An apparatus (113) comprising means for performing: receiving one or more forwarding tables from a centralized network configuration entity (101) of a time sensitive network, wherein the forwarding tables comprise entry information; and determining, based at least in part on the one or more forwarding tables, rules for mapping at least one uplink data stream of the time sensitive network to at least one of: a protocol data unit session (135, 137) and a quality of service flow (129, 131, 133).