A communication device comprising a receiver operable to receive radio transmissions according to a first communication protocol; a transmitter operable to transmit radio transmissions according to a second communication protocol; and an arbiter connected to the receiver and the transmitter; wherein radio transmissions from the transmitter are capable of interfering with the reception of radio transmissions by the receiver, and the arbiter is configured to: receive from the transmitter an indication of a first transmit operation intended to be executed during a first time period and one or more intended transmission characteristics of the first transmission operation, including a representation of the intended transmission power; Determining if the receiver intends to perform a communication operation during the first time period; if the receiver intends to perform during the first period a first receive operation having one or more intended receive characteristics, accessing an indication of the receive quality determined by the receiver; Determining a set of one or more threshold transmission characteristics for the first transmission operation in dependence on the transmission characteristics and the reception quality, wherein the threshold transmission characteristics comprise a representation of a maximum transmission power with which the transmitter is allowed to perform the first transmission operation; and causing the transmitter to continue the first transmit operation only if its transmit characteristics are limited according to the threshold transmit characteristics.
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