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Dual connectivity related specs in LTE?

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While digging into 5G NR dual connectivity, ( and as you are aware that it is based on LTE dual connectivity). I want to learn a bit about how LTE put the foundation for this feature to come towards 5g.

I want to read the LTE architecture specs related to dual connectivity.
I donot have much RAN background in LTE. Could somebody from this background give me some quick hints, to look into which 3gpp TS or TR to understand some basics.

Btw there is 3GPP TS 36.401 doesnot have much info it looks like.

posted Aug 31, 2018 by Pdk

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I did not get the chance to work on dual connectivity but have some theoretical knowledge on it. You can refer 3GPP 36.842 to get some initial heads up.

answer Sep 1, 2018 by Harshita
Thanks a lot Harshita
Harshita,
Do you know the architecture (Alternative 3C or alternative 3D) in 36.842 in table Table 8.1.1.10-1 v12.0.0 . Does this map to   3GPP TS 36.401 Non standalone architectures.

thanks,
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+1 vote

I guess the EN-DC Dual connectivity concept comes LTE Advanced. But since I am not aware of radio side of LTE, I have a basic question regarding the uplink path.

Lets consider the MN terminated split bearer, I understand that the downlink PDCP data gets split into MeNB and SeNB. But whatabout the uplink from UE, will it come in both ways, from MeNB and SeNB and gets combined at PDCP in MeNB ? Not gone in detail in spec. Could some LTE or 5G RAN people help me with this information..

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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.

+1 vote

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Bearer split works if same SGW serving MeNB and SeNB. But if two different SGW is serving then is it possible to have bearer split?

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