Jeffrey, As an IETFer, I like the idea you presented at IETF113 DMM session for draft-zzhang-dmm-5g-distributed-upf & draft-zzhang-dmm-mup-evolution.
Just a few questions. 3GPP Release 18 does allow the distributed UFPs, and allow UFP and gNB to be collocated. As 5G deploy large number of Cell Towers, it is possible that one UPF can handle traffic for multiple gNBs. Q1: When gNB and a UPF is collocated, what are the special features needed by draft-zzhang-dmm-5g-distributed-upf? When one UPF is shared multiple gNBs, a GTP tunnel can carry additional information for UPF to process the data inside the GTP tunnel. Once the UPF decapsulate the GTP encapsulation, the inner IP is forwarded to the N6 interface (IP). Very often the UPF use NAT so the routers on the N6 interfaces don't see the actual source IP of the UE. How is your proposed structure different from the current practice? Linda ,
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