My friend: Hi Ibrahim, I have a question.
Me: Go ahead.
My friend: What is the meant by DAPS handover in 5G?
Me: DAPS (Dual Active Protocol Stack) handover is defined by 3GPP in Rel-16 to decrease mobility interruption time which is the time during which the user isn’t able to transmit or receive data while performing handover. In 4G networks, the mobility interruption time is typically around 30 – 60 ms depending on handover scenario and effective radio conditions.
My friend: But this time is already low in 4G, why is 3GPP targeting to decrease it more in 5G?
Me: Simply, because 5G use cases are different from 4G. In 5G, we’ve URLLC which requires much less mobility interruption time than 4G.
My friend: But, how did they reduce it?
Me: By using continued transmission/reception in the source cell after receiving the handover request, also using simultaneous reception of user data from source and target cells and lastly by UL transmission of user data switched to target cell at completion of random access procedure, please check the below snapshot.
My friend: Thanks a lot.
Me: You are welcome.
Source: Ibrahim Sayed
Linkedin Profile:Â https://www.linkedin.com/in/ibrahim-sayed-88a7747-5g/
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 handover is defined by 3GPP in Rel-16 to decrease mobility interruption time){kind=link}