KR20220032450A - Method and apparatus for interference measerument in wireless communication system - Google Patents

Abstract

The present invention relates to a 5G or 6G communication system to support a higher data transmission rate after a 4G communication system such as LTE. The present invention provides a method of a first node for self-interference measurement which comprises the following steps of: obtaining self-interference channel measurement settings; transmitting a measurement signal for self-interference measurement based on the self-interference channel measurement settings; and measuring self-interference generated by the measurement signal for self-interference channel measurement based on the self-interference channel measurement settings and a device for performing the method.

Description

Method and apparatus for measuring interference in a wireless communication system

The present invention relates to a method and apparatus for measuring interference in a wireless communication system. In addition, the present invention relates to a method and apparatus for measuring self-interference during FULL DUPLEX operation of INTEGRATED ACCESS BACKHAUL (IAB) in a wireless communication system.

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

In a 6G communication system that is predicted to be realized around 2030, the maximum transmission speed is tera (that is, 1,000 gigabytes) bps, and the wireless latency is 100 microseconds (μsec). That is, the transmission speed in the 6G communication system is 50 times faster than in the 5G communication system, and the wireless delay time is reduced by one-tenth.

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

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

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

Various embodiments of the present invention propose an improved method and apparatus for measuring interference in a wireless communication system. In addition, various embodiments of the present invention propose a method and apparatus for measuring self-interference during a full-duplex communication operation of an integrated access backhaul in a wireless communication system.

According to an embodiment of the present invention, there is provided a method of a first node for self-interference measurement, the method comprising: acquiring a self-interference channel measurement setting; transmitting a measurement signal for self-interference measurement based on the self-interference channel measurement setting; and measuring the self-interference generated by the measurement signal for measuring the self-interference channel based on the self-interference channel measurement setting.

In addition, according to an embodiment of the present invention, in a first node for self-interference measurement, a transceiver; and acquiring a self-interference channel measurement setting, transmitting a measurement signal for self-interference measurement based on the self-interference channel measurement setting, and using the measurement signal for self-interference channel measurement based on the self-interference channel measurement setting. It is possible to provide a first node including a control unit for controlling to measure the generated magnetic interference.

According to various embodiments of the present disclosure, it is possible to provide an improved method and apparatus for measuring interference in a wireless communication system. Also, according to various embodiments of the present disclosure, it is possible to provide a method and an apparatus for measuring self-interference during a full-duplex communication operation of an integrated access backhaul in a wireless communication system.

1 is a diagram illustrating a basic structure of a time-frequency domain that is a radio resource domain of an LTE system according to various embodiments of the present disclosure.
2 is a diagram illustrating a physical downlink control channel (PDCCH) through which downlink control information (DCI) of an LTE system is transmitted according to various embodiments of the present disclosure.
3 is a diagram illustrating an example of a basic unit of time and frequency resources constituting a downlink control channel that can be used in a 5G system according to various embodiments of the present invention.
4 is a diagram illustrating an example of a control resource region in which a downlink control channel is transmitted in a 5G system according to various embodiments of the present disclosure.
5 is a diagram illustrating an example of data transmission using a demodulation reference signal (DMRS) according to various embodiments of the present disclosure.
6A is a diagram illustrating a basic structure of a transceiver of a full-duplex communication system according to various embodiments of the present disclosure.
6B is a diagram illustrating a network composed of one or more objects connected to a core network, objects connected to the corresponding objects in a hierarchical structure, and a UE according to various embodiments of the present disclosure.
7 is a diagram illustrating an example in which an IAB-node performs communication with an IAB-donor and a UE using the same time-frequency resource using full-duplex communication according to various embodiments of the present disclosure;
8 is an IAB-donor performing downlink communication with IAB-MT (mobile termination) according to various embodiments of the present invention, and an IAB-DU (distributed unit) performs downlink communication with the UE using the same time-frequency resource. It is a drawing showing an example.
9 is a diagram illustrating an example in which the UE performs uplink communication through IAB-DU using the same time-frequency resource while IAB-MT performs uplink communication with IAB-donor according to various embodiments of the present disclosure.
10 is a flowchart illustrating an example of a downlink self-interference measurement process of a single-hop IAB node according to various embodiments of the present disclosure.
11 is a flowchart illustrating an example of a downlink self-interference measurement process of a multi-hop IAB node according to various embodiments of the present disclosure.
12 is a flowchart illustrating an example of a downlink self-interference measurement process when a plurality of IAB-nodes are connected to one IAB-donor according to various embodiments of the present disclosure.
13 is a flowchart illustrating an example of a distributed method downlink self-interference measurement process between a plurality of IAB-nodes according to various embodiments of the present disclosure.
14 is a view for explaining an operation of a node performing a self-interference channel measurement operation according to various embodiments of the present disclosure.
15 is a diagram illustrating a terminal and a base station apparatus according to various embodiments of the present invention.

A wireless communication system, for example, 3GPP's HSPA (High Speed Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2 HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE 802.16e, such as communication standards such as broadband wireless broadband wireless providing high-speed, high-quality packet data service It is evolving into a communication system.

In the LTE and NR systems, which are representative examples of the broadband wireless communication system, an orthogonal frequency division multiplexing (OFDM) method (or a cyclic prefix based orthogonal frequency division multiplex (CP-OFDM) method) is adopted in the downlink (DL). In uplink (UL), a single carrier frequency division multiple access (SC-FDMA) scheme (or a discrete Fourier transform spread OFDM (DFT-s-OFDM) scheme) or a CP-OFDM scheme is employed. Uplink is a node in which a terminal (UE; user equipment or MS; mobile station) can allocate radio resources to a plurality of terminals as a base station (gNB; generation Node B or eNB; eNode B or BS; base station). refers to a radio link through which data or control signals are transmitted, and downlink refers to a radio link through which a base station transmits data or control signals to a terminal. In the multiple access method as described above, the data or control information of each user is divided by allocating and operating the time-frequency resources to which the data or control information for each user is to be transmitted do not overlap each other, that is, orthogonality is established. make it possible

Since the 5G communication system, which is a future communication system after LTE, must be able to freely reflect various requirements of users and service providers, services that simultaneously satisfy various requirements must be supported. Services considered for the 5G communication system include enhanced Mobile BroadBand (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communication (URLLC). There is this.

In a general wireless communication system, a specific spectrum resource (hereinafter, interchangeable with a frequency resource) is exclusively allocated for a specific service. Representatively, in the case of cellular communication, the state leases a specific spectrum resource to a specific mobile communication operator, and the mobile communication operator to which the resource is allocated exclusively utilizes the resource to maintain the cellular network. However, since the spectrum allocated to each mobile communication service provider is not fully utilized except in a time-space situation where data traffic is very high, resources are wasted.

In order to solve this situation, a situation in which dynamic frequency sharing between mobile communication operators is possible may be considered. Spectrum resources with preferential use rights are allocated to each operator, but when resource usage is low, other operators may be permitted to use the resource. In the above scenario, operators do not need to allocate unnecessarily large amounts of spectrum to cope with peak traffic conditions. Therefore, the dynamic frequency sharing system between operators will become a base technology for a 6G or 5G communication system that can efficiently operate the increasingly scarce spectrum resources.

Before describing the details, frame structures of LTE and LTE-A systems will be described in more detail with reference to the drawings. The resource structure below shows the resource structures of LTE and LTE-A systems, but a similar resource structure may be applied to 5G or other communication systems.

1 is a diagram illustrating a basic structure of a time-frequency domain that is a radio resource domain of an LTE system according to various embodiments of the present disclosure. In FIG. 1 , the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The minimum transmission unit in the time domain is an OFDM symbol, and N _symb (101) OFDM symbols are gathered to form one slot 102, and two slots are gathered to form one subframe 103. . The length of the slot 102 is 0.5 ms, and the length of the subframe 103 is 1.0 ms. And the radio frame 104 is a time domain unit consisting of 10 subframes. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth consists of a total of N _BW 105 subcarriers. A basic unit of a resource in the time-frequency domain is a resource element (106, Resource Element, RE), which may be represented by an OFDM symbol index and a subcarrier index. A resource block (107, resource block (RB) or physical resource block (PRB)) is defined as N _symb (101) consecutive OFDM symbols in the time domain and N _RB (108) consecutive subcarriers in the frequency domain. Accordingly, one RB 108 consists of N _symb x N _RB REs 106 . In general, the minimum transmission unit of data is the RB unit, and in the LTE system, N _symb = 7 and N _RB = 12 in general, and N _BW is proportional to the bandwidth of the system transmission band.

Next, downlink control information (DCI) in LTE and LTE-A systems will be described in detail.

In the LTE system, scheduling information for downlink data or uplink data is transmitted from the base station to the terminal through DCI. DCI is defined in various formats, whether it is scheduling information for uplink data or scheduling information for downlink data, whether it is a compact DCI with a small size of control information, and spatial multiplexing using multiple antennas is applied. A determined DCI format is applied depending on whether or not it is a DCI for power control. For example, DCI format 1, which is scheduling control information for downlink data, is configured to include at least the following control information.

- Resource allocation type 0/1 flag: Notifies whether the resource allocation method is type 0 or type 1. Type 0 allocates resources in a RBG (resource block group) unit by applying a bitmap method. The basic unit of scheduling in the LTE system is an RB expressed by time and resource domain resources, and the RBG is composed of a plurality of RBs and becomes a basic unit of scheduling in the type 0 scheme. Type 1 allows to allocate a specific RB within an RBG.

- Resource block assignment: Notifies RBs allocated for data transmission. A resource to be expressed is determined according to the system bandwidth and resource allocation method.

- Modulation and coding scheme (MCS): Notifies the modulation scheme used for data transmission and the size of the transport block, which is data to be transmitted.

- HARQ (hybrid automatic repeat request) process number (HARQ process number): Notifies the process number of HARQ.

- New data indicator (New data indicator): Notifies whether HARQ initial transmission or retransmission.

- Redundancy version: Notifies the redundancy version of HARQ.

- A transmit power control command for a physical uplink control channel (PUCCH) (transmit power control (TPC) command for PUCCH: Notifies a transmit power control command for PUCCH, which is an uplink control channel).

The DCI is transmitted through the PDCCH, which is a downlink physical control channel, through a channel coding and modulation process. A cyclic redundancy check (CRC) is attached to the DCI message payload, and the CRC is scrambled with a terminal identifier (eg, cell-radio network temporary identifier (C-RNTI)) corresponding to the identity of the terminal. Purpose of DCI Message , for example, different radio network temporary identifiers (RNTIs) are used according to UE-specific data transmission, power control command, or random access response (RAR), etc. That is, RNTI is specified. When the DCI message transmitted on the PDCCH is received, the UE checks the CRC using the assigned RNTI, and if the CRC check result is correct, the message is transmitted to the UE It can be seen that it has been

2 is a diagram illustrating a PDCCH 201 that is a downlink physical channel through which DCI of an LTE system is transmitted according to various embodiments of the present invention. According to FIG. 2, the PDCCH 201 is time-multiplexed with a physical downlink shared channel (PDSCH) 202, which is a data transmission channel, and is transmitted over the entire system bandwidth. The area of the PDCCH 201 is expressed by the number of OFDM symbols, which is indicated to the UE by a control format indicator (CFI) transmitted through a physical control format indicator channel (PCFICH). By allocating the PDCCH 201 to the OFDM symbol that comes at the beginning of the subframe, the UE can decode the DCI to which the downlink scheduling is allocated as soon as possible, and through this, the PDSCH (or downlink shared channel (DL-SCH)) There is an advantage of reducing the decoding delay, that is, the overall downlink transmission delay. One PDCCH carries one DCI message, and since a plurality of terminals can be scheduled simultaneously in downlink and uplink, a plurality of PDCCHs are simultaneously transmitted in each cell.

A cell-specific RS (CRS) 203 is used as a reference signal (RS) for decoding the PDCCH 201 . The CRS 203 is transmitted in every subframe over the entire band, and scrambling and resource mapping vary according to a cell ID (eg, PCI; physical cell ID). Since the CRS 203 is a reference signal commonly used by all terminals, terminal-specific beamforming cannot be used. Therefore, the multi-antenna transmission scheme for the PDCCH of the LTE system is limited to open-loop transmit diversity. The number of ports of the CRS is implicitly known to the UE from decoding of a physical broadcast channel (PBCH).

Resource allocation of the PDCCH 201 is based on a control-channel element (CCE), and one CCE includes 9 resource element groups (REGs), that is, a total of 36 REs (one REG consists of 4 REs). is composed of The number of CCEs required for a specific PDCCH 201 may be 1, 2, 4, or 8, depending on the channel coding rate of the DCI message payload. As described above, the number of different CCEs is used to implement link adaptation of the PDCCH 201 . The UE needs to detect a signal without knowing information about the PDCCH 201. In the LTE system, a search space indicating a set of CCEs is defined for such blind decoding. The search space consists of a plurality of sets at the aggregation level (AL) of each CCE, which is not explicitly signaled and can be implicitly defined through a function and a subframe number by a terminal identity. . In each subframe, the UE performs decoding on the PDCCH 201 for all possible resource candidates that can be made from CCEs in the configured search space, and information declared valid for the UE through CRC verification. to process

The search space is classified into a UE-specific search space and a common search space. Since the UE-specific search space is not explicitly signaled and is implicitly defined through a function and a subframe number by the UE identity, the UE-specific search space may change according to the subframe number, so it is searched according to time It means that the space can be changed. Through this, the problem that a specific terminal cannot use the search space by other terminals among terminals (defined as a blocking problem) can be solved. If any UE cannot be scheduled in the subframe because all CCEs it examines are already being used by other UEs scheduled in the same subframe, since this search space changes with time, in the next subframe Problems like this may not occur. For example, even if a part of the UE-specific search space of UE#1 and UE#2 overlaps in a specific subframe, since the UE-specific search space changes for each subframe, the overlap in the next subframe is expected to be different can do.

In the case of the common search space, since a certain group of terminals or all terminals must receive the PDCCH, it is defined as a set of promised CCEs. That is, the common search space does not change according to the identity of the terminal or the subframe number. A group of terminals or all terminals may search the common search space of the PDCCH 201 to receive cell-common control information such as dynamic scheduling or paging messages for system information. For example, the UE may receive scheduling allocation information of a DL-SCH for transmission of a System Information Block (SIB)-1 including operator information of a cell by examining the common search space of the PDCCH 201 . In addition, although the common search space exists for transmission of various system messages, it can also be used to transmit control information of individual terminals. Through this, the common search space can also be used as a solution to the problem that the terminal does not receive scheduling due to insufficient resources available in the terminal-specific search space.

The search space for the LTE PDCCH is defined as shown in Table 1 below.

[Table 1]

In the LTE system, the UE has a plurality of search spaces according to each AL. In the LTE system, the number of PDCCH candidates to be monitored by a UE in a search space defined according to AL is defined in Table 2 below.

[Table 2]

According to Table 1, in the case of the UE-specific search space, AL {1, 2, 4, 8} is supported, and in this case, {6, 6, 2, 2} PDCCH candidates are each. In the case of the common search space 302, AL {4, 8} is supported, and in this case, it has {4, 2} PDCCH candidates, respectively. The reason why AL supports only {4, 8} in the common search space is to improve coverage characteristics because a system message generally has to reach the cell edge.

DCI transmitted in the common search space is defined only for a specific DCI format such as 0, 1A, 3, 3A, or 1C corresponding to a system message or power control for a UE group. DCI format with spatial multiplexing is not supported in the common search space. The downlink DCI format to be decoded in the UE-specific search space varies according to a transmission mode configured for the corresponding UE. Since the configuration of the transmission mode is made through radio resource control (RRC) signaling, an exact subframe number for when the configuration takes effect for the corresponding terminal is not specified. Accordingly, the UE can operate while maintaining the connected state by always performing decoding on DCI format 1A regardless of the transmission mode.

In the above, a method and a search space for transmitting and receiving a downlink control channel and downlink control information in LTE and LTE-A have been described. Hereinafter, a downlink control channel in a 5G communication system will be described in more detail with reference to the drawings.

3 is a diagram illustrating an example of a basic unit of time and frequency resources constituting a downlink control channel that can be used in a 5G system according to various embodiments of the present invention. According to FIG. 3, the basic unit (REG) of time and frequency resources constituting the control channel is composed of 1 OFDM symbol 301 on the time axis and 12 subcarriers 302 on the frequency axis, that is, 1 RB. Consists of. In configuring the basic unit of the control channel, the data channel and the control channel can be time-multiplexed within one subframe by assuming that the time axis basic unit is one OFDM symbol 301 . By placing the control channel in front of the data channel, the processing time of the user can be reduced, so it is easy to satisfy the latency requirement. By setting the frequency axis basic unit of the control channel to 1 RB 302, frequency multiplexing between the control channel and the data channel can be performed more efficiently.

By concatenating the REG 303 shown in FIG. 3 , it is possible to set a control resource set (CORESET) of various sizes. For example, if a basic unit to which a downlink control channel is allocated in a 5G system is referred to as a CCE 304 , one CCE 304 may be composed of a plurality of REGs 303 . If the REG 303 shown in FIG. 3 is described as an example, the REG 303 may be composed of 12 REs, and if 1 CCE 304 is composed of 6 REGs 303, 1 CCE 304 is It means that it can be composed of 72 REs. When the control resource region is configured, the corresponding region may be composed of a plurality of CCEs 304, and a specific downlink control channel may be mapped and transmitted to one or more CCEs 304 according to an AL in the control resource region. CCEs 304 in the control resource region are identified by numbers, and in this case, numbers may be assigned according to a logical mapping method.

The basic unit of the downlink control channel shown in FIG. 3 , that is, the REG 303 , may include both REs to which DCI is mapped and a region to which the DMRS 305 , which is a reference signal for decoding them, is mapped. As in FIG. 3 , the DMRS 305 may be transmitted in three REs within one REG 303 . For reference, since the DMRS 305 is transmitted using the same precoding as the control signal mapped in the REG 303, the terminal can decode the control information without information about which precoding the base station has applied.

4 is a diagram illustrating an example of a control resource region in which a downlink control channel is transmitted in a 5G system according to various embodiments of the present disclosure. In FIG. 4, two control resource regions (control) within a system bandwidth 410 on the frequency axis and one slot 420 on the time axis (in the example of FIG. 4, 1 slot is assumed to be 7 OFDM symbols, but may be 14 symbols) An example in which resource area #1 (401) and control resource area #2 (402)) is set is shown. The control resource regions 401 and 402 may be configured as a specific sub-band 403 within the entire system bandwidth 410 on the frequency axis. As a time axis, one or a plurality of OFDM symbols may be set, and this may be defined as a control resource set duration 404 . In the example of FIG. 4 , the control resource region #1 401 is set to a control resource region length of 2 symbols, and the control resource region #2 402 is set to a control resource region length of 1 symbol.

The control resource region in the 5G system described above may be configured by the base station to the terminal through higher layer signaling (eg, system information, master information block (MIB), radio resource control (RRC) signaling). Setting the control resource region to the terminal means providing at least one of information such as the location of the control resource region, a subband, resource allocation of the control resource region, and the length of the control resource region. For example, the information for setting the control resource region below may include at least one of the information in Table 3 below.

[Table 3]

In addition to the configuration information of Table 3 above, various pieces of information necessary for transmitting the downlink control channel may be configured for the terminal.

Next, DCI in the 5G system will be described in detail.

In the 5G system, scheduling information for uplink data transmitted on a physical uplink shared channel (PUSCH) or downlink data transmitted on a PDSCH is transmitted from a base station to a terminal through DCI. The UE may monitor a DCI format for fallback and a DCI format for non-fallback for PUSCH or PDSCH. The DCI format for countermeasures may consist of a field fixed between the base station and the terminal, and the DCI format for non-prevention may include a configurable field.

Countermeasure DCI for scheduling PUSCH may include, for example, information in Table 4 below.

[Table 4]

Non-preparation DCI for scheduling PUSCH may include, for example, information in Table 5 below.

[Table 5]

The countermeasure DCI for scheduling the PDSCH may include, for example, the information in Table 6 below.

[Table 6]

The non-preparation DCI for scheduling the PDSCH may include, for example, the information in Table 7 below.

[Table 7]

The DCI may be transmitted through a PDCCH through a channel coding and modulation process. A CRC is attached to the DCI message payload, and the CRC is scrambled with an RNTI corresponding to the identity of the UE. Different RNTIs are used according to the purpose of the DCI message, for example, UE-specific data transmission, a power control command, or a random access response. That is, it means that the RNTI is not explicitly transmitted, but is transmitted while being included in the CRC calculation process. Upon receiving the DCI message transmitted on the PDCCH, the UE checks the CRC using the assigned RNTI.

For example, DCI scheduling PDSCH for system information (SI) may be scrambled with system information-RNTI (SI-RNTI). DCI scheduling the PDSCH for the RAR message may be scrambled with a random access-RNTI (RA-RNTI). DCI scheduling a PDSCH for a paging message may be scrambled with a paging-RNTI (P-RNTI). DCI notifying a slot format indicator (SFI) may be scrambled with a slot format indicator-RNTI (SFI-RNTI). DCI notifying transmit power control (TPC) may be scrambled with transmit power control-RNTI (TPC-RNTI). DCI for scheduling UE-specific PDSCH or PUSCH may be scrambled with C-RNTI (Cell-RNTI).

When a specific terminal receives a data channel, ie, PUSCH or PDSCH, scheduled through the PDCCH, data is transmitted/received along with DMRS in the corresponding scheduled resource region. 5 is a diagram illustrating an example of data transmission using DMRS according to various embodiments of the present invention.

는 LTE 및 LTE-A 시스템의 경우에 15kHz이고 5G 시스템의 경우 {15, 30, 60, 120, 240, 480}kHz 중 하나가 사용된다.According to FIG. 5, an example is shown in which a specific terminal uses 14 OFDM symbols as one slot (or subframe) in downlink, PDCCH is transmitted in the first two OFDM symbols, and DMRS is transmitted in the third symbol. . In the case of FIG. 5, downlink data in a specific RB in which the PDSCH is scheduled is transmitted by being mapped to REs in which DMRS is not transmitted in the third symbol and REs from the fourth to the last symbol thereafter. Subcarrier spacing represented in FIG. 5

is 15 kHz for LTE and LTE-A systems, and one of {15, 30, 60, 120, 240, 480} kHz is used for 5G systems.

Meanwhile, as described above, in order to measure the downlink channel state in the cellular system, the base station needs to transmit a reference signal. In the case of the 3GPP Long Term Evolution Advanced (LTE-A) system, the terminal can measure the channel state between the base station and the terminal using a CRS or CSI-RS (channel state information-reference signal) transmitted by the base station. The channel state should be measured in consideration of various factors, which may include an amount of interference in downlink. The amount of interference in the downlink includes an interference signal and thermal noise generated by an antenna belonging to an adjacent base station, and the amount of interference in the downlink is important for the UE to determine the downlink channel condition. For example, when a signal is transmitted from a base station having one transmit antenna to a terminal having one receive antenna, the terminal receives the energy per symbol that can be received in downlink from the reference signal received from the base station and simultaneously receives the symbol in the section receiving the corresponding symbol. Es/Io must be determined by judging the amount of interference to be made. The determined Es/Io is converted into a data transmission rate or a value corresponding thereto and transmitted to the base station in the form of a channel quality indicator (CQI), and is used for the base station to determine which data transmission rate to transmit to the terminal. can be used

In the case of the LTE-A system, the terminal feeds back information on the downlink channel state to the base station so that it can be utilized for downlink scheduling of the base station. That is, the terminal measures the reference signal transmitted by the base station in the downlink and feeds back information extracted thereto to the base station in the form defined by the LTE/LTE-A standard. As described above, information fed back by the UE in LTE/LTE-A may be referred to as channel state information, and the channel state information may include the following three pieces of information.

- Rank Indicator (RI): The number of spatial layers that the UE can receive in the current channel state

- Precoding Matrix Indicator (PMI): An indicator for a precoding matrix preferred by the UE in the current channel state

- Channel Quality Indicator (CQI): The maximum data rate that the UE can receive in the current channel state.

CQI may be replaced with a signal to interference plus noise ratio (SINR) that can be utilized similarly to the maximum data rate, the maximum error correction code rate and modulation method, data efficiency per frequency, etc. there is.

The RI, PMI, and CQI are related to each other and have meaning. For example, a precoding matrix supported by LTE/LTE-A is defined differently for each rank. Therefore, the PMI value X when RI has a value of 1 and the PMI value X when RI has a value of 2 may be interpreted differently. Also, when the UE determines the CQI, it is assumed that the PMI and X notified to the base station are applied by the base station. That is, the UE reporting RI_X, PMI_Y, and CQI_Z to the base station is equivalent to reporting that the UE can receive the data rate corresponding to CQI_Z when the rank is RI_X and PMI_Y is PMI_Y. In this way, when the terminal calculates the CQI, it is assumed that the base station is to perform the transmission method so that the optimized performance can be obtained when the actual transmission is performed in the corresponding transmission method.

In LTE/LTE-A, RI, PMI, and CQI, which are channel state information fed back by the UE, may be fed back in a periodic or aperiodic form. When the base station intends to aperiodically acquire channel state information of a specific terminal, the base station aperiodic feedback indicator (or channel state information request field, channel state) included in downlink control information (DCI) for the terminal Information request information) may be used to perform aperiodic feedback (or aperiodic channel state information reporting). In addition, when the terminal receives an indicator configured to perform aperiodic feedback in the nth subframe, the terminal includes aperiodic feedback information (or channel state information) in data transmission in the n+kth subframe to perform uplink transmission. can do. Here, k is a parameter defined in the 3GPP LTE Release 11 standard. In Frequency Division Duplexing (FDD), k is 4, and in Time Division Duplexing (TDD), it may be defined as shown in [Table 8].

[Table 8] k value for each subframe number n in TDD UL/DL configuration

When aperiodic feedback is configured, feedback information (or channel state information) includes RI, PMI, and CQI, and RI and PMI may not be fed back according to feedback configuration (or channel status report configuration).

An in-band full duplex (hereinafter referred to as full duplex) system is different from a time division transmission/reception (TDD) or frequency division transmission/reception (FDD) system in the same band and time resource within the same cell's uplink signal and downlink. It is a system in which link signals are transmitted simultaneously. That is, in a full-duplex system, uplink and downlink signals exist in the same cell, which acts as interference.

The type of interference that appears additionally due to the use of a full-duplex system can be classified into two types: self-interference and cross-link interference.

Self-interference is interference received (or generated) from the base station's own downlink transmission in the same band when the base station receives the terminal's uplink and/or from its uplink transmission when the terminal is equipped with a full-duplex operation function. Interference that is received (or generated). Since self-interference occurs at a close distance compared to a desired signal, the signal to interference and noise ratio (SINR) of the desired signal is greatly reduced. Therefore, the transmission performance of the full-duplex system is greatly affected by the performance of the self-interference cancellation technology.

Cross-interference means interference received from downlink transmission of another base station received in the same band when the base station receives uplink from the terminal and/or interference received from uplink transmission from another terminal when the terminal receives downlink. In the case of cross-interference in which a base station receiving an uplink signal receives from downlink transmission of another base station, the distance between the interfering transmitting end and the interfering receiving end is greater than the distance between the receiving end of the base station and the terminal transmitting the request signal of the base station, but Since the transmit power is generally greater than 10-20 dB compared to the transmit power of the terminal, the received SINR performance of the uplink desired signal of the terminal received by the base station may be greatly affected. Also, the terminal receiving the downlink may receive cross-interference from another terminal using the uplink in the same band. In this case, when the distance between the interference terminal and the downlink receiving terminal is significantly closer than the distance between the base station and the downlink receiving terminal, the downlink desired signal reception SINR performance of the terminal may be lowered. In this case, the meaningfully close case means that the reception power of the interference from the uplink terminal in the downlink receiving terminal is greater than or similar to the received signal from the base station in the downlink receiving terminal, so that the downlink reception SINR performance of the terminal may be lowered. It means being close enough to be there.

In a cellular-based mobile communication system, the full-duplex system is divided into a type in which only a base station supports self-interference cancellation to support a full-duplex operation, or a type in which both the base station and the terminal support. The reason that the case where only the terminal has the interference cancellation function is not considered is that the implementation of the antenna separation magnetic interference cancellation, RF-circuit magnetic interference cancellation, and digital magnetic interference cancellation functions, which are components, is necessary from the base station to the terminal in terms of form factor size and circuit structure. This is because it can be implemented more easily. The type of full-duplex system considered in various embodiments of the present invention basically considers the case where the base station has the self-interference cancellation function for convenience of explanation, but in various embodiments of the present invention, only the base station has the self-interference cancellation function In addition, even when both the terminal and the base station have the self-interference cancellation function, the same can be applied and operated. Meanwhile, in various embodiments of the present invention, for convenience of description, an operation for self-interference measurement of an IAB node as an example of a base station will be described. However, the embodiment of the present invention can be equally applied to other base stations for measuring self-interference as well as the IAB node. For example, a base station other than the IAB node receives a configuration for self-interference channel measurement from an upper node or a third base station, and in the resource indicated by the self-interference channel measurement configuration, the other base station is used for self-interference measurement. A signal may be transmitted, and the self-interference channel may be measured based on the signal.

6A illustrates a transceiver having a self-interference cancellation function, which is a major component of a full-duplex system according to various embodiments of the present disclosure. In this case, the structure of the transceiver is equally applicable to the base station and the terminal, and the structure of any one of the base station and the terminal is not specified. However, in the following embodiment of the present invention, it is basically assumed that the base station has a self-interference cancellation function and constitutes a full-duplex system.

In FIG. 6A, the components of the base station are a transmitter 610 for transmitting a downlink signal to the terminal, a self-interference canceller 620 for self-interference cancellation, and a receiver 630 for receiving an uplink signal from the terminal. can In this case, the detailed configuration method of each component may vary depending on the implementation method of the base station. The interference cancellation unit 620 may be defined as a control unit. In addition, the control unit may include at least one processor.

6B is a diagram illustrating a network composed of one or more objects 640 connected to a core network and objects 650 and UE 660 connected to the objects in a hierarchical structure according to various embodiments of the present disclosure. .

Referring to FIG. 6B , there may be a plurality of objects 640 directly connected to the core network in one cell. Alternatively, there may be no object 640 directly connected to the core network in one cell, and only the object 650 hierarchically connected from an object directly connected to the core network of an adjacent cell may exist. In general, the object 640 directly connected to the core network in NR may be a gNB, and the object 650 hierarchically connected to the object 640 is a gNB, a small cell, or an integrated access backhaul (Integrated Access). Backhaul, IAB) or relay. Various embodiments of the present invention assume that the object 650 hierarchically connected to the object 640 directly connected to the core network supports full-duplex communication in the network situation as shown in FIG. 6B . In addition, in various embodiments of the present invention, it is assumed and described that the object 650 hierarchically connected to the object 640 directly connected to the core network is an integrated access backhaul (IAB).

An Integrated Access Backhaul (IAB) network is a network that can improve network densification caused by physical limitations of wired backhaul, and especially expand the network to high-frequency bands. Base stations communicate with UEs over radio access links. One base station (IAB-donor) is connected to the optical fiber backhaul link, and other base stations (IAB-nodes) communicate wirelessly with the IAB-donor or perform wireless communication between IAB-nodes. Between IAB-nodes wirelessly connected to the backhaul link, the upper level IAB-node close to the IAB-donor becomes the parent IAB or upper IAB, and the lower level IAB close to the UE becomes the child IAB or lower IAB. At least one base station in direct communication with the core network may serve as a root node. An IAB-node connected by a wireless backhaul link wirelessly communicates with one or more other IAB-node nodes to exchange information, and may function as an anchor for communicating with the core network. In various embodiments of the present invention, it is assumed and described that the IAB-node of the integrated access backhaul network is a base station operating in a full-duplex system.

7 is a diagram illustrating an example in which an IAB-node performs communication with an IAB-donor and a UE using the same time-frequency resource using full-duplex communication according to various embodiments of the present disclosure.

Referring to FIG. 7 , the IAB-node 706 supporting full-duplex communication uses the same time-frequency resource to perform communication between the IAB-donor 700 and the IAB-MT 704 while performing (720) the IAB-DU. Perform 722 communication between the 702 and the UE 708 . At this time, when the communication direction of the link 720 between the IAB-donor 700 and the IAB-MT 704 and the communication direction of the link 722 between the IAB-DU 702 and the UE 708 coincide with each other, Self-interference 724 may occur between the IAB-DU 702 and the IAB-MT 704 . That is, when the downlink transmission from the IAB-donor 700 to the IAB-MT 704 and the downlink transmission from the IAB-DU 702 to the UE 708 are performed in the same time-frequency resource, the IAB-DU Magnetic interference from 702 to IAB-MT 704 may occur. In addition, when the uplink transmission from the IAB-MT 704 to the IAB-donor 700 and the uplink transmission from the UE 708 to the IAB-DU 702 are performed in the same time-frequency resource, IAB-MT ( Self-interference from 704 to IAB-DU 702 may occur.

8 is a diagram illustrating an example in which an IAB-DU performs downlink communication to a UE using the same time-frequency resource while an IAB-donor performs downlink communication with IAB-MT according to various embodiments of the present disclosure.

Referring to FIG. 8 , in a time-frequency resource in which the IAB-donor 800 performs downlink 820 transmission to the IAB-MT 804 , the IAB-DU 802 downlinks 822 to the UE 808 . ), DU-to-MT self-interference 824 from the IAB-DU 802 to the IAB-MT 804 occurs. In order to prevent degradation of the downlink signal quality of the IAB-donor received by the IAB-MT 804, the IAB-node 806 estimates the DU-to-MT self-interference channel to prevent the DU-to-MT self-interference 824. can be removed When estimating the DU-to-MT self-interference channel, the signal transmitted by the IAB-donor 800 downlink 820 to the IAB-MR 804 acts as an interference signal for the DU-to-MT self-interference channel. . Therefore, the IAB-node (806) is the IAB-donor (800) to the IAB-MT (804) to the IAB-MT (804) is the optimal time-frequency resource to measure the DU-to-MT self-interference channel using frequency resources. A self-interference channel measurement result can be obtained.

On the other hand, the IAB-node (806) is the time-frequency resource used for DU-to-MT self-interference measurement even in the case of not receiving the IAB-MT (804) downlink scheduling from the IAB-donor (800) IAB Can't tell if it's being used by -donor(800). That is, in the time-frequency resource used by the IAB-node 806 to measure DU-to-MT self-interference, the IAB-donor 800 transmits a downlink to the MT or UE of another IAB-node. can't perceive In this case, the signal transmitted by the IAB-donor (800) to the MT of another IAB-node in the DU-to-MT self-interference channel measured by the IAB-node (806) acts as an interference signal, and the IAB-node (806) There may exist a case in which the self-interference channel is measured inaccurately.

In various embodiments of the present invention, the IAB-donor 800 may transmit or exchange information for measuring an interference channel with the IAB-node 806 . The IAB-donor 800 may transmit information including at least one of uplink and downlink transmission time-frequency resources and a self-interference measurement indicator to the IAB-node 806, and the IAB-node 806 is a designated resource. can be used to perform DU-to-MT self-interference measurement. At this time, the IAB-donor (800) does not use the corresponding resource or transmits the resource by lowering the transmission power, etc. The level of the interference signal generated in the DU-to-MT self-interference measurement of the IAB-node (806). can lower

According to various embodiments of the present disclosure, information for self-interference measurement of the IAB-node may be exchanged between the IAB-donor and the IAB-node through RRC, medium access control (MAC) control element (CE), or DCI. .

9 is a diagram illustrating an example in which the UE performs uplink communication through IAB-DU using the same time-frequency resource while IAB-MT performs uplink communication with IAB-donor according to various embodiments of the present disclosure.

Referring to FIG. 9 , in a time-frequency resource in which an IAB-MT 904 performs uplink 920 transmission to an IAB-donor 900, a UE 908 to an IAB-DU 902 to an uplink 922 ), MT-to-DU self-interference 924 occurs from the IAB-MT 904 to the IAB-DU 902 . In order to prevent degradation of the uplink signal quality of the UE 908 that the IAB-DU 902 receives, the IAB-node 906 estimates the MT-to-DU self-interference channel to perform the MT-to-DU self-interference 924 . can be removed. When estimating the MT-to-DU self-interference channel, the signal transmitted by the UE 908 in the uplink 922 to the IAB-DU 902 acts as an interference signal for the MT-to-DU self-interference channel. Therefore, the IAB-node 906 is the optimal self-interference when the UE 908 measures the MT-to-DU self-interference channel using a time-frequency resource that does not transmit uplink to the IAB-DU 902 . Channel measurement results can be obtained. In various embodiments of the present disclosure, the IAB-node 906 may perform MT-to-DU self-interference measurement using a resource that is not allocated as the uplink resource of the UE 908 . Alternatively, after requesting the UE 908 to prohibit the use of a specific time-frequency resource, the IAB-node 906 may perform MT-to-DU self-interference measurement on the corresponding resource.

10 is a flowchart illustrating an example of a downlink self-interference measurement process of a single-hop IAB node according to various embodiments of the present disclosure.

Referring to FIG. 10 , the IAB-donor 1004 or the parent IAB (not shown) may transmit 1020 a self-interference channel measurement configuration to the IAB-node 1002 . The self-interference channel measurement setting includes at least one of a time to measure self-interference, a frequency resource to measure self-interference, an SI measurement indication, a self-interference measurement period, a self-interference measurement beam configuration, and offset information. may be included. The self-interference measurement indicator may indicate whether to perform the self-interference measurement operation. When the self-interference measurement indicator is omitted, the self-interference measurement may be implicitly instructed according to the self-interference channel measurement setting, or the self-interference channel measurement setting may be performed according to the self-interference channel measurement setting and a preset trigger condition. The beam configuration may include at least one of information such as a beam type for self-interference measurement, a beam index, and quasi co location (QCL) information. The IAB-donor 1004 may provide a self-interference channel measurement configuration set including a plurality of self-interference channel measurement configurations to the IAB-node 1002 . A specific self-interference channel measurement setting may be used according to a preset condition among the plurality of self-interference channel measurement settings, and a self-interference channel measurement setting may be selected according to a resource used by the IAB-node 1002 . In addition, if the IAB-node 1002 provides the IAB-node 1002 with a configuration or a configuration candidate group to be used by the IAB-node 1002 in the set, the IAB-donor 1004 provides for at least one of the requested configurations. The use of self-interference channel measurement settings may be authorized. According to an embodiment of the present disclosure, the self-interference channel measurement configuration may be transmitted as an RRC message, and in various embodiments of the present disclosure, there is no limitation on a message transmission method.

The IAB-node 1002 requests a self-interference measurement instruction to the IAB-donor 1004 when it is determined that self-interference measurement is required other than when the self-interference measurement setting is designated by the IAB-donor 1004 (SI measurement indication request). It is possible to transmit information for (1022). For example, when a new terminal is introduced into the coverage of the IAB-node 1002, when the beam transmitted to the terminal 1000 is changed, when the reception packet decoding failure rate is greater than or equal to a threshold value, etc., the IAB-node 1002 Information for a self-interference measurement instruction request may be transmitted to the IAB-donor 1004 . The information or message for the self-interference measurement instruction request may include at least one of a time resource for measuring self-interference, a frequency resource, a self-interference measurement indication, a self-interference measurement period, and a self-interference measurement beam configuration (1022). ). To this end, information on resources, etc. that can be requested by the IAB-node 1002 may be preset or received in advance from the IAB-donor 1004 . The frequency resource may be a frequency resource in which self-interference is estimated to occur. In response to the self-interference measurement instruction request message of the IAB-node 1002, the IAB-donor 1004 is information indicating specific information among the information transmitted to the self-interference channel measurement setting through an RRC message or the like, or newly configured self-interference. Time resource to measure, frequency resource, self-interference measurement indication or simply IAB-node (1002) to transmit a message including at least one information of the approval indication for all or part of the requested information to the IAB-node (1002) may (1024). In addition, the IAB-node (1002) may provide interferometric information to the IAB-donor (1004), the IAB-donor (1004) based on the interferometric information to the IAB-node (1002) the self-interference measurement settings. may provide.

The IAB-donor 1004 does not use the time-frequency resource indicated through 1020 or 1024 operation (eg, using ZP-CSI-RS), or lowers the transmission power for the resource, or is critical to the IAB-node By not using a beam that generates more than a value of interference, the level of the interference signal generated in the self-interference measurement of the IAB-node 1002 can be reduced ( 1042 ).

The IAB-node 1002 measures the DU-to-MT self-interference channel by measuring the signal received by the IAB-MT while transmitting 1026 a signal from the time-frequency resource to the corresponding resource for measuring the self-interference channel ( 1040). For example, while transmitting a downlink signal through the IAB-DU of the IAB-node 1002, the signal received by the IAB-MT of the IAB-node 1002 is measured to measure the DU-to-MT self-interference channel. can do. Alternatively, a signal transmitted by the IAB-DU of the IAB-node 1002 may use a pre-defined signal, or a control signal or data signal transmitted through the UE downlink may be used. The IAB-node 1002 may transmit an arbitrary signal to the corresponding resource for DU-to-MT self-interference measurement even when there is no UE to transmit downlink. The resource through which the signal is transmitted may be any resource configurable by the IAB-node 1002 as well as a reference signal resource such as CSI-RS, DM-RS, and CRS generally used for channel measurement. For example, the IAB-MT may measure the self-interference channel from all or part of the SSB, PDCCH, or PDSCH resources transmitted by the IAB-DU. This is because the IAB-MT accurately knows the signal transmitted by the IAB-DU in the same IAB-node 1002 .

In addition, the IAB-node 1002 may measure the self-interference channel for each subset of the beam belonging to the beam set being operated in each self-interference measurement resource. For example, the IAB-node 1002 measures a self-interference channel with respect to a beam performing communication with the UE 1000, or measures self-interference for each beam while sweeping all or a part of all beams in operation, Self-interference can be measured for any beam.

Some of the information included in the self-interference channel measurement configuration may be configured as an RRC message, and some information may be configured through MAC CE or DCI. In addition, when at least one piece of information among self-interference channel measurement settings is set through an RRC message and a specific event occurs in the IAB-node 1002, self-interference may be measured using preset information. In addition, at least one piece of information among self-interference channel measurement settings may be configured through an RRC message, and may indicate self-interference channel measurement or trigger through MAC CE or DCI.

The message, message transmission/reception condition, and operation of each node that has transmitted and received the message described in the embodiment of FIG. 10 may be equally applied to the corresponding message and operation of the embodiment of FIGS. 11 and 12 below.

11 is a flowchart illustrating an example of a downlink self-interference measurement process of a multi-hop IAB node according to various embodiments of the present disclosure.

Referring to FIG. 11 , operations 1120 , 1122 , and 1124 may correspond to operations 1020 , 1022 , and 1024 of FIG. 10 . Also, operations 1126 , 1128 , and 1130 may correspond to operations 1120 , 1122 , and 1124 of FIG. 11 or operations 1020 , 1022 , and 1024 of FIG. 10 . Also, operations 1040 , 1042 , and 1026 of FIG. 10 may be equally applied to the corresponding operations of FIG. 11 .

In the multi-hop IAB structure, the lower IAB node 1102 receives (1126) self-interference channel measurement configuration information from the upper IAB node 1104. At this time, the self-interference channel measurement setting information 1126 may be information generated by the upper IAB node 1104, and the self-interference measurement information 1120 received by the upper IAB node 1104 from the IAB-donor 1106. may be part or all of. In addition, in the information 1122 requesting the self-interference measurement instruction transmitted by the upper IAB-node 1104 to the IAB-donor 1106, the lower IAB-node 1102 is the self transmitted to the upper IAB-node 1104. Part or all of the interference measurement indication request information 1128 may be included. In addition, in the self-interference measurement instruction message 1130 transmitted by the upper IAB-node 1104 to the lower IAB-node 1102, the upper IAB-node 1104 receives the self-interference measurement instruction from the IAB-donor 1106 All or part of the message 1124 may be included. In this case, message transmission and reception may be performed in the order of operation 1128, operation 1122, operation 1124, and operation 1130.

After the upper IAB-node 1104 configures the self-interference measurement resource of the lower IAB-node 1102, the upper IAB-node 1104 may transmit a message including the corresponding configuration information to the IAB-donor 1106. (1132). This is to perform (1140) a muting operation or a ZP-CSI-RS related operation for the IAB-donor 1106 not to cause interference in the self-interference measurement resource of the lower IAB-node 1102. In addition, in operation 1139, the IAB-donor 1106 may perform a muting operation or a ZPI-CSI-RS related operation for not generating interference in the self-interference measurement resource of the upper IAB-node 1104 . In operation 1135, the upper IAB node 1104 may perform a DU-to-MT self-interference channel measurement operation. Meanwhile, in order to perform operation 1135, the self-interference transmission operation 1134 may be transmission for the lower IAB node 1102 or SI transmission for the UE 1100 or another UE.

In operation 1141, the upper IAB node 1104 may perform a muting operation or ZP-CSI0RS related operation for not generating interference in the self-interference measurement resource of the lower IAB node 1102. The upper IAB-node 1104 may perform operation 1141 based on the message received in operation 1128 from the lower IAB-node 1102 or the message received in operation 1124 from the IAB-donor 1106 .

In operation 1143, the lower IAB node 1102 transmits a signal for self-interference channel measurement, and in operation 1145, the lower IAB node 1102 may perform a self-interference channel measurement operation. Self-interference may correspond to DU-to-MT self-interference channel measurement.

12 is a flowchart illustrating an example of a downlink self-interference measurement process when a plurality of IAB-nodes are connected to one IAB-donor according to various embodiments of the present disclosure.

Referring to FIG. 12 , operations 1220 , 1222 , and 1224 may correspond to operations 1020 , 1022 , and 1024 of FIG. 10 . Also, operations 1026 , 1040 , and 1042 of FIG. 10 may be equally applied to the corresponding operations of FIG. 12 . The IAB-donor 1202 uses the nearby IAB-node 1200 so that the communication of the nearby IAB-node 1200 does not act as an interference signal when measuring the self-interference of the IAB-node 1204 that performs the self-interference measurement. A resource muting message 1226 for limiting resources may be transmitted to a nearby IAB-node (1200). The resource muting message may include information such as time-frequency resource information with limited use, beam information with limited use, and maximum power level. Nearby IAB-node (1200) does not generate a signal in the resource indicated by the resource muting message, or generates interference with a very small level of power, or generates interference above a threshold value in the IAB-node 1204 that performs interference measurement. By not using , a resource muting operation 1242 can be performed for the self-interference measurement 1240 of the IAB-node 1204 to measure the self-interference signal. The IAB-donor 1202 may perform a muting or ZP-CSI-RS related operation, and in operation 1240 , the IAB-node 1204 may perform a self-interference channel measurement operation.

The IAB-donor 1202 may transmit a self-interference measurement indication message or a resource muting message by clustering a plurality of IAB-nodes in order to efficiently schedule self-interference measurement of a plurality of IAB-nodes. The clustering unit may be an IAB-node unit, a beam unit, or an IAB-node-UE pair unit.

13 is a flowchart illustrating an example of a distributed method downlink self-interference measurement process between a plurality of IAB-nodes according to various embodiments of the present disclosure.

Referring to FIG. 13 , if it is determined that self-interference measurement is required other than the case where the self-interference measurement setting is designated by the IAB-donor, the IAB node 1304 is self-interfering with other IAB-nodes 1300 and 1302 other than the IAB-donor. Information for SI channel measurement announcement may be transmitted ( 1320 ). The self-interference channel measurement notification may include information on at least one of a time for measuring self-interference, a frequency resource for measuring self-interference, and a beam configuration for measuring self-interference. The other IAB-nodes 1300 and 1302 may determine whether resource use is restricted due to the self-interference channel measurement of the IAB-node 1304 based on the information included in the self-interference channel measurement notification. Other IAB-nodes 1300 and 1302 may transmit a permission message to the IAB-node 1304 that has transmitted the self-interference channel measurement announcement ( 1322 ). In the permission message, the ID of the IAB-node that transmitted the permission message, all or part of the time resource for measuring self-interference included in the self-interference channel measurement announcement, all or part of the frequency resource for measuring self-interference, self-interference All or part of the measurement beam configuration, a measurement acceptance / non-acceptance indicator (Allow / Deny indicator) for the corresponding resource and beam configuration may be included. The other IAB-nodes (1300, 1302) do not transmit a separate permission message according to their own judgment, but resource muting (1342) based on the information included in the self-interference channel measurement announcement of the IAB-node (1304). can also be done

The IAB-node 1304 may provide a self-interference channel measurement announcement set including a plurality of self-interference channel measurement announcements to other IAB-nodes 1300 and 1302 . The other IAB-nodes 1300 and 1302 may transmit a permission message for all or part of the plurality of self-interference channel measurement announcements.

The IAB-node 1304 may perform self-interference channel measurement 1340 based on permission messages received from other IAB-nodes, or may transmit a new self-interference channel measurement notification.

14 is a view for explaining an operation of a node performing a self-interference channel measurement operation according to various embodiments of the present disclosure. The node performing the self-interference channel measurement operation may be, for example, an IAB-node, but is not limited thereto. Hereinafter, in FIG. 14 , it is referred to as a first node for convenience of description. Referring to FIG. 14 , in operation 1410 , the first node may acquire a self-interference channel measurement configuration. For example, the first node may acquire the self-interference channel measurement configuration based on operations 1020, 1022, 1024 of FIG. 10 . The self-interference channel measurement setting may include information on at least one of a time for measuring the self-interference, a frequency resource, a self-interference measurement indicator, a period, and a beam setting. In this case, the interference channel measurement configuration may be received from the second node connected to the core network node or may be obtained from the upper IAB-node.

Meanwhile, as described with reference to FIG. 10 , when a preset condition is satisfied, the terminal may transmit a self-interference measurement instruction request to the second node and receive the self-interference measurement instruction from the second node. Through this, settings necessary for performing self-interference channel measurement can be obtained.

In operation 1420, the first node may transmit a measurement signal for self-interference measurement based on the self-interference channel measurement setting. For example, the self-interference channel measurement configuration may include information such as the type, index, and the like of the measurement signal, and may include information on a resource for transmitting the measurement signal. The measurement signal may be a reference signal such as CSI-RS, CRS, DMRS, etc., may be a synchronization signal such as SSB, or may be a PDCCH transmitted by the IAB-node to the UE, a signal transmitted through a PDSCH, information, and data. . In addition, the IAB node may measure the interference channel by dividing it for each beam subset of a beam set being operated in the interference measurement resource obtained through the self-interference measurement setting.

On the other hand, the second node or upper IAB node, which has transmitted the self-interference channel measurement configuration for the interference channel measurement operation, does not transmit a signal in the resource for measuring the interference channel or has a low level that does not affect the interference on the IAB node. can perform signal transmission.

In operation 1430, the first node may measure the self-interference generated by the measurement signal for measuring the self-interference channel based on the self-interference channel measurement setting. A resource for measuring self-interference and a resource for transmitting a measurement signal may be the same or some resources may overlap.

In operation 1440, the IAB node may perform transmission of the first signal and reception of the second signal. The first signal and the second signal may be performed in the same time resource and frequency resource, or may be performed in some overlapping resources. The first signal transmitted by the IAB node may act as interference with the second signal received by the IAB node.

In operation 1450, the IAB node may cancel self-interference with respect to the second signal. For example, the IAB node may cancel self-interference caused by the first signal based on self-interference channel measurement.

15 is a block diagram illustrating a terminal and a base station apparatus according to various embodiments of the present disclosure.

15 , the terminal 1500 may include a transceiver 1510 , a controller 1520 , and a storage 1530 . However, the components of the terminal 1500 are not limited to the above-described example, and for example, the terminal 1500 may include more or fewer components than the illustrated components. In addition, the transceiver 1510 , the storage 1530 , and the controller 1520 may be implemented in the form of a single chip.

The transceiver 1510 may transmit/receive a signal to and from the base station 1540 . Here, the signal may include control information and data. To this end, the transceiver 1510 may include an RF transmitter that up-converts and amplifies a frequency of a transmitted signal, and an RF receiver that low-noise amplifies and down-converts a received signal. However, this is only an example of the transceiver 1510, and components of the transceiver 1510 are not limited to the RF transmitter and the RF receiver. In addition, the transceiver 1510 may receive a signal through a wireless channel and output it to the control unit 1520 , and transmit the signal output from the control unit 1520 through a wireless channel. In addition, the transceiver 1510 may separately include an RF transceiver for the first wireless communication technology and an RF transceiver for the second wireless communication technology, or a single transceiver according to the first wireless communication technology and the second wireless communication technology. Physical layer processing may be performed.

The storage unit 1530 may store programs and data necessary for the operation of the terminal 1500 . Also, the storage unit 1530 may store control information or data included in a signal transmitted and received by the terminal 1500 . The storage unit 1530 may be configured of a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD, or a combination of storage media. Also, there may be a plurality of storage units 1530 .

The controller 1520 may control a series of processes so that the terminal 1500 may operate according to the above-described embodiment of the present disclosure. For example, the control unit 1520 may transmit/receive data to and from the base station or another terminal based on resource allocation information received from the base station 1540 through the transceiver 1510 . There may be a plurality of control units 1520 , and the control unit 1520 may perform a component control operation of the terminal 1500 by executing a program stored in the storage unit 1530 . The controller 1520 may include at least one processor.

The base station 1540 may include a transceiver 1550 , a control unit 1560 , a connection unit 1570 , and a storage unit 1580 . However, the components of the base station 1540 are not limited to the above-described example, and for example, the base station 1540 may include more or fewer components than the illustrated components. In addition, the transceiver 1550 , the storage 1580 , and the controller 1560 may be implemented in the form of a single chip. The base station 1540 may correspond to an IAB-donor, an upper IAB node, or a lower IAB node according to various embodiments of the present disclosure.

The transceiver 1550 may transmit/receive a signal to and from the terminal 1500 . Here, the signal may include control information and data. To this end, the transceiver 1550 may include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and down-converts a received signal. However, this is only an exemplary embodiment of the transceiver 1550 , and components of the transceiver 1550 are not limited to the RF transmitter and the RF receiver. In addition, the transceiver 1550 may receive a signal through a wireless channel and output it to the control unit 1560 , and transmit the signal output from the control unit 1560 through a wireless channel.

The controller 1560 may control a series of processes so that the base station 1540 can operate according to the above-described embodiment of the present disclosure. For example, the controller 1560 may generate a message to be transmitted to another base station and transmit it to the other base station through the connection unit 1570 . There may be a plurality of control units 1560 , and the control unit 1560 may execute a program stored in the storage unit 1580 to control elements of the base station 1540 . Also, the controller 1560 may include a DSM.

The storage unit 1580 may store programs and data necessary for the operation of the base station. Also, the storage unit 1580 may store control information or data included in a signal transmitted and received by the base station. The storage unit 1580 may be configured of a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD, or a combination of storage media. Also, there may be a plurality of storage units 1540 .

The connection unit 1570 is a device that connects the base station 1540, the core network, and other base stations, and may perform physical layer processing for message transmission and reception, transmitting a message to another base station, and receiving a message from another base station. .

On the other hand, the embodiments of the present invention disclosed in the present specification and drawings are merely presented as specific examples to easily explain the technical contents of the present invention and help the understanding of the present invention, and are not intended to limit the scope of the present invention. That is, it will be apparent to those of ordinary skill in the art to which the present invention pertains that other modifications can be implemented based on the technical idea of the present invention. In addition, each of the above embodiments may be operated in combination with each other as needed.

Claims (20)

In the method of the first node for self-interference measurement,
obtaining self-interference channel measurement settings;
transmitting a measurement signal for self-interference measurement based on the self-interference channel measurement setting; and
and measuring the self-interference generated by the measurement signal for measuring the self-interference channel based on the self-interference channel measurement setting. According to claim 1,
The self-interference channel measurement setting method, characterized in that it includes at least one information of time, frequency resource, self-interference measurement indicator, period, and beam setting for measuring the self-interference. According to claim 1,
The interference channel measurement configuration method, characterized in that received from a second node connected to the core network node. According to claim 1,
transmitting a self-interference measurement instruction request to a second node; and
The method of claim 1, further comprising: receiving a self-interference measurement indication from the second node. 5. The method of claim 4,
The self-interference measurement instruction request includes at least one information of time, frequency resource, self-interference measurement indicator, period, and beam configuration for measuring the self-interference,
The self-interference measurement instruction includes at least one piece of information included in the self-interference measurement instruction request and information indicating approval of the self-interference measurement. According to claim 1,
The measurement signal is a channel state information-reference signal (CSI-RS), a demodulation reference signal (DMRS), a cell specific reference signal (CRS), a synchronization signal block (SSB), a physical downlink control channel (PDCCH), and a physical downlink (PDSCH). shared channel), characterized in that it comprises at least one of. According to claim 1,
Method according to claim 1, characterized in that the interference channel is measured by classifying it for each beam subset of a beam set being operated in the interference measurement resource obtained through the self-interference measurement setting. According to claim 1,
The node providing the interference channel measurement configuration does not use the time and frequency resources indicated according to the interference channel measurement configuration for signal transmission, or transmits a signal in a range lower than a preset threshold value. According to claim 1,
receiving a target signal; and
The method of claim 1, further comprising: canceling the magnetic interference from the target signal based on the magnetic interference measurement. The method of claim 1,
The first node is characterized in that it corresponds to an integrated access backhaul (IAB) node supporting full duplex communication (FULL DUPLEX) communication. In the first node for self-interference measurement,
transceiver; and
Obtain a self-interference channel measurement setting, transmit a measurement signal for self-interference measurement based on the self-interference channel measurement setting, generated by the measurement signal for self-interference channel measurement based on the self-interference channel measurement setting A first node comprising a control unit for controlling to measure the magnetic interference. 12. The method of claim 11,
The self-interference channel measurement setting is a first node, characterized in that it includes at least one information of time, frequency resource, self-interference measurement indicator, period, and beam setting for measuring the self-interference. 12. The method of claim 11,
The first node, characterized in that the interference channel measurement configuration is received from a second node connected to the core network node. 12. The method of claim 11, wherein the control unit,
A first node, characterized in that controlling to transmit a self-interference measurement instruction request to a second node and receive a self-interference measurement instruction from the second node. 15. The method of claim 14,
The self-interference measurement instruction request includes at least one information of time, frequency resource, self-interference measurement indicator, period, and beam configuration for measuring the self-interference,
The self-interference measurement instruction includes at least one piece of information included in the self-interference measurement instruction request and information indicating approval of the self-interference measurement. 12. The method of claim 11,
The measurement signal is a channel state information-reference signal (CSI-RS), a demodulation reference signal (DMRS), a cell specific reference signal (CRS), a synchronization signal block (SSB), a physical downlink control channel (PDCCH), and a physical downlink (PDSCH). A first node, characterized in that it comprises at least one of the shared channel). 12. The method of claim 11,
A first node, characterized in that the interference channel is measured by classifying it for each beam subset of a beam set being operated from the interference measurement resource obtained through the self-interference measurement setting. 12. The method of claim 11,
The node providing the interference channel measurement setting does not use the time and frequency resources indicated according to the interference channel measurement setting for signal transmission, or transmits a signal in a range lower than a preset threshold value. . 12. The method of claim 11, wherein the control unit,
A first node, characterized in that receiving a target signal and canceling the target signal to cancel the self-interference based on the self-interference measurement. 12. The method of claim 11,
The first node is a first node, characterized in that it corresponds to an integrated access backhaul (IAB) node supporting full duplex (FULL DUPLEX) communication.

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