2019/12 26 p.
The objective of this study item is to investigate enhancements to disaggregated gNB scenario. At least the following topics should be studied:
Identifying detailed solutions for further enhancements on current flow control mechanism with the following aspects considered.
Note1: The solution was required to be backward compatible (i.e. carefully consider the fact no criticality handling defined in U-plane protocol specification).
PDCP PDUs may be delivered in the Uu interface out of sequence.
The re-transmitted PDCP PDUs may arrive at DU out of order.
In DC scenario, data transmitted to UE from two legs may arrive out of order which in turn may result in out-of-order delivery to higher layer in case of re-ordering timer expiration.
Identifying detailed solutions to support the scenario that one UE connects to several gNB-CU-UPs which belong to different security domains.
Note2: SA3 should be involved in this SI.
Note3: CP/UP separation and CU/DU split should be invisible to other nodes (especially UE should not be impacted).
full Table of Contents for TR 38.823 Word version: 16.0.0