Hi All.
In 5G, can traffic between two UEs be switched within a UPF?
I think yes with an MEC co-located.
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The answer is technically possible. In case1 same UPF can do it. In case#2 it is not possible.
As mentioned above the MEC use cases where the application is aware that these traffic should be handled within.
Lets take a moment to see what it takes to achieve this.
A UPF need to check each packet and need to check if this needs to be internally routed. Which is lot of work and can kill performance.
In MEC use cases there are lots of options where filters can be managed at edge itself. This can also be achieved from ULCL UPF as well, which means starting from SMF session management these policies are pushed into. Please note in case of ULCL we are actually putting new UPF node in data path.