tokens: ['The', 'UE', 'supporting', 'UAS', 'services', 'may', 'request', 'a', 'PDN', 'connection', 'for', 'USS', 'communication', 'during', 'attach', 'and', 'UErequested', 'PDN', 'connectivity', 'procedures', 'see', 'clause', '', 'and', '', 'In', 'the', 'request', 'of', 'the', 'PDN', 'connection', 'for', 'USS', 'communication', 'the', 'UE', 'provides', 'CAAlevel', 'UAV', 'ID', 'to', 'the', 'network', 'via', 'the', 'protocol', 'configuration', 'options', 'and', 'the', 'network', 'may', 'decide', 'to', 'perform', 'UUAASM', 'procedure', 'If', 'provided', 'by', 'the', 'upper', 'layers', 'a', 'UE', 'supporting', 'UAS', 'services', 'may', 'provide', 'to', 'the', 'network', 'the', 'USS', 'address', 'via', 'the', 'protocol', 'configuration', 'options', 'during', 'attach', 'and', 'UErequested', 'PDN', 'connectivity', 'procedures', 'so', 'that', 'the', 'network', 'may', 'use', 'the', 'information', 'to', 'discover', 'the', 'USS', 'After', 'successful', 'UUAASM', 'procedure', 'the', 'network', 'may', 'initiate', 'the', 'reauthentication', 'or', 'reauthorization', 'procedure', 'for', 'the', 'UE', 'supporting', 'UAS', 'services', 'as', 'a', 'part', 'of', 'networkinitiated', 'EPS', 'bearer', 'context', 'modification', 'procedure', 'If', 'UUAASM', 'fails', 'during', 'the', 'reauthentication', 'or', 'a', 'reauthorization', 'procedure', 'or', 'if', 'the', 'revocation', 'of', 'UUAA', 'is', 'initiated', 'by', 'the', 'network', 'then', 'the', 'associated', 'PDN', 'connection', 'for', 'USS', 'communication', 'is', 'released']