The present invention relates to a method for forwarding MAC protocol data units in a mobile radio communication network from a communication endpoint, herein called sender side, to a peer communication endpoint, herein called receiver side, at least one relay station being used on the path between said communication endpoints. According to the present invention, the method comprises the steps of: Extracting out of topology information available at said sender side at least one indicator describing the path between relay station and said receiver side, Including said indicator of the path between said relay station and said receiver side in said MAC protocol data unit in addition to an indicator of the path between said sender side and said relay station.