S hp nht gia cc ngnh cng nghip 3G l bc quan trng quyt nh gia tng s lng ngi dng v cc nh khai thc. .3.3. Tnh tng thch:Cc dch v trn IMT-2000 c kh nng tng thch vi cc h thng hin c. Chng hn, mng 2G chun GSM s tip tc tn ti mt thi gian na v kh nng tng thch vi cc h thng ny phi c m bo hiu qu v lin mch qua cc bc chuyn. 3.4. Thit k theo modul:Chin lc ca IMT-2000 l phi c kh nng m rng d dng pht trin s lng ngi dng, vng ph sng, dch v mi vi khon u t ban u thp nht.Phn loi cc dch v ca IMT-2000

KiuPhn loiDch v chi tit

Dch v di ngDch v di ng- Di ng u cui/di ng c nhn/di ng dch v

Dch v thng tin nh v- Theo di di ng/theo di di ng thng minh

Dch v vin thngDch v m thanh- Dch v m thanh cht lng cao(16 64 kbit/s)- Dch v m thanh AM (32 64 kbit/s)- Dch v truyn thanh FM (64 384kbit/s)

Dch v s liu- Dch v s liu tc trung bnh (64 144 kbit/s)- Dch v s liu tc tng i cao (144 2 Mbit/s)- Dch v s liu tc cao ( 2Mbit/s)

Dch v a phng tin- Dch v Video (384kbit/s)- Dch v hnh chuyn ng (384kbit/s - 2Mbit/s)- Dch v hnh chuyn ng thi gian thc ( 2Mbit/s)

Dch v InternetDch v Internet n gin- Dch v truy nhp Web (384kbit/s - 2Mbit/s)

Dch v Internet thi gian thc- Dch v Internet (384kbit/s - 2Mbit/s)

Dch v internet a phng tin- Dch v Website a phng tin thi gian thc ( 2Mbit/s)

4. L trnh pht trin t cc h thng th h hai n th h 3 4.1. Lch trnh nghin cu pht trin h thng thng tin di ng th h ba.Cng trnh nghin cu ca cc nc Chu u cho W-CDMA bt u t cc n CDMT (Code Division Multiple Testbed): Phng th nghim a truy nhp theo m) v FRAMES (Future Radio Multiple Access Scheme: S a truy nhp v tuyn tng lai) t u thp nin 90. Cc d n ny cng tin hnh thc nghim cc h thng W-CDMA nh gi cht lng ng truyn. Cng tc tiu chun ho chi tit c thc hin 3GPP. Lch trnh trin khai W-CDMA c cho hnh v.Mc d mng cdma One (IS-95) khng phi l cc mng u tin cung cp truy nhp s liu, nhng y l cc mng c thit k duy nht truyn s liu . Trc ht chng x l truyn dn s liu v ting theo cch rt ging nhau. kh nng truyn dn tc thay i c sn trong cdmaOne cho php quyt nh lng thng tin cn pht, v th cho php ch s dng tim nng mng theo nhu cu. V cc h thng cdmaOne s dng truyn ting ng gi trn ng trc (cc ng truyn dn t BTS n MSC), nn kh nng truyn s liu gi c sn trong thit b. Cng ngh truyn dn s liu gi ca cdmaOne s dng ngn xp giao thc s liu gi s t ong (CDPD: Cellular Digital Packet Data) ph hp vi TCP/IP. B sung truyn s liu vo mng cdma2000 s cho php nh khai thc mng tip tc s dng cc phng tin truyn dn, cc phng tin v tuyn, c s h tng v cc thit bi u cui hin c bng cch nng cp phn mm cho chc nng tng tc. Nng cp ln IS-95B cho php tng tc knh cung cp tc s liu 64 115 kbit/s v ng thi ci thin chuyn giao mm v chuyn giao cng gia cc tn s. Cc nh sn xut cng b cc kh nng s liu gi, s liu knh v fax s trn cc thit b cdmaOne ca h. Mt trong cc mc tiu quan trng ca ITU IMT 2000 l to ra cc tiu chun khuyn khch s dng mt bng tn trn ton cu nhm thc y mc cao vic nhiu ngi thit k v h tr cc dch v cao. IMT 2000 s s dng cc u cui b ti kch c nh, m rng nhiu phng tin khai thc v trin khai cu trc m cho php a ra cc cng ngh mi. Ngoi ra cc h thng 3G ha hn em li cc dch v ting v tuyn c cc mc cht lng hu tuyn ng thi vi tc v dung lng cn thit h tr a phng tin v cc ng dng tc cao. Cc dch v trn c s nh v, o hng, h tr cp bo v cc dch v tin tin khc cng s c h tr. S pht trin ca h thng 3G s m cnh ca cho mch vng thu bao v tuyn i vi PSTN v truy nhp mng s liu cng cng, ng thi m bo iu kin tin li hn cc ng dng v cc tim nng mng. N cng s m bo chuyn mng ton cu, di ng dch v, ID trn c s vng, tnh cc v truy nhp th mc ton cu. Thm ch c th hy vng cng ngh 3G cho php kt ni mng v tinh mt cch lin tc. Mt trong cc yu cu k thut ca cdma2000l tng thch vi h thng c cdmaOne v: Cc dch v ting, cc b m ho ting, cc cu trc bo hiu v kh nng bo mt.Bng cch chuyn t cng ngh giao din v tuyn IS-95CDMA hin nay sang IS-2000 1X ca tiu chun cdma2000, cc nh khai thc t c tng dung lng v tuyn gp i v c kh nng x l s liu gi n 144 kbit/s. Cng s ra i ca cdma2000 giai on mt, cc dch v s liu cng s c ci thin. Giai on 2 cng s uc hnh thnh c cu MAC (Medium Access Control: iu khin truy nhp mi trng) v nh ngha giao thc on ni v tuyn (RLP: Radio Link Prtcol) cho s liu gi h tr cc tc s liu gi t nht l 144kbit/s.Thc hin giai on 2 ca cdma2000s mang li rt nhiu cc kh nng mi v cc tng cng dch v. Giai on 2 s h tr tt c cc kch c knh (6X, 9X v 12X) c cu cho cc dch v ting, b m ho ting cho cdma2000, bao gm ting trn nn IP. Vi giai on 2 cc dch v a phng tin thc s s c cung cp v s mang li c hi thun li b sung cho cc nh khai thc. Cc dch v a phng tin s c th thc hin c thng qua MAC s liu gi, h tr y cho s liu gi, h tr y cho dch v s liu gi n 2Mb/s, RLP h tr tt c cc tc s liu n 2Mb/s v m hnh gi a phng tin tin tin.

L trnh pht trin t cdmaOne n cdma 2000

C cdma2000 giai on 1 v 2 u c th ho trn vi cdmaOne s dng hiu qu nht ph tn tu theo nhu cu ca khch hng. Chng hn mt nh khai thc c nhu cu ln v dch v s liu tc c th chn trin khai kt hp giao on 1 cdma2000 v cdmaOne vi s dng nhiu knh hn cho cdmaOne. mt th trmg khc, ngi s dng c th cha cn nhanh chng s dng cc dch v tc s liu cao th nhiu knh hn s c dnh cho cc dch v ca cdmaOne. V cc kh nng ca cdma2000 giai on hai sn sng nn nh khai thc khc c nhiu cch la chn hn trong vic s dng ph tn h tr cc dch v mi4.3. Tng kt qu trnh pht trin ca h thng thng tin di ng n th h baTrong qua trnh ny ta tng kt nn tng cng ngh chnh ca thng tin di ng t th h mt n th h ba v qu trnh pht trin ca cc nn tng ny n nn tng ca th h ba. tin ti th h ba c th th h hai phi tri qua mt giai on trung gian, giai on ny gi l th h 2,5.

Tng kt qu trnh pht trin ca cc nn tng thng tin di ng th h 1 n th h 35. Cc tiu chun cng ngh ca h thng thng tin di ng th h ba:Cc h thng thng tin di ng th hai gm: GSM, IS 136, IS 95 CDMA v PDC. Trong qa trnh thit k cc h thng thng tin di ng th h ba, cc h thng th h hai c cc c quan tiu chun ho ca tng vng xem xt a ra cc xut tng thch. Khuyn ngh ITU-R M.1457 a ra 6 tiu chun cng ngh cho giao din truy nhp v tuyn ca thnh phn mt t ca cc h thng IMT-2000 (tn gi mng 3G ca ITU), bao gm:- IMT-2000 CDMA Direct Spread (tri ph trc tip), thng c bit di tn WCDMA. - IMT-2000 CDMA Multi-Carrier (nhiu sng mang), y l phin bn 3G ca h thng IS-95 (hin nay gi l cdmaOne) - IMT-2000 CDMA TDD- IMT-2000 TDMA Single-Carrier (mt sng mang), cc h thng thuc nhm ny c pht trin t cc h thng GSM hin c ln GSM 2+ (c gi l EDGE). - IMT-2000 FDMA/TDMA (thi gian tn s), y l h thng cc thit b ko di thu bao s chu u.