How does network make sure that no jitter or service interrupt while executing handover procedure?

Question

In case of SGW relocation, MME sends CSRequest to new SGW, now question how does a SGW come to know that CS Request is received as part of attach procedure or handover procedure ?

Answer 1

If I understand this question properly, Intra-LTE supports two types of handover:
1. X2-based handover
2. S1-AP based handover:
In both types of handover, 0 packet loss support is present.
Source eNodeB takes care of those things, while doing handover procedure source eNodeB prepares and sends S1-AP "Handover Required" message to MME. In this message, source eNodeB may include "Direct Forwarding Path Availability" IE. If it is present then good else MME creates indirect fowarding tunnels for data forwarding. So by using either direct or indirect tunnel, 0 packet loss is achieved.