KR20140120173A - Apparatus and method for acquiring configuration information of control channel in wireless communication system based on nct - Google Patents

Abstract

The present invention relates to an apparatus and method for acquiring configuration information of a control channel in an NCT-based wireless communication system. The present invention relates to a method and apparatus for receiving a PBCH including a CRC from a base station, demasking the CRC as a predetermined arbitrary bit string, determining, based on the demasking, a PRB And identifying and monitoring an E-PDCCH set based on the number of PRB pairs and the index of the PRB pair.
The E-PDCCH can be efficiently configured on the NCT, and no signaling is required, so that the overhead can be reduced.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and a method for acquiring configuration information of a control channel in a wireless communication system based on an NCT,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to wireless communication, and more particularly, to an apparatus and method for acquiring configuration information of a control channel in a NCT-based wireless communication system.

Component carriers (CC) used in a conventional multiple component carrier system emphasize the versatility of the physical layer, and control area redundancy and common signal overhead still exist. Therefore, it is emphasized that there is an unnecessary loss in terms of spectral efficiency because resources for data signals are reduced. Accordingly, in order to efficiently operate the multi-carrier system, it is required to introduce a new carrier type (NCT: New Carrier Type) constituting a multi-carrier system. In the NCT, a reference signal (RS) for downlink control channel or channel estimation is generated within a range where there is no degradation or minimization of performance as compared with a legacy carrier type (LCT) ) May 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 an 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 a single cell form. For example, a standalone NCT can exist in the form of a main serving cell. In a standalone NCT and a non-standalone NCT, a cell-specific RS (CRS) may not be transmitted. Accordingly, a control channel based on CRS, which is a conventional physical downlink control channel (PDCCH), a physical HARQ indicator channel (PHICH), a physical control format indicator channel : PCFICH) may be removed or replaced with another type of channel.

In the stand-alone NCT, an extended physical downlink control channel (E-PDCCH) may be used for the purpose of expanding the capacity of the existing PDCCH. The E-PDCCH may also be referred to as an enhanced physical downlink control channel, which until now can only be transmitted in a UE specific search space (USS). On the other hand, the PDCCH transmits common downlink control information (DCI) such as system information, paging information, and transmission power control information as well as the UE specific search space as the above E-PDCCH to a common search space, CSS). However, the PDCCH is coherently detected in the CRS, and the E-PDCCH is coherently detected in the demodulation reference signal (DMRS). In this case, the demodulation of the E-PDCCH and the PDSCH in the standalone NCT can be performed based on the DMRS.

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. On the other hand, in the NCT, a common search space for the E-PDCCH can be defined to supplement the E-PDCCH, so that the E-PDCCH can be used for transmission of the system information. In order to demodulate the E-PDCCH before the UE acquires the SIB information, the number of physical resource blocks (PRB) pairs to which the E-PDCCH is mapped and the number of E- PDCCH configuration information in advance.

The E-PDCCH configuration information is a message transmitted from an upper layer such as a radio resource control (RRC) layer, and an E-PDCCH is also used for transmission of an RRC message. However, it is contradictory to use the E-PDCCH to receive the E-PDCCH configuration information while the UE does not know the E-PDCCH configuration information. In this situation, since the UE can not detect the E-PDCCH, the UE fails to receive the system information and may eventually become unable to communicate.

Therefore, it is necessary to define a method of informing the UE of the E-PDCCH configuration information in the NCT-based wireless communication system, a base station performing the E-PDCCH configuration information, a method of securing the E-PDCCH configuration information, and a terminal performing the E-PDCCH configuration information.

An object of the present invention is to provide an apparatus and method for acquiring control channel configuration information in a wireless communication system based on NCT.

It is another object of the present invention to provide a terminal and a method for detecting a resource block mapped with an extended control channel in a NCT-based wireless communication system.

According to another aspect of the present invention, there is provided a base station for determining a resource block to which an extended control channel is mapped in a wireless communication system based on NCT, and a method thereof.

According to an aspect of the present invention, there is provided a method for a terminal to receive configuration information of a control channel in a wireless communication system based on a new carrier type (NCT). The method includes receiving a physical broadcast control channel (PBCH) including a cyclic redundancy check (CRC) from a base station, demasking the CRC as a predetermined bit stream, Recognizing a number of physical resource block pairs (PRB pairs) constituting an enhanced physical downlink control channel (E-PDCCH) set for the UE based on the demasking, And identifying and monitoring an E-PDCCH set based on the number of PRB pairs and the index of the PRB pair.

The index of the PRB pair may be randomly selected in the basic combination pool including the combination of all PRB pairs. Or the index of the PRB pair may be randomly selected in the basic combination pool based on the ID of the cell to which the terminal belongs and the subframe index. Alternatively, the index of the PRB pair may be randomly selected in a limited combination pool that is a subset of the base combination pool including all combinations of PRB pairs.

According to another aspect of the present invention, there is provided a terminal for receiving configuration information of a control channel in a wireless communication system based on a new carrier type (NCT). The UE receives a physical broadcast control channel (PBCH) including a cyclic redundancy check (CRC) from a base station and demasking the CRC as a predetermined bit stream And a demultiplexer for recognizing the number of PRB pairs constituting a set of enhanced physical downlink control channels (E-PDCCHs) related to the UE based on the demasking, And an E-PDCCH specifying unit for specifying an E-PDCCH set based on the index of the PRB pair.

The E-PDCCH specifying unit may randomly select an index of a PRB pair in a basic combination pool including a combination of all PRB pairs. Alternatively, the E-PDCCH specifying unit may randomly select the index of the PRB pair in the basic combination pool based on the ID and the subframe index of the cell to which the UE belongs. Alternatively, the E-PDCCH specifying unit may randomly select the index of the PRB pair in a limited combination pool that is a subset of the basic combination pool including all combinations of PRB pairs.

According to another aspect of the present invention, there is provided a method of providing configuration information of a control channel in a base station in a wireless communication system based on a new carrier type (NCT). The method includes the steps of masking a predetermined bit stream to a cyclic redundancy check (CRC) of a physical broadcast control channel (PBCH), and transmitting the PBCH to a terminal .

Wherein the predetermined random bit sequence corresponds to the number of physical resource block pairs constituting an enhanced physical downlink control channel (E-PDCCH) set, and the E-PDCCH corresponds to the number of PRB pairs And the index of the PRB pair.

According to another aspect of the present invention, there is provided a base station for providing control channel configuration information in a wireless communication system based on a new carrier type (NCT). The base station includes an E-PDCCH specifying unit for specifying an E-PDCCH set based on the number of PRB pairs and an index of the PRB pair, and an arbitrary bit stream determined according to the number of PRB pairs, And a transmitter for masking a cyclic redundancy check (CRC) of a physical broadcast control channel (PBCH) and transmitting the PBCH to a mobile station.

E-PDCCH can be efficiently configured on NCT, no signaling is required, and overhead is reduced. Since interference between cells is considered, interference between E-PDCCHs in different cells can be reduced to improve overall system performance .

1 is a block diagram illustrating a wireless communication system.
2 is a flowchart illustrating a method of transmitting E-PDCCH configuration information according to an embodiment.
3 is an exemplary diagram showing a combination of PRB pairs to which the present embodiment is applied.
4 is a diagram illustrating a method for constructing a limited combination pool in accordance with one embodiment.
5 is a diagram illustrating a method for selecting a combination of three PRB pairs included in a limited combination pool according to one embodiment.
6 is a diagram illustrating a method of selecting a combination of PRB pairs according to an embodiment.
7 is a block diagram illustrating a terminal and a base station 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 symbols as possible even if 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 (Extended-PDCCH), 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, packet data, 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.

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, an E-UTRAN includes at least one base station (BS) 20 that provides a control plane and a user plane to a UE. 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 fixed station that communicates 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, a relay, and so forth. The base station 20 may provide at least one cell to the terminal. 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 a carrier aggregation (CA) is not considered, 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 source BS 21 refers to a base station for which a radio bearer is currently set with the UE 10 and a target BS 22 transmits a radio bearer to the source BS 21, Means a base station to perform a handover in order to set up a radio bearer.

The base stations 20 can be connected to each other via the X2 interface, which is used to exchange messages between the base stations 20. [ The base station 20 is connected to an Evolved Packet System (EPS), more specifically a Mobility Management Entity (MME) / S-GW (Serving Gateway) 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 40 is used to provide packet data service to the MME / S-GW 30. The PDN-GW 40 is changed depending on the purpose of communication or the service, and the PDN-GW 40 supporting the specific service can be found using APN (Access Point Name) information.

Hereinafter, a new carrier type (NCT) applied to this specification will be described in detail. When the terminal assembles a carrier wave, for example, it can aggregate an existing carrier type (set as a main serving cell) and an NCT (NCT in this case is non-stand-alone). The NCT may not transmit signals such as PBCH, PDCCH, PHICH, and PCFICH, for example. The NCT may not support transmission modes (TM) 1 to 8. That is, TM9 or TM10 can be supported in NCT. Up to 8 layers can be supported in NCT, and DCI formats 1A and 2C / 2D can be used for PDSCH transmission on NCT. The DCI formats 1A and / or 2C / 2D may be indicated via ePDCCH (enhanced PDCCH) on the NCT and may be indicated via cross-carrier scheduling from the LCT. Since the TM9 or TM10 may be supported in the NCT, a CSI reference signal RS for supporting channel state information (CSI) feedback may be supported on the NCT.

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

First, 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 if there is a main serving cell. For example, when a legacy carrier type (LCT) is set as the main serving cell in a terminal in which CA is set, non-standalone NCT secondary serving cells can be clustered together.

A non-standalone NCT can be divided into a synchronized NCT and an asynchronized NCT.

A synchronous NCT refers to an NCT operating with reference to the synchronization of another carrier (e.g., a legacy carrier). In other words, the synchronous NCT may be synchronized with other carriers in terms of time and frequency to indicate a case where a separate synchronization procedure is not required in the terminal. The synchronous NCT may not transmit PSS, SSS and CRS (and TRS, as described below). This allows overhead reduction of the common RS and PSS / SSS. In the synchronous NCT, there may be advantages such as interference mitigation, energy saving, and imporved spectral efficacy for the adjacent cell due to the reduction of the overhead, and due to the reduction of the public RSs A network provider can more flexibly utilize frequency bandwidth.

The asynchronous NCT means an NCT that can operate independently by acquiring independent synchronization regardless of other carriers (for example, a main serving cell in the form of a legacy carrier). In this case, in case of asynchronous NCT, PSS and SSS transmit the same as legacy carrier type, but CRS transmission frequency and transmission bandwidth can be small. For example, in an asynchronous NCT, a CRS may be transmitted with a period of time, in which case the CRS may be referred to as a reduced CRS (reduced CRS) or a TRS (Tracking RS) since it can only be used for synchronization purposes. Specifically, for example, the TRS can be transmitted on the basis of the CRS antenna port 0 with a 5 ms period on the time axis. Also, the TRS can be transmitted in the entire system bandwidth on the frequency axis, or only in 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 As with non-standalone NCTs, CRSs can be removed. 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 the E-PDCCH and the PDSCH in the stand-alone NCT can be performed based on the DMRS.

Third, the dormant NCT means an NCT that can enter the on and off states as the case may be. For example, the dormant NCT may be operated in the on (active), off (dormant) mode depending on the traffic state. That is, the base station can turn off power to the dormant NCT cell according to the traffic requirements of the terminal, thereby saving energy and reducing cell interference. When the dormant NCT is in the sleep mode, the base station can transmit only the cell identification signal of a longer period (for example, PSS / SSS) to the UE without transmitting the CRS to transmit the minimum signal to the UE. In this case, the cell identification signal may be called a DS (Discovery Signal).

According to the present specification, an NCT supporting a common search space based on DMRS can be provided. Here, a specific control channel is mapped to a common search space based on the DMRS, and the specific control channel may be referred to as an E-PDCCH. For example, the E-PDCCH may be transmitted on the public search space of the standalone NCT. In this case, the UE can determine the number of physical resource blocks (PRB) pairs to which a control channel (i.e., E-PDCCH) is mapped and a control channel including an index of the resource block pair ) You should know the configuration information in advance. Otherwise, the UE can not detect and decode the control channel (i.e., E-PDCCH), and consequently, the system information can not be obtained.

Accordingly, the present embodiment provides a method of acquiring configuration information of a control channel (i.e., E-PDCCH) in a wireless communication system based on NCT, a terminal performing the method, and a method of informing a terminal of configuration information of a control channel And a base station for performing the same. By successfully acquiring the configuration information of the control channel according to the present embodiment, the UE can receive SIB and other common control information (e.g., paging, random access, power control, MCCH change notification, etc.) without error. In the following embodiments, a control channel carrying common downlink control information (DCI) such as system information, paging information, and transmission power control information in a common search space based on the DMRS is called a common E-PDCCH , And a control channel carrying downlink control information in a UE specific search space (USS) is referred to as a UE-specific E-PDCCH. The E-PDCCH includes both a common E-PDCCH and a UE-specific E-PDCCH. A method of specifying an E-PDCCH set according to an embodiment of the present invention includes a common E-PDCCH set and a UE- As shown in FIG.

1. Specification of E-PDCCH set

The E-PDCCH set may be configured with K sets of E-PDCCH sets (e.g., 1? K? 2), and the E-PDCCH configuration information is information used to specify the set of E-PDCCHs. One E-PDCCH set p is defined as a group including N _RB ^Xp PRB pairs. Therefore, specifying the E-PDCCH set may have the same meaning as specifying the number of PRB pairs and a specific index constituting the E-PDCCH set. Or specifying the E-PDCCH set may have the same meaning as specifying the PRB pair constituting the E-PDCCH set. The specification of the E-PDCCH set is a procedure for determining the E-PDCCH set in the base station and the E-PDCCH set determined by the base station in the UE. Hereinafter, specifying the E-PDCCH set may be replaced with a description that specifies the E-PDCCH, or may be replaced with a description that specifies the PRB pair constituting the E-PDCCH set.

The PRB pair is divided into two slots in the time axis and one RB in the frequency axis (i.e., an area corresponding to 180 REs with RE subcarrier spacing of 15 kHz in the normal subframe) It can be defined as a corresponding resource region. The PRB pairs may be overlapped, partially overlapped, or may not overlap at all between different E-PDCCH sets.

For an E-PDCCH set to be specified, not only the number of PRB pairs N _RB ^Xp . It is necessary to determine which PRB pair among the total PRBs the N _RB ^Xp PRB pairs are specifically. For example, let N _RB ^Xp = {2, 4, 8} and let the total number of PRB pairs be 25. At this time, 25 PRB pairs can be indexed from 0 to 24. For example, when N _RB ^Xp = 4, one E-PDCCH set includes four PRB pairs. And the four PRB pairs may be given as indices 0, 4, 8, 12, for example.

When the index of the N _RB ^Xp and the PRB pair is determined, since the E-PDCCH set is specified, the terminal and the base station must know the indexes of the N _RB ^Xp and the PRB pair. To this end, the present specification discloses a method for the base station to determine the index of the N _RB ^Xp and PRB pair and notify the terminal thereof. N _RB ^Xp and the index of the PRB pair are used to specify the E-PDCCH set, these are called E-PDCCH configuration information.

2 is a flowchart illustrating a method of transmitting E-PDCCH configuration information according to an embodiment. This corresponds to an operation for a terminal attempting initial access to a base station.

Referring to FIG. 2, the base station transmits a synchronization signal (SS) to a mobile station (S200). For example, the synchronization signal includes a primary SS (PSS) and a secondary SS (SSS). The synchronization signal may include a cell ID (or a physical cell ID) of a base station, which is a signal transmitted by a terminal to perform downlink synchronization. The UE can synchronize the downlink based on the synchronization signal and acquire the cell ID included in the synchronization signal.

The base station transmits a physical broadcast channel (PBCH) to the mobile station (S205). A physical broadcast channel is a kind of physical channel, and is used to transmit a Master Information Block (MIB) commonly applied to terminals belonging to a cell. The MIB includes system information elements transmitted on a broadcast channel (BCH), which is a trasport channel. For example, the MIB may include a system information element as shown in Table 1 below.

- ASN1START MasterInformationBlock :: = SEQUENCE { dl-Bandwidth ENUMERATED {n6, n15, n25, n50, n75, n100} systemFrameNumber BIT STRING (SIZE (8)), spare BIT STRING (SIZE (10)) } - ASN1STOP

Referring to Table 1, the MIB includes a downlink bandwidth (dl-Bandwidth) and a system frame number (systemFrameNumber).

The downlink bandwidth is a transmission bandwidth in the downlink, and may be composed of N _RB ^DL RBs. For example, N _RB ^DL = {n6, n15, n25, n50, n75, n100} as shown in Table 1, and n6 means six PRB pairs. The system frame number is a number of a radio frame, and one value may be applied to all the serving cells.

The UE determines an E-PDCCH set based on at least one of a synchronization signal and a PBCH (S215).

The base station transmits the E-PDCCH to the UE based on the specified E-PDCCH set (S215). For transmission of the E-PDCCH, the E-PDCCH set must be specified in advance, and the E-PDCCH configuration information must be provided in advance to the UE for the specification of the E-PDCCH set.

In order to provide E-PDCCH configuration information, the base station may use at least one of the following procedures occurring before the E-PDCCH transmission, for example, PBCH transmission (S210) and synchronization signal transmission (S205). In other words, the base station can use the PBCH to provide the E-PDCCH configuration information to the terminal, use the synchronization signal, or use both the PBCH and the synchronization signal. In other words, it can be said that the E-PDCCH set is specified by at least one of the PBCH and the synchronization signal.

For example, N _RB ^Xp and PRB pair index included in the E-PDCCH configuration information are provided, and N _RB ^Xp is provided based on the PBCH, and the index of the PRB pair can be provided based on the PBCH and the synchronization signal. Alternatively, both N _RB ^Xp and the index of the PRB pair may be provided based on the PBCH and the synchronization signal. Alternatively, when the index of the PRB pair is determined as a function of at least one parameter, each parameter may be provided separately from the synchronization signal and the PBCH. Hereinafter, various embodiments regarding provision of indexes of N _RB ^Xp and PRB pairs are disclosed.

2. Provision of N _RB ^Xp

N _RB ^Xp may be provided to the terminal using the PBCH. The PBCH is attached with a cyclic redundancy check (CRC), which is used by the UE to detect decoding errors. The CRC may be, for example, 16 bits.

1, one embodiment provides for N _RB ^Xp in accordance with the example, the base station in the PBCH CRC N _RB ^Xp specific bit sequence (a bit stream specific to N _RB ^Xp) masking (masking) on and specific to N _RB ^Xp And transmitting the PBCH including the CRC masked by the bit string to the UE. The following table is an example of the correspondence between N _RB ^Xp and a specific bit stream.

N _RB ^Xp Bit string 2 0, 0, 0, 0, 0, 0, 0, 0, 4 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 8 0, 1, 0, 1, 0, 1, 0, 1, 0,

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 and 0 when N _RB ^Xp = 2 in the case of N _RB ^Xp = {2, 4, 8} 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0> and N _RB ^Xp = 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1 and 1 when N _RB ^Xp = 0, 1 >.

Thus, the base station can notify the terminal of N _RB ^Xp by masking a specific bit string according to N _RB ^Xp to the CRC of the PBCH and transmitting the PBCH to the terminal.

The terminal can find a bit string that demasking the bit string according to all N _RB ^Xp to the CRC of the PBCH but successfully decoded the PBCH. The terminal can obtain N _RB ^Xp of the base station from the bit string thus found.

Since the UE decodes the PBCH based on the demodulation reference signal (DMRS), the number of antenna ports for the DMRS can be predetermined to a predetermined value. Thus, according to a further embodiment, the combination of N _RB ^Xp and the number of antenna ports for the DMRS may correspond to a particular bit string.

Table 2 shows the case where N _RB ^Xp is four. When N _RB ^Xp is 4, the correspondence between N _RB ^Xp and a specific bit stream may be determined as shown in the following table.

N _RB ^Xp Bit string 2 0, 0, 0, 0, 0, 0, 0, 0, 4 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 8 0, 1, 0, 1, 0, 1, 0, 1, 0, 16 0, 1, 0, 1, 0, 1, 0, 1, 0,

Referring to Table 3, the bit sequences masked in the CRC in the case of N _RB ^Xp = 2, 4, 8 are the same as those in Table 2. However, N _RB ^Xp = 16 have been added if the bit column is masked in the CRC in this case is <1, 0,1, 0,1, 0,1, 0,1, 0,1, 0,1, 0, 1, 0>.

A bit string specific to N _RB ^Xp may be referred to as a PBCH CRC mask. The masking may be referred to as scrambling, and the demasking may be referred to as descrambling.

(2) The provision of N _RB ^Xp according to another embodiment includes transmitting a PBCH including a MIB indicating a downlink bandwidth to a base station, based on N _RB ^Xp fixed for each downlink bandwidth. That is, informing the UE of the downlink bandwidth is the same as informing N _RB ^Xp . For example, N _RB ^Xp for each downlink bandwidth may be predefined or fixed as in the following first example.

N _RB ^DL (downlink bandwidth) N _RB ^Xp 6 PRB pairs (1.5 MHz) 2 15 PRB pairs (3 MHz) 4 25 PRB pairs (5 MHz) 4 ≥ 50 PRB pairs (10, 15, 20 MHz) 8

Referring to Table 4, the downlink bandwidth is indicated by information elements in the MIB as shown in Table 1, and N _RB ^DL = {n6, n15, n25, n50, n75, n100}. If N _RB ^DL = n6, the total downlink bandwidth is a total of 6 PRB pairs, where N _RB ^Xp = 2. Similarly, if N _RB ^DL = n25, the total downlink bandwidth is a total of 25 PRB pairs, where N _RB ^Xp = 4 is defined.

On the other hand, N _RB ^Xp for each downlink bandwidth may be predefined or fixed as shown in the following second example.

N _RB ^DL (downlink bandwidth) N _RB ^Xp 6 PRB pairs (1.5 MHz) 2 15 PRB pairs (3 MHz) 2 25 PRB pairs (5 MHz) 4 ≥ 50 PRB pairs (10, 15, 20 MHz) 16

Table 5 shows the modified form of Table 4, which differs from Table 4 in that N _RB ^Xp = 2 and N _RB ^Xp = 16, respectively, when the downlink bandwidth is 15 PRB pairs or more and 50 PRB pairs or more.

This will limit the downlink bandwidth by N _RB ^Xp, since the N _RB ^Xp fixed according to each system bandwidth is N _RB degree of freedom of ^Xp is low, but not required is additional signaling. In order to increase the spectral efficiency in N _RB ^Xp , the combination of PRB pairs may be used completely or partially overlapping with UE specific search space (USS). That is, the setting of the same PRB pair or partially redundant PRB pair as the distributed E-PDCCH that can be transmitted on the CSS and the distributed or localized E-PDCCH transmission that can be transmitted on the USS may be allowed.

3. Combination design of PRB pairs

Let N _RB ^Xp = 2 for the number of PRB pairs included in the E-PDCCH set and N _RB ^DL = 6 for the downlink bandwidth. In this case, all the six PRB pairs are the candidate group of the E-PDCCH set, and the two selected PRB pairs become the E-PDCCH set. The number of cases in which two PRB pairs can be combined out of 6 PRB pairs is ₆ C ₂ = 15. Therefore, a total of 15 combinations can be obtained. For example, when the index of the six PRB pairs = {0,1,2,3,4,5}, the combination of the two PRB pairs = {{0,1}, {0,2}, {0} , 3}, {0,4}, {0,5}, {1,2}, {1,3}, {1,4}, {1,5}, {2,3}, {2,4 }, {2,5}, {3,4}, {3,5}, {4,5}}. If the index of each combination is r, 0? R? 14, and the combination corresponding to each r value can be defined as the following table, for example.

r Combination of PRB pairs r Combination of PRB pairs 0 {0,1} 8 {1,5} One {0,2} 9 {2,3} 2 {0,3} 10 {2,4} 3 {0,4} 11 {2,5} 4 {0,5} 12 {3,4} 5 {1,2} 13 {3,5} 6 {1,3} 14 {4,5} 7 {1,4}

And Table 6 is shown in the actual time / frequency resource region.

Fig. 3 is an exemplary diagram showing all combinations of PRB pairs to which the present embodiment is applied.

Referring to FIG. 3, the number of PRB pairs included in the E-PDCCH set N _RB ^Xp = 2 and N _RB ^DL = 6 according to the downlink bandwidth. Therefore, r = 0 to 14 exist, and each r indicates a combination of two specific PRB pairs. Table 6 and FIG. 3 illustrate N _RB ^Xp = 2 and N _RB ^DL = 6, but this is only an example, and the embodiments of the present invention are directed to various values of N _RB ^Xp and N _RB ^DL .

This E-PDCCH set can be configured with different N _RB ^Xp and r for each cell. That is, the PRB pairs included in the E-PDCCH set can be individually configured for each cell. For example, the E-PDCCH set of serving cell 1 may be configured with r = 0 and the E-PDCCH set of serving cell 2 may be configured with r = 1.

PDCCH set of the serving cell 1 and the serving cell 2, the E-PPDCCH set of the serving cell 1 is the PRB pair combination {1, 2}, and the E-PDCCH set of the serving cell 2 Is a PRB pair combination {2, 3}. In this case, the PRB pair index 2 belongs to the E-PDCCH set of the serving cell 1 and the E-PDCCH set of the serving cell 2 at the same time. In this case, deterioration in performance of detecting the E-PDCCH by the UE due to interference between adjacent cells . To ensure the detection performance of the E-PDCCH and minimize inter-cell interference, the base station must select a PRB pair combination that ensures that neighboring cells do not have the same pair of PRBs as possible.

Thus, the present embodiment includes the base station randomly selecting a PRB pair combination in a combination pool. The combination pool may be referred to as a combination candidate. A combination pool is a set that includes at least one PRB pair combination. The base station can select a specific combination of PRB pairs in the combination pool and configure it as an E-PDCCH set.

The combination pool may be designed to include all possible combinations of PRB pairs, or may be designed to include only selected PRB pair combinations for the purpose of artificially avoiding interference. A combination pool including PRB pair combinations in all cases is referred to as a basic combination pool, and a combination pool including only PRB pair combinations selected for the purpose of avoiding interference is referred to as a limited combination pool.

(1) PRB pair selection method based on basic combination pool

The basic combination pool contains combinations of PRB pairs in all cases. The PRB pair combinations in all cases can be calculated through N _RB ^Xp and N _RB ^DL . For example, when N _RB ^Xp = 2 and N _RB ^DL = 6, there are a total of 15 PRB pair combinations as described in Table 6 and FIG. Or, if N _RB ^Xp = 8 and N _RB ^DL = 100, then ₁₀₀ C ₈ = a total of 186,087,894,300 PRB pair combinations are present.

If the base combination pool includes 15 PRB pair combinations, 4 bits are needed to identify all PRB pair combinations. If the base combination pool includes 186,087,894,300 PRB pair combinations, 38 bits are needed to identify all PRB pair combinations. Thus, it is determined depending on N _RB ^Xp and N _RB ^DL used to design the basic combination pool.

The terminal must know N _RB ^Xp and N _RB ^DL in advance, since the base station as well as the base station must be able to generate the base combination pool by itself. Here, N _RB ^DL is information that the UE can recognize through the MIB. In the case of N _RB ^Xp , the present embodiment does not limit the method for the terminal to recognize N _RB ^Xp , and it is irrelevant based on any method. For example, the terminal may be provided with N _RB ^Xp in the manner disclosed in "2. Providing N _RB ^Xp " of this specification.

In selecting a PRB pair combination in a base combination pool by a terminal or a base station, a random selection scheme may be used to minimize inter-cell E-PDCCH interference. This is because E-PDCCH sets are configured with combinations of PRB pairs as much as possible between cells, thereby reducing inter-cell interference.

For example, the UE or the BS can select a PRB pair combination based on a random function having at least one of a cell ID, a subframe index, and an E-PDCCH set index as a variable. Here, the cell ID may be, for example, a physical cell ID, a virtual cell ID, or a small cell cluster ID. The E-PDCCH set index can be assumed to be 0 or the set index can be used when a plurality of E-PDCCH sets are set. Calculating the random function yields the index r value of a particular combination of PRB pairs. For example, a random function can be defined by the following equation.

이다. 예를 들어,

이다. 모듈로(modulo) 연산을 취하는 이유는 r의 최대값을 한정하기 위함이다. 예를 들어

이면, r은 A에 따라 14 이하의 값을 가지게 된다. Referring to Equation (1), A is a randomly determined factor by at least one of a cell ID, a subframe index, and an E-PDCCH set index,

to be. E.g,

to be. The reason for taking a modulo operation is to limit the maximum value of r. E.g

, R has a value of 14 or less according to A.

According to one embodiment, A may be defined as:

값은

값으로 요구되는 랜덤값을 생성하기 위한 비트 수이다.

인 경우, 4비트, 즉 0-15 값 중에서 랜덤하게 생성되는 값들을

값으로 모듈로 연산을 취해 최종 r값을 획득한다. c(i)는 의사 랜덤 시퀀스(pseudo random sequence)로서, 그 초기값 c_init은 다음의 수학식과 같이 정의될 수 있다.Referring to Equation 2,

The value is

This is the number of bits to generate the random value required by the value.

, 4 bits, i.e., values randomly generated from 0 to 15 values

Value to obtain the final r value. c (i) is a pseudo random sequence, and its initial value c _init can be defined by the following equation.

(즉, 서브프레임 번호에 대응)와 n_ID,m ^E-PDCCH를(셀 ID) 변수로 하는 함수에 의해 계산된다. 즉 c_init값이 서브프레임과 E-PDCCH 셋 인덱스의 셀 ID에 기반하여 랜덤하게 결정되고, 이러한 c_init를 파라미터로 하는 A 또한 서브프레임과 E-PDCCH 셋 인덱스에 기반하여 랜덤하게 결정되며, 결과적으로 A를 파라미터로 하는 r이 서브프레임과 E-PDCCH 셋 인덱스에 기반하여 랜덤하게 결정되는 것이다. PRB 쌍의 조합이 서브프레임과 E-PDCCH 셋 인덱스의 셀 ID에 기반하여 랜덤하게 결정된다. 즉 본 실시예는 E-PDCCH 셋 인덱스의 셀 ID에 추가적으로 시간축(서브프레임)에서의 간섭을 랜덤화할 수 있다. In Equation (3), n _s has a slot number of 0 to 19 as a slot number in a radio frame, and n _{ID and m} ^E-PDCCH are cell IDs corresponding to E-PDCCH indexes (m is an E-PDCCH Corresponding to the set index). Accordingly, the value c _init

(Corresponding to the sub-frame number), n _{ID, and m} ^E-PDCCH as the (cell ID) variable. That is, c _init value is randomly determined based on the cell ID of the subframe and the E-PDCCH set index, and A with the c _init parameter is also randomly determined based on the subframe and the E-PDCCH set index, Is determined randomly based on the subframe and the E-PDCCH set index. PRB pair is randomly determined based on the cell ID of the subframe and the E-PDCCH set index. That is, the present embodiment can randomize the interference in the time axis (subframe) in addition to the cell ID of the E-PDCCH set index.

On the other hand, the initial value c _init of c (i) can also be defined by the following equation.

Referring to Equation (4), n _ID ^cell is a cell ID. According to this, the combination of the PRB pairs is randomly determined based on the subframe and the cell ID. That is, the present embodiment can randomize the interference not only in the time axis (subframe) but also in the cell ID dimension. In this case, the E-PDCCH can assume only one set.

According to another embodiment, A may also be defined as: &lt; RTI ID = 0.0 &gt;

Referring to Equation (5), a PRB pair combination is selected at random using a certain arbitrary value K. K may be, for example, 31 bits or 38 bits, but the present embodiment is not limited thereto. At this time, c _init can be calculated according to Equation (3).

The m-value may be shared with the UE-specific E-PDCCH set index. This indicates that a common E-PDCCH set and a UE-specific E-PDCCH set can overlap in a single UE. Alternatively, since the public E-PDCCH set can basically only have one E-PDCCH set index (m = 0), the common E-PDCCH set can be randomly selected based on the cell ID.

(2) PRB pair selection method based on limited combination pool

The limited combination pool is a subset of the basic combination pool, and is composed of combinations of some PRB pairs among all combinations of PRB pairs included in the basic combination pool. For example, referring to FIG. 4, the basic combination pool includes combinations of PRB pairs as shown in Table 6. Among the PRB pairs, three combinations of PRB pairs {0, 3}, { 1,4}, {2,5} can be extracted. The three pairs of PRB pairs thus extracted constitute a limited combination pool, which is a subset of the basic combination pool. Within the limited combination pool, the PRB pair combination index is numbered again as r '.

In a limited combination pool, each PRB pair combination does not overlap with each other but is configured based on a uniform interval between PRBs in a PRB pair combination. This is to provide uniform frequency diversity gain and thorough interference avoidance between adjacent cells. In order to implement orthogonality or non-overlapping between PRB pair combinations, it is preferable to use a limited combination pool based on the distance (or interval) D of PRB pairs included in the PRB pair combination, . &Lt; / RTI &gt; Here, D can be determined by the following equation.

For example, when N _RB ^Xp = 2 and N _RB ^DL = 6, D = 3. That is, a limited combination pool includes a combination of three PRB pairs. And the combination of the three PRB pairs is determined by the method exemplarily illustrated in FIG.

Referring to FIG. 5, the combination number of PRB pairs included in the limited combination pool is D, i.e., 3, and the combination index r '= 0, 1, 2 of each PRB pair. Since N _RB ^Xp = 2, the combination of one PRB pair includes two PRB pairs, and since D = 3, the distance between PRB pairs is 3. For example, the combination of PRB pairs with r '= 0 is {0,3}, the combination of PRB pairs with r' = 1 is {1,4}, the combination of PRB pairs with r '= 2 is {2 , 5}. Thus, the method of constructing a limited combination pool based on N _RB ^Xp and N _RB ^DL applies the same except for two exceptional cases.

The first exceptional case is a limited combination pool with N _RB ^Xp = 4 and N _RB ^DL = 6. In this case, four PRB pairs out of the six PRB pairs form one E-PDCCH set, where D is not applied. Rather, N _RB ^Xp = 2, constitutes a limited combination of the pool when the pool is obtained from the combination, based on the limited case of ^{_{N RB DL = 6 N RB Xp}} = 4, N RB DL = 6. For example, changes ^{_{N RB Xp = 2, N RB}} DL = 6 a limited combination pool obtained in the case where, as shown in the following table of ^{_{N RB Xp = 4, N RB}} DL = 6 of a limited combined pool.

The limited combination pool (N _RB ^Xp = 2, N _RB ^DL = 6) The limited combination pool (N _RB ^Xp = 4, N _RB ^DL = 6) {0,3} {1,2,4,5} {1,4} {0,2,3,5} {2,5} {0,1,3,4}

Referring to Table 7, the combination of the first PRB pair of the limited combination pool (N _RB ^Xp = 4, N _RB ^DL = 6) corresponds to the combination of the first PRB pair of the limited combination pool (N _RB ^Xp = 2, N _RB ^DL = 6) And a PRB pair {1,2,4,5} that is prime to the combination {0,3}. The combination of the remaining PRB pairs of the combination pool (N _RB ^Xp = 4, N _RB ^DL = 6) limited by this scheme is {0,2,3,5}, {0,1,3,4} Two pairs of PRBs are overlapped between each combination.

The second exceptional case is the limited combination pool with N _RB ^Xp = 8 and N _RB ^DL = 15. In this case, eight PRB pairs out of the 15 PRB pairs form one E-PDCCH set, where D is not applied. Rather, N _RB ^Xp = 7, constitute a limited combination pool of N _RB ^Xp = 8, if N _RB ^DL = 15 on the basis of a limited combined pool obtained in the case of N _RB ^DL = 15. For example, changes ^{_{N RB Xp = 7, N RB}} DL = 15 as if the limited combination pool obtained from the following table ^{_{N RB Xp = 8, N RB}} DL = 15 combinations of a limited pool.

The limited combination pool (N _RB ^Xp = 7, N _RB ^DL = 15) The limited combination pool (N _RB ^Xp = 8, N _RB ^DL = 15) {0,2,4,6,8,10,12} {1,3,5,7,9,11,13,14} {1,3,5,7,9,11,13} {0,2,4,6,8,10,12,14}

Referring to Table 8, the combination of the first PRB pair of the limited combination pool (N _RB ^Xp = 8, N _RB ^DL = 15) is the same as that of the first PRB pair of the limited combination pool (N _RB ^Xp = 7, N _RB ^DL = 15) , {0, 2, 4, 6, 8, 10, 12} and prime pairs {1,3,5,7,9,11,13,14}. In this way, the combination of the remaining PRB pairs of the limited combination pool (N _RB ^Xp = 8, N _RB ^DL = 15) becomes {0,2,4,6,8,10,12,14} One PRB pair (index = 14) is overlapped.

If the combination pool is configured as described above, the terminal and the base station can select a combination of arbitrary PRB pairs in the limited combination pool. The terminal must know N _RB ^Xp and N _RB ^DL in advance, since the base station as well as the base station must be able to generate the base combination pool by itself. Here, N _RB ^DL is information that the UE can recognize through the MIB. In the case of N _RB ^Xp , the present embodiment does not limit the method for the terminal to recognize N _RB ^Xp , and it is irrelevant based on any method. For example, the terminal may be provided with N _RB ^Xp in the manner disclosed in "2. Providing N _RB ^Xp " of this specification.

A random selection scheme may be used to minimize inter-cell E-PDCCH interference in selecting a PRB pair combination in a combination pool with a terminal or base station limited. This is because E-PDCCH sets are configured with a combination of PRB pairs as much as possible between cells, thereby reducing inter-cell interference.

As an example, a terminal or a base station can select a PRB pair combination based on a random function having at least one of a cell ID, a subframe index and an E-PDCCH set index as a variable. Here, the cell ID may be, for example, a physical cell ID, a virtual cell ID, or a small cell cluster ID. The E-PDCCH set index may be assumed to be 0, or, when a plurality of E-PDCCH sets are set, the corresponding set index may be used. Calculating the random function yields the index r 'value of the particular PRB pair combination. For example, a random function can be defined by the following equation.

Referring to Equation (7), B is a factor randomly determined by at least one of the cell ID, the subframe index, and the E-PDCCH set index. The reason for taking a modulo operation is to limit the maximum value of r '.

On the other hand, to calculate r 'based on the limited combination pool obtained when N _RB ^Xp = 2 and N _RB ^DL = 6 and when N _RB ^Xp = 7 and N _RB ^DL = 15, the following equation .

Referring to Equation (8), the PRB pair of Equation (7) is the same as Equation (7), but a limited combination pool (N _RB ^Xp = 2, N _RB ^DL = 6 and N _RB ^Xp = 7 and N _RB ^DL = 15) Lt; RTI ID = 0.0 &gt; (7) &lt; / RTI &gt;

According to one embodiment, B may be defined as:

는 PRB 쌍의 조합 내에서 PRB 쌍들 상호간의 거리이자 제한된 풀내의 조합의 수 이다. c(i)는 의사 랜덤 시퀀스로서, 그 초기값 c_init은 다음의 수학식과 같이 정의될 수 있다.Referring to Equation 9,

Is the distance between PRB pairs within the combination of PRB pairs and the number of combinations in the limited pool. c (i) is a pseudorandom sequence, and its initial value c _init can be defined by the following equation.

(즉, 서브프레임 번호에 대응)와 n_ID,m ^E-PDCCH를 변수로 하는 함수에 의해 계산된다. 즉 c_init값이 서브프레임과 E-PDCCH 셋 인덱스의 셀 ID에 기반하여 랜덤하게 결정되고, 이러한 c_init를 파라미터로 하는 B 또한 서브프레임과 E-PDCCH 셋 인덱스의 셀 ID에 기반하여 랜덤하게 결정되며, 결과적으로 B를 파라미터로 하는 r'이 서브프레임과 E-PDCCH 셋 인덱스의 셀 ID에 기반하여 랜덤하게 결정되는 것이다. PRB 쌍의 조합이 서브프레임과 E-PDCCH 셋 인덱스의 셀 ID에 기반하여 랜덤하게 결정된다. 즉 본 실시예는 E-PDCCH 셋 인덱스의 셀 ID에 추가적으로 시간축(서브프레임)에서의 간섭을 랜덤화할 수 있다. In Equation (10), n _s has a slot number of 0 to 19 as a slot number in a radio frame, and n _{ID and m} ^E-PDCCH are cell IDs corresponding to the E-PDCCH indexes (m is an E-PDCCH Corresponding to the set index). Accordingly, the value c _init

( ^{I. E.} _, Corresponding to the subframe number), and n _{ID, m} ^E-PDCCH . That is, c _init value is randomly determined based on the cell ID of the subframe and the E-PDCCH set index, and B with this c _init parameter is determined randomly based on the cell ID of the subframe and E-PDCCH set index As a result, r 'having B as a parameter is randomly determined based on the cell ID of the subframe and the E-PDCCH set index. PRB pair is randomly determined based on the cell ID of the subframe and the E-PDCCH set index. That is, the present embodiment can randomize the interference in the time axis (subframe) in addition to the cell ID of the E-PDCCH set index.

According to another embodiment, B may also be defined as: &lt; RTI ID = 0.0 &gt;

Referring to Equation (11), a PRB pair combination is selected at random using a certain arbitrary value K. K may be, for example, 31 bits or 38 bits, but the present embodiment is not limited thereto. At this time, c _init can be calculated according to Equation (9).

The m-value may be shared with the UE-specific E-PDCCH set index. This indicates that a common E-PDCCH set and a UE-specific E-PDCCH set can overlap in a single UE. Alternatively, since the public E-PDCCH set can basically only have one E-PDCCH set index (m = 0), the common E-PDCCH set can be randomly selected based on the cell ID.

(3) PRB pair selection method based on basic combination pool and limited combination pool

Based on a limited combinatorial pool, a very small number of pairs of PRB pairs are selected at small downlink bandwidths (e.g., 1.5 or 3 MHz) and at large downlink bandwidths (e.g., 8 MHz). In the worst case, there are only two combinations of PRB pairs so that E-PDCCHs of different cells can be placed in an interference environment. Therefore, under the first condition, it is possible to apply a basic combination pool that guarantees maximum randomness to a combination of more PRB pairs, and a more efficient combination of PRB pairs by applying a limited combination pool under a second condition that does not.

As an example, the combination selection method on the PRB is based on a limited combination pool, as shown in Fig. 6, when the number of combinations of possible PRB pairs is not sufficient (assuming that the number of neighboring cells is 6 like the CRS frequency shift definition) It depends on the basic combination pool application interval, but in a sufficient case, it depends on the limited combination pool application interval.

In the case of N _RB ^Xp = 2 and N _RB ^DL = 6 in the basic combination pool applying period, the UE or the BS selects one combination index r selected randomly in a total of 15 PRB pair combinations as shown in FIG. On the other hand, in a limited combination pool applying period, it is possible to specify combinations of PRB pairs having a maximum possible frequency diversity gain and a maximum possible interference between adjacent cells with an E-PDCCH set.

As another example, in the case of N _RB ^DL = 6 and N _RB ^DL = 15, it is possible to set only the value of N _RB ^Xp = 2. Otherwise, the terminal or the base station selects a combination of PRB pairs based on the limited combination pool .

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

7, the terminal 700 includes a receiving unit 705, a terminal processor 710, and a transmitting unit 715. The terminal processor 710 further includes an E-PDCCH specifying unit 711 and a data processing unit 712.

The receiving unit 705 receives the synchronization signal and the PBCH from the base station 750. The synchronization signal includes a main synchronization signal and a sub synchronization signal. The synchronization signal may include a cell ID (or a physical cell ID) of the base station 750, which is a signal transmitted by the terminal 700 to perform downlink synchronization. The terminal 700 can synchronize the downlink based on the synchronization signal and acquire the cell ID included in the synchronization signal. The PBCH is used to transmit the MIBs commonly applied to the terminals 700 belonging to the cell. For example, the MIB may include a system information element as shown in Table 1 above.

The receiving unit 705 can find a bit string that causes the bit string according to all N _RB ^Xp to be demodulated to the CRC of the PBCH and successfully decoded the PBCH.

The E-PDCCH identifying unit 711 can specify an E-PDCCH set based on at least one of a synchronization signal and a PBCH. First, the embodiments in which the E-PDCCH identifying unit 711 obtains N _RB ^Xp are as follows.

As an example, the E-PDCCH identifying unit 711 can obtain the N _RB ^Xp intended by the base station 750 from the bit string in which the PBCH was successfully decoded in the receiving unit 705. Specifically, the E-PDCCH identifying unit 711 can perform all of the methods for obtaining N _RB ^Xp disclosed in the second section (1) of this specification.

As another example, the E-PDCCH identifying unit 711 can recognize the downlink bandwidth from the MIB and obtain the fixed N _RB ^Xp for each downlink bandwidth. Specifically, the E-PDCCH identifying unit 711 can perform all of the methods of acquiring N _RB ^Xp disclosed in Section 2. (2) of this specification.

Next, the E-PDCCH specifying unit 711 can recognize or select the PRB pair constituting the E-PDCCH set, which can be used in the case of 3. (1), 3. (2) ) Section.

The data processing unit 712 processes the received downlink data or processes the uplink data to be transmitted based on the E-PDCCH set specified by the E-PDCCH specifying unit 711.

The transmission unit 715 transmits the uplink data received from the data processing unit 712 to the base station 760.

The base station 750 includes a transmitting unit 755, a receiving unit 760, and a base station processor 770. The base station processor 770 again includes an E-PDCCH specifying unit 771 and a data processing unit 772.

The E-PDCCH identifying unit 771 can specify an E-PDCCH set. First, the embodiments in which the E-PDCCH identifying unit 771 obtains N _RB ^Xp are as follows.

As an example, the E-PDCCH identifying section 771 determines N _RB ^Xp for the E-PDCCH set. Specifically, the E-PDCCH identifying unit 771 can perform all of the methods of obtaining N _RB ^Xp disclosed in the second section (1) of this specification.

As another example, the E-PDCCH identifying unit 771 can recognize the downlink bandwidth and obtain a fixed N _RB ^Xp for each downlink bandwidth. Specifically, the E-PDCCH identifying unit 771 can perform all the methods of obtaining N _RB ^Xp disclosed in the second section of this specification.

Next, embodiments in which the E-PDCCH specifying section 771 specifies or selects a combination of PRB pairs include the methods of 3. (1), 3. (2) and 3. (3) do.

The transmitting unit 755 masks the bit string (for example, Table 2 or Table 3) determined based on the N _RB ^Xp determined by the E-PDCCH specifying unit 771 to the CRC of the PBCH and transmits the result to the terminal 700 .

The data processing section 772 processes the downlink data to be transmitted based on the E-PDCCH set specified by the E-PDCCH specifying section 771. [ The receiving unit 760 can receive the uplink data from the terminal 700.

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 (16)

A method for a UE to receive configuration information of a control channel in a wireless communication system based on a new carrier type (NCT)
Receiving a physical broadcast control channel (PBCH) including a cyclic redundancy check (CRC) from a base station;
Demasking the CRC as a predetermined bit stream;
Recognizing the number of PRB pairs constituting an enhanced physical downlink control channel (E-PDCCH) set for the UE based on the demasking; And
Identifying the E-PDCCH set based on the number of PRB pairs and the index of the PRB pair, and monitoring the E-PDCCH set. The method according to claim 1,
Wherein the index of the PRB pair is randomly selected in a basic combination pool including a combination of all PRB pairs. 3. The method of claim 2,
Wherein the index of the PRB pair is randomly selected in the basic combination pool based on the ID and the subframe index of the cell to which the terminal belongs. The method according to claim 1,
Wherein the index of the PRB pair is randomly selected in a limited combination pool that is a subset of the base combination pool including all combinations of PRB pairs. A terminal for receiving configuration information of a control channel in a wireless communication system based on a new carrier type (NCT)
A receiver for receiving a physical broadcast control channel (PBCH) including a cyclic redundancy check (CRC) from a base station and demasking the CRC as a predetermined arbitrary bit stream; And
Recognizes the number of PRB pairs (physical resource block pairs) constituting an enhanced physical downlink control channel (E-PDCCH) set related to the UE based on the demasking, And an E-PDCCH identifying unit for identifying the E-PDCCH set based on the index of the pair. 6. The method of claim 5,
Wherein the E-PDCCH specifying unit randomly selects an index of a PRB pair in a basic combination pool including a combination of all PRB pairs. The method according to claim 6,
Wherein the E-PDCCH specifying unit randomly selects an index of the PRB pair in the basic combination pool based on an ID and a subframe index of a cell to which the UE belongs. 6. The method of claim 5,
Wherein the E-PDCCH specifying unit randomly selects an index of the PRB pair in a limited combination pool which is a subset of a basic combination pool including a combination of all PRB pairs. A method for providing configuration information of a control channel by a base station in a wireless communication system based on a new carrier type (NCT)
Masking a predetermined bit stream in a cyclic redundancy check (CRC) of a physical broadcast control channel (PBCH); And
And transmitting the PBCH to a terminal,
The predetermined arbitrary bit string corresponds to the number of PRB pairs (physical resource block pair) constituting an enhanced physical downlink control channel (E-PDCCH) set,
Wherein the E-PDCCH set is specified based on the number of the PRB pairs and the index of the PRB pair. 10. The method of claim 9,
Wherein the index of the PRB pair is randomly selected in a basic combination pool including a combination of all PRB pairs. 11. The method of claim 10,
Wherein the index of the PRB pair is randomly selected in the basic combination pool based on the ID and the subframe index of the cell to which the terminal belongs. 10. The method of claim 9,
Wherein the index of the PRB pair is randomly selected in a limited combination pool that is a subset of the base combination pool including all combinations of PRB pairs. A base station for providing configuration information of a control channel in a wireless communication system based on a new carrier type (NCT)
An E-PDCCH specifying unit for specifying an E-PDCCH set based on the number of PRB pairs and the index of the PRB pair; And
Masking a predetermined bit stream according to the number of PRB pairs to a cyclic redundancy check (CRC) of a physical broadcast control channel (PBCH), and transmitting the PBCH to a terminal And a transmission unit for transmitting the data. 14. The method of claim 13,
Wherein the E-PDCCH specifying unit randomly selects an index of the PRB pair in a basic combination pool including a combination of all PRB pairs. 15. The method of claim 14,
Wherein the E-PDCCH specifying unit randomly selects an index of the PRB pair in the basic combination pool based on an ID and a subframe index of a cell to which the UE belongs. 14. The method of claim 13,
Wherein the E-PDCCH specifying unit randomly selects an index of the PRB pair in a limited combination pool that is a subset of a basic combination pool including a combination of all PRB pairs.

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