KR20210042649A - Method and apparatus for transmission and reception in wireless communication system - Google Patents

Abstract

The present disclosure relates to a communication technique which converges a 5G communication system for supporting higher data rates after a 4G system with an IoT technology, and a system thereof. The present disclosure may be applied to intelligent services (e.g. smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security and safety related services, etc.) based on a 5G communication technology and an IoT-related technology. In a wireless communication system, a control signal processing method includes the steps of: receiving a first control signal transmitted from a base station; processing the received first control signal; and transmitting a second control signal generated based on the processing to the base station.

Description

Transmission/reception method and apparatus in wireless communication system {METHOD AND APPARATUS FOR TRANSMISSION AND RECEPTION IN WIRELESS COMMUNICATION SYSTEM}

The present disclosure relates to a method and apparatus for transmitting and receiving in a wireless communication system.

Efforts are being made to develop an improved 5G communication system or a pre-5G communication system in order to meet the increasing demand for wireless data traffic after the commercialization of 4G communication systems. For this reason, the 5G communication system or the pre-5G communication system is called a communication system after a 4G network (Beyond 4G Network) or a system after an LTE system (Post LTE). In order to achieve a high data rate, the 5G communication system is being considered for implementation in the ultra-high frequency (mmWave) band (eg, the 60 giga (80 GHz) band). In order to mitigate the path loss of radio waves in the ultra-high frequency band and increase the transmission distance of radio waves, 5G communication systems include beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO). ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed. In addition, in order to improve the network of the system, in 5G communication system, evolved small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation And other technologies are being developed. In addition, in 5G systems, advanced coding modulation (ACM) methods such as Hybrid FSK and QAM Modulation (FQAM) and SWSC (Sliding Window Superposition Coding), advanced access technologies such as Filter Bank Multi Carrier (FBMC), NOMA (non-orthogonal multiple access), and sparse code multiple access (SCMA) have been developed.

Meanwhile, the Internet is evolving from a human-centered connection network in which humans create and consume information, to an Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, etc., is also emerging. In order to implement IoT, technological elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required. , M2M), and MTC (Machine Type Communication) technologies are being studied. In the IoT environment, intelligent IT (Internet Technology) services that create new value in human life by collecting and analyzing data generated from connected objects can be provided. IoT is the field of smart home, smart building, smart city, smart car or connected car, smart grid, healthcare, smart home appliance, advanced medical service, etc. through the convergence and combination of existing IT (information technology) technology and various industries. Can be applied to.

Accordingly, various attempts have been made to apply a 5G communication system (5G communication system or New Radio (NR)) to an IoT network. For example, technologies such as sensor network, machine to machine (M2M), and machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antenna, which are 5G communication technologies. . The application of a cloud radio access network (cloud RAN) as the big data processing technology described above can be said as an example of the convergence of 3eG technology and IoT technology.

As described above and with the development of a wireless communication system, a variety of services can be provided, and thus, a method for smoothly providing these services is required.

An object of the present invention is to provide an apparatus and method capable of effectively providing a service in a mobile communication system through the disclosed embodiment.

The present invention for solving the above problem is a control signal processing method in a wireless communication system, the method comprising: receiving a first control signal transmitted from a base station; Processing the received first control signal; And transmitting a second control signal generated based on the processing to the base station.

The technical problems to be achieved in the present disclosure are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those of ordinary skill in the technical field to which the present disclosure belongs from the following description. I will be able to.

According to various embodiments of the present disclosure, an apparatus and method capable of effectively providing a service in a mobile communication system can be provided.

1 is a diagram showing a basic structure of a time-frequency domain in a 5G system.
2 is a diagram illustrating a frame, subframe, and slot structure in a 5G system.
3 is a diagram illustrating an example of setting a bandwidth part in a 5G system.
4 is a diagram illustrating an example of setting a control region of a downlink control channel in a 5G system.
5 is a diagram illustrating a structure of a downlink control channel in a 5G system.
6 is a diagram illustrating an example of a method of setting a bandwidth part according to some embodiments of the present disclosure.
7 is a diagram showing an embodiment of the present invention.
8 is a block diagram illustrating an internal structure of a base station according to an embodiment of the present disclosure.
9 is a block diagram illustrating an internal structure of a base station according to an embodiment of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

In describing the embodiments, descriptions of technical contents that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to more clearly convey the gist of the present disclosure by omitting unnecessary description.

For the same reason, some components in the accompanying drawings are exaggerated, omitted, or schematically illustrated. In addition, the size of each component does not fully reflect the actual size. The same reference numerals are assigned to the same or corresponding components in each drawing.

Advantages and features of the present disclosure, and a method of achieving them will be apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, and only the present embodiments make the disclosure of the present disclosure complete, and common knowledge in the technical field to which the present disclosure pertains. It is provided to completely inform the scope of the disclosure to those who have, and the present disclosure is only defined by the scope of the claims. The same reference numerals refer to the same elements throughout the specification. In addition, in describing the present disclosure, when it is determined that a detailed description of a related function or configuration may unnecessarily obscure the subject matter of the present disclosure, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present disclosure, which may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout the present specification.

Hereinafter, the base station is a subject that performs resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a radio access unit, a base station controller, or a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, a downlink (DL) refers to a radio transmission path of a signal transmitted from a base station to a terminal, and an uplink (UL) refers to a radio transmission path of a signal transmitted from the terminal to the base station. In addition, the LTE or LTE-A system may be described below as an example, but the embodiment of the present disclosure may be applied to other communication systems having a similar technical background or channel type. For example, 5G mobile communication technology (5G, new radio, NR) developed after LTE-A may be included, and the following 5G may be a concept including existing LTE, LTE-A and other similar services. have. In addition, the present disclosure may be applied to other communication systems through some modifications without significantly departing from the scope of the present disclosure as a judgment of a person having skilled technical knowledge.

At this time, it will be appreciated that each block of the flowchart diagrams and combinations of the flowchart diagrams may be executed by computer program instructions. Since these computer program instructions can be mounted on the processor of a general purpose computer, special purpose computer or other programmable data processing equipment, the instructions executed by the processor of the computer or other programmable data processing equipment are described in the flowchart block(s). It creates a means to perform functions. These computer program instructions can also be stored in computer-usable or computer-readable memory that can be directed to a computer or other programmable data processing equipment to implement a function in a particular way, so that the computer-usable or computer-readable memory It is also possible for the instructions stored in the flow chart to produce an article of manufacture containing instruction means for performing the functions described in the flowchart block(s). Since computer program instructions can also be mounted on a computer or other programmable data processing equipment, a series of operating steps are performed on a computer or other programmable data processing equipment to create a computer-executable process to create a computer or other programmable data processing equipment. It is also possible for instructions to perform processing equipment to provide steps for executing the functions described in the flowchart block(s).

In addition, each block may represent a module, segment, or part of code that contains one or more executable instructions for executing the specified logical function(s). In addition, it should be noted that in some alternative execution examples, the functions mentioned in the blocks may occur out of order. For example, two blocks shown in succession may in fact be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order depending on the corresponding function.

In this case, the term'~ unit' used in this embodiment refers to software or hardware components such as field programmable gate array (FPGA) or application specific integrated circuit (ASIC), and'~ unit' performs certain roles. do. However,'~ part' is not limited to software or hardware. The'~ unit' may be configured to be in an addressable storage medium, or may be configured to reproduce one or more processors. Thus, as an example,'~ unit' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, and procedures. , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, database, data structures, tables, arrays, and variables. Components and functions provided in the'~ units' may be combined into a smaller number of elements and'~ units', or may be further separated into additional elements and'~ units'. In addition, components and'~ units' may be implemented to play one or more CPUs in a device or a security multimedia card. In addition, in an embodiment, the'~ unit' may include one or more processors.

The wireless communication system deviated from the initial voice-oriented service, for example, 3GPP HSPA (High Speed Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced. (LTE-A), LTE-Pro, 3GPP2's High Rate Packet Data (HRPD), UMB (Ultra Mobile Broadband), and IEEE's 802.16e. It is evolving into a communication system.

As a representative example of the broadband wireless communication system, the LTE system employs an Orthogonal Frequency Division Multiplexing (OFDM) scheme in a downlink (DL), and a single carrier frequency division multiplexing (SC-FDMA) scheme in an uplink (UL). Access) method is adopted. Uplink refers to a radio link through which a terminal (UE (User Equipment) or MS (Mobile Station)) transmits data or control signals to a base station (eNode B or base station (BS)), and downlink refers to a base station It means a wireless link that transmits data or control signals. In the multiple access method as described above, it is possible to distinguish data or control information of each user by assigning and operating time-frequency resources to carry data or control information for each user so that they do not overlap with each other, that is, orthogonality is established. I can.

As a future communication system after LTE, that is, a 5G communication system must be able to freely reflect various requirements such as users and service providers, services that simultaneously satisfy various requirements must be supported. Services considered for 5G communication systems include enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communciation (URLLC). There is this.

eMBB aims to provide a more improved data rate than the data rate supported by the existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to provide a maximum transmission rate of 20 Gbps in downlink and 10 Gbps in uplink from the viewpoint of one base station. In addition, the 5G communication system must provide the maximum transmission rate and at the same time provide the increased user perceived data rate of the terminal. In order to satisfy these requirements, it is required to improve various transmission/reception technologies including a more advanced multi-antenna (Multi Input Multi Output, MIMO) transmission technology. In addition, while transmitting signals using the maximum 20MHz transmission bandwidth in the 2GHz band used by LTE, the 5G communication system uses a wider frequency bandwidth than 20MHz in the 3~6GHz or 6GHz or higher frequency band, so the data required by the 5G communication system It can satisfy the transmission speed.

At the same time, mMTC is being considered to support application services such as Internet of Things (IoT) in 5G communication systems. In order to efficiently provide the Internet of Things, mMTC is required to support access to a large-scale terminal within a cell, improve terminal coverage, improved battery time, and reduce terminal cost. IoT is attached to various sensors and various devices to provide communication functions, so it must be able to support a large number of terminals (for example, 1,000,000 terminals/km2) within a cell. In addition, because the terminal supporting mMTC is highly likely to be located in a shaded area not covered by the cell, such as the basement of a building due to the nature of the service, it may require wider coverage compared to other services provided by the 5G communication system. A terminal supporting mMTC must be configured as a low-cost terminal, and since it is difficult to frequently exchange the battery of the terminal, a very long battery life time such as 10 to 15 years may be required.

Finally, in the case of URLLC, it is a cellular-based wireless communication service used for a mission-critical purpose. For example, remote control of robots or machinery, industrial automation, unmaned aerial vehicles, remote health care, emergency situations. Services used for emergency alerts, etc. can be considered. Therefore, the communication provided by URLLC must provide very low latency and very high reliability. For example, a service supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds, and at the same time have a requirement of a packet error rate of ^{10 -5 or less.} Therefore, for a service supporting URLLC, a 5G system must provide a smaller Transmit Time Interval (TTI) than other services, and at the same time, it is a design that allocates a wide resource in the frequency band to secure the reliability of the communication link. Requirements may be required.

The three services of 5G, namely eMBB, URLLC, and mMTC, can be multiplexed and transmitted in one system. In this case, different transmission/reception techniques and transmission/reception parameters may be used between services in order to satisfy different requirements of each service. Of course, 5G is not limited to the three services described above.

Hereinafter, the frame structure of the 5G system will be described in more detail with reference to the drawings.

1 is a diagram showing a basic structure of a time-frequency domain, which is a radio resource domain in which data or control channels are transmitted in a 5G system.

(일례로 12)개의 연속된 RE들은 하나의 자원 블록(Resource Block, RB, 104)을 구성할 수 있다. In FIG. 1, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. The basic unit of a resource in the time and frequency domain is a resource element (RE, 101), defined as 1 Orthogonal Frequency Division Multiplexing (OFDM) symbol 102 on the time axis and 1 subcarrier 103 on the frequency axis. Can be. In the frequency domain

(For example, 12) consecutive REs may constitute one resource block (RB, 104).

2 is a diagram illustrating a slot structure considered in a 5G system.

)=14). 1 서브프레임(201)은 하나 또는 복수 개의 슬롯(202, 203)으로 구성될 수 있으며, 1 서브프레임(201)당 슬롯(202, 203)의 개수는 부반송파 간격에 대한 설정 값 μ(204, 205)에 따라 다를 수 있다. 도 2의 일 예에서는 부반송파 간격 설정 값으로 μ=0(204)인 경우와 μ=1(205)인 경우가 도시되어 있다. μ=0(204)일 경우, 1 서브프레임(201)은 1개의 슬롯(202)으로 구성될 수 있고, μ=1(205)일 경우, 1 서브프레임(201)은 2개의 슬롯(203)으로 구성될 수 있다. 즉 부반송파 간격에 대한 설정 값 μ에 따라 1 서브프레임 당 슬롯 수(

)가 달라질 수 있고, 이에 따라 1 프레임 당 슬롯 수(

) 가 달라질 수 있다. 각 부반송파 간격 설정 μ에 따른

및

는 하기의 표 1로 정의될 수 있다.2 illustrates an example of a structure of a frame 200, a subframe 201, and a slot 202. One frame 200 may be defined as 10 ms. One subframe 201 may be defined as 1 ms, and thus, one frame 200 may consist of a total of 10 subframes 201. One slot 202, 203 may be defined as 14 OFDM symbols (that is, the number of symbols per slot (

)=14). One subframe 201 may be composed of one or a plurality of slots 202, 203, and the number of slots 202, 203 per subframe 201 is a set value μ (204, 205) for the subcarrier interval. ) May vary. In the example of FIG. 2, a case of μ=0 (204) and a case of μ=1 (205) as subcarrier spacing setting values are illustrated. When μ=0 (204), 1 subframe 201 may consist of 1 slot 202, and when μ=1 (205), 1 subframe 201 is 2 slots 203 It can be composed of. That is, the number of slots per subframe (

) May vary, and the number of slots per frame (

) May be different. According to each subcarrier spacing setting μ

And

May be defined in Table 1 below.

[Table 1]

Next, a bandwidth part (BWP) setting in a 5G communication system will be described in detail with reference to the drawings.

3 is a diagram illustrating an example of setting a bandwidth part in a 5G communication system.

3 shows an example in which the UE bandwidth 300 is set to two bandwidth parts, namely, bandwidth part #1 (BWP#1) 301 and bandwidth part #2 (BWP#2) 302. Shows. The base station may set one or a plurality of bandwidth parts to the terminal, and may set the following information for each bandwidth part.

[Table 2]

Of course, it is not limited to the above example, and in addition to the configuration information, various parameters related to a bandwidth part may be set in the terminal. The information may be transmitted from the base station to the terminal through higher layer signaling, for example, Radio Resource Control (RRC) signaling. At least one of the set one or a plurality of bandwidth parts may be activated. Whether or not to activate the configured bandwidth part may be semi-statically transmitted from the base station to the terminal through RRC signaling or may be dynamically transmitted through downlink control information (DCI).

According to some embodiments, the terminal before the radio resource control (RRC) connection may receive an initial bandwidth part (Initial BWP) for initial access from the base station through a master information block (MIB). More specifically, the UE is a physical downlink control channel (PDCCH) for receiving system information (Remaining System Information; RMSI or System Information Block 1; may correspond to SIB1) required for initial access through the MIB in the initial access step. ) Can be transmitted to the control area (Control Resource Set, CORESET) and the setting information about the search space (Search Space) can be received. The control region and the search space set as the MIB may be regarded as identifiers (Identity, ID) 0, respectively. The base station may notify the terminal of configuration information such as frequency allocation information, time allocation information, and numerology for control region #0 through the MIB. In addition, the base station may notify the terminal of the setting information for the monitoring period and occasion for the control region #0, that is, the setting information for the search space #0 through the MIB. The UE may consider the frequency domain set to control region #0 obtained from the MIB as an initial bandwidth part for initial access. In this case, the identifier (ID) of the initial bandwidth part may be regarded as 0.

The configuration of the bandwidth part supported by the 5G can be used for various purposes.

According to some embodiments, when the bandwidth supported by the terminal is smaller than the system bandwidth, it may be supported through the bandwidth part setting. For example, the base station sets the frequency position (configuration information 2) of the bandwidth part to the terminal, so that the terminal can transmit and receive data at a specific frequency position within the system bandwidth.

In addition, according to some embodiments, the base station may set a plurality of bandwidth parts to the terminal for the purpose of supporting different neurology. For example, in order to support both transmission and reception of data using a subcarrier spacing of 15 kHz and a subcarrier spacing of 30 kHz to a terminal, two bandwidth parts may be set to a subcarrier spacing of 15 kHz and 30 kHz, respectively. Different bandwidth parts may be frequency division multiplexed, and when data is to be transmitted/received at a specific subcarrier interval, a bandwidth part set at a corresponding subcarrier interval may be activated.

In addition, according to some embodiments, for the purpose of reducing power consumption of the terminal, the base station may set bandwidth parts having different bandwidths to the terminal. For example, if the terminal supports a very large bandwidth, such as 100 MHz, and always transmits/receives data through the corresponding bandwidth, very large power consumption may occur. In particular, monitoring an unnecessary downlink control channel with a large bandwidth of 100 MHz in a situation where there is no traffic may be very inefficient in terms of power consumption. For the purpose of reducing power consumption of the terminal, the base station may set a bandwidth part of a relatively small bandwidth to the terminal, for example, a bandwidth part of 20 MHz. In a situation where there is no traffic, the UE can perform a monitoring operation in the 20 MHz bandwidth part, and when data is generated, it can transmit and receive data in the 100 MHz bandwidth part according to the instruction of the base station.

In the method of configuring the bandwidth part, UEs before RRC connection may receive configuration information for an initial bandwidth part through a master information block (MIB) in an initial access step. More specifically, the UE is a control region for a downlink control channel through which Downlink Control Information (DCI) scheduling a System Information Block (SIB) from the MIB of the PBCH (Physical Broadcast Channel) can be transmitted. CORESET) can be set. The bandwidth of the control region set as the MIB may be regarded as the initial bandwidth part, and the UE may receive a Physical Downlink Shared Channel (PDSCH) through which the SIB is transmitted through the set initial bandwidth part. In addition to receiving the SIB, the initial bandwidth part may be used for other system information (OSI), paging, and random access.

When more than one bandwidth part is configured for the terminal, the base station may instruct the terminal to change the bandwidth part by using a bandwidth part indicator field in the DCI. As an example, if the currently active bandwidth part of the terminal in FIG. 3 is bandwidth part #1 301, the base station may instruct the terminal with bandwidth part #2 302 as a bandwidth part indicator in the DCI, and the terminal receives The bandwidth part can be changed to the bandwidth part #2 302 indicated by the bandwidth part indicator in the DCI.

As described above, since the DCI-based bandwidth part change can be indicated by the PDSCH or the DCI scheduling the PUSCH (Physical Uplink Shared Channel), when the UE receives a bandwidth part change request, the PDSCH or PUSCH scheduled by the corresponding DCI It must be able to perform reception or transmission without difficulty in the changed bandwidth part. _{To this end, the standard stipulates a requirement for a delay time (T BWP} ) required when a bandwidth part is changed, and can be defined as follows, for example.

[Table 3]

The requirement for the bandwidth part change delay time supports type 1 or type 2 according to the capability of the terminal. The terminal may report a bandwidth part delay time type that can be supported to the base station.

According to the above-described requirements for the bandwidth part change delay time, when the UE receives the DCI including the bandwidth part change indicator in slot n, the UE changes to the new bandwidth part indicated by the bandwidth part change indicator in slot n+. It can be completed at a time not later than the T _BWP , and transmission/reception for a data channel scheduled by a corresponding DCI can be performed in a new bandwidth part that has been changed. When scheduling a data channel with a new bandwidth part, the base station may determine the time domain resource allocation for the data channel in consideration _{of the bandwidth part change delay time (T BWP) of the terminal.} That is, in a method of determining time domain resource allocation for a data channel when scheduling a data channel with a new bandwidth part, the base station may schedule the corresponding data channel after the bandwidth part change delay time. Accordingly, the terminal may not expect that the DCI indicating the bandwidth part change indicates a slot offset (K0 or K2) value smaller than the _{bandwidth part change delay time (T BWP ).}

If the terminal receives a DCI indicating a bandwidth part change (for example, DCI format 1_1 or 0_1), the terminal starts from the third symbol of the slot in which the PDCCH including the DCI is received, the time domain resource allocation indicator field in the DCI No transmission or reception may be performed during a time period corresponding to the start point of the slot indicated by the slot offset (K0 or K2) indicated by. For example, if the UE receives a DCI indicating a bandwidth part change in slot n, and the slot offset value indicated by the corresponding DCI is K, the UE starts the third symbol of slot n and the previous symbol of slot n+K (i.e., slot The last symbol of n+K-1) may not perform any transmission or reception.

Next, a method of setting transmission/reception related parameters for each bandwidth part in 5G will be described.

The terminal may be configured with one or a plurality of bandwidth parts from the base station, and parameters to be used for transmission/reception (eg, uplink data channel and control channel related configuration information) may be additionally set for each configured bandwidth part. For example, in FIG. 3, when the terminal has set bandwidth part #1 301 and bandwidth part #2 302, the terminal can receive transmission/reception parameter #1 for bandwidth part #1 301, For bandwidth part #2 302, transmission/reception parameter #2 may be set. When the bandwidth part #1 301 is activated, the terminal can perform transmission/reception with the base station based on the transmission/reception parameter #1, and when the bandwidth part #2 302 is activated, the transmission/reception parameter #2 is based. Thus, it is possible to perform transmission and reception with the base station.

More specifically, the following parameters may be set from the base station to the terminal.

First, for the uplink bandwidth part, the following information may be set.

[Table 4]

According to the above table, the UE transmits cell-specific (or cell common or common) transmission-related parameters from the base station (e.g., a random access channel (RACH), an uplink control channel (Physical Uplink Control Channel; PUCCH)). ), uplink data channel (Physical Uplink Shared Channel) related parameters) can be set (corresponding to BWP-UplinkCommon). In addition, the terminal is a terminal-specific (or dedicated) transmission-related parameters from the base station (e.g., PUCCH, PUSCH, non-approval-based uplink transmission (Configured Grant PUSCH), a sounding reference signal (SRS) ) Related parameters) Can be set (corresponds to BWP-UplinkDedicated).

Next, for the downlink bandwidth part, the following information may be set.

[Table 5]

According to the above table, the UE includes cell-specific (or cell common or common) reception-related parameters from the base station (e.g., a downlink control channel (PDCCH)), a downlink data channel (Physical Downlink Shared Channel). ) Related parameters) can be set (for BWP-DownlinkCommon). In addition, the terminal is a terminal-specific (or dedicated) reception-related parameters from the base station (e.g., PDCCH, PDSCH, non-approval-based downlink data transmission (Semi-persistent Scheduled PDSCH), radio link monitoring (Radio Link Monitoring) ; RLM) related parameters) can be set (corresponds to BWP-UplinkDedicated).

Next, a Synchronization Signal (SS)/PBCH block in 5G will be described.

The SS/PBCH block may mean a physical layer channel block composed of a Primary SS (PSS), a Secondary SS (SSS), and a PBCH. Specifically, it is as follows.

-PSS: A signal that serves as a reference for downlink time/frequency synchronization and provides some information of the cell ID.

-SSS: This is a reference for downlink time/frequency synchronization, and provides remaining cell ID information not provided by the PSS. Additionally, it may serve as a reference signal for demodulation of the PBCH.

-PBCH: Provides essential system information required for transmission and reception of the data channel and control channel of the terminal. The essential system information may include search space-related control information indicating radio resource mapping information of the control channel, scheduling control information for a separate data channel transmitting system information, and the like.

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

The UE may detect the PSS and SSS in the initial access phase and may decode the PBCH. The MIB can be obtained from the PBCH, and a control region (Control Resource Set; CORESET) #0 (which may correspond to a control region with a control region index of 0) can be set from this. The UE may perform monitoring on the control region #0 assuming that the selected SS/PBCH block and the demodulation reference signal (DMRS) transmitted in the control region #0 are Quasi Co Location (QCL). The terminal may receive system information from the downlink control information transmitted in control region #0. The terminal may obtain configuration information related to a random access channel (RACH) required for initial access from the received system information. The UE may transmit physical RACH (PRACH) to the base station in consideration of the selected SS/PBCH index, and the base station receiving the PRACH may obtain information on the SS/PBCH block index selected by the UE. The base station can know that the UE selects a block from among the respective SS/PBCH blocks and monitors the control region #0 associated therewith.

Next, downlink control information (DCI) in the 5G system will be described in detail.

In the 5G system, scheduling information for uplink data (or physical uplink data channel (Physical Uplink Shared Channel, PUSCH)) or downlink data (or physical downlink data channel (Physical Downlink Shared Channel, PDSCH)) is provided through DCI. It is transmitted from the base station to the terminal. The UE may monitor a DCI format for fallback and a DCI format for non-fallback for PUSCH or PDSCH. The countermeasure DCI format may consist of a fixed field predefined between the base station and the terminal, and the non-preparation DCI format may include a configurable field.

DCI may be transmitted through a physical downlink control channel (PDCCH) through channel coding and modulation. A Cyclic Redundancy Check (CRC) is attached to the DCI message payload, and the CRC can be scrambling with a Radio Network Temporary Identifier (RNTI) corresponding to the identity of the terminal. Different RNTIs may be used according to the purpose of the DCI message, for example, UE-specific data transmission, power control command, or random access response. That is, the RNTI is not explicitly transmitted, but is included in the cyclic redundancy check (CRC) calculation process and transmitted. When receiving the DCI message transmitted on the PDCCH, the terminal checks the CRC using the allocated RNTI, and if the CRC check result is correct, the terminal can know that the message has been transmitted to the terminal.

For example, DCI scheduling a PDSCH for system information (SI) may be scrambled with SI-RNTI. DCI scheduling a PDSCH for a Random Access Response (RAR) message may be scrambled with RA-RNTI. DCI scheduling a PDSCH for a paging message may be scrambled with a P-RNTI. The DCI notifying the SFI (Slot Format Indicator) may be scrambled with SFI-RNTI. DCI notifying TPC (Transmit Power Control) can be scrambled with TPC-RNTI. The DCI scheduling the UE-specific PDSCH or PUSCH may be scrambled with a Cell RNTI (C-RNTI).

DCI format 0_0 may be used as a countermeasure DCI for scheduling PUSCH, and in this case, CRC may be scrambled with C-RNTI. DCI format 0_0 in which CRC is scrambled with C-RNTI may include, for example, the following information.

[Table 6]

DCI format 0_1 may be used as a non-preparative DCI for scheduling PUSCH, and in this case, CRC may be scrambled with C-RNTI. DCI format 0_1 in which CRC is scrambled with C-RNTI may include, for example, the following information.

[Table 7]

DCI format 1_0 may be used as a countermeasure DCI for scheduling the PDSCH, and in this case, the CRC may be scrambled with C-RNTI. DCI format 1_0 in which CRC is scrambled with C-RNTI may include, for example, the following information.

[Table 8]

DCI format 1_1 may be used as a non-preparative DCI for scheduling the PDSCH, and in this case, the CRC may be scrambled with C-RNTI. DCI format 1_1 in which CRC is scrambled with C-RNTI may include, for example, the following information.

[Table 9]

Hereinafter, a method of allocating time domain resources for a data channel in a 5G communication system will be described.

The base station provides a table for time domain resource allocation information for a downlink data channel (Physical Downlink Shared Channel; PDSCH) and an uplink data channel (PUSCH) to the UE. RRC signaling). For the PDSCH, a table consisting of maxNrofDL-Allocations = 16 entries can be set, and for the PUSCH, a table consisting of maxNrofUL-Allocations = 16 entries can be set. The time domain resource allocation information includes, for example, PDCCH-to-PDSCH slot timing (corresponds to the time interval in units of slots between the time when the PDCCH is received and the time when the PDSCH scheduled by the received PDCCH is transmitted, expressed as K0) or PDCCH-to-PUSCH slot timing (corresponds to the time interval in units of slots between the time when the PDCCH is received and the time when the PUSCH scheduled by the received PDCCH is transmitted, denoted as K2), the PDSCH or PUSCH is scheduled within the slot Information on the location and length of the start symbol, the PDSCH or PUSCH mapping type, and the like may be included. For example, information such as the following table may be notified from the base station to the terminal.

[Table 10]

[Table 11]

The base station may notify the terminal of one of the entries in the table for the time domain resource allocation information to the terminal through L1 signaling (e.g., DCI) (e.g., to indicate to the'time domain resource allocation' field in the DCI. Can). The terminal may acquire time domain resource allocation information for the PDSCH or PUSCH based on the DCI received from the base station.

Hereinafter, a downlink control channel in a 5G communication system will be described in more detail with reference to the drawings.

4 is a diagram illustrating an example of a control region (Control Resource Set, CORESET) in which a downlink control channel is transmitted in a 5G wireless communication system. 4 shows the UE bandwidth part 410 as the frequency axis, and two control areas (control area #1 (401), control area #2 (402)) within one slot 420 as the time axis. It shows an example that has been made. The control regions 401 and 402 may be set in a specific frequency resource 403 within the entire terminal bandwidth part 410 on the frequency axis. The time axis may be set as one or a plurality of OFDM symbols, and this may be defined as a control region length (Control Resource Set Duration, 404). Referring to the example illustrated in FIG. 4, control area #1 401 is set to a control area length of 2 symbols, and control area #2 402 is set to a control area length of 1 symbol.

The above-described control region in 5G may be configured by the base station through higher layer signaling to the terminal (eg, system information, master information block (MIB), radio resource control (RRC) signaling). Setting the control region to the terminal means providing information such as a control region identifier, a frequency position of the control region, and a symbol length of the control region. For example, it may include the following information.

[Table 12]

In Table 12, the tci-StatesPDCCH (simply named TCI (Transmission Configuration Indication) state) configuration information is one or more SSs (Synchronization Signals) in a Quasi Co Located (QCL) relationship with the DMRS transmitted from the corresponding control region. / May include information of a physical broadcast channel (PBCH) block index or a channel state information reference signal (CSI-RS) index.

5 is a diagram illustrating an example of a basic unit of time and frequency resources constituting a downlink control channel that can be used in 5G. According to FIG. 5, the basic unit of time and frequency resources constituting the control channel may be referred to as REG (Resource Element Group, 503), and REG 503 is 1 OFDM symbol 501 on the time axis and 1 PRB on the frequency axis. (Physical Resource Block, 502), that is, it may be defined as 12 subcarriers. The base station may configure a downlink control channel allocation unit by concatenating the REG 503.

As shown in FIG. 5, when a basic unit to which a downlink control channel is allocated in 5G is a control channel element (CCE) 504, one CCE 504 may be composed of a plurality of REGs 503. When the REG 503 shown in FIG. 5 is described as an example, the REG 503 may be composed of 12 REs, and if 1 CCE 504 is composed of 6 REGs 503, 1 CCE 504 May consist of 72 REs. When a downlink control region is set, the corresponding region may be composed of a plurality of CCEs 504, and a specific downlink control channel is configured with one or more CCEs 504 according to an aggregation level (AL) within the control region. It can be mapped and transmitted. The CCEs 504 in the control area are classified by numbers, and at this time, the numbers of the CCEs 504 may be determined according to a logical mapping method.

The basic unit of the downlink control channel shown in FIG. 5, that is, the REG 503 may include both REs to which DCI is mapped and a region to which the DMRS 505, which is a reference signal for decoding them, is mapped. As shown in FIG. 5, three DMRSs 505 may be transmitted within 1 REG 503. The number of CCEs required to transmit the PDCCH may be 1, 2, 4, 8, or 16 depending on the aggregation level (AL), and the number of different CCEs indicates link adaptation of the downlink control channel. Can be used to implement. For example, when AL=L, one downlink control channel may be transmitted through L CCEs. The UE needs to detect a signal without knowing the information on the downlink control channel, and may define a search space representing a set of CCEs for blind decoding. The search space is a set of downlink control channel candidates consisting of CCEs that the UE should attempt to decode on a given aggregation level, and various aggregations that make one bundle with 1, 2, 4, 8, 16 CCEs. Since there is a level, the terminal can have a plurality of search spaces. The search space set may be defined as a set of search spaces at all set aggregation levels.

The search space may be classified into a common search space and a UE-specific search space. A certain group of UEs or all UEs may examine the common search space of the PDCCH in order to receive cell common control information such as dynamic scheduling for system information or a paging message. For example, PDSCH scheduling allocation information for transmission of SIB including cell operator information, etc. may be received by examining the common search space of the PDCCH. In the case of a common search space, since a certain group of UEs or all UEs must receive a PDCCH, it may be defined as a set of predetermined CCEs. The UE-specific PDSCH or PUSCH scheduling allocation information may be received by examining the UE-specific search space of the PDCCH. The terminal-specific search space may be defined terminal-specifically as a function of the identity of the terminal and various system parameters.

In 5G, a parameter for a search space for a PDCCH may be set from a base station to a terminal by higher layer signaling (eg, SIB, MIB, RRC signaling). For example, the base station has the number of PDCCH candidates at each aggregation level L, a monitoring period for a search space, a monitoring occasion per symbol in a slot for a search space, a search space type (common search space or terminal-specific search space), The combination of the DCI format and RNTI to be monitored in the search space, the control region index to monitor the search space, etc. can be set to the terminal. For example, it may include the following information.

[Table 13]

The base station may set one or a plurality of search space sets to the terminal according to the configuration information. According to some embodiments, the base station may set search space set 1 and search space set 2 to the terminal, and set to monitor DCI format A scrambled with X-RNTI in search space set 1 in a common search space, and search. DCI format B scrambled with Y-RNTI in space set 2 can be set to be monitored in a UE-specific search space.

According to the setting information, one or a plurality of search space sets may exist in a common search space or a terminal-specific search space. For example, search space set #1 and search space set #2 may be set as a common search space, and search space set #3 and search space set #4 may be set as terminal-specific search spaces.

In the common search space, a combination of the following DCI format and RNTI can be monitored. Of course, it is not limited to the following examples.

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

- DCI format 2_0 with CRC scrambled by SFI-RNTI

- DCI format 2_1 with CRC scrambled by INT-RNTI

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

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

In the UE-specific search space, a combination of the following DCI format and RNTI may be monitored. Of course, it is not limited to the following examples.

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

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

The specified RNTIs may follow the following definitions and uses.

C-RNTI (Cell RNTI): For UE-specific PDSCH scheduling

TC-RNTI (Temporary Cell RNTI): For UE-specific PDSCH scheduling

CS-RNTI (Configured Scheduling RNTI): For semi-statically configured UE-specific PDSCH scheduling

RA-RNTI (Random Access RNTI): For PDSCH scheduling in the random access phase

P-RNTI (Paging RNTI): PDSCH scheduling for paging transmission

SI-RNTI (System Information RNTI): For PDSCH scheduling through which system information is transmitted

INT-RNTI (Interruption RNTI): Used to inform whether or not the PDSCH is pucturing

TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to instruct the power control command for PUSCH

TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to instruct the power control command for PUCCH

TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to instruct the power control command for SRS

The DCI formats specified above may follow the definition below.

[Table 14]

The search space of the control region p in 5G and the aggregation level L in the search space set s can be expressed as the following equation.

[Equation 1]

The value of Y_(p,n ^μ _s,f ) may correspond to 0 in the case of a common search space.

In the case of a terminal-specific search space, the Y_(p,n ^μ _s,f ) value may correspond to a value that changes according to the identity of the terminal (C-RNTI or an ID set by the base station to the terminal) and a time index.

In 5G, as a plurality of search space sets may be set with different parameters (eg, parameters in Table 13), the set of search space sets monitored by the terminal may vary at each time point. For example, if search space set #1 is set to X-slot period, search space set #2 is set to Y-slot period, and X and Y are different, the terminal searches for search space set #1 in a specific slot. Both space set #2 can be monitored, and one of search space set #1 and search space set #2 can be monitored in a specific slot.

When a plurality of search space sets are set in the terminal, the following conditions may be considered in a method of determining a search space set to be monitored by the terminal.

[Condition 1: Limit the maximum number of PDCCH candidates]

The number of PDCCH candidates that can be monitored per slot does not exceed ^{M μ.} M ^μ may be defined as the maximum number of PDCCH candidate groups per slot in a cell set to a subcarrier interval of 15·2 ^{μ kHz, and may be defined by the following table.}

[Table 15]

[Condition 2: Limit the maximum number of CCEs]

The number of CCEs constituting the total search space per slot (here, the total search space means the entire CCE set corresponding to the union region of a plurality of search space sets) does not exceed ^{C μ.} C ^μ may be defined as the maximum number of CCEs per slot in a cell set to a subcarrier interval of 15·2 ^{μ kHz, and may be defined in the following table.}

[Table 16]

For convenience of explanation, a situation in which both conditions 1 and 2 are satisfied at a specific point in time is defined as "condition A". Therefore, not satisfying the condition A may mean not satisfying at least one of the conditions 1 and 2 above.

According to the settings of the search space sets of the base station, it may occur that the condition A is not satisfied at a specific time point. When condition A is not satisfied at a specific time point, the UE may select and monitor only a part of search space sets set to satisfy condition A at that time point, and the base station may transmit the PDCCH to the selected search space set.

The following method can be followed as a method of selecting some of the search spaces from the set of all search spaces.

[Method 1]

If the condition A for the PDCCH is not satisfied at a specific point in time (slot),

The terminal (or the base station) may preferentially select a search space set in which a search space type is set as a common search space among search space sets existing at a corresponding time point over a search space set set as a terminal-specific search space.

When all search space sets set as common search spaces are selected (i.e., when condition A is satisfied even after selecting all search spaces set as common search spaces), the terminal (or base station) is a terminal-specific search space You can select search space sets set to. In this case, when there are a plurality of search space sets set as a terminal-specific search space, a search space set having a low search space set index may have a higher priority. In consideration of the priority, the terminal-specific search space sets may be selected within a range in which condition A is satisfied.

Hereinafter, a carrier aggregation and scheduling method in a 5G communication system will be described in detail.

The terminal may be configured with a plurality of cells (Cell or CC (Component Carrier)) from the base station, and may be configured whether to schedule cross-carrier for cells configured in the terminal. If a specific cell (cell A, scheduled cell) is configured for cross-carrier scheduling, PDCCH monitoring for cell A is not performed in cell A, and other cells indicated by cross-carrier scheduling (cell B , May be performed in a scheduling cell). In this case, the scheduled cell (Cell A) and the scheduled cell (Cell B) may be set to different numerology. Here, the numerology may include a subcarrier spacing, a cyclic prefix, and the like. When the neurology of cell A and cell B is different, when the PDCCH of cell B schedules the PDSCH of cell A, the following minimum scheduling offset may be additionally considered between the PDCCH and the PDSCH.

[Cross-carrier scheduling method]

-If the subcarrier spacing of cell B (μ _B ) is less than the subcarrier spacing of cell A (μ _A ), the PDSCH may be scheduled from the last symbol of the PDCCH received in cell B to the next PDSCH slot corresponding to the X symbol. . Where X may be defined, as X = 8 symbol when X = 4 symbols, μ _B = 60kHz when X = 4 symbols, μ _B = 30kHz when, μ _B = 15kHz can be different according to the μ _B.

-If the subcarrier spacing of cell B (μ _B ) is larger than the subcarrier spacing of cell A (μ _A ), the PDSCH may be scheduled from a time point after the X symbol from the last symbol of the PDCCH received by cell B. Where X may be defined as when X = 8 symbols, μ _B = 120kHz when X = 4 symbols, μ _B = 60kHz when may vary depending on the _{μ B, μ B = 30kHz,} X = 12 symbols.

Hereinafter, embodiments of the present disclosure will be described in detail together with the accompanying drawings. Hereinafter, an embodiment of the present disclosure will be described using a 5G system as an example, but the embodiment of the present disclosure may be applied to other communication systems having a similar technical background or channel type. For example, LTE or LTE-A mobile communication and mobile communication technology developed after 5G may be included therein. Accordingly, the embodiments of the present disclosure may be applied to other communication systems through some modifications without significantly departing from the scope of the present disclosure, as determined by a person skilled in the art.

In addition, in describing the present disclosure, when it is determined that a detailed description of a related function or configuration may unnecessarily obscure the subject matter of the present disclosure, the detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present disclosure, which may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout the present specification.

In the following description of the present disclosure, higher layer signaling may be signaling corresponding to at least one or a combination of one or more of the following signaling.

- MIB (Master Information Block)

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

- Radio Resource Control (RRC)

- MAC (Medium Access Control) CE (Control Element)

In addition, L1 signaling may be signaling corresponding to at least one or a combination of one or more of the following physical layer channels or signaling methods using signaling.

- PDCCH (Physical Downlink Control Channel)

- DCI (Downlink Control Information)

- UE-specific DCI

- Group common DCI

- Common DCI

- Scheduling DCI (for example, DCI used for the purpose of scheduling downlink or uplink data)

- Non-scheduled DCI (for example, DCI that is not for the purpose of scheduling downlink or uplink data)

- PUCCH (Physical Uplink Control Channel)

- UCI (Uplink Control Information)

<First Example>

In 5G, the UE may receive one or more bandwidth parts set from the base station, and may receive configuration information for various system parameters required for uplink transmission or downlink reception for each set bandwidth part. The terminal may receive a bandwidth part activation setting or indicator from the base station, and the terminal may perform a transmission/reception operation with the base station based on a system parameter set in the activated bandwidth part.

Since the transmission/reception related parameter can be set for each bandwidth part, the terminal can change the transmission/reception related parameter through the change of the bandwidth part. For example, if the terminal is set to transmit/receive parameter #1 in bandwidth part #1 and transmit/receive parameter #2 in bandwidth part #2, the terminal performs a change from bandwidth part #1 to bandwidth part #2. If so, this may entail changing the transmission/reception parameter #1 to the transmission/reception parameter #2. In this way, the terminal can change the transmission/reception parameter by changing the bandwidth part. The base station can instruct to change the bandwidth part of the terminal for various purposes, for example, for the purpose of reducing power consumption of the terminal, the purpose of extending coverage, reducing the delay time, and improving the throughput. Transmission/reception with the base station can be performed with transmission/reception parameters optimized for use.

Since the operation of changing the setting information of the above-described transmission/reception parameter requires a change of the bandwidth part, basically, a delay time according to the change of the bandwidth part is involved. For example, the bandwidth part change delay time (T _BWP ) described in Table 3 above may be required. Accordingly, the operation of changing the transmission/reception parameter setting of the terminal may be inefficient. The bandwidth part change delay time may require a relatively long time or a short time depending on which of the parameters set in the bandwidth part is changed. For example, if the terminal changes the bandwidth part, the location and bandwidth of the bandwidth part or numerology (e.g., Cyclic Prefix length or subcarrier spacing (SCS), etc.) When changed, this may require a relatively long bandwidth part change delay time for the terminal. On the other hand, when only other transmission/reception related parameters are changed while the location and bandwidth or numerology of the bandwidth part is kept the same, only a relatively short bandwidth part change delay time of the terminal may be required.

In the present disclosure, a method for setting a bandwidth part and a method for transmitting/receiving accordingly are proposed in which a terminal can more efficiently change a transmission/reception parameter based on a change of a bandwidth part.

6 is a diagram illustrating an example of setting a bandwidth part according to an embodiment of the present disclosure. In FIG. 6, the system bandwidth 600 and the terminal bandwidth 601 are shown.

According to an embodiment of the present disclosure, the terminal may receive a "first band width part" and a "second band width part" from the base station through higher layer signaling. In the example of FIG. 6, the terminal has received a total of two first band width parts 602, 603 from the base station, and a total of eight second band width parts 604, 605, ..., 611 may be configured.

According to an embodiment of the present disclosure, the terminal may receive one or more "first band width parts" from the base station, and in this case, the "first band width part" may have the following characteristics.

- The first bandwidth part may be set to have a bandwidth size smaller than the size of the system bandwidth 600 at a location within the system bandwidth 600. The location of the first bandwidth part and the size of the bandwidth may be set based on a common PRB index determined as the system bandwidth 600.

- The bandwidth size of the first bandwidth part may be set regardless of the size of the terminal bandwidth 601. That is, the bandwidth size of the first bandwidth part may be set to be greater than, equal to, or less than the terminal bandwidth 601.

- As part of the setting information of the first bandwidth part, all or part of parameters related to transmission/reception (refer to Tables 2, 4, and 5) may be included. The transmission/reception related parameter set in the first bandwidth part may be referred to as “first transmission/reception parameter”.

- One or a plurality of second band width part indexes may be included as part of the setting information of the first band width part. The second band width parts referenced by the index as setting information in the first band width part may be referred to as being in an association with the first band width part. Referring to FIG. 6 as an example, the second band width part index #1, #2, #3, #4 may be referred to as the setting information of the first band width part #1 602. In this case, the first band width part It is said that #1 (602) and the second band width part #1 (604), the second band width part #2 (605), the second band width part #3 (606), and the second band width part #4 (607) are related. Can be considered.

- The first transmit/receive parameter can be applied in common to all the second band width parts associated with the first band width part. That is, when the terminal operates with a specific second bandwidth part activated, the terminal sets all or part of the transmission/reception parameters of the second bandwidth part to the first transmission/reception parameter value set in the first bandwidth part associated with the second bandwidth part. It can be regarded as and operate. In a specific example, if the subcarrier spacing of the first bandwidth part #1 602 is set to 15 kHz, all the second bandwidth parts 604 associated with the first bandwidth part #1 602 , 605, 606, 607) can be regarded as 15 kHz. In this way, common parameters that can be used in common in the second bandwidth parts can be all set as the first transmission/reception parameter, which is the setting information of the first bandwidth part, without the need to set for each second bandwidth part. It can be effective in reducing overhead.

- The terminal may consider a relatively long bandwidth part change delay time when changing the first bandwidth part. The delay time required when changing the first bandwidth part should be named "first delay time". The first delay time may correspond to a slot or ms time unit. The first delay time may correspond to, for example, a bandwidth part change delay time corresponding to Table 3 above.

- The maximum number of first bandwidth parts that can be set in the terminal may be determined through a capability report of the terminal. That is, the terminal may notify the base station that it supports X first band width parts through a capability report, and the base station may set a maximum number of first band width parts not exceeding X to the terminal.

According to an embodiment of the present disclosure, the terminal may receive one or more "second bandwidth parts" from the base station, and in this case, the "second bandwidth part" may have the following characteristics.

- The bandwidth size of the second bandwidth part may be set to be smaller than or equal to the size of the terminal bandwidth 601. That is, the bandwidth size of the second bandwidth part cannot be set larger than the terminal bandwidth 601.

- As part of the setting information of the second bandwidth part, all or part of parameters related to transmission/reception (refer to Tables 2, 4, and 5) may be included. The transmission/reception related parameter set in the second bandwidth part may be referred to as “second transmission/reception parameter”.

- The second transmit/receive parameter of each second bandwidth part may correspond to bandwidth part-specific information. That is, the second transmit/receive parameter of the specific second bandwidth part may be used specifically for the corresponding bandwidth part when the corresponding second bandwidth part is activated.

- If among the second transmit/receive parameters of the second bandwidth part, the same parameters as the first transmit/receive parameter of the first band width part that are related to the second band width part exist, the terminal is the value of the first transmit/receive parameter for the corresponding parameters. The value can be regarded as the second transmit/receive parameter by ignoring it. More specifically, if the PDCCH monitoring period is set to X slot as one of the first transmission/reception parameters in the first bandwidth part #1 602 in FIG. 6, the second transmission/reception in the second bandwidth part #2 605 As one of the parameters, if the PDCCH monitoring period is set to Y slot and the second bandwidth part #2 605 is activated, the UE may regard the PDCCH monitoring period as the Y slot.

- At least one of the second bandwidth parts set in the terminal may be activated, and a transmission/reception operation with the base station may be performed through the activated second bandwidth part. The terminal performs transmission/reception with the base station based on the transmission/reception parameters corresponding to the combination of the second transmission/reception parameter of the currently active second bandwidth part and the first transmission/reception parameters of the first bandwidth part related to the second bandwidth part. can do.

- The terminal may consider a relatively short bandwidth part change delay time when changing the second bandwidth part. The delay time required when changing the second bandwidth part can be referred to as "second delay time". The second delay time may correspond to a symbol unit or, in some cases, there may be no delay time required when the second bandwidth part is changed (ie, 0 delay time). The second delay time may correspond to a delay time shorter than the bandwidth part change delay time corresponding to Table 3 above, for example.

- The maximum number of second bandwidth parts that can be set in the terminal may be determined through the capability report of the terminal or may not be related to the capability report.

According to an embodiment of the present disclosure, the bandwidth part change indicator may indicate a combination of the index of the first bandwidth part and the index of the second bandwidth part described above. For example, when N first band width parts and M second band width parts per each first band width part are set, a specific agent to be activated as a DCI field corresponding to _{log 2} (N) bits + log _{2 (M) bits} The second band width part within one band width part can be indicated. As another example, if a total of L second band width parts are set, a specific second band width part to be activated may be indicated by a DCI field corresponding to _{log 2 (L) bits.} In this case, the terminal may determine whether or not which first bandwidth part is activated through a relationship with the currently activated second bandwidth part.

According to an embodiment of the present disclosure, the change of the first bandwidth part or the second bandwidth part of the terminal may be performed based on higher layer signaling or L1 signaling, or a combination of higher layer signaling and L1 signaling, or a timer. .

7 is a diagram showing an embodiment of the present invention.

In step 700, the terminal may receive configuration information for the first bandwidth part. In step 701, the terminal may receive configuration information for the second bandwidth part. In step 702, the terminal may determine whether to change the activated bandwidth part. Here, the change to the bandwidth part may include all changes to the first band width part or the second band width part. Changes to the bandwidth part can be triggered in various ways. For example, the UE may receive an activation message for a specific bandwidth part from the base station through higher layer signaling, and if the indicated bandwidth part corresponds to a bandwidth part different from the currently active bandwidth part, it may perform a bandwidth part change. have. Alternatively, the terminal may receive an activation indicator for a specific bandwidth part through L1 signaling from the base station, and if the indicated bandwidth part corresponds to a bandwidth part different from the currently active bandwidth part, it may perform a bandwidth part change. Alternatively, when the timer for the bandwidth part has expired, the terminal may change the bandwidth part to the default bandwidth part. Alternatively, the terminal may receive a pattern for a bandwidth part to be activated at a specific time from the base station in advance, and the bandwidth part change may be periodically repeated over time based on the configuration information. If it is determined in step 702 that the bandwidth part change is to be performed, the terminal may determine whether it corresponds to the change to the first bandwidth part in step 703. If, in step 703, it is determined that the first bandwidth part is changed, the terminal may apply the first bandwidth part change delay time. That is, in order to change the first bandwidth part of the terminal, at least a time corresponding to the change delay time of the first bandwidth part may be required. If, in step 703, it is not determined that the first band width part is changed, this may correspond to a case where the first band width part remains the same and only the second band width part is changed. In this case, the terminal may apply the second bandwidth part change delay time. That is, in order to change the second bandwidth part of the terminal, at least a time corresponding to the second bandwidth part change delay time may be required. The terminal can expect that no transmission/reception is performed during the bandwidth part change delay time.

In order to carry out the above-described embodiments of the disclosure, a transceiver, a memory, and a processor of a terminal and a base station are shown in FIGS. 8 and 9, respectively. In the above-described embodiments, a method of transmitting and receiving a base station and a terminal for reducing power consumption of the terminal is shown. To do this, the transmission/reception unit, memory, and processor of the base station and the terminal must each operate according to the embodiment.

8 illustrates the structure of a terminal according to an embodiment of the present disclosure.

Referring to FIG. 8, the terminal may include a transceiver 801, a memory 802, and a processor 803. However, the components of the terminal are not limited to the above-described example. For example, the terminal may include more or fewer components than the above-described components. In addition, the transmission/reception unit 801, the memory 802, and the processor 803 may be implemented in the form of a single chip.

According to an embodiment of the present disclosure, the transceiver 801 may transmit and receive signals to and from the base station. The above-described signal may include control information and data. To this end, the transceiver 801 may include an RF transmitter that up-converts and amplifies a frequency of a transmitted signal, and an RF receiver that amplifies a received signal with low noise and down-converts a frequency. In addition, the transmission/reception unit 801 may receive a signal through a wireless channel, output it to the processor 803, and transmit a signal output from the processor 803 through a wireless channel.

According to an embodiment of the present disclosure, the memory 802 may store programs and data necessary for the operation of the terminal. In addition, the memory 802 may store control information or data included in signals transmitted and received by the terminal. The memory 802 may be composed of a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD, or a combination of storage media. Also, the memory 802 may be formed of a plurality of memories. According to an embodiment of the present disclosure, the memory 802 may store a program for controlling and receiving an operation for reducing power consumption of a terminal.

According to an embodiment of the present disclosure, the processor 803 may control a series of processes in which the terminal may operate according to the above-described embodiments of the present disclosure. For example, the processor 803 may control a transmission/reception operation of a terminal according to embodiments of the present disclosure.

Specifically, the processor 803 receives setting information on the bandwidth part and transmission/reception related parameters from the base station, and applies control contents to the bandwidth part and transmission/reception related parameters based on the setting information on the bandwidth part and transmission/reception related parameters from the base station. It is possible to control each configuration of the terminal having the operation to.

Further, the processor 803 may include a plurality of processors, and by executing a program stored in the memory 802, a transmission/reception operation may be performed according to embodiments of the present disclosure.

9 shows a structure of a base station according to an embodiment of the present disclosure.

Referring to FIG. 9, the base station may include a transceiver 901, a memory 902, and a processor 903. However, the components of the base station are not limited to the above-described example. For example, the terminal may include more or fewer components than the above-described components. In addition, the transmission/reception unit 901, the memory 902, and the processor 903 may be implemented in the form of a single chip.

According to an embodiment of the present disclosure, the transmission/reception unit 901 may transmit and receive signals to and from the terminal. The above-described signal may include control information and data. To this end, the transceiver 901 may include an RF transmitter that up-converts and amplifies a frequency of a transmitted signal, and an RF receiver that amplifies a received signal with low noise and down-converts a frequency. In addition, the transmission/reception unit 901 may receive a signal through a wireless channel, output it to the processor 903, and transmit a signal output from the processor 903 through a wireless channel.

According to an embodiment of the present disclosure, the memory 902 may store programs and data required for the operation of the base station. In addition, the memory 902 may store control information or data included in signals transmitted and received by the base station. The memory 902 may be composed of a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, a DVD, or a combination of storage media. Also, the memory 902 may be formed of a plurality of memories. According to an embodiment of the present disclosure, the memory 902 may store a program for generating and transmitting control information for a transmission/reception operation of a terminal of a base station.

According to an embodiment of the present disclosure, the processor 903 may control a series of processes so that the base station can operate according to the above-described embodiment of the present disclosure. For example, the processor 903 may control each component of the base station in order to generate and transmit control information for the transmission/reception operation of the terminal.

In addition, the processor 903 may include a plurality of processors, and by executing a program stored in the memory 902, control information for transmission and reception of the terminal according to the embodiments of the present disclosure and transmission of a downlink control channel How to do it.

The methods according to the embodiments described in the claims or the specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

When implemented in software, a computer-readable storage medium or computer program product storing one or more programs (software modules) may be provided. One or more programs stored in a computer-readable storage medium or a computer program product are configured to be executable by one or more processors in an electronic device (device). The one or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.

These programs (software modules, software) include random access memory, non-volatile memory including flash memory, read only memory (ROM), and electrically erasable programmable ROM. (EEPROM: Electrically Erasable Programmable Read Only Memory), magnetic disc storage device, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or other types of It may be stored in an optical storage device or a magnetic cassette. Alternatively, it may be stored in a memory composed of a combination of some or all of them. In addition, a plurality of configuration memories may be included.

In addition, the program is accessed through a communication network such as Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination of these. It may be stored in an (access) attachable storage device. Such a storage device may access a device performing an embodiment of the present disclosure through an external port. In addition, a separate storage device on the communication network may access a device performing an embodiment of the present disclosure.

In the specific embodiments of the present disclosure described above, the constituent elements included in the present disclosure are expressed in the singular or plural according to the presented specific embodiments. However, the singular or plural expression is selected appropriately for the situation presented for convenience of description, and the present disclosure is not limited to the singular or plural constituent elements, and even constituent elements expressed in plural are composed of the singular or in the singular. Even the expressed constituent elements may be composed of pluralities.

On the other hand, the embodiments of the present disclosure disclosed in the present specification and drawings are merely provided with specific examples to easily describe the technical content of the present disclosure and to aid understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. That is, that other modified examples based on the technical idea of the present disclosure can be implemented is obvious to those of ordinary skill in the technical field to which the present disclosure belongs. In addition, each of the above embodiments can be operated in combination with each other as needed. For example, parts of one embodiment of the present disclosure and another embodiment may be combined with each other to operate a base station and a terminal. In addition, the embodiments of the present disclosure can be applied to other communication systems, and other modifications based on the technical idea of the embodiment may also be implemented. For example, the embodiments may be applied to an LTE system, a 5G or NR system, and the like.

Claims (1)

In the control signal processing method in a wireless communication system,
Receiving a first control signal transmitted from a base station;
Processing the received first control signal; And
And transmitting a second control signal generated based on the processing to the base station.

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