KR20140116705A - Method and apparatus of supporting comp considering nct in wireless communication system - Google Patents

Abstract

The present invention relates to Coordinated MultiPoint (CoMP) support method and apparatus for a Cooperative Multipoint Point (CoMP) considering a NCT in a wireless communication system, and a base station according to the present invention performs CoMP operation for a UE with RRC A message processor for generating an RRC connection reestablishment message including CoMP configuration information, a transmitter for transmitting the generated RRC connection re-establishment message to the UE, and a RRC connection re-establishment corresponding to the RRC connection re- The RRC connection re-establishment message generated by the message processing unit is a new carrier type (NCT) cell connected to the UE according to the CoMP setting, (Physical Downlink Shared Channel) resource element (RE) mapping and QCL (Quasi Co-Location) And further includes one piece of information.

Description

Technical Field [0001] The present invention relates to a CoMP support method and an apparatus for supporting CoMP in a wireless communication system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to wireless communication, and more particularly, to a Coordination Multi-Point (CoMP) supporting method and a device thereof in consideration of NCT (New Carrier Type) in a wireless communication system.

A multi-element carrier system refers to a wireless communication system capable of supporting carrier aggregation (CA). Carrier aggregation is a technique for efficiently using fragmented small bands. It has the same effect as using a logically large bands by bundling a plurality of physically continuous or non-continuous bands in the frequency domain. In order to make it possible.

However, the component carrier (CC) used in the existing LTE system emphasizes the general purpose of the physical layer, and there is still a control area overlap and a common signal overhead, so that the data area to be transmitted is reduced and spectral efficiency and there is an unnecessary loss in terms of efficiency. Accordingly, in order to efficiently operate the multi-carrier system, it is required to introduce a new carrier type (NCT: New Carrier Type) constituting a multi-carrier system. In the NCT, signaling for control signaling or channel estimation can be eliminated or reduced within a range in which there is no deterioration or minimization of performance as compared with a legacy carrier type (LCT: Legacy Carrier Type). Thus, the maximum data transmission efficiency can be obtained. The NCT cell using the NCT carrier may be included as a secondary serving cell (Scell) when the primary serving cell is a legacy carrier type at the time of carrier aggregation. At this time, the NCT cell can not exist in a single cell form and can be a non-stand alone cell existing as a secondary serving cell only when the main serving cell exists. Alternatively, the NCT cell may be used as the main serving cell. At this time, the cell of the NCT may be a stand alone cell which may exist in a single cell form.

Meanwhile, multi-cell (or point) cooperation has been introduced to increase the performance and communication capacity of a wireless communication system. Multi-cell (or point) cooperative transmission and reception is also referred to as Coordinated MultiPoint (CoMP) transmission and reception. CoMP includes a beam avoiding technique in which neighboring cells (or points) cooperate to mitigate interference to a user at a cell (or point) boundary, a joint transmission technique in which neighboring cells cooperate to transmit the same data, And a dynamic point selection method in which one of the cells is dynamically selected and data is transmitted. In a next generation wireless communication system such as IEEE (Institute of Electrical and Electronics Engineers) 802.16m or 3GPP (Long Term Evolution) -Advanced, performance of users Is one of the main requirements, and CoMP can be considered to solve this problem. The CoMP can be performed based on various scenarios. In order for the CoMP to be smoothly performed, information on the cells (or points) constituting the CoMP should be provided to the base station and the UE. Therefore, it is required to transmit and receive information (e.g., control signaling) about the cells of the NCT between the UE and the base station for smooth CoMP in the wireless communication system constituting the NCT cell.

SUMMARY OF THE INVENTION The present invention provides a method and apparatus for CoMP support considering NCT in a wireless communication system.

Another aspect of the present invention is to provide information on PDSCH RE mapping and QCL considering the NCT to a UE.

Another aspect of the present invention is to transmit and receive parameters of a PDSCH resource mapping specific to an NCT cell from a BS to a UE.

Another aspect of the present invention is to support CoMP smoothly by providing the UE with information that the PDSCH is mapped to the physical layer, which is unique to the NCT cell.

According to an aspect of the present invention, a base station supporting Coordination Multi-Point (CoMP) is provided. The base station includes a CoMP control unit for deciding to perform a CoMP operation with respect to a UE having an established RRC connection, a message processing unit for generating an RRC connection reestablishment message including CoMP configuration information, And a receiver for receiving an RRC connection reset completion message corresponding to the RRC connection reestablishment message from the terminal, wherein the RRC connection reestablishment message generated by the message processor is transmitted to the terminal (Resource Element) mapping and a QCL (Quasi Co-Location) unique to the NCT cell when the cell connected to the NCT cell is a NCT (New Carrier Type) cell. .

According to another aspect of the present invention, there is provided a terminal supporting CoMP. The UE includes a receiver for receiving from the base station an RRC connection reestablishment message including CoMP setting information and information on the QCS and PDSCH RE mapping specific to the NCT cell connected according to the CoMP setting, A message processor for analyzing the setting information, the PDSCH RE mapping and the QCL specific to the NCT cell and generating an RRC connection re-establishment completion message, and a RRC connection re-establishment completion message based on the CoMP setting information, the PDSCH RE mapping, A CoMP control unit for resetting the parameters, and a transmission unit for transmitting the generated RRC connection reset completion message to the base station.

According to another aspect of the present invention, there is provided a CoMP support method performed in a base station. The method includes: determining to perform a CoMP operation for an RRC connection established terminal, generating an RRC connection re-establishment message including CoMP configuration information, transmitting the generated RRC connection re-establishment message to the UE, And receiving an RRC connection re-establishment complete message corresponding to the RRC connection re-establishment message from the terminal, wherein the RRC connection re-establishment message is a message indicating that the cell connected to the UE according to the CoMP setting is an NCT cell, PDSCH RE mapping, and QCL.

According to another aspect of the present invention, there is provided a CoMP support method performed in a terminal. The method includes receiving from a base station an RRC connection reestablishment message including CoMP setting information and information on a QCS and a PDSCH RE mapping peculiar to an NCT cell connected according to the CoMP setting, Analyzing information on the PDSCH RE mapping and QCL unique to the NCT cell and generating an RRC connection re-establishment completion message; and analyzing the RRC related parameter based on the CoMP setting information, the PDSCH RE mapping, and the information on the QCL And transmitting the generated RRC connection re-establishment complete message to the base station.

According to the present invention, in the TM10 (i.e., CoMP) environment, the BS can transmit information about the PDSCH RE mapping and the QCL including the related parameters to the NCT cell constituting the CoMP cooperation set to the UE. The base station may transmit information about the PDSCH RE mapping and the QCL that adaptively include the relevant parameters if the NCT cell is an asynchronous NCT, synchronous NCT, or sleep mode supported NCT.

In this case, if the DCI included in the PDCCH (or EPDCCH) indicates the DCI format 1A or the DCI format 2D, the UE receives the PDDCH (or EPDCCH) from the base station constituting the CoMP cooperation set in the CoMP environment, It can adaptively receive and decode PDSCH according to the PDSCH RE mapping indicated by the QCL indicator field and the parameter set for QCL.

1 is a block diagram illustrating a wireless communication system to which the present invention is applied.
2 shows a structure of a subframe of a physical layer in a wireless communication system to which the present invention is applied.
FIG. 3 shows a structure of an uplink / downlink subframe in a wireless communication system in which the present invention is used.
FIGS. 4 to 7 show examples in which a synchronization signal and a broadcast signal are transmitted on a LCT (Legacy Carrier Type) carrier wave.
Figs. 8 to 13 show examples in which a reference signal is transmitted on an LCT carrier wave.
14 shows an example of transmission of a synchronizing signal and a reference signal in an LCT carrier wave, an asynchronous NCT carrier wave, and a sleeping mode supporting NCT carrier wave.
FIG. 15 shows a deployment scenario of the transmission / reception points and the terminal according to an exemplary embodiment of the present invention.
16 shows a layout scenario of the transmission / reception points and the terminal according to another example of the present invention.
FIG. 17 shows a deployment scenario of the transmission / reception points and the terminal according to another example of the present invention.
18 shows a deployment scenario of the transmission / reception points and the terminal according to another example of the present invention.
FIG. 19 is a flowchart schematically illustrating QCL signaling considering an NCT between a BS and a UE according to the present invention.
20 shows an example of a CoMP support method considering NCT in a base station according to the present invention.
FIG. 21 shows an example of a CoMP support method considering an NCT in a terminal according to the present invention.
22 is a block diagram schematically showing a base station and a terminal supporting CoMP in consideration of the NCT according to the present invention.

Hereinafter, some embodiments will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear.

The present invention will be described with reference to a communication network. The work performed in the communication network may be performed in a process of controlling the network and transmitting data by a system (e.g., a base station) that manages the communication network, The work can be done.

1 is a block diagram illustrating a wireless communication system to which the present invention is applied.

Referring to FIG. 1, a wireless communication system 10 is widely deployed to provide various communication services such as voice, packet data, and the like. The wireless communication system 10 includes at least one base station (BS) 11. Each base station 11 provides communication services for a particular geographical area or frequency domain and may be referred to as a site. A site may be divided into a plurality of areas 15a, 15b, and 15c, which may be referred to as sectors, and the sectors may have different cell IDs.

A terminal 12 may be fixed or mobile and may be a user equipment (UE), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, a PDA (personal digital assistant), a wireless modem, a handheld device, and the like. The base station 11 generally refers to a station that communicates with the terminal 12 and includes an evolved Node B (eNodeB), a base transceiver system (BTS), an access point, a femto base station (Femto eNodeB) (Home eNodeB: HeNodeB), a relay, a remote radio head (RRH), and the like. Cells 15a, 15b and 15c should be interpreted in a generic sense to denote a partial area covered by the base station 11 and include all coverage areas such as megacell, macrocell, microcell, picocell, femtocell It means.

Hereinafter, a downlink refers to a communication or communication path from the base station 11 to the terminal 12, and an uplink refers to a communication or communication path from the terminal 12 to the base station 11 . In the downlink, the transmitter may be part of the base station 11, and the receiver may be part of the terminal 12. In the uplink, the transmitter may be part of the terminal 12, and the receiver may be part of the base station 11.

There is no limit to the multiple access scheme applied to the wireless communication system 10. [ (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier-FDMA , OFDM-CDMA, and the like.

These modulation techniques increase the capacity of the communication system by demodulating signals received from multiple users of the communication system. The uplink transmission and the downlink transmission may be performed using a time division duplex (TDD) scheme transmitted at different times or a frequency division duplex (FDD) scheme using different frequencies.

The wireless communication system 10 may be a Coordinated Multi Point (CoMP) system. The CoMP system refers to a communication system that supports CoMP or a communication system to which CoMP is applied. CoMP is a technique for adjusting or combining signals transmitted or received by multiple transmission / reception points (Tx / Rx). CoMP can increase data throughput and provide high quality.

The transmission / reception point may be defined as an element carrier or a cell or a base station (macro cell, Pico eNodeB, Femto eNodeB, or the like), or a remote radio head (RRH). The transmission / reception point may also be defined as a set of antenna ports. The transmitting / receiving point may transmit information on the set of antenna ports to the terminal through radio resource control (RRC) signaling. Therefore, a plurality of transmission points (TPs) in one cell can be defined as a set of antenna ports.

Each base station or cell may comprise multiple transmit and receive points. For example, multiple transmit and receive points may be macro cells forming a homogeneous network. In addition, the multiple transmission / reception points may be macro cells and RRHs having high transmission power. In addition, the multiple transmit / receive points may be RRHs with low transmit power in macrocell and macrocell regions.

The CoMP system can selectively apply CoMP. A mode in which a CoMP system performs communication using CoMP is referred to as a CoMP mode, and a mode in which the CoMP system does not communicate is referred to as a normal mode or a non-CoMP mode.

The terminal 12 may be a CoMP terminal. The CoMP terminal is a component of the CoMP system, and performs communication with the CoMP Cooperating Set. Like the CoMP system, the CoMP terminal can operate in the CoMP mode or in the normal mode. The CoMP cooperative set is a set of transmit / receive points that directly / indirectly participate in data transmission in a certain time-frequency resource for CoMP terminals.

Direct participation in data transmission or reception means that the transmission / reception points actually transmit data to or receive data from the CoMP terminal in the corresponding time-frequency resource. Indirect participation in data transmission or reception implies that the transmission / reception points do not actually transmit data to or from the CoMP terminal in the corresponding time-frequency resource, but contribute to making decisions about user scheduling / beamforming .

CoMP terminals can simultaneously receive signals from a CoMP cooperative set or simultaneously transmit signals to a CoMP cooperative set. In this case, the CoMP system minimizes the interference influence among CoMP cooperative sets considering the channel environment of each cell constituting CoMP cooperative set.

Various scenarios are possible when operating the CoMP system. The first CoMP scenario may be referred to as intra-site CoMP, with CoMP being homogeneous among a number of cells in one base station. The second CoMP scenario is a CoMP consisting of one macrocell and a homogeneous network for one or more High-Power RRHs. The third CoMP scenario and the fourth CoMP scenario are CoMPs consisting of one macro cell and one heterogeneous network for one or more low-power RRHs in the macro cell region. In this case, if the physical cell ID of the RRHs is not the same as the physical cell ID of the macro cell, the third CoMP scenario corresponds to the fourth cell CoMP scenario.

The CoMP is classified into Joint Processing (JP) and Coordinated Scheduling / Beamforming (CS / CB), and JP And CS / CB can be mixed.

In the case of the JP, the data for the terminal is available at at least one send / receive point of the CoMP cooperative set at some time-frequency resource. JP includes Joint Transmission (JT) and Dynamic Point Selection (DPS).

JT refers to the simultaneous transmission of data from multiple transmission / reception points (multi-points) belonging to CoMP cooperation set to one terminal or a plurality of terminals in a time-frequency resource. In the case of JT, multiple cells (data transmission / reception points) transmitting data to one terminal perform transmission using the same time / frequency resource.

In the case of DPS, data transmission is performed from one transmission / reception point of the CoMP cooperative set in the time-frequency resource. Transmission / reception points may be changed for each subframe in consideration of interference. The data to be transmitted is available at a plurality of transmission / reception points simultaneously. DPS includes Dynamic Cell Selection (DCS).

In the case of CS, data is transmitted from one of the transmit and receive points in the CoMP cooperative set for time-frequency resources, where user scheduling is determined by coordination between the transmit and receive points of the CoMP cooperative set.

The CB is also determined by cooperation between the sending and receiving points of the CoMP cooperation set. Coordinated Beamforming (CB) can avoid interference with neighboring cell terminals.

The CS / CB may include an SSPS (Semi-Static Point Selection) which can change the transmission / reception point by semi-static selection.

As described above, it is also possible to mix JP and CS / CB. For example, some transmit / receive points within the CoMP cooperative set may transmit data to the target station according to the JP, and other transmit and receive points within the CoMP cooperative set may perform CS / CB.

The transmission / reception point to which the present invention is applied may include a base station, a cell or an RRH. That is, the base station or the RRH may be a transmission / reception point. On the other hand, a plurality of base stations may be multiplex transmission / reception points, and a plurality of RRHs may be multiplex transmission / reception points. Of course, the operations of all base stations or RRHs described in the present invention can be similarly applied to other types of transmission / reception points.

2 shows a structure of a subframe of a physical layer in a wireless communication system to which the present invention is applied.

Referring to FIG. 2, one radio frame includes ten subframes, and one subframe includes two consecutive slots. In the case of downlink, 1, 2, 3 or 4 OFDM symbols preceding the first slot in a subframe are control regions to which a physical downlink control channel (PDCCH) is mapped, and the remaining OFDM symbols Are data regions to which a physical downlink shared channel (PDSCH) is mapped. Control channels such as PCFICH and PHICH may be allocated to the control area in addition to the PDCCH. The UE can decode the PDCCH and read the data information transmitted on the PDSCH. The number of OFDM symbols that constitute the control channel region in the subframe can be known through the PCFICH. For example, when the system bandwidth is N ^DL _RB > 10, the PCFICH indicates the first one, two or three OFDM symbols as a control region, and when N ^DL _RB = 10, the PCFICH indicates the first two, , Three or four OFDM symbols are indicated as control areas.

The control information mapped to the PDCCH is referred to as downlink control information (DCI). DCI includes a modulation and coding scheme (MCS) field for indicating the modulation scheme of the PDSCH, an uplink or downlink resource allocation field, an uplink power control command field, A control field, a control field for indicating a random access response (RA response), and the like.

The DCI has different uses according to its format, and the fields defined in the DCI are different. Table 1 shows the DCI according to various formats.

DCI format Explanation 0 Used in scheduling of PUSCH (uplink common channel) in uplink cell One Used for scheduling one PDSCH codeword in one cell 1A Used for simple scheduling of one PDSCH codeword in one cell and in a random access procedure initiated by a PDCCH command. 1B Used for simple scheduling of one PDSCH codeword in one cell using precoding information 1C Used for brief scheduling of one PDSCH codeword and notification of MCCH changes 1D Used for simple scheduling of one PDSCH codeword in one cell, including precoding and power offset information. 2 Used for PDSCH scheduling for terminals configured in spatial multiplexing mode. 2A Used for PDSCH scheduling of UEs configured in CDD mode with large delay. 2B Used in transmission mode 8 (dual layer transmission, etc.) 2C Used in transmission mode 9 (multi layer transmission) 2D Used in transfer mode 10 (CoMP) 3 Used for transmission of TPC commands for PUCCH and PUSCH with 2-bit power adjustment 3A Used for transmission of TPC commands for PUCCH and PUSCH with single bit power adjustment. 4 Used for scheduling of PUSCH in multi-antenna port transmission mode cell for uplink

Referring to Table 1, the DCI format includes a format 0 for PUSCH scheduling in a UL cell, a format 1 for scheduling one PDSCH codeword, a format 1A for compact scheduling of one PDSCH codeword, a DL- SCH for very simple scheduling, Format 2 for PDSCH scheduling in a closed-loop spatial multiplexing mode, Format 2A for PDSCH scheduling in an open-loop spatial multiplexing mode, A format 2B used in a transmission mode (TM) 8, a format 2C used in a transmission mode 9, a format 2D used in a transmission mode 10, a format for transmission of a transmission power control (TPC) command for an uplink channel 3 and 3A, and a format 4 for PUSCH scheduling in a multi-antenna port transmission mode for an uplink.

Each field of the DCI is sequentially mapped to _n information bits a ₀ through a _{n -1} . For example, if the DCI is mapped to a total of 44 bits of information bits, each DCI field is sequentially mapped to a ₀ to a ₄₃ . DCI formats 0, 1A, 3, and 3A may all have the same payload size. DCI formats 0 and 4 may also be referred to as uplink grants.

FIG. 3 shows a structure of an uplink / downlink slot in a wireless communication system to which the present invention is applied.

Referring to FIG. 3, one subframe is composed of two slots as described above. A slot may contain a plurality of symbols in the time domain. For example, in the case of a wireless system using Orthogonal Frequency Division Multiple Access (OFDMA) in the downlink, the symbol may be an Orthogonal Frequency Division Multiplexing (OFDM) symbol. On the other hand, in a radio system using a single carrier transmission scheme based on a Discrete Fourier Transform-Spread OFDM (DFTS-OFDM) scheme in the uplink, the symbol may be a DFTS-OFDM symbol. The single carrier transmission scheme based on DFTS-OFDM can be called SC-FDMA (Single Carrier Frequency Division Multiple Access), and the DFTS-OFDM symbol can be called SC-FDMA symbol.

On the other hand, the representation of the symbol period of the time domain is not limited by the multiple access scheme or the name. For example, in a time domain, a plurality of symbols may be a single-carrier-frequency division multiple access (SC-FDMA) symbol, a symbol period, etc. in addition to an OFDM symbol.

The number of OFDM symbols or SC-FDMA symbols included in one slot may vary according to the length of CP (Cyclic Prefix). For example, one slot may include seven symbols in the case of a normal CP, and one slot may include six symbols in the case of an extended CP.

One slot includes a plurality of subcarriers in the frequency domain and includes seven OFDM symbols or SC-FDMA symbols in the time domain. A resource block (RB) is a resource allocation unit. If a resource block includes 12 subcarriers in the frequency domain, one resource block may include 7 * 12 resource elements (REs). The resource block may be referred to as a PRB (Physical Resource Block).

The resource element represents the smallest frequency-time unit to which the modulation symbol of the data channel or the modulation symbol of the control channel is mapped. If there are M subcarriers on one OFDM symbol and one slot includes N OFDM symbols, one slot includes M * N resource elements. Similarly, if there are M subcarriers on one SC-FDMA symbol and one slot includes N SC-FDMA symbols, one slot includes M * N resource elements.

FIGS. 4 to 7 show examples in which a synchronization signal and a broadcast signal are transmitted on a LCT (Legacy Carrier Type) carrier wave. In particular, FIG. 4 illustrates intra-frame sync signals and broadcast signal resources having a normal CP in the FDD mode, and FIG. 5 illustrates sync signals and broadcast signal resources in a wireless frame having an extended CP in the FDD mode. FIG. 6 illustrates an intra-frame synchronization signal and a broadcast signal resource having a normal CP in the TDD mode, and FIG. 7 illustrates an intra-frame synchronization signal and a broadcast signal resource having an extended CP in the TDD mode.

The terminal performs an initial cell search operation such as synchronizing with a base station when the power is turned on or a new cell is entered. To this end, the mobile station receives a synchronization signal, for example, a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from a base station, synchronizes with the base station and transmits information such as a cell identifier Can be obtained. Then, the terminal can receive a broadcast signal, for example, a physical broadcast channel (PBCH) from the base station, and obtain in-cell broadcast information.

Referring to FIG. 4 to FIG. 7, the synchronization signal and the broadcast signal will be described in more detail as follows.

The synchronization signal is divided into PSS and SSS. PSS is used to obtain time domain synchronization and / or frequency domain synchronization such as OFDM symbol synchronization and slot synchronization, and SSS is used for frame synchronization, cell group ID and / or cell CP configuration (i.e., use of normal CP or extended CP Information). 4 to 7, the PSS and the SSS are transmitted in two OFDM symbols of each radio frame, respectively. Also, the PSS and the SSS are transmitted on six RBs, three in the left and right, around the DC subcarrier in the corresponding OFDM symbol.

The PBCH includes basic system information for communication. Specifically, the contents of the PBCH message are represented by a master information block (MIB) in the RRC layer. The PBCH includes a downlink system bandwidth (DL BW: DL-Bandwidth), a PHICH setting, and a system frame number (SFN: System Frame Number). Accordingly, the UE can explicitly inform the DL BW, SFN, and PHICH setting by receiving the PBCH. Meanwhile, the UE can implicitly know the number of transmission antenna ports of the base station through the PBCH reception.

The encoded PBCH is mapped to 4 subframes for 40 ms as shown in FIG. 4 to FIG. The 40ms timing is blind detected and there is no explicit signaling for it. The PBCH maps to four OFDM symbols and six RBs. In the time domain, the PBCH is transmitted in OFDM symbols 0-3 of the second slot of the first subframe in the radio frame. On the other hand, in the frequency domain, the PBCH is mapped only to 72 central subcarriers regardless of the actual system bandwidth. That is, it is transmitted on six RBs, three left and right, around a DC (Direct Current) subcarrier left unused.

Meanwhile, in a wireless communication system, it is necessary to estimate an uplink channel or a downlink channel for data transmission / reception, system synchronization acquisition, channel information feedback, etc., and compensates for signal distortion caused by a sudden change in environment. The process of restoring the signal is called channel estimation. It is also necessary to measure the channel state of the cell or other cell to which the terminal belongs. Generally, a transceiver uses a reference signal (RS) known to each other for channel estimation or channel state measurement.

Figs. 8 to 13 show examples in which a reference signal is transmitted on an LCT carrier wave.

The downlink reference signal includes a cell-specific RS (CRS), a mobile broadcast single frequency network (MBSFN) reference signal, a UE-specific RS, a positioning RS (PRS) And a CSI (Channel State Information) reference signal (CSI-RS).

A multi-antenna system basically requires a plurality of physically configured antennas. There may be logically separated antenna ports defined on the basis of transmitted data and signals. The resource element used for the reference signal of one antenna port is not used for the reference signal of another antenna port. This is to avoid interference between antennas transmitting different reference signals. For example, each antenna port may have a 1: 1 mapping relationship with a physical antenna so that only one reference signal is transmitted per antenna. Also, the antenna port may have a mapping relationship of 1: 1 or 1: n with the physical antenna. For example, if there are four physical antennas set for transmission to the base station or the terminal, the number of logically configurable antenna ports may be one, two, or four. If the number of antenna ports is one, the antenna port has a mapping relationship with four physical antennas. Also, if the number of antenna ports is two, each antenna port may have a mapping relationship with one to three physical antennas among four physical antennas. At this time, the total number of physical antennas mapped to all of the antenna ports can not exceed the total number of physical antennas.

The CRS is used for channel estimation as a reference signal transmitted to all UEs in a cell. The CRS may be transmitted in all downlink subframes within a cell supporting PDSCH transmission.

A UE-specific reference signal is a reference signal received by a specific UE or a specific UE group in a cell, and may be referred to as DMRS (Demodulation RS) since it is mainly used for data demodulation of a specific UE or a specific UE group.

The MBSFN reference signal is a reference signal for providing a Multimedia Broadcast Multicast Service (MBMS), and can be transmitted in a subframe allocated for MBSFN transmission. The MBSFN reference signal can be defined only in the extended CP structure.

The PRS can be used for position measurement of the UE. The PRS can be transmitted only through the resource blocks in the DL subframe allocated for the PRS transmission.

The CSI-RS may be used for estimation of channel state information. The CSI-RS is arranged in a frequency domain or a time domain. The CSI-RS may be configured to estimate a channel state using a CSI-RS and to transmit a channel quality indicator (CQI), a precoding matrix indicator (PMI) A rank indicator (RI) or the like may be reported from the terminal as channel state information. The CSI-RS may be transmitted on one or more antenna ports. For example, the CSI-RS may be transmitted using not only one antenna port but also two antenna ports, four antenna ports, eight antenna ports or the like under MIMO operation.

In the CoMP system, a plurality of cells or transmission / reception points can transmit a reference signal, for example, a CSI-RS to a UE. In this case, CSI-RSs using different resources from different transmission / reception points to one terminal can be transmitted. In the CoMP system, the reference signal sequence may be cell-specific determined. In particular, in a CoMP environment in which a cell ID of a transmission / reception point (for example, RRHs) cooperating with a specific transmission / reception point (for example, a macro cell) is equal to each other, A sequence may be used to generate the reference signal. This means that all the transmission / reception points (for example, RRHs) belonging to the same cooperative set as the macro cell transmit reference signals using the same reference signal sequence.

FIG. 8 schematically shows that CRS is mapped to RE in the case of a regular CP (Cyclic Prefix).

Referring to FIG. 8, R _p denotes an RE used for CRS transmission at the antenna port P. For example, R ₀ represents the RE used for CRS transmission at antenna port 0, and R ₁ represents the RE used for CRS transmission at antenna port 1.

Also, FIG. 9 schematically shows that CRS is mapped to RE in the case of the extended CP.

As shown in FIGS. 8 and 9, the CRS is mapped to the RE in a predetermined pattern every subframe.

10 schematically shows that the DMRS is mapped to RE in the case of a regular CP (Cyclic Prefix).

Referring to FIG. 10, R _p denotes an RE used for DMRS transmission at the antenna port P. For example, R ₇ represents RE used for DMRS transmission at antenna port 7, and R ₈ represents RE used for DMRS transmission at antenna port 8. Even in the same antenna port, RE used for DMRS transmission may be changed according to a special subframe configuration.

11 schematically shows that the DMRS is mapped to the RE in the case of the extended CP.

As shown in Figs. 10 and 11, the DMRS is mapped to RE in a predetermined pattern.

12 schematically shows an example of a downlink frame structure in which a CSI-RS is mapped to an RE in the case of a normal CP. Also a mapping of the CSI-RS shown in Figure 12 is an example of the configuration CSI (CSI configuration) 0 for the normal CP, R _p represents an RE which is used to CSI-RS transmitted from antenna port P. For example, R ₁₅ represents RE used for CSI-RS transmission at antenna port 15, and R ₁₆ represents RE used for CSI-RS transmission at antenna port 16.

Also, FIG. 13 schematically shows an example in which the CSI-RS is mapped to the RE in the case of the extended CP. The mapping of the CSI-RS shown in FIG. 13 relates to the CSI configuration 0 for the extended CP.

As shown in FIGS. 12 and 13, the CSI-RS can be mapped to a RE in a predetermined pattern according to an antenna port to be transmitted.

On the other hand, in a multi-element carrier system supporting a Carrier Aggregation (CA) and a CoMP system supporting multi-cell (or point) cooperative communication, all the carriers are transmitted in the physical layer, PBCH) and reference signals are transmitted and received, the data area to be transmitted is relatively reduced due to unnecessary transmission of the control signal, which is inefficient.

To solve this problem, a new carrier type (NCT) can be used. The NCT may not transmit signals such as PBCH, PDCCH, PHICH, and PCFICH, for example. The NCT may not support transmission modes (TM) 1 to 8. That is, TM9 or TM10 can be supported in NCT. Up to 8 layers can be supported in NCT and DCI formats 1A and 2C (TM9) or 2D (TM10) can be used for PDSCH transmission on NCT. The DCI formats 1A and / or 2D (or 2C, depending on the configured TM mode) may be indicated via ePDCCH (enhanced PDCCH) on the NCT and may be indicated via cross-carrier scheduling from the LCT.

Specifically, the NCT may include a non-standalone NCT, a standalone NCT, a macro-assisted NCT, and a dormant mode-assisted NCT.

First, a non-standalone NCT is an NCT that can not exist in a single cell form and can exist in the form of a secondary serving cell if there is a main serving cell. For example, when a legacy carrier type (LCT) is set as a main serving cell in a terminal in which a CA is set, non-standalone NCT secondary serving cells can be clustered together.

A non-standalone NCT can be divided into a synchronized NCT and an asynchronized NCT.

Synchronous NCT means an NCT operating with reference to the synchronization of another carrier (e.g., a legacy carrier). In other words, the synchronous NCT may be synchronized with other carriers in terms of time and frequency to indicate a case where a separate synchronization procedure is not required in the terminal. The synchronous NCT may not transmit PSS, SSS and CRS (and TRS, as described below). This allows overhead reduction of common RSs. In the synchronous NCT, there may be advantages such as interference mitigation, energy saving, and imporved spectral efficacy for the adjacent cell due to the reduction of the overhead, and due to the reduction of the public RSs A network provider can use a frequency band more flexibly.

An asynchronous NCT is an NCT that can operate independently by acquiring independent synchronizations independent of other carriers (eg, legacy carriers). In this case, the asynchronous NCT transmits the same PSS and SSS as the legacy carrier type, but the CRS transmission frequency may be low. For example, in an asynchronous NCT, a CRS may be transmitted with a certain period, in which case the CRS may be referred to as reduced CRS (reduced CRS) or TRS (Tracking RS). Specifically, for example, the TRS may be transmitted using a CRS antenna port 0 based and a Rel-8 sequence with a 5 ms period on the time axis. The TRS can be transmitted in the entire system bandwidth on the frequency axis, or only in some system bandwidths. In this case, the CSI-RS is also transmitted.

Second, the standalone NCT is an NCT that can exist in a single cell form. For example, a standalone NCT can exist in the form of a main serving cell. Standalone NCT can be removed CRS. Accordingly, the existing PDCCH, PHICH, and PCFICH, which are CRS-based control channels, can be removed or replaced with other types of channels. Demodulation of ePDCCH and PDSCH in Standalone NCT can be performed based on DMRS.

Third, the macro-assisted NCT performs the initial cell entry procedure and the handover procedure through the LCT carrier, and once the RRC is connected, the macro-assisted NCT carrier carries the carrier type that performs the entry through the handover or other methods It can mean. Therefore, compared with the stand-alone NCT, there is no need to newly define methods such as a new cell entry procedure and a handover procedure. Other PDCSH and ePDCCH-related ones can be used in the same way as existing definitions. Macro-assisted NCTs can be treated according to their nature in accordance with non-standalone NCTs or standalone NCTs. For example, in the macro-assisted NCT, it is similar to the non-standalone NCT in that it is performed through the LCT carrier in the initial cell entry procedure and the like, It can be handled similarly to a standalone NCT.

Fourth, the sleep mode support NCT means an NCT that can enter the on (active), off (sleep) state (or mode), as the case may be. Sleep Mode Support If the NCT is in sleep mode, it can be called a dormant NCT. For example, the sleep mode supported NCT may be operated in an active or sleep mode depending on the traffic condition. That is, the base station can turn off power to the sleep mode supported NCT cell according to the traffic requirements of the terminal, thereby saving energy and reducing cell interference. When the sleep mode supporting NCT is in the sleep mode, the base station can transmit only the cell identification signal (e.g., PSS / SSS) of a longer period without transmitting the CRS to transmit the minimum signal to the mobile station. In this case, the cell identification signal may be called a DS (Discovery Signal).

14 shows an example of a synchronization signal and a reference signal transmission in the LCT, the asynchronous NCT, and the sleep mode supported NCT.

Referring to FIG. 14, (a) shows that the CRS is transmitted in every subframe in the LCT, and the cell identification signal is periodically transmitted every fifth slot. For example, the cell identification signal may be PSS and SSS. (b) shows that the CRS is transmitted in the asynchronous NCT at a cycle of 5 ms. In this case, the periodically transmitted CRS may be referred to as reduced CRS or TRS (Tracking RS) as described above. The cell identification signal is periodically transmitted in the same manner as the LCT. (c) shows that the cell identification signal is periodically transmitted without the CRS transmission when the sleep mode supporting NCT is in the sleep mode. The sleep mode supporting NCT is operated with the LCT of (a) It can be operated with asynchronous NCT and CA.

FIG. 15 shows a deployment scenario of the transmission / reception points and the terminal according to an exemplary embodiment of the present invention. 15 shows a case where a cell of an asynchronous NCT is connected to a terminal.

15, the terminal 1550 is located at the cell site of the macro base station 1500, and is also located at the cell sites of the LPN1 (low power node 1, 1510) and LPN2 (1520). 15, it is assumed that the cell of the macro base station 1500 is a backward compatible carrier type (BCCT), that is, the LCT, and the cells of LPN1 1510 and LPN2 1520 are NCTs. Here, the cell of the macro base station 1500 uses the frequency band f1 as the main serving cell, and the cells of the LPN1 1510 and the LPN2 1520 use the frequency band f2 as the secondary serving cells.

In this scenario, TRS and PSS / SSS can be sent from the LPN1 1510 and the LPN2 1520 to the terminal 1550 if the carrier type of the LPN1 1510 cell and the LPN2 1520 cell is an asynchronous NCT. The cells of the macro base station 1500 may provide full backward compatibility to existing standards.

The macro base station 1500 is connected to the LPN1 1510 and the LPN2 1520 via a backhaul. The intra-site (or intra-base station) CoMP scheme may be applied if the macro base station 1500 is connected to the LPN1 1510 and the LPN2 1520 through an ideal backhaul, An inter-site (or inter-base station) CoMP technique may be applied when the packet is connected to the LPN1 1510 and the LPN2 1520 through a non-ideal backhaul. Here, an ideal backhaul is a case where a delay of a signal through a backhaul is less than a certain level. For example, if the delay is smaller than a cyclic prefix (CP), the backhaul can be regarded as an ideal backhaul.

Meanwhile, the terminal (i.e., the CoMP terminal) in which the TM 10 is set transmits the upper layer signaling and / or the lower layer signal to instruct the terminal about the hypothesis on the characteristics of the channel experienced by the antenna ports between the antenna ports 0 to 3 and 7 to 22, Or quasi co-location (QCL) types via DCI 2D messages. For example, large-scale properties of a channel over a conveyed symbol at one of the two antenna ports may be transmitted to a single antenna at another antenna port, If the symbol can be estimated from the channel over which it is transmitted, it can be said that the two antenna ports are quasi co-loacated. Here, the large-scale channel characteristics include one or more of a delay spread, a Doppler spread, a Doppler shift, an average gain, and an average delay. .

The QCL type may include QCL type A, QCL type B. When set to QCL type A, the terminal may assume that the antenna ports 0 to 3, 7 to 22 of the serving cell conform to the same place placement in terms of delay spread, Doppler spread, and average delay with respect to.

When set to the QCL type B, the terminal transmits PDSCH RE mapping in the DCI format 2D, scheduling the PDSCH transmission, and antenna ports corresponding to the CSI-RS resource configuration through a Quasi Co-Location (QCL) 15-22, and antenna ports 7-14 associated with PDSCH decoding correspond to the same place placement in terms of Doppler shift, Doppler spread, average delay, and delay spread. In this case, the CSI-RS resource configuration can be identified by the CSI-RS resource configuration identifier for the PDSCH RE mapping. In order to signal the QCL definition between the CRS ports 0-3 and the CSI-RS ports 15 to 22, information including the corresponding CRS ports 0-3 is specified in the CSI-RS resource setting information indicating the corresponding CSI-RS ports .

In addition, the UE with CoMP can receive data through any base station (or transmission / reception point) constituting the CoMP cooperation set. In this case, the UE can receive data from each base station (or transmission / reception points) The physical layers may have different data and signal mapping structures. Therefore, in this case, the UE needs to acquire the PDSCH RE mapping and the PDSCH antenna port QCL information in order to smoothly receive and decode the PDSCH from the different transmission points. Specifically, when the DCI mapped to the PDCCH (or E (enhanced) PDCCH) indicates the DCI format 1A or the DCI format 2D in Table 1, the UE having the TM10 set transmits the PDSCH RE mapping, the PDSCH RE mapping, The PDSCH RE mapping and the PDSCH QCL indicator field as shown in Table 2 below are selected and set through the upper layer signaling for determining the port QCL.

Referring to Table 2, the DCI includes a PDSCH RE mapping field and a PDSCH QCL indicator field in the case of the format 2D, and indicates a different parameter set according to the value of the field. The parameters included in each parameter set can be set by the upper layer.

In this case, the parameters included in the respective parameter sets include 'number of CRS antenna ports for PDSCH RE mapping', 'CRS frequency shift (or v-shift) for PDSCH RE mapping', ' , 'PDSCH RE subframe setting', 'Zero-power CSI-RS resource setting for PDSCH RE mapping', 'PDSCH starting position for PDSCH RE mapping', and 'CSI for PDSCH RE mapping' -RS resource setting identity ".

The parameters may be referred to as PDSCH resource mapping parameters and may be used to determine the PDSCH RE mapping and the PDSCH antenna port QCL.

However, as described above, when the CRS is not transmitted from the base station to the mobile station (for example, in case of synchronous NCT), TRS is transmitted instead of CRS (for example, in case of asynchronous NCT) (For example, in the case of dormant NCT) may be transmitted. In such a case, the parameters alone may be insufficient to determine the PDSCH RE mapping and the PDSCH antenna port QCL. Therefore, it is necessary to define and signal additional parameters in order to perform a more appropriate CoMP operation on the NCT cell.

For example, when the UE having the TM10 (CoMP) is connected to the cell of the asynchronous NCT as described above with reference to FIG. 15, the parameter for the TRS subframe information may be further included in the PDSCH resource mapping parameters. In this case, a parameter for the TRS bandwidth may be further included. Here, if the TRS subframe information is determined based on the cell ID, the TRS subframe information can be represented through qcl-ScramblingIdentity information or v_shift information. Here, the qcl-ScramblingIdentity information is information directly indicating the cell ID, and the v-shift information is indirectly indicating the cell ID since the CRS is mapped to the physical layer in the frequency axis and is shifted according to the cell ID.

That is, in this case, the PDSCH resource mapping parameters that can be included in each parameter set described in Table 2 are 'number of CRS antenna ports for PDSCH RE mapping', 'CRS frequency shift (or v-shift (ZP) CSI-RS resource setup for PDSCH RE mapping, PDSCH start position for PDSCH RE mapping, PDSCH RE mapping for PDSCH RE mapping, and MBSFN subframe setup for PDSCH RE mapping. CSI-RS resource setting identifier ',' TRS sub-frame information for PDSCH RE mapping ', and' TRS transmission bandwidth for PDSCH RE mapping '. If the TRS subframe information is determined based on the cell ID, the 'TRS subframe information for PDSCH RE mapping' parameter includes 'qcl-ScramblingIdentity information for PDSCH RE mapping' or 'v_shift information for PDSCH RE mapping' Parameter. ≪ / RTI >

Meanwhile, parameters included in each of the parameter sets described above in Table 2 are set through upper layer signaling. For example, when the parameters are set through RRC signaling, an RRC message may include the following syntax .

PDSCH-RE-MappingQCL-Config-rxx :: = SEQUENCE {
pdsch-RE-MappingQCL-ConfigId-rxx PDSCH-RE-MappingQCL-ConfigId-rxx,
optionalSetOfFields-rxx SEQUENCE {
crs-PortsCount-rxx ENUMERATED {n1, n2, n4, spare1},
crs-FreqShift-rxx INTEGER (0..5),
trs - Subframe ENUMERATED {n0, n1, n2, n3, n4} or scmrablingIdentity or v_shift value
trs - Transmission BW
mbsfn-SubframeConfig-rxx MBSFN-SubframeConfig OPTIONAL, - Need OR
pdsch-Start-rxx ENUMERATED {reserved, n1, n2, n3, n4, assigned}
} OPTIONAL, - Need OP
csi-RS-IdentityZP-rxx CSI-RS-IdentityZP-rxx,
qcl-CSI-RS-IdentityNZP-rxx CSI-RS-IdentityNZP-rxx OPTIONAL, - Need OR
...
}

Referring to Table 3, the RRC connection re-establishment message may include a PDSCH-RE-MappingQCL-Config field. Specifically, the RRC connection re-establishment message includes a PDSCH-Config information element, and the PDSCH-Config information element may include a PDSCH-RE-MappingQCL-Config field. For the serving frequency, the E-UTRAN may include at least one PDSCH-RE-Mapping QCL-Config field if the transmission mode TM 10 (i.e. CoMP) is set in the serving cell of the corresponding frequency. In other words, the PDSCH-RE-MappingQCL-Config field may be included in the RRC connection re-establishment message transmitted from the base station to the UE when CoMP is set.

The PDSCH-RE-Mapping QCL-Config field may include parameters included in each of the parameter sets described in Table 2 above.

Specifically, the PDSCH-RE-MappingQCL-Config field may include a pdsch-RE-MappingQCL-ConfigId subfield, an optionalSetOfFields subfield, a csi-RS-IdentityZP subfield, and a qcl-CSI-RS-IdentityNZP subfield.

The psi-RE-MappingQCL-ConfigId subfield is used to identify a set of parameters for the PDSCH resource mapping parameters, and the csi-RS-IdentityZP subfield is used for zero-power (ZP) CSI- Parameter, and the qcl-CSI-RS-IdentityNZP subfield indicates a CSI-RS resource setting identifier parameter for PDSCH RE mapping. The qcl-CSI-RS-IdentityNZP subfield may be set only when the UE is set to the QCL type B described above.

The optionalSetOfFields subfield includes crs-PortCount information indicating the number of CRS antenna ports for PDSCH RE mapping, crs-FreqShift information indicating a parameter for CRS frequency shift for PDSCH RE mapping, MBSFN sub-frame for PDSCH RE mapping, SubframeConfig information indicative of a parameter for setting, as well as trs-Subframe information indicating a parameter for TRS subframe information for PDSCH RE mapping and TRS for PDSCH RE mapping in consideration of NCT as described above, And trs-Transmission BW information indicating a parameter for the transmission bandwidth. On the other hand, when the TRS subframe information is determined based on the cell ID, the trs-Subframe information may be replaced with scramblingIdentity information or v_shift information.

16 shows a layout scenario of the transmission / reception points and the terminal according to another example of the present invention. 16 shows a case where a cell of a synchronous NCT is connected to a terminal.

Referring to FIG. 16, in (a), a terminal 1650 has a case where carrier aggregation of a macro base station 1600 is set. (a), a cell using the frequency band f1 is a BCCT (i.e., LCT), and a cell using the frequency band f2 is a synchronous NCT. In this case, TRS and PSS / SSS can be set not to be transmitted from the base station 1600 to the terminal 1660 in the cells of the synchronous NCT. Therefore, even if TM10 and QCL type B are set, the terminal 1650 can not synchronize the CSI-RS and the DMRS on the same synchronous NCT because there is no TRS as well as the CRS on the synchronous NCT cell. The information is unclear.

Also, in (b), the terminal 1650 is connected to the cells of the macro base station 1600 and also to the cells of the LPN1 1610 and the cells of the LPN2 1620. [ the cell of the macro base station 1600 is the BCCT (i.e., LCT), and the cells of the LPN1 1610 and the LPN2 1620 are the asynchronous NCT and the cell of the LPN2 1620 is the synchronous NCT. Here, it can be assumed that the cell of f3 in which the synchronous NCT operated by LPN1 / 2 (1610, 1620) is deployed is synchronized to the cell of f2 in which the asynchronous NCT is deployed. In such a case, TRS and PSS / SSS can be set not to be transmitted on the cells of the LPN1 / 2 (1610 and 1620) using the frequency band f3. Therefore, even if TM10 and QCL type B are set, the terminal 1650 can not synchronize CSI-RS and DMRS because there is no CRS as well as TRS on the cells of LPN1 / 2 (1610 and 1620) The information is unclear.

However, in the above case (a), the QCL signal of the current (rel-11) in the view of the QCL assumption of the antenna ports (i.e., the CSI-RS port 15-22 and the CRS ports 0-3) (Through the BCCT cell of the macro base station) the setting of the qcl-CRS information in the CSI-RS resource configuration for the synchronous NCT cell). That is, for example, the cell ID information for the CRS transmitted from the BCCT (or LCT) cell of the macro base station 1600 is added to the CSI-RS resource setting information for the synchronous NCT cell, And the CSI-RS port 15-22 of the synchronous NCT cell is signaled to the terminal 1650 that the QCL has been performed. In this case, the UE needs to acquire the PDSCH RE mapping and the PDSCH antenna port QCL information.

On the other hand, in the case of (b) above, the QCL signaling proposed above (i.e., the CSI-RS resource setting on the synchronous NCT) in the view of the QCL hypothesis of the antenna ports (i.e., CSI- RS port 15-22 and CRS port 0-3) (From the asynchronous NCT) to the qcl-TRS information in the network. That is, for example, the cell ID information, the TRS subframe information, the mbsfn subframe information, and the TRS transmission bandwidth for the TRS transmitted from the asynchronous NCT cell of the LPN1 / 2 base station are stored in the CSI-RS resource setting information for the synchronous NCT cell And signaling to the terminal 1650 that the TRS port on the asynchronous NCT on the LPN1 / 2 and the CSI-RS port 15-22 of the synchronous NCT cell are QCLed.

Since the TRS (and CRS) and the PSS / SSS may not be transmitted from the base station to the UE in the synchronous NCT, information indicating the presence or absence of the TRS (and CRS) in the parameters included in each of the above- (Parameters), and may also include information (parameters) indicating whether the PSS / SSS is also present.

In this case, the RRC message may include the following syntax.

PDSCH-RE-MappingQCL-Config-rxx :: = SEQUENCE {
pdsch-RE-MappingQCL-ConfigId-rxx PDSCH-RE-MappingQCL-ConfigId-rxx,
optionalSetOfFields-rxx SEQUENCE {
crs-PortsCount-rxx ENUMERATED {n1, n2, n4, n0 (spare1)},
crs-FreqShift-rxx INTEGER (0..5),
mbsfn-SubframeConfig-rxx MBSFN-SubframeConfig OPTIONAL, - Need OR
pdsch-Start-rxx ENUMERATED {reserved, n1, n2, n3, n4, assigned}
PSS / SSS True / False
} OPTIONAL, - Need OP
csi-RS-IdentityZP-rxx CSI-RS-IdentityZP-rxx,
qcl-CSI-RS-IdentityNZP-rxx CSI-RS-IdentityNZP-rxx OPTIONAL, - Need OR
...
}

Referring to Table 4, the optionalSetOfFields subfield of the PDSCH-RE-MappingQCL-Config field includes crs-PortsCount information and PSS / SSS information.

If the crs-PortsCount information indicates n0, it may indicate that TRS (and CRS) are not present. Also, if the PSS / SSS indicates a False value, it can indicate that the PSS / SSS is absent.

Meanwhile, as shown in Table 4, an identifier for discriminating whether the synchronous NCT or the asynchronous NCT is added without including the information indicating the existence of the TRS (and the CRS) and the presence of the PSS / SSS, The RRC message including the trs-Subframe information and / or the trs-Transmission BW information of Table 3 is transmitted from the base station to the mobile station, and in the case of the synchronous NCT, the TRS And CRS) are absent and the PSS / SSS is absent.

FIG. 17 shows a deployment scenario of the transmission / reception points and the terminal according to another example of the present invention. 17 shows a case where a cell of a standalone NCT is connected to a terminal.

17, the terminal 1750 is connected to the cell of the macro base station 1700, and is also connected to the cell of the LPN1 1710 and the cell of the LPN2 1720. [ All of the cells use the frequency band f1. Here, the cell of the macro base station 1700 is a BCCT (i.e., LCT), and the cell of the LPN1 1710 and the cell of the LPN2 1720 are stand-alone NCTs.

Also in this case, the signaling method proposed in the present invention can be used to represent the QCL hypothesis between the antenna ports, the PDSCH RE mapping, and the PDSCH antenna port QCL information. That is, when the UE 1750 is connected to the stand-alone NCT cell, the macro BS 1700 includes TRS setting information in the CSI-RS resource setting information element of the RRC message transmitted to the UE, and the parameter for the PDSCH resource mapping parameters TRS configuration information may be included in the set.

18 shows a deployment scenario of the transmission / reception points and the terminal according to another example of the present invention. 18 shows a case where a sleep mode supporting NCT cell is connected to a terminal.

Referring to FIG. 18, in (a), a terminal 1850 is connected to a cell of a macro base station 1800, and also to a cell of LPN1 1810 and a cell of LPN2 1820. [ All of the cells use the frequency band f1. Here, the cell of the macro base station 1800 is a BCCT (i.e., LCT), and the cell of LPN1 1810 and the cell of LPN2 1820 are a sleep mode supporting NCT cell. (b), the cell of the macro base station 1800 uses the frequency band f1, and the cell of the LPN1 1810 and the cell of the LPN2 1820 are different from (a) in that the frequency band f2 is used. From the viewpoint of the terminal 1850, however, the CA can be set in (b).

In the example of FIG. 18, the sleep mode supported NCT cell does not transmit the CRS (and TRS) to the terminal 1850 for energy saving in the sleep mode, but only a longer period of the cell identification signal (e.g., PSS / SSS) To the terminal 1850. In this case, the cell identification signal may be called a DS (Discovery Signal). That is, the DS may be transmitted to the terminal 1850 at any time, regardless of whether the sleep mode supported NCT cell is in the active mode or the sleep mode, and may be used for synchronization purposes. In other words, the TRS transmitted for asynchronous NCT synchronization purposes may not be transmitted on the NCT with sleep mode. Therefore, the DS resource configuration must be included on each CSI-RS resource for the sleep mode supported NCT cells connected to the terminal 1850 and signaled from the base station to the terminal.

That is, when the UE with TM10 (CoMP) is connected to the idle mode supporting NCT cell, the PDSCH resource mapping parameters may include parameters for DS setting information. Specifically, the DS setting information may include at least one of information indicating the cell ID, information indicating a subframe period and offset at which the DS is transmitted, and information indicating the number of antenna ports to which the DS is mapped.

In this case, the RRC message may include the following syntax.

PDSCH-RE-MappingQCL-Config-rxx :: = SEQUENCE {
pdsch-RE-MappingQCL-ConfigId-rxx PDSCH-RE-MappingQCL-ConfigId-rxx,
optionalSetOfFields-rxx SEQUENCE {
crs-PortsCount-rxx ENUMERATED {n1, n2, n4, spare1},
crs-FreqShift-rxx INTEGER (0..5),
ds - ScramblingIdentity - rxx
ds - SubframePrioicity - rxx
ds - SubframeOffset - rxx
ds - PortsCount - rxx
mbsfn-SubframeConfig-rxx MBSFN-SubframeConfig OPTIONAL, - Need OR
pdsch-Start-rxx ENUMERATED {reserved, n1, n2, n3, n4, assigned}
} OPTIONAL, - Need OP
csi-RS-IdentityZP-rxx CSI-RS-IdentityZP-rxx,
qcl-CSI-RS-IdentityNZP-rxx CSI-RS-IdentityNZP-rxx OPTIONAL, - Need OR
...
}

Referring to Table 5, the optionalSetOfFields subfield of the PDSCH-RE-MappingQCL-Config field includes ds-ScramblingIdentity information, ds-SubframePrioicity information, ds-SubframeOffset information, and ds-PortsCount information.

The ds-ScramblingIdentity information indicates the ID of the corresponding sleep mode supporting NCT cell transmitting the DS. The ds-SubframePrioicity information indicates a period of a subframe in which the DS is transmitted. The ds-SubframeOffset information indicates an offset of a subframe indicating how many subframes the DS is transmitted. The ds-PortsCount information indicates the number of antenna ports to which the DS is transmitted. The ds-PortsCount information may be included in the optionalSetOfFields subfield only when the DS is transmitted through multiple antenna ports.

FIG. 19 is a flowchart schematically illustrating QCL signaling considering an NCT between a BS and a UE according to the present invention.

Referring to FIG. 19, the base station generates an RRC Connection Reconfiguration (RRC Connection Reconfiguration) message regarding TM10 (i.e., CoMP) configuration including an NCT cell and transmits the RRC Connection Reconfiguration message to the mobile station in operation S1900. In this case, the BS transmitting the RRC connection re-establishment message to the MS may be a macro base station. Here, the RRC connection re-establishment message may include CoMP configuration information, and may include information on a specific PDSCH RE mapping and QCL that are specific to the NCT cell connected to the UE according to the CoMP configuration. The information on the PDSCH RE mapping and the QCL includes a parameter set for the PDSCH RE mapping and the QCL including PDSCH resource mapping parameters peculiar to the NCT cell connected to the UE according to the CoMP setting.

For example, when the cell connected through the CoMP setting to the UE is an asynchronous NCT cell, the parameter for the TRS subframe and the parameter for the TRS bandwidth of the asynchronous NCT cell are allocated to the PDSCH resource mapping parameters indicated in the RRC connection re- . That is, the parameter for the TRS subframe and the parameter for the TRS bandwidth may be included in the parameter set for the PDSCH RE mapping and the QCL. In this case, as described above in Table 3, the RRC connection re-establishment message includes the PDSCH-Config information element, and information on the TRS sub-frame and information on the TRS bandwidth can be included in the PDSCH-Config information element. If the TRS subframe information is determined based on the cell ID, the TRS subframe information can be represented through qcl-ScramblingIdentity information or v_shift information.

As another example, when the cell connected through the CoMP setting to the UE is an asynchronous NCT cell, the parameter for the TRS (and CRS) of the corresponding synchronous NCT cell and the parameter for the PSS / SSS Parameters for the presence can be included. That is, the parameter for the PDSCH RE mapping and the parameter for the QCL may include the parameters for the TRS (and CRS) option and the PSS / SSS option. In this case, as described in Table 4, the RRC connection re-establishment message includes a PDSCH-Config information element, and information on the TRS (and CRS) presence part and information on the PSS / . On the other hand, information for distinguishing between the synchronous NCT and the asynchronous NCT may be included in the PDSCH resource mapping parameters to indirectly direct the TRS (and CRS) neighbor and the PSS / SSS neighbor.

As another example, when the cell connected through the CoMP setting to the UE is the sleep mode supporting NCT cell, the DS setting information of the corresponding sleep mode supporting NCT cell may be included in the PDSCH resource mapping parameters indicated in the RRC connection re-establishment message. That is, the parameters for the DS setting information may be included in the parameter set for the PDSCH RE mapping and the QCL. In this case, as described above in Table 3, the RRC connection re-establishment message includes a PDSCH-Config information element, and the DS setting information can be included in the PDSCH-Config information element. Here, the DS setting information may include at least one of information indicating a corresponding cell ID, information indicating an offset of a subframe in which the DS is transmitted, and information indicating the number of antenna ports to which the DS is mapped.

The UE receives the RRC connection reestablishment message from the Node B, and performs RRC-related parameter reconfiguration at the UE based on the CoMP configuration information included in the RRC connection re-establishment message, and the information about the parameter set for the PDSCH RE mapping and the QCL (S1910). Here, the RRC-related parameter reset includes setting (resetting) the CoMP at the terminal end and setting (resetting) the parameter set for the PDSCH RE mapping and QCL.

If the parameter for the TRS subframe and the parameter for the TRS bandwidth are included in the PDSCH resource mapping parameters for the asynchronous NCT cell in the RRC connection re-establishment message, the parameter for the TRS subframe and the parameter for the TRS bandwidth are included And updates the PDSCH RE mapping and the parameter set for QCL at the terminal end.

If the parameters for the TRS (and CRS) option and the parameters for the PSS / SSS option are included in the PDSCH resource mapping parameters for the synchronous NCT cell in the RRC connection reestablishment message, the parameters for the TRS (and CRS) And updates the PDSCH RE mapping and the parameter set for the QCL including the parameters for the PSS / SSS containing section.

If the PDSCH resource mapping parameters for the sleep mode supported NCT cell include the parameter (s) for the DS setting information in the RRC connection re-establishment message, the PDSCH resource mapping parameters including the parameter (s) Update the parameter set for RE mapping and QCL.

The MS transmits an RRC connection reset message completion message to the BS (S1920). The RRC connection re-establishment complete message corresponds to the RRC connection re-establishment message transmitted from the base station to the mobile station in step S1900.

The base station transmits data to the terminal in the CoMP environment (S1930). In this case, the base station can provide a service to the terminal by configuring CoMP cooperation set with another base station (e.g., LPN). In this case, the UE receives and analyzes data and RSs in the CoMP environment based on the PDSCH RE mapping and QCL information. In this case, the UE receives and interprets the PDDCH from the base station (e.g., LPN) of the NCT cell in the CoMP environment, and performs PDSCH RE mapping of the DCI format 2D included in the PDDCH and PDSCH RE The PDSCH can be smoothly received and interpreted according to the parameter set for mapping and QCL.

20 shows an example of a CoMP support method considering NCT in a base station according to the present invention.

Referring to FIG. 20, the base station generates an RRC connection reset message related to the TM10 (i.e., CoMP) configuration including the NCT cell and transmits the RRC connection reset message to the mobile station (S2000). In this case, the BS transmitting the RRC connection re-establishment message to the MS may be a macro base station. Here, the RRC connection re-establishment message may include CoMP configuration information, and information on the PDSCH RE mapping and QCL peculiar to the NCT cell connected to the UE according to the CoMP configuration may be included. The PDSCH RE mapping and QCL information includes PDSCH RE mapping and parameter set for QCL including PDSCH resource mapping parameters peculiar to the NCT cell connected to the UE according to the CoMP setting.

For example, when the cell connected through the CoMP setting to the UE is an asynchronous NCT cell, the parameter for the TRS subframe and the parameter for the TRS bandwidth of the asynchronous NCT cell are allocated to the PDSCH resource mapping parameters indicated in the RRC connection re- . That is, the parameter for the TRS subframe and the parameter for the TRS bandwidth may be included in the parameter set for the PDSCH RE mapping and the QCL.

As another example, when the cell connected through the CoMP setting to the UE is an asynchronous NCT cell, the parameter for the TRS (and CRS) of the corresponding synchronous NCT cell and the parameter for the PSS / SSS Parameters for the presence can be included. That is, the parameter for the PDSCH RE mapping and the parameter for the QCL may include the parameters for the TRS (and CRS) option and the PSS / SSS option.

As another example, when the cell connected through the CoMP setting to the UE is the sleep mode supporting NCT cell, the DS setting information of the corresponding sleep mode supporting NCT cell may be included in the PDSCH resource mapping parameters indicated in the RRC connection re-establishment message. That is, the parameters for the DS setting information may be included in the parameter set for the PDSCH RE mapping and the QCL. Here, the DS setting information may include at least one of information indicating a corresponding cell ID, information indicating an offset of a subframe in which the DS is transmitted, and information indicating the number of antenna ports to which the DS is mapped.

The base station receives an RRC connection reset message completion message from the UE (S2010). The RRC connection re-establishment complete message corresponds to the RRC connection re-establishment message transmitted from the base station to the mobile station in S2000.

The base station transmits data to the terminal in the CoMP environment (S2020). In this case, the base station can provide a service to the terminal by configuring CoMP cooperation set with another base station (e.g., LPN). For example, the CoMP cooperative set has a category of CoMP that includes joint processing (JP) and collaborative scheduling / beamforming (CS / CB), and JP and CS / CB can be mixed. JP includes joint transmission (JT) and dynamic transmission / reception point selection (DPS).

FIG. 21 shows an example of a CoMP support method considering an NCT in a terminal according to the present invention.

The UE receives an RRC connection re-establishment message regarding the TM10 (i.e. CoMP) configuration including the NCT cell from the base station (S2100). In this case, the RRC connection re-establishment message may include CoMP configuration information, and information on the PDSCH RE mapping and QCL peculiar to the NCT cell (additionally) connected to the UE according to the CoMP configuration may be included. The PDSCH RE mapping and QCL information includes PDSCH RE mapping and parameter set for QCL including PDSCH resource mapping parameters peculiar to the NCT cell connected to the UE according to the CoMP setting.

For example, when the cell connected through the CoMP setting to the UE is an asynchronous NCT cell, the RRC connection re-establishment message includes the PDSCH RE mapping including the parameter for the TRS sub-frame of the asynchronous NCT cell and the parameter for the TRS bandwidth And a set of parameters for QCL.

As another example, when the cell connected through the CoMP setting to the UE is a synchronous NCT cell, the RRC connection re-establishment message includes the parameters for the TRS (and CRS) and the parameters for the PSS / SSS in the corresponding synchronous NCT cell The PDSCH RE mapping and the parameter set for the QCL.

As another example, when the cell connected through the CoMP setting to the UE is a sleep mode supporting NCT cell, the RRC connection re-establishment message includes the PDSCH RE mapping and the QCL including the parameters for DS setting information of the corresponding sleep mode supporting NCT cell A set of parameters may be included. Here, the DS setting information may include at least one of information indicating a corresponding cell ID, information indicating an offset of a subframe in which the DS is transmitted, and information indicating the number of antenna ports to which the DS is mapped.

In step S2110, the UE performs RRC-related parameter reconfiguration at the UE based on the CoMP configuration information included in the RRC connection re-establishment message, the PDSCH RE mapping, and the parameter set information for the QCL. Here, the RRC-related parameter reset includes setting (resetting) the CoMP at the terminal end and setting (resetting) the parameter set for the PDSCH RE mapping and QCL.

The MS transmits an RRC connection reset message completion message to the BS (S2120). The RRC connection re-establishment completion message corresponds to the RRC connection re-establishment message received from the base station in step S2100.

The UE receives and analyzes data and RSs in the CoMP environment based on the CoMP setting information and the QLC information (S2130). In this case, the UE receives and analyzes data and RSs in the CoMP environment based on the PDSCH RE mapping and QCL information. In this case, the UE receives and interprets the PDDCH from the base station (e.g., LPN) of the NCT cell in the CoMP environment, and performs PDSCH RE mapping of the DCI format 2D included in the PDDCH and PDSCH RE The PDSCH can be smoothly received and interpreted according to the parameter set for mapping and QCL.

22 is a block diagram schematically showing a base station and a terminal supporting CoMP in consideration of the NCT according to the present invention.

22, the base station 2200 according to the present invention can provide a CoMP service to the UE 2250 by configuring a CoMP cooperation set with another base station (e.g., LPN). The base station 2200 includes a base station transmitter 2205, a base station receiver 2220, and a base station processor 2210. The base station processor 2210 performs necessary functions and controls to implement the features of the present invention as described above. The base station processor 2210 includes a message processing unit 2211 and a CoMP control unit 2212.

The CoMP control unit 2212 determines whether to perform the CoMP operation with respect to the terminal 2250 in which the RRC connection is established. The CoMP control unit 2212 can determine whether to perform the CoMP operation on the terminal 2250 based on the network configuration and the location of the terminal 2250. [ The CoMP control unit 2212 can determine a CoMP category to be performed by the CoMP cooperation set. For example, the scope of CoMP is joint processing (JP) and collaborative scheduling / beamforming (CS / CB), and JP and CS / CB can be mixed. JP includes joint transmission (JT) and dynamic transmission point selection (DPS).

The message processing unit 2211 generates an RRC connection re-establishment message including TM10 (i.e., CoMP) setting information when the CoMP operation for the UE 2250 is determined to be performed. In this case, the message processor 2211 may generate the RRC connection re-establishment message further including information on the PDSCH RE mapping and the QCL peculiar to the NCT cell connected to the UE 2250 according to the CoMP setting. The information on the PDSCH RE mapping and the QCL includes a parameter set for the PDSCH RE mapping and the QCL including the PDSCH resource mapping parameters peculiar to the NCT cell connected to the UE according to the CoMP setting. In this case, the message processing unit 2211 may generate an RRC connection reset message including the message statements of Tables 3 to 5 above.

For example, when the cell connected through the CoMP setting to the UE 2250 is an asynchronous NCT cell, the message processor 2211 may include the PDSCH resource mapping parameters for the asynchronous NCT cell in the RRC connection reestablishment message. Specifically, the message processing unit 2211 may include at least one parameter of a parameter for a TRS subframe and a parameter for a TRS bandwidth in a parameter set for a PDSCH RE mapping and a QCL. In this case, as described above in Table 3, the RRC connection re-establishment message includes a PDSCH-Config information element, and the PDSCH-RE-Mapping QCL-Config field of the PDSCH- And at least one parameter of the TRS bandwidth.

As another example, when the cell connected through the CoMP setting to the UE 2250 is a synchronous NCT cell, the message processing unit 2211 may include the PDSCH resource mapping parameters for the corresponding synchronous NCT cell in the RRC connection re-establishment message. Specifically, the message processing unit 2211 may include at least one of parameters for the PDSCH RE mapping and the QCL and the parameters for the TRS (and CRS) option and the PSS / SSS option. In this case, as described in Table 4, the RRC connection re-establishment message includes a PDSCH-Config information element, and the PDSCH-RE-MappingQCL-Config field of the PDSCH- And a parameter for the PSS / SSS zone. The PDSCH-RE-MappingQCL-Config field of the PDSCH-Config information element includes a parameter for distinguishing whether it is a synchronous NCT or an asynchronous NCT. The TRS (and CRS) neighboring part and the PSS / .

As another example, when the cell connected through the CoMP setting to the UE 2250 is a sleep mode supporting NCT cell, the message processing unit 2211 includes PDSCH resource mapping parameters for the corresponding sleep mode supporting NCT cell in the RRC connection re-establishment message can do. Specifically, the message processing unit 2211 may include parameters for the DS setting information in the parameter set for the PDSCH RE mapping and the QCL. In this case, the RRC connection reestablishment message includes a PDSCH-Config information element as described in Table 5, and the PDSCH-RE-MappingQCL-Config field of the PDSCH-Config information element includes a parameter for the DS setting information can do. Here, the DS setting information may include at least one of information indicating a corresponding cell ID, information indicating an offset of a subframe in which the DS is transmitted, and information indicating the number of antenna ports to which the DS is mapped.

The base station transmitting unit 2205 transmits an RRC connection re-establishment message to the terminal 2250. The RRC connection reestablishment message includes TM10 (i.e. CoMP) setting information. In addition, the RRC connection re-establishment message may further include information on the PDSCH RE mapping and the QCL according to the NCT cell connected according to the CoMP setting. The base station transmission unit 2205 may transmit data and RS to the terminal 2250 in cooperation with other transmission / reception points constituting the CoMP cooperation set in the CoMP environment.

The base station receiving unit 2220 receives an RRC connection reset completion message from the terminal 2250. The RRC connection reestablishment completion message corresponds to an RRC connection re-establishment message transmitted from the base station transmission unit 2205 to the UE 2250.

The terminal 2250 according to the present invention supports CoMP operation. The terminal 2250 includes a terminal receiver 2255, a terminal transmitter 2270, and a terminal processor 2260. The terminal processor 2260 performs necessary functions and controls to implement the features of the present invention as described above. The terminal processor 2260 includes a message processing unit 2261 and a CoMP control unit 2262.

The terminal reception unit 2255 receives the RRC connection re-establishment message from the base station 2200. The terminal receiving unit 2255 receives the RRC connection re-establishment message including the CoMP setting information. The UE receiving unit 2255 may receive the RRC connection re-establishment message including the information on the PDSCH RE mapping and the QCL according to the NCT.

The message processing unit 2261 analyzes or analyzes the information or the syntax of the message received from the terminal receiving unit 2255.

The message processor 2261 may interpret the received RRC connection re-establishment message, and may obtain the CoMP configuration information, the PDSCH RE mapping, and the QCL information included in the message. For example, the message processing unit 2261 may interpret the message statements of Tables 3 to 5 above.

For example, when the cell connected through the CoMP setting to the UE 2250 is an asynchronous NCT cell, the message processor 2261 interprets the RRC connection re-establishment message and obtains information on the PDSCH RE mapping and the QCL of the asynchronous NCT cell can do. In this case, the information on the PDSCH RE mapping and the QCL may include at least one of the TRS subframe parameter and the TRS bandwidth parameter.

As another example, when the cell connected through the CoMP setting to the UE 2250 is a synchronous NCT cell, the message processing unit 2261 interprets the RRC connection re-establishment message and obtains information on the PDSCH RE mapping and QCL of the corresponding synchronous NCT cell can do. In this case, the information on the PDSCH RE mapping and the QCL may include at least one of the parameters for the TRS (and CRS) and the parameters for the PSS / SSS.

As another example, if the cell connected through the CoMP setting to the UE 2250 is a sleep mode supporting NCT cell, the message processor 2261 interprets the RRC connection re-establishment message, maps the PDSCH RE of the corresponding sleep mode supporting NCT cell, Information about the QCL can be obtained. In this case, the information on the PDSCH RE mapping and the QCL may include a parameter for the DS setting information. Here, the DS setting information may include at least one of information indicating a corresponding cell ID, information indicating an offset of a subframe in which the DS is transmitted, and information indicating the number of antenna ports to which the DS is mapped.

In addition, the message processor 2261 may generate the RRC connection re-establishment completion message and transmit the RRC connection re-establishment completion message to the base station 2200 through the terminal transmission unit 2270.

The CoMP control unit 2262 resets the RRC-related parameters at the terminal 2250. CoMP control unit 2262 can perform RRC-related parameter reset at the UE based on the CoMP setting information included in the RRC connection re-establishment message, and information on the PDSCH RE mapping and QCL. Here, the RRC-related parameter re-establishment includes CoMP setting / re-setting and PDSCH RE mapping and setting / resetting of the parameter set for QCL at the UE 2250.

If the RRC connection re-establishment message includes information on the PDSCH RE mapping and the QCL of the asynchronous NCT cell, the CoMP control unit 2262 controls the CoMP control unit 2262 to transmit the PDSCH RE mapping information for at least one TRS subframe included in the information on the PDSCH RE mapping and QCL. Based on the parameters and parameters for the TRS bandwidth, the PDSCH RE mapping and the parameter set for the QCL of the terminal 2250 can be updated.

In addition, when the RRC connection re-establishment message includes information on the PDSCH RE mapping and the QCL of the synchronous NCT cell, the CoMP control unit 2262 controls at least one of the PDSCH RE mapping and the QCL information included in the synchronous NCT cell It is possible to update the parameter set for the PDSCH RE mapping and the QCL of the UE 2250 based on the parameters for the TRS (and CRS) and the PSS / SSS for the UE 2250.

If the RRC connection reset message includes information on the PDSCH RE mapping and QCL of the sleep mode supporting NCT cell, the CoMP control unit 2262 adds information on the PDSCH RE mapping and the QCL of the sleep mode supporting NCT cell And update the parameter set for the PDSCH RE mapping and QCL of the terminal 2250 based on the parameters for the included DS setting information.

In this case, the terminal reception unit 2255 can receive data in the CoMP environment. The UE receiver 2255 can receive and decode data in the CoMP environment based on the information on the PDSCH RE mapping and the QCL of the NCT cell constituting the CoMP cooperation set. The UE receiving unit 2255 receives and decodes the PDDCH (or EPDDCH) from the base station (e.g., LPN) of the NCT cell in the CoMP environment and the DCI mapped to the PDCCH (or E (enhanced) PDCCH) If it represents DCI format 1A or DCI format 2D, it can adaptively receive and decode PDSCH according to the PDSCH RE mapping and parameter set for QCL indicated by the QCL indicator field.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (20)

A base station supporting Coordination Multi-Point (CoMP)
A CoMP control unit for deciding to perform a CoMP operation for a terminal having an established RRC (Radio Resource Control) connection;
A message processing unit for generating an RRC connection reset message including CoMP setting information;
A transmitting unit for transmitting the generated RRC connection re-establishment message to the MS; And
And a receiving unit for receiving an RRC connection reestablishment completion message corresponding to the RRC connection re-establishment message from the terminal,
The RRC connection reestablishment message generated by the message processor may include a Physical Downlink Shared Channel (PDSCH) RE (Physical Downlink Shared Channel) specific to the NCT cell when the cell connected to the UE is a new carrier type Resource Element) mapping and a Quasi Co-Location (QCL). The method according to claim 1,
Wherein the information on the PDSCH RE mapping and the QCL includes a parameter set for a PDSCH RE mapping and a QCL including PDSCH resource mapping parameters peculiar to the NCT cell connected to the UE according to the CoMP setting. Base station. 3. The method of claim 2,
The message processing unit may transmit at least one parameter of a parameter for a TRS subframe and a parameter for a TRS bandwidth to a parameter for the PDSCH RE mapping and QCL if the NCT cell connected to the UE is an asynchronous NCT cell according to the CoMP setting, Wherein the base station is included in a set. 3. The method of claim 2,
The message processor may process at least one of a parameter for the TRS field part and a parameter for the PSS / SSS field part to the PDSCH RE mapping and the QCL if the NCT cell connected to the UE is a synchronous NCT cell according to the CoMP setting. Characterized in that it is included in a parameter set. 3. The method of claim 2,
Wherein when the NCT cell connected to the UE according to the CoMP setting is a dormant mode supported NCT cell, the parameter for DS (discovery signal) setting information is included in the parameter set for the PDSCH RE mapping and the QCL,
Wherein the DS setup information includes at least one of information indicating a corresponding cell ID, information indicating an offset of a subframe in which the DS is transmitted, and information indicating the number of antenna ports to which the DS is mapped. As a terminal supporting CoMP,
A receiving unit for receiving from the base station an RRC connection reset message including CoMP setting information and information on a PDSCH RE mapping and a QCL peculiar to an NCT cell connected according to the CoMP setting;
A message processor for analyzing the CoMP setting information included in the RRC connection reestablishment message, information about the PDSCH RE mapping and the QCL peculiar to the NCT cell, and generating an RRC connection reestablishment completion message;
A CoMP control unit for re-setting RRC-related parameters based on the CoMP setting information, the PDSCH RE mapping, and the information on the QCL; And
And a transmitter for transmitting the generated RRC connection re-establishment complete message to the base station. The method according to claim 6,
Wherein the CoMP control unit updates the parameters of the parameter set for the PDSCH RE mapping and the QCL based on the information on the PDSCH RE mapping and the QCL in resetting the RRC related parameters. 8. The method of claim 7,
The message processor analyzes the PDSCH-Config information element of the RRC connection re-establishment message to obtain information on the PDSCH RE mapping and the QCL,
If the NCT cell connected to the UE is an asynchronous NCT cell according to the CoMP setting, the CoMP control unit sets a parameter for at least one TRS subframe and a parameter for a TRS bandwidth included in the information on the PDSCH RE mapping and QCL And updates parameters of the parameter set for the PDSCH RE mapping and the QCL based on the PDSCH RE mapping and the QCL. 8. The method of claim 7,
The message processor analyzes the PDSCH-Config information element of the RRC connection re-establishment message to obtain information on the PDSCH RE mapping and the QCL,
If the NCT cell connected to the UE according to the CoMP setting is a synchronous NCT cell, the CoMP control unit may include a parameter for at least one TRS field included in the PDSCH RE mapping and QCL information and a parameter for the PSS / And updates parameters of the parameter set for the PDSCH RE mapping and QCL based on the parameter. 8. The method of claim 7,
The message processor analyzes the PDSCH-Config information element of the RRC connection re-establishment message to obtain information on the PDSCH RE mapping and the QCL,
If the NCT cell connected to the UE according to the CoMP setting is a sleep mode supporting NCT cell, the CoMP control unit performs PDSCH RE mapping and QCL based on the DS setting information included in the PDSCH RE mapping and QCL information And updates the parameters of the set of parameters for the terminal. As a CoMP support method performed in a base station,
Determining whether to perform a CoMP operation for a terminal for which an RRC connection is established;
Generating an RRC connection reset message including CoMP setting information;
Transmitting the generated RRC connection re-establishment message to the MS; And
Receiving an RRC connection re-establishment complete message corresponding to the RRC connection re-establishment message from the terminal,
Wherein the RRC connection re-establishment message further includes information on a PDSCH RE mapping and QCL peculiar to the NCT cell when the cell connected to the UE is an NCT cell according to the CoMP setting. 12. The method of claim 11,
Wherein the information on the PDSCH RE mapping and the QCL includes a parameter set for the PDSCH RE mapping and the QCL including the PDSCH resource mapping parameters peculiar to the NCT cell connected to the UE according to the CoMP setting. How to Apply. 13. The method of claim 12,
If the NCT cell connected to the UE according to the CoMP setting is an asynchronous NCT cell, the parameter set for the PDSCH RE mapping and the QCL includes at least one parameter of a parameter for a TRS subframe and a parameter for a TRS bandwidth Gt; CoMP < / RTI > support method. 13. The method of claim 12,
If the NCT cell connected to the UE is a synchronous NCT cell according to the CoMP setting, the parameter set for the PDSCH RE mapping and the QCL includes at least one of parameters for the TRS field part and parameters for the PSS / SSS field part Gt; CoMP < / RTI > support method. 13. The method of claim 12,
Wherein the parameter set for the PDSCH RE mapping and QCL includes a parameter for DS setting information when the NCT cell connected to the UE according to the CoMP setting is a sleep mode supporting NCT cell,
Wherein the DS setting information includes at least one of information indicating a corresponding cell ID, information indicating a subframe period and offset to which the DS is transmitted, and information indicating the number of antenna ports to which the DS is mapped. Way. As a CoMP support method performed in a terminal,
Receiving from the base station an RRC connection reestablishment message including CoMP setting information and information on a PDSCH RE mapping and a QCL peculiar to the NCT cell connected according to the CoMP setting;
Analyzing the CoMP setting information included in the RRC connection re-establishment message, information on the PDSCH RE mapping and QCL peculiar to the NCT cell, and generating an RRC connection re-establishment completion message;
Resetting the RRC-related parameters based on the CoMP setting information, the PDSCH RE mapping, and the information on the QCL; And
And transmitting the generated RRC connection re-establishment complete message to the base station. 17. The method of claim 16,
Wherein the step of resetting the RRC related parameters updates the parameters of the parameter set for the PDSCH RE mapping and the QCL based on the information on the PDSCH RE mapping and the QCL. 18. The method of claim 17,
The PDSCH RE mapping and QCL information are included in the PDSCH-Config information element of the RRC connection re-establishment message,
If the NCT cell connected to the UE according to the CoMP setting is an asynchronous NCT cell, updating of the parameters of the parameter set for the PDSCH RE mapping and the QCL is performed using at least one TRS included in the information on the PDSCH RE mapping and QCL A parameter for a subframe, and a parameter for a TRS bandwidth. 18. The method of claim 17,
The PDSCH RE mapping and QCL information are included in the PDSCH-Config information element of the RRC connection re-establishment message,
If the NCT cell connected to the UE is a synchronous NCT cell according to the CoMP setting, updating of parameters of the parameter set for the PDSCH RE mapping and the QCL is performed using at least one TRS included in the information on the PDSCH RE mapping and QCL A parameter for a subframe, and a parameter for a TRS bandwidth. 18. The method of claim 17,
The PDSCH RE mapping and QCL information are included in the PDSCH-Config information element of the RRC connection re-establishment message,
If the NCT cell connected to the UE according to the CoMP setting is a sleep mode supported NCT cell, updating of the parameters of the parameter set for the PDSCH RE mapping and the QCL is performed using the DS setting included in the information about the PDSCH RE mapping and the QCL Gt; CoMP < / RTI > support method.

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