1. A method comprising: requesting registration from an access node (AN); receiving a plurality of intra-user service classes from the AN based on the requesting, where the plurality of intra-user service classes are based on an inter-user quality of service (QoS) class; modifying a plurality of access channel (AC) probe parameters using the plurality of intra-user service classes, wherein the AC probe parameters are modified with at least one of a plurality of AC probe scaling factors, the plurality of AC probe scaling factors comprising a persistence test scaling factor, a probe backoff scaling factor, and a probe sequence backoff scaling factor; and accessing an AC using the modified AC probe parameters.