A Vulnerability in the UMTS and LTE Authentication and Key Agreement Formal verification of LTE-UMTS handover procedures PDF. Add to Library.1. LTE to UMTS Figure 3 depicts the simplified message exchange flow performed during Inter- RAT handover from LTE to UMTS technologies, and represents the The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under Intra-LTE TAU and Inter-eNodeB Handover with Serving GW Relocation. Universal Mobile Telecommunications System (UMTS);. LTE; shall be the printing on ETSI printers of the PDF version kept on a specific network drive.