1、Rec. ITU-R F.1335 1RECOMMENDATION ITU-R F.1335*TECHNICAL AND OPERATIONAL CONSIDERATIONS IN THE PHASED TRANSITIONALAPPROACH FOR BANDS SHARED BETWEEN THE MOBILE-SATELLITESERVICE AND THE FIXED SERVICE AT 2 GHz*(Question ITU-R 208/9)(1997)Rec. ITU-R F.1335The ITU Radiocommunication Assembly,consideringa
2、) that the mobile-satellite service (MSS) (Earth-to-space) and the fixed service (FS) are allocated frequencies ona co-primary basis in the band 1 980-2 010 MHz in all Regions and in the band 2 010-2 025 MHz in Region 2;b) that the MSS (space-to-Earth) and the FS are allocated frequencies on a co-pr
3、imary basis in theband 2 170-2 200 MHz in all Regions and in the band 2 160-2 170 MHz in Region 2;c) that these bands are widely used by the FS in many countries;d) that for many developing countries, the use of the 2 GHz band offers a substantial advantage for theirradiocommunication networks and t
4、hat it may not be attractive to transfer these systems to higher frequency bandsbecause of the economic consequences that this would entail;e) that Resolution 716 (WRC-95) concerning the use of the 2 GHz band by the FS and MSS and associatedtransition arrangements, encouraged administrations where p
5、racticable to draw up plans for the gradual transfer of thefrequency assignments to their FS stations in the shared 2 GHz MSS bands to non- overlapping bands, giving priority tothe transfer of their frequency assignments in the Earth-to-space band 1 980-2 010 MHz in all Regions and2 010-2 025 MHz in
6、 Region 2, considering the technical, operational and economic aspects;f) that the ITU-R has developed a new channel arrangement in Recommendation ITU-R F.1098 for the FS in the2 GHz band which will facilitate the introduction of 2 GHz fixed systems in bands not overlapping the 2 GHzMSS band;g) that
7、 Resolution 716 (WRC-95) requests ITU-R to develop planning tools necessary to assist thoseadministrations considering re-planning of their terrestrial networks to accommodate the MSS in the 2 GHz bands,recommends1 that administrations may take into account the material in the Annexes 1 to 4 when co
8、nsidering transitionalarrangements for the MSS and FS at 2 GHz._*This Recommendation was developed jointly by Radiocommunication Study Groups 8 and 9, and any further revision should alsobe undertaken jointly. This Recommendation should be brought to the attention of Radiocommunication Bureau.*In ac
9、cordance with Resolution 716 (WRC-95) of the World Radiocommunication Conference (Geneva, 1995), the frequencybands dealt with in this Recommendation are mainly in the bands 1 980-2 010 MHz (worldwide) and 2 010-2 025 MHz (Region 2)allocated to the MSS (Earth-to-space) and the bands 2 160-2 170 MHz
10、(Region 2) and 2 170-2 200 MHz (worldwide) allocated tothe MSS (space-to-Earth).2 Rec. ITU-R F.1335ANNEX 1Technical and operational considerations in the phased transitional approachfor bands shared between the MSS and the FS at 2 GHz1 IntroductionAn administration may choose to transition between s
11、ervices to facilitate the introduction of the MSS. In such cases,there is a need to determine the criteria under which it is deemed that interference will be caused or received for aspecific MSS system implementation, and the subsequent action or rules. This situation can arise either during a bilat
12、eralcoordination, or when an administration has decided to implement one or more specific MSS systems. Tools whichcould be used for this determination, for a single MSS system are currently being addressed in Recommen-dation ITU-R M.1319. The impact on transition planning due to interference from mu
13、ltiple MSS systems is still underinvestigation by ITU-R.The transition time-frame in this context is deemed to be between the time an administration makes spectrum availablefor MSS and the point at which it requires systems in the FS to move to spectrum outside that which is required for theimplemen
14、tation of the MSS system.Two aspects are dealt with in this Annex: the continued operation of fixed systems within the spectrum identified for MSS implementation for a reasonableperiod of time; and the continued operation of the FS systems in the 2 GHz range beyond this transition period, including
15、the necessaryplanning and coordination tools to move the system, or a portion of the system, to spectrum outside that which isrequired for MSS implementation. (See Resolution 716 (WRC-95) Requests 1.2.)2 Co-primary MSS allocations at 2 GHzPresently, the bands 1 980-2 010 MHz and 2 170-2 200 MHz are
16、allocated for MSSs on a worldwide basis co-primarywith the FS and mobile service. In Region 2 the band 2 160-2 170 MHz is also a co-primary allocation. As a result ofWRC-95, the band 2 010-2 025 MHz was allocated for MSS on a co-primary basis with the FS and mobile service inRegion 2.3 BackgroundThe
17、re are two principal radio-frequency channel arrangements used by the existing fixed systems, Recommen-dations ITU-R F.283 and ITU-R F.382. Recommendation ITU-R F.283 provides the channel arrangements for the twosub-bands 1 900-2 100 MHz and 2 100-2 300 MHz with six paired channels in each sub-band,
18、 each with a bandwidth of14 MHz. Recommendation ITU-R F.382 provides channel arrangements for the band 1 900-2 300 MHz with six pairedchannels, each with a bandwidth of 29 MHz, using two 29 MHz channel arrangements overlayed at a 14.5 MHz offset.These arrangements and their relationship with the cur
19、rent MSS allocations are illustrated in Fig. 1.Recommendation ITU-R F.1098, developed in response to Resolution 113 (WRC-92) as a result of the WorldAdministrative Radio Conference for Dealing with Frequency Allocations in Certain Parts of the Spectrum, Malaga-Torremolinos, 1992 (WARC-92) allocation
20、s, provides for three channel arrangements for new fixed systems in theband 1 900-2 300 MHz. It focuses on the “core” bands 2 025-2 110 MHz and 2 200-2 290 MHz wherein the FS, mobileand space operations, space research, earth exploration-satellite services (MS, SOS, SRS, EESS) share co-primaryalloca
21、tion space. These channel arrangement descriptions are illustrated in Fig. 2.Rec. ITU-R F.133531335-01C5C6C1C2C3C4C5C6C4C5C6C1C2C3C4D4D5D6D1D2D3D4D5D6D3D4D5D6D1D2D3D4D5A3A4A5A6A2A3A4A5B3B4B5B6B3B4B5B61 980 2 010 2 170 2 2001 990 2 010 2 025 2 160 2 1701 980 2 009 2 038 2 0672 193 2 222 2 2512 1642 1
22、93 2 222 2 2512 1642 009 2 038 2 0671 980 1 850FIGURE 1Recommendations ITU-R F.283 and ITU-R F.382 channel arrangements2 003.5PCS R2 MSSR2 MSSMSS (Earth-space) worldwide MSS (space-Earth) worldwideRec. ITU-R F.283 low and medium capacity analogue channelarrangement (Region 1 and Region 3)Rec. ITU-R
23、F.283 low and medium capacity analogue channelarrangement (Region 2)Rec. ITU-R F.382 medium and high capacity analogue channel arrangementRec. ITU-R F.382 medium and high capacity analogue channel arrangementinterstitial channels2 269.52 255.52 241.52 227.52 094.52 080.52 066.52 052.52 038.52 024.51
24、 975.51 961.52 220.5 2 234.5 2 248.5 2 262.51 961.5 1 975.5 1 989.5 2 080.52 066.52 052.52 038.52 024.52 010.5 2 178.52 164.52 150.5 2 192.51 968.5 1 982.52 255.52 241.52 227.52 213.5 2 269.52 017.5 2 031.5 2 059.5 2 073.5 2 087.52 045.5 2 101.51 968.5 1 982.5 1 996.5 2 017.5 2 031.5 2 045.5 2 059.5
25、 2 073.5 2 087.5 2 143.5 2 171.5 2 185.5 2 199.52 157.51 965.5 1 994.5 2 023.5 2 052.5 2 081.5 2 178.5 2 207.5 2 236.5 2 265.52 149.52 143.5 2 171.5 2 185.52 157.52 178.52 164.52 150.51 994.5 2 023.5 2 052.5 2 178.5 2 207.5 2 236.5 2 265.52 220.5 2 234.5 2 248.5 2 262.52 206.5FIGURE 1335-014Rec. ITU
26、-R F.13351335-021234561 970 2 010 2 160 2 2001 990 2 025 2 165 2 2001 2 3 4 5 612345 123451 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 710 118 91919114.1191011.141. .2 105 2 115.2 025.2 0151 975. 2 0051 925. 2 165. 2 195. 2 295FIGURE 2Recommendation ITU-R F.1098 channel arrangements1 969.51 955.51 941.51 927
27、.52 102.52 088.52 074.52 060.52 046.52032.52 277.52 263.52 249.52 235.52 221.52 207.52 094.52 080.52 066.52 052.52038.5 2 269.52 255.52 241.52 227.52 213.52 074.52 060.52 046.52 032.52 018.5 2 130.52 116.52 102.52 088.52 158.52 144.52 263.52 249.52 235.52 221.52 207.5 2 291.52 277.5Rec. ITU-R F.1098
28、, Annex 1Current MSS allocationsProposed MSS allocationsRec. ITU-R F.1098, Annex 1 as per channelalignment with Rec. ITU-R F.283Rec. ITU-R F.1098, Annex 2Rec. ITU-R F.1098, Annex 3FIGURE 1335-02Rec. ITU-R F.1335 5Annex 1 to Recommendation ITU-R F.1098 describes two channel arrangements which lie ent
29、irely within thecore bands for up to six go and six return channels with a carrier spacing of 14 MHz. An alternate description providesfor up to five go and return channel pairs where the centre frequencies align with the channels given in Recommen-dation ITU-R F.283.Annex 2 to Recommendation ITU-R
30、F.1098 describes a channel arrangement for the core bands as well as an extendedchannel arrangement for up to eleven “go” and “return” channel pairs with a carrier spacing of 14 MHz. The channelarrangement avoids the existing worldwide MSS allocation between 1 980-2 010 MHz and 2 170-2 200 MHz.Annex
31、 3 to Recommendation ITU-R F.1098 describes a channel arrangement for the core bands as well as an extendedchannel arrangement for up to nineteen “go” and “return” channel pairs with a carrier spacing of 10 MHz. The channelarrangements are based on the 190 MHz transmitter-receiver duplex spacing of
32、the current MSS allocation pairing.Allowance is made in Annexes 2 and 3 to Recommendation ITU-R F.1098 for extended channel arrangements whereadequate geographical and/or frequency separation would make sharing possible with MSS or future public land mobiletelecommunication systems (FPLMTS).4Impact
33、of worldwide MSS allocations on the fixed systems Recommenda-tions ITU-R F.283 and ITU-R F.382 channel arrangementsIn the Recommendation ITU-R F.283 channel arrangement, the guardband between transmitter/receiver (Tx/Rx) in eachof the sub-bands is 35 MHz and 39 MHz in Recommendation ITU-R F.382. The
34、 present MSS worldwide allocationtakes up 27.5 + 14.5 MHz of this 35 MHz guardband in Regions 1 and 3 and 7 + 0.5 MHz in Region 2.The following is the impact of the MSS worldwide allocation on each of the Recommendations: Recommendation ITU-R F.283 (Regions 1 and 3) 1 980-2 010 MHz 2.5 MHz of C6(Reg
35、ion 2) 1 980-2 010 MHz 2.5 MHz of D5(Region 2) 1 980-2 010 MHz 14 MHz of D6(Region 2) 1 980-2 010 MHz 6.5 MHz of D1(Regions 1 and 3) 2 170-2 200 MHz 1.5 MHz of C5(Regions 1 and 3) 2 170-2 200 MHz 14 MHz of C6(Region 2) 2 170-2 200 MHz 1.5 MHz of D4(Region 2) 2 170-2 200 MHz 14 MHz of D5(Region 2) 2
36、170-2 200 MHz 14 MHz of D6 Recommendation ITU-R F.382 (Arrangement) 1 980-2 010 MHz 14.5 MHz of A3(Arrangement) 1 980-2 010 MHz 15.5 MHz of A4(Offset arrangement) 1 980-2 010 MHz 29 MHz of B4(Offset arrangement) 1 980-2 010 MHz 1 MHz of B5(Arrangement) 2 170-2 200 MHz 8.5 MHz of A2(Arrangement) 2 17
37、0-2 200 MHz 21.5 MHz of A3(Offset arrangement) 2 170-2 200 MHz 23 MHz of B3(Offset arrangement) 2 170-2 200 MHz 7 MHz of B46 Rec. ITU-R F.13355 Impact of Region 2 MSS allocations on the fixed systems Recommenda-tions ITU-R F.283 and ITU-R F.382 channel arrangementsThe following is the impact of the
38、MSS Region 2 allocation on each of the Recommendations: Recommendation ITU-R F.283 (Regions 1 and 3) 2 010-2 025 MHz 7.5 MHz of C1(Region 2) 2 010-2 025 MHz 7.5 MHz of D1(Region 2) 2 010-2 025 MHz 7.5 MHz of D2(Regions 1 and 3) 2 160-2 170 MHz 10 MHz of C5(Region 2) 2 160-2 170 MHz 10 MHz of D4 Reco
39、mmendation ITU-R F.382 (Arrangement) 2 010-2 025 MHz 13.5 MHz of A4(Arrangement) 2 010-2 025 MHz 1.5 MHz of A5(Offset arrangement) 2 010-2 025 MHz 15 MHz of B5(Arrangement) 2 160-2 170 MHz 10 MHz of A2(Offset arrangement) 2 160-2 170 MHz 6 MHz of B36 Impact on Recommendation ITU-R F.1098The current
40、MSS worldwide allocation affects Recommendation ITU-R F.1098 as follows: Annex 1 Not affected Annex 2 0.5 MHz go and return channel 11 Annex 3 10 MHz of go and return channel 1110 MHz of go and return channel 1210 MHz of go and return channel 1310 MHz of go and return channel 14The current MSS Regio
41、n 2 allocation affects Recommendation ITU-R F.1098 as follows: Annex 1 Not affected Annex 2 13.5 MHz of channel 15.5 MHz of channel 11 Annex 3 10 MHz of channel 105 MHz of channel 910 MHz of channel 147 Operational dates for worldwide and Region 2 MSS allocations in the 2 GHz bandUsage of the worldw
42、ide MSS allocation bands 1 980-2 010 MHz and 2 170-2 200 MHz shall not commence before1 January 2000 (see Radio Regulations (RR) No. S5.389A).Usage of the worldwide MSS allocation band 1 980-1 990 MHz in Region 2 and of Region 2 MSS bands2 010-2 025 MHz and 2 160-2 170 MHz shall not commence before
43、1 January 2005 (see RR No. S5.389A andRR No. S5.389C) with the exception that in Canada and the United States of America usage of the latter bands by theMSS shall not commence before 1 January 2000 (see RR No. S5.389D).Rec. ITU-R F.1335 78 Transition principlesWhen an administration decides to imple
44、ment MSS, the following principles could be observed during the transitionperiod.To ease implementing MSS, the universe of FSs could be frozen: no expansion of existing fixed networks in bands that overlap MSS bands; and no new deployment of networks of existing fixed systems.When MSS is introduced
45、initially into FS bands, every effort should be made to coordinate and share spectrum betweenexisting FS and new MSS service. These coordinating efforts should take into consideration that: transition be considered where interference criteria predicts unacceptable interference to incumbent fixed net
46、worksor links or into MSS systems; transition be prioritized in MSS Earth-to-space bands, given the difficulties of sharing of FS systems with MSSuplinks (see Resolution 716 (WRC-95) resolves 4.3); in the long term as MSS traffic increases, total relocation may be desirable.Given that existing FS ne
47、tworks will be transitioned out of spectrum identified for MSS implementation, alternativespectrum (and/or alternative non-radio technology) could be identified to accommodate re-located existing fixedsystems: alternative spectrum should be bands that do not overlap spectrum identified for MSS (e.g.
48、 Recommen-dation ITU-R F.1098 or in higher frequency FS bands); expansion of existing FSs and new deployment of existing FSs should be implemented in alternative spectrum.Transition of existing fixed systems can occur over a reasonable time period, balancing the interests of existing FSoperators and
49、 new MSS operators. when existing licences expire or when equipment is amortized; after a reasonable period, fixed systems could continue to operate in spectrum required for MSS implementation ona no interference no protection basis.When a point has been reached when the FS systems are required to move outside the spectrum required toimplement MSS, the usual planning tools for system implementation can be used (Note 1).NOTE 1 For example, fixed systems can be accommodated in the Recommen
