WO2014042356A1 - Method for transmitting control information of transceiving point and said transceiving point, method for receiving control information for terminal and said terminal - Google Patents

Abstract

The present invention relates to a method for transmitting control information of a transceiving point, which transmits control information to a terminal through a data area of a physical resource block pair of a subframe. The method includes the steps of: configuring at least one localized type downlink control channel set for some physical resource block pairs from among the physical resource block pairs; configuring at least one distributed type downlink control channel set for some other physical resource block pairs; and allocating control channel elements to 8 resource element groups, which have different indexes for which the remainders are the same, which are obtained by dividing enhanced resource element groups by 4, which groups are configured with resource elements having the same index with respect to resource elements to which 16 numbers, which are from the physical resource block pairs, are given as indexes repetitively on the basis of frequency priority, and transmitting control information to the terminal through at least one of the control channel elements.

Description

Control information transmission method of the transmission and reception point and the transmission and reception point, the control information reception method of the terminal and the terminal

The present invention relates to a method for transmitting control information of a transmission / reception point for a terminal for receiving downlink control information through a downlink control channel introduced into a data region, a method for receiving control information of a terminal, and apparatuses thereof.

In a wireless communication system capable of transmitting data to more users, the increase in system capacity is limited due to the resources of the conventional limited control region, thereby increasing the need for transmitting downlink control information through a downlink control channel located in the data region.

On the other hand, to a new control channel element for allocating a downlink control channel located in the data area corresponding to a control channel element for allocating a downlink control channel in an existing control area. Resource allocation method is required.

The present invention provides an Enhanced Control Channel Element (ECCE) / Enhanced Resource Element Group (EREG) mapping method for downlink control channel transmission in the data domain. The present invention also provides a method and apparatus for indexing ECCE in an arbitrary Enhanced Physical Downlink Control Channel (EPDCCH) set and a distributed EPDCCH set.

The present invention is a method for transmitting control information of a transmission / reception point for transmitting control information to a terminal through data regions of resource block pairs (Physical Resource Block pairs) of a subframe, at least one of resource block pairs of some of the resource block pairs. Configuring a localized downlink control channel set of at least one distributed downlink control channel set for resource block pairs of other portions of the resource block pairs; step; 16 numbers in each of the pairs of resource blocks are divided by four of the enhanced resource element groups composed of resource elements having the same index with respect to the resource elements having the same index. Allocating control channel elements to four resource element groups of different indices having the same index, or dividing by two, to eight resource element groups of different indices, wherein the control is performed in the centralized downlink control channel set. The resource element groups constituting the channel element are located in one resource block pair and the resource element groups constituting the control channel element in the distributed downlink control channel set are located in two or more resource block pairs; And transmitting control information to the terminal through at least one control channel element among the control channel elements.

The present invention is a method for receiving control information of a terminal for receiving control information from a transmission / reception point through data regions of resource block pairs (Physical Resource Block pairs) of a subframe, and repeating 16 numbers in each of the resource block pairs with frequency priority. 4 or 4 resource element groups of different indexes, the remainder of which is divided by 4 of the enhanced resource groups composed of resource elements having the same index for the resource elements assigned to the index. Receiving a radio signal through at least one control channel element among control channel elements allocated to eight resource element groups of the same different index, the remainder of which is divided by-for resource block pairs of some of the resource block pairs At least one localized enhanced downlink control channel set is established. At least one distributed downlink control channel set is configured for resource block pairs of other portions of the resource block pairs, and configures the control channel element in the centralized downlink control channel set. Resource element groups are located in one resource block pair, and the resource element groups constituting the control channel element in the distributed downlink control channel set are located in two or more resource block pairs; And obtaining the control information from the radio signal.

The present invention is a transmission and reception point for transmitting control information to a terminal through a data area of physical resource block pairs of a subframe, at least one localized to the resource block pairs of some of the resource block pairs Configure an enhanced physical downlink control channel set, and configure at least one distributed downlink control channel set for resource block pairs of other portions of the resource block pairs, and the resource block pairs The remainder divided by 4 of the Resource Element Groups consisting of resource elements having the same index for the Resource Elements which are repeated by frequency-priority 16 numbers in each is indexed. 4 resource element groups of different indexes or 8 of different indexes with the remainder divided by 2 Control unit for allocating control channel elements to the resource element groups of the centralized downlink control channel set in the resource element groups constituting the control channel element is located in one resource block pair in the distributed downlink control channel set Resource element groups constituting the control channel element are located in at least two resource block pairs; And a transmitter for transmitting control information to the terminal through at least one control channel element among the control channel elements.

The present invention is a terminal for receiving control information from a transmission / reception point through a data region of physical resource block pairs of a subframe, and a resource in which 16 numbers in each of the resource block pairs are repeated with frequency priority first and assigned an index. Four of the Resource Element Groups of resource elements that have the same index for the Resource Elements divided by four equal the remainder divided by four or four Resource Element Groups of the same index. A receiver for receiving a radio signal through at least one control channel element among control channel elements allocated to eight resource element groups of different indexes. At least one centralized type for resource block pairs of some of the resource block pairs. (localized) an Enhanced Physical Downlink Control Channel is configured and the child At least one distributed downlink control channel set is configured for resource block pairs of other portions of the block pairs, and the resource element groups constituting the control channel element in the centralized downlink control channel set are one. Resource element groups, which are located in a resource block pair of and constitute the control channel element in the distributed downlink control channel set, are located in two or more resource block pairs; And a control unit obtaining the control information from the radio signal.

1 illustrates an example of a wireless communication system to which embodiments are applied.

FIG. 2 illustrates one resource block pair in the case of a normal cyclic prefix (CP) as an example of a structure of a downlink resource in a Long Term Evolution (LTE) or LTE-Advanced (LTE-A) system.

3 shows two types of EPDCCH transmissions: centralized EPDCCH transmission and distributed EPDCCH transmission.

FIG. 4 is an example of resource element (RE) mapping of a PRB paired physical resource block (PRB) indexed by a symbol reference cyclic shift with respect to one transmit antenna port (Cell-specific reference signal (CRS) port 0) It is also.

5 shows an example of RE mapping of PRREG pairs EREG indexed with symbol-based cyclic shifts for two transmit antenna ports (CRS ports 0 and 1).

FIG. 6 shows an example of RE mapping of PRREG pairs EREG indexed with symbol reference cyclic shifts for four transmit antenna ports ( CRS ports 0, 1, 2, 3).

FIG. 7 is an example of RE mapping of PRREG pairs that are EREG indexed without cyclic shift for one transmit antenna port (CRS port 0).

FIG. 8 is an example of RE mapping of PRREG pairs EREG indexed without cyclic shift for two transmit antenna ports (CRS ports 0 and 1).

FIG. 9 is an example of RE mapping of PRREG pairs EREG indexed without cyclic shift for four transmit antenna ports ( CRS ports 0, 1, 2, 3).

10 is a diagram illustrating EREG mapping of a centralized EPDCCH set according to the first and second embodiments.

11 is a configuration diagram of an ECCE in a distributed EPDCCH set according to the third embodiment.

12 is a configuration diagram of an ECCE in a distributed EPDCCH set according to the embodiment 4-1.

13 is a configuration diagram of an ECCE in a distributed EPDCCH set according to the embodiment 4-2.

14 is a configuration diagram of an ECCE in a distributed EPDCCH set according to the embodiment 4-3.

15 is a flowchart illustrating a method for transmitting control information of a transmission / reception point according to an embodiment of the present invention.

16 is a flowchart illustrating a method for receiving control information of a terminal according to another embodiment of the present invention.

17 is a diagram showing the configuration of a transmission and reception point according to another embodiment of the present invention.

18 is a diagram illustrating a configuration of a terminal according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data, and the like. The wireless communication system includes a user equipment (UE) and a transmission / reception point. In the present specification, a user terminal is a comprehensive concept of a terminal in wireless communication. In addition to user equipment (UE) in WCDMA, LTE, and HSPA, as well as MS (Mobile Station), UT (User Terminal), SS in GSM, It should be interpreted as a concept that includes a subscriber station, a wireless device, and the like.

A transmission / reception point generally refers to a station communicating with a user terminal, and includes a base station (BS) or a cell, a node, a node-B, an evolved node-B, and a sector. ), A site, a base transceiver system (BTS), an access point, an access point, a relay node, a remote radio head (RRH), and a radio unit (RU).

That is, in the present specification, a base station or a cell is interpreted in a comprehensive sense to indicate some areas or functions covered by a base station controller (BSC) in CDMA, a NodeB in WCDMA, an eNB or a sector (site) in LTE, and the like. It is meant to cover various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, remote radio head (RRH), and radio unit (RU) communication range.

In this specification, a user terminal and a transmission / reception point are used in a generic sense as two transmission / reception entities used to implement the technology or technical idea described in the present specification, and are not limited by the terms or words specifically referred to. The user terminal and the transmission and reception point is used in a comprehensive sense as two (uplink or downlink) transmission and reception subjects used to implement the technology or the technical idea described in the present invention and are not limited by the terms or words specifically referred to. Here, the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to the base station by the user terminal, the downlink (Downlink, DL, or downlink) means to transmit and receive data to the user terminal by the base station It means the way.

There is no limitation on the multiple access scheme applied to the wireless communication system. Various multiple access techniques such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM-TDMA, OFDM-CDMA Can be used. One embodiment of the present invention can be applied to resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB. The present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.

The uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.

In addition, in a system such as LTE and LTE-A, a standard is configured by configuring uplink and downlink based on one carrier or a pair of carriers. Uplink and downlink transmit control information through control channels such as Physical Downlink Control CHannel (PDCCH), Physical Control Format Indicator CHannel (PCFICH), Physical Hybrid ARQ Indicator CHannel (PHICH), and Physical Uplink Control CHannel (PUCCH). A data channel is configured such as PDSCH (Physical Downlink Shared CHannel), PUSCH (Physical Uplink Shared CHannel) and the like to transmit data.

In the present specification, a cell means a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be. In the present specification, a transmission / reception point refers to a transmission point for transmitting / transmitting a signal or a reception point for receiving a signal, and a combination of these.

1 illustrates an example of a wireless communication system to which embodiments are applied.

Referring to FIG. 1, a wireless communication system 100 to which embodiments are applied includes a coordinated multi-point transmission / reception system (CoMP system) or cooperative system in which two or more transmission / reception points cooperate to transmit a signal. It may be a coordinated multi-antenna transmission system, a cooperative multi-cell communication system. The CoMP system 100 may include at least two transmission / reception points 110 and 112 and terminals 120 and 122.

The transmit / receive point has a high transmission power or a low transmission power in a macro cell region, which is connected to an eNB or a macro cell (macro cell 110, hereinafter referred to as an 'eNB') and an eNB 110 by a wired or optically controlled cable. It may be at least one RRH 112 having a. The eNB 110 and the RRH 112 may have the same cell ID or may have different cell IDs.

Hereinafter, downlink (downlink) means a communication or communication path from the transmission and reception points (110, 112) to the terminal 120, the uplink (uplink) from the terminal 120 to the transmission and reception points (110, 112) Or a communication path. In downlink, the transmitter may be part of the transmission / reception points 110 and 112 and the receiver may be part of the terminals 120 and 122. In uplink, the transmitter may be part of the terminal 120 and the receiver may be part of the transmission / reception points 110 and 112.

Hereinafter, a situation in which signals are transmitted and received through channels such as a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), and the like, may be used. Sometimes, PDSCH is transmitted and received.

The eNB performs downlink transmission to the terminals. The eNB includes downlink control information and an uplink data channel (eg, a physical downlink shared channel (PDSCH), which is a primary physical channel for unicast transmission, and scheduling required to receive the PDSCH. For example, a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission on a physical uplink shared channel (PUSCH) may be transmitted. Hereinafter, the transmission and reception of signals through each channel will be described in the form of transmission and reception of the corresponding channel.

In wireless communication, one radio frame (radioframe) consists of 10 subframes, and one subframe consists of two slots. The radio frame has a length of 10 ms and the subframe has a length of 1.0 ms. In general, the basic unit of data transmission is a subframe unit, and downlink or uplink scheduling is performed on a subframe basis. One slot includes seven (or normal cyclic prefix) or 6 (or extended CP) orthogonal frequency division modulation (OFDM) symbols in the time domain.

In the wireless communication, the frequency domain may be configured by, for example, a subcarrier unit of 15 kHz interval.

In downlink, time-frequency resources may be configured in units of resource blocks (RBs). The resource block may consist of one slot on the time axis and 180 kHz (12 subcarriers) on the frequency axis. One subcarrier (two slots) on the time axis A resource consisting of 12 subcarriers on the frequency axis may be referred to as a resource block pair (RBP). The total number of resource blocks varies according to system bandwidth.

The resource element (RE) may consist of one OFDM symbol on the time axis and one subcarrier on the frequency axis. One resource block pair may include 14 × 12 resource elements or 12 × 12 resource elements.

FIG. 2 illustrates one resource block pair in the case of a normal cyclic prefix (CP) as an example of a structure of a downlink resource in a Long Term Evolution (LTE) or LTE-Advanced (LTE-A) system.

Referring to FIG. 2, in the case of a normal CP, one resource block pair includes 14 OFDM symbols (l = 0 to 13) and 12 subcarriers (k = 0 to 11). In the example of FIG. 2, a region (l = 0 to 2) consisting of three OFDM symbols in front of fourteen OFDM symbols belonging to one resource block pair includes physical control format information channel (PCFICH) and physical hybrid ARQ indicator (PHICH). A control region 210 allocated for a control channel such as a CHannel), a physical downlink control channel (PDCCH), etc., and the remaining regions (l = 3 to 13) are allocated for a data channel such as a physical downlink shared channel (PDSCH). It may be a data region 220. Although three OFDM symbols are shown in FIG. 2 for the control region 210, it is possible to assign 1 to 4 OFDM symbols for the control region 210. The size information of the OFDM symbol of the control region 210 may be transmitted through the PCFICH.

The PDCCH may be transmitted over the entire system band, and the PDSCH may be transmitted on a resource block basis. The user terminal may first check the PDCCH set for the user, and if there is no data corresponding to the user, take a micro sleep mode to reduce power consumption of the user terminal in the data area 120.

Referring to FIG. 2, a reference signal may be mapped to a specific resource element of downlink. That is, the common reference signal or cell-specific reference signal (CRS) 230, the demodulation reference signal or the UE-specific reference signal (DeModulation Reference Signal or UE-specific Reference Signal) in the downlink DM- RSs 232 and 234 and a Channel Status Information Reference Signal (CSI-RS) may be transmitted. In FIG. 2, only the CRS 230 and the DM- RSs 232 and 234 are shown for convenience of description.

The CRS 230 in the control region 210 may be used for channel estimation for decoding the PDCCH, and the CRS 230 in the data region 220 may be used for downlink channel measurement. Channel estimation for data decoding of the data region 220 may be performed using the DM- RSs 232 and 234. The DM- RSs 232 and 234 are multiplexed with reference signals for a plurality of layers using orthogonal codes. For example, in the case of four layer transmission, an orthogonal code having a length of 2 may be applied to two reference signal resource elements consecutive in the time axis, and two different reference signals may be multiplexed for each reference signal group. In the case of layer transmission, four orthogonal signals having a length of 4 may be applied to four reference signal resource elements distributed in the time axis, thereby multiplexing four different reference signals for each reference signal group.

In case of one or two layer transmission, since only one DM-RS group 1 232 can transmit the reference signal of each layer, the other DM-RS group 2 234 can be used as data transmission. have. DM-RS corresponding to each layer is transmitted by applying the same precoding applied to the layer. This enables decoding of data at the receiving end (terminal) without the information of precoding applied at the transmitting end (base station).

In a wireless communication system, a control channel is required to efficiently use limited resources. However, the resources of the control area 210 reduce the resources of the data area 220 used for data transmission as overhead of the system. In an OFDM-based LTE system, one resource block pair consists of 14 or 12 OFDM symbols, of which up to three OFDM symbols are used for the control region 210 and the remaining OFDM symbols are used for the data region 220. I use it. Meanwhile, in the LTE-A system capable of transmitting data to more users, the increase in system capacity may be limited due to the resources of the conventional limited control area 210. Therefore, an increase in control channel resources is inevitable, and thus a control channel transmission / reception method for multiple users using a spatial division multiplexing technique in the data region 220 may be considered. This method is to transmit and receive a control channel in the data area 220. For example, the control channel transmitted in the data region 220 may be called EPDCCH (Extended PDCCH or Enhanced PDCCH), but is not limited thereto.

In the existing 3GPP LTE / LTE-A rel-8 / 9/10 system, all UEs receive 1 ~ 3 OFDM symbols (system band> 10PRBs) or 2 ~ in front of a downlink subframe to receive a downlink DCI. It depends on the Physical Downlink Control Channel (PDCCH) transmitted on 4 OFDM symbols (system band ≤ 10 PRBs). The basic unit of PDCCH transmission for any terminal is a control channel element (CCE), and one CCE is composed of nine resource element groups (REGs). One REG is included in REs except for PCFICH, which is another physical channel present in the PDCCH region of the corresponding downlink subframe, and resource elements (REs) to which a PHICH and a cell-specific reference signal (CRS) are transmitted. 4 consecutive REs on the frequency axis.

In order to map an EPDCCH transmission resource for an arbitrary UE, EREG (Enhanced REG) / ECCE (Enhanced CCE) may be introduced into the EPDCCH corresponding to the concept of REG and CCE of the conventional PDCCH.

EPDCCH, which is newly introduced in 3GPP LTE / LTE-A release 11 and subsequent systems, is transmitted through a PDSCH region of a downlink pilot time slot (DwPTS) of a downlink subframe or a special subframe unlike the legacy PDCCH. For each UE configured to receive downlink control information (DCI) through the corresponding EPDCCH, each M group of M PRBs (M is a natural number less than or equal to the number of PRBs of one or more full bands) It is defined to assign up to K configured EPDCCH sets in a corresponding cell up to K (the maximum value of K may be one of 2, 3, 4, and 6). In addition, each EPDCCH set configured for a certain UE may have a different M value.

In addition, one EPDCCH type of a distributed type or a localized type may be configured and signaled for each EPDCCH set.

Depending on the EPDCCH transmission type, the EPDCCH set may be a localized type or a distributed type. The aforementioned M may be 1 or 2 ⁿ (n = 1, 2, 3, 4 in the centralized type). , 5), but is not limited thereto. Meanwhile, M may be 2, 4, 8, or 16 in a distributed form, but is not limited thereto.

FIG. 3 illustrates two types of EPDCCH transmissions: localized EPDCCH transmission and distributed EPDCCH transmission.

Let N _{PRB be} the number of downlink physical resource blocks (PRBs) constituting a system band supported by an arbitrary cell configured by a carrier. In this case, as shown in (a) and (b) of FIG. 3, the EPDCCH transmitted through the corresponding PDSCH region may have two types of EPDCCH transmission types: centralized EPDCCH transmission and distributed EPDCCH transmission. Accordingly, the number of resource elements (REs) constituting the ECCE structure and one ECCE may vary according to each EPDCCH transmission type, but may also be the same regardless of the EPDCCH transmission type.

The centralized EPDCCH transmission shown in (a) of FIG. 3 means that one ECCE is located in one resource block pair and transmitted. Meanwhile, the distributed EPDCCH transmission shown in FIG. 3B means that one ECCE is transmitted in at least two resource block pairs.

On the other hand, K (K is a natural number of 2 or more) EPDCCH sets may be allocated to one UE. Since each EPDCCH set is a distributed type or a centralized type, KL (KL is a natural number of 1 or more) for one UE may be allocated. The centralized type EPDCCH and KD (KD is one or more natural numbers) of distributed type EPDCCHs may be allocated. In other words, KL + KD = K.

According to the newly introduced EREG / ECCE, not only the frame structure type, subframe configuration, and cyclic prefix length, but also the legacy PDCCH control for one PRB pair constituting each EPDCCH set A total of 16 EREGs are constructed from EREG # 0 to EREG # 15 in the corresponding PRB pair, regardless of the size of the region and the presence of other reference signals (for example, CRS, CSI-RS, PRS, etc.) except DM-RS. can do.

Specifically, in case of normal CP for one PRB pair constituting any EPDCCH set, 16 numbers for 144 REs except for 24 REs for DM-RS among 12 x 14 = 168 REs in total EREG indexing from 0 to 15 can be performed in a frequency first and then time manner. In the case of the extended CP, a frequency first method likewise for 16 REs except for 16 REs for DM-RS among 12 x 12 = 144 REs constituting one PRB pair is frequency first. and then time manner) can be indexed EREG from 0 to 15.

Examples of EREG indexing in one PRB pair constituting an arbitrary EPDCCH set in a downlink subframe corresponding to a normal CP are shown in FIGS. 4 to 9 below. However, in Figs. 4 to 9 below, parts indicated by hatching and not indicated by the numbers indicate REs used for DM-RS, and parts indicated by numbers indicating lattice or hatched and indicated by RE are transmitted by the CRS. Indicates.

4 illustrates an example of RE mapping of PRREG pairs EREG indexed with a symbol reference cyclic shift with respect to one transmit antenna port (CRS port 0).

Referring to FIG. 4, the EREG is indexed in a frequency-prioritized manner from 0 to 15, and indexed by the symbol-based cyclic shift to index 12 of the second symbol in the index 11 of the first symbol. . In the same manner, index 8 of the third symbol is indexed adjacent to index 7 of the second symbol.

The PRB pair shown in FIG. 4 is for CRS port 0, and CRSs are mapped to eight REs as shown in FIG. 3. The CRS may be mapped to another location by frequency shifts.

FIG. 5 shows an example of RE mapping of PRREG pairs EREG indexed with symbol-based cyclic shifts for two transmit antenna ports (CRS ports 0, 1), and FIG. 6 shows four transmit antenna ports ( CRS ports 0, 1, An example of RE mapping of PRREG pairs EREG indexed with symbol reference cyclic shift for 2, 3).

The REs shown in FIGS. 5 and 6 are indexed with symbol-based cyclic shifts in the same manner as shown in FIG. 4, and FIG. 5 shows an additional eight in addition to the CRS shown in FIG. 4 for CRS ports 0, 1. CRSs are mapped to REs, and in FIG. 6, CRSs are further mapped to eight REs in addition to the CRSs shown in FIG. 5 for CRS ports 0, 1, 2, and 3.

4 to 6 described above are examples of applying a cyclic shift (cyclic shift) when EREG indexing for each OFDM symbol, and FIGS. 7 to 9 to be described below are examples of not applying a cyclic shift. .

FIG. 7 shows an example of RE mapping of a PRREG pair EREG indexed without cyclic shift for one transmit antenna port (CRS port 0), and FIG. 8 shows cyclic for two transmit antenna ports (CRS ports 0, 1). RE mapping example of an EREG indexed PRB pair without shift. FIG. 9 is an exemplary RE mapping example of an EREG indexed PRB pair without cyclic shift for four transmit antenna ports ( CRS ports 0, 1, 2, and 3). .

In FIGS. 7 to 9, CRSs are mapped in the same manner as the CRS mappings of FIGS. 4 to 6, respectively. However, there is a difference in the way of indexing.

Referring to FIG. 7, the EREG is indexed in a frequency-priority manner with numbers from 0 to 15, and also indexed without the symbol reference cyclic shift so that index 12 of the second symbol is indexed adjacent to index 11 of the first symbol. It is being indexed away. In the same way, index 8 of the third symbol, which is the next order of index 7 of the second symbol, is indexed without being contiguous.

In FIGS. 4 to 9, REs having the same index are grouped into one EREG. Therefore, a total of 16 EREGs from EREG # 0 to EREG # 15 are allocated to one PRB pair. 4 to 9 illustrate examples of the PRB pair of the normal CP, but in the same manner, 16 EREGs are allocated to the PRB pair of the extended CP from EREG # 0 to EREG # 15.

4 to 9, each of the EREG # 0, EREG # 1,... Set in one PRB pair. , EREG # 15 may consist of 9 REs each. However, the number of REs that can be actually used for EPDCCH transmission for each EREG may vary according to the number of transmit antenna ports (CRS port number) and the legacy PDCCH size, as shown in the above figure.

Referring to FIG. 4 again, if there are nine REs corresponding to index # 0, but the third region is set as a control region, EPDCCH cannot be transmitted to the REs of the region, except for the RE corresponding to this region. And EREG # 0 consists of all six available REs. In the case of EREG corresponding to index # 1, there are 9 REs indexed by # 1, but 5 of EREG # 1 can be used except for the RE to which the third control region and CRS are mapped (see the upper right of FIG. 4). It will consist of an RE.

ECCE, which is a basic unit of EPDCCH transmission, may be composed of N EREGs according to subframe type and CP length, respectively. Specifically, the N value may be determined as follows.

First, N = 4 may be set for 3, 4, and 8 of a normal subframe corresponding to a normal CP and a special subframe corresponding to a normal CP. That is, in this case, four ECCEs may be configured with four EREGs for each of 16 EREGs constituting one PRB pair.

In another case, the normal subframe corresponding to the extended CP, the special subframes 1, 2, 6, 7 and 9 corresponding to the normal CP, and the special subframes 1, 2, 3, corresponding to the extended CP, N and 8 can be set for 5 and 6. In this case, two ECCEs may be configured with eight EREGs for each of 16 EREGs constituting one PRB pair.

In the case of the conventional PDCCH, in the case of a random DL subframe, transmission is performed through the previous 1 to 3 OFDM symbols or 2 to 4 OFDM symbols, and 9 REGs constitute one CCE. . Therefore, PDCCH CCEs may be configured with 9 × 4 = 36 REs.

However, in the case of EPDCCH, as described with reference to FIGS. 4 through 9, the EREG for each REREG is not considered without considering the legacy control region size (ie, legacy PDCCH size) and other REs used as other reference signals such as CRS and CSI-RS. Since indexing is performed, the number of REs that can be actually used for EPDCCH transmission varies depending on the size of the legacy control region and the presence of other reference signals in any downlink subframe. That is, the number of REs available for EPDCCH transmission may vary for each EREG. Therefore, in the case of ECCE which is a basic unit of actual EPDCCH transmission, there is a possibility that an imbalance occurs in the number of REs actually available for each ECCE.

4 to 9, each of the EREG # 0, EREG # 1, ..., EREG # 15 set in one PRB pair is composed of nine REs. However, the number of REs that can be actually used for EPDCCH transmission for each EREG is determined by the number of CRS ports and the legacy PDCCH size as shown in FIGS. 4 to 9. Tables 1 to 3 below show EPDCCH transmission for each EREG index in one PRB pair constituting an arbitrary EPDCCH set according to legacy PDCCH size and CRS port setting in a normal downlink subframe based on FIG. 4. This is a table showing the number of REs available.

TABLE 1

Table 1 is a table listing the number of available REs for each EREG according to each CRS port configuration when the legacy PDCCH size is 1. Table 1 summarizes EREG indexing based on which cyclic shift is not applied.

TABLE 2

Table 2 summarizes the number of available REs for each EREG according to each CRS port configuration when the legacy PDCCH size is 2. Table 2 summarizes EREG indexing based on which cyclic shift is not applied.

TABLE 3

Table 3 is a table listing the number of available REs for each EREG according to each CRS port configuration when the legacy PDCCH size is 3. Table 3 summarizes EREG indexing based on cyclic shift.

Referring to Tables 1 to 3, it can be seen that the number of REs that can be actually used for EPDCCH transmission for each EREG is different. For this reason, the number of REs that can be used in each ECCE may vary depending on the manner in which the EREG is allocated to the ECCE.

In view of such a problem, the present invention provides a method of mapping EREGs constituting each ECCE. In particular, the present invention provides a method of ECCE / EREG mapping in EPDCCH sets of localized type and distributed type.

Specifically, the present invention provides a method for configuring each ECCE in M PRB pairs that constitute an EPDCCH set of a localized type and a distributed type as described above. In particular, the present invention considers the legacy PDCCH and CRS transmitted through the DwPTS region of all downlink subframes and special subframes, and optimal ECCE / EREG mapping considering the number of REs that can be used for EPDCCH transmission in a corresponding PRB pair. Provide a method.

In addition, in the case of distributed EPDCCH transmission, in order to maximize frequency diversity gain, EREGs constituting one ECCE may be distributed to M PRB pairs constituting the EPDCCH set. In view of the above, the present invention provides an ECCE / EREG mapping method in a distributed type EPDCCH set.

For the description of the present invention, M PRB pairs constituting an arbitrary EPDCCH set are referred to herein as an Enhanced Physical Resource Block (EPRB) for distinguishing from a PRB, which is a unit of a conventional PDSCH transmission, and corresponding EPRB index # m is a sequence of PRB indexes of the PRB pairs constituting the EPDCCH set, and EPRB # 0, ..., EPRB from the PRB pair having the lowest PRB index to the PRB pair having the largest PRB index, respectively. Index with # (M-1).

Example 1 ECCE Configuration with N Consecutive EREGs

Embodiment 1 provides a method of configuring N consecutive EREGs as one ECCE in one PRB pair constituting the EPDCCH set, and thus a method of indexing the ECCE.

In the example of Table 1 (legacy PDCCH size 1), when combining four consecutive EREGs according to Embodiment 1 to configure one ECCE, the number of EREGs constituting each ECCE and the number of available REs for each ECCE is It is configured as shown in Table 4.

TABLE 4

For four transmit antenna ports (4 Tx CRS), there are 26 usable REs of 1 ^st ECCE and 33 usable REs of 4 ^th ECCE, up to 7 REs from each other. As such, there is a large imbalance between the available REs constituting each ECCE.

This has similar characteristics when the legacy PDCCH sizes are 2 (Table 5) and 3 (Table 6).

In case of configuring one ECCE by combining four consecutive EREGs in the situation as shown in Table 2 (legacy PDCCH size 2), the number of EREGs constituting each ECCE and the number of usable REs for each ECCE is shown in Table 5. .

TABLE 5

There are 22 usable REs of 1 ^st ECCE and 29 usable REs of 4 ^th ECCE for four transmission antenna ports (4 Tx CRS).

When configuring one ECCE by combining four consecutive EREGs in the situation as shown in Table 3 (legacy PDCCH size 3), the number of EREGs constituting each ECCE and the number of usable REs for each ECCE are shown in Table 6 do.

TABLE 6

There are 18 usable REs of 1 ^st ECCE and 25 usable REs of 4 ^th ECCE for four transmission antenna ports (4 Tx CRS).

Accordingly, when the EPDCCH set is a localized type in any EPDCCH set composed of M physical resource block (PRB) groups (a group of X PRBs) (X is 2, 4, 8, or 16), ECCEs constituting the EPDCCH set may be configured as follows according to the first embodiment.

In more detail, for the M PRBs constituting any centralized EPDCCH set, the ECCE configured according to the first embodiment may be indexed in ascending order from the lowest PRB pair (PRB pair having the smallest PRB index).

Referring to (a) of FIG. 10, a 1 ^st ECCE composed of EREG # 0 to EREG # 3 in the lowest PRB pair becomes ECCE # 0, and a 2 ^nd ECCE composed of EREG # 4 to EREG # 7 is ECCE # 1, respectively. , EREG # 8 ~ is the 3 ^rd ECCE consisting EREG # 11 ECCE # 2, EREG # 12 ~ EREG # 15 4 th ECCE consisting are each indexed by the ECCE # 3. Subsequently, in the PRB pair having the second lowest PRB index, each of 1 ^st , 2 ^nd , 3 ^rd , and 4 ^th consisting of EREG # 0 ~ 3, EREG # 4 ~ 7, EREG # 8 ~ 11, and EREG # 12 ~ 15, respectively ECCEs are indexed into ECCE # 4, ECCE # 5, ECCE # 6, and ECCE # 7, respectively. In this way, up to four ECCEs configured in the PRB pair having the last Mth lowest PRB index, ECCE # (4M-4), ECCE # (4M-3), ECCE # (4M-2), and ECCE # (4M- In 1), ECCE indexing of the centralized EPDCCH set and EREG mapping constituting each ECCE may be performed.

Alternatively, M PRBs constituting an arbitrary centralized EPDCCH set may be sequentially indexed from 1 ^st ECCEs consisting of EREG # 0, # 1, # 2, and # 3 in each PRB pair.

Referring to (b) of FIG. 10, M ECCEs ranging from 1 ^st ECCEs consisting of EREG # 0 to EREG # 3 of the lowest PRB to ECCEs consisting of EREG # 0 to EREG # 3 of the Mth lowest PRB index (large PRB index) In this case, the indexes may be indexed from ECCE # 0 to ECCE # (M-1) in order of the PRB including the corresponding ECCEs. Then EREG # 4, # 5, # 6, # 7 , like for the M 2 ^nd ECCE consisting of lowest PRB pairs from largest to PRB pairs from each ECCE #M in ascending ECCE # (2M-1 in each PRB pairs Indexing), and then indexing ECCE # 2M to ECCE # (3M-1) in the ascending order of PRB index for 3 ^rd ECCEs consisting of EREG # 8 to EREG # 11 of each PRB pair, and finally As such, the 4 ^th ECCEs consisting of EREG # 12 to EREG # 15 of each PRB pair may be indexed up to ECCE # 3M to ECCE # (4M-1).

[Example 2] ECCE configuration with the same EREG divided by 4 (or 2)

As can be seen from the above, constituting a single ECCE by simply tying up four consecutive EREGs results in a large imbalance of the number of REs actually available for each ECCE. In fact, the biggest reason for the imbalance is that the use of 12 consecutive REs corresponding to one OFDM symbol is determined according to the legacy PDCCH size. That is, a gap occurs between an EREG corresponding to 12 consecutive REs among 16 EREGs and four consecutive EREGs not corresponding thereto.

In order to solve this problem, Embodiment 2 provides a method of configuring one ECCE by taking an EREG index value of modulo 4 in one PRB pair constituting the EPDCCH set, dividing by 4, and combining the same EREG indexes.

Accordingly, each ECCE may be configured as follows.

EREG #n with 1 ^st ECCE: (n mod 4) = 0

2 ^nd ECCE: EREG #n with (n mod 4) = 1

3 ^rd ECCE: EREG #n with (n mod 4) = 2

4 ^th ECCE: EREG #n with (n mod 4) = 3

At this time, n = 0,1,2, ..., 15, where n is the EREG index shown in FIGS.

I.e., 1 ^st ECCE in the PRB pair in any EPDCCH set is EREG # 0, EREG # 4, EREG # 8, is composed of EREG # 12, 2 ^nd ECCE is EREG # 1, EREG # 5, EREG # 9, EREG is composed of # 13, 3 ^rd ECCE is EREG # 2, EREG # 6, EREG # 10, is composed of EREG # 14, 4 ^th ECCE is EREG # 3, EREG # 7, EREG # 11, composed of EREG # 15 do. When the ECCE is configured in this way, the available REs according to the legacy PDCCH sizes for each ECCE are calculated as follows.

When the legacy PDCCH size is 1, the number of EREGs constituting each ECCE and available REs for each ECCE is configured as shown in Table 7.

TABLE 7

When the legacy PDCCH size is 2, the number of EREGs constituting each ECCE and available REs for each ECCE is configured as shown in Table 8.

TABLE 8

When the legacy PDCCH size is 3, the number of EREGs constituting each ECCE and available REs for each ECCE is configured as shown in Table 9.

TABLE 9

As such, when modulo 4 is used in one PRB pair constituting the EPDCCH set, four EREGs having the same EREG index value are bundled to form one ECCE to solve the imbalance between the number of available REs between the ECCEs. Can be.

This may be equally applied even if a cyclic shift is performed when indexing an EREG for each OFDM symbol.

Accordingly, when the EPDCCH set is a localized type in any EPDCCH set composed of M PRB (Physical Resource Block) groups, ECCEs constituting the EPDCCH set may be configured as follows according to the second embodiment. have.

Even based on Embodiment 2, 1 ^st ECCE of the lowest PRB pair (PRB pair with the smallest PRB index) for M PRBs constituting the centralized EPDCCH set according to the two methods based on Embodiment 1 (the in the embodiment the PRB pairs according to example 2 EREG # 0, # 4, # 8, # 12 as configured ECCE) from the M-th lowest PRB index (that is, largest PRB index) for having PRB pair of the 4 ^th ECCE (the PRB ECCE indexing may be performed with ECCE # 0, ECCE # 1, .., ECCE # (4M-1) up to a pair of ECEs # 3, 7, 11, and 15 (ECCE).

Referring back to (a) of FIG. 10, for M PRBs constituting each arbitrary centralized EPDCCH set, a 1 ^st ECCE including EREG # 0, # 4, # 8, and # 12 of a lowest PRB pair is 2 ^nd ECCE indexed with ECCE # 0, EREG # 1, # 5, # 9, # 13 indexed with ECCE # 1, 3 ^rd ECCE with EREG # 2, # 6, # 10, # 14 and A 4 ^th ECCE consisting of EREG # 3, # 7, # 11, and # 15 can be indexed into ECCE # 2 and ECCE # 3, respectively. Then, it is indexed to the respective ECCE # 4 ~ # 7 ECCE in the same sequence in the 2 ^nd lowest PRB pair. In this way, the 4 ^th ECCE of the PRB pair having the last Mth lowest PRB index (ECCE consisting of EREG # 3, 7, 11, and 15 of the PRB pair) is set to ECCE # (4M-1). Can be indexed.

Referring back to FIG. 10 (b) as another method, ECCEs in order from 1 ^st ECCEs (ECCEs consisting of EREG # 0, # 4, # 8, and # 12 in each PRB pair) of each PRB pair Index # 0 to ECCE # (M-1), then index ECCE #M to ECCE # (2M-1) in the same order for the 2 ^nd ECCEs of each PRB pair, as well as for each PRB pair It can be indexed as ECCE # 2M to ECCE # (3M-1) for 3 ^rd ECCEs and ECCE # 3M to ECCE # (4M-1) for the last 4 ^th ECCEs of each PRB pair.

Up to now, the downlink subframe (normal subframe) and the special subframe (3,4,8) of the normal CP corresponding to the case where the number of EREG constituting the one ECCE is 4 (that is, when N = 4 above) An ECCE / EREG mapping method and an ECCE indexing method according to any centralized EPDCCH set applicable to (normal CP) have been described.

Similarly, the downlink subframe (normal subframe) of the extended CP corresponding to the case where the number of EREGs constituting one ECCE is 8 (that is, when N = 8), special subframes 1,2,6, The same ECCE / EREG mapping method and corresponding ECCE indexing method may be applied to the centralized EPDCCH set configured in 7,9 (normal CP) and special subframes 1,2,3,5,6 (extended CP). .

That is, in Embodiment 1, instead of configuring four ECCEs by tying four consecutive EREGs out of 16 EREGs configuring the PRB pair for any PRB pair configuring each centralized EPDCCH set, 8 The two EREGs may be bundled to configure 1 ^st ECCE (EREG # 0 to EREG # 7) and 2 ^nd ECCE (EREG # 8 to EREG # 15), respectively. Likewise, in Embodiment 2, four EREGs having the same EREG index value are obtained when modulo 4 is applied to 16 EREGs constituting the PRB pair for any PRB pair constituting any centralized EPDCCH set. Each ECCE can be configured with eight EREGs having the same EREG index value when modulo 2 is taken instead of forming one ECCE each. That is, 1 ^st ECCE is configured with (EREG # 0, # 2, # 4, # 6, # 8, # 10, # 12, # 14) in the corresponding PRB pair, and (EREG # 1, # 3, # 5, # 7, # 9, # 11, # 13, it is possible to # 15) constituting the 2 ^nd to the ECCE. Based on this, the ECCE indexing method in the corresponding EPDCCH set is also the same as N = 4, and for each ECCE / EREG mapping method, a PRB pair having ^1st ECCE to largest PRB index configured in the PRB pair having the lowest PRB index Up to 2 ^nd ECCE can be indexed by ECCE # 0, ECCE # 1, ...., ECCE # (2M-1), respectively.

Example 3

As a method for maximizing frequency diversity gain, which is an important performance index, in distributed EPDCCH transmission, in Embodiment 3, each ECCE constituting an arbitrary distributed EPDCCH set composed of M EPRBs is It can be transmitted over N distributed EPRBs according to two conditions.

1-1) When N≥M, each ECCE is per EPRB

Each of the EREGs maps N EREGs constituting the ECCE through all M EPRBs (EPRB #m, for m = 0,1,2, ..., M-1).

1-2) When N <M, each ECCE maps N EREGs constituting the ECCE through a total of N distributed EPRBs, one EREG per one EPRB. Here, the corresponding N EPRBs out of M EPRBs constituting the EPDCCH set,

It consists of N EPRBs with an interval of EPRB units.

For example, when two PRB pairs are allocated for a distributed EPDCCH set for a certain EPDCCH terminal in a normal downlink subframe of a normal CP (M = 2), two constituting EPDCCH sets PRB pairs may be indexed into EPRB # 0 and EPRB # 1 in order from the PRB pair having the smaller PRB index. In this case, since the number of EREGs constituting one ECCE in the normal downlink subframe of the corresponding normal CP is 4 (N = 4), 4/2 = 2 in EPRB # 0 according to the above condition 1-1). Each ECE is composed of four EREGs by combining two EREGs and two EREGs in EPRB # 1.

FIG. 11A is an ECCE configuration diagram of a distributed EPDCCH set consisting of two EPRBs according to the third embodiment.

Referring to (a) of FIG. 11, the distributed EPDCCH set includes two PRB pairs of EPRB # 0 and EPRB # 1, and two EREGs in EPRB # 0 according to condition 1-1). In EPRB # 1, two EREGs are combined to form an ECCE with four EREGs.

When eight PRB pairs are allocated for a distributed EPDCCH set for an arbitrary EPDCCH terminal in a normal downlink subframe of a normal CP (M = 8), each of the eight PRB pairs constituting the EPDCCH set has a PRB index. From small PRB pairs, they can be indexed into EPRB # 0, EPRB # 1, ..., and EPRB # 7. In this case as well, since the number of EREGs constituting one ECCE in the normal downlink subframe of the corresponding normal CP is 4 (N = 4),

Each ECCE is constructed by drawing one EREG from each of N = 4 distributed EPRBs having an interval of EPRB units. That is, one ECCE is four EREGs for transmitting the corresponding ECCE to (one EREG in EPRB # 0, one EREG in EPRB # 2, one EREG in EPRB # 4, and one EREG in EPRB # 6). 4 mappings for the transmission of the corresponding ECCE to a mapping or to (1 EREG in EPRB # 1, 1 EREG in EPRB # 3, 1 EREG in EPRB # 5, and 1 EREG in EPRB # 7). Mappings to EREGs can be made.

11 is a configuration diagram of an ECCE in a distributed EPDCCH set consisting of eight EPRBs according to the third embodiment.

Referring to FIG. 11, the distributed EPDCCH set is composed of eight PRB pairs from EPRB # 0 to EPRB # 7, and according to the above conditions 1-2), EPRB # 0, EPRB # 2, EPRB # 4, and EPRB. One EREG is assigned to # 6 to form one ECCE.

Example 4

In order to configure one ECCE in any distributed EPDCCH set, a method of selecting an EREG to be selected in the corresponding EPRB, together with the EPRB mapping method described in Embodiment 3 above, must be defined. In this specification, the combination of an EREG selection method and the EPRB hopping method of Embodiment 3 provides the ECCE / EREG mapping method of the following three embodiments.

Example 4-1

As a first embodiment, according to the third embodiment, the ECCE may be configured with EREGs having the same index from each of the EPRBs mapped to configure one ECCE. That is, in order to configure one ECCE, in the case of 1-1), the respective EPRBs

Two EREGs should be mapped, and in the case of 1-2), one EREG of each EPRB should be mapped. In this case, each ECE may be configured by mapping EREGs having the same index in each EPRB. In this case, the total constituting the corresponding EPDCCH set

ECCEs (ECCE #i, i = 0,1,2, ...,

) May be indexed in order of the lowest EREG index and then the EPRB index, each of which constitutes the corresponding ECCE. That is, according to the EPRB mapping constituting the corresponding ECCE according to the third embodiment, the indexes of the selected EREGs in the EPRB constituting the ECCE are indexed starting from ECCE # 0, starting with the smallest ECCE, and the above 1-2. As in the case of), when the EREG indexes selected from the EPRBs constituting each ECCE among the ECCEs to which different N EPRBs are mapped are the same, indexing may be performed from the ECCE mapped to the smallest EPRB indexes. That is, the EREG constituting ECCE #i constituting the distributed EPDCCH set may be configured by Equations 1 and 2 below.

i = 0,1, ...,

about,

[Equation 1]

N≥M and ECCE #i is {EREG #n of EPRB #m} for m = 0,1, ..., M-1. Where n = n (i), ...,

And n (i) =

to be

[Equation 2]

N <M and ECCE #i is {EREG #n (i) of EPRB #m (a)}. Where m (a) is equal to a = 0,1, ..., N-1

ego,

to be. (Where [x] is the maximum integer not exceeding x)

12 is a configuration diagram of an ECCE in a distributed EPDCCH set according to the embodiment 4-1.

In FIG. 12, the number N of the EREGs constituting the ECCE is 4, and the index i of the ECCE is 0. FIG.

12 (a) is a configuration diagram of the ECCE according to Equation 1, and referring to FIG. 12 (a), the number M of EPRBs constituting the EPDCCH set is 2. Applying the values of these variables to Equation 1, n ( i) = i × N / M = 0 × 4/2 = 0, n (i) + N / M-1 = 1. Therefore, ECCE # 0 becomes {EREG # 0 and EREG # 1 of EPRB # 0 and EPRB # 1}, and EREG # 0 and EREG # 1 are selected from EPRB # 0 and EPRB # as shown in FIG. ECCE # 0 can be configured by selecting EREG # 0 and EREG # 1 from 1.

FIG. 12B is a configuration diagram of the ECCE according to Equation 2, and referring to FIG. 12B, the number M of EPRBs constituting the EPDCCH set is 8. Applying the values of these variables to Equation 2, n (i) = [0 × 4/8] = [0] = 0, m (a) = 8/4 × a + (0mod8 / 4) = 2a + 0 = 2a = {0, 2, 4, 6 for a = 0, 1, 2, 3}. Therefore, ECCE # 0 becomes {EREG # 0 of EPRB # 0, EPRB # 2, EPRB # 4, EPRB # 6}, select EREG # 0 from EPRB # 0, as shown in Figure 12 (b), EPRB ECCE # 0 can be configured by selecting EREG # 0 in # 2, EREG # 0 in EPRB # 4, and EREG # 0 in EPRB # 6.

Example 4-2

As a second embodiment, according to Embodiment 3, the ECCE may be configured with EREGs having a shifted index from the respective EPRBs mapped to configure one ECCE. According to the third embodiment, the hopping size of the EPRB index to select an EREG constituting any ECCE can be regarded as one EPRB in the case of 1-1), and as described above only in the case of 1-2).

EPRBs.

In connection with this embodiment, the present embodiment will be described in detail, starting from the EREG # 0 of EPRB # 0 in M EPRBs of EPRB # 0 to EPRB # (M-1) constituting an arbitrary distributed EPDCCH set. One EREG is selected from each EPRB while hopping the EPRB by the hopping size according to the condition of Example 3. At this time, each time the EPRB is hopped, the EREG index selected from the EPRB is increased by one. However, at this time, when the last largest EPRB constituting the EPDCCH set is reached before mapping the corresponding Nth EREG to configure any ECCE, the cyclic shifting returns to the first EPRB (smallest EPRB). Apply cyclic shifting to continue the EREG mapping.

That is, when the hopping size according to Example 3 is 1 (when N≥M, N = 4 and M is 3), EREG # 0 of EPRB # 0 is selected, and EREG # # in EPRB # 1. Select 1, select EREG # 2 in EPRB # 2, and then select EREG # 3 in EPRB # 0 to select and map N EREGs through a total of N EPRBs (where N> M is In this case, EPRB may be selected in duplicate).

When the first ECCE / EREG mapping consisting of N EREGs is completed, it proceeds to the next EPRB and hops one EPRB of each EPRB, starting with EREG # 0 of EPRB # 1 and hopping the same hopping size. In increments, select a total of N EREGs to map the second ECCE. In this manner, the EREG constituting the Mth ECCE is mapped to the EREG # 0 starting from EPRB # (M-1), which is the last EPRB constituting the EPDCCH set.

As such, when one turn is completed, EREGs of EREG # 0 to EREG # (N-1) of all the EPRBs up to each EPRB # 0 to EPRB # (M-1) constituting the EPDCCH set are completed. It is used to map ECCE up to ECCE # 0 ~ ECCE # (M-1). Then, start again with EREG #N of EPRB # 0 and start the second turn in the same way, starting with EREG #N of EPRB # 0, starting from ECCE #M to ECCE # (2M-1), respectively. Perform EREG mapping.

In this way,

When you turn the turn, all that make up the EPDCCH set

ECCE can be mapped.

The ECCE / EREG mapping method for any distributed EPDCCH set according to the embodiment 4-2 may be represented by Equations 3 and 4 below.

i = 0,1, ...,

about,

[Equation 3]

N≥M and ECCE #i is {EREG #n (a) of EPRB #m (a)}. Where a = 0,1, ..., N-1

ego,

to be. (Where [x] is the maximum integer not exceeding x)

[Equation 4]

N <M and ECCE #i is {EREG #n (a) of EPRB #m (a)}. Where a = 0, 1, ..., for N-1,

ego,

(Where [x] is the maximum integer not exceeding x)

13 is a configuration diagram of an ECCE in a distributed EPDCCH set according to the embodiment 4-2.

In FIG. 13, the number N of EREGs constituting the ECCE is 4, and the index i of the ECCE is 0. FIG.

FIG. 13A is a configuration diagram of an ECCE according to Equation 3, and referring to FIG. 13A, the number M of EPRBs constituting the EPDCCH set is 2. FIG. Applying the values of these variables to Equation 3 above, for a = 0, m (0) = 0, n (0) = 0, and for a = 1, m (1) = 1, n (1 ) = 1, for a = 2, m (2) = 0, n (2) = 2, and for a = 3, m (3) = 1 and n (a) = 3. Therefore, ECCE # 0 becomes {EREG # 0 of EPRB # 0, EREG # 1 of EPRB # 1, EREG # 2 of EPRB # 0, EREG # 3 of EPRB # 1}, as shown in FIG. Configure ECCE # 0 by selecting EREG # 0 in EPRB # 0, EREG # 1 in EPRB # 1, EREG # 2 in EPRB # 0, and EREG # 3 in EPRB # 1 again. can do.

FIG. 13B is a configuration diagram of the ECCE according to Equation 4, and referring to FIG. 13B, the number M of EPRBs constituting the EPDCCH set is 8. Applying the values of these variables to Equation 4 above, for a = 0, m (0) = 0, n (0) = 0, and for a = 1, m (1) = 2, n (1 ) = 1, for a = 2, m (2) = 4, n (2) = 2, and for a = 3, m (3) = 6 and n (a) = 3. Therefore, ECCE # 0 becomes {EREG # 0 of EPRB # 0, EREG # 1 of EPRB # 2, EREG # 2 of EPRB # 4, EREG # 3 of EPRB # 6}, as shown in FIG. 13 (b). You can configure ECCE # 0 by selecting EREG # 0 in EPRB # 0, EREG # 1 in EPRB # 2, EREG # 2 in EPRB # 4, and EREG # 3 in EPRB # 6. have.

Example 4-3

Similar to Example 4-2, while selecting a total of N EREGs by one EREG while hopping the EPRB, unlike Example 4-2, the EREG is selected by increasing the index by 1 for each EPRB hopping. Not according to the above N value

It can be selected and mapped while increasing the EREG index. That is, in the M EPRBs of EPRB # 0 to EPRB # (M-1) constituting an arbitrary distributed EPDCCH set, the EPRB is hopped by the hopping size according to the hopping size according to the third embodiment, starting with EREG # 0 of EPRB # 0. Select one EREG from each EPRB.

At this time, each time the EPRB is hopped, the EREG index selected from the EPRB is not increased by 1 as in the above embodiment 4-2, but according to the N value.

Increase it. For example, when the number of EPRBs allocated for any distributed EPDCCH set is 8 (M = 8) and the corresponding EPDCCH set is defined in the normal downlink subframe of the normal CP (that is, N = 4). ), The EPRB hopping size may be determined as M / N = 2 according to the condition of Example 3 above. In addition, when configuring the ECCE according to the present embodiment 4-3, the EREG hopping size selected from the EPRBs constituting each ECCE is determined to be 16/4 = 4.

Accordingly, the first ECCE (ECCE # 0) constituting the EPDCCH set is composed of EREG # 0 of EPRB # 0, EREG # 4 of EPRB # 2, EREG # 8 of EPRB # 4, and EREG # 12 of EPRB # 6. do. Similarly, the second ECCE index is composed of EREG # 0 of EPRB # 1, EREG # 4 of EPRB # 3, EREG # 8 of EPRB # 5, and EREG # 12 of EPRB # 7. In this way, ECCE # (M-1), which is the last ECCE of the first turn and the Mth ECCE of the EPDCCH set (in this example, ECCE # 7), is equivalent to EREG # 0 and EPRB # 1 of EPRB # 7. EREG # 4, EREG # 8 of EPRB # 3 and EREG # 12 of EPRB # 5.

As such, when one turn is completed, the modulo of all the EPRBs up to each EPRB # 0 to EPRB # (M-1) constituting the corresponding EPDCCH set.

That is, in this example, all EREGs having indices where modulo 4 is zero are used to map M (8 in this example) ECCEs up to respective ECCE # 0 to ECCE # (M-1).

ECCE #M, which is the (M + 1) th ECCE, that constitutes the ECCE in the same way, is set in the same way. Mapping is via EREG # 13 at 6, and the second ECCE ECCE # (2M-1) is mapped to EREG # 1 at EPRB # 7, EREG # 5 at EPRB # 1, EREG # 9 at EPRB # 3, and EPRB # Termination by mapping via EREG # 13 of 5.

In this way,

After turning the turn, all that make up the EPDCCH set

ECCE can be mapped. However, at this time, when the last largest EPRB constituting the EPDCCH set is reached before mapping the corresponding Nth EREG to configure any ECCE, the cyclic shifting returns to the first EPRB (smallest EPRB). Apply cyclic shifting to continue the EREG mapping.

The ECCE / EREG mapping method for any distributed EPDCCH set according to the present embodiment 4-3 may be represented by Equations 5 and 6 below.

i = 0,1, ...,

about,

[Equation 5]

N≥M and ECCE #i is {EREG #n (a) of EPRB #m (a)}. Where a = 0,1, ..., N-1,

ego,

to be. (Where [x] is the maximum integer not exceeding x)

[Equation 6]

N <M and ECCE #i is {EREG #n (a) of EPRB #m (a)}. Where a = 0,1, ..., N-1

ego,

to be. (Where [x] is the maximum integer not exceeding x)

14 is a configuration diagram of an ECCE in a distributed EPDCCH set according to the embodiment 4-3.

In FIG. 14, the number N of EREGs constituting the ECCE is 4, and the index i of the ECCE is 0. FIG.

FIG. 14A illustrates a configuration of ECCE according to Equation 5. Referring to FIG. 14A, the number M of EPRBs constituting the EPDCCH set is 2. FIG. Applying the values of these variables to Equation 5 above, for a = 0, m (0) = 0, n (0) = 0, and for a = 1, m (1) = 1, n (1 ) = 4, for a = 2, m (2) = 0, n (2) = 8, and for a = 3, m (3) = 1 and n (a) = 12. Therefore, ECCE # 0 becomes {EREG # 0 of EPRB # 0, EREG # 4 of EPRB # 1, EREG # 8 of EPRB # 0, EREG # 12 of EPRB # 1}, as shown in FIG. Configure ECCE # 0 by selecting EREG # 0 in EPRB # 0, EREG # 4 in EPRB # 1, EREG # 8 in EPRB # 0, and EREG # 12 in EPRB # 1 again. can do.

FIG. 14B is a configuration diagram of the ECCE according to Equation 6, and referring to FIG. 14B, the number M of EPRBs constituting the EPDCCH set is 8. Applying the values of these variables to Equation 6 above, for a = 0, m (0) = 0, n (0) = 0, and for a = 1, m (1) = 2, n (1 ) = 4, for a = 2, m (2) = 4, n (2) = 8, and for a = 3, m (3) = 6 and n (a) = 12. Therefore, ECCE # 0 becomes {EREG # 0 of EPRB # 0, EREG # 4 of EPRB # 2, EREG # 8 of EPRB # 4, EREG # 12 of EPRB # 6}, as shown in FIG. You can configure ECCE # 0 by selecting EREG # 0 in EPRB # 0, EREG # 4 in EPRB # 2, EREG # 8 in EPRB # 4, and EREG # 12 in EPRB # 6. have.

As described above, there are REs that cannot be used due to a reference signal such as a PDCCH control region or a CRS among the REs constituting the EREG, and thus an imbalance in the number of REs that can be used among the EREGs may occur. The number of available REs of the ECCEs according to the embodiments 4-2 and 4-3 will be described.

Let legacy PDCCH have a size of 2. When the size of the legacy PDCCH is 2, the usable RE number is summarized in Table 3.

In this case, Example 4-2 configures ECCE while increasing the index of EREG by one. A summary of the number of available REs of ECCEs according to Example 4-2 is shown in Table 10 below.

TABLE 10

Referring to Table 10, there are 25 available REs of ECCEs consisting of EREGs of EREG # 0 to EREG # 3 for one transmit antenna port (1 Tx CRS), and EREGs of EREG # 12 to EREG # 15. The number of usable REs of the configured ECCE is 31, resulting in a difference of 6 usable REs from each other.

Similarly, the usable RE number of ECCEs according to the embodiment 4-3 when the size of the legacy PDCCH is 2 will be described.

TABLE 11

Referring to Table 11, there are 28 usable REs consisting of EREG # 0, EREG # 4, EREG # 8, and EREG # 12 for one transmit antenna port (1 Tx CRS), and EREG # 1, EREG #. The number of usable REs of the ECCE composed of 5, EREG # 9, and EREG # 13 is 29, and there is a difference in the number of usable REs from each other. This is smaller than the difference in the number of available REs between ECCEs according to the embodiment 4-2. In addition, the ECCEs according to the embodiment 4-3 do not show a difference in the number of usable REs between the ECCEs for the two transmit antenna ports (2 Tx CRS) and the four transmit antenna ports (4 Tx CRS).

In the fourth embodiment has been described embodiments combining the third embodiment, the present invention is not limited thereto, and the embodiments described in the fourth embodiment may be independent of the third embodiment.

For example, according to the embodiment 4-1, ECCEs may be configured with EREGs having the same index, and in the case of an EPDCCH set including 8 EPRBs, EPRB # 0, EPRB # 2, EPRB # 4, and EPRB # 6. In EREG (eg, EREG corresponding to EREG # 0) of the same index may be configured as one ECCE. However, Example 4-1 may be independent of Example 3, in which case, for example, the same index in four EPRBs of consecutive indexes of EPRB # 0, EPRB # 1, EPRB # 2, and EPRB # 3. An EREG (eg, an EREG corresponding to EREG # 0) may be configured as one ECCE.

Another example of Example 4, which is independent of Example 3, is given. According to the embodiment 4-2, an ECCE may be configured with EREGs (eg, EREG # 0, EREG # 1, EREG # 2, and EREG # 3) of consecutive indexes, and the EPDCCH set including two EPRBs may be configured. Select EREG # 0 from EPRB # 0, select EREG # 1 from EPRB # 1, select EREG # 2 from EPRB # 0 again, and select EREG # 3 from EPRB # 1 again. Can be configured. However, Example 4-2 may be independent of Example 3, in this case, for example, select EREG # 0 in EPRB # 0 and select EREG # 1, EREG # 2, EREG # 3 in EPRB # 1. Can configure one ECCE.

Similarly to Example 4-3, the ECCE may be configured by selecting EREG while increasing the index by 16 / N without hopping the EPRB independently of Example 3. For example, one ECCE may be configured by selecting EREG # 0, EREG # 4, and EREG # 8 in EPRB # 0 and EREG # 12 in EPRB # 1 in an EPDCCH set consisting of two EPRBs.

Example 3 and Example 4 provide an ECCE / EREG mapping method in any distributed EPDCCH set, and the ECCE / EREG mapping function of Example 4-1 is defined by Equations 1 and 2 below. The ECCE / EREG mapping function according to Example 4-2 was defined by Equations 3 and 4, and the ECCE / EREG mapping function of Example 4-3 was defined by Equations 5 and 6. . However, Equations 1 to 6 are examples of function expressions reflecting the respective embodiments, and other forms of functional formulas incorporating the concepts of Embodiments 4-1, 4-2, and 4-3 are provided. It may be.

15 is a flowchart illustrating a method for transmitting control information of a transmission / reception point according to an embodiment of the present invention.

Referring to FIG. 15, a transmission / reception point for transmitting control information to a UE through data regions of resource block pairs of a subframe may include at least one centralized type for resource block pairs of some of the resource block pairs. A localized downlink control channel set is configured and at least one distributed downlink control channel set is configured for resource block pairs of other portions of the resource block pairs (S1510).

And, the transmitting and receiving point is the resource element group (enhanced Resoure Element Group) consisting of the resource elements having the same index for the resource element (index) is assigned to repeat the 16 numbers in each of the resource block pairs frequency-first The control channel elements are allocated to four resource element groups of different indices having the same dividing by four or eight resource element groups of different indices having the same dividing by two (S1520).

In step S1520, the resource element groups constituting the control channel element in the centralized downlink control channel set are located in one resource block pair and the resource element groups constituting the control channel element in the distributed downlink control channel set are two or more resources. It is located in a block pair.

An example of an index assigned to a resource block pair (PRB pair) may refer to the foregoing description with reference to FIGS. 4 to 9. 4 and 7, the EREG is indexed in a frequency-prioritized manner to numbers from 0 to 15. In the embodiment shown in FIG. 4, index 12 of the second symbol is indexed at index 11 of the first symbol by indexing with a symbol reference cyclic shift. In the embodiment shown in FIG. 7, the second symbol is indexed without the symbol reference cyclic shift. Is not indexed adjacent to index 11 of the first symbol.

The transmission / reception point may allocate ECCEs to EREGs corresponding to different indices divided by four among EREGs or EREGs corresponding to different indices divided by two.

For example, EREGs # 0, # 4, # 8, and # 12 may constitute one ECCE for allocating ECCEs with EREGs corresponding to different indices divided by 4, and EREG # 1. Another one with ECCE, EREG # 2, # 6, # 10, # 14, another with # 5, # 9, # 13, another with ECCE, EREG # 3, # 7, # 11, # 15 ECCE can be configured.

As another example, EREGs # 0, # 2, # 4, # 6, # 8, # 10, # 12, and # 14 may be assigned to assigning ECCEs to EREGs corresponding to different indices divided by two. One ECCE may be configured, and EREGs # 1, # 3, # 5, # 7, # 9, # 11, # 13, and # 15 may configure another ECCE.

The transmitting / receiving point may allocate ECCE by distributing EREGs to resource block pairs so that a frequency diversity gain is maximized at step S1520 of allocating control channel elements to a distributed downlink control channel set. Content described in Example 3 may be one of these methods.

Referring to FIG. 11 again, the transmit / receive point hops two PRBs from EPRB # 0 in eight PRB pairs, and selects EREGs from EPRB # 2, EPRB # 4, and EPRB # 6, respectively, and allocates ECCE. The transmit / receive point may allocate ECCE to EREGs corresponding to different indices divided by 4 as described above in the PRB pairs (EPRB # 0, EPRB # 2, EPRB # 4, and EPRB # 6). Alternatively, ECCEs may be allocated to EREGs corresponding to different indices having a remainder divided by two.

More specifically, you can configure ECCE by selecting EREG # 0 in EPRB # 0, EREG # 4 in EPRB # 2, EREG # 8 in EPRB # 4, and EREG # 12 in EPRB # 6. Can be. As another example, you can configure ECCE by selecting EREG # 12 in EPRB # 0, EREG # 8 in EPRB # 2, EREG # 4 in EPRB # 4, and EREG # 0 in EPRB # 6. Can be.

When the index of the EREG is limited to 0 to 15, the combination of EREGs corresponding to different indices divided by 4 or the combination of EREGs corresponding to different indices divided by 2 may be limited. Looking at these combinations, the indexes of EREGs assigned to ECCE are {0,4,8,12}, {1,5,9,13}, {2,6,10,14} and {3,7,11 , 15} or one of {0,2,4,6,8,10,12,14} and {1,3,5,7,9,11,13,15}.

15, the transmission / reception point transmits control information to the terminal through at least one control channel element among the control channel elements (S1530).

The control information may be transmitted through an EPDCCH, which is a control channel transmitted in the data region 220, and the EPDCCH is allocated to the at least one control channel element in a resource block pair.

16 is a flowchart illustrating a method for receiving control information of a terminal according to another embodiment of the present invention.

Referring to FIG. 16, a terminal receiving control information from a transmission / reception point through data areas of resource block pairs (Physical Resource Block pairs) of a subframe includes:

The remainder of each of the resource block pairs divided by 4 of the Enhanced Resoure Groups consisting of resource elements having the same index for the Resource Elements that are repeated in the frequency-first order of 16 numbers Receives a radio signal through at least one control channel element among control channel elements allocated to four resource element groups of the same different index or divided by two and eight resource element groups of the same different index ( S1610). In operation S1620, the terminal may acquire control information from the received radio signal.

At least one localized enhanced physical downlink control channel set is configured for resource block pairs of some of the resource block pairs, and at least one resource block pair for other portions of the resource block pairs. A distributed downlink control channel set is configured, and in step S1610, the resource element groups constituting the control channel element in the centralized downlink control channel set are located in one resource block pair and the distributed downlink control channel Resource element groups constituting control channel elements in the set are located in two or more resource block pairs.

An example of an index assigned to a resource block pair (PRB pair) may refer to the foregoing description with reference to FIGS. 4 to 9. 4 and 7, the EREG is indexed in a frequency-prioritized manner to numbers from 0 to 15. In the embodiment shown in FIG. 4, index 12 of the second symbol is indexed at index 11 of the first symbol by indexing with a symbol reference cyclic shift. In the embodiment shown in FIG. 7, the second symbol is indexed without the symbol reference cyclic shift. Is not indexed adjacent to index 11 of the first symbol.

EREGs whose remainders divided by four of the EREGs correspond to the same different indexes, or EREGs whose remainders divided by 2, which correspond to the same different indexes may be allocated to form an ECCE.

For example, EREGs # 0, # 4, # 8, and # 12 may constitute one ECCE for allocating ECCEs with EREGs corresponding to different indices divided by 4, and EREG # 1. Another one with ECCE, EREG # 2, # 6, # 10, # 14, another with # 5, # 9, # 13, another with ECCE, EREG # 3, # 7, # 11, # 15 ECCE can be configured.

As another example, EREGs # 0, # 2, # 4, # 6, # 8, # 10, # 12, and # 14 may be assigned to assigning ECCEs to EREGs corresponding to different indices divided by two. One ECCE may be configured, and EREGs # 1, # 3, # 5, # 7, # 9, # 11, # 13, and # 15 may configure another ECCE.

Control channel elements allocated to the distributed downlink control channel set may be allocated to resource block pairs so as to maximize frequency diversity gain. Content described in Example 3 may be one of these methods.

Referring back to FIG. 11, EREGs are selected from EPRB # 2, EPRB # 4, and EPRB # 6 while hopping by two PRBs from EPRB # 0 in eight PRB pairs to configure ECCE. In such a PRB pair (EPRB # 0, EPRB # 2, EPRB # 4, EPRB # 6), ECCE may be allocated to EREGs corresponding to different indices divided by 4 as described above, or 2 ECCE may be allocated to EREGs corresponding to different indices divided by.

More specifically, EREG # 0 is selected in EPRB # 0, EREG # 4 is selected in EPRB # 2, EREG # 8 is selected in EPRB # 4, EREG # 12 is selected in EPRB # 6, and ECCE is configured. Can be. As another example, EREG # 12 is selected in EPRB # 0, EREG # 8 is selected in EPRB # 2, EREG # 4 is selected in EPRB # 4, and EREG # 0 is selected in EPRB # 6 to configure ECCE. Can be.

When the index of the EREG is limited to 0 to 15, the combination of EREGs corresponding to different indices divided by 4 or the combination of EREGs corresponding to different indices divided by 2 may be limited. Looking at these combinations, the indexes of EREGs assigned to ECCE are {0,4,8,12}, {1,5,9,13}, {2,6,10,14} and {3,7,11 , 15} or one of {0,2,4,6,8,10,12,14} and {1,3,5,7,9,11,13,15}.

17 is a diagram showing the configuration of a transmission and reception point according to another embodiment of the present invention.

Referring to FIG. 17, a transmission / reception point 1700 that transmits control information to a terminal through data regions of resource block pairs of a subframe includes a control unit 1710, a transmitter 1720, and a receiver 1730. And the like.

The controller 1710 configures at least one localized downlink physical downlink control channel set for the resource block pairs of some of the resource block pairs, and applies the resource block pairs of the other part of the resource block pairs to each other. At least one distributed downlink control channel set is configured with respect to each of the resource block pairs, and the resource elements having the same index with respect to the resource elements that are indexed by repeating 16 numbers in each of the resource block pairs with frequency priority. The control channel is composed of four resource element groups of 4 different indexes with the remainder divided by 4 among the enhanced Resoure Element Groups consisting of 4 or 8 resource element groups of the same index with the remainder divided by 2 Allocate elements.

The controller 1710 controls the resource element groups constituting the control channel element in the centralized downlink control channel set to be located in one resource block pair, and the resource element group constituting the control channel element in the distributed downlink control channel set. Control to be located in two or more resource block pairs.

When the index of the EREG is limited to 0 to 15, the combination of EREGs corresponding to different indices divided by 4 or the combination of EREGs corresponding to different indices divided by 2 may be limited. Looking at these combinations, the indexes of EREGs assigned to ECCE are {0,4,8,12}, {1,5,9,13}, {2,6,10,14} and {3,7,11 , 15} or one of {0,2,4,6,8,10,12,14} and {1,3,5,7,9,11,13,15}.

In addition, the control unit 1710 controls the operation of the overall transmission and reception point according to the ECCE / EREG mapping method for the EPDCCH transmission and the ECCE indexing in any centralized and distributed EPDCCH set necessary to carry out the above-described present invention.

The transmitter 1720 transmits control information to the terminal through at least one control channel element among the control channel elements.

The transmitter 1720 and the receiver 1730 are used to transmit and receive signals, messages, data, and information necessary for carrying out the present invention.

18 is a diagram illustrating a configuration of a terminal according to another embodiment of the present invention.

Referring to FIG. 18, a terminal 1800 that receives control information from a transmission / reception point through data areas of resource block pairs of a subframe includes a receiver 1810, a controller 1820, and a transmitter 1830. And the like.

The receiving unit 1810 repeats 16 numbers in each of the resource block pairs in frequency-first order, and among the enhanced element groups (enhanced resource groups) having resource elements having the same indexes for the resource elements assigned the indexes. Wireless over at least one control channel element of control channel elements allocated to four resource element groups of different indices having the same dividing divided by four, or eight resource element groups of the same dividing index divided by two. Receive the signal.

Here, at least one localized enhanced physical downlink control channel set is configured for resource block pairs of some of the resource block pairs, and at least one resource block pair of another part of the resource block pairs. A distributed downlink control channel set is configured, and the resource element groups constituting the control channel element in the centralized downlink control channel set are located in one resource block pair and controlled in the distributed downlink control channel set. Resource element groups constituting the channel element are located in two or more resource block pairs.

When the index of the EREG is limited to 0 to 15, the combination of EREGs corresponding to different indices divided by 4 or the combination of EREGs corresponding to different indices divided by 2 may be limited. Looking at these combinations, the indexes of EREGs assigned to ECCE are {0,4,8,12}, {1,5,9,13}, {2,6,10,14} and {3,7,11 , 15} or one of {0,2,4,6,8,10,12,14} and {1,3,5,7,9,11,13,15}.

The controller 1820 acquires control information from the radio signal received by the receiver 1810. In addition, the controller 1820 controls the overall operation of the UE according to the ECCE / EREG mapping method for receiving the EPDCCH necessary for carrying out the above-described present invention and the ECCE indexing in any centralized and distributed EPDCCH set.

The transmitter 1830 and the receiver 1810 are used to transmit and receive signals, messages, data, and information necessary for carrying out the above-described present invention.

The contents related to the standard mentioned in the above embodiments are omitted to simplify the description of the specification and constitute a part of the present specification. Accordingly, the addition of a part of the contents related to the above standard specification or the description in the claims should be interpreted as falling within the scope of the present invention.

Specifically, the following documents, which are attached below, form a part of this specification as part of already published documents. Therefore, the addition of the contents of the standard and part of the standard documents to the specification or the description in the claims should be construed as falling within the scope of the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

CROSS-REFERENCE TO RELATED APPLICATION

This patent application is filed with Korea Patent Application No. 10-2012-0102452 filed on September 14, 2012 and Korea Patent Application No. 10-2012-0103584 filed on September 18, 2012 and October 2012 Patent application No. 10-2012-0111501 filed with Korea on 08 08 and Patent application No. 10-2012-0144531 filed with Korea on 12 December 2012 and patent application No. 10-2012-0144531 filed with Korea on December 13, 2012 Priority No. 10-2012-0145368 is issued pursuant to US § 119 (a) (35 USC § 119 (a)), all of which is hereby incorporated by reference in this patent application. In addition, if this patent application claims priority for the same reason for countries other than the United States, all its contents are incorporated into this patent application by reference.

Claims (16)

1. In a method of transmitting control information of a transmission / reception point for transmitting control information to a terminal through data regions of resource block pairs (Physical Resource Block pairs) of a subframe,

   Configure at least one localized Enhanced Physical Downlink Control Channel set for resource block pairs of some of the resource block pairs and at least one resource block pair for another portion of the resource block pairs Configuring a distributed downlink control channel set of a;

   16 numbers in each of the pairs of resource blocks are divided by four of the enhanced resource element groups composed of resource elements having the same index with respect to the resource elements having the same index. Allocating control channel elements to four resource element groups of different indices having the same index, or dividing by two, to eight resource element groups of different indices, wherein the control is performed in the centralized downlink control channel set. The resource element groups constituting the channel element are located in one resource block pair and the resource element groups constituting the control channel element in the distributed downlink control channel set are located in two or more resource block pairs; And

   And transmitting control information to the terminal through at least one control channel element among the control channel elements.
2. The method of claim 1,

   Allocating control channel elements to the distributed downlink control channel set,

   And allocating the control channel elements by distributing the resource element groups to the resource block pairs so that a frequency diversity gain is maximized.
3. The method of claim 1,

   The indexes of the resource element groups allocated to the control channel elements are {0,4,8,12}, {1,5,9,13}, {2,6,10,14} and {3,7, Control information transmission method of a transmission and reception point, characterized in that.
4. The method of claim 1,

   The indexes of the resource element groups allocated to the control channel elements are {0,2,4,6,8,10,12,14} and {1,3,5,7,9,11,13,15}, respectively. Control information transmission method of a transmission and reception point characterized in that.
5. A method of receiving control information of a terminal for receiving control information from a transmission / reception point through a data region of physical resource block pairs of a subframe,

   16 numbers in each of the pairs of resource blocks are divided by four of the enhanced resource groups composed of resource elements having the same index with respect to the resource elements having the same index. Receives a radio signal through at least one control channel element among control channel elements allocated to four resource element groups of the same different index or divided by two, and the other divided by eight resource element groups of the same different index. At least one localized downlink physical downlink control channel set is configured for the resource block pairs of some of the resource block pairs, and the resource block pairs of the other part of the resource block pairs At least one distributed downlink control channel set is configured for the Resource element groups constituting the control channel element in a downlink control channel set are located in one resource block pair and resource element groups constituting the control channel element in the distributed downlink control channel set are assigned to two or more resource block pairs. Located; And

   And receiving the control information from the radio signal.
6. The method of claim 5,

   Control channel elements allocated to the distributed downlink control channel set are allocated by distributing the resource element groups to the resource block pairs so as to maximize a frequency diversity gain. Receive method.
7. The method of claim 5,

   The indexes of the resource element groups allocated to the control channel elements are {0,4,8,12}, {1,5,9,13}, {2,6,10,14} and {3,7, 11, 15} method for receiving control information of a terminal, characterized in that.
8. The method of claim 5,

   The indexes of the resource element groups allocated to the control channel elements are {0,2,4,6,8,10,12,14} and {1,3,5,7,9,11,13,15}, respectively. Method of receiving control information of a terminal, characterized in that.
9. A transmission / reception point for transmitting control information to a terminal through data areas of resource block pairs (Physical Resource Block pairs) of a subframe,

   Configure at least one localized Enhanced Physical Downlink Control Channel set for resource block pairs of some of the resource block pairs and at least one resource block pair for another portion of the resource block pairs A distributed downlink control channel set is configured, and each of the resource block pairs has resource elements having the same index with respect to resource elements that are indexed by repeating 16 numbers in frequency-first order. The control channel elements are divided into four resource element groups of 4 different indexes, the remainder of which is divided by 4 of the enhanced resource element groups, or 8 resource element groups of different indexes, which are divided by 2. Control unit for allocating-configuring the control channel element in the centralized downlink control channel set Source element group's in the resource element groups are two or more RB pairs located in one resource block pair configuring the control channel element in the Scatter downlink control channel set; And

   And a transmitter for transmitting control information to the terminal through at least one control channel element among the control channel elements.
10. The method of claim 9,

    The control unit,

    And in the distributed downlink control channel set, allocating the control channel elements by distributing the resource element groups to the resource block pairs so that a frequency diversity gain is maximized.
11. The method of claim 9,

    The indexes of the resource element groups allocated to the control channel elements are {0,4,8,12}, {1,5,9,13}, {2,6,10,14} and {3,7, 11, 15} transmission and reception point, characterized in that.
12. The method of claim 9,

    The indexes of the resource element groups allocated to the control channel elements are {0,2,4,6,8,10,12,14} and {1,3,5,7,9,11,13,15}, respectively. Transmission point characterized in that.
13. A terminal for receiving control information from a transmission / reception point through data areas of resource block pairs (Physical Resource Block pairs) of a subframe,

    16 numbers in each of the pairs of resource blocks are divided by four of the enhanced resource groups composed of resource elements having the same index with respect to the resource elements having the same index. Receives a radio signal through at least one control channel element among control channel elements allocated to four resource element groups of the same different index or divided by two, and the other divided by eight resource element groups of the same different index. A receiver is configured with at least one localized Enhanced Physical Downlink Control Channel set for resource block pairs of some of the resource block pairs, and includes resource block pairs of other portions of the resource block pairs. At least one distributed downlink control channel set is configured for the The resource element groups constituting the control channel element in the downlink control channel set are located in one resource block pair, and the resource element groups constituting the control channel element in the distributed downlink control channel set are two or more resource block pairs. Located in-; And

    And a control unit for obtaining the control information from the radio signal.
14. The method of claim 13,

    The control channel elements allocated to the distributed downlink control channel set are allocated by distributing the resource element groups to the resource block pairs so that a frequency diversity gain is maximized.
15. The method of claim 13,

    The indexes of the resource element groups allocated to the control channel elements are {0,4,8,12}, {1,5,9,13}, {2,6,10,14} and {3,7, 11,15}.
16. The method of claim 13,

    The indexes of the resource element groups allocated to the control channel elements are {0,2,4,6,8,10,12,14} and {1,3,5,7,9,11,13,15}, respectively. Terminal characterized in that the.

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