Title of Invention: METHOD AND DEVICE FOR TRANSMITTING/RECEIVING CONTROL INFORMATION IN WIRELESS COMMUNICATION SYSTEM Abstract: Provided are a method and apparatus for transmitting and receiving control information in a wireless communication system, and the method includes receiving a physical downlink share channel (PDSCH) scheduling type indicator and a hybrid automatic repeat and request (HARQ) timing indicator from a base station (BS) and determining an HARQ timing based on the PDSCH scheduling type indicator and the HARQ timing indicator. Detailed Description: TECHNICAL FIELD The present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for smoothly providing a service in a wireless communication system. BACKGROUND ART To meet the soaring demand with respect to wireless data traffic due to the commercialization of 4th-generation (4G) communication systems, efforts have been made to develop improved 5th-generation (5G) communication systems or pre-5G communication systems. For this reason, 5G communication systems or pre-5G communication systems are also referred to as a beyond-4G-network communication systems or a post-long term evolution (LTE) systems. For higher data transmission rates, the implementation of 5G communication systems on ultra-high frequency bands (mmWave), e.g., 60 GHz, is being considered. In the 5G communication system, to alleviate propagation path loss and to increase a propagation distance in the ultra-high frequency band, beamforming, massive multi-input multi-output (MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beamforming, and large scale antenna are being discussed. In order to improve system networks, for 5G communication systems, various technologies have been developed, such as, evolved or advanced small cell, cloud radio access network (cloud RAN), ultra-dense network, device-to-device (cloud RAN), ultra-dense network, device-to-device (D2D) communication, wireless backhaul, moving network, cooperative communication, coordinated multi-point (CoMP), and interference cancellation. There are also other various schemes under development for the 5G system including, e.g., hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC), which are advanced coding modulation (ACM) schemes, and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA), which are advanced access schemes. The Internet, which is a human-oriented connectivity network where humans generate and consume information, is now evolving into the Internet of Things (IoT), where distributed entities, such as objects, exchange and process information. The Internet of Everything (IoE) has also emerged, which is a combination of IoT technology and Big Data processing technology through connection with a cloud server, etc. In order to implement IoT, technological elements, such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology, are required, and in this regard, technologies such as sensor networks, machine to machine (M2M), machine-type communication (MTC), and so forth have recently been researched for connection between things. Such an IoT environment may provide intelligent Internet technology (IT) services that create new value to human life by collecting and analyzing data generated among connected things. IoT may be applied to a variety of fields including smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, health care, smart appliances, advanced medical services, and so forth through convergence and combination between existing information technology (IT) and various industries. Thus, various attempts have been made to apply 5G communication systems to IoT networks. For example, 5G communication technology, such as a sensor network, M2M, MTC, etc., has been implemented by a scheme such as beamforming, MIMO, array antennas, and so forth. The application of cloud RAN as a Big Data processing technology may also be an example of the convergence of 3eG technology and IoT technology. As described above, various services may be provided as wireless communication systems develop, and accordingly, ways of smoothly providing such services are required. DESCRIPTION OF EMBODIMENTS Technical Problem Disclosed embodiments provide a method and apparatus for smoothly providing a service in a wireless communication system. Solution to Problem According to an embodiment, a method, performed by a user equipment (UE), of transmitting and receiving control information in a wireless communication system includes receiving a physical downlink share channel (PDSCH) scheduling type indicator and a hybrid automatic repeat and request (HARQ) timing indicator from a base station (BS) and determining an HARQ timing based on the PDSCH scheduling type indicator and the HARQ timing indicator. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 illustrates a basic structure of a time-frequency domain, which is a downlink radio resource region of a long term evolution (LTE) system or a communication system that is similar to the LTE system. FIG. 2 illustrates a downlink control channel of an LTE system or a communication system that is similar to the LTE system. FIG. 3 illustrates a transmission resource of a downlink control channel in a 5th-generation (5G) or new radio (NR) communication system. FIG. 4 illustrates an example of setting of a control region in a 5G or NR communication system. FIG. 5 illustrates a method of scheduling a downlink data channel in a 5G or NR communication system. FIG. 6 illustrates a slot structure of a 5G or NR communication system. FIG. 7 illustrates an example of a slot format structure of a 5G or NR communication system. FIG. 8 is a diagram for describing a method of determining a hybrid automatic repeat request (HARQ) timing according to an embodiment. FIG. 9 is a flowchart of an operation method of a base station (BS) and a user equipment (UE), according to an embodiment. FIG. 10 is a block diagram of a structure of a UE according to an embodiment. FIG. 11 is a block diagram of a structure of a BS according to an embodiment. BEST MODE According to an embodiment, a method, performed by a user equipment (UE), of transmitting and receiving control information in a wireless communication system includes receiving a physical downlink share channel (PDSCH) scheduling type indicator and a hybrid automatic repeat and request (HARQ) timing indicator from a base station (BS) and determining an HARQ timing based on the PDSCH scheduling type indicator and the HARQ timing indicator. In an embodiment, the PDSCH scheduling type indicator and the HARQ timing indicator may be received by the UE from the BS through at least one of upper layer signaling or downlink control information (DCI). In an embodiment, the PDSCH scheduling type indicator may include information about a monitoring period of the UE for DCI that schedules the PDSCH. In an embodiment, a scheduling type indicated by the PDSCH scheduling type indicator may include at least one of slot-based scheduling, mini-slot-based scheduling, mini-slot-based scheduling having a particular mini-slot length, or PDSCH scheduling having a specific PDSCH length. In an embodiment, the method may further include identifying, by the UE, search space information based on the scheduling type that is identified based on the PDSCH scheduling type indicator. According to an embodiment, a method, performed by a BS, of transmitting and receiving control information in a wireless communication system includes determining a PDSCH scheduling type and an HARQ timing for the PDSCH and transmitting a PDSCH scheduling type indicator corresponding to the determined PDSCH scheduling type and an HARQ timing indicator to a UE. In an embodiment, the PDSCH scheduling type indicator and the HARQ timing indicator may be transmitted to the UE through at least one of upper layer signaling or DCI, respectively. In an embodiment, the PDSCH scheduling type indicator may include information about a monitoring period of the UE for DCI that schedules the PDSCH. In an embodiment, the PDSCH scheduling type indicator and the HARQ timing indicator may be transmitted to the UE through at least one of upper layer signaling or DCI, respectively. In an embodiment, the PDSCH scheduling type indicator may include information about a monitoring period of the UE for DCI that schedules the PDSCH. In an embodiment, a scheduling type indicated by the PDSCH scheduling type indicator may include at least one of slot-based scheduling, mini-slot-based scheduling, mini-slot-based scheduling having a particular mini-slot length, or PDSCH scheduling having a preset PDSCH length. In an embodiment, the method may further include instructing the UE to identify search space information based on the PDSCH scheduling type indicator. MODE OF DISCLOSURE Hereinafter, various embodiments of the present disclosure will be disclosed with reference to the accompanying drawings. When embodiments of the present disclosure are described, technical matters that are well known in a technical field of the present disclosure and are not directly related to the present disclosure will not be described. By omitting an unnecessary description, the subject matter of the present disclosure will be more clearly described without being obscured. For the same reason, some elements will be exaggerated, omitted, or simplified in the attached drawings. The size of each element does not entirely reflect the actual size of the element. In each drawing, an identical or corresponding element will be referred to as an identical reference numeral. Advantages and features of the present disclosure and a method for achieving them will be apparent with reference to embodiments described below together with the attached drawings. However, the present disclosure is not limited to the disclosed embodiments, but may be implemented in various manners, and the embodiments are provided to complete the disclosure of the present disclosure and to allow those of ordinary skill in the art to understand the scope of the present disclosure. The present disclosure is defined by the category of the claims. Throughout the specification, an identical reference numeral will indicate an identical element. Hereinbelow, the base station is an entity that performs resource assignment of the terminal, and may be at least one of gNode B, evolved Node B (eNode B), Node B, base station (BS), a wireless access unit, a base station controller, or a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing communication functions. In the disclosure, a downlink (DL) may mean a wireless transmission path of a signal for transmission from the base station to the UE, and an uplink (UL) may mean a wireless transmission path of a signal for transmission from the UE to the base station. While the present disclosure is described by using an LTE or LTE-Advanced (LTE-A) system as an example, the embodiments of the disclosure may also be applied to other communication systems having a similar technical background or channel form. For example, a fifth-generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included in the example, and 5G described below may mean a concept including existing LTE, LTE-A, and other similar services. Also, the present disclosure may also be applied to other communication systems through some modifications within a range that does not largely depart from the scope of the disclosure based on determination of a skilled person. It will be understood that each block of the flowchart and/or block diagram illustrations, and combinations of blocks in the flowchart and/or block diagram illustrations, may be implemented by computer program instructions. These computer program instructions may also be stored in a general-purpose computer, a special-purpose computer, or a processor of other programmable data processing devices, such that the instructions implemented by the computer or the processor of the programmable data processing device produce a means for performing functions specified in the flowchart and/or block diagram block or blocks. These computer program instructions may also be stored in a computer usable or computer-readable memory that may direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer usable or computer-readable memory produce an article of manufacture including instructions that implement the function specified in the flowchart and/or block diagram block or blocks. The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process, such that the instructions that execute the computer or other programmable apparatus may provide steps for implementing the functions specified in the flowchart and/or block diagram block or blocks. In addition, each block represents a module, segment, or portion of code, which includes one or more executable instructions for implementing the specified logical function(s). It should also be noted that in other implementations, the function(s) noted in the blocks may occur out of the order indicated. For example, two blocks shown in succession may, in fact, be executed substantially concurrently or the blocks may sometimes be executed in the reverse order, depending on the functionality involved. The term ‘˜unit’ used herein refers to software or a hardware element such as a field-programmable gate array (FPGA), an application specific integrated circuit (ASIC), etc., and ‘˜unit’ plays specific roles. However, the meaning of ‘˜unit’ is not limited to software or hardware. ‘˜unit’ may advantageously be configured to reside on the addressable storage medium and configured to reproduce one or more processors. Thus, a unit may include, by way of example, components, such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functionality provided for in the components and ‘˜unit(s)’ may be combined into fewer components and ‘˜unit(s)’ or further separated into additional components and ‘˜unit(s)’. In addition, components and ‘˜unit(s)’ may be implemented to execute one or more CPUs in a device or a secure multimedia card. In the embodiments of the disclosure, ‘˜unit’ may include one or more processors. A wireless communication system has evolved from an initial one that provides a voice-oriented service to a broadband wireless communication system that provides a high-speed and high-quality packet data service, like the communication standards, such as 3GPP high speed packet access (HSPA), LTE or Evolved Universal Terrestrial Radio Access (E-UTRA), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2 high rate packet data (HRPD), Ultra Mobile Broadband (UMB), the Institute of Electrical and Electronics Engineers (IEEE) 802.16e, etc. In an LTE system as a representative example of a broadband wireless communication system, orthogonal frequency division multiplexing (OFDM) is employed in a DL and single carrier frequency division multiple access (SC-FDMA) is employed in an UL. The UL may mean a radio link through which a UE transmits data or a control signal to a base station (eNodeB or BS), and the DL means a radio link through which the base station transmits data or a control signal to the UE. The above-described multiple access scheme separates data or control information for each user by allocating and operating time-frequency resources on which the data or the control information is carried for each user, so that the time-frequency resources do not overlap each other, that is, so that orthogonality is realized. A 5G or NR communication system, that is, a post-LTE communication system, needs to freely reflect various requirements from a user and a service provider, such that a service satisfying the various requirements at the same time has to be supported. Services taken into consideration for the 5G or NR communication system may include enhanced mobile broadband (eMBB) communication, massive machine type communication (mMTC), ultra reliability low latency communication (URLLC), etc. The eMBB may aim to provide a further enhanced data transmission speed than a data transmission speed supported by existing LTE, LTE-A, or LTE-Pro. For example, in the 5G or NR communication system, with respect to one BS, the eMBB needs to provide a peak data rate of 20 Gbps in the DL and a peak data rate of 10 Gbps in the UL. Furthermore, the 5G or NR communication system should be able to provide an increased user-perceived data rate while providing the peak data rate. In order to satisfy such a requirement, various transmission and reception technologies including a further enhanced MIMO transmission technology must be improved. Moreover, the LTE system transmits a signal using a 20 MHz maximum transmission bandwidth in the 2 GHz band, whereas the 5G or NR communication system transmits a signal using a frequency bandwidth wider than 20 MHz in a frequency band of 3 to 6 GHz or greater than 6 GHz, thus satisfying the data rates required for the 5G communication system. In the 5G or NR communication system, mMTC is taken into consideration in order to support application services, such as IoT. Access by many UEs within a single cell, coverage improvement of a UE, an increased battery time, a reduction in the cost of a UE are required in order for mMTC to efficiently provide for the IoT. The IoT is attached to various sensors and various devices to provide a communication function, and thus should be able to support many UEs (e.g., 1,000,000 UEs/km2) within a cell. Furthermore, a UE supporting mMTC requires wider coverage compared to other services provided by the 5G or NR communication system because there is a high possibility that the UE may be located in a shadow area not covered by a cell, such as the underground of a building. A UE supporting mMTC needs to be a cheap UE, and requires a very long battery life time, such as 10 to 15 years, because it is difficult to frequently replace the battery of the UE. Finally, URLLC is a cellular-based wireless communication service used for mission-critical purposes. For example, URLLC may be used for services used for remote control of robots or machinery, industrial automation, unmanned aerial vehicles, remote health care, emergency alert, etc. Accordingly, communication provided by URLLC should provide very low latency and very high reliability. For example, services supporting URLLC may require air interface latency to be less than 0.5 millisecond and also a packet error rate of 10−5 or less. Accordingly, for services supporting URLLC, the 5G or NR communication system needs to provide a transmission time interval (TTI) less than that of other services, and also requires the design for allocating resources in a wide frequency band in order to secure reliability of a communication link. Three services of the above-described 5G or NR communication system, that is, eMBB, URLLC, and mMTC, may be multiplexed and transmitted in one system. In order to satisfy different requirements of the services, different transmission and reception schemes and parameters may be used between the services. In the 5G or NR communication system, both slot-based scheduling and mini-slot-based scheduling may be supported as a scheduling method for a physical downlink share channel (PDSCH). In the 5G or NR communication system, information about a hybrid automatic repeat and request (HARQ) timing (or HARQ timing information) for a PDSCH may be indicated through downlink control information (DCI) to a UE. The HARQ timing information for the PDSCH may refer to a timing to transmit UL control information including an HARQ acknowledgement (ACK) or negative ACK (NACK) for the PDSCH through a physical UL control channel or a physical UL shared channel (PUSCH). In the present disclosure, a description will be made of a method for differently determining the HARQ timing indicated by the DCI based on a PDSCH scheduling environment. More specifically, a description will be made of a mini-slot index-based HARQ timing indication method, a symbol index-based HARQ timing indication method, a HARQ timing indication method based on a PDCCH monitoring period, etc. The 5G or NR communication system supports randomization with respect to a search space of a DL control channel over time. That is, a search space at a particular point in time may be different from a search space at another point in time. In this way, a problem may be solved in which a search space of a particular UE is not available to other UEs. On the other hand, in the 5G or NR communication system, a monitoring period may be set differently for a different DCI format. For example, a DCI format A may be configured for monitoring in a period of A and a DCI format B may be configured for monitoring in a period of B. As a monitoring period varies with each DCI format, monitoring may be performed in a different search space, increasing the number of times of unnecessary blind decoding. In the present disclosure, a method for effective randomization with respect to a search space will be described. FIG. 1 illustrates a basic structure of a time-frequency domain, which is a downlink radio resource region of a long term evolution (LTE) system or a communication system that is similar to the LTE system. Referring to FIG. 1, a horizontal axis represents a time domain, and a vertical axis represents a frequency domain. A minimum transmission unit in the time domain is an OFDM symbol, in which Nsymb OFDM symbols 101 may constitute one slot 102 and two slots may constitute one subframe 103. The length of the slot 102 may be 0.5 ms, and the length of the subframe 103 may be 1.0 ms. A radio frame 104 may be a unit of the time-domain, which includes ten subframes 103. A minimum transmission unit in the frequency domain may be a subcarrier, and the bandwidth of the whole system transmission band may include NBW subcarriers 105 in total. In the time-frequency domain, a basic unit of a resource may be a resource element (RE) 106, and may be indicated as an OFDM symbol index and a subcarrier index. A resource block (RB) or a physical RB (PRB) 107 may be defined as Nsymb consecutive OFDM symbols 101 in the time domain and NRB consecutive subcarriers 108 in the frequency domain. Accordingly, one RB 107 may be composed of Nsymb×NRB REs 106. Generally, a minimum transmission unit of data may be an RB. In the LTE system, generally, Nsymb=7, NRB=12, and NBW and NRB may be proportional to the bandwidth of the system transmission band. Next, DCI in the LTE communication system and the LTE-A communication system will be described in detail. In the LTE system, scheduling information regarding DL data or UL data may be delivered to the UE from the BS through DCI. The DCI may define various formats, such that a DCI format may be determined and applied according to whether scheduling information is the scheduling information regarding the UL data or the scheduling information regarding the DL data, whether the DCI is compact DCI having small-size control information, whether spatial multiplexing using multiple antennas is applied, whether the DCI is DCI for power control, etc. For example, DCI format 1, which is scheduling control information for DL data, may be configured to include control information as below. Resource Allocation Type 0/1 Flag: used to indicate whether a resource allocation scheme is type 0 or type 1. Type 0 allocates a resource in the unit of a resource block group (RBG) by applying a bitmap scheme. In the LTE system, the basic unit of scheduling is an RB expressed with a time and frequency-domain resource, and the RBG includes a plurality of RBs and is the basic unit of scheduling in Type 0. Type 1 allocates a particular RB in the RBG. Resource Block Assignment: used to notify an RB assigned for data transmission. A resource to be expressed may be determined based on a system bandwidth and a resource assignment scheme. Modulation and Coding Scheme (MCS): used to notify a modulation scheme used for data transmission and a size of a transport block that is data to be transmitted. HARQ Process Number: used to notify a process number of HARQ. New Data Indicator: used to notify whether transmission is HARQ initial transmission or retransmission. Redundancy version: used to notify a redundancy version of HARQ. Transmit Power Control (TPC) command for Physical Uplink Control Channel (PUCCH): used to notify a TPC command for a PUCCH that is a UL control channel. The DCI may be transmitted through a physical downlink control channel (PDCCH) or an enhanced PDCCH (EPDCCH), which is a DL physical control channel, through channel coding and modulation. A cyclic redundancy check (CRC) may be added to a DCI message payload, and the CRC may be scrambled by a radio network temporary identifier (RNTI) corresponding to an identity of the UE. Depending on the purpose of the DCI message, e.g., UE-specific data transmission, power control command, random access response, etc., different RNTIs may be used. That is, the RNTI may not be explicitly transmitted and may be transmitted through CRC calculation. Upon receiving the DCI message transmitted on the PDCCH, the UE may check the CRC by using the assigned RNTI and thus determine that the DCI message is transmitted thereto when the CRC check result is correct. FIG. 2 illustrates a downlink control channel of an LTE system or a communication system that is similar to the LTE system. Referring to FIG. 2, a PDCCH 201 may be time-multiplexed with a data transmission channel, a PDSCH 203, and may be transmitted over the entire system bandwidth. A time domain of the PDCCH 201 may be expressed with the number of OFDM symbols, which is indicated to the UE by a control format indicator (CFI) transmitted through a physical control format indicator channel (PCFICH). By assigning the PDCCH 201 to a front OFDM symbol of a subframe, the UE may be allowed to decode DL scheduling allocation as fast as possible, thereby reducing a decoding delay for a DL shared channel (DL-SCH), i.e., a total DL transmission delay. One PDCCH carries one DCI message and multiple UEs may be simultaneously scheduled in the DL and the UL, such that transmission of multiple PDCCHs may be performed at the same time in each cell. A CRS 204 may be used as a reference signal for decoding the PDCCH 201. The CRS 204 may be transmitted for each subframe over the entire band, and scrambling and resource mapping may vary with a cell identity (ID). The CRS 204 is a reference signal used in common by all UEs, such that UE-specific beamforming may not be used. Thus, a multi-antenna transmission scheme for a PDCCH in LTE may be defined to open-loop transmission diversity. The number of ports of the CRS may be implicitly indicated to the UE from decoding of a physical broadcast channel (PBCH). Resource allocation of the PDCCH 201 may be based on a control channel element (CCE), in which one CCE includes nine resource element groups (REGs), i.e., a total of 36 REs. The number of CCEs required for the particular PDCCH 201 may be 1, 2, 4, or 8, which may differ with a channel coding rate of the DCI message payload. As such, different CCE numbers may be used to implement link adaptation of the PDCCH 201. The UE may detect a signal in a state of being unaware of information about the PDCCH 201, and may define a search space indicating a set of CCEs for blind decoding in LTE. The search space may include a plurality of sets in an aggregation level (AL) in each CCE, and may be implicitly defined through a function and a subframe number by a UE ID without being explicitly signaled. In each subframe, the UE may perform decoding with respect to the PDCCH 201 for all possible candidates that may be generated from CCEs in a set search space and process information which is declared to be valid to the UE through the CRC check. The search space may be classified into a UE-specific search space and a common search space. UEs in a particular group or all the UEs may investigate the common search space of the PDCCH 201 in order to receive cell-common control information such as dynamic scheduling or paging message for the system information. For example, scheduling allocation information for a UL data channel for transmission of system information block (SIB)-1 including cell operator information, etc., may be received by investigating the common search space of the PDCCH 201. In LTE, the entire PDCCH area includes a set of CCEs in a logical area, and a search space including the set of the CCEs exists. The search space is classified into the common search space and the UE-specific search space, and a search space for the LTE PDCCH may be defined as shown in Table 1. TABLE 1 The set of PDCCH candidates to monitor are defined in terms of search spaces, where a search space Sk(L) at aggregation level L ϵ {1,2,4,8} is defined by a set of PDCCH candidates. For each serving cell on which PDCCH is monitored, the C CEs corresponding to PDCCH candidate m of the search space Sk(L) are given by L {(Yk + m′)mod └NCCE,k / L┘}+i where Yk is defined below, i = 0,..,L−1. For the common search space m′ = m . For the PDCCH UE specific search space, for the serving cell on which PDCCH is monitored, if the monitoring UE is configured with carrier indicator field then m′ = m+M(L)·nCI where nCI is the carrier indicator field value, else if the monitor ing UE is not configured with carrier indicator field then m′ = m , where m = 0,...,M(L)−1. M(L) is the number of PDCCH candidates to monitor in the give n search space. Note that the carrier indicator field value is the same as ServCellIndex For the common search spaces, Yk is set to 0 for the two aggregation levels L = 4 and L = 8 . For the UE-specific search space Sk(L) at aggregation level L, the variable Yk is de fined by Yk = (A·Yk-1)mod D where Y-1 = nRNTI ≠ 0, A = 39827 , D = 65537 and k = └ns/2┘, ns is the slot number within a radio frame. The RNTI value used for nRNTI is defined in subclause 7.1 in downlink and subclause 8 in uplink. According to the above-described definition of the search space for the PDCCH, the UE-specific search space may not be explicitly signaled, but implicitly defined by a function and a subframe number by the UE ID. That is, the UE-specific search space may change with the subframe number, which may mean that the UE-specific search space may change over time, thus solving a problem where a particular UE may not use a search space due to the other UEs (a blocking problem). When all CCEs investigated by the UE are already used by other UEs scheduled in the same subframe and thus a UE may not be scheduled in the subframe, this problem may not occur in the next subframe because the search space changes over time. For example, even when UE-specific search spaces of UE 1 and UE 2 partially overlap with each other in a particular subframe, the UE-specific search spaces change for each subframe, such that overlapping in the next subframe is expected to differ from the overlapping in the particular subframe. According to the above-described definition of the search space with respect to the PDCCH, the common search space may be defined as a pre-agreed CCE set because the UEs of the particular group or all the UEs need to receive the PDCCH. That is, the common search space does not change with the ID of the UE, the subframe number, etc. The common search space exists for transmission of various system messages, but may also be used for transmission of control information of a separate UE. In this way, the common search space may be used as a solution to a phenomenon where the UE fails to be scheduled due to a lack of resources available in the UE-specific search space. The search space is a set of candidate control channels including CCEs for which the UE needs to attempt decoding in a given AL, and the UE may have a plurality of search spaces because there are several ALs where one, two, four, or eight CCEs are grouped into one group. In the LTE PDCCH, the number of PDCCH candidates the UE has to monitor in the search space may be defined according to the AL, as shown in Table 2. TABLE 2 Search space Sk(L) Number of Aggregation Size PDCCH Type level L [in CCEs] candidates M(L) UE-specific 1 6 6 2 12 6 4 8 2 8 16 2 Common 4 16 4 8 16 2 According to Table 2, the UE-specific search space supports ALs {1, 2, 4, 8} for which the numbers of PDCCH candidates provided are defined as {6, 6, 2, 2}, respectively. The common search space supports ALs {4, 8} for which the numbers of PDCCH candidates provided are defined as {4, 2}, respectively. The common search space supports the ALs {4, 8} in order to improve coverage characteristics because a system message generally has to reach a cell boundary. A DCI transmitted to the common search space is defined for a particular DCI format such as 0/1A/3/3A/1C corresponding to the purpose of power control with respect to a system message or a UE group. In the common search space, a DCI format having spatial multiplexing is not supported. A DL DCI format that has to be decoded in the UE-specific search space changes with a transmission mode set for a corresponding UE. The transmission mode is set through RRC signaling, such that an accurate subframe number is not designated regarding whether the setting is effective for the UE. Thus, the UE may operate not to lose communication by performing decoding with respect to a DCI format 1A regardless of the transmission mode. In the LTE system, DL HARQ adopts an asynchronous HARQ scheme where a data retransmission timing is not fixed. That is, when the BS is fed back with HARQ NACK from the UE in response to initial transmission data, the BS may freely determine a transmission timing for retransmission data through scheduling. The UE may perform buffering with respect to data identified as an error as a result of decoding with respect to received data for an HARQ operation, and then perform combining with next retransmission data. When the UE receives a PDSCH including DL data transmitted from the BS in a subframe n, the UE may transmit UL control information including HARQ ACK or NACK of DL data to the BS in a subframe (n+K) through a PUCCH or a PUSCH. In this case, k may be defined differently according to frequency division duplex (FDD) or time division duplex (TDD) of the LTE system and a subframe configuration thereof. For example, in an FDD LTE system, k may be fixed to 4. In a TDD LTE system, k may change with a subframe configuration and a subframe number. In data transmission through a plurality of carriers, a different k may be applied according to a TDD configuration of each carrier. For TDD, k may be determined according to a TDD UL/DL configuration as shown in Table 3. TABLE 3 UL-DL Subframe n Configuration 0 1 2 3 4 5 6 7 8 9 0 — — 6 — 4 — — 6 — 4 1 — — 7, 6 4 — — — 7, 6 4 — 2 — — 8, 7, 4, 6 — — — — 8, 7, 4, 6 — — 3 — — 7, 6, 11 6, 5 5, 4 — — — — — 4 — — 12, 8, 7, 11 6, 5, 4, 7 — — — — — — 5 — — 13, 12, 9, 8, 7, 5, 4, 11, 6 — — — — — — — 6 — — 7 7 5 — — 7 7 — In the LTE system, UL HARQ, unlike DL HARQ, adopts a synchronous HARQ scheme where a data transmission timing is fixed. That is, an UL/DL timing relationship among a PUSCH which is a physical channel for UL data transmission, a PDCCH which is a DL control channel preceding the PUSCH, and a physical hybrid indicator channel (PHICH) corresponding to the PUSCH, which is a physical channel in which a DL HARQ ACK/NACK is transmitted may be defined according to a rule described below. When the UE receives the PDCCH including the UL scheduling control information transmitted from the BS or the PHICH in which the DL HARQ ACK/NACK is transmitted in the subframe n, the UE transmits UL data corresponding to the control information through the PUSCH in the subframe (n+k). In this case, k may be defined differently according to FDD or TDD of the LTE system and a configuration thereof. For example, in the FDD LTE system, k may be fixed to 4. In the TDD LTE system, k may change with a subframe configuration and a subframe number. In data transmission through a plurality of carriers, a different k may be applied according to a TDD configuration of each carrier. For TDD, k may be determined according to a TDD UL/DL configuration as shown in Table 4. TABLE 4 TDD UL/DL subframe index n Configuration 0 1 2 3 4 5 6 7 8 9 0 4 7 6 4 7 6 1 4 6 4 6 2 6 6 3 6 6 6 4 6 6 5 6 6 4 6 6 4 7 HARQ ACK/NACK information of the PUSCH transmitted by the UE in the subframe n may be transmitted from the BS to the UE through the PHICH in the subframe (n+k). In this case, k may be defined differently according to FDD or TDD of the LTE system and a configuration thereof. For example, in the FDD LTE system, k may be fixed to 4. In the TDD LTE system, k may change with a subframe configuration and a subframe number. In data transmission through a plurality of carriers, a different k may be applied according to a TDD configuration of each carrier. For TDD, k may be determined according to a TDD UL/DL configuration as shown in Table 4. TABLE 5 TDD UL/DL subframe number n Configuration 0 1 2 3 4 5 6 7 8 9 0 4 6 4 6 1 6 4 6 4 2 4 4 3 4 4 4 4 4 4 5 4 6 7 7 7 7 5 While the wireless communication system has been described based on the LTE system in the present disclosure, the present disclosure may also be applied to various wireless communication systems such as NR, 5G, etc., without being limited to the LTE system. When the present disclosure is applied to another wireless communication system, a changed k may be applied to a system using a modulation scheme corresponding to FDD. So far, a description has been made of a method of transmitting and receiving a DL control channel and DL control information and of a search space in LTE and LTE-A. Hereinbelow, a DL control channel in a 5G or NR communication system will be described in more detail with reference to the accompanying drawings. FIG. 3 illustrates a transmission resource of a DL control channel in a 5G or NR communication system. Referring to FIG. 3, a basic unit REG 303 of a time and frequency resource constituting a control channel includes one OFDM symbol 301 along a time axis and 12 subcarriers, i.e., one RB 302 along a frequency axis. As the time-axis basic unit is assumed as one OFDM symbol 301 in configuring the basic unit of the control channel, a data channel and a control channel may be time-multiplexed in one subframe. A processing time of a user may be reduced by locating the control channel in front of the data channel, making it easy to satisfy the latency requirements. In the 5G or NR communication system, frequency multiplexing between the control channel and the data channel may be efficiently performed by configuring the frequency-axis basic unit of the control channel as the RB 302. By concatenating the REG 303 shown in FIG. 3, control channel regions of various sizes may be configured. For example, in the 5G or NR communication system, when a basic unit to which a DL control channel is allocated is a CCE 304, the CCE 304 may include multiple REGs 303. Referring to FIG. 3, the REG 303 may include 12 REs, and when the CCE 304 includes six REGs 303, it means that the CCE 304 may include 72 REs. When a DL control region is configured, a corresponding region may include multiple CCEs, and a particular DL control channel may be mapped to one CCE or multiple CCEs for transmission according to an AL in the control region. CCEs in the control region are identified by numbers which may be assigned according to a logical mapping scheme. The basic unit of the DL control channel shown in FIG. 3, i.e., the REG 303 may include both DCI-mapped REs and a region to which a DMRS 305, which is a reference signal for decoding the REs, is mapped. For example, as shown in FIG. 3, three DMRSs 305 may be transmitted in one REG 303. FIG. 4 illustrates an example of setting of a control region (control resource set (CORESET)) in a 5G or NR communication system. Referring to FIG. 4, a system bandwidth 410 is set in the frequency axis, and two control regions (a control region #1 401 and a control region #2 402) are set in one slot 420 in the time axis (in FIG. 4, it is assumed that one slot includes seven OFDM symbols). The control regions 401 and 402 may be set by a particular sub-band 403 in the entire system bandwidth 410 in the frequency axis. In the time axis, the control regions 401 and 402 may be set by one OFDM symbol or multiple OFDM symbols, which may be defined as a control resource set duration 404. In FIG. 4, the control region #1 401 is set by a control resource set duration of two OFDM symbols, and the control region #2 is set by a control resource set duration of one OFDM symbol. The control region in the 5G or NR system may be set by upper layer signaling from the BS to the UE (e.g., system information, a master information block (MIB), radio resource control (RRC) signaling, etc.). Setting of the control region in the UE may mean providing information such as a position of the control region, a sub-band, resource allocation of the control region, a length of the control region, etc. For example, information provided below may be included. TABLE 6 Configuration Information 1. Frequency-Axis RB Allocation Information Configuration Information 2. Control Region Start Symbol Configuration Information 3. Control Region Symbol Length Configuration Information 4. REG Bundling Size Configuration Information 5. Transmission Mode (Interleaved Transmission Scheme or Non-Interleaved Transmission Scheme) Configuration Information 6. DMRS Configuration Information Configuration Information 7. Search Space Type (Common Search Space, Group-Common Search Space, UE-Specific Search Space) Configuration Information 8. Monitoring Period Others In addition to the above-described setting information, various information required for transmission of a DL control channel may be set in the UE. FIG. 5 illustrates a method of scheduling a DL data channel in a 5G or NR communication system. Referring to FIG. 5, in the 5G or NR communication system, a position of a DMRS may differ with a mapping type of a PDSCH. In FIG. 5, a PDSCH mapping type A 510 may correspond to, for example, slot-based scheduling, and a PDSCH mapping type B 520 may correspond to non-slot-based or mini-slot-based scheduling. Slot-based scheduling may correspond to a scheme in which the PDSCH is scheduled over one slot 500, and non-slot-based or mini-slot-based scheduling may correspond to a scheme in which the PDSCH is scheduled over one mini-slot 508 set by the particular number of symbols. Referring to FIG. 5, in the 5G or NR communication system, two DMRSs, i.e., a first DMRS 501 (also referred to as the first DMRS or a front loaded DMRS) and a second DMRS 502 (also referred to as the second DMRS or an additional DMRS) are supported. The first DMRS 501 enables fast channel estimation in decoding the PDSCH, thus being introduced to the 5G or NR communication system to shorten a processing time. The second DMRS 502 has been introduced to the 5G or NR communication system to improve channel estimation performance in the UE moving fast and compensate for and track phase distortion. For PDSCH decoding, at least the first DMRS 501 may be transmitted, and the second DMRS 502 may be additionally transmitted according to a configuration of the BS. The second DMRS 502 may be repeatedly transmitted in the same pattern as the first DMRS 501. A position of a symbol in which the first DMRS 501 is transmitted may differ with a mapping type of the PDSCH. For a PDSCH mapping type A 510, the first DMRS 501 may be transmitted in the third OFDM symbol (or fourth OFDM symbol). For a PDSCH mapping type B 520, the first DMRS 510 may be transmitted in the first OFDM symbol of a resource in which the PDSCH is scheduled. A position of a symbol in which the second DMRS 502 is transmitted may be transmitted in a fixed OFDM symbol, may be set by the BS, may be indicated to the UE in downlink control information (DCI), and may also be transmitted in various positions without being limited thereto. In FIG. 5, for the PDSCH mapping type A 510, the first DMRS 501 is transmitted in the third OFDM symbol 504 and the fourth OFDM symbol 505, and the second DMRS 502 is transmitted in the tenth OFDM symbol 506 and the eleventh OFDM symbol 507. FIG. 6 illustrates a slot structure of a 5G or NR communication system. Referring to FIG. 6, an example of a structure of a frame 600, a subframe 601, and a slot 602 is illustrated. One frame 600 may be defined as 10 ms. One subframe 601 may be defined as 1 ms, such that one frame 600 may include a total of ten subframes 601. One slot 602 may be defined as 14 OFDM symbols. One subframe 601 may include one slot or a plurality of slots 602, and the number of slots 602 per subframe 601 may vary with set values μ 605 and 606 for a subcarrier interval. An example of FIG. 6 shows μ=0 605 and μ=1 606 as the set values for the subcarrier interval. For μ=0 605, one subframe 601 may include one slot 602, and for μ=1 606, one subframe 601 may include two slots 603. When the number of slots 602 per subframe 601 is defined as Nslot, the number of slots 602 per frame 600, Mslot, may be 10*Nslot (Mslot=10*Nslot). Nslot and Mslot corresponding to the set values for the subcarrier interval may be defined as shown in Table 7. TABLE 7 Number of Slots per Subframe Slot per M (NS|Ot) Frame (MS|ot) 0 1 10 1 2 20 2 4 40 3 8 80 4 16 160 5 32 320 A slot index in one frame 600 may be determined by Mslot. That is, the slot index may be defined as {0, 1, 2, . . . , Mslot−2}. In FIG. 6, for μ=0 605, Mslot=10 according to Table 7, such that a total of 10 slot indices for the slots 602 in one frame 600 may be defined as islot∈{0, 1, 2, . . . , 9}. Likewise, for μ=1 606, Mslot=20 according to Table 7, such that a total of 20 slot indices for the slots 603 in one frame 600 may be defined as islot∈{0, 1, 2, . . . , 19}. Next, a description will be made of a slot format considered in the 5G or NR communication system with reference to FIG. 7. FIG. 7 illustrates an example of a slot format structure of a 5G or NR communication system. In the 5G or NR communication system, one frame 701 may include 14 OFDM symbols 702. Each OFDM symbol in the slot may be used as one of a downlink symbol 703, an uplink symbol 705, and an unknown symbol 704. When a symbol is the downlink symbol 703, it may mean that transmission from the BS to the UE occurs in the symbol, i.e., transmission of the BS and reception of the UE occur in the symbol. When a symbol is the uplink symbol 705, it may mean that transmission from the UE to the BS occurs in the symbol, i.e., transmission of the UE and reception of the BS occur in the symbol. When a symbol is the unknown symbol 704, it may mean that any transmission or reception does not occur between the BS and the UE in the symbol. However, the unknown symbol 704 may be overridden by another DCI, and in this case, may be used for a particular purpose indicated by information included in an indicator of the DCI. One slot may include a combination of the downlink symbol 703, the uplink symbol 705, and the unknown symbol 704, and a particular combined form may be
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