1、 Recommendation ITU-R F.595-10(03/2012)Radio-frequency channel arrangements forfixed wireless systems operating in the17.7-19.7 GHz frequency bandF SeriesFixed serviceii Rec. ITU-R F.595-10 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economi
2、cal use of 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 Wo
3、rld and Regional 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
4、for the submission 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. Serie
5、s of ITU-R 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, radiodetermi
6、nation, amateur 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 Satel
7、lite news gathering 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 public
8、ation may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R F.595-10 1 RECOMMENDATION ITU-R F.595-10 Radio-frequency channel arrangements for fixed wireless systems operating in the 17.7-19.7 GHz frequency band (Question ITU-R 247-5) (1982-1986-1990-1992-1995-1997
9、-1999-2002-2003-2006-2012) Scope This Recommendation provides radio-frequency channel arrangements for fixed wireless systems operating in the 18 GHz band (17.7-19.7 GHz), which may be used for high, medium and low capacity fixed service applications including mobile infrastructure. The channel spac
10、ings recommended in the main text are 220, 110, 55 and 27.5 MHz for co-channel arrangements as well as interleaved arrangements for 220 and 110 MHz spacings. Other arrangements used in some countries are also provided. The ITU Radiocommunication Assembly, considering a) that there may be economic an
11、d operational advantages in the use of fixed wireless systems (FWS) for the transmission of digital signals in the frequency band 17.7 to 19.7 GHz; b) that it may be desirable to interconnect such systems at radio frequencies on international circuits; c) that a sufficient degree of compatibility be
12、tween systems of different capacities should be assured; d) that frequency block arrangements allow flexible deployment of fixed wireless systems, recommends 1 that the preferred radio-frequency (RF) channel arrangement for digital FWS systems with a capacity of the order of 280 Mbit/s, the order of
13、 140 Mbit/s and 34 Mbit/s or synchronous digital hierarchy bit rates operating in the 17.7 to 19.7 GHz band should be derived as follows: Let f0be the frequency of the centre of the band of frequencies occupied (MHz), fnbe the centre frequency of a RF channel in the lower half of the band (MHz), nf
14、be the centre frequency of a RF channel in the upper half of the band (MHz), then the frequencies (MHz) of individual channels are expressed by the following relationships: 1.1 Co-channel arrangement 1.1.1 for systems with a capacity of the order of 280 Mbit/s: lower half of the band: fn= f0 1 110 +
15、 220 n MHz upper half of the band: nf = f0+ 10 + 220 n MHz where: n = 1, 2, 3 or 4. The frequency arrangement is illustrated in Fig. 1a). 2 Rec. ITU-R F.595-10 1.1.2 for systems with a capacity of the order of 140 Mbit/s: lower half of the band: fn= f0 1 000 + 110 n MHz upper half of the band: nf =
16、f0+ 10 + 110 n MHz where: n = 1, 2, 3, 4, 5, 6, 7 or 8. The frequency arrangement is illustrated in Fig. 1b). 1.1.3 for systems with a capacity of the order of 34 Mbit/s: lower half of the band: fn= f0 1 000 + 27.5 n MHz upper half of the band: nf = f0+ 10 + 27.5 n MHz where: n = 1, 2, 3, . . . 35.
17、The frequency arrangement is illustrated in Fig. 1c). 1.1.4 for systems with a capacity of the order of 140 Mbit/s or STM-1 with multi-state modulation formats: lower half of the band: fn= f0 1 000 + 55 n MHz upper half of the band: nf = f0+ 10 + 55 n MHz where: n = 1, 2, 3, . . . 17. The frequency
18、arrangement is illustrated in Fig. 1d). 1.2 Interleaved arrangement 1.2.1 for systems with a capacity of the order of 280 Mbit/s: lower half of the band: fn= f0 1 000 + 110 n MHz upper half of the band: nf = f0+ 120 + 110 n MHz where: n = 1, 2, 3, 4, 5, 6 or 7. The frequency arrangement is illustrat
19、ed in Fig. 2a). 1.2.2 for systems with a capacity of the order of 140 Mbit/s: lower half of the band: fn= f0 945 + 55 n MHz upper half of the band: nf = f0+ 65 + 55 n MHz where: n = 1, 2, 3, . . . 15. The frequency arrangement is illustrated in Fig. 2b); Rec. ITU-R F.595-10 3 FIGURE 1 Radio-frequenc
20、y channel arrangement for fixed wireless systems operating in the 17.7 to 19.7 GHz band (Co-channel arrangement) (All frequencies in MHz) F.0595-0175H Vc)13055H Vd)1357911131517246810121416135791113151724681012141617700197005524022011046011010001000H Va)12342341110H Vb)123467581r2r3r4r5r6r7r8r1r2r3r
21、4r5r6r1r3r5r7r9r11r13r15r17r2r4r6r8r10r12r14r16r3 r1 r2 r5r 7 r9r 11r13r 15r 17r4 r6 r8 r10r12r 14r16r f01r 2 r3r 4 r5r 6 r7r 8r 123456781r2r3r4r1r 2r 3r 4r 6123451354621 r3 r5r 2r 4r 6 r31333530323434r32r30r35r33r31r31333530323430r32r34r 31r 33r 35rChannelnumberReturn (go)Go(return)P o la r i z a t
22、io n27.527.54 Rec. ITU-R F.595-10 FIGURE 2 Radio-frequency channel arrangement for fixed wireless systems operating in the 17.7 to 19.7 GHz band (Interleaved arrangement) (All frequencies in MHz) F.0595-02f0H(V)V(H)22013574261 3 5 72 4 6110 4601 000 1 000110110 24013579113152 4 6 8 10 12 141 3 5 7 9
23、 11 13 152 4 6 8 10 12 14H(V)V(H)a)b)PolarizationChannel numberReturn (go)Go (return)2 that the preferred RF channel arrangement for digital FWS with a capacity of 155 Mbit/s for use in the synchronous digital hierarchy should be as given in 1.1.2 (co-channel arrangement) and 1.2.2 (alternated chann
24、el arrangement) for systems using QPSK-like modulation. While for systems using 16-QAM-like modulation the RF channel arrangement shown in Fig. 1d) is preferred for co-channel operation. The frequencies of channels 2, 3, 4, . . . 16 in Fig. 1d) are the same as the centre frequencies in 1.2.2 for cha
25、nnels 1, 2, 3, . . . 15 respectively. Channels 1 and 17 in Fig. 1d) are allocated 55 MHz below channel 2 and above channel 16 respectively; 3 that, in the section through which an international connection is arranged to pass, all the go channels should be in one half of the band and all the return c
26、hannels should be in the other half of the band; 4 that both horizontal and vertical polarizations should be used for each RF channel in the co-channel arrangement; 5 that the centre frequency f0is 18 700 MHz; 6 that for low capacity digital systems, i.e. below about 10 Mbit/s, frequency allocations
27、 may be accommodated within any of the high-capacity channels or guardbands as shown by Annexes 3 and 5. Channels 1, 1 and 8, 8 of Fig. 1b) or channels 1, 1 and 17, 71 of Fig. 1d) and the guardbands are the most suitable choice for sub-band allocations for such low capacity utilizations, however, wh
28、en more band is required, the adjacent channels may be used as shown by the example in Annex 5 where also channels 2, 2 of Fig. 1d) are assigned to low capacity use. The selection of Rec. ITU-R F.595-10 5 alternative allocations should not prevent the pairing of the go and return channels in the man
29、ner described in Figs 1 and 2; 7 that for medium-capacity systems with bit rates different from that given in 1.1.3 above and for low capacity systems, administrations may adopt other RF channel arrangements in conformity with the recommended pattern for high-capacity systems (see Annex 4); 8 that d
30、ue regard should be taken of the fact that in some countries another arrangement of the go and return channels which incorporates a mid-band allocation for low capacity systems may be used, as shown in Fig. 3; FIGURE 3 Co-channel radio-frequency arrangement for fixed wireless systems operating in th
31、e 18 GHz band referred to in recommends 7 (All frequencies in MHz) F.0595-031357H(V)1357120120WWWW/NN WWWW/NN1 0001 000220WWWW/NN WWWW/NN2468 246817 810 18 470 18 930 19 590V(H) V(H)f0H(V)Channel numberW: wideband channel (high-capacity of the order of 280 Mbit/s) N: narrow-band channel (small-capac
32、ity, below 10 Mbit/s) W/N: wideband or narrow-band channel 9 that due regard should be taken of the fact that based on the above considering d) frequency block arrangements may be used (see Annex 1); 10 that due regard should be taken of the fact that in some countries the band 17.7 to 19.7 GHz is s
33、ubdivided to serve different applications in separate parts of the band (see Annex 2) or is used for low capacity systems (see Annex 3) with different go-return (Tx/Rx duplex) and channel spacings; 11 that due regard should be taken of the fact that in one country, another channel arrangement is use
34、d (see Annexes 6 and 7); 6 Rec. ITU-R F.595-10 12 that if multi-carrier transmission (Note 3) is employed the overall number of n carriers will occupy a single channel the centre frequency and channel spacing of which will be that defined according to Figs 1 and 2, disregarding the actual centre fre
35、quencies of the individual carriers, which may vary, for technical reasons according to practical implementations. NOTE 1 In establishing these systems, account should be taken of the primary allocation to the Earth exploration-satellite service (passive) in the band 18.6 to 18.8 GHz, the provisions
36、 of No. 5.522A of the Radio Regulations and the need to protect passive sensors in this band. NOTE 2 Actual gross bit rates may be as much as 5% or more higher than net transmission rates. NOTE 3 A multi-carrier system is a system with n (where n 1) digitally modulated carrier signals simultaneously
37、 transmitted (or received) by the same RF equipment. Annex 1 Description of RF block arrangements in the band 17.7 to 19.7 GHz referred to in recommends 9 1 Introduction The following example arrangements can be referred to for use by administrations wishing to implement arrangements based on freque
38、ncy blocks. 2 RF block arrangement description Paired block Lower frequency block (MHz) Upper frequency block (MHz) CH-4/CH-4 17 730-17 790 18 480-18 540 CH-5/CH-5 17 790-17 850 18 540-18 600 CH-9/CH-9 17 970-18 030 19 220-19 280 CH-10/CH-10 18 030-18 090 19 280-19 340 CH-11/CH-11 18 090-18 150 19 3
39、40-19 400 CH-12/CH-12 18 150-18 210 19 400-19 460 CH-13/CH-13 18 210-18 270 19 460-19 520 CH-14/CH-14 18 270-18 330 19 520-19 580 CH-15/CH-15 18 330-18 390 19 580-19 640 CH-16/CH-16 18 390-18 450 19 640-19 700 NOTE 1 In the band 17.70-17.73 GHz paired with 18.45-18.48 GHz, 3 pairs of RF channels (CH
40、-1,2, and 3/CH-1, 2 and 3) are accommodated for small capacity systems for the purpose of disaster protection. NOTE 2 In the band 17.85-17.97 GHz paired with 18.60-18.72 GHz, 3 pairs of RF channels (CH-6, 7, and 8/CH-6, 7 and 8) are accommodated for high capacity systems for the purpose of mobile in
41、frastructure. Rec. ITU-R F.595-10 7 Annex 2 Description of an RF channel arrangement in the band 17.7 to 19.7 GHz referred to in recommends 10 In North America this band is structured to accommodate the implementation of low, medium and high capacity point-to-point, digital fixed wireless systems. S
42、uch structuring allows for more efficient and effective use of the spectrum for applications including fixed wireless access and mobile infrastructure support networks. The resulting composite RF channel arrangement is illustrated in Fig. 4. FIGURE 4 Radio-frequency channel arrangements for digital
43、fixed wireless systems in the 17.7 to 19.7 GHz band (North America) (All frequencies in MHz) F.0595-04177001774017800177921800018140182001824018300193001936019400195001960019700VW B , N B ( T )1 1WB ,2NB (R)21 W1 W W B , NB (R)11WB ,2NB (T)2WB: 50, 40, 30, 20 MHz “wideband“ channels NB: 10, 5, 2.5 M
44、Hz “narrowband“ channels 1W: 50, 40, 30, 20, 10, 5, 2.5 MHz unpaired channels V: video radio relay and distribution (T): transmit frequencies: go (return) (R): receive frequencies: return (go) 1: T/R spacing = 1 560 MHz 2: T/R spacing = 1 160 MHz NOTE 1 In Canada, the bands 17.7-17.8 GHz and 18.3-19
45、.3 GHz are no longer available for new FS stations. NOTE 2 Other channel arrangements to be covered under this Annex are under study in the United States of America. 8 Rec. ITU-R F.595-10 Annex 3 Description of the RF channel arrangements in the band 17.7 to 19.7 GHz referred to in recommends 10 In
46、the United Kingdom, this band is also used (in addition to certain channel plans referred to in recommends 1 and recommends 7) for low capacity equipment, in accordance with the following plans: Channel plan based on a 3.5 MHz channel spacing (Fig. 5a) lower half of the band: fn= f0 981.25 + 3.5 n M
47、Hz upper half of the band: nf = f0+ 26.75 + 3.5 n MHz where: f0= 18 700 MHz n = 1, 2, 3, . . . 272. Channel plan based on a 7 MHz channel spacing (Fig. 5b): lower half of the band: fn= f0 983 + 7 n MHz upper half of the band: nf = f0+ 25 + 7 n MHz where: f0= 18 700 MHz n = 1, 2, 3, . . . 136. FIGURE
48、 5a Radio-frequency channel arrangement for low capacity fixed wireless systems with 3.5 MHz channel spacing operating in the 18 GHz band (United Kingdom) (All frequencies in MHz) F.0595-05a1 000 1 000HV12345 271272 1 2 3 4 5 271 27222.2529.25 30.253.521.25Go (return) Return (go)NOTE 1 Within the UK
49、 channels 212 to 272 are available on the 3.5 MHz plan. Rec. ITU-R F.595-10 9 FIGURE 5b Radio-frequency channel arrangement for low capacity fixed wireless systems with 7 MHz channel spacing operating in the 18 GHz band (United Kingdom) (All frequencies in MHz) F.0595-05b1 000 1 000HV1 2 3 4 5 135 136 1 2 3 4 5 135 1362431 32723Go (return) Return (go)NOTE 1 Within the UK channels 107 to 13
