A method (900) for medium access reservation in a multiband wireless network comprises determining available slots (220) for reservation in a superframe (210) for reservation across multiple channels (S910); generating channel reservation protocol (CRP) availability information element (IE) (310) to indicate the available slots on a main channel; generating one or more Extended-Channel CRP availability IEs (500) to indicate the available slots on one or more respective extended channels (S920); exchanging the CRP availability IE and the Extended-Channel CRP availability IEs between a receiving device and a transmitting device (S930); and generating a Multiband CRP IE (600) to reserve slots that are available on the receiving device and the transmitting device (S940).