KR20230029462A - Method and apparatus of initial access for user equipment with reduced complexity in wireless communication system - Google Patents

Abstract

The present invention relates to an initial access method for a low complexity terminal in a wireless communication system and a device thereof. The method comprises the following steps of: receiving a first control signal transmitted from a base station; processing the received first control signal; and transmitting a second control signal generated based on the processing to the base station. Therefore, according to the present invention, a low complexity terminal and a non-low complexity terminal can efficiently share and use resources, and the low complexity terminal can effectively perform initial access.

Description

Initial access method and apparatus for low complexity terminal in wireless communication system

The present disclosure relates to a communication method and apparatus for a low complexity terminal in a wireless communication system, and more particularly to an initial access method and apparatus for a low complexity terminal.

Looking back at the process of development through successive generations of wireless communication, technologies for human-targeted services, such as voice, multimedia, and data, have been developed. After the commercialization of 5G (5th-generation) communication systems, it is expected that connected devices, which have been explosively increasing, will be connected to communication networks. Examples of objects connected to the network may include vehicles, robots, drones, home appliances, displays, smart sensors installed in various infrastructures, construction machinery, and factory equipment. Mobile devices are expected to evolve into various form factors such as augmented reality glasses, virtual reality headsets, and hologram devices. In the 6G (6th-generation) era, efforts are being made to develop an improved 6G communication system to provide various services by connecting hundreds of billions of devices and objects. For this reason, the 6G communication system is being called a (beyond 5G) system after 5G communication.

In the 6G communication system expected to be realized around 2030, the maximum transmission speed is tera (i.e., 1,000 gigabytes) bps, and the wireless delay time is 100 microseconds (μsec). That is, the transmission speed in the 6G communication system compared to the 5G communication system is 50 times faster and the wireless delay time is reduced to 1/10.

To achieve such high data rates and ultra-low latency, 6G communication systems use terahertz bands (such as the 95 GHz to 3 terahertz (3 THz) bands). An implementation in is being considered. In the terahertz band, it is expected that the importance of technology that can guarantee signal reach, that is, coverage, will increase due to more serious path loss and atmospheric absorption compared to the mmWave band introduced in 5G. As the main technologies for ensuring coverage, radio frequency (RF) devices, antennas, new waveforms that are superior in terms of coverage than orthogonal frequency division multiplexing (OFDM), beamforming, and massive multiple- Multi-antenna transmission technologies such as input and multiple-output (massive MIMO), full dimensional MIMO (FD-MIMO), array antenna, and large scale antenna must be developed. In addition, new technologies such as metamaterial-based lenses and antennas, high-dimensional spatial multiplexing technology using orbital angular momentum (OAM), and reconfigurable intelligent surface (RIS) are being discussed to improve coverage of terahertz band signals.

In addition, in order to improve frequency efficiency and system network, in the 6G communication system, full duplex technology in which uplink and downlink simultaneously utilize the same frequency resource at the same time, satellite and Network technology that integrates HAPS (high-altitude platform stations), network structure innovation technology that supports mobile base stations and enables network operation optimization and automation, dynamic frequency sharing through collision avoidance based on spectrum usage prediction (dynamic spectrum sharing) technology, AI (artificial intelligence) from the design stage, AI-based communication technology that realizes system optimization by internalizing end-to-end AI support functions, Development of next-generation distributed computing technology that realizes high-complexity services by utilizing ultra-high-performance communication and computing resources (mobile edge computing (MEC), cloud, etc.) is underway. In addition, through the design of a new protocol to be used in the 6G communication system, the implementation of a hardware-based security environment, the development of a mechanism for safe use of data, and the development of technology for maintaining privacy, connectivity between devices is further strengthened and networks are further strengthened. Attempts are ongoing to optimize, promote softwareization of network entities, and increase the openness of wireless communications.

Due to the research and development of these 6G communication systems, a new level of hyper-connected experience (the next hyper-connected experience) is realized through the hyper-connectivity of the 6G communication system, which includes not only connections between objects but also connections between people and objects. experience) is expected to be possible. Specifically, the 6G communication system is expected to provide services such as truly immersive extended reality (truly immersive XR), high-fidelity mobile hologram, and digital replica. In addition, services such as remote surgery, industrial automation, and emergency response through security and reliability enhancement are provided through the 6G communication system, which can be applied in various fields such as industry, medical care, automobiles, and home appliances. It will be.

In addition, 3GPP discussed the NR RedCap (Reduced Capability, Low Complexity) terminal standard, which enables communication with the 5G communication system to transmit and receive data while reducing the complexity of the terminal to support technologies such as sensors, surveillance cameras, and smart watches. is starting

An object of the present disclosure is to provide a method and apparatus for initial access of a low complexity terminal.

The present disclosure for solving the above problems provides a control signal processing method in a wireless communication system, comprising: receiving a first control signal transmitted from a base station; processing the received first control signal; and transmitting a second control signal generated based on the processing to the base station.

According to the present disclosure, a low complexity terminal and a non-low complexity terminal can efficiently share and use resources, and the low complexity terminal can effectively perform initial access.

1 is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource domain, in a wireless communication system to which the present disclosure is applied.
2 is a diagram illustrating a slot structure considered in a wireless communication system to which the present disclosure is applied.
3 is a diagram illustrating a synchronization signal block considered in a wireless communication system to which the present disclosure is applied.
4 is a diagram illustrating transmission cases of a synchronization signal block in a frequency band of 6 GHz or less considered in a wireless communication system to which the present disclosure is applied.
5 is a diagram illustrating transmission cases of a synchronization signal block in a frequency band of 6 GHz or higher considered in a wireless communication system to which the present disclosure is applied.
6 is a diagram illustrating transmission cases of synchronization signal blocks according to subcarrier intervals within a 5 ms time in a wireless communication system to which the present disclosure is applied.
7 is a diagram illustrating an initial bandwidth portion dedicated to a low complexity terminal and a control region #0 according to an embodiment of the present invention.
8 is a diagram illustrating a low complexity terminal procedure in a wireless communication system according to an embodiment of the present disclosure.
9 is a diagram illustrating a base station procedure in a wireless communication system according to an embodiment of the present disclosure.
10 is a block diagram of a terminal according to an embodiment of the present disclosure.
11 is a block diagram of a base station according to an embodiment of the present disclosure.

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

In describing the embodiments, descriptions of technical contents that are well known in the technical field to which the present disclosure belongs and are not directly related to the present disclosure will be omitted. This is to more clearly convey the gist of the present disclosure without obscuring it by omitting unnecessary description.

For the same reason, in the accompanying drawings, some components are exaggerated, omitted, or schematically illustrated. Also, the size of each component does not entirely reflect the actual size. In each figure, the same reference number is given to the same or corresponding component.

Advantages and features of the present disclosure, and methods for achieving them, will become clear with reference to embodiments described below in detail in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments described below and may be implemented in various different forms, but only the present embodiments make the present disclosure complete, and those of ordinary skill in the art to which the present disclosure belongs It is provided to completely inform the scope of the technical idea, the present disclosure is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification. In addition, in describing the present disclosure, if it is determined that a detailed description of a related function or configuration may unnecessarily obscure the gist of the present disclosure, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present disclosure, which may vary according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout this specification.

Hereinafter, a base station is a subject that performs resource allocation of a terminal, and is at least one of a gNode B, an eNode B, a Node B, a base station (BS), an access point (AP), a wireless access unit, a base station controller, or a node on a network. can The terminal may be at least one of a user equipment (UE), a mobile station (MS), a terminal, a cellular phone, a smart phone, a smart watch, a wearable device, a computer, and various multimedia devices capable of performing communication functions. In the disclosure, downlink (DL) is a radio transmission path of a signal transmitted from a base station to a terminal, and uplink (UL) refers to a radio transmission path of a signal transmitted from a terminal to a base station. In addition, although an LTE or LTE-A system may be described as an example in the following, embodiments of the present disclosure may be applied to other communication systems having a similar technical background or channel type. For example, the 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included in this, and the following 5G may be a concept including existing LTE, LTE-A and other similar services there is. In addition, the present disclosure can be applied to other communication systems through some modifications within a range that does not greatly deviate from the scope of the present disclosure as determined by those skilled in the art.

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

Additionally, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative embodiments, it is possible for the functions mentioned in the blocks to occur out of order. For example, it is possible that two blocks shown in succession may in fact be performed substantially concurrently, or that the blocks may sometimes be performed in reverse order depending on their function.

At this time, the term '~unit' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and '~unit' refers to certain roles. carry out However, '~ part' is not limited to software or hardware. '~bu' may be configured to be in an addressable storage medium and may be configured to reproduce one or more processors. Therefore, as an example, '~unit' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. Functions provided within components and '~units' may be combined into smaller numbers of components and '~units' or further separated into additional components and '~units'. In addition, components and '~units' may be implemented to play one or more CPUs in a device or a secure multimedia card. Also, in the embodiment, '~ unit' may include one or more processors.

Hereinafter, embodiments of the present disclosure will be described in detail with accompanying drawings. Hereinafter, the method and device proposed in the embodiments of the present disclosure will be described by taking IoT services (IWSN, Surveillance camera, wearable, etc.) as an example, but are not limited to each embodiment and are not applied. It may also be possible to utilize a downlink reception and uplink transmission method corresponding to other additional services by using a combination of all or some embodiments of one or more embodiments. Therefore, the embodiments of the present disclosure may be applied through some modifications within a range that does not significantly deviate from the scope of the present disclosure at the discretion of a person having skilled technical knowledge (ie, a person skilled in the art).

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

The wireless communication system has moved away from providing voice-oriented services in the early days and, for example, 3GPP's HSPA (High Speed Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2's High Rate Packet Data (HRPD), UMB (Ultra Mobile Broadband), and IEEE's 802.16e, a broadband wireless network that provides high-speed, high-quality packet data services. evolving into a communication system.

In the LTE system, which is a representative example of a broadband wireless communication system, OFDM (Orthogonal Frequency Division Multiplexing) is adopted in downlink (DL), and SC-FDMA (Single Carrier Frequency Division Multiple Access) in uplink (UL) method is being adopted. Uplink refers to a radio link through which a terminal transmits data or control signals to a base station, and downlink refers to a radio link through which a base station transmits data or control signals to a terminal. In addition, the above-described multiple access scheme distinguishes data or control information of each user by assigning and operating such that time-frequency resources to carry data or control information for each user do not overlap each other, that is, to establish orthogonality. Let it be.

The 5G communication system, which is a communication system after LTE, must support services that simultaneously satisfy various requirements so that various requirements such as users and service providers can be freely reflected. Services considered for the 5G communication system include enhanced mobile broadband (eMBB), massive machine type communication (mMTC), ultra reliability low latency communication (URLLC), etc. there is

eMBB aims to provide a data transmission rate that is more improved than that supported by existing LTE, LTE-A or LTE-Pro. For example, in a 5G communication system, an eMBB must be able to provide a peak data rate of 20 Gbps in downlink and a peak data rate of 10 Gbps in uplink from the perspective of one base station. In addition, the 5G communication system should provide a maximum transmission rate and, at the same time, an increased user perceived data rate of the terminal. In order to satisfy these requirements, various transmission/reception technologies may be improved, including a more advanced multi-input multi-output (MIMO) transmission technology. In addition, while signals are transmitted using a transmission bandwidth of up to 20 MHz in a 2 GHz band in the LTE system, the 5G communication system uses a frequency bandwidth wider than 20 MHz in a frequency band of 3 to 6 GHz or 6 GHz or higher, thereby increasing the data transmission rate required by the 5G communication system. can satisfy

At the same time, mMTC is being considered to support application services such as Internet of Things (IoT) in 5G communication systems. In order to efficiently provide IoT, mMTC requires access support for large-scale terminals within a cell, improved coverage of terminals, improved battery time, and reduced terminal cost. Since the IoT is attached to various sensors and various devices to provide a communication function, it must be able to support a large number of terminals (eg, 1,000,000 terminals/km ² ) in a cell. In addition, UEs supporting mMTC are likely to be located in shadow areas that are not covered by cells, such as the basement of a building due to the nature of the service, so they require wider coverage than other services provided by the 5G communication system. Terminals supporting mMTC are typically composed of low-cost terminals, and since it is difficult to frequently replace batteries of terminals, a very long battery life time such as about 10 to 15 years may be required.

Finally, in the case of URLLC, it is a cellular-based wireless communication service used for a specific purpose (mission-critical). For example, remote control of robots or machinery, industrial automation, unmaned aerial vehicles, remote health care, and emergency situations. A service used for emergency alert or the like may be considered. Therefore, the communication provided by URLLC must provide very low latency and very high reliability. For example, a service supporting URLLC must satisfy air interface latency of less than 0.5 milliseconds, and at the same time must satisfy requirements of a packet error rate of 10 ^-5 or less. Therefore, for a service supporting URLLC, the 5G system must provide a smaller transmit time interval (TTI) than other services, and at the same time allocate wide resources in the frequency band to secure the reliability of the communication link.

Three services of the 5G communication system (hereinafter, it can be mixed with the 5G system), that is, eMBB, URLLC, and mMTC, can be multiplexed and transmitted in one system. At this time, different transmission/reception techniques and transmission/reception parameters may be used between services in order to satisfy different requirements of each service.

Hereinafter, the frame structure of the 5G system will be described in more detail with reference to the drawings. Hereinafter, the wireless communication system to which the present disclosure is applied will be described by taking the configuration of a 5G system as an example for convenience of explanation, but in the same or similar way in a 5G or higher system or other communication systems to which the present disclosure is applicable, embodiments of the present disclosure can be applied

1 is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource domain, in a wireless communication system to which the present disclosure is applied.

(일례로 12) 개의 연속된 RE들은 하나의 자원 블록(resource block, RB, 104)을 구성할 수 있다. 또한, 시간 영역에서 서브프레임 당 심볼 수를 나타내는

개의 연속된 OFDM 심볼들은 하나의 서브프레임(subframe, 110)을 구성할 수 있다. 5G 시스템에서 자원 구조에 대한 보다 구체적인 설명은 TS 38.211 section 4 규격을 참조할 수 있다.In FIG. 1, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. The basic unit of resources in the time and frequency domains is a resource element (RE, 101), which is one Orthogonal Frequency Division Multiplexing (OFDM) symbol (or discrete Fourier transform spread OFDM (DFT-s-OFDM) symbol) on the time axis. (102) and one subcarrier (103) in the frequency axis. Representing the number of subcarriers per resource block (RB) in the frequency domain

(For example, 12) consecutive REs may constitute one resource block (RB, 104). In addition, representing the number of symbols per subframe in the time domain

Consecutive OFDM symbols may constitute one subframe (110). For a more detailed description of the resource structure in the 5G system, refer to TS 38.211 section 4 standard.

2 is a diagram illustrating a slot structure considered in a wireless communication system to which the present disclosure is applied.

))=14). 1개의 서브프레임(201)은 하나 또는 다수개의 슬롯(202, 203)으로 구성될 수 있으며, 1개의 서브프레임(201)당 슬롯(202, 203)의 개수는 부반송파 간격에 대한 설정 값인 μ(204, 205)에 따라 다를 수 있다.2 shows an example of a structure of a frame 200, a subframe 201, and a slot 202. One frame 200 may be defined as 10 ms. One subframe 201 may be defined as 1 ms, and thus one frame 200 may consist of a total of 10 subframes 201 . In addition, one slot (202, 203) may be defined with 14 OFDM symbols (ie, the number of symbols per one slot (

))=14). One subframe 201 may be composed of one or a plurality of slots 202 and 203, and the number of slots 202 and 203 per one subframe 201 is a set value for the subcarrier interval, μ(204). , 205).

)가 달라질 수 있고, 이에 따라 1개의 프레임 당 슬롯 수(

)가 달라질 수 있다. 각 부반송파 간격 설정 μ에 따른

및

는 하기의 표 1로 정의될 수 있다.In an example of FIG. 2, the slot structure is shown when μ = 0 (204) and μ = 1 (205) as the subcarrier interval setting value. When μ = 0 (204), one subframe 201 may consist of one slot 202, and when μ = 1 (205), one subframe 201 may consist of two slots ( 203). That is, the number of slots per subframe according to the setting value μ for the subcarrier interval (

) may vary, and accordingly, the number of slots per frame (

) may vary. According to each subcarrier spacing setting μ

and

Can be defined in Table 1 below.

μ

0 14 10 One One 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16 5 14 320 32

In the 5G wireless communication system, a synchronization signal block (which can be mixed with SSB, SS block, SS / PBCH block, etc.) can be transmitted for initial access of the terminal, synchronization The signal block may include a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). In the initial access step in which the terminal accesses the system, the terminal first obtains downlink time and frequency domain synchronization from a synchronization signal through cell search and obtains a cell ID. Acquire The synchronization signal includes PSS and SSS. In addition, the terminal receives a PBCH transmitting a master information block (MIB) from the base station to acquire system information related to transmission and reception such as system bandwidth or related control information and basic parameter values. Based on this information, the terminal can obtain a system information block (SIB) by decoding a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH). Thereafter, the terminal exchanges identification-related information between the base station and the terminal through a random access step, and initially accesses the network through steps such as registration and authentication.

Hereinafter, a cell initial access operation procedure of a 5G wireless communication system will be described in more detail with reference to the drawings.

The synchronization signal is a signal that is a reference signal for cell search, and is transmitted with a subcarrier interval suitable for a channel environment such as phase noise for each frequency band applied. The 5G base station may transmit a plurality of synchronization signal blocks according to the number of analog beams to be operated. For example, PSS and SSS may be mapped over 12 RBs and transmitted, and PBCH may be mapped over 24 RBs and transmitted. In the following, a structure in which a synchronization signal and a PBCH are transmitted in a 5G communication system will be described.

3 is a diagram illustrating a synchronization signal block considered in a wireless communication system to which the present disclosure is applied.

According to FIG. 3, a synchronization signal block (SS block) 300 includes a PSS 301, an SSS 303, and a broadcast channel (PBCH) 302.

As shown in FIG. 3, the synchronization signal block 300 is mapped to four OFDM symbols 304 on the time axis. The PSS 301 and the SSS 303 can be transmitted in 12 RBs 305 on the frequency axis and in the first and third OFDM symbols on the time axis, respectively. In the 5G system, for example, a total of 1008 different cell IDs can be defined, PSS 301 can have 3 different values according to the cell's physical layer ID, and SSS 303 can have 336 different values. can have a value. Through detection of the PSS 301 and the SSS 303, the terminal can obtain one of (336X3=) 1008 cell IDs in the combination. This can be expressed by Equation 1 below.

[Equation 1]

Here, N ⁽¹⁾ _ID can be estimated from the SSS 303 and has a value between 0 and 335. N ⁽²⁾ _ID can be estimated from the PSS 301 and has a value between 0 and 2. The UE can estimate the value of N ^cell _ID , which is a cell ID, using a combination of N ⁽¹⁾ _ID and N ⁽²⁾ _ID .

The PBCH 302 transmits 24 RBs 306 on the frequency axis and 6 RBs 307 and 308 on both sides excluding 12 RBs while the SSS 303 is transmitted in the 2nd to 4th OFDM symbols of the SS block on the time axis. It can be transmitted from the included resource. In the PBCH 302, various system information called MIB may be transmitted. More specifically, the MIB may include information shown in Table 2 below, and PBCH payload and PBCH demodulation reference singal (DMRS) contains the following additional information. For a more detailed description of the MIB in the 5G system, reference may be made to the TS 38.331 standard.

MIB ::= SEQUENCE {
systemFrameNumber BIT STRING(SIZE(6)),
subCarrierSpacingCommon ENUMERATED {scs15or60, scs30or120},
ssb-SubcarrierOffset INTEGER (0..15),
dmrs-TypeA-Position ENUMERATED {pos2, pos3},
pdcch-ConfigSIB1 PDCCH-ConfigSIB1,
cellBarred ENUMERATED {barred, notBarred},
intraFreqReselection ENUMERATED {allowed, notAllowed},
spare BIT STRING (SIZE (1))
}

- Synchronization signal block information: The frequency domain offset of the synchronization signal block is indicated through 4 bits (ssb-SubcarrierOffset) in the MIB. The index of the synchronization signal block including the PBCH may be indirectly acquired through PBCH DMRS and PBCH decoding. More specifically, in the frequency band below 6 GHz, 3 bits obtained through decoding of the PBCH DMRS indicate the synchronization signal block index, and in the frequency band above 6 GHz, 3 bits obtained through decoding of the PBCH DMRS and included in the PBCH payload A total of 6 bits, including 3 bits obtained from PBCH decoding, may indicate a synchronization signal block index including the PBCH.

- PDCCH (physical downlink control channel) information: the subcarrier spacing of the common downlink control channel is indicated through 1 bit (subCarrierSpacingCommon) in the MIB, and the CORESET (Identity, ID) of 0 through 8 bits (pdcch-ConfigSIB1) control resource set) and time-frequency resource configuration information of a search space (SS). The above CORESET of identifier 0 may be referred to as controlResourceSetZero , and the search area of identifier 0 may be referred to as searchspaceZero . In the present invention, the CORESET of identifier 0 is referred to as CORESET#0 or control region #0 for convenience, and the search region of identifier 0 is referred to as search region #0 for convenience. During the initial access to the cell, the terminal configures frequency resources indicating the number of RBs of CORESET#0 including the common search space set of the Type0-PDCCH CSS set and time resources indicating the number of OFDM symbols, etc. by the pdcch-ConfigSIB1 can receive

- SFN (system frame number): Within the MIB, 6 bits (systemFrameNumber) are used to indicate a part of the SFN. LSB (Least Significant Bit) 4 bits of SFN are included in the PBCH payload so that the UE can obtain them indirectly through PBCH decoding.

- Timing information in a radio frame: 1 bit (half frame) included in the above-described synchronization signal block index and PBCH payload and obtained through PBCH decoding. It can be indirectly confirmed whether it is transmitted in the second or second half frame.

Since the transmission bandwidths (12RBs (305)) of the PSS (301) and the SSS (303) and the transmission bandwidth (24RBs (306)) of the PBCH (302) are different, the PSS (301) In the first OFDM symbol to be transmitted, both 6 RBs 307 and 308 exist except for 12 RBs while the PSS 301 is transmitted, and the area can be used for transmitting other signals or be empty.

All synchronization signal blocks may be transmitted using the same analog beam. That is, PSS 301, SSS 303, and PBCH 302 may all be transmitted on the same beam. Since analog beams have characteristics that cannot be applied differently in the frequency axis, the same analog beam is applied to all frequency axis RBs within a specific OFDM symbol to which a specific analog beam is applied. That is, four OFDM symbols through which PSS 301, SSS 303, and PBCH 302 are transmitted can all be transmitted through the same analog beam.

4 is a diagram illustrating various transmission cases of a synchronization signal block in a frequency band of 6 GHz or less considered in a communication system to which the present disclosure is applied.

In a 5G communication system, a subcarrier spacing (SCS) of 15 kHz (420) and a subcarrier spacing of 30 kHz (430, 440) may be used for synchronization signal block transmission in a frequency band of 6 GHz or less. In the 15 kHz subcarrier spacing, there is one transmission case (case #1 (401)) for the synchronization signal block, and in the 30 kHz subcarrier spacing, two transmission cases (case # 2 (402) and case # 3 (case # 3)) exist for the synchronization signal block. 403)) may exist.

In FIG. 4, in case #1 (401) at a subcarrier interval of 15 kHz (420), the synchronization signal block is maximum within 1 ms (404) time (or when one slot is composed of 14 OFDM symbols, corresponding to the length of one slot). Two can be sent. In the example of FIG. 4, synchronization signal block #0 (407) and synchronization signal block #1 (408) are shown. For example, synchronization signal block #0 407 may be mapped to 4 consecutive symbols from the 3rd OFDM symbol, and synchronization signal block #1 408 may be mapped to 4 consecutive symbols from the 9th OFDM symbol. can be mapped.

Different analog beams may be applied to the synchronization signal block #0 (407) and the synchronization signal block #1 (408). The same beam can be applied to all 3rd to 6th OFDM symbols to which synchronization signal block #0 (407) is mapped, and the same beam is applied to all 9th to 12th OFDM symbols to which synchronization signal block #1 (408) is mapped. can In the 7th, 8th, 13th, and 14th OFDM symbols to which the synchronization signal block is not mapped, analog beams can be freely determined under the determination of which beam will be used by the base station.

In FIG. 4, in case #2 (402) at a subcarrier interval of 30 kHz (430), the synchronization signal block is generated within 0.5 ms (405) time (or when one slot is composed of 14 OFDM symbols, corresponding to a length of one slot) A maximum of two can be transmitted, and accordingly, a maximum of four synchronization signal blocks can be transmitted within a time of 1 ms (or 2 slots when one slot is composed of 14 OFDM symbols). In the example of FIG. 4, synchronization signal block #0 (409), synchronization signal block #1 (410), synchronization signal block #2 (411), and synchronization signal block #3 (412) are 1 ms (ie, two slots). The case of transmission within time is shown. At this time, synchronization signal block #0 (409) and synchronization signal block #1 (410) can be mapped from the 5th OFDM symbol and the 9th OFDM symbol of the first slot, respectively, and synchronization signal block #2 (411) and Synchronization signal block #3 412 may be mapped from the third OFDM symbol and the seventh OFDM symbol of the second slot, respectively.

Different analog beams may be applied to the synchronization signal block #0 (409), synchronization signal block #1 (410), synchronization signal block #2 (411), and synchronization signal block #3 (412). 5th to 8th OFDM symbols of the first slot through which synchronization signal block #0 (409) is transmitted, 9th through 12th OFDM symbols of the first slot through which synchronization signal block #1 (410) is transmitted, and synchronization signal block #2 The same analog beam may be applied to the 3rd to 6th symbols of the second slot in which 411 is transmitted and the 7th to 10th symbols in the second slot in which synchronization signal block #3 412 is transmitted. In OFDM symbols to which a synchronization signal block is not mapped, an analog beam may be freely determined under the determination of which beam to be used by the base station.

In FIG. 4, in case #3 (403) at a subcarrier interval of 30 kHz (440), the synchronization signal block is generated within 0.5 ms (406) time (or when one slot is composed of 14 OFDM symbols, corresponding to a length of one slot) A maximum of two can be transmitted, and accordingly, a maximum of four synchronization signal blocks can be transmitted within a time of 1 ms (or 2 slots when one slot is composed of 14 OFDM symbols). In the example of FIG. 4, synchronization signal block #0 413, synchronization signal block #1 414, synchronization signal block #2 415, and synchronization signal block #3 416 are 1 ms (ie, two slots). Transmission within time is shown. At this time, synchronization signal block #0 (413) and synchronization signal block #1 (414) can be mapped from the 3rd OFDM symbol and 9th OFDM symbol of the first slot, respectively, and are synchronized with synchronization signal block #2 (415). Signal block #3 416 may be mapped from the third OFDM symbol and the ninth OFDM symbol of the second slot, respectively.

Different analog beams may be used for the synchronization signal block #0 (413), synchronization signal block #1 (414), synchronization signal block #2 (415), and synchronization signal block #3 (416). As described in the above examples, the same analog beam can be used in all four OFDM symbols in which each synchronization signal block is transmitted, and the base station freely determines which beam to use in OFDM symbols to which a synchronization signal block is not mapped. can be determined

5 is a diagram illustrating transmission cases of a synchronization signal block in a frequency band of 6 GHz or higher considered in a wireless communication system to which the present disclosure is applied.

In the 5G communication system, in the frequency band of 6 GHz or higher, synchronization signal block transmission requires a subcarrier spacing of 120 kHz (530) as in case #4 (510) and a subcarrier spacing of 240 kHz (540) as in the example of case #5 (520). can be used

In Case #4 (510) with a subcarrier spacing of 120 kHz (530), up to 4 synchronization signal blocks are transmitted within 0.25 ms (501) time (or if 1 slot consists of 14 OFDM symbols, corresponding to 2 slot lengths) It can be. In the example of FIG. 5 , synchronization signal block #0 (503), synchronization signal block #1 (504), synchronization signal block #2 (505), and synchronization signal block #3 (506) are performed at 0.25 ms (ie, two slots). The transmission case is shown. At this time, synchronization signal block #0 (503) and synchronization signal block #1 (504) can be mapped to 4 consecutive symbols from the 5th OFDM symbol of the first slot, respectively, and from the 9th OFDM symbol It can be mapped to 4 symbols, and synchronization signal block # 2 (505) and synchronization signal block # 3 (506) can each be mapped to 4 consecutive symbols from the 3rd OFDM symbol of the second slot, It can be mapped to 4 consecutive symbols from the 7th OFDM symbol.

As described in the above embodiment, synchronization signal block #0 (503), synchronization signal block #1 (504), synchronization signal block #2 (505), and synchronization signal block #3 (506) each have different analog beams. can be used In addition, the same analog beam may be used in all four OFDM symbols in which each synchronization signal block is transmitted, and the base station may freely determine which beam is to be used in OFDM symbols to which a synchronization signal block is not mapped.

In Case #5 (520) at a subcarrier interval of 240 kHz (540), up to 8 synchronization signal blocks are available within 0.25 ms (502) time (or if 1 slot consists of 14 OFDM symbols, corresponding to a length of 4 slots). can be transmitted In the example of FIG. 5, synchronization signal block #0 (507), synchronization signal block #1 (508), synchronization signal block #2 (509), synchronization signal block #3 (510), synchronization signal block #4 (511), A case in which synchronization signal block #5 (512), synchronization signal block #6 (513), and synchronization signal block #7 (514) are transmitted in 0.25 ms (ie, 4 slots) is shown. At this time, synchronization signal block #0 (507) and synchronization signal block #1 (508) may be mapped to 4 consecutive symbols from the 9th OFDM symbol of the first slot, respectively, and each consecutive sequence from the 13th OFDM symbol It may be mapped to 4 symbols, and synchronization signal block # 2 (509) and synchronization signal block # 3 (510) may be mapped to 4 consecutive symbols from the 3rd OFDM symbol of the second slot, respectively, It can be mapped to 4 consecutive symbols from the 7th OFDM symbol, and synchronization signal block #4 (511), synchronization signal block #5 (512), and synchronization signal block #6 (513) are respectively It may be mapped to 4 consecutive symbols from the th OFDM symbol, it may be mapped to 4 consecutive symbols from the 9th OFDM symbol, and it may be mapped to 4 consecutive symbols from the 13th OFDM symbol, Synchronization signal block #7 514 may be mapped to 4 consecutive symbols from the 3rd OFDM symbol of the 4th slot.

As described in the above embodiment, synchronization signal block #0 (507), synchronization signal block #1 (508), synchronization signal block #2 (509), synchronization signal block #3 (510), synchronization signal block #4 ( 511), synchronization signal block #5 512, synchronization signal block #6 513, and synchronization signal block #7 514, respectively, different analog beams may be used. In addition, the same analog beam may be used in all four OFDM symbols in which each synchronization signal block is transmitted, and in OFDM symbols to which a synchronization signal block is not mapped, which beam to be used may be freely determined by the base station.

6 is a diagram illustrating transmission cases of synchronization signal blocks according to subcarrier intervals within a 5 ms time in a wireless communication system to which the present disclosure is applied. In the 5G communication system, synchronization signal blocks may be periodically transmitted in units of 5ms (corresponding to 5 subframes or half frames, 610).

In a frequency band of 3 GHz or less, up to four synchronization signal blocks may be transmitted within 5 ms (610) time. In a frequency band of more than 3 GHz and less than 6 GHz, up to 8 synchronization signal blocks may be transmitted. In a frequency band exceeding 6 GHz, up to 64 synchronization signal blocks may be transmitted. As described above, subcarrier spacings of 15 kHz and 30 kHz may be used at frequencies below 6 GHz.

In the example of FIG. 6, in Case # 1 (401) at a subcarrier interval of 15 kHz composed of one slot in FIG. 621) can be transmitted, and in a frequency band of more than 3 GHz and less than 6 GHz, synchronization signal blocks can be mapped to the first, second, third, and fourth slots, so that up to eight 622 can be transmitted. In Case #2 (402) or Case #3 (403) at a subcarrier interval of 30 kHz composed of two slots in FIG. 631 and 641) can be transmitted, and in a frequency band of more than 3 GHz and less than 6 GHz, synchronization signal blocks can be mapped starting from the first and third slots, so that up to 8 blocks 632 and 642 can be transmitted.

Subcarrier spacings of 120 kHz and 240 kHz may be used at frequencies above 6 GHz. In the example of FIG. 6, in Case #4 510 at a subcarrier interval of 120 kHz composed of two slots in FIG. 5, the synchronization signal blocks are 1, 3, 5, 7, 11, 13, 15, 17, Since it can be mapped starting from the 21st, 23rd, 25th, 27th, 31st, 33rd, 35th, and 37th slots, up to 64 slots (651) can be transmitted. In the example of FIG. 6, in Case #5 520 at a subcarrier interval of 240 kHz composed of four slots in FIG. It can be mapped starting from the slot, so up to 64 (661) can be transmitted.

Meanwhile, the terminal may acquire the SIB after decoding the PDCCH and the PDSCH based on the system information included in the received MIB. The SIB includes at least one of an uplink cell bandwidth, a random access parameter, a paging parameter, and a parameter related to uplink power control.

Meanwhile, in 3GPP, a discussion on a reduced capability UE operating based on NR is in progress. In the present disclosure, the low complexity terminal obtains cell synchronization by receiving a synchronization signal block as in the embodiment of FIG. 4 or 5 in initial cell access to access a cell (or base station), and then obtains MIB or SIB. Alternatively, it is possible to determine whether the cell supports a low complexity terminal through a random access process. When it is determined that the cell supports the low-complexity terminal, the low-complexity terminal determines the size of the bandwidth supported by the low-complexity terminal in the cell, whether full-duplex communication or half-duplex communication is supported, and The number of transmit or receive antennas being used (or supported), whether the low-complexity terminal supports the case where the bandwidth portion dedicated to the terminal set by the upper signal includes the control region #0 and the synchronization signal block, or the terminal set by the upper signal Even when the dedicated bandwidth part does not include control region #0 and synchronization signal block, at least one piece of capability information on whether the low complexity terminal supports the base station is transmitted to the base station, so that the terminal attempting to access the low complexity terminal It is possible for the base station to know that Alternatively, if half-duplex communication support is required implementation for a low complexity terminal, whether or not the half-duplex communication is supported may be omitted from capability information.

The base station configures a separate random access resource for each of the low complexity terminal or the low complexity terminal supporting duplex communication and the low complexity terminal supporting half duplex communication, and transmits configuration information on the random access resource to the low complexity terminal through system information. can be transmitted to the terminal. The system information for transmitting the information on the random access resource may be separately transmitted system information that is distinguished from system information for a terminal supporting a standard of a different version within a cell, and the base station supports a standard of a different version. By setting separate random access resources for the terminal and the low complexity terminal, it may be possible to distinguish whether the terminal supporting the standard of the different version performs random access or the low complexity terminal performs random access. Alternatively, the base station may configure a common random access resource for all terminals within the cell without configuring a separate random access resource for the low complexity terminal. In this case, configuration information on the random access resource may be transmitted to all terminals in a cell through system information, and the terminal receiving the system information may perform random access on the random access resource.

Thereafter, the terminal may complete the random access process and enter the RRC connection mode for transmitting and receiving data to and from the cell.

In general, a terminal may form a radio link with a network through a random access procedure based on synchronization with a network and system information obtained in a cell search process of a cell. For random access, a contention-based or contention-free scheme may be used. In the initial cell access phase, when the UE performs cell selection and reselection, for example, when moving from the RRC_IDLE (RRC idle) state to the RRC_CONNECTED (RRC connected) state, a contention-based random access scheme is used. can Non-contention-based random access may be used when uplink synchronization is reset when downlink data arrives, when handover occurs, or when location measurement occurs.

Table 3 below illustrates conditions (events) for triggering a random access procedure in a 5G system. For detailed description, TS 38.300 may be referred to.

-Initial access from RRC_IDLE;
- RRC Connection Re-establishment procedure;
- DL or UL data arrival during RRC_CONNECTED when UL synchronization status is "non-synchronised";
- UL data arrival during RRC_CONNECTED when there are no PUCCH resources for SR available;
- SR failure;
- Request by RRC upon synchronous reconfiguration (eg handover);
- Transition from RRC_INACTIVE;
- To establish time alignment for a secondary TAG;
- Request for Other SI (see clause 7.3);
- Beam failure recovery;

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

In the 5G communication system, the base station may set one or a plurality of bandwidth parts to the terminal, and may set the following information for each bandwidth part.

BWP ::= SEQUENCE {
bwp-Id BWP-Id,
(Bandwidth Part Identifier)
locationAndBandwidth INTEGER (1..65536),
(Bandwidth part position)
subcarrierSpacing ENUMERATED {n0, n1, n2, n3, n4, n5},
(subcarrier spacing)
cyclicPrefix ENUMERATED { extended }
(cyclic prefix)
}

In addition to the setting information, various parameters related to the bandwidth portion may be set for the terminal. The information may be transmitted from the base station to the terminal through higher layer signaling, for example, RRC signaling. At least one bandwidth part among one or a plurality of set bandwidth parts may be activated. Whether or not the set bandwidth portion is activated may be semi-statically transmitted from the base station to the terminal through RRC signaling or dynamically transmitted through DCI.

The terminal before the RRC connection may receive an initial bandwidth portion (Initial BWP) for initial access from the base station through a Master Information Block (MIB) or System Information Block 1 (SIB1).

In detail, the setting of the control area #0, search space #0, and the initial bandwidth part is explained in detail. In the initial access step, the terminal transmits system information (Remaining System Information; RMSI or System Information Block 1; SIB1) required for initial access through MIB in the initial access step. It is possible to receive configuration information about control region #0 and search space #0 to which a PDCCH for receiving a PDCCH can be transmitted. The control area and search space set by MIB can be regarded as identity (ID) 0, respectively. The base station may notify the terminal of setting information such as frequency allocation information, time allocation information, and numerology for the control region #0 through the MIB. In addition, the base station may notify the terminal of configuration information about the monitoring period and occasion for control region #0, that is, configuration information about search space #0, through the MIB.

In the method for setting the initial bandwidth part, terminals before RRC connection (Connected) can receive setting information on the initial bandwidth part (Initial Bandwidth Part) through a Master Information Block (MIB) in an initial access step. More specifically, the terminal is a control region (Control Resource Set, CORESET) can be set. The bandwidth of the control region set as the MIB may be regarded as an initial bandwidth part, and the terminal may receive the PDSCH through which the SIB is transmitted through the set initial bandwidth part. The initial bandwidth portion may be used for other system information (Other System Information, OSI), paging, and random access in addition to the purpose of receiving the SIB.

In the case of a low-complexity terminal, the RF bandwidth is reduced to reduce the complexity of the terminal (100MHz to 20MHz for FR1, 200MHz to 100MHz for FR2), and the number of receiving antennas is reduced from 4 or 2 to 1 or 2 We are considering ways to reduce complexity, such as reducing from 1 to 1. When a low complexity terminal and an existing non-low complexity terminal (or Rel-16 terminal) coexist in one base station, the initial bandwidth portion of the low complexity terminal upon initial access due to the RF bandwidth of only the low complexity terminal different from the existing Rel-16 terminal and a method for supporting the control area #0 is required. In addition, since the number of reception antennas of the low complexity terminal may be smaller than that of the existing Rel-16 terminal, a large number of downlink resources may be required in control region #0 to provide downlink coverage similar to that of the existing Rel-16 terminal. . At this time, the present disclosure supports an initial bandwidth portion dedicated to low complexity terminals and control region #0 during initial access of a plurality of low complexity terminals while minimizing the impact on downlink resources required for data transmission and reception with existing Rel-16 terminals. provides a way to do so.

7 is a diagram illustrating settings of an initial bandwidth portion and control region #0 for a low complexity terminal. Using FIG. 7, a low complexity terminal receives resource configuration for an initial bandwidth portion from a resource different from a non-low complexity terminal (or an existing Rel-16 terminal) and receives resource configuration of control region #0 that may exist within the initial bandwidth. Please explain the plan.

As described in FIG. 3, an existing Rel-16 terminal or a low complexity terminal may receive PSS, SSS, and PBCH in the synchronization signal block 701. Existing Rel-16 UE or low complexity UE uses multiplexing pattern information between synchronization signal block 701 and control region #0 (702) through pdcch-ConfigSIB1 in MIB in the PBCH, and in the frequency domain of control region #0 (702). The number of RBs and the number of symbols in the time domain, offset 703 information between the start position of the frequency domain of the control region #0 (702) and the start position of the frequency domain of the synchronization signal block 701, the time domain of control region #0 Slots and symbol positions in can be obtained.

For example, a Rel-16 terminal or a low-complexity terminal may determine one of the index values between 0 and 15 in the following [Table A] through 4 bits of pdcch-ConfigSIB1, and the information corresponding to the determined index value Some of them, that is, multiplexing pattern information between the synchronization signal block 701 and control region #0 (702), the number of RBs in the frequency domain and the number of symbols in the time domain of control region #0 (702), control region #0 Information on an offset 703 between the start position of the frequency domain of 702 and the start position of the synchronization signal block 701 in the frequency domain can be obtained. In addition, the Rel-16 terminal or low complexity terminal can determine one of the index values between 0 and 15 in the following [Table B] through another 4 bits of pdcch-ConfigSIB1, and the above index value corresponding to the determined index value Some of the information, that is, slots and symbol positions in the time domain of control area #0 can be obtained. The following [Table A] and [Table B] disclose only some tables, and other tables for mapping the same information may exist. Hereinafter, multiplexing pattern information between the synchronization signal block and control region #0 with a specific number of bits, the number of RBs in the frequency domain of control region #0 and the number of symbols in the time domain, the start position of control region #0 in the frequency domain and the synchronization signal A table for indicating offset information between time positions in the frequency domain of a block may be Table A, and a table for indicating slots and symbol positions in the time domain of control region #0 with a specific number of bits is Table B. It can be. Among the plurality of tables A and B, which [Table A] and [Table B] the low complexity terminal selects is the subcarrier spacing (SCS) of the synchronization signal block, the SCS of the control channel, and the frequency band It can be determined by information on a frequency band operating based on a minimum channel bandwidth of , shared spectrum channel access. Table A and Table B below may refer to TS 38.213.

[Table A]

[Table B]

By acquiring the above information, an existing Rel-16 terminal or a low complexity terminal can determine the time-frequency position of control region #0 (702).

If the initial bandwidth part 700 is not provided to the existing Rel-16 terminal or low complexity terminal through initialDownlinkBWP in SIB1, the initial bandwidth part 700 is the frequency domain of the control region #0 702, that is, control It can be defined as having the same frequency resource as the frequency resource according to the location and number of consecutive PRBs starting from the PRB of the lowest value of region #0 702 and ending with the PRB of the highest value.

The initial bandwidth portion may be a common initial bandwidth portion applicable to all UEs in the cell, that is, existing Rel-16 UEs or low complexity UEs, or a common control region #0. However, since the number of reception antennas of the low complexity terminal may be smaller than that of the existing Rel-16 terminal, a large number of downlink resources may be required in the initial bandwidth part or control region #0 to provide downlink coverage similar to that of the existing Rel-16 terminal. there is. At this time, while minimizing the impact on downlink resources within the initial bandwidth required for data transmission and reception with the existing Rel-16 terminal, the initial bandwidth portion dedicated to low complexity terminals and control region #0 are supported during initial access of multiple low complexity terminals. You need a way to do it.

First, it is possible for the low complexity terminal to utilize the last bit, spare 1 bit, in the MIB in the PBCH in order to determine whether the initial bandwidth portion dedicated to the low complexity terminal or control region #0 exists. That is, the base station indicates the existence of the initial bandwidth portion dedicated to the low complexity terminal or the control region #0 by using the above spare 1 bits as ENUMERATED {existed, notExisted}, and the low complexity terminal indicates the value in the spare 1 bits. It is possible to determine whether there is an initial bandwidth portion dedicated to the low complexity terminal or control region #0 by receiving .

Next, a method of setting an initial bandwidth portion or control region #0 dedicated to the low complexity terminal through SIB1 or a new SIB dedicated to the low complexity terminal to the low complexity terminal will be described. In the present invention, by a method of associating the location information of the frequency or time resource of the common initial bandwidth portion or the control region #0 or the initial bandwidth portion dedicated to the low complexity terminal from the location information of the frequency or time resource of the control region #0. A method for determining the frequency or time resource of the initial bandwidth portion dedicated to the low complexity terminal or the control region #0 will be mainly described. Alternatively, a method of determining the frequency or time resources of the initial bandwidth portion dedicated to the low complexity terminal or the control region #0 independently of the common initial bandwidth portion or the resource configuration of the control region #0 is also proposed. In the following schemes, the size in the frequency domain of the initial bandwidth portion or control region # 0 dedicated to low complexity terminals is up to 20 MHz in the case of FR1 (eg 450 MHz - 7125 MHz), FR2 (eg 24250 MHz - 52600 MHz) within a maximum of 100 MHz can be set.

As a first method, the time resources of the control region #0 (712) dedicated to the low-complexity terminal may be determined from location information of the time resources of the common control region #0 (702). The time resource of the control region #0 712 dedicated to the low complexity terminal is at least one slot or/and at least one symbol, or a starting point represented by a slot or/and symbol and the length of the time resource (slot or/and symbol). ), or offset information, and the time resources of the control region #0 712 dedicated to the low complexity terminal may be modified by a predetermined method from the time resources of the common control region #0 702. . That is, the information indicating the time resources of the control region #0 712 dedicated to the low complexity terminal may be determined based on the information indicating the time resources of the common control region #0 702. For example, positions of slots and symbols of the control region #0 712 dedicated to the low complexity terminal may be identical to positions of slots and symbols of the common control region #0 702 . In this case, the initial bandwidth portion 710 dedicated to the low complexity terminal may be located in a different frequency domain from the common initial bandwidth portion 700 . This technique is only an example, and the present invention is not limited by the example.

Accordingly, the low complexity terminal can receive the setting information of the initial bandwidth portion 710 dedicated to the low complexity terminal through SIB1 or a new SIB dedicated to the low complexity terminal. For example, initialDownlinkBWPForRedCap, which is setting information for the initial bandwidth portion 710 dedicated to the low complexity terminal in SIB1, may be included at the very end of SIB1 as follows.

DownlinkConfigCommonSIB ::= SEQUENCE {
frequencyInfoDL FrequencyInfoDL-SIB,
initialDownlinkBWP BWP-DownlinkCommon,
bcch-Config BCCH-Config,
pcch-Config PCCH-Config,
...
initialDownlinkBWPForRedCap BWP-DownlinkCommon,
}

As another example, initialDownlinkBWP, which is configuration information for the initial bandwidth portion 710 dedicated to the low complexity terminal, may be included in the new SIB only for the low complexity terminal as follows.

SIBForRedCap ::= SEQUENCE {
initialDownlinkBWP BWP-DownlinkCommon,
}

The setting information initialDownlinkBWPForRedCap or initialDownlinkBWP for the initial bandwidth portion dedicated to the low complexity terminal may include information indicating the frequency position and bandwidth of the initial bandwidth portion, information indicating subcarrier spacing, and information indicating a cyclic prefix.

In the first method, the remaining resource settings except for the time resources of the control region #0 712 dedicated to the low-complexity terminal are SIB1 in such a way that the PDCCH-ConfigSIB1 indicates index values in [Table A] and [Table B]. Alternatively, it is possible by a method in which an index value indicating resource configuration is indicated through PDCCH-ConfigCommon included in a new SIB dedicated to low complexity terminals. At this time, the index value indicated in the PDCCH-ConfigCommon included in the SIB1 or the new SIB may be based on [Table A] and [Table B]. At this time, only some information including the number of RBs in the frequency domain of the control region #0 712 in [Table A] and [Table B] may be valid for the low complexity terminal, and information other than the above information, that is, At least one of multiplexing pattern information between the synchronization signal block and control region #0 712 and offset information between the start position of the frequency domain of control region #0 712 and the start position of the synchronization signal block in the frequency domain is provided by the low complexity terminal. can be ignored Alternatively, in [Table A] and [Table B], information on the number of symbols in the time domain of control area #0 712 and information on slots and symbol positions in the time domain of control area #0 are common as an example. The low complexity terminal can expect that a value indicating the same position as the slot and symbol position of the control region #0 702 of the control region #0 of the control region #0 702 will be set.

Alternatively, it is also possible to define a table similar to [Table A] and [Table B] for the control region #0 712 applied to the low complexity terminal. In this case, the number of RBs in the frequency domain, the synchronization signal block and the control region At least one of multiplexing pattern information of #0 (712) and offset information of control region #0 (712) is indicated by an index value indicated in PDCCH-ConfigCommon included in the SIB1 or the SIB dedicated to the new low complexity terminal. it is possible to become In this case, the index based on the table may indicate only some information including the number of RBs in the frequency domain of the control region #0 (712).

As a second method, the frequency or time resource of the control region #0 (712) dedicated to the low-complexity terminal may be independently determined from location information of the frequency or time resource of the common control region #0 (702).

Therefore, a method for setting frequency or time resources of the initial bandwidth portion 710 dedicated to the low complexity terminal and the control region #0 712 may be required. First, a method for setting an initial bandwidth dedicated to the low-complexity terminal will be described. The low-complexity terminal can receive configuration information of the initial bandwidth portion 710 dedicated to the low-complexity terminal through SIB1 or a new SIB dedicated to the low-complexity terminal. For example, initialDownlinkBWPForRedCap, which is setting information for the initial bandwidth portion 710 dedicated to the low complexity terminal in SIB1, may be included at the very end of SIB1 as follows.

DownlinkConfigCommonSIB ::= SEQUENCE {
frequencyInfoDL FrequencyInfoDL-SIB,
initialDownlinkBWP BWP-DownlinkCommon,
bcch-Config BCCH-Config,
pcch-Config PCCH-Config,
...
initialDownlinkBWPForRedCap BWP-DownlinkCommon,
}

As another example, initialDownlinkBWP, which is configuration information for the initial bandwidth portion 710 dedicated to the low complexity terminal, may be included in the new SIB only for the low complexity terminal as follows.

SIBForRedCap ::= SEQUENCE {
initialDownlinkBWP BWP-DownlinkCommon,
}

The setting information initialDownlinkBWPForRedCap or initialDownlinkBWP for the initial bandwidth portion dedicated to the low complexity terminal may include information indicating the frequency position and bandwidth of the initial bandwidth portion, information indicating subcarrier spacing, and information indicating a cyclic prefix.

Next, the frequency or time resource configuration of the control region #0 712 dedicated to the low-complexity terminal is performed on the SIB1 or the new SIB in a manner in which the PDCCH-ConfigSIB1 indicates the index values in [Table 1] and [Table 2]. It is possible in such a way that an index value indicating resource configuration is indicated through the included PDCCH-ConfigCommon. At this time, the index value indicated in the PDCCH-ConfigCommon included in the SIB1 or the new SIB may be based on [Table A] and [Table B]. At this time, information on the number of RBs in the frequency domain of control region #0 (712) and the number of symbols in the time domain in [Table A] and [Table B], in the time domain of control region #0 (712) Only some information, including information on slots and symbol positions, may be available to low-complexity terminals, and information other than the above information, that is, multiplexing pattern information between the synchronization signal block and control region #0 (712), control region #0 At least one piece of offset information between the frequency domain start position of 712 and the frequency domain start position of the synchronization signal block may be ignored by the low complexity terminal.

Alternatively, it is also possible to define a table similar to [Table A] and [Table B] for the control region #0 (712) applied to the low complexity terminal. In this case, the number of RBs in the frequency domain, the control region #0 (712 ), information on slots and symbol positions in the time domain, multiplexing pattern information of a synchronization signal block and control area #0 (712), and offset information of control area #0 (712). It is possible to indicate by an index value indicated in PDCCH-ConfigCommon included in the SIB. At this time, the index based on the table is information on the number of RBs in the frequency domain of control region #0 (712) and the number of symbols in the time domain, slots and symbols in the time domain of control region #0 (712) It is also possible to indicate only some information including information about location.

As a third method, the frequency resources of the initial bandwidth portion 720 or 730 dedicated to the low-complexity terminal or the control region #0 722 or 732 are the frequency resources of the common initial bandwidth portion 700 or the control region #0 702. It can be determined from location information. The frequency resource of the control region #0 (722 or 732) dedicated to the low-complexity terminal includes at least one PRB, or a starting point represented by a PRB or/and subcarrier, a width of the frequency resource (PRB or/and subcarrier), or offset information. , and the frequency resources of the control region #0 (722 or 732) dedicated to the low-complexity terminal may be obtained by transforming the frequency resources of the common control region #0 (702) in a predetermined method. That is, the information indicating the frequency resource of the control region #0 (722 or 732) dedicated to the low complexity terminal may be determined based on the information indicating the frequency resource of the common control region #0 (702).

For example, the PRB location on the frequency axis of the initial bandwidth portion 720 dedicated to the low-complexity terminal includes the common initial bandwidth portion 700 or the frequency domain of the control region #0 702, and the common initial bandwidth It may include an additional frequency domain as much as the offset 723 based on the PRB of the lowest value of the portion 700 or the control region #0 702 . As another example, the frequency PRB location of the initial bandwidth portion 730 dedicated to the terminal includes the common initial bandwidth portion 700 or the frequency domain of the control region #0 702, and the common initial bandwidth portion 700 Alternatively, it may include additional frequency domains equal to the offset 733 based on the PRB of the highest value of the control region #0 702 . This technique is only an example, and the present invention is not limited by the example.

Next, the frequency or time resource configuration of the control region #0 (722 or 732) dedicated to the low-complexity terminal is performed in a manner in which the PDCCH-ConfigSIB1 indicates the index values in [Table A] and [Table B], and the SIB1 or the new It is possible by a method in which an index value indicating resource configuration is indicated through the PDCCH-ConfigCommon included in the SIB dedicated to the low complexity terminal. At this time, the index value indicated in the PDCCH-ConfigCommon included in the SIB1 or the new SIB may be based on [Table A] and [Table B]. Information on the number of RBs in the frequency domain of control region #0 (722 or 732) and the number of symbols in the time domain in [Table A] and [Table B], in the time domain of control region #0 (722 or 732) Only some information, including information on the slot and symbol position of , may be available to the low complexity terminal, and information other than the above information, that is, multiplexing pattern information between the synchronization signal block and control region #0 (722 or 732), control At least one piece of offset information between the frequency domain starting position of region #0 (722 or 732) and the frequency domain starting position of the synchronization signal block may be ignored by the low complexity terminal. In this case, the starting position in the frequency domain of the control region #0 (722 or 732) may be the same as the starting position in the frequency domain of the initial bandwidth portion 720 or 730 dedicated to the low complexity terminal determined above.

Alternatively, it is also possible to define a table similar to [Table A] and [Table B] for the control region #0 (722 or 732) applied to the low complexity terminal. In this case, the number of RBs in the frequency domain, the control region #0 At least one of information on slot and symbol positions in the time domain of 712, multiplexing pattern information of synchronization signal block and control area #0 (712), and offset information of control area #0 (712) is the SIB1 Alternatively, it is possible to indicate by an index value indicated in PDCCH-ConfigCommon included in the new SIB. At this time, the index based on the table is information on the number of RBs in the frequency domain of control region #0 (722 or 732) and the number of symbols in the time domain, and in the time domain of control region #0 (722 or 732) It is also possible to indicate only some information including information on slots and symbol positions of .

It is also possible that the initial bandwidth portion dedicated to the low complexity terminal and the control region #0 proposed through the above method and the like are used after the initial access. That is, until performing random access after initial cell access, the low complexity terminal is defined in the standard to use only the common initial bandwidth portion or control region #0, and after random access, for example, after PUCCH transmission for msg 4, the low complexity terminal It may be defined in the standard that data transmission and reception is performed through the initial bandwidth portion dedicated to the complexity terminal and the control region #0. Alternatively, as soon as the low complexity terminal receives settings for the initial bandwidth portion dedicated to the low complexity terminal and the control region #0, it is in accordance with the standard to transmit and receive data through the initial bandwidth portion dedicated to the low complexity terminal and the control region #0. may be defined.

Below, a method for the low complexity terminal to determine the initial bandwidth portion is described.

The low-complexity terminal receives a common initial bandwidth portion through reception of SIB1 or a new SIB dedicated to the low-complexity terminal or a common control region #0 setting by MIB reception, and the initial bandwidth portion setting information dedicated to the low-complexity terminal When receiving, a procedure for the low complexity terminal to determine the initial bandwidth portion is required.

In the following, a low complexity terminal may be a terminal supporting a bandwidth of less than 20 MHz in a serving cell of FR1, and may be a terminal supporting a bandwidth of less than 100 MHz in a serving cell of FR2.

If the low complexity terminal is not provided with the setting for the initial bandwidth part common to the terminal or dedicated to the low complexity terminal through initialDownlinkBWP in SIB1 or a new SIB dedicated to the low complexity terminal, the low complexity terminal determines that the initial bandwidth part is used for MIB reception. It is determined that it is the same as the frequency domain of the common control region #0 (702). That is, the initial bandwidth portion will be defined as having the same frequency resource as the frequency resource according to the location and number of consecutive PRBs starting from the PRB of the lowest value of the control region #0 702 and ending with the PRB of the highest value. can

If the bandwidth of the initial bandwidth portion provided to the low complexity terminal by initialDownlinkBWP in SIB1 is greater than 20 MHz in the case of a serving cell in FR1 or greater than 100 MHz in the case of a serving cell in FR2, SIB1 or low complexity terminal dedicated If the initialDownlinkBWP dedicated to the low complexity terminal in the new SIB is not provided, the low complexity terminal determines that the initial bandwidth part is the same as the frequency domain of the common control region #0 702 by MIB reception.

If the bandwidth of the initial bandwidth portion provided to the low complexity terminal by initialDownlinkBWP in SIB1 is greater than 20 MHz in the case of a serving cell in FR1 or greater than 100 MHz in the case of a serving cell in FR2, a new SIB1 or low complexity terminal dedicated If the initialDownlinkBWP dedicated to the low-complexity terminal is provided in the SIB, the initial bandwidth portion may be determined by setting the initial bandwidth portion by the initialDownlinkBWP dedicated to the low-complexity terminal.

If the bandwidth of the initial bandwidth portion provided to the low complexity terminal by initialDownlinkBWP in SIB1 is less than 20 MHz in the case of a serving cell in FR1, or less than 100 MHz in the case of a serving cell in FR2, a new dedicated SIB1 or low complexity terminal If the initialDownlinkBWP dedicated to the low complexity terminal in the SIB is not provided, the initial bandwidth portion may be determined by setting the initial bandwidth portion by the common initialDownlinkBWP provided in the SIB1.

If the bandwidth of the initial bandwidth part provided to the low complexity terminal by initialDownlinkBWP in SIB1 is less than 20 MHz in the case of a serving cell in FR1 and less than 100 MHz in the case of a serving cell in FR2, SIB1 or a new SIB dedicated to low complexity terminal If the initialDownlinkBWP dedicated to the low complexity terminal in is provided, the initial bandwidth part may be determined by setting the initial bandwidth part by the initialDownlinkBWP dedicated to the low complexity terminal.

The initialDownlinkBWP means initial bandwidth portion setting information dedicated to the low complexity terminal, and the method can be applied even when it is transmitted to the low complexity terminal by means other than SIB1 or a new SIB dedicated to the low complexity terminal.

Next, according to the method proposed above, the low-complexity UE monitors the control region #0 in the initial bandwidth dedicated to the low-complexity UE or assumes to receive the PDCCH within the control region #0. ) to be suggested.

As a first method, the low complexity terminal receives the PDCCH in the control region #0 dedicated to the low complexity terminal and the PDSCH scheduled by the PDCCH, and the DM-RS associated with the PDSCH reception corresponding to the DM-RS antenna port associated with the PDCCH reception. The RS antenna port is related to the common control region #0 received by the low complexity terminal or the synchronization signal block received during initial cell access, and at least one of the average gain, QCL-TypeA, and QCL-TypeD. It can be assumed that it is QCL. This method can be applied when the control region #0 dedicated to the low complexity terminal and the common control region #0 are located in the same resource in the time domain.

As a second method, in order for the low complexity terminal to receive the PDCCH in the control region #0 dedicated to the low complexity terminal and the PDSCH scheduled on the PDCCH, usable QCL information is included in SIB1 or the SIB dedicated to the low complexity terminal and received. can The QCL information may include a specific serving cell ID, an index of an SSB received from the serving cell, and a qcl type (one of typeA, typeB, typeC, and typeD).

As a third method, when the control region #0 dedicated to the low complexity terminal is located in a time resource different from the common control region #0, the low complexity terminal is located in a different frequency domain of the time resource of the control region #0 dedicated to the low complexity terminal. It is assumed that there is an additional synchronization signal block and thus the low complexity terminal has received the synchronization signal block. Alternatively, at least one piece of time, frequency, and cell ID information for receiving the additional synchronization signal block may be included in SIB1 or a SIB dedicated to low complexity terminals. In this case, the terminal can receive an additional synchronization signal block based on the information. The additional synchronization signal block may be a synchronization signal block different from the synchronization signal block received by the low complexity terminal when initially accessing the cell. Cell IDs indicated by the two synchronization signal blocks may be the same, and indexes of the two synchronization signal blocks may be different. The low complexity terminal receives the PDCCH in the control region #0 dedicated to the low complexity terminal and the PDSCH scheduled by the PDCCH, the DM-RS antenna port associated with the PDCCH reception and the DM-RS antenna port associated with the corresponding PDSCH reception. It can be assumed that is QCL in relation to the additional synchronization signal block received by the low complexity terminal and at least one property of average gain, QCL-TypeA, and QCL-TypeD. If an additional synchronization signal block does not exist in the time resource, or the low complexity terminal does not receive the additional synchronization signal block, or the SIB1 or the SIB dedicated to the low complexity terminal receives the additional synchronization signal block If no information is included, the first option can be applied.

In the fourth scheme, it is assumed that the synchronization signal block can always be transmitted within the initial bandwidth portion dedicated to the low complexity terminal, and the low complexity terminal can receive the additional synchronization signal block. Alternatively, at least one piece of time, frequency, and cell ID information for receiving the additional synchronization signal block may be included in SIB1 or a SIB dedicated to low complexity terminals. In this case, the additional synchronization signal block may be different from the synchronization signal block already received by the low complexity terminal because it exists within a common initial bandwidth portion. Cell IDs indicated by the two synchronization signal blocks may be the same, and indexes of the two synchronization signal blocks may be different. The low complexity terminal receives the PDCCH in the control region #0 dedicated to the low complexity terminal and the PDSCH scheduled by the PDCCH, the DM-RS antenna port associated with the PDCCH reception and the DM-RS antenna port associated with the corresponding PDSCH reception. It can be assumed that is QCL in relation to the additional synchronization signal block received by the low complexity terminal and at least one property of average gain, QCL-TypeA, and QCL-TypeD. If the additional synchronization signal block does not exist or the low complexity terminal does not receive the additional synchronization signal block, the SIB1 or the SIB dedicated to the low complexity terminal includes information for receiving the additional synchronization signal block. If not, the first option can be applied.

8 is a diagram illustrating a low complexity terminal procedure in a wireless communication system according to an embodiment of the present disclosure.

In step 901 of FIG. 8, the low complexity terminal receives information necessary for receiving a common initial bandwidth portion and control region #0, an initial bandwidth portion dedicated to the low complexity terminal and a control region #0 from the base station, and information for random access of the low complexity terminal. , TDD or FDD cell information, resource information for configuration-based downlink signals or configuration-based uplink signals, and at least one of full-duplex communication or half-duplex communication configuration information is received. The configuration information may be provided to the terminal through SIB or RRC information or DCI. In addition, the low complexity terminal transmits capability information of the low complexity terminal including whether full-duplex communication or half-duplex communication is supported to the base station. In step 802, the low complexity terminal determines a common initial bandwidth portion and control region #0, and an initial bandwidth portion dedicated to the low complexity terminal and control region #0 according to embodiments of the present invention based on the information received from the base station. Information is received to receive PDCCH and PDSCH in the initial bandwidth portion dedicated to the low complexity terminal and control region #0.

9 is a diagram illustrating a base station procedure in a wireless communication system according to an embodiment of the present disclosure. In step 901 of FIG. 9, the base station provides information required to receive the initial bandwidth portion and control region #0 common to the low complexity UE, the initial bandwidth portion dedicated to the low complexity UE and the control region #0, and information for random access to the low complexity UE. , TDD or FDD cell information, resource information for a configuration-based downlink signal or configuration-based uplink signal, and at least one of full-duplex communication or half-duplex communication configuration information is transmitted. The configuration information may be provided to the terminal through SIB or RRC information or DCI. In addition, the base station transmits information on a common initial bandwidth portion and control region #0, and an initial bandwidth portion dedicated to low complexity terminals and control region #0 according to embodiments of the present invention, and in step 902, PDCCH and PDSCH may be transmitted in the initial bandwidth portion of and control region #0.

10 is a block diagram illustrating a configuration of a low complexity terminal or a general terminal performing an operation according to an embodiment of the present disclosure.

Referring to FIG. 10 , a terminal 1000 may include a transceiver 1010, a processor 1020, and a memory 1030. As described above with reference to FIGS. 1 to 6 , the terminal 1000 according to the present disclosure may operate according to the method described in the embodiments of FIG. 7 in a wireless communication system to which the present disclosure is applied. However, components of the terminal 1000 according to an embodiment are not limited to the above-described example. According to another embodiment, the terminal 1000 may include more elements than the above-mentioned elements, or may include fewer elements in the case of a low complexity terminal. In addition, in a specific case, the transceiver 1010, the processor 1020, and the memory 1030 may be implemented as a single chip.

The transceiver 1010 may include a transmitter and a receiver according to another embodiment. The transceiver 1010 may transmit and receive signals to and from the base station. The signal may include control information and data. To this end, the transceiver 1010 may include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that amplifies a received signal with low noise and down-converts its frequency. In addition, the transceiver 1010 may receive a signal through a wireless channel, output it to the processor 1020, and transmit the signal output from the processor 1020 through a wireless channel.

The processor 1020 may control a series of processes in which the terminal 1000 may operate according to the above-described embodiment of the present disclosure.

The memory 1030 may store control information or data such as transmission resource settings included in a signal obtained from the terminal 1000, and data necessary for controlling the processor 1020 and data generated when controlling the processor 1020. It may have an area for storing etc.

11 is a block diagram showing the configuration of a base station performing an operation according to an embodiment of the present disclosure.

Referring to FIG. 11 , a base station 1100 may include a transceiver 1110, a processor 1120, and a memory 1130. As described in FIGS. 1 to 6 , the base station 1100 according to the present disclosure may operate according to the method described in the embodiments of FIG. 7 in a wireless communication system to which the present disclosure is applied. However, components of the base station 1100 according to an embodiment are not limited to the above example. According to another embodiment, the base station 1100 may include more or fewer components than the aforementioned components. In addition, in a specific case, the transceiver 1110, the processor 1120, and the memory 1130 may be implemented as a single chip. The transceiver 1110 may include a transmitter and a receiver according to another embodiment. The transceiver 1110 may transmit and receive signals to and from the terminal. The signal may include control information and data. To this end, the transceiver 1110 may include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that amplifies a received signal with low noise and down-converts its frequency. In addition, the transceiver 1110 may receive a signal through a wireless channel, output it to the processor 1120, and transmit the signal output from the processor 1120 through a wireless channel.

The processor 1120 may control a series of processes so that the base station 1100 can operate according to the above-described embodiment of the present disclosure. The memory 1130 may store control information and data such as transmission resource settings determined by the base station 1100 or control information and data received from the terminal, and may store data required for control by the processor 1120 and control by the processor 1120. It may have an area for storing data generated at the time of writing.

On the other hand, the embodiments of the present disclosure disclosed in the present specification and drawings are only presented as specific examples to easily explain the technical content of the present disclosure and help understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is obvious to those skilled in the art that other modifications based on the technical idea of the present disclosure are possible. In addition, each of the above embodiments may be operated in combination with each other as needed.

Claims (1)

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

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