KR20160146616A - Method of receiving and transmitting multi-user control channels in wireless communication system with multiple antennas and apparatus thereof - Google Patents

Abstract

In a wireless communication system, a control channel is required to efficiently use limited resources. However, control channel resources reduce data channel resources used for transmitting data as system overhead. In an orthogonal frequency division multiplexing (OFDM) based long term evolution (LTE) system, one subframe consists of fourteen OFDM symbols, up to three OFDM symbols are used as the control channel resources, and the remaining eleven OFDM symbols are used as the data channel resources. Accordingly, in an LTE-advanced (LTE-A) system capable of transmitting more user data, system capacity increase can be restricted due to existing limited control channel resources. Therefore, increase of the control channel resources is inevitable. The present invention relates to a multi-user control channel transmitting/receiving method using a spatial division multiplexing technique in the data channel region. According to the present invention, the method comprises the following steps of: transmitting information about resource blocks; transmitting information about the number of symbols; determining a reference signal; mapping control information and the reference signal; and transmitting the mapped control information and reference signal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for transmitting and receiving a multi-user control channel in a wireless communication system using multiple antennas,

The present invention relates to a method and apparatus for transmitting and receiving a multi-user control channel for a plurality of user terminals in a wireless communication system using multiple antennas, and more particularly, to a method and apparatus for transmitting / And the definition of a control channel search space considering characteristics of the channel region.

The mobile communication system has evolved into a high-speed and high-quality wireless packet data communication system for providing data service and multimedia service apart from providing initial voice-oriented service. Recently, various mobile communication standards such as HSDPA (High Speed Downlink Packet Access), HSUPA (High Speed Uplink Packet Access), 3GPP2 High Rate Packet Data (3GPP) and IEEE 802.16 have been applied to high speed and high quality wireless packet data transmission service It was developed to support.

Existing third generation wireless packet data communication systems such as HSDPA, HSUPA, and HRPD use technologies such as Adaptive Modulation and Coding (AMC) and Channel Adaptive Scheduling to improve transmission efficiency. With the AMC method, the transmitter can adjust the amount of data to be transmitted according to the channel state. In other words, if the channel state is poor, the amount of data transmitted by the transmitter is reduced so that the reception error probability is adjusted to a desired level. If the channel state is good, the amount of data transmitted by the transmitter is increased, Can be effectively transmitted. Using the above-described channel-responsive scheduling resource management method, a transmitter selectively allocates a channel to a user terminal because it provides a service to a user terminal having a superior channel state among a plurality of user equipments (UE) Capacity increases. This increase in capacity is called a so-called multi-user diversity gain. In other words, the AMC method and the channel-responsive scheduling method are based on feedback of partial channel state information from a receiver and apply a proper modulation and coding scheme to a time point determined to be the most efficient.

Recently, studies have been actively conducted to convert Code Division Multiple Access (CDMA), which is a multiple access scheme used in the second and third generation mobile communication systems, into OFDMA (Orthogonal Frequency Division Multiple Access) in the next generation system. 3GPP and 3GPP2 have begun to standardize on evolutionary systems using OFDMA. It is known that the capacity increase can be expected in the OFDMA system as compared with the CDMA system. One of the various causes of capacity increase in the OFDMA scheme is that frequency domain scheduling can be performed on the frequency axis. As the channel gains the capacity gain by the channel adaptive scheduling method according to the time varying characteristics of the channel, more capacity gain can be obtained when the channel uses different characteristics according to the frequency.

When the AMC method and the channel responsive scheduling method are implemented, a base station adaptively allocates a given radio resource such as frequency, time, and power according to a channel state of a user terminal. The adaptive allocation state is transmitted to the user terminal through the Physical Downlink Control Channel (PDCCH), and the user terminal recognizes which radio resource is allocated to itself through the PDCCH reception.

The allocation of radio resources includes a downlink resource allocation transmitted from a base station and received by each user terminal, and an uplink resource allocation transmitted by a user terminal and received by a base station. The downlink resource allocation is adaptively performed according to the channel status reported by the user terminal and the amount of data to be transmitted to the user terminal by the base station. The base station allocates resources to the user terminals through the PDCCH, And informs what is the transmission scheme such as modulation and coding scheme. Based on the PDCCH information, the user terminal recognizes whether downlink resources are allocated to the user terminal and how the user terminal should receive the signals transmitted through the allocated resources. The uplink resource allocation is adaptively performed based on the channel state reported by the UE and the information amount of the data to be transmitted. The BS allocates resources to the user terminals through the PDCCH and allocates allocated resources To indicate whether data should be transmitted. Based on the information of the PDCCH, the user terminal recognizes whether or not the uplink resource is allocated to itself and which transmission scheme should be used if it is allocated.

The downlink control information (DCI) included in the PDCCH for downlink resource allocation is generally as follows.

UE-ID (User Equipment IDentification, hereinafter UE ID): UE ID is information for identifying whether the signal to be transmitted to the user terminal exists. Generally, since a CRC (Cyclic Redundancy Check) according to a specific UE ID is inserted in the DL control information, if the user terminal successfully restores the DL control information, the corresponding control information is recognized as information for the corresponding user terminal.

Downlink Resource Block (DL RB ) allocation information : If the user terminal has successfully recovered the DL control information, the DL RB allocation information indicates to which resource block its actual data is transmitted.

Transport Format ( TF ) : TF indicates the modulation and coding scheme of a signal to be transmitted. If AMC is applied, the user terminal must know the TF to perform the demodulation and decoding process.

Hybrid Automatic Repeat Request ( HARQ ) related information: The HARQ transmits to the transmitter whether or not the receiver has successfully received the transmission packet, and if the transmitter successfully transmits another packet and the receiver fails to receive the transmission packet, Is the operation of retransmitting the previous packet. The HARQ related information refers to HARQ related information such as whether the transmission signal is initial transmission or retransmission, HARQ process number or the like. Based on this, the user terminal decides whether to combine the current received packet with the previous received packet to decode or perform a new decoding operation Whether or not to do so.

In addition, additional information for transmitting multiple antennas, additional information for power control, additional information indicating whether or not distributed transmission, etc., may be included in the control information included in the PDCCH, that is, the DCI.

The information included in the PDCCH for uplink resource allocation is generally as follows.

The terminal identifier ( UE  ID)

Uplink Resource Block (UL RB ) allocation information : If the user terminal has successfully recovered the control information, it recognizes to which resource block to transmit data through the UL RB information.

Transport Format ( TF ) : The user terminal must know the applicable TF to generate the transmission signal according to the demodulation and decoding scheme requested by the base station.

Hybrid Automatic Repeat request ( HARQ ) related information

In addition to this, the uplink reference signal additional information for supporting the uplink spatial multiple access, the additional information indicating whether the channel is distributed or not, .

1 is a diagram illustrating a method of setting a control channel candidate group in a conventional wireless communication system.

Referring to FIG. 1, a control channel element (CCE) refers to a unit of a logical channel constituting a PDCCH. The CCE corresponds one-to-one with a set of REs (Resource Elements), which is a unit of a physical channel. The aggregation level (AL) is defined as the number of CCEs constituting the PDCCH. When the PDCCH is configured with N CCEs, the AL is N. For example, when the vowel level is composed of AL = 1 (111), AL = 2 (112), AL = 4 (113) Can be considered. Assuming that the PDCCH uses one modulation scheme, as the vowel level decreases, the number of coded bits that can be transmitted decreases. This means that the channel code rate of the PDCCH is reduced. That is, the lower the vowel level, the more control information can be transmitted by utilizing a small amount of resources, but the user terminal must receive a good channel state before it can receive successfully. The higher the vowel level, the more resources are used, while the user terminals experiencing poor channel conditions are also able to receive successfully. In order to utilize efficient resources, it is desirable to configure a control channel by lowering the vowel level to a user terminal having a good channel state and to increase the vowel level to a user terminal with poor channel state to form a control channel.

In addition, the number of information bits constituting the DCI may be different depending on the attribute of the control information. For example, in marking resource block allocation information, many bits may be used to increase the degree of freedom, and the number of bits may be reduced instead of lowering the degree of freedom. The number of information bits constituting the DCI varies depending on whether or not to include various additional information. If DCIs are constructed with different numbers of bits, they are distinguished by DCI format. Since the user terminal can not know in which DCI format the PDCCH is transmitted, this is also subject to blind decoding. It is preferable that PDCCHs of a DCI format using a large number of bits are transmitted by increasing the collection level compared to DCI format PDCCHs using a small number of bits even though they are transmitted to user terminals of the same channel state.

More specifically, eight CCEs 100 to 107 are given. This is for convenience of description, and the number of CCEs is a value that can be changed from time to time. The number of CCEs that affect the number of CCEs is a static value such as a downlink system bandwidth, a number of base station transmit antennas, a number of downlink ACK / NACK channels for supporting uplink HARQ, and a subframe And control region information in which the value changes every time.

And the PDCCH candidates corresponding to AL = 1 (111) are 120 to 127. Reference numeral 120 denotes a PDCCH configured with one CCE 0 (100), and reference numeral 127 denotes a PDCCH configured with one CCE 7 (107). The PDCCH candidates corresponding to AL = 2 (112) are 128, 129, and so on. Reference numeral 128 indicates that the PDCCH is composed of two CCEs 0 (100) and 1 (101). The PDCCH candidate corresponding to AL = 4 (113) is 132, and the reference numeral 132 is the PDCCH using four CCE 0 (100) to CCE 3 (103). There are 134 PDCCH candidates corresponding to AL = 8 (114), and the PDCCH is configured using eight such as CCE 0 (100) to CCE 7 (107).

In this case, the method of constructing the PDCCH candidates according to the collection level is based on the tree structure. And a set of PDCCH candidates consisting of a PDCCH candidate set with AL = 2 at AL = 2 and a set of PDCCH candidates with AL = 2 at AL = 4 and a set of PDCCH candidates with AL = 4 at AL = . For example, reference numeral 132 denotes a PDCCH composed of four CCEs CCE 0 to CCE 3, which is a PDCCH candidate 128 in which CCE 0 and CCE 0 are combined and a PDCCH candidate 129 in which CCE 2 and CCE 3 are combined in AL = 2. According to this tree structure, when the total number of CCEs is N_CCE, the number of PDCCHs that can be configured in the collection level AL is floor (N_CCE / AL). Here, floor (x) is a drop function indicating a maximum integer less than or equal to x.

The user terminal should attempt blind decoding in a candidate group of PDCCHs that are possible to find out the transmitted ones among the various downlink control channels. Herein, the blind decoding means that the BS can transmit the PDCCH using one of the control channel candidates defined in the control channel candidate group. The user terminal can receive the control channel information without any prior information on which control channel information is to be transmitted It means. In the conventional OFDM-based Long Term Evolution (LTE) system, the search space of the PDCCH candidate for each user terminal is defined as Equation (1) for efficient blind decoding.

&Quot; (1) "

The first position of the m-th PDCCH CCE candidates for a given _{AL = AL {(Y k +} m) mod floor (N_CCE k / AL)}, m = 0, ..., M AL -1

Where AL is the aggregation level, N_CCE _k is the total number of CCEs in the kth subframe, M _AL is the number of PDDCH candidates in the PDCCH candidate group by collection level, Y _k = (39827 XY _{k -1} ) mod 65537 and Y _-1 is the UE ID. x mod y is a function that represents the remainder of x divided by y. Knowing the first CCE location for the given AL from Equation (1), the PDCCH candidate for a given AL is the CCEs corresponding to AL from the first CCE location.

2 is a diagram illustrating a downlink subframe structure in a conventional LTE system.

Referring to FIG. 2, one subframe 215 is composed of 14 OFDM symbols 200 to 213, the first three of which are allocated for the PDCCH are the PDCCH regions 200 to 202, and the remaining An area allocated for a physical downlink data channel (PDSCH) is a PDSCH area 203 to 213. PDCCH is transmitted over the entire system band in the PDCCH regions 200 to 202, but the PDSCH is transmitted based on a resource block (RB) 214, which is a basic unit of scheduling. Here, each RB is composed of 12 subcarriers, and the total number of RBs varies depending on the system bandwidth. The PDCCH regions 200 to 202 are located at the front of the subframe 215 because the user terminal first confirms the PDCCH and then takes a micro sleep mode when there is no corresponding data, The power consumption of the user terminal is reduced in the power control units 203 to 213.

3 is a diagram illustrating an example of an RB structure of an LTE-Advanced (hereinafter, LTE-A) system.

3, a common reference signal 300 in the PDCCH region 304 is used for channel estimation for decoding of the PDCCH, and a common reference signal 300 in the PDSCH region 305 is used for a downlink channel measurement . The channel estimation for data decoding in the PDSCH region 305 uses code division multiplexing reference signal groups 301 and 302. Each of the code division reference signal groups 301 and 302 is multiplexed into a reference signal for a plurality of layers using an orthogonal code. For example, in the case of four-layer transmission, orthogonal codes of length 2 are applied to two reference signals RE that are continuous on the time axis, and two different reference signals are multiplexed for each reference signal group, The orthogonal code of length 4 is applied to the four reference signals RE spread over the time axis to multiplex the four different reference signals for each reference signal group.

Here, in the case of one or two layer transmission, since it is possible to transmit the reference signal of each layer using only one code division multiplexing reference signal group 301, the other code division multiplexing reference signal group 302 can be transmitted as data Transmission. The code division reference signal corresponding to each layer is transmitted by applying the same precoding applied to the layer. This enables decoding of data at the receiving end without information of the precoding applied at the transmitting end.

4 is a diagram for explaining a multi-user multi-input multi-output transmission method of a downlink LTE-A system.

Referring to FIG. 4, there is shown a method of transmitting data channels of multiple user terminals to the same resource using a space division multiplexing technique for transmitting multiple antennas. The space division multiplexing scheme precodes each of the data channels of a plurality of user equipments that cause mutual interference with consideration in consideration of spatial channels of user terminals, and transmits the same through the same resource. With this scheme, PDSCHs 404 to 407 of a plurality of user terminals can be transmitted through one RB 402 in the PDSCH region 401. Here, the PDSCHs 404 to 407 corresponding to the respective layers are transmitted together with the reference signal groups 301 and 302 of FIG. When decoding the PDSCHs 404 and 405 for the layer 0 and the layer 1, the channel value estimated from the code division multiplexing reference signal group 301 for the layer 0 and the layer 1 is used, When decoding the PDSCHs 406 and 407, the channel value estimated from the code division multiplexing reference signal group 302 for the layer 2 and the layer 3 is used.

The present invention relates to a method and an apparatus for transmitting / receiving a multi-user control channel in a data channel region in a wireless communication system using multiple antennas in order to solve the problem of lack of control channel resources that can be generated in an advanced multi- And define a new search space for the control channel candidate for this.

A method for transmitting / receiving a multi-user control channel in a data channel region in a multi-antenna based wireless communication system according to the present invention is based on expanding control channel resources using a space division multiplexing technique in a multi-user control channel.

According to an aspect of the present invention, there is provided a method for transmitting control channels for a plurality of user terminals. A method for transmitting a multi-user control channel according to the present invention includes the steps of: determining a control channel transmission region for each user terminal in a subframe; if the control channel transmission region is a data channel region, The method comprising the steps of: determining a control channel candidate comprising at least one symbol in the data channel region; multiplexing the control channel with a data channel and transmitting the control channel candidate to the control channel candidate; do. The method of transmitting a multi-user control channel according to the present invention includes the steps of: selecting a demodulation reference signal for the user terminal in the data channel region; and transmitting, to the control channel candidate using the demodulation reference signal, The method includes the steps of:

In order to solve the above problems, the present invention provides a method for receiving one of control channels for a plurality of user terminals. A method of receiving a multi-user control channel according to the present invention includes the steps of: determining a control channel transmission region in a subframe; determining, when the control channel transmission region is a data channel region, Determining a control channel candidate comprising at least one symbol in the data channel region, and receiving the control channel according to the number of the resource blocks in the control channel candidate. At this time, in the multi-user control channel receiving method according to the present invention, the control channel receiving process is a process of demodulating and decoding the control channel using the demodulating reference signal in the control channel candidate.

According to another aspect of the present invention, there is provided an apparatus for transmitting control channels for a plurality of user equipments. The multi-user control channel transmission apparatus according to the present invention includes a controller for determining a control channel transmission region for each user terminal in a subframe and a control channel for the user terminal if the control channel transmission region is a data channel region, And a transmitter for transmitting the control channel in the data channel region under the control of the controller. At this time, in the multi-user control channel transmission apparatus according to the present invention, the controller determines a control channel candidate composed of at least one symbol according to the number of resource blocks of the control channel in the data channel region, And the control channel is multiplexed with the data channel and transmitted. In addition, under the control of the controller, the multi-user control channel transmission apparatus according to the present invention selects a demodulation reference signal for the user terminal in the data channel region and transmits the demodulation reference signal to the control channel candidate using the demodulation reference signal And a mapping unit for mapping the control channel.

According to another aspect of the present invention, there is provided an apparatus for receiving one of control channels for a plurality of user terminals. The multi-user control channel receiving apparatus according to the present invention determines a control channel transmission region in a subframe and determines the number of resource blocks for each control channel in the data channel region if the control channel transmission region is a data channel region A controller for determining a control channel candidate comprising at least one symbol in the data channel region and a receiver for receiving the control channel according to the number of the resource blocks in the control channel candidate under the control of the controller . At this time, the multi-user control channel receiving apparatus according to the present invention further includes a decoder / demodulator for demodulating and decoding the control channel using the demodulation reference signal in the control channel candidate under the control of the controller do.

As described above, according to the present invention, a limited control channel resource problem is solved by transmitting a multi-user control channel in a data channel region using a space division multiplexing technique, and at the same time, You can expect.

1 is a diagram illustrating a method of setting a control channel candidate group in a conventional wireless communication system,
2 is a diagram illustrating a downlink subframe structure of a conventional LTE system,
3 is a diagram illustrating an example of a downlink resource block structure of an LTE-Advanced system,
4 is a diagram for explaining a downlink MU-MIMO transmission method of an LTE-Advanced system,
5 is a view for explaining a method of performing spatial division multiplexing on a plurality of control channels in a data channel region according to an embodiment of the present invention,
6 is a view for explaining a method of performing spatial division multiplexing on a plurality of control channels in a data channel region according to an embodiment of the present invention,
FIG. 7 is a flowchart illustrating a method of performing spatial division multiplexing on a plurality of control channels in a data channel region according to an embodiment of the present invention,
FIG. 8 is a flowchart illustrating a method of receiving a plurality of control channels spatially division multiplexed in a data channel region according to an embodiment of the present invention;
9 is a block diagram illustrating a configuration of a base station that transmits a multi-user control channel in a wireless communication system using multiple antennas according to an embodiment of the present invention; and
10 is a block diagram illustrating a configuration of a user terminal for receiving a multi-user control channel in a wireless communication system using multiple antennas according to an embodiment of the present invention.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

A method for transmitting / receiving a multi-user control channel in a data channel region in a multi-antenna based wireless communication system according to the present invention is based on expanding control channel resources using a space division multiplexing technique in a multi-user control channel.

The present invention proposes a transmission structure of the same control channel as that of the data channel transmission structure in order to transmit a multi-user control channel in the data channel region, and proposes a new method of defining a search space of control channel candidates for transmission and reception of the transmission structure .

In other words, in a multi-antenna based wireless communication system, problems occurring when a control channel is transmitted / received in a data channel region are a compatibility problem of a PDCCH transmission structure for a PDSCH transmission structure and a problem of reuse of a search space of a PDCCH candidate. In order to solve such a problem, in the present invention, a PDCCH transmission basic unit is adjusted from CCE to RB, and a PDCCH decoding reference signal (hereinafter, referred to as a "DeModulation Reference Signal, hereinafter referred to as DM RS, is a generalized representation of the code division multiplexing reference signal), and redefines the search space of the PDCCH candidate for transmission and reception of the changed PDCCH transmission structure.

Here, the control channel resource is a control channel region allocated for a control channel (PDCCH), and the data channel resource may be a data channel region allocated for a data channel (PDSCH). At this time, the control channel and the data channel region can be distinguished through the PCFICH. The PCFICH is a physical channel for transmitting CCFI (Control Channel Format Indicator) information. The CCFI indicates a number of OFDM symbols constituting a control channel region in a subframe as a control channel allocation indicator. Since the user terminal must first receive the CCFI to know and receive the number of symbols allocated to the control channel, the PCFICH is a channel that all user terminals must receive first in the subframe except for the case where the downlink resource is fixedly allocated . In the embodiment of the present invention described below, the control channel region refers to an area according to the number of OFDM symbols informed to the user terminal by the base station through the PCFICH among the subframes in the downlink, and the remaining area is the data channel region. In particular, in an embodiment of the present invention, an actual control channel signal may be transmitted through a data channel region.

First, according to an embodiment of the present invention, a method of transmitting a multi-user control channel in a data channel region using a space division multiplexing technique will be described. This method includes a method of transmitting and receiving in units of RBs in a data channel region and a method of transmitting and receiving using a part of RBs in a data channel region. In particular, methods for defining a search space of a PDCCH candidate for each user terminal for blide decoding of a control channel with respect to the above two methods will be described.

First Embodiment : Definition of PDCCH Candidate Search Spaces Based on Common DM RS Transmission and Control Channel Transmission in RB in Data Channel Area

5 is a diagram for explaining a method of transmitting a multi-user control channel using a spatial division multiplexing technique in units of RBs in a data channel region according to an embodiment of the present invention. In this case, the present embodiment assumes a spatial channel state in which a maximum of four layers can be transmitted to one RB resource.

5, when a PDCCH is transmitted in the RB 502 in the PDSCH region 501, not only the PDCCH of the multi-user UE but also the PDSCH of the multi-user UE are also subjected to the spatial multiplexing 503 in the corresponding RB 502, . The control channel or data channel corresponding to each of the layers 504 to 507 is decoded using the DM RS corresponding to each layer. Here, the DM RS corresponding to each layer is precoded in the same manner as the precoding of the control channel or the data channel transmitted in the corresponding RB, and each DM RS receives the code division multiplexing reference signal, the time division multiplexing reference signal, Division multiplexed reference signal. With such a DM RS, precoding information is not required to decode a control channel or a data channel. However, in transmitting the channels of the multi-user terminal with the same resource, the layer number information is required to distinguish the DM RS corresponding to each channel. In the case of control channel decoding, blind decoding is attempted on a possible layer number since there is no dictionary information of this layer number.

The base station determines whether the control channel transmission is to be performed in the data channel region based on the degree of utilization of the control channel resources of the system. When the control channel is transmitted in the data channel region, the base station performs upper signaling And instructs to receive the control channel in the data channel region. Also, the maximum number of layers can be transmitted through upper signaling. This is to reduce the cost incurred in blind decoding by limiting the number of blind decoding attempts to a possible layer number.

When a multi-user control channel is transmitted in units of RBs through the data channel region 501, a search space of a common DM RS-based PDCCH candidate for efficient blind decoding of the multi-user control channel is expressed by Equation (2) 3>.

&Quot; (2) "

The position of the first RB of the m-th PDCCH candidate for a given AL_RB

_{= AL_RB {(Y k + m} ) mod floor (N_RB k / AL_RB)}, m = 0, ..., M AL _ RB -1

Here, N_RB _k is the total number of RB at the k-th subframe, AL_RB is a bar-level unit RB, M _{AL _ RB} is the number of each specific AL_RB PDCCH candidates. Y _k uses the above-mentioned conventional variable as a random variable for each user terminal.

&Quot; (3) "

Possible DM RS numbers of each PDCCH candidate

= Y _k mod N_commonDMRS _k

At this time, if the first RB position for the given AL_RB is found from Equation (2), the PDCCH candidate for a given AL_RB is the RBs corresponding to AL_RB from the first RB position. Here, N_RB _k, AL_RB, each AL_RB by M _{AL _ RB} is predefined in view of the cost and the decoding performance required for blind decoding in the UE, N_RB _k may be differently defined for each sub-frame. This information is shared in advance by the base station and the user terminal. Equation (3) represents a DM RS number (i.e., a layer number) to be tried when attempting blind decoding on the PDCCH candidate obtained from Equation (2). N_commonDMRS _k is the maximum number of possible DM RSs (which is equal to the maximum number of possible layers) that all user terminals in the cell considers common to all RBs in the kth subframe, determined in consideration of the M _{AL _ RB} specific AL_RB each AL_RB related to the cost of the channel space and the blind decoding, and is transmitted through the upper signaling in the broadcast.

That is, the user terminals using the N_commonDMRS _k received from the base station takes a random number of DM RS UE ID based performs a blind decoding on the PDCCH candidates in the unit selected by the RB <Equation 2>. If on, will not allow the transmission of N_commonDMRS _k through the upper signaling, the user terminal will always perform blind decoding only on a fixed random number of the DM RS.

Each user terminal does not know how many layers are transmitted in the RB region for PDCCH transmission, and performs PDCCH blind decoding considering the maximum RE resource for the reference signal. That is, each user terminal removes all RE resources for the reference signal corresponding to the maximum layer transmission in PDCCH blind decoding regardless of the DM RS number obtained for blind decoding.

Second Embodiment: The control channel transmission and the RB- specific (RB-specific) DM RS based PDCCH candidate search space defined above it in RB unit from the data channel region

The second embodiment uses RB-specific DM RS-based blind decoding instead of the common DM RS-based blind decoding of the first embodiment. That is, the PDCCH candidate for each RB is obtained from Equation (2), and the RB-specific DM RS candidate is defined by Equation (4).

&Quot; (4) &quot;

Possible DM RS numbers of each PDCCH candidate

= Y _k mod N_RB_DMRS _{k , i}

At this time, if the first RB position for the given AL_RB is found from Equation (2), the PDCCH candidate for a given AL_RB is the RBs corresponding to AL_RB from the first RB position. Here, N_RB _k, AL_RB, each AL_RB by M _{AL _ RB} is predefined in view of the cost and the decoding performance required for blind decoding in the UE, N_RB _k may be differently defined for each sub-frame. This information is shared in advance by the base station and the user terminal. Equation (4) represents a DM RS number (i.e., a layer number) to be tried when attempting blind decoding on the PDCCH candidate obtained from Equation (2). Here, N_RB_DMRS _{k , i} is the maximum number of possible DM RSs (which is equal to the maximum number of possible layers) for the i-th RB or RB group in the k-th subframe, determined in consideration with each AL_RB AL_RB by M _{AL _ RB} related to the cost and is transmitted through the upper signaling in the cell broadcast to all user terminals.

That is, the user terminals obtain the random DM RS number based on the UE ID using N_RB_DMRS _{k , i} received from the base station _, and perform blind decoding on the PDCCH candidate in units of RB selected from Equation (2). If it does not allow the transmission of N_RB_DMRS _{k , i} via higher signaling, the user terminal always performs blind decoding only on a fixed DM RS number.

Each user terminal does not know how many layers are transmitted in the RB region for PDCCH transmission, and performs PDCCH blind decoding considering the maximum RE resource for the reference signal. That is, each user terminal removes all RE resources for the reference signal corresponding to the maximum layer transmission in PDCCH blind decoding regardless of the DM RS number obtained for blind decoding.

Third Embodiment : Definition of PDCCH candidate search space for UE-specific DM RS-based PDCCH transmission and RB- based control channel transmission in the data channel region

The third embodiment uses a user-specific DMRS-based blind decoding instead of the common DMRS-based blind decoding and the RB-specific DMRS-based blind decoding of the above embodiments. That is, the PDCCH candidate for each RB is obtained from Equation (2), and the user-specific DM RS candidate is defined by Equation (5).

Equation (5)

Possible DM RS numbers of each PDCCH candidate

= Y _k mod N_UE_DMRS _{k , j}

At this time, if the first RB position for the given AL_RB is found from Equation (2), the PDCCH candidate for a given AL_RB is the RBs corresponding to AL_RB from the first RB position. Here, N_RB _k, AL_RB, each AL_RB by M _{AL _ RB} is predefined in view of the cost and the decoding performance required for blind decoding in the UE, N_RB _k may be differently defined for each sub-frame. This information is shared in advance by the base station and the user terminal. Equation (5) represents a DM RS number (i.e., a layer number) to be tried when attempting blind decoding on the PDCCH candidate obtained from Equation (2). Here, N_UE_DMRS _{k , j} is the maximum number of possible DM RSs (equal to the maximum number of possible layers) for the j-th UE or UE group in the k-th subframe, determined in consideration with each AL_RB AL_RB by M _{AL _ RB} related to the cost and is transmitted to the user terminal through the upper signaling, each user terminal or a user terminal group.

That is, the user terminal obtains the random DM RS number based on the UE ID using the N_UE_DMRS _{k , j} received from the base station _, and performs blind decoding on the PDCCH candidate for each RB selected from Equation (2). If it does not allow the transmission of N_UE_DMRS _{k , j} via upper signaling, the user terminal always performs blind decoding only on a fixed random DM RS number.

Each user terminal does not know how many layers are transmitted in the RB region for PDCCH transmission, and performs PDCCH blind decoding considering the maximum RE resource for the reference signal. That is, each user terminal removes all RE resources for the reference signal corresponding to the maximum layer transmission in PDCCH blind decoding regardless of the DM RS number obtained for blind decoding.

Fourth Embodiment : Definition of a PDCCH candidate search space based on fixed DM RS-based control channel transmission and RB- based control channel transmission in a data channel region

The fourth embodiment uses fixed DM RS-based blind decoding instead of random DM RS-based blind decoding using the UE IDs of the above embodiments. That is, the PDCCH candidate for each RB is obtained from Equation (2), and the fixed DM RS candidate is defined by Equation (6).

&Quot; (6) &quot;

Possible DM RS numbers of each PDCCH candidate

= 0, 1, ..., N_DMRS _k -1

At this time, if the first RB position for the given AL_RB is found from Equation (2), the PDCCH candidate for a given AL_RB is the RBs corresponding to AL_RB from the first RB position. Here, N_RB _k, AL_RB, each AL_RB by M _{AL _ RB} is predefined in view of the cost and the decoding performance required for blind decoding in the UE, N_RB _k may be differently defined for each sub-frame. This information is shared in advance by the base station and the user terminal. Equation (6) represents a DM RS number (i.e., a layer number) to be tried when attempting blind decoding on the PDCCH candidate obtained from Equation (2). Here, N_DMRS _k is the (same as the maximum number of this possible layer) up to the number of DM RS as possible in the k-th sub-frame, and this base station is AL_RB related to the cost of spatial channels and blind decoding of the user terminal and each AL_RB M _{AL _ RB} and is transmitted to the user terminal through upper signaling.

That is, the user terminal performs blind decoding from DM RS 0 to N_DMRS _k -1 for the RB-based PDCCH candidate selected from Equation (2) using the received N_DMRS _k . If it does not allow the transmission of N_DMRS _k through upper signaling, the user terminal always performs blind decoding only on a fixed DM RS number.

Each user terminal does not know how many layers are transmitted in the RB region for PDCCH transmission, and performs PDCCH blind decoding considering the maximum RE resource for the reference signal. That is, each user terminal excludes all RE resources for the reference signal corresponding to the maximum layer transmission in the PDCCH blind decoding regardless of the DM RS number obtained for blind decoding.

Fifth Example : In the data channel area RB Control channel transmission using part of

6 is a diagram for explaining a method of transmitting a multi-user control channel using a space division multiplexing technique according to an embodiment of the present invention using a part of resources of an RB in a data channel region. In this case, the present embodiment is an example of a spatial channel situation in which a maximum of four layers can be transmitted from one RB resource.

Referring to FIG. 6, a slot 604 is composed of seven OFDM symbols, and two consecutive slots 604 are one subframe. The first slot 604 of the subframe includes a portion of the PDCCH channel region 600 and the PDSCH channel region 601. For example, if the PDCCH channel region 600 is composed of three OFDM symbols, the PDSCH channel region 601 of the first slot 604 is composed of four OFDM symbols.

The method for transmitting the multi-user control channel proposed in the embodiment of the present invention in the PDSCH area 601 in the slot 604 ahead of the RB 602 is for the micro-sleep mode. That is, the same as the purpose of designing the conventional PDCCH channel region, this provides an effect of reducing the power consumption of the user terminal. However, since the control channel transmission structure is different from the conventional data channel structure, space division multiplexing transmission with the PDSCH is difficult.

PDCCH of the multi-user terminal to the front slot 604 of the RB 602 in the PDSCH region 601 and then transmit the PDCCH. The control channels corresponding to the respective layers 605 to 608 are decoded using the DM RS corresponding to each layer. Here, the DM RS corresponding to each layer is precoded in the same manner as the precoding of the control channels 605 to 608 transmitted from the corresponding RB 602, and each DM RS receives the code division multiplexing reference signal, Multiplexed reference signal or a frequency division multiplexed reference signal. With such a DM RS, precoding information is not required to decode the control channels 605 to 608. However, in transmitting the channels of the multi-user terminal with the same resource, the layer number information is required to distinguish the DM RS corresponding to each channel. In the case of the decoding of the control channel, since there is no dictionary information of this layer number, blind decoding is attempted on a possible layer number.

The base station determines whether the control channel transmission is to be performed in the data channel region 601 based on the degree of utilization of the control channel resources of the system or whether the entire RB 602 is used if the data channel region 601 is used, It is determined whether to use the front slot 604 of the data channel region 601 and to receive the control channel in the data channel region 601 through an upper signaling to the user terminal to receive the control channel in the data channel region 601 . Also, the maximum number of layers can be transmitted through upper signaling. This is to reduce the cost incurred in blind decoding by limiting the number of blind decoding attempts to a possible layer number.

When a multi-user control channel is transmitted in the data channel region 601 through the front slot 604 of the RB 602, the search space of the PDCCH candidate for each user terminal for efficient blind decoding of the multi-user control channel, i.e., the PDCCH candidate The search space for the RB region of the PDCCH and the DM RS number of the PDCCH candidate can be defined in the same manner as in Equations (2) to (6) proposed in the first to fourth embodiments. Here, the variables N_RB _k, AL_RB, M _{AL _ RB} are predefined by a base station and a user terminal, another pre-shared, as in the above embodiments and, N_commonDMRS _k, N_RB_DMRS _{k, i,} N_UE_DMRS _{k, j,} N_DMRS _k is the The base station determines it as in each embodiment and transmits it to the user terminal through upper signaling.

Accordingly, the UE performs blind decoding using the DM RS related information received in the upper signaling for the PDCCH candidate selected from Equation (2) for decoding the PDCCH received in the PDSCH channel region 601. [ If the transmission of the DM RS related information is not allowed via the upper signaling, the user terminal always performs blind decoding only on a fixed DM RS number.

Each user terminal does not know how many layers are transmitted in the RB region for PDCCH transmission, and performs PDCCH blind decoding considering the maximum RE resource for the reference signal. That is, each user terminal excludes all RE resources for the reference signal corresponding to the maximum layer transmission in the PDCCH blind decoding regardless of the DM RS number obtained for blind decoding.

A procedure of a method of transmitting and receiving a space division multiplexed multi-user control channel in a data channel region according to an embodiment of the present invention will be described.

7 is a flowchart illustrating a method of performing spatial division multiplexing on a plurality of control channels in a data channel region according to an embodiment of the present invention.

Referring to FIG. 7, in step 700, the BS calculates the number of available RBs and the number of DM RSs for a PDSCH region in each subframe in order to apply the above-described embodiments of the present invention. The BS instructs the user terminal to receive the control channel through the data channel region in step 701 to perform the control channel reception in the data channel region using the higher signaling. At this time, the base station transmits the number of available RBs and the number of DM RSs to the user terminal using the PDSCH region for PDCCH transmission through upper signaling. In step 702, the BS determines a priority of a user terminal to be scheduled. In step 703, the BS determines control information (DCI) and control information format (DCI format) of the user terminal to be scheduled in priority order. The base station then determines in step 704 whether the PDCCH transmission region of the user terminal is a PDCCH region or a PDSCH region. At this time, the base station performs different PDCCH transmission procedures according to whether the PDCCH transmission region of the user terminal to be scheduled is the PDCCH region or the PDSCH region.

Next, if it is determined in step 704 that the PDCCH transmission region of the UE is a PDSCH, the BS determines a PDCCH candidate group for each RB-based collection level in step 708. [ And the base station phase RB based collection level and DM RS-related information in the 710 PDCCH candidates in accordance with (that _{is, N_commonDMRS k, N_RB_DMRS k, i} , N_UE_DMRS k, j, N_DMRS k) ( i.e., RB region of PDCCH candidates and the DM RS Number). Here, Equation (2) to Equation (6) used for determining the PDCCH candidate group and its PDCCH candidates in steps 708 and 710 are referred to as a hash function. Then, in step 712, the BS selects the PDCCH candidate and the DM RS that are not occupied by the user terminal of higher priority in the PDSCH region. Here, the base station can select a different DM RS from the same PDCCH candidate. In step 714, the BS performs channel coding, scrambling, and modulation in accordance with the DCI format. In step 716, the base station multiplies the DM RS and the modulated symbol by a precoding vector for spatial division multiplexing, and maps the PDSCH to a selected PDCCH candidate in the PDSCH region. At this time, the base station can transmit the PDCCH using only the front slot in the PDCCH candidate resource by applying the micro-sleep mode. In addition, if a PDCCH using a different DM RS exists in the PDCCH candidate resource selected in step 718, the base station further maps the PDCCH with the PDCCH.

If it is determined in step 704 that the PDCCH transmission region of the UE to be scheduled is a PDCCH region, the BS calculates the number of available CCEs for the PDCCH region in one subframe in step 724. [ In step 726, the BS determines a PDCCH candidate group for each CCE-based vowel level. Then, in step 728, the BS determines a CCE-based PDCCH candidate according to the collection level, and selects a PDCCH candidate not occupied by a user terminal having a higher priority in the PDCCH region in step 730. [ In step 732, the BS performs channel coding, scrambling, and modulation in accordance with the DCI format. The base station then maps the modulated symbol stream in step 734 to a selected PDCCH candidate in the PDCCH region.

In step 720, the base station performs the procedure from step 704 on the user terminal to be scheduled with the next priority. When the PDCCH mapping is completed for all user terminals to be scheduled, the BS transmits the downlink PDSCH to the user terminal after multiplexing with the downlink PDSCH in step 722.

8 is a flowchart illustrating a method of receiving a plurality of control channels according to embodiments of the present invention by space division multiplexing in a data channel region.

Referring to FIG. 8, in step 800, the user terminal acquires PDCCH transmission region information from the base station through upper signaling. When using a PDSCH region with PDCCH transmission zone, the user terminal the DM RS-related information (N_commonDMRS _k, N_RB_DMRS _{k, i,} N_UE_DMRS _{k, j,} N_DMRS _k) from the base station in step 801 and receives through the upper signaling. The user terminal recognizes the control information format (DCI format) receivable in step 802. The receivable control information format (DCI format) is set in advance through upper signaling. The user terminal determines an area for PDCCH blind decoding in step 804 based on the information obtained in step 800. [ That is, the user terminal determines whether the PDCCH transmission region is the PDCCH region or the PDSCH region.

Next, if it is determined in step 804 that the PDCCH blind decoding region is a PDSCH region, the user terminal determines the number of PDCCH candidates for each RB-based collection level in step 808. [ In step 810, the user terminal determines a candidate group for each vowel level by using the value (the number of PDCCH candidates) in the hash function. Here, the hash function means Equations (2) to (6) defining the PDCCH candidate search space in the above embodiments, and each candidate of the candidate group is represented by the RB region and the DM RS. After that, the user terminal demodulates the RB region of the PDCCH candidate and the DM RS in step 812, and then performs descrambling using the corresponding sub-frame number. Also, the user terminal performs channel decoding for each control information format (DCI format) receivable in step 814. At this time, the user terminal performs CRC check in step 816 to determine whether decoding is successful. As a result of the determination, if the decoding fails, steps 812 and 814 are repeated for the other PDCCH candidates obtained in step 810. If all of the PDCCH candidates have been decoded but decoding fails, it is determined that there is no PDCCH transmitted to the corresponding user terminal. On the other hand, if the PDCCH decoding succeeds in step 816, the user terminal performs a transmission / reception operation according to the control information (DCI) on the PDCCH in which the decoded result (successful CRC result) is obtained in step 818.

Meanwhile, if it is determined in step 804 that the PDCCH blind decoding area is a PDCCH area, the user terminal calculates the number of available CCEs for the PDCCH area in the subframe in step 820. Then, in step 822, the user terminal determines the number of PDCCH candidates for each CCE-based vowel level. In step 824, the user terminal uses the value (PDCCH candidate number) for the hash function to determine a candidate group for each vowel level. Here, the hash function means Equation (1) that defines the PDCCH candidate search space in the conventional technique. The user terminal demodulates the CCE of the PDCCH candidate in step 826 and descrambles the CCE using the corresponding subframe number. The user terminal performs channel decoding for each control information format (DCI format) receivable in step 828. At this time, the user terminal performs CRC check in step 830 to determine whether decoding is successful. As a result of the determination, if the decoding fails, steps 826 and 828 are repeated for the other PDCCH candidates obtained in step 824. If all of the PDCCH candidates have been decoded but decoding fails, it is determined that there is no PDCCH transmitted to the corresponding user terminal. On the other hand, if the PDCCH decoding succeeds in step 830, the user terminal performs a transmission / reception operation according to the control information (DCI) on the PDCCH that has successfully decoded (succeeding the CRC result) in step 818.

A configuration of an apparatus for transmitting and receiving a multi-user control channel that is space division multiplexed in a data channel region in a base station and a user terminal according to an embodiment of the present invention will be described.

First, a configuration of a base station for transmitting a control channel in a wireless communication system according to an embodiment of the present invention will be described. 9 is a block diagram illustrating a configuration of a base station that transmits control channels in a wireless communication system according to an embodiment of the present invention.

9, a BS according to an embodiment of the present invention includes a scheduler 900, a controller 902, a PDCCH hash function 904, a DCI signal generator 906, A scrambling unit 908, a CCE mapping unit 910, a channel encoder / modulator 912, a precoder 914, an RB / DM RS mapping unit RB / DM RS mapping 916, a multiplexer 918, and a transmitter (Tx Process) 902.

The scheduler 900 determines whether to allocate downlink (DL) resources and uplink (UL) resources by transmitting a PDCCH to a user terminal, and assigns priorities to the user terminals. At this time, the scheduler 900 performs this task based on the channel status reported by each user terminal. The controller 902 controls the operation of each device 904 through 916 based on the scheduler 900 decision. At this time, the determination of the scheduler 900 may be updated according to the determination of the controller 902. [ The input of the hash function device 904 depends on whether the PDCCH region is used or the PDCCH region is used for PDCCH transmission. That is, the hash function device 904 receives the number of available RBs, the number of DM RSs, the number of PDCCH candidates, and the like from the controller 902 when the PDSCH region is used for PDCCH transmission, The number of CCEs, the number of available PDCCH candidates, and the like. Then, the hash function device 904 determines the PDCCH candidate and returns the value determined by the controller 902. [

At this time, the determination of the scheduler 900 is converted into the control information DCI through the controller 902. [ The control information signal generator 906 receives the control information DCI from the controller 902 and generates a control information (DCI) signal. The scrambling / modulating unit 908 performs scrambling and modulation using the subframe number in which the data signal corresponding to the control information signal described above is transmitted. The controller 902 applies the scrambled and modulated control signal to the input of the precoder 914 when the PDCCH transmission is performed in the PDSCH region. When the PDCCH transmission is performed in the PDCCH region, the controller 902 transmits the scrambled and modulated control signal to the CCE mapper (910). The CCE mapper 910 transmits the scrambled signal on the PDCCH selected by the controller 902 among the PDCCH candidate groups determined by the hash function unit 904.

On the other hand, the code / modulator 912 channel-codes and modulates the downlink data channel signal. The controller 902 determines a precoding matrix based on the channel information of the user and applies it to the input of the precoder 914. The precoder 914 multiplies the signal received from the code / modulator 912 and the scrambling / modulation device 908 by the precoding matrix received from the controller 902. Here, the reference signal is similarly precoded. Then, the RB / DM RS mapper 916 maps control signals and data signals precoded to the RB area and the DM RS for the PDCCH candidate determined by the controller 902. Then, the multiplexer 918 multiplexes the coded and modulated data channel signals and control channel signals to generate a downlink signal. Also, the transmitter 920 transmits the downlink signal.

A configuration of a user terminal for receiving a control channel in a wireless communication system according to an embodiment of the present invention will now be described. 10 is a block diagram illustrating a configuration of a user terminal for receiving a control channel in a wireless communication system according to an embodiment of the present invention.

10, a UE according to an embodiment of the present invention includes a RX processor 1000, a de-multiplexer 1002, a CCE demapper or an RB / DM RS demapper (CCE de- mapping or RB / DM RS de-mapping 1004, a control channel decoding / demodulator 1006, a data channel decoding / demodulator 1008, a controller 1010 and a PDCCH hash function 1012 do.

The receiver 1000 receives a signal transmitted from a base station through an antenna and converts the received signal into a baseband signal. The demultiplexer 1002 demultiplexes the signal received through the receiver 1000 into a control channel and a data channel signal. At this time, the controller 1010 controls the demultiplexer 1002 when the PDCCH transmission is performed in the PDSCH region, and demultiplexes the PDSCH region to be input to the RB / DM RS demapper 1004. The input of the hash function device 1012 is different depending on whether the PDCCH region is used or the PDCCH region is used for the PDCCH transmission. That is, the hash function device 1012 receives the number of available RBs, the number of DM RSs, the number of PDCCH candidates, and the like from the controller 1010 when the PDSCH region is used for PDCCH transmission, The number of CCEs, the number of available PDCCH candidates, and the like. The hash function device 1012 then determines the PDCCH candidate and returns the value determined by the controller 1010. [ Then, the controller 1010 informs the CCE demapper or the RB / DM RS demapper 1004 of the PDCCH candidates.

Here, when the PDCCH candidate inputted from the controller 1010 is CCE-based, the CCE demapper or the RB / DM RS demapper 1004 performs CCE demapping in the PDCCH region, If the PDCCH candidate is based on RB and DM RS, the CCE demapper or RB / DM RS demapper 1004 performs RB / DM RS demapping in the PDSCH region.

On the other hand, the control channel decoder / demodulator 1006 demodulates and decodes each demultiplexed PDCCH candidate in the CCE demapper or the RB / DM RS demapper 1004 to notify the controller 1010 of the decoding success . At this time, if decoding fails for a specific PDCCH candidate, the control channel decoder / demodulator 1006 controls the CCE demapper or the RB / DM RS demapper 1004 to demultiplex Performs channel decoding and demodulation on the other PDCCH candidates, and informs the controller 1010 of the success or failure of decoding. On the other hand, if the decoding of the PDCCH is successful, the control channel decoder / demodulator 1006 informs the controller 1010 thereof. Then, the controller 1010 determines whether there is a downlink data signal transmitted to the user terminal through the decoded PDCCH. At this time, if there is a data signal of the corresponding user, the data channel decoding / demodulator 1008 demodulates and decodes the data signal extracted from the demultiplexer 1002.

According to the present invention, a limited control channel resource problem can be solved by transmitting a multi-user control channel in a data channel region using a space division multiplexing technique, and a system capacity increase due to a small control channel overhead can be expected.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of the present invention in order to facilitate the understanding of the present invention and are not intended to limit the scope of the present invention. That is, it will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible.

Claims (20)

In the control information transmission method,
Transmitting information of at least one resource block (RB) for a first control channel through upper signaling;
Transmitting information on the number of symbols for a second control channel in a subframe;
Determining a reference signal associated with the first control channel based on an identifier of the UE;
Mapping control information for the first control channel and the reference signal onto the at least one RB; And
And transmitting the mapped control information and the reference signal to the terminal. The method according to claim 1,
Wherein the control information for the first control channel and the reference signal associated with the first control channel are mapped to symbols on the at least one subframe other than the symbols for the second control channel. 3. The method of claim 2,
Wherein the control information for the first control channel and the reference signal associated with the first control channel are mapped onto a symbol previously set in the symbols excluding the symbols for the second control channel on the at least one subframe Lt; / RTI &gt; The method according to claim 1,
Wherein the control information for the first control channel and the reference signal associated with the first control channel are precoded in an even manner. The method according to claim 1,
Wherein the reference signal associated with the first control channel is determined within a predetermined number of reference signals. In the control information receiving method,
Comprising: receiving information on at least one resource block (RB) for a first control channel through upper signaling;
Receiving information on the number of symbols for a second control channel in a subframe; And
And receiving the mapped control information and the reference signal if control information for the first control channel and a reference signal associated with the first control channel are mapped onto the at least one RB,
Wherein the reference signal associated with the first control channel is determined based on a terminal identifier. The method according to claim 6,
Wherein the control information for the first control channel and the reference signal associated with the first control channel are mapped to symbols on the at least one subframe other than the symbols for the second control channel. 3. The method of claim 2,
Wherein the control information for the first control channel and the reference signal associated with the first control channel are mapped onto a symbol previously set in the symbols excluding the symbols for the second control channel on the at least one subframe Lt; / RTI &gt; The method according to claim 6,
Wherein the control information for the first control channel and the reference signal associated with the first control channel are precoded in an even manner. The method according to claim 6,
Wherein the reference signal associated with the first control channel is determined within a predetermined number of reference signals. A base station for transmitting control information in a wireless communication system,
A transmitting and receiving unit for transmitting and receiving signals to and from the terminal; And
Information on at least one resource block (RB) for a first control channel is transmitted through upper signaling, information on the number of symbols for a second control channel is transmitted in a subframe, Determining a reference signal associated with the first control channel, mapping control information for the first control channel and the reference signal onto the at least one RB, To the mobile station, to the mobile station. 12. The method of claim 11,
Wherein the control information for the first control channel and the reference signal associated with the first control channel are mapped to symbols except for the symbols for the second control channel on at least one subframe. 13. The method of claim 12,
Wherein the control information for the first control channel and the reference signal associated with the first control channel are mapped onto a symbol previously set in the symbols excluding the symbols for the second control channel on the at least one subframe . 12. The method of claim 11,
Wherein the control information for the first control channel and the reference signal associated with the first control channel are precoded in an even manner. 12. The method of claim 11,
Wherein the reference signal associated with the first control channel is determined within a predetermined number of reference signals. A terminal for receiving control information in a wireless communication system,
A transmission / reception unit for transmitting / receiving signals to / from a base station; And
Receiving information on at least one resource block (RB) for a first control channel through higher signaling, receiving information on the number of symbols for a second control channel in a subframe, And a control unit for receiving the mapped control information and the reference signal when the reference signal associated with the first control channel is mapped onto the at least one RB,
Wherein the reference signal associated with the first control channel is determined based on a terminal identifier. 17. The method of claim 16,
Wherein the control information for the first control channel and the reference signal associated with the first control channel are mapped to symbols except for the symbols for the second control channel on at least one subframe. 18. The method of claim 17,
Wherein the control information for the first control channel and the reference signal associated with the first control channel are mapped onto a symbol previously set in the symbols excluding the symbols for the second control channel on the at least one subframe . 17. The method of claim 16,
Wherein the control information for the first control channel and the reference signal associated with the first control channel are precoded in an even manner. 17. The method of claim 16,
Wherein the reference signal associated with the first control channel is determined within a predetermined number of reference signals.

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