KR20140036927A - Method for transmitting control information, transmission/reception point thereof, method for receiving control information and terminal thereof - Google Patents

Abstract

The present invention relates to a method for transmitting control information of a transmission and reception point for a terminal receiving downlink control information through a downlink control channel which is introduced into a data area, a method for receiving control information of the terminal, and devices thereof. Provided are a resource mapping method and device for an enhanced control channel element (ECCE) of an enhanced physical downlink control channel (EPDCCH).

Description

Method of transmitting control information of a transmission and reception point, a transmission and reception point thereof, a method of receiving control information of a terminal, and a terminal thereof

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. It also provides a method and apparatus for indexing ECCE in any distributed Enhanced Physical Downlink Control Channel (EPDCCH) set.

The present invention provides a method of transmitting control information of a transmission / reception point for transmitting control information to a terminal through a data region of two or more resource block pairs in a subframe, wherein each of the resource block pairs has a frequency priority of 16 numbers. Four resource element groups with different indexes divided by 4 out of the enhanced resource element groups composed of resource elements having the same index with respect to the resource elements repeatedly given the index. Allocating control channel elements to eight resource element groups of different indices, each of which is divided by 2 or 2, wherein the resource element groups constituting the control channel element are located in at least two 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 relates to a method for receiving control information of a terminal that receives control information from a transmission / reception point through a data region of two or more resource block pairs in a subframe, wherein each of the resource block pairs has a frequency priority of 16 numbers. Four resource element groups of different indexes having the same dividing by 4 among the enhanced resource groups composed of resource elements having the same index with respect to resource elements repeatedly given an index. Or receiving a radio signal through at least one control channel element among control channel elements allocated to eight resource element groups having different indexes divided by two, the resource element group constituting the control channel element. Are located in two or more resource block pairs; And obtaining the control information from the radio signal.

The present invention is a transmission / reception point for transmitting control information to a terminal through a data region of two or more resource block pairs in a subframe, and in each of the resource block pairs, 16 numbers are repeated in frequency priority order. The remainder divided by 4 of the enhanced Resource Element Groups of resource elements having the same index for the assigned Resource Elements is divided into 4 resource element groups or 2 of the same different index. A control unit for allocating control channel elements to eight resource element groups of the same different index, the remaining resource element groups constituting the control channel element being located in two or more 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 provides a terminal for receiving control information from a transmission / reception point through a data region of two or more resource block pairs in a subframe, and repeating 16 numbers in each of the resource block pairs with frequency priority. The remainder divided by 4 of the enhanced Resource Groups composed of resource elements having the same index for the assigned Resource Elements is divided into 4 resource element groups of the same different index or divided by 2 Receiving unit for 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-Resource element groups constituting the control channel element is two or more resource blocks Located in 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.
4 illustrates an example of resource element (RE) mapping of a PRB (Physical Resource Block) pair EREG indexed with 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 configuration diagram of an ECCE in a distributed EPDCCH set composed of two EPRBs according to the first embodiment.
11 is a configuration diagram of an ECCE in a distributed EPDCCH set consisting of eight EPRBs according to the first embodiment.
12 is a configuration diagram of an ECCE in a distributed EPDCCH set according to the embodiment 2-1.
13 is a configuration diagram of an ECCE in a distributed EPDCCH set according to the embodiment 2-2.
14 is a configuration diagram of an ECCE in a distributed EPDCCH set according to the embodiment 2-3.
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 with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

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 generic concept meaning a terminal in wireless communication. In addition, user equipment (UE) in WCDMA, LTE, and HSPA, as well as mobile station (MS) in GSM, user terminal (UT), and SS 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 are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes 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- Can be used. An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.

A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

In systems such as LTE and LTE-A, the uplink and downlink are configured on the basis of one carrier or carrier pair to form a standard. The uplink and downlink transmit control information through a control channel such as a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel (PHICH), a Physical Uplink Control CHannel And a data channel such as a Physical Downlink Shared CHannel (PDSCH), a Physical Uplink Shared CHannel (PUSCH), and the like.

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 UEs. The eNB includes a physical downlink shared channel (PDSCH) as a main physical channel for unicast transmission, downlink control information such as scheduling required for reception of a PDSCH, A physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in a Physical Uplink Shared Channel (PUSCH). Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

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, a basic unit of data transmission is a subframe unit, and downlink or uplink scheduling is performed in units of subframes. 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.

A Resource Element (RE) can be composed 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). A basic unit of the PDCCH transmission for an arbitrary terminal is a control channel element (CCE), and one CCE is composed of nine resource element groups (REG). One REG includes REs excluding REs (Resource Elements) to which PCFICH and PHICH, which are other physical channels existing in the PDCCH region of the DL subframe, and a cell-specific reference signal (CRS) For example, by grouping four consecutive REs on the frequency axis.

An EREG (Enhanced REG) / ECCE (Enhanced CCE) may be introduced into the EPDCCH corresponding to the concept of REG and CCE of the conventional PDCCH for EPDCCH transmission resource mapping for an arbitrary terminal.

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. While M can be 2, 4, 8, 16 in the decentralized 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 = 1) EPDCCH sets may be allocated to one UE. Since each EPDCCH set is distributed or centralized type, KL centralized type EPDCCH and KD distributed for one UE. EPDCCH of type can be allocated. That is, KL + KD = K can be obtained.

According to the newly introduced EREG / ECCE, not only a frame structure type, a subframe configuration, a CP (Cyclic Prefix) length but also a legacy PDCCH control are set for one PRB pair constituting each EPDCCH set A total of 16 EREGs from EREG # 0 to EREG # 15 are configured in the corresponding PRB pair irrespective of whether or not the reference signal (for example, CRS, CSI-RS, PRS, etc.) can do.

Specifically, for a normal CP for one PRB pair constituting an arbitrary EPDCCH set, 16 numbers are allocated to 144 REs excluding 24 REs for a DM-RS among a total of 12 x 14 = 168 REs. EREG indexing can be done from 0 to 15 in frequency first and then time manner. Likewise, in the case of the extended CP, for the 128 REs except for the 16 REs for the DM-RS out of the 12 x 12 = 144 REs constituting one PRB pair, 16 numbers are allocated in the frequency first and then time manner, the EREG can be indexed 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. 3 to 8 below. However, in Figs. 3 to 8 below, portions indicated by hatches and not indicated by numbers indicate REs used for DM-RS, and portions indicated by numbers indicated by grids or hatched and indicated by REs to which CRSs are transmitted. 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). .

7 to 9 are CRSs 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 are allocated from EREG # 0 to EREG # 15 for 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.

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

First, N = 4 may be set for 3, 4 and 8 of the special subframes corresponding to the normal subframe and the normal CP corresponding to the normal CP. That is, in this case, a total of 4 ECCEs can be constituted by four EREGs for 16 EREGs constituting one PRB pair.

In other cases, 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, 5 and 6, N = 8. In this case, a total of 2 ECCEs can be constituted by eight EREGs for 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.

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

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.

Specifically, the present invention provides a method for configuring each ECCE in M PRB pairs constituting a distributed type EPDCCH set 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.

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 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 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 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 consideration of this, 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 ]

As a method for maximizing frequency diversity gain, which is an important performance index, in distributed EPDCCH transmission, in Embodiment 1, each of the ECCEs constituting a random distributed EPDCCH set composed of M EPRBs is It can be transmitted over N distributed EPRBs according to two conditions.

개의 EREGs 씩, 모든 M개의 EPRB(EPRB #m, for m=0,1,2,...,M-1)를 통해 해당 ECCE를 구성하는 N개의 EREG들을 매핑한다.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).

EPRB 단위의 간격을 가지는 N개의 EPRB들로 구성된다.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 the corresponding EPDCCH set 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.

10 is a configuration diagram of an ECCE in a distributed EPDCCH set composed of two EPRBs according to the first embodiment.

Referring to FIG. 10, the distributed EPDCCH set is composed of two PRB pairs of EPRB # 0 and EPRB # 1, and two EREGs in EPRB # 0 and EPRB # 1 according to condition 1-1). Two EREGs are combined to form an ECCE with four EREGs.

=

=2 EPRB 단위의 간격을 가지는 N=4개의 분산된 EPRB로부터 각각 1개의 EREG씩 뽑아서 각각의 ECCE가 구성된다. 즉, 하나의 ECCE는 (EPRB #0에서 1개의 EREG, EPRB #2에서 1개의 EREG, EPRB #4에서 1개의 EREG, EPRB #6에서 1개의 EREG)로 해당 ECCE를 전송하기 위한 4개의 EREG들에 대한 매핑이 이루어지거나, 혹은 (EPRB #1에서 1개의 EREG, EPRB #3에서 1개의 EREG, EPRB #5에서 1개의 EREG, EPRB #7에서 1개의 EREG)로 해당 ECCE를 전송하기 위한 4개의 EREGs에 대한 매핑이 이루어지도록 할 수 있다.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 of the EREGs according to the above condition 1-2)

=

Each ECCE is constructed by extracting one EREG from each of N = 4 distributed EPRBs having an interval of = 2 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 first 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 2 ]

In order to configure one ECCE in any distributed EPDCCH set, a method of selecting an EREG to be selected in the corresponding EPRB along with the EPRB mapping method described in Embodiment 1 above should be defined. In the present specification, an ECCE / EREG mapping method of the following three embodiments is provided by combining the EREG selection method and the EPRB hopping method of the first embodiment.

[ Example 2 -One]

개의 EREG를 매핑해야 하며, 1-2)의 경우에는 각각의 EPRB 1개의 EREG를 매핑하도록 해야 한다. 이 경우, 각각의 EPRB에서 동일한 인덱스를 가지는 EREG들을 매핑하여 각각의 ECCE를 구성하도록 할 수 있다. 이 경우, 해당 EPDCCH 셋을 구성하는 총

개의 ECCE들(ECCE #i, i=0,1,2,...,

)은 각각 해당 ECCE를 구성하는 가장 작은(lowest) EREG 인덱스와 그 다음 EPRB 인덱스의 순으로 인덱싱이 될 수 있다. 즉, 상기의 실시예1에 의한 해당 ECCE를 구성하는 EPRB 매핑에 따라 해당 ECCE를 구성하는 EPRB에서 선택된 EREG들의 인덱스가 가장 작은 ECCE부터 차례로 ECCE #0부터 인덱싱을 수행하도록 하며, 상기의 1-2)의 경우와 같이 서로 다른 N개의 EPRB가 매핑된 ECCE들 간에 각각의 ECCE를 구성하는 EPRB들로부터 선택된 EREG 인덱스가 동일한 경우에는 가장 작은 EPRB 인덱스들로 매핑된 ECCE부터 인덱싱을 수행하도록 할 수 있다. 즉, 해당 분산형 EPDCCH 셋을 구성하는 ECCE #i를 구성하는 EREG는 아래의 수학식 1과 수학식 2에 의해 구성될 수 있다.
As a first embodiment, the ECCE may be configured by EREGs having the same index from each of the EPRBs mapped to configure one ECCE according to the first embodiment. That is, in order to configure one ECCE, in the case of 1-1), each of the 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 first 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.

에 대하여,i = 0,1, ...,

about,

[Equation 1]

이고, n(i)=

이다
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

&Quot; (2) &quot;

이고, n(i)=

이다. (단, [x]는 x를 넘지 않는 최대 정수)
N <M and ECCE #i is {EREG #n (i) of EPRB #m (a)}. Where m (a) = m (a) for a = 0,1, ..., N-1

And n (i) =

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 2-1.

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

이 된다. 따라서, ECCE #0은 {EREG #0 및 EREG #1 of EPRB #0 및 EPRB #1}이 되고, 도 12의 (a)와 같이 EPRB #0에서 EREG #0과 EREG #1을 선택하고 EPRB #1에서 EREG #0과 EREG #1을 선택하여 ECCE #0을 구성할 수 있다.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,

. 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.

,

={0,2,4,6 for a=0,1,2,3}이 된다. 따라서, ECCE #0은 {EREG #0 of EPRB #0, EPRB #2, EPRB #4, EPRB #6}이 되고, 도 12의 (b)와 같이 EPRB #0에서 EREG #0을 선택하고, EPRB #2에서 EREG #0을 선택하고, EPRB #4에서 EREG #0을 선택하고, EPRB #6에서 EREG #0을 선택하여 ECCE #0을 구성할 수 있다.
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,

,

= {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 2 -2]

EPRB들로 볼 수 있다.As a second embodiment, according to Embodiment 1, the ECCE may be configured with EREGs having a shifted index from each of the EPRBs mapped to configure one ECCE. According to the first embodiment, the hopping size of the EPRB index to select an EREG constituting an arbitrary 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 1. 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 1 is 1 (when N≥M, when 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.

번의 turn을 돌리면, 해당 EPDCCH 셋을 구성하는 모든

개의 ECCE를 매핑할 수 있다.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 2-2 may be represented by Equations 3 and 4 below.

에 대하여,i = 0,1, ...,

about,

&Quot; (3) &quot;

이고,

이다. (단, [x]는 x를 넘지 않는 최대 정수)
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)

&Quot; (4) &quot;

이고,

이다.(단, [x]는 x를 넘지 않는 최대 정수)
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 2-2.

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 2 -3]

씩 EREG 인덱스를 증가시키면서 선택하여 매핑할 수 있다. 즉, 임의의 분산형 EPDCCH 셋을 구성하는 EPRB #0 ~ EPRB #(M-1)의 M개의 EPRB에서 EPRB #0의 EREG #0를 시작으로 상기의 실시예1에 따른 호핑 사이즈만큼 EPRB를 호핑하면서 각각의 EPRB로부터 1개의 EREG를 선택한다.Similar to the above Example 2-2, NPRs are selected and mapped in total by one EREG while hopping the EPRB.However, unlike Example 2-2, 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 Example 1 above, starting with EREG # 0 of EPRB # 0. Select one EREG from each EPRB.

씩 늘리도록 한다. 예를 들어, 임의의 분산형 EPDCCH 셋을 위해 할당된 EPRB의 개수가 8(M=8)이고, 해당 EPDCCH 셋이 노멀 CP의 노멀 하향링크 서브프레임에서 정의된 경우(즉, N=4인 경우), 상기의 실시예1의 조건에 따라 EPRB 호핑 사이즈는 M/N=2로 결정될 수 있다. 또한, 본 실시예2-3에 따라 ECCE를 구성하는 경우, 각각의 ECCE를 구성하는 EPRB들에서 선택하는 EREG 호핑 사이즈는 16/4=4로 결정된다.At this time, every time the EPRB is hopped, the EREG index selected from the EPRB is not increased by 1 as in the above Example 2-2, 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 1 above. In addition, when configuring the ECCE according to the present embodiment 2-3, 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.

, 즉, 본 예에서는 modulo 4을 취한 값이 0이 되는 인덱스를 가지는 모든 EREG들이 각각의 ECCE #0~ECCE#(M-1)까지 M(본 예에서는 8)개의 ECCE들을 매핑하는데 사용된다.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.

번의 턴을 돌리면, 해당 EPDCCH 셋을 구성하는 모든

개의 ECCE를 매핑할 수 있다. 단, 이 때 임의의 ECCE를 구성하기 위한 해당 N번째 EREG를 매핑하기 전에 해당 EPDCCH 셋을 구성하는 마지막 EPRB(largest EPRB)에 도달하면, 다시 처음의 EPRB(가장 작은 EPRB)로 돌아가는 사이클릭 시프팅(cyclic shifting)을 적용하여 EREG 매핑을 계속하도록 한다.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 2-3 may be represented by Equations 5 and 6 below.

에 대하여,i = 0,1, ...,

about,

&Quot; (5) &quot;

이고,

이다. (단, [x]는 x를 넘지 않는 최대 정수)
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)

&Quot; (6) &quot;

이고,

이다. (단, [x]는 x를 넘지 않는 최대 정수)
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 2-3.

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 ECCEs according to the embodiment 2-2 and the embodiment 2-3 will be described in more detail.

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

Referring to Table 4, 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 number of available REs of ECCEs according to the embodiment 2-3 when the size of the legacy PDCCH is 2 will be described.

Referring to Table 5, 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 usable REs between ECCEs according to Example 2-2. In addition, the ECCEs according to the embodiment 2-3 have no 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 second embodiment, the embodiments of the first embodiment have been described, but the present invention is not limited thereto, and the embodiments described in the second embodiment may be independent of the first embodiment.

For example, according to the embodiment 2-1, ECCEs may be configured with EREGs having the same index, and in the case of an EPDCCH set consisting of eight 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 2-1 may be independent of Example 1, 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 2, which is independent of Example 1, is given. According to the embodiment 2-2, 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 2-2 may be independent of Example 1, 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 2-3, ECCE may be configured by selecting EREG while increasing the index by 16 / N without hopping EPRB independently of Example 1. 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.

Embodiments 1 and 2 above provide an ECCE / EREG mapping method in any distributed EPDCCH set, and the ECCE / EREG mapping function of Embodiment 2-1 is defined by Equations 1 and 2 below. The ECCE / EREG mapping function according to Example 2-2 was defined by Equations 3 and 4, and the ECCE / EREG mapping function of Example 2-3 was defined by Equations 5 and 6. . However, Equations 1 to 6 are examples of function expressions reflecting the respective embodiments, and other types of functional formulas incorporating the concepts of Embodiments 2-1, 2-2, and 2-3 are introduced. 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 a data region of two or more resource block pairs in a subframe is repeated by indexing 16 numbers in each of the resource block pairs with frequency priority. The remainder of dividing by 4 of the Enhanced Resoure Element Groups consisting of resource elements having the same index with respect to the Resource Elements assigned to is 4 resource element groups or 2 of the same different index. Control channel elements are allocated to eight resource element groups of different indexes having the same division (S1510).

In step S1510, the resource element groups constituting the control channel element is 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.

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.

EREGs constituting the ECCE are located in two or more resource block pairs. This is to transmit the EPDCCH in a distributed type. Resource block pairs for allocating ECCE at a transmission / reception point may configure the EPDCCH set in a distributed type.

The transmission / reception point may allocate ECCE by distributing EREGs to pairs of resource blocks so that frequency diversity gain is maximized. The content described in Embodiment 1 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 (S1520).

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, in a subframe, a terminal receiving control information from a transmission / reception point through a data region of two or more resource block pairs may include

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.

In step S1610, resource element groups constituting the control channel element is 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.

EREGs constituting the ECCE are located in two or more resource block pairs. This transmits the EPDCCH in a distributed type. Resource block pairs for allocating ECCE may configure the EPDCCH set in a distributed type.

EREGs may be distributed and allocated to RB pairs so that frequency diversity gain is maximized. The content described in Embodiment 1 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 for transmitting control information to a terminal through a data area of two or more resource block pairs in a subframe includes a controller 1710, a transmitter 1720, and a receiver ( 1730), and the like.

The control unit 1710 repeats the 16 numbers in each of the resource block pairs in frequency-first order and enhances the resource element groups having the same index with respect to the resource elements assigned the index. medium

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.

The controller 1710 controls the resource element groups constituting the control channel element to be located in two or more resource block pairs. This is to transmit the EPDCCH in a distributed type. Resource block pairs for allocating ECCE at a transmission / reception point may configure the EPDCCH set in a distributed type.

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 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, in a subframe, a terminal 1800 receiving control information from a transmission / reception point through a data area of two or more resource block pairs

The receiver 1810, the controller 1820, the transmitter 1830, and the like may be included.

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, the resource element groups constituting the control channel element are located in two or more resource block pairs. This is to transmit the EPDCCH in a distributed type. Resource block pairs for allocating ECCE at a transmission / reception point may configure the EPDCCH set in a distributed type.

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 invention and the ECCE indexing in any 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 specification mentioned in the above-mentioned embodiments are omitted for the sake of brevity and constitute a part of this specification. Therefore, it is to be understood that the content of some of the contents related to the above standard is added to or included in 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, it is to be understood that the content of the above standard content and portions of the standard documents are added to or contained in the scope of the present invention.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The 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.

Claims (20)

A control information transmission method of a transmission / reception point for transmitting control information to a terminal through a data area of two or more resource block pairs in a subframe,
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, or eight resource element groups of different indices having the same index. The resource element groups constituting the control channel element 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. The method of claim 1,
Assigning the control channel elements;
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. The method of claim 1,
The resource block pairs are configured to configure one downlink physical downlink control channel (enhanced Physical Downlink Control Channel) set in a distributed manner (distributed) method. 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. 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. A method of receiving control information of a terminal for receiving control information from a transmission / reception point through a data area of two or more resource block pairs in 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. The resource element groups constituting the control channel element are located in at least two resource block pairs; And
And receiving the control information from the radio signal. The method according to claim 6,
And the control channel elements are allocated by distributing the resource element groups to the resource block pairs so as to maximize a frequency diversity gain. The method according to claim 6,
The resource block pairs are configured to configure one downlink physical downlink control channel (enhanced Physical Downlink Control Channel) set in a distributed manner. The method according to claim 6,
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. The method according to claim 6,
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. A transmission / reception point for transmitting control information to a UE through a data region of two or more resource block pairs in a subframe.
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. Control unit for allocating the control channel elements to the four resource element groups of the other different index the same or the remainder divided by 2, the resource element groups constituting the control channel element Located in two or more resource block pairs; And
And a transmitter for transmitting control information to the terminal through at least one control channel element among the control channel elements. 12. The method of claim 11,
The control unit,
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. 12. The method of claim 11,
The resource block pairs transmit and receive points, characterized in that to configure one enhanced downlink control channel (enhanced physical downlink control channel) set in a distributed manner. 12. The method of claim 11,
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 11,
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. A terminal for receiving control information from a transmission / reception point through a data area of two or more resource block pairs in 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 receiving unit, wherein the resource element groups constituting the control channel element are located in at least two resource block pairs; And
And a control unit for obtaining the control information from the radio signal. 17. The method of claim 16,
The control channel elements are allocated by distributing the resource element groups to the resource block pairs so that frequency diversity gain is maximized. 17. The method of claim 16,
The resource block pairs are configured to configure one downlink physical downlink control channel set in a distributed manner. 17. The method of claim 16,
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}. 17. The method of claim 16,
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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