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Method and apparatus to transmit and receive signal for groupcast in wireless … — Samsung Electronics Co., Ltd. (US11844094B2)

ABSTRACT

Abstract

The disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates than 4G communication systems such as LTE systems. A method performed by a base station in a wireless communication system is provided. The method includes generating a signal including configuration information for at least one bandwidth part (BWP) and transmitting the generated signal. At least part of the at least one BWP may be configured as a resource for multicast.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is based on and claims priority under 35 U.S.C. § 119(a) of a Korean patent application number 10-2020-0099500, filed on Aug. 7, 2020, in the Korean Intellectual Property Office, and of a Korean patent application number 10-2021-0006335, filed on Jan. 15, 2021, in the Korean Intellectual Property Office, the disclosure of each of which is incorporated by reference herein in its entirety.

BACKGROUND

1. Field

The disclosure relates to wireless communication systems. More particularly, the disclosure relates to methods and devices for transmitting/receiving signals for groupcast and/or multicast.

2. Description of Related Art

Wireless communication technologies have been developed mainly for human services, such as voice, multimedia, and data communication. As 5th-generation (5G) communication systems are commercially available, connected devices are expected to explosively increase and to be connected to a communication network. Examples of things connected to a network may include vehicles, robots, drones, home appliances, displays, smart sensors installed in various infrastructures, construction machinery, and factory equipment. Mobile devices will evolve into various form factors, such as augmented reality glasses, virtual reality headsets, and hologram devices. In the 6th-generation (6G) era, efforts are being made to develop an enhanced 6G communication system to provide various services by connecting hundreds of billions of devices and things. For this reason, the 6G communication system is called a beyond 5G system.

In the 6G communication system expected to be realized around year 2030, the maximum transmission rate is tera (i.e., 1000 gigabit) bps, and the wireless latency is 100 microseconds (μsec). In other words, the transmission rate of the 6G communication system is 50 times faster than that of the 5G communication system, and the wireless latency is reduced to one tenth.

To achieve these high data rates and ultra-low latency, 6G communication systems are considered to be implemented in terahertz bands (e.g., 95 gigahertz (95 GHz) to 3 terahertz (3 THz) bands). As the path loss and atmospheric absorption issues worsen in the terahertz band as compared with millimeter wave (mmWave) introduced in 5G, technology that may guarantee signal reach, that is, coverage, would become more important. As major techniques for ensuring coverage, there need to be developed multi-antenna transmission techniques, such as new waveform, beamforming, massive multiple-input and multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antennas, or large-scale antennas, which exhibit better coverage characteristics than radio frequency (RF) devices and orthogonal frequency division multiplexing (OFDM). New technologies, such as a metamaterial-based lens and antennas, high-dimensional spatial multiplexing technology using an orbital angular momentum (OAM), and a reconfigurable intelligent surface (RIS), are being discussed to enhance the coverage of the terahertz band signals.

For 6G communication systems to enhance frequency efficiency and system network for 6G communication systems include full-duplex technology, there are being developed full-duplex technology in which uplink and downlink simultaneously utilize the same frequency resource at the same time, network technology that comprehensively use satellite and high-altitude platform stations (HAPSs), network architecture innovation technology that enables optimization and automation of network operation and supports mobile base stations, dynamic spectrum sharing technology through collision avoidance based on prediction of spectrum usages, artificial intelligence (AI)-based communication technology that uses AI from the stage of designing and internalizes end-to-end AI supporting function to thereby optimize the system, and next-generation distributed computing technology that realizes services that exceed the limitation of the UE computation capability by ultra-high performance communication and mobile edge computing (MEC) or clouds. Further, continuous attempts have been made to reinforce connectivity between device, further optimizing the network, prompting implementation of network entities in software, and increase the openness of wireless communication by the design of a new protocol to be used in 6G communication systems, implementation of a hardware-based security environment, development of a mechanism for safely using data, and development of technology for maintaining privacy.

Such research and development efforts for 6G communication systems would implement the next hyper-connected experience via hyper-connectivity of 6G communication systems which encompass human-thing connections as well as thing-to-thing connections. Specifically, the 6G communication system would be able to provide services, such as truly immersive extended reality (XR), high-fidelity mobile hologram, and digital replica. Further, services, such as remote surgery, industrial automation and emergency response would be provided through the 6G communication system thanks to enhanced security and reliability and would have various applications in medical, auto, or home appliance industries.

The above information is presented as background information only to assist with an understanding of the disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the disclosure.

SUMMARY

In a wireless communication system, a base station may provide a groupcast service and/or a multicast service by transmitting the same data to several UEs. In this case, if a groupcast service and/or a multicast service is provided to each UE through separate data transmission/reception, inefficiency of frequency resources and time resources may result.

Aspects of the disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below Accordingly, an aspect of the disclosure is to provide a method and device for efficiently performing data transmission/reception to provide a groupcast service and/or a multicast service.

Another aspect of the disclosure is to provide a method and device for transmitting and receiving signals for groupcast and/or multicast in a wireless communication system.

Another aspect of the disclosure is to provide a method and device for configuring and operating a bandwidth part for groupcast and/or multicast in a wireless communication system.

Another aspect of the disclosure is to provide a method and device for transmitting and receiving control information and data for groupcast and/or multicast in a wireless communication system.

Another aspect of the disclosure is to provide a method and device for transmitting and receiving signals for groupcast and/or multicast considering carrier aggregation in a wireless communication system.

Another aspect of the disclosure is to provide a method and device for transmitting and receiving signals for groupcast and/or multicast in a wireless communication system.

Another aspect of the disclosure is to provide a method and device for configuring and operating a bandwidth part for groupcast and/or multicast in a wireless communication system.

Another aspect of the disclosure is to provide a method and device for transmitting and receiving control information and data for groupcast and/or multicast in a wireless communication system.

Another aspect of the disclosure is to provide a method and device for transmitting and receiving signals for groupcast and/or multicast considering carrier aggregation in a wireless communication system.

Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments.

In accordance with an aspect of the disclosure, a method performed by a base station in a wireless communication system is provided. The method includes generating a signal including configuration information for at least one bandwidth part (BWP) and transmitting the generated signal. At least part of the at least one BWP may be configured as a resource for multicast.

In accordance with another aspect of the disclosure, a method performed by a terminal in a wireless communication system is provided. The method includes receiving a signal including configuration information for at least one bandwidth part (BWP), identifying the at least one BWP based on the configuration information, and receiving a multicast signal via at least part of the at least one BWP.

In accordance with another aspect of the disclosure, a base station in a wireless communication system is provided. The base station includes a transceiver and at least one processor. The at least one processor may be configured to generate a signal including configuration information for at least one bandwidth part (BWP) and transmit the generated signal via the transceiver. At least part of the at least one BWP may be configured as a resource for multicast.

In accordance with another aspect of the disclosure, a terminal in a wireless communication system is provided. The terminal includes a transceiver and at least one processor. The at least one processor may be configured to receive, via the transceiver, a signal including configuration information for at least one bandwidth part (BWP), identify the at least one BWP based on the configuration information, and receive, via the transceiver, a multicast signal via at least part of the at least one BWP.

In accordance with another aspect of the disclosure, a method performed by a transmitter is provided. The method includes generating a signal including configuration information for groupcast and transmitting the signal including the configuration information for groupcast. The configuration information for groupcast includes information for a bandwidth part (BWP) for groupcast. The BWP for groupcast includes an initial BWP or a BWP different from the initial BWP.

In accordance with another aspect of the disclosure, a method performed by a receiver is provided. The method includes receiving a signal from a transmitter and identifying configuration information for groupcast from the signal. The configuration information for groupcast includes information for a bandwidth part (BWP) for groupcast. The BWP for groupcast includes an initial BWP or a BWP different from the initial BWP.

In accordance with another aspect of the disclosure, a transmitter is provided. The transmitter includes a transceiver configured to transmit and receive a signal and a processor configured to generate a signal including configuration information for groupcast and transmit, through the transceiver, the signal including the configuration information for groupcast. The configuration information for groupcast includes information for a bandwidth part (BWP) for groupcast. The BWP for groupcast includes an initial BWP or a BWP different from the initial BWP.

In accordance with another aspect of the disclosure, a receiver in a wireless communication system is provided. The receiver includes a transceiver configured to receive a signal from a transmitter and a processor configured to identify configuration information for groupcast from the signal. The configuration information for groupcast includes information for a bandwidth part (BWP) for groupcast. The BWP for groupcast includes an initial BWP or a BWP different from the initial BWP.

Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

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

FIG. 1 is a view illustrating a downlink or uplink time-frequency domain transmission structure of a 5G (or new radio (NR)) system according to an embodiment of the disclosure;

FIG. 2 is a view illustrating an example in which eMBB, URLLC, and mMTC data are allocated in frequency-time resources in a communication system according to an embodiment of the disclosure;

FIG. 3 is a view illustrating another example in which eMBB, URLLC, and mMTC data are allocated in frequency-time resources in a communication system according to an embodiment of the disclosure;

FIG. 4 is a view illustrating an example in which one transport block is divided into several code blocks and a CRC is added according to an embodiment of the disclosure;

FIG. 5 is a view illustrating an example of groupcasting in which one terminal transmits common data to a plurality of terminals according to an embodiment of the disclosure;

FIG. 6 is a view illustrating a process in which a plurality of terminals that receive common data in groupcasting transmit information related to data reception success or data reception failure to a terminal that transmits the common data according to an embodiment of the disclosure;

FIG. 7 is a view illustrating a state in which a synchronization signal and a physical broadcast channel of an NR system are mapped in the frequency and time domains according to an embodiment of the disclosure;

FIG. 8 is a view illustrating an example in which one SS/PBCH block is mapped to which symbols in a slot according to an embodiment of the disclosure;

FIG. 9 is a diagram illustrating an example in which an SS/PBCH block may be transmitted in which symbol among symbols within 1 ms according to subcarrier spacing according to an embodiment of the disclosure;

FIG. 10 is a view schematically illustrating an example of a signal transmission/reception scheme for a groupcast service in a wireless communication system according to an embodiment of the disclosure;

FIG. 11 is a view schematically illustrating a structure of a bandwidth part in a wireless communication system according to an embodiment of the disclosure;

FIG. 12 is a view schematically illustrating a structure of a control resource set in a wireless communication system according to an embodiment of the disclosure;

FIG. 13 is a view schematically illustrating a resource structure in a wireless communication system according to an embodiment of the disclosure;

FIG. 14 is a view schematically illustrating a DRX operation in a wireless communication system according to an embodiment of the disclosure;

FIG. 15 is a view schematically illustrating a structure of an example base station according to an embodiment of the disclosure;

FIG. 16 is a view schemat

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is based on and claims priority under 35 U.S.C. § 119(a) of a Korean patent application number 10-2020-0099500, filed on Aug. 7, 2020, in the Korean Intellectual Property Office, and of a Korean patent application number 10-2021-0006335, filed on Jan. 15, 2021, in the Korean Intellectual Property Office, the disclosure of each of which is incorporated by reference herein in its entirety.

BACKGROUND

1. Field

The disclosure relates to wireless communication systems. More particularly, the disclosure relates to methods and devices for transmitting/receiving signals for groupcast and/or multicast.

2. Description of Related Art

Wireless communication technologies have been developed mainly for human services, such as voice, multimedia, and data communication. As 5th-generation (5G) communication systems are commercially available, connected devices are expected to explosively increase and to be connected to a communication network. Examples of things connected to a network may include vehicles, robots, drones, home appliances, displays, smart sensors installed in various infrastructures, construction machinery, and factory equipment. Mobile devices will evolve into various form factors, such as augmented reality glasses, virtual reality headsets, and hologram devices. In the 6th-generation (6G) era, efforts are being made to develop an enhanced 6G communication system to provide various services by connecting hundreds of billions of devices and things. For this reason, the 6G communication system is called a beyond 5G system.

In the 6G communication system expected to be realized around year 2030, the maximum transmission rate is tera (i.e., 1000 gigabit) bps, and the wireless latency is 100 microseconds (μsec). In other words, the transmission rate of the 6G communication system is 50 times faster than that of the 5G communication system, and the wireless latency is reduced to one tenth.

To achieve these high data rates and ultra-low latency, 6G communication systems are considered to be implemented in terahertz bands (e.g., 95 gigahertz (95 GHz) to 3 terahertz (3 THz) bands). As the path loss and atmospheric absorption issues worsen in the terahertz band as compared with millimeter wave (mmWave) introduced in 5G, technology that may guarantee signal reach, that is, coverage, would become more important. As major techniques for ensuring coverage, there need to be developed multi-antenna transmission techniques, such as new waveform, beamforming, massive multiple-input and multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antennas, or large-scale antennas, which exhibit better coverage characteristics than radio frequency (RF) devices and orthogonal frequency division multiplexing (OFDM). New technologies, such as a metamaterial-based lens and antennas, high-dimensional spatial multiplexing technology using an orbital angular momentum (OAM), and a reconfigurable intelligent surface (RIS), are being discussed to enhance the coverage of the terahertz band signals.

For 6G communication systems to enhance frequency efficiency and system network for 6G communication systems include full-duplex technology, there are being developed full-duplex technology in which uplink and downlink simultaneously utilize the same frequency resource at the same time, network technology that comprehensively use satellite and high-altitude platform stations (HAPSs), network architecture innovation technology that enables optimization and automation of network operation and supports mobile base stations, dynamic spectrum sharing technology through collision avoidance based on prediction of spectrum usages, artificial intelligence (AI)-based communication technology that uses AI from the stage of designing and internalizes end-to-end AI supporting function to thereby optimize the system, and next-generation distributed computing technology that realizes services that exceed the limitation of the UE computation capability by ultra-high performance communication and mobile edge computing (MEC) or clouds. Further, continuous attempts have been made to reinforce connectivity between device, further optimizing the network, prompting implementation of network entities in software, and increase the openness of wireless communication by the design of a new protocol to be used in 6G communication systems, implementation of a hardware-based security environment, development of a mechanism for safely using data, and development of technology for maintaining privacy.

Such research and development efforts for 6G communication systems would implement the next hyper-connected experience via hyper-connectivity of 6G communication systems which encompass human-thing connections as well as thing-to-thing connections. Specifically, the 6G communication system would be able to provide services, such as truly immersive extended reality (XR), high-fidelity mobile hologram, and digital replica. Further, services, such as remote surgery, industrial automation and emergency response would be provided through the 6G communication system thanks to enhanced security and reliability and would have various applications in medical, auto, or home appliance industries.

The above information is presented as background information only to assist with an understanding of the disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the disclosure.

SUMMARY

In a wireless communication system, a base station may provide a groupcast service and/or a multicast service by transmitting the same data to several UEs. In this case, if a groupcast service and/or a multicast service is provided to each UE through separate data transmission/reception, inefficiency of frequency resources and time resources may result.

Aspects of the disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below Accordingly, an aspect of the disclosure is to provide a method and device for efficiently performing data transmission/reception to provide a groupcast service and/or a multicast service.

Another aspect of the disclosure is to provide a method and device for transmitting and receiving signals for groupcast and/or multicast in a wireless communication system.

Another aspect of the disclosure is to provide a method and device for configuring and operating a bandwidth part for groupcast and/or multicast in a wireless communication system.

Another aspect of the disclosure is to provide a method and device for transmitting and receiving control information and data for groupcast and/or multicast in a wireless communication system.

Another aspect of the disclosure is to provide a method and device for transmitting and receiving signals for groupcast and/or multicast considering carrier aggregation in a wireless communication system.

Another aspect of the disclosure is to provide a method and device for transmitting and receiving signals for groupcast and/or multicast in a wireless communication system.

Another aspect of the disclosure is to provide a method and device for configuring and operating a bandwidth part for groupcast and/or multicast in a wireless communication system.

Another aspect of the disclosure is to provide a method and device for transmitting and receiving control information and data for groupcast and/or multicast in a wireless communication system.

Another aspect of the disclosure is to provide a method and device for transmitting and receiving signals for groupcast and/or multicast considering carrier aggregation in a wireless communication system.

Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments.

In accordance with an aspect of the disclosure, a method performed by a base station in a wireless communication system is provided. The method includes generating a signal including configuration information for at least one bandwidth part (BWP) and transmitting the generated signal. At least part of the at least one BWP may be configured as a resource for multicast.

In accordance with another aspect of the disclosure, a method performed by a terminal in a wireless communication system is provided. The method includes receiving a signal including configuration information for at least one bandwidth part (BWP), identifying the at least one BWP based on the configuration information, and receiving a multicast signal via at least part of the at least one BWP.

In accordance with another aspect of the disclosure, a base station in a wireless communication system is provided. The base station includes a transceiver and at least one processor. The at least one processor may be configured to generate a signal including configuration information for at least one bandwidth part (BWP) and transmit the generated signal via the transceiver. At least part of the at least one BWP may be configured as a resource for multicast.

In accordance with another aspect of the disclosure, a terminal in a wireless communication system is provided. The terminal includes a transceiver and at least one processor. The at least one processor may be configured to receive, via the transceiver, a signal including configuration information for at least one bandwidth part (BWP), identify the at least one BWP based on the configuration information, and receive, via the transceiver, a multicast signal via at least part of the at least one BWP.

In accordance with another aspect of the disclosure, a method performed by a transmitter is provided. The method includes generating a signal including configuration information for groupcast and transmitting the signal including the configuration information for groupcast. The configuration information for groupcast includes information for a bandwidth part (BWP) for groupcast. The BWP for groupcast includes an initial BWP or a BWP different from the initial BWP.

In accordance with another aspect of the disclosure, a method performed by a receiver is provided. The method includes receiving a signal from a transmitter and identifying configuration information for groupcast from the signal. The configuration information for groupcast includes information for a bandwidth part (BWP) for groupcast. The BWP for groupcast includes an initial BWP or a BWP different from the initial BWP.

In accordance with another aspect of the disclosure, a transmitter is provided. The transmitter includes a transceiver configured to transmit and receive a signal and a processor configured to generate a signal including configuration information for groupcast and transmit, through the transceiver, the signal including the configuration information for groupcast. The configuration information for groupcast includes information for a bandwidth part (BWP) for groupcast. The BWP for groupcast includes an initial BWP or a BWP different from the initial BWP.

In accordance with another aspect of the disclosure, a receiver in a wireless communication system is provided. The receiver includes a transceiver configured to receive a signal from a transmitter and a processor configured to identify configuration information for groupcast from the signal. The configuration information for groupcast includes information for a bandwidth part (BWP) for groupcast. The BWP for groupcast includes an initial BWP or a BWP different from the initial BWP.

Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

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

FIG. 1 is a view illustrating a downlink or uplink time-frequency domain transmission structure of a 5G (or new radio (NR)) system according to an embodiment of the disclosure;

FIG. 2 is a view illustrating an example in which eMBB, URLLC, and mMTC data are allocated in frequency-time resources in a communication system according to an embodiment of the disclosure;

FIG. 3 is a view illustrating another example in which eMBB, URLLC, and mMTC data are allocated in frequency-time resources in a communication system according to an embodiment of the disclosure;

FIG. 4 is a view illustrating an example in which one transport block is divided into several code blocks and a CRC is added according to an embodiment of the disclosure;

FIG. 5 is a view illustrating an example of groupcasting in which one terminal transmits common data to a plurality of terminals according to an embodiment of the disclosure;

FIG. 6 is a view illustrating a process in which a plurality of terminals that receive common data in groupcasting transmit information related to data reception success or data reception failure to a terminal that transmits the common data according to an embodiment of the disclosure;

FIG. 7 is a view illustrating a state in which a synchronization signal and a physical broadcast channel of an NR system are mapped in the frequency and time domains according to an embodiment of the disclosure;

FIG. 8 is a view illustrating an example in which one SS/PBCH block is mapped to which symbols in a slot according to an embodiment of the disclosure;

FIG. 9 is a diagram illustrating an example in which an SS/PBCH block may be transmitted in which symbol among symbols within 1 ms according to subcarrier spacing according to an embodiment of the disclosure;

FIG. 10 is a view schematically illustrating an example of a signal transmission/reception scheme for a groupcast service in a wireless communication system according to an embodiment of the disclosure;

FIG. 11 is a view schematically illustrating a structure of a bandwidth part in a wireless communication system according to an embodiment of the disclosure;

FIG. 12 is a view schematically illustrating a structure of a control resource set in a wireless communication system according to an embodiment of the disclosure;

FIG. 13 is a view schematically illustrating a resource structure in a wireless communication system according to an embodiment of the disclosure;

FIG. 14 is a view schematically illustrating a DRX operation in a wireless communication system according to an embodiment of the disclosure;

FIG. 15 is a view schematically illustrating a structure of an example base station according to an embodiment of the disclosure;

FIG. 16 is a view schematically illustrating a structure of an example UE according to an embodiment of the disclosure;

FIG. 17 is a block diagram schematically illustrating an internal structure of a UE according to an embodiment of the disclosure; and

FIG. 18 is a block diagram schematically illustrating an internal structure of a base station according to an embodiment of the disclosure.

The same reference numerals are used to represent the same elements throughout the drawings.

DETAILED DESCRIPTION

The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the disclosure is provided for illustration purpose only and not for the purpose of limiting the disclosure as defined by the appended claims and their equivalents.

It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a component surface” includes reference to one or more of such surfaces.

New radio (NR) access technology, a new 5G communication technology, is designed to be able to freely multiplex various services in time and frequency resources and, accordingly, waveforms/numerology and reference signals may be allocated dynamically or freely as necessary in services. To provide an optimal service to a terminal (e.g., a user equipment (UE)) in wireless communication, it is critical to provide data transmission optimized via measurement of interference and the quality of channel, and thus, accurate measurement of the channel state is essential. However, unlike 4G communication in which no significant change occurs in channel and interference characteristics depending on frequency resources, 5G channels experience drastic changes in channel and interference characteristics depending on services and thus need support of a subset in light of frequency resource group (FRG) that allows them to be divided and measured. Meanwhile, types of services supported in the NR system may be divided into categories, such as enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable and low-latency communications (URLLC). eMBB, mMTC, and URLLC are services targeting high-rate transmission of high-volume data, minimized UE power consumption and access by multiple UEs, and high reliability and low latency, respectively. Different requirements may be applied depending on types of services applied to the UE.

As such, a plurality of services may be provided to users in the communication system and, to that end, there are required a method for providing the services in the same time interval according to characteristics and a device using the method.

Hereinafter, embodiments of the disclosure are described in detail with reference to the accompanying drawings.

In describing the embodiments, the description of technologies that are known in the art and are not directly related to the disclosure is omitted. This is for further clarifying the gist of the disclosure without making it unclear.

For the same reasons, some elements may be exaggerated or schematically shown. The size of each element does not necessarily reflect the real size of the element. The same reference numeral is used to refer to the same element throughout the drawings.

Advantages and features of the disclosure, and methods for achieving the same may be understood through the embodiments to be described below taken in conjunction with the accompanying drawings. However, the disclosure is not limited to the embodiments disclosed herein, and various changes may be made thereto. The embodiments disclosed herein are provided only to inform one of ordinary skilled in the art of the category of the disclosure. The disclosure is defined only by the appended claims. The same reference numeral denotes the same element throughout the specification.

It should be appreciated that the blocks in each flowchart and combinations of the flowcharts may be performed by computer program instructions. Since the computer program instructions may be equipped in a processor of a general-use computer, a special-use computer or other programmable data processing devices, the instructions executed through a processor of a computer or other programmable data processing devices generate means for performing the functions described in connection with a block(s) of each flowchart. Since the computer program instructions may be stored in a computer-available or computer-readable memory that may be oriented to a computer or other programmable data processing devices to implement a function in a specified manner, the instructions stored in the computer-available or computer-readable memory may produce a product including an instruction means for performing the functions described in connection with a block(s) in each flowchart. Since the computer program instructions may be equipped in a computer or other programmable data processing devices, instructions that generate a process executed by a computer as a series of operational steps are performed over the computer or other programmable data processing devices and operate the computer or other programmable data processing devices may provide steps for executing the functions described in connection with a block(s) in each flowchart.

Further, each block may represent a module, segment, or part of a code including one or more executable instructions for executing a specified logical function(s). Further, it should also be noted that in some replacement execution examples, the functions mentioned in the blocks may occur in different orders. For example, two blocks that are consecutively shown may be performed substantially simultaneously or in a reverse order depending on corresponding functions.

As used herein, the term “unit” means a software element or a hardware element such as a field-programmable gate array (FPGA) or an application specific integrated circuit (ASIC). A unit plays a certain role. However, the term “unit” is not limited as meaning a software or hardware element. A ‘unit’ may be configured in a storage medium that may be addressed or may be configured to reproduce one or more processors. Accordingly, as an example, a ‘unit’ includes elements, such as software elements, object-oriented software elements, class elements, and task elements, processes, functions, attributes, procedures, subroutines, segments of program codes, drivers, firmware, microcodes, circuits, data, databases, data architectures, tables, arrays, and variables. A function provided in an element or a ‘unit’ may be combined with additional elements or may be split into sub elements or sub units. Further, an element or a ‘unit’ may be implemented to reproduce one or more CPUs in a device or a security multimedia card. According to embodiments of the disclosure, a “ . . . unit” may include one or more processors.

Wireless communication systems evolve beyond voice-centered services to broadband wireless communication systems to provide high data rate and high-quality packet data services, such as 3rd generation partnership project (3GPP) high speed packet access (HSPA), long term evolution (LTE) or evolved universal terrestrial radio access (E-UTRA)), LTE-advanced (LTE-A), 3GPP2 high rate packet data (HRPD), ultra-mobile broadband (UMB), and institute of electrical and electronics engineers (IEEE) 802.16e communication standards. Further, for fifth generation (5G) wireless communication systems, 5G or new radio (NR) communication is being standardized.

As a representative broadband wireless communication system, the NR system adopts orthogonal frequency division multiplexing (OFDM) for downlink (DL) and uplink (UL). More specifically, the NR system employs cyclic-prefix OFDM (CP-OFDM) for downlink and two schemes, i.e., CP-OFDM and discrete Fourier transform spreading OFDM (DFT-S-OFDM) for uplink. Uplink means a wireless link where a terminal (e.g., a UE or a mobile station (MS)) transmits data or control signals to the base station (BS, or eNode B), and download means a wireless link where the base station transmits data or control signals to the terminal. Such multiple access scheme allocates and operates time-frequency resources carrying data or control information per user not to overlap, i.e., to maintain orthogonality, to thereby differentiate each user's data or control information. Hereinafter, it will be noted that the term “terminal” will be interchangeable with the term “UE” or “MS”.

The NR system adopts hybrid automatic repeat request (HARQ) scheme that re-transmits corresponding data through the physical layer in case decoding fails at the initial stage of transmission. By the HARQ scheme, if the receiver fails to precisely decode data, the receiver transmits information (negative acknowledgement (NACK)) indicating the decoding failure to the transmitter so that the transmitter may re-transmit the corresponding data through the physical layer. The receiver raises the data reception capability by combining the data re-transmitted by the transmitter with the data for which decoding has failed before. Further, in case the receiver precisely decode data, the receiver may transmit information (acknowledgment (ACK)) indicating decoding succeeds to the transmitter so that the transmitter may transmit new data.

FIG. 1 is a view illustrating a basic structure of time-frequency domain which is radio resource domain where the data or control channel is transmitted on downlink or uplink in the NR system according to an embodiment of the disclosure.

Referring to FIG. 1 , the horizontal axis refers to the time domain, and the vertical axis refers to the frequency domain. The minimum transmission unit in the time domain is the OFDM symbol, and N symb ( 102 ) OFDM symbols together form one slot 106 . The length of the subframe is defined as 1.0 ms, and the radio frame 114 is defined as 10 ms. In the frequency domain, the minimum transmission unit is subcarrier, and the bandwidth of the overall system transmission band consists of a total of N BW ( 104 ) subcarriers. One frame may be defined as 10 ms. One subframe may be defined as 1 ms, and thus, one frame may consist of a total of 10 subframes. One slot may be defined as 14 OFDM symbols (that is, the number (N symb slot ) of symbols per slot=14). One subframe may be composed of one or more slots, and the number of the slots included in one subframe may vary according to μ which is a value set for subcarrier spacing.

FIG. 2 illustrates an example in which the subcarrier spacing is set to μ=0 ( 204 ) and an example in which the subcarrier spacing is set to μ=1 according to an embodiment of the disclosure. When μ=0, one subframe may consist of one slot, and when μ=1, one subframe may consist of two slots. In other words, according to the set subcarrier spacing value μ, the number (N slot subframeμ ) of slots per subframe may vary, and accordingly, the number (N slot frameμ ) of slots per frame may differ. According to each subcarrier spacing μ, N slot subframeμ and may be defined in Table 1 below.

TABLE 1

μ

N symb slot

N slot frameμ

N slot subframeμ

0

14

10

1

1

14

20

2

2

14

40

4

3

14

80

8

4

14

160

16

Before radio resource control (RRC) connected, the UE may be configured with an initial bandwidth part (BWP) for initial access by the base station via a master information block (MIB). More specifically, the UE may receive configuration information for a search space and control resource set (CORESET) in which physical downlink control channel (PDCCH) may be transmitted to receive system information (remaining system information, RMSI or system information block 1 which may correspond to SIB1) necessary for initial access through the MIB in the initial access phase. Each of the control region and search space configured with the MIB may be regarded as identity (ID) 0. The base station may provide the UE with configuration information, such as frequency allocation information, time allocation information, and numerology for control region #

0 , via the MIB. Further, the base station may provide the UE with configuration information for occasion and monitoring period for control region #

0 , i.e., configuration information for search space #

0 , via the MIB. The UE may regard the frequency range set as control region #

0 obtained from the MIB, as the initial BWP for initial access. In this case, the identity (ID) of the initial BWP may be regarded as 0.

The MIB may include contain the following information.

<MIB>

-- ASN1START

-- TAG-MIB-START

MIB ::=

SEQUENCE {

 systemFrameNumber

BIT STRING (SIZE (6)),

 subCarrierSpacingCommon

ENUMERATED {scs15or60, scs30or120},

 ssb-SubcarrierOffset

INTEGER (0..15),

 dmrs-TypeA-Position

ENUMERATED {pos2, pos3},

 pdcch-ConfigSIB1

,

 cellBarred

ENUMERATED {barred, notBarred},

 intraFreqReselection

ENUMERATED {allowed, notAllowed},

 spare

BIT STRING (SIZE (1))

}

-- TAG-MIB-STOP

-- ASN1STOP

MIB field descriptions

 cellBarred

 Value barred means that the cell is barred, as defined in TS 38.304 [20].

 dmrs-TypeA-Position

 Position of (first) DM-RS for downlink (see TS 38.211 [16], clause 7.4.1.1.2)

  and uplink (see TS 38.211 [16], clause 6.4.1.1.3).

 intraFreqReselection

 Controls cell selection/reselection to intra-frequency cells when the highest

  ranked cell is barred, or treated as barred by the UE, as specified in TS

  38.304 [20].

 pdcch-ConfigSIB1

 Determines a common ControlResourceSet (CORESET), a common search

  space and necessary PDCCH parameters. If the field ssb-SubcarrierOffset

  indicates that SIB1 is absent, the field pdcch-ConfigSIB1 indicates the

  frequency positions where the UE may find SS/PBCH block with SIB1 or

  the frequency range where the network does not provide SS/PBCH block

  with SIB1 (see TS 38.213 [13], clause 13).

 ssb-SubcarrierOffset

 Corresponds to kSSB (see TS 38.213 [13]), which is the frequency domain

  offset between SSB and the overall resource block grid in number of

  subcarriers. (See TS 38.211 [16], clause 7.4.3.1).

 The value range of this field may be extended by an additional most

  significant bit encoded within PBCH as specified in TS 38.213 [13].

 This field may indicate that this cell does not provide SIB1 and that there is

  hence no CORESET# 0 configured in MIB (see TS 38.213 [13], clause 13).

  In this case, the field pdcch-ConfigSIB1 may indicate the frequency

  positions where the UE may (not) find a SS/PBCH with a control resource

  set and search space for SIB1 (see TS 38.213 [13], clause 13).

 subCarrierSpacingCommon

 Subcarrier spacing for SIB1, Msg.2/4 for initial access, paging and broadcast

  SI-messages. If the UE acquires this MIB on an FR1 carrier frequency, the

  value scs15or60 corresponds to 15 kHz and the value scs30or120

  corresponds to 30 kHz. If the UE acquires this MIB on an FR2 carrier

  frequency, the value scs15or60 corresponds to 60 kHz and the value

  scs30or120 corresponds to 120 kHz.

 systemFrameNumber

 The 6 most significant bits (MSB) of the 10-bit System Frame Number (SFN).

  The 4 LSB of the SFN are conveyed in the PBCH transport block as part of

  channel coding (i.e. outside the MIB encoding), as defined in clause 7.1 in

  TS 38.212 [17].

In a method for configuring a bandwidth part, UEs before RRC connected may receive configuration information for the initial BWP via MIB in the initial access phase. Specifically, the UE may be configured with a control region for a downlink control channel where downlink control information (DCI) for scheduling SIB may be transmitted from the MIB of the physical broadcast channel (PBCH). In this case, the bandwidth of the configured by the MIB may be regarded as the initial BWP, and the UE may receive the physical downlink shared channel (PDSCH), which transmits the SIB, via the configured initial BWP. The initial BWP may be utilized for other system information (OSI), paging, and random access as well as for receiving SIB.

If the UE is configured with one or more BWPs, the base station may indicate, to the UE, a change in BWP using the BWP indicator in the DCI.

The basic resource units in the time-frequency domains are the resource elements (REs) 112 (RE), and may be represented with the OFDM symbol index and the subcarrier index. The resource block (RB) 108 or physical resource block (PRB) is defined as N

symb 102 contiguous OFDM symbols in the time domain and N RB subcarriers 110 in the frequency domain. Generally, the minimum transmission unit of data is the RB. Generally, in the NR system, N symb =14, N RB =12, and, N BW is proportional to the bandwidth of system transmission band. Data rate may increase in proportion to the number of RBs scheduled for the UE.

In the NR system, in the case of frequency division duplex (FDD) system in which downlink and uplink are distinguished with frequencies, the downlink transmission bandwidth and the uplink transmission bandwidth may differ from each other. The channel bandwidth refers to an RF bandwidth corresponding to the system transmission bandwidth. Tables 2 and 3 show some system transmission bandwidths and the relationship between subcarrier spacing and channel bandwidth defined in NR system, for frequency bands lower than 6 GHz and frequency bands higher than 6 GHz, respectively. For example, in an NR system with a channel bandwidth of 100 MHz and a subcarrier spacing of 30 kHz, the transmission bandwidth is composed of 273 RBs. In the following, N/A may be a bandwidth-subcarrier combination not supported by the NR system.

TABLE 2

Configuration of frequency range 1 (FR1)

5

10

15

20

25

30

40

50

60

80

90

100

SCS

MHz

MHz

MHz

MHz

MHz

MHz

MHz

MHz

MHz

MHz

MHz

MHz

(kHz)

NRB

NRB

NRB

NRB

NRB

NRB

NRB

NRB

NRB

NRB

NRB

NRB

15

25

52

79

106

133

160

216

270

N/A

N/A

N/A

N/ A

30

11

24

38

51

65

78

106

133

162

217

245

273

60

N/ A

11

18

24

31

38

51

65

79

107

121

135

<td namest="1"

CLAIMS

Claims ( 12 )

What is claimed is:

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

generating a signal including configuration information for at least one bandwidth part (BWP); and

transmitting the signal,

wherein at least part of the at least one BWP is configured as a resource for multicast transmission,

wherein the at least one BWP is a BWP for unicast transmission in case that the resource for multicast transmission is for a terminal that is in a radio resource control (RRC) connected state, and

wherein the at least one BWP is an initial BWP in case that the resource for multicast transmission is for a terminal that is in an RRC idle state or in an RRC inactive state.

2. The method of claim 1 ,

wherein the signal is a system information block 1 (SIB 1 ) message, in case that the at least one BWP is the initial BWP.

3. The method of claim 1 ,

wherein the signal is a physical downlink control channel (PDCCH) signal in case that the at least one BWP is the BWP for unicast transmission.

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

receiving a signal including configuration information for at least one bandwidth part (BWP);

identifying the at least one BWP based on the configuration information; and

receiving a multicast signal via at least part of the at least one BWP,

wherein at least part of the at least one BWP is configured as a resource for multicast transmission,

wherein the at least one BWP is a BWP for unicast transmission in case that the resource for multicast transmission is for a terminal that is in a radio resource control (RRC) connected state, and

wherein the at least one BWP is an initial BWP in case that the resource for multicast transmission is for a terminal that is in an RRC idle state or in an RRC inactive state.

5. The method of claim 4 ,

wherein the signal is a system information block 1 (SIB 1 ) message in case that the at least one BWP is the initial BWP.

6. The method of claim 4 ,

wherein the signal is a physical downlink control channel (PDCCH) signal in case that the at least one BWP is the BWP for unicast transmission.

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

a transceiver; and

at least one processor,

wherein the at least one processor is configured to:

generate a signal including configuration information for at least one bandwidth part (BWP), and

transmit the signal via the transceiver,

wherein at least part of the at least one BWP is configured as a resource for multicast transmission,

wherein the at least one BWP is a BWP for unicast transmission in case that the resource for multicast transmission is for a terminal that is in a radio resource control (RRC) connected state, and

wherein the at least one BWP is an initial BWP in case that the resource for multicast transmission is for a terminal that is in an RRC idle state or in an RRC inactive state.

8. The base station of claim 7 ,

wherein the signal is a system information block 1 (SIB 1 ) message, wherein in case that the at least one BWP is the initial BWP.

9. The base station of claim 7 ,

wherein the signal is a physical downlink control channel (PDCCH) signal in case that the at least one BWP is the BWP for unicast transmission.

10. A terminal in a wireless communication system, the terminal comprising:

a transceiver; and

at least one processor,

wherein the at least one processor is configured to:

receive, via the transceiver, a signal including configuration information for at least one bandwidth part (BWP),

identify the at least one BWP based on the configuration information, and

receive, via the transceiver, a multicast signal via at least part of the at least one BWP,

wherein at least part of the at least one BWP is configured as a resource for multicast transmission,

wherein the at least one BWP is a BWP for unicast transmission in case that the resource for multicast transmission is for a terminal that is in a radio resource control (RRC) connected state, and

wherein the at least one BWP is an initial BWP in case that the resource for multicast transmission is for a terminal that is in an RRC idle state or in an RRC inactive state.

11. The terminal of claim 10 ,

wherein the signal is a system information block 1 (SIB 1 ) message, in case that the at least one BWP is the initial BWP.

12. The terminal of claim 10 ,

wherein the signal is a physical downlink control channel (PDCCH) signal in case that the at least one BWP is the BWP for unicast transmission.

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