Apparatus and method for transmitting muting information, and apparatus and method for acquiring channel state using same
View Patent ↗The present disclosure relates to an apparatus and a method for transmitting muting information in a wireless communication system, and to an apparatus and a method for acquiring channel state using same. In an exemplary embodiment, muting information includes: a first data field, having a serving cell for receiving from peripheral cells in a multi-cell environment, at least one of a CSI-RS pattern, the number of CSI-RS antenna ports, a CSI-RS duty cycle, and CSI-RS transmission subframe offset information, and using same for expressing the cycle and the offset of muting subframes, which pertain to information on a resource block that can generate interference between the peripheral cells and CSI-RS; and a second data field for expressing a specific muting pattern, which must be muted within the muting subframes, having either 12 bits or 28 bits that display muting application in a bitmap format.
1. A method for transmitting Channel State Information-Reference Signal (CSI-RS) muting information to a user equipment by a specific cell, the method comprising:
generating CSI-RS muting information including a first data field that indicates a cycle and an offset of muting subframes and a second data field having an n-bit bitmap, the n being an integer among 12 to 28, and each bit of the n-bit bitmap indicating whether to apply muting in the muting subframes;
transmitting the CSI-RS muting information to the user equipment;
mapping data to resource elements using the CSI-RS muting information, the mapping process including a muting for zero power transmission; and
transmitting a signal including the mapped data to the user equipment.
2. The method as claimed in claim 1 , further comprising:
receiving CSI-RS information of a neighboring cell, the CSI-RS information of the neighboring cell including at least one of a CSI-RS pattern of the neighboring cell, the number of CSI-RS antenna ports of the neighboring cell, a CSI-RS transmission cycle (duty cycle) of the neighboring cell, CSI-RS transmission subframe offset information of the neighboring cell; and
determining a muting region based on the CSI-RS information of the neighboring cell, the muting region configured to mute the CSI-RS pattern of the neighboring cell.
3. The method as claimed in claim 1 , wherein the first data field is configured based on locations of the muting subframes to which the muting is applied and a relation between CSI-RS transmission cycles and CSI-RS transmission offset of the specific cell or the neighboring cell.
4. The method as claimed in claim 1 , wherein each bit of the n-bit bitmap indicates whether to apply muting for resource elements corresponding to a CSI-RS pattern for a specific number of antenna ports.
5. The method as claimed in claim 1 , wherein the second data field is configured as a 16-bit bitmap, each bit of the 16-bit bitmap indicating a CSI-RS pattern to be muted based on a specific number of antenna ports.
6. The method as claimed in claim 1 , wherein the second data field indicates a muting pattern group comprising a muting pattern, the muting pattern group is configured based on a specific number of antenna ports, and resource regions that belong to the muting pattern group are muted based on a bit value of a bitmap of the second data field.