Patent ID: 7653083

Claim:
A method for transmitting signal between a central channel processing Main Unit (MU) and one or more Remote Radio Units (RRUs) in Centralized Base Transceiver Station system using remote radio head (RRH) technology, wherein the transmission channel between the central channel processing Main Unit (MU) and the one or more RRUs uses Synchronous Digital Hierarchy (SDH)/Optical Transmission Network (OTN), the method comprising: dividing the communication interface between the MU and the RRUs into a user plane and a control plane, the user plane mainly for carrying I/Q sampling data concerning the user data, and the control plane mainly for carrying the data concerning control signaling; forming the I/Q sampling data concerning the user data carried by the user plane into an I/Q data frame via an I/Q data frame adaptation layer, then forming the I/Q data frame into a GFP frame via Generic Framing Procedure (GFP) and transmitting it on SDH/OTN; and carrying the control signaling of the control plane on User Data Protocol (UDP)/Internet Protocol (IP) and/or Transmission Control Protocol (TCP)/Internet Protocol (IP), and further carrying IP packet on Point to Point Protocol (PPP) and forming it into a frame by High-Level Data Link Control (HDLC), transmitting the HDLC frame including the control plane signaling on the SDH/OTN via control character channel of the GFP frame; further including the step of transmitting control plane signaling frame using the control character channel of a GFP-T client data frame, comprising: at the transmitting end: forming the I/Q sampling data into an I/Q data frame via the I/Q data frame adaptation layer; processing the I/Q data frame by a transmission scheduling unit and then mapping it into a 64B/65B code block by a 64B/65B coding unit so as to form a GFP-T client data frame, wherein the 64B/65B code block includes a padding character and the control plane signaling frame character, as well as the data character of the I/Q data frame; forming the formed GFP-T frame into VC (Virtual Container)/ODU (Optical Channel Data Unit) by a VC/ODU Mapping/concatenating unit, then further forming a STM-N/OTM-n frame; and at the receiving end: separating the corresponding VC/ODU from the STM-N/OTM-n frame and extracting its payload; obtaining the 64B/65B code blocks after being processed by a GFP-T frame processing unit, separating the I/Q data frame character stream and the control plane signaling frame character stream by a 64B/65B decoding unit, wherein the I/Q data frame character stream is further processed by an I/Q data frame processing unit to obtain the respective I/Q data streams of respective carrier frequencies from respective antennas.