Method and apparatus for data communication between MU and RU using multi-channel compression algorithm

1. A master unit comprising:

a processor;

a memory configured to store a program executed by the processor; and

a communication interface,

wherein the processor is configured to compress control management data to be allocated to a sub-channel of a common public radio interface (CPRI), and

the communication interface is configured to transmit the compressed control management data to a radio unit through the sub-channel of the CPRI,

wherein the processor is configured to select one compression algorithm from a plurality of compression algorithms according to a reference data size, and apply the selected compression algorithm to compress the control management data, and

the sub-channel to which the compressed control management data are allocated includes (i) a first flag having information about whether the sub-channel is compressed and (ii) a second flag having information about the selected compression algorithm.

2. The master unit of claim 1 , wherein the CPRI is defined as a plurality of basic frames constituting a hyper frame, in which each basic frame includes a control word and a payload,

the payload corresponds to an in-phase and quadrature data (IQ data) block of user data, and

K control words gather to form M sub-channels, wherein M is a natural number less than K.

3. The master unit of claim 1 , wherein the control management data to be allocated to the sub-channel of the CPRI include (i) fast control management (C&M) data, (ii) slow control and management (C&M) data, and (iii) first layer in-band protocol data, and (iv) vendor specification data, and

the compressed control management data are compressed for each sub-channel in relation to a part or all of (i) the fast C&M data, (ii) the slow C&M data, (iii) the first layer in-band protocol data, and (iv) the vendor specification data.

4. The master unit of claim 1 , wherein the plurality of compression algorithms are selected from LZ4 compression scheme, Snappy compression scheme, Brotli compression scheme, Zstandard compression scheme, and Gzip compression scheme.

5. A radio unit comprising:

one or more processors;

a memory configured to store one or more programs executed by the one or more processors; and

a communication interface,

wherein the communication interface is configured to receive control management data compressed by a master unit through a sub-channel of a common public radio interface (CPRI), and

the one or more processors are configured to restore the compressed control management data allocated to the sub-channel of the CPRI,

wherein the sub-channel to which the compressed control management data are allocated includes (i) a first flag having information about whether the sub-channel is compressed and (ii) a second flag having information about a compression algorithm, and

the one or more processors are configured to select the compression algorithm from a plurality of compression algorithms according to the first flag and the second flag, and apply the selected compression algorithm to restore the compressed control management data.

6. The radio unit of claim 5 , wherein the plurality of compression algorithms are selected from LZ4 compression scheme, Snappy compression scheme, Brotli compression scheme, Zstandard compression scheme, and Gzip compression scheme.

7. The radio unit of claim 5 , wherein the CPRI is defined as a plurality of basic frames constituting a hyper frame, in which each basic frame includes a control word and a payload,

the payload corresponds to an in-phase and quadrature data (IQ data) block of user data, and

K control words gather to form M sub-channels, wherein M is a natural number less than K.

8. The radio unit of claim 5 , wherein the compressed control management data are compressed for each sub-channel in relation to a part or all of (i) fast C&M data, (ii) slow control and management (C&M) data, (iii) first layer (L1) in-band protocol data, and (iv) vendor specification data.

9. A radio access network system comprising:

a master unit and a radio unit communicating through a common public radio interface (CPRI),

wherein the master unit is configured to compress control management data to be assigned to a sub-channel of the CPRI, and transmit the compressed control management data to the radio unit through the sub-channel of the CPRI, and

the radio unit is configured to receive the control management data compressed by the master unit through the sub-channel of the CPRI and restore the compressed control management data allocated to the sub-channel of the CPRI,

wherein the master unit is configured to select one compression algorithm from a plurality of compression algorithms according to a reference data size and compress the control management data by applying the selected compression algorithm, and

the sub-channel to which the compressed control management data are allocated includes (i) a first flag having information about whether the sub-channel is compressed and (ii) a second flag having information about the selected compression algorithm.

10. The radio access network system of claim 9 , wherein the CPRI is defined as a plurality of basic frames constituting a hyper frame, in which each basic frame includes a control word and a payload,

the payload corresponds to an in-phase and quadrature data (IQ data) block of user data, and

K control words gather to form M sub-channels, wherein M is a natural number less than K.

11. The radio access network system of claim 9 , wherein the compressed control management data are compressed for each sub-channel in relation to a part or all of (i) fast C&M data, (ii) slow control and management (C&M) data, (iii) first layer (L1) in-band protocol data, and (iv) vendor specification data.