[信息與通信]cdma20001x基礎(chǔ)知識(shí)-文庫(kù)吧資料
2025-01-10 12:18本頁(yè)面
【正文】 PC subchannel 80 Reverse Link Frame =20ms=16PCGs 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 PCG PC subchannel Reverse Pilot CH Structure of Pilot Symbols and Power Control Bits 81 ? + + PNQ PN I + + PN I PN Q Walsh CodesVariable Length ? RDCCH A RPICH X C Relative Gain RSCH2 Relative Gain X B I data Q data X Sin (2?ft + ?) BBF Cos(2?ft + ?) BBF X Walsh CodesVariable Length ? ? Relative Gain X C RFCH Relative Gain X C RSCH1 ? REACH RCCCH 82 CDMA2022 1x 原理 增強(qiáng)型軟切換 83 Cell A Cell B Soft Handoff Signal Strength A B T1 T2 M1 M2 84 CDMA2022 1x 原理 CDMA2022 OSI結(jié)構(gòu) 85 Signaling Services IP PPP TCP UDP Packet Data Application High Speed Circuit Network Layer Services Voice Services Circuit Data Application MAC LAC LAC Protocol Null LAC Multiplexing MAC Control State Best Effort Delivery RLP QoS Control Physical Layer Link Layer (OSI 2) Upper Layers (OSI 37) Physical Layer (OSI 1) Unique to cdma2022 86 LAC function Length and CRC Fields Encapsulated LACPDU LACPDU Fragments SAR SAR SAR 9 10 8 Fields LACPDU (Nonencapsulated) SubLayers Illustration Message type Fields Utility 5 ARQ Fields ARQ 3 Addressing Fields Addressing 4 Authentication Fields Authentication 2 SDU BODY Fields + MCSB Layer 3 SDU 1 Pilot Measurement Report Fields Utility 6 LACPDU Padding Fields Utility 7 87 CDMA Technology Evolution IS95A IS95B cdma2022 1X Voice Cap=15..5E/sector 100% 8k voice Avg sect throughput=75 Kbps Peak Data Rate= Kbps Voice Cap=100% 8k EVRC voice Avg sect throughput=75 Kbps Peak Data Rate=64 Kbps 1xEVDO 1xEVDV Voice Cap=100% 8k EVRC voice Avg sect throughput=340 Kbps w/TD Peak Data Rate=614 Kbps No Voice Avg sect throughput=620 Kbps Peak Data Rate= Mbps Voice Cap=100% 8k EVRC voice Avg sect throughput= Mbps w/TD Peak Data Rate=5 Mbps 1995 1999 2022 2022 2022 2022 88 cdma2022 1X 網(wǎng)絡(luò)結(jié)構(gòu) 89 AAA PDSN 1X BTS 1X BTS To PSTN HA MSC/HLR To Packet Data Network CBSC/AN Circuit Link Packet Link cdma2022 1X系統(tǒng)功能框圖 IP 90 cost savings % of system using 1X ? 中低速數(shù)據(jù)的部署 : ? 低話務(wù)區(qū) (郊縣 /農(nóng)村 ) ?中低速數(shù)據(jù)的要求 ( 64kbps) 優(yōu)勢(shì) : ? 在低話務(wù)區(qū)經(jīng)濟(jì)地支持分組數(shù)據(jù) ? 提高業(yè)務(wù)質(zhì)量 ? 全面支持分組數(shù)據(jù) IS95A/B cdma2022 ?Cdma2022高速數(shù)據(jù)的部署 : ?高話務(wù)區(qū) (密集城區(qū) ) ?高速數(shù)據(jù)的要求 ( – 144k – 307k bps) CDMA 95+ 和 1X 共存 91 cdma20221X 分組接入網(wǎng) 92 Home IP Network Home AAA Mobile Station Mobile Client VLR Visited AAA SS7 Network Access Network PCF RP Interface FA HLR Home Access Provider Network PDSN IP Network Home ISP Private Network Visited Provider Home Provider HA RP interface A10/A11 MIP/GRE cdma2022 1x的數(shù)據(jù)網(wǎng)絡(luò)結(jié)構(gòu) 93 Packet Data Serving Node (PDSN): ? 橋接無(wú)線接入網(wǎng)（ Radio Access Network） 和公眾數(shù)據(jù)網(wǎng)（ Packet Data Network） ? 終結(jié) PPP會(huì)話 ? 協(xié)助分組數(shù)據(jù)計(jì)費(fèi) ? FA功能，支持移動(dòng) IP 94 Authentication, Authorization, Accounting Server (AAA) ? 鑒權(quán) Authentication of profile information ? 授權(quán) Authorization of data services ? 計(jì)費(fèi) Collects billing information from PDSN 95 Home Agent (HA) ? 維護(hù)用戶登錄信息，重定向分組包到 PDSN ? 利用 AAA執(zhí)行鑒權(quán)和認(rèn)證 ? 作為可選功能 , 將數(shù) 據(jù)包通過(guò)安全隧道 轉(zhuǎn)發(fā) 到 PDSN 96 Thank You! 。 Definitions ? Chip ? A chip is a data bit at the final spreading rate ? SR Spreading Rate ? Defines the final spreading rate in terms of Mcps. So a Mcps system is called a SR3 system. ? RC Radio Configuration ? Defines the physical channel configuration based upon a base channel data rate. ? RCs contain rates derived from their base rate. For example, RC3 is based on kbps and includes , , , , , , , , and kbps. ? RCs are coupled to specific Spreading Rates 64 cdma2022 SR1 ? Is an Improved TIA/EIA95B Narrowband System ? Occupies the Same MHz Bandwidth as TIA/EIA95B – Forward Link: ? Adds Fast Power Control ? Uses QPSK Modulation Rather than Dual BPSK to: – Use 3/8 Rate Convolutional Encoder instead of 3/4 for Ser
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