Interdigital Patent Holdings, Inc.

Catalilna Mladin

Michael F Starsinic

Pascal M Adjakple

Quang Ly

Joseph M Murray

Hongkun Li

Jiwan L Ninglekhu

Network Slice Selection Assistance information (NSSA1) may be signaled between User Equipment (UE) and a network. NSSA1 sent from the network to the UE may include, for example. Operating Frequency Band (OFB) for each Single NSSAI(S-NSSA1) in the NSSAI, as well as a Radio Access Technology (RAT) Frequency Selection Priority (RFSP) index, which the network configures as a part of UE access and mobility; subscription, during a UE registration procedure. RAT restrictions may be enhanced to indicate to the UE that certain slices are not accessible via certain RATs. A UE may be provided by the network with an alternative NSSAI and corresponding OFBs for each S-NSSAI thereby indicating to the UE that these S-NSSAI would have been allowed had they been requested. A UE may be able to choose an alternative Allowed NSSAI and send a registration update request to the network.

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Catalilna Mladin