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September 2007Tng quan h thng thng tin di ng

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Tng quan h thng thng tin di ng Tng quan v h thng thng tin di ngLch s pht trinXu hng pht trin Cu trc chung ca h thng TTDM hnh tham kho ca h thng TTDCu trc a l ca h thng TTD c tnh c bn ca h thng TTD

Lch s pht trin First Generation 1G.L h thng TTD tng t s dng phng thc a truy nhp FDMA v iu ch tn s FM. 1G c c im sau:Phng thc a truy nhp FDMADch v n thun l thoiCht lng thpBo mt kmTng quan h thng thng tin di ng

Lch s pht trin Mt s h thng 1G in hnhNMT (Normadic Mobile Telephone) s dng bng tn 450 MHz. Trin khai ti Bc u vo nm 1982.TACS (Total Access Comm. System) trin khai ti Anh nm 1985AMPS (Advanced Mobile Phone System) trin khai ti Bc M nm 1978, s dng bng tn 800MHzTng quan h thng thng tin di ng

Lch s pht trin Second Generation - 2G.H thng di ng s t bo2G c c im sau:Phng thc a truy nhp TDMA, CDMA bng hpChuyn mch knh (Circuit Switching)Dung lng tng, cht lng thoi tt hn, h tr cc dch v s liu (data)Tng quan h thng thng tin di ng

Lch s pht trin Mt s h thng 2G in hnh GSM (Global System for Mobile Phone) TDMA, trin khai ti chu uD-AMPS (IS-136:Digital Advanced Mobile Phone System) TDMA,trin khai ti M IS-95 (CDMAone) CDMA, trin khai ti M v Hn Quc PDC (Personal Digital Cellular) TDMA, trin khai ti Nht BnTng quan h thng thng tin di ng

Lch s pht trin Evoved Second Generation 2.5G2.5G c c im sau:Cc dch v s liu ci tin: Tc bit cao hn. H tr kt ni Internet Phng thc chuyn mch gi.GPRS: General Packet Radio Services (nng cp t GSM, h tr tc 172Kbps) EDGE: Enhance Data Rate for GSM Evolution 384KbpsTng quan h thng thng tin di ng

Lch s pht trin Third Generation 3GH tr cc dch v s liu tc cao: Di chuyn trn cc phng tin (Vehicle) 144Kbps Macro cell i b, di chuyn chm (Pedestrians) 384Kbps Micro cell Vn phng (Indoor, stationary users) 2Mbps pico cellCc dch v a phng tin, kt ni qua Internet: video streaming-conreference Tng quan h thng thng tin di ng

Lch s pht trin Third Generation 3G (tt)Hai hng chun cho mng 3GW-CDMA: UMTS Pht trin t h thng GSM, GPRSCDMA 2000 1x EVDOPht trin t h thng CDMA IS-95 Tng quan h thng thng tin di ng

Lch s pht trin Fourth Generation 4GHai hng chun cho mng 3GCi tin v dch v d liu Tc : 20 100MbpsPhng thc iu ch OFDM , MC-CDMA Xu hng kt hp mng li IP + mng truy nhp di ng 3G v truy nhp v tuyn WiMAX v WiFiTng quan h thng thng tin di ng

Xu hng pht trin ca HT TTDTng quan h thng thng tin di ng

Mt s tnh nng t c GSM Cc dch v mng mi v ci thin dch v lin quan n truyn s liu:nn s liu ngi dng, s liu chuyn mch knh tc cao (HSCSD), GPRS v s liu 14,4Kbps. Cc tnh nng lin quan n dch v ting nh: codec ting ton tc tng cng (Enhanced full rate codec). Cc dch v b sung nh: chuyn hng cuc gi, hin tn ch gi, chuyn giao cuc gi v cc dch v cm gi mi Tng quan h thng thng tin di ng

Mt s tnh nng t c GSM (tt) Ci thin lin quan n dch v SMS, mc ni cc SMS, m rng bng ch ci, m rng tng tc gia cc SMS. Tnh cc. Tng cng cng ngh SIM Dch v mng thng minh nh CAMEL. Cc ci thin chung: chuyn mng GSM AMPS, cc dch v nh v, tng tc vi cc h thng thng tin di ng v tinh v h tr nh tuyn ti u.Tng quan h thng thng tin di ng

Yu cu i vi mng 3G L bng rng v c kh nng truyn thng a phng tin, tc l tc d liu ngi s dng c th ln n 2Mbps. C kh nng cung cp rng bng tn theo yu cu. Ngoi ra phi m bo ng truyn khng i xng. Cung cp thi gian truyn dn theo yu cu, tc l m bo kt ni chuyn mch cho ting, video v kh nng s liu gi cho cc dch v s liu. Tng quan h thng thng tin di ng

Yu cu i vi mng 3G (tt) Cht lng dch v khng thua km cht lng dch v mng c nh, nht l i vi ting. C kh nng s dng ton cu, tc l bao gm c thng tin v tinh.

Tng quan h thng thng tin di ng

Ph tn s trong HT TTDTng quan h thng thng tin di ng

Cu trc chung ca h thng TTDTng quan h thng thng tin di ng

Cu trc a l ca h thng TTDDo tnh cht ca thu bao di ng nn mng di ng phi c t chc theo mt cu trc a l nht nh sao cho c th theo di c v tr ca thu bao.Phn chia theo vng mng. Phn chia theo vng phc v MSC/VLR. Phn chia theo vng nh v. Phn chia theo .Tng quan h thng thng tin di ng

Phn chia theo vng mngTrong mt quc gia c th c nhiu vng mng vin thng. Cc vng mng di ng c i din bng mt tng i cng GMSC.Tt c cc cuc gi n mt mng di ng t mt mng di ng khc u c nh tuyn n GMSC.Tng i ny lm vic nh mt tng i trung k vo cho mng GSM/PLMN. y l ni thc hin chc nng hi nh tuyn cuc gi kt cui trm di ngTng quan h thng thng tin di ng

Phn chia theo vng mng (tt)Tng quan h thng thng tin di ng

Phn chia theo vng phc v MSC/VLRMt mng thng tin di ng c phn chia thnh nhiu vng nh hn, mi vng nh ny c phc v bi mt MSC/VLR. Tng quan h thng thng tin di ng

Phn chia theo vng nh vMi vng phc v MSC/VLR c chia thnh mt s vng nh v LA (Location Area). LA l mt phn ca vng phc v MSC/VLR m MS c th chuyn ng t do v khng cn cp nht thng tin v v tr cho MSC/VLR qun l v tr ny. H thng c th nhn dng LA da vo nhn dng vng nh v LAI (Location Area Identity). LA c th c nhiu v thuc mt hay nhiu BSC, nhng ch thuc mt MSC. Tng quan h thng thng tin di ng

Phn chia theo vng nh v (tt)Tng quan h thng thng tin di ng

Phn chia theo Vng nh v c chia thnh nhiu (cell). l mt vng ph v tuyn c mng nhn dng bng nhn dng ton cu CGI (Cell Global Identity). MS nhn dng bng m nhn dng trm gc BSIC (Base Station Identity Code). Vng ph ca cc thng c m phng bng hnh lc gic tin cho vic tnh ton thit k.Tng quan h thng thng tin di ng

Phn chia theo (tt)Tng quan h thng thng tin di ng

c tnh c bn ca h thng TTDNgoi nhim v cung cp dch v in thoi c nh, mng TTD phi c cc dch v c th m bo thng tin mi ni, mi lc S dng hiu qu bng tn t c dung lng cao m bo cht lng truyn dn yu cu. Cho php pht trin cc dch v mi, nht l cc dch v phi thoi. m bo an ton thng tin tt nht.Tng quan h thng thng tin di ng

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