POLLING METHOD OF PROTOCOL DATA UNIT IN TRANSFER BUFFER

摘要

PURPOSE: A polling method of a protocol data unit in a transfer buffer is provided to operate stably a transmission system of a protocol data unit by setting falling bits for one or more protocol data units. CONSTITUTION: Protocol data units requested from a lower layer are sequentially selected from a transfer buffer in order to transfer the protocol data units(S201). The number of the protocol data units are requested by the lower layer. The selected protocol data units are compared with the last protocol data unit within the transfer buffer(S202). The selected protocol data units are compared with the last protocol data unit within a transmission window(S203). A polling bit set in the corresponding protocol data unit and the corresponding protocol data unit is transferred to a receiving side if the selected protocol data unit is the last protocol data unit(S204,S205).