4G֪ʶ:Ӫѡ
2015-03-04 15:54йֻԭ
ŹŲйźйͨҪFDD-LTEգй4GĻڵźͨӵгйƶĸʿԴӪڴǰѾ˴4Gվ˿ڼʱȫչ4Gҵƹ㡣йƶƾTDD-LTEһҶľĹۡ
ʲô4Gأ4GָĴƶͨżеġGӢġgenerationһдȥϰϽƶ3G4Gں˸ĴƵź£Իó3G5-10ٶȡϣTDFDD4GԳ100M/sٶݡȻʵʲϿܴﵽ20Mbps-50MbpsܺĿǰйֳе߿ٶȲࡣȻڱ4GûʹšûʹûվϰȸԭߴڵȶԻȽϲڲϵĸĽ
ľһЩ4Gijʶһ½ܣ
4Gж죿
4Gٶ100Mbps150Mbpsֻݣʹ4Gվֻһûʹáñȴʹõ2.4G·150MBͨζʵʴԴﵽ150Mbpsο4GģûöƵν4Gڶû£ʻӦ˥й4GʷѺܸߣܶûʹõǼʮԪMBҲ˵ڴһӾˡʷѣվĴкܴĸģٶȲòġ
Ϊʲô4Gֻٶʱǹ
Ŀǰ4Gĸȫؼϳе츲ǣڽ¥ܼijд¥ķǿλãźŵǿȣٶһ⡣ŵ4Gźŵʱܿл2G/3GйƶTD3Gʵʴٶ1Mbps2GֻмʮKbpsԻеľ졣
źźǿ⣬Ҳв죬ǽ˵Ķ٣ЩطѧУվ軹ûиϣûضʱ㣨ҹȴģн롣ӪûвʱʩͻʹýѣѾûٶҲdz
¥ܷ4G
źźͻվйܣȸƶйءڽ¥ܿΪ̫ʹ4Gź롣Ŀǰʹ4GȻٶ죬Ǵǽ3G2G
4GֻźŸ
źǿȺ4GʵĹϵԶ2GʱȻʾźԽǿٶͨDZȽϿ죬ûбȻϵʵУʱźűźŵٶȿ죬ʱָоԭϵص´ٶֱʾ
4G뻻ԭ
ΪʲôҪأҪ4GоƬĹݵĽһUSIMĴС仯һͱ뻻
ʲô4Gأ4GָĴƶͨżеġGӢġgenerationһдȥϰϽƶ3G4Gں˸ĴƵź£Իó3G5-10ٶȡϣTDFDD4GԳ100M/sٶݡȻʵʲϿܴﵽ20Mbps-50MbpsܺĿǰйֳе߿ٶȲࡣȻڱ4GûʹšûʹûվϰȸԭߴڵȶԻȽϲڲϵĸĽ
ľһЩ4Gijʶһ½ܣ
4Gж죿
4Gٶ100Mbps150Mbpsֻݣʹ4Gվֻһûʹáñȴʹõ2.4G·150MBͨζʵʴԴﵽ150Mbpsο4GģûöƵν4Gڶû£ʻӦ˥й4GʷѺܸߣܶûʹõǼʮԪMBҲ˵ڴһӾˡʷѣվĴкܴĸģٶȲòġ
Ϊʲô4Gֻٶʱǹ
Ŀǰ4Gĸȫؼϳе츲ǣڽ¥ܼijд¥ķǿλãźŵǿȣٶһ⡣ŵ4Gźŵʱܿл2G/3GйƶTD3Gʵʴٶ1Mbps2GֻмʮKbpsԻеľ졣
źźǿ⣬Ҳв죬ǽ˵Ķ٣ЩطѧУվ軹ûиϣûضʱ㣨ҹȴģн롣ӪûвʱʩͻʹýѣѾûٶҲdz
¥ܷ4G
źźͻվйܣȸƶйءڽ¥ܿΪ̫ʹ4Gź롣Ŀǰʹ4GȻٶ죬Ǵǽ3G2G
4GֻźŸ
źǿȺ4GʵĹϵԶ2GʱȻʾźԽǿٶͨDZȽϿ죬ûбȻϵʵУʱźűźŵٶȿ죬ʱָоԭϵص´ٶֱʾ
4G뻻ԭ
ΪʲôҪأҪ4GоƬĹݵĽһUSIMĴС仯һͱ뻻
4GޱҪ
Ŀǰ3GʵٶйͨWCDMAڵCDMA͵ƶTDWCDMAѾ˵ֻٶȿԴﵽMbpsCDMAһ1Mbpsҡƶֻмbpsڸ4GϣûϣƵšƵйƶйŵ3G٣ͨʱɲֻQQţţûҪȻʿMBʮMBļʹ4GDZġ
ѡšͨFDD-LTEйƶTDD-LTE
ӲҵijȣFDDȻ죬TDDնƶ֧£۸ͨ4GѾƽȵ4G100ԪϡӼϿTDD-LTEźݵϴضͬһƵʵŵнСΪϴصݲܡ֮ʱ۸ʹԼġFDD-LTEźݵĴŵŵƵʲͬһϴݣһݡϴصݿڸԵϢͨнɴ䣬˴˵ٶҪ졣ٴηָûߵʵѾ
йƶѾ80TDD-LTEնˣԶԶԽšͨںܶũƶ4GźõġڳУͨչŲҪùͨõFDDйTDDϻվڵײ㲻£ͬʱFDDTDDƵӦãû˫4GֻԶ4GģʽʹôȶĿǰЩ۵ĶʵеͨTDD 4GûȤ϶µĺƶѣ˵ͨȻԼ˫4Gȶ˵ڳȶԳƶĵ4G˵ʵҲվסŵġ
߸ҵĽǣ4Gʱǹȥû鲻ӪΪ4GʱڳУӪ̵IJС2G/3GʱľDzͬġҪ˵㽨飬ũԶĴйƶʿرdzʹվûõ4Gһ壬ˮôͨ3G/4GϹ˽ͨ4Gڲ뻻ŵûȫͨ˫˫ֻԭӪ̿2Gֻ绰һ4G
ĵַ:http://www.cnonline.org/2015/article/12055.html