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 base station to transmit Channel State Information-Reference Signal (CSI-RS) muting information to a user equipment, the base station corresponding to a specific cell, the base station comprising:
a processor configured to generate 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; and
a transmitter configured to transmit the CSI-RS muting information to the user equipment,
wherein the processor is configured to map data to resource elements using the CSI-RS muting information, the mapping process including a muting for zero power transmission, and
wherein the transmitter is configured to transmit a signal including the mapped data to the user equipment.
2. The base station as claimed in claim 1 , further comprising:
a receiver to receive 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,
wherein the processor is configured to determine 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 base station 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 base station 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 base station 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 base station 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.
7. A method for receiving Channel State Information-Reference Signal (CSI-RS) muting information from a serving cell, the method comprising:
receiving 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 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;
receiving a signal including data, mapped to resource elements using the CSI-RS muting information, the mapping process including a muting for zero power transmission.
8. The method as claimed in claim 7 , further comprising:
receiving CSI-RSs of a neighboring cell transmitted from a resource region of the 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 the 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.
9. The method as claimed in claim 7 , 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 serving cell or the neighboring cell.
10. The method as claimed in claim 7 , 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.
11. The method as claimed in claim 7 , 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.
12. A user equipment to receive Channel State Information-Reference Signal (CSI-RS) muting information from a serving cell, the user equipment comprising:
a processor configured to receive and determine 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 n-bit bitmap, the n being an integer among 12 to 28, each bit of the n-bit bitmap indicating whether to apply muting in the muting subframes; and
a receiver to receive a signal including data, mapped to resource elements using the CSI-RS muting information, the mapping process including a muting for zero power transmission.
13. The user equipment as claimed in claim 12 , wherein:
the receiver receives CSI-RSs of a neighboring cell transmitted from a resource region of the 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, and
wherein the processor is configured to identify a muting region in a resource space for transmitting data of the serving cell using the muting information and to identify a region for transmitting the CSI-RSs of the neighboring cell corresponding thereto, and to acquire a channel state by decoding the CSI-RSs of the serving cell and the neighboring cell considering the muting region.
14. The user equipment as claimed in claim 12 , 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 serving cell or the neighboring cell.
15. The user equipment as claimed in claim 12 , 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.
16. The user equipment as claimed in claim 12 , 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.