Device and method for performing coordinated communication on basis of rate splitting in wireless communication system

Abstract

The purpose of the present disclosure is to perform coordinated communication on the basis of rate splitting in a wireless communication system, and a method performed by a first terminal in a wireless communication system may comprise the steps of: acquiring system information; performing an initial access procedure with a first base station on the basis of the system information; receiving configuration information on channel measurement; performing a channel measurement procedure on the basis of the configuration information on the channel measurement; receiving a first data signal from the first base station; and receiving a second data signal from a second base station.

Description

Device and method for performing cooperative communication based on rate division in a wireless communication system

[0001] The present disclosure relates to a wireless communication system, and to a device and method for performing cooperative communication based on rate-splitting in a wireless communication system.

[0002] Wireless access systems are widely deployed to provide various types of communication services, such as voice and data. Typically, wireless access systems are multiple access systems that support communications with multiple users by sharing available system resources (e.g., bandwidth, transmission power). Examples of multiple access systems include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single-carrier frequency division multiple access (SC-FDMA).

[0003] In particular, as numerous communication devices demand greater communication capacity, enhanced mobile broadband (eMBB) communication technologies are being proposed, improving upon existing radio access technology (RAT). Furthermore, massive machine type communications (mMTC), which connects multiple devices and objects to provide diverse services anytime and anywhere, as well as communication systems that consider reliability and latency-sensitive services / user equipment (UE), are being proposed. Various technological configurations are being proposed for these solutions.

[0004] The present disclosure relates to a device and method for performing cooperative communication based on rate division in a wireless communication system.

[0005] The present disclosure relates to a device and method for utilizing a reconfigurable intelligent surface (RIS) in a wireless communication system.

[0006] The present disclosure relates to a device and method for utilizing a rate-splitting multiple access (RSMA) technique in a wireless communication system.

[0007] The present disclosure relates to a device and method for improving the SINR (signal to interference plus noise ratio) of terminals included in a serving cell in a wireless communication system.

[0008] The present disclosure relates to a device and method for determining a terminal to perform cooperative communication in a wireless communication system.

[0009] The present disclosure relates to a device and method for transmitting a common message and a private message through different base stations in a wireless communication system.

[0010] The present disclosure relates to a device and method for transmitting a common message including metadata of a private message in a wireless communication system.

[0011] The present disclosure relates to a device and method for measuring an RIS channel in a wireless communication system.

[0012] The present disclosure relates to a device and method for determining a measurement resource based on a measurement gap to measure an RIS channel in a wireless communication system.

[0013] The present disclosure relates to a device and method for sharing a list of cooperative cells in a wireless communication system.

[0014] The present disclosure relates to a device and method for determining a cooperative cell based on a cooperative cell list in a wireless communication system.

[0015] The technical objectives to be achieved in the present disclosure are not limited to those mentioned above, and other technical tasks not mentioned can be considered by a person having ordinary skill in the technical field to which the technical configuration of the present disclosure is applied from the embodiments of the present disclosure described below.

[0016] As an example of the present disclosure, a method performed by a first terminal in a wireless communication system includes the steps of: acquiring system information; performing an initial connection procedure with a first base station based on the system information; receiving configuration information regarding channel measurement; performing a channel measurement procedure based on the configuration information regarding channel measurement; receiving a first data signal from the first base station; and receiving a second data signal from a second base station, wherein the first data signal includes a first common message decoded by terminals connected to the first base station and a second private message decoded by a second terminal connected to the first base station, and the second data signal may include a second common message received through a reconfigurable intelligent surface (RIS) and decoded by terminals connected to the second base station, a first private message decoded by the first terminal, and a third private message decoded by a third terminal connected to the second base station.

[0017] As an example of the present disclosure, a method performed by a first base station in a wireless communication system includes the steps of transmitting system information, performing an initial connection procedure with a first terminal, performing a channel measurement procedure, determining setting information regarding cooperative communication, transmitting a first private message decoded by the first terminal to a second base station, and transmitting a first data signal to the first terminal, wherein the first data signal includes a first common message decoded by terminals connected to the first base station and a second private message decoded by a second terminal connected to the first base station, and wherein the first private message is included in the second data signal together with the second common message decoded by terminals connected to the second base station and the third private message decoded by a third terminal connected to the second base station, and can be transmitted by the second base station to the terminal via a reconfigurable intelligent surface (RIS).

[0018] As an example of the present disclosure, a method performed by a network node in a wireless communication system includes the steps of receiving a reset request signal from a first base station, performing a channel measurement procedure, determining setting information regarding cooperative communication based on the channel measurement procedure, transmitting a first message to the first base station, and transmitting a second message to a second base station, wherein the first message includes a first common message decoded by terminals connected to the first base station and a second private message decoded by a second terminal connected to the first base station, and the second message may include a second common message decoded by terminals connected to the second base station, a first private message decoded by the first terminal connected to the first base station, and a third private message decoded by a third terminal connected to the second base station.

[0019] As an example of the present disclosure, in a wireless communication system, a first terminal includes a transceiver and a processor connected to the transceiver, wherein the processor is configured to obtain system information, perform an initial connection procedure with a first base station based on the system information, receive configuration information regarding channel measurement, perform a channel measurement procedure based on the configuration information regarding channel measurement, receive a first data signal from the first base station, and receive a second data signal from a second base station, wherein the first data signal includes a first common message decoded by terminals connected to the first base station and a second private message decoded by a second terminal connected to the first base station, and the second data signal may include a second common message received through a reconfigurable intelligent surface (RIS) and decoded by terminals connected to the second base station, a first private message decoded by the first terminal, and a third private message decoded by a third terminal connected to the second base station.

[0020] As an example of the present disclosure, in a wireless communication system, a first base station includes a transceiver and a processor connected to the transceiver, wherein the processor is configured to transmit system information, perform an initial connection procedure with a first terminal, perform a channel measurement procedure, determine setup information regarding cooperative communication, transmit a first private message decoded by the first terminal to a second base station, and transmit a first data signal to the first terminal, wherein the first data signal includes a first common message decoded by terminals connected to the first base station and a second private message decoded by a second terminal connected to the first base station, and the first private message is included in the second data signal together with the second common message decoded by terminals connected to the second base station and the third private message decoded by a third terminal connected to the second base station, and can be transmitted by the second base station to the terminal via a reconfigurable intelligent surface (RIS).

[0021] As an example of the present disclosure, in a wireless communication system, a network node includes a transceiver, and a processor connected to the transceiver, wherein the processor is configured to receive a reset request signal from a first base station, perform a channel measurement procedure, determine setting information regarding cooperative communication based on the channel measurement procedure, transmit a first message to the first base station, and transmit a second message to a second base station, wherein the first message includes a first common message decoded by terminals connected to the first base station and a second private message decoded by a second terminal connected to the first base station, and the second message may include a second common message decoded by terminals connected to the second base station, a first private message decoded by the first terminal connected to the first base station, and a third private message decoded by a third terminal connected to the second base station.

[0022] As an example of the present disclosure, a communication device includes at least one processor, and at least one computer memory connected to the at least one processor and storing instructions that direct operations when executed by the at least one processor, the operations including: obtaining system information; performing an initial connection procedure with a first base station based on the system information; receiving configuration information regarding channel measurement; performing a channel measurement procedure based on the configuration information regarding channel measurement; receiving a first data signal from the first base station; and receiving a second data signal from a second base station, wherein the first data signal includes a first common message decoded by terminals connected to the first base station and a second private message decoded by a second terminal connected to the first base station, and wherein the second data signal includes a second common message received through a reconfigurable intelligent surface (RIS) and decoded by terminals connected to the second base station, a first private message decoded by the communication device, and a third private message decoded by a third terminal connected to the second base station. It may contain messages.

[0023] As an example of the present disclosure, a non-transitory computer-readable medium storing at least one instruction includes at least one instruction executable by a processor, wherein the at least one instruction configures a device to acquire system information, perform an initial connection procedure with a first base station based on the system information, receive configuration information regarding channel measurement, perform a channel measurement procedure based on the configuration information regarding channel measurement, receive a first data signal from the first base station, and receive a second data signal from a second base station, wherein the first data signal includes a first common message decoded by terminals connected to the first base station and a second private message decoded by a second terminal connected to the first base station, and wherein the second data signal includes a second common message received through a reconfigurable intelligent surface (RIS) and decoded by terminals connected to the second base station, the first private message decoded by the device, and the second base station and It may include a third personal message that is decoded by a connected third terminal.

[0024] The above-described aspects of the present disclosure are only some of the preferred embodiments of the present disclosure, and various embodiments reflecting the technical features of the present disclosure can be derived and understood by a person having ordinary skill in the art based on the detailed description of the present disclosure to be described below.

[0025] The following effects may be achieved by embodiments based on the present disclosure.

[0026] According to the present disclosure, a system can efficiently perform data communication with multiple cells based on rate-splitting.

[0027] The effects that can be obtained from the embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by those skilled in the art to which the technical configuration of the present disclosure is applied, from the description of the embodiments of the present disclosure below. In other words, unintended effects resulting from implementing the configuration described in the present disclosure can also be derived from the embodiments of the present disclosure by those skilled in the art.

[0028] The accompanying drawings are intended to aid understanding of the present disclosure and, together with detailed descriptions, may provide embodiments of the present disclosure. However, the technical features of the present disclosure are not limited to specific drawings, and the features disclosed in each drawing may be combined with each other to form new embodiments. Reference numerals in each drawing may indicate structural elements.

[0029] Figure 1 illustrates an example of a communication system applicable to the present disclosure.

[0030] FIG. 2 illustrates an example of a wireless device applicable to the present disclosure.

[0031] FIG. 3 illustrates a method for processing a transmission signal applicable to the present disclosure.

[0032] FIG. 4 illustrates an example of a communication structure that can be provided in a 6G (6th generation) system applicable to the present disclosure.

[0033] Figure 4 illustrates a communication procedure between a terminal and a base station applicable to the present disclosure.

[0034] FIG. 5 illustrates an example of a communication structure that can be provided in a 6G (6th generation) system applicable to the present disclosure.

[0035] Figure 6 illustrates an electromagnetic spectrum applicable to the present disclosure.

[0036] Figure 7 illustrates a THz communication method applicable to the present disclosure.

[0037] Figure 8 illustrates a THz signal generation method applicable to the present disclosure.

[0038] FIG. 9 illustrates a wireless communication transceiver applicable to the present disclosure.

[0039] Figure 10 illustrates a transmitter structure applicable to the present disclosure.

[0040] Figure 11 illustrates a system information transmission procedure applicable to the present disclosure.

[0041] Figure 12 illustrates a beam management procedure applicable to the present disclosure.

[0042] FIG. 13 illustrates an example of a wireless channel environment according to one embodiment of the present disclosure.

[0043] FIG. 14 illustrates an example of an intelligent wireless environment according to one embodiment of the present disclosure.

[0044] FIG. 15a and FIG. 15b illustrate examples of a conventional wireless channel environment and an intelligent wireless channel environment according to one embodiment of the present disclosure.

[0045] FIG. 16 illustrates an example of rate-splitting multiple access (RSMA) based transmission according to one embodiment of the present disclosure.

[0046] FIG. 17 illustrates an example of the structure of a transmitter and receiver supporting 1-layer RSMA according to one embodiment of the present disclosure.

[0047] Figure 18 illustrates an example of classification of cooperative communication according to the present embodiment.

[0048] FIG. 19 illustrates an example of a structure of a generalized coordinated multi-point (GCoMP) according to one embodiment of the present disclosure.

[0049] FIG. 20 illustrates an example of the architecture of a transmitter and receiver of RS-CMD (rate-splitting and common message decoding) according to one embodiment of the present disclosure.

[0050] FIG. 21 illustrates an example of a CoMP JT (joint transmission) model in an environment with three users according to one embodiment of the present disclosure.

[0051] FIG. 22 illustrates an example of a wireless communication environment performing cooperative communication according to one embodiment of the present disclosure.

[0052] FIG. 23 illustrates an example of a procedure for a terminal to receive data based on cooperative communication according to one embodiment of the present disclosure.

[0053] FIG. 24 illustrates an example of a procedure in which a first base station transmits a data signal based on cooperative communication according to one embodiment of the present disclosure.

[0054] FIG. 25 illustrates an example of a procedure in which a network node transmits a data signal based on cooperative communication according to one embodiment of the present disclosure.

[0055] FIG. 26 illustrates an example of a procedure for a control device to determine setting information regarding cooperative communication according to one embodiment of the present disclosure.

[0056] FIG. 27 illustrates an example of a procedure in which a control device performs measurement according to one embodiment of the present disclosure.

[0057] FIG. 28 illustrates an example of resource allocation for measuring a RIS channel according to one embodiment of the present disclosure.

[0058] FIG. 29 illustrates examples of messages used for cooperative communication according to one embodiment of the present disclosure.

[0059] FIG. 30 illustrates an example of signaling for performing cooperative communication controlled by a central processor according to one embodiment of the present disclosure.

[0060] FIG. 31 illustrates an example of signaling for performing cooperative communication controlled by a first base station according to one embodiment of the present disclosure.

[0061] FIG. 32 illustrates an example of signaling for determining whether to perform cooperative communication between base stations according to one embodiment of the present disclosure.

[0062] FIG. 33 illustrates an example of a procedure for a terminal to check a personal message according to one embodiment of the present disclosure.

[0063] FIG. 34 illustrates an example of a procedure for a terminal to decode a personal message according to one embodiment of the present disclosure.

[0064] FIG. 35 illustrates an example of an RSMA message structure according to one embodiment of the present disclosure.

[0065] Figure 36 illustrates an example of a wireless device applicable to the present disclosure.

[0066] Figure 37 illustrates an example of a portable device applicable to the present disclosure.

[0067] Figure 38 illustrates an example of a vehicle or autonomous vehicle applicable to the present disclosure.

[0068] Figure 39 illustrates an example of a vehicle applicable to the present disclosure.

[0069] Figure 40 illustrates an example of an XR device applicable to the present disclosure.

[0070] Figure 41 illustrates an example of a robot applicable to the present disclosure.

[0071] Figure 42 illustrates an example of an AI device applicable to the present disclosure.

[0072] The following embodiments combine the components and features of the present disclosure in a predetermined form. Each component or feature may be considered optional unless explicitly stated otherwise. Each component or feature may be implemented without being combined with other components or features. Furthermore, some components and / or features may be combined to form embodiments of the present disclosure. The order of operations described in the embodiments of the present disclosure may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment.

[0073] In the description of the drawings, procedures or steps that may obscure the gist of the present disclosure are not described, and procedures or steps that can be understood by a person skilled in the art are also not described.

[0074] Throughout the specification, when a part is said to "comprising" or "including" a component, this does not mean that other components may be included, but rather that other components may be excluded, unless otherwise specifically stated. In addition, terms such as "...part," "...unit," and "module" described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware, software, or a combination of hardware and software. In addition, the words "a" or "an," "one," "the," and similar related words may be used in the context of describing the present disclosure (especially in the context of the claims below) to include both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context.

[0075] Embodiments of the present disclosure described herein focus on the data transmission and reception relationship between a base station and a mobile station. Here, the base station is understood as a terminal node of a network that directly communicates with the mobile station. Certain operations described herein as being performed by the base station may, in some cases, be performed by an upper node of the base station.

[0076] That is, in a network consisting of multiple network nodes including a base station, various operations performed for communication with a mobile station may be performed by the base station or other network nodes other than the base station. In this case, the term 'base station' may be replaced by terms such as fixed station, Node B, eNB (eNode B), gNB (gNode B), ng-eNB, advanced base station (ABS), or access point.

[0077] Additionally, in the embodiments of the present disclosure, the term terminal may be replaced with terms such as user equipment (UE), mobile station (MS), subscriber station (SS), mobile subscriber station (MSS), mobile terminal, or advanced mobile station (AMS).

[0078] Additionally, a transmitter refers to a fixed and / or mobile node that provides data or voice services, and a receiver refers to a fixed and / or mobile node that receives data or voice services. Therefore, for uplink, a mobile station can be the transmitter, and a base station can be the receiver. Similarly, for downlink, a mobile station can be the receiver, and a base station can be the transmitter.

[0079] Embodiments of the present disclosure may be supported by standard documents disclosed in at least one of wireless access systems, such as IEEE 802.xx system, 3rd Generation Partnership Project (3GPP) system, 3GPP Long Term Evolution (LTE) system, 3GPP 5th generation (5G) NR (New Radio) system and 3GPP2 system, and in particular, embodiments of the present disclosure may be supported by 3GPP TS (technical specification) 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.321 and 3GPP TS 38.331 documents.

[0080] Furthermore, the embodiments of the present disclosure can be applied to other wireless access systems and are not limited to the systems described above. For example, they can be applied to systems implemented after the 3GPP 5G NR system and are not limited to a specific system.

[0081] That is, obvious steps or parts not described in the embodiments of the present disclosure can be explained by referring to the above documents. In addition, all terms disclosed in this document can be explained by the above standard documents.

[0082] Hereinafter, preferred embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description set forth below, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the present disclosure and is not intended to represent the only embodiments in which the technical configurations of the present disclosure may be implemented.

[0083] Additionally, specific terms used in the embodiments of the present disclosure are provided to aid in understanding of the present disclosure, and the use of such specific terms may be changed to other forms without departing from the technical spirit of the present disclosure.

[0084] The following technology can be applied to various wireless access systems such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), and SC-FDMA (single carrier frequency division multiple access).

[0085]

[0086] For clarity, the following description is based on 3GPP communication systems (e.g., LTE, NR, etc.), but the technical spirit of the present disclosure is not limited thereto. LTE may refer to technology after 3GPP TS 36.xxx Release 8. Specifically, LTE technology after 3GPP TS 36.xxx Release 10 may be referred to as LTE-A, and LTE technology after 3GPP TS 36.xxx Release 13 may be referred to as LTE-A pro. 3GPP NR may refer to technology after TS 38.xxx Release 15. 3GPP 6G may refer to technology after TS Release 17 and / or Release 18. "xxx" refers to a standard document detail number. LTE / NR / 6G may be collectively referred to as a 3GPP system.

[0087] For background information, terms, abbreviations, etc. used in this disclosure, reference may be made to standard documents published prior to this disclosure. For example, reference may be made to standard documents 36.xxx and 38.xxx.

[0088]

[0089] Communication system applicable to the present disclosure

[0090] Although not limited thereto, the various descriptions, functions, procedures, proposals, methods and / or operational flowcharts of the present disclosure disclosed in this document may be applied to various fields requiring wireless communication / connectivity (e.g., 5G) between devices.

[0091] Hereinafter, more specific examples will be provided with reference to the drawings. In the drawings / descriptions below, the same drawing reference numerals may represent identical or corresponding hardware blocks, software blocks, or functional blocks, unless otherwise described.

[0092] Figure 1 illustrates an example of a communication system applied to the present disclosure.

[0093] Referring to FIG. 1, a communication system (100) applied to the present disclosure includes a wireless device, a base station, and a network. Here, the wireless device refers to a device that performs communication using a wireless access technology (e.g., LTE, LTE-A, LTE-A pro, NR, 5G, 5G-A, 6G) and may be referred to as a communication / wireless / 5G device. Although not limited thereto, the wireless device may include a robot (100a), a vehicle (100b-1, 100b-2), an XR (extended reality) device (100c), a hand-held device (100d), a home appliance (100e), an IoT (Internet of Things) device (100f), and an AI (artificial intelligence) device / server (100g). For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, a vehicle capable of performing vehicle-to-vehicle communication, etc. Here, the vehicles (100b-1, 100b-2) may include unmanned aerial vehicles (UAVs) (e.g., drones). The XR devices (100c) include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices, and may be implemented in the form of head-mounted devices (HMDs), head-up displays (HUDs) installed in vehicles, televisions, smartphones, computers, wearable devices, home appliances, digital signage, vehicles, robots, etc. The portable devices (100d) may include smartphones, smart pads, wearable devices (e.g., smartwatches, smart glasses), computers (e.g., laptops, etc.), etc. The home appliances (100e) may include TVs, refrigerators, washing machines, etc. The IoT devices (100f) may include sensors, smart meters, etc.For example, the base station (120) and the network (130) may also be implemented as wireless devices, and a specific wireless device (120a) may act as a base station / network node to other wireless devices.

[0094] Wireless devices (100a to 100f) can be connected to a network (130) via a base station (120). AI technology can be applied to the wireless devices (100a to 100f), and the wireless devices (100a to 100f) can be connected to an AI server (100g) via a network (130). The network (130) can be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR), or a 6G network. The wireless devices (100a to 100f) can communicate with each other via the base station (120) / network (130), but can also communicate directly (e.g., sidelink communication) without going through the base station (120) / network (130). For example, vehicles (100b-1, 100b-2) can communicate directly (e.g., V2V (vehicle to vehicle) / V2X (vehicle to everything) communication). Additionally, an IoT device (100f) (e.g., a sensor) can communicate directly with another IoT device (e.g., a sensor) or another wireless device (100a to 100f).

[0095] Wireless communication / connection (150a, 150b, 150c) can be established between wireless devices (100a to 100f) / base stations (120), and base stations (120) / base stations (120). Here, the wireless communication / connection can be established through various wireless access technologies such as uplink / downlink communication (150a), sidelink communication (150b) (or D2D communication), and base station-to-base station communication (150c) (e.g., relay, IAB (integrated access backhaul)). Through the wireless communication / connection (150a, 150b, 150c), the wireless device and base station / wireless device, and base stations and base stations can transmit / receive wireless signals to / from each other. For example, the wireless communication / connection (150a, 150b, 150c) can transmit / receive signals through various physical channels. To this end, based on various proposals of the present disclosure, at least some of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), resource allocation processes, etc. may be performed.

[0096]

[0097] Devices applicable to the present disclosure

[0098] FIG. 2 illustrates an example of a wireless device applicable to the present disclosure.

[0099] Referring to FIG. 2, the wireless device (200) can transmit and receive wireless signals via various wireless access technologies (e.g., LTE, LTE-A, LTE-A pro, NR, 5G, 5G-A, 6G). The wireless device (200) includes at least one processor (202) and at least one memory (204), and may additionally include at least one transceiver (206) and / or at least one antenna (208).

[0100] The processor (202) controls the memory (204) and / or the transceiver (206), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (202) may process information in the memory (204) to generate first information / signal, and then transmit a wireless signal including the first information / signal via the transceiver (206). In addition, the processor (202) may receive a wireless signal including second information / signal via the transceiver (206), and then store information obtained from signal processing of the second information / signal in the memory (204). The memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, the memory (204) may store software code including instructions for performing some or all of the processes controlled by the processor (202), or for performing the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein. Here, the processor (202) and the memory (204) may be part of a communication modem / circuit / chip designed to implement wireless communication technology. The transceiver (206) may be connected to the processor (202) and may transmit and / or receive wireless signals via at least one antenna (208). The transceiver (206) may include a transmitter and / or a receiver. The transceiver (206) may be used interchangeably with an RF (radio frequency) unit. In the present disclosure, a wireless device may also mean a communication modem / circuit / chip.

[0101] Hereinafter, the hardware elements of the wireless device (200) will be described in more detail. Although not limited thereto, at least one protocol layer may be implemented by at least one processor (202). For example, at least one processor (202) may implement at least one layer (e.g., a functional layer such as physical (PHY), media access control (MAC), radio link control (RLC), packet data convergence protocol (PDCP), radio resource control (RRC), and service data adaptation protocol (SDAP)). At least one processor (202) may generate at least one Protocol Data Unit (PDU) and / or at least one Service Data Unit (SDU) according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. At least one processor (202) may generate a message, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. At least one processor (202) can generate a signal (e.g., a baseband signal) including a PDU, an SDU, a message, control information, data or information according to the functions, procedures, proposals and / or methods disclosed in this document, and provide the signal to at least one transceiver (206). At least one processor (202) can receive a signal (e.g., a baseband signal) from at least one transceiver (206) and obtain the PDU, SDU, message, control information, data or information according to the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed in this document.

[0102] At least one processor (202) may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. The at least one processor (202) may be implemented by hardware, firmware, software, or a combination thereof. For example, at least one application specific integrated circuit (ASIC), at least one digital signal processor (DSP), at least one digital signal processing device (DSPD), at least one programmable logic device (PLD), or at least one field programmable gate array (FPGA) may be included in the at least one processor (202). The descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. The descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document may be included in the at least one processor (202), or may be stored in at least one memory (204) and driven by the at least one processor (202). The descriptions, functions, procedures, suggestions, methods and / or flowcharts disclosed in this document may be implemented using firmware or software in the form of code, instructions and / or sets of instructions.

[0103] At least one memory (204) can be connected to at least one processor (202) and can store various forms of data, signals, messages, information, programs, codes, instructions and / or commands. The at least one memory (204) can be configured as a read only memory (ROM), a random access memory (RAM), an erasable programmable read only memory (EPROM), a flash memory, a hard drive, a register, a cache memory, a computer readable storage medium and / or a combination thereof. The at least one memory (204) can be located internally and / or externally to the at least one processor (202). In addition, the at least one memory (204) can be connected to the at least one processor (202) via various technologies such as a wired or wireless connection.

[0104] At least one transceiver (206) can transmit user data, control information, wireless signals / channels, etc., mentioned in the methods and / or flowcharts of this document to at least one other device. At least one transceiver (206) can receive user data, control information, wireless signals / channels, etc. mentioned in the descriptions, functions, procedures, proposals, methods and / or flowcharts disclosed in this document from at least one other device. For example, at least one transceiver (206) can be connected to at least one processor (202) and can transmit and receive wireless signals. For example, at least one processor (202) can control at least one transceiver (206) to transmit user data, control information, or wireless signals to at least one other device. Furthermore, at least one processor (202) can control at least one transceiver (206) to receive user data, control information, or wireless signals from at least one other device. In addition, at least one transceiver (206) may be connected to at least one antenna (208), and at least one transceiver (206) may be configured to transmit and receive user data, control information, wireless signals / channels, etc. mentioned in the descriptions, functions, procedures, proposals, methods and / or operation flowcharts disclosed in this document through at least one antenna (208). In this document, at least one antenna may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports). At least one transceiver (206) may convert the received wireless signals / channels, etc. from RF band signals to baseband signals in order to process the received user data, control information, wireless signals / channels, etc. using at least one processor (202). At least one transceiver (206) may convert the processed user data, control information, wireless signals / channels, etc. from baseband signals to RF band signals using at least one processor (202).For this purpose, at least one transceiver (206) may include an (analog) oscillator and / or filter.

[0105] The components of the wireless device described with reference to FIG. 2 may be referred to by different terms in terms of functionality. For example, the processor (202) may be referred to as a control unit, the transceiver (206) as a communication unit, and the memory (204) as a storage unit. In some cases, the communication unit may be used to mean at least a portion of the processor (202) and the transceiver (206).

[0106] The structure of the wireless device described with reference to FIG. 2 can be understood as the structure of at least a portion of various devices. For example, the structure of the wireless device illustrated in FIG. 2 can be at least a portion of various devices described with reference to FIG. 1 (e.g., a robot (100a), a vehicle (100b-1, 100b-2), an XR device (100c), a portable device (100d), a home appliance (100e), an IoT device (100f), an AI device / server (100g)). Furthermore, according to various embodiments, in addition to the components illustrated in FIG. 2, the device may further include other components.

[0107] For example, the device may be a portable device such as a smartphone, a smart pad, a wearable device (e.g., a smart watch, smart glasses), or a portable computer (e.g., a laptop, etc.). In this case, the device may further include at least one of a power supply unit that supplies power and includes a wired / wireless charging circuit, a battery, etc., an interface unit that includes at least one port for connection with another device (e.g., an audio input / output port, a video input / output port), and an input / output unit for inputting and outputting image information / signals, audio information / signals, data, and / or information input from a user.

[0108] For example, the device may be a mobile device such as a mobile robot, a vehicle, a train, an aerial vehicle (AV), a ship, etc. In this case, the device may further include at least one of a driving unit including at least one of an engine, a motor, a power train, wheels, brakes, and a steering unit of the device, a power supply unit including a wired / wireless charging circuit, a battery, etc. that supplies power, a sensor unit that senses status information, environmental information, and user information of the device or its surroundings, an autonomous driving unit that performs functions such as path maintenance, speed control, and destination setting, and a position measurement unit that obtains location information of the mobile device through a global positioning system (GPS) and various sensors.

[0109] For example, the device may be an XR device such as an HMD, a head-up display (HUD) installed in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, etc. In this case, the device may further include at least one of a power supply unit that supplies power and includes a wired / wireless charging circuit, a battery, etc., an input / output unit that obtains control information, data, etc. from the outside and outputs the generated XR object, and a sensor unit that senses status information, environmental information, and user information of the device or the surroundings of the device.

[0110] For example, the device may be a robot that can be classified into industrial, medical, household, military, etc. types depending on the purpose or field of use. In this case, the device may further include at least one of a sensor unit that senses status information, environmental information, and user information of the device or its surroundings, and a driving unit that performs various physical actions, such as moving the robot joints.

[0111] For example, the device may be an AI device such as a TV, a projector, a smartphone, a PC, a laptop, a digital broadcasting terminal, a tablet PC, a wearable device, a set-top box (STB), a radio, a washing machine, a refrigerator, digital signage, a robot, a vehicle, etc. In this case, the device may further include at least one of an input unit that acquires various types of data from the outside, an output unit that generates output related to sight, hearing, or touch, a sensor unit that senses status information, environmental information, and user information of the device or its surroundings, and a training unit that trains a model composed of an artificial neural network using learning data.

[0112] The structure of the wireless device illustrated in FIG. 2 may be understood as a part of a RAN node (e.g., base station, DU, RU, RRㅗ, etc.). That is, the device illustrated in FIG. 2 may be a RAN node. In this case, the device may further include a wired transceiver for front haul and / or back haul communication. However, if the front haul and / or back haul communication is based on wireless communication, at least one transceiver (206) illustrated in FIG. 2 may be used for front haul and / or back haul communication, and a wired transceiver may not be included.

[0113]

[0114] FIG. 3 illustrates a method for processing a transmission signal applicable to the present disclosure. For example, the transmission signal may be processed by a signal processing circuit. At this time, the signal processing circuit (300) may include a scrambler (310), a modulator (320), a layer mapper (330), a precoder (340), a resource mapper (350), and a signal generator (360). At this time, as an example, the operations / functions of FIG. 3 may be performed in the processor (202) and / or the transceiver (206) of FIG. 2. Furthermore, as an example, the hardware elements of FIG. 3 may be implemented in the processor (202) and / or the transceiver (206) of FIG. 2. As an example, blocks 310 to 360 may be implemented in the processor (202) of FIG. 2. Additionally, blocks 310 to 350 may be implemented in the processor (202) of FIG. 2, and block 360 may be implemented in the transceiver (206) of FIG. 2, and are not limited to the above-described embodiment.

[0115] The codeword can be converted into a wireless signal through the signal processing circuit (300) of FIG. 3. Here, the codeword is an encoded bit sequence of an information block. The information block may include a transport block (e.g., a UL-SCH transport block, a DL-SCH transport block). Here, the information block may include data related to AI (e.g., training data, AI model data, input data, output data, etc.), and the codeword may be an encoded bit sequence corresponding to the data related to AI. The wireless signal may be transmitted through various physical channels (e.g., PUSCH, PDSCH). Specifically, the codeword may be converted into a bit sequence scrambled by a scrambler (310). The scramble sequence used for scrambling is generated based on an initialization value, and the initialization value may include ID information of the wireless device, etc. The scrambled bit sequence may be modulated into a modulation symbol sequence by a modulator (320). Modulation schemes may include pi / 2-BPSK (pi / 2-binary phase shift keying), m-PSK (m-phase shift keying), m-QAM (m-quadrature amplitude modulation), etc.

[0116] A complex modulation symbol sequence can be mapped to at least one transport layer by a layer mapper (330). Here, a transport layer is a logical resource unit for mapping a signal or data transmitted through spatial resources to antenna ports, and one transport layer can correspond to one stream or one antenna port. Each of the complex modulation symbols included in the complex modulation symbol sequence is mapped to at least one transport layer, thereby determining which antenna port it will be transmitted through. The modulation symbols of each transport layer can be mapped to the corresponding antenna port(s) by a precoder (340). The output z of the precoder (340) can be obtained by multiplying the output y of the layer mapper (330) by a precoding matrix W of NХM. Here, N is the number of antenna ports, and M is the number of transport layers. Here, the precoder (340) may perform precoding after performing transform precoding (e.g., discrete Fourier transform (DFT) transform) on complex modulation symbols. Additionally, the precoder (340) may perform precoding without performing transform precoding.

[0117] The resource mapper (350) can map modulation symbols of each antenna port to time-frequency resources. The time-frequency resources can include multiple symbols (e.g., CP-OFDMA symbols, DFT-s-OFDMA symbols) in the time domain and multiple subcarriers in the frequency domain. The signal generator (360) generates a wireless signal from the mapped modulation symbols, and the generated wireless signal can be transmitted to another device through each antenna. To this end, the signal generator (360) can include an inverse fast Fourier transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), a frequency uplink converter, and the like.

[0118] The signal processing process for a received signal in a wireless device may be configured in reverse order of the signal processing process (310 to 360) of FIG. 3. For example, a wireless device (e.g., 200 of FIG. 2) may receive a wireless signal from the outside through an antenna port / transceiver. The received wireless signal may be converted into a baseband signal through a signal restorer. For this purpose, the signal restorer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a fast Fourier transform (FFT) module. Thereafter, the baseband signal may be restored to a codeword through a resource demapper process, a postcoding process, a demodulation process, and a descrambling process. The codeword may be restored to the original information block through decoding. Therefore, a signal processing circuit (not shown) for a received signal may include a signal restorer, a resource demapper, a postcoder, a demodulator, a descrambler, and a decoder.

[0119]

[0120] Figure 4 illustrates a communication procedure between a terminal and a base station applicable to the present disclosure. Figure 4 illustrates operations of a terminal (410) and a base station (420) transmitting and / or receiving data and operations performed prior thereto.

[0121] Referring to FIG. 4, in step 401, the terminal (410) and the base station (420) perform synchronization. For example, the terminal (410) performs an initial cell search operation. Specifically, the terminal (410) can detect at least one synchronization signal transmitted from the base station (420) according to a predefined rule. Here, the synchronization signal can include multiple synchronization signals classified according to structure or purpose (e.g., primary synchronization signal, secondary synchronization signal). Through this, the terminal (410) can check the boundary of the frame, subframe, slot, and / or symbol of the base station (420) and obtain information about the base station (420) (e.g., cell identifier).

[0122] In step 403, the terminal (410) obtains system information transmitted from the base station (420). The system information is information related to the properties, characteristics, and / or capabilities of the base station (420) required to access the base station (420) and use the service, and may be classified by content (e.g., whether it is essential for access), transmission structure (e.g., channel used, whether provided on-demand), etc., and may be classified into, for example, a master information block (MIB) and a system information block (SIB). If necessary, the terminal (410) may transmit a signal requesting system information before receiving the system information. The system information may include information related to an AI function. For example, the system information may include at least one of information related to an AI model, information related to training, and information related to inference / prediction, as information required for operations performed based on AI. However, the request and provision of the system information may be performed after a random access procedure described below.

[0123] In step 405, the terminal (410) and the base station (420) perform a random access procedure. The terminal (410) may transmit and / or receive at least one message (e.g., a random access preamble, a random access response (RAR) message, etc.) for the random access procedure based on information related to the random access channel of the base station (420) obtained through system information (e.g., channel position, channel structure, supported preamble structure, etc.). For example, the terminal (410) may transmit a preamble (e.g., MSG1) through the random access channel, receive an RAR message (e.g., MSG2), transmit a message (e.g., MSG3) including information related to the terminal (410) (e.g., identification information) to the base station (420) using scheduling information included in the RAR message, and receive a message (e.g., MSG4) for contention resolution and / or connection establishment. As another example, MSG1 and MSG3 may be sent and received as one message, or MSG2 and MSG4 may be sent and received as one message.

[0124] In step 407, the terminal (410) and the base station (420) perform signaling of control information. Here, the control information may be defined in various layers, such as a layer that controls a connection (e.g., a radio resource control (RRC) layer), a layer that handles mapping between logical channels and transport channels (e.g., a media access control (MAC) layer), and a layer that handles physical channels (e.g., a physical (PHY) layer). For example, the terminal (410) and the base station (420) may perform at least one of signaling for establishing a connection, signaling for determining settings related to communication, and signaling for indicating allocated resources. In addition, the signaling of the control information may be performed to convey information related to an AI function. For example, the information related to an AI function is information necessary for an operation performed based on AI, and may include at least one of information related to an AI model, information related to training, and information related to inference / prediction. More specifically, information related to the AI ​​function signaled in step 407 may be combined and / or combined with information related to the AI ​​function signaled in step 403, and the two may be defined in a hierarchical, mutually complementary, or substitutive structure.

[0125] In step 409, the terminal (410) and the base station (420) transmit and / or receive data. In other words, the terminal (410) and the base station (420) can process, transmit, and / or receive data based on the signaling of the control information. For example, when transmitting data, the terminal (410) or the base station (420) can perform at least one of channel encoding, rate matching, scrambling, constellation mapping, layer mapping, waveform modulation, antenna mapping, and resource mapping on the information bits. Conversely, when receiving data, the terminal (410) or the base station (420) can perform at least one of signal extraction from resources, waveform demodulation for each antenna, signal arrangement considering layer mapping, constellation demapping, descrambling, and channel decoding. Here, the transmitted data is data related to AI, and may include, for example, data for AI-based operations or data generated by AI-based operations.

[0126] Steps 401 to 409 illustrated with reference to FIG. 4 do not necessarily have to be performed in the order illustrated in FIG. 4, and the order of at least some of the steps may vary. Furthermore, at least some of steps 401 to 409 may be combined into a single step or omitted. That is, the steps illustrated in FIG. 4 may be performed in various modified forms.

[0127]

[0128] 6G communication systems and core implementation technologies of 6G systems

[0129] The 5G system defines various operating bands within FR1 (frequency range 1), which covers 410 MHz to 7125 MHz, and FR2 (frequency range 2), which covers 24,250 MHz to 71,000 MHz. Various frequencies are being discussed as operating bands for the subsequent 6G system, and the use of higher frequencies than 5G systems is also being considered for wider bandwidth and higher transmission speeds. One such band is the THz (terahertz) frequency band, which covers approximately 100 GHz to 10 THz. The THz frequency band is a band that has both the transparency of radio waves and the straightness of light waves, and communications using the THz frequency band are expected to play a transitional role from existing radio-centered communications to lightwave-based communications.

[0130] 6G systems utilizing the THz frequency band are aimed at i) very high data rates per device, ii) a very large number of connected devices, iii) global connectivity, iv) very low latency, v) reducing energy consumption of battery-free IoT devices, vi) ultra-reliable connectivity, and vii) connected intelligence with machine learning capabilities. The vision of the 6G system can be divided into four aspects: “intelligent connectivity,” “deep connectivity,” “holographic connectivity,” and “ubiquitous connectivity,” and the 6G system can be designed to satisfy the requirements as shown in [Table 1] below.

[0131] Per device peak data rate1 TbpsE2E latency1 msMaximum spectral efficiency100 bps / HzMobility supportup to 1000 km / hrSatellite integrationFullyAIFullyAutonomous vehicleFullyXRFullyHaptic CommunicationFully

[0132] At this time, the 6G system may have key factors such as enhanced mobile broadband (eMBB), ultra-reliable low latency communications (URLLC), massive machine type communications (mMTC), AI integrated communication, tactile internet, high throughput, high network capacity, high energy efficiency, low backhaul and access network congestion, and enhanced data security.

[0133] Figure 5 illustrates an example of a communication structure that can be provided in a 6G system applicable to the present disclosure. Referring to Figure 5, a 6G system is expected to have 50 times higher simultaneous wireless communication connectivity than a 5G wireless communication system. URLLC, a key feature of 5G, is expected to become an even more important technology in 6G communications by providing end-to-end latency of less than 1 ms. Furthermore, 6G systems will have significantly better volumetric spectral efficiency than the commonly used area spectral efficiency. 6G systems can provide very long battery life and advanced battery technologies for energy harvesting, so that mobile devices in 6G systems may not need to be separately charged. New network characteristics in 6G may include the following:

[0134] - Satellite integrated network: 6G is expected to integrate with satellites to provide a global mobile network. The integration of terrestrial, satellite, and airborne networks into a single wireless communications system is crucial for 6G.

[0135] Connected Intelligence: Unlike previous generations of wireless communication systems, 6G is revolutionary, upgrading the wireless evolution from "connected objects" to "connected intelligence." AI can be applied at every stage of the communication process (or at every signal processing step, as described below).

[0136] - Seamless integration of wireless information and energy transfer: 6G wireless networks will transfer power to charge the batteries of devices such as smartphones and sensors. Therefore, wireless information and energy transfer (WIET) will be integrated.

[0137] - Ubiquitous super 3D connectivity: Access to networks and core network functions of drones and very low Earth orbit satellites will create super 3D connectivity in 6G ubiquitous.

[0138] Some general requirements for the new network characteristics of 6G, such as the above, may be as follows:

[0139] - Small cell networks: The concept of small cell networks was introduced to improve received signal quality in cellular systems by increasing throughput, energy efficiency, and spectral efficiency. Consequently, small cell networks are essential for 5G and beyond-5G (5GB) communication systems. Accordingly, 6G communication systems also adopt the characteristics of small cell networks.

[0140] Ultra-dense heterogeneous networks: Ultra-dense heterogeneous networks will be another key feature of 6G communication systems. Multi-tier networks comprised of heterogeneous networks improve overall QoS and reduce costs.

[0141] High-capacity backhaul: Backhaul connections are characterized by high-capacity backhaul networks to support high-volume traffic. High-speed fiber optics and free-space optics (FSO) systems may be potential solutions to this problem.

[0142] - Radar technology integrated with mobile technology: High-precision localization (or location-based services) through communications is a key feature of 6G wireless communication systems. Therefore, radar systems will be integrated with 6G networks.

[0143] - Softwarization and virtualization: Softwarization and virtualization are two critical features that form the foundation of the design process for 5GB networks to ensure flexibility, reconfigurability, and programmability. Furthermore, billions of devices can be shared on a shared physical infrastructure.

[0144] To satisfy the above-mentioned characteristics, the core implementation technologies of the 6G system may include artificial intelligence (AI), THz (terahertz) communication, optical wireless technology, FSO backhaul network, massive MIMO technology, blockchain, 3D networking, quantum communication, unmanned aerial vehicles, cell-free communication, wireless information and energy transfer (WIET), integration of sensing and communication, integration of access backhaul networks, holographic beamforming, big data analysis, and large intelligent surface (LIS).

[0145] For example, THz communication can be utilized in 6G systems. THz communication is a communication that utilizes a spectrum in a frequency band between 0.3 THz and 3 THz with a corresponding wavelength in the range of 0.1 mm to 1 mm, as shown in FIG. 6. Referring to FIG. 6, the frequency band of THz waves is located in the middle region between the infrared band and the millimeter wave band, and therefore, THz waves can be understood as radio waves with the shortest wavelength and light waves with the longest wavelength. Therefore, THz waves share some of the characteristics of infrared and microwave waves, and specifically, they can simultaneously have the transparency of electromagnetic waves and the straightness of light waves.

[0146]

[0147] Fig. 7 illustrates a THz communication method applicable to the present disclosure. Referring to Fig. 7, THz wireless communication refers to wireless communication using THz waves having a frequency of approximately 0.1 to 10 THz (1 THz = 1012 Hz), and may refer to terahertz (THz) band wireless communication using a very high carrier frequency of 100 GHz or higher. THz waves are located between the RF (Radio Frequency) / millimeter (mm) and infrared bands, and (i) compared to visible light / infrared rays, they penetrate non-metallic / non-polarizable materials well, and compared to RF / millimeter waves, they have a shorter wavelength, thus having high linearity and enabling beam focusing.

[0148] In addition, since the photon energy of THz waves is only a few meV, it has the characteristic of being harmless to the human body. The frequency band expected to be used for THz wireless communication may be the D-band (110 GHz to 170 GHz) or H-band (220 GHz to 325 GHz) bands where propagation loss due to absorption of molecules in the air is small. In addition to 3GPP, standardization discussions for THz wireless communication are being centered around the IEEE 802.15 THz WG (working group), and standard documents issued by the IEEE 802.15 TG (task group) (e.g., TG3d, TG3e) can specify or supplement the contents described in this specification. THz wireless communication can be applied to wireless cognition, sensing, imaging, wireless communication, THz navigation, etc.

[0149] Specifically, referring to Fig. 7, THz wireless communication scenarios can be categorized into macro networks, micro networks, and nanoscale networks. In macro networks, THz wireless communication can be applied to vehicle-to-vehicle (V2V) connections and backhaul / fronthaul connections. In micro networks, THz wireless communication can be applied to fixed point-to-point or multi-point connections such as indoor small cells, wireless connections in data centers, and near-field communication such as kiosk downloading. Table 2 below shows examples of technologies that can be utilized in THz waves.

[0150] Transceivers DeviceAvailable immature: UTC-PD, RTD and SBDModulation and codingLow order modulation techniques (OOK, QPSK), LDPC, Reed Soloman, Hamming, Polar, TurboAntennaOmni and Directional, phased array with low number of antenna elementsBandwidth69 GHz (or 23 GHz) at 300 GHzChannel modelsPartiallyData rate100 GbpsOutdoor deploymentNoFee space lossHighCoverageLowRadio Measurements300 GHz inddorDevice sizeFew micrometers

[0151] FIG. 8 illustrates a THz signal generation method applicable to the present disclosure. FIG. 9 also illustrates a wireless communication transceiver applicable to the present disclosure. Referring to FIGS. 8 and 9, the optical device-based THz wireless communication technology refers to a method of generating and modulating a THz signal using an optical device. The optical device-based THz signal generation technology is a technology that generates an ultra-high-speed optical signal using a laser and an optical modulator, and converts it into a THz signal using an ultra-high-speed photodetector. Compared to a technology that uses only electronic devices, this technology makes it easy to increase the frequency, enables high-power signal generation, and obtains a flat response characteristic over a wide frequency band. For the optical device-based THz signal generation, as illustrated in FIG. 8, a laser diode, a wideband optical modulator, and an ultra-high-speed photodetector are required. In the case of FIG. 8, light signals from two lasers with different wavelengths are combined to generate a THz signal corresponding to the wavelength difference between the lasers. In Fig. 8, an optical coupler refers to a semiconductor device that transmits an electrical signal using optical waves to provide electrical isolation and coupling between circuits or systems, and a uni-travelling carrier photo-detector (UTC-PD) is a type of photodetector that uses electrons as active carriers and reduces the travel time of electrons through bandgap grading. The UTC-PD is capable of photodetection at 150 GHz or higher.In Fig. 9, EDFA (erbium-doped fiber amplifier) ​​represents an erbium-doped fiber amplifier, PD (photo detector) represents a semiconductor device that can convert an optical signal into an electrical signal, OSA represents an optical module (optical sub assembly) that modularizes various optical communication functions (e.g., photoelectric conversion, electro-optical conversion, etc.) into a single component, and DSO represents a digital storage oscilloscope.

[0152] Figure 10 illustrates a transmitter structure applicable to the present disclosure.

[0153] Referring to Figure 10, in order to modulate data into an optical signal, an optical source such as a laser can be passed through an optical wave guide to change the phase of the signal, etc. At this time, data is loaded by changing the electrical characteristics through a microwave contact, etc. Therefore, the optical modulator output is formed as a modulated waveform.

[0154] Data may be provided from a data signal generator. Here, the data may include various user data, configuration information, control information, etc. transmitted through a channel. Furthermore, the data may include data related to AI-based operations, such as information for configuring an AI model, input / output data for tasks of the AI ​​model, etc. To this end, components related to AI functions (e.g., an AI processing unit) may be included in the data signal generator or may be linked to the data signal generator.

[0155] An optical / electronic converter (O / E converter) can generate THz pulses by optical rectification using a nonlinear crystal, photoelectric conversion using a photoconductive antenna, or emission from a bunch of relativistic electrons. The THz pulse generated in the above manner can have a length in the range of femtoseconds to picoseconds. The optical / electronic converter (O / E converter) performs down conversion by utilizing the nonlinearity of the device.

[0156] Considering the THz spectrum usage, it is likely that multiple contiguous GHz bands will be used for THz systems, either fixed or for mobile services. For an outdoor scenario, the available bandwidth can be categorized based on an oxygen attenuation of 10^2 dB / km in the spectrum up to 1 THz. Accordingly, a framework in which the available bandwidth is divided into multiple band chunks can be considered. As an example of this framework, if the THz pulse length for a single carrier is set to 50 ps, ​​the bandwidth (BW) becomes approximately 20 GHz.

[0157] Effective down-conversion from the infrared band to the THz band depends on how to utilize the nonlinearity of the optical / electrical converter (O / E converter). In other words, to down-convert to the desired THz band, it is necessary to design an O / E converter with the most ideal non-linearity for transferring to the THz band. If an O / E converter that is not suitable for the target frequency band is used, errors in the amplitude and phase of the pulse are likely to occur.

[0158] A THz transmission and reception system can be implemented using a single optical-to-electrical converter in a single-carrier system. Depending on the channel environment, optical-to-electrical converters may be required as many as the number of carriers in a multi-carrier system. This phenomenon will be particularly noticeable in a multi-carrier system that utilizes multiple broadbands according to the aforementioned spectrum usage plan. In this regard, a frame structure for the multi-carrier system may be considered. A signal down-frequency converted based on an optical-to-electrical converter may be transmitted in a specific resource region (e.g., a specific frame). The frequency region of the specific resource region may include multiple chunks. Each chunk may be composed of at least one component carrier (CC).

[0159] Transmitting system information (e.g., MIB) in the THz frequency band can be inefficient because the beam width becomes narrower in high-frequency bands, requiring more beam sweeps to cover the entire cell area. This method of transmitting system information is particularly inefficient when there are only a few users within the cell. Accordingly, a system information transmission procedure, such as that illustrated in FIG. 11, may be employed.

[0160] Figure 11 illustrates a system information transmission procedure applicable to the present disclosure. Figure 11 illustrates an example of a procedure for transmitting system information for THz communication. The procedure illustrated in Figure 11 can be combined with various embodiments of the present disclosure described below. For example, the embodiments described below can be performed based on the system information acquired by the procedure illustrated in Figure 11. As another example, information and / or data transmitted in the procedure illustrated in Figure 11 can be generated and / or processed according to the embodiments described below.

[0161] Referring to FIG. 11, in step 1101, the base station (1120) transmits system information of cell #1 through cell #2. That is, the base station (1120) provides at least two cells, cell #1 uses a THz frequency band, and cell #2 uses a frequency band other than the THz frequency band. Here, the system information may include at least one of an SFN, a PDCCH configuration for SIB1, cell barring, cell re-selection, and subcarrier spacing generated in a higher layer, and may include at least one of an SFN, a half frame indicator, and an SSB index generated in a physical layer. For this purpose, as an example, cell #1 and cell #2 may have a relationship of a secondary cell and a primary cell.

[0162] In step 1103, UE (1110) acquires synchronization for cell #1. Synchronization can be acquired by detecting a synchronization signal. Typically, synchronization is acquired before receiving system information. However, since system information for cell #1 is received from cell #2, synchronization acquisition for cell #1 can be performed after receiving the system information. For example, UE (1110) can acquire synchronization based on system information. However, unlike FIG. 11, in another example, synchronization acquisition can be performed before step 1101.

[0163] In step 1105, UE (1110) transmits a signal for accessing cell #1. For example, the signal may include a random access preamble. The structure of the signal and the resources (e.g., channels) for transmitting the signal can be identified through system information. Thereafter, in step 1107, UE (1110) and base station (1120) perform an access procedure for cell #1 and communicate. In this step, operations according to various embodiments described below may be performed.

[0164] The procedure described with reference to FIG. 11 may be performed when UE (1101) first connects to cell #1 of base station (1120). Alternatively, a similar procedure may be performed when UE (1101) hands over to cell #1 of base station (1120). However, in the case of handover, system information of cell #1 may be received from a cell of a base station other than cell #2 of base station (1120).

[0165]

[0166] Communications in the THz band are expected to experience extremely severe path loss, and to overcome this, terminals and base stations must use extremely sharp beams. The use of sharp beams means that terminals and base stations must perform beam control in addition to beamforming, and the number of beams used increases significantly. Consequently, it takes a very long time to align the transmit and receive beams between the base station and terminals. Furthermore, if the beam alignment between the base station and terminals is misaligned due to the movement or movement of the terminals, frequent re-alignment of the beams is required, which can lead to link instability. Accordingly, a beam management procedure, as illustrated in FIG. 12 below, may be used.

[0167] FIG. 12 illustrates a beam management procedure applicable to the present disclosure. FIG. 12 illustrates an example of a procedure for searching and / or selecting beams for THz communication. The procedure illustrated in FIG. 12 may be combined with various embodiments of the present disclosure described below. For example, the embodiments described below may be performed using at least one beam acquired by the procedure illustrated in FIG. 11. As another example, information and / or data transmitted in the procedure illustrated in FIG. 12 may be generated and / or processed according to the embodiments described below. Herein, a beam may be referred to as a 'spatial domain filter', a 'spatial domain transmit filter', a 'spatial domain receive filter', and other terms having equivalent technical meanings thereto.

[0168] Referring to FIG. 12, in step 1201, a base station (1220) configures resources for beam management. Here, the resources may include at least one of time-frequency resources, channels, and spatial resources (e.g., antenna ports). For example, the base station (1220) may utilize a beam search signal (BSS) that is transmitted spatially separated from an existing downlink signal / channel for beam search. Here, the BSS may be transmitted based on a dedicated port for beam search. The dedicated port may be a different port from a port for transmitting an existing downlink signal / channel (e.g., SSB, PDSCH, etc.). BSS is a term defined for convenience of explanation, and the technical concept according to the present embodiment is not limited to the term BSS itself. That is, a signal transmitted based on a dedicated port defined / configured for beam search may be included in the technical concept according to the present embodiment.

[0169] In step 1203, the base station (1201) transmits measurement signals using multiple transmission beams. For example, the measurement signals may include at least one of a reference signal and a synchronization signal. At this time, the measurement signals may be transmitted as many times as the number of beams that require measurement, and may be transmitted in a multi-beam transmission method that forms multiple beams simultaneously to reduce sweeping time. Here, the multi-beam transmission may be performed based on at least one of a multi-panel, a sub-array, and a true time delay (TTD).

[0170] In step 1205, the UE (1210) transmits a feedback signal to the base station (1220). The feedback signal indicates at least one beam selected by the UE (1210). The UE (1210) may select at least one preferred beam based on the measurement signals received in step 1203. In step 1207, the UE (1210) and the base station (1220) perform communication. At this time, the UE (1210) and the base station (1220) may perform communication using the beam selected in step 1205. If channel reciprocity is established, the transmission beam of the UE (1210) may also be determined through steps 1203 and 1205, and thus, the transmission operation of the UE (1210) may also be performed using the beam selected in step 1205. If channel reciprocity is not established, a procedure including transmitting measurement signals of the UE (1210) and transmitting feedback signals of the base station (1220) may be performed to determine the transmission beam of the UE (1210). In step 1207, operations according to various embodiments described below may be performed.

[0171] Specific embodiments of the present disclosure

[0172] In multiple access communication systems, rate-splitting allows multiple users to simultaneously share a single frequency band, facilitating efficient data transmission. In rate-splitting, a total data bit is divided into several parts, each of which is allocated to a specific user to maximize transmission efficiency. This division and allocation are performed based on varying channel conditions and requirements among the various users, and the data is transmitted simultaneously. Each user receives and decompresses the data portion allocated to them, thereby reconstructing the original data. Rate-splitting can be referred to as rate-splitting multiple access (RSMA), a type of multiple access technique that focuses on efficient utilization of frequency resources.

[0173] To ensure efficient data communication, various methods can be proposed that leverage the characteristics of rate-sharing techniques. For example, to satisfy the user's quality of experience (QoE), cooperative communication can be proposed to improve throughput through cooperation with adjacent cells, rather than communication through a single cell. This cooperative communication technique can be referred to as the coordinated multi-point (CoMP) technique. CoMP is a technology that performs communication with adjacent cells to improve the throughput of user terminals located at cell edges. However, to overcome poor performance in the serving cell using CoMP, the coordinated cell must be sacrificed. Consequently, CoMP causes performance degradation for existing user terminals in the cooperative cell. Therefore, techniques are needed to allocate resources and schedule them to improve the performance of the serving cell, while minimizing the performance degradation for existing user terminals in the cooperative cell.

[0174] Furthermore, communication can be performed based on a new communication system, the Intelligent Wireless Environment. In this intelligent wireless environment, parameters related to a reconfigurable intelligent surface (RIS) can be used as factors that control the wireless channel, similar to a transmitter and receiver. This can overcome problems that are intractable in existing communication systems, such as channel reconfiguration and Shannon's channel capacity limit. However, in an intelligent wireless environment, additional channel measurements using the RIS are required, and the RIS must be considered simultaneously with the transmitter and receiver, which can lead to complex and challenging issues.

[0175] FIG. 13 illustrates an example of a wireless channel environment according to an embodiment of the present disclosure. Referring to FIG. 13, in an existing communication system, the wireless channel environment (H) is naturally fixed and may be in a random state that cannot be controlled. Therefore, the transmitter (1310) and the receiver (1320) can find an optimized transmission and reception method by adapting to the channel. The transmitter (1310) and the receiver (1320) can be controlled to measure the channel state through a signal (e.g., a reference signal) and perform optimization based on the measured channel state. However, in a terahertz environment where signal loss is high and multipath application is difficult, and in a non-line of sight (NLOS) environment such as a shaded area, there may be limitations in data transmission. For example, the following [Mathematical Formula 1] can represent Shannon's capacity limit. At this time, even if the size of the channel capacity is increased by applying precoding and processing to the transmission signal P in [Mathematical Formula 1], the channel If the size is small, there may be limitations in increasing the channel capacity.

[0176] In a fixed wireless channel environment, there may be a limit to increasing the channel capacity based on [Mathematical Formula 1]. In this case, communication using RIS can secure multiple paths between the transmitter (1310) and the receiver (1320), and the above-described channel That is, in an intelligent wireless environment, the wireless channel environment based on RIS can be an adjustable factor, thereby increasing the channel capacity.

[0177]

[0178] Figure 14 illustrates an example of an intelligent wireless environment according to one embodiment of the present disclosure. Referring to Figure 14, in an intelligent wireless channel environment, a wireless channel can be a factor for optimization. More specifically, in the above-described Fig. 13, optimization can be performed in the transmitter (1310) and the receiver (1320) based on "max{f(Tx, Rx)}" as an endpoint optimization, as described above. However, in Fig. 14, optimization can be performed in the transmitter (1410) and the receiver (1420) based on "max{f(Tx, Rx, H)}" as an endpoint optimization. That is, in an intelligent wireless environment, the channel can be optimized based on an intelligent reflector. can be used as a factor for optimization.

[0179] FIGS. 15A and 15B illustrate examples of a conventional wireless channel environment and an intelligent wireless channel environment according to an embodiment of the present disclosure. For example, referring to FIG. 15A, the conventional wireless channel environment may be P1. Further, referring to FIG. 15B, the intelligent wireless channel environment may be P2. At this time, in FIGS. 15A and 15B, when the x signal is transmitted from the encoder (1510) through a wireless channel, the decoder (1520) may receive the y signal. At this time, the probability of P1 in the conventional wireless channel environment is fixed, and the decoder (1520) may transmit feedback to the encoder (1510) based on measurements of the transmitted signal. The encoder (1510) may perform optimization to adapt to the wireless channel environment based on the feedback from the decoder (1520). Specifically, the decoder (1520) can measure a channel quality indicator (CQI) for a transmitted signal based on a reference signal transmitted by the encoder (1510) and feed it back. The encoder (1510) can adjust a modulation coding scheme (MCS) based on the fed-back information, provide information about this to the decoder (1520), and communicate with the decoder (1520).

[0180] On the other hand, referring to FIG. 15b, in an intelligent wireless channel environment, the wireless channel environment P2 is recognized, and the wireless channel environment can be changed through RIS control. At the same time, the decoder (1520) can perform measurement on the received transmission signal and transmit feedback thereon to the encoder (1510). That is, the encoder (1510) can perform optimization by receiving feedback information based on RIS control and feedback information of the decoder (1520). At this time, the encoder (1510) can change the wireless channel environment by adjusting the RIS, and optimization can be performed considering the wireless channel environment and the encoder (1510).

[0181]

[0182] In wireless communication systems, RSMA technology can be used for multiple access. By utilizing RSMA technology, interference and resources between multiple users can be efficiently managed. Figure 16 illustrates an example of RSMA-based transmission according to an embodiment of the present disclosure. Referring to Figure 16, k terminals (1630-1 to 1630-k) can communicate based on RSMA technology. A key feature of RSMA technology is to classify messages into common messages and private messages. The base station (1610) separates messages to be transmitted to terminals (1630-1 to 1630-k) into common messages and private messages. The common messages of terminals (1630-1 to 1630-k) can be transmitted as a unified common message. The base station (1610) transmits an RSMA signal containing a unified common message and private messages of the terminals (1630-1 to 1630-k) to k terminals (1630-1 to 1630-k).

[0183] The terminals (1630-1 to 1630-k) regard the private messages included in the received RSMA signal as interference and decode the integrated common message. The terminals (1630-1 to 1630-k) can separate the integrated common message and receive the common message transmitted to them. Thereafter, the terminals (1630-1 to 1630-k) remove the integrated common message portion from the received RSMA signal using a sequential interference cancellation technique. Each of the terminals (1630-1 to 1630-k) can decode the private messages using the signal from which the interference due to the common message has been removed. Therefore, the decoding of the private messages can be performed based on a signal that only contains interferences with the private messages of other terminals. The base station (1610) can adjust the ratio of interference signals by adjusting the ratio of common messages and private messages based on the channel conditions of the terminals (1630-1 to 1630-k). Since RSMA technology is still in the research phase, there may not be a standard guideline for how to use frequency and time resources. However, RSMA technology can be researched in the same way as non-orthogonal multiple access (NOMA) technology in terms of frequency usage, allowing all users to share frequency and time resources.

[0184] FIG. 17 illustrates an example of a structure of a transmitter and a receiver supporting 1-layer RSMA according to an embodiment of the present disclosure. Referring to FIG. 17, in a 1-layer RSMA system, a transmitter (1710) and a receiver (1720) can transmit and receive wireless signals. In FIG. 17, the number of antennas can be changed according to the antenna structures of the transmitter (1710) and the receiver (1720). The transmitter (1710) of FIG. 17 can represent a structure for transmitting messages to k users within a baseband. In a 1-layer RS ​​(rate split) structure, the transmitter (1710) can combine common messages of all users into one and transmit the remaining individual messages to each user. Each user's message , and each user's message is distributed as a common message for each user through the message distributor (1701). and personal messages for each user can be divided into. Common messages for users are combined into a common message through a common message combiner (1703). can be integrated. Each of the integrated common message and private messages is transmitted through the encoder (1705). can be encoded. Afterwards, the encoded signal is precoded through a precoder (1707) and can be transmitted after undergoing radio processing (RF processing). That is, the following transmission signal is processed by the transmitter (1710) for K+1 messages. can be expressed as in [Mathematical Formula 2].

[0185]

[0186] In [Equation 2], means the precoding coefficient of the integrated common message, represents the precoding coefficient of a private message, and K represents the number of terminals.

[0187] Precoding matrix The signal received by the kth user can be expressed as in [Mathematical Formula 3] below.

[0188]

[0189] In [Equation 3], means the channel of the kth user, stands for Gaussian Channel Noise.

[0190] The transmission rate of the common message for each user and the personal message for each user can be expressed as in [Mathematical Formula 4] below.

[0191]

[0192] In [Equation 4], is the common message transmission rate received by the kth user, is the personal message delivery rate received by the kth user, represents the variance of Gaussian channel noise.

[0193] In an RSMA system, the minimum transmission rate of a common message required for all users to decrypt the common message can satisfy the following [Mathematical Formula 5].

[0194]

[0195] The receiver (1720) of the kth user receives the received signal , and first receive the unified common message can be decrypted through the decoder (1709). Unified common message is the common message of the kth user through the common message distributor (1713). can be obtained. In addition, the receiver (1720) receives the received signal Unified common message decrypted in After removing the common message through the sequential interference cancellation technique, the remaining private messages can be decrypted through the decoder (1711). The receiving unit (1720) decrypts the common message and private messages can generate a message for the kth user by combining them through a combiner (1715).

[0196] Multi-cell networks can be utilized in communication environments of RSMA systems. The present disclosure proposes a method for achieving a downlink maximum sum-rate (MSR) through optimization using rate division in a multi-cell network and scheduling. Optimizing beamforming and RIS of base stations in cooperative cells can minimize the impact on cooperative cells. Utilizing the procedures proposed in the present disclosure can increase the throughput of user terminals in a serving cell and minimize interference caused by cooperative communication.

[0197] Multi-cell networks can consist of coordinated base stations that collaborate with serving base stations that service user terminals. User terminals connected to the serving base station may experience performance degradation due to signal-to-interference plus noise ratio (SINR) degradation at cell edges. To overcome this, coordinated multi-point (CoMP) technology, a multi-cell cooperation technique, has been studied since 3GPP Release 11. With CoMP, a single terminal can utilize not only the serving cell but also neighboring cells. This creates a type of virtual MIMO. CoMP technology can improve throughput for users experiencing performance degradation at the cell edge. However, CoMP technology requires cooperation between base stations to support users, which increases network complexity. For example, data exchange and resource scheduling between each base station must be coordinated, and the procedures to manage these factors increase complexity. Additionally, delays in data exchange and coordination can occur, interference can occur for users connected to the cooperating base station, and communication performance can be degraded for users connected to the cooperating base station. To overcome these drawbacks, various CoMP techniques have been proposed. Specifically, CoMP technologies can be categorized as shown in Figure 18.

[0198] Figure 18 illustrates an example of the classification of cooperative communication according to the present embodiment. The CS (Coordinated Scheduling) method shares channel information (e.g., CQI, PMI, RI, SINR, etc.) between a serving cell and cooperative cells and allocates appropriate frequency resources through scheduling. The CS method can dynamically allocate resources according to channel conditions. The CB (Coordinated Beamforming) method is a method that does not dynamically allocate frequency resources, but rather allocates beam patterns differently. The CB method performs cooperative communication and adjusts the beamforming pattern to avoid interference. The CS method and the CB method can be used together. Therefore, different frequency resources can be dynamically allocated, and the beamforming pattern can be determined through cooperation between base stations. Therefore, a method that combines the CS method and the CB method can avoid interference through the CS method and increase the throughput of reception performance through the CB method.

[0199] Joint transmission (JT) is a method in which a serving cell and cooperative cells transmit the same data simultaneously using the same frequency and time resources. Since the terminal receives the same data repeatedly, the terminal's throughput can be increased. However, synchronized scheduling is required for simultaneous transmission. This requires low-latency signaling for simultaneous transmission, and X2 / Xn interfaces may be required depending on the deployment of the JT cell and serving cell. Dynamic point selection (DPS) is a method of sharing the same data between multiple cells, a type of JP method. The cell backhaul is configured to transmit the same data to each cell. In DPS, data transmission is performed through a cell with good channel conditions depending on the terminal's channel conditions, and dynamic switching is performed on a subframe basis. When transmission is initiated in a cell with good condition, the remaining DPS cells mute the corresponding subframe.

[0200] Rather than a specific technique for cooperative communication, a framework may be proposed. The framework, consisting of three stages—inputs, decision-making, and outputs—will be referred to as generalized CoMP (GCoMP). Figure 19 illustrates an example of the structure of GCoMP according to one embodiment of the present disclosure.

[0201] First, let's look at the input stage. It consists of user requirements, CoMP architecture, and CoMP scenarios. The first component of the input stage, user requirements, can include at least one of the following: throughput, capacity, latency, mobility, connectivity, and security. For example, using multiple transmissions can increase capacity.

[0202] The second input component, CoMP architecture, can typically be configured as a centralized coordination structure or a distributed coordination structure. For example, a centralized coordination structure can use C-RAN (Cloud RAN). C-RAN can reduce network management resources and operational expenditure (OPEX) in CoMP. However, it increases the load on the backhaul and may have difficulty meeting latency requirements. Therefore, C-RAN is difficult to apply to delay-sensitive services such as V2X. Therefore, concepts such as fog / edge computing can be proposed, and research can be conducted to reduce the latency of the centralized coordination structure.

[0203] The third input component, the CoMP scenario, consists of three CoMP scenarios proposed by 3GPP. Specifically, the CoMP scenarios are the Homogeneous Intra-site CoMP scenario, the Inter-site CoMP scenario, and the HetNets scenario. In the Intra-site CoMP scenario, cells and nodes coexist, so there is no additional backhaul load. However, the other two scenarios require high-speed backhaul links and additional connections between transmission points (TPs). Furthermore, the HetNets scenario may require different techniques than existing communication methods because it includes non-terrestrial networks (NTNs).

[0204] The second stage of GCoMP configuration is the decision-making stage. This stage determines the most optimal CoMP technique using the inputs from the input stage. The decision-making stage can approach the inputs using one of three approaches: user-centric, network-centric, or hybrid. The user-centric approach aims to meet the needs of specific users. The network-centric approach simplifies the implementation of the entire network and aims to maximize performance for all users. The hybrid approach combines user-centric and network-centric approaches to tailor the network and the needs of specific users to the specific situation. Furthermore, these approaches can be updated based on specific event triggers or periodically.

[0205] The final stage, the output stage, determines outputs based on the input and decision stages. Based on the results of the previous two stages, the outputs can be determined using proven CoMP techniques such as CS / CB, JT, and DPS. GCoMP is a framework proposed to flexibly respond to 5G and the numerous services that will be added in the future. Therefore, rather than using a fixed CoMP technique, it aims to configure coordination areas (CAs) according to various requirements and dynamically meet those requirements based on the situation.

[0206]

[0207] This CoMP technology can be used with rate-splitting multiple access (RSMA). Among the RSMA strategies considered in the transceiver architecture design of downlink RSMA, the rate-splitting and common message decoding (RS-CMD) technique and the generalized rate division (RS) technique can be proposed, and their structures can be represented as shown in FIGS. 20 and 21.

[0208] The RS-CMD technique was proposed for application to C-RAN. The streams divided through rate division in the backhaul are transmitted to each base station, and the base station distributes each stream to a user. The user can receive each distributed stream and combine the divided streams. A characteristic of the RS-CMD technique is that there is no message combiner in the transmitter. Fig. 20 illustrates an example of the architecture of a transmitter and receiver of RS-CMD according to an embodiment of the present disclosure. Fig. 20 illustrates an RS-CMD transmitter and receiver for K users (2020-1 to 2020-K) in a MISO (multiple input single output) BC (broadcast channel). In the transmitter (2010), a message for user k (2020-k) is transmitted. Is It is divided into two sub-messages. As a result, when there are K users, 2K sub-messages must be encoded. Therefore, the transmission signal for K users can be expressed as [Mathematical Formula 6] below.

[0209]

[0210] In [Equation 6], denotes the beamformer coefficient for the common message of the kth user, denotes an encoded common message stream for the kth user, denotes the beamformer coefficient for the private message of the kth user, represents an encoded private message stream for the kth user.

[0211] In addition, user k (2020-k) must have a successive interference cancellation (SIC) structure using K layers. User k (2020-k) decodes K common streams and then private streams. Decodes the decoding order. When defined as, the common stream of user k (2020-k) The transmission rate of and personal streams Transmission rate for is defined as in [Mathematical Formula 7] below.

[0212]

[0213] In [Equation 7], means the channel coefficient of the kth user, denotes the beamformer coefficient of the common message for the kth user, denotes the private message beamformer coefficient for the kth user, and for the kth user, stands for channel noise variance.

[0214] Therefore, the achievable rate for user k (2020-k) is as follows [Mathematical Formula 8].

[0215]

[0216] FIG. 21 illustrates an example of a CoMP JT (joint transmission) model in an environment with three users (2120-1 to 2120-3) according to an embodiment of the present disclosure. A generalized rate-splitting framework can be implemented to increase the achievable transmission rate while considering quality of service (QoS). In FIG. 21, a central controller (2110) is a device that performs rate-splitting to apply CoMP. In a CoMP technique using generalized rate-splitting, the central controller (2110) performs rate-splitting, optimizes messages for user k, and then distributes each message to base stations. In FIG. 21, when the central controller (2110) is performed by a core network such as a backhaul, it can be assumed that there is no delay in the channel between the central controller (2110) and the base stations.

[0217] Referring to Figure 21, messages for three users (2120-1 to 2120-3) Each of the four sub-messages { is divided into four sub-messages through the message splitter (2130). }, { }, { } is divided by the transmission rate division technique. Each sub-message can be combined by message combiners (2140-1 to 2140-4) according to the encoding order and then encoded by the encoder (2150). For example, the sub-message { } is combined by the first message combiner (2140-1) and then converted into a 3-order stream by the encoder (2150). can be encoded as { }, { }, { } Each of them is combined by each of the message combiners (2140-2 to 2140-4) and then the secondary stream is combined by the encoder (2150). Each of them can be encoded. The encoded signal can be transmitted through the antennas (2170-1 to 2170-M) through the linear precoder (2160), and the signal to be finally transmitted is expressed as in [Mathematical Formula 9] below.

[0218]

[0219] In [Equation 9], means an encoded ℓ-order stream, silver It refers to the beamformer coefficient for .

[0220] Therefore, the beamformer for the transmission signal is also This should be determined. The transmission signal x can be transmitted to users (2120-1 to 2120-3) through the base station. Each of the users (2120-1 to 2120-3) classifies the sub-messages through sequential interference removal units based on the received signal. For example, in the case of the first user (2120-1), the stream must be decoded using sequential interference cancellers (2180-1 to 2180-3). That is, the generalized RS technique divides user messages into sub-messages and performs optimization by order. Therefore, when RSMA is used in the CoMP technique, QoS can be guaranteed through sub-messages, and the transmission ratio of the serving base station and the cooperative base station can be adjusted according to the channel condition. By adjusting the transmission ratio, the RSMA technique can perform dynamic interference management compared to the non-orthogonal multiple access (NOMA) technique or the spatial division multiple access (SDMA) technique, and thus shows relatively high performance. However, the RSMA technique requires high complexity of the transceiver as the number of users increases. Therefore, in a macro cell environment, the use of the RSMA technique can be suggested due to the high complexity. That is, as the number of users increases, performance degradation due to the complexity of the transceiver may occur, and a 1-layer RS ​​that shows the performance that is least dependent on the number of users can be used.

[0221] Since CoMP technologies aim to improve cell-edge terminal performance, they may sacrifice other users in the serving cell and users in cooperative cells. Therefore, a beamforming decision method and a frequency resource allocation method that consider neighboring terminals are needed in cooperative cells. The present disclosure proposes a method to mitigate interference from other users in the serving cell through 1-layer RS-based communication. In addition, the present disclosure proposes a method for determining beamforming of a cooperative cell considering RIS to minimize the impact on users in existing cooperative cells. In addition, the present disclosure proposes a method for allocating common messages to the serving cell through rate division and allocating private messages to cooperative cells when the throughput drops due to degradation of the SINR of users in the serving cell to improve the SINR of users included in the serving cell.

[0222] To this end, the serving cell and the cooperative cell perform signaling for scheduling, and the central processor that acts as a backhaul performs rate split optimization and transmits the optimization result to each cell. The optimized common message is transmitted to the serving cell, which then transmits the common message to the user. In addition, the private message is transmitted to the cooperative cell, which then transmits the private message to the user. Since the private message of the user is not transmitted to the serving cell, the SINR of the users belonging to the serving cell can be improved. The cooperative cell can minimize the impact on other users within the existing cooperative cell by performing RIS beamforming optimization with the users existing in the serving cell. Therefore, the method proposed in the present disclosure can guarantee the throughput of the users of the serving cell while minimizing the impact on the cooperative cell, and the SINR of other users within the serving cell can be improved.

[0223] Below, specific procedures for performing cooperative communication using the RSMA technique proposed in this disclosure are described. For convenience, a mobile communication environment with K multi-users based on a downlink RSMA system is assumed, but this is not limited to this scenario. For example, the same procedure can also be applied to other similar cooperative communication techniques using an uplink RSMA system or RIS.

[0224] FIG. 22 illustrates an example of a wireless communication environment performing cooperative communication according to one embodiment of the present disclosure. Although FIG. 22 illustrates a wireless communication environment for improving the throughput of a cooperative communication terminal (2230), which is the kth terminal located at the cell edge of a base station, the cooperative communication terminal (2230) does not necessarily have to be located at the cell edge. That is, regardless of the location of the cooperative communication terminal (2230), if signals can be transmitted and received from the first base station (2210) and the second base station (2220), the procedures proposed in the present disclosure can be performed identically or similarly. The present disclosure assumes that there is a serving cell and a cooperative cell for cooperative communication, such as the CoMP technique. FIG. 22 illustrates an example in which the serving cell is operated by the first base station (2210) and the cooperative cell is operated by the second base station (2220).

[0225] The two cells may be connected to a central processor (CP) (2240) that performs a backhaul role for the upper layer. The central processor (2240) optimizes the transmission rate division for the connected base stations (2210, 2220) and / or cells, and transmits data to each of the base stations (2210, 2220). In FIG. 22, the central processor (2240) is represented as a separate device from the base stations (2210, 2220). However, according to various embodiments, the central processor (2240) may be implemented to be included in one of the base stations (2210, 2220).

[0226] To perform scheduling for cooperative communication of base stations (2210, 2220), signaling between base stations (2210, 2220) and signaling between base stations (2210, 2220) and a central processor (2240) may be performed. The second base station (2220) may perform beamforming to increase the throughput of cooperative communication terminals (2230) in a shadow area through the RIS (2250). Therefore, when cooperative communication is performed, the RIS (2250) may be controlled for beamforming for cooperative communication terminals (2230) of a serving cell. To optimize beamforming, a discrete phase shift matrix of the RIS (2250) may be determined. Here, the phase shift matrix refers to a matrix including discrete phase shift values ​​applied according to passive elements constituting the RIS (2250). The second base station (2220) can control the active RIS based on the phase shift matrix. The central processor (2240) can determine the phase shift matrix of the RIS (2250) for optimized transmission rate division and beamforming, and transmit the optimized transmission rate division and the RIS (2250) phase shift matrix to the base stations (2210, 2220) in charge of each cell. The second base station (2220) can control the RIS (2250) based on the phase shift matrix received from the central processor (2240), thereby forming an optimized beamforming by the central processor (2240).

[0227] In order to perform cooperative communication, the first base station (2210) in charge of the serving cell can manage a list of cooperative communication candidate cells based on at least one of channel state information (CSI), channel state stability, SINR, etc. In a downlink RSMA communication environment, the list of cooperative communication candidate cells can be determined based on best effort rate-splitting. In a downlink RSMA-based communication environment, communication resources can be distributed based on rate splitting so that the maximum sum rate of user terminals of the corresponding cell can be achieved. For example, when the throughput is reduced due to a decrease in the SINR of a cooperative communication terminal (2230), the central processor (2240) can improve the SINR by increasing the common message rate. The central processor (2240) determines the common message rate so as to achieve the maximum sum rate, and transmits common messages and / or private messages generated based on the common message rate to the base stations (2210, 2220). Here, the total achievable rate for the cooperative communication terminal (2230) can be defined as in [Mathematical Formula 10] below.

[0228]

[0229] In [Equation 10], means the common message transmission rate for the kth terminal, and for the kth terminal, refers to the personal message delivery rate.

[0230] The RSMA technique can improve the SINR experienced by users by increasing the rate of common messages, but the transmission rate for each terminal may decrease. Therefore, it is desirable to consider the minimum achievable transmission rate for each terminal in the cell. For example, the sum transmission rate of common messages is the minimum achievable transmission rate for each terminal. Constraints to be less than or equal to (i.e., ) can be set. If the performance deterioration occurs to the extent that the constraints cannot be guaranteed, the central processor (2240) can improve the communication performance through cooperative communication. If the constraints are not guaranteed, the central processor (2240) can include the cooperative communication terminal (2230), which is the corresponding user, in the candidate list for cooperative communication and perform signaling with the second base station (2220) that provides a cooperative cell capable of cooperation. Therefore, the central processor (2240) can perform optimization based on the problem of finding the maximum sum rate of each user transmission rate as in [Mathematical Formula 11] below, and can determine whether to perform cooperative communication based on whether the constraints are satisfied.

[0231]

[0232] In [Equation 11], means the common message ratio, stands for beamforming vector, means the transmission power factor, means the total power factor threshold, means the minimum required transmission rate of the kth terminal.

[0233] FIG. 23 illustrates an example of a procedure for a terminal to receive data based on cooperative communication according to an embodiment of the present disclosure. In FIG. 23 , it is assumed that a first base station and a second base station can perform cooperative communication, and the first base station manages a serving cell and the second base station manages a cooperative cell. It is also assumed that the second base station operates RIS. In FIG. 23 , a terminal refers to a cooperative communication terminal that does not satisfy a specific condition in a rate division multiple access system in a communication environment via a serving cell. Here, the specific condition may be a requirement for a cooperative communication terminal in a communication system, and may mean a case where the sum transmission rate of common messages is less than the minimum achievable transmission rate of the cooperative communication terminal, as in the constraint condition of [Mathematical Formula 11]. In other words, if it is difficult to satisfy the communication requirement with the serving cell alone, a cooperative communication procedure for the cooperative communication terminal may be performed.

[0234] Referring to FIG. 23, in step S2301, the terminal performs an initial connection procedure. The terminal may perform the initial connection procedure with the first base station and / or the second base station and establish a connection with the first base station and / or the second base station. For convenience of explanation, the initial connection procedure between the terminal and the first base station is described, but the same method may also be used for the initial connection procedure between the terminal and the second base station. To perform the initial connection procedure, the terminal may receive system information from the first base station. The system information may be transmitted via a master information block (MIB) and a system information block (SIB). The terminal performs the initial connection procedure with the first base station based on the received system information. To perform the initial connection procedure, the terminal may perform at least one of the operations described in FIG. 11. For example, the terminal may transmit a signal for initial connection (e.g., a random access preamble) to the base station based on the system information, and receive a response signal to the signal for initial connection from the base station.

[0235] In step S2303, the terminal performs a channel measurement procedure. To perform the channel measurement procedure, the terminal may first receive configuration information regarding channel measurement. The configuration information regarding channel measurement may include configuration information for measuring a channel related to an RIS controlled by a second base station. Accordingly, the terminal may measure an RIS channel for performing cooperative communication based on the configuration information regarding channel measurement. For example, the terminal may receive a reference signal from the second base station through the RIS, and report the channel measurement result to the second base station based on the measurement result of the received reference signal. The measurement result may be used to determine the common message ratio of the first data signal, the common message ratio of the second data signal, or the coefficient of the passive component of the RIS, and the specific procedure will be described later in FIG. 26.

[0236] In step S2305, the terminal receives a first data signal from the first base station. The first data signal may be generated based on the RSMA technique. For example, the first data signal may be composed of an integrated common message and at least one private message, having a structure similar to FIG. 16. Here, the integrated common message refers to a message in which common messages for all terminals connected to the first base station are combined. Since the private message for the cooperative communication terminal may be transmitted via the second base station, the private message for the cooperative communication terminal may not be included in the first data signal. For example, the first data signal may include private messages for other terminals connected to the first base station, excluding the cooperative communication terminal. This may improve the SINR of other terminals.

[0237] In step S2307, the terminal receives a second data signal from the second base station via RIS. The second data signal, like the first data signal, may be generated based on the RSMA technique. For example, the second data signal may be composed of an integrated common message and at least one private message, similar to the structure shown in FIG. 16. Here, the integrated common message refers to a message that combines common messages for all terminals connected to the second base station. The second data signal may include both a private message for the terminal and private messages for terminals connected to the second base station.

[0238] In step S2309, the terminal obtains the common message included in the first data signal and the private message included in the second data signal. Since the integrated common message included in the first data signal can be decoded by both the terminal and other terminals connected to the first base station, the first terminal can obtain the integrated common message included in the first data signal and separate its own common message from the obtained integrated common message. In addition, the terminal can obtain the private message for the terminal by decoding the integrated common message included in the second data signal and decoding a common message removal signal that removes a signal corresponding to the integrated common message from the second data signal. The terminal can obtain the entire message for the terminal by combining its own common message and private message.

[0239] As described with reference to Figure 23, cooperative communication can be performed based on the RSMA technique. To utilize the RSMA technique, the determination and signaling of configuration information between the base station and the terminal are required. Here, to perform cooperative communication using the RSMA technique, the configuration information (e.g., the common message rate of the first data signal, the common message rate of the second data signal, or the coefficients of the passive elements of the RIS) can be determined by the base station or by a network node other than the base station.

[0240] Figure 24 illustrates an example of a procedure for transmitting a data signal based on cooperative communication by a first base station according to one embodiment of the present disclosure. In Figure 24, it is assumed that the terminal is communicating via the serving cell of the first base station. Furthermore, when the first and second base stations perform cooperative communication, it is assumed that the first base station manages the serving cell and first obtains information on at least one cooperatively available cell. Furthermore, it is assumed that the second base station manages the cooperative cell and operates RIS.

[0241] Referring to FIG. 24, at step S2401, the first base station performs an initial connection procedure. To perform the initial connection procedure with the terminal, the first base station may transmit system information, receive a signal for initial connection (e.g., a random access preamble) from the terminal, and transmit a response signal to the signal for initial connection to the terminal.

[0242] In step S2403, the first base station performs a channel measurement procedure. The channel measurement procedure may be triggered when cooperative communication is determined to be necessary for a specific terminal. For cooperative communication, an RIS controlled by a second base station may be utilized, and optimization of parameter values ​​related to the RIS is required. To determine parameter values ​​related to the RIS, a measurement procedure related to the RIS channel may be performed. Here, the RIS channel refers to a channel including a channel between the terminal and the RIS and a channel between the RIS and the second base station. The RIS channel may be measured through signaling between the terminal and the second base station, and the first base station may receive information related to the RIS channel from the second base station. To this end, the first base station may allocate resources for the terminal to perform measurement by transmitting configuration information related to channel measurement to the terminal. In addition, the first base station may request RIS channel measurement by transmitting a channel measurement request message to the second base station.

[0243] In step S2405, the first base station determines configuration information for cooperative communication. Since cooperative communication can be performed based on the RSMA technique, the configuration information for cooperative communication can include the common message rate of the first data signal, the common message rate of the second data signal, or the coefficient of the passive element of the RIS. The configuration information for cooperative communication can be determined based on the RIS channel measurement results, and the first base station can transmit some of the determined configuration information for cooperative communication (e.g., the common message rate of the second data signal, the coefficient of the passive element of the RIS) to the second base station. A specific method will be described later in FIG. 26.

[0244] In step S2407, the first base station transmits a private message to the second base station. In step S2405, the first base station may separate the entire message to be transmitted to the terminal into a common message and a private message based on the cooperative communication configuration information. Here, the common message is included in the integrated common message included in the first data signal, and the private message is included in the second data signal transmitted via the second base station.

[0245] In step S2409, the first base station transmits a first data signal containing a common message to the terminal. The terminal decodes the integrated common message included in the first data signal and segments the integrated common message to obtain a common message for the terminal. The common message for the terminal may be combined with a private message transmitted by the second base station to form a complete message.

[0246] FIG. 25 illustrates an example of a procedure for a network node to transmit a data signal based on cooperative communication according to one embodiment of the present disclosure. In FIG. 25, as in FIG. 24, it is assumed that a terminal is performing communication via a serving cell of a first base station. Furthermore, when the first and second base stations perform cooperative communication, it is assumed that the first base station manages the serving cell, the second base station manages the cooperative cell, and the second base station operates RIS. Referring to FIG. 25, the network node can control the first and second base stations to perform cooperative communication. It is assumed that the network nodes share a list of cooperative cells capable of performing cooperative communication.

[0247] Referring to FIG. 25, in step S2501, the network node receives an RSMA reconfiguration request signal from the first base station. The RSMA reconfiguration request message may be transmitted to request rate division optimization when the channel environment related to the first base station changes. The network node attempts to optimize parameters related to RSMA based on the RSMA reconfiguration request signal. At this time, if cooperative communication is required, the network node decides to perform a channel measurement procedure. Here, the need for cooperative communication may mean that the requirements for a terminal in communication using the first base station are not satisfied, and thus a cooperative cell of the second base station is required.

[0248] In step S2503, the network node performs a channel measurement procedure. Cooperative communication can be performed using the RIS controlled by the second base station, and optimization of parameter values ​​related to the RIS is necessary for efficient communication. To determine the parameter values ​​related to the RIS, a measurement procedure related to the RIS channel can be performed. Accordingly, the network node can request the first base station and the second base station to measure the RIS channel. Since the RIS channel can be measured through signaling from the terminal and the second base station, the network node can allocate resources for channel measurement to the terminal through the first base station.

[0249] In step S2505, the network node determines configuration information regarding cooperative communication. Since cooperative communication can be performed based on the RSMA technique, the configuration information regarding cooperative communication can include the common message rate of the first data signal, the common message rate of the second data signal, or the coefficient of the passive element of the RIS. The configuration information regarding cooperative communication can be determined based on the RIS channel measurement results. The network node can generate a message to be transmitted to the terminal based on the configuration information regarding cooperative communication, and can transmit information regarding the coefficient of the determined RIS passive element to the second base station.

[0250] In step S2507, the network node transmits a first RSMA message to the first base station. The first RSMA message may be generated based on configuration information regarding cooperative communication. When performing cooperative communication, the network node may separately transmit common messages and private messages for specific terminals to the first base station and the second base station. Therefore, the first RSMA message may include only private messages from other terminals, excluding the private message for the cooperative communication terminal that is the target of cooperative communication. Since the private message of one terminal acts as a noise signal to other terminals, the SINR of the first RSMA message may be improved compared to when the private message of the cooperative communication terminal is included.

[0251] At step S2509, the network node transmits a second RSMA message to the second base station. The second RSMA message may include a private message for the cooperative communication terminal. Accordingly, the second RSMA message may include a common message for terminals connected to the second base station, private messages for terminals connected to the second base station, and a private message for the cooperative communication terminal.

[0252] In Figure 25, a network node transmits a first RSMA message and a second RSMA message to each base station, and the first and second base stations transmit data signals to cooperative communication terminals. The terminals can receive the entire message by decoding the data signals transmitted by the two first base stations and the data signals transmitted by the second base station.

[0253] In Figure 25, a network node refers to a device capable of controlling a base station, but may be referred to by other terms and is not limited to a specific term. For example, it may be referred to as a central processor, central control unit, network processor, network device, core network, or other terms with equivalent technical meaning.

[0254] For convenience of explanation, below, it is assumed that the first base station manages the serving cell and the second base station manages the cooperative cell. Furthermore, among the terminals included in the serving cell, those that receive data signals from the first and second base stations through cooperative communication are defined as cooperative communication terminals. Using the procedures described in FIGS. 23 to 25, the cooperative communication terminal can obtain the entire message by combining the two messages received from the first and second base stations. Below, a specific procedure for determining cooperative communication configuration information for efficient RSMA communication is described. The cooperative communication configuration information may include the following parameters.

[0255] - The common message ratio of the data signal transmitted by each base station to transmit an efficient RSMA signal.

[0256] - Passive element counting for controlling RIS that can be controlled by the second base station

[0257] - Beamforming coefficients corresponding to the passive element coefficients of RIS

[0258] FIG. 26 illustrates an example of a procedure for a control device to determine configuration information related to cooperative communication according to an embodiment of the present disclosure. The configuration information related to cooperative communication can be optimized based on channel conditions, and the channel conditions required for optimization are assumed to have been measured. The control device refers to a device that determines parameters related to cooperative communication, and may refer to a base station or a network node. The configuration information related to cooperative communication can be determined by a base station, as in step S2405 of FIG. 24, or by a network node, as in step S2505 of FIG. 25, using the procedures described in FIG. 26.

[0259] In step S2601, the control device determines parameters related to the first base station based on the transmission rate of the first base station. The parameters related to the first base station may include beamforming and a common message rate. The control device may aim to improve the throughput of the serving cell by reducing the SINR of the serving cell through rate split-based optimization. Accordingly, the control device may define an objective function related to the throughput of the serving cell and determine parameters related to the first base station so that the objective function related to the throughput of the serving cell is maximized.

[0260] In step S2603, the control device determines parameters related to the second base station based on the transmission rate of the second base station. The parameters related to the second base station may include a common message rate, a beamforming vector, and RIS passive component coefficients. Optimizing the RIS beamforming of the cooperative cell can minimize the impact of cooperative communication on the cooperative cell. Accordingly, the control device can define an objective function regarding the throughput of the cooperative cell and determine parameters related to the second base station so that the objective function regarding the throughput of the cooperative cell is maximized.

[0261] Below, the specific procedure for determining parameters related to the first base station and parameters related to the second base station is described. For convenience of explanation, the beamforming vector , in RSMA technique, the common rate allocation parameter is , RIS precoding matrix is defined as , and the cooperative communication terminal is defined as the kth terminal. The transmission rate for the kth terminal can be expressed as in [Mathematical Formula 12] below.

[0262]

[0263] In [Equation 13], is the common message transmission rate for the kth terminal, represents the private message transmission rate for the kth terminal.

[0264] Sum of common message transmission rates for K terminals can be expressed as in [Mathematical Formula 13] below.

[0265]

[0266] In [Equation 13], means the common message transmission rate for the i-th terminal.

[0267] The control device determines the common message ratio based on the objective function expressed in [Mathematical Formula 14] below. and beamforming vector can be decided.

[0268]

[0269] In [Mathematical Formula 14], I represents the index set of terminals belonging to the first base station, means the common message transmission rate of the i-th terminal of the first base station, means the transmission rate of the private message of the i-th terminal of the first base station, and the first base station means the transmission rate threshold of the i-th terminal.

[0270] As in [Mathematical Formula 14], cooperative communication configuration information can be determined so that the transmission rate of the serving cell of the first base station is maximized. In other words, the beamforming vector of the first base station and the common message rate of the first base station can be determined so that the sum of the transmission rates of the integrated common message and the transmission rates of the remaining private messages excluding the private message for the kth terminal is maximized. [Mathematical Formula 14] can be solved using the Sequential Convex Approximation (SCA) technique.

[0271] The control device determines the common message ratio based on the objective function based on the following [Mathematical Formula 15] , beamforming vector and a RIS precoding matrix containing information about the passive element coefficients of the RIS. can be determined. The RIS precoding matrix can be referred to as a phase shift matrix.

[0272]

[0273] In [Mathematical Formula 15], I represents the index set of terminals belonging to the second base station, means the transmission rate of the common message of the i-th terminal of the second base station, means the transmission rate of the private message of the i-th terminal of the second base station, refers to the personal message transmission rate of the kth terminal, which is a cooperative communication terminal, means the transmission rate threshold of the ith terminal of the second base station.

[0274] As in [Mathematical Formula 15], the setting information for cooperative communication can be determined so that the transmission rate of the cooperative cell of the second base station is maximized. That is, the common message rate is determined based on the transmission rate for the integrated common message, the sum of the transmission rates of the individual messages, and the individual message transmission rate for the kth terminal. , beamforming vector and RIS precoding matrix can be determined. Optimization for cooperative cells using [Mathematical Formula 15] can be solved through the BCD (block coordinate descent) technique. In addition, optimization of cooperative cells can be achieved by obtaining an optimal transmission rate division ratio and RIS precoding matrix through a technique in which transmission rate division optimization and RIS precoding optimization are alternately and repeatedly performed.

[0275]

[0276] Fig. 27 illustrates an example of a procedure in which a control device performs measurement according to an embodiment of the present disclosure. In Fig. 27, the control device, similar to Fig. 26, refers to a device that determines parameters related to cooperative communication, and may refer to a base station or a network node. In Fig. 27, the control device may measure a channel between a terminal connected to a first base station and a serving cell and a second base station, in order to optimize cooperative communication between the first base station and the second base station. It is assumed that the first base station operates a serving cell and the second base station operates a cooperative cell. Steps S2403 and S2503 of Fig. 24 may be performed through a method in which at least one of the steps of Fig. 27 is combined and / or merged.

[0277] Referring to Figure 27, at step S2701, the control device determines measurement resources. These measurement resources can be used for channel measurement procedures of cooperative cells. Since the terminal is connected to the first base station, a measurement gap technique can be used to measure the channel status with another base station, the second base station. Accordingly, the control device can allocate measurement resources related to the measurement gap. Furthermore, if the second base station uses RIS, measurement resources that take RIS optimization into account can be allocated. A specific resource allocation method will be described later in Figure 28.

[0278] In step S2703, the control device transmits information about measurement resources to the terminal. If the control device is a network node, the information about the measurement resources may be transmitted to the terminal via the first base station. The information about the measurement resources may include at least one of information about the measurement period, which is a parameter regarding the measurement gap, information about the measurement section, and information about the measurement target. If the number of possible phase shifts of the RIS is R, the information about the measurement resources may include information indicating the number of measurement repetitions so that the RIS channel measurement is repeated R times.

[0279] In step S2705, the control device requests the second base station to change the RIS phase. The second base station, which has received the RIS phase change request, changes the passive elements of the RIS to measure the RIS channel. Information about RIS passive element coefficients may be transmitted to the second base station to apply the RIS phase shift. The information about RIS passive element coefficients may be transmitted using a phase shift matrix (or vector) including the RIS passive element coefficients. For example, the information about RIS passive element coefficients may include values ​​of each element of the phase shift matrix or include index values ​​using a table regarding phase shift matrices.

[0280] In step S2707, the control device receives a channel measurement result. The channel measurement result may be generated through a channel measurement procedure between the terminal and the second base station. The channel measurement procedure may be repeated as many times as the number of reflection patterns (or the number of phase shift matrices for controlling the RIS) that the RIS can change through manual element control. The control device may receive the channel measurement result from the second base station.

[0281] If the number of passive elements constituting the RIS is N, and each passive element is an RIS with M different phase values, the total number of cases in which the phase transition matrix can be expressed is Mn It can be. However, it may be difficult to achieve the target reflection amplitude and phase shift of RIS with only one passive element. Therefore, a method of using a combination of multiple RIS passive elements through appropriate allocation of RIS passive elements is required. In this case, the type of passive element coefficient (or reflection pattern) that can be changed for each RIS is M n This number may be smaller than the number of RISs. Since this may vary depending on the communication environment and requirements, the control device can obtain information about the passive element count in advance. Therefore, the control device needs to understand the RIS information operated by the cooperative cell through communication with the cooperative cell, for example.

[0282] FIG. 28 illustrates an example of a resource allocation structure for measuring an RIS channel according to one embodiment of the present disclosure. In FIG. 28, a measurement gap technique can be applied to measure the RIS channel, and it is assumed that there are R types of RIS passive element coefficients capable of changing the reflection pattern that can control the RIS.

[0283] As shown in Fig. 28, the control device measures the channel time of the terminal. Considering the RIS phase transition period, can be set to maintain the channel measurement time. The base station sets the transition period to the channel measurement time. Resources are allocated so that they can include , and the terminal measures the RIS channel at the channel measurement time according to the measurement gap setting. This measurement is repeated R times, and RIS channels corresponding to the reflection patterns of the RIS can be measured. The base station operating the cooperative cell must control the RIS so that the RIS phase shift can be applied when the terminal measures the corresponding frequency channel. Scheduling for the terminal and RIS can be determined in the control device, and the control device transmits information about the determined scheduling to the serving cell and the cooperative cell.

[0284] FIG. 29 illustrates an example of a message structure used for cooperative communication according to one embodiment of the present disclosure. In FIG. 29, it is assumed that the serving cell is served by a first base station (2910), and the cooperative cell is served by a second base station (2920).

[0285] The first base station (2910) transmits only a common message to the cooperative communication terminal (2930). The first base station (2910) generates an integrated common message by combining common messages regarding terminals connected to the first base station (2910) to form an RSMA signal, and generates private messages regarding the remaining terminals except for the cooperative communication terminal (2930). The first base station (2910) transmits a first RSMA signal including the common message and private messages regarding the terminals connected to the first base station (2910) to the cooperative communication terminal (2930). At this time, the private message regarding the cooperative communication terminal (2930) is excluded. The cooperative communication terminal (2930) can decode only the integrated common message included in the first RSMA signal and regard the remaining private messages as interference.

[0286] The second base station (2920) transmits a private message to the cooperative communication terminal (2930). The second base station (2920) generates an integrated common message by combining common messages about terminals connected to the second base station (2920) to form an RSMA signal, and generates private messages about the terminals. The second base station (2920) transmits a second RSMA signal to the cooperative communication terminal (2930) that includes not only the common message and private messages about the terminals connected to the second base station (2920), but also the private message of the cooperative communication terminal (2930). The cooperative communication terminal (2930) first decodes the integrated common message included in the second RSMA signal, and can obtain a signal from which the integrated common message has been removed through sequential interference cancellation. Thereafter, the cooperative communication terminal (2930) can regard private messages for other terminals as interference based on the signal from which the common message has been removed, and can obtain the private message of the cooperative communication terminal (2930).

[0287] Afterwards, the cooperative communication terminal (2930) can obtain the entire message sent to itself by combining the common message and the private message for the cooperative communication terminal (2930). If the common message is a combination of common messages for multiple terminals, the cooperative communication terminal (2930) can perform a procedure to separate its common message from the common message and then combine its common message and private message.

[0288] FIG. 30 illustrates an example of signaling for performing cooperative communication controlled by a central processor (3040) according to one embodiment of the present disclosure. In FIG. 30, the central processor (3040) may refer to a function of an upper layer capable of controlling a first base station (3010) and a second base station (3020), and may be referred to as a network node, a network device, a network function, etc., and is not limited to a specific name. In a mobile communication environment where the central processor (3040) exists, resource allocation of each base station may be performed by the central processor (3040). When resource allocation is performed by the central processor (3040), there is an advantage in that complex optimization calculations can be efficiently performed. In a downlink RSMA-based mobile communication environment, the central processor (3040) may perform resource allocation that satisfies the maximum sum transmission rate by performing rate division-based optimization.

[0289] Referring to FIG. 30, in step S3001, the central processor (3040), the first base station (3010), and the second base station (3020) share a list of cooperative cells. The central processor (3040) manages each adjacent base station or cell and can share a list of cooperative cells that can cooperate with each base station. Furthermore, the central processor (3040) can obtain information regarding the RIS operated by the second base station (3020) in advance.

[0290] In step S3003, the first base station (3010) detects a deterioration in the communication condition. The first base station (3010) can detect that the communication condition has deteriorated when the throughput or SINR is lower than a specific threshold value.

[0291] In step S3005, the first base station (3010) transmits an RSMA reset request message. The RSMA reset request message may include information regarding the communication status, and through the RSMA reset request message, the first base station (3010) may request the central processor (3040) to perform optimization based on transmission rate division.

[0292] In step S3007, the central processor (3040) determines whether to perform cooperative communication. Upon receiving the RSMA reset request message, the central processor (3040) may first consider optimization by increasing the common message rate. However, it is preferable that the determination of the common message rate considers the minimum achievable transmission rate for each terminal within the cell, as in [Mathematical Formula 11]. If the condition regarding the minimum achievable transmission rate for each terminal is not satisfied through the optimization procedure, the central processor (3040) may decide to perform cooperative communication. Accordingly, the central processor (3040) may select a communication terminal and a second base station (3020) to perform cooperative communication. The central processor (3040) may determine measurement resources for optimizing cooperative communication.

[0293] In step S3009, the central processor (3040) transfers channel measurement resources to the first base station (3010). The channel measurement resources may be determined by the central processor (3040) for channel measurement between the second base station (3020) and the terminal. The channel measurement resources may be determined to be capable of measuring multiple RIS channels. For example, the channel measurement resources may be determined to be repeated as many times as the number of changeable passive element coefficients (e.g., the number of discrete phase shift matrices) of the RIS operated by the second base station (3020).

[0294] In step S3011, the first base station (3010) allocates channel measurement resources to the terminal. Channel measurement resource allocation may be determined based on a measurement gap technique, similar to step S2701 of FIG. 27, and measurement resources may be allocated considering RIS optimization.

[0295] In step S3013, the central processor (3040) requests the second base station (3020) to perform channel measurement for the terminal. The second base station (3020) may not only request channel measurement for the terminal, but also transmit information regarding measurement resources. For example, the central processor (3040) may transmit information regarding resources for the second base station (3020) to transmit a reference signal or passive element coefficients for controlling the RIS. In this case, information regarding the passive element coefficients may be transmitted as index values ​​using a table defining specific reflection patterns.

[0296] In step S3015, the second base station (3020) performs a channel measurement procedure with the terminal. The second base station (3020) may perform the channel measurement procedure with the terminal using the channel measurement resources determined by the central processor (3040). For example, the second base station (3020) may control the RIS based on the passive component coefficients of the RIS and transmit a reference signal through the RIS. The terminal may measure the RIS channel based on the received signal and report the measurement results to the second base station (3020).

[0297] In step S3017, the second base station (3020) transmits a channel measurement result report message to the central processor (3040). The channel measurement procedure may be performed for each reflection pattern or phase shift matrix of the RIS, and the second base station (3020) may transmit a result of synthesizing the measurement results to the central processor (3040). For example, the channel measurement result report message may include at least one of the frequency responses of RIS channels corresponding to each of the reflection patterns or phase shift matrices of the RIS.

[0298] In step S3019, the central processor (3040) determines configuration information for cooperative communication based on the channel measurement results. The configuration information for cooperative communication may include a common message rate of the first base station (3010) for generating an RSMA message, a common message rate of the second base station (3020), a beamforming vector of the first base station (3010), a beamforming vector of the second base station (3020), and RIS passive component coefficients controlled by the second base station (3020). The optimization procedure may be performed by a combination of the procedures disclosed in FIG. 26. For example, parameters for the common message rate and the RIS passive component coefficients may be performed such that an objective function for a transmission rate of each base station is defined and the objective function for the transmission rate is maximized.

[0299] In step S3021, the central processor (3040) transmits an RSMA message for the first base station (3010). The RSMA message for the first base station (3010) may be determined based on the common message ratio of the first base station (3010) determined in step S3019. The RSMA message for the first base station (3010) may include private messages for other terminals, excluding the private message of the terminal that will perform cooperative communication.

[0300] In step S3023, the central processor (3040) transmits an RSMA message for the second base station (3020). The RSMA message for the second base station (3020) may be determined based on the common message ratio of the second base station (3020) determined in step S3019. The RSMA message for the second base station (3020) may include messages regarding terminals connected to the second base station (3020) as well as personal messages of terminals that will perform cooperative communication.

[0301] Although not shown in FIG. 30, the terminal can then obtain the entire message by decoding a common message based on a data signal received from the first base station (3010) through cooperative communication and decoding a private message based on a data signal received from the second base station (3020).

[0302] FIG. 31 illustrates an example of signaling for performing cooperative communication controlled by a first base station (3110) according to an embodiment of the present disclosure. In a mobile communication environment without a central processor, resource allocation for each base station is performed at the base station. This communication environment has the advantage that delays due to backhaul communication, etc. do not occur because optimization calculations are performed at the base station. Referring to FIG. 31, in a downlink RSMA-based mobile communication environment, the first base station (3110) can perform resource allocation so that the sum transmission rate is maximized by performing rate division-based optimization. In FIG. 31, communication between base stations can be performed via an X2 interface or an Xn interface.

[0303] Referring to FIG. 31, in step S3101, the first base station (3110) and the second base station (3120) share a list of cooperative cells. A procedure for exchanging information between the first base station (3110) and the second base station (3120) may be performed first. The procedure for exchanging the list of cooperative cells between the first base station (3110) and the second base station (3120) may be performed in various ways and is not limited to a particular method. For example, the list of cooperative cells may be shared through an X2 or Xn interface, and cell-related information may be exchanged through a function that allows base stations to share their cell-related information with each other through a connection or backhaul connection, such as a self-organizing network (SON) or an automatically neighbor relation (ANR) function. As another example, the first base station (3110) may obtain the list of cooperative cells of the first base station (3120) through an Xn setup procedure with the first base station (3120). In the Xn setup procedure, the first base station (3110) can transmit an XN setup request message to the first base station (3120) and receive an XN setup response message from the first base station (3120) that includes cell information served by the first base station (3120).

[0304] In step S3103, the first base station (3110) detects a deterioration in the communication condition. The first base station (3110) can detect that the communication condition has deteriorated when the throughput or SINR is lower than a threshold value.

[0305] In step S3105, the first base station (3110) performs a setup procedure for cooperative communication. Unlike the central processor, the first base station (3110) does not know the status of the second base station (3120) and therefore cannot determine whether the second base station (3120) is capable of cooperative communication. Therefore, based on the setup procedure for cooperative communication, the first base station (3110) can confirm whether the second base station (3120) is capable of cooperative communication. Whether cooperative communication is possible can be determined based on the minimum achievable transmission rate. Step S3105 can be performed as a combination and / or merged procedure of the steps of FIG. 32, which will be described later.

[0306] In step S3107, the first base station (3110) transmits channel measurement resource information to the terminal (3130). The channel measurement resource may be determined by the first base station (3110) for channel measurement between the second base station (3120) and the terminal (3130). The channel measurement resource may be determined to be capable of measuring multiple RIS channels. For example, the channel measurement resource may be determined to be repeated as many times as the number of changeable reflection patterns (or phase shift matrices) of the RIS operated by the second base station (3120).

[0307] In step S3109, the first base station (3110) transmits a channel measurement request message to the second base station (3120). The channel measurement request message may include information about measurement resources.

[0308] In step S3111, the second base station (3120) and the terminal (3130) perform channel measurement. The second base station (3120) can perform a channel measurement procedure with the terminal (3130) using information about the received measurement resources. For example, the second base station (3120) can control the RIS based on the passive element coefficients included in the phase shift matrix and transmit a reference signal through the RIS. The terminal (3130) can measure the RIS channel based on the received signal and report the measurement result to the second base station (3120).

[0309] In step S3113, the second base station (3120) transmits a channel measurement result report message to the first base station (3110). The channel measurement procedure may be repeatedly performed for each reflection pattern (or phase shift matrix) of the RIS, and the second base station (3120) may transmit a result of synthesizing the measurement results to the first base station (3110). For example, the channel measurement result report message may include frequency responses of RIS channels corresponding to each of the reflection patterns or phase shift matrices of the RIS.

[0310] In step S3115, the first base station (3110) determines configuration information regarding cooperative communication based on the measurement result. The configuration information regarding cooperative communication may include a common message rate of the first base station (3110) for generating an RSMA message, a common message rate of the second base station (3120), a beamforming vector of the first base station (3110), a beamforming vector of the second base station (3120), and RIS passive component coefficients controlled by the second base station (3120). The optimization procedure may be performed by a combination of the procedures disclosed in FIG. 26. For example, parameters regarding the common message rate and RIS passive component coefficients may be performed such that an objective function regarding a transmission rate of each base station is defined and the objective function regarding the transmission rate is maximized.

[0311] In step S3117, the first base station (3110) transmits an RSMA message for the second base station (3120). The RSMA message for the second base station (3120) may include information regarding a private message for the terminal (3130).

[0312] In step S3119, the first base station (3110), the second base station (3120), and the terminal (3130) perform cooperative communication. The cooperative communication may utilize the message structure described in FIG. 29. That is, the first base station (3110) transmits a first data signal including a unified common message and private messages for other terminals excluding the private message of the terminal (3130). The second base station (3120) transmits a second data signal including a common message, private messages for other terminals, and a private message for the terminal (3130).

[0313] Although not shown in FIG. 31, the terminal (3130) can then obtain the entire message by decoding the common message based on the data signal received from the first base station (3110) and decoding the individual message based on the data signal received from the second base station (3120).

[0314] When the central processor performs optimization for cooperative communications, it understands the communication environment or status of the cooperative cell. However, when the base station performs optimization for cooperative communications, it must verify whether cooperative communications are possible through inter-base station signaling. The following describes the setup procedure for cooperative communications.

[0315] FIG. 32 illustrates an example of signaling for determining whether cooperative communication is to be performed between base stations (3210, 3220-1, and 2320-2) according to one embodiment of the present disclosure. In FIG. 32 , it is assumed that the first base station (3210) is connected to the terminal via a serving cell and shares a list of cooperative cells with the second base station (3220-1) and the third base station (3220-2).

[0316] In step S3201, the first base station (3210) transmits a cooperative communication request message to the third base station (3220-2). The cooperative communication request message may include information that can determine whether cooperative communication is possible based on the RSMA technique. For example, the first base station (3210) may include information regarding a personal message to be transmitted to another base station via cooperative communication. The information regarding the personal message may be conveyed using metadata. The metadata may include information regarding at least one of the attributes, structure, size, and name of the personal message.

[0317] In step S3203, the third base station (3220-2) determines that the cooperative communication conditions are not satisfied. The third base station (3220-2) can perform a rate division-based optimization based on the information about the private message transmitted by the first base station (3210). The optimization can be performed so that the sum transmission rate is maximized as an objective function, as in [Mathematical Formula 11]. If the optimization cannot be performed due to a specific constraint, the third base station (3220-2) determines that cooperative communication is not possible. For example, if the constraint of [Mathematical Formula 11] that the sum transmission rate of the common messages must be less than or equal to the minimum achievable transmission rate for the terminals is not satisfied, the third base station (3220-2) can determine that cooperative communication is not possible.

[0318] In step S3205, the third base station (3220-2) transmits a cooperative communication request rejection message to the first base station (3210). The first base station (3210), which receives the cooperative communication request rejection message, searches for other base stations.

[0319] In step S3207, the first base station (3210) transmits a cooperative communication request message to the second base station (3220-1). Similar to step S3201, the cooperative communication request message may include information that can determine whether cooperative communication is possible based on the RSMA technique.

[0320] At step S3209, the second base station (3220-1) determines that the cooperative communication conditions are satisfied. The second base station (3220-1) can perform rate division-based optimization based on information regarding the private message transmitted by the first base station (3210). The second base station (3220-1) can determine that rate division optimization is possible based on the minimum achievable transmission rate.

[0321] In step S3311, the second base station (3220-1) transmits a cooperative communication confirmation acceptance message to the first base station (3210). Upon receiving the cooperative communication confirmation acceptance message, the first base station (3210) may then request the second base station (3220-1) to perform a channel measurement procedure for cooperative communication.

[0322] When common and private messages are transmitted through the serving cell and cooperative cell, respectively, using the RSMA technique, the terminal needs a procedure to verify whether the data was received based on the optimization of cooperative communication or through proper scheduling. Data packets contain indicators, such as sequence numbers, which can be used to determine whether the data was delivered in the correct order. If data is delivered incorrectly, retransmission can be requested using a negative acknowledgment (NACK) or hybrid automatic repeat and request (HARQ). The present disclosure proposes a method for generating metadata for private messages and including it in a common message.

[0323] Figure 33 illustrates an example of a procedure for a terminal to verify a personal message according to one embodiment of the present disclosure. It is assumed that prior to performing the procedure of Figure 33, the cooperative communication terminal has received a first data signal including metadata from the first base station.

[0324] In step S3301, the cooperative communication terminal decodes the common message from the first data signal. The first data signal may include a unified common message and private messages. The cooperative communication terminal can separate the unified common message to obtain its own common message. Since the first data signal does not include the cooperative communication terminal's private message, the SINR of other terminals can be improved.

[0325] In step S3303, the cooperative communication terminal receives a second data signal from the second base station. The second data signal includes a unified common message for terminals connected to the second base station, private messages for terminals connected to the second base station, and a private message for the cooperative communication terminal. The second message is delivered to the cooperative communication terminal via an optimized RIS based on a channel measurement procedure.

[0326] In step S3305, the cooperative communication terminal decodes the private message from the second data signal. The cooperative communication terminal can decode its private message after removing the integrated common message using a sequential interference cancellation technique. Private messages are individually assigned to each terminal, and each terminal can only decode its own private message. The specific procedure for decoding private messages is described later in Figure 34.

[0327] In step S3307, the cooperative communication terminal obtains metadata regarding the private message based on the common message. As shown in Figure 35, the metadata may be included in the common message for the cooperative communication terminal. For example, the common message for the cooperative communication terminal may include an indicator, a payload, and metadata regarding the private message.

[0328] In step S3309, the cooperative communication terminal determines whether the private message has been successfully received based on metadata. The metadata may be generated based on at least one of a pre-agreed identifier, a cyclic redundancy check (CRC), protocol information, and channel information between the cooperative communication terminal and the first base station. The cooperative communication terminal determines whether the private message corresponding to the metadata has been received. If it has not been properly received, it performs step S3311. If it has been properly received, it performs step S3313.

[0329] For example, if metadata is generated based on RIS channel information, the cooperative communication terminal can determine that the private message reception is successful if the second message is received through the RIS channel identified through the metadata, and determine that the private message reception is unsuccessful if the second message is received through a different channel. This allows the cooperative communication terminal to verify that the data received from the second base station is correct and achieve accurate synchronization.

[0330] In step S3311, the cooperative communication terminal transmits a NACK to the first base station. If the cooperative communication terminal fails to receive the private message, it can request the first base station to retransmit the private message via the NACK. The first base station requests the second base station to retransmit the private message, and the second base station retransmits a signal containing the private message to the cooperative communication terminal. Thereafter, the terminal reattempts to receive the private message by performing the steps starting from step S3303.

[0331] In step S3313, the cooperative communication terminal combines the common message and the private message. By combining the common message and the private message using the combining unit, the cooperative communication terminal can obtain the entire message transmitted to itself.

[0332] The metadata included in the common message is not limited to a specific format and can be defined in any format that can be used by the terminal to determine whether the individual message received from the cooperative base station was transmitted correctly. A specific example of how the metadata is implemented is described below.

[0333] - When metadata is generated based on CRC: The first base station determines the CRC value added to the transmission block of the private message as metadata and transmits the common message to the cooperative communication terminal. The cooperative communication terminal determines that reception of the private message is successful if the received CRC value is identical to the CRC value of the private message received from the cooperative cell.

[0334] - When metadata includes parameters related to security and / or authentication: Parameters regarding a protocol for receiving a private message may be determined as metadata. For example, the common message may include information regarding at least one of a key value or an access stratum (AS) security algorithm used in a security and / or authentication procedure. The cooperative communication terminal may decrypt or verify the integrity of the private message based on at least one of the keys or AS security algorithms included in the common message.

[0335] - When channel information is used as metadata: The first base station uses information related to the RIS reflection pattern as metadata. For example, the first base station can optimize the RIS reflection pattern based on the measurement results between the cooperative communication terminal and the second base station, and can use information about the RIS channel corresponding to the optimized RIS reflection pattern for the cooperative communication terminal as metadata. In this case, the information about the RIS channel can be determined based on the RIS reflection pattern, the channel between the cooperative base station and the cooperative communication terminal, the channel between the cooperative base station and the RIS, the channel between the cooperative communication terminal and the RIS, and the precoding matrix of the optimized RIS reflection pattern.

[0336] For example, the RIS channel between the measured cooperative base station and the cooperative communication terminal for the optimization based on transmission rate division can be defined as in [Mathematical Formula 16] below.

[0337]

[0338] A signal received by a cooperative communication terminal from a cooperative base station using RIS can be expressed as in [Mathematical Formula 17] below.

[0339]

[0340] The cooperative communication terminal receives the signal The measurement results are transmitted to the serving base station through the cooperative base station. Since the serving base station knows the information about the RIS of the cooperative base station (e.g., the RIS precoding matrix), it can obtain the RIS channel information through the channel measurement result report received from the cooperative base station. The serving base station can generate metadata based on the obtained RIS channel information.

[0341] Successful reception of a private message can be determined by comparing the RIS channel included in the metadata with the channel of the signal received from the cooperative base station. For example, a cooperative communication terminal can estimate the channel environment of the received signal by measuring the DMRS (demodulation reference signal) of the signal received from the cooperative base station, and compare it with the RIS channel included in the metadata. Since the RIS of the cooperative base station is optimized exclusively for the cooperative communication terminal, the RIS channel included in the metadata does not correspond to the channels measured using DMRS by other terminals. Therefore, the security and independence of the cooperative communication terminal can be guaranteed.

[0342] Figure 34 illustrates an example of a procedure for a terminal to decode a personal message according to one embodiment of the present disclosure. In Figure 34, it is assumed that the cooperative communication terminal is connected to a first base station as a serving cell and to a second base station as a cooperative cell. In Figure 34, the second data signal refers to a signal generated by the second base station based on the RSMA technique.

[0343] In step S3401, the cooperative communication terminal decodes a common message based on a second data signal. The second data signal includes a unified common message for terminals connected to the second base station, a private message for terminals connected to the second base station, and a private message for the cooperative communication terminal. The unified common message included in the second data signal can be decoded not only by terminals connected to the second base station but also by the cooperative communication terminal. Information for decoding the unified common message may be provided to the cooperative communication terminal in advance.

[0344] In step S3403, the cooperative communication terminal obtains a common message removal signal by removing signals related to the integrated common message from the second data signal. The decoded integrated common message can be converted into a signal of the integrated common message portion included in the second data signal through re-encoding, precoding, and channel compensation. Thereafter, the cooperative communication terminal can obtain a common message removal signal based on the difference between the second data signal and the signal of the integrated common message portion.

[0345] In step S3405, the cooperative communication terminal decodes the private message based on the common message removal signal. The private message can then be merged with the private message for the cooperative communication terminal.

[0346] The methods proposed in this disclosure can improve the quality of experience (QoE) of user terminals by utilizing cooperative communication when a certain level of throughput cannot be guaranteed due to unstable communication in the serving cell. Signals for cooperative communication can utilize the RSMA technique, and rate division techniques can enhance communication efficiency. Furthermore, the serving cell can improve the SINR of user terminals by transmitting only common messages to users and not including private messages for cooperative communication terminals.

[0347] Because RIS optimization and the common message rate optimization of cooperative cells take into account the transmission rate of the cooperative cell, even when private messages for cooperative communication terminals are transmitted through the cooperative cell, the impact on existing users of the cooperative cell can be reduced. Cooperative communication terminals can verify private messages received from the cooperative cell, and this verification can be performed based on metadata in the common message. Therefore, unlike conventional cooperative communication, simultaneous signal transmission is not necessarily required, and the scheduling required for data verification can be omitted.

[0348] Below, examples of wireless device utilization to which various embodiments of the present disclosure are applied are described.

[0349] Figure 36 illustrates an example of a wireless device applicable to the present disclosure. The wireless device may be implemented in various forms depending on the use case / service (see Figure 1).

[0350] Referring to FIG. 36, the wireless device (200) corresponds to the wireless device (200) of FIG. 2 and may be composed of various elements, components, units / units, and / or modules. For example, the wireless device (200) may include a communication unit (210), a control unit (220), a memory unit (230), and additional elements (240). The communication unit may include a communication circuit (212) and a transceiver(s) (214). For example, the communication circuit (212) may include one or more processors (202) and / or one or more memories (204) of FIG. 2. For example, the transceiver(s) (214) may include one or more transceivers (206) and / or one or more antennas (208) of FIG. 2. The control unit (220) is electrically connected to the communication unit (210), the memory unit (230), and the additional elements (240) and controls the overall operations of the wireless device. For example, the control unit (220) can control the electrical / mechanical operations of the wireless device based on the program / code / command / information stored in the memory unit (230). In addition, the control unit (220) can transmit information stored in the memory unit (230) to an external device (e.g., another communication device) via a wireless / wired interface through the communication unit (210), or store information received from an external device (e.g., another communication device) via a wireless / wired interface in the memory unit (230).

[0351] The additional element (240) may be configured in various ways depending on the type of the wireless device. For example, the additional element (240) may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit. Although not limited thereto, the wireless device may be implemented in the form of a robot (Fig. 1, 100a), a vehicle (Fig. 1, 100b-1, 100b-2), an XR device (Fig. 1, 100c), a portable device (Fig. 1, 100d), a home appliance (Fig. 1, 100e), an IoT device (Fig. 1, 100f), a digital broadcasting terminal, a hologram device, a public safety device, an MTC device, a medical device, a fintech device (or a financial device), a security device, a climate / environmental device, an AI server / device (Fig. 1, 400), a base station (Fig. 1, 200), a network node, etc. Wireless devices may be mobile or stationary depending on the use / service.

[0352] In FIG. 36, various elements, components, units / parts, and / or modules within the wireless device (200) may be entirely interconnected via a wired interface, or at least some may be wirelessly connected via a communication unit (210). For example, within the wireless device (200), the control unit (220) and the communication unit (210) may be wired, and the control unit (220) and a first unit (e.g., 230, 240) may be wirelessly connected via the communication unit (210). In addition, each element, component, unit / part, and / or module within the wireless device (200) may further include one or more elements. For example, the control unit (220) may be composed of a set of one or more processors. For example, the control unit (220) may be composed of a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing processor, a memory control processor, etc. As another example, the memory unit (130) may be composed of RAM (Random Access Memory), DRAM (Dynamic RAM), ROM (Read Only Memory), flash memory, volatile memory, non-volatile memory, and / or a combination thereof.

[0353] Below, the implementation example of Fig. 36 is described in more detail with reference to the drawings.

[0354] Figure 37 illustrates examples of portable devices applicable to the present disclosure. Portable devices may include smartphones, smart pads, wearable devices (e.g., smartwatches, smartglasses), and portable computers (e.g., laptops, etc.). Portable devices may also be referred to as Mobile Stations (MS), User Terminals (UT), Mobile Subscriber Stations (MSS), Subscriber Stations (SS), Advanced Mobile Stations (AMS), or Wireless Terminals (WT).

[0355] Referring to FIG. 37, the portable device (200) may include an antenna unit (208), a communication unit (210), a control unit (220), a memory unit (230), a power supply unit (240a), an interface unit (240b), and an input / output unit (240c). The antenna unit (208) may be configured as a part of the communication unit (210). Blocks 210 to 230 / 240a to 240c of FIG. 37 correspond to blocks 210 to 230 / 240 of FIG. 36, respectively.

[0356] The communication unit (210) can transmit and receive signals (e.g., data, control signals, etc.) with other wireless devices and base stations. The control unit (220) can control components of the mobile device (200) to perform various operations. The control unit (220) can include an AP (Application Processor). The memory unit (230) can store data / parameters / programs / codes / commands required for operating the mobile device (200). In addition, the memory unit (230) can store input / output data / information, etc. The power supply unit (240a) supplies power to the mobile device (200) and can include a wired / wireless charging circuit, a battery, etc. The interface unit (240b) can support connection between the mobile device (200) and other external devices. The interface unit (240b) can include various ports (e.g., audio input / output ports, video input / output ports) for connection with external devices. The input / output unit (240c) can input or output video information / signals, audio information / signals, data, and / or information input from a user. The input / output unit (240c) may include a camera, a microphone, a user input unit, a display unit (240d), a speaker, and / or a haptic module.

[0357] For example, in the case of data communication, the input / output unit (240c) obtains information / signals (e.g., touch, text, voice, image, video) input by the user, and the obtained information / signals can be stored in the memory unit (230). The communication unit (210) converts the information / signals stored in the memory into wireless signals, and can directly transmit the converted wireless signals to other wireless devices or to a base station. In addition, the communication unit (210) can receive wireless signals from other wireless devices or base stations, and then restore the received wireless signals to the original information / signals. The restored information / signals can be stored in the memory unit (230) and then output in various forms (e.g., text, voice, image, video, haptic) through the input / output unit (240c).

[0358] Figure 38 illustrates examples of vehicles or autonomous vehicles applicable to the present disclosure. The vehicles or autonomous vehicles may be implemented as mobile robots, cars, trains, manned / unmanned aerial vehicles (AVs), ships, etc.

[0359] Referring to FIG. 38, a vehicle or autonomous vehicle (200-1) may include an antenna unit (208-1), a communication unit (210-1), a control unit (220-1), a driving unit (240a-1), a power supply unit (240b-1), a sensor unit (240c-1), and an autonomous driving unit (240d-1). The antenna unit (208-1) may be configured as a part of the communication unit (210-1). Blocks 210-1 / 230-1 / 240a-1 to 240d-1 of FIG. 38 correspond to blocks 210 / 230 / 240 of FIG. 36, respectively.

[0360] The communication unit (210-1) can transmit and receive signals (e.g., data, control signals, etc.) with external devices such as other vehicles, base stations (e.g., base stations, roadside base stations (ROS), etc.), and servers. The control unit (220-1) can control elements of the vehicle or autonomous vehicle (200-1) to perform various operations. The control unit (220-1) may include an ECU (Electronic Control Unit). The drive unit (240a-1) can drive the vehicle or autonomous vehicle (200-1) on the ground. The drive unit (240a-1) may include an engine, a motor, a power train, wheels, brakes, a steering device, etc. The power supply unit (240b-1) supplies power to the vehicle or autonomous vehicle (200-1) and may include a wired / wireless charging circuit, a battery, etc. The sensor unit (240c-1) can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit (240c-1) may include an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an incline sensor, a weight detection sensor, a heading sensor, a position module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, etc. The autonomous driving unit (240d-1) may implement a technology for maintaining a driving lane, a technology for automatically controlling speed such as adaptive cruise control, a technology for automatically driving along a set path, a technology for automatically setting a path and driving when a destination is set, etc.

[0361] For example, the communication unit (210-1) can receive map data, traffic information data, etc. from an external server. The autonomous driving unit (240d-1) can generate an autonomous driving route and driving plan based on the acquired data. The control unit (220-1) can control the drive unit (240a-1) so that the vehicle or autonomous vehicle (200-1) moves along the autonomous driving route according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit (210-1) can irregularly / periodically acquire the latest traffic information data from an external server and can acquire surrounding traffic information data from surrounding vehicles. In addition, during autonomous driving, the sensor unit (240c-1) can acquire vehicle status and surrounding environment information. The autonomous driving unit (240d-1) can update the autonomous driving route and driving plan based on newly acquired data / information. The communication unit (210-1) can transmit information regarding the vehicle location, autonomous driving route, driving plan, etc. to an external server. The external server can predict traffic information data in advance using AI technology, etc. based on information collected from the vehicle or autonomous vehicles, and provide the predicted traffic information data to the vehicle or autonomous vehicles. If the device (220-2) is an autonomous vehicle, it can perform the same procedure as the vehicle or autonomous vehicle (200-1). In addition, if the device (220-2) is a base station or a roadside base station, the device (220-2) can transmit data, control signals, etc. to the vehicle or autonomous vehicle (200-1) through the communication unit (210-2).

[0362] Figure 39 illustrates an example of a vehicle applicable to the present disclosure. The vehicle may also be implemented as a means of transportation, a train, an aircraft, a ship, etc. Referring to Figure 39, the vehicle (200) may include a communication unit (210), a control unit (220), a memory unit (230), an input / output unit (240a), and a position measurement unit (240b). Here, blocks 210 to 230 / 240a to 240b correspond to blocks 210 to 230 / 240 of Figure 36, respectively.

[0363] The communication unit (210) can transmit and receive signals (e.g., data, control signals, etc.) with other vehicles or external devices such as base stations. The control unit (220) can control components of the vehicle (200) to perform various operations. The memory unit (230) can store data / parameters / programs / codes / commands that support various functions of the vehicle (100). The input / output unit (240a) can output AR / VR objects based on information in the memory unit (230). The input / output unit (240a) can include a HUD. The position measurement unit (240b) can obtain position information of the vehicle (200). The position information can include absolute position information of the vehicle (200), position information within a driving line, acceleration information, position information with respect to surrounding vehicles, etc. The position measurement unit (240b) can include GPS and various sensors.

[0364] For example, the communication unit (210) of the vehicle (200) can receive map information, traffic information, etc. from an external server and store them in the memory unit (230). The location measurement unit (240b) can obtain vehicle location information through GPS and various sensors and store the information in the memory unit (230). The control unit (220) can create a virtual object based on the map information, traffic information, and vehicle location information, and the input / output unit (240a) can display the created virtual object on the vehicle window (240a-1, 240a-2). In addition, the control unit (220) can determine whether the vehicle (200) is being driven normally within the driving line based on the vehicle location information. If the vehicle (200) abnormally deviates from the driving line, the control unit (220) can display a warning on the vehicle window through the input / output unit (240a). Additionally, the control unit (220) can broadcast a warning message regarding driving abnormalities to surrounding vehicles through the communication unit (210). Depending on the situation, the control unit (220) can transmit vehicle location information and information regarding driving / vehicle abnormalities to relevant authorities through the communication unit (210).

[0365] Figure 40 illustrates examples of XR devices applicable to the present disclosure. The XR devices may be implemented as HMDs, head-up displays (HUDs) installed in vehicles, televisions, smartphones, computers, wearable devices, home appliances, digital signage, vehicles, robots, and the like.

[0366] Referring to FIG. 40, the XR device (200a) may include a communication unit (210), a control unit (220), a memory unit (230), an input / output unit (240a), a sensor unit (240b), and a power supply unit (240c). Here, blocks 210 to 230 / 240a to 240c of FIG. 40 correspond to blocks 210 to 230 / 240 of FIG. 36, respectively.

[0367] The communication unit (210) can transmit and receive signals (e.g., media data, control signals, etc.) with external devices such as other wireless devices, portable devices, or media servers. The media data can include videos, images, sounds, etc. The control unit (220) can control components of the XR device (200a) to perform various operations. For example, the control unit (220) can be configured to control and / or perform procedures such as video / image acquisition, (video / image) encoding, metadata generation and processing, etc. The memory unit (230) can store data / parameters / programs / codes / commands required for driving the XR device (200a) / generating XR objects. The input / output unit (240a) can obtain control information, data, etc. from the outside, and output the generated XR object. The input / output unit (240a) can include a camera, a microphone, a user input unit, a display unit, a speaker, and / or a haptic module. The sensor unit (240b) can obtain the XR device status, surrounding environment information, user information, etc. The sensor unit (240b) may include a proximity sensor, an illuminance sensor, an acceleration sensor, a magnetic sensor, a gyro sensor, an inertial sensor, an RGB sensor, an IR sensor, a fingerprint recognition sensor, an ultrasonic sensor, a light sensor, a microphone, and / or a radar. The power supply unit (240c) supplies power to the XR device (200a) and may include a wired / wireless charging circuit, a battery, etc.

[0368] For example, the memory unit (230) of the XR device (200a) may include information (e.g., data, etc.) required for creating an XR object (e.g., AR / VR / MR object). The input / output unit (240a) may obtain a command to operate the XR device (200a) from the user, and the control unit (220) may operate the XR device (200a) according to the user's operating command. For example, when the user attempts to watch a movie, news, etc. through the XR device (200a), the control unit (220) may transmit content request information to another device (e.g., a mobile device (200b)) or a media server through the communication unit (230). The communication unit (230) may download / stream content such as movies and news from another device (e.g., a mobile device (200b)) or a media server to the memory unit (230). The control unit (220) controls and / or performs procedures such as video / image acquisition, (video / image) encoding, and metadata generation / processing for content, and can generate / output an XR object based on information about surrounding space or real objects acquired through the input / output unit (240a) / sensor unit (240b).

[0369] In addition, the XR device (200a) is wirelessly connected to the mobile device (200b) through the communication unit (210), and the operation of the XR device (200a) can be controlled by the mobile device (200b). For example, the mobile device (200b) can act as a controller for the XR device (200a). To this end, the XR device (200a) can obtain 3D location information of the mobile device (200b), and then generate and output an XR object corresponding to the mobile device (200b).

[0370] Figure 41 illustrates examples of robots applicable to the present disclosure. Robots can be classified into industrial, medical, household, and military types, depending on their intended use or field.

[0371] Referring to FIG. 41, the robot (200) may include a communication unit (210), a control unit (220), a memory unit (230), an input / output unit (240a), a sensor unit (240b), and a driving unit (240c). Here, blocks 210 to 230 / 240a to 240c of FIG. 41 correspond to blocks 210 to 230 / 240 of FIG. 36, respectively.

[0372] The communication unit (210) can transmit and receive signals (e.g., driving information, control signals, etc.) with external devices such as other wireless devices, other robots, or control servers. The control unit (220) can control components of the robot (200) to perform various operations. The memory unit (230) can store data / parameters / programs / codes / commands that support various functions of the robot (200). The input / output unit (240a) can obtain information from the outside of the robot (200) and output information to the outside of the robot (200). The input / output unit (240a) can include a camera, a microphone, a user input unit, a display unit, a speaker, and / or a haptic module. The sensor unit (240b) can obtain internal information of the robot (200), surrounding environment information, user information, etc. The sensor unit (240b) may include a proximity sensor, an illuminance sensor, an acceleration sensor, a magnetic sensor, a gyro sensor, an inertial sensor, an IR sensor, a fingerprint recognition sensor, an ultrasonic sensor, a light sensor, a microphone, a radar, etc. The driving unit (240c) may perform various physical operations, such as moving the robot joints. In addition, the driving unit (240c) may enable the robot (200) to drive on the ground or fly in the air. The driving unit (240c) may include an actuator, a motor, wheels, brakes, propellers, etc.

[0373] Figure 42 illustrates an example of an AI device applicable to the present disclosure.

[0374] AI devices can be implemented as fixed or mobile devices, such as TVs, projectors, smartphones, PCs, laptops, digital broadcasting terminals, tablet PCs, wearable devices, set-top boxes (STBs), radios, washing machines, refrigerators, digital signage, robots, and vehicles.

[0375] Referring to FIG. 42, the AI ​​device (200) may include a communication unit (210), a control unit (220), a memory unit (230), an input / output unit (240a / 240b), a learning processor unit (240c), and a sensor unit (240d). Blocks 210 to 230 / 240a to 240d of FIG. 42 correspond to blocks 210 to 230 / 140 of FIG. 36, respectively.

[0376] The communication unit (210) can transmit and receive wired and wireless signals (e.g., sensor information, user input, learning models, control signals, etc.) to and from external devices such as other AI devices (e.g., 100a to 100f, 120 of FIG. 1) or AI servers (e.g., 100g of FIG. 1) using wired and wireless communication technology. To this end, the communication unit (210) can transmit information within the memory unit (230) to the external device or transfer a signal received from the external device to the memory unit (230).

[0377] The control unit (220) may determine at least one executable operation of the AI ​​device (200) based on information determined or generated using a data analysis algorithm or a machine learning algorithm. In addition, the control unit (220) may control components of the AI ​​device (200) to perform the determined operation. For example, the control unit (220) may request, search, receive, or utilize data from the learning processor unit (240c) or the memory unit (230), and may control components of the AI ​​device (200) to perform at least one executable operation, a predicted operation, or an operation determined to be desirable. In addition, the control unit (220) may collect history information including the operation contents of the AI ​​device (200) or user feedback on the operation, and store the collected history information in the memory unit (230) or the learning processor unit (240c), or transmit the collected history information to an external device such as an AI server (FIG. 1, 100g). The collected history information may be used to update a learning model.

[0378] The memory unit (230) can store data that supports various functions of the AI ​​device (200). For example, the memory unit (230) can store data obtained from the input unit (240a), data obtained from the communication unit (210), output data of the learning processor unit (240c), and data obtained from the sensing unit (140). In addition, the memory unit (230) can store control information and / or software codes necessary for the operation / execution of the control unit (220).

[0379] The input unit (240a) can obtain various types of data from the outside of the AI ​​device (200). For example, the input unit (220) can obtain learning data for model learning, input data to which the learning model will be applied, etc. The input unit (240a) may include a camera, a microphone, and / or a user input unit. The output unit (240b) may generate output related to vision, hearing, or touch. The output unit (240b) may include a display unit, a speaker, and / or a haptic module, etc. The sensing unit (140d) can obtain at least one of internal information of the AI ​​device (200), information about the surrounding environment of the AI ​​device (200), and user information using various sensors. The sensing unit (140d) may include a proximity sensor, an illuminance sensor, an acceleration sensor, a magnetic sensor, a gyro sensor, an inertial sensor, an RGB sensor, an IR sensor, a fingerprint recognition sensor, an ultrasonic sensor, a light sensor, a microphone, and / or a radar, etc.

[0380] The learning processor unit (240c) can train a model composed of an artificial neural network using learning data. The learning processor unit (240c) can perform AI processing together with the learning processor unit of the AI ​​server (Fig. 1, 100g). The learning processor unit (240c) can process information received from an external device via the communication unit (210) and / or information stored in the memory unit (230). In addition, the output value of the learning processor unit (240c) can be transmitted to an external device via the communication unit (210) and / or stored in the memory unit (230).

[0381] The proposed methods described above can be implemented independently, but they can also be implemented as a combination (or merge) of some of the proposed methods. Rules can be defined so that the base station notifies the terminal of the applicability of the proposed methods (or information about the rules of the proposed methods) through a predefined signal (e.g., a physical layer signal or a higher layer signal).

[0382] The present disclosure may be embodied in other specific forms without departing from the technical ideas and essential features described herein. Therefore, the above detailed description should not be construed as limiting in all respects but rather as illustrative. The scope of the present disclosure should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present disclosure are intended to be included within the scope of the present disclosure. Furthermore, claims that are not explicitly cited in the claims may be combined to form an embodiment or incorporated into a new claim through a post-filing amendment.

[0383] Embodiments of the present disclosure can be applied to various wireless access systems. Examples of various wireless access systems include the 3rd Generation Partnership Project (3GPP) or 3GPP2 systems.

[0384] The embodiments of the present disclosure can be applied not only to the various wireless access systems described above, but also to all technical fields that utilize these various wireless access systems. Furthermore, the proposed method can also be applied to mmWave and THz communication systems utilizing ultra-high frequency bands.

[0385] Additionally, embodiments of the present disclosure can be applied to various applications such as autonomous vehicles and drones.

Claims

1. In a method performed by a first terminal in a wireless communication system, Step of obtaining system information; A step of performing an initial connection procedure with the first base station based on the above system information; A step of receiving setting information regarding channel measurement; A step of performing a channel measurement procedure based on setting information regarding the above channel measurement; A step of receiving a first data signal from the first base station; and Including a step of receiving a second data signal from a second base station, The first data signal includes a first common message decoded by terminals connected to the first base station and a second private message decoded by a second terminal connected to the first base station, A method wherein the second data signal comprises a second common message received through a reconfigurable intelligent surface (RIS) and decoded by terminals connected to the second base station, a first private message decoded by the first terminal, and a third private message decoded by a third terminal connected to the second base station.

2. In paragraph 1, A method wherein the transmission rate division ratio for the first common message and the first private message and the passive element coefficient of the RIS are determined based on the channel measurement procedure.

3. In paragraph 2, The step of decoding the above second data signal is: A step of decoding the second common message from the second data signal; A step of generating a common message removal signal by removing a signal related to the second common message from the second data signal; and A method comprising the step of decoding the first private message based on the common message removal signal.

4. In paragraph 3, A step of obtaining metadata of the first personal message included in the first common message; A step of determining whether the first personal message is successfully received based on the metadata; and If a failure occurs in receiving the first personal message, further comprising a step of requesting the first base station to retransmit the first personal message, A method in which the first personal message is retransmitted by the second base station.

5. In paragraph 4, The above metadata is generated based on information related to a RIS channel including a channel between the first terminal and the RIS and a channel between the RIS and the second base station, A method in which the success or failure of reception of the first personal message is determined based on a comparison of the RIS channel and the channel through which the second data signal is received.

6. In paragraph 1, The above channel measurement procedure is, A step of acquiring a resource to perform measurement based on setting information regarding the above measurement resource; A step of receiving a reference signal from the second base station; Including a step of reporting a channel measurement result based on the measurement result of the reference signal to the second base station, A method in which the above channel measurement results are transmitted to the first base station through the second base station.

7. In paragraph 6, The above channel measurement procedure is performed based on the measurement gap procedure, A method in which the configuration information regarding the above measurement resource includes at least one of a measurement cycle, a measurement section, a measurement target, and a measurement repetition number.

8. In a method performed by a first base station in a wireless communication system, Step of transmitting system information; A step of performing an initial connection procedure with the first terminal; Steps for performing channel measurement procedures; A step for determining setting information regarding cooperative communication; A step of transmitting a first personal message decoded by the first terminal to a second base station; A step of transmitting a first data signal to the first terminal, The first data signal includes a first common message decoded by terminals connected to the first base station and a second private message decoded by a second terminal connected to the first base station, A method wherein the first personal message is included in a second data signal together with a second common message decoded by terminals connected to the second base station and a third personal message decoded by a third terminal connected to the second base station, and is transmitted to the terminal by the second base station via a reconfigurable intelligent surface (RIS).

9. In paragraph 8, The steps for performing the above channel measurement procedure are: A step of transmitting a cooperative communication request message to the second base station; A step of receiving a cooperative communication acceptance message from the second base station; a step of transmitting a channel measurement request message to the second base station; and Including a step of receiving a channel measurement result from the second base station, A method in which the setting information regarding the above cooperative communication is determined based on the results of the above channel measurement.

10. In paragraph 9, A method in which the setting information regarding the cooperative communication includes a common message rate of the first data signal, a beamforming vector of the first base station, a common message rate of the second data signal, a beamforming vector of the second base station, and passive element coefficients of the RIS.

11. In paragraph 9, A method in which the above cooperative communication request message is triggered based on the transmission rate of the first common message and the minimum achievable transmission rate of the first terminal.

12. In paragraph 8, A step of receiving a list of cooperative cells from a network node; and A method further comprising the step of transmitting a reset request signal to the network node based on the list of cooperative cells.

13. In paragraph 12, The steps for performing the above channel measurement procedure are: A step of receiving channel measurement setting information from the above network node; Including a step of transmitting resource allocation information to the terminal based on the above channel measurement setting information, A method in which setting information regarding the above cooperative communication is received from the above network node.

14. A method performed by a network node in a wireless communication system, A step of receiving a reset request signal from a first base station; Steps for performing channel measurement procedures; A step of determining setting information regarding cooperative communication based on the above channel measurement procedure; a step of transmitting a first message to the first base station; and Including the step of transmitting a second message to a second base station, The first message includes a first common message decoded by terminals connected to the first base station and a second private message decoded by a second terminal connected to the first base station, A method wherein the second message includes a second common message decoded by terminals connected to the second base station, a first private message decoded by a first terminal connected to the first base station, and a third private message decoded by a third terminal connected to the second base station.

15. In paragraph 13, The steps for performing the above channel measurement procedure are: A step of transmitting channel measurement setting information to the first base station; A step of transmitting a channel measurement request signal to the second base station; and Including a step of receiving a channel measurement result related to the first terminal from the second base station, A method in which the setting information regarding the above cooperative communication is determined based on the results of the above channel measurement.

16. In a wireless communication system, in the first terminal, Transmitter and receiver; and A processor connected to the above transmitter and receiver is included, The above processor, Obtain system information, Based on the above system information, the initial connection procedure is performed with the first base station, Receive configuration information regarding channel measurements, Perform a channel measurement procedure based on the setting information regarding the above channel measurement, Receive a first data signal from the first base station, configured to receive a second data signal from a second base station, The first data signal includes a first common message decoded by terminals connected to the first base station and a second private message decoded by a second terminal connected to the first base station, A first terminal, wherein the second data signal is received via a reconfigurable intelligent surface (RIS) and includes a second common message decoded by terminals connected to the second base station, a first private message decoded by the first terminal, and a third private message decoded by a third terminal connected to the second base station.

17. In a first base station in a wireless communication system, Transmitter and receiver; and A processor connected to the above transmitter and receiver is included, The above processor, Transmit system information, Perform the initial connection procedure with the first terminal, Perform channel measurement procedures, Determine the settings information for cooperative communication, Transmitting the first personal message decoded by the first terminal to the second base station, configured to transmit a first data signal to the first terminal, The first data signal includes a first common message decoded by terminals connected to the first base station and a second private message decoded by a second terminal connected to the first base station, A first base station in which the first personal message is included in a second data signal together with a second common message decoded by terminals connected to the second base station and a third personal message decoded by a third terminal connected to the second base station, and is transmitted to the terminal by the second base station through a reconfigurable intelligent surface (RIS).

18. In a network node in a wireless communication system, Transmitter and receiver; and A processor connected to the above transmitter and receiver is included, The above processor, Receive a reset request signal from the first base station, Perform channel measurement procedures, Determine the setting information for cooperative communication based on the above channel measurement procedure, Transmit the first message to the first base station, Configured to transmit a second message to a second base station, The first message includes a first common message decoded by terminals connected to the first base station and a second private message decoded by a second terminal connected to the first base station, A network node wherein the second message includes a second common message decoded by terminals connected to the second base station, a first private message decoded by a first terminal connected to the first base station, and a third private message decoded by a third terminal connected to the second base station.

19. In communication devices, At least one processor; At least one computer memory connected to said at least one processor and storing instructions that direct operations when executed by said at least one processor, The above actions are, Step of obtaining system information; A step of performing an initial connection procedure with the first base station based on the above system information; A step of receiving setting information regarding channel measurement; A step of performing a channel measurement procedure based on setting information regarding the above channel measurement; A step of receiving a first data signal from the first base station; and Including a step of receiving a second data signal from a second base station, The first data signal includes a first common message decoded by terminals connected to the first base station and a second private message decoded by a second terminal connected to the first base station, A communication device, wherein the second data signal is received through a reconfigurable intelligent surface (RIS) and includes a second common message decoded by terminals connected to the second base station, a first private message decoded by the communication device, and a third private message decoded by a third terminal connected to the second base station.

20. In a non-transitory computer-readable medium storing at least one instruction, comprising at least one instruction executable by the processor, At least one of the above commands causes the device to: Obtain system information, Based on the above system information, the initial connection procedure is performed with the first base station, Receive configuration information regarding channel measurements, Perform a channel measurement procedure based on the setting information regarding the above channel measurement, Receive a first data signal from the first base station, configured to receive a second data signal from a second base station, The first data signal includes a first common message decoded by terminals connected to the first base station and a second private message decoded by a second terminal connected to the first base station, A computer-readable medium comprising: a second data signal received via a reconfigurable intelligent surface (RIS) and decoded by terminals connected to the second base station; a first private message decoded by the device; and a third private message decoded by a third terminal connected to the second base station.

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