Recommendation ITU-R M (03/2006)

Transcription

1 ecommendaton ITU- M.64- (3/26) A methodology fo co-channel ntefeence evaluaton to detemne sepaaton dstance fom a system usng hgh-alttude platfom statons to a cellula system to povde IMT-2 sevce M ees Moble, adodetemnaton, amateu and elated satellte sevces

2 ec. ITU- M.64- Foewod The ole of the adocommuncaton ecto s to ensue the atonal, equtable, effcent and economcal use of the ado-fequency spectum by all adocommuncaton sevces, ncludng satellte sevces, and cay out studes wthout lmt of fequency ange on the bass of whch ecommendatons ae adopted. The egulatoy and polcy functons of the adocommuncaton ecto ae pefomed by Wold and egonal adocommuncaton Confeences and adocommuncaton Assembles suppoted by tudy Goups. Polcy on Intellectual Popety ght (IP) ITU- polcy on IP s descbed n the Common Patent Polcy fo ITU-T/ITU-/IO/IEC efeenced n Annex of esoluton ITU-. Foms to be used fo the submsson of patent statements and lcensng declaatons by patent holdes ae avalable fom whee the Gudelnes fo Implementaton of the Common Patent Polcy fo ITU-T/ITU-/IO/IEC and the ITU- patent nfomaton database can also be found. ees of ITU- ecommendatons (Also avalable onlne at ees BO B B BT F M P A A F M NG TF V Ttle atellte delvey ecodng fo poducton, achval and play-out; flm fo televson Boadcastng sevce (sound) Boadcastng sevce (televson) Fxed sevce Moble, adodetemnaton, amateu and elated satellte sevces adowave popagaton ado astonomy emote sensng systems Fxed-satellte sevce pace applcatons and meteoology Fequency shang and coodnaton between fxed-satellte and fxed sevce systems pectum management atellte news gatheng Tme sgnals and fequency standads emssons Vocabulay and elated subects Note: Ths ITU- ecommendaton was appoved n Englsh unde the pocedue detaled n esoluton ITU-. Electonc Publcaton Geneva, 2 ITU 2 All ghts eseved. No pat of ths publcaton may be epoduced, by any means whatsoeve, wthout wtten pemsson of ITU.

3 ec. ITU- M.64- ECOMMENDATION ITU- M.64- * A methodology fo co-channel ntefeence evaluaton to detemne sepaaton dstance fom a system usng hgh-alttude platfom statons to a cellula system to povde IMT-2 sevce (23-26) cope Ths ecommendaton contans a methodology fo evaluatng co-channel ntefeence and a sepaaton dstance between a hgh-alttude platfom statons (HAP) system as a base staton fo IMT-2 and a teestal towe-based cellula system povdng IMT-2 sevce. Annex descbes a methodology fo co-channel ntefeence evaluaton fom a HAP base staton and cellula base statons to a cellula moble staton to povde IMT-2. The C/I ato s used as a cteon to set sepaaton dstance between a HAP system and a cellula system. Fo evaluatng the ntefeence wthn a cellula system, a smplfed extended veson of Hata s model s appled. An example of calculaton fo the sepaaton dstance between a HAP system and a cellula system s contaned n Annex 2. Appendces and 2 pesent the equatons fo ntefeence calculatons used n Annex and the antenna adaton patten, espectvely. The ITU adocommuncaton Assembly, consdeng a) that new technology utlzng hgh-alttude platfom statons (HAP) n the statosphee s beng developed; b) that WC-2 made povson fo use of HAP povdng IMT-2 n the bands MHz, MHz and MHz n egons and 3 and MHz and MHz n egon 2; c) that esoluton 22 (WC-3) equested studes on shang between HAP and othe statons wthn IMT-2, and consdeed the compatblty of HAP wthn IMT-2 wth some sevces havng allocatons n the adacent bands; d) that, n accodance wth No A of the ado egulatons (), HAP may be used as base statons wthn the teestal component of IMT-2 n the bands MHz, MHz and MHz n egons and 3 and MHz and MHz n egon 2; the use by IMT-2 applcatons usng HAP as base statons does not peclude the use of these bands by any staton n the sevces to whch they ae allocated and does not establsh poty n the, ecommends that the methodology n Annex should be used as gudance fo detemnng sepaaton dstance between HAP systems and cellula systems to povde IMT-2 sevce n the fequency bands n consdeng b) above. * Ths ecommendaton should be bought to the attenton of adocommuncaton tudy Goup 9.

4 2 ec. ITU- M.64- NOTE ecommendaton ITU- M.456 should be efeed to fo the typcal paametes egadng a HAP system fo shang studes between a HAP IMT-2 and a cellula sevce n the fequency bands n consdeng b) above. Annex A methodology fo co-channel ntefeence evaluaton to detemne sepaaton dstance fom a system usng HAP to a cellula system to povde IMT-2 sevce Intoducton ecommendaton ITU- M.456 povded a co-channel spectal powe flux-densty (spfd) lmt on HAP emssons and out-of-band spfd lmts on HAP emssons on the Eath s suface, as well as HAP pefomance equements to potect teestal moble statons and fxed statons opeatng n bands adacent to tansmssons fom HAP. Howeve, fo desgnng a cellula system, the mult-uses ntefeence n the system should be consdeed as well as othe sevces ntefeences; the spectum effcency depends on the ntefeence fom the same and adacent cells. In ths ecommendaton, gudance s povded to estmate the co-channel ntefeence effects nto the teestal cellula IMT-2 system, whch s towe-based, fom a HAP IMT-2 system consdeng two ntefees: the same and adacent cells ntefeence n the cellula system tself, and the HAP IMT-2 ntefeence. nce HAP IMT-2 ntefeence s based on the HAP antenna patten descbed n ecommendaton ITU- M.456, ths patten s used to evaluate the appopate ntefeence powe of cellula systems so that all ntefeence powe can be deved. The ntefeence to a cellula moble staton fom cellula base statons and a HAP base staton s estmated n tems of the C/I wth the paametes of the HAP system such as the numbe of uses pe cell, cell adus, and tansmsson powe. Fo each estmated case, the optmum values ae detemned fo the above paametes n the HAP IMT-2 system n ode to be compatble wth the cellula system. Ths ecommendaton wll gve gudance fo evaluatng the sepaaton dstance between a HAP IMT-2 system and a cellula IMT-2 system to IMT-2 sevce povdes usng those dffeent systems.

5 ec. ITU- M ystem model 2. HAP IMT-2 HAP s beng developed n accodance wth ecommendaton ITU- M.457 to possbly povde IMT-2 sevce n the MHz, MHz and MHz n egons and 3, and MHz and MHz n egon 2. In addton, HAP as a base staton to povde IMT-2 wll have ts antenna patten compled wth the followng: 2 G ψ ψ fo ψ ψ m 3( / b) db G + db fo ψ < ψ ψ ( ψ) = m L 2 G N () X 6 log( ψ) db fo ψ2 < ψ ψ3 L db fo ψ3 < ψ 9 F whee: G(ψ): G m : ψ b : L N : L F = gan at the angle ψ fom the man beam decton (db) maxmum gan n the man lobe (db) one-half the 3 db beamwdth n the plane of nteest (3 db below G m ) (degees) nea-nsde-lobe level (db) elatve to the peak gan equed by the system desgn, and has a maxmum value of 25 db G m 73 db fa sde-lobe level (db) ψ = ψ L N / 3 degees ψ 2 = b 3.745ψb degees X = G m + L N + 6log( ψ2) db X L F ψ 3 = 6 degees. The 3 db beamwdth (2ψ b ) s agan estmated by: ψ b = degees. G m whee G m s the peak apetue gan (db). 2.2 Popagaton model Fo the cellula system, a smplfed extended veson of Hata s model s consdeed and fo the HAP system, the fee space loss model s used. Ths fee space loss model s adequate fo a hgh elevaton angle and t should be used wth pecauton fo low elevaton angles, untl a bette model s developed fo HAP systems; at that tme ths methodology should be evewed mplfed model of an extended veson of Hata s model An extended veson of the Hata's model n equaton (2) s wdely used fo the ado channel modellng of cellula systems n uban aeas wth a base staton antenna heght of 3 m and a moble antenna heght of.5 m.

6 4 ec. ITU- M.64- L = log ( F) log ( ) (2) 25 whee: L: path loss (db) F: fequency (MHz) : ange (km). The geneal use of the fouth powe path loss law n teestal cellula netwoks as a smplfed extended veson of Hata s model s appled as shown n equaton (3) to smplfy the devaton of the fomula Fee space loss model L = log ( F) + 4log ( ) (3) 25 whee: L: path loss (db) F: fequency (MHz) : ange (km). L =.4+ 2log ( F) + 2log ( ) (4) 32 3 C/I analyss at a cellula moble staton and the equed C/I to detemne the sepaaton dstance between HAP system and cellula system 3. C/I analyss at a cellula moble staton Fgue shows the ntefeence model to a cellula moble staton fom cellula base statons and the HAP base staton. An ntefeed cellula moble staton s assumed to be located at the neaest pont of the HAP sevce aea as shown n Fg.. The ntefeence powe eceved by a cellula moble staton can be obtaned by equaton (5), takng nto account the ntefeence fom the cellula base statons and the HAP base staton (see Appendx ). nce the cellula moble staton s located at the bode of the coveage of the cellula system, t s assumed that the nta-cell ntefeence s neglgble. N G c ( ϕ ) n c G hn hn hnm 4 2 I = I + = + Cellula IHAP Kc dnm Khhndh (5) n= m= m= whee: α : : M : l : c n : voce actvty facto n cellula system cellula fowad lnk powe fom cellula base staton to the use at the edge of each cell (mw) numbe of cellula uses pe cell cellula system path loss pe klomete numbe of ntefeng cells of n-th te n cellula system (= 2n +, n: ntege) N: numbe of te

7 ec. ITU- M.64-5 c hn : numbe of HAP ntefeng beams n n-th te wthn a dstance of (2N-) (HAP cell adus) aound the edge of the vctm cell unde consdeaton d nm : dstance between a cellula moble staton and cellula base statons (km) d h : dstance between a cellula moble staton and HAP base staton (km) ϕ hnm : angle between a cellula moble staton and the beam decton of cell seved by the HAP base staton (degees) hn : HAP fowad lnk powe fom HAP base staton to the use at the edge of HAP cell located n n-th te (mw) G : antenna gan of the base staton n cellula system G hn : gan of the antenna as expessed n equaton () accodng to te αml K c = 3 α h : M h : l h : K h = α h M l h h voce actvty facto n the HAP system numbe of HAP uses pe cell HAP path loss pe klomete. The C/I ato of a cellula moble staton can be obtaned by equaton (6). G 4 PF ( ) l C / I = (6) I

8 6 ec. ITU- M.64- whee: P F ( ): : : tansmtted powe dedcated fo one use lnk at dstance dstance between the cellula base staton fo cae and the -th cellula use cellula cell adus (km). 3.2 The equed C/I to detemne the sepaaton dstance In ths ecommendaton, the sepaaton dstance s defned as a dstance fom the HAP coveage contou to the coveage contou of the neaest cell sevng the ntefeed cellula moble staton. In ode to shae the spectum between the HAP system and the cellula system to povde IMT-2 sevce n adacent aea, t s necessay to set an appopate sepaaton dstance. The equed C/I n a cellula CDMA s expessed by equaton (7): E = b ( C / I) b eq (7) I Bc whee: E b : the enegy/bt I : ntefeence powe/hz b : bt/s B c : ado channel bandwdth (Hz). Annex 2 Example of calculaton of sepaaton dstance between a HAP system and a cellula system to povde IMT-2 sevce Paametes fo C/I calculaton Table shows paametes and values used to calculate the C/I at a cellula moble staton fom a HAP base staton and cellula base statons. Paamete TABLE Paametes fo C/I calculaton Value Fequency (MHz) 95 Numbe of uses pe cellula cell 5 Numbe of ntefeng tes 5 Cellula cell adus (km) Cellula tansmsson powe pe use (mw) HAP alttude (km) 2 adus of HAP cell coveage (km) 55 Cellula voce actvty facto (α ).375 HAP voce actvty facto (α h ).375

9 ec. ITU- M.64-7 If E b /I, b and B c s 4.5 db, 8 kbt/s, and.25 MHz, espectvely, equed C/I, (C/I) eq s obtaned db by equaton (7). The C/I obtaned by equaton (7) s used as a cteon to detemne the sepaaton dstance between a HAP system and a cellula system fo IMT-2 sevce. 2 Calculaton of sepaaton dstance Fo the ntefeence analyss of a cellula system, n ths example 7.4 db of C/I s used as a cteon fo the ntenal desgn C/I of the teestal cellula system and s used to detemne the sepaaton dstance between a HAP system and a cellula system. Ths cteon should be consdeed as a lmt fo an opeaton of a moble staton; nomally the ctea used s moe stngent. The numbe of ntefeed tes s assumed to be up to 5, because the addtonal ntefeence s neglgble fo a numbe of tes geate than 5. The maxmum antenna gan of the HAP base staton s consdeed to be adequate accodng to the HAP cell adus. Fom equaton (5) and the above consdeatons, the calculated C/I as a functon of the sepaaton dstance ae shown n Fgs. 2, 3 and 4 fo the smplfed extended Hata s model, takng nto account the numbe of uses pe cell, tansmsson powe and cell adus fo HAP, espectvely. FIGUE 2 C /Ivs. sepaaton dstance wth dffeent numbes of HAP uses pe cell

10 8 ec. ITU- M.64- FIGUE 3 C /I vs. sepaaton dstance wth dffeent tansmsson powe

11 ec. ITU- M.64-9 FIGUE 4 C /I vs. sepaaton dstance wth dffeent HAP cell ad Fgue 2 shows C/I as a functon of the sepaaton dstance, takng nto account the numbe of HAP uses pe cell. The C/I values at a cellula moble staton ae below the theshold value of 7.4 db at the contact pont of the two systems. When the HAP tansmsson powe pe use s mw and the HAP cell adus s 2 km, the sepaaton dstances needed between the two systems ae: 7.2, 8.8,.8 and 4. km fo the numbes of HAP uses pe cell of 5,, 2 and 5 espectvely, as shown n Table 2. Fgue 3 shows C/I as a functon of the sepaaton dstance, takng nto account HAP tansmsson powe pe use. The C/I values at a cellula moble staton ae below the theshold value at the contact pont of the two systems. When the numbe of HAP uses pe cell s 5 and the HAP cell adus s 2 km, the sepaaton dstances needed between the two systems ae: 7.2,.5, 4. and 7.4 km fo the tansmsson powes pe use of, 5, and 2 mw espectvely, as shown n Table 3. Fgue 4 shows C/I as a functon of the sepaaton dstance, takng nto account HAP cell adus. The C/I values at a cellula moble staton depend on the HAP cell adus. When the numbe of HAP uses pe cell s 5 and the tansmsson powe pe cell s mw, the sepaaton dstances needed between two systems ae: 8.3, 7.2 and 5 km fo HAP cell ad of 4, 2 and km espectvely, as shown n Table 4.

12 ec. ITU- M.64- In the example of calculaton wth C/I = 7.4 db, the C/I whch would have been obtaned assumng cellula deployment only (.e. wthout HAP) s about 8 db, whch means that a sgnfcant magn s allowed fo extenal ntefeence. In the second example of calculaton, t s assumed that C/I would be lmted to 2 db. HAP uses pe cell TABLE 2 epaaton dstance wth numbe of HAP uses pe cell C/I = 7.4 db epaaton dstance (km) C/I = 2 db HAP powe (mw) TABLE 3 epaaton dstance wth tansmsson powe C/I = 7.4 db epaaton dstance (km) C/I = 2 db HAP cell adus (km) TABLE 4 epaaton dstance wth HAP cell adus C/I = 7.4 db epaaton dstance (km) C/I = 2 db

13 ec. ITU- M.64- Appendx to Annex Devatons of the ntefeence between a HAP system and a cellula system Intefeence to a cellula moble staton. Intefeence fom a cellula base staton The tansmsson powe of a cellula base staton consdeng smplfed powe contol laws s gven by: ) ( F P = < < 4 4 fo fo (8) whee: : cellula cell adus : dstance to -th moble staton wthn one cell P F ( ): powe tansmtted fom the cell ste to the -th cellula use. Let P c denote the aveage powe tansmtted fom the cellula base staton. Followng the powe contol law n equaton (8), P c s expessed by: + ρ π = + πα ρ = π ρ = α d d 2 d 2 ) ( α F c P P (9) whee: ρ : use densty. If 2 M π = ρ, then P c s ewtten by: + = 6 3 α c M P ()

14 2 ec. ITU- M.64- If beakpont ange, =.55, then Theefoe, equaton () becomes: αm P c = () 3 The total ntefeence fom cellula base statons nto a cellula moble staton s gven by: N cn G N α c 4 4 = = Ml G n I Cellula lpc dnm dnm = = 3 n m n= m= (2).2 Intefeence fom a HAP base staton The powe pe cell n n-th te tansmtted fom a HAP base staton, P hn, s expessed by equaton (4).To scale the same eceved powe level at the edge of the cell n each sevce egon, HAP tansmttng powe pe use n sevce aea would be assumed as the followng. hn = ( P hn = α M (3) h hn h ( G/) 2 l dh l ( G /) 4 h hn Gh( n ) /) 2 dhn ( Ghn /) 2 dh( n ), n = h( n ), n 2 whee: hn : HAP fowad-lnk powe fo the use at the edge of HAP cell located n n-th te d hn : dstance fom a HAP base staton to a HAP moble staton of n-th te located n the neaest pont of cellula coveage. The total ntefeence fom HAP base statons to a cellula moble staton s gven by: whee: IHAP N c Ghn ( ϕhnm ) N c Ghn ( ϕhnm ) hn hn 2 2 = α lhph dh hm hlhdh hn (4) n= m= n= m= = d h = h : h s : 2 2 h h s + dstance fom a HAP nad to a cellula moble staton alttude of a HAP.

15 ec. ITU- M.64-3 Appendx 2 to Annex Antenna adaton pattens efeence adaton patten used (ecommendaton ITU- M.456) The chaactestcs assumed fo the efeence adaton patten ae shown n Fg. 5 consdeng antenna maxmum gans of 23 db, 35 db and 5 db, espectvely.