Method and apparatus for changing uplink-downlink configuration in a wireless communication system

Abstract

A method and apparatus for changing an uplink-downlink configuration in a wireless communication system are disclosed. The method can include transmitting uplink-downlink configuration information indicating a first uplink-downlink configuration to a user equipment, transmitting a change indicator indicating a second uplink-downlink configuration to the user equipment, determining whether an uplink-downlink direction is changed within a specific frequency domain resource according to a change from the first uplink-downlink configuration to the second uplink-downlink configuration, and communicating with the user equipment on the frequency domain resource according to the second uplink-downlink configuration when the uplink-downlink direction is changed after a predetermined change delay time elapses from the transmitting of the change indicator.

Description

TECHNICAL FIELD

[0001] The disclosure relates to a method and device for changing an uplink-downlink configuration in a wireless communication system. BACKGROUND

[0002] To meet the demand for wireless data traffic having increased since 4th-generation (4G) communication systems came to the market, efforts are ongoing to develop enhanced 5th-generation (5G) communication systems or pre-5G communication systems. For this reason, 5G communication systems or pre-5G communication systems are also called beyond 4G network communication systems or post long-term evolution (LTE) systems.

[0003] To achieve a higher data transmission rate, 5G communication systems are considered to be implemented on ultra-high frequency bands (mmWave) such as 60 GHz. To mitigate path loss on ultra-high frequency bands and increase a range of radio waves, 5G communication systems consider the following techniques: beamforming, massive multiple-input multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beam forming, and large scale antenna.

[0004] Various technologies for enabling 5G communication systems to have enhanced networks, such as evolved or advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile network, cooperative communication, coordinated multi-point (CoMP), and reception interference cancellation, are also being developed.

[0005] For 5G systems, other various schemes are also being developed, e.g., hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) as an advanced coding modulation (ACM) scheme, and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as an advanced access scheme.

[0006] The Internet, which is a human centered connectivity network where humans generate and consume information, is now evolving to the Internet of Things (IoT) where distributed entities, such as things, exchange and process information without human intervention. The Internet of Everything (IoE), which is a combination of the IoT technology and the Big Data processing technology through connection with a cloud server, has emerged as a new paradigm for the IoT application. As technology elements, such as "sensing technology", "wired / wireless communication and network infrastructure", "service interface technology", and "security technology" have been demanded for IoT implementation, a sensor network, a Machine-to-Machine (M2M) communication, Machine Type Communication (MTC), and so forth have been researched. Such an IoT environment can provide intelligent Internet technology services that create a new value through collection and analysis of data generated from connected things. The IoT can be applied to a variety of fields including smart home, smart building, smart city, smart car or connected cars, smart grid, health care, smart appliances, and advanced medical services through convergence and combination of existing Information Technology (IT) and various industrial applications.

[0007] Accordingly, various efforts have been made to apply the 5G communication system to the IoT network. For example, technologies such as a sensor network, Machine Type Communication (MTC), and Machine-to-Machine (M2M) communication can be implemented by beamforming, MIMO, and array antennas. Application of a cloud Radio Access Network (RAN) as the above-described Big Data processing technology can also be considered an example of convergence between the 3eG technology and the IoT technology.

[0008] As described above, as wireless communication systems evolve to provide various services, methods for smoothly providing such services are required. In particular, techniques for flexibly allocating uplink and downlink resources in the time and frequency domains are required for additional coverage expansion. SUMMARY

[0009] TECHNICAL PROBLEM

[0010] Embodiments of the disclosure provide a method and device for changing an uplink-downlink configuration in a wireless communication system.

[0011] The disclosure provides a method and device for applying a changed uplink-downlink configuration when an uplink-downlink configuration is changed.

[0012] The disclosure provides a method and device for applying a delay before starting a transmission / reception operation according to a changed uplink-downlink configuration.

[0013] The disclosure provides a method and device for applying a changed uplink-downlink configuration when a change between uplink and downlink occurs in a specific frequency resource due to a change in uplink-downlink configuration.

[0014] The disclosure provides a method and device for applying a changed uplink-downlink configuration after a delay according to a predetermined condition when the uplink-downlink configuration is changed.

[0015] Solution

[0016] According to an embodiment of the disclosure, a method performed by a base station configured to change an uplink-downlink configuration in a wireless communication system can include transmitting, to a UE, uplink-downlink configuration information indicating a first uplink-downlink configuration, transmitting, to the UE, a change indicator indicating a second uplink-downlink configuration, determining whether an uplink-downlink direction is changed in a specific frequency domain resource based on a change from the first uplink-downlink configuration to the second uplink-downlink configuration, and communicating with the UE on the frequency domain resource according to the second uplink-downlink configuration after a predetermined change delay time elapses from the transmitting of the change indicator based on the uplink-downlink direction being changed.

[0017] According to an embodiment of the disclosure, a method performed by a UE configured to change an uplink-downlink configuration in a wireless communication system can include receiving, from a base station, uplink-downlink configuration information indicating a first uplink-downlink configuration, receiving, from the base station, a change indicator indicating a second uplink-downlink configuration, determining whether an uplink-downlink direction is changed in a specific frequency domain resource based on a change from the first uplink-downlink configuration to the second uplink-downlink configuration, and communicating with the base station on the frequency domain resource according to the second uplink-downlink configuration after a predetermined change delay time elapses from the transmitting of the change indicator based on the uplink-downlink direction being changed.

[0018] According to an embodiment of the disclosure, an apparatus of a base station configured to change an uplink-downlink configuration in a wireless communication system can include a transceiver configured to transmit, to a UE, uplink-downlink configuration information indicating a first uplink-downlink configuration, and transmit, to the UE, a change indicator indicating a second uplink-downlink configuration; and a processor configured to determine whether an uplink-downlink direction is changed in a specific frequency domain resource based on a change from the first uplink-downlink configuration to the second uplink-downlink configuration, and control the transceiver to communicate with the UE according to the second uplink-downlink configuration after a predetermined change delay time elapses from the transmission of the change indicator based on the uplink-downlink direction being changed.

[0019] According to an embodiment of the disclosure, an apparatus of a UE configured to change an uplink-downlink configuration in a wireless communication system can include a transceiver configured to receive, from a base station, uplink-downlink configuration information indicating a first uplink-downlink configuration, and receive, from the base station, a change indicator indicating a second uplink-downlink configuration; and a processor configured to determine whether an uplink-downlink direction is changed in a specific frequency domain resource based on a change from the first uplink-downlink configuration to the second uplink-downlink configuration, and control the transceiver to communicate with the base station according to the second uplink-downlink configuration after a predetermined change delay time elapses from the transmission of the change indicator based on the uplink-downlink direction being changed.

[0020] Advantageous Effects

[0021] According to the disclosed embodiments, an uplink-downlink configuration can be effectively changed in a wireless communication system. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a view illustrating a basic structure of a time domain and a frequency domain in a wireless communication system;

[0023] Figure 2 FIG. 2 is a view illustrating an example of a slot structure used in a wireless communication system;

[0024] Figure 3 FIG. 3 is a view illustrating an example of a configuration of a bandwidth part (BWP) in a wireless communication system;

[0025] Figure 4 FIG. 4 is a view illustrating an example of a control resource set in which a downlink control channel is transmitted in a wireless communication system;

[0026] Figure 5is a view showing a structure of a time-frequency resource constituting a downlink control channel in a wireless communication system;

[0027] Figure 6 is a view showing an example of an uplink-downlink configuration in a wireless communication system;

[0028] Figure 7a and Figure 7b is a view showing an example of an uplink-downlink configuration in an XDD system flexibly dividing uplink and downlink resources in a time domain and a frequency domain according to an embodiment of the disclosure;

[0029] Figure 8 is a view showing an example of an uplink-downlink configuration in a full-duplex communication system flexibly dividing uplink and downlink resources in a time domain and a frequency domain according to an embodiment of the disclosure;

[0030] Figure 9 is a view showing a structure of a transceiver supporting a full-duplex scheme according to an embodiment of the disclosure;

[0031] Figure 10 is a view showing an example of self-interference between uplink frequency resources and downlink frequency resources in an XDD system according to an embodiment of the disclosure;

[0032] Figure 11 is a view showing an example of an uplink-downlink configuration in a time domain and a frequency domain using a pattern in a time domain in an XDD system according to an embodiment of the disclosure;

[0033] Figure 12 is a view showing an example of an uplink-downlink configuration in a time domain and a frequency domain using a pattern in a frequency domain in an XDD system according to an embodiment of the disclosure;

[0034] Figure 13 is a view showing an example of uplink-downlink configuration change according to an embodiment of the disclosure;

[0035] Figure 14 is a flowchart showing an operation procedure of a base station according to an embodiment of the disclosure;

[0036] Figure 15 is a flowchart showing an operation procedure of a UE according to an embodiment of the disclosure;

[0037] Figure 16 is a block diagram showing an internal structure of a user equipment (UE) according to an embodiment of the disclosure; and

[0038] Figure 17 is a block diagram showing an internal structure of a base station according to an embodiment of the disclosure. DETAILED DESCRIPTION

[0039] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description, same drawing reference numerals are used for the same elements across various figures.

[0040] In describing embodiments, the description of techniques known to those of ordinary skill in the art and not directly related to the disclosure is omitted. This is to further clarify the gist of the disclosure without making it unclear.

[0041] For the same reason, some elements can be exaggerated or schematically shown. The size of each element does not necessarily fully reflect the actual size of the element. In all the drawings, the same reference numerals are always used to denote the same elements.

[0042] The advantages and features of the present disclosure and methods of accomplishing the same can be understood through the following embodiments described in detail with reference to the accompanying drawings. The scope of the present disclosure, however, is not limited to the embodiments disclosed herein but can be variously changed. The embodiments disclosed herein are provided only to inform those of ordinary skill in the art of the scope of the present disclosure. The present disclosure is limited only by the claims. Throughout the specification, like drawing reference numerals indicate like elements. When it is determined that a detailed description of known fields or functions will make the subject matter of the present disclosure unclear, a detailed description thereof will be skipped. The terms used herein are defined by considering the functions in the present disclosure, and the terms can be replaced with other terms according to the intention or practice of a user or operator. Therefore, the terms should be defined based on the overall disclosure.

[0043] Hereinafter, a base station (BS) can be an entity that allocates resources to a user equipment (UE) and can be at least one of a gNodeB, an eNodeB, a NodeB, a radio access unit, a base station controller, and a node on a network. The user equipment (UE) can include a mobile station (MS), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, a downlink (DL) refers to a wireless transmission path of a signal transmitted from a base station to a terminal, and an uplink (UL) refers to a wireless transmission path of a signal transmitted from a UE to a base station. Although the following is described by way of example with respect to an LTE, LTE-A, or 5G system, embodiments can also be applied to other communication systems having a similar technical background or channel pattern. For example, 5G mobile communication technology (or new radio, NR) developed after LTE-A can be included therein, and 5G hereinafter can be a concept including legacy LTE, LTE-A, and other similar services. In addition, embodiments can be modified within such a range that does not significantly depart from the scope of the present invention according to the judgment of one of ordinary skill in the art, and such modifications can be applicable to other communication systems.

[0044] It should be understood that the blocks in each flowchart, and combination of flowcharts, can be implemented by computer program instructions. Since the computer program instructions can be loaded into the processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, the instructions executed by the processor of the computer or other programmable data processing apparatus generate means for performing the functions described in connection with the blocks of each flowchart. Since the computer program instructions can be stored in a computer usable or computer readable memory that can direct the computer or other programmable data processing apparatus to function in a certain manner, the instructions stored in such computer usable or computer readable memory are capable of producing a product comprising an instruction means for performing the functions described in connection with the blocks of each flowchart. Since the computer program instructions can be loaded into the computer or other programmable data processing apparatus, the instructions on the computer or other programmable data processing apparatus generate a process executed by the computer as a series of operations and operate the computer or other programmable data processing apparatus can provide steps for performing the functions described in connection with the blocks in each flowchart.

[0045] Furthermore, each block can represent a module, a segment, or a portion of code, which includes one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementation examples, the functions mentioned in the blocks can occur out of order. For example, two blocks shown in succession can in fact be executed substantially concurrently or the activities associated with the blocks can be performed in the reverse order according to corresponding functions.

[0046] As used herein, the term "unit" refers to a software element or a hardware element such as a field-programmable gate array (FPGA) or an application-specific integrated circuit (ASIC). The unit performs a certain role. However, the term "unit" is not limited to mean a software or hardware element. The "unit" can be configured as a storage medium that can be addressed, or can be configured as a processor that reproduces one or more processors. Accordingly, the "unit" includes, for example, elements such as software elements, object-oriented software elements, class elements, and task elements, processes, functions, attributes, procedures, sub-routines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided in the elements or "units" can be combined with additional elements or can be split into sub-elements or sub-units. Furthermore, the elements and "units" can be implemented to reproduce one or more CPUs in a device or a secure multimedia card. Furthermore, in the present disclosure, "... unit" can include one or more processors.

[0047] Wireless communication systems have evolved beyond voice-centric services to provide high data rate and high quality packet data services such as 3rd Generation Partnership Project (3GPP) High Speed Packet Access (HSPA), Long Term Evolution (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), or Institute of Electrical and Electronics Engineers (IEEE) 802.16e communication standards.

[0048] As a representative example of such a broadband wireless communication system, an LTE system employs Orthogonal Frequency Division Multiplexing (OFDM) for a downlink and Single Carrier Frequency Division Multiple Access (SC-FDMA) for an uplink. The uplink refers to a wireless link through which a UE transmits data or control signals to a base station (BS), and the downlink refers to a wireless link through which a base station transmits data or control signals to a UE. Such a multiple access scheme can generally allocate and operate time-frequency resources carrying data or control information for each user without overlapping (i.e., maintaining orthogonality) so as to distinguish data or control information of each user.

[0049] A post-LTE communication system, such as a 5G communication system, needs to freely reflect various requirements of users and service providers, and thus supports services that simultaneously satisfy various requirements. Services considered for the 5G communication system include, for example, enhanced mobile broadband (eMBB), massive machine type communication (MMTC), and ultra-reliable low-latency communication (URLLC).

[0050] The eMBB aims to provide a further enhanced data transmission rate compared to LTE, LTE-A, or LTE-pro. For example, from the perspective of one base station, the eMBB for the 5G communication system needs to provide a peak data rate of 20 Gbps on a downlink and a peak data rate of 10 Gbps on an uplink. The 5G communication system needs to provide an increased user-perceived data rate while providing such a peak data rate. To meet such requirements, various transmission (TX) / reception (RX) techniques and multiple input multiple output (MIMO) need to be further enhanced. While LTE employs a TX bandwidth of up to 20 MHz in a 2 GHz frequency band to transmit a signal, the 5G communication system employs a wider frequency bandwidth in a 3 GHz to 6 GHz or greater than 6 GHz frequency band to meet the data rate required for the 5G communication system.

[0051] To support application services such as Internet of Things (IoT) in the 5G communication system, mMTC is also considered. To efficiently provide IoT, mMTC needs to support a large number of UEs in a cell, enhance coverage and battery time of a UE, and reduce UE cost. IoT devices are attached to various sensors or devices to provide communication functions, and thus, it needs to support a plurality of UEs (e.g., 1,000,000 UEs / km 2 ) in each cell. Since a UE supporting mMTC is likely to be located in a shadow area where a cell is not covered, such as an underground of a building, in terms of service nature, it can need a wider coverage compared to other services provided by the 5G communication system. A UE supporting mMTC can need to have a very long battery life, for example, 10 to 15 years, due to the need for low cost and difficulty in frequently replacing a battery.

[0052] URLLC is a mission-critical, cellular-based wireless communication service. For example, services for at least one of remote control of robots or machines, industrial automation, unmanned aerial vehicles, remote healthcare, or emergency alerts can be considered. This requires URLLC to provide very low latency and very high reliability communication. For example, a service supporting URLLC needs to satisfy an air interface latency of less than 0.5 milliseconds, while having a packet error rate of 7 5 or less. Therefore, for a service supporting URLLC, the 5G communication system can need to provide a shorter transmission time interval (TTI) compared to other services, while ensuring a reliable communication link by allocating a wide range of resources in a frequency band.

[0053] The three 5G services, eMBB, URLLC, and mMTC, can be multiplexed and transmitted in one system. In this case, services can employ different TX / RX schemes and TX / RX parameters to meet their different requirements. Of course, 5G is not limited to the above three services.

[0054] Hereinafter, a framework structure of a 5G system is described in more detail with reference to the accompanying drawings.

[0055] Figure 1 is a view showing a basic structure of a radio resource region in which a data or control channel is transmitted in a 5G wireless communication system.

[0056] Referring to Figure 1 , the horizontal axis represents one subframe 110 in a time domain, and the vertical axis represents one frequency band in a frequency domain. A basic unit of a resource in the time and frequency domains is a resource element (RE) 101, which can be defined by one orthogonal frequency-division multiplexing (OFDM) symbol 102 in the time domain and one subcarrier 103 in the frequency domain. In the frequency domain, (e.g., 12) consecutive REs can constitute one resource block (RB) 104.

[0057] Figure 2 is a view showing an example of a slot structure used in a 5G wireless communication system.

[0058] Figure 2 An exemplary structure including a frame 200, a subframe 201, and a slot 202 or 203 is shown. One frame 200 can be defined as 10 ms. One subframe 201 can be defined as 1 ms, and thus one frame 200 can consist of a total of 10 subframes 201. One slot 202 or 203 can be defined as 14 OFDM symbols (i.e., the number of symbols per slot One subframe 201 can consist of one or more slots 202 or 203, and the number of slots 202 or 203 per subframe 201 is determined depending on μ 204 or 205, which is a set value of a subcarrier spacing (SCS). In the illustrated example, a subcarrier spacing set value μ = 0 (204) and a subcarrier spacing set value μ = 1 (205). When μ = 0 (204), one subframe 201 can consist of one slot 202, and when μ = 1 (205), one subframe 201 can consist of two slots (203). In other words, the number of slots per subframe may vary depending on the set subcarrier spacing value μ, and accordingly, the number of slots per frame may also be different. According to each subcarrier spacing μ, and may be defined in Table 1 below.

[0059] [Table 1]

[0060]

[0061] <bwp>

[0062] Hereinafter, a configuration of a bandwidth part (BWP) in a 5G wireless communication system is described with reference to the accompanying drawings.

[0063] Figure 3 is a view illustrating an example of a configuration of a bandwidth part (BWP) in a 5G wireless communication system.

[0064] Figure 3 An example in which a UE bandwidth 300 is divided into two bandwidth parts, e.g., a bandwidth part #1 (BWP #1) 305 and a bandwidth part #2 (BWP #2) 310, is illustrated. The base station can configure one or more bandwidth parts in the UE, and for each bandwidth part, the following information can be configured.

[0065] [Table 2]

[0066]

[0067] Here, bwp-Id refers to a bandwidth part identifier, locationAndBandwidth indicates a location of the bandwidth part, subcarrierSpacing indicates a subcarrier spacing, and cyclicPrefix indicates a length of a cyclic prefix (CP).

[0068] The configuration of the bandwidth part is not limited thereto, and various BWP-related parameters other than the above-described configuration information can be configured in the UE. The base station can transmit the configuration information to the UE through higher layer signaling, e.g., radio resource control (RRC) signaling. At least one of the one or more configured bandwidth parts can be activated. Whether to activate the configured bandwidth part can be semi-statically transmitted from the base station to the UE through RRC signaling or dynamically transmitted through downlink control information (DCI).

[0069] Before a radio resource control (RRC) connection, a UE can be configured with an initial part-bandwidth (BWP) for initial access by a base station via a master information block (MIB). The UE can receive configuration information about a search space and a control resource set (CORESET) in which a physical downlink control channel (PDCCH) can be transmitted through the MIB in an initial access stage. Each of the control resource set and the search space configured with the MIB can be regarded as an identifier (ID) 0. The base station can provide at least one or more pieces of information for frequency allocation information, time allocation information, and numerology of the control resource set #0 to the UE through the MIB. Here, the numerology can include at least one of a subcarrier spacing and a cyclic prefix (CP). Here, the CP can refer to at least one of a length of the CP and information corresponding to the length of the CP (e.g., a normal CP length or an extended CP length). In addition, the base station can provide configuration information for a monitoring period and occasion of the control resource set #0, i.e., configuration information for the search space #0, to the UE via the MIB. The UE can regard a set of frequency ranges of the control resource set #0 obtained from the MIB as an initial BWP for initial access. In this case, an identifier (ID) of the initial BWP can be regarded as 0.

[0070] The above-described configuration of the part-bandwidth supported by the 5G communication system can be used for various purposes.

[0071] The configuration of the part-bandwidth can be used when the bandwidth supported by the UE is smaller than the system bandwidth. For example, the base station can configure a frequency domain location of the part-bandwidth in the UE (e.g., through configuration information of a higher layer) to allow the UE to transmit / receive data in a specific frequency location in the system bandwidth.

[0072] For the purpose of supporting different numerologies, the base station can configure multiple part-bandwidths for the UE. For example, to support data transmission / reception of some UEs using a subcarrier spacing of 15 kHz and a subcarrier spacing of 30 kHz, the base station can configure two bandwidths, such as a subcarrier spacing of 15 kHz and a subcarrier spacing of 30 kHz, for the UE. The different part-bandwidths can be frequency division multiplexed, and when the base station transmits / receives data with a specific subcarrier spacing, the part-bandwidth set to the specific subcarrier spacing can be activated.

[0073] For the purpose of reducing power consumption of the UE, the base station can configure the UE with partial bandwidths having different sizes of bandwidth. For example, while the UE can support a very large bandwidth, such as a 100 MHz bandwidth, it can be very power consuming to always use the entire bandwidth to transmit / receive data. Specifically, unnecessary monitoring of the downlink control channel using the large bandwidth of 100 MHz in the absence of traffic is very inefficient in terms of power consumption. For the purpose of reducing power consumption of the UE, the base station can configure the UE with a partial bandwidth of a relatively small bandwidth, such as a 20 MHz partial bandwidth, in the UE. In the absence of traffic, the UE can monitor in the 20 MHz bandwidth, and if data occurs, the UE can transmit / receive data in the 100 MHz bandwidth according to an indication from the base station.

[0074] As described above, the UE before RRC connection can receive configuration information for an initial partial bandwidth via MIB in an initial access phase. The UE can be configured for a control resource set (CORESET) of a downlink control channel (PDCCH) from MIB of a physical broadcast channel (PBCH). The bandwidth of the control resource set configured through the MIB can be considered as the initial partial bandwidth, and the UE can receive a physical downlink shared channel (PDSCH) in which a SIB is transmitted via the configured initial partial bandwidth. The UE can detect a PDCCH on a search space and a control resource set in the initial partial bandwidth configured through the MIB, receive a remaining system information (RMSI) or a system information block (SIB) 1 required for initial access through a PDSCH scheduled by the PDCCH, and acquire configuration information about an uplink initial partial bandwidth through the SIB 1 (or RMSI). The initial BWP can be used for other system information (OSI), paging, and random access and for receiving a SIB.

[0075] If the UE is configured with one or more BWPs, the base station can indicate a change of the BWP to the UE using a BWP indicator in DCI. As an example, when the current activated partial bandwidth of the UE is partial bandwidth #1 305 in Figure 3 , the base station can indicate partial bandwidth #2 310 to the UE with a partial bandwidth indicator in DCI, and the UE can change the partial bandwidth to partial bandwidth #2 310 indicated using the partial bandwidth indicator in the DCI.

[0076] As described above, the DCI-based partial bandwidth change can be indicated by the DCI scheduling a PDSCH or a physical uplink shared channel (PUSCH). When the UE receives a request for changing the partial bandwidth in the DCI, the UE should be able to receive or transmit the PDSCH or the PUSCH scheduled by the DCI without any problem in the changed partial bandwidth. To this end, the standard specifies a requirement for a delay time TBWP required when changing the partial bandwidth, which can be defined as shown in Table 3 below.

[0077] [Table 3]

[0078]

[0079] The requirement for the delay for the partial bandwidth change can support Type 1 or Type 2 according to the capability of the UE. The UE can report the supportable partial bandwidth delay time type to the base station.

[0080] According to the above-described requirement for the partial bandwidth change delay time, if the UE receives the DCI including the partial bandwidth change indicator in slot n, the UE can complete the change to the new partial bandwidth indicated by the partial bandwidth change indicator at no later than slot n + T BWP , and can transmit / receive on the data channel scheduled by the DCI in the changed new partial bandwidth. When scheduling the data channel in the new partial bandwidth, the base station can consider the partial bandwidth change delay time T BWP of the UE to determine the time domain resource allocation for the data channel. In other words, when scheduling the data channel with the new partial bandwidth, in the method for determining the time domain resource allocation of the data channel, the base station can schedule the corresponding data channel after the partial bandwidth change delay time. Therefore, the UE can not expect the DCI indicating the partial bandwidth change to indicate a slot offset (K0 or K2) less than the partial bandwidth change delay time T BWP .

[0081] If the UE has received the DCI (e.g., DCI format 1_1 or 0_1) indicating the partial bandwidth change, the UE can not perform any transmission or reception in a time period from the third symbol of the slot in which the PDCCH including the DCI has been received to the starting symbol of the slot indicated by the slot offset (K0 or K2) value (indicated by the time domain resource allocation field in the DCI). For example, if the UE receives the DCI indicating the partial bandwidth change in slot n and the slot offset value indicated by the DCI is K, the UE can not perform any transmission or reception from the third symbol of slot n to the symbol before the last symbol of slot n + K (i.e., slot n + K - 1).

[0082] <ss pbch>

[0083] Next, a synchronization signal (SS) / PBCH block in a 5G wireless communication system is described.

[0084] The SS / PBCH block can mean a physical layer channel block consisting of a primary SS (PSS), a secondary SS (SSS), and a PBCH described below.

[0085] PSS: a signal used as a reference for downlink time / frequency synchronization and providing partial information of a cell ID.

[0086] SSS: a signal used as a reference for downlink time / frequency synchronization and providing the remaining information of a cell ID which the PSS does not provide. In addition, it can also be used as a reference signal (RS) for PBCH demodulation.

[0087] PBCH: providing essential system information necessary for a UE to transmit and receive a data channel and a control channel. The essential system information can include at least one of search space related control information indicating radio resource mapping information for a control channel or scheduling control information for a separate data channel for transmitting system information.

[0088] SS / PBCH block: The SS / PBCH block consists of a combination of PSS, SSS, and PBCH. One or more SS / PBCH blocks can be transmitted within 5 ms, and each transmitted SS / PBCH block can be distinguished by an index.

[0089] The UE can detect the PSS and the SSS in an initial access phase and can decode the PBCH. The UE can obtain an MIB from the PBCH and can be configured a control resource set (CORESET) #0 (which can correspond to a control resource set having a control resource set index of 0) from it. The UE can perform monitoring on the control resource set #0 assuming that a selected SS / PBCH block and a demodulation reference signal (DMRS) transmitted in the control resource set #0 are quasi co-located (QCL). The UE can receive system information using downlink control information transmitted in the control resource set #0. The UE can obtain configuration information related to a random access channel (RACH) required for initial access from the received system information. The UE can consider a selected SS / PBCH index to transmit a physical RACH (PRACH) to a base station, and the base station receiving the PRACH can obtain the SS / PBCH block index selected by the UE. The base station can know which block the UE has selected from the SS / PBCH block and monitor the control resource set #0 related thereto.

[0090] <dci>

[0091] Next, Downlink Control Information (DCI) in a 5G wireless communication system is described.

[0092] In a 5G system, scheduling information for uplink data (or PUSCH) or downlink data (or PDSCH) is transmitted from a base station to a UE through DCI. For a PUSCH or a PDSCH, the UE can attempt to monitor or detect at least one of a DCI format for fallback and a DCI format for non-fallback. The fallback DCI format can include fields predetermined between the base station and the UE, and the non-fallback DCI format can include configurable fields.

[0093] The DCI can be transmitted via channel coding and modulation through a Physical Downlink Control Channel (PDCCH). A Cyclic Redundancy Check (CRC) is added to a payload of the DCI, and the CRC is scrambled using a Radio Network Temporary Identifier (RNTI) that is an identifier of the UE. Different RNTIs are used according to purposes of the DCI (e.g., at least one of UE-specific data transmission, power control commands, and random access response). In other words, the RNTI is not explicitly transmitted, but the RNTI is included in a CRC calculation process and transmitted. Upon receiving the DCI transmitted on the PDCCH, the UE can check the CRC using an allocated RNTI, and when a result of the CRC check is successful, the UE can know that the DCI has been transmitted to the UE.

[0094] For example, DCI scheduling a PDSCH for system information (SI) can be scrambled by an SI-RNTI. DCI scheduling a PDSCH for a random access response (RAR) message can be scrambled by an RA-RNTI. DCI scheduling a PDSCH for a paging message can be scrambled by a P-RNTI. DCI providing a slot format indicator (SFI) can be scrambled by an SFI-RNTI. DCI providing transmission power control (TPC) can be scrambled by a TPC-RNTI. DCI scheduling a UE-specific PDSCH or PUSCH can be scrambled using any one of a cell RNTI (C-RNTI), a Modulation Coding Scheme C-RNTI (MCS-C-RNTI), and a configured scheduling RNTI (CS-RNTI).

[0095] DCI format 0_0 can be used as fallback DCI for scheduling a PUSCH, and in this case, the CRC can be scrambled by a C-RNTI. The DCI format 0_0 in which the CRC is scrambled by the C-RNTI can include fields as shown in Table 4, for example.

[0096] [Table 4]

[0097]

[0098] The DCI format 1_0 can be used as non-fallback DCI for scheduling PUSCH, and in this case, the CRC can be scrambled by C-RNTI. The DCI format 0_1 in which the CRC is scrambled by the C-RNTI can include, for example, the information shown in Table 5 below.

[0099] [Table 5]

[0100]

[0101]

[0102]

[0103]

[0104]

[0105] The DCI format 0_0 can be used as fallback DCI for scheduling PUSCH, and in this case, the CRC can be scrambled by C-RNTI. The DCI format 1_0 in which the CRC is scrambled by the C-RNTI can include, for example, the information shown in Table 6 below.

[0106] [Table 6]

[0107]

[0108] The DCI format 1_1 can be used as non-fallback DCI for scheduling PDSCH, and in this case, the CRC can be scrambled by C-RNTI. The DCI format 1_1 in which the CRC is scrambled by the C-RNTI can include, for example, the information shown in Table 7 below.

[0109] [Table 7]

[0110]

[0111]

[0112]

[0113] <Time domain resource allocation>

[0114] Hereinafter, a method for allocating a time domain resource for a data channel in a 5G wireless communication system is described.

[0115] A base station can configure a table of time domain resource allocation information for a downlink data channel (PDSCH) and an uplink data channel (PUSCH) for a UE via higher layer signaling (e.g., RRC signaling).

[0116] For PDSCH, a table including up to maxNrofDL-Allocations = 16 entries can be configured, and for PUSCH, a table including up to maxNrofUL-Allocations = 16 entries can be configured. The time domain resource allocation information can include, for example, at least one of PDCCH-to-PDSCH slot timing (which is designated as K0 and corresponds to a time interval between a reception time of a PDCCH and a transmission time of a PDSCH scheduled by the received PDCCH), or PDCCH-to-PUSCH slot timing (which is designated as K2 and corresponds to a time interval between a time of a PDCCH and a transmission time of a PUSCH scheduled by the received PDCCH), information of a position and a length of a starting symbol of the PDSCH or the PUSCH scheduled in a slot, and a mapping type of the PDSCH or the PUSCH. For example, the information shown in Table 8 and Table 9 below can be provided from the base station to the UE.

[0117] [Table 8]

[0118]

[0119] Here, K0 indicates PDCCH-to-PDSCH timing in a slot unit, mappingType (mapping type) indicates a PDSCH mapping type, and startSymbolAndLength (starting symbol and length) indicates a starting symbol and a length of the PDSCH.

[0120] [Table 9]

[0121]

[0122] Here, K2 indicates PDCCH-to-PUSCH timing in a slot unit, mappingType (mapping type) indicates a PUSCH mapping type, and startSymbolAndLength (starting symbol and length) indicates a starting symbol and a length of the PUSCH.

[0123] The base station can provide one of the entries in the table of time domain resource allocation information to the UE via layer 1 (L1) signaling (e.g., DCI) (e.g., which can be indicated with a "time domain resource allocation" field in the DCI). The UE can acquire the time domain resource allocation information for the PDSCH or the PUSCH based on the DCI received from the base station.

[0124] <Frequency Domain Resource Allocation>

[0125] The following describes a method for allocating frequency domain resources for data channels in a 5G wireless communication system.

[0126] 5G wireless communication systems support two types of methods for indicating frequency domain resource allocation information for the Physical Downlink Shared Channel (PDSCH) and Physical Uplink Shared Channel (PUSCH): resource allocation type 0 and resource support allocation type 1.

[0127] Resource allocation type 0

[0128] RB allocation information can be provided to the UE from the base station in the form of a bitmap of resource block groups (RBGs). In this case, an RBG can consist of a set of consecutive virtual RBs, and the size P of the RBG can be determined based on the value set to the higher-layer parameter (rbg-Size) and the portion of the bandwidth size defined in Table 10 below.

[0129] [Table 10]

[0130] Nominal RBG large and small households

[0131] Partial bandwidth size Configuration 1 Configuration 2 1-36 2 4 37-72 4 8 73-144 8 16 145-275 16 16

[0132] Here, a portion of bandwidth i contains The total number of RBGs of size (NRBG) is Here, the size of the first RBG is if Size of the last RBG for otherwise Let P be the size of RBG excluding RBG.

[0133] ■ in

[0134] ◆The size of the first RBG is

[0135] ◆If The final size of RBG is Otherwise, it is P.

[0136] ◆The size of all other RBGs is P.

[0137] Having N RBG Each bit in a bitmap of bit size can correspond to its corresponding RBG. RBGs can be indexed in ascending order of frequency, starting from the position of the lowest bit in a portion of the bandwidth. For N bits in a portion of the bandwidth... RBG RBGs can be RBG#0 to RBG#(N) RBG -1) Mapping to the most significant bit (MSB) to the least significant bit (LSB) of the RBG bitmap. When a particular bit value in the bitmap is 1, the UE can determine that the RBG corresponding to the bit value has been allocated, and when a particular bit value in the bitmap is 0, the UE can determine that the RBG corresponding to the bit value has not been allocated.

[0138] Resource allocation type 1

[0139] RB allocation information can be provided to the UE from the base station as information for the starting position and length of the continuously allocated VRB. In this case, interleaving or non-interleaving can be further applied to the continuously allocated VRB. The resource allocation field of the resource allocation field type 1 can be configured with a resource indication value (RIV), and the RIV can consist of a starting position (RBstart) of the VRB and a length (Lcont) of the continuously allocated RB. start RB In one embodiment, The RIV in the partial bandwidth of the size can be defined as follows.

[0140] ■If then

[0141] ◆

[0142] ■Else

[0143] ◆

[0144] ■where L RBs ≥ 1 and should not exceed

[0145] ​A base station can configure a resource allocation type for a UE through higher layer signaling (e.g., a higher layer parameter resourceAllocation can be set to one of resourceAllocationType0, resourceAllocationType1, or dynamicSwitch). If the UE has been configured with both resource allocation type 0 and 1 (or if the higher layer parameter resourceAllocation is set to dynamicSwitch in the same way), it can indicate whether the bit corresponding to the most significant bit (MSB) of the field indicating resource allocation in the DCI format indicating scheduling is resource allocation type 0 or resource allocation type 1. In addition, resource allocation information can be indicated through the remaining bits other than the bit corresponding to the MSB based on the indicated resource allocation type, and the UE can interpret the resource allocation field information of the DCI field accordingly. If the UE is configured with resource allocation type 0 or resource allocation type 1 (or if the higher layer parameter resourceAllocation is set to resourceAllocationType0 or resourceAllocationType1 in the same way), resource allocation information can be indicated based on the resource allocation type, where the resource allocation type is configured by the field indicating resource allocation in the DCI format indicating scheduling, and the UE can interpret the resource allocation field information for the DCI field accordingly.

[0146] <mcs>

[0147] Modulation and coding schemes used in 5G wireless communication systems are described below.

[0148] In 5G, multiple MCS index tables are defined for PDSCH and PUSCH scheduling. Which MCS table is assumed in multiple MCS tables can be set or indicated by higher layer signaling from base station to UE or L1 signaling or by RNTI assumed by UE at PDCCH decoding.

[0149] The MCS index table for PDSCH and CP-OFDM based PUSCH (or PUSCH without transform precoding) can be shown in Table 11 below.

[0150] [Table 11]

[0151] Table 5.1.3.1-1: MCS index table 1 for PDSCH

[0152]

[0153] The MCS index table for PDSCH and CP-OFDM based PUSCH (or PUSCH without transform precoding) can be shown in Table 12.

[0154] [Table 12]

[0155] Table 5.1.3.1-2: MCS index table 2 for PDSCH

[0156]

[0157] The MCS index table for PDSCH and CP-OFDM based PUSCH (or PUSCH without transform precoding) can be shown in Table 13.

[0158] [Table 13]

[0159] Table 5.1.3.1-3: MCS index table 3 for PDSCH

[0160]

[0161] The MCS index table 1 for DFT-s-OFDM based PUSCH (or PUSCH with transform precoding) can be shown in Table 14.

[0162] [Table 14]

[0163] Table 6.1.4.1-1: MCS index table for PUSCH with transform precoding and 64QAM

[0164]

[0165] The MCS index table 2 for DFT-s-OFDM based PUSCH (or PUSCH with transform precoding) can be as shown in Table 15.

[0166] [Table 15]

[0167] Table 6.1.4.1-2: MCS index table 2 for PUSCH with transform precoding and 64QAM

[0168]

[0169] The MCS index table for PUSCH with transform precoding or Discrete Fourier Transform (DFT) precoding and 64QAM can be as shown in Table 16.

[0170] [Table 16]

[0171]

[0172] The MCS index table for PUSCH with transform precoding or DFT precoding and 64QAM can be as shown in Table 17.

[0173] [Table 17]

[0174]

[0175] <pdcch>

[0176] A downlink control channel in a 5G wireless communication system is described below with reference to the accompanying drawings.

[0177] Figure 4 is a view illustrating an example of a control resource set (CORESET) in which a downlink control channel is transmitted in a wireless communication system.

[0178] Reference Figure 4 A UE partial bandwidth 410 is configured in a frequency domain, and two control resource sets, i.e., a control resource set #1 401 and a control resource set #2 402, are configured in one slot 420 in a time domain. The control resource sets 401 and 402 can be configured to specific frequency resources 403 in the entire UE partial bandwidth 410 in the frequency domain. In addition, the control resource sets 401 and 402 can be configured with one or more OFDM symbols in the time domain, and the number of OFDM symbols can be defined as a control resource set length (CORESET duration) 404. In the illustrated example, the control resource set #1 401 can be configured as a control resource set length of two symbols, and the control resource set #2 402 can be configured as a control resource set length of one symbol.

[0179] Each of the above-described control resource sets can be configured to a UE by a base station through higher layer signaling, e.g., at least one of system information, MIB, or RRC signaling. Configuring a control resource set for a UE refers to providing at least one piece of information among a control resource set identification, a control resource set frequency location, and a control resource set symbol length. For example, a higher layer signaling information element for configuring a control resource set can include information as shown in Table 18.

[0180] [Table 18]

[0181]

[0182] Here, tci-StatesPDCCH is configuration information about a transmission configuration indication (TCI) state and can include one or more synchronization signal (SS) / physical broadcast channel (PBCH) block indices or channel state information reference signal (CSI-RS) indices having a quasi co-location (QCL) relationship with a DMRS transmitted in a corresponding control resource set.

[0183] Figure 5 is a view illustrating an example of a basic unit constituting a time-frequency resource of an available downlink control channel in a wireless communication system.

[0184] Reference Figure 5 , the basic unit of time-frequency resources constituting a downlink control channel can be referred to as a resource element group (REG) 503, and the REG 503 can be defined to have one OFDM symbol 501 on the time axis and one physical resource block (PRB) 502 (i.e., 12 subcarriers) on the frequency axis. The base station can configure a downlink control channel allocation unit by concatenating at least one REG 503.

[0185] When the basic unit in which a downlink control channel is allocated is a control channel element (CCE) 504, one CCE 504 can be composed of a plurality of REGs 503. In the example of the REG 503 shown, the REG 503 can be composed of 12 REs, and if one CCE 504 is composed of six REGs 503, one CCE 504 can be composed of 72 REs. The region in which the downlink control resource set is configured can be composed of a plurality of CCEs 504, and a specific downlink control channel can be mapped to one or more CCEs 504 and transmitted according to an aggregation level (AL) in the control resource set. The CCEs 504 in the control resource set are distinguished by numbers, and in this case, the numbers of the CCEs 504 can be allocated according to a logical mapping scheme.

[0186] The basic unit of the downlink control channel, i.e., the REG 503, can include a region of REs to which the DCI is mapped and a region to which the DMRS 505 for demodulating the DCI is mapped. At least one (three in the example shown) DMRS 505 can be transmitted in one REG 503. According to the aggregation level (AL), the number of CCEs required to transmit a PDCCH can be 1, 2, 4, 8, 16, and different numbers of CCEs can be used to implement link adaptation of the downlink control channel. For example, if AL=L, one downlink control channel can be transmitted via L CCEs.

[0187] The UE needs to detect a signal in the control resource set without knowing the information of the downlink control channel, and for such blind decoding, a search space indicating a group of CCEs is defined. The search space is a group of candidate control channels composed of CCEs that the UE needs to try to decode on a given aggregation level, and since there are several aggregation levels to bundle 1, 2, 4, 8, or 16 CCEs, the UE has multiple search spaces. A search space set (Set) can be defined as a group of search spaces under all set aggregation levels.

[0188] <Search Space>

[0189] The search space for PDCCH can be classified into common search space or UE-specific search space. A predetermined group of UEs or all UEs can search the common search space to receive cell common control information, such as a paging message or dynamic scheduling for system information. For example, PDSCH scheduling allocation information for transmitting SIB (including cell service provider) can be detected by checking the common search space. The common search space can be defined as a set of pre-agreed CCEs that allow a predetermined group of UEs or all UEs to receive PDCCH. Scheduling allocation information for UE-specific PDSCH or PUSCH can be received by checking the UE-specific search space. The UE-specific search space can be specifically defined for the UE by a function of various system parameters and UE identity.

[0190] In the 5G wireless communication system, parameters for the search space of PDCCH can be configured by the base station to the UE through higher layer signaling (e.g., SIB, MIB, or RRC signaling). For example, the base station can configure the UE with, for example, the number of PDCCH candidates per aggregation level L, the monitoring period of the search space, the monitoring occasion of the symbol unit within the slot of the search space, the search space type (common search space or UE-specific search space), the combination of RNTI and DCI format to be monitored in the search space, or the control resource set index to be monitored in the search space. For example, the higher layer signaling information element for configuring the search space of PDCCH can include the parameters as shown in Table 19.

[0191] [Table 19]

[0192]

[0193] According to the configuration information, the base station can configure one or more search space sets for the UE. The base station can configure the UE with search space set 1 and search space set 2, and configure it to monitor DCI format A scrambled with X-RNTI in the search space set 1 in the common search space, and monitor DCI format B scrambled with Y-RNTI in the search space set 2 in the UE-specific search space.

[0194] According to the above-described configuration information, there can be one or more search space sets in the common search space or the UE-specific search space. For example, search space set #1 and search space set #2 can be configured as the common search space, and search space set #3 and search space set #4 can be configured as the UE-specific search space.

[0195] In the common search space, the following combinations of DCI format and RNTI can be monitored, for example. Of course, it is not limited to the examples described below.

[0196] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, MCS-C-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

[0197] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0198] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0199] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0200] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0201] In the UE-specific search space, the following combinations of DCI format and RNTI can be monitored, for example. Of course, the examples described below are not limited.

[0202] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0203] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0204] RNTIs can be defined and used as follows.

[0205] * C-RNTI (Cell RNTI): used for scheduling UE-specific PDSCH

[0206] * Modulation and Coding Scheme C-RNTI (MCS-C-RNTI): used for scheduling UE-specific PDSCH

[0207] * Temporary Cell RNTI (TC-RNTI): used for scheduling UE-specific PDSCH

[0208] * Configured Scheduling RNTI (CS-RNTI): used for scheduling semi-statically configured UE-specific PDSCH

[0209] * Random Access RNTI (RA-RNTI): used for scheduling PDSCH in the random access stage

[0210] * Paging RNTI (P-RNTI): used for scheduling PDSCH in which a paging is transmitted

[0211] * System information RNTI (SI-RNTI): used for scheduling PDSCH in which system information is transmitted

[0212] * Interruption RNTI (INT-RNTI): used for indicating whether to puncture PDSCH

[0213] * Transmit power control of PUSCH RNTI (TPC-PUSCH-RNTI): used for indicating power control command of PUSCH

[0214] * Transmit power control of PUCCH RNTI (TPC-PUCCH-RNTI): used for indicating power control command of PUCCH

[0215] * Transmit power control of SRS RNTI (TPC-SRS-RNTI): used for indicating power control command of SRS

[0216] The above DCI format can follow the definition in Table 20 below.

[0217] [Table 20]

[0218]

[0219] In the 5G wireless communication system, the search space of the aggregation level L in the control resource set p and the search space set s can be represented by the following Equation 1.

[0220] [Equation 1]

[0221]

[0222] L: aggregation level

[0223] n CI : carrier index

[0224] N CCE,p : total number of CCEs present in the control resource set p

[0225] n μ s,f : slot index

[0226] M (L) p,s,max : number of PDCCH candidates of aggregation level L

[0227] m snCI = 0, …, M (L) p,s,max -1: PDCCH candidate index of aggregation level L

[0228] i = 0, …, L-1

[0229] -

[0230] Y p,-1 = n RNTI ≠ 0, A0= 39827, A1= 39829, A2= 39839, D= 65537

[0231] -n RNTI : UE identifier

[0232] In case of common search space, Y_(p,n μ s,f ) can be 0.

[0233] In case of UE-specific search space, Y_(p,n μ s,f ) can have a value changed according to an identity (C-RNTI or an ID configured in the UE by a base station) of the UE and a time index.

[0234] Figure 6 is a view showing an example of uplink-downlink configuration in a wireless communication system.

[0235] Referring to Figure 6 , a slot 601 can include 14 symbols 602. In a 5G communication system, an uplink-downlink configuration of a symbol / slot can be configured in three stages.

[0236] First, an uplink-downlink configuration 610 of a symbol / slot can be indicated semi-statically in a symbol unit by cell-specific configuration information via system information. In one embodiment, cell-specific uplink-downlink configuration information can include uplink-downlink pattern information and reference subcarrier spacing information. The uplink-downlink pattern information can include a period 603 in which one DL-UL pattern is applied, a number 611 of consecutive full DL slots at the beginning of each DL-UL pattern, a number 612 of consecutive DL symbols at the beginning of a slot after the last full DL slot, a number 613 of consecutive full UL slots at the end of each DL-UL pattern, or a number 614 of consecutive UL symbols at the end of a slot before the first full UL slot. In this case, a slot and a symbol for which uplink or downlink is not indicated can be determined as a flexible slot / symbol.

[0237] Second, the UE-specific uplink-downlink configuration 620 for flexible time slots or time slots 621 and 622 including flexible symbols can be semi-statically indicated by UE-specific configuration information via dedicated higher layer signaling. Each time slot / symbol can be configured as uplink or downlink by the number of consecutive downlink symbols 623 or 625 from the starting symbol number of the time slot 621 or 622 and the number of consecutive uplink symbols 624 or 626 from the end number of the time slot, or the entire time slot can be configured as downlink or uplink.

[0238] Finally, the uplink-downlink configuration 630 for each UE group for symbols not indicated as downlink or uplink by system information and UE-specific configuration information can be dynamically configured as downlink or uplink by a slot format indicator (SFI) 631 or 632 included in a downlink control channel. The slot format indicator 631 or 632 can indicate one index selected from a pre-configured table showing uplink-downlink configurations for 14 symbols in one time slot. The table can be shown, for example, as Table 21 below.

[0239] [Table 21]

[0240]

[0241] Compared to LTE communication services, 5G wireless communication services employ additional coverage extension techniques, but the actual coverage of 5G wireless communication services can use time division duplex (TDD) technology suitable for services that generally focus more on downlink traffic. In addition, as the center frequency increases to expand the frequency band, the coverage of the base station and the UE decreases. Therefore, coverage enhancement is a key requirement for 5G wireless communication services. In particular, overall, the UE transmission power is lower than the base station transmission power, and in the time domain, the downlink occupies a larger proportion than the uplink to support services that focus more on downlink traffic, so the coverage enhancement of the uplink channel is a core requirement for 5G wireless communication services.

[0242] The uplink channel coverage of the base station and the UE can be physically enhanced by increasing the time resources of the uplink channel, reducing the center frequency, or increasing the UE transmission power. However, due to the limitation of the frequency band predetermined for each network operator, increasing the time resources and changing the frequency can be limited. Since the maximum transmission power is fixed by the standard to reduce interference, increasing the UE transmission power can be limited.

[0243] Therefore, in order to enhance the coverage of the base station and the UE, the uplink resources and the downlink resources can be divided in the time domain according to the uplink-downlink traffic ratio as in a TDD system, or divided in the frequency domain as in an FDD system. In the present disclosure, a system in which the uplink resources and the downlink resources can be flexibly divided in the time domain and / or the frequency domain can be referred to as an XDD system, a flexible TDD system, a hybrid TDD system, a TDD-FDD system, a hybrid TDD-FDD system, a sub-band full duplex system, or a dynamic TDD system, and for the convenience of description, hereinafter is referred to as an XDD system. In the XDD, "X" can mean time and / or frequency.

[0244] Figure 7a and Figure 7b is a view showing an uplink-downlink configuration in an XDD system in which uplink and downlink resources are flexibly divided in the time domain and the frequency domain according to an embodiment of the present disclosure.

[0245] Referring to Figure 7a , the uplink-downlink configuration 700 of the base station can be configured such that each symbol or slot 702 is flexibly allocated to the uplink or the downlink according to the uplink and downlink traffic ratio of the entire frequency band 701. In the frequency domain, a guard band 704 can be allocated between the downlink resources 703 and the uplink resources 705. The guard band 704 can be allocated to reduce interference of out-of-band emission generated when the base station transmits a downlink channel or signal in the downlink resources 703 to an uplink channel or signal.

[0246] Referring to Figure 7b , the UE1 710 and the UE2 720, which have more traffic on the downlink than on the uplink, can be allocated downlink and uplink resources in a ratio of 4:1 in the time domain through the configuration of the base station. The UE3 730, which operates at the cell edge and has insufficient uplink coverage, can be allocated only uplink resources for a certain time range through the configuration of the base station. In the same time range, the UE4 740, which operates at the cell edge and thus has insufficient uplink coverage but has relatively more downlink and uplink traffic, can be allocated more uplink resources in the time domain for uplink coverage and more downlink resources in the frequency domain. As in the above example, for the UE that operates relatively at the cell center, more downlink resources can be allocated in the time domain, and for the UE that operates relatively at the cell edge and has insufficient uplink coverage, more uplink resources can be allocated in the time domain.

[0247] Figure 8 is a view illustrating an example of an uplink-downlink configuration in a full-duplex communication system flexibly dividing uplink and downlink resources in a time domain and a frequency domain according to an embodiment of the disclosure.

[0248] Referring to Figure 8 , the downlink resources 800 and the uplink resources 801 can be fully or partially overlapped with each other in a time domain and / or a frequency domain. The downlink resources 800 and the uplink resources 801 allocated to the UE in time resources corresponding to the symbols or slots 802 and frequency resources corresponding to the bandwidth 803 can be configured to be fully or partially overlapped with each other. In the illustrated example, the PDSCH 810 allocated to the UE in the first symbol / slot fully overlaps with the PUSCH 811 in the time domain and the frequency domain. The PDSCH 820 allocated to the UE in the second symbol / slot partially overlaps with the PUSCH 821 in the time domain and fully overlaps with the PUSCH 821 in the frequency domain. The PDSCH 830 allocated to the UE in the third symbol / slot does not overlap or is adjacent to the PUSCH 831 in the time domain and partially overlaps with the PUSCH 831 in the frequency domain.

[0249] Downlink transmission from the base station to the UE can be made in the areas 810, 820, 830 configured as the downlink resources 800, and uplink transmission from the UE to the base station can be made in the areas 811, 821, 831 configured as the uplink resources 801. In this case, when the downlink resources 800 and the uplink resources 801 are at least partially overlapped with each other in the time domain and the frequency domain, downlink and uplink transmission / reception of the base station or the UE in the same time-frequency resources can occur simultaneously (e.g., during at least one same OFDM symbol).

[0250] Figure 9 is a view illustrating a structure of a transceiver supporting a full-duplex scheme according to an embodiment of the disclosure. Figure 9 The structure of the illustrated transceiver can be applied to a base station device or a UE device and includes a transmission end (TX path) and a reception end (RX path) to be described below.

[0251] Referring to Figure 9 , the TX end can include a TX baseband processing block 910, a digital pre-distortion (DPD) block 911, a digital-to-analog converter (DAC) 912, a pre-driver 913, a power amplifier (PA) 914, and a TX antenna 915. Each block can function as follows.

[0252] The TX baseband processing block 910 can perform digital processing on a TX signal.

[0253] The digital pre-distortion block 911 can perform pre-distortion on a digital TX signal.

[0254] The DAC 912 can convert a digital signal to an analog signal.

[0255] The pre-driver 913 can perform gradual power amplification on the analog TX signal.

[0256] The power amplifier 914 can perform power amplification on the analog TX signal.

[0257] The TX antenna 915 can transmit the power-amplified signal 901.

[0258] Referring to FIG. 9, Figure 9 The RX end can include an RX antenna 924, a low noise amplifier (LNA) 923, an analog-to-digital converter (ADC) 922, a serial interference cancellation (SIC) block 921, and an RX baseband processing block 920. Each block can function as follows.

[0259] The RX antenna 924 can receive the RF band signal 902.

[0260] The low noise amplifier 923 can amplify the power of the analog RX signal while minimizing noise amplification.

[0261] The ADC 922 can convert the analog signal to a digital signal.

[0262] The SIC block 921 can perform interference cancellation on the digital signal.

[0263] The RX baseband processing block 920 can perform digital processing on the interference-canceled signal.

[0264] There can be a power amplifier (PA) coupler 916 and a coefficient update block 917 for additional signal processing between the TX end and the RX end. Each block can function as follows.

[0265] The PA coupler 916 can detect the waveform of the analog TX signal that has passed through the power amplifier 914 so as to be observed at the RX end. The detected signal can be input to the ADC 922 through a switch 916a.

[0266] The coefficient update block 917 can update various coefficients required for digital signal processing at the TX end and the RX end. The calculated coefficients can be used to configure parameters required at the DPD 911 of the TX end and the SIC 921 of the RX end.

[0267] When transmitting and receiving operations are simultaneously performed in a base station or a UE device, Figure 9 The illustrated transceiver structure can be used to effectively control interference between TX signals and RX signals. For example, when transmission and reception are simultaneously performed in a transceiver, a TX signal 901 transmitted through a TX antenna 915 of a TX side can be received through an RX antenna 924 of an RX side, in which case the TX signal 901 received by the RX side can cause interference 900 to an RX signal 902 that the RX side is originally supposed to receive. The interference 900 between the TX signal 901 and the RX signal 902 is referred to as self-interference.

[0268] When a base station simultaneously performs downlink transmission and uplink reception, a downlink signal transmitted by a TX side of the base station can be received by an RX side of the base station, such that interference (i.e., self-interference) can occur between the downlink signal transmitted from the base station and an uplink signal that is originally supposed to be received at the RX side of the base station. Similarly, when a UE simultaneously performs downlink reception and uplink transmission, an uplink signal transmitted from a TX side of the UE can be received by an RX side of the UE, such that interference (i.e., self-interference) can occur between the uplink signal transmitted from the UE and a downlink signal that is originally supposed to be received at the RX side of the UE. Thus, interference between links in different directions, i.e., downlink signals and uplink signals, in a base station and a UE can be referred to as cross-link interference.

[0269] Self-interference between a TX signal (or downlink / uplink signal) and an RX signal (or uplink / downlink signal) can occur in a system that simultaneously performs transmission and reception. As an example, self-interference can occur in the above-described XDD system.

[0270] Figure 10 is a view illustrating an example of self-interference between uplink frequency resources and downlink frequency resources in an XDD system according to an embodiment of the disclosure.

[0271] Reference Figure 10 In the case of an XDD system, downlink resources 1000 and uplink resources 1001 are divided in a frequency domain, and in this case, a guard band (GB) 1004 can exist between the downlink resources 1000 and the uplink resources 1001. Actual downlink transmission can be made in a downlink bandwidth 1002 in the downlink resources 1000, and actual uplink transmission can be made in an uplink bandwidth 1003 in the uplink resources 1001. In this case, the uplink or downlink transmission band 1002 or 1003 can cause leakage 1010 toward the outside. In a region in which the downlink resources 1000 and the uplink resources 1001 are adjacent to each other (or they at least partially overlap each other), interference 1005 can occur due to the leakage 1010, and this can be referred to as adjacent channel leakage (ACL) 1005. Figure 10 An example in which the ACL 1005 occurs from the downlink resource 1000 to the uplink resource 1001 is shown. As the downlink bandwidth 1002 and the uplink bandwidth 1003 become closer to each other, the impact of the signal interference of the ACL 1005 can increase, such that the performance of the uplink or downlink transmission can deteriorate.

[0272] As an example, as shown, some resource regions 1006 in the uplink frequency band 1003 adjacent to the downlink frequency band 1002 can be significantly affected by the ACL 1005. Some resource regions 1007 in the uplink frequency band 1003 relatively far from the downlink frequency band 1002 can be less affected by the interference of the ACL 1005. In other words, the uplink frequency band 1003 can have resource regions 1006 relatively more affected by the interference and resource regions 1007 relatively less affected by the interference. For the purpose of reducing the performance deterioration, a guard band 1004 can be inserted between the downlink bandwidth 1002 and the uplink bandwidth 1003.

[0273] As the size of the guard band 1004 increases, the impact of the interference caused by the ACL 1005 between the downlink bandwidth 1002 and the uplink bandwidth 1003 can be advantageously reduced. However, as the size of the guard band 1004 increases, the resources available for transmission / reception decrease, thereby reducing resource efficiency. Conversely, as the size of the guard band 1004 decreases, the amount of resources available for transmission / reception can increase. Thus, resource efficiency can increase, but the impact of the interference caused by the ACL 1005 between the downlink bandwidth 1002 and the uplink bandwidth 1003 can increase. Therefore, it is critical to determine an appropriate size of the guard band 1004 in consideration of the trade-off.

[0274] A special type of transceiver structure can be required in order to effectively handle self-interference between TX signals (or downlink / uplink signals) and RX signals (or uplink / downlink signals). For example, a transceiver structure as shown can be considered. Figure 9 A transceiver structure as shown can handle the above-described self-interference in various methods. Figure 9 A transceiver structure as shown can handle the above-described self-interference in various methods.

[0275] As an embodiment, the DPD block 911 of the TX end can pre-distort the TX signal in the digital domain, thereby minimizing power leakage to the adjacent frequency band (e.g., the ACL 1005). For example, the DPD block 911 can be implemented as a digital filter. Figure 10 The SIC block 921 of the TX can function to remove self-interference included in the RX signal (e.g., the ACL 1005). As another example, the SIC block 921 of the TX can function to remove self-interference included in the RX signal. Various other transmission / reception techniques for efficient interference control can be applied. In this case, it should be able to set the parameters of the blocks in the transceiver to appropriate values to efficiently handle interference between the transmitter and the receiver in the base station or the UE. In this case, appropriate parameter values of the blocks for efficient handling of interference can differ according to the uplink and downlink transmission resource pattern. Thus, when the uplink and downlink transmission resource pattern changes, each device can need a predetermined delay time to change the pattern.

[0276] In the disclosure, resource configurations for uplink and downlink transmission / reception in the time domain and the frequency domain are described, and embodiments for changing to a different uplink and downlink configuration in a specific uplink and downlink configuration are provided.

[0277] The following higher layer signaling can include at least one of the following signaling or a combination of one or more.

[0278] - Master Information Block (MIB)

[0279] - System Information Block (SIB) or SIB X (X = 1, 2,...)

[0280] - Radio Resource Control (RRC)

[0281] - Medium Access Control (MAC) Control Element (CE)

[0282] - UE capability report

[0283] - UE assistance information message

[0284] In addition, the L1 signaling can include at least one of the following physical layer channels or signaling methods or a combination of one or more.

[0285] - Physical Downlink Control Channel (PDCCH)

[0286] - Downlink Control Information (DCI)

[0287] - UE-specific DCI

[0288] - Group-common DCI

[0289] - Common DCI

[0290] - Scheduling DCI (e.g., DCI for scheduling downlink or uplink data)

[0291] - Non-scheduling DCI (e.g., DCI for a purpose other than scheduling downlink or uplink data)

[0292] - Physical Uplink Control Channel (PUCCH)

[0293] - Uplink Control Information (UCI)

[0294] Described herein is signaling of cell-specific configuration information for uplink and / or downlink resource configuration in time and frequency domains in XDD systems. A UE can be configured different frequency domain resources for uplink and downlink in the same time domain resources by the resource configuration for uplink or downlink described below. Accordingly, resources in which the UE can perform uplink transmission or downlink reception can be increased, and uplink coverage of the UE and the base station can be enhanced. For ease of description, the resource configuration for uplink or downlink transmission / reception is referred to as uplink-downlink configuration below.

[0295] In XDD systems, a UE can be allocated resources for transmission / reception for uplink and downlink in frequency and time domains, respectively. Accordingly, resources for uplink or downlink transmission / reception can be configured for both time and frequency domains, not only for time domain as in TDD systems. The base station can configure a guard band for the UE by resource configuration for uplink or downlink transmission / reception in time and frequency domains, thereby suppressing interference impact due to out-of-band (OOB) emission caused by the frequency bands of uplink and downlink resources being relatively close to each other compared to FDD. In addition, although uplink and downlink BWPs have the same center frequency, the UE can determine what frequency band the UE is actually scheduled and transmits / receives by resource configuration for uplink or downlink transmission / reception in time and frequency domains.

[0296] The following methods can be considered for resource configuration for uplink or downlink transmission / reception in time and frequency domains in XDD systems.

[0297] [Method 1]

[0298] To provide a UE with resource configuration for uplink or downlink transmission / reception in time and frequency domains, the base station can divide the entire frequency band into n frequency bands and transmit information indicating uplink-downlink configuration in time domain (hereinafter, simply referred to as uplink-downlink configuration information) to the UE in each frequency band. Each of the n frequency bands can be composed of a set of contiguous resource blocks or a group of contiguous resource blocks (RBs) and this can be referred to as a resource block set (RBS) or a resource block group (RBG). For ease of description, it is denoted as RBS in the present disclosure.

[0299] The uplink-downlink configuration information of each frequency band can include uplink-downlink pattern information and reference subcarrier spacing information. The uplink-downlink pattern information can include a period in which a pattern is applied in a time domain, a number of consecutive downlink time slots from a pattern start number, a number of symbols of a next time slot, and a number of consecutive uplink time slots from a pattern end number, and a number of symbols of a previous time slot. In this case, an uplink or downlink-unindicated time slot and symbol can be determined as a flexible time slot / symbol.

[0300] Figure 11 is a view illustrating an example of an uplink-downlink configuration in a time domain and a frequency domain using a pattern in a time domain in an XDD system according to an embodiment of the disclosure.

[0301] Referring to Figure 11 , the entire frequency band 1104 is divided into n = 4 RBSs 1110, 1120, 1130, and 1140, and a pattern indicating an uplink-downlink configuration in a time domain can be used for each RBS. In the illustrated example, each time slot 1101 can include 14 symbols 1102, and according to an uplink-downlink configuration, a time slot and a symbol in each pattern can be configured as a downlink resource 1105, an uplink resource 1107, or a flexible resource 1106.

[0302] As an example, a pattern period 1115 of the RBS1 1110 can be set to five time slots (or 5 ms for a subcarrier spacing of 15 kHz), a number of consecutive downlink time slots from a pattern start number 1111 can be set to three, a number of downlink symbols of a next time slot 1113 is four, a number of consecutive uplink time slots from a pattern end number 1113 is one, and a number of uplink symbols of a previous time slot 1114 is three. The uplink-downlink configurations 1121, 1122, 1123, and 1124 of the RBS2 1120 can be the same as those of the RBS1 1110.

[0303] The uplink-downlink pattern cycle 1135 of the RBS3 1130 can be set to two slots (or 2ms for a subcarrier spacing of 15kHz), the number of consecutive downlink slots from the start number of the pattern can be set to zero, the number of downlink symbols of the next slot 1132 is six, the number of consecutive uplink slots from the end number of the pattern 1133 is one, and the number of uplink symbols of the previous slot 1134 is four. The uplink-downlink pattern cycle 1145 of the RBS4 1140 can be set to two slots (or 2ms for a subcarrier spacing of 15kHz), the number of consecutive downlink slots from the start number of the pattern can be set to zero, the number of downlink symbols of the next slot is zero, the number of consecutive uplink slots from the end number of the pattern 1133 is two, and the number of uplink symbols of the previous slot 1134 is zero.

[0304] Since the uplink-downlink configuration is configured in each RBS in limited overhead for the uplink-downlink configuration, the uplink or downlink resource can be relatively flexibly configured in the time domain.

[0305] [Method 2]

[0306] For the uplink-downlink configuration in the time domain and the frequency domain of the UE, the base station can divide the entire frequency band into n frequency bands and transmit information indicating the uplink-downlink configuration in the frequency domain (hereinafter, simply referred to as uplink-downlink configuration information) to the UE in each frequency band. The uplink-downlink configuration information of each pattern can include uplink-downlink pattern information and reference subcarrier spacing information. The uplink-downlink pattern information can include the number of slots / symbols in the time domain having the same pattern, the number of consecutive downlink RBSs from the start number of the entire frequency band, the number of downlink RBs in the next RBS, the number of consecutive uplink RBSs from the end number of the entire frequency band, and the number of uplink RBs of the previous RBS. In this case, the RBS and RB not indicated as uplink and downlink can be determined as flexible RBS / RB.

[0307] Figure 12 is a view illustrating an example of an uplink-downlink configuration in the time domain and the frequency domain using a pattern in the frequency domain in an XDD system according to an embodiment of the disclosure.

[0308] Reference Figure 12 , the entire frequency band 1200 is divided into n = 4 RBSs 1201, 1202, 1203, and 1204, and an uplink-downlink configuration can be used for each pattern in the frequency domain for each RBS. Each RBS can include 24 RBs, and according to the uplink-downlink configuration, the RBs in each pattern can be set as downlink resources 1205, uplink resources 1207, or flexible resources 1206.

[0309] As an example, the period 1211 of the first pattern 1210 can be set to four slots (or 4 ms for a subcarrier spacing of 15 kHz), the number of consecutive downlink RBSs from the start number of the entire frequency band 1212 can be set to two, the number of downlink RBs of the next RBS 1213 is 12, the number of consecutive uplink RBSs from the end number of the entire frequency band 1214 is one, and the number of uplink RBs of the previous RBS 1215 is four. The period 1221 of the second pattern 1220 can be set to one slot (or 1 ms for a subcarrier spacing of 15 kHz), and the number of consecutive uplink RBSs from the end number of the entire frequency band 1224 can be set to four.

[0310] When the first pattern 1210 and the second pattern 1220 are configured by the base station, the two patterns 1210 can be repeatedly applied in the time domain with their respective periods 1211 and 1220.

[0311] Since the uplink-downlink resources are configured in the frequency domain with a time domain period for each pattern in the limited overhead for the uplink-downlink configuration, the uplink or downlink resources can be relatively more flexibly configured in the frequency domain than in the time domain. In this case, in the XDD system, a guard band can be effectively configured as a scheme for reducing interference of out-of-band emission caused when the base station transmits a downlink channel or signal in a downlink resource on uplink channel or signal reception.

[0312] The XDD system requires dividing the entire frequency resource into a specific unit to apply the uplink-downlink configuration, rather than simply dividing the uplink and downlink resources in the time domain as in the TDD system. As an example, when the entire frequency band is 100 MHz and the subcarrier spacing is 30 kHz, the entire frequency band can be composed of 273 RBs. In this case, a large amount of overhead is required to configure each of the 273 RBs as an uplink or downlink resource.

[0313] Therefore, the XDD system can consider the following methods for dividing the frequency band to apply the time and frequency domain uplink-downlink configuration.

[0314] [Method 1]

[0315] The RBs of the entire frequency band can be composed of n groups each including a specific number of RBs. The number of RBs per group can be indicated by the uplink-downlink configuration or set to a value agreed in advance between the base station and the UE. As an example, when the subcarrier spacing (SCS) is 30 kHz and the entire frequency band is 100 MHz, the total number of RBs is 273. The number of RBs per group can be included in the uplink-downlink configuration to be indicated or agreed in advance between the base station and the UE. If the number of RBs per group is set to 24, n = [total number of RBs / number of RBs configured per group] = [273 / 24] = a total of 12 groups can be configured. The number of RBs per group can be effectively determined to reduce the overhead of the uplink-downlink configuration of the frequency domain.

[0316] The setting of the number of RBs per group configuring the RBs of the frequency band into n groups of a specific number of RBs is not limited to a value indicated by signaling of the uplink-downlink configuration or agreed in advance, but can also be indicated by at least one of a system information block, UE-specific configuration information through dedicated higher layer signaling, a medium access control (MAC) control element (CE), and L1 signaling (i.e., downlink control information).

[0317] [Method 2]

[0318] The entire frequency band can be composed of n groups having a specific frequency band. The frequency bandwidth of the specific frequency band belonging to each group can be indicated by the uplink-downlink configuration or determined as a value agreed in advance between the base station and the UE. As an example, if the frequency band per group in the entire 100 MHz frequency band is indicated as 20 MHz by the uplink-downlink configuration or set as 20 MHz according to a pre-configuration agreed in advance between the base station and the UE, n = [total frequency band / frequency band configured per group] = [100 / 20] = a total of 5 groups can be configured. The frequency bandwidth per group can be effectively determined to reduce the overhead of the uplink-downlink configuration of the frequency domain.

[0319] The setting of the frequency bandwidth per group configuring the entire frequency band into n groups of a specific frequency bandwidth is not limited to a value indicated by signaling of the uplink-downlink configuration or agreed in advance, but can also be indicated by at least one of a system information block agreed in advance, UE-specific configuration information through dedicated higher layer signaling, a MAC CE, and L1 signaling (e.g., downlink control information).

[0320] [Method 3]

[0321] The entire band can be composed of two groups divided by a guard band. The band of the guard band can be indicated by an uplink-downlink configuration, and two groups including a lower band and a higher band than the guard band, respectively, can be configured around the guard band. As an example, if 50 carrier resource blocks (CRBs) are configured starting from the 100th CRB with respect to a reference point A, which means a frequency point as a guard band in the entire 100 MHz band, the reference point A to the 99th CRB as a band lower than the guard band can become a first group, and the 150th CRB to the last CRB as a band higher than the guard band can become a second group.

[0322] The two groups can be effectively determined to reduce the overhead of the frequency domain for the uplink-downlink configuration. It is very difficult for a base station to implement non-continuous allocation of downlink resources and uplink resources at the same point in time, and interference caused by OOB can occur between uplink and downlink. Therefore, if the downlink or the uplink should always be continuously configured, the two groups can be effectively divided by configuring a guard band between the downlink and the uplink. The UE can receive the start position (e.g., CRB number) and the size (e.g., number of CRBs) of the guard band from the base station through the uplink-downlink configuration, and divide the entire band into two groups with respect to the guard band.

[0323] The setting of the guard band for configuring the entire band into two groups is not limited to a value indicated by signaling of the uplink-downlink configuration, but can also be indicated by at least one of a pre-agreed value, system information block, UE-specific configuration information through dedicated higher layer signaling, MAC CE, and L1 signaling (e.g., downlink control information).

[0324] According to embodiments of the disclosure, uplink and downlink resources can be flexibly configured in the time domain and the frequency domain. Therefore, one time-frequency resource can be configured as uplink or downlink. Hereinafter, in the disclosure, each time-frequency resource configured as uplink or downlink is referred to as "uplink-downlink configuration (UL-DL configuration)". The uplink-downlink configuration can include any one of downlink symbol, uplink symbol, and flexible symbol configuration. For example, one uplink-downlink configuration can correspond to one or more DL-UL patterns indicated by the uplink-downlink configuration information exemplified in Table 1. Figure 6 For example, one uplink-downlink configuration can correspond to one or more DL-UL patterns indicated by the uplink-downlink configuration information exemplified in Table 2. Figure 11 For example, one uplink-downlink configuration can correspond to one or more DL-UL patterns indicated by the uplink-downlink configuration information exemplified in Table 2. Figure 12 For example, one uplink-downlink configuration can correspond to one or more DL-UL patterns indicated by the uplink-downlink configuration information exemplified in Table 2.

[0325] According to an embodiment, the uplink-downlink configuration can be changed statically, semi-statically, or dynamically. The base station can transmit or indicate the uplink-downlink configuration information by at least one of [a combination of higher layer signaling or L1 signaling] and [a combination of higher layer signaling and L1 signaling]. As an example, the base station can set the uplink-downlink configuration through higher layer signaling. For example, the base station can set one or more uplink-downlink configurations through higher layer signaling, and activate one of the uplink-downlink configurations through higher layer signaling (e.g., RRC signaling or MAC CE) or L1 signaling. If the UE receives or is indicated the uplink-downlink configuration from the base station, reception can be expected for resources configured as downlink and transmission can be expected for resources configured as uplink. The various signaling methods of the uplink-downlink configuration are as described above.

[0326] According to an embodiment of the disclosure, the uplink-downlink configuration can be changed based on L1 signaling (e.g., DCI). The base station can transmit, to the UE through the PDCCH, a DCI format including a change indicator for changing the uplink-downlink configuration A to the uplink-downlink configuration B (where B is different from A). The UE can receive, from the base station, the DCI format containing the change indicator for changing the uplink-downlink configuration, and change the current uplink-downlink configuration A to the uplink-downlink configuration B based on the change indicator in the DCI format. After the change, the uplink-downlink configuration B can be indicated explicitly or implicitly by the change indicator, or can be agreed in advance between the base station and the UE.

[0327] According to an embodiment of the disclosure, a table consisting of a plurality of uplink-downlink configurations can be configured to the UE from the base station through higher layer signaling or predefined in the base station and the UE. For example, an "uplink-downlink configuration table" consisting of N uplink-downlink configurations {uplink-downlink configuration #1, uplink-downlink configuration #2, uplink-downlink configuration #3, …, uplink-downlink configuration #N} can be predefined or transmitted to the UE from the base station through higher layer signaling. The base station can transmit, to the UE through L1 signaling (e.g., DCI format), a change indicator indicating the uplink-downlink configuration #X to be activated in the uplink-downlink configuration table. The UE can activate the uplink-downlink configuration #X indicated by the change indicator in the L1 signaling (e.g., DCI format) received from the base station based on the uplink-downlink configuration table.

[0328] According to an embodiment of the disclosure, when the uplink-downlink configuration is changed, a change delay time T 延迟 As described above, parameters of blocks in a transceiver for effectively handling interference between downlink and uplink can be configured according to an uplink-downlink transmission resource pattern, so that a predetermined delay time T 延迟 The transceiver parameters are changed according to a change in the uplink-downlink configuration.

[0329] Figure 13 is a view showing an example of uplink-downlink configuration change according to an embodiment of the disclosure.

[0330] Figure 13 An example in which a configuration change occurs between uplink-downlink configuration A 1303 and uplink-downlink configuration B 1304 is shown. As an example, uplink-downlink configurations A and B can be selected from an uplink-downlink configuration table shared between a base station and a UE. A resource unit in a time domain can be a symbol or a slot or other various time units, and in the example shown, it is assumed to be a slot unit. In the example shown, the base station can transmit an uplink-downlink configuration change indicator 1310 to the UE, and the change indicator 1310 can indicate that the uplink-downlink configuration A 1303 is changed to the uplink-downlink configuration B 1304. As an example, the change indicator 1310 can include information for explicitly or implicitly indicating the uplink-downlink configuration B 1304 to be changed. As an example, the uplink-downlink configuration B 1304 to be changed can be pre-agreed between the base station and the UE, and the change indicator 1310 can include information for triggering the uplink-downlink configuration change.

[0331] In order to change the uplink-downlink configuration A 1303 to the uplink-downlink configuration B 1304, a change delay time T 延迟 1320 can be required in the base station and the UE. In other words, the base station can transmit the change indicator 1310 in a slot n to change the uplink-downlink configuration and start performing uplink and downlink operations based on the changed uplink-downlink configuration from a slot n+T 延迟 1320. Likewise, upon receiving the change indicator in the slot n from the base station, the UE can start performing uplink and downlink operations based on the changed uplink-downlink configuration from a slot n+T 延迟 1320.

[0332] In the example shown, the change indicator 1310 indicating the change to the uplink-downlink configuration B 1304 can be transmitted in slot 3. In one embodiment, T 延迟 1320 can be agreed upon in advance between the base station and the UE, for example, "2". The base station can start the transmission / reception operation according to the uplink-downlink configuration B 1304 in slot 6, which is a slot two slots after slot 3. Likewise, after receiving the change indicator 1310 in slot 3, the UE expects to perform the transmission / reception operation according to the uplink-downlink configuration B 1304 from slot 6.

[0333] According to an embodiment of the disclosure, when a "change delay condition" agreed upon in advance between the base station and the UE is satisfied, the change delay time T 延迟 1320 can be applied conditionally. In one embodiment, when the change delay condition is satisfied, the base station and the UE can consider T 延迟 1320 as a value greater than 0, such as a value agreed upon in advance, and when the change delay condition is not satisfied, the base station and the UE can consider T 延迟 1320 as 0. The change delay condition can include, for example, at least one of the following conditions or a combination of at least one or more conditions.

[0334] [Condition 1]

[0335] When the uplink-downlink direction in a specific frequency domain resource is changed by the uplink-downlink configuration A before the change and the uplink-downlink configuration B after the change, a change delay time T 延迟 may be required to be greater than 0. For example, in the example of Figure 13 , for the same frequency domain resource 1307, the uplink-downlink configuration A 1303 before the change indicates uplink, but the uplink-downlink configuration B 1304 can indicate downlink. Therefore, when a change in direction between uplink and downlink occurs in the same frequency domain resource, a change delay time T 延迟 1320 can be required. In other words, since the uplink-downlink configuration in the same frequency domain resource is changed, the uplink-downlink interference state can be different from before, and the base station or the UE needs additional time to set the parameters of the transceiver to new values, and a change delay time T 延迟 may be required to ensure the above additional time.

[0336] [Condition 2]

[0337] When the guard band is changed in the uplink-downlink configuration A before the change and the uplink-downlink configuration B after the change (for example, when the location or size of the guard band is changed), a change delay time T 延迟 may be required to be greater than 0. For example, in the example of Figure 13 In the example of FIG. 13, the uplink-downlink configuration A 1303 before the change includes a guard band 1305, and the uplink-downlink configuration B 1304 after the change includes a guard band 1306. The guard bands 1305 and 1306 are preset in different locations. When the guard bands are changed like this, it can be necessary to change the delay time T 延迟 1320.

[0338] The guard band in each uplink-downlink configuration has a required size and location considering interference between uplink and downlink. In other words, the configuration of the guard band can also be different according to the uplink-downlink configuration, and the change of the guard band can mean a change in the interference environment between uplink and downlink. Therefore, if the guard band is changed due to the change of the uplink-downlink configuration, the uplink-downlink interference state can be made different from before. Therefore, the base station or the UE needs additional time to set the parameters of the transceiver to optimal values, and it can be determined that the delay time T 延迟 needs to be changed to secure the above-mentioned additional time.

[0339] [Condition 3]

[0340] When the uplink-downlink configuration A before the change corresponds to a specific uplink-downlink configuration X, it can be necessary to change the delay time T 延迟 1320. In one embodiment, the specific uplink-downlink configuration X can be predefined, or can be explicitly preset to the UE by the base station through higher layer signaling, or can be implicitly determined by a system parameter. In one embodiment, one or more specific uplink-downlink configurations X can be defined. In one embodiment, an uplink-downlink configuration set X including a plurality of specific uplink-downlink configurations can be configured. When the uplink-downlink configuration A before the change is included in the uplink-downlink configuration set X, the base station and the UE can determine that the delay time needs to be changed.

[0341] [Condition 4]

[0342] When the uplink-downlink configuration B after the change corresponds to a specific uplink-downlink configuration Y, it can be necessary to change the delay time T 延迟 1320. In one embodiment, the specific uplink-downlink configuration Y can be predefined, explicitly preset to the UE by the base station through higher layer signaling, or implicitly determined by a system parameter. In one embodiment, one or more specific uplink-downlink configurations Y can be defined. In one embodiment, a set of uplink-downlink configurations Y including a plurality of specific uplink-downlink configurations can be configured. When the changed uplink-downlink configuration B is included in the set of uplink-downlink configurations Y, the base station and the UE can determine that the delay time needs to be changed.

[0343] [Condition 5]

[0344] When the pre-change uplink-downlink configuration A corresponds to the specific uplink-downlink configuration X and the post-change uplink-downlink configuration B corresponds to the specific uplink-downlink configuration Y, the delay time T 延迟 1320. In one embodiment, the specific uplink-downlink configuration X and the specific uplink-downlink configuration Y can be predefined, explicitly preset to the UE by the base station through higher layer signaling, or implicitly determined by a system parameter. In one embodiment, one or more specific uplink-downlink configurations X and one or more specific uplink-downlink configurations Y can exist. In one embodiment, a set of uplink-downlink configurations X including a plurality of uplink-downlink configurations and a set of uplink-downlink configurations Y including a plurality of uplink-downlink configurations can be configured. When the pre-change uplink-downlink configuration A is included in the set of uplink-downlink configurations X and the post-change uplink-downlink configuration B is included in the set of uplink-downlink configurations Y, the base station and the UE can determine that the delay time needs to be changed.

[0345] According to embodiments of the disclosure, the uplink-downlink change delay time T 延迟 1320. In other words, the base station and the UE can always delay the change of the uplink-downlink configuration based on the change delay time T 延迟 , regardless of the above change delay conditions.

[0346] According to embodiments of the disclosure, the uplink-downlink change delay time T 延迟 may be predefined as a fixed value greater than 0. The base station and the UE can delay the change of the uplink-downlink configuration based on the predefined T 延迟 value.

[0347] According to an embodiment of the disclosure, an uplink-downlink change delay time T 延迟 may be explicitly set or informed through at least one higher layer signaling from the base station to the UE. The base station can delay the change of the uplink-downlink configuration based on the set T 延迟 value, and the UE can delay the change of the uplink-downlink configuration based on the set T 延迟 value informed by the base station.

[0348] According to an embodiment of the disclosure, the uplink-downlink change delay time T 延迟 may be informed to the base station from the UE through UE capability signaling. The base station and the UE can delay the change of the uplink-downlink configuration based on the T 延迟 value informed through the UE capability signaling.

[0349] According to an embodiment of the disclosure, the uplink-downlink change delay time T 延迟 may be defined to be different according to a subcarrier spacing value. In other words, for a subcarrier spacing i, T 延迟，i may be defined. For example, when the subcarrier spacing is 15 kHz, T 延迟，0 may be used. When the subcarrier spacing is 30 kHz, T 延迟，1 may be used. When the subcarrier spacing is 60 kHz, T 延迟，2 may be used. When the subcarrier spacing is 120 kHz, T 延迟，3 may be used. The change delay time for each subcarrier spacing can be predetermined as a fixed value, or can also be informed through signaling between the base station and the UE.

[0350] According to an embodiment of the disclosure, the uplink-downlink change delay time T 延迟 may be defined to be the same regardless of the subcarrier spacing value.

[0351] According to an embodiment of the disclosure, the uplink-downlink change delay time T 延迟 may be defined to be different according to the uplink-downlink configuration before and / or after the change. For example, when changing from an uplink-downlink configuration A1 to an uplink-downlink configuration B1, a change delay time T 延迟，1 may be used. For example, when changing from an uplink-downlink configuration A2 to an uplink-downlink configuration B2, a change delay time T 延迟，2 may be used.

[0352] According to an embodiment of the disclosure, after the uplink-downlink configuration is changed, the base station can delay the change for a predetermined change delay time T 延迟 transmitting or receiving for the UE. For example, at least during the change delay time, the base station can delay transmission / reception of PDCCH / PDSCH / PUCCH / PUSCH of the UE. For example, the base station can not schedule transmission or reception of a channel related to the UE during the change delay time. The UE can not expect to transmit or receive during the uplink-downlink change delay time T 延迟 transmitting or receiving. When the UE receives a change indicator for an uplink-downlink configuration in a slot n and needs an uplink-downlink change delay time, the UE can not expect to transmit or receive from the slot n until the slot n+T 延迟 transmitting or receiving.

[0353] According to an embodiment of the disclosure, the uplink-downlink configuration change indicator can be transmitted to the UE from the base station in at least one of a common DCI (or a DCI format monitored in a common search space), a group-common DCI (or a DCI format monitored in a type-3 common search space), a UE-specific DCI (or a DCI format monitored in a UE-specific search space), or a DCI format including scheduling or a DCI format not including scheduling.

[0354] According to an embodiment of the disclosure, the uplink-downlink configuration change indicator can include uplink-downlink configuration information about one or more slots. In other words, the base station can transmit a change indicator indicating a new uplink-downlink configuration for one or more slots to the UE, and the UE can receive the change indicator and apply the new uplink-downlink configuration to the one or more slots. The UE can identify the one or more slots to which the new uplink-downlink configuration is applied according to signaling from the base station or a pre-agreed rule.

[0355] Figure 14 is a view illustrating an operation procedure of a base station according to an embodiment of the disclosure.

[0356] Referring to Figure 14 In step 1400, the base station can transmit uplink-downlink configuration information to the UE and perform a transmission or reception operation according to an uplink-downlink configuration indicated by the uplink-downlink configuration information. In step 1405, the base station can transmit an uplink-downlink configuration change indicator to the UE. In step 1410, the base station can determine whether the UE satisfies the change delay condition described above. In one embodiment, the determination of step 1410 can be made based on an existing uplink-downlink configuration indicated by the uplink-downlink configuration information and a new uplink-downlink configuration indicated by the change indicator transmitted in step 1405.

[0357] If it is determined that the change delay condition is satisfied, the base station can apply the new uplink-downlink configuration according to the change indicator considering the pre-agreed change delay time in step 1415. In one embodiment, the base station can be scheduled not to transmit or receive to the UE during the change delay time after transmitting the change indicator. After the delay of the change delay time, the base station can transmit or receive to the UE according to the new uplink-downlink configuration.

[0358] If it is determined that the change delay condition is not satisfied, the base station can apply the new uplink-downlink configuration immediately after transmitting the change indicator without the change delay time in step 1420. In one embodiment, the base station can start transmitting / receiving according to the new uplink-downlink configuration in the next slot after the slot in which the change indicator is transmitted.

[0359] Figure 15 is a view illustrating an operation procedure of a UE according to an embodiment of the disclosure.

[0360] Referring to Figure 15 In step 1500, the UE can receive uplink-downlink configuration information from the base station and perform a transmission or reception operation according to the uplink-downlink configuration information. In step 1505, the UE can receive an uplink-downlink configuration change indicator from the base station. In step 1510, the UE can determine whether the change delay condition described above is satisfied. In one embodiment, the determination of step 1510 can be made based on the existing uplink-downlink configuration indicated by the uplink-downlink configuration information and the new uplink-downlink configuration indicated by the change indicator received in step 1505.

[0361] If it is determined that the change delay condition is satisfied, the UE can apply the new uplink-downlink configuration according to the change indicator considering the pre-agreed change delay time in step 1515. In one embodiment, the UE can not expect to transmit or receive during the change delay time after transmitting the change indicator. If it is determined that the change delay condition is not satisfied, the UE can apply the new uplink-downlink configuration immediately after transmitting the change indicator without the change delay time in step 1520. In one embodiment, the UE can expect to start transmitting / receiving according to the new uplink-downlink configuration in the next slot after the slot in which the change indicator is received.

[0362] Figure 16 is a block diagram illustrating a structure of a UE according to an embodiment of the disclosure.

[0363] Referring to Figure 16 The UE can include the transceiver 1605, the memory 1610, and the processor 1600. The configuration of the UE is not limited to the illustrated example. For example, the UE can include more components than those shown or omit some components. Also, at least some or all of the transceiver 1605, the memory 1610, and the processor 1600 can be implemented in a single chip in the form of a system on chip (SoC).

[0364] The transceiver 1605 can transmit and / or receive signals to and from the base station. The signals can include control information and data. To this end, the transceiver 1605 can include an RF transmitter for up-converting and amplifying transmission signals, and an RF receiver for low-noise amplifying received signals and down-converting a frequency of the received signals. The transceiver 1605 can receive signals via a radio channel and provide the signals to the processor 1600, and transmit signals delivered from the processor 1600 via a radio channel. As an example, the transceiver 1605 can have the above-described configuration of the transceiver 1705. Figure 9

[0365] The memory 1610 can store programs and data necessary for the operation of the UE. The memory 1610 can store control information or data included in signals transmitted / received by the UE. The memory 1610 can include a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, or a DVD, or a combination of storage media. Also, the memory 1610 can include a plurality of memories. The memory 1610 can store programs for performing operations of changing the uplink-downlink configuration of the UE.

[0366] The processor 1600 can control a series of processes to enable the UE to operate according to at least one of the above-described embodiments. The processor 1600 can execute programs stored in the memory 1610 to control the transceiver 1605 to receive at least one of uplink-downlink configuration information, an uplink-downlink change indicator, and a set value of a change delay time from the base station, and perform transmission and reception operations according to an uplink-downlink configuration determined based on the received information.

[0367] Figure 17 is a block diagram illustrating a structure of a base station according to an embodiment of the disclosure.

[0368] Referring to Figure 17 The base station can include the transceiver 1705, the memory 1710, and the processor 1700. The configuration of the base station is not limited to the illustrated example. For example, the base station can include more components than those shown or omit some components. Also, at least some or all of the transceiver 1705, the memory 1710, and the processor 1700 can be implemented in a single chip in the form of a system on chip (SoC).

[0369] ​The transceiver 1705 can transmit and / or receive a signal to and / or from a UE. The signal can include control information and data. To this end, the transceiver 1705 can include an RF transmitter for up-converting and amplifying a transmitted signal, and an RF receiver for low-noise amplifying a received signal and down-converting a frequency of the received signal. The transceiver 1705 can receive a signal via a radio channel and provide the signal to the processor 1700, and transmit a signal transmitted from the processor 1700 via a radio channel. As an example, the transceiver 1705 can have Figure 9 the above-described configuration.

[0370] The memory 1710 can store programs and data necessary for the operation of the base station. Furthermore, the memory 1710 can store control information or data included in a signal transmitted / received by the base station. The memory 1710 can include a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, or a DVD, or a combination of storage media. Furthermore, the memory 1710 can include a plurality of memories. The memory 1710 can store a program for performing an operation of changing an uplink-downlink configuration of the base station.

[0371] The processor 1700 can control a series of processes to enable the base station to operate according to at least one of the above-described embodiments. The processor 1700 can execute a program stored in the memory 1710 to control the transceiver 1705 to transmit at least one of uplink-downlink configuration information, an uplink-downlink change indicator, and a set value of a change delay time to a UE, and perform a transmission and reception operation according to an uplink-downlink configuration of the UE determined based on the information.

[0372] The method according to the embodiments described in the specification or claims of the present disclosure can be implemented in hardware, software, or a combination of hardware and software.

[0373] When implemented in software, a computer-readable storage medium or a computer program product storing one or more programs (software modules) can be provided. The one or more programs stored in the computer-readable storage medium or the computer program product are configured to be executed by one or more processors in an electronic device. The one or more programs include instructions for enabling the electronic device to perform a method according to the embodiments described in the specification or claims of the present disclosure.

[0374] The programs (software modules or software) can be stored in random access memory, non-volatile memory including flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), a magnetic disc storage device, an optical compact disc-ROM (CD-ROM), a digital versatile disc (DVD), or other types of optical storage devices, or a magnetic cassette. Alternatively, the programs can be stored in memory composed of a combination of some or all of the memories. As each constituent memory, a plurality of memories can be included.

[0375] The programs can be stored in an attachable storage device that can be accessed via a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WAN), or a storage area network (SAN) configured in a combination thereof, or the like. The storage device can be connected to a device executing embodiments of the disclosure via an external port. A separate storage device on a communication network can be connected to a device executing embodiments of the disclosure.

[0376] In the above-described specific embodiments, components included in the disclosure are expressed in singular or plural form according to the proposed specific embodiments. However, the singular or plural form is selected to suit the proposed context for ease of description, and the disclosure is not limited to the singular or plural components. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0377] The embodiments herein are provided merely to better understand the present invention, and should not be construed as limiting the present invention thereto or thereby. In other words, it will be obvious to those of ordinary skill in the art that various changes can be made to the present invention without departing from the scope thereof. Furthermore, the embodiments can be practiced in combination. For example, the base station and the UE can operate in a combination of one embodiment and parts of another embodiment. Embodiments of the disclosure can be applied to other communication systems, and various modifications can be made thereto based on the technical spirit of the embodiments. For example, the embodiments can also be applied to an LTE system, a 5G or NR system.< / pdcch> < / mcs> < / dci> < / ss> < / bwp>

Claims

1. A method performed by a base station configured to change an uplink-downlink configuration in a wireless communication system, the method comprising: transmitting, to a UE, uplink-downlink configuration information indicating a first uplink-downlink configuration; transmitting, to the UE, a change indicator indicating a second uplink-downlink configuration; determining whether an uplink-downlink direction in a frequency domain resource is changed based on a change from the first uplink-downlink configuration to the second uplink-downlink configuration; and delaying a communication with the UE on the frequency domain resource according to the second uplink-downlink configuration during a predetermined change delay time from the transmitting of the change indicator based on the uplink-downlink direction being changed. communicating with the UE according to the second uplink-downlink configuration without applying the change delay time after the transmitting of the change indicator based on the uplink-downlink direction not being changed.

2. The method of claim 1, further comprising: determining to delay an application of the second uplink-downlink configuration for the change delay time based on a location and / or a size of a guard band between a downlink resource and an uplink resource related to the UE being changed due to the change from the first uplink-downlink configuration to the second uplink-downlink configuration.

3. The method of claim 1, further comprising: determining to delay an application of the second uplink-downlink configuration for the change delay time based on the first uplink-downlink configuration being included in a predetermined first uplink-downlink configuration set or the second uplink-downlink configuration being included in a predetermined second uplink-downlink configuration set.

4. The method of claim 1, further comprising: determining not to schedule a transmission or a reception related to the UE during the change delay time.

5. The method of claim 1, further comprising: 6.A method performed by a UE configured to change an uplink-downlink configuration in a wireless communication system, the method comprising: receiving, from a base station, uplink-downlink configuration information indicating a first uplink-downlink configuration; receiving, from the base station, a change indicator indicating a second uplink-downlink configuration; determining whether an uplink-downlink direction in a frequency domain resource is changed based on a change from the first uplink-downlink configuration to the second uplink-downlink configuration; and delaying a communication with the base station on the frequency domain resource according to the second uplink-downlink configuration during a predetermined change delay time from the receiving of the change indicator based on the uplink-downlink direction being changed. communicating with the base station according to the second uplink-downlink configuration without applying the change delay time after the receiving of the change indicator based on the uplink-downlink direction not being changed. ​ 7. The method of claim 6, further comprising: ​ 8. The method of claim 6, further comprising: determining to delay application of the second uplink-downlink configuration for the change delay time based on a location and / or a size of a guard band between downlink resources and uplink resources related to the UE being changed from the first uplink-downlink configuration to the second uplink-downlink configuration.

9. The method of claim 6, further comprising: determining to delay application of the second uplink-downlink configuration for the change delay time based on the first uplink-downlink configuration being included in a predetermined first uplink-downlink configuration set or the second uplink-downlink configuration being included in a predetermined second uplink-downlink configuration set.

10. The method of claim 6, further comprising: determining not to schedule transmission or reception related to the UE during the change delay time. 11.A device of a base station configured to change an uplink-downlink configuration in a wireless communication system, the device comprising: a transceiver configured to transmit, to a UE, uplink-downlink configuration information indicating a first uplink-downlink configuration and transmit, to the UE, a change indicator indicating a second uplink-downlink configuration; and a processor configured to determine whether an uplink-downlink direction in a frequency domain resource is changed based on a change from the first uplink-downlink configuration to the second uplink-downlink configuration and control the transceiver to delay communication with the UE according to the second uplink-downlink configuration during a predetermined change delay time from transmission of the change indicator based on the uplink-downlink direction being changed.

12. The apparatus of claim 11, wherein, the processor configured to communicate with the UE according to the second uplink-downlink configuration without applying the change delay time after transmission of the change indicator in case that the uplink-downlink direction is not changed.

13. The apparatus of claim 11, wherein, the processor configured to determine to delay application of the second uplink-downlink configuration for the change delay time based on a location and / or a size of a guard band between downlink resources and uplink resources related to the UE being changed from the first uplink-downlink configuration to the second uplink-downlink configuration.

14. The apparatus of claim 11, wherein, the processor configured to determine to delay application of the second uplink-downlink configuration for the change delay time based on the first uplink-downlink configuration being included in a predetermined first uplink-downlink configuration set or the second uplink-downlink configuration being included in a predetermined second uplink-downlink configuration set.

15. The apparatus of claim 11, wherein, the processor configured to determine not to schedule transmission or reception related to the UE during the change delay time. 16.A device of a UE configured to change an uplink-downlink configuration in a wireless communication system, the device comprising: a transceiver configured to receive, from a base station, uplink-downlink configuration information indicating a first uplink-downlink configuration, and receive, from the base station, a change indicator indicating a second uplink-downlink configuration; and a processor configured to determine whether an uplink-downlink direction in a frequency domain resource is changed based on a change from the first uplink-downlink configuration to the second uplink-downlink configuration, and control the transceiver to delay a communication with the base station according to the second uplink-downlink configuration during a predetermined change delay time from a time of transmitting the change indicator based on the uplink-downlink direction being changed.

17. The apparatus of claim 16, wherein, the processor is configured to communicate with the base station according to the second uplink-downlink configuration without applying the change delay time after transmitting the change indicator based on the uplink-downlink direction not being changed.

18. The apparatus of claim 16, wherein, the processor is configured to determine to delay application of the second uplink-downlink configuration for the change delay time based on a location and / or size of a guard band between a downlink resource and an uplink resource related to the UE being changed due to the change from the first uplink-downlink configuration to the second uplink-downlink configuration.

19. The apparatus of claim 16, wherein, the processor is configured to determine to delay application of the second uplink-downlink configuration for the change delay time based on the first uplink-downlink configuration being included in a predetermined first uplink-downlink configuration set or the second uplink-downlink configuration being included in a predetermined second uplink-downlink configuration set.

20. The apparatus of claim 16, wherein, the processor is configured to determine that a transmission or reception related to the base station is not scheduled during the change delay time.

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