Apparatuses, methods, and systems are disclosed for measuring access network performance (“ANP”) parameters for a multi-access data connection. One apparatus includes a transceiver that communicate with at least one function in a mobile communication network and a processor coupled to the transceiver. The processor is configured to cause the apparatus to: receive, from a network function, a policy request message indicating a remote unit requesting a multi-access data supports access network performance measurements; derive at least one traffic steering rule that contains an ANP parameter; determine measurement assistance information for the remote unit in response to the at least one traffic steering rule that contains an ANP parameter; and return the at least one traffic steering rule that contains an ANP parameter and the measurement assistance information in response to the policy request message.