KR20100118062A - Method for transmitting downlink reference signal and appratus for the same - Google Patents

Abstract

PURPOSE: A downlink reference signal transmission method and an apparatus thereof are provided to improve the channel estimation performance by exclusively transmitting the exclusive reference signal with various control channels. CONSTITUTION: The data for layer below eight is transmitted through the data area of down link subframe. The reference signal for the layer below eight is transmitted on the predetermined OFDM symbol of the downlink subframe. The reference signal corresponds to the exclusive reference signal for decoding the data for the layer below eight.

Description

TECHNICAL FOR TRANSMITTING DOWNLINK REFERENCE SIGNAL AND APPRATUS FOR THE SAME}

The following description relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting a downlink reference signal in a wireless communication system.

A multiple input multiple output (MIMO) system refers to a system that improves transmission and reception efficiency of data using multiple transmission antennas and multiple reception antennas. MIMO technology includes a spatial diversity technique and a spatial multiplexing technique. The spatial diversity scheme can increase transmission reliability or widen a cell radius through diversity gain, which is suitable for data transmission for a mobile terminal moving at high speed. Spatial multiplexing can increase the data rate without increasing the bandwidth of the system by simultaneously transmitting different data.

In the MIMO system, each transmit antenna has an independent data channel. Therefore, the receiver estimates a channel for each of the transmitting antennas and receives data transmitted from each transmitting antenna. Channel estimation refers to a process of restoring a received signal by compensating for distortion of a signal caused by fading. Here, fading refers to a phenomenon in which the strength of a signal is rapidly changed due to multipath-time delay in a wireless communication system environment. For channel estimation, a reference signal known to both the transmitter and the receiver is required. In addition, the reference signal may simply be referred to as a reference signal (RS) or a pilot according to the applied standard.

The downlink reference signal is a coherent such as a Physical Downlink Shared CHannel (PDSCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid Indicator CHannel (PHICH), and a Physical Downlink Control CHannel (PDCCH). Pilot signal for demodulation. The downlink reference signal includes a common reference signal (CRS) shared by all terminals in a cell and a dedicated reference signal (DRS) only for a specific terminal. The common reference signal may be called a cell-specific reference signal. The dedicated reference signal may also be called a UE-specific reference signal.

The dedicated reference signal is used to provide coherent demodulation of the terminal that performs beamforming. Channel estimation by the common reference signal is performed by interpolating and averaging reference signals in frequency domain and time domain other than the allocated bandwidth. The terminal measures the common reference signal and informs the base station of feedback information such as channel quality information (CQI), precoding matrix indicator (PMI), and rank indicator (RI). The base station may perform downlink frequency domain scheduling using the feedback information. Pseudo-random sequences may be used as the dedicated and common reference signals.

In arranging a dedicated reference signal and a common reference signal, there are various things to consider. The amount of radio resources to be allocated to the reference signal, the exclusive arrangement of the dedicated reference signal and the common reference signal, the location of the synchronization channel (hereinafter referred to as SCH) and broadcast channel (hereinafter referred to as BCH), the density of the dedicated reference signal, etc. This is it.

If a lot of resources are allocated to the reference signal, high channel estimation performance can be obtained because the density of the reference signal is high, while the data rate can be relatively low. If a small amount of resources are allocated to the reference signal, a high data rate can be obtained, but the density of the reference signal can be lowered, resulting in degradation of channel estimation performance.

In the case of beamforming transmission, since both the dedicated reference signal and the common reference signal are transmitted, there is a need for a method of arranging them so as not to overlap them. In addition, when a specific OFDM symbol is allocated for the transmission of the SCH and the BCH, the dedicated reference signal may not be transmitted. If the dedicated RS is not transmitted exclusively with the common RS or overlaps with the SCH or BCH, the UE may not be able to recover data.

Accordingly, there is a need for a method capable of efficiently transmitting a dedicated reference signal.

The present invention is to provide a method of transmitting a dedicated reference signal to reduce the loss caused during data recovery by efficiently placing the dedicated reference signal in a subframe.

In order to solve the above technical problem, a method for transmitting a reference signal to a user equipment by a base station using 8 or less layers according to an embodiment of the present invention is provided in the 8 or less layer through a data region of a downlink subframe. And transmitting a reference signal for the layer of 8 or less on a predetermined OFDM symbol of the downlink subframe, wherein the reference signal demodulates data for the layer of 8 or less. Dedicated Reference Signal (DRS), and the reference signal for the 8 or less layers are two resource blocks (RBs) contiguous in time of the downlink subframe, that is, one TTI (or first and second subframes). Slot) on a resource element of 24 or less in an RB Pair, which may be a unit of resource mapping, and refers to the layer of 8 or less Some of the call may be multiplexed by CDM (Code Division Multiplexing) method on a resource element.

In addition, reference signals for 2, 3, 4, or 6 layers among the reference signals for the 8 or less layers may be multiplexed by the CDM scheme on the one resource element.

In addition, each of the reference signals for the 8 or less layers may be disposed on 4 or more resource elements in two consecutive resource blocks (resource block pairs) in time of the downlink subframe.

In addition, reference signals for the first and second layers are disposed on 12 resource elements in two consecutive resource blocks (resource block pairs) in time of the downlink subframe, and reference signals for the third and fourth layers. Is disposed on eight resource elements in two consecutive resource blocks (resource block pairs) of the downlink subframe, and reference signals for the fifth to eighth layers are two consecutive resources in time of the downlink subframe. It can be placed on 4 resource elements within a block (resource block pair).

In order to solve the above technical problem, a method of processing a reference signal received from a base station by a terminal using 8 or less layers according to another embodiment of the present invention, the 8 or less through the data area of the downlink subframe Receiving data for a layer, receiving a reference signal for the layer 8 or less on a predetermined OFDM symbol of the downlink subframe, and using the received reference signal for the layer 8 or less Estimating a channel to demodulate data, wherein reference signals for the 8 or less layers are located on 24 or less resource elements within two consecutive resource blocks (resource block pairs) in time of the downlink subframe. Some of the reference signals for the 8 or less layers are arranged on one resource element. can be multiplexed by exing).

Reference signals for 2, 3, 4, or 6 layers among the reference signals for the 8 or less layers may be multiplexed by the CDM method on the one resource element.

In addition, each of the reference signals for the 8 or less layers may be disposed on 4 or more resource elements in two consecutive resource blocks (resource block pairs) in time of the downlink subframe.

In addition, reference signals for the first and second layers are disposed on 12 resource elements in two consecutive resource blocks (resource block pairs) in time of the downlink subframe, and reference signals for the third and fourth layers. Is disposed on eight resource elements in two consecutive resource blocks (resource block pairs) of the downlink subframe, and reference signals for the fifth to eighth layers are two consecutive resources in time of the downlink subframe. It can be placed on 4 resource elements within a block (resource block pair).

In order to solve the above technical problem, a base station for transmitting a reference signal to a terminal using 8 or less layers according to another embodiment of the present invention, a receiving module for receiving an uplink signal from the terminal, the downlink to the terminal A transmission module for transmitting a link signal, and a processor connected to the reception module and the transmission module and controlling the base station including the reception module and the transmission module, wherein the processor is downward through the transmission module. And transmits data for the layer 8 or less through a data region of a link subframe, and transmits a reference signal for the layer 8 or less on a predetermined OFDM symbol of the downlink subframe. A dedicated reference signal (DRS) for demodulating data for the 8 or less layers, Reference signals for the following layers are disposed on 24 or less resource elements in two consecutive resource blocks (resource block pairs) in time in the downlink subframe, and some of the reference signals for the 8 or less layers are one. It can be multiplexed by a code division multiplexing (CDM) scheme on resource elements of.

In order to solve the above technical problem, a terminal for processing a reference signal received from a base station using 8 or less layers according to another embodiment of the present invention, a receiving module for receiving control information and data from the base station, the A transmission module for transmitting control information and data to a base station, and a processor connected to the reception module and the transmission module and controlling the terminal including the reception module and the transmission module. A module to receive data for the layer 8 or less through a data region of a downlink subframe, and to receive a reference signal for the layer 8 or less on a predetermined OFDM symbol of the downlink subframe; The terminal uses the received reference signal to the 8 or less layer It estimates the channel to demodulate the data for, and the reference signal for the 8 or less layer is on 24 or less resource elements in two consecutive resource blocks (resource block pairs) in time of the downlink subframe. Some of the reference signals for the 8 or less layers may be multiplexed by a code division multiplexing (CDM) scheme on one resource element.

According to the present invention, in a wireless communication system, a dedicated reference signal can be transmitted exclusively with various control channels, thereby improving channel estimation performance. In addition, by efficiently disposing within the subframe of the dedicated reference signal it is possible to reduce the loss caused during data recovery.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

1 is a block diagram showing the structure of a transmitter having multiple antennas.
2 illustrates a structure of a downlink radio frame.
3 is an exemplary diagram illustrating an example of a resource grid for one downlink slot.
4 is a diagram illustrating a subframe structure according to a general CP configuration.
5 to 54 illustrate embodiments of a pattern of a dedicated reference signal according to the present invention.
55 is a diagram showing the configuration of a preferred embodiment of a wireless communication system including a terminal apparatus and a base station apparatus according to the present invention.

The following embodiments are a combination of elements and features of the present invention in a predetermined form. Each component or feature may be considered to be optional unless otherwise stated. Each component or feature may be implemented in a form that is not combined with other components or features. In addition, some of the elements and / or features may be combined to form an embodiment of the present invention. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments.

In the present specification, embodiments of the present invention will be described based on a relationship between data transmission and reception between a base station and a terminal. Here, the base station has a meaning as a terminal node of the network that directly communicates with the terminal. The specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases.

That is, it is obvious that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station. A 'base station (BS)' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point (AP), and the like. The repeater may be replaced by terms such as relay node (RN) and relay station (RS). In addition, the term “terminal” may be replaced with terms such as a user equipment (UE), a mobile station (MS), a mobile subscriber station (MSS), a subscriber station (SS), and the like.

Specific terms used in the following description are provided to help the understanding of the present invention, and the use of such specific terms may be changed to other forms without departing from the technical spirit of the present invention.

In some instances, well-known structures and devices may be omitted or shown in block diagram form centering on the core functions of the structures and devices in order to avoid obscuring the concepts of the present invention. In addition, the same components will be described with the same reference numerals throughout the present specification.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802 system, 3GPP system, 3GPP LTE and LTE-Advanced (LTE-A) system and 3GPP2 system. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.

The following techniques include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and the like. It can be used in various radio access systems. CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is part of an Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink. LTE-A (Advanced) is the evolution of 3GPP LTE. WiMAX can be described by the IEEE 802.16e standard (WirelessMAN-OFDMA Reference System) and the advanced IEEE 802.16m standard (WirelessMAN-OFDMA Advanced system). For clarity, the following description focuses on the 3GPP LTE standard, but the technical spirit of the present invention is not limited thereto.

1 is a block diagram showing the structure of a transmitter having multiple antennas.

Referring to FIG. 1, the transmitter 100 includes an encoder (110-1, ..., 110-K), a modulation mapper (120-1, ..., 120-K) (or a modulator, Modulator, layer mapper 130, precoder 140, resource element mapper 150-1, ..., 150-K (or subcarrier mapper) and OFDM Signal generators 160-1, ..., 160-K. The transmitter 100 includes Nt transmit antennas 170-1,..., 170 -Nt.

The encoders 110-1, ..., 110-K encode the input data according to a predetermined coding scheme to form coded data. The modulation mapper 120-1, ..., 120-K maps the coded data to modulation symbols representing positions on the signal constellation. The modulation scheme is not limited and may be m-Phase Shift Keying (m-PSK) or m-Quadrature Amplitude Modulation (m-QAM). For example, m-PSK may be BPSK, QPSK or 8-PSK. m-QAM may be 16-QAM, 64-QAM or 256-QAM.

The layer mapper 130 defines a layer of modulation symbols so that the precoder 140 can distribute antenna-specific symbols to the paths of the respective antennas. The layer is defined as an information path input to the precoder 140. The information path before the precoder 140 may be referred to as a virtual antenna or a layer.

The precoder 140 outputs an antenna specific symbol by processing the modulation symbol by a MIMO scheme according to the multiple transmit antennas 170-1,..., 170 -Nt. The precoder 140 distributes the antenna specific symbol to the resource element mappers 150-1,..., 150 -K of the path of the corresponding antenna. Each information path sent by the precoder 140 to one antenna is called a stream. This may be referred to as a physical antenna.

The resource element mapper 150-1,..., 150 -K allocates an antenna specific symbol to an appropriate resource element and multiplexes according to a user. The OFDM signal generators 160-1,..., 160 -K output an OFDM symbol by modulating the antenna specific symbol by the OFDM scheme. The OFDM signal generators 160-1, ..., 160-K may perform an inverse fast fourier transform (IFFT) on an antenna specific symbol, and a cyclic prefix (CP) is inserted into the time domain symbol on which the IFFT is performed. Can be. The CP is a signal inserted in a guard interval to remove inter-symbol interference due to multiple paths in the OFDM transmission scheme. The OFDM symbol is transmitted through each transmit antenna 170-1,..., 170 -Nt.

2 shows a structure of a downlink radio frame.

Referring to FIG. 2, a downlink radio frame consists of 10 subframes, and one subframe consists of two slots. The downlink radio frame may be configured by frequency division duplex (FDD) or time division duplex (TDD). The time it takes for one subframe to be transmitted is called a transmission time interval (TTI). For example, one subframe may have a length of 1 ms and one slot may have a length of 0.5 ms. One slot includes a plurality of OFDM symbols in the time domain and includes a plurality of resource blocks (RBs) in the frequency domain.

The number of OFDM symbols included in one slot may vary depending on the configuration of the CP. CP has an extended CP (normal CP) and a normal CP (normal CP). For example, when an OFDM symbol is configured by a general CP, the number of OFDM symbols included in one slot may be seven. When the OFDM symbol is configured by an extended CP, since the length of one OFDM symbol is increased, the number of OFDM symbols included in one slot is smaller than that of the normal CP. In the case of an extended CP, for example, the number of OFDM symbols included in one slot may be six. If the channel state is unstable, such as when the terminal moves at a high speed, an extended CP may be used to further reduce intersymbol interference.

When a general CP is used, since one slot includes 7 OFDM symbols, one subframe includes 14 OFDM symbols. In this case, the first two or three OFDM symbols of each subframe may be allocated to a physical downlink control channel (PDCCH), and the remaining OFDM symbols may be allocated to a physical downlink shared channel (PDSCH).

The structure of the radio frame is only an example, and the number of subframes included in the radio frame or the number of slots included in the subframe and the number of symbols included in the slot may be variously changed.

3 is an exemplary diagram illustrating an example of a resource grid for one downlink slot. This is the case in which an OFDM symbol consists of a normal CP. Referring to FIG. 3, the downlink slot includes a plurality of OFDM symbols in the time domain and includes a plurality of resource blocks (RBs) in the frequency domain. Here, one downlink slot includes 7 OFDM symbols and one resource block includes 12 subcarriers, but is not limited thereto. Each element on the resource grid is called a resource element (RE). For example, the resource element a (k, l) becomes a resource element located in the k-th subcarrier and the l-th OFDM symbol. One resource block includes 12 × 7 resource elements. Since the interval of each subcarrier is 15 kHz, one resource block includes about 180 kHz in the frequency domain. N ^DL is the number of resource blocks included in the downlink slot. The value of N ^DL may be determined according to a downlink transmission bandwidth set by scheduling of the base station.

4 is a diagram illustrating a resource element to which a reference signal, a synchronization signal, and a broadcast channel are mapped when a general CP is used. In FIG. 4, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. 4 corresponds to two slots constituting one subframe in the time domain, and corresponds to subcarriers constituting a resource block of one slot in the frequency domain. For example, two resource blocks (resource block pairs) contiguous in time of one subframe of FIG. 4 may consist of 14 OFDM symbols in a time domain and 12 subcarriers in a frequency domain. The smallest rectangular area in the time-frequency domain shown in FIG. 4 is an area corresponding to one OFDM symbol in the time domain and one subcarrier in the frequency domain.

Referring to FIG. 4 (a), Rp denotes a resource element used for transmitting a reference signal on a pth antenna port. For example, R0 to R3 represent resource elements to which common reference signals transmitted from the 0 to third antenna ports are mapped, and R5 represents resource elements to which dedicated reference signals transmitted to the fifth antenna port are mapped. The common reference signals transmitted by the zeroth and first antenna ports are transmitted at six subcarrier intervals (based on one antenna port) on the zeroth, fourth, seventh, and eleventh OFDM symbols. The common reference signals transmitted by the second and third antenna ports are transmitted at six subcarrier intervals (based on one antenna port) on the first and eighth OFDM symbols. The dedicated reference signal is transmitted in four subcarrier intervals on the third, sixth, ninth and twelfth OFDM symbols of every subframe. Accordingly, 12 dedicated reference signals are transmitted in two consecutive resource blocks (resource block pairs) in time of one subframe.

4 (b) and 4 (c) show the same positions of the common reference signals R0 to R3 shown in FIG. 4 (a), and time-frequency of the dedicated reference signal R5 transmitted from the fifth antenna port. Another embodiment of location on a region is shown.

In addition, although not shown in FIG. 4, R4 may indicate a resource element used for transmitting a reference signal of a multicast broadcast single frequency network (MBSFN) in a fourth antenna port. The positions of each of R0 to R5 are arranged not to overlap.

On the other hand, the synchronization signal is a physical layer signal used for cell-search (cell-search), there is a primary synchronization signal (primary synchronization signal) and the secondary synchronization signal (secondary synchronization signal). The physical channel through which the primary synchronization signal is transmitted is called a primary-synchronization channel (P-SCH), and the physical channel through which the secondary synchronization signal is transmitted is called a secondary-synchronization channel (S-SCH).

The main synchronization signal is a signal used for the terminal to synchronize slot synchronization during initial cell search and may be generated by a ZADoff-Chu sequence in the frequency domain. If the downlink radio frame is a structure supporting FDD, the main synchronization signal is the last OFDM symbol of the 0th and 10th slots of every radio frame (i.e., the 6th subframe at 5 subframe periods) as shown in FIG. May be mapped to an OFDM symbol). If the downlink radio frame has a structure supporting TDD, the main synchronization signal may be mapped to third OFDM symbols of the first and sixth subframes (not shown).

The auxiliary synchronization signal is a signal used for frame synchronization after the terminal synchronizes slot synchronization, and may be defined as a combination of two 31-bit sequences. As shown in FIG. 4 of each radio frame, the auxiliary synchronization signal may be mapped to fifth OFDM symbols of the 0th and 10th slots of the radio frame (that is, the fifth OFDM symbol of the subframe in 5 subframe periods).

The physical broadcast channel (P-BCH) is a channel for transmitting system information of a cell. As illustrated in FIG. 4, the P-BCH may be mapped to seventh through ninth OFDM symbols in one subframe and transmitted in a period of 10 subframes. However, it is mapped only to subcarriers at positions other than R0 to R3 which are resource elements allocated as the common reference signal.

Here, the resource element to which the SCH and the P-BCH are mapped may overlap with the resource element to which data is transmitted or the resource element to which a dedicated RS is transmitted. For example, when the downlink radio frame has a structure supporting FDD, the fifth to ninth OFDM symbols are occupied by SCHs or P-BCHs, and are dedicated reference signals mapped to R5 on the sixth and ninth OFDM symbols. Overlap Therefore, the dedicated reference signal is punctured and not transmitted in the OFDM symbol of this period. Similar problems may occur when the downlink radio frame has a structure supporting TDD. Therefore, when the dedicated reference signal is disposed, the positions of the SCH and the P-BCH should be taken into consideration, and the dedicated reference signal may be positioned in at least one symbol period in symbols other than the OFDM symbols in which the SCH and the P-BCH are transmitted. In addition, considerations in the arrangement of dedicated reference signals include PDSCH decoding, transmission density of dedicated reference signals, robustness in a high-speed mobile environment, frequency selective channel, support for distributed mode, and PDCCH. Number of OFDM symbols; In addition, since FIG. 4 is a case of a general CP, how to arrange a dedicated reference signal in case of an extended CP.

The aforementioned cell-specific reference signal is used for estimating a channel of a physical antenna terminal and is a reference signal commonly transmitted to all UEs in a cell. The channel information estimated by the UE through the cell-specific reference signal includes single antenna transmission, transmit diversity, closed-loop spatial multiplexing, and open-loop spatial multiplexing. (Open-loop Spatial multiplexing), it can be used for demodulation of data transmitted by a transmission scheme such as multi-user MIMO (MU-MIMO), and the terminal measures the channel and reports to the base station Can be used as In order to improve channel estimation performance through the cell-specific reference signal, the cell-specific reference signal may be shifted by shifting the position in the subframe of the cell-specific reference signal. For example, when the reference signal is located every three subcarriers, one cell may be arranged at a subcarrier spacing of 3k and another cell at a subcarrier spacing of 3k + 1.

The dedicated reference signal is a terminal-specific reference signal used for data demodulation. When a multi-antenna transmission is performed, a precoding weight used for a specific terminal is also used for the reference signal. Equivalent channel combined with the transmitted precoding weight and the transmission channel can be estimated. Since the dedicated reference signal requires orthogonality between the transport layers, the pattern of the reference signal may be defined differently according to the transmission rank.

Existing 3GPP LTE systems support transmission of up to 4 transmit antennas, and cell-specific reference signals for supporting a single transmit antenna, 2 transmit antennas, and 4 transmit antennas are defined, and dedicated reference signals for rank 1 beamforming are defined. Meanwhile, in the LTE-A (Advanced) system, which is the evolution of 3GPP LTE, high order MIMO, multi-cell transmission, and advanced multi-user-MIMO are considered, which supports efficient reference signal operation and advanced transmission scheme. In order to solve this problem, data demodulation based on a dedicated reference signal is considered. In the LTE-A system, an 8 transmit antenna RS structure is provided to support an 8 transmit antenna MIMO scheme, and a measurement reference signal and a dedicated reference signal may be separated and transmitted to reduce RS overhead. In the case of the dedicated reference signal, the reference signal structure may be optimized by further reducing the reference signal overhead by using the precoded reference signal and transmitting the measurement reference signal in a low duty cycle. In addition, the dedicated reference signal is preferably set to exist only in the resource block and layer scheduled downlink transmission by the base station.

In order to satisfy the above requirements, the newly defined dedicated reference signal can support rank 8 and support dual stream beamforming, cooperative multi-point transmission, and advanced multi-user-MIMO together. To this end, the following may be considered.

Transmitting a reference signal with a high density to improve channel estimation performance may satisfy a target performance of a user who requires high channel estimation performance, but in some users, a wasteful pilot may occur. On the contrary, when a low density reference signal is transmitted to increase system yield, a user may have a high data rate but an increased bit error. For example, a user with a fast moving speed experiences a rapidly changing channel, and since the correlation time is short, a narrow reference signal structure is suitable to obtain a desired channel estimation performance. However, some users may be stationary, and in this case, since the correlation time is long, excellent channel estimation performance can be obtained even with wide reference signal intervals. Therefore, in consideration of the reference signal density and the channel estimation performance, a method of transmitting a reference signal having a proper reference signal density and a pattern on the time domain and the frequency domain should be considered.

In the LTE-A system, a cell-specific reference signal needs to be always transmitted so that an existing LTE system can operate. The cell-specific reference signal may be a reference signal for a single transmit antenna, 2 transmit antennas, and 4 transmit antennas. In designing a dedicated reference signal, a frequency shift of a cell-specific reference signal may be considered. The dedicated reference signal may be located on the same OFDM symbol as the cell-specific reference signal or may be located on an OFDM symbol that does not include the cell-specific reference signal.

In the LTE-A system, it is required to support two types of reference signals: a reference signal for PDSCH demodulation and a reference signal for channel state information (CSI) measurement. The above-mentioned dedicated reference signal (DRS) may also be referred to as a demodulation reference signal (DM RS) and is distinguished from a reference signal for CSI measurement. One or two reference signals for the CSI measurement may exist in one subframe, and the reference signal and the dedicated reference signal for the CSI measurement may be designed not to be located together on one OFDM symbol.

In consideration of the puncturing of data and dedicated reference signals to resource elements to which SCHs and BCHs are mapped, a dedicated reference signal may be included in at least one OFDM symbol except for OFDM symbols to which SCHs and BCHs are mapped. In addition, in the backhaul link between the repeater and the base station, a transition of subframe timing may be required for timing alignment and the like, and for this purpose, the last OFDM symbol of the subframe may be punctured.

In dual stream beamforming, a dedicated reference signal for rank 2 beamforming may be designed to reuse a dedicated reference signal pattern for rank 1 beamforming. In this case, the two layers can be multiplexed using code division multiplexing (CDM), time division multiplexing (TDM) or frequency division multiplexing (FDM). In addition, when transmitting a reference signal of rank 2 or more using two or more layers, reference signals through each layer may be multiplexed using a CDM in a specific time-frequency domain, or additionally, TDM or FDM between time-frequency domains. It is also possible to transmit a dedicated reference signal by multiplexing using.

In addition, demodulation may be performed on a frequency domain and a time domain to which the dedicated reference signal is not allocated by interpolating or extrapolating the dedicated reference signal. Channel estimation by extrapolation may have lower channel estimation performance than the case of interpolation. Therefore, it may be considered to reduce the extrapolated channel estimation by putting a dedicated reference signal at the end of the time-frequency domain of two consecutive resource blocks (resource block pairs) in time of one subframe.

Thus, in the case of a general CP configuration in which one subframe includes 14 OFDM symbols (0 th to 13 th OFDM symbols), the PDCCH region is located in the 0 th to 2 nd OFDM symbols, and the cell-specific reference signal is generated by the first CP. Located in 0, 1, 4, 7, 8, and 11 OFDM symbols, SCH is located in the fifth and sixth OFDM symbol, BCH may be located in the seventh, eighth and ninth OFDM symbol. . In addition, the thirteenth OFDM symbol may be punctured according to the subframe timing shift. Therefore, the dedicated reference signal needs to be designed to be located in at least one of the third, tenth and twelfth OFDM symbols.

In consideration of the above, it is necessary to design a pattern of the dedicated reference signal so that demodulation of data by channel estimation using the dedicated reference signal is efficiently performed.

In the following embodiments, a general CP configuration that configures one subframe using 14 OFDM symbols will be mainly described. However, when one subframe is configured with fewer than 14 OFDM symbols as in the case of an extended CP configuration in which one subframe includes 12 OFDM symbols, a dedicated reference signal is described in the following embodiments. The OFDM symbol including the cell-specific reference signal and the reference signal for CSI measurement is included in a subframe, and in the following embodiments, the OFDM symbol including only data without reference signal is allocated is excluded from the subframe. One subframe may be configured.

The present invention proposes a dedicated reference signal pattern for each layer (antenna port) up to rank 8 as described through the following embodiments.

Regarding the dedicated reference signal pattern according to FDM or TDM in the case of rank 2 transmission, the position indicated by 'A' in the time-frequency domain in the figure and related description showing the resource element RE to which the present invention is applied is The position of the dedicated reference signal with respect to one layer (antenna port) is shown, and the position marked with 'B' indicates the position of the dedicated reference signal with respect to the second layer (antenna port). In the case of rank 2 transmission, a dedicated reference signal for two layers multiplexed using the CDM may be multiplexed using various codes. For example, Hadamard, Discrete Fourier Transform (DFT), Walsh, Constant Amplitude Zero Autocorrelation Waveform (CAZAC), Pseudo Noise (PN) sequence, and the like may be used. In the drawings and related description, the position indicated as 'A / B' on one resource element indicates the position of the dedicated reference signal for the first and second layers multiplexed using the CDM.

In the case of rank 4 transmission, in addition to the above-described display method in rank 2 transmission, the position indicated by 'C' indicates a dedicated reference signal for the third layer, and the position indicated by 'D' is dedicated to the fourth layer. Indicates a reference signal. In the case of rank 8 transmission, in addition to the display method of rank 4 transmission, the position indicated by 'E' indicates a dedicated reference signal for the fifth layer, and the position indicated by 'F' indicates a dedicated reference signal for the sixth layer. The position indicated by 'G' indicates a dedicated reference signal for the seventh layer, and the position indicated by 'H' indicates a dedicated reference signal for the eighth layer.

In the drawing, the position indicated by 'C / D' means that the dedicated reference signals for the third and fourth layers are multiplexed in the CDM scheme and disposed in the corresponding resource element, and the position indicated by 'E / F' is represented by the fifth position. And a dedicated reference signal for the sixth layer is multiplexed in the CDM scheme and disposed in the corresponding resource element. A position indicated by 'G / H' is a multiplexed dedicated reference signal for the seventh and eighth layers in the CDM scheme. This means that it is placed in the resource element.

In addition, the position marked 'C / E / G' means that the dedicated reference signals for the third, fifth and seventh layers are multiplexed in the CDM scheme and arranged in the corresponding resource element, and the 'D / F / H' The position indicated by denotes that the dedicated reference signals for the fourth, sixth, and eighth layers are multiplexed by the CDM scheme and arranged in the corresponding resource element.

In addition, the position indicated as 'C ~ E' or 'C-E' means that the dedicated reference signals for the third to fifth layers are multiplexed in the CDM scheme and arranged in the corresponding resource element. The position marked 'F-H' means that the dedicated reference signals for the sixth to eighth layers are multiplexed by the CDM scheme and arranged in the corresponding resource element. In addition, the position indicated as 'C ~ H' or 'C-H' means that the dedicated reference signals for the third to eighth layers are multiplexed by the CDM scheme and arranged in the corresponding resource element.

The position of the layer and the reference signal in the time-frequency domain is not limited to the above-described mapping relationship, and an arbitrary layer may be mapped to any reference signal position while maintaining the mapping relationship at 1: 1.

In addition, when transmitting a reference signal of rank 2 or more using two or more layers, reference signals through each layer may be multiplexed using a CDM in a specific time-frequency domain, or additionally, TDM or FDM between time-frequency domains. It is also possible to transmit a dedicated reference signal by multiplexing using.

Meanwhile, in the case of rank 1 transmission, all positions in which a dedicated reference signal for rank 2 transmission is displayed may be used as positions of reference signals for one layer (antenna port).

In the following embodiments, a dedicated reference signal pattern may be configured in consideration of the following matters.

In order to reduce the occurrence of symbol power fluctuation during power boosting of the dedicated reference signal, the dedicated reference signal for each antenna port may be equally allocated in one subframe. Meanwhile, in order to further improve channel estimation performance for one layer, more dedicated reference signals for one layer may be allocated in one subframe than other layers.

In order to make the channel estimation performance through the dedicated reference signal robust to the time-selective characteristic, the symbol interval may be narrowly arranged in a manner that encompasses the time domain of one subframe. Alternatively, the subcarrier spacing may be narrowly arranged in such a manner as to cover the frequency domain of one subframe such that channel estimation performance through the dedicated reference signal is robust to the frequency selective characteristic.

In consideration of low mobility, the positions of the dedicated reference signals may be densely arranged in a specific time domain. On the other hand, in consideration of high mobility, the position of the dedicated reference signal may be widely arranged in a manner that encompasses the time domain of one subframe.

In designing a dedicated reference signal pattern, in consideration of the frequency shift of the cell-specific reference signal, a margin for the dedicated reference signal is not disposed on a subcarrier may be provided to increase scalability with respect to the frequency shift. Alternatively, the dedicated reference signal may be positioned in the first and last subcarriers as much as possible to prevent degradation of channel estimation performance caused by extrapolating the dedicated reference signal to estimate the channel.

In the following embodiments, the dedicated reference signal may be configured not to be disposed in the 0 to 2 OFDM symbols to which the PDCCH region is allocated. In addition, the dedicated reference signal may be set not to be disposed in the zeroth, fourth, seventh, and eleventh OFDM symbols in which the common reference signals transmitted from the zeroth and first antenna ports are transmitted. A dedicated reference signal may be disposed in an OFDM symbol except for the zeroth, first, second, fourth, seventh, and eleventh OFDM symbols, which may be referred to herein as a first OFDM symbol group. In addition, the zeroth, first, second, fourth, seventh, and eleventh OFDM symbols may be referred to as a second OFDM symbol group.

In addition, since the dedicated reference signal may be punctured in the OFDM symbol in which the CRS, the SCH, and the BCH are located, and the last OFDM symbol of one subframe, the first OFDM symbol group in order to guarantee transmission of the dedicated reference signal in every subframe. Among the third, tenth and twelfth OFDM symbols, at least one dedicated reference signal should be allocated, and as many dedicated reference signals as possible should be allocated.

In this regard, as described above, by extrapolating / extrapolating the dedicated reference signal to the resource element to which the dedicated reference signal is not allocated, the channel for the corresponding resource element is estimated to restore the data. Therefore, if all the dedicated reference signals are allocated only to the third, tenth and twelfth OFDM symbols, there is a possibility that the channel estimation performance becomes inefficient. Therefore, in some cases, there is a need to properly allocate the dedicated reference signals to the remaining OFDM symbols. do.

In addition, since the SCH and the BCH are transmitted in 5 subframe and 10 subframe periods, the dedicated reference signals are not punctured on the fifth to ninth OFDM symbols in all subframes, and thus, on the fifth to ninth OFDM symbols. A pattern can also be designed by placing a portion of the dedicated reference signal at.

In addition, the number of resource elements to which a dedicated reference signal is allocated in two resource blocks (resource block pairs) contiguous in time in one subframe may be 24 in total for transmission of rank 8 or less. In this regard, dedicated reference signals for the first and second layers (ranks 1 to 2) are disposed on 12 resource elements, and dedicated reference signals for the third and fourth layers (ranks 3 to 4) are allocated to 8 resources. On the elements, dedicated reference signals for the fifth to eighth layers (ranks 5 to 8) may be disposed on four resource elements.

5 to 54 of various embodiments of the present invention, a resource element to which a dedicated reference signal is mapped in one subframe according to a general CP configuration is shown, with the horizontal axis representing the time domain and the vertical axis representing the frequency domain. Indicates. The smallest rectangular area in the time-frequency domain corresponds to one OFDM symbol in the time domain and one subcarrier in the frequency domain. In addition, the position of the dedicated reference signal may be represented by (OFDM symbol index l, subcarrier index k).

Example  1 (FIGS. 5 and 6)

(One) A (l, k) = {(3,3), (3,7), (3,11), (6,1), (6,5), (6,9), (9,3), (9,7), ( 9,11), (12,1), (12,5), (12,9)} (2) A (l, k) = {(3,3), (3,7), (3,11), (6,1), (6,5), (6,9)} B (l, k) = {(9,3), (9,7), (9,11), (12,1), (12,5), (12,9)} (3) A (l, k) = {(3,3), (3,7), (3,11), (6,1), (6,5), (6,9)} B (l, k) = {(9,3), (9,7), (9,11), (12,1), (12,5), (12,9)} C (l, k) = {(5,4), (5,10), (10,0), (10,7)} D (l, k) = {(5,5), (5,11), (10,1), (10,8)} E ~ H (l, k) = {(5,0), (5,7), (10,3), (10,10)} (4) A (l, k) = {(3,3), (3,7), (3,11), (6,1), (6,5), (6,9)} B (l, k) = {(9,3), (9,7), (9,11), (12,1), (12,5), (12,9)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (10,0), (10,4), (10,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (10,1), (10,5), (10,9)} (5) A (l, k) = {(3,3), (3,7), (3,11), (6,1), (6,5), (6,9), (9,3), (9,7), ( 9,11), (13,1), (13,5), (13,9)} (6) A (l, k) = {(3,3), (3,7), (3,11), (6,1), (6,5), (6,9)} B (l, k) = {(9,3), (9,7), (9,11), (13,1), (13,5), (13,9)} (7) A (l, k) = {(3,3), (3,7), (3,11), (6,1), (6,5), (6,9)} B (l, k) = {(9,3), (9,7), (9,11), (13,1), (13,5), (13,9)} C (l, k) = {(5,4), (5,10), (10,0), (10,7)} D (l, k) = {(5,5), (5,11), (10,1), (10,8)} E ~ H (l, k) = {(5,0), (5,7), (10,3), (10,10)} (8) A (l, k) = {(3,3), (3,7), (3,11), (6,1), (6,5), (6,9)} B (l, k) = {(9,3), (9,7), (9,11), (13,1), (13,5), (13,9)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (10,0), (10,4), (10,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (10,1), (10,5), (10,9)}

Referring to FIG. 5, Embodiment 1- (1) shows a pattern in which a dedicated reference signal for a first layer is disposed at equal intervals of three subcarrier positions in one OFDM symbol for equal rank intervals for rank 1 transmission. Define. The dedicated reference signal for the first layer is disposed on 12 resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

Embodiment 1- (2) is for rank 2 transmission, and the dedicated reference signal for the second layer in the second slot portion of the subframe in the dedicated reference signal pattern for the first layer set in embodiment 1- (1). It is placed. In two consecutive resource blocks (resource block pairs) in time of one subframe, dedicated reference signals for the first and second layers are disposed on 6 resource elements, respectively.

Embodiment 1- (3) is for rank 8 transmission, and uses the dedicated reference signal patterns for the first and second layers of embodiment 1- (2) as it is, and additionally for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third and fourth layers are disposed on four resource elements, respectively, and are arranged on subcarriers concatenated on one OFDM symbol and multiplexed using the FDM scheme. The dedicated reference signals for the fifth to eighth layers are disposed on 4 resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 1- (4) is for rank 8 transmission, and uses the dedicated reference signal patterns for the first and second layers of embodiment 1- (2) as it is, and additionally for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third, fifth and seventh layers are disposed on 6 resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the fourth, sixth, and eighth layers are disposed on six resource elements and multiplexed in a CDM manner in one resource element.

Embodiments 1- (5) to 1- (8) shown in FIG. 6 show a dedicated reference signal located on a twelfth OFDM symbol in Embodiments 1- (1) to 1- (4) of FIG. It is a modified example arrange | positioned on an OFDM symbol.

Example  2 (FIGS. 7 and 8)

(One) A (l, k) = {(3,3), (3,7), (3,11), (6,3), (6,7), (6,11), (9,1), (9,5), ( 9,9), (12,1), (12,5), (12,9)} (2) A (l, k) = {(3,3), (3,7), (3,11), (9,1), (9,5), (9,9)} B (l, k) = {(6,3), (6,7), (6,11), (12,1), (12,5), (12,9)} (3) A (l, k) = {(3,3), (3,7), (3,11), (9,1), (9,5), (9,9)} B (l, k) = {(6,3), (6,7), (6,11), (12,1), (12,5), (12,9)} C (l, k) = {(5,4), (5,10), (10,0), (10,7)} D (l, k) = {(5,5), (5,11), (10,1), (10,8)} E ~ H (l, k) = {(5,0), (5,7), (10,3), (10,10)} (4) A (l, k) = {(3,3), (3,7), (3,11), (9,1), (9,5), (9,9)} B (l, k) = {(6,3), (6,7), (6,11), (12,1), (12,5), (12,9)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (10,0), (10,4), (10,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (10,1), (10,5), (10,9)} (5) A (l, k) = {(3,3), (3,7), (3,11), (6,3), (6,7), (6,11), (9,1), (9,5), ( 9,9), (13,1), (13,5), (13,9)} (6) A (l, k) = {(3,3), (3,7), (3,11), (9,1), (9,5), (9,9)} B (l, k) = {(6,3), (6,7), (6,11), (13,1), (13,5), (13,9)} (7) A (l, k) = {(3,3), (3,7), (3,11), (9,1), (9,5), (9,9)} B (l, k) = {(6,3), (6,7), (6,11), (13,1), (13,5), (13,9)} C (l, k) = {(5,4), (5,10), (10,0), (10,7)} D (l, k) = {(5,5), (5,11), (10,1), (10,8)} E ~ H (l, k) = {(5,0), (5,7), (10,3), (10,10)} (8) A (l, k) = {(3,3), (3,7), (3,11), (9,1), (9,5), (9,9)} B (l, k) = {(6,3), (6,7), (6,11), (13,1), (13,5), (13,9)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (10,0), (10,4), (10,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (10,1), (10,5), (10,9)}

Referring to FIG. 7, in Embodiment 2- (1), a pattern in which a dedicated reference signal for a first layer is disposed at equal intervals and three subcarrier positions in one OFDM symbol for rank 1 transmission is performed on equal intervals. Define. The dedicated reference signal for the first layer is disposed on 12 resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

In Embodiment 2- (2), a dedicated reference signal for rank 2 transmission is disposed at the same resource element position as Embodiment 2- (1), and the dedicated reference signals for the first and second layers are crossed for each OFDM symbol. To place.

Embodiment 2- (3) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 2- (2) as they are, and additionally for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third and fourth layers are disposed on four resource elements, respectively, and are arranged on subcarriers concatenated on one OFDM symbol and multiplexed using the FDM scheme. The dedicated reference signals for the fifth to eighth layers are disposed on 4 resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 2- (4) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 2- (2) as they are, and additionally dedicated for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third, fifth and seventh layers are disposed on 6 resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the fourth, sixth, and eighth layers are disposed on six resource elements and multiplexed in a CDM manner in one resource element.

Embodiments 2- (5) to 2- (8) shown in FIG. 8 use a dedicated reference signal located on a twelfth OFDM symbol in Embodiments 2- (1) to 2- (4) of FIG. It is a modified example arrange | positioned on an OFDM symbol.

Example  3 (FIGS. 9 and 10)

(One) A (l, k) = ((3,0), (3,5), (3,10), (8,0), (8,5), (8,10), (12,0), (12,5), ( 12,10)} (2) A (l, k) = {(3,0), (3,5), (3,10), (10,0), (10,5), (10,10)} B (l, k) = {(5,0), (5,5), (5,10), (12,0), (12,5), (12,10)} (3) A (l, k) = {(3,0), (3,5), (3,10), (10,0), (10,5), (10,10)} B (l, k) = {(5,0), (5,5), (5,10), (12,0), (12,5), (12,10)} C (l, k) = {(6,4), (6,10), (9,0), (9,7)} D (l, k) = {(6,5), (6,11), (9,1), (9,8)} E ~ H (l, k) = {(6,0), (6,7), (9,3), (9,10)} (4) A (l, k) = {(3,0), (3,5), (3,10), (10,0), (10,5), (10,10)} B (l, k) = {(5,0), (5,5), (5,10), (12,0), (12,5), (12,10)} C / E / G (l, k) = {(6,2), (6,6), (6,10), (9,0), (9,4), (9,8)} D / F / H (l, k) = {(6,3), (6,7), (6,11), (9,1), (9,5), (9,9)} (5) A (l, k) = ((3,0), (3,5), (3,10), (8,0), (8,5), (8,10), (13,0), (13,5), ( 13,10)} (6) A (l, k) = {(3,0), (3,5), (3,10), (10,0), (10,5), (10,10)} B (l, k) = {(5,0), (5,5), (5,10), (13,0), (13,5), (13,10)} (7) A (l, k) = {(3,0), (3,5), (3,10), (10,0), (10,5), (10,10)} B (l, k) = {(5,0), (5,5), (5,10), (13,0), (13,5), (13,10)} C (l, k) = {(6,4), (6,10), (9,0), (9,7)} D (l, k) = {(6,5), (6,11), (9,1), (9,8)} E ~ H (l, k) = {(6,0), (6,7), (9,3), (9,10)} (8) A (l, k) = {(3,0), (3,5), (3,10), (10,0), (10,5), (10,10)} B (l, k) = {(5,0), (5,5), (5,10), (13,0), (13,5), (13,10)} C / E / G (l, k) = {(6,2), (6,6), (6,10), (9,0), (9,4), (9,8)} D / F / H (l, k) = {(6,3), (6,7), (6,11), (9,1), (9,5), (9,9)}

Referring to FIG. 9, Embodiment 3- (1) defines a pattern in which a dedicated reference signal for a first layer is disposed at three OFDM symbols at equal intervals in one OFDM symbol for three rank symbols for rank 1 transmission. . The dedicated reference signal for the first layer is disposed on nine resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

In Embodiment 3- (2), in addition to Embodiment 3- (1), a dedicated reference signal for the second layer is disposed on nine resource elements at two OFDM symbol intervals for the dedicated reference signal for the first layer. In this case, a dedicated reference signal is disposed on 18 resource elements for rank 2 transmission.

Embodiment 3- (3) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 3- (2) as it is, and additionally for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third and fourth layers are disposed on four resource elements, respectively, and are arranged on subcarriers concatenated on one OFDM symbol and multiplexed using the FDM scheme. The dedicated reference signals for the fifth to eighth layers are disposed on 4 resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 3- (4) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 3- (2) as it is, and additionally for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third, fifth and seventh layers are disposed on 6 resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the fourth, sixth, and eighth layers are disposed on six resource elements and multiplexed in a CDM manner in one resource element.

Embodiments 3- (5) to 3- (8) shown in FIG. 10 use a dedicated reference signal located on a twelfth OFDM symbol in Embodiments 3- (1) to 3- (4) of FIG. 9. It is a modified example arrange | positioned on an OFDM symbol.

Example  4 (FIGS. 11 and 12)

(One) A (l, k) = {(3,0), (3,1), (3,2), (3,9), (3,10), (3,11), (10,0), (10,1), ( 10,2), (10,9), (10,10), (10,11)} (2) A (l, k) = {(3,0), (3,2), (3,10), (10,1), (10,9), (10,11)} B (l, k) = {(3,1), (3,9), (3,11), (10,0), (10,2), (10,10)} (3) A (l, k) = {(3,0), (3,2), (3,10), (10,1), (10,9), (10,11)} B (l, k) = {(3,1), (3,9), (3,11), (10,0), (10,2), (10,10)} C (l, k) = {(5,4), (5,10), (12,0), (12,7)} D (l, k) = {(5,5), (5,11), (12,1), (12,8)} E ~ H (l, k) = {(5,0), (5,7), (12,3), (12,10)} (4) A (l, k) = {(3,0), (3,2), (3,10), (10,1), (10,9), (10,11)} B (l, k) = {(3,1), (3,9), (3,11), (10,0), (10,2), (10,10)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (12,0), (12,4), (12,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (12,1), (12,5), (12,9)} (5) A (l, k) = {(3,0), (3,1), (3,2), (3,9), (3,10), (3,11), (10,0), (10,1), ( 10,2), (10,9), (10,10), (10,11)} (6) A (l, k) = {(3,0), (3,2), (3,10), (10,1), (10,9), (10,11)} B (l, k) = {(3,1), (3,9), (3,11), (10,0), (10,2), (10,10)} (7) A (l, k) = {(3,0), (3,2), (3,10), (10,1), (10,9), (10,11)} B (l, k) = {(3,1), (3,9), (3,11), (10,0), (10,2), (10,10)} C (l, k) = {(5,4), (5,10), (13,0), (13,7)} D (l, k) = {(5,5), (5,11), (13,1), (13,8)} E ~ H (l, k) = {(5,0), (5,7), (13,3), (13,10)} (8) A (l, k) = {(3,0), (3,2), (3,10), (10,1), (10,9), (10,11)} B (l, k) = {(3,1), (3,9), (3,11), (10,0), (10,2), (10,10)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (13,0), (13,4), (13,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (13,1), (13,5), (13,9)}

With reference to FIG. 11, in Embodiment 4- (1), a dedicated reference signal for a first layer is arranged in two groups of three subcarriers contiguous in one OFDM symbol on two OFDM symbols for rank 1 transmission. Define the pattern. The dedicated reference signal for the first layer is disposed on 12 resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

Embodiment 4- (2) allocates a dedicated reference signal for the second layer on six resource elements among positions of the dedicated reference signal of the embodiment 4- (1), and dedicated reference for the first and second layers. The signals are arranged crosswise in the frequency domain on one OFDM symbol.

Embodiment 4- (3) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 4- (2) as it is, and additionally for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third and fourth layers are disposed on four resource elements, respectively, and are arranged on subcarriers concatenated on one OFDM symbol and multiplexed using the FDM scheme. The dedicated reference signals for the fifth to eighth layers are disposed on 4 resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 4- (4) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 4- (2) as it is, and additionally for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third, fifth and seventh layers are disposed on 6 resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the fourth, sixth, and eighth layers are disposed on six resource elements and multiplexed in a CDM manner in one resource element.

Embodiments 4- (5) to 4- (8) shown in FIG. 12 use a dedicated reference signal located on a twelfth OFDM symbol in Embodiments 4- (1) to 4- (4) of FIG. It is a modified example arrange | positioned on an OFDM symbol.

Example  5 (FIGS. 13 and 14)

(One) A (l, k) = {(3,0), (3,1), (3,5), (3,6), (3,10), (3,11), (10,0), (10,1), ( 10,5), (10,6), (10,10), (10,11)} (2) A (l, k) = {(3,0), (3,5), (3,10), (10,1), (10,6), (10,11)} B (l, k) = {(3,1), (3,6), (3,11), (10,0), (10,5), (10,10)} (3) A (l, k) = {(3,0), (3,5), (3,10), (10,1), (10,6), (10,11)} B (l, k) = {(3,1), (3,6), (3,11), (10,0), (10,5), (10,10)} C (l, k) = {(5,4), (5,10), (12,0), (12,7)} D (l, k) = {(5,5), (5,11), (12,1), (12,8)} E ~ H (l, k) = {(5,0), (5,7), (12,3), (12,10)} (4) A (l, k) = {(3,0), (3,5), (3,10), (10,1), (10,6), (10,11)} B (l, k) = {(3,1), (3,6), (3,11), (10,0), (10,5), (10,10)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (12,0), (12,4), (12,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (12,1), (12,5), (12,9)} (5) A (l, k) = {(3,0), (3,1), (3,5), (3,6), (3,10), (3,11), (10,0), (10,1), ( 10,5), (10,6), (10,10), (10,11)} (6) A (l, k) = {(3,0), (3,5), (3,10), (10,1), (10,6), (10,11)} B (l, k) = {(3,1), (3,6), (3,11), (10,0), (10,5), (10,10)} (7) A (l, k) = {(3,0), (3,5), (3,10), (10,1), (10,6), (10,11)} B (l, k) = {(3,1), (3,6), (3,11), (10,0), (10,5), (10,10)} C (l, k) = {(5,4), (5,10), (13,0), (13,7)} D (l, k) = {(5,5), (5,11), (13,1), (13,8)} E ~ H (l, k) = {(5,0), (5,7), (13,3), (13,10)} (8) A (l, k) = {(3,0), (3,5), (3,10), (10,1), (10,6), (10,11)} B (l, k) = {(3,1), (3,6), (3,11), (10,0), (10,5), (10,10)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (13,0), (13,4), (13,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (13,1), (13,5), (13,9)}

Referring to FIG. 13, Embodiment 5- (1) defines a pattern in which a dedicated reference signal for a first layer is arranged in three groups of two subcarriers concatenated in one OFDM symbol on two OFDM symbols for rank 1 transmission. do. The dedicated reference signal for the first layer is disposed on 12 resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

Embodiment 5- (2) allocates a dedicated reference signal for the second layer on six resource elements among positions of the dedicated reference signal of Embodiment 5- (1), and dedicated reference for the first and second layers. The signals are arranged crosswise in the frequency domain on one OFDM symbol.

Embodiment 5- (3) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 5- (2) as it is, and additionally for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third and fourth layers are disposed on four resource elements, respectively, and are arranged on subcarriers concatenated on one OFDM symbol and multiplexed using the FDM scheme. The dedicated reference signals for the fifth to eighth layers are disposed on 4 resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 5- (4) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 5- (2) as it is, and additionally for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third, fifth and seventh layers are disposed on 6 resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the fourth, sixth, and eighth layers are disposed on six resource elements and multiplexed in a CDM manner in one resource element.

Embodiments 5- (5) to 5- (8) shown in FIG. 14 use a dedicated reference signal located on a twelfth OFDM symbol in Embodiments 5- (1) to 5- (4) of FIG. It is a modified example arrange | positioned on an OFDM symbol.

Example  6 (FIGS. 15 and 16)

(One) A (l, k) = {(3,0), (3,1), (3,10), (3,11), (5,5), (5,6), (8,5), (8,6), ( 10,0), (10,1), (10,10), (10,11)} (2) A (l, k) = {(3,0), (3,10), (5,5), (8,6), (10,1), (10,11)} B (l, k) = {(3,1), (3,11), (5,6), (8,5), (10,0), (10,10)} (3) A (l, k) = {(3,0), (3,10), (5,5), (8,6), (10,1), (10,11)} B (l, k) = {(3,1), (3,11), (5,6), (8,5), (10,0), (10,10)} C (l, k) = {(6,4), (6,10), (12,0), (12,7)} D (l, k) = {(6,5), (6,11), (12,1), (12,8)} E ~ H (l, k) = {(6,0), (6,7), (12,3), (12,10)} (4) A (l, k) = {(3,0), (3,10), (5,5), (8,6), (10,1), (10,11)} B (l, k) = {(3,1), (3,11), (5,6), (8,5), (10,0), (10,10)} C / E / G (l, k) = {(6,2), (6,6), (6,10), (12,0), (12,4), (12,8)} D / F / H (l, k) = {(6,3), (6,7), (6,11), (12,1), (12,5), (12,9)} (5) A (l, k) = {(3,0), (3,1), (3,10), (3,11), (5,5), (5,6), (8,5), (8,6), ( 10,0), (10,1), (10,10), (10,11)} (6) A (l, k) = {(3,0), (3,10), (5,5), (8,6), (10,1), (10,11)} B (l, k) = {(3,1), (3,11), (5,6), (8,5), (10,0), (10,10)} (7) A (l, k) = {(3,0), (3,10), (5,5), (8,6), (10,1), (10,11)} B (l, k) = {(3,1), (3,11), (5,6), (8,5), (10,0), (10,10)} C (l, k) = {(6,4), (6,10), (13,0), (13,7)} D (l, k) = {(6,5), (6,11), (13,1), (13,8)} E ~ H (l, k) = {(6,0), (6,7), (13,3), (13,10)} (8) A (l, k) = {(3,0), (3,10), (5,5), (8,6), (10,1), (10,11)} B (l, k) = {(3,1), (3,11), (5,6), (8,5), (10,0), (10,10)} C / E / G (l, k) = {(6,2), (6,6), (6,10), (13,0), (13,4), (13,8)} D / F / H (l, k) = {(6,3), (6,7), (6,11), (13,1), (13,5), (13,9)}

Referring to FIG. 15, in Embodiment 6- (1), a dedicated reference signal for a first layer is disposed on 4 OFDM symbols for rank 1 transmission. Dedicated reference signals are arranged in two groups of concatenated two subcarriers, respectively, in the first and fourth OFDM symbols on which the dedicated reference signals are arranged, and dedicated reference signals are arranged in concatenated two subcarriers in the second and third OFDM symbols, respectively. The dedicated reference signal for the first layer is disposed on 12 resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

Embodiment 6- (2) allocates a dedicated reference signal for the second layer on six resource elements among positions of the dedicated reference signal of Embodiment 6- (1), and dedicated reference for the first and second layers. The signals are arranged crosswise in the frequency domain on one OFDM symbol.

Embodiment 6- (3) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 6- (2) as it is, and additionally dedicated for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third and fourth layers are disposed on four resource elements, respectively, and are arranged on subcarriers concatenated on one OFDM symbol and multiplexed using the FDM scheme. The dedicated reference signals for the fifth to eighth layers are disposed on 4 resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 6- (4) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 6- (2) as they are, and additionally dedicated for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third, fifth and seventh layers are disposed on 6 resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the fourth, sixth, and eighth layers are disposed on six resource elements and multiplexed in a CDM manner in one resource element.

Embodiments 6- (5) to 6- (8) shown in FIG. 16 use dedicated reference signals located on the twelfth OFDM symbol in Embodiments 6- (1) to 6- (4) of FIG. It is a modified example arrange | positioned on an OFDM symbol.

Example  7 (FIGS. 17 and 18)

(One) A (l, k) = {(3,0), (3,4), (3,8), (10,3), (10,7), (10,11)} (2) A (l, k) = {(3,0), (3,4), (3,8), (10,3), (10,7), (10,11)} B (l, k) = {(5,0), (5,4), (5,8), (12,3), (12,7), (12,11)} (3) A (l, k) = {(3,0), (3,4), (3,8), (10,3), (10,7), (10,11)} B (l, k) = {(5,0), (5,4), (5,8), (12,3), (12,7), (12,11)} C (l, k) = {(6,4), (6,10), (9,0), (9,7)} D (l, k) = {(6,5), (6,11), (9,1), (9,8)} E ~ H (l, k) = {(6,0), (6,7), (9,3), (9,10)} (4) A (l, k) = {(3,0), (3,4), (3,8), (10,3), (10,7), (10,11)} B (l, k) = {(5,0), (5,4), (5,8), (12,3), (12,7), (12,11)} C / E / G (l, k) = {(6,2), (6,6), (6,10), (9,0), (9,4), (9,8)} D / F / H (l, k) = {(6,3), (6,7), (6,11), (9,1), (9,5), (9,9)} (5) A (l, k) = {(3,0), (3,4), (3,8), (10,3), (10,7), (10,11)} (6) A (l, k) = {(3,0), (3,4), (3,8), (10,3), (10,7), (10,11)} B (l, k) = {(5,0), (5,4), (5,8), (13,3), (13,7), (13,11)} (7) A (l, k) = {(3,0), (3,4), (3,8), (10,3), (10,7), (10,11)} B (l, k) = {(5,0), (5,4), (5,8), (13,3), (13,7), (13,11)} C (l, k) = {(6,4), (6,10), (9,0), (9,7)} D (l, k) = {(6,5), (6,11), (9,1), (9,8)} E ~ H (l, k) = {(6,0), (6,7), (9,3), (9,10)} (8) A (l, k) = {(3,0), (3,4), (3,8), (10,3), (10,7), (10,11)} B (l, k) = {(5,0), (5,4), (5,8), (13,3), (13,7), (13,11)} C / E / G (l, k) = {(6,2), (6,6), (6,10), (9,0), (9,4), (9,8)} D / F / H (l, k) = {(6,3), (6,7), (6,11), (9,1), (9,5), (9,9)}

Referring to FIG. 17, in Embodiment 7- (1), a dedicated reference signal for a first layer is disposed at three subcarrier positions at equal intervals on two OFDM symbols for rank 1 transmission. The dedicated reference signal for the first layer is disposed on 6 resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

Embodiment 7- (2) arranges a dedicated reference signal for the second layer on 6 resource elements in addition to the position of the dedicated reference signal of the embodiment 7- (1), and dedicated to the first and second layers. The reference signal has a 2 OFDM symbol interval on the same subcarrier.

Embodiment 7- (3) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 7- (2) as they are, and additionally for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third and fourth layers are disposed on four resource elements, respectively, and are arranged on subcarriers concatenated on one OFDM symbol and multiplexed using the FDM scheme. The dedicated reference signals for the fifth to eighth layers are disposed on 4 resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 7- (4) is for rank 8 transmission, and uses the dedicated reference signal patterns for the first and second layers of embodiment 7- (2) as it is, and additionally for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third, fifth and seventh layers are disposed on 6 resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the fourth, sixth, and eighth layers are disposed on six resource elements and multiplexed in a CDM manner in one resource element.

Embodiments 7- (5) to 7- (8) shown in FIG. 18 apply dedicated reference signals located on a twelfth OFDM symbol in embodiments 7- (1) to 7- (4) of FIG. It is a modified example arrange | positioned on an OFDM symbol.

Example  8 (FIGS. 19 and 20)

(One) A (l, k) = ((3,0), (3,4), (3,8), (5,0), (5,4), (5,8), (10,3), (10,7), ( 10,11), (12,3), (12,7), (12,11)} (2) A (l, k) = {(3,0), (3,4), (3,8), (10,3), (10,7), (10,11)} B (l, k) = {(5,0), (5,4), (5,8), (12,3), (12,7), (12,11)} (3) A (l, k) = {(3,0), (3,4), (3,8), (10,3), (10,7), (10,11)} B (l, k) = {(5,0), (5,4), (5,8), (12,3), (12,7), (12,11)} C (l, k) = {(6,4), (6,10), (9,0), (9,7)} D (l, k) = {(6,5), (6,11), (9,1), (9,8)} E ~ H (l, k) = {(6,0), (6,7), (9,3), (9,10)} (4) A (l, k) = {(3,0), (3,4), (3,8), (10,3), (10,7), (10,11)} B (l, k) = {(5,0), (5,4), (5,8), (12,3), (12,7), (12,11)} C / E / G (l, k) = {(6,2), (6,6), (6,10), (9,0), (9,4), (9,8)} D / F / H (l, k) = {(6,3), (6,7), (6,11), (9,1), (9,5), (9,9)} (5) A (l, k) = ((3,0), (3,4), (3,8), (5,0), (5,4), (5,8), (10,3), (10,7), ( 10,11), (13,3), (13,7), (13,11)} (6) A (l, k) = {(3,0), (3,4), (3,8), (10,3), (10,7), (10,11)} B (l, k) = {(5,0), (5,4), (5,8), (13,3), (13,7), (13,11)} (7) A (l, k) = {(3,0), (3,4), (3,8), (10,3), (10,7), (10,11)} B (l, k) = {(5,0), (5,4), (5,8), (13,3), (13,7), (13,11)} C (l, k) = {(6,4), (6,10), (9,0), (9,7)} D (l, k) = {(6,5), (6,11), (9,1), (9,8)} E ~ H (l, k) = {(6,0), (6,7), (9,3), (9,10)} (8) A (l, k) = {(3,0), (3,4), (3,8), (10,3), (10,7), (10,11)} B (l, k) = {(5,0), (5,4), (5,8), (13,3), (13,7), (13,11)} C / E / G (l, k) = {(6,2), (6,6), (6,10), (9,0), (9,4), (9,8)} D / F / H (l, k) = {(6,3), (6,7), (6,11), (9,1), (9,5), (9,9)}

Referring to FIG. 19, in Embodiment 8- (1), a dedicated reference signal for a first layer is arranged at three subcarrier positions on 4 OFDM symbols at equal intervals for rank 1 transmission. The dedicated reference signal for the first layer is disposed on 12 resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

Embodiment 8- (2) arranges a dedicated reference signal for the second layer on 6 resource elements among positions of the dedicated reference signal of Embodiment 8- (1), and dedicated reference for the first and second layers. The signal has two OFDM symbol intervals on the same subcarrier.

Embodiment 8- (3) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 8- (2) as it is, and additionally dedicated for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third and fourth layers are disposed on four resource elements, respectively, and are arranged on subcarriers concatenated on one OFDM symbol and multiplexed using the FDM scheme. The dedicated reference signals for the fifth to eighth layers are disposed on 4 resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 8- (4) is for rank 8 transmission, and uses the dedicated reference signal patterns for the first and second layers of embodiment 8- (2) as it is, and additionally for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third, fifth and seventh layers are disposed on 6 resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the fourth, sixth, and eighth layers are disposed on six resource elements and multiplexed in a CDM manner in one resource element.

Embodiments 8- (5) to 8- (8) shown in FIG. 20 use a dedicated reference signal located on a twelfth OFDM symbol in Embodiments 8- (1) to 8- (4) of FIG. It is a modified example arrange | positioned on an OFDM symbol.

Example  9 (FIGS. 21 and 22)

(One) A (l, k) = {(3,0), (3,6), (5,3), (5,9), (10,0), (10,6), (12,3), (12,9)} (2) A (l, k) = {(3,0), (3,6), (5,3), (5,9), (10,0), (10,6), (12,3), (12,9)} B (l, k) = {(3,3), (3,9), (12,0), (12,6)} (3) A (l, k) = {(3,0), (3,6), (5,3), (5,9), (10,0), (10,6), (12,3), (12,9)} B (l, k) = {(3,3), (3,9), (12,0), (12,6)} C (l, k) = {(6,4), (6,10), (9,0), (9,7)} D (l, k) = {(6,5), (6,11), (9,1), (9,8)} E ~ H (l, k) = {(6,0), (6,7), (9,3), (9,10)} (4) A (l, k) = {(3,0), (3,6), (5,3), (5,9), (10,0), (10,6), (12,3), (12,9)} B (l, k) = {(3,3), (3,9), (12,0), (12,6)} C / E / G (l, k) = {(6,2), (6,6), (6,10), (9,0), (9,4), (9,8)} D / F / H (l, k) = {(6,3), (6,7), (6,11), (9,1), (9,5), (9,9)} (5) A (l, k) = {(3,0), (3,6), (5,3), (5,9), (10,0), (10,6), (13,3), (13,9)} (6) A (l, k) = {(3,0), (3,6), (5,3), (5,9), (10,0), (10,6), (13,3), (13,9)} B (l, k) = {(3,3), (3,9), (13,0), (13,6)} (7) A (l, k) = {(3,0), (3,6), (5,3), (5,9), (10,0), (10,6), (13,3), (13,9)} B (l, k) = {(3,3), (3,9), (13,0), (13,6)} C (l, k) = {(6,4), (6,10), (9,0), (9,7)} D (l, k) = {(6,5), (6,11), (9,1), (9,8)} E ~ H (l, k) = {(6,0), (6,7), (9,3), (9,10)} (8) A (l, k) = {(3,0), (3,6), (5,3), (5,9), (10,0), (10,6), (13,3), (13,9)} B (l, k) = {(3,3), (3,9), (13,0), (13,6)} C / E / G (l, k) = {(6,2), (6,6), (6,10), (9,0), (9,4), (9,8)} D / F / H (l, k) = {(6,3), (6,7), (6,11), (9,1), (9,5), (9,9)}

Referring to FIG. 21, in Embodiment 9- (1), a dedicated reference signal for a first layer is disposed at 2 subcarrier positions on 4 OFDM symbols for rank 1 transmission. The dedicated reference signal for the first layer is disposed on eight resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

Embodiment 9- (2) arranges a dedicated reference signal for a second layer on 4 resource elements in addition to the position of the dedicated reference signal of Embodiment 9- (1), and the OFDM symbol in which the second reference signal is disposed The first and second OFDM symbols are arranged in the frequency domain at the intersection.

Embodiment 9- (3) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 9- (2) as they are, and additionally dedicated to the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third and fourth layers are disposed on four resource elements, respectively, and are arranged on subcarriers concatenated on one OFDM symbol and multiplexed using the FDM scheme. The dedicated reference signals for the fifth to eighth layers are disposed on 4 resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 9- (4) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 9- (2) as it is, and additionally dedicated to the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third, fifth and seventh layers are disposed on 6 resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the fourth, sixth, and eighth layers are disposed on six resource elements and multiplexed in a CDM manner in one resource element.

Embodiments 9- (5) to 9- (8) shown in FIG. 22 use a dedicated reference signal located on a twelfth OFDM symbol in embodiments 9- (1) to 9- (4) of FIG. 21. It is a modified example arrange | positioned on an OFDM symbol.

Example  10 (Figures 23 and 24)

(One) A (l, k) = {(3,0), (3,6), (8,1), (8,7), (12,3), (12,9)} (2) A (l, k) = {(3,0), (3,6), (8,1), (8,7), (12,3), (12,9)} B (l, k) = {(3,3), (3,9), (6,1), (6,7), (12,0), (12,6)} (3) A (l, k) = {(3,0), (3,6), (8,1), (8,7), (12,3), (12,9)} B (l, k) = {(3,3), (3,9), (6,1), (6,7), (12,0), (12,6)} C (l, k) = {(5,4), (5,10), (10,0), (10,7)} D (l, k) = {(5,5), (5,11), (10,1), (10,8)} E ~ H (l, k) = {(5,0), (5,7), (10,3), (10,10)} (4) A (l, k) = {(3,0), (3,6), (8,1), (8,7), (12,3), (12,9)} B (l, k) = {(3,3), (3,9), (6,1), (6,7), (12,0), (12,6)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (10,0), (10,4), (10,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (10,1), (10,5), (10,9)} (5) A (l, k) = {(3,0), (3,6), (8,1), (8,7), (13,3), (13,9)} (6) A (l, k) = {(3,0), (3,6), (8,1), (8,7), (13,3), (13,9)} B (l, k) = {(3,3), (3,9), (6,1), (6,7), (13,0), (13,6)} (7) A (l, k) = {(3,0), (3,6), (8,1), (8,7), (13,3), (13,9)} B (l, k) = {(3,3), (3,9), (6,1), (6,7), (13,0), (13,6)} C (l, k) = {(5,4), (5,10), (10,0), (10,7)} D (l, k) = {(5,5), (5,11), (10,1), (10,8)} E ~ H (l, k) = {(5,0), (5,7), (10,3), (10,10)} (8) A (l, k) = {(3,0), (3,6), (8,1), (8,7), (13,3), (13,9)} B (l, k) = {(3,3), (3,9), (6,1), (6,7), (13,0), (13,6)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (10,0), (10,4), (10,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (10,1), (10,5), (10,9)}

Referring to FIG. 23, in Embodiment 10- (1), a dedicated reference signal for a first layer is disposed at two subcarrier positions on three OFDM symbols for rank 1 transmission. The dedicated reference signal for the first layer is disposed on 6 resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

Embodiment 10- (2) arranges a dedicated reference signal for the second layer on 6 resource elements in addition to the position of the dedicated reference signal of Embodiment 10- (1), wherein the first and second reference signals are combined together. On the arranged OFDM symbols, the first and second OFDM symbols are arranged in the frequency domain at the intersection.

Embodiment 10- (3) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 10- (2) as they are, and additionally dedicated for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third and fourth layers are disposed on four resource elements, respectively, and are arranged on subcarriers concatenated on one OFDM symbol and multiplexed using the FDM scheme. The dedicated reference signals for the fifth to eighth layers are disposed on 4 resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 10- (4) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 10- (2) as it is, and additionally dedicated for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third, fifth and seventh layers are disposed on 6 resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the fourth, sixth, and eighth layers are disposed on six resource elements and multiplexed in a CDM manner in one resource element.

Embodiments 10- (5) to 10- (8) shown in FIG. 24 use a dedicated reference signal located on a twelfth OFDM symbol in embodiments 10- (1) to 10- (4) of FIG. It is a modified example arrange | positioned on an OFDM symbol.

Example  11 (FIGS. 25 and 26)

(One) A (l, k) = {(3,0), (3,6), (8,3), (8,9), (12,0), (12,6)} (2) A (l, k) = {(3,0), (3,6), (8,3), (8,9), (12,0), (12,6)} B (l, k) = {(3,3), (3,9), (8,0), (8,6), (12,3), (12,9)} (3) A (l, k) = {(3,0), (3,6), (8,3), (8,9), (12,0), (12,6)} B (l, k) = {(3,3), (3,9), (8,0), (8,6), (12,3), (12,9)} C (l, k) = {(5,4), (5,10), (10,0), (10,7)} D (l, k) = {(5,5), (5,11), (10,1), (10,8)} E ~ H (l, k) = {(5,0), (5,7), (10,3), (10,10)} (4) A (l, k) = {(3,0), (3,6), (8,3), (8,9), (12,0), (12,6)} B (l, k) = {(3,3), (3,9), (8,0), (8,6), (12,3), (12,9)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (10,0), (10,4), (10,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (10,1), (10,5), (10,9)} (5) A (l, k) = {(3,0), (3,6), (8,3), (8,9), (13,0), (13,6)} (6) A (l, k) = {(3,0), (3,6), (8,3), (8,9), (13,0), (13,6)} B (l, k) = {(3,3), (3,9), (8,0), (8,6), (13,3), (13,9)} (7) A (l, k) = {(3,0), (3,6), (8,3), (8,9), (13,0), (13,6)} B (l, k) = {(3,3), (3,9), (8,0), (8,6), (13,3), (13,9)} C (l, k) = {(5,4), (5,10), (10,0), (10,7)} D (l, k) = {(5,5), (5,11), (10,1), (10,8)} E ~ H (l, k) = {(5,0), (5,7), (10,3), (10,10)} (8) A (l, k) = {(3,0), (3,6), (8,3), (8,9), (13,0), (13,6)} B (l, k) = {(3,3), (3,9), (8,0), (8,6), (13,3), (13,9)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (10,0), (10,4), (10,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (10,1), (10,5), (10,9)}

Referring to FIG. 25, in Embodiment 11- (1), a dedicated reference signal for a first layer is disposed at two subcarrier positions on three OFDM symbols for rank 1 transmission. The dedicated reference signal for the first layer is disposed on 6 resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

Embodiment 11- (2) arranges a dedicated reference signal for the second layer on 6 resource elements in addition to the position of the dedicated reference signal of Embodiment 11- (1), wherein the first and second reference signals are combined together. On the arranged OFDM symbols, the first and second OFDM symbols are arranged in the frequency domain at the intersection.

Embodiment 11- (3) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 11- (2) as it is, and additionally dedicated for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third and fourth layers are disposed on four resource elements, respectively, and are arranged on subcarriers concatenated on one OFDM symbol and multiplexed using the FDM scheme. The dedicated reference signals for the fifth to eighth layers are disposed on 4 resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 11- (4) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 11- (2) as it is, and additionally dedicated for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third, fifth and seventh layers are disposed on 6 resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the fourth, sixth, and eighth layers are disposed on six resource elements and multiplexed in a CDM manner in one resource element.

Embodiments 11- (5) to 11- (8) shown in Fig. 26 show a dedicated reference signal located on a twelfth OFDM symbol in Embodiments 11- (1) to 11- (4) of Fig. 25; It is a modified example arrange | positioned on an OFDM symbol.

Example  12 (FIGS. 27 and 28)

(One) A (l, k) = {(3,0), (3,6), (6,3), (6,9), (9,0), (9,6), (12,3), (12,9)} (2) A (l, k) = {(3,0), (3,6), (12,3), (12,9)} B (l, k) = {(3,3), (3,9), (12,0), (12,6)} A / B (l, k) = {(6,3), (6,9), (9,0), (9,6)} (3) A (l, k) = {(3,0), (3,6), (12,3), (12,9)} B (l, k) = {(3,3), (3,9), (12,0), (12,6)} A / B (l, k) = {(6,3), (6,9), (9,0), (9,6)} C (l, k) = {(5,4), (5,10), (10,0), (10,7)} D (l, k) = {(5,5), (5,11), (10,1), (10,8)} E ~ H (l, k) = {(5,0), (5,7), (10,3), (10,10)} (4) A (l, k) = {(3,0), (3,6), (12,3), (12,9)} B (l, k) = {(3,3), (3,9), (12,0), (12,6)} A / B (l, k) = {(6,3), (6,9), (9,0), (9,6)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (10,0), (10,4), (10,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (10,1), (10,5), (10,9)} (5) A (l, k) = {(3,0), (3,6), (6,3), (6,9), (9,0), (9,6), (13,3), (13,9)} (6) A (l, k) = {(3,0), (3,6), (13,3), (13,9)} B (l, k) = {(3,3), (3,9), (13,0), (13,6)} A / B (l, k) = {(6,3), (6,9), (9,0), (9,6)} (7) A (l, k) = {(3,0), (3,6), (13,3), (13,9)} B (l, k) = {(3,3), (3,9), (13,0), (13,6)} A / B (l, k) = {(6,3), (6,9), (9,0), (9,6)} C (l, k) = {(5,4), (5,10), (10,0), (10,7)} D (l, k) = {(5,5), (5,11), (10,1), (10,8)} E ~ H (l, k) = {(5,0), (5,7), (10,3), (10,10)} (8) A (l, k) = {(3,0), (3,6), (13,3), (13,9)} B (l, k) = {(3,3), (3,9), (13,0), (13,6)} A / B (l, k) = {(6,3), (6,9), (9,0), (9,6)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (10,0), (10,4), (10,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (10,1), (10,5), (10,9)}

Referring to FIG. 27, in Embodiment 12- (1), a dedicated reference signal for a first layer is disposed at two subcarrier positions on 4 OFDM symbols for rank 1 transmission. The dedicated reference signal for the first layer is disposed on eight resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

In Embodiment 12- (2), dedicated reference signals for the first and second layers are multiplexed and arranged in CDM on four resource elements among the dedicated reference signal positions for the first layer of Embodiment 12- (1). . In addition, the dedicated reference signal for the second layer is disposed on four resource elements in addition to the position of the dedicated reference signal of Embodiment 12- (1). Accordingly, within two resource blocks (resource block pairs) consecutive in time of one subframe, a dedicated reference signal for the first layer is disposed on eight resource elements, and the dedicated reference signal for the second layer is assigned to eight resource elements. Is disposed on.

Embodiment 12- (3) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 11- (2) as it is, and additionally dedicated for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third and fourth layers are disposed on four resource elements, respectively, and are arranged on subcarriers concatenated on one OFDM symbol and multiplexed using the FDM scheme. The dedicated reference signals for the fifth to eighth layers are disposed on 4 resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 12- (4) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 12- (2) as it is, and additionally for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third, fifth and seventh layers are disposed on 6 resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the fourth, sixth, and eighth layers are disposed on six resource elements and multiplexed in a CDM manner in one resource element.

Embodiments 12- (5) to 12- (8) shown in FIG. 28 use a dedicated reference signal located on a twelfth OFDM symbol in Embodiments 12- (1) to 12- (4) of FIG. 27. It is a modified example arrange | positioned on an OFDM symbol.

Example  13 (Figures 29 and 30)

(One) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (12,0), (12,9)} (2) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (12,0), (12,9)} B (l, k) = {(5,0), (5,9), (6,6), (9,3), (10,0), (10,9)} (3) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (12,0), (12,9)} B (l, k) = {(5,0), (5,9), (6,6), (9,3), (10,0), (10,9)} C ~ H (l, k) = {(3,3), (3,6), (6,0), (6,9), (9,0), (9,9), (12,3), (12,6)} (4) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (12,0), (12,9)} B (l, k) = {(5,0), (5,9), (6,6), (9,3), (10,0), (10,9)} C ~ E (l, k) = {(3,3), (3,6), (6,0), (6,9)} F to H (l, k) = {(9,0), (9,9), (12,3), (12,6)} (5) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (13,0), (13,9)} (6) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (13,0), (13,9)} B (l, k) = {(5,0), (5,9), (6,6), (9,3), (10,0), (10,9)} (7) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (13,0), (13,9)} B (l, k) = {(5,0), (5,9), (6,6), (9,3), (10,0), (10,9)} C ~ H (l, k) = {(3,3), (3,6), (6,0), (6,9), (9,0), (9,9), (13,3), (13,6)} (8) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (13,0), (13,9)} B (l, k) = {(5,0), (5,9), (6,6), (9,3), (10,0), (10,9)} C ~ E (l, k) = {(3,3), (3,6), (6,0), (6,9)} F to H (l, k) = {(9,0), (9,9), (13,3), (13,6)}

Referring to FIG. 29, in Embodiment 13- (1), a dedicated reference signal for a first layer is disposed at two subcarriers or one subcarrier position on 4 OFDM symbols for rank 1 transmission. The dedicated reference signal for the first layer is disposed on 6 resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

In Embodiment 13- (2), a dedicated reference signal for the second layer is disposed on 6 resource elements in addition to the dedicated reference signal position of Embodiment 13- (1).

Embodiment 13- (3) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 13- (2) as it is, and additionally dedicated for the third to eighth layers. The pattern of the reference signal is defined. The dedicated reference signals for the third to eighth layers are disposed on 8 resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 13- (4) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 13- (2) as it is, and additionally dedicated for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third to fifth layers are arranged on four resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the sixth to eighth layers are disposed on four resource elements and multiplexed in a CDM manner in one resource element.

The thirteenth embodiments 13- (5) to 13- (8) shown in FIG. 30 refer to a thirteenth dedicated reference signal located on a twelfth OFDM symbol in the thirteenth embodiments 13- (1) to 13- (4) of FIG. It is a modified example arrange | positioned on an OFDM symbol.

Example  14 (Figures 31 and 32)

(One) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (12,0), (12,9)} (2) A / B (l, k) = {(3,0), (3,9), (6,3), (9,6), (12,0), (12,9)} (3) A / B (l, k) = {(3,0), (3,9), (6,3), (9,6), (12,0), (12,9)} C (l, k) = {(5,4), (5,10), (10,0), (10,7)} D (l, k) = {(5,5), (5,11), (10,1), (10,8)} E ~ H (l, k) = {(5,0), (5,7), (10,3), (10,10)} (4) A / B (l, k) = {(3,0), (3,9), (6,3), (9,6), (12,0), (12,9)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (10,0), (10,4), (10,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (10,1), (10,5), (10,9)} (5) A / B (l, k) = {(3,0), (3,9), (6,3), (9,6), (12,0), (12,9)} C / D (l, k) = {(5,0), (5,9), (6,6), (9,3), (10,0), (10,9)} E / F (l, k) = {(5,6), (6,0), (9,9), (10,3)} G / H (l, k) = {(5,3), (6,9), (9,0), (10,6)} (6) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (13,0), (13,9)} (7) A / B (l, k) = {(3,0), (3,9), (6,3), (9,6), (13,0), (13,9)} (8) A / B (l, k) = {(3,0), (3,9), (6,3), (9,6), (13,0), (13,9)} C (l, k) = {(5,4), (5,10), (10,0), (10,7)} D (l, k) = {(5,5), (5,11), (10,1), (10,8)} E ~ H (l, k) = {(5,0), (5,7), (10,3), (10,10)} (9) A / B (l, k) = {(3,0), (3,9), (6,3), (9,6), (13,0), (13,9)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (10,0), (10,4), (10,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (10,1), (10,5), (10,9)} 10 A / B (l, k) = {(3,0), (3,9), (6,3), (9,6), (13,0), (13,9)} C / D (l, k) = {(5,0), (5,9), (6,6), (9,3), (10,0), (10,9)} E / F (l, k) = {(5,6), (6,0), (9,9), (10,3)} G / H (l, k) = {(5,3), (6,9), (9,0), (10,6)}

In Embodiment 14- (1), referring to FIG. 31, a dedicated reference signal for a first layer is disposed at two subcarriers or one subcarrier position on 4 OFDM symbols for rank 1 transmission. The dedicated reference signal for the first layer is disposed on 6 resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

In Embodiment 14- (2), dedicated reference signals for the first and second layers are multiplexed and arranged in a CDM scheme at both dedicated reference signal positions of Embodiment 14- (1).

Embodiment 14- (3) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 14- (2) as it is, and additionally dedicated for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third and fourth layers are disposed on four resource elements, respectively, and are arranged on subcarriers concatenated on one OFDM symbol and multiplexed using the FDM scheme. The dedicated reference signals for the fifth to eighth layers are disposed on 4 resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 14- (4) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 14- (2) as it is, and additionally dedicated for the third to eighth layers. The pattern of the reference signal is defined. The dedicated reference signals for the third, fifth and seventh layers are disposed on 6 resource elements and multiplexed in a CDM manner in one resource element. The dedicated reference signals for the fourth, sixth, and eighth layers are disposed on six resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 14- (5) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 14- (2) as it is, and additionally dedicated for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third and fourth layers are disposed on 6 resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the fifth and sixth layers are disposed on four resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the seventh and eighth layers are disposed on four resource elements and multiplexed in a CDM manner in one resource element.

Embodiments 14- (6) to 14- (10) shown in FIG. 32 use a dedicated reference signal located on a twelfth OFDM symbol in Embodiments 14- (1) to 14- (5) of FIG. It is a modified example arrange | positioned on an OFDM symbol.

Example  15 (Figures 33 and 34)

(One) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (12,0), (12,9)} (2) A (l, k) = {(6,3), (9,6)} B (l, k) = {(6,6), (9,3)} A / B (l, k) = {(3,0), (3,9), (12,0), (12,9)} (3) A (l, k) = {(6,3), (9,6)} B (l, k) = {(6,6), (9,3)} A / B (l, k) = {(3,0), (3,9), (12,0), (12,9)} C (l, k) = {(5,4), (5,10), (10,0), (10,7)} D (l, k) = {(5,5), (5,11), (10,1), (10,8)} E ~ H (l, k) = {(5,0), (5,7), (10,3), (10,10)} (4) A (l, k) = {(6,3), (9,6)} B (l, k) = {(6,6), (9,3)} A / B (l, k) = {(3,0), (3,9), (12,0), (12,9)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (10,0), (10,4), (10,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (10,1), (10,5), (10,9)} (5) A (l, k) = {(6,3), (9,6)} B (l, k) = {(6,6), (9,3)} A / B (l, k) = {(3,0), (3,9), (12,0), (12,9)} C / D (l, k) = {(3,3), (3,6), (6,0), (6,9)} E / F (l, k) = {(9,0), (9,9), (12,3), (12,6)} G / H (l, k) = {(10,0), (10,3), (10,6), (10,9)} (6) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (13,0), (13,9)} (7) A (l, k) = {(6,3), (9,6)} B (l, k) = {(6,6), (9,3)} A / B (l, k) = {(3,0), (3,9), (13,0), (13,9)} (8) A (l, k) = {(6,3), (9,6)} B (l, k) = {(6,6), (9,3)} A / B (l, k) = {(3,0), (3,9), (13,0), (13,9)} C (l, k) = {(5,4), (5,10), (10,0), (10,7)} D (l, k) = {(5,5), (5,11), (10,1), (10,8)} E ~ H (l, k) = {(5,0), (5,7), (10,3), (10,10)} (9) A (l, k) = {(6,3), (9,6)} B (l, k) = {(6,6), (9,3)} A / B (l, k) = {(3,0), (3,9), (13,0), (13,9)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (10,0), (10,4), (10,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (10,1), (10,5), (10,9)} 10 A (l, k) = {(6,3), (9,6)} B (l, k) = {(6,6), (9,3)} A / B (l, k) = {(3,0), (3,9), (13,0), (13,9)} C / D (l, k) = {(3,3), (3,6), (6,0), (6,9)} E / F (l, k) = {(9,0), (9,9), (13,3), (13,6)} G / H (l, k) = {(10,0), (10,3), (10,6), (10,9)}

Referring to FIG. 33, in Embodiment 15- (1), a dedicated reference signal for a first layer is disposed at two subcarriers or one subcarrier position on 4 OFDM symbols for rank 1 transmission. The dedicated reference signal for the first layer is disposed on 6 resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

In Embodiment 15- (2), dedicated reference signals for the first and second layers are multiplexed and arranged in CDM on four resource elements among the dedicated reference signal positions of Embodiment 15- (1). Further, in addition to the dedicated reference signal position of 15- (1), a dedicated reference signal for the second layer is disposed on two resource elements.

Embodiment 15- (3) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 15- (2) as they are, and additionally dedicated for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third and fourth layers are disposed on four resource elements, respectively, and are arranged on subcarriers concatenated on one OFDM symbol and multiplexed using the FDM scheme. The dedicated reference signals for the fifth to eighth layers are disposed on 4 resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 15- (4) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 15- (2) as they are, and additionally dedicated to the third to eighth layers. The pattern of the reference signal is defined. The dedicated reference signals for the third, fifth and seventh layers are disposed on 6 resource elements and multiplexed in a CDM manner in one resource element. The dedicated reference signals for the fourth, sixth, and eighth layers are disposed on six resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 15- (5) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 15- (2) as it is, and additionally dedicated for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third and fourth layers are disposed on four resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the fifth and sixth layers are disposed on four resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the seventh and eighth layers are disposed on four resource elements and multiplexed in a CDM manner in one resource element.

Embodiments 15- (6) to 15- (10) shown in FIG. 34 designate a dedicated reference signal located on a twelfth OFDM symbol in Embodiments 15- (1) to 15- (5) of FIG. It is a modified example arrange | positioned on an OFDM symbol.

Example  16 (FIGS. 35 and 36)

(One) A (l, k) = {(3,0), (3,9), (5,0), (5,9), (6,3), (6,6), (9,3), (9,6), ( 10,0), (10,9), (12,0), (12,9)} (2) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (12,0), (12,9)} B (l, k) = {(5,0), (5,9), (6,6), (9,3), (10,0), (10,9)} (3) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (12,0), (12,9)} B (l, k) = {(5,0), (5,9), (6,6), (9,3), (10,0), (10,9)} C ~ H (l, k) = {(3,3), (3,6), (6,0), (6,9), (9,0), (9,9), (12,3), (12,6)} (4) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (12,0), (12,9)} B (l, k) = {(5,0), (5,9), (6,6), (9,3), (10,0), (10,9)} C / D (l, k) = {(3,3), (3,6), (6,0), (6,9)} E / F (l, k) = {(9,0), (9,9), (12,3), (12,6)} G / H (l, k) = {(5,3), (5,6), (10,3), (10,6)} (5) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (12,0), (12,9)} B (l, k) = {(5,0), (5,9), (6,6), (9,3), (10,0), (10,9)} C ~ E (l, k) = {(3,6), (6,9), (9,0), (12,3)} F to H (l, k) = {(3,3), (6,0), (9,9), (12,6)} (6) A (l, k) = {(3,0), (3,9), (5,0), (5,9), (6,3), (6,6), (9,3), (9,6), ( 10,0), (10,9), (13,0), (13,9)} (7) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (13,0), (13,9)} B (l, k) = {(5,0), (5,9), (6,6), (9,3), (10,0), (10,9)} (8) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (13,0), (13,9)} B (l, k) = {(5,0), (5,9), (6,6), (9,3), (10,0), (10,9)} C ~ H (l, k) = {(3,3), (3,6), (6,0), (6,9), (9,0), (9,9), (13,3), (13,6)} (9) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (13,0), (13,9)} B (l, k) = {(5,0), (5,9), (6,6), (9,3), (10,0), (10,9)} C / D (l, k) = {(3,3), (3,6), (6,0), (6,9)} E / F (l, k) = {(9,0), (9,9), (13,3), (13,6)} G / H (l, k) = {(5,3), (5,6), (10,3), (10,6)} 10 A (l, k) = {(3,0), (3,9), (6,3), (9,6), (13,0), (13,9)} B (l, k) = {(5,0), (5,9), (6,6), (9,3), (10,0), (10,9)} C ~ E (l, k) = {(3,6), (6,9), (9,0), (13,3)} F to H (l, k) = {(3,3), (6,0), (9,9), (13,6)}

Referring to FIG. 35, in Embodiment 16- (1), a dedicated reference signal for a first layer is disposed at two subcarrier positions on 6 OFDM symbols for rank 1 transmission. The dedicated reference signal for the first layer is disposed on 12 resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

Embodiment 16- (2) allocates a dedicated reference signal for the second layer to 6 resource elements among the dedicated reference signal positions of Embodiment 16- (1). Accordingly, dedicated reference signals for the first and second layers are arranged in six resource elements, respectively.

Embodiment 16- (3) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 16- (2) as it is, and additionally dedicated for the third to eighth layers. The pattern of the reference signal is defined. The dedicated reference signals for the third to eighth layers are disposed on 8 resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 16- (4) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 16- (2) as it is, and additionally dedicated to the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third and fourth layers are disposed on four resource elements and multiplexed in a CDM manner in one resource element. The dedicated reference signals for the fifth and sixth layers are disposed on 4 resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the seventh and eighth layers are disposed on four resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 16- (5) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 16- (2) as it is, and additionally dedicated to the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third to fifth layers are disposed on four resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the sixth to eighth layers are disposed on four resource elements and multiplexed in the CDM scheme in one resource element.

Embodiments 16- (6) to 16- (10) shown in FIG. 36 designate a dedicated reference signal located on a twelfth OFDM symbol in Embodiments 16- (1) to 16- (5) of FIG. It is a modified example arrange | positioned on an OFDM symbol.

Example  17 (FIGS. 37 and 38)

(One) A (l, k) = ((3,0), (3,9), (5,3), (5,6), (6,0), (6,9), (9,0), (9,9), ( 10,3), (10,6), (12,0), (12,9)} (2) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (12,0), (12,9)} B (l, k) = {(5,0), (5,9), (6,6), (9,3), (10,0), (10,9)} (3) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (12,0), (12,9)} B (l, k) = {(5,0), (5,9), (6,6), (9,3), (10,0), (10,9)} C ~ H (l, k) = {(3,3), (3,6), (6,0), (6,9), (9,0), (9,9), (12,3), (12,6)} (4) A (l, k) = ((3,0), (3,9), (5,3), (5,6), (6,0), (6,9), (9,0), (9,9), ( 10,3), (10,6), (13,0), (13,9)} (5) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (13,0), (13,9)} B (l, k) = {(5,0), (5,9), (6,6), (9,3), (10,0), (10,9)} (6) A (l, k) = {(3,0), (3,9), (6,3), (9,6), (13,0), (13,9)} B (l, k) = {(5,0), (5,9), (6,6), (9,3), (10,0), (10,9)} C ~ H (l, k) = {(3,3), (3,6), (6,0), (6,9), (9,0), (9,9), (13,3), (13,6)}

Referring to FIG. 37, in Embodiment 17- (1), a dedicated reference signal for a first layer is disposed at two subcarrier positions on 6 OFDM symbols for rank 1 transmission. The dedicated reference signal for the first layer is disposed on 12 resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

Embodiment 17- (2) allocates a dedicated reference signal for the second layer to 6 resource elements among the dedicated reference signal positions of Embodiment 17- (1). Accordingly, dedicated reference signals for the first and second layers are arranged in six resource elements, respectively.

Embodiment 17- (3) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 17- (2) as it is, and additionally dedicated for the third to eighth layers. The pattern of the reference signal is defined. The dedicated reference signals for the third to eighth layers are disposed on 8 resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 17- (4) to 17- (6) shown in FIG. 38 uses the 13th dedicated reference signal located on the twelfth OFDM symbol in Embodiment 17- (1) to 17- (3) of FIG. It is a modified example arrange | positioned on an OFDM symbol.

Example  18 (Figures 39 and 40)

(One) A (l, k) = {(3,0), (3,3), (3,6), (3,9), (6,3), (6,6), (9,6), (9,9), ( 12,2), (12,5), (12,8), (12,11)} (2) A (l, k) = {(3,0), (3,6), (6,3), (9,6), (12,2), (12,8)} B (l, k) = {(3,3), (3,9), (6,6), (9,9), (12,5), (12,11)} (3) A (l, k) = {(3,0), (3,6), (6,3), (9,6), (12,2), (12,8)} B (l, k) = {(3,3), (3,9), (6,6), (9,9), (12,5), (12,11)} C (l, k) = {(5,4), (5,10), (10,0), (10,7)} D (l, k) = {(5,5), (5,11), (10,1), (10,8)} E ~ H (l, k) = {(5,0), (5,7), (10,3), (10,10)} (4) A (l, k) = {(3,0), (3,6), (6,3), (9,6), (12,2), (12,8)} B (l, k) = {(3,3), (3,9), (6,6), (9,9), (12,5), (12,11)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (10,0), (10,4), (10,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (10,1), (10,5), (10,9)} (5) A (l, k) = {(3,0), (3,3), (3,6), (3,9), (6,3), (6,6), (9,6), (9,9), ( 13,2), (13,5), (13,8), (13,11)} (6) A (l, k) = {(3,0), (3,6), (6,3), (9,6), (13,2), (13,8)} B (l, k) = {(3,3), (3,9), (6,6), (9,9), (13,5), (13,11)} (7) A (l, k) = {(3,0), (3,6), (6,3), (9,6), (13,2), (13,8)} B (l, k) = {(3,3), (3,9), (6,6), (9,9), (13,5), (13,11)} C (l, k) = {(5,4), (5,10), (10,0), (10,7)} D (l, k) = {(5,5), (5,11), (10,1), (10,8)} E ~ H (l, k) = {(5,0), (5,7), (10,3), (10,10)} (8) A (l, k) = {(3,0), (3,6), (6,3), (9,6), (13,2), (13,8)} B (l, k) = {(3,3), (3,9), (6,6), (9,9), (13,5), (13,11)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (10,0), (10,4), (10,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (10,1), (10,5), (10,9)}

Referring to FIG. 39, in Embodiment 18- (1), a dedicated reference signal for a first layer is disposed at two or four subcarrier positions on four OFDM symbols for rank 1 transmission. The dedicated reference signal for the first layer is disposed on 12 resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

Embodiment 18- (2) allocates a dedicated reference signal for the second layer to 6 resource elements among the dedicated reference signal positions of embodiment 18- (1). Accordingly, dedicated reference signals for the first and second layers are arranged in six resource elements, respectively.

Embodiment 18- (3) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 18- (2) as it is, and additionally dedicated for the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third and fourth layers are disposed on four resource elements, respectively, and are arranged on subcarriers concatenated on one OFDM symbol and multiplexed using the FDM scheme. The dedicated reference signals for the fifth to eighth layers are disposed on 4 resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 18- (4) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 18- (2) as it is, and additionally for the third to eighth layers. The pattern of the reference signal is defined. The dedicated reference signals for the third, fifth and seventh layers are disposed on 6 resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the fourth, sixth, and eighth layers are disposed on six resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 18- (5) to 18- (8) shown in FIG. 40 uses the dedicated reference signal located on the twelfth OFDM symbol in Embodiment 18- (1) to 18- (4) of FIG. It is a modified example arrange | positioned on an OFDM symbol.

Example  19 (FIGS. 41 and 42)

(One) A (l, k) = {(3,0), (3,3), (3,6), (3,9), (6,1), (6,4), (6,7), (6,10), ( 12,0), (12,3), (12,6), (12,9)} (2) A (l, k) = {(3,0), (3,6), (6,4), (6,10), (12,3), (12,9)} B (l, k) = {(3,3), (3,9), (6,1), (6,7), (12,0), (12,6)} (3) A (l, k) = {(3,0), (3,6), (6,4), (6,10), (12,3), (12,9)} B (l, k) = {(3,3), (3,9), (6,1), (6,7), (12,0), (12,6)} C (l, k) = {(5,4), (5,10), (10,0), (10,7)} D (l, k) = {(5,5), (5,11), (10,1), (10,8)} E ~ H (l, k) = {(5,0), (5,7), (10,3), (10,10)} (4) A (l, k) = {(3,0), (3,6), (6,4), (6,10), (12,3), (12,9)} B (l, k) = {(3,3), (3,9), (6,1), (6,7), (12,0), (12,6)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (10,0), (10,4), (10,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (10,1), (10,5), (10,9)} (5) A (l, k) = {(3,0), (3,3), (3,6), (3,9), (6,1), (6,4), (6,7), (6,10), ( 13,0), (13,3), (13,6), (13,9)} (6) A (l, k) = {(3,0), (3,6), (6,4), (6,10), (13,3), (13,9)} B (l, k) = {(3,3), (3,9), (6,1), (6,7), (13,0), (13,6)} (7) A (l, k) = {(3,0), (3,6), (6,4), (6,10), (13,3), (13,9)} B (l, k) = {(3,3), (3,9), (6,1), (6,7), (13,0), (13,6)} C (l, k) = {(5,4), (5,10), (10,0), (10,7)} D (l, k) = {(5,5), (5,11), (10,1), (10,8)} E ~ H (l, k) = {(5,0), (5,7), (10,3), (10,10)} (8) A (l, k) = {(3,0), (3,6), (6,4), (6,10), (13,3), (13,9)} B (l, k) = {(3,3), (3,9), (6,1), (6,7), (13,0), (13,6)} C / E / G (l, k) = {(5,2), (5,6), (5,10), (10,0), (10,4), (10,8)} D / F / H (l, k) = {(5,3), (5,7), (5,11), (10,1), (10,5), (10,9)}

Referring to FIG. 41, in Embodiment 19- (1), a dedicated reference signal for a first layer is disposed at four subcarrier positions on three OFDM symbols for rank 1 transmission. The dedicated reference signal for the first layer is disposed on 12 resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

Embodiment 19- (2) allocates a dedicated reference signal for the second layer to 6 resource elements among the dedicated reference signal positions of Embodiment 19- (1). Accordingly, dedicated reference signals for the first and second layers are arranged in six resource elements, respectively.

Embodiment 19- (3) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 19- (2) as it is, and additionally dedicated to the third to eighth layers. The pattern of the reference signal is defined. Dedicated reference signals for the third and fourth layers are disposed on four resource elements, respectively, and are arranged on subcarriers concatenated on one OFDM symbol and multiplexed using the FDM scheme. The dedicated reference signals for the fifth to eighth layers are disposed on 4 resource elements and multiplexed in a CDM manner in one resource element.

Embodiment 19- (4) is for rank 8 transmission, using the dedicated reference signal patterns for the first and second layers of embodiment 19- (2) as it is, and additionally dedicated for the third to eighth layers. The pattern of the reference signal is defined. The dedicated reference signals for the third, fifth and seventh layers are disposed on 6 resource elements and multiplexed in a CDM manner in one resource element. Dedicated reference signals for the fourth, sixth, and eighth layers are disposed on six resource elements and multiplexed in a CDM manner in one resource element.

Embodiments 19- (5) to 19- (8) shown in FIG. 42 designate a dedicated reference signal located on a twelfth OFDM symbol in embodiments 19- (1) to 19- (4) of FIG. 41. It is a modified example arrange | positioned on an OFDM symbol.

Example  20 (Figures 43 and 44)

(One) A (l, k) = {(3,1), (3,7), (10,1), (10,7), (12,1), (12,7)} B (l, k) = {(3,4), (3,10), (10,4), (10,10), (12,4), (12,10)} C (l, k) = {(5,1), (5,7), (9,1), (9,7)} D (l, k) = {(6,4), (6,10), (9,4), (9,10)} E ~ H (l, k) = {(5,4), (5,10), (6,1), (6,7)} (2) A (l, k) = {(3,0), (3,6), (10,0), (10,6), (12,0), (12,6)} B (l, k) = {(3,3), (3,9), (10,3), (10,9), (12,3), (12,9)} C (l, k) = {(5,0), (5,6), (9,0), (9,6)} D (l, k) = {(6,3), (6,9), (9,3), (9,9)} E ~ H (l, k) = {(5,3), (5,9), (6,0), (6,6)} (3) A (l, k) = {(3,2), (3,8), (10,2), (10,8), (12,2), (12,8)} B (l, k) = {(3,5), (3,11), (10,5), (10,11), (12,5), (12,11)} C (l, k) = {(5,2), (5,8), (9,2), (9,8)} D (l, k) = {(6,5), (6,11), (9,5), (9,11)} E ~ H (l, k) = {(5,5), (5,11), (6,2), (6,8)} (4) A (l, k) = {(3,1), (3,7), (10,1), (10,7), (12,1), (12,7)} B (l, k) = {(3,4), (3,10), (10,4), (10,10), (12,4), (12,10)} C (l, k) = {(9,0), (9,3), (9,6), (9,9)} D (l, k) = {(9,1), (9,4), (9,7), (9,10)} E ~ H (l, k) = {(9,2), (9,5), (9,8), (9,11)} (5) A (l, k) = {(3,0), (3,6), (10,1), (10,7), (12,2), (12,8)} B (l, k) = {(3,3), (3,9), (10,4), (10,10), (12,5), (12,11)} C (l, k) = {(5,0), (5,6), (9,2), (9,8)} D (l, k) = {(6,4), (6,10), (9,5), (9,11)} E ~ H (l, k) = {(5,3), (5,9), (6,1), (6,7)} (6) A (l, k) = {(3,2), (3,8), (10,1), (10,7), (12,0), (12,6)} B (l, k) = {(3,5), (3,11), (10,4), (10,10), (12,3), (12,9)} C (l, k) = {(5,2), (5,8), (9,0), (9,6)} D (l, k) = {(6,4), (6,10), (9,3), (9,9)} E ~ H (l, k) = {(5,5), (5,11), (6,1), (6,7)} (7) A (l, k) = {(3,0), (3,6), (10,0), (10,6), (12,0), (12,6)} B (l, k) = {(3,1), (3,7), (10,1), (10,7), (12,1), (12,7)} C (l, k) = {(5,0), (5,6), (9,0), (9,6)} D (l, k) = {(6,1), (6,7), (9,1), (9,7)} E ~ H (l, k) = {(5,1), (5,7), (6,0), (6,6)} (8) A (l, k) = {(3,1), (3,7), (10,2), (10,8), (12,3), (12,9)} B (l, k) = {(3,2), (3,8), (10,3), (10,9), (12,4), (12,10)} C (l, k) = {(5,1), (5,7), (9,3), (9,9)} D (l, k) = {(6,3), (6,9), (9,4), (9,10)} E ~ H (l, k) = {(5,2), (5,8), (6,2), (6,8)} (9) A (l, k) = {(3,2), (3,8), (10,3), (10,9), (12,4), (12,10)} B (l, k) = {(3,3), (3,9), (10,4), (10,10), (12,5), (12,11)} C (l, k) = {(5,2), (5,8), (9,4), (9,10)} D (l, k) = {(6,4), (6,10), (9,5), (9,11)} E ~ H (l, k) = {(5,3), (5,9), (6,3), (6,9)} 10 A (l, k) = {(3,2), (3,8), (10,2), (10,8), (12,2), (12,8)} B (l, k) = {(3,3), (3,9), (10,3), (10,9), (12,3), (12,9)} C (l, k) = {(5,2), (5,8), (9,2), (9,8)} D (l, k) = {(6,3), (6,9), (9,3), (9,9)} E ~ H (l, k) = {(5,3), (5,9), (6,2), (6,8)} (11) A (l, k) = {(3,0), (3,6), (10,2), (10,8), (12,4), (12,10)} B (l, k) = {(3,1), (3,7), (10,3), (10,9), (12,5), (12,11)} C (l, k) = {(5,0), (5,6), (9,4), (9,10)} D (l, k) = {(6,3), (6,9), (9,5), (9,11)} E ~ H (l, k) = {(5,1), (5,7), (6,2), (6,8)} (12) A (l, k) = {(3,1), (3,7), (10,1), (10,7), (12,1), (12,7)} B (l, k) = {(3,4), (3,10), (10,4), (10,10), (12,4), (12,10)} C (l, k) = {(3,2), (3,8), (10,2), (10,8)} D (l, k) = {(3,5), (3,11), (10,5), (10,11)} E ~ H (l, k) = {(12,2), (12,5), (12,8), (12,11)} (13) A (l, k) = {(3,0), (3,6), (10,0), (10,6), (12,0), (12,6)} B (l, k) = {(3,1), (3,7), (10,1), (10,7), (12,1), (12,7)} C (l, k) = {(3,2), (3,8), (10,2), (10,8)} D (l, k) = {(3,3), (3,9), (10,3), (10,9)} E ~ H (l, k) = {(12,2), (12,3), (12,8), (12,9)}

Embodiments 20- (1) to 20- (13) define patterns in which dedicated reference signals for first to eighth layers for rank 8 transmission are arranged with reference to FIGS. 43 and 44.

Dedicated reference signals for the first and second layers are disposed on the third, tenth, and twelfth OFDM symbols, and dedicated reference signals for the first and second layers are intersected at regular subcarrier intervals in each OFDM symbol. do. Accordingly, the dedicated reference signals for the first and second layers are arranged on 12 resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

Dedicated reference signals for the third and fourth layers may be disposed on four resource elements, respectively, and intersect at regular subcarrier intervals on the same OFDM symbol, or may be disposed on different OFDM symbols. Accordingly, the dedicated reference signals for the third and fourth layers are arranged on eight resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

Dedicated reference signals for the fifth to eighth layers are disposed on four resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe, and multiplexed in a CDM manner on one resource element.

Example  21 (FIGS. 45 and 46)

(One) A (l, k) = {(3,1), (3,7), (10,1), (10,7), (13,1), (13,7)} B (l, k) = {(3,4), (3,10), (10,4), (10,10), (13,4), (13,10)} C (l, k) = {(5,1), (5,7), (9,1), (9,7)} D (l, k) = {(6,4), (6,10), (9,4), (9,10)} E ~ H (l, k) = {(5,4), (5,10), (6,1), (6,7)} (2) A (l, k) = {(3,0), (3,6), (10,0), (10,6), (13,0), (13,6)} B (l, k) = {(3,3), (3,9), (10,3), (10,9), (13,3), (13,9)} C (l, k) = {(5,0), (5,6), (9,0), (9,6)} D (l, k) = {(6,3), (6,9), (9,3), (9,9)} E ~ H (l, k) = {(5,3), (5,9), (6,0), (6,6)} (3) A (l, k) = {(3,2), (3,8), (10,2), (10,8), (13,2), (13,8)} B (l, k) = {(3,5), (3,11), (10,5), (10,11), (13,5), (13,11)} C (l, k) = {(5,2), (5,8), (9,2), (9,8)} D (l, k) = {(6,5), (6,11), (9,5), (9,11)} E ~ H (l, k) = {(5,5), (5,11), (6,2), (6,8)} (4) A (l, k) = {(3,1), (3,7), (10,1), (10,7), (13,1), (13,7)} B (l, k) = {(3,4), (3,10), (10,4), (10,10), (13,4), (13,10)} C (l, k) = {(9,0), (9,3), (9,6), (9,9)} D (l, k) = {(9,1), (9,4), (9,7), (9,10)} E ~ H (l, k) = {(9,2), (9,5), (9,8), (9,11)} (5) A (l, k) = {(3,0), (3,6), (10,1), (10,7), (13,2), (13,8)} B (l, k) = {(3,3), (3,9), (10,4), (10,10), (13,5), (13,11)} C (l, k) = {(5,0), (5,6), (9,2), (9,8)} D (l, k) = {(6,4), (6,10), (9,5), (9,11)} E ~ H (l, k) = {(5,3), (5,9), (6,1), (6,7)} (6) A (l, k) = {(3,2), (3,8), (10,1), (10,7), (13,0), (13,6)} B (l, k) = {(3,5), (3,11), (10,4), (10,10), (13,3), (13,9)} C (l, k) = {(5,2), (5,8), (9,0), (9,6)} D (l, k) = {(6,4), (6,10), (9,3), (9,9)} E ~ H (l, k) = {(5,5), (5,11), (6,1), (6,7)} (7) A (l, k) = {(3,0), (3,6), (10,0), (10,6), (13,0), (13,6)} B (l, k) = {(3,1), (3,7), (10,1), (10,7), (13,1), (13,7)} C (l, k) = {(5,0), (5,6), (9,0), (9,6)} D (l, k) = {(6,1), (6,7), (9,1), (9,7)} E ~ H (l, k) = {(5,1), (5,7), (6,0), (6,6)} (8) A (l, k) = {(3,1), (3,7), (10,2), (10,8), (13,3), (13,9)} B (l, k) = {(3,2), (3,8), (10,3), (10,9), (13,4), (13,10)} C (l, k) = {(5,1), (5,7), (9,3), (9,9)} D (l, k) = {(6,3), (6,9), (9,4), (9,10)} E ~ H (l, k) = {(5,2), (5,8), (6,2), (6,8)} (9) A (l, k) = {(3,2), (3,8), (10,3), (10,9), (13,4), (13,10)} B (l, k) = {(3,3), (3,9), (10,4), (10,10), (13,5), (13,11)} C (l, k) = {(5,2), (5,8), (9,4), (9,10)} D (l, k) = {(6,4), (6,10), (9,5), (9,11)} E ~ H (l, k) = {(5,3), (5,9), (6,3), (6,9)} 10 A (l, k) = {(3,2), (3,8), (10,2), (10,8), (13,2), (13,8)} B (l, k) = {(3,3), (3,9), (10,3), (10,9), (13,3), (13,9)} C (l, k) = {(5,2), (5,8), (9,2), (9,8)} D (l, k) = {(6,3), (6,9), (9,3), (9,9)} E ~ H (l, k) = {(5,3), (5,9), (6,2), (6,8)} (11) A (l, k) = {(3,0), (3,6), (10,2), (10,8), (13,4), (13,10)} B (l, k) = {(3,1), (3,7), (10,3), (10,9), (13,5), (13,11)} C (l, k) = {(5,0), (5,6), (9,4), (9,10)} D (l, k) = {(6,3), (6,9), (9,5), (9,11)} E ~ H (l, k) = {(5,1), (5,7), (6,2), (6,8)} (12) A (l, k) = {(3,1), (3,7), (10,1), (10,7), (13,1), (13,7)} B (l, k) = {(3,4), (3,10), (10,4), (10,10), (13,4), (13,10)} C (l, k) = {(3,2), (3,8), (10,2), (10,8)} D (l, k) = {(3,5), (3,11), (10,5), (10,11)} E ~ H (l, k) = {(13,2), (13,5), (13,8), (13,11)} (13) A (l, k) = {(3,0), (3,6), (10,0), (10,6), (13,0), (13,6)} B (l, k) = {(3,1), (3,7), (10,1), (10,7), (13,1), (13,7)} C (l, k) = {(3,2), (3,8), (10,2), (10,8)} D (l, k) = {(3,3), (3,9), (10,3), (10,9)} E ~ H (l, k) = {(13,2), (13,3), (13,8), (13,9)}

Embodiments 21- (1) through 21- (13) shown in Figs. 45 and 46 are dedicated references located on the twelfth OFDM symbol in Embodiments 20- (1) through 20- (13) of Figs. 43 and 44; This is a modification in which a signal is arranged on a thirteenth OFDM symbol.

Example  22 (FIGS. 47-50)

(One) A (l, k) = {(3,1), (3,7), (8,1), (8,7), (12,1), (12,7)} B (l, k) = {(3,4), (3,10), (8,4), (8,10), (12,4), (12,10)} C (l, k) = {(5,1), (6,1), (9,1), (10,1)} D (l, k) = {(5,9), (6,9), (9,9), (10,9)} E ~ H (l, k) = {(5,5), (6,5), (9,5), (10,5)} (2) A (l, k) = {(3,0), (3,6), (8,0), (8,6), (12,0), (12,6)} B (l, k) = {(3,3), (3,9), (8,3), (8,9), (12,3), (12,9)} C (l, k) = {(5,0), (6,0), (9,0), (10,0)} D (l, k) = {(5,8), (6,8), (9,8), (10,8)} E ~ H (l, k) = {(5,4), (6,4), (9,4), (10,4)} (3) A (l, k) = {(3,2), (3,8), (8,2), (8,8), (12,2), (12,8)} B (l, k) = {(3,5), (3,11), (8,5), (8,11), (12,5), (12,11)} C (l, k) = {(5,2), (6,2), (9,2), (10,2)} D (l, k) = {(5,10), (6,10), (9,10), (10,10)} E ~ H (l, k) = {(5,6), (6,6), (9,6), (10,6)} (4) A (l, k) = {(3,1), (3,7), (8,1), (8,7), (12,1), (12,7)} B (l, k) = {(3,4), (3,10), (8,4), (8,10), (12,4), (12,10)} C (l, k) = {(10,0), (10,3), (10,6), (10,9)} D (l, k) = {(10,1), (10,4), (10,7), (10,10)} E ~ H (l, k) = {(10,2), (10,5), (10,8), (10,11)} (5) A (l, k) = {(3,0), (3,6), (8,1), (8,7), (12,2), (12,8)} B (l, k) = {(3,3), (3,9), (8,4), (8,10), (12,5), (12,11)} C (l, k) = {(5,0), (6,1), (9,2), (10,3)} D (l, k) = {(5,8), (6,9), (9,10), (10,11)} E ~ H (l, k) = {(5,4), (6,5), (9,6), (10,7)} (6) A (l, k) = {(3,2), (3,8), (8,1), (8,7), (12,0), (12,6)} B (l, k) = {(3,5), (3,11), (8,4), (8,10), (12,3), (12,9)} C (l, k) = {(5,3), (6,2), (9,1), (10,0)} D (l, k) = {(5,11), (6,10), (9,9), (10,8)} E ~ H (l, k) = {(5,7), (6,6), (9,5), (10,4)} (7) A (l, k) = {(3,0), (3,6), (8,0), (8,6), (12,0), (12,6)} B (l, k) = {(3,1), (3,7), (8,1), (8,7), (12,1), (12,7)} C (l, k) = {(5,0), (6,0), (9,0), (10,0)} D (l, k) = {(5,1), (6,1), (9,1), (10,1)} E ~ H (l, k) = {(5,6), (6,6), (9,6), (10,6)} (8) A (l, k) = {(3,1), (3,7), (8,2), (8,8), (12,3), (12,9)} B (l, k) = {(3,2), (3,8), (8,3), (8,9), (12,4), (12,10)} C (l, k) = {(5,1), (6,2), (9,3), (10,4)} D (l, k) = {(5,2), (6,3), (9,4), (10,5)} E ~ H (l, k) = {(5,7), (6,8), (9,9), (10,10)} (9) A (l, k) = {(3,2), (3,8), (8,3), (8,9), (12,4), (12,10)} B (l, k) = {(3,3), (3,9), (8,4), (8,10), (12,5), (12,11)} C (l, k) = {(5,2), (6,3), (9,4), (10,5)} D (l, k) = {(5,3), (6,4), (9,5), (10,6)} E ~ H (l, k) = {(5,8), (6,9), (9,10), (10,11)} 10 A (l, k) = {(3,0), (3,6), (8,0), (8,6), (12,0), (12,6)} B (l, k) = {(3,1), (3,7), (8,1), (8,7), (12,1), (12,7)} C (l, k) = {(10,0), (10,3), (10,6), (10,9)} D (l, k) = {(10,1), (10,4), (10,7), (10,10)} E ~ H (l, k) = {(10,2), (10,5), (10,8), (10,11)} (11) A (l, k) = {(3,2), (3,8), (8,2), (8,8), (12,2), (12,8)} B (l, k) = {(3,3), (3,9), (8,3), (8,9), (12,3), (12,9)} C (l, k) = {(5,2), (6,2), (9,2), (10,2)} D (l, k) = {(5,3), (6,3), (9,3), (10,3)} E ~ H (l, k) = {(5,8), (6,8), (9,8), (10,8)} (12) A (l, k) = {(3,0), (3,6), (8,2), (8,8), (12,4), (12,10)} B (l, k) = {(3,1), (3,7), (8,3), (8,9), (12,5), (12,11)} C (l, k) = {(5,0), (6,1), (9,2), (10,3)} D (l, k) = {(5,1), (6,2), (9,3), (10,4)} E ~ H (l, k) = {(5,6), (6,7), (9,8), (10,9)} (13) A (l, k) = {(3,1), (3,7), (8,1), (8,7), (12,1), (12,7)} B (l, k) = {(3,4), (3,10), (8,4), (8,10), (12,4), (12,10)} C (l, k) = {(5,1), (5,7), (10,1), (10,7)} D (l, k) = {(6,4), (6,10), (10,4), (10,10)} E ~ H (l, k) = {(5,4), (5,10), (6,1), (6,7)} (14) A (l, k) = {(3,0), (3,6), (8,0), (8,6), (12,0), (12,6)} B (l, k) = {(3,3), (3,9), (8,3), (8,9), (12,3), (12,9)} C (l, k) = {(5,0), (5,6), (10,0), (10,6)} D (l, k) = {(6,3), (6,9), (10,3), (10,9)} E ~ H (l, k) = {(5,3), (5,9), (6,0), (6,6)} (15) A (l, k) = {(3,2), (3,8), (8,2), (8,8), (12,2), (12,8)} B (l, k) = {(3,5), (3,11), (8,5), (8,11), (12,5), (12,11)} C (l, k) = {(5,2), (5,8), (10,2), (10,8)} D (l, k) = {(6,5), (6,11), (10,5), (10,11)} E ~ H (l, k) = {(5,5), (5,11), (6,2), (6,8)} (16) A (l, k) = {(3,0), (3,6), (8,1), (8,7), (12,2), (12,8)} B (l, k) = {(3,3), (3,9), (8,4), (8,10), (12,5), (12,11)} C (l, k) = {(5,0), (5,6), (10,2), (10,8)} D (l, k) = {(6,4), (6,10), (10,5), (10,11)} E ~ H (l, k) = {(5,3), (5,9), (6,1), (6,7)} (17) A (l, k) = {(3,2), (3,8), (8,1), (8,7), (12,0), (12,6)} B (l, k) = {(3,5), (3,11), (8,4), (8,10), (12,3), (12,9)} C (l, k) = {(5,2), (5,8), (10,0), (10,6)} D (l, k) = {(6,4), (6,10), (10,3), (10,9)} E ~ H (l, k) = {(5,5), (5,11), (6,1), (6,7)} (18) A (l, k) = {(3,0), (3,6), (8,0), (8,6), (12,0), (12,6)} B (l, k) = {(3,1), (3,7), (8,1), (8,7), (12,1), (12,7)} C (l, k) = {(5,0), (5,6), (10,0), (10,6)} D (l, k) = {(6,1), (6,7), (10,1), (10,7)} E ~ H (l, k) = {(5,1), (5,7), (6,0), (6,6)} (19) A (l, k) = {(3,1), (3,7), (8,2), (8,8), (12,3), (12,9)} B (l, k) = {(3,2), (3,8), (8,3), (8,9), (12,4), (12,10)} C (l, k) = {(5,1), (5,7), (10,3), (10,9)} D (l, k) = {(6,3), (6,9), (10,4), (10,10)} E ~ H (l, k) = {(5,2), (5,8), (6,2), (6,8)} (20) A (l, k) = {(3,2), (3,8), (8,3), (8,9), (12,4), (12,10)} B (l, k) = {(3,3), (3,9), (8,4), (8,10), (12,5), (12,11)} C (l, k) = {(5,2), (5,8), (10,4), (10,10)} D (l, k) = {(6,4), (6,10), (10,5), (10,11)} E ~ H (l, k) = {(5,3), (5,9), (6,3), (6,9)} (21) A (l, k) = {(3,2), (3,8), (8,2), (8,8), (12,2), (12,8)} B (l, k) = {(3,3), (3,9), (8,3), (8,9), (12,3), (12,9)} C (l, k) = {(5,2), (5,8), (10,2), (10,8)} D (l, k) = {(6,3), (6,9), (10,3), (10,9)} E ~ H (l, k) = {(5,3), (5,9), (6,2), (6,8)} (22) A (l, k) = {(3,0), (3,6), (8,2), (8,8), (12,4), (12,10)} B (l, k) = {(3,1), (3,7), (8,3), (8,9), (12,5), (12,11)} C (l, k) = {(5,0), (5,6), (10,4), (10,10)} D (l, k) = {(6,3), (6,9), (10,5), (10,11)} E ~ H (l, k) = {(5,1), (5,7), (6,2), (6,8)} (23) A (l, k) = {(3,1), (3,7), (8,1), (8,7), (12,1), (12,7)} B (l, k) = {(3,4), (3,10), (8,4), (8,10), (12,4), (12,10)} C (l, k) = {(3,2), (3,8), (12,2), (12,8)} D (l, k) = {(3,5), (3,11), (12,5), (12,11)} E ~ H (l, k) = {(8,2), (8,5), (8,8), (8,11)} (24) A (l, k) = {(3,0), (3,6), (8,0), (8,6), (12,0), (12,6)} B (l, k) = {(3,1), (3,7), (8,1), (8,7), (12,1), (12,7)} C (l, k) = {(3,2), (3,8), (12,2), (12,8)} D (l, k) = {(3,3), (3,9), (12,3), (12,9)} E ~ H (l, k) = {(8,2), (8,3), (8,8), (8,9)}

47 to 50, embodiments 20- (1) to 20- (13) define a pattern in which a dedicated reference signal for the first to eighth layers is arranged for rank 8 transmission.

Dedicated reference signals for the first and second layers are disposed on the third, eighth, and twelfth OFDM symbols, and dedicated reference signals for the first and second layers are alternately arranged at a constant subcarrier interval in each OFDM symbol. do. Accordingly, the dedicated reference signals for the first and second layers are arranged on 12 resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

Dedicated reference signals for the third and fourth layers may be disposed on four resource elements, respectively, and intersect at regular subcarrier intervals on the same OFDM symbol, or may be disposed on different OFDM symbols. Accordingly, the dedicated reference signals for the third and fourth layers are arranged on eight resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe.

Dedicated reference signals for the fifth to eighth layers are disposed on four resource elements in two consecutive resource blocks (resource block pairs) in time of one subframe, and multiplexed in a CDM manner on one resource element.

Example  23 (FIGS. 51-54)

(One) A (l, k) = {(3,1), (3,7), (8,1), (8,7), (13,1), (13,7)} B (l, k) = {(3,4), (3,10), (8,4), (8,10), (13,4), (13,10)} C (l, k) = {(5,1), (6,1), (9,1), (10,1)} D (l, k) = {(5,9), (6,9), (9,9), (10,9)} E ~ H (l, k) = {(5,5), (6,5), (9,5), (10,5)} (2) A (l, k) = {(3,0), (3,6), (8,0), (8,6), (13,0), (13,6)} B (l, k) = {(3,3), (3,9), (8,3), (8,9), (13,3), (13,9)} C (l, k) = {(5,0), (6,0), (9,0), (10,0)} D (l, k) = {(5,8), (6,8), (9,8), (10,8)} E ~ H (l, k) = {(5,4), (6,4), (9,4), (10,4)} (3) A (l, k) = {(3,2), (3,8), (8,2), (8,8), (13,2), (13,8)} B (l, k) = {(3,5), (3,11), (8,5), (8,11), (13,5), (13,11)} C (l, k) = {(5,2), (6,2), (9,2), (10,2)} D (l, k) = {(5,10), (6,10), (9,10), (10,10)} E ~ H (l, k) = {(5,6), (6,6), (9,6), (10,6)} (4) A (l, k) = {(3,1), (3,7), (8,1), (8,7), (13,1), (13,7)} B (l, k) = {(3,4), (3,10), (8,4), (8,10), (13,4), (13,10)} C (l, k) = {(10,0), (10,3), (10,6), (10,9)} D (l, k) = {(10,1), (10,4), (10,7), (10,10)} E ~ H (l, k) = {(10,2), (10,5), (10,8), (10,11)} (5) A (l, k) = {(3,0), (3,6), (8,1), (8,7), (13,2), (13,8)} B (l, k) = {(3,3), (3,9), (8,4), (8,10), (13,5), (13,11)} C (l, k) = {(5,0), (6,1), (9,2), (10,3)} D (l, k) = {(5,8), (6,9), (9,10), (10,11)} E ~ H (l, k) = {(5,4), (6,5), (9,6), (10,7)} (6) A (l, k) = {(3,2), (3,8), (8,1), (8,7), (13,0), (13,6)} B (l, k) = {(3,5), (3,11), (8,4), (8,10), (13,3), (13,9)} C (l, k) = {(5,3), (6,2), (9,1), (10,0)} D (l, k) = {(5,11), (6,10), (9,9), (10,8)} E ~ H (l, k) = {(5,7), (6,6), (9,5), (10,4)} (7) A (l, k) = {(3,0), (3,6), (8,0), (8,6), (13,0), (13,6)} B (l, k) = {(3,1), (3,7), (8,1), (8,7), (13,1), (13,7)} C (l, k) = {(5,0), (6,0), (9,0), (10,0)} D (l, k) = {(5,1), (6,1), (9,1), (10,1)} E ~ H (l, k) = {(5,6), (6,6), (9,6), (10,6)} (8) A (l, k) = {(3,1), (3,7), (8,2), (8,8), (13,3), (13,9)} B (l, k) = {(3,2), (3,8), (8,3), (8,9), (13,4), (13,10)} C (l, k) = {(5,1), (6,2), (9,3), (10,4)} D (l, k) = {(5,2), (6,3), (9,4), (10,5)} E ~ H (l, k) = {(5,7), (6,8), (9,9), (10,10)} (9) A (l, k) = {(3,2), (3,8), (8,3), (8,9), (13,4), (13,10)} B (l, k) = {(3,3), (3,9), (8,4), (8,10), (13,5), (13,11)} C (l, k) = {(5,2), (6,3), (9,4), (10,5)} D (l, k) = {(5,3), (6,4), (9,5), (10,6)} E ~ H (l, k) = {(5,8), (6,9), (9,10), (10,11)} 10 A (l, k) = {(3,0), (3,6), (8,0), (8,6), (13,0), (13,6)} B (l, k) = {(3,1), (3,7), (8,1), (8,7), (13,1), (13,7)} C (l, k) = {(10,0), (10,3), (10,6), (10,9)} D (l, k) = {(10,1), (10,4), (10,7), (10,10)} E ~ H (l, k) = {(10,2), (10,5), (10,8), (10,11)} (11) A (l, k) = {(3,2), (3,8), (8,2), (8,8), (13,2), (13,8)} B (l, k) = {(3,3), (3,9), (8,3), (8,9), (13,3), (13,9)} C (l, k) = {(5,2), (6,2), (9,2), (10,2)} D (l, k) = {(5,3), (6,3), (9,3), (10,3)} E ~ H (l, k) = {(5,8), (6,8), (9,8), (10,8)} (12) A (l, k) = {(3,0), (3,6), (8,2), (8,8), (13,4), (13,10)} B (l, k) = {(3,1), (3,7), (8,3), (8,9), (13,5), (13,11)} C (l, k) = {(5,0), (6,1), (9,2), (10,3)} D (l, k) = {(5,1), (6,2), (9,3), (10,4)} E ~ H (l, k) = {(5,6), (6,7), (9,8), (10,9)} (13) A (l, k) = {(3,1), (3,7), (8,1), (8,7), (13,1), (13,7)} B (l, k) = {(3,4), (3,10), (8,4), (8,10), (13,4), (13,10)} C (l, k) = {(5,1), (5,7), (10,1), (10,7)} D (l, k) = {(6,4), (6,10), (10,4), (10,10)} E ~ H (l, k) = {(5,4), (5,10), (6,1), (6,7)} (14) A (l, k) = {(3,0), (3,6), (8,0), (8,6), (13,0), (13,6)} B (l, k) = {(3,3), (3,9), (8,3), (8,9), (13,3), (13,9)} C (l, k) = {(5,0), (5,6), (10,0), (10,6)} D (l, k) = {(6,3), (6,9), (10,3), (10,9)} E ~ H (l, k) = {(5,3), (5,9), (6,0), (6,6)} (15) A (l, k) = {(3,2), (3,8), (8,2), (8,8), (13,2), (13,8)} B (l, k) = {(3,5), (3,11), (8,5), (8,11), (13,5), (13,11)} C (l, k) = {(5,2), (5,8), (10,2), (10,8)} D (l, k) = {(6,5), (6,11), (10,5), (10,11)} E ~ H (l, k) = {(5,5), (5,11), (6,2), (6,8)} (16) A (l, k) = {(3,0), (3,6), (8,1), (8,7), (13,2), (13,8)} B (l, k) = {(3,3), (3,9), (8,4), (8,10), (13,5), (13,11)} C (l, k) = {(5,0), (5,6), (10,2), (10,8)} D (l, k) = {(6,4), (6,10), (10,5), (10,11)} E ~ H (l, k) = {(5,3), (5,9), (6,1), (6,7)} (17) A (l, k) = {(3,2), (3,8), (8,1), (8,7), (13,0), (13,6)} B (l, k) = {(3,5), (3,11), (8,4), (8,10), (13,3), (13,9)} C (l, k) = {(5,2), (5,8), (10,0), (10,6)} D (l, k) = {(6,4), (6,10), (10,3), (10,9)} E ~ H (l, k) = {(5,5), (5,11), (6,1), (6,7)} (18) A (l, k) = {(3,0), (3,6), (8,0), (8,6), (13,0), (13,6)} B (l, k) = {(3,1), (3,7), (8,1), (8,7), (13,1), (13,7)} C (l, k) = {(5,0), (5,6), (10,0), (10,6)} D (l, k) = {(6,1), (6,7), (10,1), (10,7)} E ~ H (l, k) = {(5,1), (5,7), (6,0), (6,6)} (19) A (l, k) = {(3,1), (3,7), (8,2), (8,8), (13,3), (13,9)} B (l, k) = {(3,2), (3,8), (8,3), (8,9), (13,4), (13,10)} C (l, k) = {(5,1), (5,7), (10,3), (10,9)} D (l, k) = {(6,3), (6,9), (10,4), (10,10)} E ~ H (l, k) = {(5,2), (5,8), (6,2), (6,8)} (20) A (l, k) = {(3,2), (3,8), (8,3), (8,9), (13,4), (13,10)} B (l, k) = {(3,3), (3,9), (8,4), (8,10), (13,5), (13,11)} C (l, k) = {(5,2), (5,8), (10,4), (10,10)} D (l, k) = {(6,4), (6,10), (10,5), (10,11)} E ~ H (l, k) = {(5,3), (5,9), (6,3), (6,9)} (21) A (l, k) = {(3,2), (3,8), (8,2), (8,8), (13,2), (13,8)} B (l, k) = {(3,3), (3,9), (8,3), (8,9), (13,3), (13,9)} C (l, k) = {(5,2), (5,8), (10,2), (10,8)} D (l, k) = {(6,3), (6,9), (10,3), (10,9)} E ~ H (l, k) = {(5,3), (5,9), (6,2), (6,8)} (22) A (l, k) = {(3,0), (3,6), (8,2), (8,8), (13,4), (13,10)} B (l, k) = {(3,1), (3,7), (8,3), (8,9), (13,5), (13,11)} C (l, k) = {(5,0), (5,6), (10,4), (10,10)} D (l, k) = {(6,3), (6,9), (10,5), (10,11)} E ~ H (l, k) = {(5,1), (5,7), (6,2), (6,8)} (23) A (l, k) = {(3,1), (3,7), (8,1), (8,7), (13,1), (13,7)} B (l, k) = {(3,4), (3,10), (8,4), (8,10), (13,4), (13,10)} C (l, k) = {(3,2), (3,8), (13,2), (13,8)} D (l, k) = {(3,5), (3,11), (13,5), (13,11)} E ~ H (l, k) = {(8,2), (8,5), (8,8), (8,11)} (24) A (l, k) = {(3,0), (3,6), (8,0), (8,6), (13,0), (13,6)} B (l, k) = {(3,1), (3,7), (8,1), (8,7), (13,1), (13,7)} C (l, k) = {(3,2), (3,8), (13,2), (13,8)} D (l, k) = {(3,3), (3,9), (13,3), (13,9)} E ~ H (l, k) = {(8,2), (8,3), (8,8), (8,9)}

Embodiments 23- (1) to 23- (24) shown in Figs. 51 to 54 are dedicated references located on the twelfth OFDM symbol in Embodiments 22- (1) to 22- (24) of Figs. 47 to 50; This is a modification in which a signal is arranged on a thirteenth OFDM symbol.

55 is a diagram showing the configuration of a preferred embodiment of a wireless communication system including a terminal apparatus and a base station apparatus according to the present invention.

Referring to FIG. 55, the terminal UE1 and UE2 devices may include receiving modules 5511 and 5521, transmitting modules 5512 and 5522, processors 5513 and 5523, and memories 5514 and 5524, respectively. The receiving modules 5511 and 5521 may receive various signals, data, information, and the like from the base station. The transmission modules 5512 and 5522 may transmit various signals, data, information, and the like to the base station.

The processors 5513 and 5523 receive data for 8 or less layers through the data regions of the downlink subframe through the receiving modules 5511 and 5521, and receive 8 or less layers on a predetermined OFDM symbol of the downlink subframe. The terminal may be controlled to receive a reference signal for a layer, and the terminal may be controlled to estimate a channel in order to demodulate data for 8 or less layers using the received reference signal. Reference signals for layers of 8 or less are disposed on 24 or less resource elements within 2 resource blocks (resource block pairs) contiguous in time in the downlink subframe, and some of the reference signals for layers of 8 or less are one The resource element may be multiplexed by a code division multiplexing (CDM) scheme.

In addition to the processor (5513, 5523) performs a function of processing the information received by the terminal device, information to be transmitted to the outside, etc., the memory (5514, 5524) can store the processed information, etc. for a predetermined time, It may be replaced by a component such as a buffer (not shown).

Meanwhile, the base station (eNB) device may include a receiving module 5531, a transmitting module 5532, a processor 5533, and a memory 5534. The receiving module 5531 may receive various signals, data, information, and the like from the terminal. The transmission module 5552 may transmit various signals, data, information, and the like to the terminal.

The processor 5533 transmits data for 8 or less layers through a data module of a downlink subframe through a transmission module, and transmits a reference signal for 8 or less layers on a predetermined OFDM symbol of a downlink subframe. Can be controlled. The reference signal is a dedicated reference signal (DRS) for demodulating data for layers of 8 or less, and the reference signal for layers of 8 or less is 24 within 2 consecutive resource blocks (resource block pairs) in downlink subframes. Some of the reference signals for the 8 or less layers disposed on the following resource elements may be multiplexed by a Code Division Multiplexing (CDM) scheme on one resource element.

In addition, the processor 5533 performs a function of processing the information received by the terminal device, information to be transmitted to the outside, and the like, and the memory 5534 may store the processed information for a predetermined time and may include a buffer (not shown). May be replaced by a component such as).

Embodiments of the present invention described above may be implemented through various means. For example, embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.

For implementation in hardware, a method according to embodiments of the present invention may include one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), and Programmable Logic Devices (PLDs). It may be implemented by field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, the method according to the embodiments of the present invention may be implemented in the form of a module, a procedure, or a function that performs the functions or operations described above. The software code may be stored in a memory unit and driven by a processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The foregoing description of the preferred embodiments of the invention disclosed herein has been presented to enable any person skilled in the art to make and use the present invention. While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. For example, those skilled in the art can utilize each of the configurations described in the above-described embodiments in a manner of mutually combining them. Accordingly, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The invention can be embodied in other specific forms without departing from the spirit and essential features of the invention. Accordingly, the above detailed description should not be interpreted as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention. The present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. In addition, the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship or may be incorporated as new claims by post-application correction.

5531 Receive Module 5532 Receive Module
5533 Processor 5534 Memory

Claims (10)

A method of transmitting a reference signal to a terminal by a base station using 8 or less layers,
Transmitting data for the 8 or less layers through a data region of a downlink subframe; And
Transmitting a reference signal for the 8 or less layer on a predetermined OFDM symbol of the downlink subframe,
The reference signal is a dedicated reference signal (DRS) for demodulating data for the layer 8 or less.
Reference signals for the 8 or less layers are disposed on 24 or less resource elements in an RB pair of the downlink subframe,
Some of the reference signals for the 8 or less layers are multiplexed by one of the code division multiplexing (CDM) schemes on one resource element. The method of claim 1,
Reference signals for 2, 3, 4 or 6 layers of the reference signals for the 8 or less layers are multiplexed by the CDM scheme on the one resource element. The method of claim 1,
Each of the reference signals for the 8 or less layers is disposed on 4 or more resource elements in a resource block pair (RB Pair) of the downlink subframe. The method of claim 1,
Reference signals for the first and second layers are arranged on 12 resource elements in an RB pair of the downlink subframe,
Reference signals for the third and fourth layers are arranged on 8 resource elements in a resource block pair (RB Pair) of the downlink subframe,
The reference signal for the fifth to eighth layers is disposed on four resource elements in a resource block pair (RB Pair) of the downlink subframe. A method of processing a reference signal received from a base station by a terminal using 8 or less layers,
Receiving data for the 8 or less layers through a data region of a downlink subframe;
Receiving a reference signal for the 8 or less layer on a predetermined OFDM symbol of the downlink subframe; And
Estimating a channel to demodulate data for the 8 or less layers using the received reference signal;
Reference signals for the 8 or less layers are disposed on 24 or less resource elements in an RB pair of the downlink subframe,
The reference signal processing method of claim 8, wherein some of the reference signals for the 8 or less layers are multiplexed by a code division multiplexing (CDM) scheme on one resource element. The method of claim 5, wherein
Reference signals for 2, 3, 4 or 6 layers of the reference signals for the 8 or less layers are multiplexed by the CDM scheme on the one resource element. The method of claim 5, wherein
Each of the reference signals for the 8 or less layers is disposed on 4 or more resource elements within a resource block pair (RB Pair) of the downlink subframe. The method of claim 5, wherein
Reference signals for the first and second layers are arranged on 12 resource elements in an RB pair of the downlink subframe,
Reference signals for the third and fourth layers are arranged on 8 resource elements in a resource block pair (RB Pair) of the downlink subframe,
The reference signal for the fifth to eighth layers is disposed on four resource elements in a resource block pair (RB Pair) of the downlink subframe. A base station for transmitting a reference signal to a terminal using a layer of 8 or less,
A receiving module for receiving an uplink signal from the terminal;
A transmission module for transmitting a downlink signal to the terminal; And
A processor connected to the receiving module and the transmitting module and controlling the base station including the receiving module and the transmitting module,
The processor comprising:
Control to transmit data for the layer 8 or less through the data module of the downlink subframe through the transmission module, and transmit a reference signal for the layer 8 or less on a predetermined OFDM symbol of the downlink subframe. and,
The reference signal is a dedicated reference signal (DRS) for demodulating data for the layer 8 or less.
Reference signals for the 8 or less layers are disposed on 24 or less resource elements in an RB pair of the downlink subframe,
The reference signal transmission base station of claim 8, wherein some of the reference signals for the layers of 8 or less are multiplexed by a code division multiplexing (CDM) scheme on one resource element. A terminal for processing a reference signal received from a base station using a layer of 8 or less,
A receiving module for receiving control information and data from the base station;
A transmission module for transmitting control information and data to the base station; And
A processor connected to the receiving module and the transmitting module and controlling the terminal including the receiving module and the transmitting module,
The processor comprising:
Through the receiving module, to receive data for the layer 8 or less through the data region of the downlink subframe, and to receive the reference signal for the layer 8 or less on a predetermined OFDM symbol of the downlink subframe. Control,
The terminal is controlled to estimate a channel to demodulate data for the layer 8 or less using the received reference signal,
Reference signals for the 8 or less layers are disposed on 24 or less resource elements in an RB pair of the downlink subframe,
Some of the reference signals for the 8 or less layers are multiplexed by a Code Division Multiplexing (CDM) scheme on one resource element.

Images