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【文章內(nèi)容簡介】 t to GMSK (Gaussian Filter Minimum Shift Keying) ? 8PSK: use 8 phrases to carry signals – Different ways of encoding ? nine MCS(Module Coding Schemes) have been defined, from per timeslot(MCS1 with GMSK modulation) up to per timeslot(MCS9 with 8PSK modulation) – High radio interface data rates (up to 384kbps) EDGE Features EDGE Features cont. ? Provides an evolutionary migration path from GPRS to UMTS – Only one EDGE transceiver unit need to be added to each cell. – Software upgrades to BSC and Base Stations can be carried out remotely. – Higher layer protocols (GGSN, SGSN) stay the same – Can be introduced smoothly in GPRS(doesn’t require any new elements) EDGE Features cont. ? EDGE is a technology both for – HSCSD(High Speed Circuit Switched Data) is simply a Circuit Switched Data call in which a single user can take over up to four separate channels at the same time. – and for GPRS(General Packet Radio Service) to meet the demands of wireless multimedia applications. – Also introduced into existing IS136 works EDGE Features cont. ? The Data working for WCDMA will likely be based on EDGE/GPRS infrastructure protocols, Such as GTP(GPRS Tunneling Protocol) ? As a consequence EDGE is a way to provide 3G services on 2G works Scenario for Migration from 2G to 3G What are 3G Technologies? ? UMTS (Universal Mobile Telemunications Service) – EDGE can coexist with UMTS ? . Edge provide high speed services for widearea coverage while UMTS is deployed in urban hot spots. ? Cdma 2020 – based on the cdma One standard, two air modes: ? one based on the parallel use of 3 contiguous cdmaOne carriers (multicarrier approach), ? the other one on the use of the corresponding 3 carriers width spreading (direct spread approach) What are 3G Technologies? Cont. ? UWC136 (USA cellular standard) – based on GPRS and EDGE technologies defined by ETSI for data on overlay of ANSI136 classical works for voice. Nevertheless, UWC136 can benefit from the expected standardization of voice over IP (VoIP) on EDGE. DAMPS operators mainly promote UWC136. To be Continued ? Mr. HongYi Wu will give us More detail about these topics What does UMTS provide? ? Circuit and PacketOriented Services ? Seamless Global Roaming ? Capacity and Capability to serve more than 50% population ? A Wide Range of Services – Voice, lowrate data and highrate data – 144kb/s, 384kb/s , 2Mb/s UMTS coverage vs. bit rate Outdoors Vehicle Walk Fixed Indoors 155Mb/s GSM UMTS Broadband Radio UMTS Hierarchical Cell Structure Satellite MegaCell Satellite MegaCell MacroCell MacroCell MicroCell PicoCell Mi
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