History• first Proposed by NTT DoCoMo in 2004• first publicly launched by TeliaSorena in 2009
Features• IP-based network• peak data transfer rate - downlink 300 Mbps and uplink 75 Mbps• transfer latency less than 5 ms• ability to manage fast-moving mobiles• supports multi-cast and broadcast streams• provide up to 20MHz of spectrum• seamless handover with older network technology (GSM, UMTS, CDMA2000)
Voice calls• LTE support only packet switching• Voice calls in GSM, UMTS and CDMA2000 are circuit switched
• How can we use regular voice call or SMS on LTE?• How can we refer to handset number on IP-based network?• How can we handle to continue voice call on 2G/3G when the LTE network disappear?
Solution (in development)• VoLTE – Voice over LTE • based on IMS (IP Multimedia Subsystem) • similar to VoIP• CSFB – Circuit Switched Fallback • LTE provides only data services • fallback to circuit switched when do voice call• SVLTE – Simultaneous Voice and LTE • handset works simultaneously on both LTE and CS • based on handset - no special requirements on the network
Handsets• limited number of handset models are supported• every LTE handsets still very expensive
LTE Advanced• scalable system bandwidth up to 100 MHz• support relay node base stations• up to 3.3Gbps peak download rates (with aggregated 100 MHz bandwidth)• Yota is the first carrier to provide commercial LTE Advanced • launched on October 2012 • but no compatible handset available until 2013