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US 7,680,149 B2Granted
CPRI link multiplex transmission method and system
AssigneeUtstarcom Telecom Co., Ltd.
InventorsSheng Liu, Bill Huang
Life of this patent
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Abstract
A communication method between the units of a distributed base station system, characterized by comprising: at the transmitting end, mapping a CPRI link to a GFP-T frame; encapsulating the GFP-T frame into SDH virtual containers to form a STM-N frame; and transmitting the STM-N frame via a SDH line, and at the 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.
Claims37
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.
18 more elements
A transceiver device in a distributed base station system for transmitting and receiving Common Public Radio Interface (CPRI) frames via a Common Public Radio Interface (CPRI) link and transmitting and receiving Synchronous Transfer Module-Level N (STM-N) frames via a Synchronization Digital Hierarchy (SDH) link, the transceiver device comprising:
- a transmission processing device, comprising:
- means for mapping a CPRI link to a General Framing Protocol-Transparent (GFP-T) frame;
- means for encapsulating the GFP-T frame into SDH virtual containers;
- and
- means for forming a STM-N frame;
- and
- a reception processing device, comprising:
- means for separating the SDH virtual containers from a STM-N frame;
- means for extracting a GFP-T frame from the SDH virtual containers;
- and
- means for reproducing a CPRI frame from the GFP-T frame;
- wherein said means for mapping comprises:
- means for performing compression to a basic CPRI frame before the mapping to remove reserved bits, the means for performing compression including information indicating compression state of the CPRI frame in the GFP-T frame;
- and
- means for transmitting information indicating the format in the uncompressed basic CPRI frame, and
- said means for reproducing comprising:
- means for determining whether the basic CPRI frame is compressed based on said information indicating the compression state, and if the basic CPRI frame is compressed, decompressing the compressed basic CPRI frame based on said format information of the basic CPRI frame;
- 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.
17 more elements
A remote radio frequency unit in a distributed base station system for transmitting and receiving Synchronous Transfer Module-Level N (STM-N) frames via a Synchronization Digital Hierarchy (SDH) link, the remote radio frequency unit comprising:
- a transmission processing device, comprising:
- means for mapping a Common Public Radio Interface (CPRI) link to a General Framing Protocol-Transparent (GFP-T) frame;
- means for encapsulating the GFP-T frame into SDH virtual containers;
- and
- means for forming a STM-N frame;
- and
- a reception processing device, comprising:
- means for separating the SDH virtual containers from a STM-N frame;
- means for extracting a GFP-T frame from the SDH virtual containers;
- and
- means for reproducing a CPRI frame from the GFP-T frame;
- wherein said means for mapping comprises:
- means for performing compression to a basic CPRI frame before the mapping to remove reserved bits, the means for performing compression including information indicating compression state of the CPRI frame in the GFP-T frame;
- and
- means for transmitting information indicating the format in the uncompressed basic CPRI frame, and
- said means for reproducing comprising:
- means for determining whether the basic CPRI frame is compressed based on said information indicating the compression state, and if the basic CPRI frame is compressed, decompressing the compressed basic CPRI frame based on said format information of the basic CPRI 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.
16 more elements
A primary baseband processing unit in a distributed base station system for transmitting and receiving Synchronous Transfer Module-Level N (STM-N) frames via a Synchronization Digital Hierarchy (SDH) link, the primary baseband processing unit comprising:
- a transmission processing device, comprising:
- means for mapping a Common Public Radio Interface (CPRI link to a General Framing Protocol-Transparent (GFP-T) frame;
- means for encapsulating the GFP-T frame into SDH virtual containers;
- and
- means for forming a STM-N frame;
- and
- a reception processing device, comprising:
- means for separating the SDH virtual containers from a STM-N frame;
- means for extracting a GFP-T frame from the SDH virtual containers;
- and
- means for reproducing a CPRI frame from the GFP-T frame;
- said means for mapping comprises:
- means for performing compression to a basic CPRI frame before the mapping to remove reserved bits, the means for performing compression including information indicating compression state of the CPRI frame in the GFP-T frame;
- and
- means for transmitting information indicating the format in the uncompressed basic CPRI frame, and
- said means for reproducing comprising:
- means for determining whether the basic CPRI frame is compressed based on said information indicating the compression state, and if the basic CPRI frame is compressed, decompressing the compressed basic CPRI frame based on said format information of the basic CPRI 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.
15 more elements
A distributed base station system, wherein a remote radio frequency unit communicates with a primary baseband processing unit through an integrated or separate transceiver device via a SDH link, wherein the transceiver device comprises:
- a transmission processing device, comprising:
- means for mapping a CPRI link to a GFP-T frame;
- means for encapsulating the GFP-T frame into SDH virtual containers;
- and
- means for forming a STM-N frame;
- and
- a reception processing device, comprising:
- means for separating SDH virtual containers from a STM-N frame;
- means for extracting a GFP-T frame from the SDH virtual containers;
- and
- means for reproducing a CPRI frame from the GFP-T frame;
- wherein said means for mapping comprises:
- means for performing compression to a basic CPRI frame before the mapping to remove reserved bits, the means for performing compression including information indicating compression state of the CPRI frame in the GFP-T frame;
- and
- means for transmitting information indicating the format in the uncompressed basic CPRI frame, and
- said means for reproducing comprising:
- means for determining whether the basic CPRI frame is compressed based on said information indicating the compression state, and if the basic CPRI frame is compressed, decompressing the compressed basic CPRI frame based on said format information of the basic CPRI frame;
- wherein
- said basic CPRI frame format information is included in a 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.
17 more elements
Dependencies are inferred from the claim text.