Interference Reduction: Antenna Selection and TiltsBy Alpesh ShahRichard GodleyEricsson Confidential INTERFERENCE REDUCTIN: ANTENNA SE!ECTIN AND TI!TS "A#enda$er$ie%Antenna Selection & 'orti(ontal )attern& *ertical )atternTiltin#& Inital )lannin#& )re and )ost !aunch pti+i(ation& n#oin# pti+i(ation,NCS,-RR)- DataConclusionsEricsson Confidential INTERFERENCE REDUCTIN: ANTENNA SE!ECTIN AND TI!TS .$er$ie% Because All cells are usin# the sa+e Fre/uency in U-TS0 interference is not controlla1le %ith fre/uency plannin# li2e it is the case in GS-,ith GS- Fre/uency )lannin# it is possi1le to co+pensate for su13opti+al cell plannin# as lon# as sufficient spectru+ is a$aila1le4)ara+eter settin#s in the net%or2 can co+pensate less for su13opti+al cell plannin# than %ith GS-,ith U-TS syste+s interference is 2ept under control 1y cell plannin# +ainly0 ie site selection0 antenna hei#ht0 antenna type 5 tiltsEricsson Confidential INTERFERENCE REDUCTIN: ANTENNA SE!ECTIN AND TI!TS 6$er$ie% cont7d Ad8acent cells %ith lar#e o$erlappti+al desi#n0 sharp cell ed#e0 s+all o$erlap li+itin# nu+1er of potential ser$ersSu13opti+al desi#n0 lar#e cell o$erlap0 hi#h nu+1er of potential ser$ersAd8acent cells %ith s+all o$erlapEricsson Confidential INTERFERENCE REDUCTIN: ANTENNA SE!ECTIN AND TI!TS 9Antenna Selection & 'ori(ontal )atternTrade3off 1et%een co$era#e and Interference0 'i#h 'ori(ontal 1ea+%idth leads to #reater co$era#e 1ut also hi#her interference4 In this +ar2et :;?0 therefore re/uirin# a##ressi$e tilt to control si#nalC4"? $ertical 1ea+%idth0