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What is purpose of having feedback at Xn(user plane) during Dual Connectivity(SeNB -> MeNB)

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In Release14/15 for to support Dual Connectivity Xn user plane interface was introduced.
which is similar to S5(PGW <=> SGW)/S1(eNB <=> SGW) interface means GTP-u over UDP.

In 36.425 Xn has status report which lost packet range with start and last packet. What is the significance of having those in status report?

Does MeNB Xn has to re-transmit lost packets over Xu?
Or Also in Xn status report we have "Highest successful delivered PDCP seqence number", how SeNB Xn will get the PDCP sequence number while sending the status report?

If SeNB Xn has to send feedback report at interval it has to send?

Could anyone please clarify the above queries.

posted Aug 2, 2018 by Manohar Venkat.ch

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