LTE/IMS Basics

LTE/IMS Basics course will make the participants familiar with the new cellular system – Long Time Evolution (LTE) / Evolved Packet System (EPS) – a descent of PS GPRS/HSPA solutions of modern GSM/UMTS networks. LTE network, on its own, does not offer any teleservices (e.g. telephony, video-telephony, messaging) towards the end subscribers, but rather concentrates on packet bearer services (i.e. transmission of IP packets with required quality of services). Teleservices are offered instead by IP Multimedia Subsystem (IMS), that is described in a second part of the training. IMS is offering its teleservices to the end subscribers via IP connectivity provided by the LTE access network. The course also includes section about Circuit Switched Fallback (CSFB) and SMSoSGs which can be used to hand over the connection during setup from LTE to CS GSM/UMTS in order to establish traditional CS call or send traditional SMS via LTE in case the IMS is not present in the network.