Method and apparatus for transmitting downlink reference signal in wireless communication system that supports multiple antennas
First Claim
1. A method for transmitting reference signals for 8 or fewer antenna ports at a base station, the method comprising:
- transmitting common reference signals (CRSs) for four or fewer antenna ports in a downlink subframe including a first slot and a second slot, wherein the downlink subframe has an extended cyclic prefix (CP) configuration; and
transmitting channel state information-reference signals (CSI-RSs) for the 8 or fewer antenna ports, the CSI-RSs being mapped to the downlink subframe according to a predetermined pattern,wherein the predetermined pattern defines the CSI-RSs for the 8 or fewer antenna ports to be mapped to two orthogonal frequency division multiplexing (OFDM) symbols in a data region of the downlink subframe, wherein the two OFDM symbols defined in the predetermined pattern for the CSI-RSs are second and third OFDM symbols of the second slot, andwherein the predetermined pattern for the CSI-RSs is used when the CRSs are configured for 2 or fewer antenna ports.
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Accused Products
Abstract
A method for transmitting a reference signal for a maximum of eight antenna ports includes mapping a portion of common reference signals (CRSs) for a maximum of four antenna ports into a downlink subframe that includes a 1st slot and a 2nd slot; mapping channel status information reference signals (CSI-RSs) for the maximum of eight antenna ports into the downlink subframe according to a preset pattern; and transmitting the downlink subframe into which the common reference signal and the channel status information reference signal are mapped, wherein the preset pattern defines the CSI-RSs for the maximum of eight antenna ports to be mapped onto two OFDM symbols of the data region in the downlink subframe, and wherein the portion of the CRSs for the maximum of four antenna ports is limited to the CRSs for a maximum of two antenna ports.
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Citations
13 Claims
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1. A method for transmitting reference signals for 8 or fewer antenna ports at a base station, the method comprising:
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transmitting common reference signals (CRSs) for four or fewer antenna ports in a downlink subframe including a first slot and a second slot, wherein the downlink subframe has an extended cyclic prefix (CP) configuration; and transmitting channel state information-reference signals (CSI-RSs) for the 8 or fewer antenna ports, the CSI-RSs being mapped to the downlink subframe according to a predetermined pattern, wherein the predetermined pattern defines the CSI-RSs for the 8 or fewer antenna ports to be mapped to two orthogonal frequency division multiplexing (OFDM) symbols in a data region of the downlink subframe, wherein the two OFDM symbols defined in the predetermined pattern for the CSI-RSs are second and third OFDM symbols of the second slot, and wherein the predetermined pattern for the CSI-RSs is used when the CRSs are configured for 2 or fewer antenna ports. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of, at a user equipment, estimating a channel using channel state information-reference signals (CSI-RSs) for 8 or fewer antenna ports from a base station, the method comprising:
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receiving common reference signals (CRSs) for four or fewer antenna ports and the CSI-RSs for the 8 or fewer antenna ports in a downlink subframe including a first slot and a second slot, the CSI-RSs being mapped to the downlink subframe according to a predetermined pattern; and estimating the channel using the CSI-RSs, wherein the downlink subframe has an extended cyclic prefix (CP) configuration, wherein the predetermined pattern defines the CSI-RSs for the 8 or fewer antenna ports to be mapped to two orthogonal frequency division multiplexing (OFDM) symbols in a data region of the downlink subframe, wherein the two OFDM symbols defined in the predetermined pattern for the CSI-RSs are second and third OFDM symbols of the second slot, and wherein the predetermined pattern for the CSI-RSs is used when the CRSs are configured for 2 or fewer antenna ports.
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12. A base station for transmitting reference signals (RSs) for 8 or fewer antenna ports, the base station comprising:
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a reception module configured to receive an uplink signal from a user equipment; a transmission module configured to transmit a downlink signal to the user equipment; and a processor configured to control the base station including the reception module and the transmission module, wherein the processor of is further configured to transmit common reference signals (CRSs) for four or fewer antenna ports in a downlink subframe including a first slot and a second slot, and to transmit channel state information-reference signals (CSI-RSs) for the 8 or fewer antenna ports, the CSI-RSs being mapped to the downlink subframe according to a predetermined pattern, wherein the downlink subframe has an extended cyclic prefix (CP) configuration, wherein the predetermined pattern defines the CSI-RSs for the 8 or fewer antenna ports to be mapped to two orthogonal frequency division multiplexing (OFDM) symbols in a data region of the downlink subframe, wherein the two OFDM symbols defined in the predetermined pattern for the CSI-RSs are second and third OFDM symbols of the second slot, and wherein the predetermined pattern for the CSI-RSs is used when the CRSs are configured for 2 or fewer antenna ports.
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13. A user equipment for estimating a channel using channel state information-reference signals (CSI-RSs) for 8 or fewer antenna ports from a base station, the user equipment comprising:
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a reception module configured to receive a downlink signal from the base station; a transmission module configured to transmit an uplink signal to the base station; and a processor configured to control the user equipment including the reception module and the transmission module, wherein the processor is further configured to receive common reference signals (CRSs) for four or fewer antenna ports and the CSI-RSs for the 8 or fewer antenna ports in a downlink subframe including a first slot and a second slot, the CSI-RSs being mapped to the downlink subframe according to a predetermined pattern, and to estimate the channel using the CSI-RSs, wherein the downlink subframe has an extended cyclic prefix (CP) configuration, wherein the predetermined pattern defines the CSI-RSs for the 8 or fewer antenna ports to be mapped to two orthogonal frequency division multiplexing (OFDM) symbols in a data region of the downlink subframe, wherein the two OFDM symbols defined in the predetermined pattern for the CSI-RSs are second and third OFDM symbols of the second slot, and wherein the predetermined pattern for the CSI-RSs is used when the CRSs are configured for 2 or fewer antenna ports.
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Specification