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|  Y1  |  Y2  |

 

5GS–Y1

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between  UE
and  non-3GPP access

see it   here

specified from  Rel-15  in
TS 23.501, clause 4.2.8.3 

This depends on the non-3GPP access technology and is outside the scope of 3GPP.


5GS–Y2

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between  untrusted non-3GPP access
and  N3IWF

see it   here

specified from  Rel-15  in
TS 23.501, clause 4.2.8.3 

This is used for the transport of NWu traffic.



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