Abstract:
A method of performing a measurement when a mobile terminal is configured with a plurality of component carriers is discussed. The method is performed by the mobile terminal and includes receiving, by the mobile terminal, configuration information from a base station; and performing, by the mobile terminal, the measurement based on the received configuration information. Further, when the received configuration information includes an indication information for the measurement in an extension component carrier among the plurality of component carriers, the measurement in the extension component carrier is based on a channel state information reference signal (CSI-RS), and when the received configuration information does not include the indication information for the measurement in the extension component carrier among the plurality of component carriers, the measurement in the extension component carrier is based on a cell specific reference signal (CRS).
Abstract:
The present invention relates to a wireless access system supporting multi-carrier aggregation (CA) and discloses various methods and devices for aperiodic feedback of channel state information (CSI). The method for aperiodic feedback of the channel state information (CSI) in the wireless access system supporting the multi-carrier aggregation (CA), according to an embodiment of the present invention, comprises the steps of: receiving a first message including an aperiodic CSI request field and uplink grant from a base station; receiving a second message including bitmap information indicating a downlink component carrier (DL CC) subjected to CSI measurement from the base station; measuring the CSI in consideration of at least one of the aperiodic CSI request, uplink grant, and bitmap information; and transmitting the measured CSI to the base station through a physical uplink shared channel (PUSCH) to thereby receive aperiodic feedback of the same.
Abstract:
The present disclosure relates to an operating method of a terminal for transceiving data to/from a base station in a system that supports a plurality of component carriers. The method includes receiving, from the base station, downlink control information (DCI) masked using a terminal identifier (cell-radio network temporary identifier (C-RNTI)) or a semi-persistent scheduling terminal identifier (SPS C-RNTI) through a physical downlink control channel (PDCCH); determining a component carrier for transceiving data to/from the base station; and transceiving data to/from the base station through the determined component carrier. The determining includes determining the component carrier which has received the PDCCH as a component carrier for receiving downlink data, and determining an uplink component carrier linked with the component carrier which has received the PDCCH as a component carrier for transmitting uplink data.
Abstract:
A method for channel measurement is provided when a mobile terminal is configured with a primary component carrier and a secondary component carrier. The mobile terminal receives configuration information for channel measurement in the secondary component carrier from a base station. The mobile terminal derives the channel measurement in the secondary component carrier based on a channel state information reference signal (CSI-RS) when the configuration information includes a first indicator indicating that CSI-RS is used for the channel measurement in the secondary component carrier, or deriving the channel measurement in the secondary component carrier based on a cell-specific reference signal (CRS) when the configuration information does not include the first indicator.
Abstract:
A method of configuring a measurement for a mobile terminal configured with a plurality of component carriers in a wireless communication system is discussed. The method is performed by a base station and includes transmitting, by the base station, configuration information to the mobile terminal. Further, when the transmitted configuration information includes an indication information for the measurement in an extension component carrier among the plurality of component carriers, the measurement in the extension component carrier is based on a channel state information reference signal (CSI-RS), and when the transmitted configuration information does not include the indication information for the measurement in the extension component carrier among the plurality of component carriers, the measurement in the extension component carrier is based on a cell specific reference signal (CRS).
Abstract:
A method of receiving a channel state information (CSI) report by a base station in a wireless communication system; the BS station (BS) therefore; a method of transmitting a CSI report by a user equipment (UE) in a wireless communication system; and the UE therefore are discussed. The method of receiving a CSI report according to one embodiment includes transmitting, via radio resource control (RRC) signaling, information for configuring at least one secondary cell (SCell) in addition to a primary cell (PCell) and a plurality of periodic CSI feedback configurations for a plurality of serving cells; and receiving, via a subframe of the PCell, a CSI report for only one of the plurality of serving cells. When CSI reports of two or more serving cells collide, CSI reports are dropped. When CSI reports of different serving cells having a same priority collide, CSI reports are dropped.
Abstract:
The present disclosure relates to an operating method of a terminal for transceiving data to/from a base station in a system that supports a plurality of component carriers. The method includes receiving, from the base station, downlink control information (DCI) masked using a terminal identifier (cell-radio network temporary identifier (C-RNTI)) or a semi-persistent scheduling terminal identifier (SPS C-RNTI) through a physical downlink control channel (PDCCH); determining a component carrier for transceiving data to/from the base station; and transceiving data to/from the base station through the determined component carrier. The determining includes determining the component carrier which has received the PDCCH as a component carrier for receiving downlink data, and determining an uplink component carrier linked with the component carrier which has received the PDCCH as a component carrier for transmitting uplink data.
Abstract:
A method for performing a channel state information (CSI) report in a wireless communication system, can include receiving, at a user equipment, a configuration message on each of a plurality of downlink component carriers (DL CCs), the configuration message including cell indexes indicating serving cells and information used for configuring the CSI report of the serving cells, and transmitting, at the user equipment, a CSI report of only a single serving cell in a corresponding subframe, wherein the transmitting of the CSI report of only the single serving cell including when CSI reports of two or more serving cells of the plurality of serving cells collide with each other in the corresponding subframe, dropping one or more CSI reports having lower priorities, and when CSI reports of different serving cells having a same priority collide with each other in the corresponding subframe, dropping CSI reports of one or more serving cells other than one serving cell having the lowest cell index.
Abstract:
A method is provided or receiving a downlink control information (DCI) from a base station (BS) by a user equipment (UE) in a wireless communication system. The UE monitors a plurality of Physical Downlink Control Channel (PDCCH) candidates having a cyclic redundancy check (CRC) scrambled by a cell radio network temporary identifier (C-RNTI) and having a same payload size in a common search space and a UE-specific search space on a primary cell to receive the DCI from the BS. The common search space and the UE-specific search space are overlapped. If the UE is configured with a carrier indicator field (CIF), determining, by the UE, that only a PDCCH in the common search space is transmitted by the BS from among the plurality of PDCCH candidates. The UE receives a Physical Downlink Shared Channel (PDSCH) corresponding to the PDCCH in the common search space.
Abstract:
The present invention relates to a wireless access system supporting multi-carrier aggregation (CA) and discloses various methods and devices for aperiodic feedback of channel state information (CSI). The method for aperiodic feedback of the channel state information (CSI) in the wireless access system supporting the multi-carrier aggregation (CA), according to an embodiment of the present invention, comprises the steps of: receiving a first message including an aperiodic CSI request field and uplink grant from a base station; receiving a second message including bitmap information indicating a downlink component carrier (DL CC) subjected to CSI measurement from the base station; measuring the CSI in consideration of at least one of the aperiodic CSI request, uplink grant, and bitmap information; and transmitting the measured CSI to the base station through a physical uplink shared channel (PUSCH) to thereby receive aperiodic feedback of the same.