KR20160131944A - Method and apparatus for receiving reference signal - Google Patents

Abstract

Provided are a method and a device for receiving a reference signal from a base station through the following steps of: receiving information with respect to a sub-band, to which the reference signal is allocated, from the base station through upper layer signaling; and receiving the reference signal from a reference signal resource allocated by a sub-band unit.

Description

METHOD AND APPARATUS FOR RECEIVING REFERENCE SIGNAL [0002]

The present disclosure relates to an apparatus and method for receiving a reference signal in a mobile communication system.

A downlink reference signal (RS) of a long term evolution (LTE) system includes a cell specific RS (CRS), a user equipment RS (UE) RS, a positioning RS PRS), and channel state information-RS (CSI-RS). Since the UE-RS is transmitted as a UE-specific physical downlink shared channel (PDSCH), a downlink grant (DL grant) allocated to the UE through the DL grant (DL grant) Only the physical resource block (PRB) included in the PRB pair is present in the other PRB pair. The remaining downlink RSs (CRS, PRS, CSI-RS) are periodically transmitted in all PRB pairs included in the system bandwidth. In this case, the UE uses the CSI-RS in the CSI reference resource defined in the LTE standard to perform CSI (i.e., precoding matrix indicator (PMI) / rank indicator (RI) / channel quality A channel quality indicator (CQI)) can be derived. The CSI derived from the CSI-RS by the UE can be reported to the eNB according to the CSI reporting mode defined in the LTE standard.

One embodiment provides a method of receiving a reference signal.

Another embodiment provides an apparatus for receiving a reference signal.

According to one embodiment, a method is provided in which a terminal receives a reference signal (RS) from a base station. The reference signal receiving method includes the steps of receiving a setting regarding a subband to which a reference signal is allocated through an upper layer signaling from a base station and receiving a subframe including reference signal resources allocated on a subband basis And the reference signal is one of a user equipment-reference signal (UE-RS) or a channel state information-reference signal (CSI-RS).

In the reference signal receiving method, when the reference signal is CSI-RS, the subband includes at least one zero power (ZP) CSI-RS resource and at least one nonzero power (NZP) CSI- RS resources, respectively.

The reference signal reception method may further include receiving information on a subband through an upper layer signaling, and the information on a subband may be an index of a subband allocated with an NZP CSI-RS.

The method of receiving a reference signal may further include receiving information on a subband through downlink control information (DCI), and the information on the subband includes information on a subband allocated with NZP CSI-RS Lt; / RTI >

The reference signal receiving method includes receiving an NZP CSI-RS in an NZP CSI-RS resource, generating a CSI report based on an NZP CSI-RS, and transmitting the CSI report through an uplink grant (UL grant) And transmitting the CSI report to the base station using the uplink resources.

In the reference signal receiving method, the uplink grant may include a CSI trigger for the CSI report.

The reference signal receiving method includes receiving a downlink grant (DL grant) including PDSCH scheduling for rate matching of a physical downlink shared channel (PDSCH), and , And performing rate matching considering the location of a resource element (RE) used by the NZP CSI-RS.

In the case where the base station performs rate matching in a resource block (RB) to which an enhanced physical downlink control channel (EPDCCH) is transmitted, And performing rate matching on the EPDCCH based on the rate matching.

According to another embodiment, a rate matching method for a physical downlink shared channel (PDSCH) of a UE is provided. The rate matching method includes a PDSCH resource element (RE) mapping and a PDSCH RE mapping and quasi-co-location indicator (PQI) in which a location of a reference signal (RS) Field, and performing rate matching based on the PQI field.

Performing rate matching in the rate matching method may include performing rate matching commonly in all resource blocks (RBs) to which the PDSCH is allocated.

The rate matching method may further include receiving a downlink grant (DL grant) including scheduling information for the PDSCH, and performing rate matching may include performing rate matching based on the scheduling information and the PQI field, And performing the steps of:

According to another embodiment of the present invention, there is provided a computer program product comprising at least one processor, a memory, and a wireless communication unit, wherein at least one processor executes at least one program stored in a memory, ), And receiving a sub-frame including a reference signal resource allocated on a sub-band basis, the reference signal being a user equipment-reference signal (UE-RS) or a channel state information-reference signal (CSI-RS).

If the reference signal in the UE is a CSI-RS, the subband includes at least one zero power (ZP) CSI-RS resource and at least one non-zero power (NZP) CSI- Respectively.

The at least one processor in the AT performs at least one program and further receives information on subbands through higher layer signaling, and the information on the subbands includes information on the sub-band allocated to the NZP CSI-RS May be the index of the band.

The at least one processor in the AT performs at least one program to perform the step of receiving information on subbands through downlink control information (DCI) NZP CSI-RS may be the index of the allocated subband.

At least one processor in the terminal executes at least one program to receive an NZP CSI-RS in an NZP CSI-RS resource, a CSI report based on an NZP CSI-RS, and an uplink grant and transmitting the CSI report to the base station using the uplink resource indicated by the uplink grant (UL grant).

In the UE, the uplink grant may include a CSI trigger for the CSI report.

At least one processor in the MS performs at least one program to perform a downlink grant including PDSCH scheduling for rate matching of a physical downlink shared channel (PDSCH) DL grant), and performing rate matching in consideration of the location of a resource element (RE) used by the NZP CSI-RS.

At least one processor in the AT executes at least one program to perform a rate matching on a resource block (RB) in which an enhanced physical downlink control channel (EPDCCH) ), Performing rate matching on the EPDCCH based on the subframe may be further performed.

A CSI report payload can be reduced by transmitting a reference signal (e.g., a UE-RS or a CSI-RS) on a subband-by-subband basis and requesting a terminal to report a subband CSI. Also, multiple CQIs and multiple PMIs can be derived in a specific subband while the CSI payload supported in the existing standard is maintained, and RSs are transmitted on a subband basis, whereby a plurality of RSs in a subframe are divided into frequency division multiplexing, FDM).

It is possible to reduce the payload of the CSI report through the subband CSI report and to multiplex a plurality of RSs in one subframe.

1 is a schematic diagram illustrating CSI-RS resources allocated to a subband according to an embodiment.
2 is a flowchart illustrating a method of setting a subband according to an embodiment of the present invention.
3 is a flow chart illustrating a first rate matching method in accordance with one embodiment.
4 is a flow chart illustrating a second rate matching method according to one embodiment.
5 is a flowchart illustrating a method of setting a subband according to another embodiment.
6 is a flowchart illustrating a first rate matching method according to another embodiment.
7 is a flowchart illustrating a second rate matching method according to another embodiment.
7 is a flowchart illustrating a method of transmitting a beamformed CSI-RS based on an EBF according to an embodiment.
FIG. 8 is a flowchart illustrating a method of generating a CSI report based on a CSI-RS resource pool according to an embodiment.
FIG. 9 is a flowchart illustrating a hybrid CSI-RS transmission method according to an embodiment.
10 is a flowchart illustrating a method of generating a CSI report for a PMU report according to an exemplary embodiment of the present invention.
11 is a block diagram illustrating a wireless communication system according to an embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. However, the present disclosure can be embodied in various different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention in the drawings, parts not related to the description are omitted, and like reference numerals are given to similar parts throughout the specification.

Throughout the specification, a terminal is referred to as a mobile station (MS), a mobile terminal (MT), an advanced mobile station (AMS), a high reliability mobile station A subscriber station (SS), a portable subscriber station (PSS), an access terminal (AT), a user equipment (UE), a machine type communication device MTC device and the like and may include all or some functions of MT, MS, AMS, HR-MS, SS, PSS, AT, UE,

Also, a base station (BS) is an advanced base station (ABS), a high reliability base station (HR-BS), a node B, an evolved node B, eNodeB), an access point (AP), a radio access station (RAS), a base transceiver station (BTS), a mobile multihop relay (MMR) (RS), a relay node (RN) serving as a base station, an advanced relay station (ARS) serving as a base station, a high reliability relay station (HR) (BS), a home Node B (HNB), a home eNodeB (HeNB), a pico BS, a macro BS, a micro BS ), Etc., and all or all of ABS, Node B, eNodeB, AP, RAS, BTS, MMR-BS, RS, RN, ARS, HR- And may include negative functionality.

1 is a schematic diagram illustrating CSI-RS resources allocated to a subband according to an embodiment.

In CSI reporting modes 3-0, 3-1 and 3-2 over a physical uplink shared channel (PUSCH) of the LTE system, the CQI is derived from a higher layer-configured subband , The UE derives CQI and PMI for each subband. In the PUSCH CSI reporting mode 1-2, the UE derives a CQI (wideband CQI) for all subbands and derives a per-subband PMI for each subband. On the other hand, in the PUSCH CSI reporting mode 2-0 and 2-2, the UE derives the CQI from M sub-bands (best M sub-bands) selected by the UE, By adjusting the size of M, the CSI payload can be relatively reduced.

In the PUSCH CSI reporting modes 2-0 and 2-2 of the LTE system, the UE can derive the CSI assuming that the CSI-RS is periodically transmitted (periodic CSI-RS) in a wideband. However, the CSI-RS resource according to an exemplary embodiment does not exist in all subbands, but exists only in a specific subband. For example, the UE receives non-zero power (NZP) CSI-RS and zero power (ZP) in a specific subband among the subbands included in the wide band. If the CSI-RS is transmitted only in a specific subband, the terminal performs PUSCH CSI reporting only in the corresponding subband, so that CSI-RS transmission can be reduced.

According to one embodiment, one subband in one subframe includes at least one RB, and one RB includes at least one NZP CSI-RS resource and a ZP CSI-RS resource. Referring to FIG. 1, one subband is 360 kHz (180 kHz x 2) in the frequency axis, and an RB corresponding to the right slot of each subband includes NZP CSI-RS resources and ZP CSI-RS resources have. In FIG. 1, subbands including NZP CSI-RS resources and ZP CSI-RS resources are indicated by shaded areas. There are two NZP CSI-RS resources and two ZP CSI-RS resources included in each RB, and NZP CSI-RS resources and ZP CSI-RS resources use different REs.

In order to independently transmit UE-specific CSI-RSs used in a multi-input multi-output (MIMO) system, NZP CSI-RSs are transmitted by the number of UEs. When the NZP CSI-RS is transmitted by the number of UEs, the number of resource elements (REs) used for PDSCH transmission is reduced. Therefore, a plurality of terminals need to be appropriately grouped. If metrics used for grouping of UEs are well defined in practice, CQI mismatch may be reduced even if UE-specific CSI-RS resources are replaced with group-specific CSI-RS resources.

According to another embodiment, an NZP / ZP CSI-RS resource is defined for each subband in order to transmit a UE-specific CSI-RS, thereby increasing the multiplexing order of the existing wide band transmission. At this time, the subband may be a readback basic unit of the LTE standard, a set of continuous RBs, or a set of discontinuous RBs. According to the LTE standard subbands, the size of the subbands may be determined by the size k of the subbands according to the downlink system bandwidth of the LTE CSI reporting mode.

Table 1 below shows how the CSI-RS is transmitted. In Case 1-1, the serving base station periodically transmits the CSI-RS in a wide band. In Case 1-2, the serving base station periodically transmits the CSI-RS in a specific subband. In cases 1-3, 1-4-1, and 1-4-2, the serving base station transmits CSI-RS aperiodically. That is, in the case 1-3, the serving base station transmits the CSI-RS in the wide band, and in the case 1-4 (1-4-1 and 1-4-2), the serving base station transmits the CSI- do. In one embodiment, an aperiodic CSI-RS transmission may refer to a trigger of a CSI-RS transmission. In case 1-2 and case 1-4-1, upper layer signaling may be used for a subband indication for subband CSI-RS transmission, and in case 1-4-2, layer, PHY) signaling may be used.

Wide band Subband Top tier configuration
(Higher layer configured) Physical Layer Configuration
(PHY configured) Periodically Case 1-1 Case 1-2 N / A Aperiodic
(Triggering) Case 1-3 Case 1-4-1 Case 1-4-2

A subband CSI-RS transmitter may also be considered to increase the multiplexing capability of the CSI-RS (i.e., case 1-2 and case 1-4). In order to support cases 1-2, 1-4-1 and 1-4-2, CSI reporting can be performed with limited specific subbands on the frequency axis.

In one embodiment, the serving base station measures the CSI in one subframe through higher layer signaling (e.g., radio resource control (RRC) signaling). At this time, the CSI reference resource can be included in one subframe.

If the CSI reference resource exists only in a specific subband, the serving BS can transmit downlink data by limiting the scheduling to the subband in which the CSI reference resource exists. At this time, all or a part of CSI-RS resource configuration information (for example, CSI-RS port number, NZP CSI-RS resource index, ZP CSI-RS resource index, CSI- Layer signaling or downlink control information (DCI).

If subband CSI-RS transmission is supported (i.e., case 1-2 and case 1-4), the subband CSI-RS resources may be allocated differently depending on the method of setting the subbands. That is, when the serving base station serves the first terminal and the second terminal, the serving base station transmits a subband including the CSI-RS to the first terminal through the subband setting method 1 or the subband setting method 2 described below You can tell. And the first terminal limits the range of CSI reference resources to the set subbands. At this time, the first terminal can generate the CSI report for the set subband separately from the CSI report generated using the periodic CSI-RS. The second UE performs rate matching on the PDSCH received from the serving BS and the enhanced physical downlink control channel (EPDCCH) in the CSI-RS resource.

Hereinafter, the subband setting method 1 and the subband setting method 2 will be described in detail with reference to FIG. 2 to FIG.

2 is a flowchart illustrating a method of setting a subband according to an embodiment of the present invention.

In the subband setting method (hereinafter referred to as "method 1") according to one embodiment (corresponding to cases 1-2 and 1-4-1), the index of a subband to which a CSI- May be established through radio resource control (RRC) signaling. At this time, the subband index. The CSI-RS subframe period, and the CSI-RS subframe offset, the CSI-RS configuration parameters may be transmitted through the upper layer signaling. That is, when the CSI-RS resource is set, the information on the RB pair including the CSI-RS RE can be transmitted to the UE through higher layer signaling.

In case of the method 1 in which the index of the subband to which the CSI-RS resource is allocated is transmitted to the UE through higher layer signaling, since the subband where the NZP CSI-RS resource is located does not change according to the time, And transmits information on the subbands in which the ZP CSI-RS resource is located to all the UEs existing in the cell. At this time, the terminal serving by the serving base station includes the first terminal and the second terminal. The first terminal receives the NZP CSI-RS and the second terminal does not receive the NZP CSI-RS. The second terminal includes a second terminal that receives the PDSCH, a third terminal that receives the EPDCCH, and other terminals. The second terminal and the third terminal can perform appropriate rate matching. The third UE receives the EPDCCH in a predetermined subframe through higher layer signaling and does not demodulate the PDCCH in the subframe receiving the EPDCCH. Therefore, the third terminal can not dynamically perform the rate matching of the EPDCCH.

Hereinafter, an EPDCCH rate matching method of the serving BS and the third UE will be described in detail.

Method B1: Regardless of the transmission of the NZP CSI-RS, the serving base station always performs rate matching in the RB to which the EPDCCH is transmitted.

Since the RB index to which the NZP CSI-RS is transmitted is known in advance in the method 1, the method B1 can be applied so that the third terminal can always assume the existence of the NZP CSI-RS in the indicated RB. At this time, even if the NZP CSI-RS is not transmitted, the serving BS performs rate matching for the EPDCCH, so that unnecessary rate matching may occur.

Method B2: Regardless of the transmission of the NZP CSI-RS, the serving base station does not perform rate matching in the RB to which the EPDCCH is transmitted.

Method B2 may be applied to solve the disadvantages of Method B1. The serving base station does not transmit the NZP CSI-RS in the RB to which the EPDCCH is transmitted. According to the LTE standard, since the serving base station does not transmit the EPDCCH and PDSCH in one RB, the first terminal does not need to estimate the channel for the corresponding RB, nor does the second terminal need to perform rate matching. The CSI reference resource used by the first UE may be allocated to the remaining RBs except for the RB allocated EPDCCH in the set S subband.

In the following, the allocation method of ZP CSI-RS is explained in detail.

When a serving base station transmits NZP CSI-RS through a plurality of subband NZP CSI-RS resources (i.e., when NZP CSI-RS is transmitted using a plurality of subbands), ZP CSI-RS Resources should be allocated. Methods 1-1 and 1-2 will be described to reduce the overhead of upper layer signaling that may occur at this time.

Method 1-1: ZP CSI-RS resources are set for the wide band. Case 1-2 is the same as the ZP CSI-RS resource setting of the LTE standard. In cases 1-4-1, the wideband ZP CSI-RS resources are set via upper layer signaling. At this time, the ZP CSI-RS resource is triggered using the DL grant allocating the PDSCH to the UE, so that the UE can be notified that the ZP CSI-RS resource is transmitted in the wide band. Therefore, the UE can know that the ZP CSI-RS resource exists in the RB in which the PDSCH exists.

Method 1-2: ZP CSI-RS resources are set for all subbands containing NZP CSI-RS resources. RE can be conserved because the UE may not mutate subbands that do not include subband NZP CSI-RS resources. In case 1-2 (periodic subband CSI-RS transmission), the base station sets ZP CSI-RS resources for all subbands to which the NZP CSI-RS can be transmitted, and sets the ZP CSI- And notifies the terminal through signaling. In Case 1-4-1 (non-periodic subband CSI-RS transmission), the base station sets the ZP CSI-RS resource for all subbands to which the NZP CSI-RS resource can be allocated, and sets the ZP CSI- To the terminal through higher layer signaling. Then, the ZP CSI-RS resource is triggered using the DL grant for assigning the PDSCH to the UE, so that the UE can be notified that the ZP CSI-RS is transmitted in the subband. Therefore, the UE can know that the ZP CSI-RS resource exists in the RB in which the PDSCH exists.

In the following, the PDSCH rate matching method will be described in detail. Methods A1 and A2 below are for instructing rate matching to the second terminal. At this time, the NZP CSI-RS can be transmitted in the DL sub-frame n-m (a sub-frame m earlier than the sub-frame n).

3 is a flow chart illustrating a first rate matching method in accordance with one embodiment.

The presence of the NZP CSI-RS in method A1 is indicated to the first terminal and the second terminal. In step S301, the serving BS transmits information on the subbands to which the NZP CSI-RS is allocated through the upper layer signaling to the first terminal and the second terminal. When the method B 1 is applied to the third UE, the serving BS transmits information on the sub-band to which the NZP CSI-RS is allocated through the upper layer signaling (S 301 - 1). The information on the subbands to which the NZP CSI-RS is allocated includes the indexes of the subbands to which the NZP CSI-RS is allocated.

In order to transmit the NZP CSI-RS, the serving base station notifies the first terminal and the second terminal of transmission of the NZP CSI-RS through the DL grant in the DL subframe n-k (S302). At this time, the transmission notice of the NZP CSI-RS can be transmitted through the DCI transmitted from the serving base station in a cell-specific search space. For example, one bit may be added to the DCI format 1C for the NZP CSI-RS's transmission notice.

Meanwhile, the second UE receives the PDSCH scheduling information in the DL sub-frame n-m through the DCI transmitted in the UE-specific search space of the serving BS (S303). That is, the second terminal receives two DL grants in the same subframe, where the two DL grants include a DL grant including DCI for transmission of the NZP CSI-RS and a DL grant including PDSCH scheduling information for rate matching Includes a grant.

On the other hand, the third terminal does not need to receive the DCI including the transmission notice of the NZP CSI-RS. Thereafter, the NZP CSI-RS is transmitted in the DL sub-frame n-m (S304), where m = k.

The serving base station transmits an UL grant so that the first terminal can transmit the CSI report in the UL subframe n (S305). Then, the first terminal generates a CSI report based on the received NZP CSI-RS (S306). At this time, the UL grant is transmitted in the DL sub-frame n-j, includes the CSI trigger for the CSI report, and the first terminal includes information on the PUSCH resource to be used for the CSI report. In the LTE FDD, j = 4, and in the LTE TDD, it has the j value defined by the standard. The first UE performs the CSI report using the PUSCH in the UL subframe n according to the UL grant (S307).

The second UE performs the PDSCH rate matching in consideration of the location of the RE used by the NZP CSI-RS in the DL sub-frame n-m (S308). The second terminal corresponds to the method 1-2 because the PDSCH rate matching is performed only in a specific subband.

When the method B 1 is applied to the third UE, the third UE does not receive the DCI indicating the transmission of the NZP CSI-RS, and the UE notifies the Node B of the NZP CSI- EPDCCH rate matching is performed. When the method B2 is applied, the third terminal does not perform separate rate matching (S309).

4 is a flow chart illustrating a second rate matching method according to one embodiment.

In the method A2, the presence of the NZP CSI-RS is transmitted to the first terminal and not to the second terminal. The PDSCH RE mapping and quasi-co-location indicator (PQI) field may be used for the second UE.

In step S401-1, the serving BS transmits information on the subband to which the NZP CSI-RS is allocated through the upper layer signaling to the first terminal.

In step S401-2, the serving BS sets the value of the PQI field in consideration of the location of the NZP CSI-RS resource through the upper layer signaling for the second terminal. The RRC parameters related to the PQI field and the PQI field conform to the LTE standard. When the PQI field is used, the second UE corresponds to the method 1-1 because the rate matching of the PDSCH is performed differently for each RB, and rate matching is performed for all the RBs to which the PDSCH is allocated in the same manner.

When the method B 1 is applied to the third UE, the serving BS transmits information about the sub-band to which the NZP CSI-RS is allocated through the upper layer signaling (S 401 - 3). At this time, the information on the subbands to which the NZP CSI-RS is allocated includes the indexes of the subbands to which the NZP CSI-RS is allocated.

In order to transmit the NZP CSI-RS, the serving base station notifies the first terminal of transmission of the NZP CSI-RS through the DL grant of the DL subframe n-k (S402). The transmission notice of the NZP CSI-RS may be DCI transmitted by the serving BS in the UE-specific search space. For example, one bit may be added to the DCI format 1 / 1A / 1B / 1C / 1D / 2A / 2B / 2C / 2D. In addition, the second UE receives the PDSCH scheduling information in the DL sub-frame n-m through the DCI transmitted in the UE-specific search space of the serving BS (S403). The DL grant received by the second terminal and including the PDSCH scheduling information is for rate matching. On the other hand, the third terminal need not receive such DCI.

Thereafter, the NZP CSI-RS is transmitted in the DL sub-frame n-m, and m = k (S404). The serving BS transmits an UL grant so that the first terminal can perform CSI reporting in the UL subframe n (S405). The first terminal receives the NZP CSI-RS and generates a CSI report (S406). At this time, the UL grant is transmitted in the DL sub-frame n-j, includes the CSI trigger, and the first terminal includes information on the PUSCH resource to be used in the CSI report. For LTE FDD, j = 4 and for LTE TDD the specification is followed. The first UE performs the CSI report using the PUSCH in the UL subframe n according to the UL grant (S407).

The second UE performs rate matching using the DL grant's PQI field and PDSCH scheduling information in the DL sub-frame n-m (S408). The second UE can perform the PDSCH rate matching regardless of the location of the NZP CSI-RS resource because the second UE can find the REs in which the PDSCH is located according to the PQI field.

If the method B 1 is applied to the third UE, the third UE does not receive the DCI notifying the transmission of the NZP CSI-RS, and transmits the EPDCCH Rate matching is performed (S409). When Method B2 is applied, the third terminal does not perform a separate rate matching.

Method A1 and method A2 in a first terminal. The description of the second terminal and the third terminal is discriminated, but the serving base station can set one of the operations of the first terminal, the second terminal, and the third terminal to one terminal.

In method A1 and method A2, DL grant transmitted in DL sub-frame n-k and UL grant transmitted in DL sub-frame n-j are distinguished, but DL grant and UL grant can be processed in one UL grant. That is, it is a way to operate without a DL grant. In this case, the serving BS uses the UL grant in the DL sub-frame n-j to instruct the first UE to trigger the CSI report. At this time, the CSI report trigger interpreted by the first terminal is that the serving base station will transmit the pre-established CSI-RS resource through the upper layer signaling, and the terminal must receive the CSI-RS to generate the CSI report. The CSI report trigger can also instruct the terminal to use the PUSCH, which is included in the UL grant, to allocate CSI report resources. The second UEs can not apply the method A1 because there is no DL grant and apply the method A2 to perform the PDSCH rate matching according to the PQI field value received from the serving BS.

5 is a flowchart illustrating a method of setting a subband according to another embodiment.

In the subband setting method according to another embodiment (hereinafter referred to as "method 2") (corresponding to cases 1-4-2), the index of the subband to which the CSI-RS resource is allocated is transmitted to the physical layer signaling (S501). In this case, the CSI-RS configuration parameters other than the subband index may be transmitted through upper layer signaling (S502). At this time, the CSI-RS configuration parameter transmitted through the higher layer signaling does not include at least the CSI-RS period and the CSI-RS subframe offset.

Method 2 performs the same procedure as Method 1, except that the information included in the DL grant or DCI for transmitting the CSI-RS is different.

In the method 2, the information on the subband through which the CSI-RS is transmitted may be transmitted to the UE using the DCI (S503). In the case 1-4-1, the information on the subbands through which the CSI-RS is transmitted is transmitted to the UE through the upper layer, and information on the subbands through which the CSI- And can be delivered to the terminal through the configuration. Since the required DCI format is not supported by the LTE standard, a new DCI format may be used or a separate DCI field may be added to the DCI format supported by the existing LTE standard. The added information includes at least CSI-RS RE subbands through the new DCI field. The new DCI format is mapped to a UE-specific search space.

A bitmap can be used to indicate the subband over which the NZP CSI-RS is transmitted via the DCI. For example, the bitmap may correspond to an RB index including CSI-RS. Alternatively, the bitmap may correspond to the subband definition defined in the CSI reporting mode set by the serving base station to the terminal performing the CSI reporting. If more bits are allocated per RB, more combinations of RBs can be represented using more DCI payloads. Therefore, the bit is more economical when it is allocated for each subband instead of the RB.

The definitions of the first terminal, the second terminal, and the third terminal used in method 2 are the same as those in method 1. The first terminal receives the NZP CSI-RS (S504) and performs the CSI report (S505, S506). The second terminal performs the PDSCH rate matching in consideration of the NZP CSI-RS without performing the CSI report, The third terminal does not perform the EPDCCH rate matching without performing the CSI report (method B1) or does not perform the EPDCCH rate matching (method B2). Method B1 and Method B2 can be applied equally to Method 2 as in Method 1. [

The EPDCCH rate matching is the same as Method 2 and Method 1. The serving BS may perform upper layer signaling to the first terminal and the second terminal (method B2) so that the subband transmitting the CSI-RS does not overlap with the RB transmitting the EPDCCH, or the subband transmitting the CSI-RS transmits the EPDCCH Layer signaling to the third UE so that rate matching can be performed in advance in all RBs that can overlap with the RB that is overlapped with the RB (method B1).

PDSCH rate matching is the same as Method 2 and Method 1. The second UE of the method 2 performs the PDSCH rate matching by applying the DCI field described above. Method 1-1 relates to PDSCH rate matching across wide bands, and Method 1-2 relates to PDSCH rate matching across subbands. In the method 2, the information about the sub-band of the ZP CSI-RS set by the serving BS to the second UE may be received by the second UE through the DCI. In method 1, information on the subbands of the ZP CSI-RS can be known in advance, but whether or not the ZP CSI-RS is transmitted can be known through the DCI.

FIG. 6 is a flowchart illustrating a first rate matching method according to another embodiment, and FIG. 7 is a flowchart illustrating a second rate matching method according to another embodiment.

Method 2 and Method 1-2 are applied to the first rate matching method according to another embodiment, and Method 2 and Method 1-1 are applied to the second rate matching method according to another embodiment.

6, a first terminal transmitting a CSI report to a serving base station, a second terminal receiving a PDSCH from a serving base station, and a third terminal receiving an EPDCCH from a serving base station are considered. The first terminal and the second terminal receive the setting for the NZP CSI-RS resource through the upper layer signaling (S601-1). At this time, the information on the subband to which the NZP CSI-RS resource is allocated is not transmitted through the upper layer signaling. The first terminal and the second terminal are allocated information (for example, a subband index) about a subband to which an NZP CSI-RS resource is allocated through a DL grant in a subsequent procedure. The third UE to which the method B1 is applied receives the index of a subband to which the NZP CSI-RS resource is allocated for the EPDCCH rate matching through the upper layer signaling (S601-2).

Then, the first terminal and the second terminal receive the DL grant including the subband index of the NZP CSI-RS (S602). The first UE confirms the NZP CSI-RS resource to be used for generating the CSI report from the received DL grant. The second UE confirms a subband to be used for PDSCH rate matching from the received DL grant. Then, the second terminal receives another DL grant (S603). At this time, a separate DL grant received by the second UE includes scheduling information of the PDSCH. Thereafter, the second UE performs PDSCH rate matching in the subband identified in step S602, and does not perform PDSCH rate matching in the other subbands (step S608).

The remaining steps of FIG. 6 correspond to the steps of FIG. That is, S603, S604, S605, S606, S607 and S609 in Fig. 6 are the same as S303, S304, S305, S306, S307 and S309 in Fig.

7, a first terminal that transmits a CSI report to a serving base station, a second terminal that receives a PDSCH from a serving base station, and a third terminal that receives an EPDCCH from a serving base station are considered. The first UE receives the setting of the NZP CSI-RS resource through the upper layer signaling (S701-1). At this time, the information on the subband to which the NZP CSI-RS resource is allocated is not transmitted through the upper layer signaling. The first terminal may receive information about the subband through the DL grant.

The second UE receives the setting related to the PQI field in which the location of the NZP CSI-RS resource is considered through the upper layer signaling (S701-2). The third terminal to which the method B1 is applied receives the index of the subband to which the NZP CSI-RS resource is allocated for the EPDCCH rate matching through the upper layer signaling (S701-3).

Thereafter, the first terminal receives a DL grant including an index of a subband to which the NZP CSI-RS resource is allocated (S702). The first UE confirms the NZP CSI-RS resource to be used for generating the CSI report based on the received DL grant. The second terminal receives the DL grant different from the DL grant of the first terminal (S703), and performs PDSCH rate matching based on the PQI field included in the DL grant (S708). The second UE can recognize the RE in which the PDSCH is located according to the PQI field, and thus can perform the PDSCH rate matching regardless of the location of the NZP CSI-RS resource.

The remaining steps of FIG. 7 correspond to FIG. That is, S704, S705, S706, S707, and S709 are the same as S404, S405, S406, S407, and S409.

On the other hand, a method of setting a plurality of subbands can be applied to both method 1 and method 2, and other means other than bitmaps can be used. (E.g., 3, 7, 11, ...), a subband start index and a spacing are indicated by an indication (e.g., 3 , 4). A subband start index and a size (length) may be indicated (for example, 10, 4) when a plurality of consecutive subbands are set (for example, 10, 11, 12 and 13). A subband cluster size (for example, 4, 5, 6, 16, 17, and 18) when a cluster is composed of a plurality of consecutive subbands and a plurality of clusters are set discontinuously (E.g., subband cluster length), subband start index, and spacing can be indicated (e.g., 3, 4, 12).

The RE mapping and sequence initialization of the subband CSI-RS can follow the CSI-RS resource allocation method of the conventional LTE system. For example, a CSI-RS sequence is generated to initialize a sequence of a subband CSI-RS, and a sequence element corresponding to the RB is mapped to a CSI-RS RE. If the CSI-RS is set on a subband basis, the middle part of the CSI-RS sequence may be mapped to RE. For example, if the RB index i belongs to a subband, the 2 nd and 2i + 1 th elements of the sequence are mapped to the i th RB. When a mobile station transmits a CSI report according to a CSI request, the mobile station transmits a subband CQI and a subband PMI to the serving base station in a PUSCH according to a CSI reporting mode. At this time, the UE performs channel coding on the RI, CQI, and PMI derived for each subband, and maps the RI, CQI, and PMI to the RE of the PUSCH.

When the UE calculates the wideband CQI, the wideband PMI, or the RI in any PUSCH CSI reporting mode, the UE calculates the CQI and PMI in the RB or subband including the NZP / ZP CSI-RS resource. Also, when the UE calculates the subband CQI or the subband PMI in an arbitrary PUSCH CSI reporting mode, the UE calculates the subband CQI and the subband PMI in the indicated subband. At this time, the UE is considered to be able to utilize the CSI-RS only in the indicated subband. In other words, the serving base station can minimize unnecessary CSI-RS transmission by transmitting the CSI-RS only in the designated subband to the terminal, and can reduce the interference to other terminals.

After the subband CSI report is reset via upper E-layer signaling or DCI, the terminal uses only one DL subframe in the indicated subband to generate a signal part, an interference part, and a noise part noise part, and does not re-use the results measured previously by periodic CSI-RS. This may be applicable even if the serving BS does not set the measurement restriction function to the UE through the upper layer signaling.

The subband CSI-RS resources are not dropped unless the RBs are overlapped even in a subframe in which a system information block (SIB) is transmitted.

The serving base station separately sets non-periodic CSI-RS transmission and periodic CSI-RS transmission to the UE through higher layer signaling. Therefore, the CSI process count due to aperiodic CSI-RS is not included in the number of CSI processes defined in the conventional LTE standard. Also, the CSI report mode due to the aperiodic CSI-RS may be set to one of the aperiodic CSI reporting modes supported by the conventional LTE standard, in accordance with the upper layer signaling of the serving base station.

The serving base station does not require a CSI trigger for periodic CSI-RS and a CSI trigger for aperiodic CSI-RS in the same UL subframe.

FIG. 8 is a flowchart illustrating a method of generating a CSI report based on a CSI-RS resource pool according to an embodiment.

According to an embodiment, the serving BS can set a CSI-RS resource pool including a plurality of NZP CSI-RS resources and ZP CSI-RS resources to the MS (S801). Then, the serving BS instructs the UEs with the NZP CSI-RS resource and the ZP CSI-RS resource using a separate DCI. At this time, the contents required for indicating NZP CSI-RS resources and ZP CSI-RS resources include subband NZP CSI-RS resources and subband NP CSI-RS resources limited to specific subbands. The CSI-RS port number, p-C, and CSI-RS sequence seed are transmitted to the UE through higher layer signaling. The terminal limits the CSI reference resource to the indicated subbands and generates a CSI report based on the NZP CSI-RS received in the indicated subband. At this time, the DCI used by the serving BS may include at least one of a CSI report trigger, an RB allocation or subband index used as a CSI reference resource, an NZP CSI-RS resource index, or a ZP CSI-RS resource index . The CSI report can be generated based on the CSI-RS resource pool. When a CSI-RS resource pool is set, signaling to the terminal is additionally required. CSI-RS resource pools can be defined in wideband or subband. The terminal assumes that the CSI-RS resource pool is periodically located within a wideband or subband.

First, the serving base station sets up a CSI-RS resource pool including all NZP CSI-RS resources and ZP CSI-RS resources that can be potentially allocated to the UE through higher layer signaling. In step S802, the serving base station transmits information on RB or subband allocation of NZP / ZP CSI-RS resources, NZP / ZP CSI-RS resource index, and CSI-RS port number to the UE through the DCI. The UE does not perform the CSI measurement if the DCI is not received after the CSI-RS resource pool is set up. Therefore, after the CSI-RS resource pool is set, the terminal performs the PDSCH rate matching on the assumption that the PDSCH is not included in the RE included in the CSI-RS resource pool (S803, S804).

According to one embodiment, a serving base station to which vertical beamforming (EBF) of an LTE system is applied may apply antenna virtualization differently for each subband, and may instruct a terminal to perform CSI report for each subband have. At this time, the serving base station can instruct an antenna virtualization change or a beamforming change through dynamic signaling. When the serving base station changes the antenna virtualization according to the rules defined by the LTE standard, explicit signaling to the terminal is unnecessary because the terminal knows the antenna virtualization change.

The serving base station conveys information about the CSI-RS and channel state information-interference measurement (CSI-IM) for which the antenna virtualization is valid. In this case, information transmitted to the UE includes an interference measurement time interval, a signal measurement time interval, an interference measurement subband, and a signal measurement subband. . The signal measurement time interval and the interference measurement time interval may be defined through upper layer signaling of the serving base station as in the measurement limitation of the LTE standard, or may be predetermined in regulation. For the subband restriction, the serving base station transmits information (for example, a continuous RB or discontinuous RB) about the subbands for which CSI-RS and CSI-IM are valid (for example, RB or discontinuous RB) to the UE through upper layer signaling or DCI . An interference measurement window can then be adjusted via higher layer signaling or DCI. The RB used by the UE through the interference measurement window may be limited, and the information on the interference measurement window may include the number of subframes and the number of RBs.

In one embodiment, the serving BS indicates the subband on which the CSI report is transmitted to the UE through higher layer signaling, and the UE assumes that the CSI-RS is transmitted only in the indicated subband. The base station can inform the terminal of the PUSCH resource configuration through the DCI. At this time, the existing DCI format 0 and the DCI format 4 can be reused.

Hereinafter, a method of transmitting the beamformed CSI-RS based on the EBF will be described.

A base station that transmits beamformed CSI-RS based on EBF can use multiple beamformed CSI-RS resources. At this time, one or a plurality of CSI-RS resources may be included in one subframe. The base station sets up a single CSI process for the entire beamformed CSI-RS, and the terminal can select one of the CSI-RS resources to generate one CSI feedback. Or the base station may establish a CSI process for each CSI-RS resource.

As described above, antenna virtualization may vary for each subband. Also, RI, PMI, and CQI may be different for each subband, and quasi-colocation may be different. For example, the Doppler frequency may be measured differently for the UE depending on the steering angle of the beamformed CSI-RS.

At this time, the wide band CSI commonly applied to all subbands is not fed back to the base station. Specifically, the UE can derive an RI, a wide band PMI, and a wide band CQI for each subband corresponding to the same CSI-RS resource index. However, since the subband PMI, the subband CQI, and the subband RI are applied to the scheduling, information on the wide band is not required. Therefore, in this case, the UE performs differential encoding based on CSI derived from a specific subband (for example, the first subband index applied to the same virtualization or the first subband index not related to virtualization) The amount of feedback can be reduced.

On the other hand, the UE can measure a high CQI from one of different beamforming CSI-RS resources transmitted by the base station for each subband. At this time, the mobile station feedbacks the preferred beam index and CSI determined for each subband to the base station, and the serving base station can perform scheduling based on the fed back preferred beam index and CSI. The serving BS may request the UE with separate CSI feedback (RI, CQI, PMI) for the set of the requested subband with the same CSI-RS resource index.

FIG. 9 is a flowchart illustrating a hybrid CSI-RS transmission method according to an embodiment.

In a hybrid CSI-RS transmission scheme, a UE receives a CSI-RS transmitted in two stages. In step 1, the UE periodically receives wideband CSI-RS resources from the serving base station (S910). Then, the serving base station transmits CSI-RS resources. The UE periodically receives the CSI-RS (S911) and periodically feeds back the CSI (e.g., PMI, RI, CQI) or the CSI according to the request of the serving base station (S912). At this time, the serving base station can derive suitable precoding for each terminal that transmitted feedback based on CSI-RS feedback by the first stage CSI-RS transmission for each subband. In order to reduce the amount of CSI feedback, the UE may transmit the subband index, the PMI calculated in each subband, and the RI calculated in the wide band to the serving BS, except for the CQI. In a practical implementation, the subband index may be determined by the serving base station and may be determined, for example, as a subband that obtains a CQI above a predetermined level. If UE-selected CSI reporting mode is set, the UE can only feed back PMI and RI or PMI without CQI.

In step 2, the UE receives a CSI-RS from a serving BS in a specific subband (S930). In order to reduce the overhead of the CSI-RS transmission, the serving base station can transmit the CSI-RS only in the subband selected from the one-stage feedback without using all the subbands. The beamforming weight used at this time can be determined through a UL measurement result based on the UL SRS or the like if the feedback provided in the first step is available. In step S920, the serving BS may set the subband index to which the subband CSI-RS is transmitted to the MS in upper layer signaling or DCI. In this case, the CSI-RS resource index received by the terminal in step 2 may be the same as or different from the CSI-RS resource index received in step 1, and the number of CSI-RS ports may be the same as or different from the first step have. The UE receives the CSI-RS aperiodically (S931) and feeds back the CSI (S932).

10 is a flowchart illustrating a method of generating a CSI report for a PMU report according to an exemplary embodiment of the present invention.

According to one embodiment, the serving BS instructs the terminal to send a legacy CSI report (S1001) and a CSI report (including RI, PMI, CQI, etc.) to a specific subband (S1002) . At this time, a CSI-RS port number, a p-C, and a CSI-RS sequence seed may be transmitted to the UE through higher layer signaling. The subband through which the CSI-RS is transmitted may be indicated to the UE using higher layer signaling or DCI. Assigning subbands through higher layer signaling and assigning subbands via DCI follows the method described above.

The serving base station instructs the terminal to use the DL grant and the UL grant or only the UL grant (S1003). When a subband is allocated through the DCI, the UE recognizes the aperiodic CSI-RS transmission from the UL grant, knows the subband on which the CSI-RS is transmitted, and knows the location of the PUSCH resource to transmit the CSI report. When a subband is allocated through upper layer signaling, the UE recognizes the aperiodic CSI-RS transmission and can know the location of the PUSCH resource to transmit the CSI report.

On the other hand, the high discriminative PMI report can be used for more accurate acquisition of CSI in a specific subband for MU MIMO and can be utilized for MU pairing. At this time, a single user PMI codebook and an MU PMI codebook can be defined in advance. For example, when the SU PMI codebook is a oversampled Discrete Fourier Transform (DFT) codebook, the MU PMI codebook can be represented as a DFT codebook over-sampled by y (y> x) have. A plurality of PMI codebooks are set up through upper layer signaling, and the base station can request a CSI report to the terminal using a specific PMI codebook through the DCI. At this time, each PMI codebook is based on the DFT PMI codebook and can be expressed by the oversampling rate, the number of linear combinations, and the number of PMIs.

In the case where the number of CSI-RS ports for a specific subband is different from one another, in order for full power utilization, an energy per resource element (EPRE) as a pC is allocated to each subband Can be set differently. For example, when the CSI-RS 8 port is set for RB1 and the CSI-RS 4 port is set for RB2, and the PDSCH with the same precoding applied to RB1 and RB2 is transmitted, the UE judges PDSCH EPRE to be the same However, CSI-RS EPRE can be judged differently in each RB. For this purpose, the serving base station can use a separate DCI format. At this time, the required information may include an RB allocation or subband index used as a CSI reference resource, a PMI codebook indication (e.g., 1 bit), or a parameter set index for a codebook configuration (e.g., An oversampling rate, the number of linear combinations, etc.).

The MU CSI report is described below. In the MU CSI report for MU CSI, when the aperiodic CSI-RS is set in step S1002 and the CSI report is set, an MU CSI report can also be set.

The UE can transmit a plurality of PMIs and CQIs (MU CSI) to the serving BS for each subband as information for MU pairing. However, when the UE transmits MU CSI for each subband, the periodic CSI reporting mode using the PUCCH is not suitable because the CSI payload increases a lot. Therefore, the terminal uses the PUSCH to transmit the MU CSI, and a new PUSCH CSI reporting mode can be introduced if necessary.

The serving BS can instruct the UE through the DCI to report the MU CSI for the specific subband. At this time, MU CSI and SU CSI can be defined as separate bit fields, respectively. Alternatively, the serving base station may assign different codebooks for a particular subband to the terminal using higher layer signaling. In this case, the terminal generates CSI feedback by the number of codebooks constituted in the corresponding subband.

In one embodiment, the terminal assumes that the CSI-RS is transmitted only in a limited subband. The UE can generate a plurality of PMIs and CQIs for one subband. The PMI generated for each subband may be a precoder generated through a single user hypothesis or a precoder generated through a multiuser hypothesis. In a single user assumption, a mobile station assumes a PDSCH transmission from a serving base station to a mobile station itself. In a multi-user assumption, a mobile station UEs are simultaneously scheduled (MU pairing) PDSCH transmission. When a two-dimensional PMI codebook is used in a single user assumption, PMI vectors can be generated one for each vertical and horizontal axis, and one or more PMI matrices can be generated. The MU pairing considered in the multi-user assumption can be set up via higher layer signaling, or as defined in the specification, or can be set by limiting the combination defined in the specification through higher layer signaling. The multi-user assumption may include a plurality of MU pairings, and a one-dimensional PMI codebook or a two-dimensional PMI codebook may be applied for each MU pairing so that the terminal can calculate precoding.

The CQI derived from the subband can be derived one by one on the vertical and horizontal axes when a single user assumption is applied and a two-dimensional PMI codebook is applied. Or may be derived as a single CQI including both vertical and horizontal axis information. When a one-dimensional PMI codebook is applied, one CQI is derived. When a multi-user assumption is applied, a CQI is derived for each MU pairing, and the derived CQI may vary depending on whether the applied PMI codebook is one-dimensional or two-dimensional. When a one-dimensional PMI codebook is applied, the number of subband CQIs depends on the number of MU pairings. When a two-dimensional PMI codebook is applied, the number of subband CQIs is the number of MU pairings and the number of CQIs derived from the two- As shown in FIG.

To reduce CSI feedback, the terminal may not send feedback of a predetermined set of PMI (i.e., multiuser assumptions applied in the specification). In this case, the UE only feeds back the CQI. And one or two CQIs are generated for each PMI belonging to the PMI set. Also, since the differential CQI for the reference CQI is used as the CQI, the number of bits can be reduced. The reference CQI may be any CQI included in the MU CSI report. Alternatively, the reference CQI may be a CQI derived by the terminal in a wide band or a value determined through a functional operation (for example, an arithmetic average) of the subband CQI derived by the terminal in the subband.

11 is a block diagram illustrating a wireless communication system according to an embodiment.

Referring to FIG. 11, a wireless communication system according to an embodiment includes a base station 1110 and a terminal 1120.

The base station 1110 includes a processor 1111, a memory 1112, and a radio frequency unit (RF unit) 1113. The memory 1112 may be coupled to the processor 1111 to store various information for operating the processor 1111 or at least one program executed by the processor 1111. [ The wireless communication unit 1113 is connected to the processor 1111 to transmit and receive a wireless signal. The processor 1111 may implement the functions, processes, or methods proposed in the embodiments of the present disclosure. At this time, in the wireless communication system according to an embodiment of the present invention, the wireless interface protocol layer may be implemented by the processor 1111. [ The operation of base station 1110 in accordance with one embodiment may be implemented by processor 1111. [

The terminal 1120 includes a processor 1121, a memory 1122, and a wireless communication unit 1123. The memory 1122 may be coupled to the processor 1121 to store various information for driving the processor 1121 or at least one program to be executed by the processor 1121. [ The wireless communication unit 1123 is connected to the processor 1121 to transmit and receive a wireless signal. The processor 1121 may implement the functions, steps, or methods suggested in the embodiments of the present disclosure. At this time, in the wireless communication system according to an embodiment of the present invention, the wireless interface protocol layer can be implemented by the processor 1121. [ The operation of terminal 1120 according to one embodiment may be implemented by processor 1121. [

In an embodiment of the present disclosure, the memory may be located inside or outside the processor, and the memory may be connected to the processor through various means already known. The memory may be any type of volatile or nonvolatile storage medium, e.g., the memory may include read-only memory (ROM) or random access memory (RAM).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (19)

A method for a terminal to receive a reference signal (RS) from a base station,
Receiving a setup regarding a subband to which the reference signal is allocated through an upper layer signaling from the base station,
Receiving a sub-frame including reference signal resources allocated on a sub-band basis
Lt; / RTI >
Wherein the reference signal is one of a user equipment-reference signal (UE-RS) or a channel state information-reference signal (CSI-RS). The method of claim 1,
If the reference signal is the CSI-RS, the subband includes at least one zero power (ZP) CSI-RS resource and at least one non-zero power (NZP) CSI- , Respectively. 3. The method of claim 2,
Receiving information on the subband through the higher layer signaling
Further comprising:
And the information on the subband is an index of a subband to which the NZP CSI-RS is allocated. 3. The method of claim 2,
Receiving information on the sub-band through downlink control information (DCI)
Further comprising:
And the information on the subband is an index of a subband to which the NZP CSI-RS is allocated. 3. The method of claim 2,
Receiving an NZP CSI-RS from the NZP CSI-RS resource,
Generating a CSI report based on the NZP CSI-RS, and
Transmitting the CSI report to the BS using an uplink resource indicated through an uplink grant (UL grant)
Further comprising the steps of: The method of claim 5,
Wherein the uplink grant comprises a CSI trigger for the CSI report. 3. The method of claim 2,
Receiving a downlink grant (DL grant) including PDSCH scheduling for rate matching of a physical downlink shared channel (PDSCH)
Performing rate matching in consideration of a location of a resource element (RE) used by the NZP CSI-RS;
Further comprising the steps of: 3. The method of claim 2,
When the base station performs rate matching in a resource block (RB) in which an enhanced physical downlink control channel (EPDCCH) is transmitted, the base station performs rate matching on the EPDCCH based on the sub- Performing rate matching on
≪ / RTI > A rate matching method for a Physical Downlink Shared Channel (PDSCH) of a UE,
(PDSCH RE) mapping and quasi-co-location indicator (PQI) field in which a location of a reference signal (RS) resource is considered, And
Performing the rate matching based on the PQI field
/ RTI > The method of claim 9,
Wherein performing the rate matching comprises:
Performing rate matching on all resource blocks (RBs) to which the PDSCH is allocated
/ RTI > The method of claim 9,
Receiving a downlink grant (DL grant) including scheduling information for the PDSCH;
Further comprising:
Wherein performing the rate matching comprises:
Performing rate matching based on the scheduling information and the PQI field
/ RTI > At least one processor,
Memory, and
Wireless communication section
Lt; / RTI >
The at least one processor executing at least one program stored in the memory,
Receiving a setting relating to a subband to which a reference signal (RS) is allocated through an upper layer signaling from a base station,
Receiving a sub-frame including reference signal resources allocated on a sub-band basis
Lt; / RTI >
Wherein the reference signal is one of a user equipment-reference signal (UE-RS) or a channel state information-reference signal (CSI-RS). The method of claim 12,
If the reference signal is the CSI-RS, the subband includes at least one zero power (ZP) CSI-RS resource and at least one non-zero power (NZP) CSI- Respectively. The method of claim 13,
The at least one processor executing the at least one program,
Receiving information on the subband through the higher layer signaling
Lt; / RTI >
Wherein the information on the subband is an index of a subband allocated with the NZP CSI-RS. The method of claim 13,
The at least one processor executing the at least one program,
Receiving information on the sub-band through downlink control information (DCI)
Lt; / RTI >
Wherein the information on the subband is an index of a subband allocated with the NZP CSI-RS. The method of claim 13,
The at least one processor executing the at least one program,
Receiving an NZP CSI-RS from the NZP CSI-RS resource,
Generating a CSI report based on the NZP CSI-RS, and
Transmitting the CSI report to the BS using an uplink resource indicated through an uplink grant (UL grant)
. 17. The method of claim 16,
Wherein the uplink grant comprises a CSI trigger for the CSI report. The method of claim 13,
The at least one processor executing the at least one program,
Receiving a downlink grant (DL grant) including PDSCH scheduling for rate matching of a physical downlink shared channel (PDSCH)
Performing rate matching in consideration of a location of a resource element (RE) used by the NZP CSI-RS;
. The method of claim 13,
The at least one processor executing the at least one program,
When the base station performs rate matching in a resource block (RB) in which an enhanced physical downlink control channel (EPDCCH) is transmitted, the base station performs rate matching on the EPDCCH based on the sub- Performing rate matching on
.

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