1、 Recommendation ITU-R F.746-10(03/2012)Radio-frequency arrangements for fixed service systemsF SeriesFixed serviceRec. ITU-R F.746-10 ii Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical use of the radio-frequency spectrum by all radioc
2、ommunication 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 Regional Radiocommunication Conferences and R
3、adiocommunication 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 submission of patent statements and licensing
4、 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 Recommendations (Also available online at
5、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, amateur and related satellite services P Radi
6、owave 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 gathering TF Time signals and frequency sta
7、ndards 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 be reproduced, by any means whatsoever, wit
8、hout written permission of ITU. Rec. ITU-R F.746-10 1 RECOMMENDATION ITU-R F.746-10 Radio-frequency arrangements for fixed service systems (Question ITU-R 247/5) (1991-1994-1995-1997-1999-2001-2002-2003-2006-2007-2012) Scope This Recommendation provides general guidelines for developing radio-freque
9、ncy arrangements for fixed wireless systems. It also presents a summary of all the current radio-frequency arrangements contained in various Recommendations and provides in various Annexes specific radio-frequency channel arrangements not covered in the scope of other specific Recommendations. The I
10、TU Radiocommunication Assembly, considering a) that according to Article 5 of the Radio Regulations several frequency bands are allocated to the fixed service (FS) on a worldwide basis; b) that other frequency bands are also allocated to the FS on a regional basis; c) that systems are already in use
11、 and expected to be used more extensively in the future; d) that it may be desirable to interconnect fixed wireless systems (FWSs) on international circuits in these frequency bands; e) that in studies carried out so far, some bands have not been the subject of Recommendations for specific radio-fre
12、quency channel arrangements which might be fitted into an international pattern as has already been done in other parts of the frequency spectrum; f) that an index of recommended radio-frequency channel arrangements would be of assistance to the ITU-R; g) that single- and multi-carrier digital FWSs
13、are both useful concepts to achieve the best technical and economic trade-off in system design, recommends 1 that homogeneous patterns are preferred as the basis for radio-frequency channel arrangements; 2 that the preferred radio-frequency channel arrangements should be developed from the homogeneo
14、us pattern in accordance with the alternated, co-channel band reuse, or interleaved band reuse radio-frequency channel arrangements (see Note 1) as shown in Figs 1a), 1b) and 1c) respectively. The main parameters affecting the choice of radio-frequency channel arrangements are: XS defined as the rad
15、io-frequency separation between the centre frequencies of adjacent radio-frequency channels on the same polarization and in the same direction of transmission; Recommendation ITU-R F.1191 defines that XS is equal to twice the channel separation for the alternated radio-frequency channel arrangement
16、of Fig. 1a), and is equal to the channel separation for the co-channel and interleaved band reuse radio-frequency channel arrangements of Figs 1b) and 1c). The channel separation is sometimes identified with the term radio-frequency channel spacing and also considered equal to the channel bandwidth.
17、 2 Rec. ITU-R F.746-10 YS defined as the radio-frequency separation between the centre frequencies of the go and return radio-frequency channels which are nearest to each other (also named innermost channels). In the case where go and return frequency sub-bands are not contiguous, such that there is
18、 a (are) band(s) allocated: for (an)other service(s) in the gap between, YS shall be considered to include the band separation (BS) equal to the total width of the allocated band(s) used by this (these) service(s). ZS defined as the radio-frequency separation between the centre frequencies of the ou
19、termost radio-frequency channels and the edge of the frequency band (also defined as guardband by Recommendation ITU-R F.1191). In the case where the lower and upper separations differ in value, Z1S refers to the lower separation and Z2S refers to the upper separation. In the case where go and retur
20、n frequency sub-bands are not contiguous, such that there is a (are) band(s) allocated for (an)other service(s) in the gap between, ZSiwill be defined for the innermost edges of both sub-bands and will be included in YS. DS Tx/Rx duplex spacing, defined as the radio-frequency separation between corr
21、esponding go and return channels, constant for each couple of i-th and i-th frequencies, within a given channel arrangement. Rec. ITU-R F.746-10 3 FIGURE 1 Radio-frequency channel arrangements for the three possible schemes considered in the text F.0746-01ABH(V)V(H)XSXSXS22DS134N1 32 4 NZSYSa)ABb)XS
22、DSN1234 N1 2 3 4H(V)V(H)1r 2r 3r 4r Nr 1r 2r 3r 4r NrZSYSABH(V)XS1YSN2341r 2r 3r 4r NrN1 2 3 41r 2r 3r 4rNrZSV(H)DSXSXS2c)Alternated patternMain frequenciesChannel numberPolarizationsMain frequencypatternBand reuse in theco-channel modeChannel numberPolarizationsMain frequencypatternBand reuse in th
23、einterleaved modeChannel numberPolarizationsA: “go” channels B: “return” channelsThe choice of radio-frequency channel arrangement depends on the values of cross-polar discrimination (XPD) and on the net filter discrimination (NFD) where these parameters are defined as: 2)Note(See)(onpolarizationdtr
24、ansmitte)(onpolarizatioppositeonreceivedPower)(onpolarizationdtransmitte)(onpolarizationreceivedPower)(VHHVVHVHXPDVH=3)Note(SeefiltersBBandIFRF,afterreceivermainthebyreceivedpowerchannelAdjacentpowerreceivedchannelAdjacent=NFDThe XPD and NFD parameters (dB) contribute to the value of carrier-to-inte
25、rference ratio. If XPDminis the minimum value reached for the percentage time required, from this value and from the adjacent channel NFD, the total amount of interfering power can be evaluated, and this result must be compared with the minimum value of carrier-to-interference (C/I )minacceptable to
26、 the modulation adopted (see Note 4). 4 Rec. ITU-R F.746-10 Alternated channel arrangements can be used (neglecting the co-polar adjacent channel interference contribution) if: XPDmin+ (NFD 3) (C/I )mindBCo-channel arrangements can be used if: minNFDXIFXPDICa)/(1011011log1010310+dB Interleaved chann
27、el arrangements can be used if: minNFDNFDXPDICab)/(1011011log1010310)3(+dB where: NFDa : net filter discrimination evaluated at XS frequency spacing; NFDb: net filter discrimination evaluated at XS / 2 frequency spacing; XIF : XPD improvement factor of any cross-polar interference countermeasure, if
28、 implemented in the interfered receiver; 3 that the channel arrangements reported in Fig. 1 may be used for digital FWSs either with single carrier or multi-carrier transmission (see Note 5); 4 that when multi-carrier transmission is employed, the overall number of carriers will be regarded as a sin
29、gle channel whose centre frequency and channel spacing will be that defined according to Fig. 1 disregarding the actual centre frequency of the carriers, which may vary, for technical reasons, according to practical implementations; 5 that where practicable (e.g. in newly exploited or rearranged ban
30、ds with comparable width) it is useful to have the same duplex separation in different nearby frequency bands; 6 that the following categorization with respect to the transmission capacity may be used in ITU-R Recommendations on digital fixed wireless systems (see also Annex 1 to Recommendation ITU-
31、R F.1101): “low-capacity fixed wireless systems” for the transmission of digital signals with gross bit rates up to and including 10 Mbit/s; “medium-capacity fixed wireless systems” for the transmission of digital signals with gross bit rates ranging from 10 Mbit/s up to about 100 Mbit/s; “high-capa
32、city fixed wireless systems” for the transmission of digital signals with gross bit rates greater than 100 Mbit/s; 7 that Tables 1 and 2 report the summary of presently ITU-R defined radio-frequency channel arrangements with reference to the relevant Recommendation. Some radio-frequency channel arra
33、ngements in bands that are not covered by a specific Recommendation, and which are nevertheless used by administrations, are described in Annexes 1 to 8. Rec. ITU-R F.746-10 5 TABLE 1 Radio-frequency channel arrangement for fixed service systems in frequency bands below about 17 GHz Band (GHz) Frequ
34、ency range (GHz) Recommendations ITU-R F Series Channel separation (MHz) 0.4 0.4061-0.430 0.41305-0.450 1567, Annex 1 1567, Annex 1 0.05; 0.1; 0.15; 0.2; 0.25; 0.6; 0.25; 0.3; 0.5; 0.6; 0.75; 1; 1.75; 3.5 1.4 1.35-1.53 1242 0.25; 0.5; 1; 2; 3.5 2 1.427-2.69 1.7-2.1; 1.9-2.3 1.9-2.3 1.9-2.3 1.9-2.3 2
35、.3-2.5 2.29-2.67 701 382 1098 1098, Annexes 1, 2 1098, Annex 3 746, Annex 1 1243 0.5 (pattern) 29 3.5; 2.5 (patterns) 14 10 1; 2; 4; 14; 28 0.25; 0.5; 1; 1.75; 2; 3.5; 7; 14; 2.5 (pattern) 3.6 3.4-3.8 3.4-3.8 1488, Annex 1 1488, Annex 2 25(1)0.25(2)4 3.8-4.2 3.7-4.2 3.6-4.2 3.6-4.2 382 382, Annex 1
36、635 635, Annex 1 29 28 10 (pattern) 90; 80; 60; 40; 30 U4 4.4-5.0 4.4-5.0 4.4-5.0 4.54-4.9 1099 1099, Annex 1 1099, Annex 3 1099, Annex 2 10 (pattern) 40; 60; 80 28 40; 20 L6 5.925-6.425 5.85-6.425 5.925-6.425 5.925-6.425 5.925-6.425 383 383, Annex 1 383, Annex 1 383, Annex 2 383, Annex 3 29.65 90;
37、60; 40 28 40; 20; 10; 5 U6 6.425-7.11 6.425-7.11 6.425-7.11 384 384, Annex 1 384, Annex 2 40; 30; 20; 10; 5 80 30; 14; 7; 3.5 6 Rec. ITU-R F.746-10 TABLE 1 (end) Band (GHz) Frequency range (GHz) Recommendations ITU-R F Series Channel separation (MHz) 7 7.25-7.55 7.425-7.725 (7.125-7.425)(3)(7.250-7.
38、550)(3)(7.550-7.850)(3)7 125-7 425 7.425-7.725 7.435-7.75 7.11-7.75 7.425-7.90 385, Annex 5 385 385, Annex 1 385, Annex 1 385, Annex 2 385, Annex 3 385, Annex 4 3.5 7; 14; 28 1.75; 3.5; 7; 14; 28 1.75; 3.5; 7; 14; 28 5; 10; 20 28 28 8 7.725-8.275 8.275-8.5 7.9-8.4 7.725-8.275 8.025-8.5 7.725-8.275 8
39、.2-8.5 386, Annex 1 386, Annex 2 386, Annex 3 386, Annex 4 386, Annex 5 386, Annex 6 386, Annex 7 30; 20; 10; 5; 2.5; 1.25 14; 7 28; 14; 7 40; 20; 10; 5 28; 14; 7 29.65 11.662 10 10.0-10.68 10.0-10.68 10.15-10.65 10.15-10.65 10.15-10.65 10.5-10.68 10.55-10.68 747 747, Annex 4 747, Annex 3 1568, Anne
40、x 1 1568, Annex 2 747, Annex 1 747, Annex 2 1.25 and 3.5 patterns 3.5; 7; 14; 28 (patterns) 3.5; 7; 14; 28 (patterns) 28(1)30(1)7; 3.5 (patterns) 5; 2.5; 1.25 (patterns) 11 10.7-11.7 10.7-11.7 10.7-11.7 10.7-11.7 10.7-11.7 387 387, Annex 2 387, Annex 1 387, Annex 3 387, Annex 4 40 60 80 5; 10; 20 7;
41、 14; 28 12 11.7-12.5 12.2-12.7 746, Annex 2, 3 746, Annex 2, 2 19.18 20 (pattern) 13 12.75-13.25 12.7-13.25 497 746, Annex 2, 1 28; 14; 7; 3.5 25; 12.5 14 14.25-14.5 14.25-14.5 746, Annex 3 746, Annex 4 28; 14; 7; 3.5 7; 14; 28 15 14.4-15.35 14.5-15.35 14.5-15.35 636 636, Annex 1 636, Annex 2 636, A
42、nnex 3 56; 28; 14; 7; 3.5 2.5 (pattern) 2.5 5; 10; 20; 30; 40; 50 (1)Frequency block bandwidth. (2) Basic frequency slot for aggregating wider frequency block bandwidth. (3)Alternative bands in parentheses. Rec. ITU-R F.746-10 7 TABLE 2 Radio-frequency channel arrangements for fixed service systems
43、in frequency bands above about 17 GHz Band (GHz) Frequency range (GHz) Recommendations ITU-RF Series Channel separation (MHz) 18 17.7-19.7 17.7-19.7 17.7-19.7 17.7-19.7 17.7-19.7 17.7-19.7 17.7-19.7 17.7-19.7 18.58-19.16 595 595, Annex 1 595, Annex 2 595, Annex 3 595, Annex 4 595, Annex 5 595, Annex
44、 6 595, Annex 7 595, Annex 7 220; 110; 55; 27.5 60 (block) 50; 40; 30; 20; 10; 5; 2.5 7; 3.5 27.5; 13.75; 7.5; 7; 3.5; 1.75 55; 110 55; 27.5; 13.75 60 23 21.2-23.6 21.2-23.6 22.0-23.6 21.2-23.6 21.2-23.6 637 637, Annex 1 637, Annex 2 637, Annex 3 637, Annex 4 3.5; 2.5 (patterns) 112 to 3.5 112 to 3.
45、5 2.5; 5; 7.5; 10; 15; 20; 40; 50 112 to 3.5 27 24.25-25.25 24.25-25.25 25.25-27.5 25.27-26.98 24.5-26.5 27.5-29.5 27.5-29.5 748 748, Annex 3 748 748, Annex 3 748, Annex 1 748 748, Annex 2 3.5; 2.5 (patterns) 40(1)3.5; 2.5 (patterns) 60(1)112 to 3.5 3.5; 2.5 (patterns) 112 to 3.5 31 31.0-31.3 31.0-3
46、1.3 746, Annex 5 746, Annex 6 25; 50 28; 14; 7; 3.5 32 31.8-33.4 31.8-33.4 1520, Annex 1 1520, Annex 2 3.5; 7; 14; 28; 56; 112 56(1) 38 36.0-40.5 36.0-37.0 37.0-39.5 38.6-39.48 38.6-40.0 39.5-40.5 749 749, Annex 2 749, Annex 1 749, Annex 2 749, Annex 2 749, Annex 3 3.5; 2.5 (patterns) 112 to 3.5 112
47、; 56; 28; 14; 7; 3.5 60(1)50(1)112 to 3.5 42 40.5-43.5 40.5-43.5 40.5-43.5 F.2005, Annex 1 F.2005, Annex 2 F.2005, Annex 3 112; 56; 28; 14; 7 Variable size blocks Mixed 112 to 7 and blocks 52 51.4-52.6 1496, Annex 1 56; 28; 14; 7; 3.5 57 55.78-57.0 57.0-59.0 1497, Annex 1 1497, Annex 2 56; 28; 14; 7
48、; 3.5 100; 50 8 Rec. ITU-R F.746-10 TABLE 2 (end) Band (GHz) Frequency range (GHz) Recommendations ITU-RF Series Channel separation (MHz) 70/80 71-76 GHz/81-86 GHz 71-76 GHz/81-86 GHz 71-76 GHz/81-86 GHz 74-76 GHz/84-86 GHz F.2006 F.2006, Annex 1 F.2006, Annex 2 F.2006, Annex 2 125 MHz (pattern) n 2
49、50 MHz blocks (n = 1, , 20) n 250 MHz channels (n = 1, , 18) n 250 MHz channels (n = 1, , 7) 94 92.0-94 / 94.1-95 F.2004 50, 100, N 100 (1)Frequency block bandwidth. NOTE 1 A given frequency channel arrangement can be regarded as either alternated or interleaved as a consequence of the symbol rate transmitted by the radio systems. Alternated frequency channel arrangements may be, in principle, further implemented with co-channel band reuse. NOTE 2 The definition and application of XPD is different from that of cross-polarizati
