TIA TSB86-1999 Criteria and Methodology to Assess Interference between Systems in the Fixed Service and the Mobile-Satellite Service in the Band 2165-2200 MHz《在固定业务中的系统和2165-2200 M.pdf

1、STD=EIA TSBb-ENGL 3999 3234600 Ob34732 198 m TIA/EIA TELECOMMUNICATIONS SYSTEMS BULLETIN Criteria and Methodology to Assess Interference Between Systems in the Fixed Service and the Mobile-Satellite Service in the Band 2165-2200 MHz OCTOBER 1999 TELECOMMUNICATIONS INDUSTRY ASSOCIATION NOTICE MIA Eng

2、ineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper

3、product for his parti and, one of the key issues in the FCCs 2 GHz Rulemalung is the extent to which this band can be shared between the MSS and these FS users. The Satellite Communications Division and Wireless Communication Division of TIA agreed to form the JWG with Terms of Reference as follows:

4、 1. Study the potential for sharing the band 2165-2200 MHz between satellite systems operatmg in the MSS and microwave systems opdg in the FS; 2. Detemiine the conditions under which sharing may be possible and the arrangements necessary for sharing to occur (if any); 3. Document the essential eleme

5、nts of the study with findings and conclusions that can be assessed by others not directly involved in the study and produce a TSB to be published by the TIA, 4. Follow the prescribed TIA rules of procedure (TIA Chairs Procedures Notebook), Legal Guide, Engineering Manual and other TIA guidance appr

6、opriate for the type of product being developed. This TSB-86 is prhady hiended to provide a methodology for evaluang MSS inte these references are available through the intemet by coflsulting the I”s web site (http:/www.itu.int). The readeduser of this document is advised that the methodologies pres

7、ented in Section 4 of the insant version of TSB-86 are valid only for evaluating MSS inte delineates methods for evaluating the associated potential interfirence (Sections 3,4 and 5); presents example applications for the methodology (Section 6) and discusses possible interference mitigation techniq

8、ues (Section 7). Effctive Januaq 1,2000, the frequency band 2165-2200 MHz will be allocated in the United States and Canada to both the FS and MSS (space-to-Earth). However, in accordance with the ITU Radio Regulations (RR), the subject fkquency sharing situations can also arise in the 2160-2165 MHz

9、 band. General background information on internaticmal and domestic coordination of proposed 2 GHz MSS systems (with terrestrial FS) is provided in the subsequent sub-sections. 1.2 Frequency Coordination As of December 15, 1998, the MSS networks listed in Table 1-1 and Table 1-2 have been “Advanced

10、Published” with the International Telecommunication Union 0 for operation in the band 2 160-2200 MHz. Operators of some, but not necessarily all of these systems have applied to the FCC to serve mobile tarninals in the United States. This fact notwithstanding, foreign MSS networks can p0tent;aUy cau

11、se inkrfkrence to US FS systems whether or not they are providing service within the US. As illustrated in Figure 1-1, the FCC, on behalf of the US FS operators, can request coordination in cases where either the power flux density (PFD) or fractional degradation in performance (FDP) thresholds for

12、coordination are exceeded and, if applied, the Standard Computation Program (SCP) indicates that the applicable interference thresholds are exceeded. The methodology presented herein for evaluating potential interference is consistent with the RR coordination procedures and will be useful to the US

13、FS community in support of its international frequency coordination endeavors. In order to accrue US rights to use the 2165-220 MHz MSS resources, the FCC has Advanced Published with the ITU certain of the MSS systems listed in Tables 1-1 and 1-2 e., the systems for which “USA” is listed as the admi

14、nistr;tti on). These systems are representative of anticipated US MSS systems. The methodology presented is for evaluating potential intmfrence between MSS and FS systems. The FCC has received nine applications to use 2165-2200 MHz MSS resources in the United States. FCC, ET Docket No. 95-18 (FCC 2

15、GHz Order), released March 14,1997. Also see FCC, ET Docket No.95-18, 1 Memorandum Opinion and Order 4 10 to 12 GSO -preferably 80“ W, 10“E, 100“ E and 170W 8 8 for non-GSO 2 53“ 16 16 30“ NIA 60“ for 12 satellite configuration; 72 for 10 sat configuration 1420 for non-GSO, 10,355 35750 (nom) for Al

16、titude (km) 850 (nom) 20,181 Multiple Beam Antenna 37 Antenna Type # Beams Antenna Antenna Antenna non-GSO: 96 GSO 64 Polirization Antenna Type RHCP LHCP RHCP Non-Directional Non-Directional Non-Directional RHCP and LHCP Non-Directional Design (Note 3) -24.8 ATN: -17.55 (derived) -24.5 (derived) -23

17、.8 TIS: -19.3 AT“: CDMA S-E Service I Link Access Scheme Data: CDMA/FDMA 106“ - 112“ W with 106.5“ W preferred 1 (Initiai) 3 (Total - Future); # 1 : 90 - loo“ w, #2: 65“ - 75“ W, #3 110“ - 120“ w 1 1 Longitudinal spread 2 1 O 35,750 (nom) NIA 35,750 (nom) Space Station Design Multiple Beam Multiple

18、Beam Antenna Antenna 480 72 Polarization I Circular I RHCP RHCP RHCP User Terminal Design Non-Direc tional Antenna Type Receive G/T (dBW Non- Directional -26 -10 to -24 Transportable: -14.0 S-E Service Link Parameters Access Scheme CDMA #1: 20“ E, #2: 110“ E, #3: 170“ Space Station Design UserTermin

19、alDesign S-E Service Link Parameters (1) Borealis - 2G 3 planes (all Elliptical) w, M: 90“ w # Planes 1 Satellite Separation Altitude (Km) 35,750 (nom) Antenna Type Multiple Beam Antenna # Beams 120 to 300 Polarizaton LHCP AntennaType Directional and Non-Directional Receive G/T (dBK) Access Scheme m

20、MA Frequency (GHz) Function of which satellites considem -16 to -6 Uplink: 1.980 - 2.025 Downlink: 2.160 - 2.200 Modulation 5 satellites/plane Elliptical (Apog: 75 13.4 km, Perig: 674.3 km, inc: 116.6“) Concordia - 2G 2 planes (1 Elliptical and 1 Circular) 5 satellites in elliptical plane; 6 satelli

21、tes in circular plane Elliptical (Apog: 7975.7 km, Perig: 4285.6 km, Inc: Equatorial) circular (Alt: 7747.3 km) Spacing: 72“ Spacing: 72“ (Elliptical), 60“ (Circular) (2) The Boeing MSS system is proposed to be used for the provision of Communcations, navigation, and surveillance services for global

22、 avionics commonly refzed to as Aeronautical Mobile-Satellite (Route) Services. In this context, ATN refers to the Aeronautical Telecommunications Network and TIS refers to Traffic Modon Services. A“ supports two-way communications while TIS is only a one-way, ground-to-satellite- aimaft broadcast l

23、ink. (3) The user temiinal for the Boeing MSS system is an airrraft temiinal. STD*EIA TSBBb-ENGL 1999 3239bDD Db319752 TBb D TIA/EIA/TSB 86 3. Interference Criteria for MSS Downlink Interference into FS Receive Stations TA Bulletin TSB- 1 OF (Interfmce Criha for Microwave Systems) provides the inter

24、fimce criteria that are in use for fkequency coordination within the fixed service in the US The implicit assumptions and level of detailed information that is built into the criWia of TSB-1OF may not all be appropriate for sharing between MSS and FS system. The objective of this section is to provi

25、de MSSFS interference criteria at an equivalent level of pe15ormance protection to the fixed service while affording the maximum operational Mom to the mobile satellite service. 3.1 Background A key charactenstic of the intaference from MSS satellites that must be accommodated is its time variabilit

26、y. The interfaence criteria in Bulletin TSB-1OF were developed to address intafering signals with non-varying power. (Even in the case of an interfm using ATPC, coordination is conducted with these criteria by placing suitable requirements on the implementation of the power control.) This does not m

27、ean that the interhing signals hm fixed savice transmitters do not occuf with time-varying levels at an interfered-with receiver, but rather, that the variations are independent of and less severe (milder) than the variations of the desired signai. In the case of interference from non-GSO MSS satell

28、ites, there is a large component of variability in the received interference due to the regular motion of all the satellites in a uniform constellation. While these variations can be examined through cornputer simulation and modeling, heretofore thm have been no appropriate US FS interfmce criteria

29、to use as a measure of acceptability. In siuations where the interfrmce power is variable, the usual engineering practice has been to require codormance with both long-term and short-term interference criteria Such an approach is taken in earth station coordination and in the l7W-R in sharing studie

30、s between the FS and the MSS. In this context, the interference criteria of Bulletin TSB- 1 OF may be considered to be long-term criteria. The long-term criteria are criteria that must be met by an interfm for all but 20 percent of the time. (while other percentages could be used, the 20 percent lev

31、el has been used internationally by the fixed service for many years.) During the time that the inkrfiring signai power exceeds the long-term critaia, it is expected to be statistically well behaved, and to exceed a threshold level sigrilficantly greater than the long-term level only very rarely. Th

32、is higher inexfmce threshold level is referred to as a short- term interference criterion and corresponds to a performance degradation not to be exceeded at the system level for more than some d percentage of time (typically much less than 1% of the time). The following section provides the criteria

33、 that repment the maximum pemiissible levels of interference when coordinating MSS downlinks with respect to FS receiving stations. 15 STD.EIA TSBBb-ENGL L999 m 3234b00 Ob34753 412 = TLA/EIA/TSB 86 3.2 Criteria for MSS Interference Into FS Receivers The criteria for interfrence Fom MSS systems provi

34、ded in the following sections are to be applied on a per-Zink basis, including multi-hop FS systems. Section 3.2.1 addresses MSSFS ineemce criteria for analog FS links while section 3.2.2 addresses the interference criteria for digital FS links. 3.2.1 Analog Link Interference Criteria For analog lin

35、ks, a further distinction is made between MSS-only interfmce noise power criteria and agpgak noise power criteria As the name suggests, MSS-only intmmce noise power criteria applies to the additional intdkrence noise power contribution that resuits hm the MSS intdhing signais. Aggregate noise power

36、dteria, on the other hand, applies to the aggtegate of thermal noise power and MSS interfrence noise power and takes into account multi-path fading and other sources of noise Within the FS system. Long- and short-term “MSS-only interference noise power“ criteria are provided in Section 3.2.1.1 while

37、 long- and short-term “aggregate noise power“ criteria are presented in Section 3.2.1.2. 3.2.1.1 Criteria for MSS-Only Interference Noise Power The MSS-only inemce noise power criteria for MSS/FS interference evaiuations are shown pictorially in Figure 3-1. Thm are both long-term and short-term crit

38、eria that must be met, Recommended values for the long-term and short-term MSS-only interfaence noise power criteria are: LongTd: X pWOp not to be exceeded for more than 20% of the time where X is defmed as follows: a. For a FS route length greater than 400 h, X = 20 pWOp per 4 kHz at baseband b. Fo

39、r a FS route length less than or equal to 400 km (or for routes of unlcnown length) X = max (25,250n) pWOp per 4 kHz at baseband The long-tenn criterion of 20 pWOp for FS route lengths greater than 400 km was determined by linearly apportioning the 12-hop, 240 pWOp criteria identified in RR Appendix

40、 S5 (Resolution 46 (rev wRC-97), Annex 2) on a single-hop basis. The long-term criterion for FS routes less than or equal to 400 km was taken fiom Annex A of TSB-1OF. 2 16 STD-EIA TSBBb-ENGL 1994 M 323Lib00 0634754 859 TIA/EIA/TSB 86 where n = number of hops Short Term: 50,000 pWOp per 4 IrHz at bas

41、eband not to be exceeded for more than 0.0002% of the time Long Term / Criterion ! ! ! J Short Term Criterion MSS Noise Power (pWp) Figure 3-1 MSS-Only Interference Noise Power Criteria for Analog Links 3.2.1.2 Limits for Aggregate Noise Power The aggregate noise power criteria for evaluations of MS

42、S intaference to an analog FS link are shown pictorially in Figure 3-2. As discussed furuier below, the three aggregate noise power thresholds (one long-term and two short-term thresholds) are assumed to exclude noise power generated by intermodulation within the FS system. The recommended values fo

43、r the long-term and short-term aggregate noise power criteria are: Long Term: 150 pWOp per 4 kHz at baseband not to be exceeded for more than 20% of the time Short Term I: 50,000 pWOp per 4 kJ3z at baseband not to be exceeded for more than 0.002% of the time 0 Short Term II: 1,000,000 pWOp per 4 kHz

44、 at baseband not to be exceeded for more than 0.0002% of the time 17 STD-EIA TSBBb-ENGL 1997 m 3239b00 Ob39755 795 = TIA/EIA/TSB 86 The long-term and short-term criteria wm detemiined by linearly apportioning the 50-hop litnits identified in Recommendation ITU-R F.3934 on a single-hop basis. Specifi

45、cally, for the long-tam criterion, the power threshold of 7500 pWOp (IT-R F.393-4) was divided by 50, yielding 150 pWp, on a per-hop basis. For the short-term I and IT critena, the percentages of times (in U-R F.393-4) of 0.1% and 0.01% were divided by 50 to obtain 0.002% and 0.0002%, respectively.

46、Long Term / Criterion Short Term I Short Term ! J Criterion ! I II r Aggregate Noise Power (pWOp) Figure 3-2 Aggregate Noise Power Criteria for Analog Links Typically, a significant portion of the long-tern aggregate noise power in the circuits at the temiuiatrn g receiver of an analog FS system ari

47、ses fiom intermdation of desired signals within the FDM payload carried by the FS system. However, inclusion of the intermodulation noise power component in calculaions of the long-term -gate noise power for an individual FS link would greatly complicak the analysis. Two approaches were considered f

48、or eliminating the need to calcula* intermodulation noise power levels: (1) reduce the aggregate noise power threshold by a typical level of intermodulaiion noise power, or (2) assume the impact of intermodulation noise power contribution is offset by the shorter lengths of current systems. The latt

49、er approach was taken in setting these specified criteria. In particular, the aggregate noise power criterion of Recommendation ITU-R F.3934 is specified for a refmnce hypothetical 2500 km FS system comprised of 50 hops. However, most analog 2 GHz FS systems have fewer than 50 hops, and it is assumed that the specified interference power can be applied equally to each of these. For comparison, a 12-hop reference system is assumed for assessing Intermodulation noise is assumed to comprise a negligible portion of the short-term aggregate noise 3 power and nee