CN111149407B

CN111149407B - Method and apparatus for uplink resource allocation in a wireless communication system

Info

Publication number: CN111149407B
Application number: CN201880062931.0A
Authority: CN
Inventors: 吴振荣; 金泳范; 金泰亨; 朴成珍; 吕贞镐; 崔承勋
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2017-09-29
Filing date: 2018-09-28
Publication date: 2024-01-09
Anticipated expiration: 2038-09-28
Also published as: EP3673696A1; EP3673696A4; KR20190038219A; CN111149407A; KR20230107168A; AU2018341636A1; KR102642633B1; AU2018341636B2

Abstract

The present disclosure relates to a communication method and system for fusing a fifth generation (5G) communication system for supporting higher data rates beyond a fourth generation (4G) system with internet of things (IoT) technology. The present disclosure may be applied to smart services based on 5G communication technology and IoT-related technology, such as smart homes, smart buildings, smart cities, smart cars, networking cars, healthcare, digital education, smart retail, security and security services. A method for transmitting uplink control information in a wireless communication system is provided. The method comprises the following steps: receiving configuration information on a plurality of bandwidth parts (BWP) from a base station; receiving downlink control information and downlink data from a base station; receiving BWP adaptation information indicating a change in the active BWP from the base station; identifying uplink control channel resources for transmitting acknowledgement information in response to the downlink data; and transmitting acknowledgement information to the base station on the identified uplink control channel resources.

Description

Method and apparatus for uplink resource allocation in a wireless communication system

Technical Field

The present disclosure relates generally to wireless communication systems, and more particularly, to a method and apparatus for configuring uplink control channel transmission resources in a next generation mobile communication system.

Background

In order to meet the demand for wireless data services that have increased since the deployment of fourth generation (4G) communication systems, efforts have been made to develop improved fifth generation (5G) or quasi-5G communication systems. Therefore, a 5G or quasi 5G communication system is also referred to as a "super 4G network" or a "LTE-after-system". A 5G communication system is considered to be implemented in a higher frequency (millimeter wave) band (e.g., 60GHz band) in order to achieve a higher data rate. In order to reduce propagation loss of radio waves and increase transmission distance, beamforming, massive multiple-input multiple-output (MIMO), full-Dimensional multiple-input multiple-output (FD-MIMO), array antennas, analog beamforming, massive antenna techniques are discussed in 5G communication systems. Further, in the 5G communication system, development of system network improvement is underway based on advanced small cells, cloud radio access networks (Radio Access Network, RAN), ultra dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, coordinated multipoint (Coordinated Multi-Point, coMP), receiving end interference cancellation, and the like. In 5G systems, hybrid FSK and QAM modulation (Hybrid FSK and QAM Modulation, FQAM) and sliding window superposition coding (Sliding Window Superposition Coding, SWSC) as advanced code modulation (advanced coding modulation, ACM) have been developed, as well as filter bank multicarrier (Filter Bank Multi Carrier, FBMC), non-orthogonal multiple access (Non-Orthogonal Multiple Access, NOMA) and sparse code multiple access (Sparse Code Multiple Access, SCMA) as advanced access techniques.

The internet, an artificially centric connected network that is human generated and consumed information, is now evolving into an internet of things (Internet of Things, ioT) network in which distributed entities such as things exchange and process information without human intervention. Internet of things (Internet of Everything, ioE) has emerged as a combination of IoT technology and big data processing technology through connections with cloud servers. For IoT implementation, technology elements such as "sensing technology", "wired/wireless communication and network infrastructure", "service interface technology" and "security technology" are required, and sensor networks, machine-to-Machine (M2M) communication, machine-type communication (Machine-Type Communication, MTC), etc. have been recently studied. Such IoT environments may provide intelligent internet technology services that create new value for human life by collecting and analyzing data generated among things that are interconnected. With the convergence and combination between existing information technology (Information Technology, IT) and various industrial applications, ioT can be applied in a variety of fields including smart homes, smart buildings, smart cities, smart cars or networked cars, smart grids, healthcare, smart appliances, and advanced medical services.

In keeping with this, various attempts have been made to apply 5G communication systems to IoT. For example, techniques such as sensor networks, machine Type Communications (MTC), and machine-to-machine (M2M) communications may be implemented by beamforming, MIMIO, and array antennas. The application of cloud Radio Access Network (RAN) as the big data processing technology described above may also be regarded as one example of a convergence between 5G technology and IoT technology.

Unlike the conventional communication system, the recently developed next generation mobile communication system (hereinafter, interchangeably referred to as 5G system) requires flexibility in time and frequency resource utilization. In particular, it is important to ensure flexibility in control channel design.

Disclosure of Invention

[ problem ]

The invention provides a method and a device for configuring uplink control channel transmission resources in a 5G system.

[ problem solution ]

The present disclosure is made to solve the above problems and disadvantages and to provide at least the advantages described below.

According to one aspect of the present disclosure, a method for transmitting uplink control information in a wireless communication system is provided. The method comprises the following steps: receiving configuration information about a plurality of bandwidth parts from a base station; receiving configuration information on a plurality of bandwidth parts (bandwidth parts) from a base station; receiving downlink control information and downlink data from a base station; receiving BWP adaptation information indicating a change in the active BWP from the base station; identifying uplink control channel resources for transmitting acknowledgement information in response to downlink data; and transmitting acknowledgement information to the base station on the identified uplink control channel resources.

According to another aspect of the present disclosure, there is provided a method for receiving uplink control information in a wireless communication system, the method including transmitting configuration information regarding a plurality of bandwidth parts (BWP) to a terminal; transmitting downlink control information and downlink data to the terminal; transmitting BWP adaptation information indicating a change in the active BWP to the terminal; identifying uplink control channel resources for receiving acknowledgement information in response to downlink data; and receiving acknowledgement information from the terminal on the identified uplink control channel resources.

According to another aspect of the present disclosure, there is provided a terminal for transmitting uplink control information in a wireless communication system. The terminal comprises: a transceiver and a controller coupled to the transceiver. The controller is configured to: receiving configuration information about a plurality of bandwidth parts from a base station; receiving configuration information on a plurality of bandwidth parts (BWP) from a base station; receiving downlink control information and downlink data from a base station; receiving BWP adaptation information indicating a change in the active BWP from the base station; identifying uplink control channel resources for transmitting acknowledgement information in response to downlink data; and transmitting acknowledgement information to the base station on the identified uplink control channel resources.

According to another aspect of the present disclosure, there is provided a base station for receiving uplink control information in a wireless communication system. The base station comprises: a transceiver and a controller coupled to the transceiver. The controller is configured to: transmitting configuration information about a plurality of bandwidth parts (BWP) to a terminal; transmitting downlink control information and downlink data to the terminal; transmitting BWP adaptation information indicating a change in the active BWP to the terminal; identifying uplink control channel resources for receiving acknowledgement information in response to downlink data; and receiving acknowledgement information from the terminal on the identified uplink control channel resources.

[ advantageous effects of the invention ]

As described above, the uplink resource allocation method and apparatus of the present invention are advantageous in facilitating the operation of a 5G system by making it possible to flexibly allocate uplink control and data channel transmission resources.

Drawings

The foregoing and other aspects, features, and advantages of certain embodiments of the present disclosure will become more apparent from the following description, taken in conjunction with the accompanying drawings, in which:

fig. 1 is a diagram showing a basic time-frequency resource structure for transmitting downlink data and control channels in an LTE system;

Fig. 2 is a diagram showing physical downlink control channels (physical downlink control channel, PDCCH) and Enhanced PDCCH (EPDCCH) as downlink physical channels carrying LTE downlink control information (downlink control information, DCI);

fig. 3 is a diagram showing a basic unit of time and frequency resources of a downlink control channel in a 5G system;

fig. 4 is a diagram showing how a control resource set (control resource set, CORESET) for transmitting a downlink control channel in a 5G wireless communication system is configured according to an embodiment;

fig. 5 is a diagram illustrating a physical uplink control channel (physical uplink control channel, PUCCH) format used in a 5G wireless communication system according to an embodiment;

fig. 6 is a diagram illustrating a method for configuring a PUCCH format and a resource region in a 5G wireless communication system according to an embodiment;

fig. 7 is a diagram showing transmission and reception bandwidth adaptation operations according to an embodiment;

fig. 8 is a diagram showing transmission and reception bandwidth adaptation operations according to an embodiment;

fig. 9 is a diagram showing transmission and reception bandwidth adaptation operations according to an embodiment;

fig. 10 is a diagram showing transmission and reception bandwidth adaptation operations according to an embodiment;

Fig. 11 is a flowchart showing a User Equipment (UE) operation according to an embodiment;

fig. 12 is a flowchart illustrating UE operation according to an embodiment;

fig. 13 is a block diagram showing a configuration of a UE according to an embodiment; and

fig. 14 is a block diagram showing a configuration of a Base Station (BS) according to an embodiment.

Detailed Description

Various embodiments of the present disclosure are described with reference to the accompanying drawings. However, the various embodiments of the present disclosure are not limited to the particular embodiments, and it is to be understood that various modifications, equivalents, and/or alternatives to the embodiments described herein may be made.

Detailed descriptions of technical specifications well known in the art and directly unrelated to the present disclosure are omitted to avoid obscuring the subject matter of the present disclosure. Unnecessary description is omitted so as to make the subject matter of the present disclosure clear.

For the reasons described above, some elements are exaggerated, omitted, or simplified in the drawings, and in practice, these elements may have different sizes and/or shapes from those shown in the drawings. Throughout the drawings, identical or equivalent parts are indicated by identical reference numerals.

It is to be understood that the singular form of a noun corresponding to an item may include one or more things unless the relevant context clearly dictates otherwise. As used herein, each of these phrases, such as "a or B", "at least one of a and B", "at least one of a or B", "A, B or C", "at least one of A, B and C", and "at least one of A, B or C", can include any or all possible combinations of items listed together in a corresponding one of the phrases. As used herein, terms such as "first" and "second," or "first" and "second," may be used to simply distinguish a corresponding component from another and not to otherwise (e.g., importance or order) limit the components. It will be understood that if an element (e.g., a first element) is referred to as being "coupled" to, "coupled" to, "connected" or "connected" to another element (e.g., a second element), whether with the term "operatively" or "communicatively," it means that the element can be directly (e.g., wired), wirelessly, or coupled to the other element via a third element.

The advantages and features of the present disclosure and methods of accomplishing the same may be understood more readily by reference to the following detailed description of embodiments and the accompanying drawings. This disclosure may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, the embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the disclosure to those skilled in the art, and the disclosure will only be defined by the appended claims and equivalents thereof. Like reference numerals refer to like elements throughout the present disclosure.

It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer program instructions may also be stored in a non-transitory computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the non-transitory computer-readable memory produce an article of manufacture including instruction means which implement the function/act specified in the flowchart and/or block diagram block or blocks. The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.

Furthermore, various block diagrams may illustrate portions of modules, segments, or code that include at least one or more executable instructions for performing certain logical function(s). Further, it should be noted that in several modifications, the functions of the blocks may be performed in a different order. For example, two consecutive blocks may be performed substantially simultaneously or may be performed in a reverse order according to their functions.

As used herein, the term "module" may include units implemented in hardware, software, or firmware, and may be used interchangeably with other terms, such as "logic," logic block, "" portion, "or" circuit. A module may be a single integral component, or a minimal unit or portion thereof, adapted to perform one or more functions. For example, according to an embodiment, a module may be implemented in the form of an application-specific integrated circuit (ASIC). Thus, a module may include, for example, components such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functionality of the components and modules may be combined into fewer components and modules or further separated into additional components and modules. Further, the components and modules may be implemented such that they run one or more central processing units (central processing unit, CPU) in the device or secure multimedia card.

According to an embodiment, a method according to various embodiments of the present disclosure may be included and provided in a computer program product. The computer program product may be used as a product for conducting transactions between sellers and buyers. The computer program product may be distributed in the form of a machine-readable storage medium, e.g. a compact disc read only memory (compact disc read only memory, CD-ROM), or distributed online (e.g. downloaded or uploaded) via an application store, e.g. a playstore (tm), or distributed directly between two user devices, e.g. a smart phone. If distributed online, at least a portion of the computer program product may be temporarily generated or at least temporarily stored in a machine-readable storage medium, such as a memory of a manufacturer server, a server of an application store, or a relay server.

According to various embodiments, each of the above-described components (e.g., modules or programs) may include a single entity or multiple entities. According to various embodiments, one or more of the above components may be omitted, or one or more other components may be added. Alternatively or additionally, multiple components (e.g., modules or programs) may be integrated into a single component. In this case, according to various embodiments, the integrated components may still perform one or more functions of each of the plurality of components in the same or similar manner as they were performed by the respective one of the plurality of components prior to integration. According to various embodiments, operations performed by a module, program, or another component may be performed sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations may be performed in a different order or omitted, or one or more other operations may be added.

Although the description is directed to LTE and 5G systems, it should be understood by those skilled in the art that the present disclosure may be applied to other communication systems having similar technical contexts and having slightly modified channel formats without departing from the spirit and scope of the present disclosure.

Mobile communication systems have evolved into high-speed, high-quality packet data communication systems defined in the third generation partnership project (3rd Generation Partnership Project,3GPP), such as high-speed packet access (high speed packet access, HSPA), LTE (or evolved universal terrestrial radio access (evolved universal terrestrial radio access, E-UTRA)) and LTE-advanced (LTE-a), high-speed packet data (high rate packet data, HRPD) defined in the third generation partnership project 2 (3 GPP 2), and institute of electrical and electronics engineers (Institute of Electrical and Electronics Engineers, IEEE) standard 802.16E capable of providing data and multimedia services beyond early voice-oriented services.

As one of representative broadband wireless communication systems, the LTE system uses orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) in the downlink and single carrier frequency division multiple access (single carrier frequency division multiple, SC-FDMA) in the uplink. The term "uplink" (UL) refers to a radio transmission path from a terminal, which is interchangeably referred to as a UE and a Mobile Station (MS), to a BS, which is interchangeably referred to as an evolved node B (eNB). The term "downlink" (DL) refers to a radio transmission path from a BS to a terminal. Such a multiple access scheme (multiple access schemes) is characterized by allocating time-frequency resources for transmitting user-specific data and control information without overlapping each other (i.e., maintaining orthogonality) in order to distinguish among the user-specific data and control information.

As a next generation communication system following LTE, a 5G communication system should be designed to meet the requirements of various services required by users and service providers. Services supported by 5G systems can be divided into three categories, enhanced mobile broadband (enhanced mobile broadband, emmbb), large-scale machine type communication (massive machine type communication, emtc), and ultra-reliable and low-latency communication, URLLC.

The eMBB aims to provide exceptionally high data rates compared to data rates supported by legacy LTE, LTE-A and LTE-A Pro. For example, the goal of the eMBB is to increase the peak data rate of each base station to 20 gigabits/second in DL and 10 gigabits/second in UL. At the same time, the ebb aims at improving the user perceived data rate. In order to meet these requirements, there is a need for improvement in signal transmission/reception techniques including MIMO techniques. The data rate requirements for 5G communication systems can be met by using a frequency bandwidth wider than 20MHz in the frequency band of 3 to 6GHz or higher than 6GHz, instead of the current LTE frequency band of 2 GHz.

Furthermore, mctc is considered an IoT-supporting application service. In order to efficiently provide mctc-based IoT application services, it is necessary to ensure massive access resources for terminals within a cell, improve terminal coverage and battery life, and reduce device manufacturing costs. In view of the nature of IoT terminals that attach to various sensors and devices to provide communication functionality, ioT services should be designed to support a large number of terminals (e.g., 1000000 terminals/km 2) within a cell. Depending on the nature of IoT services, mctc terminals are likely to be located in coverage holes (coverage holes), such as basements of buildings, which require wider coverage than other services supported in 5G communication systems. Mctc terminals characterized by low cost and difficult battery replacement should be designed to have very long battery life.

Finally, URLLC is a cellular-based communication service for mission critical services such as telerobotic and mechanical control, industrial automation, unmanned aerial vehicles, telemedicine, and emergency alert services requiring ultra-low latency and ultra-high reliability. Therefore, the URLLC service requires ultra-low latency and ultra-high reliability. For example, the URLLC service must meet the requirements of an air interface delay less than 0.5 milliseconds and a packet error rate less than or equal to 10-5. In this regard, in order to support the URLLC service, the 5G system must support a transmission time interval (transmit time interval, TTI) shorter than that of other services and allocate a wide resource in a frequency band. Thus, 5G systems must support short TTIs for URLLC that are smaller than TTIs for other services and allocate wide resources within the frequency band to ensure reliability of the communication link.

Three classes of services (i.e., emmbb, URLLC, and mctc) can be multiplexed into one system. Different transmission/reception schemes and parameters may be used to transmit/receive different classes of services in order to meet different service specific requirements.

A description of frame structures of LTE and LTE-a systems is provided below with reference to the accompanying drawings.

Fig. 1 is a diagram illustrating a basic time-frequency resource structure for transmitting DL data and control channels in an LTE system.

Referring to fig. 1, the horizontal axis represents time, and the vertical axis represents frequency. The smallest transmission unit in the time domain is an OFDM symbol, and N _symb The OFDM symbols 101 form slots 102 and the 2 slots form subframes 103. Each slot spans (span) 0.5 milliseconds and each subframe spans 1.0 millisecond. The radio frame 104 is a time unit composed of 10 subframes. In the frequency domain, the smallest transmission unit is a subcarrier, and the total system transmission bandwidth is composed of the NBW subcarriers 105. In the time-frequency resource structure, the basic resource unit is a Resource Element (RE) 106 indicated by an OFDM symbol index and a subcarrier index. Resource Block (RB) (or physical resource block (physical resource block, PRB)) 107 is composed of N in the time domain _symb Successive OFDM symbols 101 and N in the frequency domain _RB And successive subcarriers 108. That is, one RB 107 is composed of N _symb x N _RB And each RE 106. In general, RB is the smallest unit of data transmission. In the LTE system, N _symb ＝7，N _RB =12, and NBW is proportional to the system transmission bandwidth.

Next, a description is provided of DCI for LTE and LTE-a systems.

In the LTE system, DL or UL data scheduling information is transmitted from an eNB to a UE using DCI. Depending on the purpose, DCI is classified into different DCI formats (e.g., indicating UL grant for UL data scheduling or DL grant for DL data scheduling, indicating the use of small-sized control information, indicating whether multi-antenna based spatial multiplexing is applied, and indicating the use of power control). For example, DCI format 1 for DL grant is configured to include at least the following information.

A resource allocation type 0/1 flag the resource allocation type 0/1 flag indicates whether the resource allocation scheme is type 0 or type 1. Type 0 is used to allocate resources in RBG units by applying a bitmap scheme. In the LTE system, the scheduled base unit may be an RB expressed by time-frequency domain resources, and the RBG may include a plurality of RBs and may be the scheduled base unit in a type 0 scheme. Type 1 is used to allocate a specific RB among RBGs.

Resource block allocation-resource block allocation indicates RBs allocated for data transmission. The resources may be determined depending on the system bandwidth and the resource allocation scheme.

-a modulation and coding scheme (Modulation and coding scheme, MCS) that indicates the modulation scheme used for data transmission and the size of the transport block to be transmitted.

Hybrid automatic repeat request (Hybrid automatic repeat request, HARQ) process number: HARQ process number indicates HARQ process number.

New data indicator-new data indicator indicates whether the HARQ transmission is an initial transmission or a retransmission.

Redundancy version-redundancy version indicates the redundancy version of HARQ.

Transmit power control (Transmit power control, TPC) commands of PUCCH the TPC commands of PUCCH indicate power control commands of PUCCH as UL control channel.

After undergoing a channel coding and modulation procedure, DCI may be transmitted through PDCCH or EPDCCH.

A cyclic redundancy check (cyclic redundancy check, CRC) is attached to the DCI message payload and scrambled with the UE's radio network temporary identifier (radio network temporary identifier, RNTI). For DCI messages (e.g., UE-specific data transmissions, power control commands, and random access responses), there are different types of RNTIs. That is, the RNTI is not explicitly transmitted, but is included during the CRC calculation process. When a DCI message is received on the PDCCH, the UE performs a CRC check with the allocated RNTI and determines that the message is addressed to itself if the CRC check is successful.

Fig. 2 is a diagram illustrating PDCCH and EPDCCH as DL physical channels carrying LTE DCI.

Referring to fig. 2, a pdcch 201 is time-division-multiplexed (TDM) with a physical downlink shared channel (physical downlink shared channel, PDSCH) 203 as a data channel, and is distributed across the entire system bandwidth. The control region for transmitting PDCCH 201 may be expressed by a plurality of OFDM symbols, which are indicated by a control format indicator (control format indicator, CFI) transmitted to the UE in a physical control format indicator channel (physical control format indicator channel, PCFICH). PDCCH 201 is mapped to several OFDM symbols at the beginning of a subframe, so that the UE rapidly decodes DL scheduling information for decoding DL shared channels (DL shared channel, DL shared channels) without delay, so that DL transmission delay reduction is facilitated. Assuming that the PDCCH transmits one DCI message, when a plurality of UEs schedule in DL and UL, it may occur that the PDCCH of the plurality of UEs is transmitted per cell.

A cell-specific reference signal (cell-specific reference signal, CRS) 204 is used as a reference signal for decoding PDCCH 201. CRS204 is distributed across the entire system bandwidth and is transmitted in each subframe with different scrambling and resource mapping determined from the cell Identifier (ID). The CRS204 cannot be beamformed in a UE-specific manner because it is a common reference signal used by all UEs located within the cell. Therefore, multi-antenna transmission of LTE PDCCH is limited to open loop transmit diversity. The number of CRS ports is implicitly notified to the UE via physical broadcast channel (physical broadcast channel, PBCH) decoding.

The resource allocation of the PDCCH 201 is performed based on control-channel elements (CCEs), and one CCE is composed of 9 resource element groups (resource element group, REGs) (i.e., 36 Resource Elements (REs)). PDCCH 201 may be transmitted on 1, 2, 4, or 8 CCEs, and the number of CCEs depends on the channel coding rate of the DCI message payload. The reason for using a different number of CCEs is to enable link adaptation of PDCCH 201.

The UE must detect PDCCH 201 without information related thereto by blind decoding within a search space, which is a set of CCEs. The search space is a set of CCEs consisting of aggregation levels (aggregation level, AL) that are implicitly determined based on a function of UE identity and subframe number, rather than explicitly signaled. The UE performs blind decoding on all possible resource candidates available for CCEs within the search space to decode PDCCH 201 and is verified as valid information for the UE by the CRC test process.

There are two types of search spaces, UE-specific search space and common search space. A group of UEs or all UEs may monitor the common search space of PDCCH 201 to receive cell-specific control information such as system information and dynamic scheduling of paging messages. For example, DL-SCH scheduling allocation information for transmitting system information block-1 (system information block-1, sib-1) including operator information of a cell may be received by decoding a common search space of the PDCCH 201.

As shown in fig. 2, EPDCCH 202 is multiplexed in frequency with PDSCH 203. The base station may allocate resources for EPDCCH 202 and PDSCH 203 appropriately by scheduling to efficiently support coexistence with data transmissions to legacy LTE UEs. However, a problem arises in that EPDCCH 202 spanning one subframe causes a transmission delay.

The plurality of EPDCCHs 202 may constitute an EPDCCH set to which resources are allocated by PRB pairs. The EPDCCH set positions are configured in a UE-specific manner and the EPDCCH set position information is sent via radio resource control (radio resource control, RRC) signaling. A UE may be assigned up to two EPDCCH sets and one EPDCCH set may be multiplexed with the EPDCCH sets of other UEs.

The resource allocation to the EPDCCH 202 is performed based on enhanced CCEs (ECCEs), one of which consists of 4 or 8 Enhanced REGs (EREGs), and the number of EREGs per ECCE is determined depending on a Cyclic Prefix (CP) length and subframe configuration information. One EREG consists of 9 REs, and there may be a maximum of 16 EREGs per PRB pair. There are two different ways to transmit the EPDCCH 202, "localized" and "distributed" according to the EREG to RE mapping scheme. There are 6 possible ECCE aggregation levels 1, 2, 4, 8, 16, and 32, one of which is selected based on CP length, subframe configuration, EPDCCH format, and transmission scheme.

EPDCCH 202 is only transmitted in the UE-specific search space. Therefore, the UE must monitor the common search space of the PDCCH 201 to receive system information.

EPDCCH 202 carries demodulation reference signals (demodulation reference signal, DMRS) 205. The eNB may perform precoding on EPDCCH 202 and use UE-specific beamforming. The UE may decode the EPDCCH 202 without informing precoding for the EPDCCH 202. The EPDCCH 202 is configured with the same DMRS pattern as that used for the PDSCH 203. However, unlike PDSCH 203, DMRS205 may support up to 4 antenna ports in EPDCCH 202. DMRS205 may be transmitted only in the PRBs to which EPDCCH 202 is mapped.

The port configuration information of DMRS205 varies depending on EPDCCH transmission mode. In the local transmission mode, an antenna port corresponding to ECCE to which the EPDCCH 202 is mapped is selected based on the UE ID. In the case where multiple UEs share the same ECCE (i.e., multi-user MIMO is used for transmission), the DMRS antenna ports may be allocated to the respective UEs. DMRS205 may also be transmitted in a shared manner, and in this case, UEs may be distinguished using DMRS scrambling sequences configured through higher layer signaling. In a distributed transmission mode, up to two antenna ports may be supported for DMRS205 and precoder cycling based diversity schemes. DMRSs 205 mapped to REs within the same PRB pair may be shared.

Hereinabove, the DL control channel transmission method and the RS for decoding the DL control channel in the conventional LTE and LTE-a have been described.

Hereinafter, a DL control channel for 5G communication, which is currently discussed, is described with reference to the accompanying drawings.

Fig. 3 is a diagram showing a basic unit of time and frequency resources of a DL control channel in a 5G system.

Referring to fig. 3, REGs, which are basic units of time and frequency resources of a control channel, are composed of one OFDM symbol 301 in the time domain and 12 subcarriers 302 (i.e., one RB) in the frequency domain. By assuming one OFDM symbol as a basic unit of control channel resources in the time domain, data and control channels can be multiplexed in one subframe. The control channel is followed by a data channel to reduce processing time at the UE to help meet delay requirements. Multiplexing control and data channels over frequency may be facilitated by using 1 RB 302 as a base unit of control channel resources in the frequency domain.

By concatenating the plurality of NR-REGs 303, various control channel regions of different sizes can be configured. For example, assume that in 5G, the basic unit of DL control channel resource allocation is NR-CCE 304, and NR-CCE 304 may be composed of multiple NR-REGs 303. For example, NR-REG 303 depicted in FIG. 3 consists of 12 REs, and assuming that one NR-CCE 304 consists of 4 NR-REGs 303, then NR-CCE 304 consists of 48 REs. If a DL control region is configured, the control region may be composed of a plurality of NR-CCEs 304, and a certain DL control channel may be mapped to one or more NR-CCEs 304 according to AL in the control region. NR-CCEs 304 constituting the control region are distinguished by CCE numbers allocated in a logical mapping manner.

The basic unit of DL control channel resources (i.e., NR-REG 303) may include REs to which DCI is mapped and REs to which DMRS 305, which is a reference signal for decoding DCI, is mapped. Here, the DMRS 305 may be mapped based on overhead caused by RS resource allocation in order to efficiently transmit. For example, if the DL control channel is transmitted over multiple OFDM symbols, the DMRS 305 may only map to the first OFDM symbol.

DMRS 305 may be mapped based on the number of antenna ports used to transmit DL control channels. Fig. 3 depicts the case of using two antenna ports. DMRS 306 for antenna port #0 and DMRS 307 for antenna port #1 may be transmitted separately. DMRSs for different antenna ports may be multiplexed in various ways. Fig. 3 depicts a case where DMRSs for different antenna ports are mapped to different REs to maintain orthogonality. The DMRS may be frequency-division-multiplexed (FDM) or code-division-multiplexed (CDM) as shown in fig. 3. The DMRS may be configured in various DMRS patterns associated with the number of antenna ports.

Fig. 4 is a diagram for explaining CORESET for transmitting a DL control channel in a 5G wireless communication system according to an embodiment.

Referring to fig. 4, a resource grid is provided that spans a system bandwidth 410 in the frequency domain and one slot 420 in the time domain. Although fig. 4 is directed to the case where one slot is composed of seven OFDM symbols, the method of the present disclosure is also applicable to the case where one slot is composed of fourteen OFDM symbols. In fig. 4, the system bandwidth 410 may include one or more BWP and be divided into 4 bwp_bwp_1402, bwp_bwp_2403, bwp_bwp_3404 and bwp_4405. At least two of the BWP species may be combined into another BWP, such as BWP #5 406.

In fig. 4, two CORESETs (CORESET #1440 and CORESET #2 450) are configured. CORESETs 440 and 450 may be configured to occupy specific subbands across the entire system bandwidth 410. In fig. 4, CORESET #1440 is configured across two BWP (i.e., BWP #1402 and BWP # 2403), and CORESET #2 is configured with one BWP (i.e., BWP #4 405). CORESET may span one or more OFDM symbols in the time domain and its length is specified by a plurality of OFDM symbols, as represented by reference numerals 460 and 470. In fig. 4, CORESET length 460 of CORESET #1 is 2 and CORESET length 470 of CORESET #2 is 1.

In a 5G system, a plurality of CORESETs may be configured according to BSs. The plurality of CORESETs may also be configured according to a terminal (hereinafter, interchangeably referred to as UE). Part of the CORESET configured in the system may also be allocated. Thus, the UE may not be aware of all CORESETs configured in the system. As shown in fig. 4, assuming that two CORESETs (CORESET #1440 and CORESET # 2450) can be configured in the system, CORESET #1440 can be configured for UE #1 and CORESET #1440 and CORESET #2 can be configured for UE #2. In this case, ue#1 may not be aware of the presence of coreset#2450 unless an additional indicator is used.

In 5G, CORESET may be configured as one of a common CORESET, a UE group common CORESET, and a UE-specific CORESET. CORESET may be configured for each UE via UE-specific signaling, UE group common signaling, or RRC signaling. If CORESET is configured to the UE, this means that information about CORESET location, CORESET subband, CORESET resource allocation, and CORESET length is provided to the UE. The CORESET configuration information provided to the UE may include the following information as shown in table 1 below.

[ Table 1 ]

In addition to the above information, CORESET configuration information may include other information required to transmit a DL control channel.

Fig. 5 is a diagram illustrating a PUCCH format used in a 5G wireless communication system according to an embodiment.

Although fig. 5 is directed to the case where the UE determines a transmission period (or start and end symbol positions, or start symbol position and the number of symbols for transmission) of a long PUCCH for transmitting PUCCH on a slot basis, the UE may also determine a transmission period of a long PUCCH for transmitting PUCCH on a micro slot (mini-slot) basis (composed of symbols less than one slot). In the present disclosure, a PUCCH having a short transmission period (e.g., one or two symbols) for minimizing a transmission delay is referred to as a short PUCCH, and a PUCCH having a long transmission period (e.g., 4 or more symbols) for ensuring sufficient cell coverage is referred to as a long PUCCH.

In fig. 5, as denoted by reference numeral 500, the long PUCCH and the short PUCCH are FDM, and as denoted by reference numeral 501, the long PUCCH and the short PUCCH are TDM. A description of slot formats for multiplexing long PUCCH and short PUCCH is provided. Although described with time slots as the basic unit of signal transmission, different units, such as subframes and TTIs, may also be used.

In fig. 5, reference numerals 530 and 531 denote slots, each of which is mainly composed of UL symbols (i.e., UL-centered slots). UL-centric time slots consist mainly of UL OFDM symbols. The OFDM symbols constituting one UL-centered slot may be all UL OFDM symbols or mainly UL OFDM symbols and several DL OFDM symbols located at the beginning or end of the slot with a guard interval (or gap) between DL and UL OFDM symbols. In fig. 5, the UL-centered slot includes one DL OFDM symbol (i.e., a first OFDM symbol) and a plurality of UL OFDM symbols (i.e., third to last OFDM symbols). The second OFDM symbol is used as a guard interval. Uplink transmission (UL) data channel transmission and uplink transmission (UL) control channel transmission may be performed during a period corresponding to UL OFDM symbols.

The long PUCCH 503 may be a long control channel transmitted in a discrete fourier transform spread OFDM (DFT-S-OFDM) scheme as a single carrier transmission scheme instead of the OFDM transmission scheme because the long control channel is used to spread cell coverage. Therefore, it is necessary to transmit a control channel on consecutive subcarriers, and in order to achieve a frequency diversity effect, the long PUCCH 503 should be arranged at discrete positions denoted by reference numerals 508 and 509. The frequency distance 505 should be less than or equal to the UL bandwidth supported by or configured to the UE, which performs long PUCCH 503 transmission in PRB-1 at the beginning of the slot as denoted by reference numeral 508 and in PRB-2 at the end of the slot as denoted by reference numeral 509. A PRB is the smallest transmission unit in the frequency domain and consists of 12 subcarriers. Thus, the distance between PRB-1 and PRB-2 should be less than or equal to the maximum supportable bandwidth of the UE or the UL transmission bandwidth configured to the UE, and the maximum supportable bandwidth of the UE may be less than or equal to the system supported bandwidth 506.

The frequency resources PRB-1 and PRB-2 may be configured to the UE such that the frequency resources are mapped to corresponding bit fields via higher layer signaling and the bit fields included in the DL control channel are used to inform the UE of the frequency resources to be used. Both the control channel, denoted by reference numeral 508, transmitted at the beginning of the slot and the control channel, denoted by reference numeral 509, transmitted at the end of the slot, include UL control information (UL control information, UCI) 510 and a UE-specific reference signal 511, and it is assumed that these two signals are distinguished from each other in appearance (visual) and transmitted in different OFDM symbols.

Short PUCCH 518 may be transmitted in any one of a DL-centric slot and a UL-centric slot, particularly the last symbol or OFDM symbol (e.g., the last OFDM symbol, the penultimate OFDM symbol, or the last two OFDM symbols) at the end of the slot. It is also possible to transmit the short PUCCH 518 at any position in the slot. Short PUCCH 518 may be mapped to one or more OFDM symbols. For example, in fig. 5, short PUCCH 518 is mapped to the last symbol of a slot.

The radio resources of the short PUCCH 518 are allocated by PRB such that the PUCCH is mapped to a plurality of PRBs that are continuous or discrete in the frequency domain. The allocated PRBs should be included in a frequency band equal to or narrower than the frequency band 507 supported by the UE or in UL transmission bandwidth that the BS has configured to the UE. The frequency resources configured to the UE may be allocated to the plurality of PRBs via higher layer signaling such that the frequency resources are mapped to corresponding bit fields, and the plurality of PRBs may inform the UE of the frequency resources to be used via the bit fields included in the DL control channel.

UCI 520 and DMRS 521 are frequency multiplexed at the PRB such that DMRS 521 is transmitted on one subcarrier every two subcarriers as indicated by reference numeral 512, every three subcarriers as indicated by reference numeral 513, or every four subcarriers as indicated by reference numeral 514. One of the DMRS 521 transmission schemes 512, 513, and 514 may be configured via higher layer signaling. The UE may transmit DMRS 521 and DCI multiplexed as indicated via higher layer signaling.

The DMRS transmission scheme may also be determined based on the number of bits of UCI 520. If the number of bits of UCI 520 is small, the UE may multiplex DMRS 521 and UCI 520 into a control channel as indicated by reference numeral 512. In the case where the number of bits of UCI is small, the transmission coding rate may be achieved with reduced resources sufficient for UCI 520 transmission. If the number of bits of UCI 520 is large, the UE may multiplex DMRS 521 and UCI 520 into a control channel as denoted by reference numeral 514. In case that the number of bits of UCI 520 is large, it is necessary to use a large amount of resources for UCI 520 transmission at a reduced transmission coding rate.

Based on information received from the BS via higher layer signaling indicating the use of the long PUCCH or the short PUCCH, the UE may determine to transmit UCI 520 using long PUCCH 503 or short PUCCH 518 in the slot or micro slot. Such determination may also be made based on information received from the BS via physical layer signaling indicating the use of the long PUCCH or the short PUCCH. Such a determination may also be made based on information implicitly obtained from the number of UL symbols of the slot or minislot. For example, the UE may transmit UCI 520 using short PUCCH 518 for the case where the number of UL symbols included in a slot or a micro slot for UCI 520 transmission notified or configured by the BS is 1 or 2, and may transmit UCI 520 using long PUCCH 503 for the case where the number of UL symbols included in a slot or a micro slot is 4 to 14.

Based on information indicating the waveform of message 3 (msg 3) included in message 2 (msg 2) transmitted in the random access procedure, the UE may also determine whether to transmit UCI 520 in a slot or a micro slot using long PUCCH 503 or short PUCCH 518. That is, if information indicating the waveform of msg3 included in msg2 is set to CP-OFMD, the UE transmits UCI 520 with short PUCCH 518 using the CP-OFDM waveform. If information indicating a waveform of msg3 included in msg2 is set to DFT-S-OFDM, the UE transmits UCI 520 with a long PUCCH 503 using the DFT-S-OFDM waveform.

Next, an example of multiplexing the long PUCCH and the short PUCCH described above is provided. The long PUCCH and short PUCCH frequencies of different UEs may be multiplexed into one slot 530 as indicated by reference numeral 500. In this case, as shown in fig. 5, the BS may configure short PUCCH and long PUCCH frequency resources that are not overlapped in one PRB. However, if configuring different PUCCH transmission resources for all individual UEs results in frequency resources being wasted and limited, the frequency resources need to be allocated in large amounts for UL data channel transmission, not UL control channel transmission. Accordingly, the short PUCCH and long PUCCH resources allocated for different UEs may overlap, and the BS may prevent the scheduled resources and the UE-specific transmission resources from colliding with each other in one slot. However, for the case where it is impossible to avoid collision between the short PUCCH transmission resource and the long PUCCH transmission resource, a method is required that enables the BS to configure the long transmission resource and the short transmission resource so that they do not collide and the UE adjusts the long PUCCH 503 transmission resource according to an instruction from the BS. According to one method, short PUCCH and long PUCCH transmission resources may be time division multiplexed in one slot 531.

In order to support various types of services in 5G wireless communication systems, it is necessary to design a system based on forward compatibility so that future services are not limited by the current system. This means that the 5G system should be designed such that time and frequency resources are more flexibly utilized compared to the conventional LTE system. In particular, one of the most important design issues is to ensure the flexibility of the control channel. To achieve this, it may be necessary to transmit DL control channels in a specific sub-band instead of across the entire system band and allocate time and frequency resources for DL control channel transmission in a UE-specific manner.

In 5G systems, it is being considered to transmit and receive signals within an ultra-wide bandwidth of tens or hundreds of MHz or a small amount of GHz to support ultra-high speed data services requiring data rates of several Gbps. However, considering that power consumption increases in proportion to transmission/reception bandwidth, it is necessary to efficiently manage power consumption of the UE and the BS by adapting the transmission/reception bandwidth to this situation. Controlling power consumption is more important in battery-powered UEs than in BSs connected to a constant power supply. Therefore, when the UE does not need ultra-high bandwidth signal transmission/reception, BS switching can be considered and the transmission/reception band of the UE is switched to a narrowband to reduce power consumption.

For transmit/receive bandwidth adaptation or handover, it is necessary for the BS to efficiently configure CORESET to the UE to efficiently transmit DL control channels and resources, as well as PUCCH. In case of allocating UL bandwidth and DL bandwidth in different BWP to the UE, a method is required to enable the UE to configure PUCCH resources in a BWP-specific manner, select PUCCH resources, and switch between BWPs.

Fig. 6 is a diagram illustrating a method for configuring a PUCCH format and a resource region in a 5G wireless communication system according to an embodiment.

Fig. 6 depicts a resource grid spanning UL system bandwidth 610 in the frequency domain and one slot 620 in the time domain. Although fig. 6 is directed to the case where one slot is composed of seven OFDM symbols, the method of the present disclosure is also applicable to the case where one slot is composed of fourteen OFDM symbols. In fig. 6, UL system bandwidth 610 may be composed of one or more UL BWP, and UL system bandwidth 610 is divided into 4 bwp_bwp#1 602, bwp#2 603, bwp#3 604, and bwp#4 605. At least two of the BWP may be combined into another BWP, such as BWP #5 606. The UE may activate one or more BWP for a certain period of time (symbol, slot, subframe or frame). The BWP may be activated or deactivated via at least one of higher layer signaling, DCI transmitted in a DL control channel, MAC CE, and BWP activation/deactivation timer.

Here, PUCCH transmission resources may be configured for all, one, or some of BWP. PUCCH transmission resources may be configured for each UE via UE-specific signaling, UE group common signaling, or RRC signaling. If the PUCCH transmission resource is configured to the UE, information such as a control channel transmission region position, a control channel sub-band, a control channel resource allocation, and a control channel length is provided to the UE. The PUCCH configuration information may include at least the following information as shown in table 2 below.

[ Table 2 ]

A more detailed description is made with reference to parts (a) and (b) of fig. 6. The UE configured with the plurality of BWP as shown in part (a) of fig. 6 may be allocated a plurality of long PUCCH transmission resources 640 in one of the configured BWP. It is also possible that each of PUCCH transmission resources 650, 660, 670 and 680 is allocated to the UE, respectively, in one of the configured BWPs, as shown in part (b) of fig. 6. It is also possible to allocate PUCCH transmission resources for the UE in some of the configured BWP. Here, PUCCH transmission resources may be independently configured per BWP.

The BS may configure PUCCH transmission resources based on the maximum frequency bandwidth supported by the UE without considering BWP. For example, the BS may configure PUCCH transmission resources 650 and 680 based on the maximum UL frequency bandwidth 610 of the UE. In this case, the UE may employ a long PUCCH 650 in bwp#1 602, a short PUCCH 680 in bwp#4, and no PUCCH in bwp#2 603 and bwp#3 604 based on the PUCCH transmission resource and UL bandwidth configured by the BS. Although each BWP is configured to have one type of PUCCH or not as shown in fig. 6, each BWP may be configured to have one or more types of PUCCHs.

At least one information element included in the PUCCH configuration information listed in table 2 may be predefined between the BS and the UE or configured via higher layer signaling or system information (e.g., a signal transmitted together with the SI-RNTI signal) from the BS to the UE. The BS may transmit PUCCH configuration information to the UE via higher layer signaling for UL BWP configuration. In case of configuring the maximum UL bandwidth supported by the UE and PUCCH transmission resources in at least one BWP, the BS may select one of a plurality of control channel transmission resources (or PUCCH format index or PUCCH format) and transmit the selected control channel transmission resource information to the UE via the DL control channel. In this case, the UE may receive a DL data channel based on DCI received on the DL control channel and transmit an acknowledgement corresponding to the DL data channel to the BS on control channel resources indicated via the DCI.

If the UE has to transmit the PUCCH, the UE may activate one of the deactivated BWP (e.g., one of the deactivated BWP (bwp#1 602) in case the activated BWP (bwp#2 603) has no configured PUCCH resource) to transmit the PUCCH. If the UE can activate only one UL BWP, it can assume that BWP (bwp#2 603) which is activated but has no currently configured PUCCH resource is deactivated and BWP (bwp#1 602) is activated for PUCCH transmission. After transmitting the PUCCH, the UE may reactivate bwp#2 603 and deactivate bwp#1 602.

In the case where UL transmissions (e.g., SRS transmissions) are scheduled in BWP #2 603 or another BWP (e.g., BWP #3 604) during a slot in which BWP #1 is activated for PUCCH transmission, UL transmissions scheduled in BWP other than BWP #1 activated for PUCCH transmission may be skipped. At this time, the UE considers whether the PUCCH transmission timing in bwp#1 602 and the UL signal transmission timing scheduled in bwp#3 603 overlap (e.g., at a symbol or slot level), whether BWP handover can be performed, and whether UL transmission scheduled in bwp#3604 can be performed after the PUCCH is transmitted in bwp#1. That is, if UL transmission can be performed in bwp#3604 at a timing (e.g., a symbol or a slot) after a period X from the PUCCH transmission in bwp#1, the UE can activate bwp#3604 to transmit the UL transmission scheduled in bwp#3604 after the PUCCH transmission in bwp#1.

In case that the UE needs to transmit the UL signal on the PUCCH, it may consider a case that there are a plurality of deactivated BWP having configured PUCCH resources even though the currently activated BWP has no configured PUCCH resources, and the plurality of BWP are activated or all or some of the continuously activated BWP have configured PUCCH resources. In this case, the UE may transmit the PUCCH on PUCCH resources configured in a predefined or preconfigured BWP or on PUCCH resources configured in a BWP having the lowest BWP index among activated bwtps having the configured PUCCH resources. The UE may also transmit the PUCCH on PUCCH resources configured in UL BWP (the UL BWP is related to DL BWP on which a DL data channel is received among activated BWP having the configured PUCCH resources) or on PUCCH or UL data channel configured in UL BWP in which another UL signal transmission (not PUCCH transmission) is scheduled. The UE may also transmit PUCCH on PUCCH resources configured in the recently activated UL BWP and if the PUCCH carries scheduling request (scheduling request, SR) information, transmit PUCCH on PUCCH resources configured in UL BWP where resources used by the UE in transmitting the SR are configured.

Hereinafter, a bandwidth adaptation method of the 5G communication system is described.

Fig. 7 is a diagram showing a transmission/reception bandwidth adaptation operation according to an embodiment. The bandwidth adaptation method makes it possible to efficiently manage power consumption of the UE.

Referring to fig. 7, the x-axis is time and the y-axis is frequency. Referring to part (a) of fig. 7 for explaining the DL bandwidth adaptation operation, the UE receives DL control channels and DL data channels corresponding to the bandwidth a 701 from the BS in the slot #1 706. The bandwidth a 701 may be a predetermined reference bandwidth, a bandwidth determined during initial access of the UE, or a bandwidth or BWP determined through configuration signaling between the UE and the BS.

If the BS transmits a bandwidth adaptation indicator 702 to the UE to switch the bandwidth using the bandwidth B705, the UE performs a bandwidth adaptation operation based on the command. Bandwidth a and bandwidth B may be different in size (i.e., bandwidth a may be wider or narrower than bandwidth B). In fig. 7, it is assumed that bandwidth B is wider than bandwidth a. Each of the bandwidths a and B may be expressed by the number of PRBs or BWP.

The UE needs a certain amount of time to successfully perform decoding to obtain the bandwidth adaptation indicator and configures a Radio Frequency (RF) module of the UE for bandwidth switching. In fig. 7, the UE spends a bandwidth transition time X receiving the bandwidth adaptation indicator and completing the bandwidth handover based on the command. The bandwidth adaptation indicator 702 may be carried in a DL control channel 717 that is transmitted to the UE, and the UE receives neither any other DL signals nor transmits any UL signals during the bandwidth transition time X703.

The UE completes the bandwidth switch within the bandwidth transition time X and operates with slot #3 708 in bandwidth B. Thus, the BS may signal the UE in bandwidth B starting from slot #3 708. In fig. 7, the BS may transmit DL control channels and DL data channels corresponding to the bandwidth B in the slot #3 708 and the slot #4 709.

The bandwidth adaptation indicator 702 has a bit width of 1 to N (N > 1).

Bandwidth adaptation indicator configuration scheme 1 (1 bit) if there are two bandwidths available to the UE (e.g., bandwidth a and bandwidth B), a 1 bit indicator may be used to indicate the bandwidth of the UE. For example, for bandwidth a, a 1-bit indicator may be set to 0; or for bandwidth B, the 1-bit indicator may be set to 1.

Bandwidth adaptation indicator configuration scheme 2 (N bits) one of 2N bandwidths available to the UE may be indicated with an N bit indicator. For example, for bandwidth a, the 2-bit indicator may be set to 00; for bandwidth B, the 2-bit indicator may be set to 01; for bandwidth C, the 2-bit indicator may be set to 10; or for bandwidth D, the 2-bit indicator may be set to 11.

The BS may transmit the bandwidth adaptation indicator 702 to the UE via at least one of physical layer signaling, MAC layer signaling, and RRC layer signaling. Physical layer signaling is characterized by the ability of the UE to process the bandwidth adaptation indicator quickly. The BS may transmit the bandwidth adaptation indicator in a UE-specific signaling manner or a UE group common signaling manner in the cell.

In the case where DL and UL signals are transmitted/received in the same frequency band as a Time Division Duplex (TDD) system, if DL BWP and UL BWP are related or associated with each other (e.g., a change from bandwidth a to bandwidth B in DL results in a change in UL from bandwidth a to bandwidth B, and an activation of bandwidth B in DL results in an activation of bandwidth B in UL), UL bandwidth may be switched according to DL bandwidth switching, as shown in part (B) of fig. 7. That is, if the DL bandwidth is changed or switched from bandwidth a 701 to bandwidth B705 as indicated by the bandwidth adaptation indicator 702 transmitted from the BS to the UE, the UL bandwidth is also changed or switched from bandwidth a751 to bandwidth B755.

As shown in part (B) of fig. 7, each of bandwidths configured to the UE is considered to have PUCCH transmission resources (i.e., bandwidth a751 having PUCCH transmission resource 760 and bandwidth B755 having PUCCH transmission resource 770). If the UE receives DCI in slot #1 706, which is transmitted in DL control channel 714 transmitted by the BS, the UE may receive DL data on DL data channel 720 indicated by the DCI and transmit a reception acknowledgement (HARQ ACK (ACK)) corresponding to the DL data to the BS on PUCCH resources at timing as indicated via the DCI (e.g., slot #3 708). Here, as indicated via DCI, the UE locates PUCCH resources within the bandwidth of the timing of receiving the DCI (i.e., PUCCH resource 760 of UL bandwidth a751 activated at the timing of receiving the DCI (slot #1 706), and should transmit HARQ ACK corresponding to DL data 720 in bandwidth B755 at the timing (slot # 3) on PUCCH, so that the BS can assume that the UE transmits HARQ ACK on PUCCH resource 770 in UL bandwidth B755. In this case, the BS may not successfully receive the HARQ ACK corresponding to the DL data 720. Therefore, in the case where UL bandwidth varies with variation of DL bandwidth, a method is required for the UE and the BS to accurately determine UL bandwidth switching timing or PUCCH transmission resources. The following two methods are disclosed.

Method 1 determines a PUCCH transmission resource based on a UL bandwidth activated at or a predetermined time K before a PUCCH transmission start time.

Method 2 changes the corresponding UL bandwidth at the timing (symbol or slot) of transmitting the HARQ ACK corresponding to DL data received in the DL bandwidth changed upon receiving the bandwidth adaptation indicator.

Method 1 is described in more detail with reference to fig. 7.

In the case where DL and UL signals are transmitted/received in the same frequency band (or DL and UL frequency bands have the same center frequency), as in a TDD system, or DL and UL BWP are related or associated with each other (e.g., a change from bandwidth a to bandwidth B in DL results in a change from bandwidth a to bandwidth B in UL, and activation of bandwidth B in DL results in activation of bandwidth B in UL), UL bandwidth may change according to the change in DL bandwidth.

That is, if DL bandwidth a 701 is adjusted or changed to DL bandwidth B705, as indicated by the bandwidth adaptation indicator 702 transmitted from the BS to the UE. Further, the UL bandwidth a 751 may also be changed to the UL bandwidth B755, and in this case, the UL bandwidth switching timing (symbol or slot) may be the same as the DL bandwidth switching timing. The UL bandwidth switch timing (symbol or symbol) may occur after a time X from the DL bandwidth switch timing, where X may be equal to or less in length than the symbol or slot. The value of X may be determined based on UE capabilities or predefined between the BS and the UE. The value of X may be configured to the UE via higher layer signaling or system information (e.g., a signal transmitted with SI-RNTI) from the BS. The BS may transmit higher layer signaling including a value of X for configuring UL BWP to the UE.

In the case where the UL bandwidth configured to the UE has PUCCH transmission resources (i.e., bandwidth a 751 and bandwidth B755 have PUCCH transmission resources 760 and 770, respectively, as shown in part (B) of fig. 7), upon receiving DCI transmitted in DL control channel 714 transmitted by the BS in slot #1 706, the UE may receive DL data on DL data channel 720 indicated via the DCI and transmit HARQ ACK corresponding to the DL data to the BS on the PUCCH resource indicated via the DCI at timing indicated via the DCI (e.g., slot #3 708). In this case, according to method 1, the bs can assume that the UE transmits HARQ ACK on PUCCH resources of a bandwidth that should carry the timing (slot #3 708) of HARQ ACK corresponding to DL data 720, so that HARQ ACK corresponding to DL data 720 can be successfully received.

PUCCH resources may also be configured for UL bandwidths a and B of the UE, respectively.

Fig. 8 is a diagram showing a transmission/reception bandwidth adaptation operation according to an embodiment.

Referring to fig. 8, UL bandwidths (i.e., UL bandwidth a802 and UL bandwidth B803) allocated to the UE constituting the UL system bandwidth may be configured with corresponding PUCCH resources. For example, the UE may be configured with PUCCH #1 810 and PUCCH #2 820 in bandwidth a802 and PUCCH #1 830 and PUCCH #2 840 in bandwidth B803. The UE may receive configuration values, such as PUCCH format, length, and frequency resource location for each bandwidth, respectively. Bandwidth a802 and bandwidth B803 are independently configured with configuration values of different PUCCH formats, lengths, and frequency resource positions.

Assuming that the UE transmits HARQ ACK on PUCCH 770 within a bandwidth activated at a timing (slot #3 708) at which HARQ ACK corresponding to DL data 720 is scheduled as indicated via DCI 714 according to method 1, it may be determined that PUCCH transmission timing and resources (or PUCCH format index or PUCCH format) indicated via DCI 714 are PUCCH transmission timing and resources (or PUCCH format index or PUCCH format) in a bandwidth activated at a timing (slot #3 708) at which HARQ ACK corresponding to DL data 720 is scheduled as indicated via DCI 714, instead of a bandwidth activated at a timing (slot #1 706) at which DCI 714 is received. That is, the UE determines that the PUCCH transmission timing and resource (or PUCCH format index or PUCCH format, for example, PUCCH # 1) indicated via DCI 714 is the PUCCH transmission timing and resource (or PUCCH format index or PUCCH format) of the bandwidth activated at the timing (slot #3 708) indicated via DCI 714 to transmit the HARQ ACK corresponding to DL data 720. In other words, as shown in fig. 8, the UE determines that the PUCCH transmission timing and resource indicated via the DCI 714 is PUCCH #1 830 of bandwidth B803 activated at slot #3, and transmits HARQ ACK corresponding to DL data 720 on PUCCH #1 830.

In case that the configuration of PUCCH transmission resources (or PUCCH format indexes or PUCCH formats) per BWP is different so as not to be mapped one by one (for example, when BWP a is configured with 3 PUCCH resources and BWP B is configured with 2 PUCCH resources), the UE may determine PUCCH transmission timing and resources (or PUCCH format indexes or PUCCH formats, such as PUCCH # 1) through modulo operation. In case that the UE is allocated BWP a configured with 3 PUCCH resources and BWP B is configured with 2 PUCCH resources, if BWP a is activated, it may be assumed that the bandwidth activated at the timing (slot # 3) indicated by the DCI 714 to transmit the HARQ ACK corresponding to the DL data 720 is BWP B. The PUCCH transmission timing and resources (or PUCCH format index or PUCCH format) used by the UE in the PUCCH transmission may be determined based on values obtained by a modulo operation between the PUCCH resources (or PUCCH format index or PUCCH format) indicated through the DCI 714 and the values of the PUCCH resources (or PUCCH format index or PUCCH format) configured in the changed BWP B.

As described above, BWP a is configured with three PUCCH resources (PUCCH #1, PUCCH #2, and PUCCH # 3), and BWP B is configured with two PUCCH resources (PUCCH #1 and PUCCH # 2), however, DCI 714 may indicate that PUCCH #3 is used for PUCCH transmission. In this case, the UE may transmit PUCCH on a PUCCH resource determined to be a result of performing a modulo operation on the indicated control channel resource using a value of the control channel resource (or PUCCH format index or PUCCH format) configured in the changed BWP B (i.e., PUCCH #1 configured in the BWP B).

Method 2 above will be described in more detail with reference to fig. 9.

Fig. 9 is a diagram showing a transmission/reception bandwidth adaptation operation according to an embodiment.

In the case where DL and UL signals are transmitted/received in the same frequency band (or DL and UL frequency bands have the same center frequency), as in a TDD system, or DL and UL BWP are related or associated with each other (e.g., a change from bandwidth a to bandwidth B in DL results in a change from bandwidth a to bandwidth B in UL, and an activation of bandwidth B in DL results in an activation of bandwidth B in UL), UL bandwidth may change according to the change in DL bandwidth, as shown in fig. 9.

That is, referring to fig. 9, if DL bandwidth a 901 is adjusted or changed to DL bandwidth B905 as shown by a bandwidth adaptation indicator 902 transmitted from a BS to a UE, UL bandwidth a 951 may also be changed to UL bandwidth B955, and it may be assumed that UL bandwidth switching timing (symbol or slot) is the same as DL bandwidth switching timing in the above-described method 1. If the assumed UL and DL bandwidth switching timings are identical to each other as in method 1 described with reference to fig. 7, the UE must determine to transmit PUCCH using PUCCH transmission timing and resources (or PUCCH format index or PUCCH format) in a bandwidth activated at a timing (slot #3 708) of transmitting HARQ ACK corresponding to DL data 720 as indicated via DCI 714, instead of a bandwidth activated at a timing (slot #1 706) of receiving DCI 714. Therefore, it may be difficult to ensure a sufficient processing time of the UE between the PUCCH transmission resource determination time and the PUCCH transmission run time.

In method 2, the UE may determine PUCCH transmission resources based on a bandwidth activated at the timing (slot #1 706) of receiving DCI 714 by changing UL bandwidth at the timing (symbol or slot) of transmitting HARQ ACK corresponding to DL data received in the DL bandwidth changed at the time of receiving the bandwidth adaptation indicator. That is, it is assumed that PUCCH transmission resources are configured for the corresponding UL bandwidth allocated to the UE (i.e., bandwidth a 951 and bandwidth B955 are configured with PUCCH resources 960 and 980, respectively, as shown in fig. 9). If the UE receives DCI transmitted by the BS on the DL control channel 914 at slot #1 906, it may receive DL data on the DL data channel 920 indicated via the DCI and transmit HARQ ACK corresponding to the DL data on a PUCCH resource indicated via the DCI 914 among PUCCH resources (PUCCH format index or PUCCH format) configured in UL bandwidth a 951 activated at timing of receiving the DCI (e.g., slot #1 906).

Alternatively, method 2 may be described as causing the UE to perform a bandwidth handover from DL bandwidth a 901 to DL bandwidth B905 according to the bandwidth adaptation indicator 902 transmitted by the BS. The UL bandwidth of the UE may be adjusted or switched from UL bandwidth a 951 to UL bandwidth B955, and in this case, it may be determined that UL bandwidth switching timing (symbol or slot) occurs after time K990 (symbol or slot) after DL bandwidth switching timing. Here, K990 may be greater than or equal to a symbol or slot length and determined based on UE capabilities, or may be a predefined length (symbol or slot) between the BS and the UE. The value of K990 may be configured to the UE via higher layer signaling or system information (e.g., signals transmitted with SI-RNTI) from the BS. The BS may transmit the value of K990 to the UE via higher layer signaling for configuring UL BWP. The value of K990 may also be sent to the UE in a signal carrying the bandwidth adaptation indicator.

Alternatively, if the UE adjusts or switches its DL bandwidth from DL bandwidth a 901 to DL bandwidth B905 based on the bandwidth adaptation indicator received from the BS, the UL bandwidth of the UE may also be adjusted or switched from UL bandwidth a 951 to UL bandwidth B955, and in this case, it may be determined that UL bandwidth switching timing (symbol or slot) occurs at a time before the timing at which HARQ ACK corresponding to DL data transmitted in the changed DL bandwidth is reported or transmitted to the BS on the PUCCH, or at a time X before the corresponding timing. Here, the PUCCH transmitted before switching to UL bandwidth B955 is a PUCCH determined based on UL bandwidth a 951.

Alternatively, if the UE adjusts or switches its DL bandwidth from DL bandwidth a 901 to DL bandwidth B905 based on the bandwidth adaptation indicator received from the BS, the UL bandwidth of the UE may also be adjusted or switched from UL bandwidth a 951 to UL bandwidth B955, and in this case, it may be determined that UL bandwidth switching timing (symbol or slot) occurs at a time before the timing at which HARQ ACK corresponding to DL data transmitted in the changed DL bandwidth is initially reported or transmitted to the BS on the PUCCH, or at a time X before the corresponding timing. Here, the value of X may be less than or equal to a symbol length or a slot length and determined based on UE capability, or may be a predefined symbol or slot length between the BS and the UE. The value of X may be configured to the UE via higher layer signaling or system information (e.g., a signal transmitted with SI-RNTI) from the BS. The BS may transmit the value of X to the UE via higher layer signaling for configuring UL BWP. Here, the PUCCH transmitted before switching to UL bandwidth B955 is a PUCCH determined based on UL bandwidth a 951.

Based on the UL bandwidth switching timing determined through method 2, as described above, the UE may assume that after transmitting the UL bandwidth switching timing using the PUCCH resource (or PUCCH format index or PUCCH format) 980 determined based on the changed bandwidth B955, the PUCCH is configured or indicated to be transmitted together with the bandwidth switching timing, and assume that before transmitting the UL bandwidth switching timing using the PUCCH resource 960 determined based on the UL bandwidth a951, the PUCCH is transmitted.

The UE may obtain configuration information (e.g., PUCCH format, PUCCH length, sequence, frequency hopping, time/frequency resource allocation, and orthogonal sequence information) of PUCCH for transmitting UCI (e.g., SR, DL data channel reception result ((HARQ-ACK) and channel state information (channel state information, CSI)) and determine PUCCH configuration information for transmitting UCI.

Fig. 10 is a diagram showing a transmission/reception bandwidth adaptation operation according to an embodiment.

Fig. 10 depicts a PUCCH case transmitted during slot n in UL BWP 1002 that is a part of UL system bandwidth 100. The UE may receive configuration information about a PUCCH 1010 for transmitting SR information. The UE may be configured with multiple PUCCHs to distinguish among SRs for UL transmissions of data, or logical channels, or groups of logical channels.

Referring to fig. 10, PUCCH #1 1010 includes PUCCH resources for transmitting SR information associated with a first logical channel, and PUCCH #2 1020 includes PUCCH resources for transmitting SR information associated with a second logical channel. If the UE needs to transmit UL data on the first logical channel, the UE may transmit SR information to the BS on PUCCH #1 1010 such that the BS configures or allocates UL data channel transmission resources suitable for a logical channel (first logical channel) in which the UE wants to transmit data.

The UE may also be configured with a PUCCH 1030 for transmitting HARQ ACK corresponding to the DL data channel received at slot n or earlier to the BS. The configuration information of the PUCCH carrying UCI may be configured independently. That is, PUCCH transport formats for PUCCH #1 1010, PUCCH #2 1020, and PUCCH #3 1030 may be independently configured. Accordingly, the PUCCH transmission format may be different among PUCCH #1 1010, PUCCH #2 1020, and PUCCH #3 1030. In addition, the PUCCH transmission lengths or PUCCH transmission duration lengths of PUCCH #1 1010, PUCCH #2 1020, and PUCCH #3 1030 may be independently configured. Accordingly, the PUCCH transmission length or PUCCH transmission duration length may be different among PUCCH #1 1010, PUCCH #2 1020, and PUCCH #3 1030.

The UE may receive a plurality of PUCCH configurations for transmitting HARQ ACK corresponding to DL data received at slot n or earlier to the BS via higher layer signaling. The DCI for scheduling the DL data channel may include an indicator indicating a PUCCH configuration used by the UE when transmitting the HARQ ACK corresponding to the DL data channel among a plurality of PUCCH configurations signaled to the UE. The UE may transmit HARQ ACK using PUCCH resource 1030 as indicated by the indicator.

In case that the UE transmits HARQ ACK corresponding to DL data channel received from the BS at slot n or earlier at slot n, if SR information is also transmitted at slot n (i.e., when a plurality of UCI is transmitted at slot n), the UE may transmit UCI on a corresponding PUCCH or one or more UCI on one of a plurality of PUCCHs. Typically, UCI is preferably transmitted using only one of a plurality of PUCCHs, because transmission power used by a UE when transmitting a signal is limited.

For example, the UE may transmit HARQ ACK corresponding to DL data and SR information on PUCCH #1 1010. Since the BS determines that the UE transmits HARQ ACK corresponding to the DL data channel on PUCCH #3 1030 at slot n, if HARQ ACK corresponding to the DL data channel is received on PUCCH #11010 configured to be used by the UE when transmitting SR information, the BS may determine that the UE has transmitted HARQ ACK corresponding to the DL data channel and SR information of the logical channel corresponding to PUCCH # 11010. In case that slot n transmits SR information of a logical channel corresponding to PUCCH #21020, the UE may transmit HARQ ACK corresponding to a DL data channel on PUCCH #2 1020. If the BS receives HARQ ACK corresponding to the DL data channel on PUCCH #21020 configured to be used by the UE when transmitting SR information, it may be determined that the UE has transmitted HARQ ACK corresponding to the DL data channel and SR information of a logical channel corresponding to PUCCH # 21020.

In this case, UCI may be different in at least one of PUCCH format, PUCCH length (or the number of symbols occupied by PUCCH in time domain), transmission sequence, orthogonal sequence, and cyclic shift. Although it may be assumed that UCI differs in PUCCH length, the method of the present disclosure is also applicable to the case where UCI differs in at least one of PUCCH attributes including PUCCH format, PUCCH sequence, and PUCCH orthogonal sequence.

Fig. 10 depicts PUCCHs with different PUCCH lengths corresponding to UCI. For example, PUCCH #1 1010 carries SR information corresponding to a first logical channel at slot n, PUCCH #21020 carries SR information corresponding to a second logical channel at slot n, and PUCCH #31030 carries HARQ ACK corresponding to a DL data channel at slot n as configured via DCI transmitted by the BS for scheduling DL data. If the SR information corresponding to the first logical channel and the corresponding HARQ ACK corresponding to the DL data are determined to be transmitted simultaneously at the slot n, the UE may transmit both the SR information corresponding to the first logical channel and the corresponding HARQ ACK corresponding to the DL data channel to the BS on the PUCCH #1 1010. However, in this case, configuration information (i.e., PUCCH length) about PUCCH #31030 is different from configuration information about PUCCH #1 1010.

In case that different UCI is simultaneously transmitted or PUCCH transmission resources corresponding to different UCI are overlapped on at least one symbol in the time domain, the UE may transmit UCI on one of PUCCHs corresponding to UCI. If it is necessary to simultaneously transmit both SR information corresponding to the first logical channel and corresponding HARQ ACK corresponding to the DL data channel in the slot n, or if a PUCCH (PUCCH # 1) for transmitting SR information corresponding to the first logical channel and a PUCCH (PUCCH # 3) for transmitting corresponding HARQ ACK corresponding to the DL data channel are overlapped on at least one symbol in the time domain, the UE may transmit HARQ ACK corresponding to the DL data channel and SR information corresponding to the first logical channel (hereinafter referred to as SR 1) on the PUCCH #1 (i.e., both SR1 and HARQ ACK corresponding to the DL data channel are simultaneously transmitted to the BS on the PUCCH # 1).

In this case, if PUCCH #11010 and PUCCH #3 1030 are different in PUCCH length (or the number of PUCCH symbols, n_pucch_symbol), the UE may generate HARQ ACK corresponding to the DL data channel based on the configuration information of PUCCH #1 and transmit the HARQ ACK on the corresponding frequency and time resource (i.e., PUCCH #1 1010). In addition to the bit information to be transmitted on PUCCH #11010 (e.g., in the case where only SR is transmitted, b (0) =0 as the bit information to be transmitted on PUCCH #1 1010), the UE may generate a signal carrying HARQ ACK information using configuration information about PUCCH #11010 and transmit the signal on configured time and frequency resources (i.e., PUCCH #1 1010). That is, the UE may encode bit information of HARQ ACK corresponding to received DL data in a binary phase shift keying (binary phase shift keying, BPSK) or quadrature phase shift keying (quadrature phase shift keying, QPSK) scheme to generate a signal containing information to be transmitted, multiply the signal by a predetermined sequence (e.g., zadoff-Chu sequence), and spread the resulting signal with a quadrature sequence value w_i (m) to generate a signal to be transmitted on PUCCH #1 1010.

That is, compared to the case where only SR1 is transmitted on PUCCH #1 1010, the UE may generate a HARQ ACK signal to be transmitted with the same configuration as that used in the case where only SR1 is transmitted on PUCCH #1 1010 except for transmission information (i.e., HARQ ACK information), and transmit the HARQ ACK signal on the time and frequency resources allocated in PUCCH #1 1010.

The configuration information regarding PUCCH #1 1010 may include all the set values required to generate PUCCH, including: PUCCH length (or number of PUCCH symbols defined as n_pucch_symbol), zadoff-Chu sequence group number, sequence number in the group, hopping configuration, number of symbols of the first and second hopping periods when hopping is activated, or spreading factor of the first and second hopping periods (defined as n_pucch_sf0 and n_pucch_sf1) and orthogonal sequence values therefor, each of which is configured for PUCCH #1 1010.

If PUCCH #1 and PUCCH #3 1030 are the same in PUCCH length (or the number of PUCCH symbols defined as n_pucch_symbol), the UE may generate HARQ ACK corresponding to the DL data channel based on configuration information on PUCCH #3 1030 and transmit the configured time and frequency resources of PUCCH #1 1010. In more detail, the UE may encode HARQ ACK corresponding to received DL data in a BPSK or QPSK scheme to generate a signal, multiply the signal by a predetermined sequence (e.g., zadoff-Chu sequence), and spread the multiplication result with an orthogonal sequence value w_i (m) to generate a spread signal. That is, the UE may generate a HARQ ACK signal to be transmitted with the same configuration value as that used in the case where only the HARQ ACK is transmitted on the PUCCH #3 1030, and transmit the HARQ ACK signal on the time and frequency resources allocated in the PUCCH # 1.

Here, the configuration information about the PUCCH #31030 may include a Zadoff-Chu sequence, a Zadoff-Chu sequence group number, a sequence number in the group, a PUCCH length (or the number of PUCCH symbols defined as n_pucch_symbol), a hopping configuration, the number of symbols of the first and second hopping periods when hopping is activated, or spreading factors of the first and second hopping periods (defined as n_pucch_sf0 and n_pucch_sf1), and orthogonal sequence values therefor, each of which is configured for PUCCH. The configuration information may be received via higher layer signaling and/or DCI, and a configuration value obtained by one or any combination of the higher layer signaling and DCI may be determined as the configuration information according to a rule indicated via the DCI. Therefore, even when PUCCH #1 and PUCCH #31030 are the same in PUCCH length (or the number of PUCCH symbols defined as n_pucch_symbol), the UE may generate HARQ ACK corresponding to the DL data channel based on configuration information on PUCCH #1 1010 and transmit HARQ ACK on time and frequency resources configured for PUCCH #1 1010.

Fig. 11 is a flowchart illustrating UE operation according to an embodiment of the present disclosure. In step 1110, the ue receives BWP configuration information (e.g., information as shown in table 1) and PUCCH configuration information on one or more BWPs as shown in table 2 from the BS via higher layer signaling, a broadcast channel, or a DL data channel including system information (e.g., a DL data channel scheduled via DCI scrambled with SI-RNTI). In step 1120, the UE activates at least one DL and UL BWP based on a BWP adaptation indicator or activation indicator included in DCI transmitted via higher layer signaling or DL control channel. If DL and UL BWP are associated with each other, UL BWP may be changed or activated according to the DL BWP adaptation indicator.

In case that the UE should transmit HARQ ACK, periodic CSI or SRS, or SR corresponding to DL data to the BS, the UE determines whether the currently activated UL BWP has a configured PUCCH in step 1130. If it is determined at 1130 that the currently activated UL BWP has a configured PUCCH, the ue transmits an UL signal on the PUCCH (i.e., in the activated UL BWP configured by the BS or indicated via DCI transmitted by the BS) at step 1150. If it is determined in step 1130 that the currently active UL BWP does not have a configured PUCCH, the ue may activate the BWP with the configured PUCCH and transmit an UL signal on the PUCCH configured in the BWP in step 1140.

Fig. 12 is a flowchart illustrating a UE operation according to an embodiment.

Referring to fig. 12, in step 1210, the ue receives BWP configuration information (e.g., information as shown in table 1) and PUCCH configuration information on one or more BWPs as shown in table 2 from the BS via higher layer signaling, a broadcast channel, or a DL data channel including system information (e.g., a DL data channel scheduled via DCI scrambled with SI-RNTI). In step 1220, the UE activates at least one DL and UL BWP based on a BWP adaptation indicator or activation indicator included in DCI transmitted via higher layer signaling or DL control channel. If DL and UL BWP are related to each other, UL BWP may be changed or activated according to the DL BWP adaptation indicator.

If UL BWP is changed or activated in a related manner according to the DL BWP adaptation indicator, it may be necessary to consider a case in which the UE must transmit HARQ ACK, periodic CSI or SRS, or SR corresponding to DL data received from the BS. In step 1240, the ue may determine UL BWP switching or activation timing according to the aforementioned method 1 or method 2 and determine PUCCH resources (or PUCCH format indexes or PUCCH formats) configured in the activated BWP to transmit UL signals on the corresponding control channel resources in step 1250.

The UE and BS are depicted in fig. 13 and 14, respectively, each consisting of a transmitter, a receiver and a processor for implementing the above method.

Fig. 13 is a block diagram showing a configuration of a UE according to an embodiment.

Referring to fig. 13, the ue may include a processor 1301, a receiver 1302, and a transmitter 1303.

Processor 1301 may control the overall operation of the UE. For example, processor 1301 may control the components differently based on the performed method (i.e., activating UL bandwidth and determining PUSCH transmission operation according to the bandwidth configuration method, the bandwidth adaptation method, and the PUCCH transmission resource configuration method) to perform different operations.

The receiver 1302 and the transmitter 1303 may be collectively referred to as a transceiver. The transceiver may transmit and receive signals to and from the BS. The signals may include control information and data. The transceiver may include an RF transmitter for up-converting and amplifying a signal to be transmitted, and an RF receiver for low noise amplifying and down-converting a received signal. The transceiver may output a signal received through a radio channel to the processor 1301 and transmit the signal output from the processor 1301 through the radio channel.

Fig. 14 is a block diagram showing a configuration of a BS according to an embodiment.

Referring to fig. 14, a bs may include a processor 1401, a receiver 1402, and a transmitter 1403

The processor 1401 may control the overall operation of the BS. For example, the processor 1401 may differently control components based on the performed methods (i.e., a bandwidth configuration method, a bandwidth adaptation method, and a PUCCH transmission resource configuration method).

The receiver 1402 and the transmitter 1403 may be collectively referred to as a transceiver. The transceiver may transmit signals to and receive signals from the terminal. The signals may include control information and data. The transceiver may include an RF transmitter for up-converting and amplifying a signal to be transmitted, and an RF receiver for low noise amplifying and down-converting a received signal. The transceiver may output signals received through the radio channel to the processor 1401 and transmit signals output from the processor 1401 through the radio channel.

As described above, the UL resource configuration method and apparatus of the present disclosure are advantageous in facilitating operation of a 5G system by enabling flexible configuration of UL control and data channel transmission resources.

While the present disclosure has been particularly shown and described with reference to certain embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the following claims and their equivalents.

Claims

1. A method performed by a terminal in a communication system, the method comprising:

receiving configuration information on a plurality of uplink UL bandwidth parts BWP from a base station via higher layer signaling;

receiving downlink control information, DCI, scheduling downlink, DL, data from the base station, wherein the DCI includes physical uplink control channel, PUCCH, transmission timing information, a PUCCH resource indicator and an indicator indicating DL BWP of the DL data;

receiving DL data from the base station on DL BWP based on DCI;

identifying PUCCH transmission timing based on the PUCCH transmission timing information;

identifying PUCCH resources based on a PUCCH configuration and a PUCCH resource indicator, wherein PUCCH resources are configured on UL BWP among the plurality of UL BWP, wherein PUCCH configuration is included in the configuration of UL BWP, and wherein the UL BWP is identified based on an indicator of DL BWP indicating downlink DL data; and

based on the PUCCH resources, hybrid automatic repeat request acknowledgement HARQ-ACK is sent to the base station at PUCCH transmission timing.

2. The method of claim 1, wherein the UL BWP comprising PUCCH resources is an active UL BWP.

3. The method of claim 1, wherein the PUCCH transmission timing is identified based on DCI reception timing and PUCCH transmission timing information.

4. A method performed by a base station in a communication system, the method comprising:

transmitting configuration information regarding a plurality of uplink UL bandwidth parts BWP to a terminal via higher layer signaling;

transmitting downlink control information, DCI, to the terminal, scheduling downlink, DL, data, wherein the DCI includes physical uplink control channel, PUCCH, transmission timing information, a PUCCH resource indicator, and an indicator indicating DL BWP of the DL data;

transmitting DL data to the terminal on DL BWP;

hybrid automatic repeat request acknowledgement HARQ-ACK associated with DL data is received from the terminal on the PUCCH resource,

wherein the PUCCH transmission timing information is used to configure PUCCH transmission timing of the HARQ-ACK,

wherein the PUCCH resource is included in UL BWP among the plurality of UL BWPs,

wherein the PUCCH resource indicator and the PUCCH configuration included in the configuration of UL BWP are used to configure PUCCH resources, and

wherein the UL BWP is associated with an indicator of DL BWP indicating downlink DL data.

5. The method of claim 4, wherein the UL BWP comprising PUCCH resources is an active UL BWP.

6. The method of claim 4, wherein the PUCCH transmission timing information is used to configure PUCCH transmission timing according to the transmission timing of the DCI.

7. A terminal in a communication system, the terminal comprising:

a transceiver; and

a controller coupled with the transceiver and configured to:

receiving DL data from the base station on DL BWP based on DCI;

8. The terminal of claim 7, wherein the UL BWP comprising PUCCH resources is an active UL BWP.

9. The terminal of claim 7, wherein the PUCCH transmission timing is identified based on DCI reception timing and PUCCH transmission timing information.

10. A base station in a communication system, the base station comprising:

a transceiver; and

a controller coupled with the transceiver and configured to:

transmitting DL data to the terminal on DL BWP;

11. The base station of claim 10, wherein the UL BWP comprising PUCCH resources is an active UL BWP.