conditions; c) that in various countries there are restrictions on the use of various portions of the whole band 14.4-15.35 GHz, recommends 1 that the pre
12、ferred radio-frequency channel arrangement for digital fixed wireless systems operating with a 28 MHz channel spacing should be derived as follows: Let N28be the number of RF channels; then the frequencies (MHz) of individual channels are expressed by the following relationships: lower half of the b
13、and: fn= fr + a + 28 n MHz upper half of the band: f n= fr + 3 626 28 (N28 n) MHz where: fr : reference frequency, a = 2 688 MHz for the band 14.4-15.35 GHz, and = 2 786 MHz for the band 14.5-15.35 GHz, n = 1, 2, . . . N28, with N28 16 for the band 14.4-15.35 GHz, and N28 15 for the band 14.5-15.35
14、GHz. The channel arrangement with fr= 11 701 MHz and a frequency spacing of 28 MHz is illustrated in Fig. 1; 2 that the preferred radio-frequency channel arrangement for digital fixed wireless systems operating with a 14 MHz channel spacing should be derived as follows: Let N14be the number of RF ch
15、annels; lower half of the band: fn= fr+ a + 14 n MHz upper half of the band: f n= fr+ 3 640 14 (N14 n) MHz 2 Rec. ITU-R F.636-4 where: fr: reference frequency a = 2 702 MHz for the band 14.4-15.35 GHz, and a = 2 800 MHz for the band 14.5-15.35 GHz n = 1, 2, . . . N14with N14 32 for the band 14.4-15.
16、35 GHz n and N14 30 for the band 14.5-15.35 GHz. The channel arrangement with fr= 11 701 MHz and a frequency spacing of 14 MHz is illustrated in Fig. 2; 3 that the preferred radio-frequency channel arrangement for medium-capacity digital fixed wireless systems operating with a 56 MHz channel spacing
17、 should be derived as follows: Let N56be the number of RF channels; then the frequencies (MHz) of individual channels are expressed by the following relationships: lower half of the band: fn= fr+ a + 56 n MHz upper half of the band: two options are possible for maintaining a common duplex separation
18、s with lower size channels arrangements: Option 1: f n= fr+ 3 612 56 (N56 n) MHz Option 2: f n= fr+ 3 584 56 (N56 n) MHz Option 1 should be used when corresponding 28 MHz arrangement provides N28= 2 N56channels, or when no lower channel arrangements are used. Option 2 should to be used when correspo
19、nding 28 MHz arrangement provides N28= 2 N56+ 1 channels, where: fr : reference frequency a = 2 674 MHz for the band 14.4-15.35 GHz, and = 2 772 MHz for the band 14.5-15.35 GHz n = 1, 2, . . . N56, with N56 8 for the band 14.4-15.35 GHz and N56 7 for the band 14.5-15.35 GHz. The channel arrangement
20、with fr= 11 701 MHz and a frequency spacing of 56 MHz is illustrated in Fig. 3; Rec. ITU-R F.636-4 3 FIGURE 1 Radio-frequency channel arrangement for radio-relay systems operating in the 15 GHz band: 28 MHz spacing F.636-01123 1 2 3BA23 MHzN N28 MHzC 56 NFor the band 14.4-15.35 GHz: A = 950 MHz, B =
21、 17 MHz, C = 966 MHz For the band 14.5-15.35 GHz: A = 850 MHz, B = 15 MHz, C = 868 MHz FIGURE 2 Radio-frequency channel arrangement for radio-relay systems operating in the 15 GHz band: 14 MHz spacing F.0636-021234 1 2 3 4BAN9 MHzN14 MHz C 28 NFor the band 14.4-15.35 GHz: A = 950 MHz, B = 17 MHz, C
22、= 952 MHz For the band 14.5-15.35 GHz: A = 850 MHz, B = 15 MHz, C = 854 MHz FIGURE 1/F.636-3. D01 = 6.5 CM 4 Rec. ITU-R F.636-4 FIGURE 3 Radio-frequency channel arrangement for fixed wireless systems operating in the 15 GHz band: 56 MHz spacing F.0636-031BA37 MHz56 MHz C112 NFor the band 14.4-15.35
23、GHz: A = 950 MHz, B = 31 MHz, C = 994 MHzFor the band 14.5-15.35 GHz: A = 850 MHz, B = 29 MHz, C = 896 MHzB65 MB) Option 2 for corresponding N = 2 N + 128 5656 MHz C112 N23 1 2 3N N123 1 2 3AN NA) Option 1 for corresponding N = 2 N28 56For the band 14.4-15.35 GHz: A = 950 MHz, B = 31 MHz, C = 966 MH
24、zFor the band 14.5-15.35 GHz: A = 850 MHz, B = 29 MHz, C = 868 MHzFIGURE 2/F.636-3. D02 = 6.5 CM 4 that, in cases where low-capacity radio channels with 7 or 3.5 MHz channel spacing are required, either the channel arrangement given in 2, in conjunction with similar arrangements shifted respectively
25、 by 7 MHz or 3.5, 7 and 10.5 MHz with respect to it, or one of the following channel arrangements, occupying some of the radio channels of the 28 MHz channel arrangements, should be used: Frequency spacing of 7 MHz: lower half of the band: fm= fr+ a + 28 n + 7 m MHz upper half of the band: f n= fr+
26、3 608.5 28 (N28 n) + 7 m MHz where: fr: reference frequency m = 1, 2, 3 or 4 n: channel number from the basic plan which is being subdivided Rec. ITU-R F.636-4 5 a = 2 670.5 MHz for the band 14.4-15.35 GHz, and a = 2 768.5 MHz for the band 14.5-15.35 GHz. Frequency spacing of 3.5 MHz: lower half of
27、the band: fm= fr+ a + 28 n + 3.5 m MHz upper half of the band: f n= fr+ 3 610.25 28 (N28 n) + 3.5 m MHz where: fr: reference frequency m = 1, 2, 3, 4, 5, 6, 7 or 8 n: channel number from the basic plan which is being subdivided a = 2 672.25 MHz for the band 14.4-15.35 GHz, and a = 2 770.25 MHz for t
28、he band 14.5-15.35 GHz; 5 that due regard be taken of the fact that in some countries, mostly in a large part of Region 2 and in certain other areas, other radio-frequency channel arrangements are used with a preferred 2.5 MHz channel spacing, or multiples thereof, derived from an homogeneous freque
29、ncy pattern defined by the relationship: fp= fr+ 2 697.75 + 2.5 p where: 1 p 380 Based on this pattern, two examples of specific frequency plans are described in Annex 1 and Annex 2; 6 that, in a section through which an international connection is arranged, all the go channels should be in one half
30、 of the band and all the return channels should be in the other half of the band; 7 that both horizontal and vertical polarization shall be used, where possible, for each radio-frequency channel; 8 that for digital systems with a capacity of 70 to 140 Mbit/s the same radio-frequency channel arrangem
31、ent given in 2 may be used utilizing channel numbers n = 2 and 6 in case of co-channel arrangement and n = 1, 3, 5, 7 in case of an alternated arrangement (see Note 3); 9 that, when common transmit-receive antennas are used and no more than half the available channels are accommodated on a single an
32、tenna, it is preferred that the channel frequencies be either odd or even numbered; 10 that, for international connections, the reference frequency should preferably be 11 701 MHz. Other values may be used by agreement between the administrations concerned. NOTE 1 In order to reduce the possibility
33、of an unacceptable degradation in performance occurring, care should be exercised in using mixed channel arrangement in a fixed wireless network. This would especially apply if small-capacity fixed wireless links using the channel arrangements described in 3 and medium-capacity fixed wireless links
34、operating in accordance with the main channel arrangements described in 1 and 2 are both present in close geographical proximity. NOTE 2 In using the band 14.47-14.5 GHz, it is necessary to take all practicable steps to protect spectral line observations of the radio astronomy service from harmful i
35、nterference (see No. 5.149 of the Radio Regulations). NOTE 3 In the case of utilization with digital systems with a symbol rate of more than about 25 MBd care should be taken when using the RF channel 1 at the lower band edge with a guard band of 15 or 17 MHz. 6 Rec. ITU-R F.636-4 Annex 1 Descriptio
36、n of a radio-frequency channel arrangement based on 2.5 MHz homogeneous pattern referred to in recommends 5 This radio-frequency channel arrangement uses the 14 500.0-14 714.5 MHz and 15 136.5-15 350.0 MHz portions of the available band with 2.5 MHz channel spacing as follows: Let N be the number of
37、 RF channels pairs; then the frequencies (MHz) of the individual channels are expressed by the following relationships: lower half of the band: fn= fr+ 2 797.75 + 2.5 n MHz upper half of the band: f n= fr+ 3 647.75 2.5 (N n) MHz where: fr: reference frequency n = 1, 2, . . ., N with N 84. The freque
38、ncy arrangement with fr= 11 701 MHz is illustrated in Fig. 4. FIGURE 4 Radio-frequency channel arrangement for radio-relay systems operating in the 15 GHz band with 2.5 MHz spacing and N = 84 (All frequencies in MHz) F.0636-041.25 2.5 2.5 1.25432.514 500 15 350f1 2ff2f3f846401f3f84fRec. ITU-R F.636-
39、4 7 Annex 2 Description of channel arrangements used in Canada with channel spacing of 5, 10, 20, 30, 40 and 50 MHz based on the 2.5 MHz homogeneous pattern referred to in recommends 5 a) The centre frequencies of the 43 paired channels which allow RF channel bandwidths of 5 MHz and less are express
40、ed by the following relationships: Lower half of the band An= 14 877.5 5 n for n = 1 to 11 An= 14 717.5 5 n for n = 12 to 43 Upper half of the band An= 15 352.5 5 n for n = 1 to 11 An= 15 192.5 5 n for n = 12 to 43 where n is the channel number and Anand Anare the centre frequencies in MHz of the pa
41、ired channels. b) The centre frequencies of the 21 paired channels which allow RF channel bandwidths of greater than 5 MHz and less than or equal to 10 MHz are expressed by the following relationships: Lower half of the band Bn= 14 875 10 n for n = 1 to 5 Bn= 14 715 10 n for n = 6 to 21 Upper half o
42、f the band Bn= 15 350 10 n for n = 1 to 5 Bn= 15 190 10 n for n = 6 to 21 where n is the channel number and Bnand Bnare the centre frequencies in MHz of the paired channels. c) The centre frequencies of the 10 paired channels which allow RF channel bandwidths of greater than 10 MHz and less than or
43、equal to 20 MHz are expressed by the following relationships: Lower half of the band Cn= 14 490 + 20 n for n = 1 to 8 Cn= 14 650 + 20 n for n = 9 to 10 Upper half of the band Cn= 14 965 + 20 n for n = 1 to 8 Cn= 15 125 + 20 n for n = 9 to 10 where n is the channel number and Cnand Cnare the centre f
44、requencies in MHz of the paired channels. d) The centre frequencies of the six paired channels which allow RF channels bandwidths of greater than 20 MHz and less than or equal to 30 MHz are expressed by the following relationships: Lower half of the band Dn= 14 485 + 30 n for n = 1 to 5 Dn= 14 655 +
45、 30 n for n = 6 Upper half of the band Dn= 14 960 + 30 n for n = 1 to 5 Dn= 15 130 + 30 n for n = 6 where n is the channel number and Dnand Dnare the centre frequencies in MHz of the paired channels. 8 Rec. ITU-R F.636-4 e) The centre frequencies of the five paired channels which allow RF channels b
46、andwidths of greater than 30 MHz and less than or equal to 40 MHz are expressed by the following relationships: Lower half of the band En= 14 480 + 40 n for n = 1 to 4 En= 14 640 + 40 n for n = 5 Upper half of the band En= 14 955 + 40 n for n = 1 to 4 En= 15 115 + 40 n for n = 5 where n is the chann
47、el number and Enand Enare the centre frequencies in MHz of the paired channels. f) The centre frequencies of the four paired channels which allow RF channels bandwidths of greater than 40 MHz and less than or equal to 50 MHz are expressed by the following relationships: Lower half of the band Fn= 14 475 + 50 n for n = 1 to 3 Fn= 14 645 + 50 n for n = 4 Upper half of the band Fn= 14 950 + 50 n for n = 1 to 3 Fn= 15 120 + 50 n for n = 4 where n is the channel number and Fnand Fnare the centre frequencies in MHz of the paired channels. _
