KR20230147548A - Method and apparatus for supporting full duplex in a wireless network - Google Patents

Abstract

Embodiments of the present invention relate to a method and an apparatus for supporting full-duplex communication in a wireless network. The method in which a terminal transmits and receives data in a wireless communication system comprises: a step of receiving configuration information for a full-duplex communication mode; a step of receiving resource assignment information assigning wireless resources for uplink transmission in a prescribed frequency band; and a step of performing uplink transmission in the full-duplex communication mode based on the resource assignment information and the configuration information for the full-duplex communication mode. The resource assignment information is received from a first radio access technology base station. In the frequency band, wireless resources for uplink transmission are assigned by a second radio access technology base station.

Description

Method and apparatus for supporting full duplex communication in a wireless network {METHOD AND APPARATUS FOR SUPPORTING FULL DUPLEX IN A WIRELESS NETWORK}

These embodiments propose a method and device for supporting full-duplex communication 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, a specific design is needed to support full-duplex communication in a wireless network.

Embodiments of the present disclosure can provide a method and apparatus for supporting full-duplex communication in NR.

In one aspect, the present embodiments include a method for a terminal to transmit and receive data in a wireless communication system, including receiving configuration information for a full duplex mode, and radio resources for uplink transmission in a predetermined frequency band. Receiving resource allocation information for allocating and performing uplink transmission in a full-duplex communication mode based on configuration information and resource allocation information for the full-duplex communication mode, wherein the resource allocation information includes the first wireless access technology. (radio access technology; RAT) is received from a base station, and the frequency band is a frequency band in which radio resources for downlink transmission are allocated at the second radio access technology base station.

In another aspect, the present embodiments relate to a method for a base station to transmit and receive data in a wireless communication system, including transmitting configuration information for a full duplex mode, and radio resources for uplink reception in a predetermined frequency band. Transmitting resource allocation information for allocating and performing uplink reception in a full-duplex communication mode based on configuration information and resource allocation information for the full-duplex communication mode, wherein the resource allocation information includes the first wireless access technology. (radio access technology; RAT) is received from a base station, and the frequency band is a frequency band in which radio resources for downlink transmission are allocated at the second radio access technology base station.

In another aspect, the present embodiments include a transmitter, a receiver, and a control unit that controls the operations of the transmitter and receiver in a terminal that transmits and receives data in a wireless communication system, and the control unit is configured to operate in a full duplex mode. Receive configuration information, receive resource allocation information allocating radio resources for uplink transmission in a predetermined frequency band, and perform uplink transmission in full-duplex communication mode based on the configuration information and resource allocation information for the full-duplex communication mode. The resource allocation information is received from a first radio access technology (RAT) base station, and the frequency band is a frequency band in which radio resources for downlink transmission are allocated at the second radio access technology base station. can be provided.

In another aspect, the present embodiments include a transmitter, a receiver, and a control unit that controls the operations of the transmitter and receiver in a base station that transmits and receives data in a wireless communication system, and the control unit is configured to operate in a full duplex mode. Transmits configuration information, transmits resource allocation information that allocates radio resources for uplink reception in a predetermined frequency band, and performs uplink reception in full-duplex communication mode based on the configuration information and resource allocation information for the full-duplex communication mode. The resource allocation information is received from a first radio access technology (RAT) base station, and the frequency band is a frequency band in which radio resources for downlink transmission are allocated from the second radio access technology base station. can be provided.

According to the present embodiments, a method and apparatus for supporting full-duplex communication in NR can be provided.

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 terminal performs uplink transmission in full-duplex communication mode according to an embodiment.
FIG. 11 is a diagram illustrating a procedure in which a base station performs uplink reception in full-duplex communication mode according to an embodiment.
12 and 13 are diagrams for explaining configuration information instructing to perform rate matching according to this embodiment.
Figure 14 is a diagram showing the configuration of a terminal according to another embodiment.
Figure 15 is a diagram showing the configuration of a base station 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 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 for supporting full-duplex communication 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 terminal performs uplink transmission in a full-duplex communication mode according to an embodiment.

Referring to FIG. 10, the terminal can receive configuration information for full duplex mode (S1010).

Configuration information for the full-duplex communication mode may include information for transmitting and receiving data in full-duplex communication mode between the terminal and the base station. For example, the configuration information for the full-duplex communication mode may include configuration information for full-duplex communication, such as information about a predetermined frequency band composed of a plurality of resource blocks used in the full-duplex communication mode. The frequency band used in full-duplex communication mode can be arbitrarily set by the base station based on the operating capabilities of the base station, etc. Additionally, the frequency band may be reset due to changes in the channel environment, etc.

Configuration information for the full-duplex communication mode can be transmitted through a broadcasting method that is generally transmitted to all terminals in a cell. Alternatively, it may be transmitted through a multi-casting method, which is transmitted to terminals requiring full-duplex communication mode operation, or a unicasting method, which is transmitted only to specific terminals. The terminal can receive the corresponding configuration information according to the set method.

Referring again to FIG. 10, the terminal can receive resource allocation information allocating radio resources for uplink transmission in a predetermined frequency band (S1020).

Resource allocation information received by the terminal may be received from a first radio access technology (RAT) base station. Hereinafter, according to an example, the description will be made on the assumption that the first wireless access technology base station is a 5G NR base station. However, this is an example and is not limited to this, and may be a base station based on other wireless access technologies. The terminal may be allocated radio resources for transmitting an uplink signal or channel from the first wireless access technology base station.

In order to operate in full-duplex communication mode, radio resources within a predetermined frequency band can be allocated to uplink transmission of the terminal through the resource allocation information. In this case, the predetermined frequency band may be configured to be the same as or include at least part of a predetermined frequency band operating in the full-duplex communication mode included in the configuration information for the full-duplex communication mode described above.

Additionally, the frequency band may be configured to be the same as or include at least a portion of the frequency band to which radio resources for downlink transmission are allocated in the second wireless access technology base station. Hereinafter, according to an example, the description will be made on the assumption that the second wireless access technology base station is an LTE base station. However, this is an example and is not limited to this, and the second wireless access technology base station refers to a base station based on a different wireless access technology than the first wireless access technology.

In order to transmit and receive data in full-duplex communication mode with the terminal, the first wireless access technology base station uses resources for uplink reception in the same frequency band as the frequency band in which the second wireless access technology base station allocates radio resources for downlink transmission. can be assigned. For example, in the corresponding frequency band, an LTE base station can set an uplink slot for uplink reception from a 5G NR base station for radio resources set as downlink subframes for downlink transmission. The terminal can receive information about uplink settings from the 5G NR base station.

Referring again to FIG. 10, the terminal can perform uplink transmission in the full-duplex communication mode based on configuration information and resource allocation information for the full-duplex communication mode (S1030).

The terminal can perform uplink transmission according to uplink allocation information in a frequency band set to operate in full-duplex communication mode. As described above, when full-duplex communication-based frequency sharing is performed between heterogeneous wireless access technologies, cross link interference (CLI) may occur. CLI refers to interference caused by an uplink signal transmitted by an adjacent terminal using the same radio resource with respect to the reception of a downlink signal from a base station performed by the terminal. Therefore, when a neighboring terminal receives a downlink signal from the second wireless access technology base station, the terminal's uplink signal transmission to the first wireless access technology base station may act as interference.

According to one example, in the case of transmission of a UE-specific wireless channel/signal, the base station can resolve interference through scheduling between UEs. In contrast, in the case of transmission of cell-specific wireless channels/signals, it is necessary to resolve CLI for adjacent terminals. That is, the downlink transmission of the second wireless access technology base station may include the transmission of at least one of a synchronization signal, system information, or a cell-specific reference signal, and in this case, CLI that may occur due to the uplink transmission of the terminal may be resolved. There is a need.

For example, system information such as synchronization signal for terminal access such as PSS/SSS or SIB transmitted through PBCH and PDSCH, and cell-specific reference signal (RS) such as LTE CRS. ), etc., it is necessary to minimize or eliminate interference caused by uplink transmission of the terminal when receiving important signals or channels. Additionally, it is necessary to avoid critical downlink transmission on resources set as PRACH (Physical Random Access Channel) rather than grant-based uplink transmission.

In this way, in radio resources allocated for transmission of important downlink signals based on the second wireless access technology, uplink transmission can be performed in full-duplex communication mode based on the first wireless access technology. In this case, the terminal may receive configuration information indicating puncturing or rate matching for radio resources used for downlink transmission of the second wireless access technology base station. The terminal can transmit an uplink signal or channel by performing puncturing or rate matching on the indicated radio resource.

For example, when allocating NR uplink resources that overlap with LTE downlink resources, the NR base station can avoid resource allocation for LTE PSS/SSS and PBCH transmission resources and LTE CRS transmission resources. That is, when scheduling NR uplink transmission, the base station can set or instruct to perform puncturing or rate matching on specific REs (resource elements) for uplink transmission, such as the UE's PUSCH or PUCCH and SRS. there is. Accordingly, the terminal can perform puncturing or rate matching on the corresponding REs when mapping resources for uplink transmission.

According to one example, the first wireless access technology base station (e.g., NR base station) sets the rate for the second wireless access technology (e.g., LTE)-based CRS (Cell Specific Reference Signal) during uplink transmission of the terminal. You can set a matching pattern (ratematchpattern) or puncturing pattern (puncturingpattern). In this case, the LTE CRS rate matching pattern information used for NR uplink transmission includes LTE downlink carrier frequency information, bandwidth information, MBSFN (multimedia broadcast single frequency network) subframe setting information, and CRS port. (port) number information, v-shift information, etc. may be included. Additionally, the LTE CRS rate matching pattern information may include CRS rate matching pattern information for one or more LTE carriers.

Based on this pattern information, the terminal can perform puncturing or rate matching on REs used for LTE CRS transmission in the RE mapping process within allocated radio resources when transmitting uplink such as PUSCH or PUCCH. there is. Likewise, the terminal can perform puncturing or rate matching on LTE PSS/SSS and PBCH transmission resources according to the corresponding pattern information.

According to one example, the configuration information instructing to perform puncturing or rate matching may further include information instructing rate matching for a radio resource adjacent to the radio resource used for downlink transmission of the second wireless access technology base station. You can. That is, additional rate matching can also be set for REs adjacent to LTE CRS REs or REs where PSS/SSS and PBCH transmission occurs. This is due to the difference between the downlink frame time (DL frame time) of the base station and the uplink frame time (UL frame time) of the terminal that is the source of interference, or the propagation delay, etc., and the downlink signal reception time of the base station and the adjacent terminal. This is because a difference may occur between the uplink transmission times. In other words, since CLI is interference caused by a terminal's uplink transmission to the downlink reception of an adjacent terminal, the purpose is to minimize or eliminate CLI even when a difference in symbol boundaries occurs.

Accordingly, a radio resource on which rate matching or puncturing will be performed may be set as a guard resource around a downlink transmission resource requiring CLI avoidance. Hereinafter, it is referred to as a guard resource, but this is an example and is not limited to a specific name as long as the technical idea is applied substantially the same. For example, when setting a CRS rate matching pattern, if certain REs adjacent to the CRS RE are configured as guard resources for CLI avoidance, the terminal can also perform rate matching on the corresponding guard resources.

For example, guard resources may be set to REs adjacent to LTE REs to be avoided in the time domain, that is, REs of the same subcarrier in symbols before or after the LTE CRS transmission symbol. Alternatively, they may be REs adjacent to LTE REs to be avoided in the frequency domain, that is, REs corresponding to subcarriers above or below the same symbol as REs where LTE CRS transmission is performed. The guard resource may be one RE adjacent to the CRS transmission REs, or may be set to N consecutive REs.

Additionally, guard resources for rate matching may be composed of a single pattern. In this case, when setting rate matching for LTE CRS, rate matching according to the corresponding guard resource pattern can be configured to be performed together without separate signaling. Alternatively, whether additional rate matching using the single guard resource pattern may be configured to be signaled together with the LTE CRS rate matching setting. Alternatively, one or more guard resource patterns may be configured, and the base station may transmit guard resource pattern setting information to be applied to rate matching to the terminal.

According to one example, the above-described uplink rate matching in full-duplex communication between heterogeneous wireless access technologies can be applied in substantially the same way when applying full-duplex communication between homogeneous systems. The terminal may further receive configuration information indicating puncturing or rate matching for radio resources used for downlink transmission of the first wireless access technology base station. That is, when the first wireless access technology base station transmits a downlink signal, etc. in a frequency band to which full-duplex communication is applied, it can perform rate matching when allocating resources for uplink transmission to the terminal.

For example, if a 5G NR base station supports full-duplex communication, the terminal can be set to perform rate matching for NR SSB during uplink transmission. Additionally, the base station can perform rate matching on guard resources around the SSB transmission resource. In this case, when setting up the UE's PUSCH or PUCCH transmission at the base station, rate matching information for SSB can be set. SSB rate matching information may include an SSB index value where actual SSB transmission occurs among SSB candidates in a half frame and ssb-periodicityServingCell, which is setting information related to the period of the half frame. At this time, the SSB index value indication may be indicated in the form of a bitmap for each SSB index of SSB candidates. Alternatively, the SSB index value may be indicated directly, or an arbitrary pattern may be defined and indicated as the corresponding pattern value.

In addition, even in the case of a homogeneous system, rate matching for uplink transmission requires, in addition to the above-mentioned SSB transmission, CSI-RS transmission resources, or other downlink reference signal (DL reference signal) transmission resources such as PRS, PT-RS, and RIM-RS. It can also be set for . In this case, identification information about the type of downlink reference signal that requires rate matching and resource allocation information through which transmission of the corresponding reference signal is performed can be transmitted through rate matching information for uplink transmission.

Additionally, even in the case of a homogeneous system, when setting rate matching for transmission of an NR SSB or downlink reference signal, rate matching for guard resources may also be set. As described above, REs corresponding to guard resources may be composed of REs adjacent to the transmission resource of the SSB or downlink reference signal. That is, the guard resource may be in the form of a guard time of the previous or subsequent symbol, which is an adjacent resource in the time domain, and a guard subcarrier of the upper or lower subcarrier, which is an adjacent resource in the frequency domain. .

Alternatively, a single pattern may be defined for the guard resource and rate matching may be set implicitly or explicitly. Alternatively, one or more patterns may be defined for the guard resource, and guard resource rate matching pattern setting information may be included when setting rate matching.

According to one example, the terminal may receive uplink rate matching information from the base station through higher layer signaling such as RRC signaling. Alternatively, the terminal may receive uplink rate matching information from the base station through L1/L2 control signaling.

According to one example, radio resource configuration information requiring application of rate matching may reuse existing configuration information. For example, rate matching settings for LTE CRS may be configured so that previously defined RateMatchPatternLTE-CRS setting information is applied to uplink rate matching. In this case, the information may additionally include information area and guard resource setting information for setting whether to apply uplink rate matching. Alternatively, a separate RRC message for uplink rate matching may be defined, and rate matching for LTE PSS/SSS and PBCH or LTE CRS, or NR SSB or NR DL RS, etc. may be set through this message.

According to one example, the uplink rate matching may be set independently for PUSCH or PUCCH, or may be set to apply only to PUSCH. Alternatively, it may be applied by default to PUSCH, and the base station may be configured to set whether to apply rate matching to PUCCH.

According to this, it is possible to provide a method and device for supporting full-duplex communication in which a terminal can efficiently perform uplink transmission without interference in a full-duplex communication mode in a frequency band allocated to the downlink by another RAT base station.

FIG. 11 is a diagram illustrating a procedure 1100 in which a base station performs uplink reception in a full-duplex communication mode 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 base station may transmit configuration information for full duplex mode (S1500).

Configuration information for the full-duplex communication mode may include information for transmitting and receiving data in full-duplex communication mode between the terminal and the base station. For example, the configuration information for the full-duplex communication mode may include configuration information for full-duplex communication, such as information about a predetermined frequency band composed of a plurality of resource blocks used in the full-duplex communication mode. The frequency band used in full-duplex communication mode can be arbitrarily set by the base station based on the operating capabilities of the base station, etc. Additionally, the frequency band may be reset due to changes in the channel environment, etc.

The base station can transmit configuration information about the full-duplex communication mode through a broadcasting method that is transmitted to all terminals in the cell. Alternatively, the base station may transmit the configuration information through a multicasting method, which is transmitted to terminals requiring full-duplex communication mode operation, or a unicasting method, which is transmitted only to specific terminals.

Referring again to FIG. 11, the base station may transmit resource allocation information allocating radio resources for uplink reception in a predetermined frequency band (S1510).

The base station that transmits uplink resource allocation information to the terminal may be a first wireless access technology base station. The first wireless access technology base station can allocate radio resources for transmitting uplink signals or channels to the terminal.

In order to operate in full-duplex communication mode, radio resources within a predetermined frequency band can be allocated to uplink transmission of the terminal through the resource allocation information. In this case, the predetermined frequency band may be configured to be the same as or include at least part of a predetermined frequency band operating in the full-duplex communication mode included in the configuration information for the full-duplex communication mode described above.

Additionally, the frequency band may be configured to be the same as or include at least a portion of the frequency band to which radio resources for downlink transmission are allocated in the second wireless access technology base station. Hereinafter, according to an example, the description will be made on the assumption that the second wireless access technology base station is an LTE base station. However, this is an example and is not limited to this, and the second wireless access technology base station refers to a base station based on a different wireless access technology than the first wireless access technology.

In order to transmit and receive data in full-duplex communication mode with the terminal, the first wireless access technology base station uses resources for uplink reception in the same frequency band as the frequency band in which the second wireless access technology base station allocates radio resources for downlink transmission. can be assigned. For example, in the corresponding frequency band, for radio resources set by an LTE base station as a downlink subframe for downlink transmission, a 5G NR base station can set an uplink slot for uplink reception. Conversely, for radio resources for which the LTE base station has configured an uplink subframe for uplink reception, the 5G NR base station can configure a downlink slot for downlink transmission.

Referring again to FIG. 11, the base station may perform uplink reception in the full-duplex communication mode based on configuration information and resource allocation information for the full-duplex communication mode (S1520).

The base station can perform uplink reception according to uplink allocation information in a frequency band set to operate in full-duplex communication mode. When a neighboring terminal receives a downlink signal from a second wireless access technology base station, the terminal's uplink signal transmission to the first wireless access technology base station may act as interference.

According to one example, in the case of transmission of a cell-specific wireless channel/signal, it is necessary to resolve CLI for adjacent terminals. That is, the downlink transmission of the second wireless access technology base station may include the transmission of at least one of a synchronization signal, system information, or a cell-specific reference signal, and in this case, CLI that may occur due to the uplink transmission of the terminal may be resolved. There is a need.

For example, system information such as synchronization signal for terminal access such as PSS/SSS or SIB transmitted through PBCH and PDSCH, and cell-specific reference signal (RS) such as LTE CRS. ), etc., it is necessary to minimize or eliminate interference caused by uplink transmission of the terminal when receiving important signals or channels. Additionally, it is necessary to avoid critical downlink transmission on resources set as PRACH (Physical Random Access Channel) rather than grant-based uplink transmission.

In this way, in radio resources allocated for transmission of important downlink signals based on the second wireless access technology, uplink transmission can be performed in full-duplex communication mode based on the first wireless access technology. In this case, the base station may transmit configuration information indicating puncturing or rate matching for radio resources used for downlink transmission of the second wireless access technology base station to the terminal. The base station can receive an uplink signal or channel transmitted by the terminal by performing puncturing or rate matching on the indicated radio resource.

According to one example, the first wireless access technology base station (e.g., NR base station) sets the rate for the second wireless access technology (e.g., LTE)-based CRS (Cell Specific Reference Signal) during uplink transmission of the terminal. You can set a matching pattern (ratematchpattern) or puncturing pattern (puncturingpattern). In this case, the LTE CRS rate matching pattern information used for NR uplink transmission includes LTE downlink carrier frequency information, bandwidth information, MBSFN (multimedia broadcast single frequency network) subframe setting information, and CRS port. (port) number information, v-shift information, etc. may be included. Additionally, the LTE CRS rate matching pattern information may include CRS rate matching pattern information for one or more LTE carriers.

Based on this pattern information, the terminal can perform puncturing or rate matching on REs used for LTE CRS transmission in the RE mapping process within allocated radio resources when transmitting uplink such as PUSCH or PUCCH. there is. Likewise, the terminal can perform puncturing or rate matching on LTE PSS/SSS and PBCH transmission resources according to the corresponding pattern information.

According to one example, the configuration information instructing to perform puncturing or rate matching may further include information instructing rate matching for a radio resource adjacent to the radio resource used for downlink transmission of the second wireless access technology base station. You can. That is, additional rate matching can also be set for REs adjacent to LTE CRS REs or REs where PSS/SSS and PBCH transmission occurs. Since CLI is interference caused by a terminal's uplink transmission to the downlink reception of an adjacent terminal, the purpose is to minimize or eliminate CLI even when a difference in symbol boundaries occurs.

Accordingly, a radio resource on which rate matching or puncturing will be performed may be set as a guard resource around a downlink transmission resource requiring CLI avoidance. For example, when setting a CRS rate matching pattern, if certain REs adjacent to the CRS RE are configured as guard resources for CLI avoidance, the terminal can also perform rate matching on the corresponding guard resources.

For example, guard resources may be set to REs adjacent to LTE REs to be avoided in the time domain, that is, REs of the same subcarrier in symbols before or after the LTE CRS transmission symbol. Alternatively, they may be REs adjacent to LTE REs to be avoided in the frequency domain, that is, REs corresponding to subcarriers above or below the same symbol as REs where LTE CRS transmission is performed. The guard resource may be one RE adjacent to the CRS transmission REs, or may be set to N consecutive REs.

Additionally, guard resources for rate matching may be composed of a single pattern. In this case, when setting rate matching for LTE CRS, rate matching according to the corresponding guard resource pattern can be configured to be performed together without separate signaling. Alternatively, whether additional rate matching using the single guard resource pattern may be configured to be signaled together with the LTE CRS rate matching setting. Alternatively, one or more guard resource patterns may be configured, and the base station may transmit guard resource pattern setting information to be applied to rate matching to the terminal.

According to one example, the above-described uplink rate matching in full-duplex communication between heterogeneous wireless access technologies can be applied in substantially the same way when applying full-duplex communication between homogeneous systems. The base station may further transmit configuration information indicating puncturing or rate matching for radio resources used for downlink transmission of the first wireless access technology base station. That is, when the first wireless access technology base station transmits a downlink signal, etc. in a frequency band to which full-duplex communication is applied, it can perform rate matching when allocating resources for uplink transmission to the terminal.

Additionally, even in the case of a homogeneous system, when setting rate matching for transmission of an NR SSB or downlink reference signal, rate matching for guard resources may also be set. As described above, REs corresponding to guard resources may be composed of REs adjacent to the transmission resource of the SSB or downlink reference signal. That is, the guard resource may be in the form of a guard time of the previous or subsequent symbol, which is an adjacent resource in the time domain, and a guard subcarrier of the upper or lower subcarrier, which is an adjacent resource in the frequency domain. .

Alternatively, a single pattern may be defined for the guard resource and rate matching may be set implicitly or explicitly. Alternatively, one or more patterns may be defined for the guard resource, and guard resource rate matching pattern setting information may be included when setting rate matching.

According to one example, the base station may transmit uplink rate matching information to the terminal through higher layer signaling such as RRC signaling. Alternatively, the base station may transmit uplink rate matching information to the terminal through L1/L2 control signaling.

According to one example, radio resource configuration information requiring application of rate matching may reuse existing configuration information. For example, rate matching settings for LTE CRS may be configured so that previously defined RateMatchPatternLTE-CRS setting information is applied to uplink rate matching. In this case, the information may additionally include information area and guard resource setting information for setting whether to apply uplink rate matching. Alternatively, a separate RRC message for uplink rate matching may be defined, and rate matching for LTE PSS/SSS and PBCH or LTE CRS, or NR SSB or NR DL RS, etc. may be set through this message.

According to one example, the uplink rate matching may be set independently for PUSCH or PUCCH, or may be set to apply only to PUSCH. Alternatively, it may be applied by default to PUSCH, and the base station may be configured to set whether to apply rate matching to PUCCH.

According to this, it is possible to provide a method and device for supporting full-duplex communication in which a terminal can efficiently perform uplink transmission without interference in a full-duplex communication mode in a frequency band allocated to the downlink by another RAT base station.

Hereinafter, each embodiment related to a method for supporting full-duplex communication in a wireless network will be described in detail with reference to the related drawings.

This disclosure proposes a method for supporting full duplex communication in a wireless mobile communication system. In particular, this disclosure proposes full-duplex communication between heterogeneous RATs as well as full-duplex communication between homogeneous RATs (Radio Access Technologies), and also proposes an uplink transmission and reception method to support this.

TDD (Time Division Duplex) is a duplexing method widely used in commercial NR (New Radio), that is, 5G mobile communication systems. In TDD, time-segment radio resources are divided into downlink slots and uplink slots, and usually downlink slots are distributed at a higher rate than uplink slots depending on the distribution ratio of uplink traffic and downlink traffic. However, this limitation of uplink slots has a negative impact in terms of coverage and latency. Full-duplex communication can be applied as a technology to solve this problem.

Full-duplex communication is specifically a technology in which a gNB, that is, a base station, simultaneously performs DL transmission and UL reception on the same radio resource. DL reception and UL transmission can also be performed simultaneously on the terminal side. In other words, both the base station and the terminal can support full duplex. However, unlike a base station, which structurally facilitates self-interference cancellation, in the case of a terminal, DL reception performance is easily affected by self-interference of the UL transmission signal. Therefore, it is generally considered that the gNB operates as full-duplex communication and the terminal operates as half-duplex communication. Additionally, in order to reduce the impact of self-interference, gNB simultaneously performs DL transmission and UL reception, but uses subband non-overlapping full-duplex communication (subband non-overlapping) to transmit and receive separately on frequency resources rather than the same resources between DL/UL. full duplex) method can be considered primarily.

As above, various full-duplex communication application scenarios are being considered based on the capabilities of the base station and terminal, frequency band, and frequency interference issues with other companies. However, the above scenarios are all aimed at applying full-duplex communication in a single radio access technology (RAT).

Accordingly, this disclosure proposes a frequency sharing technology based on full-duplex communication between different heterogeneous RATs. For example, it may be a frequency sharing method based on full-duplex communication between LTE and 5G NR. In this case, the 5G NR base station can perform UL reception by setting UL slot(s) for radio resources set by the LTE base station as a DL subframe for DL transmission in an arbitrary frequency band. Conversely, the 5G NR base station can perform DL transmission by setting DL slot(s) for radio resources for which the LTE base station has configured a UL subframe for UL reception. Specifically, in any paired spectrum, the LTE DL band can be used as the UL band of 5G NR, and the UL band of LTE can be used as the DL band of 5G NR. For example, for 5G migration in an arbitrary LTE FDD frequency band, the DL band in the corresponding LTE FDD frequency band can be used by 5G NR for UL reception, and the UL band can be used by 5G NR for DL transmission. You can. Conversely, in any 5G TDD frequency band, the LTE base station sets UL subframe(s) for 5G DL slot(s) and uses them for UL reception, and for 5G UL slot(s), the LTE base station uses DL subframe(s). It can be set to frame(s) and used for DL transmission.

This spectrum sharing technology based on full-duplex communication between heterogeneous RATs can be expanded to 6G, 7G, etc. to be defined in the future. In other words, any 5G frequency band can be defined to be shared and used based on full-duplex communication in 6G. In this case, in the 5G frequency band, the DL section can be used as a 6G UL section, and the 5G UL section can be used as a 6G DL section.

As such, the need for spectrum sharing technology is increasing during the migration process of mobile communication systems, but spectrum sharing technology basically uses orthogonal radio resources between different RATs for the same transmission direction. The focus is on the method. On the other hand, in the present disclosure, frequency efficiency can be improved by using the same radio resources in the form of different transmission direction pairs (i.e., DL-UL pair) based on full-duplex communication between heterogeneous RATs.

Additionally, this disclosure proposes a method for solving cross link interference (CLI) that may occur when frequency sharing based on full-duplex communication between heterogeneous RATs is achieved.

CLI, one of the biggest problems in full-duplex communication, refers to interference caused by the UL signal of an adjacent terminal using the same radio resources when a terminal receives a DL signal from a base station. Therefore, when full-duplex communication is applied between the above-described heterogeneous RATs (e.g., RAT A and RAT B), the UL signal transmission of the terminal belonging to RAT B may act as interference when the terminal of RAT A receives the DL signal. . Conversely, when a terminal belonging to RAT B receives a DL signal, the UL signal transmission of the terminal of RAT B may act as interference.

Transmission of UE-specific wireless channels/signals may be solved through scheduling between UEs. On the other hand, for the transmission of cell-specific wireless channels/signals, a method to more actively solve CLI may be needed. For example, system information such as synchronization signal for terminal access such as PSS/SSS or SIB transmitted through PBCH and PDSCH, and cell-specific reference signal (RS) such as LTE CRS. ), etc., technology to actively avoid CLI may be required. Additionally, it is necessary to avoid critical DL transmission on resources configured as PRACH (Physical Random Access Channel) rather than grant-based UL transmission.

In the present disclosure, for this purpose, UL transmission is performed based on full-duplex communication in a radio resource where critical DL transmission is performed in any RAT A, that is, to minimize CLI in the terminal of RAT B, where UL transmission is performed through the same resource. We propose a UL transmission method for However, as described above, the full duplex communication method may also include sub-band non-overlapping full duplex. Below, the technology will be explained in detail based on an application example of full-duplex communication between LTE and 5G NR. However, this is just an example, and it is clear that the same technology can be applied between LTE and 6G, or between 5G and 6G.

When allocating NR UL resources that overlap with DL of LTE, it can be defined to avoid LTE's PSS/SSS and PBCH transmission resources and LTE CRS transmission resources. That is, when transmitting NR UL, the base station can configure or instruct to perform puncturing or rate matching on specific REs for UL transmission, such as the UE's PUSCH or PUCCH and SRS. Accordingly, the terminal performs puncturing or rate matching on the corresponding resource when transmitting UL.

To this end, the NR base station can define a rate matching pattern or puncturing pattern for LTE CRS during UL transmission of the terminal. The LTE CRS ratematchpattern information for the corresponding NR UL includes LTE DL carrier frequency information, bandwidth information, MBSFN (multimedia broadcast single frequency network) subframe setting information, CRS port number information, v- Shift information, etc. can be included. Additionally, the LTE CRS ratematchpattern information may transmit CRS ratematchpattern information for one or more LTE carriers. Based on this, when transmitting UL, that is, when transmitting any PUSCH or PUCCH, the terminal performs puncturing or rate puncturing for the corresponding LTE CRS transmission REs in the RE mapping process within the allocated radio resources for the corresponding PUSCH or PUCCH transmission. It can be defined to perform matching. In addition, puncturing or rate matching can also be defined for LTE PSS/SSS and PBCH transmission resources according to the information.

However, the LTE CRS ratematching information for the above UL can additionally set additional ratematching for adjacent REs of the REs in addition to the CRS REs or REs where PSS/SSS and PBCH transmission occurs. That is, in the case of CLI, since the uplink transmission of an adjacent terminal causes interference to the downlink reception of any terminal, the difference between the DL frame time of the base station and the UL frame time of the adjacent terminal that is the source of interference and propagation delay ), etc., there may be a difference between the DL signal reception time of the base station and the UL transmission time of the adjacent terminal. In other words, differences in symbol boundaries may occur.

Accordingly, a guard resource can be defined around a DL transmission resource that requires CLI avoidance, and rate matching or puncturing can be performed on the guard resource. That is, when setting the CRS ratematchpattern, REs adjacent to the CRS RE can be defined as a guard resource for CLI avoidance, so that rate matching is also performed on the guard resource. The guard resource may be adjacent REs in the time domain, that is, REs of the same subcarrier in the symbol before or after the LTE CRS transmission symbol.

Alternatively, they may be adjacent REs in the frequency domain, that is, REs corresponding to subcarriers above or below the same symbol as REs where LTE CRS transmission occurs. The guard resource may be one RE adjacent to the CRS transmission RE, or may be N consecutive REs. In addition, the guard resource for rate matching can be defined as a single pattern, so that when setting rate matching for LTE CRS, rate matching for the guard resource pattern is performed together without separate signaling. Alternatively, the guard resource for ratematching can be defined so that signaling is performed along with the LTE CRS ratematching setting regarding whether there is additional ratematching for the single guard resource pattern. Alternatively, one or more guard resource patterns may be defined, and the base station may transmit guard resource pattern setting information to be applied to rate matching to the terminal.

The same UL ratematching described above can be applied when applying full-duplex communication between homogeneous systems. For example, if any 5G NR base station/cell supports full-duplex communication, it can be defined to set rate matching for NR SSB when transmitting UL from any UE. Additionally, rate matching can be defined for guard resources around SSB transmission resources. In this case, when setting up the UE's PUSCH or PUCCH transmission at the base station, rate matching information for SSB can be set. The corresponding SSB rate matching configuration information may include the SSB index value where actual SSB transmission occurs among SSB candidates within a half frame and ssb-periodicityServingCell, which is configuration information related to the period of the half frame. At this time, the SSB index value where actual SSB transmission is performed among the SSB candidates of the half frame is indicated in the form of a bitmap for each SSB index of the SSB candidates within the half frame, or the SSB index value is directly indicated, or An arbitrary pattern can be defined and the corresponding pattern value can be indicated.

In addition to the above SSB transmission, rate matching for UL transmission can also be set for other DL reference signal transmission resources such as CSI-RS transmission resources or PRS, PT-RS, and RIM-RS. In this case, identification information about the type of DL reference signal that requires rate matching and resource allocation information on which the corresponding reference signal is transmitted can be transmitted through rate matching setting information for the corresponding UL transmission.

Additionally, when setting rate matching for the NR SSB or the DL reference signal of NR, rate matching for the guard resource may be set together with the corresponding transmission resource. As described above, the guard resource may be composed of REs adjacent to the corresponding SSB or DL reference signal transmission resource. That is, the guard resource may be in the form of an adjacent resource (previous symbol or subsequent symbol) in the time domain, that is, a guard time, and an adjacent resource (upper or lower subcarrier) in the frequency domain, that is, in the form of a guard subcarrier. A single pattern is defined for the guard resource, and rate matching can be set implicitly or explicitly. The guard resource has one or more patterns defined, and can be defined to include guard resource rate matching pattern setting information when setting rate matching.

The UL ratematching configuration information described above may be set by the base station through RRC signaling or may be indicated through L1/L2 control signaling. At this time, wireless resource configuration information requiring rate matching can be defined to reuse existing configuration information. For example, rate matching settings for LTE CRS can be defined to apply the previously defined RateMatchPatternLTE-CRS setting information of FIGS. 12 and 13 to UL rate matching. In this case, the information may additionally include an information area for setting whether to apply UL ratematching and guard resource setting information as described above. Alternatively, a separate RRC message for UL rate matching is defined, and rate matching for LTE PSS/SSS and PBCH or LTE CRS, or NR SSB or NR DL RS, etc. can be set through this message.

Additionally, rate matching for the corresponding UL may be set independently for PUSCH or PUCCH, or may be defined so that UL rate matching is applied only to PUSCH. Alternatively, it can be applied by default to PUSCH, and the base station can define whether to apply rate matching to PUCCH.

According to this, it is possible to provide a method and device for supporting full-duplex communication in which a terminal can efficiently perform uplink transmission without interference in a full-duplex communication mode in a frequency band allocated to the downlink by another RAT base station.

Hereinafter, the configuration of a terminal and a base station capable of performing some or all of the embodiments described with reference to FIGS. 1 to 13 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.

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

Referring to FIG. 14, a terminal 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 terminal 1400 according to a method for supporting full-duplex communication required to perform the present invention described above.

The terminal can receive configuration information about the full-duplex communication mode. Configuration information for the full-duplex communication mode may include information for transmitting and receiving data in full-duplex communication mode between the terminal and the base station. For example, the configuration information for the full-duplex communication mode may include configuration information for full-duplex communication, such as information about a predetermined frequency band composed of a plurality of resource blocks used in the full-duplex communication mode. The frequency band used in full-duplex communication mode can be arbitrarily set by the base station based on the operating capabilities of the base station, etc. Additionally, the frequency band may be reset due to changes in the channel environment, etc.

Configuration information for the full-duplex communication mode can be transmitted through a broadcasting method that is generally transmitted to all terminals in a cell. Alternatively, it may be transmitted through a multi-casting method, which is transmitted to terminals requiring full-duplex communication mode operation, or a unicasting method, which is transmitted only to specific terminals. The control unit 1410 can receive the corresponding configuration information according to a set method.

The control unit 1410 may receive resource allocation information allocating radio resources for uplink transmission in a predetermined frequency band. Resource allocation information received by the control unit 1410 may be received from a first radio access technology (RAT) base station. The control unit 1410 may be allocated radio resources for transmitting an uplink signal or channel from the first wireless access technology base station.

In order to operate in full-duplex communication mode, radio resources within a predetermined frequency band can be allocated to uplink transmission of the terminal through the resource allocation information. In this case, the predetermined frequency band may be configured to be the same as or include at least part of a predetermined frequency band operating in the full-duplex communication mode included in the configuration information for the full-duplex communication mode described above.

Additionally, the frequency band may be configured to be the same as or include at least a portion of the frequency band to which radio resources for downlink transmission are allocated in the second wireless access technology base station.

In order to transmit and receive data in full-duplex communication mode with the terminal, the first wireless access technology base station uses resources for uplink reception in the same frequency band as the frequency band in which the second wireless access technology base station allocates radio resources for downlink transmission. can be assigned. For example, in the corresponding frequency band, an LTE base station can set an uplink slot for uplink reception from a 5G NR base station for radio resources set as downlink subframes for downlink transmission. The control unit 1410 can receive information about uplink settings from the 5G NR base station.

The control unit 1410 may perform uplink transmission in the full-duplex communication mode based on configuration information and resource allocation information for the full-duplex communication mode.

The control unit 1410 may perform uplink transmission according to uplink allocation information in a frequency band set to operate in full-duplex communication mode. As described above, when full-duplex communication-based frequency sharing is performed between heterogeneous wireless access technologies, cross link interference (CLI) may occur. Therefore, when a neighboring terminal receives a downlink signal from the second wireless access technology base station, the terminal's uplink signal transmission to the first wireless access technology base station may act as interference.

According to one example, in the case of transmission of a UE-specific wireless channel/signal, the base station can resolve interference through scheduling between UEs. In contrast, in the case of transmission of cell-specific wireless channels/signals, it is necessary to resolve CLI for adjacent terminals. That is, the downlink transmission of the second wireless access technology base station may include the transmission of at least one of a synchronization signal, system information, or a cell-specific reference signal, and in this case, CLI that may occur due to the uplink transmission of the terminal may be resolved. There is a need.

For example, system information such as synchronization signal for terminal access such as PSS/SSS or SIB transmitted through PBCH and PDSCH, and cell-specific reference signal (RS) such as LTE CRS. ), etc., it is necessary to minimize or eliminate interference caused by uplink transmission of the terminal when receiving important signals or channels. Additionally, it is necessary to avoid critical downlink transmission on resources set as PRACH (Physical Random Access Channel) rather than grant-based uplink transmission.

In this way, in radio resources allocated for transmission of important downlink signals based on the second wireless access technology, uplink transmission can be performed in full-duplex communication mode based on the first wireless access technology. In this case, the control unit 1410 may receive configuration information indicating puncturing or rate matching for radio resources used for downlink transmission of the second wireless access technology base station. The control unit 1410 may transmit an uplink signal or channel by performing puncturing or rate matching on the indicated radio resource.

According to one example, the first wireless access technology base station (e.g., NR base station) sets the rate for the second wireless access technology (e.g., LTE)-based CRS (Cell Specific Reference Signal) during uplink transmission of the terminal. You can set a matching pattern (ratematchpattern) or puncturing pattern (puncturingpattern). In this case, the LTE CRS rate matching pattern information used for NR uplink transmission includes LTE downlink carrier frequency information, bandwidth information, MBSFN (multimedia broadcast single frequency network) subframe setting information, and CRS port. (port) number information, v-shift information, etc. may be included. Additionally, the LTE CRS rate matching pattern information may include CRS rate matching pattern information for one or more LTE carriers.

Based on this pattern information, the control unit 1410 performs puncturing or rate matching for REs used for LTE CRS transmission in the RE mapping process within allocated radio resources when transmitting uplink such as PUSCH or PUCCH. It can be done. Likewise, the control unit 1410 may perform puncturing or rate matching on LTE PSS/SSS and PBCH transmission resources according to the corresponding pattern information.

According to one example, the configuration information instructing to perform puncturing or rate matching may further include information instructing rate matching for a radio resource adjacent to the radio resource used for downlink transmission of the second wireless access technology base station. You can. That is, additional rate matching can also be set for REs adjacent to LTE CRS REs or REs where PSS/SSS and PBCH transmission occurs. Since CLI is interference caused by a terminal's uplink transmission to the downlink reception of an adjacent terminal, the purpose is to minimize or eliminate CLI even when a difference in symbol boundaries occurs.

Accordingly, a radio resource on which rate matching or puncturing will be performed may be set as a guard resource around a downlink transmission resource requiring CLI avoidance. For example, when setting a CRS rate matching pattern, if certain REs adjacent to the CRS RE are configured as guard resources for CLI avoidance, the control unit 1410 may also perform rate matching on the corresponding guard resources.

For example, guard resources may be set to REs adjacent to LTE REs to be avoided in the time domain, that is, REs of the same subcarrier in symbols before or after the LTE CRS transmission symbol. Alternatively, they may be REs adjacent to LTE REs to be avoided in the frequency domain, that is, REs corresponding to subcarriers above or below the same symbol as REs where LTE CRS transmission is performed. The guard resource may be one RE adjacent to the CRS transmission REs, or may be set to N consecutive REs.

Additionally, guard resources for rate matching may be composed of a single pattern. In this case, when setting rate matching for LTE CRS, rate matching according to the corresponding guard resource pattern can be configured to be performed together without separate signaling. Alternatively, whether additional rate matching using the single guard resource pattern may be configured to be signaled together with the LTE CRS rate matching setting. Alternatively, one or more guard resource patterns may be configured, and the base station may transmit guard resource pattern setting information to be applied to rate matching to the terminal.

According to one example, the above-described uplink rate matching in full-duplex communication between heterogeneous wireless access technologies can be applied in substantially the same way when applying full-duplex communication between homogeneous systems. The control unit 1410 may further receive configuration information instructing puncturing or rate matching for radio resources used for downlink transmission of the first wireless access technology base station. That is, when the first wireless access technology base station transmits a downlink signal, etc. in a frequency band to which full-duplex communication is applied, it can perform rate matching when allocating resources for uplink transmission to the terminal.

For example, if a 5G NR base station supports full-duplex communication, the terminal can be set to perform rate matching for NR SSB during uplink transmission. Additionally, the base station can perform rate matching on guard resources around the SSB transmission resource. In this case, when setting up the UE's PUSCH or PUCCH transmission at the base station, rate matching information for SSB can be set. SSB rate matching information may include an SSB index value where actual SSB transmission occurs among SSB candidates in a half frame and ssb-periodicityServingCell, which is setting information related to the period of the half frame. At this time, the SSB index value indication may be indicated in the form of a bitmap for each SSB index of SSB candidates. Alternatively, the SSB index value may be indicated directly, or an arbitrary pattern may be defined and indicated as the corresponding pattern value.

In addition, even in the case of a homogeneous system, rate matching for uplink transmission requires, in addition to the above-mentioned SSB transmission, CSI-RS transmission resources, or other downlink reference signal (DL reference signal) transmission resources such as PRS, PT-RS, and RIM-RS. It can also be set for . In this case, identification information about the type of downlink reference signal that requires rate matching and resource allocation information through which transmission of the corresponding reference signal is performed can be transmitted through rate matching information for uplink transmission.

Additionally, even in the case of a homogeneous system, when setting rate matching for transmission of an NR SSB or downlink reference signal, rate matching for guard resources may also be set. As described above, REs corresponding to guard resources may be composed of REs adjacent to the transmission resource of the SSB or downlink reference signal. That is, the guard resource may be in the form of a guard time of the previous or subsequent symbol, which is an adjacent resource in the time domain, and a guard subcarrier of the upper or lower subcarrier, which is an adjacent resource in the frequency domain. .

Alternatively, a single pattern may be defined for the guard resource and rate matching may be set implicitly or explicitly. Alternatively, one or more patterns may be defined for the guard resource, and guard resource rate matching pattern setting information may be included when setting rate matching.

According to one example, the control unit 1410 may receive uplink rate matching information from the base station through higher layer signaling such as RRC signaling. Alternatively, the control unit 1410 may receive uplink rate matching information from the base station through L1/L2 control signaling.

According to one example, radio resource configuration information requiring application of rate matching may reuse existing configuration information. For example, rate matching settings for LTE CRS may be configured so that previously defined RateMatchPatternLTE-CRS setting information is applied to uplink rate matching. In this case, the information may additionally include information area and guard resource setting information for setting whether to apply uplink rate matching. Alternatively, a separate RRC message for uplink rate matching may be defined, and rate matching for LTE PSS/SSS and PBCH or LTE CRS, or NR SSB or NR DL RS, etc. may be set through this message.

According to one example, the uplink rate matching may be set independently for PUSCH or PUCCH, or may be set to apply only to PUSCH. Alternatively, it may be applied by default to PUSCH, and the base station may be configured to set whether to apply rate matching to PUCCH.

According to this, it is possible to provide a method and device for supporting full-duplex communication in which a terminal can efficiently perform uplink transmission without interference in a full-duplex communication mode in a frequency band allocated to the downlink by another RAT base station.

Figure 15 is a diagram showing the configuration of a base station 1500 according to another embodiment.

Referring to FIG. 15, a base station 1500 according to another embodiment includes a control unit 1510, a transmitter 1520, and a receiver 1530.

The control unit 1510 controls the overall operation of the base station 1500 according to a method for supporting full-duplex communication required to perform the present invention described above. The transmitter 1520 transmits downlink control information, data, and messages to the terminal through the corresponding channel. The receiving unit 1530 receives downlink control information, data, messages, etc. from the base station through the corresponding channel.

The control unit 1510 may transmit configuration information for full duplex mode. Configuration information for the full-duplex communication mode may include information for transmitting and receiving data in full-duplex communication mode between the terminal and the base station. For example, the configuration information for the full-duplex communication mode may include configuration information for full-duplex communication, such as information about a predetermined frequency band composed of a plurality of resource blocks used in the full-duplex communication mode. The frequency band used in full-duplex communication mode can be arbitrarily set by the base station based on the operating capabilities of the base station, etc. Additionally, the frequency band may be reset due to changes in the channel environment, etc.

The control unit 1510 can transmit configuration information about the full-duplex communication mode through a broadcasting method that is transmitted to all terminals in the cell. Alternatively, the control unit 1510 may transmit the configuration information through a multicasting method, which is transmitted to terminals requiring full-duplex communication mode operation, or a unicasting method, which is transmitted only to specific terminals.

The control unit 1510 may transmit resource allocation information allocating radio resources for uplink reception in a predetermined frequency band. The base station that transmits uplink resource allocation information to the terminal may be a first wireless access technology base station. The first wireless access technology base station can allocate radio resources for transmitting uplink signals or channels to the terminal.

In order to operate in full-duplex communication mode, radio resources within a predetermined frequency band can be allocated to uplink transmission of the terminal through the resource allocation information. In this case, the predetermined frequency band may be configured to be the same as or include at least part of a predetermined frequency band operating in the full-duplex communication mode included in the configuration information for the full-duplex communication mode described above.

Additionally, the frequency band may be configured to be the same as or include at least a portion of the frequency band to which radio resources for downlink transmission are allocated in the second wireless access technology base station.

In order to transmit and receive data in full-duplex communication mode with the terminal, the first wireless access technology base station uses resources for uplink reception in the same frequency band as the frequency band in which the second wireless access technology base station allocates radio resources for downlink transmission. can be assigned. For example, in the corresponding frequency band, for radio resources set by an LTE base station as a downlink subframe for downlink transmission, a 5G NR base station can set an uplink slot for uplink reception. Conversely, for radio resources for which the LTE base station has configured an uplink subframe for uplink reception, the 5G NR base station can configure a downlink slot for downlink transmission.

The control unit 1510 may perform uplink reception in the full-duplex communication mode based on configuration information and resource allocation information for the full-duplex communication mode. The control unit 1510 may perform uplink reception according to uplink allocation information in a frequency band set to operate in full-duplex communication mode. When a neighboring terminal receives a downlink signal from a second wireless access technology base station, the terminal's uplink signal transmission to the first wireless access technology base station may act as interference.

According to one example, in the case of transmission of a cell-specific wireless channel/signal, it is necessary to resolve CLI for adjacent terminals. That is, the downlink transmission of the second wireless access technology base station may include the transmission of at least one of a synchronization signal, system information, or a cell-specific reference signal, and in this case, CLI that may occur due to the uplink transmission of the terminal may be resolved. There is a need.

For example, system information such as synchronization signal for terminal access such as PSS/SSS or SIB transmitted through PBCH and PDSCH, and cell-specific reference signal (RS) such as LTE CRS. ), etc., it is necessary to minimize or eliminate interference caused by uplink transmission of the terminal when receiving important signals or channels. Additionally, it is necessary to avoid critical downlink transmission on resources set as PRACH (Physical Random Access Channel) rather than grant-based uplink transmission.

In this way, in radio resources allocated for transmission of important downlink signals based on the second wireless access technology, uplink transmission can be performed in full-duplex communication mode based on the first wireless access technology. In this case, the control unit 1510 may transmit configuration information indicating puncturing or rate matching for radio resources used for downlink transmission of the second wireless access technology base station to the terminal. The control unit 1510 may receive an uplink signal or channel transmitted by the terminal by performing puncturing or rate matching on the indicated radio resource.

According to one example, the control unit 1510 of the first wireless access technology base station (e.g., NR base station) uses a cell specific reference (CRS) based on the second wireless access technology (e.g., LTE) during uplink transmission of the terminal. You can set the rate matching pattern or puncturing pattern for Signal. In this case, the LTE CRS rate matching pattern information used for NR uplink transmission includes LTE downlink carrier frequency information, bandwidth information, MBSFN (multimedia broadcast single frequency network) subframe setting information, and CRS port. (port) number information, v-shift information, etc. may be included. Additionally, the LTE CRS rate matching pattern information may include CRS rate matching pattern information for one or more LTE carriers.

Based on this pattern information, the terminal can perform puncturing or rate matching on REs used for LTE CRS transmission in the RE mapping process within allocated radio resources when transmitting uplink such as PUSCH or PUCCH. there is. Likewise, the terminal can perform puncturing or rate matching on LTE PSS/SSS and PBCH transmission resources according to the corresponding pattern information.

According to one example, the configuration information instructing to perform puncturing or rate matching may further include information instructing rate matching for a radio resource adjacent to the radio resource used for downlink transmission of the second wireless access technology base station. You can. That is, additional rate matching can also be set for REs adjacent to LTE CRS REs or REs where PSS/SSS and PBCH transmission occurs. Since CLI is interference caused by a terminal's uplink transmission to the downlink reception of an adjacent terminal, the purpose is to minimize or eliminate CLI even when a difference in symbol boundaries occurs.

Accordingly, a radio resource on which rate matching or puncturing will be performed may be set as a guard resource around a downlink transmission resource requiring CLI avoidance. For example, when setting a CRS rate matching pattern, if certain REs adjacent to the CRS RE are configured as guard resources for CLI avoidance, the terminal can also perform rate matching on the corresponding guard resources.

For example, guard resources may be set to REs adjacent to LTE REs to be avoided in the time domain, that is, REs of the same subcarrier in symbols before or after the LTE CRS transmission symbol. Alternatively, they may be REs adjacent to LTE REs to be avoided in the frequency domain, that is, REs corresponding to subcarriers above or below the same symbol as REs where LTE CRS transmission is performed. The guard resource may be one RE adjacent to the CRS transmission REs, or may be set to N consecutive REs.

Additionally, guard resources for rate matching may be composed of a single pattern. In this case, when setting rate matching for LTE CRS, rate matching according to the corresponding guard resource pattern can be configured to be performed together without separate signaling. Alternatively, whether additional rate matching using the single guard resource pattern may be configured to be signaled together with the LTE CRS rate matching setting. Alternatively, one or more guard resource patterns may be configured, and the base station may transmit guard resource pattern setting information to be applied to rate matching to the terminal.

According to one example, the above-described uplink rate matching in full-duplex communication between heterogeneous wireless access technologies can be applied in substantially the same way when applying full-duplex communication between homogeneous systems. The control unit 1510 may further transmit configuration information indicating puncturing or rate matching for radio resources used for downlink transmission of the first wireless access technology base station to the terminal. That is, when the first wireless access technology base station transmits a downlink signal, etc. in a frequency band to which full-duplex communication is applied, it can perform rate matching when allocating resources for uplink transmission to the terminal.

Additionally, even in the case of a homogeneous system, when setting rate matching for transmission of an NR SSB or downlink reference signal, rate matching for guard resources may also be set. As described above, REs corresponding to guard resources may be composed of REs adjacent to the transmission resource of the SSB or downlink reference signal. That is, the guard resource may be in the form of a guard time of the previous or subsequent symbol, which is an adjacent resource in the time domain, and a guard subcarrier of the upper or lower subcarrier, which is an adjacent resource in the frequency domain. .

Alternatively, a single pattern may be defined for the guard resource and rate matching may be set implicitly or explicitly. Alternatively, one or more patterns may be defined for the guard resource, and guard resource rate matching pattern setting information may be included when setting rate matching.

According to one example, the control unit 1510 may transmit uplink rate matching information to the terminal through higher layer signaling such as RRC signaling. Alternatively, the control unit 1510 may transmit uplink rate matching information to the terminal through L1/L2 control signaling.

According to one example, radio resource configuration information requiring application of rate matching may reuse existing configuration information. For example, rate matching settings for LTE CRS may be configured so that previously defined RateMatchPatternLTE-CRS setting information is applied to uplink rate matching. In this case, the information may additionally include information area and guard resource setting information for setting whether to apply uplink rate matching. Alternatively, a separate RRC message for uplink rate matching may be defined, and rate matching for LTE PSS/SSS and PBCH or LTE CRS, or NR SSB or NR DL RS, etc. may be set through this message.

According to one example, the uplink rate matching may be set independently for PUSCH or PUCCH, or may be set to apply only to PUSCH. Alternatively, it may be applied by default to PUSCH, and the base station may be configured to set whether to apply rate matching to PUCCH.

According to this, it is possible to provide a method and device for supporting full-duplex communication in which a terminal can efficiently perform uplink transmission without interference in a full-duplex communication mode in a frequency band allocated to the downlink by another RAT base station.

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 terminal to transmit and receive data in a wireless communication system,
Receiving configuration information for a full duplex mode;
Receiving resource allocation information allocating radio resources for uplink transmission in a predetermined frequency band; and
Comprising the step of performing uplink transmission in a full-duplex communication mode based on the configuration information for the full-duplex communication mode and the resource allocation information,
The resource allocation information is received from a first radio access technology (RAT) base station,
The frequency band is a frequency band in which radio resources for downlink transmission are allocated in a second wireless access technology base station. According to claim 1,
The method further includes receiving configuration information indicating puncturing or rate matching for radio resources used for downlink transmission of the second wireless access technology base station. According to claim 2,
Downlink transmission of the second wireless access technology base station is,
A method including transmission of at least one of a synchronization signal, system information, or a cell-specific reference signal. According to claim 2,
Configuration information instructing to perform the puncturing or rate matching is,
The method further includes information indicating rate matching for radio resources adjacent to radio resources used for downlink transmission of the second radio access technology base station. According to claim 1,
The method further includes receiving configuration information indicating puncturing or rate matching for radio resources used for downlink transmission of the first wireless access technology base station. In a method for a base station to transmit and receive data in a wireless communication system,
transmitting configuration information for a full duplex mode;
Transmitting resource allocation information allocating radio resources for uplink reception in a predetermined frequency band; and
Comprising the step of performing uplink reception in a full-duplex communication mode based on the configuration information for the full-duplex communication mode and the resource allocation information,
The resource allocation information is received from a first radio access technology (RAT) base station,
The frequency band is a frequency band in which radio resources for downlink transmission are allocated in a second wireless access technology base station. According to claim 6,
The method further includes transmitting configuration information indicating puncturing or rate matching for radio resources used for downlink transmission of the second wireless access technology base station. According to claim 7,
Downlink transmission of the second wireless access technology base station is,
A method including transmission of at least one of a synchronization signal, system information, or a cell-specific reference signal. According to claim 7,
Configuration information instructing to perform the puncturing or rate matching is,
The method further includes information indicating rate matching for radio resources adjacent to radio resources used for downlink transmission of the second radio access technology base station. According to claim 6,
The method further includes transmitting configuration information indicating puncturing or rate matching for radio resources used for downlink transmission of the first wireless access technology base station. In a terminal that transmits and receives data in a wireless communication system,
Transmitting unit;
receiving unit; and
It includes a control unit that controls the operation of the transmitter and the receiver,
The control unit receives configuration information for a full duplex mode, receives resource allocation information for allocating radio resources for uplink transmission in a predetermined frequency band, and configures information for the full duplex communication mode. Perform uplink transmission in full-duplex communication mode based on the resource allocation information,
The resource allocation information is received from a first radio access technology (RAT) base station,
The frequency band is a frequency band in which radio resources for downlink transmission are allocated at a second wireless access technology base station. According to claim 11,
The control unit,
A terminal further receiving configuration information indicating puncturing or rate matching for radio resources used for downlink transmission of the second wireless access technology base station. According to claim 12,
Downlink transmission of the second wireless access technology base station is,
A terminal that includes transmission of at least one of a synchronization signal, system information, or cell-specific reference signal. According to claim 12,
Configuration information instructing to perform the puncturing or rate matching is,
A terminal further comprising information instructing rate matching for radio resources adjacent to radio resources used for downlink transmission of the second radio access technology base station. According to claim 11,
The control unit,
A terminal further receiving configuration information instructing puncturing or rate matching for radio resources used for downlink transmission of the first wireless access technology base station. In a base station that transmits and receives data in a wireless communication system,
Transmitting unit;
receiving unit; and
It includes a control unit that controls the operation of the transmitter and the receiver,
The control unit transmits configuration information for the full duplex communication mode, transmits resource allocation information for allocating radio resources for uplink reception in a predetermined frequency band, and configuration information for the full duplex communication mode and Perform uplink reception in full-duplex communication mode based on the resource allocation information,
The resource allocation information is received from a first radio access technology (RAT) base station,
The frequency band is a frequency band in which radio resources for downlink transmission are allocated in a second wireless access technology base station. According to claim 16,
The control unit,
A base station that further transmits configuration information indicating puncturing or rate matching for radio resources used for downlink transmission of the second wireless access technology base station. According to claim 17,
Downlink transmission of the second wireless access technology base station is,
A base station that includes transmission of at least one of a synchronization signal, system information, or cell-specific reference signal. According to claim 17,
Configuration information instructing to perform the puncturing or rate matching is,
A base station further comprising information instructing rate matching for radio resources adjacent to radio resources used for downlink transmission of the second radio access technology base station. According to claim 16,
The control unit,
A base station further transmitting configuration information instructing puncturing or rate matching for radio resources used for downlink transmission of the first wireless access technology base station.

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