Control device, relay station, and control method

Abstract

To carry out communication appropriately when non-reproduction relay is used.SOLUTION: A control device according to one aspect of the present disclosure includes a control unit that identifies a second terminal station for which interference due to non-reproduction relay between a base station and a first terminal station via a relay station is a concern, and a communication unit that notifies the relay station to stop the non-reproduction relay when a first condition related to a received signal to interference plus noise ratio (SINR) of a signal received by the second terminal station from the base station is satisfied at the time when the non-reproduction relay is performed.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to a control device, a relay station, and a control method in a mobile communication system. [Background technology]

[0002] In the New Radio (NR) technical specifications in the 3rd Generation Partnership Project (3GPP (registered trademark)), a standardization project for mobile communication systems, non-regenerative relay is introduced as a low-latency relay technology (for example, Non-Patent Document 1). Non-regenerative relay does not perform demodulation and decoding at the relay station, so relaying with low latency is possible. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] 3GPP TS 38.106 V18.1.0(2023-06) Summary of the Invention [Problem to be solved by the invention]

[0004] However, when non-regenerative relay is performed, terminal stations that do not use relay may be subjected to interference from the non-regenerative relay, resulting in deterioration of communication quality and a decrease in communication throughput.

[0005] Therefore, an object of the present disclosure is to provide a control device, a relay station, and a control method that can appropriately perform communication when non-regenerative relay is used. [Means for solving the problem]

[0006] A control device according to one embodiment of the present disclosure includes a control unit that identifies a second terminal station for which interference due to non-regenerative relay between a base station and a first terminal station via a relay station is a concern, and a communication unit that notifies the relay station to stop the non-regenerative relay when a first condition related to a received signal to interference plus noise ratio (SINR) of a signal received by the second terminal station from the base station is satisfied at the time when the non-regenerative relay is performed. Effect of the Invention

[0007] According to one aspect of the present disclosure, communication can be appropriately performed when non-regenerative relay is used. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram illustrating an example of a schematic configuration of a system according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a diagram illustrating an example of a schematic functional configuration of each device according to an embodiment of the present disclosure. [Diagram 3] FIG. 3 is a diagram illustrating an example of a schematic hardware configuration of each device according to an embodiment of the present disclosure. [Figure 4] 4A and 4B are diagrams illustrating an example of a variation of the hardware configuration of a base station according to an embodiment of the present disclosure. [Diagram 5] 5A to 5D are diagrams illustrating an example of a problem associated with non-regenerative relay. [Figure 6] FIG. 6 is a diagram illustrating an example of a first control flow according to an embodiment of the present disclosure. [Figure 7] FIG. 7 is a diagram illustrating an example of parameters for calculating γRX,min UEi. [Figure 8] FIG. 8 is a diagram showing an example of the value of DUEi. [Figure 9] FIG. 9 is a diagram showing an example of parameters for calculating γRX UEi. [Figure 10]FIG. 10 is a diagram illustrating an example of a second control flow according to an embodiment of the present disclosure. [Figure 11] FIG. 11 is a diagram illustrating an example of a third control flow according to an embodiment of the present disclosure. [Figure 12] FIG. 12 is a diagram showing an example of SS-SINR measurement report mapping. [Figure 13] FIG. 13 is a diagram showing an example of parameters for calculating IR→UEi. [Figure 14] FIG. 14 is a diagram showing an example of parameters for calculating γRX UEi,1. [Figure 15] FIG. 15 is a diagram showing an example of parameters for calculating γRX,min UEi when relay stations R1 and R2 are going to perform non-regenerative relay. [Figure 16] FIG. 16 is a diagram showing an example of parameters for calculating γRX UEi when relay stations R1 and R2 perform non-regenerative relay. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In this specification and the drawings, elements that can be similarly described may be denoted by the same reference numerals, so that duplicated description may be omitted.

[0010] In the present disclosure, "A / B" and "at least one of A and B" may be read as interchangeable. Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0011] <System configuration> 1 is a diagram showing an example of a schematic configuration of a system according to an embodiment of the present disclosure. The system 1 includes a control device 10, a base station 20, a relay station 30, and a terminal station 40. The system 1 may be called a wireless communication system, an information communication system, or the like.

[0012] For example, the system 1 is a system that complies with the Technical Specification (TS) of 3GPP. More specifically, for example, the system 1 is a system that complies with the TS of the 5th generation mobile communication system (5G) or New Radio (NR).

[0013] Note that system 1 is not limited to this example, and may include Long Term Evolution (LTE), LTE-Advanced (LTE-A), 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or a decimal)), New Radio (NR), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), and other systems that use wireless communication methods, as well as next-generation systems that are extended, modified, created, or defined based on these.

[0014] In system 1, the communication link going to (receiving) from base station 20 / going out (transmitting) from terminal station 40 may be referred to as uplink (UL), and the communication link going out (transmitting) from base station 20 / going to (receiving) from terminal station 40 may be referred to as downlink (DL).

[0015] The control device 10 may be a device on a core network to which the base station 20 is connected. The control device 10 may be called a network node and may provide network functions (Network Functions (NF)). The NF may be, for example, at least one of an Access and Mobility management Function (AMF), an Application Function (AF), a Data Network (DN), a Location Management Function (LMF), an Operation, Administration and Maintenance (Management) (OAM)), a Session Management Function (SMF), a Unified Data Management (UDM), a User Plane Function (UPF), and the like.

[0016] The core network includes, for example, an optical fiber network. In the present disclosure, the terms "network" and "core network" may be interpreted as interchangeable.

[0017] The control device 10 may control at least one of the base station 20, the relay station 30, and the terminal station 40, and may perform control to provide a communication service between the base station 20 / relay station 30 and the terminal station 40. The control device 10 may be included in the base station 20.

[0018] The base station 20 provides a radio access network (Radio Access Network (RAN)) to the terminal station 40. An area in which wireless communication is possible in the radio access network is also called a cell. The base station 20 is, for example, a gNB. The gNB is a node that provides an NR user plane and control plane protocol terminations towards the User Equipment (UE) and is connected to a 5G Core Network (5GC) via an NG interface. The base station 100 may be an en-gNB. The en-gNB is a node that provides an NR user plane and control plane protocol terminations towards the UE and operates as a secondary node in E-UTRA-NR Dual Connectivity (EN-DC).

[0019] The relay station 30 performs non-regenerative relaying of communication between the base station 20 and the terminal station 40. In non-regenerative relaying, demodulation / decoding of the relayed signal is not performed, so that the communication can be relayed with a delay that does not change the slot timing. In the present disclosure, non-regenerative relaying may mean relaying (transferring) without demodulation / decoding processing, amplification and transfer of UL / DL radio signals between the base station and the terminal station, repeating, etc. It should be noted that in the present disclosure, relaying, transferring, repeating, transmission, etc. may be interpreted as being interchangeable.

[0020] The relay station 30 may be a Radio Frequency (RF) repeater, a Network-Controlled Repeater (NCR), an Integrated Access and Backhaul (IAB), or other repeater. The relay station 30 may be called, for example, a small base station, a mobile base station, a relay base station, or the like.

[0021] For example, the NCR may include an NCR-Mobile Termination (NCR-MT) and an NCR-Forwarding (NCR-Fwd). The NCR-MT can communicate with the base station 20 via a control link (e.g., receive configuration / control information, send requests / reports). The NCR-Fwd can relay communications between the base station 20 and the terminal station 40 by relaying / amplifying from a backhaul link (with the base station 20) to an access link (with the terminal station 40) and from the access link to the backhaul link.

[0022] The relay station 30 may perform non-regenerative relay using different frequency resources or may perform non-regenerative relay using the same frequency resource for the multiple terminal stations 40. The relay station 30 may transmit non-regenerative relay signals for the multiple terminal stations 40 using frequency division multiplexing (FDM), time division multiplexing (TDM), space division multiplexing (SDM), and other multiplexing methods.

[0023] One or more relay stations 30 may share information on resources (e.g., frequency / time resources, resource blocks (RBs)) used by each terminal station 40. The information may be communicated between the relay stations 30, or may be communicated from the base station 20 to the relay station 30.

[0024] The terminal station 40 is connected to the radio access network in the above-mentioned cell and corresponds to a UE. The terminal station 40 may be, for example, a mobile terminal (mobile communication terminal) such as a smartphone, a tablet terminal, or a wearable terminal, or may be a fixed communication terminal. Each terminal station 40 may be able to directly receive a control signal transmitted by the base station 20, or may be able to receive the control signal via the relay station 30.

[0025] In the present disclosure, a terminal station to which non-regenerative relay communication is applied (in other words, a terminal station that communicates with the base station 20 via the relay station 30) is described as terminal station 40a, and a terminal station to which non-regenerative relay communication is not applied (in other words, a terminal station that communicates with the base station 20 not via the relay station 30) is also described as terminal station 40b. When simply written as terminal station 40, it may include both terminal station 40a and terminal station 40b. A terminal station that is a target of non-regenerative relay (terminal station 40a) may be called a first terminal station. A terminal station that is not a target of non-regenerative relay (terminal station 40b) may be called a second terminal station.

[0026] Each of the base station 20, relay station 30, terminal station 40, etc. may include a fixed station whose installation location is fixed, or may include a mobile station.

[0027] The unrepeated signal in DL communication may correspond to a signal transmitted from the relay station 30 to the terminal station 40. The unrepeated signal in UL communication may correspond to a signal transmitted from the relay station 30 to the base station 20.

[0028] In addition, in the system 1, TDM or Time Division Duplex (TDD) may be used, in which UL communication and DL communication are performed on the same frequency channel. Also, in the system 1, the timing of slots / frames may be synchronized (aligned) among all stations.

[0029] In addition, in the system 1, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) (or a multi-carrier waveform) may be used for at least one of the UL communication and the DL communication, or Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) (or a single-carrier waveform) may be used. In the system 1, other waveforms (e.g., Filtered OFDM (F-OFDM)) may be used for the UL / DL communication.

[0030] <Configuration of each device> An example of the configuration of each device (control device 10, base station 20, relay station 30, and terminal station 40) according to an embodiment of the present disclosure will be described.

[0031] (Functional configuration) 2 is a diagram illustrating an example of a schematic functional configuration of each device according to an embodiment of the present disclosure. For example, the control device 10 includes a control unit 110, a communication unit 120, an input / output unit 130, and a storage unit 140.

[0032] The base station 20, the relay station 30, and the terminal station 40 may also have similar functional configurations. For this reason, in Fig. 2, the reference numerals of the functional blocks corresponding to each device are also shown with the highest digit of the reference numeral (for example, the highest digit of "20" for the base station 20, "2") replaced with "1". Below, the functional blocks related to the control device 10 will be described, but it will be understood that the same description applies to the other devices.

[0033] In this example, functional blocks of the characteristic parts of the present embodiment are mainly shown, and each device may have other functional blocks necessary for other processes. Also, a configuration may be used that does not include some of the functional blocks.

[0034] The control unit 110 controls the control device 10 and provides various functions. For example, the control unit 110 may control communication with other devices via the communication unit 120. The control unit 110 may also obtain information necessary for processing based on information received via the communication unit 120. The control unit 110 may be referred to as a processing unit.

[0035] The communication unit 120 communicates (transmits / receives) with other devices via a network. The communication unit 120 may output information obtained from a received signal to the control unit 110, or may convert information input from the control unit 110 into a signal and transmit it. The communication unit 120 may be called a transmitting unit, a receiving unit, a transmitting / receiving unit, etc.

[0036] The input / output unit 130 may include an input unit that accepts input by a user operation. The input unit may be connected to a predetermined device, a storage medium, etc., and may accept input of data. The input unit may output the input result to the control unit 110, for example.

[0037] The input / output unit 130 may also include an output unit that outputs data, content, etc. in a format that can be perceived by the user. The output unit may include a display unit that displays images, an audio output unit that outputs audio, etc.

[0038] The storage unit 140 stores (holds) various information used for processing by the control device 10. The control unit 110 may instruct the storage unit 140 to read and write data.

[0039] (Hardware configuration) 3 is a diagram showing an example of a schematic hardware configuration of each device according to an embodiment of the present disclosure. Each device includes an antenna 510, a Radio Frequency (RF) circuit 520, a processor 530, a network interface 540, an input device / output device 550, a memory 560, and a storage 570.

[0040] The hardware configuration of each device may be configured to include one or more of the elements shown in Fig. 3, or may be configured to exclude some of the elements. For example, the relay station 30 and the terminal station 40 may not have the network interface 540.

[0041] The antenna 510 converts signals into radio waves and radiates the radio waves into space. The antenna 510 also receives radio waves in space and converts the radio waves into signals. The antenna 510 may include a transmitting antenna and a receiving antenna, or may include a single antenna for both transmission and reception. The antenna 510 may include a directional antenna or may include multiple antenna elements.

[0042] The relay station 30 may be equipped with a plurality of antennas 510. For example, the relay station 30 may have an antenna that is separate from the antenna used for the relay line, so that the control unit 310 can receive notifications related to control.

[0043] The RF circuitry 520 performs analog processing of signals transmitted and received via the antenna 510. The RF circuitry 520 may include filters (e.g., high frequency filters, low pass filters), amplifiers, modulators, frequency synthesizers, analog-to-digital conversion circuits, digital-to-analog conversion circuits, Inverse Fast Fourier Transform (IFFT)) processing circuits, and the like.

[0044] The RF circuit 520 may perform amplification, filtering, demodulation to a baseband signal, etc. on the received radio frequency band signal, and output the signal to the processor 530. The RF circuit 520 may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal input from the processor 530, and transmit the radio frequency band signal via the transmitting / receiving antenna 510. The RF circuit 520 may perform physical layer processing (e.g., processing of lower functions of the physical layer), and may perform beamforming processing such as analog beamforming processing and digital beamforming processing.

[0045] The processor 530 may control the entire device. The processor 530 may read programs (program codes), software (software modules), data, etc. from the storage 570 to the memory 560 and execute various processes according to the programs. The processor 530 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. The processor 530 may also include a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc.

[0046] The processor 530 may perform digital processing of signals transmitted and received via the antenna 510 and the RF circuitry 520. The digital processing may include physical layer processing (e.g., processing of functions higher than the physical layer), processing of a Medium Access Control (MAC) layer or higher, modulation, demodulation, encoding, decoding, scrambling, and other processing. The processor 530 also processes signals transmitted and received via the network interface 540.

[0047] The processor 530 may include multiple processors or may be a single processor, which may include a baseband processor for performing the digital processing described above and one or more processors for other processing (e.g., overall control).

[0048] The network interface 540 is, for example, a network adapter, and may be connected to an external network via a wired connection to send and receive signals.

[0049] It should be noted that the RF circuit 520 / baseband processor / network interface 540 may be integrated into one unit, and may be referred to as a network controller, a network card, a communication module, or the like.

[0050] The input device / output device 550 includes input devices that accept input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.), output devices that perform output to the outside (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.), and devices that combine these together (e.g., a touch panel).

[0051] The memory 560 is a computer-readable non-transitory recording medium, and stores a program executed by the processor 530, parameters related to the program, and various other information. The memory 560 may include at least one of a read only memory (ROM), an erasable programmable read only memory (EPROM), an electrically erasable programmable read only memory (EEPROM), a random access memory (RAM), and a flash memory. All or a part of the memory 560 may be included in the processor 530. The memory 560 may be called a register, a cache, a main memory, or the like.

[0052] Storage 570 is a computer-readable non-transitory recording medium and stores various information. Storage 570 may include at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (CD-ROM), a digital versatile disc, a Blu-ray (registered trademark) disk), a removable disk, a hard disk drive (HDD), a smart card, a flash memory device (e.g., a solid state drive (SSD)), and the like. Storage 570 may be referred to as an auxiliary storage device.

[0053] Furthermore, each device such as the processor 530 and the memory 560 may be connected by a bus for communicating information. A single bus may be used within the devices, or different buses may be used between the devices.

[0054] The control unit X10 (X=1, 2, 3, 4; the same applies below) may be implemented by the processor 530. The communication unit X20 may be implemented by the antenna 510 / RF circuit 520 / network interface 540. The input / output unit X30 may be implemented by the input device / output device 550. The storage unit X40 may be implemented by the memory 560 / storage 570.

[0055] (Base station hardware configuration variations) The communication processing function of the base station (RAN) may be separated into three elements: Radio Unit (RU), Distributed Unit (DU), and Central Unit (CU). The RU performs RF processing and lower functions of the physical layer. The DU performs higher functions of the physical layer, MAC layer functions, and Radio Link Control (RLC) layer functions. The CU performs Packet Data Convergence Protocol (PDCP) layer, Service Data Adaptation Protocol (SDAP), and Radio Resource Control (RRC) layer functions.

[0056] 4A and 4B are diagrams showing an example of a variation of the hardware configuration of a base station according to an embodiment of the present disclosure. In this example, for simplicity, only the antenna 510, the RF circuit 520, and the processor 530 are illustrated among the elements described in FIG. 3, but the other elements may be included in a device equipped with the processor 530.

[0057] 4A, one base station 20 includes an antenna 510, an RF circuit 520, and a processor 530. This base station 20 has a configuration in which an RU and a DU / CU are integrated.

[0058] 4B, one base station 20a includes only an antenna 510 and an RF circuit 520, and another base station 20b includes a processor 530, and these base stations are connected by an optical fiber line or the like. The former base station 20a has only an RU, and therefore may be called a child station, a distributed base station, or the like. The latter base station 20b has only a DU / CU, and therefore may be called a parent station, a central base station, or the like.

[0059] In addition, the RU / DU base station and the CU base station may be connected, or the RU base station, the DU base station, and the CU base station may be connected.

[0060] In the present disclosure, the base station 20 may include one base station (node) that realizes all the functions of the RU, DU, and CU as shown in Fig. 4A, or may include multiple base stations (nodes) that each realize some of the functions of the RU, DU, and CU as shown in Fig. 4B. For example, the base station 20 may refer to a base station composed of a distributed base station 20a and a central base station 20b.

[0061] <Task analysis> 5A-5D are diagrams showing an example of the problem associated with non-regenerative relay. Figures 5A and 5C correspond to diagrams excerpted from a part of Figure 1. In this example, it is assumed that the frequency resource of the signal transmitted from the base station 20 to the terminal station 40b and the frequency resource of the non-regenerative relay signal transmitted from the relay station 30 to the terminal station 40a are shifted (or do not overlap).

[0062] The signal to interference plus noise ratio (SINR) of the terminal station 40b is calculated by the ratio (=P / (I+N)) of the interference power level I and the noise level N to the power level P of the signal received by the terminal station 40. Note that in the present disclosure, the unit of each level may be decibel-milliwatts (dBm), dB, or the like.

[0063] As shown in FIG. 5A, when relay station 30 in system 1 is not performing non-regenerative relay (or does not exist at all), terminal station 40b does not receive interference, and the received SINR of terminal station 40b is as shown in FIG. 5B.

[0064] On the other hand, as shown in Fig. 5C, when the relay station 30 in the system 1 performs non-regenerative relay, for example, in the case of non-regenerative relay in DL, not only the relayed signal but also unwanted signals such as noise are amplified, so that interference occurs due to the non-regenerative relay signal in the frequency domain outside the frequency resource of the non-regenerative relay signal for the terminal station 40a, as shown in Fig. 5D. Therefore, the received SINR of the terminal station 40b in Fig. 5C is smaller than that in the case of Fig. 5A.

[0065] As described above, the terminal station 40b that does not use relaying may be subject to interference from non-regenerative relaying that uses the relay station 30, resulting in deterioration of communication quality and a decrease in communication throughput.

[0066] Therefore, the present inventor came up with the idea of ​​stopping / resuming non-regenerative relaying of a relay station that may be a relatively large interference source for a terminal station that does not use non-regenerative relaying. In one aspect of the present disclosure, in non-regenerative relaying in a downlink line, a terminal station (without non-regenerative relaying) that is a concern for interference is identified based on the transmission spectrum mask of the relay station. Thereafter, when interference occurs in the terminal station (for example, when the reception SINR of the terminal station is equal to or greater than a permissible value), the non-regenerative relaying is stopped. Also, when it is determined that interference will not occur in the terminal station even if non-regenerative relaying is resumed while non-regenerative relaying is stopped, the non-regenerative relaying is resumed.

[0067] <Example of operation> An example of the operation of each device according to an embodiment of the present disclosure will be described below. The communication method (wireless communication method, control method) described below may be applied to the system 1 described above.

[0068] In the following description of the present disclosure, reference numerals may be omitted. For example, a control device in the following description may refer to the control device 10.

[0069] In the following explanations and drawings, the base station may be abbreviated as BS, the relay station as R, and the terminal station as UE. Also, the subscripts indicate that the parameters are related to reception (received signal). RX Also, the subscript "parameter" is used to indicate that the parameter is related to transmission (transmission signal). TX It is sometimes expressed with the addition of .

[0070] In the following description, each device may be interpreted as one or more functional blocks (eg, control unit 110, communication unit 120) or hardware configurations (eg, RF circuit 520, processor 530) in the device.

[0071] In one embodiment of the present disclosure, the control device 10 / base station 20 / relay station 30 may select whether the relay station 30 functions as a relay station (performs non-regenerative relay) for a certain terminal station 40. The relay station 30 may perform non-regenerative relay semi-fixedly / semi-permanently. The relay station 30 may stop the non-regenerative relay when there is an instruction to stop the non-regenerative relay from the base station 20 / control device 10, or when a certain time has elapsed since the start of the non-regenerative relay or from a specific timing. The word "stop" may be interpreted as "completion," "end," or the like.

[0072] (First control flow) 6 is a diagram illustrating an example of a first control flow according to an embodiment of the present disclosure. In the first control flow, the control device determines whether to stop / resume non-regenerative relay.

[0073] In step S101, the control device identifies a terminal station (terminal station 40b) that may be interfered with when the relay station performs non-regenerative relay. i (i is, for example, an integer) may be determined based on information regarding the received SINR at the timing when the non-regenerative relay is performed.

[0074] The information regarding the received SINR may be, for example, i The worst value of the received SINR (which may be called the expected received SINR) estimated (assumed) for RX,min UEi The control device may select terminal stations that are likely to interfere with the relay station when the relay station performs non-regenerative relaying, as γ RX,min UEi ≦γ REQ UEi A terminal station (UE) that satisfies the above i It may be determined that it is.

[0075] Here, γ REQ UEi is a threshold for judgment and may be called the required SINR. REQ UEi UEi may vary for several UEs. i It may be common in γ REQ UEi UE i Location of UE i The expected received signal power of, the expected received signal quality of, i The available MCS may be determined based on at least one of the following: a Modulation and Coding Scheme (MCS) available for communication with the terminal station UE using Downlink Control Information (DCI) for a Physical Downlink Shared Channel (PDSCH). i Alternatively, the MCS may correspond to a particular (eg, maximum or minimum) or desired coding rate that can be specified.

[0076] In other words, the terminal station for which the interference is a concern may correspond to a terminal station for which the worst-case expected received SINR of a signal from a base station in the case of non-regenerative relay is equal to or less than a threshold value (required SINR).

[0077] Gamma RX,min UEi The terminal station UE i may be calculated based on at least one of the expected received signal power, the expected received interference power, and the expected noise power. For example, γ RX,min UEi may be calculated according to the following Equations 1 and 2.

[0078]

number

[0079] Here, P TX BS is the terminal station UE at the base station i The transmission power of the signal to be transmitted to L BS→UEi,pre is a base station and a terminal station UE i The estimated path loss betweenIN,max UEi is the terminal station UE i is the maximum expected interference noise power due to the non-regenerative repeat signal in the TX,max R is the maximum transmission power at the relay station, L SI R is the path loss between the receiving antenna and the transmitting antenna of the relay station, D UEi is the value obtained from a specific spectral mask of the unregenerated repeating signal, P N UEi is the terminal station UE i is the noise power.

[0080] That is, in Equation 1, P TX BS -L BS→UEi,pre The terminal station UE i In relation to the expected received signal power of TX,max R -L SI R -D UEi The terminal station UE i In relation to the expected received interference power (when the propagation loss is minimum and the relay power is maximum), P N UEi The terminal station UE i This is related to the assumed noise power of

[0081] Figure 7 shows the RX,min UEi FIG. 1 is a diagram illustrating an example of parameters for calculating i The assumed received signal from the base station and the spectrum mask of the non-regenerated relay signal from the relay station are shown in Equations 1 and 2. RX,min UEi It can be seen that it can be derived.

[0082] Figure 8 shows the D UEi The transmission spectrum mask of the unregenerative repeating signal varies depending on the frequency. This is because the power of the unregenerative repeating signal weakens as it moves away from the frequency resource used for unregenerative repeating. UEi may indicate how weak the power of the unregenerated repeated signal is depending on the frequency.

[0083] A certain resource block b and a resource block b used for non-regenerative relay R→UE(R) The frequency difference between b and b is Δf(b, b R→UE(R) ), then Δf(b, b R→UE(R) )=f c (b)-f c (b R→UE(R) ), where f c (b) is the center frequency of resource block b, and f c (b R→UE(R) ) is resource block b R→UE(R) is the center frequency.

[0084] Figure 8 shows D UEi =D UEi (Δf(b, b R→UE(R) )) and D UEi (Δf(b R→UE(R) , b R→UE(R) ))=D UEi (0)=0.

[0085] The control device is P TX BS , L BS→UEi,pre and P TX,max R The control device may know (prestore) the value of P TX BS may be determined based on a report from the base station (e.g., may be determined to be a reported value or a value indicated by reported information). SI R / P TX,max BS may be determined based on reports from relay stations (e.g., may be determined to be a reported value or a value indicated by reported information). BS→UEi,pre is the past measurement results of the base station / terminal station (specifically, the L BS→UEi ) may be derived.

[0086] The control device is D UEiRegarding the above, the specific spectrum mask may be determined to be a representative spectrum mask, or the terminal station UE i The control device may also determine whether the P N UEi It may be determined that the noise power is representative (or specific), or the terminal station UE i The representative spectrum mask or power may be determined in advance in a standard (for example, a required spectrum mask or required power value in a standard). IN UEi is multiple terminal stations UE i The same for (e.g., P IN UE0 =P IN UE1 ) or may be different for each terminal station.

[0087] In step S102, the control device instructs the relay station to perform non-regenerative relay by semi-fixed slot allocation in communication with a specific terminal station (terminal station 40a, which may be called UE(R)). This instruction may include information (setting information) on at least one of the frequency resources (subcarriers, resource blocks, etc.) to be used, time resources (e.g., timing, period, offset with respect to a certain time, etc.), and power resources (e.g., absolute value or relative value with respect to a certain power as a relay power value).

[0088] In step S103, the relay station instructed in step S102 performs relay communication with the specific terminal station by non-regenerative relay.

[0089] In addition, the relay station may not be able to detect the terminal station UE that is identified as having a risk of interference in step S101. i The information on the terminal station UE may be notified from the base station ( / control device) (for example, via a control line). iThe UE may include information for identifying the UE (e.g., a UE identifier, a Radio Network Temporary Identifier (RNTI)), or the UE i For example, the relay station may include information instructing the UE to measure the path loss of the UE. i When the base station ( / control device) notifies the terminal station UE of the information instructing it to measure the path loss of i L, the path loss between the UEi→R may be measured and reported to the base station ( / control device).

[0090] In step S104, the control device receives (or may receive) a signal from the base station at the same timing as the non-regenerative relay from the relay station. i γ RX, UEi In addition, the terminal station UE i is different from the specific terminal station that is the direct target of the non-regenerative relay.

[0091] Gamma RX UEi The terminal station UE i may be calculated based on at least one of the expected received signal power, the expected received interference power, and the expected noise power. For example, γ RX UEi may be calculated based on the following Equation 3-6:

[0092]

number

[0093] Here, L BS→UEi is a base station and a terminal station UE i The propagation loss between IN UEi is the terminal station UE i is the expected interference noise power due to the non-regenerative repeat signal in the TX R is the transmission power at the relay station, L R→UEi is the relay station and the terminal station UEi The propagation loss between TX R is transmitted from the relay station to the terminal station UE i is the SINR of the transmitted signal to the RX R is the SINR of the received signal from the base station at the relay station, and NF TX R is the noise figure (NF) of the relay station. The noise figure may be the ratio of the output SNR to the input signal to noise ratio (SNR) (=input SNR / output SNR). Also, L BS→R is the path loss between the base station and the relay station, P N R is the noise power at the relay station.

[0094] Figure 9 shows the RX UEi FIG. 1 is a diagram illustrating an example of parameters for calculating i The (direct) received signal from the base station and the received signal of the signal that is non-regeneratively relayed from the relay station to the specific terminal station are shown in Equation 3-6. RX UEi It can be seen that it can be derived.

[0095] The base station calculates the path loss L from the relay station to the base station based on the reference signal (RS) transmitted from the relay station. R→BS The base station may measure the terminal station UE i Based on the reference signal transmitted from the relay station, the path loss L UEi→BS The base station may report information about these measurements to the control device.

[0096] The relay station is the terminal station UE i Based on the reference signal transmitted from the terminal station UE i Path loss from the relay station to the UEi→R The relay station may report information about the measurement result to the control device, either via the base station or not.

[0097] When TDM is used, L BS→R =L R→BS And L BS→UEi =L UEi→BS And L R→UEi =L UEi→R In this case, the control device may assume that the L R→BS ,L UEi→BS, L UEi→R Based on the information on BS→R ,L BS→UEi, L R→UEi may be derived.

[0098] The control device controls the relay station / terminal station UE via the base station. i The RS configuration information may include information on the RB to be measured, the transmission timing of the RS (for example, a period, a time offset from a certain timing), and the like.

[0099] In addition, the terminal station UE i The RS configuration information notified to the terminal station UE may also be notified to the relay station. i The RS transmitted from can be properly received.

[0100] The control device is P TX R may be determined based on a report from the relay station (e.g., may be determined to be a reported value or a value indicated by the reported information). N R 、 NF TX R The control device may determine that each of P is a representative value (or a specific value). The representative value may be predetermined in the standard (for example, may be a required value in the standard). N R The terminal station UE i The decision may be based on reports of measurement results from the

[0101] In step S104, the control device i γ is the desired SINR of the received signal from the base station DESIRED UEi For example, the control device calculates i Based on the Modulation and Coding Scheme (MCS) used in communication with DESIRED UEi The control device may calculate information about the MCS from the base station. The information about the MCS may be transmitted to the terminal station UE using DCI for the PDSCH. i Alternatively, the MCS (or MCS index) may be specified in the

[0102] In step S105, the control device calculates γ RX, UEi and γ DESIRED UEi For example, the control device may determine whether to stop the non-regenerative relay of the relay station to the specific terminal station based on the stop condition (e.g., γ RX, UEi ≦γ DESIRED UEi +M0 UEi ) is satisfied, it may be decided to stop the non-regenerative relay of the relay station. UEi is the terminal station UE i The margin may be a margin (first margin) for a stop condition for the first margin, and may correspond to at least one of a positive value, 0, and a negative value. In the present disclosure, the margin may be read as an offset, a shift, and the like.

[0103] When it is determined that the non-regenerative relay of the relay station is to be stopped (step S105-Yes), in step S106, the control device i The relay station may notify the specific terminal station of the stop of non-regenerative repeating. In response to the notification of the stop of non-regenerative repeating, the relay station may stop the corresponding non-regenerative repeating.

[0104] In step S107, the control device determines the terminal station UE's i γ RX, UEi In addition, the control device calculates the terminal station UE i γ is the desired SINR of the received signal from the base station DESIRED UEi These calculations may be performed in the same manner as in step S104.

[0105] In step S108, the control device calculates γ RX, UEi and γ DESIRED UEi For example, the control device may determine whether to resume the non-regenerative relay of the relay station to the specific terminal station based on the resumption condition γ RX, UEi ≧γ DESIRED UEi +M1 UEi If M1 is satisfied, it may be determined that the relay station resumes non-regenerative relaying. UEi is the terminal station UE i It may be a margin (first margin) for the restart condition for M1, and may correspond to at least one of a positive value, 0, and a negative value. UEi is M0 UEi It may be larger, the same, or smaller.

[0106] M0 UEi , M1 UEi The priority / traffic volume of communication for the specific terminal station, the location of the specific terminal station, the terminal station UE i Priority of communication / traffic volume for the terminal station UE i For example, based on at least one of these, the position of M0 UEi and M1 UEi The magnitude relationship between the values ​​may be determined.

[0107] When it is determined that the non-regenerative relay of the relay station is to be resumed (step S108-Yes), the control device i The relay station may notify the restart of non-regenerative relay for the specific terminal station to the relay station 102. In response to the notification of the restart of non-regenerative relay, the relay station may restart the corresponding non-regenerative relay (return to step S103).

[0108] In addition, the relay station 30 may stop the non-regenerative relay when there is an instruction to stop the non-regenerative relay from the base station 20 / control device 10 separately from the above flow, or when a certain time has elapsed since the start of the non-regenerative relay or from a specific timing.

[0109] In the present disclosure, the stop condition may be referred to as a first condition, and the resume condition may be referred to as a second condition. Note that the stop condition / restart condition may be defined in advance in a standard, may be notified from another device (e.g., a base station, a node of an NF), or may be determined based on its own capabilities.

[0110] According to the first control flow described above, the control device can appropriately control the stop / restart of non-regenerative repeating in consideration of interference in a certain terminal station caused by non-regenerative repeating to another terminal station.

[0111] (Second control flow) 10 is a diagram showing an example of a second control flow according to an embodiment of the present disclosure. The second control flow differs from the first control flow in that the relay station itself determines whether to stop / resume non-regenerative relay. In the following, steps that may be the same as those in the first control flow will not be described repeatedly. For example, steps S201-S203 may be the same as steps S101-S103, respectively.

[0112] In step S204, the relay station i γ RX, UEi For example, γ RX UEi may be calculated based on the following Equation 3-6 above.RX UEi The acquisition of the information used to calculate is described below.

[0113] The control device is P TX BS , the derived L BS→R and L BS→UEi , the calculated γ DESIRED UEi , etc. may be notified to the relay station. It is not necessary to notify all of these pieces of information, and for example, some of the information may be stored in the relay station in advance.

[0114] The base station calculates the propagation loss L from the relay station to the base station based on the reference signal transmitted from the relay station. R→BS The base station may measure the terminal station UE i Based on the reference signal transmitted from the relay station, the path loss L UE→BS The base station may report information about these measurements to the control device.

[0115] In addition, γ RX R may be calculated based on Equation 6, or may be measured based on a notification signal / reference signal from the control device (base station).

[0116] The relay station is P N UEi 、 P N R 、 NF TX R The control device may determine that each of the above is a representative value (or a specific value). The representative value may be predetermined in the standard (for example, may be a required value in the standard). N R The terminal station UE i The decision may be based on reports of measurement results from the

[0117] The relay station is L R→UEi =L UEi→R Assuming that the measured L UEi→R From LR→UEi may be derived.

[0118] The relay station determines γ based on the value notified by the control device described above, the representative value, the value measured / derived by itself, etc. RX, UEi Calculate.

[0119] In step S205, the relay station uses the γ RX, UEi and γ DESIRED UEi For example, the relay station may determine whether to stop non-regenerative relay for the specific terminal station based on the stop condition γ RX, UEi ≦γ DESIRED UEi +M0 UEi If M0 is satisfied, it may be determined that the non-regenerative relay of the relay station is to be stopped. UEi may be notified from the control device, or may be stored in the relay station in advance.

[0120] If it is determined that the relay station should stop the non-regenerative relay (step S205-Yes), in step S206, the relay station stops the non-regenerative relay for the specific terminal station. i The control device may notify the terminal station UE of the stop of non-regenerative relay for the particular terminal station. Based on the notification of the stop of non-regenerative relay, the control device may update / control the allocation of frequency resources related to non-regenerative relay for the relay station. For example, the control device may allocate frequency resources to be used for non-regenerative relay for the relay station to the terminal station UE. i The relay station may then change the frequency resource to one that is expected to reduce interference with the specific terminal station, and return to step S102 to transmit an instruction to the relay station to perform non-regenerative relay using the changed frequency resource in communication with the specific terminal station.

[0121] In step S207, the relay station determines the terminal station UE i γ RX,UEi In addition, the relay station calculates the terminal station UE i γ is the desired SINR of the received signal from the base station DESIRED UEi These calculations may be performed in the same manner as in step S204.

[0122] In step S208, the relay station uses the γ RX, UEi and γ DESIRED UEi For example, the relay station may determine whether to resume the non-regenerative relay for the specific terminal station based on the resumption condition γ RX, UEi ≧γ DESIRED UEi +M1 UEi If M1 is satisfied, it may be determined to resume the non-regenerative relay. UEi may be notified from the control device, or may be stored in the relay station in advance.

[0123] If it is determined that the non-regenerative relay is to be resumed (step S208-Yes), the relay station may resume the non-regenerative relay (return to step S203). i The resumption of non-regenerative relay for the specific terminal station may be notified to the terminal station.

[0124] According to the second control flow described above, the relay station can appropriately control the stop / restart of non-regenerative relay in consideration of interference in another terminal station caused by non-regenerative relay to a certain terminal station.

[0125] (Third control flow) 11 is a diagram showing an example of a third control flow according to an embodiment of the present disclosure. The third control flow differs from the first and second control flows in that the stop / resume of non-regenerative relay is determined based on reception quality information from a terminal station. In the following, steps that may be the same as those in the first control flow will not be described repeatedly. For example, steps S301-S303 and S305-S306 may be the same as steps S101-S103 and S105-S106, respectively.

[0126] In addition, based on the second control flow, the control device-related processing in FIG. 11 may be replaced with relay station-related processing, and the relay station may be configured to determine whether to stop / resume non-regenerative relaying based on reception quality information from the terminal station.

[0127] In step S304, the control device i γ RX, UEi The terminal station UE i The calculation is based on the reception quality information reported by

[0128] For example, when the reception quality information is SS-SINR / CSI-SINR, the value reported as SS-SINR / CSI-SINR may be an integer value between 0 and 127. The base station may also specify the measured quality based on the SS-SINR measurement report mapping shown in FIG. 12 (same as Table 10.1.16.1-1 of 3GPP TS 38.133). For example, when SS-SINR=0 is reported, the base station may specify the measured quality based on the SS-SINR measurement report mapping shown in FIG. 12 (same as Table 10.1.16.1-1 of 3GPP TS 38.133). RX, UEi ) may be judged to be less than -23 dB.

[0129] In addition, γ RX, UEi For example, if SS-SINR=0 is reported, the base station may determine that the measured SINR (=γ RX, UEi )=-23dB.

[0130] Note that the numbers "127" and "-23" above may be replaced with other numbers.

[0131] The reception quality information may include at least one of received power (e.g., Reference Signal Received Power (RSRP)), reception quality (e.g., Reference Signal Received Quality (RSRQ), SINR, SNR), signal strength (e.g., Received Signal Strength Indicator (RSSI)), channel state information (Channel State Information Reference Signal (CSI)), link quality indicator (Link Quality Indicator (LQI)), etc.

[0132] In step S304, similarly to step S104, the control device i γ is the desired SINR of the received signal from the base station DESIRED UEi Calculate.

[0133] In step S307, the control device determines the terminal station UE's i γ RX, UEi,1 Calculate γ RX UEi,1 The terminal station UE i may be calculated based on at least one of the expected received signal power, the expected received interference power, and the expected noise power. For example, γ RX UEi,1 may be calculated based on Equation 7-8 below.

[0134]

number

[0135] Here, γ RXUEi,0 is the terminal station UE at a time when non-regenerative relay is not used (or non-regenerative relay is not being performed). i In step S307, the control device i γ RX, UEi,0 Similarly to step S304, the terminal station UE i It may be calculated based on the reception quality information reported by the RX UEi,0 and γ in Eq. RX UEi,0 The measurement timing may be the same or different. For example, γ in Equation 8 RX UEi,0 Immediately after (or at the beginning of) the non-regenerative relay is stopped in step S306, the terminal station UE i Alternatively, the γ in Equation 7 may be calculated based on the reception quality information reported by RX UEi,0 may be calculated based on reception quality information reported after the reception quality information described above for Equation 8. RX, UEi may be the value calculated in step S304. R→UEi The relay station's non-regenerative relay is the terminal station UE i is the expected received interference power (amount of interference)

[0136] Figure 13 shows I R→UEi FIG. 1 is a diagram illustrating an example of parameters for calculating i The (direct) received signal from the base station and the received signal of the signal that is non-regeneratively relayed from the relay station to the specific terminal station are shown in FIG. RX UEi,0 At the time of measurement, there is no received signal of the signal that is non-regeneratively repeated from the relay station to the specific terminal station. R→UEi It can be seen that it can be derived.

[0137] Figure 14 shows the RX UEi,1 FIG. 1 is a diagram illustrating an example of parameters for calculating iThe (direct) received signal from the base station and the received signal of the signal that is non-regeneratively relayed from the relay station to the specific terminal station are shown in Equation 7-8. RX UEi,1 It can be seen that it can be derived.

[0138] The control device also includes a terminal station UE i γ is the desired SINR of the received signal from the base station DESIRED UEi This calculation may be performed in the same manner as in step S304.

[0139] In step S308, the control device calculates γ RX, UEi,1 and γ DESIRED UEi For example, the control device may determine whether to resume the non-regenerative relay of the relay station to the specific terminal station based on the resumption condition γ RX, UEi,1 ≧γ DESIRED UEi +M1 UEi If this is satisfied, it may be determined to resume non-regenerative relaying of the relay station.

[0140] When it is determined that the non-regenerative relay of the relay station is to be resumed (step S308-Yes), the control device i The relay station may notify the restart of non-regenerative relay for the specific terminal station to the relay station 100. The relay station may restart the corresponding non-regenerative relay in response to the notification of the restart of non-regenerative relay (return to step S303).

[0141] According to the third control flow described above, the control device can appropriately control the stop / restart of non-regenerative repeating in consideration of interference in a terminal station caused by non-regenerative repeating to another terminal station.

[0142] (Variations in stop / resume decisions) The nth (n is an integer) judgment result regarding the stop / resume of non-regenerative relay at the relay station as shown in steps S105, S108, etc. is DUEi R If we let (n) ∈ {0, 1} (for example, 0 = stop, 1 = resume), then there are the following variations in decision making: (1) apply (use) the result of each time as is, (2) move average, (3) switch and stay, and (4) actually apply if the number of times the same decision is made in a certain period of time exceeds a threshold.

[0143] In the case of (1) above, D UEi R (n)=D UEi R (n).

[0144] In the case of (2) above, for example, the moving average window W MA (Window length = L w ) to obtain a moving average. In this case, D UEi R (n)=W MA (D UEi R (nL w +1:n), W MA (D UEi R (nL w +1:n) may be calculated using the following formula 9. UEi R (nL w +1:n) is D UEi R (nL w +1), …, D UEi R It may also mean (n).

[0145]

number

[0146] In addition, a i is a weight that may vary based on the time since the decision. For example, i The larger i is (the closer it is to n), the larger the value may be. In this case, more recent judgment results can be weighted. Note that "0.5" in Equation 9 may be another real number value.

[0147] In the case of (3) above, as shown in the following formula 10, ss The result of the decision D UEi R (nL ss :n-1) are all current judgment D UEi R If it is different from (n), the next decision D UEi R (n+1) is forced to the past L ss In other words, the nth decision temporarily switches between stopping and restarting non-playback broadcasting, but the n+1th decision returns it to the previous state.

[0148]

number

[0149] In the case of (4) above, if the same judgment result (a judgment that changes from the current state) occurs more than the threshold X times within the period T, the judgment result is actually treated as valid, and if not, the non-regenerative relay state is maintained.

[0150] Which of the above (1)-(4) will be used, and L w , "Other real values", such as Lss, T, and X, may be determined in advance, may be provided by another device, or may be determined based on the communication quality of the mobile station, etc.

[0151] (Control flow variations) In the above control flow, a case where there is one relay station and non-regenerative relay is transmitted to only one terminal station is illustrated, but the scope of application of the present disclosure is not limited to this. The above first, second and third control flows can be modified and applied to cases where there are multiple relay stations, where non-regenerative relay is transmitted from one relay station to multiple terminal stations, and so on.

[0152] For example, in the case where there are multiple relay stations, in step S101, IN,max UEi may be calculated using the following Equation 11 instead of Equation 2.

[0153]

number

[0154] Here, N R is the number of relay stations that are going to implement non-regenerative relay, P TX,max Rj is relay station R j The maximum transmission power at L SI Rj is relay station R j The propagation loss between the receiving antenna and the transmitting antenna, D UEi Rj is relay station R j The value is obtained from a specific spectral mask of the unregenerated repeating signal of P TX,max Rj , L SI Rj , D UEi Rj are the same as those explained in the first control flow, TX,max R , L SI R , D UEi may be obtained / identified similarly.

[0155] FIG. 15 shows the γ RX,min UEi FIG. 1 is a diagram showing an example of parameters for calculating P TX,max R1 =P TX,max R2 =P TX,max R From equations 1 and 11, γ RX,min UEi It can be seen that it can be derived.

[0156] Note that multiple relay stations may perform non-regenerative relay for the same terminal station. For example, multiple relay stations may use the same frequency to perform non-regenerative relay for the same terminal station.

[0157] In the case where there are multiple relay stations, the relay station in the steps after step S102 may be replaced with each of the multiple relay stations. For example, in steps S102 and S103, the control device instructs the multiple relay stations to perform non-regenerative relay, and the multiple relay stations perform non-regenerative relay.

[0158] If there are multiple relay stations, in steps S104 and S107, IN UEi may be calculated using the following Equations 12-14 instead of Equation 4-6.

[0159]

number

[0160] Here, P TX Rj is relay station R j Transmit power at, L Rj→UEi is relay station R j and the terminal station UE i The propagation loss between TX Rj is relay station R j from the terminal station UE i is the SINR of the transmitted signal to the RX Rj is relay station R j is the SINR of the received signal from the base station at TX Rj is relay station R j NF of L BS→Rj is the base station and relay station R j The propagation loss between N Rj is relay station R j is the noise power at

[0161] FIG. 16 shows the γ RX UEi 3, 12-14 are used to calculate γ RX UEi It can be seen that it can be derived.

[0162] In step S106, step S108-Yes, etc., the stop / restart of non-replay broadcasting is R It may be possible to target all relay stations, or N R Alternatively, only a specific relay station among the relay stations may be targeted. In the latter case, non-regenerative relay communication other than the specific relay station can be continued, and the communication quality of the terminal station receiving the non-regenerative relay communication can be ensured. For example, R Among the relay stations, the target of non-regenerative relay stop is determined based on the stop condition (e.g., γ RX, UEi ≦γ DESIRED UEi +M0 UEi ) is no longer satisfied, i The relay stations may be selected in descending order of interference to γ RX, UEi (excluding from

[0163] Furthermore, those skilled in the art will naturally understand that when non-regenerative relays are transmitted from one relay station to multiple terminal stations, a similar control flow can be realized by taking into account each transmission signal, etc., as in the case of multiple relay stations described above.

[0164] According to the variation of the control flow described above, the control device / relay station can appropriately control the stopping / resuming of non-regenerative relaying in consideration of interference in other terminal stations caused by non-regenerative relaying of a plurality of relay stations / terminal stations.

[0165] <Supplementary Information> In the present disclosure, the non-regenerative relay that is stopped / resume is assumed to be downlink communication, but is not limited to this, and only uplink communication may be stopped / resume, or both uplink communication and downlink communication may be stopped / resume.

[0166] In the present disclosure, the frequency resource of the signal transmitted from the base station 20 to the terminal station 40b and the frequency resource of the non-regenerative relay signal transmitted from the relay station 30 to the terminal station 40a may not overlap, or may overlap partially or completely.

[0167] In the present disclosure, the notification of the stop / resume of non-replay relay may be a notification of information that explicitly indicates the stop / resume of non-replay relay, or may be a notification of information / signal that implicitly indicates the stop / resume of non-replay relay.

[0168] In the present disclosure, the stop / resume of the non-regenerative relay in the above-mentioned control flow is controlled based on the SINR, but this is not limited to this. The SINR in the above-mentioned control flow may be replaced with any metric related to the received power / received quality / signal strength, CSI, LQI, etc., or a combination of these.

[0169] In the present disclosure, a measurement result (such as SINR) may correspond to a measurement result in a specific layer (e.g., Layer 1, Layer 3). For example, any measurement result may be interchangeably read as a measurement result labeled with Layer 1 (L1-), Layer 3 (L3-), etc.

[0170] In the present disclosure, the terms resource block (RB), subcarrier, resource element, subband, resource block group, physical RB (PRB), common RB (CRB), virtual RB (VRB), resource block set, frequency band, bandwidth, frequency bandwidth, frequency band, frequency range, frequency resource, frequency domain resource, etc. may be read interchangeably.

[0171] The formulas shown in this disclosure may be read as formulas in which a predetermined operation (e.g., addition, subtraction, multiplication, division) is applied between an arbitrary coefficient / variable / term and an arbitrary value. The formulas shown in this disclosure may be read as formulas in which an arbitrary coefficient / variable / term is deleted.

[0172] In the present disclosure, the measurement in the base station / relay station / terminal station may be performed based on at least one of a reference signal, a synchronization signal (SS), and a channel. In the present disclosure, even if the non-regenerative relay is stopped / ended, the measurement in the base station / relay station / terminal station may be performed (the reference signal / synchronization signal / channel for the measurement may also be transmitted).

[0173] As the reference signal, a Downlink Reference Signal (DL-RS), an Uplink Reference Signal (UL-RS), or the like may be used.

[0174] The uplink channel may be a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), or the like.

[0175] The downlink channel may be a Physical Downlink Shared Channel (PDSCH), a Physical Downlink Control Channel (PDCCH), a Physical Broadcast Channel (PBCH), or the like.

[0176] The DL-RS may be a Channel State Information Reference Signal (CSI-RS), a Demodulation Reference Signal (DMRS), a Positioning Reference Signal (PRS), a Phase Tracking Reference Signal (PTRS), a Cell-specific Reference Signal (CRS), etc.

[0177] In addition, CSI-RS may be interchangeably referred to as Non Zero Power (NZP) CSI-RS, NZP CSI-RS for interference measurement, CSI-Interference Measurement (IM), Zero Power (ZP) CSI-RS, etc.

[0178] The UL-RS may be a sounding reference signal (SRS), a demodulation reference signal (DMRS), a PRS, a PTRS, or the like.

[0179] Note that the DMRS may be called a user equipment specific reference signal (UE-specific reference signal), and a different DMRS may be used for each channel (for example, PUSCH DMRS, PUCCH DMRS, PDSCH DMRS, PDCCH DMRS, PBCH DMRS, etc. may be used).

[0180] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and the PBCH DMRS) may be called an SS / PBCH block, an SS Block (SSB), or the like. In addition, the SS, SSB, and the like may also be called a reference signal.

[0181] (Application of each embodiment) At least one of the above-described embodiments may be applied when a specific condition is satisfied, which may be specified in a standard or may be notified to any device using higher layer signaling / physical layer signaling.

[0182] Also, at least one of the above-described embodiments may be applied when any device is configured / activated / triggered to set / activate specific information related to the above-described embodiments (or to perform the operations of the above-described embodiments) by higher layer signaling / physical layer signaling. For example, the specific information may be information indicating that SINR-based non-regenerative relay stop / resume control is enabled, any RRC parameter for a specific release (e.g., Rel. 18 / 19), etc.

[0183] <Modification> In addition, terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings.

[0184] In the present disclosure, the terms apparatus, circuit, device, section, unit, etc. may be interpreted interchangeably.

[0185] The information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0186] The names used for parameters and the like in this disclosure are not limiting in any way. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure.

[0187] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0188] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added to. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0189] Any information described in the present disclosure (e.g., information related to any parameter / variable) may be communicated between any devices in the present disclosure. Furthermore, in the present disclosure, the communication of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods.

[0190] For example, notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), signaling of a specific interface (X2 interface, S1 interface, NG interface, etc.), other signals / channels (e.g., reference signals), or a combination of these.

[0191] The physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. The RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. The MAC signaling may be notified, for example, by using a MAC Control Element (CE).

[0192] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0193] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0194] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0195] In the present disclosure, terms such as "base station (BS)," "radio base station," "relay station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "Transmission Point (TP)," "Reception Point (RP)," "Transmission / Reception Point (TRP)," "panel," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably.

[0196] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0197] Any device in this disclosure may be an Internet of Things (IoT) device, such as a sensor.

[0198] Any device in the present disclosure may be called a transmitting device, a receiving device, a wireless communication device, etc. Any device in the present disclosure may be a device mounted on a moving object that is a movable object, the moving object itself, etc. The moving object includes, but is not limited to, for example, a vehicle, a transport vehicle, an automobile, a motorcycle, a bicycle, a connected car, an excavator, a bulldozer, a wheel loader, a dump truck, a forklift, a train, a bus, a handcart, a rickshaw, a ship and other watercraft, an airplane, a rocket, an artificial satellite, a drone, a multicopter, a quadcopter, a balloon, and objects mounted thereon. The moving object may also be autonomous / automatically driven.

[0199] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to implementation. In addition, the processing procedures, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be reordered unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0200] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0201] Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.

[0202] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. The coupling or connection between the elements may be via wired and / or wireless connections.

[0203] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0204] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Further, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0205] In this disclosure, where articles have been added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0206] In the present disclosure, words such as "decide," "judge," "determine," "select," "calculate," "calculate," "process," "derive," "search," "confirm," "assume," and "expect" may be interpreted interchangeably.

[0207] In the present disclosure, terms such as "less than", "less than", "greater than", "more than", "equal to", etc. may be read as interchangeable. In addition, in the present disclosure, terms meaning "good", "bad", "big", "small", "high", "low", "fast", "slow", "wide", "narrow", etc. may be read as interchangeable, not limited to positive, comparative, and superlative. In addition, in the present disclosure, terms meaning "good", "bad", "big", "small", "high", "low", "fast", "slow", "wide", "narrow", etc. may be read as interchangeable, not limited to positive, comparative, and superlative, as expressions with "ith" (i is any integer) (for example, "best" may be read as "ith best").

[0208] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be interpreted interchangeably.

[0209] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The description of the present disclosure is for the purpose of illustrative explanation and does not bring any limiting meaning to the invention according to the present disclosure.

[0210] <Additional Notes> With respect to one embodiment of the present disclosure, the following invention is noted. [Appendix 1] A control unit that identifies a second terminal station for which interference due to non-regenerative relay between the base station and the first terminal station via the relay station is a concern; and a communication unit that notifies the relay station of the stop of the non-regenerative relay when a first condition related to a received signal to interference plus noise ratio (SINR) of a signal received from the base station to the second terminal station is satisfied at the timing when the non-regenerative relay is performed. [Appendix 2] The control device according to claim 1, wherein the control unit identifies the second terminal station based on a worst-case value of the received SINR assumed at a timing when the non-regenerative relay is performed. [Appendix 3] The control device according to claim 2, wherein the control unit calculates the worst value of the received SINR based on a maximum value of an estimated interference noise power caused by the non-regenerative relay in the second terminal station. [Appendix 4] 4. The control device according to claim 1, wherein the first condition is based on the expected received SINR at the timing when the non-regenerative relay is performed, a desired SINR, and a first margin. [Appendix 5] The control device described in Appendix 4, wherein the communication unit notifies the relay station of the resumption of the non-regenerative relay when the non-regenerative relay is stopped and when a second condition related to the expected received SINR when the non-regenerative relay is performed is satisfied. [Appendix 6] The control device according to claim 5, wherein the second condition is based on the expected received SINR when the non-regenerative relay is performed, a desired SINR, and a second margin. [Appendix 7] 7. The control device according to claim 4, wherein the control unit calculates the received SINR based on an estimated interference plus noise power caused by the non-regenerative relay in the second terminal station. [Appendix 8] 2. The control device according to claim 1, wherein the first condition is based on the received SINR calculated based on reception quality information reported from the second terminal station, a desired SINR, and a first margin. [Appendix 9] A relay station, a communication unit that receives information about a second terminal station that is concerned about interference due to non-regenerative relay between the base station and the first terminal station via the relay station; a control unit that decides to stop the non-regenerative relay when a first condition related to a received signal to interference plus noise ratio (SINR) of a signal received by the second terminal station from the base station is satisfied at the timing when the non-regenerative relay is performed. [Appendix 10] The relay station according to claim 9, wherein the second terminal station is identified based on a worst-case value of the received SINR assumed at a timing when the non-regenerative relay is performed. [Appendix 11] 11. The relay station according to claim 10, wherein the worst value of the received SINR is calculated based on a maximum value of an estimated interference noise power caused by the non-regenerative relay in the second terminal station. [Appendix 12] 12. The relay station according to claim 9, wherein the first condition is based on the expected received SINR at the timing when the non-regenerative relay is performed, a desired SINR, and a first margin. [Appendix 13] The relay station according to claim 12, wherein the control unit decides to resume the non-regenerative relay when the non-regenerative relay is stopped and when a second condition related to the expected received SINR when the non-regenerative relay is performed is satisfied. [Appendix 14] The relay station according to claim 13, wherein the second condition is based on the expected received SINR when the non-regenerative relay is performed, a desired SINR, and a second margin. [Appendix 15] 15. The relay station according to claim 12, wherein the received SINR is calculated based on an estimated interference noise power caused by the non-regenerative relay at the second terminal station. [Appendix 16] A step of identifying a second terminal station which is concerned about interference due to non-regenerative relay between the base station and the first terminal station via a relay station; and notifying the relay station of the stop of the non-regenerative relay when a first condition related to a received signal to interference plus noise ratio (SINR) of a signal received from the base station to the second terminal station is satisfied at the timing when the non-regenerative relay is performed.

Claims

1. a control unit that identifies a second terminal station for which interference due to non-regenerative relay between the base station and the first terminal station via the relay station is a concern; a communication unit that notifies the relay station of the stop of the non-regenerative relay when a first condition related to a received signal to interference plus noise ratio (SINR) of a signal received from the base station to the second terminal station is satisfied at the timing when the non-regenerative relay is performed.

2. The control device according to claim 1 , wherein the control unit identifies the second terminal station based on a worst-case value of the received SINR assumed at a timing when the non-regenerative relay is performed.

3. The control device according to claim 2 , wherein the control unit calculates the worst value of the received SINR based on a maximum value of interference noise power expected to be caused by the non-regenerative relay in the second terminal station.

4. The control device according to claim 1 , wherein the first condition is based on the expected received SINR at the timing when the non-regenerative relay is performed, a desired SINR, and a first margin.

5. The control device according to claim 4, wherein the communication unit notifies the relay station of the resumption of the non-regenerative relay when the non-regenerative relay is stopped and when a second condition related to the expected received SINR when the non-regenerative relay is performed is satisfied.

6. The control device according to claim 5 , wherein the second condition is based on the received SINR assumed when the non-regenerative relay is performed, a desired SINR, and a second margin.

7. The control device according to claim 4 , wherein the control unit calculates the received SINR based on an estimated interference plus noise power caused by the non-regenerative relay in the second terminal station.

8. The control device according to claim 1 , wherein the first condition is based on the received SINR calculated based on reception quality information reported from the second terminal station, a desired SINR, and a first margin.

9. A relay station, a communication unit that receives information about a second terminal station that is concerned about interference due to non-regenerative relay between a base station and a first terminal station via the relay station; a control unit that decides to stop the non-regenerative relay when a first condition related to a received signal to interference plus noise ratio (SINR) of a signal received by the second terminal station from the base station is satisfied at the timing when the non-regenerative relay is performed.

10. The relay station according to claim 9 , wherein the second terminal station is specified based on a worst-case value of the received SINR assumed at a timing when the non-regenerative relay is performed.

11. The relay station according to claim 10 , wherein the worst value of the received SINR is calculated based on a maximum value of an estimated interference noise power caused by the non-regenerative relay in the second terminal station.

12. The relay station according to claim 9 , wherein the first condition is based on the expected received SINR at a timing when the non-regenerative relay is performed, a desired SINR, and a first margin.

13. The relay station according to claim 12, wherein the control unit decides to resume the non-regenerative relay when the non-regenerative relay is stopped and when a second condition related to the expected received SINR when the non-regenerative relay is performed is satisfied.

14. The relay station according to claim 13 , wherein the second condition is based on the received SINR assumed when the non-regenerative relay is performed, a desired SINR, and a second margin.

15. The relay station according to claim 12 , wherein the received SINR is calculated based on an estimated interference-to-noise power caused by the non-regenerative relay in the second terminal station.

16. A step of identifying a second terminal station for which interference due to non-regenerative relay between the base station and the first terminal station via a relay station is a concern; and when a first condition related to a received signal to interference plus noise ratio (SINR) of a signal received by the second terminal station from the base station is satisfied at a timing when the non-regenerative relay is performed, notifying the relay station of the stop of the non-regenerative relay.

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