Abstract: Disclosed is a method comprising measuring a first power value in a first channel before transmitting a first signal in a second channel A first transmit power value is then determined for transmitting the first signal in the second channel. In addition, a second power value in the first channel is estimated, while transmitting the first signal in the second channel, wherein the second power value is estimated based on at least the measured first power value and the first transmit power value. Further, a third power value is measured in the first channel, while transmitting the first signal in the second channel.

Abstract: A method of communicating between nodes on a plurality of channels within the unlicensed spectrum is disclosed where coordination of the acquiring of the different channels is provided so that a further channel is acquired prior to the occupancy time of the currently used channel expiring. The method involves determining at one node that a channel in the unlicensed band has been acquired for a predetermined occupancy time. Initiating a scan of at least one further channel within the unlicensed spectrum to determine if a further channel is available. Once a predetermined time has passed and within the predetermined occupancy time, acquiring the available channel by transmitting a signal on it.