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【正文】 ice 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 MicroCell PicoCell MicroCell PicoCell MicroCell PicoCell UTRANUMTS Terrestrial Radio Access Network Core Network RNC Node B Node B RNC Node B Node B RNC Node B Node B MH lu lu lu lur lur Uu lub Frequency Allocation ? 19201980 MHz paired with 21102170 MHz ? Total 35 MHz unpaired band 1920 1980 2020 2025 C C A MSS B A’ 2110 2170 2200 MSS FDD vs. TDD ?Both FDD and TDD are available in UMTS ?TDD has been designed for use in high density areas ?The highest bearer rate: ??FDD384kb/s WCDMA ? Radio Parameters ? Performance Improvement ? Channels ? Channel Generation ? Power Control ? Handoff WCDMA Radio Parameters ? Group 200KHz bands into MHz carriers ? Chip Rate is Mchips/sec ? System Capacity of 128 channels per cell provided by 5 MHz bandwidth WCDMA Performance Improvement ? Capacity Improvement ? No Frequency Planning ? Multiple Services per Connection ? Frequency Handoff – HCS – Hot Spot HCS amp。 Wireless Networks, PrenticeHall, 1999 ? M. Gallagher, W. Webb, UMTS: The next generation of mobile radio, IEE Review. v 45 n 2 1999. p 5963 Reference ? A. Samukic, UMTS Universal Mobile Telemunications System:Development of standards for the third generation, IEEE Global Telemunications Conference amp。 increase the power transmitted by users farest to the BTS Power Control In WCDMA ? Open Loop vs. Close Loop – Open Loop Power Control Subscriber measures the DL power and adjusts its transmission power – Close Loop Power Control BS measures the UL power. MS measures the DL power and reports to the BS. BS instructs the user to raise or lower it transmission power WCDMA Soft Handoff Active set = BS1 BS1 BS2 Active set = BS1 amp。Copyright, 2020 169。 HotSpot HCSScenario f1 f1 f2 Macro Macro Micro Handoff between layers is alwayse needed f1 f1 f1 f2 HotSpot Scenario HotSpot Handoff at HotSpot is sometimes needed WCDMA Channels ? Forward WCDMA Channels – Pilot Channel – Sync Channel – Paging Cha
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