Sustavi za vođenje i praćenje proces Franjo Pongrac CDMA 2000 Sustavi za vođenje i praćenje proces Franjo Pongrac

Što je CDMA? Standard za 3G mreže koji uveo veće brzine prijenosa podataka ... Baziran na CdmaOne (2G) Code Division Multiple Acces

Otkuda CDMA? 1999 godine ITU (International Telecommunication Union) je odobrila 5 radio pristupa (interface) za IMT -2000 standarde Do kraja 2005 bilo je približno 170 comercijalnih CDMA i WCDMA sustava te oko 250 milijuna korisnika diljem svijeta

Kako radi CDMA? Svakom korisniku dodijeljen jedinstveni kod Svaki korisnik u prostoru šalje svoju informaciju sa jedinstvenim kodom Svi korisnici odašilju istovremeno podatke u istom frekvencijskom području!!! Kodovi odabrani tako da čine 128 vektorsku ortogonalnu bazu – SPREAD SPECTRUM

Sistem ćelija 7 ćelija = 1 Cluster (ćelije upravljane BSCom) Svi BSCovi čine PLMN i upravljani su sa MSCom U čitavoj ćeliji isti frekvenciski pojas!!!! Ostaje više prostora za bolju kvalitetu govora

Razvoj CDMA CdmaOne (2G) CDMA2000 1xRTT (1 times Radio Transmission Technology) 144kbps CDMA2000 1xEV-DO (1x Evolution-Data Optimized, originalno 1x Evolution-Data Only) CDMA2000 1xEV-DV (1x Evolution-Data/Voice) CDMA 2000 3x

Razvoj mobilnih mreža od početaka do danas

Tipična 2G Arhitektura PLMN PSTN PSDN BTS — Base Transceiver Station BSC MSC/VLR HLR GMSC CO PSTN PLMN Tandem SMS-SC PSDN BTS — Base Transceiver Station BSC — Base Station Controller MSC — Mobile Switching Center VLR — Visitor Location Register HLR — Home Location Register

2G cdmaOne (IS-95 + IS-41) BTS — Base Transceiver Station BSC — Base Station Controller MS — Mobile Station MSC — Mobile Switching Center HLR — Home Location Registry SMS-SC — Short Message Service — Serving Center STM — Synchronous Transfer Mode IS-95 MS Proprietary Interface BTS BSC A Ref (A1, A2, A5) STM over T1/T3 Ater Ref (A3, A7) STM over T1/T3 or AAL1 over SONET IS-95 MS A Ref (A1, A2, A5) STM over T1/T3 Proprietary Interface BTS BSC A1 — Signaling interface for call control and mobility Management between MSC and BSC A2 — 64 kbps bearer interface for PCM voice A5 — Full duplex bearer interface byte stream (SMS ?) A3 — Signaling interface for inter-BSC mobile handoff A7 — Bearer interface for inter-BSC mobile handoff

CDMA2000 1x Network MS BTS — Base Transceiver Station A Ref (A1, A2, A5) STM over T1/T3 STM over T1/T3 or AAL1 over SONET BSC Proprietary Interface BTS IS-2000 MS AQuarter Ref (A10, A11) IP over Ethernet/AAL5 RADIUS over UDP/IP BTS — Base Transceiver Station BSC — Base Station Controller MS — Mobile Station MSC — Mobile Switching Center HLR — Home Location Registry SMS-SC — Short Message Service — Serving Center STM — Synchronous Transfer Mode PDSN — Packet Data Serving Node AAA — Authentication, Authorization, and Accounting Home Agent — Mobile IP Home Agent A10 — Bearer interface between BSC (PCF) and PDSN for packet data A11 — Signaling interface between BSC (PCF) and PDSN for packet data

1xEVDO — IP Data Only RADIUS over UDP/IP IS-2000

1XEVDV — IP Data and Voice SIP SS7 SCTP/IP H.248 (Maybe MGCP) Circuit switched voice IS-2000 SIP Proxy — Session Initiation Protocol Proxy Server MGCF — Media Gateway Control Function SGW — Signaling Gateway (SS7) MGW — Media Gateway (Voice) Nextgen MSC ? Packet switched voice

Zašto CDMA? Povećani kapaciteti govora Veći i brži prijenos podataka Multicast servisi Fleksibilnost frekvencijskog spektra Dulje trajanje baterije Sinkronizacija Kontroliranje potrošnje Govorni i podatkovni kanali Dodatni kanali Potpuna kompatibilnost sa starijim sustavima Podrška za servise za višestrukim platformama...

Za one koji žele znati više  http://www.geocities.com/rahulscdmapage/ Technical/CDMAPrimer.pdf http://www.tiaonline.org/standards/technology/ cdma2000/cdma2000table.cfm

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