What are the types of Handover in all mobile technologies?

What are the types of Handover in all mobile technologies?

2G

  • Hard Handover

3G

  • Soft Handover in same frequency
  • Hard Handover in special cases :
    • Inter-frequency Handover
    • IRAT Handover
    • HSDPA Handover as the data send from the best active-set cell and other active-set cells are for signaling only
    • Inter-RNC without IUR link

Hard Handover: switch between cells or frequencies
Soft Handover: in same frequency, serving from more than cell (Active-Set) (AS)
Softer Handover: special case of Soft Handover when Active-Set cells are in the same site (Node-B)

4G

  • Hard Handover
    • X2-based Handover: least complex used when an X2 interface exists between Source and Target eNB.
    • S1-based Handover: when no X2 interface available between the source eNB and the target eNB - signaling pass through the MME.

5G

  • Hard Handover
    • Network Controlled Handover
    • UE Controlled Handover