KR20140019720A - Method for transiting control information of transmission/reception point, transmission/reception point thereof, method for mapping uplink control channel resource of terminal and terminal thereof - Google Patents

Abstract

The present invention relates to an apparatus and a method for transiting uplink control information for a terminal which transits downlink control information through downlink control information introduced to a data region and receives this information. The present invention relates to a method for mapping an uplink control channel resource for the uplink HARQ ACK/NACK feedback of a terminal to the downlink data channel through the downlink scheduling information transited through the downlink control channel, and a terminal thereof. [Reference numerals] (S1010) Transiting downlink; (S1020) Transiting uplink

Description

Method for transiting control information of transmission / reception point, transmission / reception point thereof, method of mapping uplink control channel resource of terminal, method for mapping uplink control channel resource of transmission / reception point information, method for mapping Terminal and Terminal

The present invention relates to a method and apparatus for transmitting downlink control information through a downlink control channel introduced into a data region and transmitting uplink control information for a terminal receiving the control information. The present invention relates to a PUCCH resource mapping method and apparatus for uplink HARQ ACK / NACK feedback of a UE for a downlink data channel through downlink scheduling information.

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.

Meanwhile, in this wireless communication system, uplink HARQ ACK / NACK feedback of a terminal receiving downlink scheduling information through a new downlink control channel newly introduced into a data area for improving performance and capacity of a downlink control channel is provided. It was necessary to define a PUCCH resource mapping method.

In this background, an object of the present specification is to provide a method for transmitting control information of a transmission / reception point and a transmission / reception point, an uplink control channel resource mapping method of a terminal, and the terminal in a wireless communication system.

In an aspect, the present disclosure provides a control information transmission method of a transmission / reception point for transmitting control information for a specific terminal through a data region of a physical resource block pair of a subframe. Allocating at least one set of Enhanced Physical Downlink Control CHannel composed of X resource block pairs (X is a natural number less than or equal to the number of RBs of one or more full bands) and indexing for each downlink control channel set It provides a control information transmission method of a transmission and reception point comprising transmitting the control information to the specific terminal through at least one of the at least two enhanced control channel elements (Enhanced Control Channel Elements).

In another aspect, the present specification relates to at least one set of Enhanced Physical Downlink Control Channels composed of X resource block pairs (X is a natural number less than or equal to the number of RBs of one or more full bands) of a subframe. Receiving control information on downlink scheduling information from at least one transmitting and receiving point through at least one of at least two enhanced control channel elements indexed for each downlink control channel set and assigning the same according to downlink scheduling information A UE comprising mapping a PUCCH resource using a minimum index of the control channel element as one resource determination element when mapping a physical uplink control channel (PUCCH) resource of ACK / NACK to a physical downlink shared channel (PDSCH) Provides a method for mapping uplink control channel resources.

In another aspect, the present disclosure is a transmission and reception point for transmitting control information of a transmission and reception point for transmitting control information for a specific terminal through a data region of a physical resource block pair of a subframe, A control unit for allocating at least one set of Enhanced Physical Downlink Control CHannel composed of X resource block pairs (X is a natural number less than or equal to the number of RBs of one or more full bands) and at least indexed for each set of downlink control channels. Provides a transmission and reception point comprising a transmitter for transmitting the control information to the specific terminal through at least one of two control channel elements (Enhanced Control Channel Elements).

In another aspect, the present disclosure is directed to at least one set of Enhanced Physical Downlink Control Channels composed of X resource block pairs (X is a natural number less than or equal to the number of RBs of one or more full bands) of a subframe. According to the receiver and the downlink scheduling information for receiving control information for the downlink scheduling information from at least one of the at least one control channel element (Enhanced Control Channel Elements) indexed for each of the downlink control channel set And a controller configured to map PUCCH resources by using the minimum index of the control channel element as one resource determination element when mapping a physical uplink control channel (PUCCH) resource of ACK / NACK to an allocated physical downlink shared channel (PDSCH). Provide a terminal.

In a wireless communication system according to an embodiment, a method for transmitting control information of a transmission / reception point, a transmission / reception point thereof, a method of mapping uplink control channel resources of a terminal, and the terminal transmit downlink control information through a downlink control channel and transmit the control information. It is effective in transmitting uplink control information for a receiving terminal.

1 illustrates an example of a wireless communication system to which embodiments are applied.
2 and 3 are flowcharts of downlink transmission and uplink transmission in the wireless communication system of FIG. 1.
4 illustrates how control information according to each PUCCH format is mapped to a resource block (RB).
FIG. 5 illustrates one resource block pair of a downlink subframe in the case of a normal cyclic prefix (CP) in a Long Term Evolution (LTE) or LTE-Advanced (LTE-A) system.
6 shows two types of EPDCCH transmissions: centralized EPDCCH transmission and distributed EPDCCH transmission.
FIG. 7 illustrates one centralized EPDCCH set with K _L = 1 and one distributed EPDCCH set with K _D = 1 when X = 2 and N = 4.
8 is a flowchart illustrating a control information transmission method of a transmission / reception point for transmitting control information for a specific terminal through a data area of a physical resource block pair of a specific subframe according to an embodiment of the present invention.
9 is a flowchart illustrating a PUCCH resource mapping method of a terminal receiving downlink scheduling information through an EPDCCH according to another embodiment.
10 is a flowchart summarizing the entire process of downlink transmission of a transmission and reception point and uplink transmission of a terminal.
11 is a diagram illustrating a configuration of a transmission and reception point according to another embodiment.
12 is a diagram illustrating a configuration of a user terminal according to another embodiment.

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. 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 a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, and a PDSCH may be expressed in the form of transmitting and receiving a PUCCH, a PUSCH, a PDCCH, and a PDSCH.

2 and 3 are flowcharts of downlink transmission and uplink transmission in the wireless communication system of FIG. 1.

2 and 3, the eNB 110, which is the first transmission / reception point, which is one of the transmission and reception points 110 and 112, may perform downlink transmissions S210 and S310 to the terminals 120 and 122. The eNB 110 performs downlink control information and uplink data channels such as a physical downlink shared channel (PDSCH), which is a main physical channel for unicast transmission, and scheduling required for reception of the PDSCH. A physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in (eg, a physical uplink shared channel (PUSCH)) may be transmitted. Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

Referring to FIG. 2, the first terminal 120 and UE1 may perform uplink transmission (S220) to the eNB 110 which is the first transmission / reception point. Referring to FIG. 3, the second terminal 122 and the UE2 may perform uplink transmission (S320) to the RRH 112, which is the second transmission / reception point, which is one of the transmission and reception points 110 and 112. In contrast, according to a wireless environment, the first terminal 120 may perform uplink transmission to the RRH 112 and the second terminal 122 may perform uplink transmission to the eNB 110. In addition, the number of terminals may be two or more. However, in the following embodiment, the number of terminals is two, one terminal is an eNB 110, the other terminal will be described by way of example to transmit the uplink signal to the RRH (112).

2 and 3 again, the first terminal 120 and the second terminal 122 are uplink control channels (eg, the first transmission and reception point 110 and the second transmission and reception point 112, respectively). A UE may transmit a scheduling request (SR), a HARQ (ACK) for a received downlink data channel transport block, and a report of a UE related to a downlink channel state through a PUCCH (Physical Uplink Control CHannel) The uplink data may be transmitted through an uplink data channel (for example, a physical uplink shared channel (PUSCH)). In addition, the first terminal 120 and the second terminal 122 are reference signals (eg, DM-RS) for demodulation of an uplink channel to the first transmission / reception point 110 and the second transmission / reception point 112, respectively. (DeModulation Reference Signal)) may be transmitted.

Hereinafter, in the present specification, the first terminal 120 and the second terminal 122 are unified to the terminal 120 and the first transmission and reception point 110 and the second transmission and reception point 112 are unified to the transmission and reception point 110.

In this case, the PUCCH may support various formats as shown in Table 1 below.

PUCCH format 1 / 1a / 1b may be used for scheduling request (SR) and HARQ-ACK transmission. The PUCCH format 2 / 2a / 2b may be used for CQI (Channel Quality Indicator) / PMI (Precoding Matrix Indicator) / RI (Rank Indication) transmission. And, PUCCH format 3 can be used for a large number of HARQ-ACK / NACK transmission.

을 사용한다.

은 심볼 넘버(l)과 슬롯 넘버(n_s)에 따라 다음의 수학식 1과 같이 정의될 수 있다.All PUCCH formats have a cell-specific cyclic shift (CS)

Lt; / RTI >

May be defined as in Equation 1 according to the symbol number l and the slot number n _s .

은 상향링크에서 한 슬롯 당 사용되는 전체 SC-FDMA(Single Carrier Frequency Division Multiple Access) 심볼의 개수에 해당한다. c(i)는 의사-랜덤(pseudo-random) 시퀀스로서, 초기값(c_init)은 셀 아이디(

)이다. 따라서, PUCCH의 순환 지연은 셀 아이디에 의해 결정될 수 있다.In Equation (1)

Corresponds to the total number of SC-FDMA symbols used per slot in the uplink. c (i) is a pseudo-random sequence, the initial value (c _init ) is the cell ID (

)to be. Therefore, the cyclic delay of the PUCCH can be determined by the cell ID.

4 illustrates how control information according to each PUCCH format is mapped to a resource block (RB).

The physical resource block used for transmission of the PUCCH as shown in FIG. 4 may be defined in Equation 2 in the slot n _s .

은 PUCCH 포맷에 의존한다.Variable in Equation 2

Depends on the PUCCH format.

은In the case of Formats 1 and 1a, 1b

silver

ego,

은

이고, 포맷 3인 경우에

은

이다.In the case of formats 2, 2a and 2b

silver

, And in the format 3

silver

to be.

는 상향링크 자원 블록의 개수이며,

는 하나의 자원 블록에서 서브캐리어의 개수이다.

는 상위계층 시그널링을 통해 전달되는 값으로서,

는 각 슬롯에서 PUCCH 포맷 2/2a/2b 전송을 위해 가용한 자원 블록을 나타낸다.

는 PUCCH 포맷 1/1a/1b와 2/2a/2b가 혼합되어 사용되는 자원 블록에서 PUCCH 포맷 1/1a/1b를 위해 사용되는 순환 지연의 개수를 나타내고,

의 정수 배이며,

는 상위계층 시그널링을 통해 전달된다. PUCCH 포맷 1/1a/1b, 2/2a/2b, 및 3의 전송을 위해 사용되는 직교 자원은 각각

,

, 및

로 표현된다.In Equation 2, n _PRB is a physical resource block number,

Is the number of uplink resource blocks,

Is the number of subcarriers in one resource block.

Is a value transmitted through upper layer signaling,

Represents a resource block available for PUCCH format 2 / 2a / 2b transmission in each slot.

Represents the number of cyclic delays used for the PUCCH format 1 / 1a / 1b in the resource block in which the PUCCH formats 1 / 1a / 1b and 2 / 2a / 2b are mixed,

Lt; / RTI >

Is transmitted via upper layer signaling. The orthogonal resources used for transmission of the PUCCH formats 1 / 1a / 1b, 2 / 2a / 2b, and 3 are

,

, And

Lt; / RTI >

에 해당하는 자원 블록들이 PUCCH 포맷 2/2a/2b 전송을 위해 사용되고, 이에 대한 정보(

)는 상향링크 시그널링을 통해 전달된다. PUCCH 포맷 2/2a/2b 전송을 위한 자원 블록의 안쪽에서 최대 하나의 자원 블록들이 PUCCH 포맷 1/1a/1b와 2/2a/2b가 혼합되어 사용되고, 이러한 자원 블록에서 PUCCH 포맷 1/1a/1b를 위한 직교 자원이 몇 개인지를 나타내는 파라미터가

에 해당한다. 그 다음 자원 블록들은 PUCCH 포맷 1/1a/1b 전송을 위해 사용된다.Referring to Equation 2, at the edge of the uplink bandwidth

Are used for PUCCH format 2 / 2a / 2b transmission, and information

) Is transmitted through uplink signaling. 1 / 1a / 1b and 2 / 2a / 2b are mixed and used in the resource block for PUCCH format 2 / 2a / 2b transmission, and the PUCCH format 1 / 1a / 1b A parameter indicating how many orthogonal resources for

. The resource blocks are then used for PUCCH format 1 / 1a / 1b transmissions.

에 대하여

만큼의

씩 끊어서 하나씩 증가한다. 즉, PUCCH가 매핑되는 특정 서브프레임 각각에 대하여, 두 개의 슬롯으로 구성된 하나의 서브프레임의 두 개의 자원 블록 내에서의 자원 인덱스(

)의 총 개수는

이고, 이는 자원 블록 내에서 직교성을 갖는 총 자원의 개수를 의미한다.In Equation 2, the index of the resource block for PUCCH format 1 / 1a / 1b only is for each of two slots in one subframe.

about

As many

It is increased by one by one. That is, for each specific subframe to which the PUCCH is mapped, a resource index (hereinafter referred to as " resource index ") in two resource blocks of one subframe consisting of two slots

The total number of

, Which means the total number of resources having orthogonality in the resource block.

는 안테나 인덱스(

)에 대하여 PUCCH 포맷 1/1a/1b를 위해 사용되는 전체 직교 자원에 대하여 그 직교 자원의 인덱스를 의미하는 파라미터이고,

는 하나의 자원 블록 내에서 사용되는 전체 직교 자원에 대하여 그 직교 자원의 인덱스를 의미하는 파라미터이다.In other words,

Is an antenna index (

) Is a parameter indicating the index of the orthogonal resource for all orthogonal resources used for the PUCCH format 1 / 1a / 1b,

Is a parameter indicating the index of the orthogonal resource for all orthogonal resources used in one resource block.

PUCCH resource for each antenna port for HARQ ACK / NACK feedback on a corresponding PDSCH reception of a UE in which PDSCH allocation information for a corresponding UE is transmitted through reception of downlink scheduling information through a conventional legacy PDCCH allocated to a control region of a resource block The mapping is determined by a control channel element (CCE) index on which an upper layer parameter (for example, an RRC parameter) and corresponding downlink scheduling information are transmitted as shown in Equations 3 and 4 below.

를 지칭한다.

는 해당 하향링크 스케줄링 정보가 전송된 최소 CCE 인덱스값을 나타내고, 이는 동적으로 정의될 수 있다. Equations 3 and 4 are PUCCH resources for HARQ ACK / NACK feedback in antenna port 0 and antenna port 1 respectively in a terminal supporting two antenna port transmissions in a corresponding terminal.

Quot;

Denotes a minimum CCE index value to which the corresponding downlink scheduling information is transmitted, and this can be dynamically defined.

는 상위계층 시그널링(예를 들어 RRC 시그널링)에 의해 설정된 단말-특정 파라미터로, PUCCH 포맷 1/1a/1b 자원 할당을 위한 오프셋으로 작용하여 동적으로 할당되는 PUCCH 영역이 시작되는 지점을 결정하게 할 수 있다.

Specific parameters set by upper layer signaling (e.g., RRC signaling) to serve as an offset for PUCCH format 1 / 1a / 1b resource allocation to determine the point at which a dynamically allocated PUCCH region is to start have.

As described above, in the area where the PUCCH format 2 / 2a / 2b and the PUCCH format 2 / 2a / 2b and 1 / 1a / 1b are mixed, the resource block is semi-static through the upper layer signaling, And the resource block in the area for PUCCH format 1 / 1a / 1b can be determined dynamically. Accordingly, the uplink transmission resource may be classified into a semi-static configuration region 410, a dynamic configuration region 420 in which the PUCCH format 1 / 1a / 1b may be configured, and a PUSCH region 430, as shown in FIG. 4. Can be.

However, the PUCCH resource mapping method according to Equations 3 and 4 described above is HARQ ACK / NACK through PUCCH formats 1a / 1b of a UE in which one serving cell is configured in a frame structure type 1 (FDD) system. PUCCH resource mapping method for transmission. In addition, the PUCCH resource mapping rule for a terminal configured with one or more serving cells (that is, a terminal with carrier aggregation) is applied as a function of a minimum CCE index and a higher layer parameter similarly to the aforementioned method. Or a plurality of candidate PUCCH resource values are determined in advance through higher layer signaling, and the PUCCH to be used among the candidate PUCCH resource values through the 'TPC command for PUCCH' information region of actual downlink scheduling information. An ACK / NACK Resource Indication (ARI) scheme indicating resources may be used.

FIG. 5 illustrates one resource block pair of a downlink subframe in the case of a normal cyclic prefix (CP) in a Long Term Evolution (LTE) or LTE-Advanced (LTE-A) system.

Referring to FIG. 5, one resource block pair of a downlink subframe in a normal cyclic prefix (CP) may include 14 × 12 resource elements (12 × 12 in an extended CP). A Resource Element (RE) can be composed of one OFDM symbol on the time axis and one subcarrier on the frequency axis.

Four of the four OFDM symbols (l = 0 to 3) among the 14 OFDM symbols belonging to one resource block pair are physical control format information channel (PCFICH), physical hybrid ARQ indicator channel (PHICH), and physical downlink control channel (PDCCH). And the remaining OFDM symbols (l = 4 to 13) may be a data region 520 allocated for a data channel such as PDSCH (Physical Downlink Shared CHannel). have. In FIG. 5, four OFDM symbols are allocated to the control region 510, but it is possible to allocate one to four OFDM symbols for the control region 510. The size information of the OFDM symbol of the control region 510 may be transmitted through the PCFICH.

A reference signal may be mapped to a specific resource element of the downlink. That is, the common reference signal or cell-specific reference signal (CRS) 530, the demodulation reference signal or the UE-specific reference signal (DeModulation Reference Signal or UE-specific Reference Signal) in the downlink DM-RSs 532 and 534 and a Channel Status Information Reference Signal (CSI-RS) may be transmitted. In FIG. 5, only the CRS 530 and the DM-RSs 532 and 534 are shown for convenience of description.

The CRS 530 located in the control region 510 may be used for channel estimation for decoding the PDCCH, and the CRS 530 located in the data region 520 may be used for downlink channel measurement. Channel estimation for data decoding of the data region 520 may be performed using the DM-RSs 532 and 534.

The resources of the control area 510 reduce the resources of the data area 520 used for data transmission as overhead of the system. 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 510. Therefore, an increase in control channel resources is inevitable, so a control channel transmission / reception method for multiple users using a spatial division multiplexing technique in the data region 520 may be considered. This method transmits and receives a control channel in the data area 520. For example, the control channel transmitted in the data region 520 may be called EPDCCH (Extended PDCCH or Enhanced PDCCH), but is not limited thereto.

In the data region 520, control channel resources may be allocated in units of resource blocks (or resource block pairs) for compatibility with data channel (eg, PDSCH) resources. Since the decoding reference signal (DM-RS) can be used to transmit the control channel in the data region 520, the control channel can be transmitted using a beam forming technique.

In this specification, allocation of control information is used in the same sense as allocation of a control channel. In other words, the allocation of control channels in this specification means allocating control information to resource elements.

Meanwhile, in the LTE-A system, uplink HARQ ACK / NACK feedback of a UE receiving downlink scheduling information through an EPDCCH newly introduced into a data region (PDSCH region) for improving performance and capacity of a downlink control channel. It is necessary to define a PUCCH resource mapping method.

The present invention provides a PUCCH resource mapping method for uplink HARQ ACK / NACK feedback of a terminal receiving downlink scheduling information through an newly introduced EPDCCH. In particular, the present invention defines an implicitly determined part and an explicitly determined part for determining PUCCH resource mapping for a terminal receiving downlink control information (DCI) through EPDCCH. When the ECCE index of the EPDCCH is used as a concept similar to the CCE index of the legacy legacy PDCCH as an implicit decision part, an ECCE indexing method for the EPDCCH is provided.

(수학식 3과 4의

에 해당) 명시적 결정 파라미터(explicitly determined parameter),

(수학식 3과 4의 ) 및 묵시적 결정 오프셋(implicitly determined offset), offset_i 을 PUCCH 자원 결정 요소(component of PUCCH resource determination)로 포함할 수 있다.In more detail, a corresponding antenna port for HARQ ACK / NACK feedback on a corresponding PDSCH reception of a terminal through which downlink scheduling information is transmitted through the downlink scheduling information through the EPDCCH allocated to the data region 520 of the resource block is transmitted. Each PUCCH resource mapping includes an implicitly determined parameter determined by ECCE,

(Equation 3 and 4

Explicitly determined parameter,

(Equation 3 and 4 ) And an implicitly determined offset, offset _i may be included as a component of PUCCH resource determination.

In more detail, a corresponding antenna port for HARQ ACK / NACK feedback on a corresponding PDSCH reception of a terminal through which downlink scheduling information is transmitted through the downlink scheduling information through the EPDCCH allocated to the data region 520 of the resource block is transmitted. Each PUCCH resource mapping is determined by Equations 5 and 6, respectively.

를 상세히 설명한다.First, an explicit determination parameter, which is one of the following components of PUCCH resource determination,

Will be described in detail.

값이 해당 셀 내의 모든 단말에게 동일하게 적용될 수 있다. As an embodiment of determining an explicit determination parameter, in case of a terminal receiving downlink scheduling information for PDSCH transmission through a legacy PDCCH allocated to a control region, a transmission / reception point for mapping uplink HARQ ACK / NACK resource RRC parameters transmitted via UE-specific higher layer signaling from (base station or eNB),

The value may be equally applied to all terminals in the cell.

에 해당하는 값을 결정하는 첫번째 방법으로서, 전술한 레거시 PDCCH 단말을 위한 단말-특정 RRC 파라미터인

을 재사용하여 적용할 수 있다.The present invention is an uplink HARQ ACK / NACK resource mapping method for a UE configured to receive downlink scheduling information for PDSCH transmission through an EPDCCH.

As a first method of determining a value corresponding to, the UE-specific RRC parameter for the aforementioned legacy PDCCH UE is

Can be reused and applied.

값을 상향링크 HARQ ACK/NACK 전송을 위한 PUCCH 자원 매핑 시 수학식 5와 6의

로 활용할 수 있다. In this case, even if the terminal is configured to receive the DCI through the EPDCCH described above included in the system information (system information) received from the base station in the same manner as the terminal receiving the DCI through the legacy legacy PDCCH

Values of Equations 5 and 6 when PUCCH resource mapping for uplink HARQ ACK / NACK transmission

Can be utilized as

를 단말-특정 상위계층 시그널링을 통해 각각의 단말 별로 독립적으로 설정하도록 할 수 있다. As another embodiment of determining the explicit determination parameter, in case of a UE configured to receive DCI through EPDCCH, the above-described explicit determination parameter,

Can be set independently for each terminal through terminal-specific higher layer signaling.

값을 전송하도록 하며, 단말은 이를 기반으로 전술한 수학식 5와 6에 의한 PUCCH 자원 매핑을 적용한다. That is, when the transmission and reception point is configured to receive the DCI through the EPDCCH for any terminal, an explicit determination parameter for the terminal,

Value, and the terminal applies the PUCCH resource mapping according to Equations 5 and 6 described above.

,

, … ,

까지 n개의 명시적 결정 파라미터들,

(k=0 내지 n-1)을 설정한 후, 해당 단말을 위한 하향링크 스케줄링 정보를 전송 시, 전술한 n개의 파라미터들 중 HARQ ACK/NACCK 피드백 PUCCH 자원 매핑 시 적용할 파라미터를 지시할 수 있다. In another embodiment of determining an explicit decision parameter, via UE-specific higher layer signaling for any UE configured to receive DCI over EPDCCH

,

, ... ,

N explicit decision parameters,

After setting (k = 0 to n-1), when transmitting downlink scheduling information for a corresponding UE, a parameter to be applied when HARQ ACK / NACCK feedback PUCCH resource mapping among the aforementioned n parameters may be indicated. .

(k=0 내지 n-1)에서 n=4인 경우 이에 따라 아래의 표 2와 같이 명시적 결정 파라미터,

가 결정되도록 할 수 있다. To this end, so as to define a new information field (information field) (however, satisfies the n≤2 ^M) of the new M-bit (M = log n) for the ACK / NACK resources indicated above the downlink scheduling information for the terminal can do. Alternatively, an existing information area (information field) of downlink scheduling information for the terminal may be used for indication of a corresponding ACK / NACK resource. For example, the existing 'TPC command for PUCCH' information area is used for ACK / NACK resource indication, for example

If n = 4 at (k = 0 to n-1), then the explicit determination parameters, as shown in Table 2 below,

Can be determined.

으로

가 적용된다.For example, when n = 4, the value of the 'TPC command for PUCCH' information area is 2 bits and the value is '10'.

to

Is applied.

에 대한 ACK/NACK 자원 지시가 이루어질 수도 있다.However, in addition to the 'TPC command for PUCCH', candidate parameters allocated through UE-specific higher layer signaling using another information region of downlink scheduling information for the corresponding UE,

An ACK / NACK resource indication may be made for.

를 상세히 설명한다.Implicit determination parameter, which is one of the following components of PUCCH resource determination,

Will be described in detail.

As an example of determining an implicit decision parameter, FIG. 6 illustrates two EPDCCH transmission types: 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. 6, 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 FIG. 6A means that one ECCE is located in one resource block pair and transmitted. Meanwhile, distributed EPDCCH transmission shown in FIG. 6B means that one ECCE is located in at least two resource block pairs and transmitted.

ECCE corresponds to a certain number of Enhanced Resource Element Groups (ERREGs). Each EREG means a specific number of resource elements (REs) available. In conclusion, ECCE means a set of available resource elements for EPDCCH transmission. The number of ECCEs required for a specific EPDCCH depends on the size of the control information (DCI payload) and the channel coding rate. In this case, the number of ECCEs required for a specific EPDCCH is called an aggregation level (AL).

In the present specification, the number of EREGs constituting ECCE for centralized EPDCCH transmission may be referred to as N _{EREG, L} , and the number of EREGs constituting ECCE for distributed EPDCCH transmission may be _referred to as N _{EREG , D.} In this case, if the maximum number of EREGs that can be used for EPDCCH transmission in one PRB or VRB (Virtual Resource Block) is N _{RB , EREG ,} the number of _ECCEs that can be transmitted through the corresponding PRB (or VRB) is concentrated. In case of type EPDCCH transmission, there are [N _{RB , EREG} / N _{EREG , L} ], and in case of distributed EPDCCH transmission, there are [N _{RB , EREG} / N _{EREG , D} ]. That is, when the number of REs used for other downlink physical signals and physical channels in the PRB (or VRB) is the minimum, the maximum number of ECCEs that can be transmitted through the corresponding PRB is determined according to the aforementioned EPDCCH transmission type. [N _{RB , EREG} / N _{EREG , L} ], and [N _{RB , EREG} / N _{EREG , D} ]. In other words, the number of ECCEs that can be set through one PRB or VRB in any centralized EPDCCH set is called N _{ECCE , L} (= [N _{RB , EREG} / N _{EREG , L} ]), and The number of ECCEs that can be set through one PRB or VRB in a distributed EPDCCH set may be referred to as N _{ECCE , D} (= [N _{RB , EREG} / N _{EREG , D} ]).

값으로써 활용할 수 있다. 즉, 임의의 단말을 위해 할당된 서브프레임의 X개의 자원블럭 쌍(X는 1 이상 전대역의 RB들의 개수 이하의 자연수)으로 이루어진 집중형 혹은 분산형 EPDCCH 셋의 PRB들을 최소 PRB부터 차례대로 0 ~ X-1까지 인덱싱을 하고, 해당 단말을 위한 EPDCCH 전송을 위해 사용된 PRB 중 최소 PRB의 인덱스를 n_PRB(즉, 0≤ n_PRB ≤X-1을 만족하는 자연수)라 할 경우, 해당 n_PRB를 PUCCH ACK/NACK 피드백을 위한 PUCCH 자원 매핑을 위해 사용할 수 있다. 이에 대한 한 예로써,해당 단말의 상향링크 HARQ ACK/NACK 피드백을 위한 PUCCH 자원 매핑을 위한 수학식 5 와 6의

값으로써, 해당 EPDCCH가 집중형 EPDCCH 전송일 경우, n_PRB *[N_{RB , EREG}/N_{REG ,L}]=n_PRB * N_{ECCE ,L}을 대응하고, 해당 EPDCCH가 분산형 EPDCCH 전송일 경우, n_PRB *[N_{RB , EREG}/N_{REG ,D}]=n_PRB *N_{ECCE ,D}을 대응할 수 있다.즉, 임의의 집중형 EPDCCH 셋의 하나의 PRB를 통해 설정되는 ECCE의 개수, N_{ECCE ,L} 및 임의의 분산형 EPDCCH 셋의 하나의 PRB를 통해 설정되는 ECCE의 개수, N_{ECCE ,D}를 적용하면, 해당 단말의 상향링크 HARQ ACK/NACK 피드백을 위한 PUCCH 자원 매핑을 위한 수학식 5 와 6의

값으로써, 해당 EPDCCH가 집중형 EPDCCH 전송일 경우, n_PRB * N_{ECCE ,L}을 대응하고, 해당 EPDCCH가 분산형 EPDCCH 전송일 경우, n_PRB *N_{ECCE ,D}을 대응할 수 있다.Accordingly, any terminal determines the index of the minimum PRB (or VRB) of the PRBs (or VRBs) used for the EPDCCH transmission for the terminal in the centralized or distributed EPDCCH set configured for the terminal. PUCCH Resource Mapping Expressions for Feedback

It can be used as a value. That is, PRBs of a centralized or distributed EPDCCH set composed of X resource block pairs (X is a natural number less than or equal to the number of RBs of one or more full bands) of a subframe allocated for an arbitrary UE are sequentially set from 0 to 0 ~. when indexing to X-1, and the index of the minimum of the PRB used for EPDCCH transmission for the UE PRB n _PRB La (that is, a natural number satisfying 0≤ n _PRB ≤X-1), the n _PRB May be used for PUCCH resource mapping for PUCCH ACK / NACK feedback. As an example, Equations 5 and 6 for PUCCH resource mapping for uplink HARQ ACK / NACK feedback of a corresponding UE

As a value, n _PRB if the EPDCCH is centralized EPDCCH transmission. * [N _{RB , EREG} / N _{REG , L} ] = n _PRB N corresponds to N _{ECCE , L} , and n _PRB when the corresponding EPDCCH is distributed EPDCCH transmission. * [N _{RB , EREG} / N _{REG , D} ] = n _PRB * N _{ECCE , D} may correspond. That is, the number of ECCEs set through one PRB of any centralized EPDCCH set, and the ECCEs set through one PRB of N _{ECCE , L} and any distributed EPDCCH set. When the number of N _{ECCE , D} is applied, Equations 5 and 6 for PUCCH resource mapping for uplink HARQ ACK / NACK feedback of a corresponding UE are applied.

As a value, n _PRB if the EPDCCH is centralized EPDCCH transmission. N corresponds to N _{ECCE , L} , and n _PRB when the corresponding EPDCCH is distributed EPDCCH transmission. * N _{ECCE , D} can be supported.

In summary, the minimum index of the PRB for transmitting control information of the X PRBs (VRBs) constituting the EPDCCH is used as one resource determination element when mapping the PUCCH resource of the ACK / NACK to the PDSCH allocated according to the downlink scheduling information. Can be. In more detail, the product of the minimum index of the PRB and the number of ECCEs that can be set through each of the PRBs may be used as one resource determination element when mapping PUCCH resources of ACK / NACK to the PDSCH allocated according to downlink scheduling information. In this case, the EPDCCH set may be a centralized EPDCCH set or a distributed EPDCCH set.

값이 결정되도록 할 수 있다. 예를 들어 단말의 N번째 브라인드 디코딩을 통해 해당 하향링크 스케줄링 정보를 수신한 경우, 전술한

값으로 N을 적용할 수 있다. In another embodiment of determining an implicit determination parameter, when an arbitrary terminal through the EPDCCH allocated to the data region 520 of the resource block receives the downlink scheduling information, the terminal attempts to receive the corresponding downlink scheduling information. Equations 5 and 6 for PUCCH resource mapping for uplink HARQ ACK / NACK feedback of a corresponding UE as a function of the number of blind decoding

The value can be determined. For example, when the corresponding downlink scheduling information is received through N-th blind decoding of the UE,

You can apply N as the value.

To this end, it is necessary to define a blind decoding procedure of the terminal configured to receive the DCI through the EPDCCH. An EPDCCH transmission type dependent blind decoding method may be defined as an EPDCCH blind decoding procedure of a corresponding UE.

If both the distributed EPDCCH search space and the centralized EPDCCH search space are configured for a terminal on which an EPDCCH is set, perform the blind decoding for the distributed EPDCCH search space first, and then perform the blind decoding for the centralized EPDCCH search space. can do. In this case, the UE performs blind decoding on the distributed EPDCCH search space in the order of ECCE aggregation level 1, 2, 4, 8, etc., and then moves to the centralized EPDCCH discovery space, and then moves to ECCE aggregation level 1, 2, 4, 8, etc. And perform the blind decoding in the order of. On the contrary, it may be defined to perform blind decoding in a centralized EPDCCH search space first manner.

As another method, an aggregation level dependent blind decoding method may be defined. In this case, the blind decoding is performed in the order of ECCE aggregation level 1, 2, 4, 8, and so on. That is, when both the distributed EPDCCH search space and the centralized EPDCCH search space are set in a certain terminal, after performing the blind decoding on the aggregation level 1 of the distributed EPDCCH search space in the order of low aggregation level to high aggregation level, It may be defined to perform the blind decoding for the aggregation level 1 of the EPDCCH transmission type, and then perform the blind decoding in the distributed EPDCCH search space first manner in the same way for the aggregation levels 2, 4, and 8 thereafter. It may be defined to perform in a high aggregation level priority manner in the reverse order.

However, in this case, the order of the corresponding blind decoding is applied to only the downlink scheduling information at once, and the order of the fallback downlink scheduling information of DCI format 1A, which is the fallback downlink scheduling information, is assigned according to the above-described rule. Subsequently, the PDSCH transmission mode may be sequentially numbered for the DCI format.

값으로 적용하도록 할 수 있다. As another embodiment of determining an implicit determination parameter, in case of a UE configured to receive DCI through EPDCCH, ECCE indexing is performed for each UE in a UE-specific search space and the minimum ECCE in which downlink scheduling information is transmitted. Index above

Can be applied as a value.

값이 결정되는 전술한 실시예와 유사한 방법으로 EPDCCH 전송 타입에 따른 검색 공간별로 인덱스를 정의할 수 있다. 즉, 임의의 단말을 위한 EPDCCH 검색 공간으로서 각각 M개(M은 1 이상 전대역의 PRB들의 개수 이하의 자연수)의 PRB(들)가 분산형 EPDCCH 검색 공간으로서 할당되고, L개(L은 1 이상 전대역의 PRB들의 개수 이하의 자연수)의 PRB(들)가 집중형 EPDCCH 검색 공간이 설정된 경우, 각각 M값에 따라 분산형 EPDCCH 검색 공간 영역에 생성되는 ECCE의 수 n_{ECCE , D}값 및 L값에 따라 집중형 EPDCCH 검색 공간 n_{ECCE ,L}값이 결정된다. 이에 따라 해당 단말의 ECCE 인덱싱 방법으로서 분산형 EPDCCH 검색 공간의 ECCE들에 대해 0 ~ (n_{ECCE ,D} - 1)까지 인덱싱을 한 후, 집중형 EPDCCH 검색 공간을 구성하는 ECCE들에 대해 이어서 n_{ECCE ,D} ~ (n_{ECCE ,D} + n_{ECCE ,L} - 1)의 순서로 ECCE 인덱스를 정의할 수 있다.
ECCE indexing for this is a function of the number of blind decoding

An index may be defined for each search space according to the EPDCCH transmission type by a method similar to the above-described embodiment in which a value is determined. That is, M EPBs (M is a natural number less than or equal to the number of full-band PRBs) are allocated as distributed EPDCCH search spaces as an EPDCCH search space for an arbitrary terminal, and L (L is 1 or more). When the centralized EPDCCH search space of the PRB (s) of the full band) is less than or equal to the number of PRBs in the full band, the number of ECCEs generated in the distributed EPDCCH search space region according to the M value, respectively, is n _{ECCE , D} value and L value. The centralized EPDCCH search space n _{ECCE , L} value is determined accordingly. Accordingly, as the ECCE indexing method of the UE, indexing is performed from 0 to (n _{ECCE , D} -1) for ECCEs of the distributed EPDCCH search space, and then n _ECCE for ECCEs constituting the centralized EPDCCH search space. ECCE indexes can be defined in the order of _{, D} ~ (n _{ECCE , D} + n _{ECCE , L} -1).

Alternatively, ECCE indexing may be separately performed on the distributed EPDCCH search space and the centralized EPDCCH search space. In this case, an ECCE index is defined from 0 to (n _{ECCE , D} -1) for ECCEs in the distributed EPDCCH search space, followed by 0 for ECCEs constituting a separate centralized EPDCCH search space. ECCE indexes can be defined in the order of (n _{ECCE , L} -1).

In addition, a plurality of EPDCCH sets configured by a group of X PRBs (X is a natural number less than or equal to the number of PRBs of one or more full bands) for each EPDCCH transmission type for an arbitrary UE or for any EPDCCH transmission type Similarly, in case of allocation, EPDCCH or ECCE indexing may be separately performed for each EPDCCH set. In this case, the number of PRBs constituting one EPDCCH set may be X = (1), 2, 4, 8 for the centralized type and 2, 4, 8, (16) for the distributed type.

For example, any of the terminal is set to receive DCI through EPDCCH (e.g. to claim EPDCCH set # 1 ~ EPDCCH set #K _L constituting the convergent EPDCCH search space for one UE (UE1) K _L of EPDCCH A set may be allocated, and K _D EPDCCH sets may be allocated from EPDCCH set # 1 to EPDCCH set #K _D constituting a distributed EPDCCH search space, in which case, each of the centralized type EPDCCH set #n may be allocated. In case of ECCEs, ECCE indexing is performed from 0 to (X _Ln * N-1) for each n = 1,…, K _L , and each m = for ECCEs constituting distributed EPDCCH set #m. ECCE indexing takes place from 0 to (X _Dm * N-1) for 1,…, K _D , where each centralized EPDCCH set n = 1,…, K _L And distributed EPDCCH set n = 1,... , X _Ln for the K _D denotes a number of the aforementioned PRB (number of PRBs), X values making up the concentration-type EPDCCH set #n, X _Dm is the aforementioned PRB constituting the distributed EPDCCH set #m The number of PRBs and the X value.

In addition, N is the number of ECCEs constituting one PRB in the corresponding server frame, and N = 2 (if eight EREGs constitute one ECCE) depending on the number of EREGs constituting one ECCE in the corresponding subframe, or It has a value of 4 (when four EREGs constitute one ECCE).

FIG. 7 illustrates one centralized EPDCCH set with K _L = 1 and one distributed EPDCCH set with K _D = 1 when X = 2 and N = 4.

A Referring to Figure 7 also to the case of X = 2 and N = 4. 7 (a) has K _L = 1, one of the centralized EPDCCH set and K _D = 1, which is one of a distributed EPDCCH set and K _D = 1 ECCE indexing may be performed separately for each distributed EPDCCH set.

The ECCEs of the centralized EPDCCH set are indexed by ECCE # 0 to 7. At this time, since the centralized EPDCCH set, one ECCE is located in one PRB pair. For example, all of the ECCE # 0, for example, all of the EREGs constituting the ECCE are located in the same PRB #n.

It indexes with ECCE # 0 to 7 for ECCEs constituting one distributed EPDCCH set. In this case, since the distributed EPDCCH set, one ECCE is located in two PRB pairs. For example, one half of ECCE # 0, ECCE (1/2) # 0, for example, half of the EREGs constituting ECCE are located in PRB #m and the other half ECCE (2/2) # 0, for example ECCE. The other half of the constituent EREGs is located in PRB # m + N.

Here, the order of ECCE indexing in one centralized EPDCCH set is indexed sequentially from the ECCE located at the minimum frequency position according to the frequency position constituting each ECCE, or configures the corresponding EPDCCH set. Perform ECCE indexing from 0 to (X _Lm * N-1) in order from ECCE consisting of the minimum subcarrier indices of the PRB having the minimum PRB index for a group of X PRBs Among the PRBs having a minimum PRB index among a group of X PRBs constituting the EPDCCH set, the ECE having the smallest EREG index constituting each ECCE or the EREG index constituting the ECCE is small. You can index from 0 to (X _Lm * N-1) in order from the smallest ECCE. Likewise, one distributed EPDCCH set may be indexed in the same order as that of the aforementioned concentrated EPDCCH set.

값으로 적용하도록 할 수 있다.As another embodiment of determining an implicit determination parameter, in case of a UE configured to receive DCI through EPDCCH, ECCE indexing is performed for each UE in a UE-specific search space and the minimum ECCE in which downlink scheduling information is transmitted. Index above

Can be applied as a value.

In case of a UE configured to receive DCI through EPDCCH as an ECCE indexing method for this purpose, ECCE indexing according to the resource block (s) allocated for transmission of EPDCCH for the UE and the EPDCCH transmission type in the resource block (s). Can be done.

For example, if the maximum number of concentrated ECCEs that can be transmitted through one PRB is L _max , the corresponding L _max is L _max = [as described in an embodiment of determining the implicit decision parameter described above. N _{RB , EREG} / N _{ECCE , L} ].

라 하면, 해당 PRB(또는 VRB)의 집중형 ECCE 인덱스는 최소 ECCE부터 순서대로

로 인덱스를 부여하도록 할 수 있다. Assuming this, k consecutive PRBs (or VRBs) are allocated from PRB (or VRB) #n to PRB (or VRB) # (n + k-1) for centralized EPDCCH transmission for an arbitrary UE. The number of concentrated ECCEs defined by the k PRBs (or VRBs)

In this case, the centralized ECCE index of the PRB (or VRB) is in order from the minimum ECCE.

Index can be assigned.

라 하면, 해당 PRB(또는 VRB)의 분산형 ECCE 인덱스는 최소 ECCE부터 순서대로

로 인덱스를 부여하도록 할 수 있다.On the other hand, when m distributed or consecutive PRBs (or VRBs) are allocated for distributed EPDCCH transmission for a corresponding UE, the number of distributed ECCEs defined through corresponding PRBs is determined.

In this case, the distributed ECCE index of the PRB (or VRB) is in order from the minimum ECCE.

Index can be assigned.

In addition, a case in which the various methods of determining the implicit decision parameters described above are differently applied according to the type (intensive or distributed) of the EPDCCH set may be included in the scope of the present invention. For example, when an EPDCCH for a corresponding UE is transmitted through a distributed EPDCCH set, the minimum of a control channel element in which the corresponding EPDCCH is transmitted as an implicit decision parameter of a PUCCH transmission resource mapping equation for HARQ ACK / NACK feedback of the corresponding UE. When the index is used and the EPDCCH for the corresponding UE is transmitted through the centralized EPDCCH set, each of the minimum indexes and PRBs of the PRB is used as an implicit decision parameter of the PUCCH transmission resource mapping equation for HARQ ACK / NACK feedback of the corresponding UE. The product of the number of ECCEs that can be set through may be used.

Hereinafter, the implicit determination offset, offset _i , which is one of the component of PUCCH resource determination, will be described in detail.

In one embodiment of determining an implicit decision offset, an HARQ ACK / NACK PUCCH resource mapping function for any UE configured to receive a DCI through an EPDCCH is an implicit decision offset value in addition to the implicit decision parameter and the explicit decision parameter. The offset _i value can be introduced. As such, when an implicit decision offset, offset _i is introduced, the corresponding value is the DM RS antenna port number of the low ECCE, aggregation level, C-RNTI of the corresponding UE, and the corresponding downlink scheduling information for the corresponding UE is transmitted. It can be determined as a function value that takes as a parameter a subset of parameters such as the system band of the cell, N _PRB, and the like.

As an embodiment, a hashing function for determining a UE-specific search space of a UE for each aggregation level of an existing legacy PDCCH located in a control region may be reused. In this case, a hash function for determining a search space of the terminal according to the aggregation level AL

에서 임의의 서브프레임 k에서 PDCCH의 CCE의 총수(total number of CCE), N_{CCE ,K} 값만 N_PRB로 대체하여 적용할 수 있다. 이때 Yk는 공통검색공간 또는 단말 특정 검색공간의 집합레벨에 따른 변수이고, m'는 PDCCH 후보들의 개수 및 캐리어 지시자필드값(Carrier Indicator Field)에 의해 결정되고, L은 집합 레벨(AL)을 의미하고 i는 0,…,L-1이다. or

In N subband k, the total number of CCEs, N _{CCEs , and K} values of the PDCCHs may be replaced by N _PRBs . In this case, Yk is a variable according to the aggregation level of the common search space or the UE-specific search space, and m 'is determined by the number of PDCCH candidates and the carrier indicator field value, and L means the aggregation level (AL). And i is 0,… , L-1.

Additionally, the offset value may vary depending on whether the common search space for the corresponding UE is set in the legacy PDCCH region located in the control region or in the EPDCCH region. For example, when the common search space (CSS) of the legacy PDCCH is reused, 16, which is the number of CCEs constituting the legacy PDCCH, may be added to an offset value.

, 명시적 결정 파라미터(explicitly determined parameter),

및 묵시적 결정 오프셋(implicitly determined offset), offset_i 각각의 다양한 실시예들을 설명하였다. Implicitly determined parameter which is a component of PUCCH resource determination when mapping PUCCH resources by corresponding antenna port for HARQ ACK / NACK feedback,

, Explicitly determined parameter,

And various embodiments of implicitly determined offset, offset _i, respectively.

In this case, all or some of the components of the PUCCH resource determination element when mapping the PUCCH resource for each antenna port for the HARQ ACK / NACK feedback in the form of all combinations or part of the method according to the present invention. Resource mapping method, may be included in the device.

로 각각의 EPDCCH 셋별로 별도로 ECCE 인덱싱을 수행하고 하향링크 스케줄링 정보가 전송된 최소 ECCE 인덱스를 적용할 수 있다. Specifically, an implicit decision parameter, which is one of a component of PUCCH resource determination,

As a result, ECCE indexing may be performed separately for each EPDCCH set, and a minimum ECCE index including downlink scheduling information may be applied.

8 is a flowchart illustrating a control information transmission method of a transmission / reception point for transmitting control information for a specific terminal through a data area of a physical resource block pair of a specific subframe according to an embodiment of the present invention.

Referring to FIG. 8, an embodiment of the present invention in terms of a transmission / reception point is a method of transmitting control information of a transmission / reception point for transmitting control information for a specific terminal through a data region of a physical resource block pair of a subframe. Allocating at least one set of Enhanced Physical Downlink Control Channels (EPDCCHs) configured of X resource block pairs (X is a natural number less than or equal to the number of RBs of one or more full bands) of the subframe (800). And transmitting control information to a specific terminal through at least one of at least two enhanced control channel elements indexed for each downlink control channel set (S810). X = 2, 4, 8, (16), and (32) in X resource block pairs that constitute one EPDCCH set, but are not limited thereto. In this case, the EPDCCH set may or may not be configured with a maximum of 16 resource block pairs according to the type of the EPDCCH set. For example, a distributed EPDCCH set may consist of 16 resource block pairs, but a centralized EPDCCH set may consist of up to 8 resource block pairs.

9 is a flowchart illustrating a PUCCH resource mapping method of a terminal receiving downlink scheduling information through an EPDCCH according to another embodiment.

Referring to FIG. 9, in the terminal side, another embodiment is a PUCCH resource mapping method 900 of a terminal, wherein at least one downlink control configured of X resource block pairs (X is a natural number greater than 1) of a subframe Receive control information on downlink scheduling information from the base station through one of at least two enhanced control channel elements indexed for each downlink control channel set for an enhanced physical downlink control channel (EPDCCH) set Mapping PUCCH resources by using the minimum index of the control channel element as one element when mapping the PUCCH resources of the ACK / NACK with respect to the allocated Physical Downlink Shared Channel (PDSCH) according to the step S910 and downlink scheduling information (S920). The PUCCH resource mapping method 900 according to another embodiment may further include transmitting a PUCCH resource mapped PUCCH to a transmission / reception point in operation S920 (S930).

As described above, X = 2, 4, 8, 16, and 32 in the X resource block pairs that constitute one EPDCCH set, but are not limited thereto. In this case, the EPDCCH set may or may not be configured with a maximum of 16 resource block pairs according to the type of the EPDCCH set. For example, a distributed EPDCCH set may consist of 16 resource block pairs, but a centralized EPDCCH set may consist of up to 8 resource block pairs.

10 is a flowchart summarizing the entire process of downlink transmission of a transmission and reception point and uplink transmission of a terminal.

Referring to FIG. 10, a transmission / reception point, for example, the eNB 110 may control information including downlink scheduling information through an EPDCCH of a data region of a physical resource block pair of a subframe and the downlink scheduling. The PDSCH indicated by the information is transmitted downlink to the first terminal 120 (S1010).

In this case, as described with reference to FIG. 8, the eNB 110 transmits control information including downlink scheduling information through an EPDCCH of a data region of a physical resource block pair of a specific subframe. Allocate at least one centralized EPDCCH set consisting of X frames, for example, two physical resource block pairs. In this case, as described with reference to FIG. 7, the EPDCCH set may allocate n centralized EPDCCH sets and m distributed EPDCCH sets, but it is exemplified as one centralized EPDCCH set for simplicity.

Next, the eNB 110 indexes at least two enhanced control channel elements per set. For example, ECCEs constituting the centralized EPDCCH set may be indexed separately for at least one centralized EPDCCH set composed of two physical resource block pairs. As described with reference to FIG. 7, the indexing of ECCEs for each EPDCCH set when n centralized EPDCCH sets and m distributed EPDCCH sets are allocated is described above with reference to FIG. 7.

Next, control information may be assigned to at least one of the indexed control channel elements, for example, ECCE # 4 and 5, and the control information may be transmitted to a specific terminal. In this case, when the control information includes the downlink scheduling information, the PDSCH indicated by the downlink scheduling information is also transmitted downlink to the first terminal 120 in step S1010.

In step S1010, the first terminal 120 receives control information including downlink scheduling information and a PDSCH indicated by the downlink scheduling information from the eNB 110 through the EPDCCH.

Subsequently, the first terminal 120 transmits a scheduling request (SR) through a PUCCH, a HARQ (ACK) for the received downlink data channel transport block, and a report of a UE related to a downlink channel state. In operation S1020, uplink data may be uplinked through a PUSCH. In this case, as shown in FIG. 2, the terminal 120 may perform uplink transmission to the eNB 110, which is the first transmission / reception point. Meanwhile, as shown in FIG. 3, the second terminal 122 may perform uplink transmission to the RRH 112 which is the second transmission / reception point.

In this case, how control information according to each PUCCH format is mapped to a resource block (RB) is as described above with reference to FIG. 4.

(수학식 3과 4의

에 해당) 명시적 결정 파라미터(explicitly determined parameter),

(수학식 3과 4의

) 및 묵시적 결정 오프셋(implicitly determined offset), offset_i을 포함할 수 있다. 전술한 예와 같이 해당 PDSCH 수신에 대한 HARQ ACK/NACK 피드백을 위한 해당 안테나 포트별 PUCCH 자원 매핑은 각각 아래의 수학식 5과 6에 의해 결정될 수도 있다. In step S1020, the terminal 120 receives the HARQ ACK / NACK feedback for the PDSCH reception of the terminal through which the PDSCH allocation information for the terminal is transmitted through the downlink scheduling information through the EPDCCH allocated to the data region of the resource block Implicitly determined parameter determined by ECCE as a component of PUCCH resource determination when mapping PUCCH resources per corresponding antenna port for

(Equation 3 and 4

Explicitly determined parameter,

(Equation 3 and 4

) And an implicitly determined offset, offset _i . As described above, the PUCCH resource mapping for each antenna port for HARQ ACK / NACK feedback on the PDSCH reception may be determined by Equations 5 and 6, respectively.

At least one of two enhanced control channel elements indexed by three, for example, downlink scheduling information included in this control information received in ECCE # 4 and 5, as shown in FIG. In the PUCCH resource mapping for each antenna port for HARQ ACK / NACK feedback for PDSCH reception, a PUCCH resource may be mapped using a minimum index of ECCEs, for example, ECCE # 4 as one element. For example, when ECCE # 4 is used as an implicit decision parameter of Equations 5 and 6, PUCCH may be mapped to PUCCH resource m = 2.

11 is a diagram illustrating a configuration of a transmission and reception point according to another embodiment.

Referring to FIG. 11, a transmission / reception point 1100 according to another embodiment includes a controller 1110, a transmitter 1120, and a receiver 1130.

The control unit 1110 controls the overall operation of the base station according to the PUCCH resource mapping method for the uplink HARQ ACK / NACK feedback for the terminal configured to receive the DCI over the EPDCCH required to perform the above-described present invention.

The control unit 1110 transmits X resource block pairs (X is 1) when transmitting control information of a transmission / reception point for transmitting control information for a specific terminal through a data region of a physical resource block pair of a subframe. Allocate at least one Enhanced Physical Downlink Control Channel (EPDCCH) set consisting of a number less than or equal to the total number of PRBs of the full band, and at least two Control Channel elements per downlink control channel set (Enhanced Control Channel). Elements) and control information is assigned to at least one of the indexed control channel elements.

As described above, X = 2, 4, 8, 16, and 32 in the X resource block pairs that constitute one EPDCCH set, but are not limited thereto. In this case, the EPDCCH set may or may not be configured with a maximum of 16 resource block pairs according to the type of the EPDCCH set. For example, a distributed EPDCCH set may consist of 16 resource block pairs, but a centralized EPDCCH set may consist of up to 8 resource block pairs.

The transmitter 1120 and the receiver 1130 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention. For example, the transmitter 1120 transmits the above-described control information to a specific terminal through an EPDCCH of a data region of a resource block pair of a specific subframe.

12 is a diagram illustrating a configuration of a user terminal according to another embodiment.

Referring to FIG. 12, the user terminal 1200 according to another embodiment includes a receiver 1210, a controller 1220, and a transmitter 1230.

The receiver 1210 receives downlink control information, data, and a message from a base station through a corresponding channel. The receiver 1210 is configured to index at least one downlink control channel set for at least one enhanced physical downlink control channel set consisting of X resource block pairs (X is a natural number greater than 1) of a subframe. Receive control information for downlink scheduling information from one transmission / reception point through one of two control channel elements (Enhanced Control Channel Elements).

In addition, the control unit 1220 controls the overall operation of the base station according to the PUCCH resource mapping method for the uplink HARQ ACK / NACK feedback for the terminal configured to receive the DCI through the EPDCCH required to perform the above-described present invention. The controller 1220 uses the minimum index of the control channel element as one element to map the PUCCH resources when mapping the PUCCH resources of the ACK / NACK for the physical downlink shared channel (PDSCH) allocated according to the downlink scheduling information.

The transmitter 1230 transmits downlink control information, data, and a message to a base station through a corresponding channel.

The description of the content specification relating to the standard specification mentioned in the above-mentioned embodiment is omitted for the sake of simplicity and constitutes 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 scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

Claims (24)

A control information transmission method of a transmission / reception point for transmitting control information for a specific terminal through a data region of a physical resource block pair of a subframe, wherein X resource block pairs (X is one or more full bands) of the subframe Allocating at least one Enhanced Physical Downlink Control CHannel set consisting of a natural number equal to or less than the number of RBs of the RB; And transmitting the control information to the specific terminal through at least one of the at least two enhanced control channel elements indexed for each of the downlink control channel sets. The method of claim 1,
The control channel elements (Enhanced Control Channel Elements) are each composed of four or eight resource element groups (Resource Element Groups), each of the four or eight resource element groups constituting each control channel element is a physical Control information transmission method of a transmission and reception point, characterized in that located in the resource block pair or two or more physical resource block pair. The method of claim 1,
The control information includes downlink scheduling information, and the physical downlink shared PDSCH assigned the minimum index of the control channel element indexed for each downlink control channel cell for transmitting the control information according to the downlink scheduling information A method of transmitting control information of a transmission / reception point, characterized in that it is used as one resource determination element when mapping PUCCH (Physical Uplink Control Channel) resources of ACK / NACK to a channel. The method of claim 3,
The downlink control channel set includes a centralized downlink control channel set in which resource element groups constituting each control channel element are located in one physical resource block pair, and resource element groups constituting each control channel element are two or more physical resources. Method of transmitting control information of a transmission and reception point, characterized in that the distributed downlink control channel set of the distributed downlink control channel set located in the block pair. The method of claim 1,
In the X resource block pairs of the subframe, X is one of 2, 4, 8, 16, the control information transmission method of the transmission and reception points. The method of claim 1,
The minimum index of the resource block pair for transmitting the control information among the X resource block pairs constituting the downlink control channel set is one when mapping PUCCH resources of ACK / NACK to the PDSCH allocated according to the downlink scheduling information. Control information transmission method of a transmission and reception point, characterized in that used as a resource determination element. The method according to claim 6,
One resource when mapping the PUCCH resource of the ACK / NACK to the PDSCH allocated according to the downlink scheduling information is the product of the minimum index of the resource block pair and the number of control channel elements that can be set through each of the resource block pairs Control information transmission method of a transmission and reception point, characterized in that used as a determining element. The method of claim 7, wherein
The downlink control channel set includes a centralized downlink control channel set in which resource element groups constituting each control channel element are located in one physical resource block pair, and resource element groups constituting each control channel element are two or more physical resources. Method of transmitting control information of a transmission and reception point, characterized in that the centralized downlink control channel set of the distributed downlink control channel set located in the block pair. Indexing by at least one downlink control channel set for at least one set of enhanced physical downlink control channels including X resource block pairs (X is a natural number less than or equal to the number of RBs of at least one full band) of a subframe Receiving control information on downlink scheduling information from at least one transmission control point through at least one of the at least two enhanced control channel elements; And
When configuring the physical uplink control channel (PUCCH) resource mapping of the ACK / NACK to the physical downlink shared channel (PDSCH) allocated according to the downlink scheduling information, the minimum index of the control channel element or the downlink control channel set And mapping a PUCCH resource using a minimum index of a resource block pair for transmitting the control information among X resource block pairs as one resource determination element. 10. The method of claim 9, wherein the enhanced control channel elements are each composed of four or eight resource element groups, and four or eight resources constituting each control channel element. The element groups are located in one physical resource block pair or uplink control channel resource mapping method of a terminal, characterized in that located in two or more physical resource block pair. 10. The method of claim 9,
When the PUCCH resource is mapped using the minimum index of the control channel element as one resource determination element,
The downlink control channel set includes a centralized downlink control channel set in which resource element groups constituting each control channel element are located in one physical resource block pair, and resource element groups constituting each control channel element are two or more physical resources. The uplink control channel resource mapping method of a terminal, characterized in that the distributed downlink control channel set of the distributed downlink control channel set located in the block pair. The method of claim 9, wherein X in the X resource block pairs of the subframe is one of 2, 4, 8, and 16. The method of claim 9, wherein when the PUCCH resource is mapped using the minimum index of the resource block pair as one resource determination element,
The uplink control channel of the UE, wherein the PUCCH resource is mapped using a product of the minimum index of the resource block pair and the number of control channel elements that can be set through each of the resource block pairs as one resource determination element. Resource mapping method. 14. The method of claim 13,
The downlink control channel set includes a centralized downlink control channel set in which resource element groups constituting each control channel element are located in one physical resource block pair, and resource element groups constituting each control channel element are two or more physical resources. The uplink control channel resource mapping method of a terminal characterized in that the centralized downlink control channel set of the distributed downlink control channel set located in the block pair. A transmission / reception point for transmitting control information of a transmission / reception point for transmitting control information for a specific terminal through a data region of a physical resource block pair of a subframe,
A controller for allocating at least one Enhanced Physical Downlink Control CHannel set composed of X resource block pairs (X is a natural number less than or equal to the number of RBs of one or more full bands) of the specific subframe; And
And a transmitter for transmitting the control information to the specific terminal through at least one of at least two enhanced control channel elements indexed for each of the downlink control channel sets. 16. The method of claim 15,
The control information includes downlink scheduling information,
The minimum index of the control channel element indexed for each downlink control channel cell for transmitting the control information is PUCCH (Physical Uplink) of ACK / NACK for the PDSCH (Physical Downlink Shared Channel) allocated according to the downlink scheduling information. Control Channel) Transceiver point, characterized in that used as a resource determination element when mapping resources. 17. The method of claim 16,
The downlink control channel set includes a centralized downlink control channel set in which resource element groups constituting each control channel element are located in one physical resource block pair, and resource element groups constituting each control channel element are two or more physical resources. A transmission and reception point, characterized in that the distributed downlink control channel set of the distributed downlink control channel set located in the block pair. 16. The method of claim 15,
In the X resource block pairs of the subframe, X is one of 2, 4, 8, 16 transmission and reception point, characterized in that. 16. The method of claim 15,
The product of the minimum index of the resource block pair for transmitting the control information among the X resource block pairs constituting the downlink control channel set and the number of control channel elements that can be set through each of the resource block pairs is the downlink. Transmitting and receiving point, characterized in that used as one resource determination element in the PUCCH resource mapping of the ACK / NACK for the assigned PDSCH according to the link scheduling information. 20. The method of claim 19,
The downlink control channel set includes a centralized downlink control channel set in which resource element groups constituting each control channel element are located in one physical resource block pair, and resource element groups constituting each control channel element are two or more physical resources. Transmitting and receiving point, characterized in that the centralized downlink control channel set of the distributed downlink control channel set located in the block pair. Indexing by at least one downlink control channel set for at least one set of enhanced physical downlink control channels including X resource block pairs (X is a natural number less than or equal to the number of RBs of at least one full band) of a subframe A receiver configured to receive control information on downlink scheduling information from at least one transmission / reception point through at least one of the at least two enhanced control channel elements; And
When configuring the physical uplink control channel (PUCCH) resource mapping of the ACK / NACK to the physical downlink shared channel (PDSCH) allocated according to the downlink scheduling information, the minimum index of the control channel element or the downlink control channel set The PUCCH resource is mapped using a product of a minimum index of a resource block pair for transmitting the control information among X resource block pairs and the number of control channel elements that can be set through each of the resource block pairs as one resource determination element. Terminal comprising a control unit. 22. The method of claim 21,
When the PUCCH resource is mapped using the minimum index of the control channel element as one resource determination element,
The downlink control channel set includes a centralized downlink control channel set in which resource element groups constituting each control channel element are located in one physical resource block pair, and resource element groups constituting each control channel element are two or more physical resources. And a distributed downlink control channel set among the distributed downlink control channel sets located in the block pair. 22. The method of claim 21,
In the X resource block pairs of the subframe, X is one of 2, 4, 8, 16, characterized in that the terminal. 22. The method of claim 21, wherein the PUCCH resource is mapped using a product of the minimum index of the resource block pair and the number of control channel elements that can be set through each of the resource block pairs as one resource determination element.
The downlink control channel set includes a centralized downlink control channel set in which resource element groups constituting each control channel element are located in one physical resource block pair, and resource element groups constituting each control channel element are two or more physical resources. The uplink control channel resource mapping method of a terminal characterized in that the centralized downlink control channel set of the distributed downlink control channel set located in the block pair.

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