Methods and systems for managing prioritisation and conflicts in a cellular communication network are provided. Mapping restrictions between logical channels and uplink grants are utilised. In a specific example there is disclosed a method of reducing collisions of uplink (UL) data transmissions from a UE of a wireless communication network to a base station of the wireless communication network, comprising the steps of generating an index for each of a plurality of configured UL grant configurations, modifying a logical channel mapping restrictions to include one or more of the configured UL grant configuration indexes, using the one or more configured UL grant configuration indexes to map the logical channel associated with the modified logical channel mapping restrictions parameter to one or more of the configured UL grant configurations, and using the one or more configured UL grant configurations for one or more of the UL data transmissions from the UE.