The Handover is the process of transferring an ongoing call or data session from
one cell connected to the core network to another 
  • It is transparent for the end user 
  • It is network controlled and UE assisted 
  • The 3GPP defines handover: 
  • Intra e-UTRAN 
  • Inter RAT with 3GPP technologies (GSM, WCDMA) 
  • Inter RAT with non-3GPP technologies (CDMA2000, HRPD)