Apparatus and method for data transmission

that is executed by an access point, a method is described, and are received at the requests from a number of user devices, each of said requests indicates at least one or more requested file blocks of a file. A set of multicast groups is determined based on the received requests, each multicast group is a set of indices of one or more of the user devices and a set of indices of the file blocks to which user devices are indicated in the multicast group to be transmitted contains. the file blocks indicated in the multicast group are retrieved and encoded for each multicast group of the amount, wherein a forward error correction method is used. the indexed in the multicast group encoded file blocks are transmitted to the indexed in the multicast group user devices for each of the multicast groups of the set. Other methods and access points, user devices and machine-readable media are also disclosed.