Use of WiFi-Based Intercom Devices to Eliminate Radio Lease Cost and Interference IssuesOsabel, Ganem, !araan, "omali # $elecom, B%, $"D-%"D # &'DEED $ecnical Innovation Wee( )*+,Use of WiFi-Based Intercom Devices to EliminateRadio Lease Cost and Interference IssuesL. Osabel, M. Al-Ghanem, N. Al-Jaraan, M. Al-Somali, 2013Building Mainenan!e Se!ion, "e!hni!al Ser#i!es $e%armen & MS$SAB'( & Saudi 'ron and Seel (om%an) *+adeed,, Jubail, -ingdom o. Saudi ArabiaAbstract"heiner!omde#i!es in+adeed!ranes use.i/edradiorans!ei#ers o%erainginmariimena#igaion .re0uen!) rangeo. 110 o130Megaher2. "his .re0uen!) isregulaed b) he go#ernmen and mus be leased and li!ensed .or legal use. "here are13 li!ensed .re0uen!ies .or he handheld radio de#i!es o. 'S$ 4hi!h !oss SA5 630,000annuall)*'S$, 2010,.+o4e#er,here are37!ranesha usehe mariime.re0uen!)4ihou li!enses. "he am%liude or signal srengh is deliberael) aenuaed so ha i 4illonl) !o#er a #er) small area 4ihin he disan!e !o#erage o. he !rane radio s)sem andno disurb he organi2aions ha migh be li!ensed o use i. "hese radio .re0uen!ieso.en had iner.eren!es 4ih he oher organi2aions su!h as he miliar) and !ommer!ialradio saions 4ihin range, !ausing legal issues and oher in!on#enien!es in!ommuni!aions."oeliminaelease!os andradioiner.eren!e, heuseo. he8i9i is%ro%osedinre%la!emen o mariime radio. "his )%e o. digial!ommuni!aions %roo!ol4illma:ehe iner!om s)sem more ada%able o o%en-ended !ommuni!aions %la.orm 4hi!h ison he rise no4ada)s.8i9i-basediner!omde#i!esareno normall)a#ailable!ommer!iall). Bu 4ihhe%ro%er uili2aion and !ombinaion o. e/ising e!hnolog), he 4ireless iner!om saion4ill be!ome he mos %ra!i!al !ommuni!aions ool in he %lan.Background"he iner!om s)sem in +adeed is a h)brid o. analog and digial !ir!uis .rom 'ndusroni!and Neumann *brands,. "he) em%lo) run: e!hnolog) similar o a ele%hone s)sem,bu usesonl)one-4a)broad!as %roo!ol oransmi #oi!edaao#er adedi!aedrun:ed ne4or:. ;nli:e he ele%hone 4here !on#ersaion o%eraes boh 4a)s 4ihin aA, he (enral=/!hange %ro!esses he re0uess b) sending i hrough he 5adio ;ni .or (S->. "hus,in a radiional iner!om-o-iner!om seu%, he 5adio ;ni re%la!es he iner!om saion."he5adio;ni rans.ormshedigial signal !oming.romhe(enral =/!hangeinoanalogradio4a#e.ormobere!ei#edb)he5adio;ni o. he!orres%onding!ranesaion.9igure 1 Basi! O%eraion o. a (rane 5adio 'ner!om SaionNoe ha he re!ei#e .re0uen!) .or he !rane saions are %rimaril) se o 112 M+2. Buin order .or he s)sem o disinguish 4hi!h radio saion !an re!ei#e, i uses side band.re0uen!)inhe-ilo+er2range. "hus, .rom9igure1, 5adio;ni .or (S->musransmi he #oi!e daa a 112.026 M+2 *112 M+2 B 26 -+2,.All he #oi!e daa ransmied b) all he radio unis a he !enral e/!hange is se .or asingle .re0uen!) *su!h as 112 M+2 in 9igure 1,. "hus, b) he use o. a handheld re!ei#er*4al:ie-al:ie,, all he #oi!e daa !an be iner!e%ed a his .re0uen!). Sin!e hand-heldde#i!es *or an) oher radio re!ei#ers, !an be !on.igured o o%erae a a !hannel in heM+2 range 4ihou !onsidering he sidebands 4hi!h is in -+2 range, i is %ossible ohear all hee/!hangeo. !ommuni!aions.romall !raneandgroundsaionsa he 112 M+25adio ;ni9or (S-'5adio ;ni9or (S-(5adio ;ni9or (S-)Use of WiFi-Based Intercom Devices to Eliminate Radio Lease Cost and Interference IssuesOsabel, Ganem, !araan, "omali # $elecom, B%, $"D-%"D # &'DEED $ecnical Innovation Wee( )*+,same. And a similarl), he handheld radio !an ransmi he same message o all !ranesha are 4ihin radio range.*roblem co+eLease Cost of Radio Frequency Usage'n SaudiArabia, e0ui%men o%eraingin radio .re0uen!) be4een 106 o 623 M+2 isusuall) allo!aed .or mariime mobile !ommuni!aions .or na#igaion *('"(, 2003,. "hus,heusageo. his.re0uen!)!hannel re0uireshesringen a%%ro#al .romheSaudigo#ernmen hrough he (ommuni!aion and 'n.ormaion "e!hnolog) (ommission*('"(, o a!0uire a li!ense. And in +adeed, here are a oal o. 13 li!ensed !hannels4ih a lease !os o. SA5 630,000 %er )ear *'S$, 2010,. A single !hannel !orres%onds oa main !arrier .re0uen!) in he M+2 range and anoher sideband .re0uen!) in he -+2range 4hi!h is used o disinguish he ideni) .or ea!h !rane. "hese .re0uen!) !hannelsareusedb)hehandheldradios.rom'S$."able1sho4she13li!ensed!hannelsallo!aed.or +adeed. "hus, 4e!anassumeha .or ea!h.re0uen!)!hannel, SA536,000 ma) be s%en annuall).SN "ransmi 9re0uen!), M+2 5e!ei#e 9re0uen!), M+201 122.0260 112.026002 122.0600 112.060003 122.DE60 112.0DE601 122.D600 112.D60006 12E.1126 11E.112603 12E.13E6 11E.13E60E 12E.1E60 11E.1E600D 12E.3E60 11E.3E60"able 1 Li!ensed 9re0uen!) (hannels allo!aed .or 'S$ 5adiosUnlicensed Radio Channels"here are 37 !ranes in +adeed ha use he mariime .re0uen!) 4ihou li!enses. "he)o.enhadiner.eren!e4ihoherorgani2aionso%erainginhesame.re0uen!).Busin!ehesignal srengh*dB, in+adeed!ranesareaenuaed*or redu!ed, he)usuall) do no disurb heoher organi2aions. +o4e#er, hose organi2aionsha are