A transmission method for use in a multi-hop wireless communication system is provided. The system includes a source apparatus, a destination apparatus and one or more intermediate apparatuses, said source apparatus being operable to transmit information in a communication direction along a series of links forming a communication path extending from the source apparatus to the destination apparatus via the or each intermediate apparatus, and the or each intermediate apparatus being operable to receive information from a previous apparatus along the path and to transmit the received information to a subsequent apparatus along the path, the system having access to a time-frequency format for use in assigning available transmission frequency bandwidth for transmission in the communication direction during a discrete transmission interval, said format defining a plurality of transmission windows within such an interval, each window occupying a different part of that interval and having a frequency bandwidth profile within said available transmission frequency bandwidth over its part of that interval, each said window being assignable for such a transmission interval to one of said apparatuses for use in transmission. The method includes transmitting reservation information for use in a particular such transmission interval from a first one of said apparatuses to a second one of said apparatuses, the second apparatus being the or one of the intermediate apparatuses, and the reservation information specifying at least one transmission window to be reserved of the particular transmission interval. The method also includes, in the second apparatus, reserving the specified window(s) of the particular transmission interval in dependence upon the received reservation information.