Patent ID: 7680149

Claim:
A communication method between the units of a distributed base station system, the method comprising: at a transmitting end, mapping a Common Public Radio Interface (CPRI) ink to a General Framing Protocol-Transparent (GFP-T) frame; encapsulating the GFP-T frame into Synchronization Digital Hierarchy (SDH) virtual containers to form a Synchronous Transfer Module-Level N (STM-N) frame; and transmitting the STM-N frame via a SDH line, and at a receiving end, receiving the STM-N frame transmitted via the SDH line; separating the SDH virtual containers from the STM-N frame; extracting the GFP-T frame from the SDH virtual containers; reproducing the CPRI link from the GFP-T frame; wherein said mapping step comprises: performing compression on the basic CPRI frame to remove reserved bits before the mapping; including information indicating the compression state of the CPRI frame in the GFP-T frame; and transmitting information indicating the format in the uncompressed basic CPRI frame, and said reproducing step further comprises: determining if the basic CPRI frame is compressed based on the information indicating the compression state; if the basic CPRI frame is compressed, decompressing the compressed basic CPRI frame based on said basic CPRI frame format information; wherein said basic CPRI frame format information is included in a General Framing Protocol (GFP) client management frame corresponding to the GFP-T frame into which the basic CPRI frame is mapped; and the reserved value between 00000011 and 11111110 in the GFP client management frame is used to indicate carrying said basic CPRI frame format information.