Data transmission method in GPRS

摘要

The invention relates to a data transmission method between a network part of a General Packet Radio Service and a subscriber terminal. In the method an RLC/MAC (Radio Link Control/Medium Access Control) protocol layer and an LLC (Logical Link Control) protocol layer employing the services of the RLC/MAC protocol layer are used as data link layers. In data transmission an LLC frame of the LLC layer is placed in an RLC data block of the RLC/MAC layer. In accordance with the invention more than two LLC frames are placed in one RLC data block. According to prior art one RLC data block may comprise two different LLC frames at the most. The method is, for example, implemented in such a manner that when the RLC data block includes an RLC header field and an RLC data field then the RLC data block includes a mechanism accurately indicating the LLC frame length in each RLC data block and information about whether another LLC frame will follow said LLC frame or not.