ARBITRATION CIRCUIT PORTIONS

An arbitration circuit portion is provided for coordinating first and second radio circuit portions arranged to transmit and/or receive radio signals. The arbitration circuit is arranged to receive a communication request signal from the first radio circuit portion and/or the second radio circuit portion; determine an arbitration outcome based at least partially on said communication request signal; and apply said arbitration outcome to the first and/or second radio circuit portions. The arbitration circuit portion is operable in a normal arbitration mode, in which determining the arbitration outcome comprises determining an input state based at least partially on said communication request signal and determining an arbitration outcome that corresponds to said input state according to a set of arbitration rules; and a first radio priority mode in which the arbitration outcome prioritizes all requests from the first radio circuit portion over requests from the second radio circuit portion.