| CPC H04W 4/08 (2013.01) [H04W 84/042 (2013.01)] | 20 Claims |

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1. A method comprising:
sending, by a wireless device to an access and mobility management function (AMF) a non-access stratum (NAS) message indicating a request to establish a packet data unit (PDU) session to join a group communication session, wherein the group communication session is an activated group communication session, the NAS message comprising:
an identifier of the group communication session, wherein the AMF is configured to select a session management function (SMF) for the group communication session based on a query to a network repository function (NRF), wherein the query comprises the identifier of the group communication session;
an identifier of a network slice; and
a protocol configuration option information; and
receiving, by the wireless device from the AMF, a response message indicating acceptance of the request.
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