A method in a base station for adapting prioritization of a service of a user equipment over services of other user equipments is provided. The prioritization relates to a transmission between the base station and the user equipment at a scheduling occasion. The prioritization relates to an initial value. The base station decides (302) that the user equipment is in congestion, when an instant scheduling bit rate for the transmission in relation to a bit rate related to the service is below a first threshold. When the user equipment is in congestion, the base station adapts (304) the prioritization by down prioritizing the service of the user equipment in relation to the initial value, until a timer has expired.