лȫ
ле߽뼼ȫǸǵллΧƶһֵ绰лȽ˹̶绰ƶ⣬ֱƶ绰ҪƶĸӹЧϵͳԴ˷ѣЧй̶ϵͳԴлصǵѡΧƶ̶绰ץסлһ¸ォΪһƥǿ̶ҵ
ձһЩӪΪûаպPHSλһ͵ƶ绰ϵͳͷʽƶ绰ϵͳʹPHSÿ߳ɱߴ750ԪͬʱPHS˾֮Ϊûʼ˼۴սⳡҵͨгսУNTT˾PHSҵծ۶òPHSҵ
ĿǰҹлҪĻձġPHSƷҪϵͳӦUT˹˾ͨѶൺѶĿǰݡ̩ݡ㶫졢ƸݣءĴ60ʹá
ҹձӪ̷չPHSľѵڹûֳɵľԲο£PHSṹҵص㡢йɡλӪԽоͷΪҵڹйķչǰհӲձչPHSģʽˣӦҹ顢չҵĵ·йڵ绰ĸԴPHSҵ1996ຼеžֺUTStarcom˾˹˾˰PHSͳ̿ؽΪһPASϵͳຼڵƽPASĶλҪΪ̶绰IJ졣PASϺõԭеĹ̶绰ÿ߳ɱΪ150ԪҲPASPHSĸͬʱҲPASҹѸٷչʢֱԭ:ͶСЧ졢
ƶ绰ϸߵͨˣرǹнײȴ˵ƶ绰òʵ90ڱطΧ˶ӵƶͨŹߣҪͨͬڵ绰һPASֻ÷ҪõлһշѱƷѣΪһΡ77ˣɳͨ8Сʱʱ䳤800СʱҲ˵ֻҪ³һεͿˣ˵ȹܡPASֻСɵĻԽܡĻܵԽԽ˵ΪͨѵһͨŲƷϰܵ˲Ϸչͨżʵݺͱ
лľƺڣ
л̶绰Ƚ
1ʱ
ȫжٷź⣬ù̶绰»ܿյ¶Ҫ൱ʱ䣬ⲻûлṩ١ķֻⷽҪûǨҲṩܵȻֺ֮ҲٵĻָٷҪӦںܶʱ¡
2
кĵ˿ܼͻˮ·ݺύȻڼµ·ߵḶ́ЩеijЩ½С½ݣΪҪɿѡ·ѡ(ͨ) ʩѵȣ⣬¥ܵҲӦÿûԵҷøߵĵطлǸʡ籱žֵͬ־߿:ڱһܵ컹ѡ
3ص
ͳ罨ܻһЩص⡣ڹھбijĵ±ƻߡһЩϷĹң̺õĵ£Ǿͻ͵ߣۻȻΡڹڣýҲбijĵ߱ߣͨжϣΨлṩġ·͵ߵġ
4ߵҵ
Ȼ̶ӵдûÿûġǺܵ͵ģװáֱյȻڡͳƣеijУͥ绰ƽ0.04ErlռʣĿǰҹелƽ0.08Erlһ룬ͥ绰ĵҵǵŲŵĵ֮лƳȫܽ⣬лṩ˱ȹ̶绰ķԺԣҪϰܵ˼ĶȻҪܣҲȻߵûʹƵȣﵽҵĿġ
лƶ绰Ƚ
1.ɱ
ҹGSMĽͳƣڽʱÿGSMûϵͳɱԼ210ԪʱÿûϵͳɱԼ180Ԫ;ڽʱÿлϵͳɱԼ180ԪʱÿûϵͳɱԼ150Ԫӽϵͳijɱ֪лϵͳɱԶƶ绰ϵͳɱڹ̶绰ͶʣңԼٴάãˣлǷdzġ
2Ѻʹ
лûصǵѡرǵ绰˻̼֮ҵҪṩˮƽĵҵһ۵Ƕκһҵһѵܴڣһҵѵߵˮƽ߱ȻʹãͻÿûĻллIJ죬ҲҪлû:ѡص㡣
˵硡Сͨ
ȻںܶѾͨˡСͨ лPHSҵʲʺй㡢ôһֱûֹͣ
۵:
лѵлշѣСֻ 10ߣʱ䳤 800СʱŵЩڶСٳеȣƶӴȺҪϰջӭڹ̶ҵ˵лĿǰ̶Դ˶οڶ̡װ˹߽Ͷʼάãźſ졢ͨʱؽӴ绰лʹЧʣװ⣬γлҵµ㡣ȥž־ʹ˲µʱۼƷź 6š12 1ʽͨź 4000ʷ¼Ŀǰӵû 15
۵:
ձʽͨϢźͨŻӪҵɽҲǰ PHSձ˥ԭһ PHSӪ̾еûṩõķܻ PHS PHSӪԼߵ绰ľӪߣ֧á PHSҵĴֱߵ绰˾ˣʹ PHSӪ̵г㡣 PHS罨ڣձķƶ绰ͨ 200Ԫӣ PHSֻͨѽΪ 40Ԫ3ӡƶ绰ͨĿǰѽ 90Ԫӣ PHSӪҪߵ绰˾֧ãûнۿռ䣬PHSֻͨһֱŹ̶ļ۸ʹ PHSձгʧȥɽΪйձȫͬйлҵɵŲӪٽ⣬ˣûɱңʹŲ豸õáΪǰ PHSձӪ˵ PHSгչǰ;
۵:
лձѾ˥䡢̩ʧܣPHSҵڹڵijֻǵ̶ŲżƶͨгһֶΪƱԴ˷ѺͲ
Ų̨߳
ΪһȷСͨҹķߺߣָŽ跢չг淶ŲҵļлĽ뾭Ӫ淶
ϢҵļָPHSΪлϵͳIJ죬λСΧƶ߽롣Ӧ÷Χؼмʹг˿ԶԼе칫¥ȵͨŷǵδгҵķչƣֹش裬ԵҵչPHSҵʵеҵӪ֤ͬʱPHS߽ӷ豸ʵе豸֤
ϢҵҪйżŹ˾صҵҪӳԶ濼ǣȫΪأδɣý衢ӪPHSѾúڽеPHSлϵͳϹ涨Ӧõĵ䲹˾Ӫ֤ǰ£Լ辭ӪϹ涨ӦõĵΪҵͶʺ棬Ѿɵʩڲ˱ʹáźţݡ
Ӧ˵Ϣҵ֪ͨȨ˸棬ȷлƹ㡢ʹ÷Χڹ淶гʵͨҵӪ̺ҵĿչСͨлؼмǴг˿ܼ칫¥ȵطȻdzãлйкܴгռ䡣
ĵַ:http://www.cnonline.org/2001/article/124.html