KR20150017537A - Method and apparatus of management of epdcch considering nct in wireless communication system - Google Patents

Abstract

The present invention relates to a method and an apparatus for managing an EPDCCH in consideration of NCT in a wireless communications system. The method for managing an EPDCCH comprises: a step of determining a reference n_(EPDCCH) value based on n_(EPDCCH) values of multiple PRB pairs configured in a single EPDCCH set; a step of generating an enhanced physical downlink control channel (EPDCCH) based on the reference n_(EPDCCH) value; and a step of transmitting the generated EPDCCH to a terminal. According to the present invention, a base station and a terminal can smoothly perform the transmission and reception of an EPDCCH through an NCT cell. In addition, even if the number of available resource elements for the PRB pairs configured in the single EPDCCH set is different from each other, the base station and the terminal can efficiently perform the transmission and reception of an EPDCCH through the NCT cell without significantly changing the existing EPDCCH design (for example, hashing function, blind decoding table, and so on).

Description

Technical Field [0001] The present invention relates to a method and apparatus for operating an EPDCCH considering an NCT in a wireless communication system,

The present invention relates to wireless communication, and more particularly, to a method and apparatus for operating an EPDCCH in consideration of an NCT in a wireless communication system.

In the wireless communication system, an extended physical downlink control channel (EPDCCH: Extended-PDCCH) may be used for the purpose of expanding the capacity of the PDCCH in addition to the physical downlink control channel (PDCCH). EPDCCH may also be referred to as an enhanced physical downlink control channel. Like the PDCCH, EPDCCH can be transmitted in a special subframe as well as a normal subframe.

On the other hand, in a conventional multiple component carrier system using an element carrier (CC), the versatility of the physical layer is emphasized. Therefore, in the multi-element carrier system, there is still a problem such that control area redundancy and common signal overhead still exist, thereby reducing resources for the data signal and unnecessary loss in terms of spectral efficiency. Accordingly, new carrier types (NCTs) are being considered for efficient operation in next generation wireless communication systems.

In the NCT, a reference signal (RS) for downlink control channel or channel estimation is provided within a range where performance is not degraded or minimized compared with a legacy carrier type (LCT) Can be removed or reduced. This is to obtain maximum data transmission efficiency. An existing carrier wave is called a backward compatible carrier type (BCCT) by distinguishing it from this NCT.

The NCT may include a non-standalone NCT and a standalone NCT. A non-standalone NCT is an NCT that can not exist in a single cell form and can exist in the form of a secondary serving cell (SCell) when a primary serving cell (PCell) exists. On the other hand, a standalone NCT is an NCT that can exist in the form of a single cell (e.g., an order cell).

In this NCT, a CRS for demodulation other than a reference signal (TRS: Tracking RS or RCRS: Reduced CRS) used for synchronization may not be transmitted, and a physical downlink control channel (PDCCH) , A Physical HARQ Indicator CHannel (PHICH), and a Physical Control Format Indicator CHannel (PCFICH) may be removed or replaced with other types of channels.

According to the prior art, a PDCCH scrambled by a SI-RNTI is used for transmission of system information. However, since the common search space based on the CRS is not defined in the NCT, the PDCCH can not be used for transmission of the system information. If the system bandwidth (BW) is 1.5 MHz with 6 PRB (Physical Resource Block) pairs, the synchronous HARQ operation on the PUSCH on the NCT must be upgraded A link grant (UL grant) must be transmitted, and an EPDCCH must be transmitted for this purpose. Further, even when the system bandwidth is 3, 5, 10, 15, or 20 MHz or the like, the setting of the EPDCCH transmission PRB pair and the subframe on the central 6 PRB pair must be received by the upper signaling. The EPDCCH transmission should be considered.

On the other hand, when one PRB set for the EPDCCH is set to at least one of the middle 6 PRB pairs and one EPDCCH candidate is scheduled for the corresponding PRB pair, available) REs (n _EPDCCH ). In addition, when the PRB to which the PRS (Positioning Reference Signal) is transmitted and the PRB to which the EPDCCH can be transmitted overlap, the EPDCCH PRB pairs may have different n _EPDCCH values. Therefore, it is determined that the UE should perform blind decoding for the EPDCCH based on a certain value of n _EPDCCH , and further operation of the UE and the base station is required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an EPDCCH operating method and an apparatus thereof that consider an NCT in a wireless communication system.

Another object of the present invention is to change the definition of n _EPDCCH in consideration of NCT.

A further technical object of the present invention is to provide a method for determining a reference n _EPDCCH value.

Another aspect of the present invention is to provide a method of setting an nEDPCCH value for a PRB pair set in one EPDCCH set.

According to an aspect of the present invention, there is provided a method for transmitting a control channel by a base station in a NCT (New Carrier Type) based wireless communication system. A method of transmitting the control channel is based on the value of n _EPDCCH plurality of PRB pairs to be set in one of three EPDCCH, n _EPDCCH as a reference Determining a value of the n _EPDCCH Generating an Enhanced Physical Downlink Control Channel (EPDCCH) based on the value of the Physical Downlink Control Channel (EPDCCH), and transmitting the generated EPDCCH to the UE.

According to another aspect of the present invention, there is provided a method of receiving a control channel by a terminal in an NCT-based wireless communication system. The method of receiving the control channel includes receiving an RRC (Radio Resource Control) message, receiving n _{EPDCCHs serving as} a reference of PRB pairs set in one EPDCCH set based on the received RRC message, Recognizing a value of the n _EPDCCH Recognizing a resource element for the EPDCCH based on a value of the EPDCCH, and receiving the EPDCCH on a resource element for the recognized EPDCCH.

According to another aspect of the present invention, there is provided a base station for transmitting a control channel in an NCT-based wireless communication system. Based on n _EPDCCH values of a plurality of pairs of PRBs set in one EPDCCH set, the base station calculates n _EPDCCH An RRC processing unit for determining a value of the n _EPDCCH A PHY processor for generating an Enhanced Physical Downlink Control Channel (EPDCCH), and a transmitter for transmitting the generated EPDCCH to a mobile station.

According to another aspect of the present invention, there is provided a terminal for receiving a control channel in an NCT-based wireless communication system. The UE includes a receiver for receiving an RRC (Radio Resource Control) message, an n _{EPDCCH for serving as} a reference of PRB pairs set in one EPDCCH set based on the received RRC message, And an RRC processing unit for recognizing a value of the n _EPDCCH And a PHY processor for recognizing a resource element for the PDCCH based on the received EPDCCH value, wherein the receiver receives the EPDCCH on the resource element for the EPDCCH.

According to the present invention, the base station and the terminal can smoothly perform EPDCCH transmission / reception through the NCT cell. Also, even when the number of available resource elements of the PRB pairs set in one EPDCCH set is different, the EPDCCH transmission / reception can be efficiently performed on the NCT cell without significantly changing the existing EPDCCH design (for example, a hashing function and a blind decoding table) Can be performed.

1 is a block diagram illustrating a wireless communication system.
2 is a diagram showing RRC parameters for setting the number of PRB pairs defined in each EPDCCH set.
3A-3E illustrate examples of EREG (Enhanced Resource Element Group) mapping of PRB pairs according to an embodiment.
4A is an exemplary diagram illustrating local transmission of an EPDCCH, and FIG. 4B is an exemplary diagram illustrating distributed transmission of an EPDCCH.
5 is a diagram showing an FDD frame structure.
Figures 6 and 7 illustrate the case where the available REs of two different EPDCCH PRB pairs are unbalanced.
8 is a diagram showing criteria that the downlink resource elements for n _EPDCCH satisfy.
9 is a diagram showing examples of PRB pairs having different n _EPDCCH values.
10 shows a case where four pairs of PRBs are set in one EPDCCH set.
11 shows another example in which four pairs of PRBs are set in one EPDCCH set.
12 is a flowchart illustrating an EPDCCH transmission / reception process between a UE and a BS according to an exemplary embodiment of the present invention.
13 is a block diagram illustrating a base station and a terminal according to an exemplary embodiment of the present invention.

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

The present invention will be described in the context of a communication network. A task in a communication network may be performed in a process of controlling a network and transmitting data in a system (e.g., a base station) that manages the communication network, Work can be done.

According to one embodiment of the present invention, 'transmitting a control channel' can be interpreted as meaning that control information is transmitted through a specific channel. Here, the control channel includes, for example, a physical downlink control channel (PDCCH), an extended PDCCH (EPDCCH), or a physical uplink control channel (PUCCH) .

1 is a block diagram illustrating a wireless communication system. This may be a network structure of an Evolved-Universal Mobile Telecommunications System (E-UMTS). The E-UMTS system may be called LTE (Long Term Evolution) or LTE-A (advanced) system. Wireless communication systems are widely deployed to provide various communication services such as voice transmission, packet data transmission, and the like.

On the other hand, there is no limitation on a multiple access technique applied to a wireless communication system. (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier-FDMA , OFDM-CDMA, and the like can be used.

Here, TDD (Time Division Duplex) scheme in which uplink and downlink transmission are transmitted using different time periods or FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies may be used .

Referring to FIG. 1, a wireless communication system includes at least one base station (BS) 20 that provides a control plane and a user plane to a terminal.

A user equipment (UE) 10 may be fixed or mobile and may be a mobile station, an AMS (advanced MS), a user terminal (UT), a subscriber station (SS) It can be called a term.

The base station 20 generally refers to a point of communication with the terminal 10 and includes an evolved-NodeB (eNodeB), a base transceiver system (BTS), an access point, a femto-eNB, a pico-eNB, a home eNB, and a relay. The base station 20 may provide at least one cell to the terminal 10. [ The cell may mean a geographical area where the base station 20 provides communication services, or may refer to a specific frequency band. A cell may denote a downlink frequency resource and an uplink frequency resource. Or a cell may mean a combination of a downlink frequency resource and an optional uplink frequency resource. Also, in general, when one does not consider CA (Carrier Aggregation), uplink and downlink frequency resources always exist in one cell.

An interface for transmitting user traffic or control traffic may be used between the base stations 20. The base stations 20 may be interconnected via an X2 interface. The X2 interface is used for exchanging messages between the base stations 20. Meanwhile, the base station 20 is connected to an Evolved Packet System (EPS), more specifically a Mobility Management Entity (MME) / Serving Gateway (S-GW) 30 via an S1 interface. S1 interface supports many-to-many-relations between the base station 20 and the MME / S-GW 30. The PDN-GW is used to provide packet data service to the MME / S-GW 30. The PDN-GW depends on the purpose of the communication and the service, and the PDN-GW supporting the specific service can be found using APN (Access Point Name) information.

A new carrier type (NCT: New Carrier Type) may be applied to such a wireless communication system. In the NCT, for example, signals such as PBCH (Physical Broadcast Channel), PDCCH (Physical Downlink Control Channel), PHICH (Physical HARQ Indicator CHannel) and PCFICH (Physical Control Format Indicator CHannel) may not be transmitted. Transmission modes (TM) 1 to 8 may not be supported in the NCT. That is, TM 9 or TM 10 can be supported in the NCT. In the NCT, a PDSCH transmission method having a maximum of 8 layers can be supported, and a DCT (Downlink Control Information) format 1A / 2D (or 2C) can be used for PDSCH (Physical Downlink Shared CHannel) transmission on the NCT. The DCI formats 1A / 2D (or 2C) may be indicated via the EPDCCH on the NCT and may be indicated through cross-carrier scheduling from the LCT (Legacy Carrier Type). DCI format 0/4 can also be used for EPDCCH transmission on the NCT. Since the TM 9 or TM 10 can be supported by the NCT, a CSI-RS (CSI-RS) for supporting channel state information (CSI) feedback can be supported on the NCT.

Specifically, an NCT may include a non-standalone NCT and a standalone NCT and an NCT having a dormant mode.

First, a non-standalone NCT can not exist in a single cell form and can exist in the form of a secondary serving cell (SCell) when a primary serving cell (PCell) exists . For example, a non-standalone NCT can be aggregated with an existing carrier type (LCT: Legacy Carrier Type) set to PCell by setting SCell to a terminal configured with CA (Carrier Aggregation).

Non-standalone NCTs can be classified into synchronized carrier types and unsynchronized carrier types. Synchronous NCT refers to an NCT operating with reference to the synchronization of other carriers (e.g., legacy carriers). In other words, the synchronous NCT may be an NCT that is synchronized in time and frequency with other carriers and does not require a separate synchronization procedure at the terminal. In the synchronous NCT, a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Common Reference Signal (CRS) may not be transmitted. This allows overhead reduction of CRS, PSS and SSS. In the synchronous NCT, there may be advantages such as interference mitigation, energy saving, and improved spectral efficiency for adjacent cells due to the reduction of the overhead, The network provider can more freely utilize the frequency bandwidth.

An asynchronous NCT is an NCT that can operate independently by acquiring independent synchronization independent of other carriers (e.g., legacy carriers). For the asynchronous NCT, the PSS and the SSS transmit the same as the legacy carrier type, but the CRS transmission frequency and transmission bandwidth may be small. For example, in an asynchronous NCT, a CRS may be transmitted with a certain period, in which case the CRS may be referred to as reduced CRS (reduced CRS) or may be referred to as a TRS (Tracking RS) since it can only be used for synchronization purposes. Specifically, for example, the TRS can be transmitted based on the CRS antenna port 0 with a 5 ms period on the time axis. The TRS can also be transmitted over the entire system bandwidth on the frequency axis, or only on some system bandwidths.

Second, the standalone NCT is an NCT that can exist in a single cell form. For example, a standalone NCT can exist in the form of a main serving cell. Standalone NCTs Like the non-standalone NCTs, the CRS can be removed, but the TRS mentioned above can be transmitted. Accordingly, the existing PDCCH, PHICH, and PCFICH, which are CRS-based control channels, can be removed or replaced with other types of channels. The demodulation of EPDCCH and PDSCH in the standalone NCT can be performed based on a demodulation reference signal (DMRS).

Hereinafter, a control channel for carrying common DL control information such as system information, paging information, and transmission power control information in a Common Search Space (CSS) based on the DMRS is referred to as a common EPDCCH, A control channel for carrying downlink control information in USS (UE Specific Search Space) is referred to as a UE-specific EPDCCH. Simply, an EPDCCH may include both a common EPDCCH and a UE-specific EPDCCH.

2 is a diagram showing RRC parameters for setting the number of PRB pairs defined in each EPDCCH set. Hereinafter, an EPDCCH set for EPDCCH transmission will be described with reference to FIG.

One EPDCCH set p is defined as a group including N PRBs (Physical Resource Block) pairs, for example, K EPDCCH sets (e.g., 1? K? 2) . The EPDCCH set may also be referred to as the EPDCCH PRB set. Here, one PRB pair may be defined as a resource region corresponding to one RB (Resource Block) on the frequency axis and two slots on the time axis. Or one PRB pair may mean an area corresponding to twelve resource elements (REs) having 15KHz subcarrier spacing in a normal subframe, for example.

As shown in FIG. 2, the RRC (Radio Resource Control) setting for each EPDCCH set includes information on the transmission type (distributed transmission or local transmission) of the EPDCCH and the number N of PRB pairs used for the EPDCCH set And the like. The EPDCCH set may be composed of two, four or eight PRB pairs each, and each EPDCCH set need not have the same N value to each other. The PRB pairs may be overlapped, partially overlapped, or may not overlap at all between different EPDCCH sets. The PRB pair in each EPDCCH set may be indicated by resourceBlockAssignment-r11 and numberPRBPairs-r11 among the parameters shown in FIG.

,(1≤k_i≤N^DL _RB, k_i<k_{i +1})에 대응하고, 다음 수학식 1에 의하여 주어진다.Specifically, resourceBlockAssignment-r11 indicates the combinatorial index r. R is the PRB index

, (1? K _i? N ^DL _RB , k _i <k _{i +1} ), and is given by the following equation (1).

는 EPDCCH 셋 p를 구성(constituting)하는 PRB 들의 쌍들의 수이며, numberPRBPairs-r11에 의하여 지시된다. 그리고,

는 확장된(extended) 이항계수(binomial coefficient)이다. Where N ^DL _RB is the number of pairs of PRBs assocated with the downlink bandwidth,

Is the number of pairs of PRBs constituting the EPDCCH set p, indicated by numberPRBPairs-r11. And,

Is an extended binomial coefficient.

3A-3E illustrate examples of EREG (Enhanced Resource Element Group) mapping of PRB pairs according to an embodiment.

3A to 3E, 16 EREGs are included in one PRB pair. That is, all EREGs belonging to one PRB pair can be represented by indices 0 to 15.

In FIGS. 3A to 3E, 0, 1, 2,..., And 15 denoted in each resource element represent an index of an EREG to which each resource element belongs (or is mapped). Indexes 0, 1, 2, ..., 15 of the EREG for each resource element can be indexed in ascending order from the first subcarrier of the lowest frequency along the frequency axis on the first OFDM symbol in the time axis within one PRB pair. When EREG indexing is completed for the first OFDM symbol within a pair of PRBs, EREG indexing for each resource element can be performed sequentially from the first subcarrier along the frequency axis in the next time axis OFDM symbol. Meanwhile, the resource element indicated by R in Figs. 3A to 3E is a resource element used for transmission of the DMRS. Resource elements used for transmission of DMRS can be excluded from EREG indexing.

The arrangement and the number of DMRSs in the PRB pair may be different from each other in each of the embodiments as shown in FIG. 3A to FIG. 3E. For example, in FIG. 3A, since 24 resource elements are used for the DMRS, 16 EREGs are generated from 144 resource elements excluding 24 resource elements. In this case, one EREG may contain nine resource elements. However, an existing legacy control region, a CSI-RS, or a CRS may be arranged in addition to the DMRS in one PRB pair. In this case, since the number of available resource elements (available RE) in the PRB pair is reduced due to the existing control channel region, CSI-RS, or CRS, the number of resource elements included in the EREG can be reduced. In addition, since the number of resource elements available varies depending on the CP type, the number of resource elements included in the EREG can also be changed. Also, since the number of available resource elements varies depending on the type of the subframe, the number of resource elements included in the EREG can also be changed.

For example, FIG. 3A shows that sixteen EREGs are formed from the remaining 144 resource elements excluding the 24 DMRS resource elements out of 168 total resource elements in the PRB pair composed of the normal sub-frame and the normal CP.

In another example, FIG. 3B shows that sixteen EREGs are formed from the remaining 128 resource elements excluding the sixteen DMRS resource elements out of the total 144 resource elements in the PRB pair composed of the normal subframe and the extended CP. In this case, 0 EREG contains 8 resource elements.

In another example, FIG. 3C shows a PRB pair composed of special subframes 1 (9 OFDM symbols), 2 (10 OFDM symbols), 6 (9 OFDM symbols) In the configurations 1 and 6 (Embodiment A), 16 EREGs are formed from the remaining 84 resource elements excluding the 24 resource elements for the DM-RS among 108 resource elements available in the downlink, and special subframe configurations 2 and 7 (Embodiment B) shows that sixteen EREGs are formed from the remaining 96 resource elements excluding the 24 resource elements for the DM-RS among the 120 available resource elements in the downlink.

In another example, FIG. 3D shows a case where in a PRB pair composed of special subframe configurations 3 (11 OFDM symbols), 4 (12 OFDM symbols), 8 (11 OFDM symbols) In the configurations 3 and 8 (Embodiment A), 16 EREGs are formed from the remaining 108 resource elements excluding the 24 resource elements for the DM-RS among 132 resource elements available in the downlink, and a special subframe configuration 4 In the example B), 16 EREGs are formed from the remaining 120 resource elements excluding the 24 resource elements for the DM-RS among the 144 available resource elements in the downlink, and in the special subframe structure 9 (not shown) Indicates that 16 EREGs are formed from 60 resource elements except for 12 DM-RS resource elements out of 72 available resource elements.

As another example, FIG. 3E shows a configuration of a special subframe consisting of 8 OFDM symbols, 2 OFDM symbols, 3 OFDM symbols, 5 OFDM symbols, 6 OFDM symbols, In the PRB pair, sixteen EREGs are formed from the remaining 88 resource elements excluding the eight resource elements for the DM-RS among the 96 available resource elements in the downlink in the special subframe configurations 1 and 5 (Embodiment A) And 16 EREGs are formed from the remaining 100 resource elements excluding the 8 resource elements for the DM-RS among the 108 resource elements available in the downlink in the special subframe configurations 2 and 6 (Embodiment B) And in the special subframe structure 3 (not shown), 16 EREGs are formed from the remaining 112 resource elements excluding the DM-RS resource elements out of 120 available resource elements in the downlink.

As described above, the number of resource elements included in the EREG may depend on the area size of the existing control channel, the type of the reference signal, the CP type, and the subframe type. However, 16, the number of EREGs included in one PRB pair, .

In the special subframe configuration of FIGS. 3C to 3E, the resource elements indicated by a lattice on the right side of the slot 1 correspond to a Guard Period (GP) and an Uplink Pilot Time Slot (UpPTS). The number of Orthogonal Frequency Division Multiplexing (OFDM) symbols for the Downlink Pilot Time Slot (DwPTS) varies depending on the particular subframe configuration and the associated CP type.

The EPDCCH is transmitted based on one or more Enhanced Control Channel Elements (ECCE). An ECCE is a basic unit through which EPDCCH is transmitted. For example, one EPDCCH can be mapped to one ECCE, two ECCEs, four ECCEs, eight ECCEs, 16 ECCs, or 32 ECCCEs. Therefore, the EPDCCH for transmitting downlink control information (DCI) is transmitted in a manner of aggregating one ECCE or a plurality of ECCEs.

An ECCE may include a plurality of EREGs. For example, an ECCE may include four EREGs or eight EREGs. Here, one EREG is a group composed of at least one resource element.

How many EREGs are included in the ECCE may depend on the type of subframe (e.g., normal subframe or special subframe), and CP type. For example, an ECCE may include four EREGs in a normal CP (cyclic prefix) and a normal or special subframe configuration 3, 4, 8, an extended CP, a normal CP, and a special And 8 EREGs in subframe configurations 1, 2, 6, 7, and 9. That is, one ECCE may include one or more EREGs. For example, the number of EREGs included in each ECCE can be defined as shown in Table 1 below.

Normal CP Expanded CP The normal subframe Special subframe configurations 3,4,8 Special subframe configuration 1,2,6,7,9 The normal subframe Special subframe structure 1,2,3,5,6 4 8

Referring to Table 1, N ^ECCE _{EREG, which} is the number of EREGs constituting one ECCE, is defined according to the type and CP type of each subframe. For example, in a PRB pair consisting of a normal CP and a normal subframe or a normal CP and a special subframe configuration 3, 4, and 8, N ^ECCE _EREG is 4, and an extended CP and a normal subframe or a normal CP and a special subframe configuration 1 , 2, 6, 7, 9, or 8, where N ^ECCE _EREG is 8 in the PRB pair consisting of extended CPs and special subframe configurations 1, On the other hand, the number of _ECCEs N ^RB _ECCE per PRB pair can be determined through N ^ECCE _EREG . Where N ^RB _ECCE = 16 / N ^ECCE _EREG . N ^{ECCE When} _EREG = 4, the number of _ECCEs included in one PRB pair is N ^RB _ECCE = _16/4 = 4. When N ^ECCE _EREG = 8, the number of _ECCEs included in one PRB pair is N ^RB _ECCE = _16/8 = 2. On the other hand, the number of ECCEs constituting one EPDCCH N ^EPDCCH _ECCE can be defined as shown in Table 2 according to the format of EPDCCH as an example.

EPDCCH format Number of ECCEs constituting one EPDCCH N ^EPDCCH _ECCE Casea Case B Local transmission Distributed transmission Local transmission Distributed transmission 0 2 2 One One One 4 4 2 2 2 8 8 4 4 3 16 16 8 8 4 - 32 - 16

The index (i.e., position) of the EREGs belonging to the ECCE can be defined by a certain rule, which can be referred to as an ECCE-to-EREG mapping. There are two types of ECCE-to-EREG mapping: localized transmission and distributed transmission. 4A is an exemplary diagram illustrating local transmission of an EPDCCH, and FIG. 4B is an exemplary diagram illustrating distributed transmission of an EPDCCH. An EREG group constituting one ECCE in the local transmission is selected in the EREG in one PRB pair.

For example, suppose that one ECCE includes four EREGs, and one EPDCCH set is configured to include four PRB pairs.

EREG 1, EREG 5, EREG 9, and EREG 13 in the PRB pair # 0, as shown in FIG. 4A. , ECCE # 2 = {EREG 2, EREG 6, EREG 10, EREG 14}, ECCE # 3 = {EREG 3, EREG 7, EREG 11, EREG 15}. This also applies to PRB pairs # 1, # 2 and # 3. Or one ECCE is configured to include eight EREGs, ECCE # 0 = {EREG 0, EREG 2, EREG 4, EREG 6, EREG 8, EREG 10, EREG 12, EREG 14} EREG 1, EREG 3, EREG 5, EREG 7, EREG 9, EREG 11, EREG 13, EREG 15}.

On the other hand, according to the distributed transmission, as shown in FIG. 4B, an EREG group constituting one ECCE is selected from EREGs of different PRB pairs. For example, ECCE # 0 = EREG 0 of {PRB pair # 0, EREG 4 of PRB pair # 1, EREG 8 of PRB pair # 2, EREG 12 of PRB pair # 3). This applies equally to other ECCEs.

EPDCCH based on local transmission may be referred to as local EPDCCH, and EPDCCH based on distributed transmission may be referred to as distributed EPDCCH. The distributed EPDCCH can obtain a diversity gain, and the local EPDCCH can be used for control information transmission through preferred precoding for a specific terminal with frequency selective characteristics.

Meanwhile, the BS can transmit a plurality of EPDCCHs in one subframe, and the UE can monitor at least one UE-specific EPDCCH in a UE-specific search space (USS) every subframe. Here, monitoring means that the UE attempts to decode the EPDCCH according to the EPDCCH format. Monitoring may also be referred to as blind decoding.

The blind decoding demasking a cyclic redundancy check (CRC) of the received EPDCCH (referred to as an EPDCCH candidate) by an identifier related to the common control information, checks the CRC error, Is a control channel. The reason for performing the blind decoding is that the UE does not know in advance where the EPDCCH is transmitted in the UE-specific search space and in which aggregation unit or DCI format.

A search space (SS) can be used. The search space is a monitoring set of the ECCE for EPDCCH. The search space is divided into a common search space and a terminal-specific search space. The terminal monitors the EPDCCH within the search space. The UE-specific search space is a space for searching an EPDCCH having dedicated downlink control information for each UE.

The starting point of the UE-specific search space may vary from subframe to subframe depending on the terminal identifier (e.g., Cell-Radio Network Temporary Identifier (C-RNTI)), aggregation unit and /

In order for the UE to monitor the EPDCCH in the UE-specific search space, the amount of the ECCE constituting the UE-specific search space, the aggregation level of the ECCE, and the number of the EPDCCH candidates according to the aggregation unit number) or a combination of these should be defined according to certain rules. The definition of these rules is called an EPDCCH assignment rule (EPDCCH assignment rule). The EPDCCH allocation rule is a communication protocol in which the BS and the MS promise to each other. That is, a procedure for the base station to transmit the EPDCCH to the UE, the number of monitoring times of the UE, and the like are determined according to the EPDCCH allocation rule.

The EPDCCH allocation rule can be classified into, for example, Case 1 to Case 3. This is because the number of resource elements constituting one ECCE existing in one PRB pair may vary depending on various settings (for example, RS overhead, legacy control region, etc.) Therefore, from the viewpoint of link adaptation, the link performance experienced by one EPDCCH needs to be uniform regardless of other settings.

이거나, 또는 ii) 노멀 CP 및 특별 서브프레임 설정 3,4,8 이고 DCI 2/2A/2B/2C/2D가 모니터링되며 모니터링되는 셀의 하향링크 전체 PRB 쌍의 수가

이거나, 또는 iii) 노멀 CP 및 노멀 서브프레임이고 DCI 1A/1B/1D/1/2/2A/2B/2C/2D/0/4 모니터링되며 n_EPDCCH<104인 경우, 또는 iv) 노멀 CP 및 특별 서브프레임 설정 3,4,8이고 DCI 1A/1B/1D/1/2/2A/2B/2C/2D/0/4가 모니터링되며 n_EPDCCH<104인 경우를 포함한다. 이 경우 하나의 PRB 쌍 내에서 4개의 ECCE가 구성될 수 있다.Case 1 includes i) a normal CP and a normal subframe, where DCI 2 / 2A / 2B / 2C / 2D is monitored and the number of downlink total PRB pairs

Or ii) DCI 2 / 2A / 2B / 2C / 2D is monitored with the normal CP and special subframe settings 3, 4, 8 and the number of downlink total PRB pairs of the monitored cells

Or iii) is a normal CP and a normal subframe and monitored by DCI 1A / 1B / 1D / 1/2 / 2A / 2B / 2C / 2D / _0/4 and n _EPDCCH <104; or iv) Subframe settings 3, 4, 8 and DCI 1A / 1B / 1D / 1/2 / 2A / 2B / 2C / 2D / _0/4 are monitored and n _EPDCCH <104. In this case, four ECCEs can be constructed within one PRB pair.

In Case 2, i) extended CP and normal subframe and DCI 1A / 1B / 1D / 1/2 / 2B / 2C / 2D / 0/4 are monitored, or ii) 2, 6, 7, 9 and DCI 1A / 1B / 1D / 1/2 / 2B / 2C / 2D / 0/4 are monitored, or iii) , 6, and DCI 1A / 1B / 1D / 1/2 / 2B / 2C / 2D / 0/4 are monitored. Case 3 can be applied to cases other than Case 1 and Case 2.

5 is a diagram showing an FDD frame structure.

Referring to FIG. 5, the PBCH is transmitted on the first four OFDM symbols in the second slot of the FDD subframe # 0. In the FDD, PSS and SSS are transmitted on the last two OFDM symbols in the first slot in subframe # 0 and subframe # 5. On the other hand, in the TDD, the SSS is transmitted on the last OFDM symbol of the subframes # 0 and # 5, and the PSS is transmitted on the third OFDM symbol of the subframes # 1 and # 6. That is, the positions of the PBCH and the synchronization signal in the center 6 PRB pair can be arranged as shown in the following table.

FDD TDD SF # 0 SF # 5 SF # 0 SF # 1 SF # 5 SF # 6 PBCH &
PSS / SSS PSS / SSS PBCH & SSS PSS FAQ PSS

Referring to Table 3, SF #x represents a subframe index.

In FIG. 5, the CRS indicates that the CRS is transmitted on the entire band, and actually does not indicate that all subcarriers in one OFDM symbol are used as a CRS.

According to the prior art, the terminal-specific EPDCCH was not transmitted in the central 6 PRB pair where the PBCH and the PSS / SSS are transmitted. Since NCT does not support CRS-based decoding, the existing PDCCH is not supported. Therefore, the use of the UE-specific EPDCCH transmitted in the UE-specific search space is required. Or if EPDCCH transmission in the common search space is later supported, EPDCCH can also be supported in the common search space. In particular, if the system bandwidth (BW) is 1.5 MHz with 6 PRB (Physical Resource Block) pairs, a synchronous HARQ operation on the PUSCH on the NCT is performed without performance degradation An UL grant must be transmitted and the EPDCCH must be able to be transmitted on the central 6 PRB pair. In addition, even when the system bandwidth is 3, 5, 10, 15, or 20 MHz, the setting of the EPDCCH transmission PRB pair and the subframe on the central 6 PRB pair must be supported by the upper signaling.

On the other hand, when one PRB set for the EPDCCH is set to at least one of the middle 6 PRB pairs and one EPDCCH candidate is scheduled for the corresponding PRB pair, available) REs (n _EPDCCH ).

Also, EPDCCH and PRS (Positioning Reference Signal) may be transmitted on the same PRB pair. That is, the PRB to which the PRS is transmitted and the PRB to which the EPDCCH can be transmitted may overlap. In this case, the UE can operate differently according to the CP lengths of the PRS and the EPDCCH. For example, if the PRS and the EPDCCH have different CP lengths, the UE may not monitor the EPDCCH in the subframe in which the PRS is configured. In another example, if PRS and EPDCCH have the same CP length, the UE may monitor the EPDCCH regardless of whether the PRB pair overlaps with the PRS. When the PRB pair to which the EPDCCH is transmitted overlaps with the PRB pair to which the PRS is transmitted, the EPDCCH PRB pairs may have different n _EPDCCH values.

Figures 6 and 7 illustrate the case where the available REs of two different EPDCCH PRB pairs are unbalanced.

Referring to FIG. 6, it can be seen that the number of available REs of the PRB pair configured for EPDCCH is 144 and 84, respectively. Also, referring to FIG. 7, it can be seen that the number of available REs of the PRB pair configured for the EPDCCH is 144 and 128, respectively.

In the prior art and standard, the n _EPDCCH value is defined as the number of REs satisfying a specific condition in one PRB pair among PRB pairs set in one EPDCCH set. Therefore, in the case where the available REs of the PRB pair configured for the EPDCCH are non-uniform, a measure is required for the terminal to perform blind decoding for the EPDCCH based on an n _EPDCCH value.

In order to solve the above problems, the definition and determination method of the n _EPDCCH proposed in the present invention is as follows.

n _EPDCCH is defined as the number of downlink resource elements (k, l) in a PRB pair configured for possible EPDCCH transmission of EPDCCH set S ₀ , and the downlink resource elements satisfy the following criteria.

8 is a diagram showing criteria that the downlink resource elements for n _EPDCCH satisfy.

Referring to FIG. 8, it is assumed that the DL resource elements are not used for a cell-specific RS (or a TRS in the NCT).

Also, the DL resource elements are assumed by the UE to not be used for PBCH or synchronization signals (PSS / SSS).

It is also assumed that the downlink resource elements are not used for PRS.

In accordance with the above criteria and definition, the value of n _EPDCCH may be different between PRB pairs set in one EPDCCH set. Also, the value of n _EPDCCH may differ depending on the presence of PRS, synchronization signals and / or PBCH set in one EPDCCH set.

9 is a diagram showing examples of PRB pairs having different n _EPDCCH values.

Referring to FIG. 9, case 1 is a case where EPDCCH PRB pairs include synchronization signals and a PBCH. In case 2, one EPDCCH PRB pair includes synchronization signals and a PBCH, and the other EPDCCH PRB pair includes PRS. In case 3, one EPDCCH PRB pair includes the PRS and the other EPDCCH PRB pair follows the overhead assumption in the current standard.

In this case, the nEPDCCH value may be different between the PRB phases set in one EPDCCH set. Therefore, when assigning the EPDCCH candidate (by eNB) or monitoring the EPDCCH candidate (by UE) Should be applied.

In this case, the determination of the n _EPDCCH value _serving as a reference for the PRB pairs set in one EPDCCH set can be performed as follows.

1st Example

As a first embodiment, when the PRB pairs set in one EPDCCH set have different n _EPDCCH values, the lowest value n _EPDCCH value can be used as a reference. In other words, the lowest available RE can be used as a standard. This can be expressed by the following equation (2).

는 PRB 인덱스 k_i의 n_EPDCCH 값을 나타내고, i 값의 범위는

이고,

는 EPDCCH 셋 p 내에 설정된 PRB 쌍의 개수이다.here,

_Represents the n _EPDCCH value of the PRB index k _i , and the range of the i value is

ego,

Is the number of PRB pairs set in the EPDCCH set p.

Second Example

As a second embodiment, when PRB pairs set in one EPDCCH set have different n _EPDCCH values, the highest value n _EPDCCH value can be used as a reference. That is, it can be standard that the available RE is the largest. This can be expressed by the following equation (3).

는 PRB 인덱스 k_i의 n_EPDCCH 값을 나타내고, i 값의 범위는

이고,

는 EPDCCH 셋 p 내에 설정된 PRB 쌍의 개수이다.here,

_Represents the n _EPDCCH value of the PRB index k _i , and the range of the i value is

ego,

Is the number of PRB pairs set in the EPDCCH set p.

Third Example

As a third embodiment, a PRB pair is set within a EPDCCH set may determine the different n _EPDCCH n _EPDCCH value serving as a reference according to the percentage of the PRB pair having a value when n _EPDCCH have different values. For example, if the ratio of the PRB pair having the largest n _EPDCCH value is more than half (or more), the largest n _EPDCCH value is used as a reference value, otherwise, the lowest n _EPDCCH value is used as a reference Value. This can be expressed as shown in Table 4 below.

와 동일한 값을 가지는PRB 쌍의 수가

보다 많은(또는 많거나 같은) 경우,

otherwise,

if

The number of PRB pairs having the same value as

If more (or more or equal)

otherwise,

는 PRB 인덱스 k_i의 n_EPDCCH 값을 나타내고, i 값의 범위는

이고,

는 EPDCCH 셋 p 내에 설정된 PRB 쌍의 개수이다.here,

_Represents the n _EPDCCH value of the PRB index k _i , and the range of the i value is

ego,

Is the number of PRB pairs set in the EPDCCH set p.

Fourth Example

As a fourth embodiment, when PRB pairs set in one EPDCCH set have different n _EPDCCH values, it is possible to determine a reference n _EPDCCH value according to the transmission BW. For example, if N ^DL _RB is less than 14 (or BW is less than _{1.5 MHz} ), the largest n _EPDCCH value should be the reference value, otherwise the lowest n _EPDCCH value may be the reference value. have. This can be expressed as shown in Table 5 below.

otherwise,

if N ^DL _RB < 14 (or BW &lt; 1.5 MHz)

otherwise,

는 PRB 인덱스 k_i의 n_EPDCCH 값을 나타내고, i 값의 범위는

이고,

는 EPDCCH 셋 p 내에 설정된 PRB 쌍의 개수이다.here,

_Represents the n _EPDCCH value of the PRB index k _i , and the range of the i value is

ego,

Is the number of PRB pairs set in the EPDCCH set p.

For example:

10 shows an example in which four PRB pairs are set in one EPDCCH set.

Referring to FIG. 10, case 1 uses 1.5 MHz for BW, case 2 uses 3 MHz for BW, and case 3 uses 5 MHz for BW. As shown in case 1, if the BW is _{1.5 MHz} , the largest n _EPDCCH value among the n _EPDCCH values of the four PRB pairs can be set as a reference value. Alternatively, as in cases 2 and 3, if the BW is 3 MHz and 5 MHz, the smallest n _EPDCCH value among the n _EPDCCH values of the four PRB pairs can be set as a reference value.

Fifth Example

As a fifth embodiment, when the PRB pairs set in one EPDCCH set have different n _EPDCCH values, a reference n (n ^DL _RB ) and a PRB pair having different n _EPDCCH values _{The EPDCCH} value can be determined. This can be expressed as shown in Table 6 below.

else if, N^DL _{RB ≥}14이고,

와 동일한 값을 가지는PRB 쌍의 수가

보다 많은(또는 많거나 같은) 경우,

otherwise,

if N ^DL _RB < 14,

else if, N ^DL _{RB ≥} 14,

The number of PRB pairs having the same value as

If more (or more or equal)

otherwise,

는 PRB 인덱스 k_i의 n_EPDCCH 값을 나타내고, i 값의 범위는

이고,

는 EPDCCH 셋 p 내에 설정된 PRB 쌍의 개수이다.here,

_Represents the n _EPDCCH value of the PRB index k _i , and the range of the i value is

ego,

Is the number of PRB pairs set in the EPDCCH set p.

For example:

11 shows another example in which four pairs of PRBs are set in one EPDCCH set.

와 동일한 값을 가지는 PRB 쌍들의 수가

보다 적다면, 4개의 PRB 쌍들의 n_EPDCCH 값들 중 가장 작은 n_EPDCCH 값을 기준이 되는 값으로 할 수 있다. 또한 case3과 같이 BW가 5MHz인 경우, N^DL _RB가14보다 크고,

와 동일한 값을 가지는 PRB 쌍들의 수가

보다 많으므로, 4개의 PRB 쌍들의 n_EPDCCH 값들 중 가장 큰 n_EPDCCH 값을 기준이 되는 값으로 할 수 있다.Referring to FIG. 11, case 1 uses 1.5 MHz for BW, case 2 uses 3 MHz for BW, and case 3 uses 5 MHz for BW. As shown in case 1, if the BW is _{1.5 MHz} , the largest n _EPDCCH value among the n _EPDCCH values of the four PRB pairs can be set as a reference value. Also, as shown in case 2, when BW is 3 MHz, N ^DL _RB is larger than 14,

Lt; RTI ID = 0.0 &gt; PRB &lt; / RTI &

The smaller n _EPDCCH value among the n _EPDCCH values of the four PRB pairs can be set as a reference value. Also, as in case 3, when BW is 5 MHz, N ^DL _RB is greater than 14,

Lt; RTI ID = 0.0 &gt; PRB &lt; / RTI &

, The largest n _EPDCCH among the n _EPDCCH values of the four PRB pairs The value can be a reference value.

6th Example

As a sixth embodiment, when PRB pairs set in one EPDCCH set have different n _EPDCCH values, the average value of n _EPDCCH values of the PRB pairs can be determined as a reference n _EPDCCH value. This can be expressed by the following equation (4) or (5).

는 PRB 인덱스 k_i의 n_EPDCCH 값을 나타내고, i 값의 범위는

이고,

는 EPDCCH 셋 p 내에 설정된 PRB 쌍의 개수이다.here,

_Represents the n _EPDCCH value of the PRB index k _i , and the range of the i value is

ego,

Is the number of PRB pairs set in the EPDCCH set p.

Through the above-described method, effective EPDCCH transmission can be performed on the NCT without major changes to the existing EPDCCH design (for example, a hashing function and a blind decoding table).

12 is a flowchart illustrating an EPDCCH transmission / reception process between a UE and a BS according to an exemplary embodiment of the present invention.

12, the base station determines the n _EPDCCH value serving as a reference based on the value of n _EPDCCH PRB pair is set within a EPDCCH set (or configured) to (S1200). When the PRB pairs set in one EPDCCH set have different n _EPDCCH values, for example, the base station can determine the lowest n _EPDCCH value as the reference n _EPDCCH value. As another example, the base station can be determined by n _EPDCCH value serving as a reference to the most large value n _EPDCCH value. In another example, the base station may determine a reference n _EPDCCH value according to the ratio of PRB pairs having different n _EPDCCH values. As another example, the base station may determine a reference n _EPDCCH value according to the transmission BW (or N ^DL _RB ). As another example, the base station may determine a reference n _EPDCCH value according to the ratio of the transmission BW (or N ^DL _RB ) and the PRB pair having different n _EPDCCH values. As another example, the base station may determine the average value of the n _EPDCCH values of the PRB pairs as the reference n _EPDCCH value.

The base station performs RRC signaling with the terminal (S1210). The RRC signaling may include the RRC parameters of FIG. 2 described above.

The UE can recognize a resource element in the physical layer for the EPDCCH based on the RRC message received from the base station (S1220). In this case, the UE can directly or indirectly obtain the reference n _EPDCCH value. For example, the reference n _EPDCCH value may be directly included in the RRC signaling. As another example, the RRC signaling may include the RRC parameters of FIG. 2 described above. The UE acquires indirectly (or implicitly) a reference n _EPDCCH value through a predefined protocol between the UE and the base station .

For example, the UE can _{recognize the} n _EPDCCH value having the _smallest value as the reference n _EPDCCH value. As another example, the UE can _{recognize the} n _EPDCCH value having the largest value as the reference n _EPDCCH value. As another example, the UE can recognize a reference n _EPDCCH value according to the ratio of PRB pairs having different n _EPDCCH values. As another example, the UE can recognize a reference n _EPDCCH value according to the transmission BW (or N ^DL _RB ). As another example, the UE can recognize a reference n _EPDCCH value according to a ratio of a transmission BW (or N ^DL _RB ) and a PRB pair having different n _EPDCCH values. As another example, the UE can _recognize the average value of the n _EPDCCH values of the PRB pairs as the reference n _EPDCCH value.

The UE can recognize the resource element for the EPDCCH based on the n _EPDCCH value _{serving as} the reference and the RRC parameters.

If the base station transmits the EPDCCH to the UE based on the n _EPDCCH value as the reference (S1230), the UE can receive the EPDCCH based on the resource element for the recognized EPDCCH (S1240). Thus, the base station and the terminal can smoothly transmit and receive EPDCCH through the NCT cell.

13 is a block diagram illustrating a base station and a terminal according to an exemplary embodiment of the present invention.

13, the base station 1300 includes a base station processor 1310, a transmitting unit 1320, and a receiving unit 1330. The base station processor 1310 may include an RRC processor 1311 and a PHY processor 1312.

The RRC processor 1311 generates an RRC message regarding the EPDCCH. The RRC processor 1311 may generate an RRC message including the RRC parameters described above with reference to FIG. 3, for example.

The RRC processor 1311 determines (or configures) an n _EPDCCH value _{serving as} a reference of PRB pairs set in one EPDCCH set. In this case, the RRC processor 1311 sets the n _EPDCCHs of the PRB pairs set in one EPDCCH set (Or configure) the n _EPDCCH value as a reference based on the values. The RRC processor 1311 may determine (or configure) a reference n _EPDCCH value based on at least one of the above-described Equations (2) through (5) and Table 4 through Table 5, for example.

When the PRB pairs set in one EPDCCH set have different n _EPDCCH values, for example, the RRC processor 1311 can determine the n _EPDCCH value with the _lowest value as the reference n _EPDCCH value. As another example, the RRC processor 1311 may determine the n _EPDCCH value having the largest value as the reference n _EPDCCH value. As another example, the RRC processor 1311 may determine a reference n _EPDCCH value according to the ratio of PRB pairs having different n _EPDCCH values. As another example, the RRC processor 1311 may determine a reference n _EPDCCH value according to the transmission BW (or N ^DL _RB ). As another example, the RRC processor 1311 can determine a reference n _EPDCCH value according to a ratio of a transmission BW (or N ^DL _RB ) and a PRB pair having different n _EPDCCH values. As another example, the RRC processor 1311 may determine the average value of the n _EPDCCH values of the PRB pairs as the reference n _EPDCCH value.

The PHY processing unit 1312 can generate the DCI of the physical layer and add the CRC for error detection to the DCI. The PHY processor 1312 can generate the control information EPDCCH based on the n _EPDCCH value serving as a reference. The PHY processing unit 1312 can generate the encoded data by performing channel coding on the control information to which the CRC is added.

The transmitting unit 1320 transmits the generated RRC message to the terminal 1350. The transmission unit 1320 transmits the generated EPDCCH to the terminal 1350.

The receiving unit 1330 can receive the uplink data transmitted from the terminal 1350.

The terminal 1350 includes a terminal processor 1360, a receiving unit 1370, and a transmitting unit 1380. The terminal processor 1360 includes an RRC processor 1361 and a PHY processor 1362.

Receiver 1370 receives the RRC message from base station 1300 and receives the EPDCCH.

The RRC processor 1361 can analyze and analyze the received RRC message. The RRC processor 1361 can acquire information on a reference n _EPDCCH value based on the received RRC message. The RRC processor 1361 processes the n _EPDCCHs of the PRB pairs set in one EPDCCH set Even if the values are different, the reference n _EPDCCH value can be recognized.

The PHY processing unit 1362 can recognize the resource element in the physical layer for the EPDCCH and can receive the EPDCCH transmitted from the base station via the receiving unit 1370. [ The PHY processing unit 1362 can also generate uplink data.

The transmitting unit 1380 transmits the generated uplink data to the base station 1300.

All of the functions described above may be performed by a processor such as a microprocessor, a controller, a microcontroller, an application specific integrated circuit (ASIC), etc. according to software or program code or the like coded to perform the function. The design, development and implementation of the above code will be apparent to those skilled in the art based on the description of the present invention.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention. You will understand. Therefore, it is intended that the present invention covers all embodiments falling within the scope of the following claims, rather than being limited to the above-described embodiments.

Claims (18)

A method for transmitting a control channel by a base station in an NCT (New Carrier Type) based wireless communication system,
Based on n _EPDCCH values of a plurality of pairs of PRBs set in one EPDCCH set, a reference n _EPDCCH Determining a value;
The reference n _EPDCCH Generating an Enhanced Physical Downlink Control Channel (EPDCCH) based on the value; And
And transmitting the generated EPDCCH to a mobile station. The method according to claim 1,
N _EPDCCH value to which the standard is a control channel transmission method characterized in that n is determined by the values _EPDCCH the least value of n _EPDCCH value of the plurality of PRB pairs. The method according to claim 1,
N _EPDCCH value to which the standard is a control channel transmission method characterized in that n is determined by the values _EPDCCH the value of n larger _EPDCCH value of the plurality of PRB pairs. The method according to claim 1,
N _EPDCCH value to which the standard is a control channel transmission method characterized by a ratio determined in accordance with the value of n _EPDCCH of the plurality of PRB pairs. 5. The method of claim 4,
N _EPDCCH value to which the standard, control channel transmission, characterized by determined to not less than the ratio is large, or half than half the PRB pair having the largest n _EPDCCH values of pairs of said plurality of PRB to the largest n _EPDCCH value Way. The method according to claim 1,
The n _EPDCCH value _{serving as} the criterion may be a size of a transmission bandwidth (BW: Bandwidth) or a value of N ^DL _RB Value of the control channel. The method according to claim 1,
_Wherein the reference n _EPDCCH value is determined according to a size of a transmission bandwidth and a ratio of n _EPDCCH values of the plurality of PRB pairs. The method according to claim 1,
N _EPDCCH value to which the standard is a control channel transmission method characterized by the average value of n is determined by _EPDCCH value of the plurality of PRB pairs. A method for receiving a control channel by a terminal in an NCT-based wireless communication system,
Receiving an RRC (Radio Resource Control) message;
The n _{EPDCCHs serving as} a reference of PRB pairs set in one EPDCCH set based on the received RRC message Recognizing a value;
The reference n _EPDCCH Recognizing a resource element for the EPDCCH based on the value; And
And receiving the EPDCCH on a resource element for the perceived EPDCCH. 10. The method of claim 9,
N _EPDCCH value at which the criterion, the control channel reception method characterized in that if the value of n _EPDCCH values of the plurality of PRB pairs least n _EPDCCH value. 11. The method of claim 10,
_Wherein the reference n _EPDCCH value is recognized as an n _EPDCCH value having a largest value among n _EPDCCH values of the plurality of PRB pairs. 10. The method of claim 9,
N _EPDCCH value to which the standard method, the control channel reception, characterized in that, depending on whether the ratio of n _EPDCCH value of the plurality of PRB pairs. 13. The method of claim 12,
N _EPDCCH value to which the standard is received, a control channel, characterized in that if on or more the ratio is large, or half than half the PRB pair having the largest n _EPDCCH values of pairs of said plurality of PRB to the largest n _EPDCCH value Way. 10. The method of claim 9,
The n _EPDCCH value _{serving as} the reference is the size of the transmission bandwidth or the N ^DL _RB Value of the control channel. 10. The method of claim 9,
_Wherein the reference n _EPDCCH value is _recognized according to a size of a transmission bandwidth and a ratio of n _EPDCCH values of the plurality of PRB pairs. 10. The method of claim 9,
N _EPDCCH value at which the criterion, the control channel reception method characterized in that if the average value of n _EPDCCH value of the plurality of PRB pairs. A base station for transmitting a control channel in an NCT-based wireless communication system,
Based on n _EPDCCH values of a plurality of pairs of PRBs set in one EPDCCH set, a reference n _EPDCCH An RRC processing unit for determining a value;
The reference n _EPDCCH A PHY processing unit for generating an Enhanced Physical Downlink Control Channel (EPDCCH) based on the value; And
And a transmitter for transmitting the generated EPDCCH to a mobile station. A terminal for receiving a control channel in an NCT-based wireless communication system,
A receiver for receiving an RRC (Radio Resource Control) message;
The n _{EPDCCHs serving as} a reference of PRB pairs set in one EPDCCH set based on the received RRC message An RRC processing unit recognizing a value; And
The reference n _EPDCCH And a PHY processing unit for recognizing a resource element for the PDCCH based on the value of the resource element,
Wherein the receiver receives the EPDCCH on a resource element for the perceived EPDCCH.

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