KR20160055060A - Method and apparatus for generating CSI report - Google Patents

Abstract

An embodiment provides a method that is capable of generating CSI reports for a larger number of antenna ports. Provided are a method and a terminal that generate a CSI report via the steps of: receiving a CSI-RS via at least one CSI-RS resource included in a CSI-RS occasion from a base station of a serving cell; and generating a CSI report based on the CSI-RS received via the at least one CSI-RS resource.

Description

[0001] The present invention relates to a method and apparatus for generating a channel state information report,

The present disclosure relates to an apparatus and method for generating a channel state information report for a base station in a wireless communication system.

Rel-12 of the 3 ^rd generation partnership project (LTE) long term evolution defines eight channel state information-reference signal (CSI-RS) ports. The base station of the serving cell can allocate CSI-RS to each antenna port and receive a CSI report on the CSI-RS port from the terminal. At this time, a solution is needed to use more antenna ports (e.g., 16, 32 or 64) at the base station.

One embodiment provides a way to generate a CSI report for more antenna ports.

Another embodiment provides an apparatus that can generate CSI reports for more antenna ports.

According to one embodiment, a method of generating a channel state information report of a terminal is provided. The CSI report generation method includes receiving CSI-RS from at least one CSI-RS resource included in a channel state information-reference signal (CSI-RS) And generating a CSI report based on the CSI-RS received via at least one CSI-RS.

In the CSI report generation method, the CSI-RS operation may include at least one subframe.

The CSI report generation method may further include receiving configuration information for a CSI-RS allocation from a base station prior to the reception step.

In the CSI report generation method, the step of receiving the configuration information for the CSI-RS operation from the base station may include receiving the configuration information for the CSI-RS operation through the radio resource control signaling from the base station.

The setting information for the CSI-RS operation in the CSI report generation method includes at least one of period information of the CSI-RS, information of the subframe offset of the CSI-RS, or identifier list information of the CSI-RS resource .

In the CSI report generation method, the CSI-RS resource identifier list information includes information on the number of antenna ports for each CSI-RS resource included in at least one CSI-RS resource, information on the setting of at least one CSI- , Information on the relative sub-frame offset of at least one CSI-RS resource, or combination information of at least one CSI-RS resource.

The generating in the CSI report generation method may include generating a plurality of CSI reports for the CSI-RS.

The generating in the CSI report generation method may include generating a CSI report based on the combination information of the CSI-RS resources defined for the CSI-RS operation.

The CSI report generation method includes a step of receiving setting information of a ZP CSI-RS allocation related to a Zero Power (ZP) CSI-RS resource included in a CSI-RS allocation from a base station before a reception step And the setting information of the ZP CSI-RS accession may include information on the period of the ZP CSI-RS, information on the subframe offset of the ZP CSI-RS, information on the duration of the ZP CSI-RS, , Or an identifier list information of the ZP CSI-RS resource.

The CSI report generation method includes receiving CSI-IM allocation information (CSI-IM) information on channel state information-interference measurement (CSI-IM) resources included in a CSI- And the setting information of the CSI-IM operation may include information on the cycle information of the CSI-IM, information on the subframe offset of the CSI-IM, information on the duration of the CSI-IM, , Or an identifier list information of CSI-IM resources.

According to another embodiment, there is provided a system 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 to receive channel state information- Receiving a CSI-RS via at least one CSI-RS resource included in the CSI-RS, and generating a CSI report based on the CSI-RS received via the at least one CSI-RS.

The CSI-RS in the terminal may include at least one subframe.

The at least one processor in the terminal may further perform the step of receiving configuration information for the CSI-RS operation from the base station prior to performing the step of executing and receiving at least one program.

When at least one processor in the AT performs at least one program and performs the step of receiving configuration information for a CSI-RS operation from a base station, And receiving the setting information.

The setup information for the CSI-RS operation in the UE may include at least one of period information of the CSI-RS operation, subframe offset information of the CSI-RS operation, or identifier list information of the CSI-RS resource have.

The CSI-RS resource identifier list information in the UE includes information on the number of antenna ports for each CSI-RS resource included in at least one CSI-RS resource, information about setting of at least one CSI- , Information on the relative sub-frame offset of at least one CSI-RS resource, or combination information of at least one CSI-RS resource.

When performing at least one processor in the terminal by executing at least one program, the step of generating a plurality of CSI reports for the CSI-RS operation may be performed.

At the step of generating at least one program by executing at least one program in the AT, the step of generating a CSI report based on the combination information of the CSI-RS resources defined for the CSI-RS can do.

At least one processor in the terminal is configured to perform a ZP CSI-RS with respect to Zero Power (ZP) CSI-RS resources included in the CSI-RS allocation from the base station prior to the step of executing and receiving at least one program. And the setting information of the ZP CSI-RS operation is further performed by periodically informing the ZP CSI-RS accession period information, the ZP CSI-RS accession subframe offset information, and the ZP CSI-RS The duration information of the association, or the identifier list information of the ZP CSI-RS resource.

At least one processor in the UE may be configured to perform channel state information-interference measurement (CSI-IM) resources included in a CSI-RS allocation from a base station prior to the step of executing and receiving at least one program. IM operation, the setting information of the CSI-IM operation is further processed by the CSI-IM operation period information, the CSI-IM operation subframe offset information, the CSI- The duration information of the IM application, or the identifier list information of the CSI-IM resource.

A CSI report for a larger number of antenna ports can be generated using a CSI-RS operation including at least one subframe.

1 is a diagram illustrating a CSI-RS resource index.
FIG. 2 is a diagram illustrating a CSI-RS allocation according to an exemplary embodiment of the present invention.
3 is a diagram illustrating a CSI-RS accession according to another embodiment.
FIG. 4 is a diagram illustrating a csi-SubframePatternConfig-r10 parameter according to an exemplary embodiment.
FIG. 5 is a diagram illustrating a CSI-RS accession set in the same manner as a subframe set according to an embodiment.
FIG. 6 is a diagram illustrating a CSI-RS occasion configured concurrently with a CSI subframe set according to an embodiment.
7 is a diagram illustrating CSI-RS port indexing in a CSI-RS resource according to an embodiment.
8 is a diagram illustrating CSI-RS resources defined in multiple subframes according to an exemplary embodiment.
9 is a diagram illustrating CSI-RS resources defined in a single subframe according to an embodiment.
10 is a diagram illustrating CSI-RS resources defined in a single subframe according to another embodiment.
11 is a diagram illustrating CSI-RS resources defined in multiple subframes according to another embodiment.
12 is a diagram illustrating CSI-RS port numbering of a serving cell according to another embodiment.
13 is a diagram illustrating CSI-RS port numbering of a serving cell according to another embodiment.
14 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) A femto BS, a home Node B, a HNB, a pico BS, a macro BS, a micro BS, ), Etc., and may be all or part of an ABS, a Node B, an eNodeB, an AP, a RAS, a BTS, an MMR-BS, an RS, an RN, an ARS, It may include a negative feature.

1 is a diagram illustrating a CSI-RS resource index.

Referring to FIG. 1, CSI-RS resources may be set to five or less for eight antenna ports in one subframe. Arithmically, 40 resource elements (REs) in one physical resource block (PRB) pair can be allocated as CSI-RS resources. If the base station sets 16 or 32 antenna ports to the UE, the antenna port can be supported by only one PRB pair. However, if the base station has more than 40 antenna ports and the terminal has to estimate the channel for all antenna ports, it can not support in one PRB pair, so an antenna port support method for this case is needed.

In order to solve the above problem, two methods can be applied. First, a new CSI-RS resource pattern capable of multiplexing more CSI-RS ports in one subframe can be defined (method 1). Alternatively, the base station of the serving cell (hereinafter referred to as 'serving cell') transmits CSI-RS over several subframes, and the UE can receive the CSI-RS in a plurality of subframes (method 2).

Method 1 has the advantage of being able to generate a CSI report using only one CSI-RS subframe. However, when the number of transmission ports is 64 (64-Tx), since orthogonal frequency division multiplexing (OFDM) symbols that can be allocated to a control region are limited to two, There may be a limitation on the maximum multiplexing capacity of the physical downlink control channel (PDCCH). Also, in case of 64-Tx, since the CSI-RS received from the serving cell is allocated to the RE of the CSI-RS subframe, the UE can not receive the CSI-RS of the adjacent cell in the same subframe. In this case, when the UE receives a serving cell's CSI (Precoding Matrix Indicator (PMI) / Rank Indicator (RI) / Channel Quality Indicator (CQI) The accuracy of the two CSIs can vary because they are derived from different interference conditions. Thus, there is a problem that the CSI-RS multiplexing capability is reduced in a co-channel heterogeneous network (HetNet).

In one embodiment, a method 2 in which a CSI-RS is transmitted in a plurality of subframes is considered. According to an embodiment of the present invention, when the CSI-RS is transmitted over several subframes, problems with different interference conditions for each subframe can be solved.

According to one embodiment, a CSI-RS may be transmitted via a plurality of CSI-RS resources. At this time, the CSI-RS resource refers to a set of REs set to the UE by a single CSI-RS resource configuration.

Meanwhile, a small cell discovery signal (e.g., a discovery reference signal (DRS)) may be transmitted in the form of an occasion. In addition, a cell cluster-specific DRS operation is defined to be specific to a cell cluster, a discovery signal measurement timing configuration (DMTC) is set to the UE, Management, RRM) reports. At most one CSI-RS resource may be transmitted per cell in a subframe included in one DMTC.

According to one embodiment, a CSI-RS accession may be defined by a method in which a plurality of CSI-RS resources are transmitted in one cell, that is, a CSI-RS resource association method. The CSI-RS accession may be a set of at least one downlink subframe including at least one CSI-RS resource. The CSI-RS occasion may include the serving cell's CSI-RS resource (s) and may also include the neighboring cell's CSI-RS resource (s). Hereinafter, the CSI-RS operation will be described in detail with reference to FIG.

FIG. 2 is a diagram illustrating a CSI-RS allocation according to an exemplary embodiment of the present invention.

Referring to FIG. 2, a CSI-RS access according to an exemplary embodiment includes two subframes each including four CSI-RS resources and adjacent to each other. The duration of the CSI-RS occasion is 2 ms, and one CSI-RS resource has the same shape. Since the periodicity of the CSI-RS is 5 ms, the CSI-RS resources included in the CSI-RS can also be transmitted in a period of 5 ms. In FIG. 2, two subframes included in the CSI-RS accession are continuous. However, the CSI-RS accession according to another embodiment may include n subframes that are not continuous.

Configuration information for the CSI-RS accession may be directed to the terminal through Radio Resource Control (RRC) signaling. The RRC signaling including the setting information for one CSI-RS accession includes period information of the CSI-RS, subframe offset information of the CSI-RS, and identification of the CSI- , ID) list information. In this case, the ID list information of the CSI-RS resource includes information on the number of CSI-RS antenna ports for each CSI-RS resource ID, information on CSI-RS resource setting for each CSI-RS resource ID, Information about a relative sub-frame offset for the RS resource ID, and combining information for each CSI-RS resource ID. Relative sub-frame offset information for each CSI-RS resource ID and association information for each CSI-RS resource ID may exist only when necessary.

The CSI-RS period information may include CSI-RS periodicity values of 5, 10, 20, 40 and 80 ms. The signaling of the Rel-12 LTE standard can be reused in the number of CSI-RS antenna ports and CSI-RS resource setting for each CSI-RS resource ID. As a reference sub-frame for defining a relative sub-frame offset for each CSI-RS resource ID, for example, the most preceding sub-frame among the sub-frames constituting the CSI-RS allocation can be determined. At this time, the relative sub-frame offsets of different CSI-RS resource IDs may have the same value, and thus, a plurality of CSI-RS resources may be allocated to one subframe. Referring to FIG. 2, the CSI-RS allocation period is 5 ms, the CSI-RS accession duration is 2 ms, and the CSI-RS resource ID list is {0, 1, 2, 3}.

The binding information for each CSI-RS resource ID is necessary when the serving cell receives a plurality of CSI reports from the terminal. For example, when a serving cell having a two-dimensional uniform rectangular array (2D URA) establishes a crossed linear CSI-RS port allocation for the UE, RS may transmit a joint CSI report for all configured CSI-RS ports to the base station or one of a horizontal CSI report or a vertical CSI report for a linear CSI-RS port corresponding to one axis to the base station have. Alternatively, if the CSI-RS operation includes more than one CSI subframe set, the serving cell may request the terminal for a separate CSI report for each CSI subframe set. In this case, the serving cell requests two CSI reports from one CSI-RS resource ID list to the terminal. To this end, CSI-RS resources corresponding to a plurality of CSI reports can be designated by further transmitting the combining information to the UE through RRC signaling. If one CSI report is generated from one CSI-RS resource ID list, the UE utilizes all the CSI-RS resources included in the CSI-RS resource ID list, even though the combining information is not separately transmitted through RRC signaling. And generate a single CSI report.

Meanwhile, in order to reduce the overhead of RRC signaling, some parameters included in the RRC signaling may be omitted without being transmitted to the UE through separate signaling. For example, if the serving cell requires a single CSI report to the terminal, some parameters may be omitted in the RRC signaling. At this time, a default value for some parameters to be omitted may be predetermined. In the case of the CSI-RS occasion duration parameter, if the serving cell does not separately set a parameter for the duration of the CSI-RS accession to the terminal, the terminal transmits the CSI- The RS occasion duration can be assumed to be 1 (ie, the default value of the CSI-RS occasion parameter is '1'). If the CSI-RS occasion duration is '1', the initial set value of the relative subframe offset information may be assumed to be '0'. In this case, if the relative subframe offset parameter is not '0' Signaling can be performed. The association information for the CSI-RS resource combination that can be signaled to the UE may be assumed to be a value included in the CSI-RS resource ID list as an initial setting value. When the combining information is assumed to be a value included in the CSI-RS resource ID list, the serving cell can perform RRC signaling to the UE when the parameter for the combining information is not included in the CSI-RS resource ID list.

3 is a diagram illustrating a CSI-RS accession according to another embodiment.

Referring to FIG. 3, the CSI-RS operation includes three subframes and includes three CSI-RS resources. At this time, the ID list information of the CSI-RS resources included in the RRC signaling can be set as follows.

- CSI-RS resource ID list: {0, 1, 2}

- CSI-RS resource ID # 0:

Number of CSI-RS antenna ports: 8

CSI-RS resource setting: 0

Relative sub-frame offset: 0

- CSI-RS resource ID # 1:

Number of CSI-RS antenna ports: 4

CSI-RS resource setting: 1

Relative sub-frame offset: 0

- CSI-RS resource ID # 2:

Number of CSI-RS antenna ports: 8

Setting up CSI-RS resources: 2

Relative sub-frame offset: 2

At this time, since the relative subframe offset of the CSI-RS resource ID # 0 and the CSI-RS resource ID # 1 is set to '0', it can be omitted. However, since the relative subframe offset of the CSI-RS resource ID # 2 is set to '2', the serving cell transmits the relative subframe offset parameter to the UE through RRC signaling.

If the UE can not establish a CSI-RS assignment, the UE can detect one of the CSI-RS resources constituting the CSI-RS based on the existing CSI-RS setting scheme. And the serving cell can reuse existing CSI-RS settings.

The following describes an implicit CSI-RS resource aggregation method.

In the implicit CSI-RS resource aggregation method, two CSI-RS resources are defined in one subframe. When 16 or 12 CSI-RS ports are set in the UE, the UE can obtain CSI using two CSI-RS resources. The serving cell indicates a first CSI-RS resource index to the UE, and the first CSI-RS resource index has an 8-port or a 4-port. If the number of ports of the first CSI-RS resource is insufficient, the terminal can find the remaining CSI-RS ports in the second CSI-RS resource. The second CSI-RS resource index can be derived from the first CSI-RS resource index. And the serving cell does not indicate the second CSI-RS resource index to the UE.

If the first CSI-RS resource is an 8-port, the terminal interprets and derives the index according to the 8-port CSI-RS port allocation, and if the first CSI- Can interpret and derive indices according to the 4-port CSI-RS port allocation. If the second CSI-RS resource is 8-port, the terminal interprets and derives the index according to the 8-port CSI-RS port allocation. If the second CSI-RS resource is 4-port, The index can be interpreted and derived according to the CSI-RS port allocation.

In the implicit CSI-RS resource aggregation method, the first CSI-RS resource and the second CSI-RS resource may be located in the same OFDM symbol so that the terminal can measure the channel at the same time. Therefore, when an 8-port or more CSI-RS is set in the UE, an OFDM symbol index is allocated to the UE in a frequency division duplexing (FDD) system in the second slot and the third slot of the first slot, (Time Division Duplexing (TDD)) system, the first slot can be limited to 2, 3, 1 and 3. If two different CSI-RS resources located in different OFDM symbols are used for channel estimation of the UE, the interference condition may be different for each OFDM symbol index, so that the channel (i.e., CSI) may be different from each other, and the phase drift ) May have different demodulation performances depending on the implementation problems.

When the 12-port or 16-port is set in the terminal and the first CSI-RS resource index is set, the number of ports possessed by the first CSI-RS resource is predefined in the specification, or 8- Port (Assumption of Port 1) or 4-Port (Assumption of Port 2). For example, when the 16th port is set in the terminal and the port assumption method 1 is applied, one of 1, 2, and 3 may be set as the first CSI-RS resource index in the terminal. The second CSI-RS resource has the remaining eight ports and has an index other than the index of the first CSI-RS resource. The resource index pair that the UE can assume is expressed by Equation (1).

For example, if the terminal is set to 12 ports and the port assumption method 2 is applied, a value of 1, 2, 3, 6, 7, or 8 may be set as the first CSI-RS resource index. The second CSI-RS resource has the remaining 8 ports. The resource index pair that the UE can assume is expressed by Equation (2).

Port Assumption In methods 1-1 and 1-2, a UE searches for a CSI-RS resource having a lower subcarrier index in a resource block (RB). Port Assumption In methods 1-2 and 2-2, the terminal finds a CSI-RS resource having a higher subcarrier index adjacent in the RB.

Hereinafter, a method in which a terminal generates a CSI report for a CSI-RS accession set by a base station will be described.

The terminal can generate one CSI report for one CSI-RS or generate a plurality of CSI reports.

First, a description will be given of a method in which a terminal generates one CSI report for one CSI-RS accession (CSI report generation method 1). For example, when using a 2-dimensional Active Antenna System (2D AAS) in a serving cell, a UE may send a cooperative CSI report from a plurality of CSI-RS resources through a CSI-RS resource combination Can be generated. The generated collaborative CSI report can collectively reflect horizontal CSI and vertical CSI.

A method in which the next UE generates a plurality of CSI reports for one CSI-RS is described (CSI report generation method 2). In the case where only a terminal (e.g., a terminal of a Rel-13 LTE system) capable of setting a CSI-RS access to a serving cell exists, the cooperative CSI report informs the terminal of a Rel-13 transmission mode And may be utilized when transmitting a physical downlink shared channel (PDSCH). In this case, the serving cell transmits the binding information to the UE through RRC signaling. If the serving cell establishes the Rel-12 TM to the Rel-13 UE, the serving cell may set only the horizontal CSI-RS port to the UE and receive the CSI report accordingly. However, when the Rel-13 UE and the Rel-12 UE are mixed in the serving cell, the serving cell may perform multi-user pairing (MU pairing) of the Rel-13 UE and the Rel-12 UE Can be considered. For this, the Rel-13 terminal can also generate a Rel-12 CSI report separately from the Rel-13 CSI report and deliver it to the serving cell.

In addition, the serving cell performs signaling to the Rel-13 UE so that the Rel-13 UE can generate a plurality of CSI reports for one CSI-RS resource combination. The Rel-13 terminal can then generate Rel-12 CSI reports (ie, horizontal CSI reports) generated using the Rel-13 CSI reports generated using all CSI-RS ports and some CSI-RS ports .

There are two methods for CSI report generation method 2 as follows. When a plurality of CSI reports are generated for one CSI-RS accession, a CSI report is generated for each CSI-RS resource for one CSI-RS accession (CSI report generation method 2-1) The CSI-RS resource combination can be defined for the CSI-RS operation and the CSI report can be generated in the CSI-RS resource subset unit (CSI report generation method 2-2). At this time, for the same CSI-RS resource transmission, the serving cell can additionally perform RRC signaling on the combination information of the CSI-RS resource combination to the UE.

In the case of CSI report generation methods 1 and 2-2, the UE can generate a CSI report for each associated CSI-RS resource. In the CSI report generation method 1, the combined CSI-RS resources are the sum of all the CSI-RS resources constituting the CSI-RS allocation. Also, in CSI report generation method 2-2, each combined CSI-RS resource is the sum of CSI-RS resources. Since the noise and the interference may be different for each CSI-RS resource constituting each combined CSI-RS resource, the UE considers all the CSI-RS resources belonging to the combined CSI-RS resources A CSI (Precoding Matrix Indicator (PMI) / Rank Indicator (RI) / Channel Quality Indicator (CQI)) report can be generated. In addition, the UE may transmit a CSI reference resource (e.g., a Cell Specific Reference Signal (CRS) overhead, a Demodulation Reference Signal , Assuming that the assumption (ie, the CSI reference resource assumption) for the DMRS overhead, the PDSCH TM, and the reference signal energy per resource element (RS EPRE) .

Each parameter set indicated by the Physical Downlink Shared Channel Mapping and Quasi-Coordinated Indicator (PQI) field of the downlink control information (DCI) format 2D is a PDSCH (Non-zero-power, NZP) CSI-RS ID ('qcl-CSI-RS-ConfigNZPId-r11') to determine the quasi co-location (QCL) . One NZP CSI-RS ID corresponds to one CSI-RS resource. The RRC parameter 'CSI-RS-ConfigNZP-r11' for setting the CSI-RS resource may include setting information of the CRS in the QCL relationship with the corresponding CSI-RS resource in addition to the CSI-RS resource setting information. When a CSI subframe set is set up in the UE, the UE can classify the CSI-RS accesses belonging to each CSI subframe set and assume a CSI reference resource.

In the following, the CSI subframe set will be described in detail.

In a co-channel HetNet scenario or a co-channel small cell scenario, a time domain interference coordination is performed to reduce an inter-cell interference effect, (E. G., Enhanced Inter-Cell Interference Coordination (eICIC)) may be performed. When the eICIC is performed in the serving cell set as the primary cell (PCell) for the UE, the serving cell introduces an ABS (almost blank subframe) and performs different CSI reports and RRM measurements in the ABS and the non-ABS can do. The serving cell can instruct the terminal with an ABS pattern by RRC signaling. At this time, the ABS pattern is a bitmap having a length of 40 in the case of FDD, and a bitmap having a length of 20/40/70 in the case of TDD according to a subframe configuration. The terminal can generate a CSI report by dividing the CSI subframe set into two.

In the case of setting up a CSI subframe set in a serving cell, a method in which a CSI-RS allocation and a CSI subframe set coexist with each other according to an embodiment is a method in which a CSI-RS allocation is a subset of a CSI subframe set Method (coexistence method 1) and a method in which the CSI-RS operation and the CSI subframe set partially overlap (coexistence method 2). The case where the CSI-RS operation includes the CSI subframe set is equivalent to coexistence method 2.

First, in coexistence method 1, one CSI subframe set may include all CSI-RS acks.

At this time, the two CSI subframe sets may each include a CSI-RS accession. If no CSI process is set up for the UE, the UE generates a CSI report of the serving cell, one for each CSI subframe set. Therefore, when the serving cell sets up the CSI subframe set for the UE, the serving cell forwards the two CSI-RS allocation settings to the UE through RRC signaling. In this case, CSI-RS allocation information for each CSI subframe set may be included as an information element (IE) in the LTE parameter 'csi-SubframePatternConfig-r10'. FIG. 4 is a diagram illustrating a csi-SubframePatternConfig-r10 parameter according to an exemplary embodiment.

FIG. 5 is a diagram illustrating a CSI-RS accession set in the same manner as a subframe set according to an embodiment.

A subframe set according to an embodiment includes a CSI-RS access and a terminal can generate a single CSI report from a combined CSI-RS resource included in a CSI-RS access. Referring to FIG. 5, a first CSI subframe set is represented by a lattice pattern, and a second CSI subframe set is indicated by a hatched pattern.

The serving cell may consider the period of the CSI-RS and the subframe offset for the bitmap design so that the CSI-RS subframe belonging to the CSI-RS accession may be included in the same CSI subframe set.

For example, if the period of the CSI-RS occasion in the FDD serving cell is 80 ms or 160 ms, the CSI subframe set pattern may be determined to be 40 ms. In this case, the serving cell may set the bitmap so that the CSI subframe set includes the CSI-RS accesses. It is assumed that the UE receives the CSI-RS in the subframe included in the intersection of the CSI-RS and CSI subframe sets.

Alternatively, if the period of the CSI-RS occasion in the FDD serving cell is 5 ms, 10 ms, 20 ms, the CSI subframe pattern may be determined to be 40 ms. In this case, the serving cell can repeat the CSI-RS operation to derive the pattern of the CSI-RS subframe corresponding to 40 ms and set the bitmap.

Next, in coexistence method 2, the terminal can generate a CSI report for each CSI subframe set within the CSI-RS operation.

If a subframe included in a CSI-RS allocation is included in a different CSI subframe set (i.e., a subframe included in one CSI subframe set is included in a different CSI-RS allocation) , Coexistence method 2 may be applied. That is, the UE can generate a CSI report for each CSI subframe set within a CSI-RS accession. At this time, the CSI-RS resources constituting one combined CSI-RS resource may be included in the same CSI subframe set. According to coexistence method 2, the CSI-RS setting corresponding to two CSI subframe sets can be determined by performing the CSI-RS assignment once.

When coexistence method 2 is applied, association information can be defined in the specification (coexistence method 2-1). At this time, the serving cell does not additionally signal CSI-RS combining information for each CSI subframe set.

The UE can receive a CSI-subset set configuration and a CSI-RS set-up configuration from a serving cell. The UE can distinguish the first CSI-RS resource subset included in the first CSI-RS subset and the second CSI-RS resource subset included in the second CSI-subframe set from the combined CSI-RS resources. At this time, the terminal can generate a CSI report by applying an appropriate codebook according to the setting of each CSI-RS resource subset (e.g., RE mapping, CSI port count, etc.).

In coexistence method 2-1, the terminal may know a codebook that should be applied to a subset of any combined CSI-RS resources. To this end, the serving cell may perform RRC signaling on the codebook for the terminal, or the codebook to which the terminal should apply, may be predetermined in the LTE standard. For example, CSI-RS resource IDs 0, ID 1, ID 2, and ID 3 may be combined by setting CSI-RS if the terminal does not receive a setting related to the CSI subframe set. If the UE receives the setting related to the CSI subframe set, the UE observes CSI-RS resource ID 0, ID 2 in the first CSI-RS subframe set and CSI-RS resource ID 0, -RS Resource ID 1, ID 3 can be observed. Then, the terminal generates a CSI report according to the CSI-RS resource setting of CSI-RS resource ID 0 and ID 2. Then, the UE can generate another CSI report according to the CSI-RS resource setting of CSI-RS resource ID 1 and ID 3.

Or Coexistence Method 2 is applied, the serving cell can further RRC signal the binding information to the UE (Coexistence Method 2-1).

The UE receives both CSI subframe set and CSI-RS accession settings from the serving cell. In this case, the UE can implicitly know the CSI-RS resources included in the same CSI subframe set, but the serving cell can not explicitly disclose a subset of any combined CSI- Can be informed. Coexistence method 2-1 may be functionally equivalent to explicitly RRC signaling the codebook that the terminal should apply to the CSI report.

FIG. 6 is a diagram illustrating a CSI-RS occasion configured concurrently with a CSI subframe set according to an embodiment.

Referring to FIG. 6, a PRB pair is shown when a CSI-RS accession and a CSI subframe set are simultaneously set in a terminal. In Fig. 6, a portion indicated by a horizontal stripe represents a first CSI subframe set, and a portion indicated by a vertical stripe represents a second CSI subframe set.

For example, the UE may combine CSI-RS resource IDs 0, ID 1, ID 2, and ID 3 by setting CSI-RS. If the UE receives the CSI subframe set configuration, the CSI report generated by the UE may correspond to at least CSI-RS resources {ID 0, ID 2} and CSI-RS resources {ID 1, ID 3}. If a serving cell desires a CSI report using only the CSI-RS resource {ID 2}, the serving cell may additionally allocate a list of CSI-RS resource IDs to the UE or provide binding information for generating a separate CSI report to the UE RRC signaling. The CSI-RS operation and the CSI-RS subframe set according to an embodiment are simultaneously set in the UE when the serving cell sets both the horizontal CSI report and the cooperative CSI report in the UE. The UE can generate a cooperative CSI report from the CSI-RS resource IDs 0 and 2 in the same combined CSI-RS resource according to the serving cell combination information, and generate the horizontal CSI report from the CSI-RS resource ID 2.

Also, the UE can consider combining various combinations of CSI-RS resources with respect to CSI-RS resources included in the same CSI subframe set through the added combining information.

On the other hand, when the terminal generates a plurality of CSI reports, a channel state information process (CSI process) can be set. The serving cell may establish at least one CSI process to the terminal according to an interference hypothesis or a Coordinated MultiPoint (CoMP) hypothesis.

The CSI process may be configured with CSI-RS configuration and channel state information-interference measurement (CSI-IM) settings. The CSI-RS and CSI-IM settings are similar, and both have similar IEs except for the number of CSI-RS port numbers. The CSI-IM resource may also be in the form of an occasion to consider when the terminal must receive a CSI-RS access from a neighboring cell.

When the CSI process is set up, the information that the serving cell delivers to the terminal may include:

- CSI process configuration

CSI process ID

A CSI-RS resource list and association information if configured for each CSI process ID,

The CSI-IM resource list for each CSI process ID and the combined information if set

The combined CSI-RS resource configuration can be reused as described above. When a plurality of CSI reports are generated in the CSI-RS resource list, the combining information may be set, and when one CSI report is generated, the combining information may not be set. At this time, the combined CSI-IM resource configuration can be set as a set of CSI-IM resources.

Meanwhile, the CSI reference resource for the CSI process ID when the CSI process is set may include both the CSI reference resource of the CSI-RS resource combination and the CSI reference resource of the CSI-IM resource combination.

As a CSI-RS improvement method, a plurality of CSI-RS resources for one CSI process can be set in the terminal. At this time, the IDs of a plurality of CSI-RS resources included in the same CSI process can be defined according to the following method.

- How multiple CSI-RS resources have a common NZP CSI-RS ID

- How multiple CSI-RS resources have different NZP CSI-RS IDs

For a method in which a plurality of CSI-RS resources have a common NZP CSI-RS ID, it can be assumed that a QCL is established among a plurality of CSI-RS resources having a common NZP CSI-RS ID. Therefore, the parameter set of the PQI may include one NZP CSI-RS ID (e.g., 'qcl-CSI-RS-ConfigNZPId-r11').

In the case of a method in which a plurality of CSI-RS resources have different NZP CSI-RS IDs, it may be assumed that a QCL is always established among a plurality of CSI-RS resources having different NZP CSI-RS IDs in one CSI process , And it may be assumed that the QCL does not basically exist, unless there is extra information. When it is assumed that QCL is always established between a plurality of CSI-RS resources, the parameter set of the PQI may include one NZP CSI-RS ID. However, if it is assumed that the QCL is basically not established, the set (s) of CSI-RS resources, which may indicate that there is a QCL relationship with each other, may be provided to the terminal via additional signaling. In one embodiment, a set of CSI-RS resources or corresponding IDs that may indicate a QCL relationship with each other is referred to as a QCL set. Table 1 exemplarily shows a QCL set for CSI-RS resources included in one CSI process. Referring to Table 1, QCL sets for five CSI-RS resources having different NZP CSI-RS IDs are set in one CSI process.

CSI- RS  resource ID QCL  set CSI-RS resource A NZP CSI-RS ID 0 QCL set 1 = {NZP CSI-RS ID 0, 1, 2} CSI-RS resource B NZP CSI-RS ID 1 CSI-RS resource C NZP CSI-RS ID 2 CSI-RS resource D NZP CSI-RS ID 3 QCL set 2 = {NZP CSI-RS ID 3, 4} CSI-RS resource E NZP CSI-RS ID 4

In this case, instead of the NZP CSI-RS ID included in the parameter set of the PQI, an index of the QCL set in which the QCL relationship with the PDSCH antenna port is established may be signaled to the UE for the QCL assumption of the PDSCH antenna port of the UE . Or the PQI parameter set may include at least one NZP CSI-RS ID among the CSI-RS resources for which a QCL relationship with the PDSCH antenna port is established. In this case, the NZP CSI-RS ID may be the lowest ID in the QCL set or may be an arbitrarily selected ID within the QCL set.

For methods in which a plurality of CSI-RS resources have different NZP CSI-RS IDs, an extension of 'qcl-CRS-Info-r11' IE may also be required.

On the other hand, a UE having a CSI process and a CSI subframe set simultaneously from a serving cell can distinguish resources included in a CSI subframe set having the same CSI-RS resource and a CSI-IM resource. At this time, the CSI-RS resource and the CSI-IM resource can be set in the terminal through the CSI process. The UE can generate the CSI report based on the association information of the identified resources or association assumption.

According to one embodiment, similar to the case of CSI-RS, Zero-power (ZP) CSI-RS can be set in consecutive subframes. That is, the UE can assume the ZP CSI-RS in the subframe included in the CSI-RS. At this time, for each subframe, an independent ZP CSI-RS mapping can be assumed. Since the ZP CSI-RS can be used for rate matching of the PDSCH or rate matching of the Enhanced Physical Downlink Control Channel (EPDCCH), or can be used for the CSI-IM setting, the ZP CSI- The RS resources are not aggregated and thus the binding information is unnecessary.

ZP CSI-RS The ZP CSI-RS assignment for the resource can contain the following information:

- ZP CSI-RS Occupancy Cycle

- ZP CSI-RS allocation sub-frame offset

- ZP CSI-RS accession duration (may be omitted if ZP CSI-RS accession subframe is one subframe length)

- ZP CSI-RS resource ID list

Set ZP CSI-RS resource for each ZP CSI-RS resource ID

Relative subframe offset for each ZP CSI-RS resource ID (set only if ZP CSI-RS accession duration is set, otherwise may be omitted)

According to one embodiment, channel state information interference measurement (CSI-IM) resources may be set in consecutive subframes. That is, the UE can assume a CSI-IM resource in a subframe included in the CSI-RS resource. For each subframe, an independent CSI-IM resource mapping can be assumed.

The CSI-IM assignment settings for CSI-IM resources may include the following information:

- CSI-IM cycle

- CSI-IM Occupation sub-frame offset

- The duration of the CSI-IM occasion (may be omitted if the duration of the CSI-IM occasion is one subframe)

- CSI-IM resource ID list

CSI-IM resource configuration for each CSI-IM resource ID

The relative sub-frame offset for each CSI-IM resource ID (set only if the CSI-IM accession duration is set, otherwise may be omitted)

Combination information for each CSI-IM resource ID (set only if the CSI-IM accession duration is set, otherwise may be omitted)

The UE can derive a channel quality indicator (CQI) by considering the CSI-IM resource included in the CSI-IM operation as a new CSI-IM resource. When a serving cell sets a CSI-IM resource over a plurality of CSI-IM subframes, the serving cell preliminarily sets a period and a subframe offset to the UE in order to inform the UE of the location of the CSI-IM subframe. In addition, the relative subframe offset information and the combining information may be preset in the terminal.

According to one embodiment, when a CSI-RS allocation is set, a physical downlink shared channel (PDSCH) and an enhanced physical downlink control channel (PDSCH) are allocated in each subframe included in the CSI-RS and ZP CSI- rate matching for an enhanced Physical Downlink Control Channel (EPDCCH) can be independently applied.

According to one embodiment, aperiodic CSI reports may also be supported. At this time, even in the case of an aperiodic CSI report, as in a periodic CSI report, a plurality of CSI reports can be generated from a plurality of CSI-RS resources.

The aperiodic CSI report may be indicated by a 1-bit CSI request field along with an uplink grant (UL grant) in DCI format 0 or format 4. The terminal interprets the CSI request field, generates a CSI report from the CSI reference resource, and assigns the CSI report generated with the transport block referred to by the UL grant to the RE.

When the CSI-RS is transmitted through the established CSI-RS access, the UE receives an aperiodic CSI request from the serving cell, and based on the CSI derived from the most recently received CSI-RS access, You can create a report.

The aperiodic CSI report may include a CSI-RS resource ID and interference / noise estimation reset signaling. If the serving cell requests an aperiodic CSI report to the UE, the serving cell may perform interference / noise estimation reset by adding a separate 1-bit field for the CSI request field in DCI format 0 or format 4, . For example, if the CSI request bit field is 1 (CSI request bit field = 1) and the interference / noise estimation reset bit field is 1 (interference / noise estimation reset bit field = 1), the UE transmits interference and noise to the corresponding DCI A new subframe including a downlink subframe in which a format is received can be newly measured and a CSI report can be generated. If the CSI request bit field is 1 (CSI request bit field = 1) and the interference / noise estimation bit field is 0 (interference / noise estimation reset bit field = 0), the UE does not newly measure interference and noise, You can create a report.

The following describes the CSI-RS port mapping.

When the serving cell sets a plurality of CSI-RS resources to the UE, the CSI-RS ports included in each CSI-RS resource can be sequentially numbered (for example, {15, 16, ... }). However, the UE can correctly recognize the CSI-RS port configuration of the serving cell by reconstructing the CSI-RS port transmitted from the serving cell.

In one embodiment, if a codebook that interprets {1, 2, 4, 8} CSI-RS ports as a one-dimensional array is used, the UE sets the CSI-RS port setting of the serving cell to the existing CSI- index) to perform channel estimation. However, if more than eight CSI-RS ports are set for the UE, the serving cell can transmit the CSI-RS to the UE using a plurality of CSI-RS resources.

A one-dimensional CSI-RS port configuration (1D CSI-RS port configuration) according to one embodiment will be described below.

In this case, the serving cell sets up Q QSI-RS ports. Q can be obtained by _{(Q 1, Q 2, Q} 3, Q 4) in accordance with equation (3).

In this case, for the transmission of the Q pieces of CSI-RS port, the 8-port CSI-RS resource Q ₁ dog, dog is 4-port CSI-RS resource Q _2, the two-port CSI-RS resource Q ₃ pieces, _Four Q 1-port CSI-RS resources may be used. (Q ₁ , Q ₂ , Q ₃ , Q ₄ ) can be determined as {Q ₂ , Q ₃ , Q ₄ } ⊂ {0,1} to be uniquely determined. When a plurality of different CSI-RS resources are set and operated, the signaling overhead is increased and the channel estimation error is not improved as compared with a single CSI-RS resource.

At this time, the CSI-RS port order can be reconfigured such that the order of the CSI-RS ports in one CSI-RS resource matches the order of the CSI-RS ports defined in all of the aggregated CSI-RS resources. In this case, the existing LTE standard is re-used in each CSI-RS resource and the order of CSI-RS ports can be maintained.

When the CSI-RS port of the serving cell is composed of (M, N, P), Q = M x N x P can be given. In the case of one-dimensional setting, since M = 1, Q can be expressed by Equation (4) below.

7 is a diagram illustrating CSI-RS port indexing in a CSI-RS resource according to an embodiment.

Referring to FIG. 7, the CSI-RS ports in one CSI-RS resource may be allocated in the order of antenna elements having the same polarization characteristic.

In Equation 4, Q ₁ 8-port CSI-RS resources correspond to CSI-RS ports, Q ₂ 4-port CSI-RS resources correspond to CSI-RS ports, Q ₃ 2-port CSI- -RS resource corresponds to a CSI-RS port, and Q ₄ -port CSI-RS resources can sequentially correspond to a CSI-RS port. If a cross pol configuration is applied, Q ₄ = 0.

In order for the CSI-RS ports to be referred to in order, the following relationship can be established.

The 15-th CSI-RS resource of q ₁ ∈ {1,2, ..., Q ₁ } is 15 + 4 (q ₁ -1) + {0,1,2,3} and 15 + N + 4 (q ₁ -1) + {0, 1, 2, 3}.

q ₂ = the first 4-port CSI-RS resource can be composed of 15 + 4 (Q ₁ -1) + {0,1} and 15 + N + 4 (Q ₁ -1) + {0,1} (When Q ₂ = 1).

q ₃ = 1 beonjjae-port CSI-RS _{resource, 15 + 4 (Q 1 -1} ) +2 (Q 2 -1) and _{15 + N + 4 (Q 1} -1) +2 (Q 2 -1 ) it may be formed of (Q = ₃ time a day).

Hereinafter, a two-dimensional CSI-RS port configuration (2D CSI-RS port configuration) according to another embodiment will be described.

In a two-dimensional uniform array (URA) antenna, the CSI-RS port can be allocated in the following two ways. In the first method, when a 1D PMI codebook or a 2D PMI codebook is set in a serving cell, the CSI-RS port is rearranged in a line and the CSI-RS port order is allocated to the terminal. In the second method, when a 1D PMI codebook or a 2D PMI codebook is set in the serving cell, the CSI-RS port is rearranged to the 2-dimensional position and the CSI-RS port order is allocated to the UE.

If a plurality of CSI-RS resources having a 2D CSI-RS port allocation are arranged in a row, the CSI-RS port setting can be converted to be one 2D CSI-RS port allocation having the same rule.

For a 2D CSI-RS port allocation given by (M, N, P), a plurality of CSI-RS resources may be used. The serving cell can inform the terminal of the order of each CSI-RS resource and the allocation information (M or N value) of the 2D CSI-RS port. At this time, the serving cell can inform the UE of the relative location of the CSI-RS resources. For example, the serving cell may inform the UE of 2D placement information about how many CSI-RS resources are on the horizontal axis and how many on the vertical axis. After the MS relocates the CSI-RS resource logically in 2D, the MS can reconfigure the CSI-RS port numbering according to the CSI-RS port numbering method specified by the serving cell.

8 is a diagram illustrating CSI-RS resources defined in multiple subframes according to an exemplary embodiment.

Referring to FIG. 8, a serving cell defines four CSI-RS resource IDs, and CSI-RSs can be transmitted in two subframes. At this time, the CSI-RS allocation of the serving cell can be defined as shown in FIG. Referring to FIG. 8, a serving cell transmits CSI-RS resource IDs 1, 2, 3, and 4. When it is assumed that the UE observes the CSI-RS resource IDs 1 and 4, the information that the serving cell transmits to the UE may include the following information.

- CSI-RS occasion configurations:

Cycle

Duration: 2 ms

The sub-frame offset of the first CSI-RS subframe

CSI-RS resource list: CSI-RS port resource list: ID A, ID B

- CSI-RS resource ID: A (corresponding to ID 1)

Number of CSI-RS ports: 8

CSI-RS resource configuration index: 2

- CSI-RS resource ID: B (corresponding to ID 4)

Number of CSI-RS ports: 8

CSI-RS resource setting Index: 2

CSI-RS Relative CSI-RS subframe offset for resource ID 1: 1

At this time, the terminal can generate a CSI report for CSI-RS resource IDs 1 and 4. The terminal uses CSI-RS port {15, 16, ..., 22} and CSI-RS resource setting index 2 for CSI-RS resource ID 1 and CSI- 15, 16, ..., 22} and the CSI-RS resource setting index 2 are used.

Based on the estimated CSI, the terminal can generate a CSI report based on the codebook. In addition, the UE can derive noise and interference using all the subframes included in the CSI-RS accession.

9 is a diagram illustrating CSI-RS resources defined in a single subframe according to an embodiment.

Referring to FIG. 9, a serving cell defines four CSI-RS resource IDs, and a CSI-RS can be transmitted in one subframe. At this time, the CSI-RS allocation of the serving cell can be defined as shown in FIG. At this time, the information that the serving cell transmits to the UE may include the following information.

- CSI-RS setting:

Cycle

The sub-frame offset of the first CSI-RS subframe

CSI-RS resource list: ID 1, ID 2, ID 3, ID 4

CSI-RS Resource ID: 1

Number of CSI-RS ports: 8

CSI-RS resource setting index: 0

CSI-RS Resource ID: 2

Number of CSI-RS ports: 8

CSI-RS resource setting Index: 1

CSI-RS Resource ID: 3

Number of CSI-RS ports: 8

CSI-RS resource setting index: 3

CSI-RS Resource ID: 4

Number of CSI-RS ports: 8

CSI-RS resource setting Index: 4

The terminal can generate a CSI report for CSI-RS resource ID 1 & ID 2 & ID 3 & ID 4. Referring to FIG. 9, the UE can consider that the CSI-RS port {15, 16, ..., 22} and the CSI-RS resource setting index 0 are used for the CSI-RS resource ID 1. Alternatively, the terminal can consider that CSI-RS port {15, 16, ..., 22} and CSI-RS resource setting index 1 are used for CSI-RS resource ID 1. [ The terminal can regard CSI-RS port {15, 16, ..., 22} and CSI-RS resource setting index 3 as being used for CSI-RS resource ID 2. The terminal can consider that the CSI-RS port {15, 16, ..., 22} and the CSI-RS resource setting index 4 are used for the CSI-RS resource ID 3. Based on the estimated CSI, the terminal can generate a CSI report based on the codebook.

At this time, the UE can utilize the union of the CSI reference resources applied to the CSI-RS resource IDs 1 & 2 & 3 & 4 to generate the CSI report.

10 is a diagram illustrating CSI-RS resources defined in a single subframe according to another embodiment.

In another embodiment, the serving cell may receive a CSI report for horizontal CSI and vertical CSI separately. Referring to FIG. 10, a serving cell defines two CSI-RS resource IDs, and a CSI-RS can be transmitted in one subframe. At this time, the information that the serving cell transmits to the UE may be information on the CSI-RS resource ID 1 and the CSI-RS resource ID 2.

- CSI-RS setting:

Cycle

Duration: 1 ms

The sub-frame offset of the first CSI-RS subframe

CSI-RS resource list: ID 1, ID 2

CSI-RS Resource ID: 1

Number of CSI-RS ports: 4

CSI-RS resource setting index: 0

CSI-RS Resource ID: 2

Number of CSI-RS ports: 8

CSI-RS resource setting Index: 4

Relative CSI-RS subframe offset: 0 (optional)

The terminal can generate a CSI report for CSI-RS resource ID 1. [ In this case, the UE can consider that the serving cell transmits the CSI-RS using the CSI-RS port {15, 16, 17, 18} and the CSI-RS resource configuration index 0. Then, the terminal generates a CSI report according to the 4-Tx codebook.

The terminal can generate a CSI report for CSI-RS resource ID 2. The UE can consider the serving cell to transmit the CSI-RS using the CSI-RS port {15, 16, ..., 22} and the CSI-RS resource configuration index 4. Then, the terminal generates a CSI report according to the 8-Tx codebook.

11 is a diagram illustrating CSI-RS resources defined in multiple subframes according to another embodiment.

According to another embodiment, the UE can perform not only the CSI report of the serving cell but also the CSI report on the CSI-RS transmitted from the adjacent cell, in which case at least one CSI process can be defined. At this time, the serving cell can transmit the following information to the UE for the CSI process.

- CSI-RS setting:

Cycle

Duration

First sub-frame offset

CSI Process List: ID 1, ID 2, ID 3

- CSI process ID: 1

Subframe offset of the first CSI-RS subframe included in the CSI-RS operation: 1

CSI-RS resource list: ID 1

CSI-RS Resource ID: 1

Number of CSI-RS ports: 8

CSI-RS resource setting Index: 2

CSI Process ID: 2

Sub-frame offset of the first CSI-RS subframe included in the CSI-RS operation: 0

CSI-RS resource list: ID 1

CSI-RS Resource ID: 1

Number of CSI-RS ports: 8

CSI-RS resource setting Index: 2

CSI process ID: 3

Sub-frame offset of the first CSI-RS subframe included in the CSI-RS operation: 0

CSI-RS resource list: ID 1, ID 2

CSI-RS Resource ID: 1

Number of CSI-RS ports: 4

CSI-RS resource setting Index: 2

CSI-RS Resource ID: 2 (see)

Number of CSI-RS ports: 8

CSI-RS resource setting Index: 2

CSI-RS Port relative to subset ID 1 CSI-RS Sub-frame offset: 2

In another embodiment, the terminal may generate a separate CSI report for each CSI process. The terminal may have a common CSI reference resource assumption so that the CSI processes all have noise and interference estimates in common. To this end, the duration of the CSI-RS occasion and the subframe offset of the CSI-RS occasion may be aligned equally and the CSI-RS may be transmitted in the same CSI-RS occasion. In this case, the UE measures noise and interference in the union of subframes included in each CSI process. Referring to FIG. 11, the UE can interpret three subframes as CSI reference resources.

In CSI process ID 1, one CSI report can be generated. The terminal generates a CSI report based on the 8-Tx codebook based on the CSI-RS ports {15, 16, ..., 22}.

In CSI process ID 2, one CSI report can be generated. The terminal generates a CSI report based on the 8-Tx codebook based on the CSI-RS ports {15, 16, ..., 22}.

In CSI process ID 3, one CSI report can be generated through CSI-RS resource ID 1 and ID 2 based on the combination information. The UE can consider the serving cell to transmit the CSI-RS using the CSI-RS port {15, 16, 17, 18} in the CSI-RS resource ID 1. [ CSI-RS resource ID 2 may be transmitted using CSI-RS ports {15, 16, ..., 22} after two subframes from CSI-RS resource ID 1. [ The terminal generates a CSI report based on the estimated CSI based on the 12-Tx codebook.

12 is a diagram illustrating CSI-RS port numbering of a serving cell according to another embodiment.

According to another embodiment, a serving cell may transmit a CSI-RS port with (M, N, P) is (4, 2, 2) as two 8-port CSI-RS resources. In another embodiment shown in FIG. 12, the serving cell has set up a 2D PMI codebook (2,2,2) for the terminal. The serving cell may transmit the CSI-RS port as shown in FIG. 12 (a).

Referring to FIG. 12B, the UE receives the first CSI-RS resource and the second CSI-RS resource, and receives M = 4 from the serving cell. Since the UE knows M at all 16 CSI-RS ports, N = 2 (N = 16 / M / P = 2). Accordingly, the UE can determine whether the received CSI-RS resources should be arranged horizontally in a row or vertically in a row.

Referring to FIG. 12C, since M = 4 and N = 2, the UE can vertically arrange the first CSI-RS resource and the second CSI-RS resource consecutively. The terminal uses the numbering rule in the serving cell as it is, designates the horizontal port first, specifies the polarization next, and then places the next row. Referring to FIG. 12 (d), the terminal can complete the numbering of the entire CSI-RS port by applying this process to the entire columns.

13 is a diagram illustrating CSI-RS port numbering of a serving cell according to another embodiment.

Referring to FIG. 13A, a serving cell can transmit a CSI-RS port with (M, N, P) (4, 4, 2) as four CSI-RS resources. The serving cell has set up a 2D PMI codebook (2, 2, 2) for the UE and informed the UE of the manner in which each CSI-RS resource is located.

Referring to FIG. 13B, the UE transmits a first CSI-RS resource corresponding to a 1x1 position, a second CSI-RS resource corresponding to a 1x2 position, a third CSI-RS resource corresponding to a 2x1 position, , The fourth CSI-RS resource corresponding to the 2x2 position can be recognized through the information provided by the serving cell. Referring to (c) of FIG. 13, the UE can estimate the port numbering of the CSI-RS port transmitted by the serving cell by integrating the location of the CSI-RS resource. Referring to FIG. 13 (d), the UE uses the numbering rule in the serving cell as it is, designates the horizontal port first, designates the polarization, and then places the next row. As a result, the terminal can complete the numbering of the entire CSI-RS port by applying the above procedure to the entire column.

As described above, according to embodiments of the present disclosure, a CSI report for a greater number of antenna ports can be generated using a CSI-RS operation comprising at least one subframe.

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

Referring to FIG. 14, a wireless communication system according to an embodiment includes a base station 1410 and a terminal 1420.

The base station 1410 includes a processor 1411, a memory 1412, and a radio frequency unit (RF unit) 1413. The memory 1412 may be coupled to the processor 1411 to store various information for driving the processor 1411 or at least one program to be executed by the processor 1411. [ The wireless communication unit 1413 is connected to the processor 1411 to transmit and receive a wireless signal. The processor 1411 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 the embodiment of the present invention, the wireless interface protocol layer can be implemented by the processor 1411. The operation of base station 1410 in accordance with one embodiment may be implemented by processor 1411. [

The terminal 1420 includes a processor 1421, a memory 1422, and a wireless communication unit 1423. The memory 1422 may be coupled to the processor 1421 to store various information for driving the process 1421. The wireless communication unit 1423 is connected to the processor 1421 to transmit and receive wireless signals. The processor 1421 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 disclosure, the wireless interface protocol layer can be implemented by the processor 1421. [ The operation of terminal 1420 according to one embodiment may be implemented by processor 1421. [

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).

Although the embodiments have been described in detail, the scope of the rights is not limited thereto, and various modifications and improvements of the skilled person using the basic concepts defined in the following claims are also within the scope of the right.

Claims (20)

A method for generating a channel state information (CSI) report of a terminal,
Receiving a CSI-RS from at least one CSI-RS resource included in a channel state information-reference signal (CSI-RS)
Generating a CSI report based on the CSI-RS received via the at least one CSI-RS;
And generating a CSI report. The method of claim 1,
Wherein the CSI-RS operation comprises at least one subframe. The method of claim 1,
Receiving, from the base station, setting information for the CSI-RS operation before the receiving step
And generating a CSI report. 4. The method of claim 3,
The step of receiving configuration information for the CSI-RS from the base station includes receiving configuration information for the CSI-RS via radio resource control (RRC) signaling from the base station Step
And generating a CSI report. 4. The method of claim 3,
The setup information for the CSI-RS operation includes at least one of period information of the CSI-RS, information of subframe offset of the CSI-RS, or identifier list of the CSI-RS resource , CSI report generation method. The method of claim 5,
Wherein the identifier list information of the CSI-RS resource includes information on the number of antenna ports for each CSI-RS resource included in the at least one CSI-RS resource, information about the setting of the at least one CSI- , Information about a relative sub-frame offset of the at least one CSI-RS resource, or combining information of the at least one CSI-RS resource. The method of claim 1,
Wherein the generating comprises:
Generating a plurality of CSI reports for the CSI-RS < RTI ID = 0.0 >
And generating a CSI report. 8. The method of claim 7,
Wherein the generating comprises:
Generating CSI reports based on combined information of CSI-RS resources defined for the CSI-RS
And generating a CSI report. The method of claim 1,
The method of claim 1, further comprising: prior to the step of receiving, setting information of a ZP CSI-RS allocation related to a Zero Power (ZP) CSI-RS resource included in the CSI-
Further comprising:
The setting information of the ZP CSI-RS accession may include period information of the ZP CSI-RS accession, information of a subframe offset of the ZP CSI-RS accession, duration information of the ZP CSI-RS accession, And an identifier list information of the ZP CSI-RS resource. The method of claim 1,
(CSI-IM) resource related to a channel state information-interference measurement (CSI-IM) resource included in the CSI-RS access from the base station step
Further comprising:
The setting information of the CSI-IM operation includes at least one of period information of the CSI-IM operation, subframe offset information of the CSI-IM operation, duration information of the CSI-IM accession, The identifier list information of the CSI report. 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 CSI-RS from at least one CSI-RS resource included in a channel state information-reference signal (CSI-RS)
Generating a CSI report based on the CSI-RS received via the at least one CSI-RS;
. 12. The method of claim 11,
Wherein the CSI-RS operation comprises at least one subframe. 12. The method of claim 11,
Wherein the at least one processor is configured to execute the at least one program to receive configuration information for the CSI-RS operation from the base station prior to performing the receiving step
. The method of claim 13,
Wherein the at least one processor is configured to perform Radio Resource Control (RRC) signaling from the base station when performing the step of receiving configuration information for the CSI-RS operation from the base station by executing the at least one program, receiving configuration information for the CSI-RS via signaling
. The method of claim 13,
The setup information for the CSI-RS operation includes at least one of period information of the CSI-RS, information of subframe offset of the CSI-RS, or identifier list of the CSI-RS resource , Terminal. 16. The method of claim 15,
Wherein the identifier list information of the CSI-RS resource includes information on the number of antenna ports for each CSI-RS resource included in the at least one CSI-RS resource, information about the setting of the at least one CSI- , Information about a relative sub-frame offset of the at least one CSI-RS resource, or combining information of the at least one CSI-RS resource. 12. The method of claim 11,
Wherein the at least one processor, when executing the at least one program to perform the generating,
Generating a plurality of CSI reports for the CSI-RS < RTI ID = 0.0 >
. The method of claim 17,
Wherein the at least one processor, when executing the at least one program to perform the generating,
Generating CSI reports based on combined information of CSI-RS resources defined for the CSI-RS
. 12. The method of claim 11,
Wherein the at least one processor executes the at least one program and prior to the receiving step the ZP CSI-RS resource associated with the Zero Power (ZP) CSI-RS resource included in the CSI- Stepping through setting information of RS
Lt; / RTI >
The setting information of the ZP CSI-RS accession may include period information of the ZP CSI-RS accession, information of a subframe offset of the ZP CSI-RS accession, duration information of the ZP CSI-RS accession, And an identifier list information of the ZP CSI-RS resource. 12. The method of claim 11,
The at least one processor executes the at least one program and performs a channel state information-interference measurement (CSI-IM) measurement included in the CSI-RS operation from the base station, The step of setting information of the CSI-IM operation concerning the resource
Lt; / RTI >
The setting information of the CSI-IM operation includes at least one of period information of the CSI-IM operation, subframe offset information of the CSI-IM operation, duration information of the CSI-IM accession, The identifier list information of the terminal.

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