Methods to handle slicing accounting for evolved packet data gateway Wi-Fi access

1. A method for wireless communications at a user equipment (UE), comprising:

establishing a connection to a legacy core network function of a legacy cellular radio network via a legacy gateway between the legacy cellular radio network and a non-cellular radio network;

identifying, for each traffic descriptor in a set of traffic descriptors, a legacy access policy of the legacy cellular radio network identifying a legacy access preference rule for the UE to adopt for connections to the legacy core network function, each legacy access preference rule indicating for the UE to preferentially connect to the legacy core network function via the legacy cellular radio network or a non-cellular radio network for the traffic descriptor and a legacy slice treatment for the traffic descriptor;

establishing a connection to a core network function of a cellular radio network via a gateway between the cellular radio network and the non-cellular radio network;

identifying, for each traffic descriptor in the set of traffic descriptors, an access policy of the cellular radio network identifying an access preference rule for the UE to adopt for connections to the core network function of the cellular radio network, each access preference rule indicating for the UE to preferentially connect to the core network function via the cellular radio network or the non-cellular radio network for the traffic descriptor and a slice treatment for the traffic descriptor; and

determining, for each traffic descriptor and based at least in part on the legacy slice treatment and the slice treatment and based at least in part on the access policy, to transfer the connection associated with the traffic descriptor to the core network function or to establish an updated connection for the traffic descriptor with the core network function.

2. The method of claim 1 , further comprising:

determining, for at least two traffic descriptors in the set of traffic descriptors, that the legacy traffic descriptor and the traffic descriptor are a same traffic descriptor; and

transferring the connections for the at least two traffic descriptors to the core network function.

3. The method of claim 1 , further comprising:

determining, for at least two traffic descriptors in the set of traffic descriptors, that the legacy traffic descriptor and the traffic descriptor are different traffic descriptors; and

updating the connection for at least one of the two traffic descriptors with the core network function.

4. The method of claim 1 , further comprising:

determining, for at least two traffic descriptors in the set of traffic descriptors that are associated with a same traffic descriptor, that the legacy access policy and the access policy are a same access policy; and

transferring the connections for the at least two traffic descriptors to the core network function.

5. The method of claim 1 , further comprising:

determining, for at least two traffic descriptors in the set of traffic descriptors that are associated with a same traffic descriptor, that the legacy access policy and the access policy are different access policies; and

updating the connection for at least one of the two traffic descriptors with the core network function.

6. The method of claim 1 , wherein:

the cellular radio network comprises a fifth generation (5G) new radio (NR) stand alone (SA) cellular radio network;

the legacy cellular radio network comprises at least one of a fourth generation (4G) long term evolution (LTE) cellular radio network or a 5G NR non-stand alone (NSA) cellular radio network;

the access policy comprises a user equipment (UE) route selection policy (URSP);

the legacy access policy comprises an access network discovery and selection function (ANDSF);

the core network function comprises a 5G NR SA core network (5GC);

the gateway comprises a non-third generation partnership project (3GPP) interworking function (N3IWF) between the core network function of the 5G NR SA cellular radio network and the non-cellular radio network; and

the legacy gateway comprises an evolved packet data gateway (EPDG) between an evolved packet core (EPC) core network function of the 4G LTE cellular radio network or the 5G NR NSA cellular radio network and the non-cellular radio network.

7. The method of claim 1 , further comprising:

receiving a configuration for connections via the non-cellular radio network, the configuration configuring the UE to connect to the legacy core network function or to connect to the core network function via the non-cellular radio network.

8. An apparatus for wireless communications at a user equipment (UE), comprising:

a processing system that includes one or more processors and one or more memories coupled with the one or more processors, the processing system configured to cause the apparatus to:

establish a connection to a legacy core network function of a legacy cellular radio network via a legacy gateway between the legacy cellular radio network and a non-cellular radio network;

identify, for each traffic descriptor in a set of traffic descriptors, a legacy access policy of the legacy cellular radio network identifying a legacy access preference rule for the UE to adopt for connections to the legacy core network function, each legacy access preference rule indicating for the UE to preferentially connect to the legacy core network function via the legacy cellular radio network or a non-cellular radio network for the traffic descriptor and a legacy slice treatment for the traffic descriptor;

establish a connection to a core network function of a cellular radio network via a gateway between the cellular radio network and the non-cellular radio network;

identify, for each traffic descriptor in the set of traffic descriptors, an access policy of the cellular radio network identifying an access preference rule for the UE to adopt for connections to the core network function of the cellular radio network, each access preference rule indicating for the UE to preferentially connect to the core network function via the cellular radio network or the non-cellular radio network for the traffic descriptor and a slice treatment for the traffic descriptor; and

determine, for each traffic descriptor and based at least in part on the legacy slice treatment and the slice treatment and based at least in part on the access policy, to transfer the connection associated with the traffic descriptor to the core network function or to establish an updated connection for the traffic descriptor with the core network function.

9. The apparatus of claim 8 , wherein the processing system is further configured to:

determine, for at least two traffic descriptors in the set of traffic descriptors, that the legacy traffic descriptor and the traffic descriptor are a same traffic descriptor; and

transfer the connections for the at least two traffic descriptors to the core network function.

10. The apparatus of claim 8 , wherein the processing system is further configured to:

determine, for at least two traffic descriptors in the set of traffic descriptors, that the legacy traffic descriptor and the traffic descriptor are different traffic descriptors; and

update the connection for at least one of the two traffic descriptors with the core network function.

11. The apparatus of claim 8 , wherein the processing system is further configured to:

determine, for at least two traffic descriptors in the set of traffic descriptors that are associated with a same traffic descriptor, that the legacy access policy and the access policy are a same access policy; and

transfer the connections for the at least two traffic descriptors to the core network function.

12. The apparatus of claim 8 , wherein the processing system is further configured to:

determine, for at least two traffic descriptors in the set of traffic descriptors that are associated with a same traffic descriptor, that the legacy access policy and the access policy are different access policies; and

update the connection for at least one of the two traffic descriptors with the core network function.

13. The apparatus of claim 8 , wherein:

the cellular radio network comprises a fifth generation (5G) new radio (NR) stand alone (SA) cellular radio network;

the legacy cellular radio network comprises at least one of a fourth generation (4G) long term evolution (LTE) cellular radio network or a 5G NR non-stand alone (NSA) cellular radio network;

the access policy comprises a user equipment (UE) route selection policy (URSP);

the legacy access policy comprises an access network discovery and selection function (ANDSF);

the core network function comprises a 5G NR SA core network (5GC);

the gateway comprises a non-third generation partnership project (3GPP) interworking function (N3IWF) between the core network function of the 5G NR SA cellular radio network and the non-cellular radio network; and

the legacy gateway comprises an evolved packet data gateway (EPDG) between an evolved packet core (EPC) core network function of the 4G LTE cellular radio network or the 5G NR NSA cellular radio network and the non-cellular radio network.

14. The apparatus of claim 8 , wherein the processing system is further configured to:

receive a configuration for connections via the non-cellular radio network, the configuration configuring the UE to connect to the legacy core network function or to connect to the core network function via the non-cellular radio network.

15. An apparatus for wireless communications at a user equipment (UE), comprising:

means for establishing a connection to a legacy core network function of a legacy cellular radio network via a legacy gateway between the legacy cellular radio network and a non-cellular radio network;

means for identifying, for each traffic descriptor in a set of traffic descriptors, a legacy access policy of the legacy cellular radio network identifying a legacy access preference rule for the UE to adopt for connections to the legacy core network function, each legacy access preference rule indicating for the UE to preferentially connect to the legacy core network function via the legacy cellular radio network or a non-cellular radio network for the traffic descriptor and a legacy slice treatment for the traffic descriptor;

means for establishing a connection to a core network function of a cellular radio network via a gateway between the cellular radio network and the non-cellular radio network;

means for identifying, for each traffic descriptor in the set of traffic descriptors, an access policy of the cellular radio network identifying an access preference rule for the UE to adopt for connections to the core network function of the cellular radio network, each access preference rule indicating for the UE to preferentially connect to the core network function via the cellular radio network or the non-cellular radio network for the traffic descriptor and a slice treatment for the traffic descriptor; and

means for determining, for each traffic descriptor and based at least in part on the legacy slice treatment and the slice treatment and based at least in part on the access policy, to transfer the connection associated with the traffic descriptor to the core network function or to establish an updated connection for the traffic descriptor with the core network function.

16. The apparatus of claim 15 , further comprising:

means for determining, for at least two traffic descriptors in the set of traffic descriptors, that the legacy traffic descriptor and the traffic descriptor are a same traffic descriptor; and

means for transferring the connections for the at least two traffic descriptors to the core network function.

17. The apparatus of claim 15 , further comprising:

means for determining, for at least two traffic descriptors in the set of traffic descriptors, that the legacy traffic descriptor and the traffic descriptor are different traffic descriptors; and

means for updating the connection for at least one of the two traffic descriptors with the core network function.

18. The apparatus of claim 15 , further comprising:

means for determining, for at least two traffic descriptors in the set of traffic descriptors that are associated with a same traffic descriptor, that the legacy access policy and the access policy are a same access policy; and

means for transferring the connections for the at least two traffic descriptors to the core network function.

19. The apparatus of claim 15 , further comprising:

means for determining, for at least two traffic descriptors in the set of traffic descriptors that are associated with a same traffic descriptor, that the legacy access policy and the access policy are different access policies; and

means for updating the connection for at least one of the two traffic descriptors with the core network function.

20. The apparatus of claim 15 , wherein:

the cellular radio network comprises a fifth generation (5G) new radio (NR) stand alone (SA) cellular radio network;

the legacy cellular radio network comprises at least one of a fourth generation (4G) long term evolution (LTE) cellular radio network or a 5G NR non-stand alone (NSA) cellular radio network;

the access policy comprises a user equipment (UE) route selection policy (URSP);

the legacy access policy comprises an access network discovery and selection function (ANDSF);

the core network function comprises a 5G NR SA core network (5GC);

the gateway comprises a non-third generation partnership project (3GPP) interworking function (N3IWF) between the core network function of the 5G NR SA cellular radio network and the non-cellular radio network; and

the legacy gateway comprises an evolved packet data gateway (EPDG) between an evolved packet core (EPC) core network function of the 4G LTE cellular radio network or the 5G NR NSA cellular radio network and the non-cellular radio network.