移动互联网导论(第3版)课件教学内容1-1G-5G

1、Evolution of Mobile Telecom. Networks移动通信网络演进概述1Principles of Wireless Communications and Mobile NetworksLecture 1Introduction2Who? Martin CooperWhat? “大哥大”Introduction3Do you know the mobile telecommunication network?How did it start?How did it get here?1G：From 0 to 14Design philosophy of 1GIdea 1：

2、Cellularization (蜂窝小区)Full coverage of two-way communication1G：From 0 to 15Design philosophy of 1GIdea 2：Frequency reuse (频率复用) Different frequency bands in neighboring cells Same frequency band in distant cells1G：From 0 to 16FrequencyTime4 usersWhy frequency reuse?Enhance capacity under limited fre

3、quency resourceWithin a cell: Band into multiple sub-bands, allow concurrent commu. Among cells: Different bands in adjacent cells, avoid interference.FDMA: Frequency Division Multiple Access 频分多址1G：From 0 to 1How to implement frequency reuse in practice?Approach: Network planning, assign band in ea

4、ch cell.Method: Allocate frequency resources to a cluster, replicate.81G：From 0 to 181001 channels TimeFrequencyChannelsIs frequency reuse really useful？1G：From 0 to 19If N = 7,50 times of replication,C = 1001 x 50;If N = 4,88 times of replication,C = 1001 x 88.Is frequency reuse really useful？1G：Fr

5、om 0 to 110Design philosophy of 1GIdea 1：Cellularization for coverage (蜂窝小区)Idea 2：Frequency reuse for capacity (频率复用)Idea 3：Core networks for seamless handover (核心网)Radio access networkCore NetworkTelephone networkWhat if crossing different cells in communication?Answered：11Do you know the mobile t

6、elecommunication network?How did it start?How did it get here?Evolution Path：1G to 4G12Connect to the InternetRAN：More users for better broadband servicesCore：Bridge RAN and Internet Radio access networkCore NetworkTelephonenetworkInternetEvolution：2G-4G132G: Global System for Mobile Communication (

7、GSM)BSCBTSMSCPublic telephonenetworkGateway MSCGSM not connected to the InternetRANCore NetworkTelephone networkMobile subscribersBase transceiver station (BTS)Base station controller (BSC)Mobile Switching Center (MSC)GSM is a digital system2G: GSMEvolution：2G-4G142.5G: General Packet Radio Service

8、(GPRS)BSCBTSMSCPublic telephonenetworkGateway MSCGPRS is connected to the InternetRANCore NetworksTelephone networkInternetMobile subscribersGGSNSGSNInternetServing GPRS Support NodeGateway GPRS Support NodeCircuit SwitchingPacket Switching2.5G: GPRSEvolution：2G-4G15Wireless access technique in RAN

9、of 2G and 2.5GFurther enhance capacityFDMA (频分多址) FDMA (频分多址) + TDMA (时分多址)RANCore NetworksTelephone NetworkInternetInternetPublic telephonenetworkCircuit SwitchingPacket SwitchingBandTime slotRAN Tech. in 2G, 2.5GEvolution：2G-4G163G: UMTS (Universal Mobile Telecommunications Sys.)UMTS speeds up dat

10、a rateFDMA (频分多址) + TDMA(时分多址) CDMA (码分多址)RANCore NetworksTelephoneNetworkInternetInternetPublic telephonenetworkCircuit SwitchingPacket SwitchingBandTime slot3G: UMTS174G: LTE (Long-term evolution)Higher capacity, higher data rate, all-over-IP coreCDMA (码分多址) OFDMA (正交频分多址)Circuit and packet switch

11、ing All-over-IPRANCore NetworkTelephone NetworkInternetInternetPublic telephonenetworkCircuit SwitchingPacket SwitchingBandTime slotIP Multimedia SubsystemOFDMABandTime slotFrequency Division+Time DivisionIMS4G: LTEEvolution：2G-4G19Evolution：1G 4G1G2G3G4GAMPS, NMT, TACSD-AMPS, GSM/GPRS, cdmaOneCDMA2

12、000/EV-DO, WCDMA/HSPA+, TD-SCDMALTE, LTE AdvancedN/A0.5Mbps63+Mbps Mbps300+ MbpsAnalog voiceDigital, simple dataMBBBetter, faster MBB11G:模拟语音服务, 无缝移动连接33G:移动宽带业务（MBB）， 更快更好连通22G:数字无线技术, 提高系统容量44G:更多移动宽带容量， 新的前沿应用领域Answered：19Do you know the mobile telecommunication network?How did it start ?How did it get here?Foreseeable Future205G is comingSummary21Do you know the mobile telecommunication network?How did it start?Design philosophy of 1G: Cellularization, frequency reuse, core networkHow did it get here?Connect to the Internet: changes in RAN and core