A method for controlling transfer of network traffic of network resources (12a, b, c, d, e) comprising a first radio base station (12a) having a first transport link (18a), and a second radio base station (12b) having a second transport link (16b), of a wireless communications system (10), the method comprising: —performing (22) radio access network, RAN, handling, wherein the RAN handling comprises: —analyzing (23) transport link characteristics of the transport links (16a, 16b); —selecting (24) transport Sink (16a, 16b) based on the analysis of the characteristics of the transport links (16a, 16b) available for network traffic using a network resource controller (19) configured to control the network resources (12a, b, c, d, e). There is also provided an apparatus (18) for performing the method. In this way there is provided a method and apparatus for controlling transfer of network traffic taking the different and varying transport characteristics of individual transport links of different radio base stations and radio access technologies into account.