A method performed by an associating unit, for setting up bearers in a communications network being congested is provided. The associating unit serves a mobile terminal comprising an application related to communication over the communications network. The associating unit, a network node and the mobile terminal operate in the communications network. The associating unit receives (301) information from the network node. The information is about a current congestion level of the communications network. The associating unit further receives (302) a selected preference level for the application from the mobile terminal. When the communications network is congested, the associating unit sets up (303), a set of bearers with different levels of priority in the communications network, based on the current congestion level of the communications network. This is performed by associating a bearer with its priority level with the application based on the selected preference level of the application. The bearer is set up for the application in mobile terminal for communication over the communications network.