现代无线和移动通信系统七章节

1、无线接入与未来移动通信的发展广播层（DVB/DAB）用于宽带下行链路（含卫星/HAPS）2G/2.5G/3G/beyond 3G蜂窝（全移动性）蜂窝层WLAN（HyperLAN2）（有限移动性）热点层WLAN短程连接（局部移动性）PAN/VAN/HAN层xDSL/电缆MODEM（无移动性）有线层图1、通用无线电环境的网络分层结构未来无线与移动通信的分层结构未来无线与移动通信的分层结构无线接入的类型 以宽带无线IP接入为特征的无线城域网(WMAN) 、无线局域网（WLAN） 、无线个域网（WPAN）发展迅速0 0500500100010001500150020002000250025001999

2、199920002000200120012002200220032003万万年年数据来源：Frost & Sullivan 国外WLAN用户增长趋势图WLANWLAN技术与技术与IEEE802.11IEEE802.11协议协议IEEE.802.11(b)IEEE.802.11(a) HiperLANWMAN无线接入的发展趋势宽带IP无线接入系统WPAN与蓝牙技术(Bluetooth) 移动通信的发展与展望 电子科技大学 李少谦Cellular accessBluetooth within PANPANPAN Personal Area NetworkComplementing Tech

3、nologies平流层通信系统 移动通信的发展与展望 电子科技大学 李少谦denotes interconnection between systems via networks or the like , which allows flexible use in any environments without making users aware of c onstituent systems.移动性移动性yMediumBS digital BroadcastingTerrestrial digital broadcasting传输速率传输速率(Mbit /s)1Nomadic / Loc

4、al areawireless accessLowIMT-200010100EnhancedIMT-2000Systems beyond IMT-2000EnhancementNew Elementsof Systems BeyondMobile AccessHigh未来移动通信发展趋势Source: ITU-R WP8F 7th Meeting, Queenstown, February 27 March 5, 2002, TEMP 251r1eIMT-2000WLANtypeCellular2ndgen.Short RangeConnectivityWirelinexDSLotherent

5、itiesDigitalBroadcastreturn channele.g. cellulardownload channelNew RadioInterfaceIMT-2000WLANtypeCellular2ndgen.Short RangeConnectivityWirelinexDSLotherentitiesDigitalBroadcastreturn channele.g. cellulardownload channelNew RadioInterfaceIP based Core Network Services andapplications未来移动通信的发展和选择有发展潜力的五项项技术有发展潜力的五项项技术3G存在的问题Beyond 3G/4G的研究正在兴起Beyond 3G/4G的研究正在兴起Evolution beyond 3GEDGEcdmaOneGSMTDMA Always Best Connected (ABC) 2G 64 kbpsFirst step into 3G64144 kbps 3G phase 1384 kbps - 2 Mbpsevolved 3G384 kbps - 20 MbpsFlexible Spectrum UsageVirtual Reality (3D)4G Research20 -100 Mb