Methods and apparatus enabling interruption of the use of communication resources by a first UE are disclosed. Interrupt requests (IR) sent from other UEs wishing to interrupt use of the communication resources by the first UE are monitored. If one or more IR are received, an interrupt requirement (IReg) is established, and the allocation of communication resources to the first UE is released in response to the IReq. In some embodiments, if a requirement for continuing use of the communication resources by the first UE is determined during a monitoring period, the IReq is reversed and the allocation of communication resources to the first UE is continued so that communication is not interrupted. Embodiments of the invention enable interruption of a high priority user by a co-ordinated or synchronised interrupt requests from UEs with lower priority.