Patent ID: 7508792
Filing Date: 2009-03-24
Classification: H04L,H04W

Abstract:
1. A method for forwarding retransmission protocol related data upon a radio cell change of a communication terminal from a source radio cell to a target radio cell, wherein each of the source and the target radio cells is controlled by a base station of a mobile communication system, the method comprising: forwarding, by the base station controlling the source radio cell, data packets of a retransmission protocol that have not been successfully transmitted to the communication terminal by the base station controlling the source radio cell to the base station controlling said target radio cell, and assigning the communication terminal from the source radio cell to the target radio cell, wherein the data packets of the retransmission protocol are forwarded to the base station controlling the target radio cell via a direct interface between the base station controlling the source radio cell and the base station controlling the target radio cell using a data packet of a frame protocol, and wherein a header of a frame protocol data packet indicates whether the respective forwarded data packets comprised in a payload section of said frame protocol data packet are waiting for initial transmission.