An apparatus and method of determining an allocation of data across multiple data communications networks. A respective characteristic of the first data communications network and the second data communication network are determined based on receiving a respective first and second portion of a data set sent through respective channels to a receiver. Based on determining these respective characteristics and based upon the respective characteristics, an allocation of data between the first data communications network and the second communications network is determined such that the allocation satisfies at least one data transfer performance requirement associated with the data set.