5G SA Inter gNB Handover - Xn Handover

Mobility (Handover) in an important feature in any telecom generation and so it is in 5G. The basic handover procedure remains same as it was in legacy networks, i.e. UE reports measurement report with neighbor cell PCI and signal strength to source cell, source cell take the decision to start handover procedure to best target cell and Target Cell completes the Handover procedure.

In LTE, we use to have different types of Intra System (LTE to LTE) handover like X2 Based Handover, S1 Based Handover, Inter Frequency, Intra Frequency and Inter sector handovers, similarly 3GPP specification has defined different Intra system (5G NR to 5G NR) handovers, e.g. Xn based Handover, N2 or NGAP Based Handover, Intra and Inter Frequency Handovers.

In this post we will discuss about Inter gNB Xn Handover, When the UE moves from one gNB to another gNB without relolcating the UPF.

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