KR20230151897A - Method and apparatus for relaying radio signal in a wireless network - Google Patents

Abstract

The present embodiments relate to a method and device for relaying signals in a wireless network, and include a method for a base station to control the relay of wireless signals, setting a beam index for the beam of the repeater used for communication between the repeater and the terminal. Step, configuring side control information for beam control of the repeater based on the beam index, and transmitting the side control information to the repeater, wherein the side control information is divided into semi-static beam indication information and dynamic beam indication information. Provides a way to differentiate.

Description

Method and device for relaying wireless signals in a wireless network {METHOD AND APPARATUS FOR RELAYING RADIO SIGNAL IN A WIRELESS NETWORK}

These embodiments propose a method and device for relaying wireless signals in a next-generation wireless access network (hereinafter referred to as “NR [New Radio]”).

3GPP recently approved "Study on New Radio Access Technology", a study item for research on next-generation radio access technology (in other words, 5G radio access technology), and based on this, RAN WG1 each developed a study item for NR (New Radio). Design of frame structure, channel coding & modulation, waveform & multiple access scheme, etc. is in progress. NR is required to be designed to satisfy not only an improved data transmission rate compared to LTE, but also various QoS requirements required for each detailed and specific usage scenario.

As representative usage scenarios of NR, eMBB (enhancement Mobile BroadBand), mMTC (massive Machine Type Communication), and URLLC (Ultra Reliable and Low Latency Communications) have been defined, and a flexible frame structure compared to LTE is used to meet the needs of each usage scenario. A design is required.

Since each service requirement (usage scenario) has different requirements for data rates, latency, reliability, coverage, etc., it can be used through the frequency band that makes up an arbitrary NR system. Based on different numerologies (e.g., subcarrier spacing, subframe, TTI (Transmission Time Interval), etc.) as a method to efficiently satisfy the needs of each usage scenario. There is a need for a method of efficiently multiplexing radio resource units.

As part of this aspect, when applying a repeater to expand wireless coverage in a wireless network, a specific design is needed to relay wireless signals more efficiently.

Embodiments of the present disclosure can provide a method and device for relaying wireless signals in a wireless network in NR.

In one aspect, the present embodiments provide a method for a base station to control the relay of a wireless signal, including setting a beam index for a beam of a repeater used for communication between a repeater and a terminal, based on the beam index. It includes configuring side control information for beam control of the repeater and transmitting the side control information to the repeater, where the side control information includes semi-static beam indication information and dynamic A method of distinguishing by (dynamic) beam direction information can be provided.

In another aspect, the present embodiments provide a method for a repeater to relay a wireless signal, including transmitting information about the beam of the repeater that can support communication between the repeater and the terminal, based on the beam index for the beam of the repeater. Receiving side control information for beam control of the configured repeater and transmitting and receiving data to and from a terminal based on the side control information, wherein the side control information is a semi-static beam A method of distinguishing between indication information and dynamic beam indication information may be provided.

In another aspect, the present embodiments include a base station that controls the relay of wireless signals, a transmitter, a receiver, and a control unit that controls the operation of the transmitter and the receiver, and the control unit is a repeater used for communication between the repeater and the terminal. Set the beam index for the beam, configure side control information for beam control of the repeater based on the beam index, transmit the side control information to the repeater, and the side control information is, It is possible to provide a base station divided into semi-static beam indication information and dynamic beam indication information.

In another aspect, the present embodiments include a transmitter, a receiver, and a control unit that controls the operation of the transmitter and the receiver in a repeater that relays wireless signals, and the control unit is a repeater capable of supporting communication between the repeater and the terminal. Transmits information about the beam, receives side control information for beam control of the repeater configured based on the beam index for the beam of the repeater, transmits and receives data to and from the terminal based on the side control information, and transmits and receives side control information to the terminal based on the side control information. Control information may be provided to a repeater divided into semi-static beam indication information and dynamic beam indication information.

According to the present embodiments, it is possible to provide a method and device for relaying wireless signals in a wireless network in NR.

Figure 1 is a diagram briefly illustrating the structure of an NR wireless communication system to which this embodiment can be applied.
Figure 2 is a diagram for explaining the frame structure in an NR system to which this embodiment can be applied.
FIG. 3 is a diagram illustrating a resource grid supported by wireless access technology to which this embodiment can be applied.
Figure 4 is a diagram for explaining the bandwidth part supported by the wireless access technology to which this embodiment can be applied.
Figure 5 is a diagram illustrating a synchronization signal block in a wireless access technology to which this embodiment can be applied.
Figure 6 is a diagram for explaining a random access procedure in wireless access technology to which this embodiment can be applied.
Figure 7 is a diagram to explain CORESET.
FIG. 8 is a diagram illustrating an example of symbol level alignment among different SCSs to which this embodiment can be applied.
Figure 9 is a diagram showing a conceptual example of a bandwidth part to which this embodiment can be applied.
FIG. 10 is a diagram illustrating a procedure in which a base station controls relaying of wireless signals according to an embodiment.
FIG. 11 is a diagram illustrating a procedure in which a repeater performs relay of wireless signals according to an embodiment.
Figure 12 is a diagram to explain controlling the relay of wireless signals performed by a repeater between a base station and a terminal according to this embodiment.
Figure 13 is a diagram showing the configuration of a base station according to another embodiment.
Figure 14 is a diagram showing the configuration of a relay according to another embodiment.

Hereinafter, some embodiments of the present disclosure will be described in detail with reference to illustrative drawings. In adding reference numerals to components in each drawing, the same components may have the same reference numerals as much as possible even if they are shown in different drawings. Additionally, in describing the present embodiments, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present technical idea, the detailed description may be omitted. When “comprises,” “has,” “consists of,” etc. mentioned in the specification are used, other parts may be added unless “only” is used. When a component is expressed in the singular, it can also include the plural, unless specifically stated otherwise.

Additionally, in describing the components of the present disclosure, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, order, or number of the components are not limited by the term.

In the description of the positional relationship of components, when two or more components are described as being “connected,” “coupled,” or “connected,” the two or more components are directly “connected,” “coupled,” or “connected.” However, it should be understood that two or more components and other components may be further “interposed” and “connected,” “combined,” or “connected.” Here, other components may be included in one or more of two or more components that are “connected,” “coupled,” or “connected” to each other.

In the description of temporal flow relationships related to components, operation methods, production methods, etc., for example, temporal precedence relationships such as “after”, “after”, “after”, “before”, etc. Or, when a sequential relationship is described, non-continuous cases may be included unless “immediately” or “directly” is used.

On the other hand, when a numerical value or corresponding information (e.g., level, etc.) for a component is mentioned, even if there is no separate explicit description, the numerical value or corresponding information is related to various factors (e.g., process factors, internal or external shocks, It can be interpreted as including the error range that may occur due to noise, etc.).

The wireless communication system in this specification refers to a system for providing various communication services such as voice and data packets using wireless resources, and may include a terminal, a base station, or a core network.

The present embodiments disclosed below can be applied to wireless communication systems using various wireless access technologies. For example, the present embodiments include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single carrier frequency division multiple access (SC-FDMA). Alternatively, it can be applied to various wireless access technologies such as NOMA (non-orthogonal multiple access). In addition, wireless access technology not only refers to a specific access technology, but also refers to communication technology for each generation established by various communication consultative organizations such as 3GPP, 3GPP2, WiFi, Bluetooth, IEEE, and ITU. For example, CDMA can be implemented as a wireless technology such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA may be implemented with wireless technologies such as global system for mobile communications (GSM)/general packet radio service (GPRS)/enhanced data rates for GSM evolution (EDGE). OFDMA can be implemented with wireless technologies such as IEEE (institute of electrical and electronics engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (evolved UTRA), etc. IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e. UTRA is part of the universal mobile telecommunications system (UMTS). 3GPP (3rd generation partnership project) LTE (long term evolution) is a part of E-UMTS (evolved UMTS) that uses E-UTRA (evolved-UMTS terrestrial radio access), employing OFDMA in the downlink and SC- in the uplink. FDMA is adopted. In this way, the present embodiments can be applied to wireless access technologies currently disclosed or commercialized, and can also be applied to wireless access technologies currently under development or to be developed in the future.

Meanwhile, the terminal in this specification is a comprehensive concept meaning a device including a wireless communication module that communicates with a base station in a wireless communication system, and is used in WCDMA, LTE, NR, HSPA, and IMT-2020 (5G or New Radio), etc. It should be interpreted as a concept that includes not only UE (User Equipment), but also MS (Mobile Station), UT (User Terminal), SS (Subscriber Station), and wireless devices in GSM. In addition, a terminal may be a user portable device such as a smart phone depending on the type of use, and in a V2X communication system, it may mean a vehicle, a device including a wireless communication module within the vehicle, etc. Additionally, in the case of a machine type communication system, it may mean an MTC terminal, M2M terminal, URLLC terminal, etc. equipped with a communication module to perform machine type communication.

The base station or cell in this specification refers to an end point that communicates with a terminal in terms of a network, and includes Node-B (Node-B), evolved Node-B (eNB), gNode-B (gNB), Low Power Node (LPN), Sector, site, various types of antennas, BTS (Base Transceiver System), access point, point (e.g. transmission point, reception point, transmission/reception point), relay node ), mega cell, macro cell, micro cell, pico cell, femto cell, RRH (Remote Radio Head), RU (Radio Unit), and small cell. Additionally, a cell may mean including a bandwidth part (BWP) in the frequency domain. For example, a serving cell may mean the UE's Activation BWP.

Since the various cells listed above have a base station that controls one or more cells, base station can be interpreted in two ways. 1) It may be the device itself that provides mega cells, macro cells, micro cells, pico cells, femto cells, and small cells in relation to the wireless area, or 2) it may indicate the wireless area itself. In 1), all devices providing a predetermined wireless area are controlled by the same entity or all devices that interact to collaboratively configure the wireless area are directed to the base station. Depending on how the wireless area is configured, a point, transmission/reception point, transmission point, reception point, etc. become an example of a base station. In 2), the wireless area itself where signals are received or transmitted from the user terminal's perspective or the neighboring base station's perspective may be indicated to the base station.

In this specification, a cell refers to the coverage of a signal transmitted from a transmission/reception point, a component carrier having coverage of a signal transmitted from a transmission point or transmission/reception point, or the transmission/reception point itself. You can.

Uplink (UL, or uplink) refers to a method of transmitting and receiving data from a terminal to a base station, and downlink (Downlink, DL, or downlink) refers to a method of transmitting and receiving data from a base station to a terminal. do. Downlink may refer to communication or a communication path from multiple transmission/reception points to a terminal, and uplink may refer to communication or a communication path from a terminal to multiple transmission/reception points. At this time, in the downlink, the transmitter may be part of a multiple transmission/reception point, and the receiver may be part of the terminal. Additionally, in the uplink, a transmitter may be part of a terminal, and a receiver may be part of a multiple transmission/reception point.

Uplink and downlink transmit and receive control information through control channels such as PDCCH (Physical Downlink Control CHannel) and PUCCH (Physical Uplink Control CHannel), and PDSCH (Physical Downlink Shared CHannel), PUSCH (Physical Uplink Shared CHannel), etc. Data is transmitted and received by configuring the same data channel. Hereinafter, the situation in which signals are transmitted and received through channels such as PUCCH, PUSCH, PDCCH, and PDSCH is sometimes expressed as 'transmitting and receiving PUCCH, PUSCH, PDCCH, and PDSCH.'

For clarity of explanation, the technical idea below is mainly described in the 3GPP LTE/LTE-A/NR (New RAT) communication system, but the technical features are not limited to the corresponding communication system.

Following research on 4G (4th-Generation) communication technology, 3GPP develops 5G (5th-Generation) communication technology to meet the requirements of ITU-R's next-generation wireless access technology. Specifically, 3GPP develops LTE-A pro, which is a 5G communication technology that improves LTE-Advanced technology to meet the requirements of ITU-R, and a new NR communication technology that is separate from 4G communication technology. Both LTE-A pro and NR refer to 5G communication technology, and hereinafter, 5G communication technology will be explained focusing on NR in cases where a specific communication technology is not specified.

The operating scenario in NR defines a variety of operating scenarios by adding consideration of satellites, automobiles, and new verticals to the existing 4G LTE scenario, and in terms of service, the eMBB (Enhanced Mobile Broadband) scenario has a high terminal density but is wide. It is deployed in a wide range of applications, supporting mMTC (Massive Machine Communication) scenarios that require low data rates and asynchronous connections, and URLLC (Ultra Reliability and Low Latency) scenarios that require high responsiveness and reliability and can support high-speed mobility. .

To satisfy this scenario, NR is launching a wireless communication system with new waveform and frame structure technology, low latency technology, ultra-high frequency band (mmWave) support technology, and forward compatible technology. In particular, the NR system proposes various technical changes in terms of flexibility to provide forward compatibility. The main technical features of NR are explained below with reference to the drawings.

<NR system general>

Figure 1 is a diagram briefly illustrating the structure of an NR system to which this embodiment can be applied.

Referring to Figure 1, the NR system is divided into 5GC (5G Core Network) and NR-RAN parts, and NG-RAN controls the user plane (SDAP/PDCP/RLC/MAC/PHY) and UE (User Equipment). It consists of gNBs and ng-eNBs that provide planar (RRC) protocol termination. gNB interconnection or gNB and ng-eNB are interconnected through the Xn interface. gNB and ng-eNB are each connected to 5GC through the NG interface. 5GC may be composed of an Access and Mobility Management Function (AMF), which is responsible for the control plane such as terminal access and mobility control functions, and a User Plane Function (UPF), which is responsible for controlling user data. NR includes support for both the frequency band below 6 GHz (FR1, Frequency Range 1) and the frequency band above 6 GHz (FR2, Frequency Range 2).

gNB refers to a base station that provides NR user plane and control plane protocol termination to the terminal, and ng-eNB refers to a base station that provides E-UTRA user plane and control plane protocol termination to the terminal. The base station described in this specification should be understood to encompass gNB and ng-eNB, and may be used to refer to gNB or ng-eNB separately, if necessary.

<NR wave form, numerology and frame structure>

In NR, the CP-OFDM wave form using a cyclic prefix is used for downlink transmission, and CP-OFDM or DFT-s-OFDM is used for uplink transmission. OFDM technology is easy to combine with MIMO (Multiple Input Multiple Output) and has the advantage of being able to use a low-complexity receiver with high frequency efficiency.

Meanwhile, in NR, the requirements for data rate, delay rate, coverage, etc. are different for each of the three scenarios described above, so it is necessary to efficiently satisfy the requirements for each scenario through the frequency band that constitutes an arbitrary NR system. . To this end, a technology for efficiently multiplexing wireless resources based on a plurality of different numerologies has been proposed.

Specifically, the NR transmission numerology is determined based on sub-carrier spacing and CP (Cyclic prefix), and as shown in Table 1 below, the μ value is used as an exponent value of 2 based on 15 kHz to obtain the exponent. changes into an enemy.

μ Subcarrier spacing Cyclic prefix Supported for data Supported for synchronization 0 15 Normal Yes Yes One 30 Normal Yes Yes 2 60 Normal, Extended Yes No 3 120 Normal Yes Yes 4 240 Normal No Yes

As shown in Table 1 above, NR's numerology can be divided into five types depending on the subcarrier spacing. This is different from the subcarrier spacing of LTE, one of the 4G communication technologies, which is fixed at 15 kHz. Specifically, the subcarrier intervals used for data transmission in NR are 15, 30, 60, and 120 kHz, and the subcarrier intervals used for synchronization signal transmission are 15, 30, 12, and 240 kHz. Additionally, the extended CP applies only to the 60 kHz subcarrier spacing. Meanwhile, the frame structure in NR is defined as a frame with a length of 10ms consisting of 10 subframes with the same length of 1ms. One frame can be divided into half-frames of 5ms, and each half-frame contains 5 subframes. In the case of 15 kHz subcarrier spacing, one subframe consists of one slot, and each slot consists of 14 OFDM symbols. Figure 2 is a diagram for explaining the frame structure in an NR system to which this embodiment can be applied.

Referring to FIG. 2, a slot is fixedly composed of 14 OFDM symbols in the case of normal CP, but the length of the slot in the time domain may vary depending on the subcarrier spacing. For example, in the case of numerology with a 15 kHz subcarrier spacing, a slot is 1ms long and has the same length as a subframe. In contrast, in the case of numerology with a 30 kHz subcarrier spacing, a slot consists of 14 OFDM symbols, but two slots can be included in one subframe with a length of 0.5 ms. That is, subframes and frames are defined with a fixed time length, and slots are defined by the number of symbols, so the time length may vary depending on the subcarrier interval.

Meanwhile, NR defines the basic unit of scheduling as a slot, and also introduces a mini-slot (or sub-slot or non-slot based schedule) to reduce transmission delay in the wireless section. When a wide subcarrier spacing is used, the length of one slot is shortened in inverse proportion, so transmission delay in the wireless section can be reduced. Mini-slots (or sub-slots) are designed to efficiently support URLLC scenarios and can be scheduled in units of 2, 4, or 7 symbols.

Additionally, unlike LTE, NR defines uplink and downlink resource allocation at the symbol level within one slot. In order to reduce HARQ delay, a slot structure that can transmit HARQ ACK/NACK directly within the transmission slot has been defined, and this slot structure is described as a self-contained structure.

NR is designed to support a total of 256 slot formats, of which 62 slot formats are used in 3GPP Rel-15. In addition, it supports a common frame structure that forms an FDD or TDD frame through a combination of various slots. For example, a slot structure in which all slot symbols are set to downlink, a slot structure in which all symbols are set to uplink, and a slot structure in which downlink symbols and uplink symbols are combined are supported. Additionally, NR supports scheduling data transmission distributed over one or more slots. Therefore, the base station can use a slot format indicator (SFI) to inform the terminal whether the slot is a downlink slot, an uplink slot, or a flexible slot. The base station can indicate the slot format by indicating the index of the table configured through UE-specific RRC signaling using SFI, and can indicate it dynamically through DCI (Downlink Control Information) or statically or through RRC. It can also be indicated semi-statically.

<NR physical resources>

Regarding physical resources in NR, antenna port, resource grid, resource element, resource block, bandwidth part, etc. are considered. do.

An antenna port is defined so that a channel carrying a symbol on the antenna port can be inferred from a channel carrying another symbol on the same antenna port. If the large-scale properties of the channel carrying the symbols on one antenna port can be inferred from the channel carrying the symbols on the other antenna port, then the two antenna ports are quasi co-located or QC/QCL. It can be said that they are in a quasi co-location relationship. Here, the wide range characteristics include one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.

FIG. 3 is a diagram illustrating a resource grid supported by wireless access technology to which this embodiment can be applied.

Referring to FIG. 3, since NR supports multiple numerology on the same carrier, a resource grid may exist for each numerology. Additionally, resource grids may exist depending on antenna ports, subcarrier spacing, and transmission direction.

A resource block consists of 12 subcarriers and is defined only in the frequency domain. Additionally, a resource element consists of one OFDM symbol and one subcarrier. Therefore, as shown in FIG. 3, the size of one resource block may vary depending on the subcarrier spacing. Additionally, NR defines "Point A", which serves as a common reference point for the resource block grid, common resource blocks, virtual resource blocks, etc.

Figure 4 is a diagram for explaining the bandwidth part supported by the wireless access technology to which this embodiment can be applied.

In NR, unlike LTE, where the carrier bandwidth is fixed at 20Mhz, the maximum carrier bandwidth is set from 50Mhz to 400Mhz for each subcarrier interval. Therefore, it is not assumed that all terminals use all of these carrier bandwidths. Accordingly, in NR, the terminal can use a designated bandwidth part (BWP) within the carrier bandwidth as shown in FIG. 4. Additionally, the bandwidth part is linked to one numerology and consists of a subset of consecutive common resource blocks, and can be activated dynamically over time. The terminal is configured with up to four bandwidth parts for each uplink and downlink, and data is transmitted and received using the bandwidth parts activated at a given time.

In the case of a paired spectrum, the uplink and downlink bandwidth parts are set independently, and in the case of an unpaired spectrum, to prevent unnecessary frequency re-tunning between downlink and uplink operations. For this purpose, the bandwidth parts of the downlink and uplink are set in pairs so that they can share the center frequency.

<NR initial access>

In NR, the terminal performs cell search and random access procedures to connect to the base station and perform communication.

Cell search is a procedure in which the terminal synchronizes to the cell of the base station, obtains a physical layer cell ID, and obtains system information using a synchronization signal block (SSB) transmitted by the base station.

Figure 5 is a diagram illustrating a synchronization signal block in a wireless access technology to which this embodiment can be applied.

Referring to FIG. 5, the SSB is composed of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), each occupying 1 symbol and 127 subcarriers, and a PBCH spanning 3 OFDM symbols and 240 subcarriers.

The terminal monitors the SSB in the time and frequency domains and receives the SSB.

SSB can be transmitted up to 64 times in 5ms. Multiple SSBs are transmitted through different transmission beams within 5ms, and the terminal performs detection assuming that SSBs are transmitted every 20ms period based on one specific beam used for transmission. The number of beams that can be used for SSB transmission within 5ms time can increase as the frequency band becomes higher. For example, up to 4 different SSB beams can be transmitted under 3 GHz, up to 8 different beams can be used in the frequency band from 3 to 6 GHz, and up to 64 different beams can be used in the frequency band above 6 GHz.

Two SSBs are included in one slot, and the start symbol and number of repetitions within the slot are determined according to the subcarrier spacing as follows.

Meanwhile, unlike SS in conventional LTE, SSB is not transmitted at the center frequency of the carrier bandwidth. In other words, SSBs can be transmitted even in places other than the center of the system band, and when broadband operation is supported, multiple SSBs can be transmitted in the frequency domain. Accordingly, the terminal monitors the SSB using a synchronization raster, which is a candidate frequency location for monitoring the SSB. The carrier raster and synchronization raster, which are the center frequency location information of the channel for initial access, have been newly defined in NR, and the synchronization raster has a wider frequency interval than the carrier raster, supporting fast SSB search of the terminal. You can.

The UE can obtain the MIB through the PBCH of the SSB. MIB (Master Information Block) contains the minimum information for the terminal to receive the remaining system information (RMSI, Remaining Minimum System Information) broadcast by the network. In addition, the PBCH includes information about the location of the first DM-RS symbol in the time domain, information for the terminal to monitor SIB1 (e.g., SIB1 numerology information, information related to SIB1 CORESET, search space information, PDCCH (related parameter information, etc.), offset information between the common resource block and the SSB (the position of the absolute SSB within the carrier is transmitted through SIB1), etc. Here, the SIB1 numerology information is equally applied to some messages used in the random access procedure for accessing the base station after the terminal completes the cell search procedure. For example, numerology information of SIB1 may be applied to at least one of messages 1 to 4 for the random access procedure.

The above-mentioned RMSI may mean SIB1 (System Information Block 1), and SIB1 is broadcast periodically (ex, 160ms) in the cell. SIB1 contains information necessary for the terminal to perform the initial random access procedure and is transmitted periodically through PDSCH. In order for the terminal to receive SIB1, it must receive numerology information used for SIB1 transmission and CORESET (Control Resource Set) information used for scheduling SIB1 through the PBCH. The UE uses SI-RNTI in CORESET to check scheduling information for SIB1 and acquires SIB1 on the PDSCH according to the scheduling information. Except for SIB1, the remaining SIBs may be transmitted periodically or according to the request of the terminal.

Figure 6 is a diagram for explaining a random access procedure in wireless access technology to which this embodiment can be applied.

Referring to FIG. 6, when cell search is completed, the terminal transmits a random access preamble for random access to the base station. The random access preamble is transmitted through PRACH. Specifically, the random access preamble is transmitted to the base station through PRACH, which consists of continuous radio resources in a specific slot that is repeated periodically. Generally, when a UE initially accesses a cell, a contention-based random access procedure is performed, and when random access is performed for beam failure recovery (BFR), a non-contention-based random access procedure is performed.

The terminal receives a random access response to the transmitted random access preamble. The random access response may include a random access preamble identifier (ID), UL Grant (uplink radio resource), temporary C-RNTI (Temporary Cell - Radio Network Temporary Identifier), and TAC (Time Alignment Command). Since one random access response may include random access response information for one or more terminals, the random access preamble identifier may be included to indicate to which terminal the included UL Grant, temporary C-RNTI, and TAC are valid. The random access preamble identifier may be an identifier for the random access preamble received by the base station. TAC may be included as information for the terminal to adjust uplink synchronization. The random access response may be indicated by a random access identifier on the PDCCH, that is, RA-RNTI (Random Access - Radio Network Temporary Identifier).

The terminal that has received a valid random access response processes the information included in the random access response and performs scheduled transmission to the base station. For example, the terminal applies TAC and stores temporary C-RNTI. Additionally, using the UL Grant, data stored in the terminal's buffer or newly created data is transmitted to the base station. In this case, information that can identify the terminal must be included.

Finally, the terminal receives a downlink message to resolve contention.

<NR CORESET>

The downlink control channel in NR is transmitted in CORESET (Control Resource Set) with a length of 1 to 3 symbols, and transmits uplink/downlink scheduling information, SFI (Slot format Index), and TPC (Transmit Power Control) information. .

In this way, in order to secure the flexibility of the system, NR introduced the CORESET concept. CORESET (Control Resource Set) refers to time-frequency resources for downlink control signals. The terminal may decode the control channel candidate using one or more search spaces in the CORESET time-frequency resource. QCL (Quasi CoLocation) assumptions were set for each CORESET, and this is used for the purpose of informing the characteristics of the analog beam direction in addition to the delay spread, Doppler spread, Doppler shift, and average delay, which are the characteristics assumed by the conventional QCL.

Figure 7 is a diagram to explain CORESET.

Referring to FIG. 7, CORESET may exist in various forms within one slot and within the carrier bandwidth, and in the time domain, CORESET may be composed of up to three OFDM symbols. Additionally, CORESET is defined as a multiple of 6 resource blocks from the frequency domain to the carrier bandwidth.

The first CORESET is directed through the MIB as part of the initial bandwidth part configuration to enable it to receive additional configuration and system information from the network. After establishing a connection with the base station, the terminal can receive and configure one or more CORESET information through RRC signaling.

In this specification, frequencies, frames, subframes, resources, resource blocks, regions, bands, subbands, control channels, data channels, synchronization signals, various reference signals, various signals, or various messages related to NR (New Radio) can be interpreted in a variety of meanings that may be used in the past or present, or may be used in the future.

NR(New Radio)

NR, which was recently developed in 3GPP, was designed to not only provide improved data transmission rates compared to LTE, but also to satisfy various QoS requirements for each segmented and specific service requirement (usage scenario). In particular, eMBB (enhancement Mobile BroadBand), mMTC (massive Machine Type Communication), and URLLC (Ultra Reliable and Low Latency Communications) were defined as representative service requirements (usage scenarios) of NR, and the requirements for each service requirement (usage scenario) were defined. As a way to satisfy this, a flexible frame structure design compared to LTE/LTE-Advanced is required.

Since each service requirement (usage scenario) has different requirements for data rates, latency, reliability, coverage, etc., the frequencies that make up an arbitrary NR system Radio resource units based on different numerologies (e.g., subcarrier spacing, subframe, TTI, etc.) as a method to efficiently satisfy the needs of each service requirement (usage scenario) through the band. It is designed for efficient multiplexing.

As a method for this, TDM, FDM or TDM/FDM based on one or multiple NR component carrier(s) for numerology with different subcarrier spacing values. There was discussion on how to support multiplexing and how to support more than one time unit when configuring a scheduling unit in the time domain. In this regard, in NR, a subframe has been defined as a type of time domain structure, and reference numerology is used to define the subframe duration. It was decided to define a single subframe duration consisting of 14 OFDM symbols of normal CP overhead based on 15kHz Sub-Carrier Spacing (SCS), which is the same as LTE. Accordingly, in NR, a subframe has a time duration of 1ms. However, unlike LTE, the subframe of NR is an absolute reference time duration, and is a time unit based on actual up/down link data scheduling, including slots and mini-slots. ) can be defined. In this case, the number and y value of OFDM symbols constituting the corresponding slot were determined to have a value of y=14 regardless of the SCS value in the case of normal CP.

Accordingly, any slot consists of 14 symbols, and depending on the transmission direction of the slot, all symbols are used for downlink transmission (DL transmission), or all symbols are used for uplink transmission (UL). It can be used for transmission, or in the form of a downlink portion (DL portion) + gap + uplink portion (UL portion).

In addition, in any numerology (or SCS), a mini-slot consisting of fewer symbols than the slot is defined, and based on this, a short time-domain scheduling interval (time-domain) for transmitting and receiving uplink/downlink data is defined. A scheduling interval may be set, or a long time-domain scheduling interval may be configured for up/downlink data transmission and reception through slot aggregation.

In particular, in the case of transmission and reception of latency critical data such as URLLC, a 1ms (14 symbols) based frame structure defined in numerology with a small SCS value such as 15kHz is used. If scheduling is done on a slot-by-slot basis, it may be difficult to satisfy the latency requirement. Therefore, for this purpose, a mini-slot consisting of fewer OFDM symbols than the corresponding slot is defined and based on this, a critical delay rate such as the URLLC is defined. It can be defined so that scheduling is performed for (latency critical) data.

Or, as described above, by multiplexing and supporting numerology with different SCS values within one NR carrier using the TDM and/or FDM method, each numerology A method of scheduling data according to latency requirements based on the defined slot (or mini-slot) length is also being considered. For example, as shown in Figure 8 below, when the SCS is 60kHz, the symbol length is reduced to about 1/4 compared to the SCS 15kHz, so when one slot is configured with the same 14 OFDM symbols, the 15kHz-based The slot length is 1ms, while the 60kHz-based slot length is reduced to about 0.25ms.

As such, in NR, discussions are underway on how to satisfy the requirements of URLLC and eMBB by defining different SCS or different TTI lengths.

Wider bandwidth operations

In the case of the existing LTE system, scalable bandwidth operation for any LTC CC (Component Carrier) was supported. In other words, depending on the frequency deployment scenario, any LTE operator could configure a bandwidth from a minimum of 1.4 MHz to a maximum of 20 MHz when configuring one LTE CC, and a normal LTE terminal can configure one LTE CC. For CC, transmission and reception capabilities of 20 MHz bandwidth were supported.

However, in the case of NR, the design is made to enable support for NR terminals with different transmission and reception bandwidth capabilities through one wideband NR CC, and accordingly, Figure 9 below and Likewise, one or more bandwidth parts (BWP, bandwidth part(s)) consisting of segmented bandwidths are configured for any NR CC, and flexible (bandwidth part(s)) is configured through different bandwidth part configuration and activation for each terminal. It is required to support flexible wider bandwidth operation.

Specifically, in NR, one or more bandwidth parts can be configured through one serving cell configured from the terminal's perspective, and the terminal can configure one downlink bandwidth part ( It is defined to be used for uplink/downlink data transmission and reception by activating a DL bandwidth part) and one uplink bandwidth part (UL bandwidth part). In addition, when multiple serving cells are configured in the corresponding terminal, that is, for terminals to which CA is applied, one downlink bandwidth part and/or uplink bandwidth part is activated for each serving cell. It was defined to be used for up/down link data transmission and reception using the radio resources of the corresponding serving cell.

Specifically, the initial bandwidth part for the initial access procedure of the terminal is defined in any serving cell, and for each terminal, one or more terminal-specific (UE) signals are provided through dedicated RRC signaling. -specific) bandwidth part(s) may be configured, and a default bandwidth part for fallback operation may be defined for each terminal.

However, in any serving cell, multiple downlink and/or uplink bandwidth parts can be activated and used simultaneously depending on the terminal's capability and bandwidth part(s) configuration. However, in NR rel-15, it is defined to activate and use only one downlink bandwidth part (DL bandwidth part) and one uplink bandwidth part (UL bandwidth part) at any time in any terminal. .

Hereinafter, a method of relaying wireless signals in a wireless network will be specifically described with reference to the related drawings.

FIG. 10 is a diagram illustrating a procedure 1000 in which a base station controls relaying of wireless signals according to an embodiment.

Referring to FIG. 10, the base station can set a beam index for the beam of the repeater used for communication between the repeater and the terminal (S1010).

A repeater receives a signal from a base station or a terminal, amplifies it, and then transmits it. Referring to FIG. 12, the repeater performs amplification and transmission operations for wireless signals between the base station and the terminal through the a link and the b link. Additionally, a c-link may be further configured between the base station and the repeater for control of the repeater. According to one example, link a may be referred to as an access link, link b may be referred to as a backhaul link, link c may be referred to as a control link, etc., but are not limited thereto.

The base station can obtain information about the number of downlink transmission beams and uplink reception beams supported by the repeater. According to one example, information on the number of beams supported by the repeater may be obtained from the repeater through repeater capability signaling. Alternatively, information on the number of beams may be preset for each repeater and stored in the base station.

The base station can set a beam index for each downlink transmission beam or uplink reception beam depending on the number of beams supported by the repeater. For example, when the repeater supports N downlink transmission beams, the base station can set the beam index to 0, 1, 2, ..., N-1 for each beam. Similarly, when the repeater supports M uplink reception beams, the base station can set the beam index to 0, 1, 2, ..., M-1 for each beam. If uplink reception beams are paired with downlink transmission beams, M is the same number as N, and the uplink reception beams are 0, 1, 2, ... corresponding to the paired downlink transmission beams. , the beam index can be set up to N-1.

According to one example, downlink transmission beams supported by the repeater may be set separately according to cast type. For example, downlink transmission beams can be divided into type 1 for broadcast, type 2 for multicast/groupcast, and type 3 for unicast. Alternatively, downlink transmission beams may be divided into type 1 for broadcast/multicast/groupcast and type 2 for unicast. In this case, the base station can set the beam index for each type. For example, beam indices of 0, 1, 2, ..., N-1 can be set in the order from type 1 to type 2 and type 3. Alternatively, a separate beam index may be set from 0 for each type. In this case, type information and beam index information can be used together to indicate each beam.

Or, according to one example, downlink transmission beams and uplink reception beams may be classified according to beamwidth type. For example, when performing secondary sweeping with a narrow beam within a wide beam determined by performing primary sweeping with a wide beam, the base station sets the beam index for each of the wide beam and narrow beam. can be set. In this case, beam width type information and beam index information can be used together in the indication for each beam.

Referring again to FIG. 10, the base station may configure side control information for beam control of the repeater based on the beam index (S1020) and transmit the side control information to the repeater (S1030).

The base station can transmit side control information about the downlink transmission beam or uplink reception beam to the repeater through link c. That is, information about the beams that the repeater will use for signal relay between the base station and the terminal can be indicated through side control information.

The side control information may include beam indication information divided into semi-static beam indication information and dynamic beam indication information. In this case, according to one example, a set of dynamic beams and a set of semi-static beams supported by the repeater may be separately configured and indicated by respective beam indication information.

According to one example, the type of beams according to the above-described cast type may be applied to a set of dynamic beams and a set of semi-static beams. For example, in the case of the above-described type 1 beams for broadcast/multicast/groupcast, a set of semi-static beams may be applied, and in the case of type 2 beams for unicast, a set of dynamic beams may be applied.

However, this is just an example and is not limited to this. According to another example, all downlink transmission beams and uplink reception beams supported by the repeater may be subject to semi-static beam indication information and dynamic beam indication information, respectively, without separate distinction.

According to one example, in the case of dynamic beam indication information, the base station may configure information indicating a downlink transmission beam or an uplink reception beam to be used by the repeater and transmit it through downlink control information (DCI). Along with the beam indication information, the time resource to be used can also be determined from a plurality of time resources pre-configured through higher layer signaling and transmitted through DCI. In this case, according to one example, beam indication information and time resource allocation information may be indicated by different field values within the same DCI.

According to one example, semi-static beam indication information may be divided into periodic beam indication information and semi-persistent beam indication information. The base station may transmit periodic beam indication information or semi-persistent beam indication information to the repeater through higher layer signaling such as RRC signaling. In this case, the semi-static beam indication information may include beam index indication information and time resource allocation information.

Time resource allocation information may include period information, offset information, and duration information. That is, along with period information for which the downlink transmission beam or uplink reception beam is used, offset information for indicating the start slot within one period and the start symbol within the slot, and duration information that can be defined as the number of symbols are time resources. It may be included in allocation information.

The repeater may transmit and receive data with the terminal based on dynamic beam indication information or semi-static beam indication information received from the base station. That is, the repeater can transmit the signal from the base station to the terminal using the downlink transmission beam indicated by the base station. Likewise, a signal from the terminal can be received using an uplink reception beam indicated from the base station.

According to one example, it is assumed that multiple pieces of beam indication information collide in the same time period. In the case of identical beam indication information, for example, between periodic beam indication information or between semi-persistent beam indication information, the periodic information may be configured differently so that there is no room for conflict. If a conflict occurs between dynamic beam indication information, the last dynamic beam indication information may be configured as valid.

If semi-static beam indication information and dynamic beam indication information collide in a predetermined time period, it is necessary to determine priority for the beam indication information. In this case, dynamic beam control information may be configured to have higher priority than semi-static beam control information. That is, when the same beam is dynamically indicated in a time period in which semi-static beam indication information is set, the dynamic beam indication information may be configured to have a higher priority than the semi-static beam indication information.

Additionally, when the periodic beam control information and the semi-persistent beam control information in the semi-static beam control information collide in a predetermined time period, the semi-persistent beam control information may be configured to have higher priority than the periodic beam control information.

When different beam indication information collides in the same time period, the repeater can transmit and receive the corresponding signal using the priority beam according to the above-described priority.

According to this, the beam information that can be used in data transmission and reception between the repeater and the terminal is controlled to use the optimal beam in consideration of various situations such as whether the terminal is connected, location, and channel status, thereby improving the coverage of the repeater and data transmission and reception. Methods and devices that can improve performance can be provided.

FIG. 11 is a diagram illustrating a procedure 1100 in which a repeater performs relay of wireless signals according to an embodiment. The description described above in FIG. 10 may be omitted to avoid redundant description, and in this case, the omitted content may be applied substantially the same to the transmitting terminal as long as it does not conflict with the technical idea of the invention.

Referring to FIG. 11, the repeater can transmit information about the repeater's beam that can support communication between the repeater and the terminal (S1110).

According to one example, the repeater may transmit information on the number of beams it supports to the base station through repeater capability signaling. However, this is just an example, and information on the number of beams may be preset for each repeater and stored in the base station. In this case, step S1110 may be omitted.

Referring again to FIG. 11, the repeater may receive side control information for beam control of the repeater configured based on the beam index for the beam of the repeater (S1120).

As described above, the base station can set a beam index for each downlink transmission beam or uplink reception beam depending on the number of beams supported by the repeater. For example, when the repeater supports N downlink transmission beams, the base station can set the beam index to 0, 1, 2, ..., N-1 for each beam. Similarly, when the repeater supports M uplink reception beams, the base station can set the beam index to 0, 1, 2, ..., M-1 for each beam. If uplink reception beams are paired with downlink transmission beams, M is the same number as N, and the uplink reception beams are 0, 1, 2, ... corresponding to the paired downlink transmission beams. , the beam index can be set up to N-1.

According to one example, downlink transmission beams supported by the repeater may be set separately according to cast type. For example, downlink transmission beams can be divided into type 1 for broadcast, type 2 for multicast/groupcast, and type 3 for unicast. Alternatively, downlink transmission beams may be divided into type 1 for broadcast/multicast/groupcast and type 2 for unicast. In this case, the base station can set the beam index for each type. For example, beam indices of 0, 1, 2, ..., N-1 can be set in the order from type 1 to type 2 and type 3. Alternatively, a separate beam index may be set from 0 for each type. In this case, type information and beam index information can be used together to indicate each beam.

Or, according to one example, downlink transmission beams and uplink reception beams may be classified according to beamwidth type. For example, when performing secondary sweeping with a narrow beam within a wide beam determined by performing primary sweeping with a wide beam, the base station sets the beam index for each of the wide beam and narrow beam. can be set. In this case, beam width type information and beam index information can be used together to indicate each beam.

The repeater may receive side control information for beam control of the repeater configured by the base station based on the beam index. The repeater can receive side control information for the downlink transmission beam or uplink reception beam from the base station through link c. That is, information about the beams that the repeater will use for signal relay between the base station and the terminal can be indicated through side control information.

The side control information may include beam indication information divided into semi-static beam indication information and dynamic beam indication information. In this case, according to one example, a set of dynamic beams and a set of semi-static beams supported by the repeater may be separately configured and indicated by respective beam indication information.

According to one example, the type of beams according to the above-described cast type may be applied to a set of dynamic beams and a set of semi-static beams. For example, in the case of the above-described type 1 beams for broadcast/multicast/groupcast, a set of semi-static beams may be applied, and in the case of type 2 beams for unicast, a set of dynamic beams may be applied.

However, this is just an example and is not limited to this. According to another example, all downlink transmission beams and uplink reception beams supported by the repeater may be subject to semi-static beam indication information and dynamic beam indication information, respectively, without separate distinction.

According to one example, in the case of dynamic beam indication information, the repeater may configure information indicating a downlink transmission beam or an uplink reception beam to be used by the repeater and receive it from the base station through downlink control information (DCI). Along with the beam indication information, the time resource to be used can also be determined from a plurality of time resources pre-configured through higher layer signaling and transmitted through DCI. In this case, according to one example, beam indication information and time resource allocation information may be indicated by different field values within the same DCI.

According to one example, semi-static beam indication information may be divided into periodic beam indication information and semi-persistent beam indication information. The repeater may receive periodic beam indication information or semi-persistent beam indication information from the base station through higher layer signaling such as RRC signaling. In this case, the semi-static beam indication information may include beam index indication information and time resource allocation information.

Time resource allocation information may include period information, offset information, and duration information. That is, along with period information for which the downlink transmission beam or uplink reception beam is used, offset information for indicating the start slot within one period and the start symbol within the slot, and duration information that can be defined as the number of symbols are time resources. It may be included in allocation information.

According to one example, it is assumed that multiple pieces of beam indication information collide in the same time period. In the case of identical beam indication information, for example, between periodic beam indication information or between semi-persistent beam indication information, the periodic information may be configured differently so that there is no room for conflict. If a conflict occurs between dynamic beam indication information, the last dynamic beam indication information may be configured as valid.

If semi-static beam indication information and dynamic beam indication information collide in a predetermined time period, it is necessary to determine priority for the beam indication information. In this case, dynamic beam control information may be configured to have higher priority than semi-static beam control information. That is, when the same beam is dynamically indicated in a time period in which semi-static beam indication information is set, the dynamic beam indication information may be configured to have a higher priority than the semi-static beam indication information.

Additionally, when the periodic beam control information and the semi-persistent beam control information in the semi-static beam control information collide in a predetermined time period, the semi-persistent beam control information may be configured to have higher priority than the periodic beam control information.

Referring again to FIG. 11, the repeater can transmit and receive data with the terminal based on side control information (S1130).

The repeater may transmit and receive data with the terminal based on dynamic beam indication information or semi-static beam indication information received from the base station. That is, the repeater can transmit the signal from the base station to the terminal using the downlink transmission beam indicated by the base station. Likewise, a signal from the terminal can be received using an uplink reception beam indicated from the base station.

Additionally, when different beam indication information collides in the same time period, the repeater can transmit and receive the corresponding signal using the priority beam according to the above-described priority.

According to this, the beam information that can be used in data transmission and reception between the repeater and the terminal is controlled to use the optimal beam in consideration of various situations such as whether the terminal is connected, location, and channel status, thereby improving the coverage of the repeater and data transmission and reception. Methods and devices that can improve performance can be provided.

Hereinafter, each embodiment related to a method of relaying wireless signals in a wireless network will be described in detail with reference to the related drawings.

This disclosure proposes a method for a base station to control a repeater in a wireless mobile communication system. In particular, we propose a method for controlling the downlink transmission beam (DL Tx beam) and uplink reception beam (UL Rx beam) of a repeater at a base station and a method of operating the repeater accordingly.

This disclosure proposes a method for controlling a repeater based on NR (New Radio), that is, 5G technology defined in 3GPP, but the technical idea proposed in this disclosure can be applied to other mobile communication systems such as LTE and 6G to be developed in the future. Even cases where it is applied are included in the scope of the invention according to the present disclosure. In addition, in addition to existing RF repeaters and optical repeaters, the repeater may also include new passive/active types of reflective surfaces such as new metamaterial-based Intelligent Reflecting Surface (IRS) or Reconfigurable Intelligent Surface (RIS), as proposed in this disclosure. The technical idea can be applied to the corresponding IRS/RIS control method.

According to the existing repeater operation for expanding wireless coverage, it was in the form of amplify & forward, in which a signal from a base station or a terminal was received and then simply amplified and transmitted. Accordingly, regardless of whether there is a terminal that actually needs help from the corresponding repeater, the repeater continuously receives the signal from the base station, amplifies it, and transmits it. In other words, for any repeater in a cell configured by a base station, the donor of the repeater is provided without processes such as optimal repeater (analog) Tx beam optimization based on whether a terminal within the coverage of the corresponding repeater is connected, the location/channel status of the connected terminal, etc. The signal from the base station corresponding to the node (donor node) is unconditionally relayed.

This operation not only causes unnecessary energy consumption of the repeater, but also may cause unnecessary interference to other terminals within the cell.

In addition, for any cell/base station operating in a high frequency band, such as 5G's FR2 (Frequency Range 2), a hybrid beamforming method that applies both analog beamforming technology and digital beamforming technology is applied to expand wireless coverage. there is. Accordingly, there is a need to improve the coverage and data transmission and reception performance of the repeater by selecting and transmitting the optimal Tx beam based on the location or channel status of the terminal through analog beamforming.

In this disclosure, when an arbitrary repeater supports one or more analog Tx beams or Rx beams, a method of controlling the Tx beam or Rx beam of the corresponding repeater at the base station is proposed. In particular, the present disclosure uses dynamic beam indication and semi-static (or periodic or semi-persistent) for indicating the DL Tx beam or UL Rx beam of the repeater. We propose two types of beam indication methods and a corresponding repeater operation method.

In the present disclosure, for convenience of explanation, the link between the base station and the repeater for controlling the repeater is referred to as C-link. On the other hand, the link between the repeater and the terminal to perform the original function of the repeater, that is, amplify the downlink signal from the base station and transmit it to the terminal, and amplify the uplink signal of the terminal and transmit it to the base station, is called F-link. It shall be referred to as . Referring to FIG. 12, C-link corresponds to the link (c) between the base station and the repeater, and F-link corresponds to the link (b) between the base station and the repeater and the link (a) between the repeater and the terminal. However, the name of this link is an example and is not limited by the name.

The base station can transmit control information about the Tx beam or Rx beam for any repeater to the corresponding repeater through C-link. In this disclosure, control information for the repeater of the corresponding base station is referred to as SCI (Side Control Information).

Based on the SCI received from the base station, the repeater can set a DL Tx beam for amplifying/transmitting the base station's signal through F-link or a UL Rx beam for receiving the terminal's uplink signal.

Below, we propose a method for controlling the DL Tx beam or UL Rx beam for F-link. However, the technical idea proposed in this disclosure can also be used when transmitting and receiving the original signal for amplification/transmission between a base station and a repeater through C-link control for SCI transmission or F-link.

According to one example, information on the number of DL Tx beams supported by a certain repeater is transmitted to the base station/network using capability signaling or a pre-configured method. You can have it delivered to . At this time, beam indexing may be performed for each DL Tx beam depending on the number of DL Tx beams supported by the repeater. That is, if a random repeater supports N DL Tx beams, the beam index (or , beam ID) may be assigned.

However, for the DL Tx beam supported by any repeater, the DL Tx beam can be divided into one or more types depending on the cast type. For example, for any repeater, type 1 DL Tx beam(s) for broadcast and type 2 DL Tx beam(s) for multicast/groupcast and unicast ), three types of DL Tx beams can be set: type 3 DL Tx beam(s). Alternatively, two types of DL Tx beams can be set separately: type 1 DL Tx beam(s) for broadcast/multicast/groupcast and type 2 DL Tx beam(s) for unicast.

Likewise, any repeater can transmit information on the number of Rx beams supported by the repeater to the base station/network using capability signaling or pre-configured methods. At this time, beam indexing is performed for each UL Rx beam according to the number of UL Rx beams supported by the repeater. That is, if a random repeater supports N UL Rx beams, the beam index (or beam ID) for each UL Rx beams supported by the repeater is 0, 1, 2, ..., M-1. may be granted. However, according to one example, UL Rx beams may not be defined separately, but may be defined by pairing with the DL Tx beam index (or beam ID) above. That is, as described above, when a random repeater supports N DL Tx beams, N UL Rx beams are supported for UL Rx accordingly, and the DL Tx beam index and UL Rx beam index pair are accordingly It can be defined as 0, 1, 2, ..., N-1.

The base station can transmit control information about the Tx beam or Rx beam for any repeater to the corresponding repeater. The DL Tx beam or UL Rx beam of the corresponding repeater may be indicated from the base station through SCI. At this time, the beam indication information indicating the beam of the corresponding repeater is dynamic beam indication information and semi-static (or periodic or semi-persistent) beam. It can be classified by indication information.

A dynamic beam set and a semi-static beam set supported by an arbitrary repeater may be configured separately. That is, the dynamic DL Tx beam set and dynamic UL Rx beam set can be configured separately from the semi-static DL Tx beam set and semi-static UL Rx beam set. For this purpose, the DL Tx beam or UL Rx beam type supported by the above repeater is divided into a DL or UL beam set configuration that is the target of the dynamic beam indication and a DL and UL beam set configuration that is the target of the semi-static beam indication. can be applied to For example, depending on the cast type above, type 1 DL Tx beam or UL Rx beam for broadcast and multicast/groupcast is used as a semi-static beam set, and type 2 DL Tx beam or UL Rx beam for unicast is used. , can be used as a dynamic beam set. Alternatively, when setting the above repeater capability, it is divided into a semi-static beam set and a dynamic beam set and the dynamic DL Tx beam set, semi-static DL Tx beam set, dynamic UL Rx beam set, and semi-static UL supported by the repeater. Configuration information of the Rx beam set may be transmitted to the base station/network through capability signaling, or may be pre-configured.

Alternatively, without separate distinction between dynamic beam sets and semi-static beam sets, all DL Tx beams and UL Rx beams supported by the repeater may be defined as the target beam set for the corresponding dynamic beam indication or semi-static beam indication. .

Dynamic beam indication information method

Dynamic beam indication is an event-triggered form of beam indication, and the base station can indicate beam information to be used by the corresponding repeater for DL Tx or UL Rx in a specific time period. To this end, the base station can indicate the corresponding dynamic beam indication information and time section allocation information through SCI. At this time, the time section indication information may be assigned time offset information, duration information, etc., in correspondence to each beam indication information.

As another example, dynamic beam indication may be performed as beam change indication information in SCI transmission cycle units. That is, dynamic beam indication can be defined in units of SCI transmission cycles for any repeater. Through this, it can be defined to indicate the DL Tx beam or UL Rx beam to be used by the repeater until the next SCI transmission.

Specifically, when transmitting any SCI, according to the indicated DL Tx beam indication information or UL Rx beam indication information, the repeater transmits DL Tx data from the symbol next to the last symbol in which the relevant SCI transmission occurs to the last symbol in which the next SCI transmission occurs. and UL Rx can be defined to determine the beam to be used. Alternatively, define the SCI processing time or maximum SCI processing time at the repeater, T _proc , and accordingly, the last symbol on which the corresponding SCI transmission occurs + T The last symbol on which the next SCI transmission occurs from the first symbol after _proc + T Up to the last symbol belonging to _proc can be defined to determine the beam to be used during DL Tx and UL Rx. Alternatively, it can be defined to determine the beam to be used during DL Tx and UL Rx from the first slot after the last symbol + T _proc in which the corresponding SCI transmission occurs to the last slot belonging to the last symbol + T _proc in which the next SCI transmission occurs.

Alternatively, it can be defined to determine the beam to be used during DL Tx and UL Rx from the slot next to the slot where SCI transmission occurs to the slot where the next SCI transmission occurs. Alternatively, it can be defined to determine the beam to be used during DL Tx and UL Rx from the slot corresponding to slot + n in which SCI transmission occurs to the slot corresponding to slot + n-1 in which next SCI transmission occurs. In this case, the n value may be indicated by the base station/network through SCI signaling, set through higher layer signaling, or pre-configured.

As another example, the time granularity at which beam instruction is performed through one SCI may be defined, and DL Tx Beam or UL Rx beam instruction information may be transmitted for each time granularity. For example, the time granularity may be configured on a slot basis or a symbol group basis, and a time domain boundary for M beam indications is configured based on the time granularity given within any SCI transmission/reception cycle or monitoring cycle. It can be. In this case, one SCI may include DL TX beam indication information or UL Rx beam indication information for each time granularity. That is, one SCI may include M pieces of beam indication information. According to one example, time granularity may be configured asymmetrically in the time domain. For example, when two time granularity is configured in one slot, they are configured in the form of (1 symbol, 13 symbols) or (2 symbols, 12 symbols), or (3 symbols, 11 symbols), respectively. It can be. Additionally, the time granularity configuration information for the corresponding beam indication may be pre-configured as a single pattern. Alternatively, a plurality of patterns may be defined and pattern information to be used by any repeater may be set or instructed by the base station to the corresponding repeater through higher layer signaling or SCI.

Semi-static beam indication/setting method

Semi-static beam indication is a form of beam indication or setting that is repeated based on a certain period. In the corresponding repeater, the DL Tx beam to be used for DL Tx or the UL Rx beam to be used for UL Rx is indicated or set at a certain period. You can. To this end, separately from the dynamic beam indication method through SCI described above, a semi-static beam indication or setting for an arbitrary repeater may be performed at the base station. The semi-static beam indication or setting may be indicated through a SCI separate from the SCI containing the above dynamic beam indication information. Alternatively, the semi-static beam indication or setting is transmitted through the above dynamic beam indication information and one SCI, but is indicated by defining an information area for dynamic beam indication and a separate semi-static beam indication information area, Or it can be set through higher layer signaling. However, like the dynamic beam indication information above, when semi-static beam indication information is transmitted through SCI, it is necessary to distinguish whether the beam indication information transmitted through the SCI is dynamic beam indication information or semi-static beam indication information. A beam type indication information area may be additionally defined and transmitted through the corresponding SCI. Alternatively, an SCI format for the above dynamic beam indication and a separate SCI format for semi-static beam indication may be defined. The semi-static beam indication or configuration information may include time interval allocation information in which DL Tx or UL Rx based on the beam is performed along with the DL Tx beam indication information or UL Rx beam indication information. The time section allocation information may consist of period information, time offset information, and duration information.

Additionally, instructions or settings for dynamic beams and semi-static beams may be made for any repeater based on the above-described method or another method. At this time, overlap between dynamic beam instructions and semi-static beam instructions or settings may occur in a specific time period. In this case, it is necessary to define the Tx beam or Rx beam to be used for DL Tx or UL Rx in the corresponding repeater. As an example of this, it can be defined to give priority to semi-static beams. That is, if dynamic beam indication information and semi-static beam indication information overlap in the time domain in any repeater, the repeater may configure a DL Tx beam or UL Rx beam by prioritizing the semi-static beam indication information.

Or, conversely, it can be defined to give priority to dynamic beam indication information. If the dynamic beam indication information and the semi-static beam indication information overlap in the time domain in any repeater, the repeater may configure a DL Tx beam or UL Rx beam by prioritizing the dynamic beam indication information.

According to this, the beam information that can be used in data transmission and reception between the repeater and the terminal is controlled to use the optimal beam in consideration of various situations such as whether the terminal is connected, location, and channel status, thereby improving the coverage of the repeater and data transmission and reception. Methods and devices that can improve performance can be provided.

Hereinafter, the configuration of a base station and a repeater capable of performing some or all of the embodiments described with reference to FIGS. 1 to 12 will be described with reference to the drawings. The above-described description may be omitted to avoid redundant description, and in this case, the omitted content may be applied substantially the same to the following description as long as it does not conflict with the technical idea of the invention.

FIG. 13 is a diagram showing the configuration of a base station 1300 according to another embodiment.

Referring to FIG. 13, a base station 1300 according to another embodiment includes a control unit 1310, a transmitter 1320, and a receiver 1330.

The control unit 1310 controls the overall operation of the base station 1300 according to a method of relaying wireless signals in a wireless network necessary to perform the present invention described above.

The control unit 1310 can set a beam index for the beam of the repeater used for communication between the repeater and the terminal.

The control unit 1310 may obtain information about the number of downlink transmission beams and uplink reception beams supported by the repeater. According to one example, information on the number of beams supported by the repeater may be obtained from the repeater through repeater capability signaling. Alternatively, information on the number of beams may be preset for each repeater and stored in the base station.

The control unit 1310 can set a beam index for each downlink transmission beam or uplink reception beam depending on the number of beams supported by the repeater.

According to one example, downlink transmission beams supported by the repeater may be set separately according to cast type. For example, downlink transmission beams can be divided into type 1 for broadcast, type 2 for multicast/groupcast, and type 3 for unicast. Alternatively, downlink transmission beams may be divided into type 1 for broadcast/multicast/groupcast and type 2 for unicast. In this case, the base station can set the beam index for each type.

Or, according to one example, downlink transmission beams and uplink reception beams may be classified according to beamwidth type. For example, when performing secondary sweeping with a narrow beam within a wide beam determined by performing primary sweeping with a wide beam, the controller 1310 controls each of the wide beam and the narrow beam. You can set the beam index for this. In this case, beam width type information and beam index information can be used together in the indication for each beam.

The control unit 1310 may configure side control information for beam control of the repeater based on the beam index and transmit the side control information to the repeater. The control unit 1310 may transmit side control information about the downlink transmission beam or uplink reception beam to the repeater through link c. That is, information about the beams that the repeater will use for signal relay between the base station and the terminal can be indicated through side control information.

The side control information may include beam indication information divided into semi-static beam indication information and dynamic beam indication information. In this case, according to one example, a set of dynamic beams and a set of semi-static beams supported by the repeater may be separately configured and indicated by respective beam indication information.

According to one example, the type of beams according to the above-described cast type may be applied to a set of dynamic beams and a set of semi-static beams. For example, in the case of the above-described type 1 beams for broadcast/multicast/groupcast, a set of semi-static beams may be applied, and in the case of type 2 beams for unicast, a set of dynamic beams may be applied.

However, this is just an example and is not limited to this. According to another example, all downlink transmission beams and uplink reception beams supported by the repeater may be subject to semi-static beam indication information and dynamic beam indication information, respectively, without separate distinction.

According to one example, in the case of dynamic beam indication information, the control unit 1310 may configure information indicating a downlink transmission beam or an uplink reception beam to be used in the repeater and transmit it through downlink control information (DCI). Along with the beam indication information, the time resource to be used can also be determined from a plurality of time resources pre-configured through higher layer signaling and transmitted through DCI. In this case, according to one example, beam indication information and time resource allocation information may be indicated by different field values within the same DCI.

According to one example, semi-static beam indication information may be divided into periodic beam indication information and semi-persistent beam indication information. The control unit 1310 may transmit periodic beam indication information or semi-persistent beam indication information to the repeater through higher layer signaling such as RRC signaling. In this case, the semi-static beam indication information may include beam index indication information and time resource allocation information.

Time resource allocation information may include period information, offset information, and duration information. That is, along with period information for which the downlink transmission beam or uplink reception beam is used, offset information for indicating the start slot within one period and the start symbol within the slot, and duration information that can be defined as the number of symbols are time resources. It may be included in allocation information.

According to one example, when semi-static beam indication information and dynamic beam indication information collide in a predetermined time period, the dynamic beam control information may be configured to have higher priority than the semi-static beam control information. That is, when the same beam is dynamically indicated in a time period in which semi-static beam indication information is set, the dynamic beam indication information may be configured to have a higher priority than the semi-static beam indication information.

Additionally, when the periodic beam control information and the semi-persistent beam control information in the semi-static beam control information collide in a predetermined time period, the semi-persistent beam control information may be configured to have higher priority than the periodic beam control information.

The repeater may transmit and receive data with the terminal based on dynamic beam indication information or semi-static beam indication information received from the base station. That is, the repeater can transmit the signal from the base station to the terminal using the downlink transmission beam indicated by the base station. Likewise, a signal from the terminal can be received using an uplink reception beam indicated from the base station.

Additionally, when different beam indication information collides in the same time period, the repeater can transmit and receive the corresponding signal using the priority beam according to the above-described priority.

According to this, the beam information that can be used in data transmission and reception between the repeater and the terminal is controlled to use the optimal beam in consideration of various situations such as whether the terminal is connected, location, and channel status, thereby improving the coverage of the repeater and data transmission and reception. Methods and devices that can improve performance can be provided.

Figure 14 is a diagram showing the configuration of a repeater 1400 according to another embodiment.

Referring to FIG. 14, a repeater 1400 according to another embodiment includes a control unit 1410, a transmitter 1420, and a receiver 1430.

The control unit 1410 controls the overall operation of the repeater 1400 according to the method of relaying wireless signals in the wireless network necessary to perform the present invention described above. The transmitter 1420 transmits an uplink signal to a base station or a downlink signal to a terminal through a corresponding channel. The receiving unit 1430 performs reception of a downlink signal from a base station or an uplink signal from a terminal through a corresponding channel.

Figure 14 is an example, and is not limited thereto. According to one example, the repeater 1400 is a node that constitutes a wireless network, and is a relay function entity that performs amplification and transmission of wireless signals between a base station and a terminal, and receives a control signal from the base station to relay the relay function entity. It can contain control function objects that control actions. In this case, each functional entity is configured to include the configuration shown in FIG. 14, and each control unit can control side control information-related operations and existing relay operations, respectively.

The control unit 1410 can transmit information about the beam of the repeater that can support communication between the repeater and the terminal. According to one example, the control unit 1410 may transmit information on the number of supported beams to the base station through repeater capability signaling. However, this is just an example, and information on the number of beams may be preset for each repeater and stored in the base station.

The control unit 1410 may receive side control information for beam control of the repeater configured based on the beam index for the beam of the repeater. As described above, the base station can set a beam index for each downlink transmission beam or uplink reception beam depending on the number of beams supported by the repeater.

According to one example, downlink transmission beams supported by the repeater may be set separately according to cast type. For example, downlink transmission beams can be divided into type 1 for broadcast, type 2 for multicast/groupcast, and type 3 for unicast. Alternatively, downlink transmission beams may be divided into type 1 for broadcast/multicast/groupcast and type 2 for unicast. In this case, the base station can set the beam index for each type. In this case, type information and beam index information can be used together to indicate each beam.

Or, according to one example, downlink transmission beams and uplink reception beams may be classified according to beamwidth type. For example, when performing secondary sweeping with a narrow beam within a wide beam determined by performing primary sweeping with a wide beam, the base station sets the beam index for each of the wide beam and narrow beam. can be set. In this case, beam width type information and beam index information can be used together in the indication for each beam.

The control unit 1410 may receive side control information for beam control of the repeater configured by the base station based on the beam index. The control unit 1410 may receive side control information for the downlink transmission beam or uplink reception beam from the base station through link c. That is, information about the beams that the repeater will use for signal relay between the base station and the terminal can be indicated through side control information.

The side control information may include beam indication information divided into semi-static beam indication information and dynamic beam indication information. In this case, according to one example, a set of dynamic beams and a set of semi-static beams supported by the repeater may be separately configured and indicated by respective beam indication information.

According to one example, the type of beams according to the above-described cast type may be applied to a set of dynamic beams and a set of semi-static beams. For example, in the case of the above-described type 1 beams for broadcast/multicast/groupcast, a set of semi-static beams may be applied, and in the case of type 2 beams for unicast, a set of dynamic beams may be applied.

However, this is just an example and is not limited to this. According to another example, all downlink transmission beams and uplink reception beams supported by the repeater may be subject to semi-static beam indication information and dynamic beam indication information, respectively, without separate distinction.

According to one example, in the case of dynamic beam indication information, the control unit 1410 configures information indicating a downlink transmission beam or an uplink reception beam to be used in the repeater and receives it from the base station through downlink control information (DCI). there is. Along with the beam indication information, the time resource to be used can also be determined from a plurality of time resources pre-configured through higher layer signaling and transmitted through DCI. In this case, according to one example, beam indication information and time resource allocation information may be indicated by different field values within the same DCI.

According to one example, semi-static beam indication information may be divided into periodic beam indication information and semi-persistent beam indication information. The control unit 1410 may receive periodic beam indication information or semi-persistent beam indication information from the base station through higher layer signaling such as RRC signaling. In this case, the semi-static beam indication information may include beam index indication information and time resource allocation information.

Time resource allocation information may include period information, offset information, and duration information. That is, along with period information for which the downlink transmission beam or uplink reception beam is used, offset information for indicating the start slot within one period and the start symbol within the slot, and duration information that can be defined as the number of symbols are time resources. It may be included in allocation information.

According to one example, when semi-static beam indication information and dynamic beam indication information collide in a predetermined time period, the dynamic beam control information may be configured to have higher priority than the semi-static beam control information. That is, when the same beam is dynamically indicated in a time period in which semi-static beam indication information is set, the dynamic beam indication information may be configured to have a higher priority than the semi-static beam indication information.

Additionally, when the periodic beam control information and the semi-persistent beam control information in the semi-static beam control information collide in a predetermined time period, the semi-persistent beam control information may be configured to have higher priority than the periodic beam control information.

The control unit 1410 can transmit and receive data with the terminal based on side control information. The control unit 1410 may transmit and receive data with the terminal based on dynamic beam indication information or semi-static beam indication information received from the base station. That is, the control unit 1410 can transmit the signal of the base station to the terminal using the downlink transmission beam indicated by the base station. Likewise, the control unit 1410 can receive a signal from the terminal using an uplink reception beam indicated from the base station.

Additionally, when different beam indication information collides in the same time period, the control unit 1410 may transmit and receive the corresponding signal using the priority beam according to the above-described priority.

According to this, the beam information that can be used in data transmission and reception between the repeater and the terminal is controlled to use the optimal beam in consideration of various situations such as whether the terminal is connected, location, and channel status, thereby improving the coverage of the repeater and data transmission and reception. Methods and devices that can improve performance can be provided.

The above-described embodiments may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802, 3GPP, and 3GPP2. That is, steps, configurations, and parts that are not described in the present embodiments to clearly reveal the technical idea may be supported by the above-mentioned standard documents. Additionally, all terms disclosed in this specification can be explained by the standard documents disclosed above.

The above-described embodiments can be implemented through various means. For example, the present embodiments may be implemented by hardware, firmware, software, or a combination thereof.

In the case of hardware implementation, the method according to the present embodiments uses one or more ASICs (Application Specific Integrated Circuits), DSPs (Digital Signal Processors), DSPDs (Digital Signal Processing Devices), PLDs (Programmable Logic Devices), and FPGAs. (Field Programmable Gate Arrays), processors, controllers, microcontrollers, or microprocessors.

In the case of implementation by firmware or software, the method according to the present embodiments may be implemented in the form of a device, procedure, or function that performs the functions or operations described above. Software code can be stored in a memory unit and run by a processor. The memory unit is located inside or outside the processor and can exchange data with the processor through various known means.

Additionally, terms such as "system", "processor", "controller", "component", "module", "interface", "model", or "unit" described above generally refer to computer-related entities hardware, hardware and software. It may refer to a combination of, software, or running software. By way of example, but not limited to, the foregoing components may be a process, processor, controller, control processor, object, thread of execution, program, and/or computer run by a processor. For example, both an application running on a controller or processor and the controller or processor can be a component. One or more components may reside within a process and/or thread of execution, and the components may be located on a single device (e.g., system, computing device, etc.) or distributed across two or more devices.

The above description is merely an illustrative explanation of the technical idea of the present disclosure, and those skilled in the art will be able to make various modifications and variations without departing from the essential characteristics of the present disclosure. In addition, the present embodiments are not intended to limit the technical idea of the present disclosure, but rather to explain it, so the scope of the present technical idea is not limited by these embodiments. The scope of protection of this disclosure should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of rights of this disclosure.

Claims (20)

In a method for a base station to control the relay of wireless signals,
Setting a beam index for the beam of the repeater used for communication between the repeater and the terminal;
Based on the beam index, configuring side control information for beam control of the repeater; and
Including transmitting the side control information to the repeater,
The side control information includes beam indication information divided into semi-static beam indication information and dynamic beam indication information. According to claim 1,
The semi-static beam indication information is,
A method divided into periodic beam directing information and semi-persistent beam directing information. According to claim 1,
The semi-static beam indication information is,
Contains beam index indication information and time resource allocation information,
The time resource allocation information is,
A method of including period information, offset information, and duration information. According to claim 2,
When the semi-static beam indication information and the dynamic beam indication information collide in a predetermined time period, the dynamic beam indication information is configured to have a higher priority than the semi-static beam indication information. According to claim 4,
When the periodic beam indication information and the semi-persistent beam indication information in the semi-static beam indication information collide in a predetermined time period, the semi-persistent beam indication information is configured to have a higher priority than the periodic beam indication information. method. In a method for a repeater to perform relaying of wireless signals,
Transmitting information about the beam of the repeater that can support communication between the repeater and the terminal;
Receiving side control information for beam control of the repeater configured based on a beam index for the beam of the repeater; and
Transmitting and receiving data with the terminal based on the side control information,
The side control information is divided into semi-static beam indication information and dynamic beam indication information. According to claim 6,
The semi-static beam indication information is,
A method divided into periodic beam directing information and semi-persistent beam directing information. According to claim 6,
The semi-static beam indication information is,
Contains beam index indication information and time resource allocation information,
The time resource allocation information is,
A method of including period information, offset information, and duration information. According to claim 7,
When the semi-static beam indication information and the dynamic beam indication information collide in a predetermined time period, the dynamic beam indication information is configured to have a higher priority than the semi-static beam indication information. According to clause 9,
When the periodic beam indication information and the semi-persistent beam indication information in the semi-static beam indication information collide in a predetermined time period, the semi-persistent beam indication information is configured to have a higher priority than the periodic beam indication information. method. In a base station that controls the relay of wireless signals,
Transmitting unit;
receiving unit; and
It includes a control unit that controls the operation of the transmitter and the receiver,
The control unit sets a beam index for the beam of the repeater used for communication between the repeater and the terminal, and based on the beam index, generates side control information for beam control of the repeater. Configure and transmit the side control information to the repeater,
The side control information is divided into semi-static beam indication information and dynamic beam indication information. According to claim 11,
The semi-static beam indication information is,
A base station divided into periodic beam direction information and semi-persistent beam direction information. According to claim 11,
The semi-static beam indication information is,
Contains beam index indication information and time resource allocation information,
The time resource allocation information is,
A base station containing period information, offset information, and duration information. According to claim 12,
When the semi-static beam indication information and the dynamic beam indication information collide in a predetermined time period, the base station is configured such that the dynamic beam indication information has a higher priority than the semi-static beam indication information. According to claim 14,
When the periodic beam indication information and the semi-persistent beam indication information in the semi-static beam indication information collide in a predetermined time period, the semi-persistent beam indication information is configured to have a higher priority than the periodic beam indication information. Base station. In a repeater that relays wireless signals,
Transmitting unit;
receiving unit; and
It includes a control unit that controls the operation of the transmitter and the receiver,
The control unit transmits information about the beam of the repeater that can support communication between the repeater and the terminal, and provides side control information for beam control of the repeater configured based on the beam index for the beam of the repeater. Receive, transmit and receive data with the terminal based on the side control information,
The side control information is divided into semi-static beam indication information and dynamic beam indication information. According to claim 16,
The semi-static beam indication information is,
A repeater divided into periodic beam direction information and semi-persistent beam direction information. According to claim 16,
The semi-static beam indication information is,
Contains beam index indication information and time resource allocation information,
The time resource allocation information is,
A repeater containing period information, offset information, and duration information. According to claim 17,
When the semi-static beam indication information and the dynamic beam indication information collide in a predetermined time period, the repeater configured such that the dynamic beam indication information has a higher priority than the semi-static beam indication information. According to claim 19,
When the periodic beam indication information and the semi-persistent beam indication information in the semi-static beam indication information collide in a predetermined time period, the semi-persistent beam indication information is configured to have a higher priority than the periodic beam indication information. repeater.

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