Apparatus and method for transmitting muting information, and apparatus and method for acquiring channel state using same

A method for acquiring a channel state of each cell after receiving CSI-RSs from two or more cells by a receiver, the method comprising:

• receiving muting information including a first data field that indicates a cycle and an offset of muting subframes from a serving cell out of two or more cells and a second data field that indicates a specific muting pattern in which muting is to be performed in the muting subframes and has one bit number among 12 bits to 28 bits, which indicates, in a bitmap format, whether to apply muting;
• receiving CSI-RSs of the neighboring cell transmitted from a resource region of a neighboring cell corresponding to a partial region muted based on the muting information in a resource space for transmitting CSI-RSs of the serving cell and data of the serving cell;
• identifying a muting region in a resource space for transmitting data of the serving cell using the muting information and identifying a region for transmitting the CSI-RSs of a neighboring cell corresponding thereto;
• and
• acquiring a channel state by decoding the CSI-RSs of the serving cell and the neighboring cell considering the muting region.

An apparatus for transmitting CSI-RS muting information, comprising:

• a neighboring cell information receiver that receives, from one or more neighboring cells in a multicell environment, CSI-RS information of the neighboring cells including at least one of CSI-RS patterns, the number of CSI-RS antenna ports, CSI-RS transmission cycles (Duty Cycle), and CSI-RS transmission subframe offset information;
• a muting region determining unit that determines a muting region which is a time/frequency resource region that overlaps with a CSI-RS of the neighboring cell and therefore requires muting in a resource space for transmitting data of a serving cell based on the CSI-RS information of the neighboring cell;
• a muting information generating unit that generates muting information including a first data field which indicates the muting region and indicates a cycle and an offset of muting subframes and a second data field which indicates a specific muting pattern to be muted in the muting subframes and has one bit number among 12 bits to 28 bits, which indicates, in a bitmap format, whether to apply muting;
• and
• a muting information transmitter that transmits the generated muting information to a user equipment (UE).

An apparatus for acquiring a channel state of each cell after a receiver receives CSI-RSs from two or more cells, the apparatus comprising:

• a muting information receiver that receives muting information including a first data field that indicates a cycle and an offset of muting subframes from a serving cell out of two or more cells and a second data field that indicates a specific muting pattern in which muting is to be performed in the muting subframes and has one bit number among 12 bits to 28 bits, which indicates, in a bitmap format, whether to apply muting;
• a CSI-RS receiver that receives CSI-RS signals of the neighboring cell transmitted from a resource region of a neighboring cell corresponding to a partial region muted based on the muting information in a resource space for transmitting CSI-RSs of the serving cell and data of the serving cell;
• a muting region identifying unit that identifies a muting region in a resource space for transmitting data of the serving cell using the muting information and identifies a resource region for transmitting CSI-RSs of a neighboring cell corresponding thereto;
• and
• a channel state acquiring unit that acquires a channel state by decoding the CSI-RS signals of the serving cell and the neighboring cell considering the muting region.