| CPC H04W 48/04 (2013.01) [H04W 16/02 (2013.01); H04W 48/18 (2013.01); H04W 64/003 (2013.01); H04W 76/18 (2018.02); H04W 8/18 (2013.01); H04W 60/00 (2013.01); H04W 64/00 (2013.01)] | 20 Claims |

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1. A method comprising:
receiving, by an access and mobility management function (AMF) from a wireless device, a registration request indicating one or more requested network slices;
sending, by the AMF to a network slice selection function (NSSF), a slice selection request indicating the one or more requested network slices;
receiving, by the AMF from the NSSF:
an indication of a first allowed network slice of the one or more requested network slices;
an indication of a second allowed network slice of the one or more requested network slices; and
a time-based network slice coexistence rule indicating a time duration during which the first allowed network slice and the second allowed network slice are concurrently usable;
sending, by the AMF to the wireless device, at a first time, not within the time duration, a slice selection response indicating acceptance of the first allowed network slice and the second allowed network slice;
enforcing, by the AMF, at a second time, not within the time duration, the time-based network slice coexistence rule, wherein the enforcing comprises one or more of:
initiating a network slice handover, modification, or deletion of the first allowed slice; or
initiating a packet data unit (PDU) session establishment, modification, or deletion of a PDU session of the wireless device.
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