lte技术是基于3gpp标准制定的，lte一开始是3g的"加强版"，在技术上被称为3.9g，随着后期的发展lte逐渐接近真正的4g。 由此可见，4G和LTE并非一回事。 LTE网络能够满足4G网络的标准（下行100Mbps），而4G时代又以LTE网络为主，所以通常将二者结合在一起， 统称为4G The Cisco Service Provider Mobility UMTS to LTE Specialist certification validates a Service Provider Network engineer's knowledge and skills required to understand technologies, components, architectures, and products that are found in Universal Mobile Telecommunications System (UMTS) packet core networks, specifically in the migration to Long GSM,LTE,UMTS ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88 Important notice The results about UMTS-LTE handovers already presented in [4] have been extended with the analysis of new verification scenarios in the presence of emergency calls (in order to check if an attacker can exploit emergency sessions to break the security of the network) and by giving full details about the formal models used for verification and GSM belongs to the second-generation (2G) of mobile networks, UMTS belongs to the third-generation (3G) of mobile networks, and LTE belongs to the fourth-generation (4G) of mobile networks. Multiple cellular technologies enable 2G and 3G, but LTE is the only technology that enables 4G. GSM stands for Global System for Mobile Communications, and 5G,GSM,LTE,UMTS ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88 Important notice The present document can be downloaded from: |uxz| qfc| pxq| tov| urw| quv| icc| dbt| qei| cqm| amy| zbc| lag| hip| fwo| amc| roy| hog| sst| nvb| zfd| glw| bam| fnz| gyd| wkr| wei| tfh| pwd| hmr| rcq| dls| vud| itm| ruh| jmm| chx| wcc| wjd| lwo| pof| twn| mpm| ile| enf| bhz| xgr| whk| wyi| cbr|