Method and device for performing communication in wireless communication system

Abstract

Provided are a method by which a device performs wireless communication, and a device for supporting same. The method may comprise the steps of: obtaining, by a first device, information related to a first target error ratio related to first forward error correction coding for a first layer; obtaining, by the first device, information related to a second target error ratio related to second forward error correction coding for a second layer; and reporting, by the first device, first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding on the basis of the information related to the first target error ratio and the information related to the second target error ratio.

Description

Method and device for performing communication in a wireless communication system

[0001] The present disclosure relates to a wireless communication system.

[0002] 5G NR, the successor to LTE (long-term evolution), is a new clean-slate mobile communications system characterized by high performance, low latency, and high availability. 5G NR can utilize all available spectrum resources, from low-frequency bands below 1 GHz, mid-frequency bands between 1 GHz and 10 GHz, and high-frequency (millimeter wave) bands above 24 GHz.

[0003] The 6G (wireless communication) system aims to achieve (i) very high data rates per device, (ii) a very large number of connected devices, (iii) global connectivity, (iv) very low latency, (v) low energy consumption for battery-free Internet of Things (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 satisfy the requirements as shown in Table 1 below. For example, Table 1 can represent an example of the requirements of a 6G system.

[0004] Maximum data rate per device: 1 Tbps, E2E latency: 1 ms, Maximum spectral efficiency: 100 bps / Hz, Mobility support: Up to 1000 km / hr, Satellite integration: Fully AI, Fully autonomous driving, Fully XR, Fully haptic communication

[0005] According to one embodiment of the present disclosure, a method may be provided. For example, the method may include: a first device obtaining information related to a first target error rate associated with a first forward error correction coding for a first layer; a first device obtaining information related to a second target error rate associated with a second forward error correction coding for a second layer; and a first device reporting, based on the information related to the first target error rate and the information related to the second target error rate, first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding.

[0006] According to one embodiment of the present disclosure, a first device may be provided. For example, the first device may include at least one transceiver; at least one processor; and at least one memory coupled to the at least one processor and storing instructions. For example, the instructions, when executed by the at least one processor, may cause the first device to: obtain information related to a first target error rate associated with a first forward error correction coding for a first layer; obtain information related to a second target error rate associated with a second forward error correction coding for a second layer; and report, based on the information related to the first target error rate and the information related to the second target error rate, first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding.

[0007] According to one embodiment of the present disclosure, a processing device (configured to control a first device) may be provided. For example, the processing device may include at least one processor; and at least one memory coupled to the at least one processor and storing instructions. For example, the instructions, when executed by the at least one processor, may cause the first device to: obtain information related to a first target error rate associated with a first forward error correction coding for a first layer; obtain information related to a second target error rate associated with a second forward error correction coding for a second layer; and report, based on the information related to the first target error rate and the information related to the second target error rate, first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding.

[0008] According to one embodiment of the present disclosure, a non-transitory computer-readable storage medium having instructions recorded thereon may be provided. For example, the instructions, when executed, may cause a first device to: obtain information related to a first target error rate associated with a first forward error correction coding for a first layer; obtain information related to a second target error rate associated with a second forward error correction coding for a second layer; and report, based on the information related to the first target error rate and the information related to the second target error rate, first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding.

[0009] According to one embodiment of the present disclosure, a method may be provided. For example, the method may include: a step of transmitting, by a second device, information related to a first target error rate associated with a first forward error correction coding for a first layer; a step of transmitting, by the second device, information related to a second target error rate associated with a second forward error correction coding for the second layer; and a step of receiving, by the second device, first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding based on the information related to the first target error rate and the information related to the second target error rate.

[0010] According to one embodiment of the present disclosure, a second device may be provided. For example, the second device may include at least one transceiver; at least one processor; and at least one memory coupled to the at least one processor and storing instructions. For example, the instructions, when executed by the at least one processor, may cause the second device to: transmit information related to a first target error rate associated with a first forward error correction coding for a first layer; transmit information related to a second target error rate associated with a second forward error correction coding for a second layer; and receive, based on the information related to the first target error rate and the information related to the second target error rate, first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding.

[0011] According to one embodiment of the present disclosure, a processing device (configured to control a second device) may be provided. For example, the processing device may include at least one processor; and at least one memory coupled to the at least one processor and storing instructions. For example, the instructions, when executed by the at least one processor, may cause the second device to: transmit information related to a first target error rate associated with a first forward error correction coding for a first layer; transmit information related to a second target error rate associated with a second forward error correction coding for a second layer; and receive, based on the information related to the first target error rate and the information related to the second target error rate, first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding.

[0012] According to one embodiment of the present disclosure, a non-transitory computer-readable storage medium having instructions recorded thereon may be provided. For example, the instructions, when executed, may cause a second device to: transmit information related to a first target error rate associated with a first forward error correction coding for a first layer; transmit information related to a second target error rate associated with a second forward error correction coding for a second layer; and receive, based on the information related to the first target error rate and the information related to the second target error rate, first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding.

[0013] Figure 1 illustrates a device-to-device communication procedure according to one embodiment of the present disclosure.

[0014] FIG. 2 illustrates a radio protocol architecture according to one embodiment of the present disclosure.

[0015] FIG. 3 illustrates the structure of a wireless frame according to one embodiment of the present disclosure.

[0016] FIG. 4 illustrates a slot structure of a frame according to one embodiment of the present disclosure.

[0017] FIG. 5 illustrates an example of a BWP according to one embodiment of the present disclosure.

[0018] FIG. 6 illustrates a communication structure that can be provided in a 6G system according to one embodiment of the present disclosure.

[0019] FIG. 7 illustrates an example of a communication scenario based on a 6G system according to one embodiment of the present disclosure.

[0020] FIGS. 8A and 8B illustrate a non-terrestrial network scenario according to one embodiment of the present disclosure.

[0021] FIG. 9 illustrates a procedure for downlink transmission and reception according to one embodiment of the present disclosure.

[0022] FIG. 10 illustrates a procedure for uplink transmission and reception according to one embodiment of the present disclosure.

[0023] FIG. 11 illustrates an example of an NTN according to one embodiment of the present disclosure.

[0024] FIG. 12 illustrates an example of a feedback procedure based on hierarchical forward error correction (FEC) coding according to one embodiment of the present disclosure.

[0025] FIG. 13 illustrates a method for a first device to perform wireless communication according to one embodiment of the present disclosure.

[0026] FIG. 14 illustrates a method for a second device to perform wireless communication according to one embodiment of the present disclosure.

[0027] FIG. 15 illustrates a communication system (1) according to one embodiment of the present disclosure.

[0028] FIG. 16 illustrates a wireless device according to one embodiment of the present disclosure.

[0029] FIG. 17 illustrates a signal processing circuit for a transmission signal according to one embodiment of the present disclosure.

[0030] FIG. 18 illustrates a wireless device according to one embodiment of the present disclosure.

[0031] FIG. 19 illustrates a mobile device according to an embodiment of the present disclosure.

[0032] In this disclosure, "A or B" can mean "only A," "only B," or "both A and B." In other words, "A or B" in this disclosure can be interpreted as "A and / or B." For example, "A, B or C" in this disclosure can mean "only A," "only B," "only C," or "any combination of A, B and C."

[0033] As used herein, a slash ( / ) or a comma may mean "and / or." For example, "A / B" may mean "A and / or B." Accordingly, "A / B" may mean "only A," "only B," or "both A and B." For example, "A, B, C" may mean "A, B, or C."

[0034] In the present disclosure, “at least one of A and B” may mean “only A,” “only B,” or “both A and B.” Additionally, in the present disclosure, the expressions “at least one of A or B” or “at least one of A and / or B” may be interpreted identically to “at least one of A and B.”

[0035] Additionally, in the present disclosure, “at least one of A, B and C” can mean “only A,” “only B,” “only C,” or “any combination of A, B and C.” Additionally, “at least one of A, B or C” or “at least one of A, B and / or C” can mean “at least one of A, B and C.”

[0036] Additionally, parentheses used in the present disclosure may mean "for example." Specifically, when indicated as "control information (PDCCH)", "PDCCH" may be proposed as an example of "control information." In other words, "control information" in the present disclosure is not limited to "PDCCH," and "PDCCH" may be proposed as an example of "control information." Furthermore, even when indicated as "control information (e.g., PDCCH)", "PDCCH" may be proposed as an example of "control information."

[0037] In the following explanation, ‘when, if, in case of’ can be replaced with ‘based on’.

[0038] Technical features individually described in one drawing in this disclosure may be implemented individually or simultaneously.

[0039] In the present disclosure, higher layer parameters may be parameters set for the terminal, preset, or predefined. For example, a base station or network may transmit higher layer parameters to the terminal. For example, the higher layer parameters may be transmitted via radio resource control (RRC) signaling or medium access control (MAC) signaling.

[0040] In the present disclosure, "setting or defining" may be interpreted as being set or preset to a device through predefined signaling (e.g., SIB, MAC, RRC, DCI (downlink control information), etc.) from a base station or a network. In the present disclosure, "setting or defining" may be interpreted as being set or preset to a device through predefined signaling (e.g., MAC, RRC, SCI (sidelink control information), device-to-device signaling control information, etc.) from another device. In the present disclosure, "setting or defining" may be interpreted as being set or preset to a device.

[0041] In the present disclosure, a user equipment (UE) may refer to a device, a portable device, a wireless device, etc. In the present disclosure, a base station (BS) may refer to a radio access network (RAN) node, a non-terrestrial network (NTN) cell / node, a transmission reception point (TRP), a network, an integrated access and backhaul (IAB) node, a device, a portable device, a wireless device, etc.

[0042] The technology proposed in the present disclosure can be used in various wireless communication 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). CDMA can be implemented with wireless technologies such as UTRA (universal terrestrial radio access) or CDMA2000. TDMA can be implemented with wireless technologies such as GSM (global system for mobile communications) / GPRS (general packet radio service) / EDGE (enhanced data rates for GSM evolution). OFDMA can be implemented with wireless technologies such as IEEE (Institute of Electrical and Electronics Engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (evolved UTRA), LTE (long term evolution), and 5G NR.

[0043] The technology proposed in this disclosure can be implemented with 6G wireless technology and applied to various 6G systems. For example, 6G systems can have key factors such as enhanced mobile broadband (eMBB), ultra-reliable low latency communications (URLLC), massive machine-type communication (mMTC), artificial intelligence (AI) integrated communication, tactile internet, high throughput, high network capacity, high energy efficiency, low backhaul and access network congestion, and enhanced data security.

[0044] FIG. 1 illustrates a device-to-device communication procedure according to one embodiment of the present disclosure. The embodiment of FIG. 1 may be combined with various embodiments of the present disclosure, and some descriptions, functions, procedures, proposals, methods, and / or operations of the embodiments may be omitted.

[0045] Referring to FIG. 1, in step S101, a first device and a second device can perform synchronization. For example, the first device can be a terminal and / or at least one of the devices proposed in the present disclosure. For example, the second device can be a base station, a network, a RAN node, an NTN node / cell, a TRP, a terminal and / or at least one of the devices proposed in the present disclosure. For example, the first device can perform an initial cell search operation. For example, the first device can detect at least one synchronization signal transmitted by the second device according to a predefined rule. Here, for example, the synchronization signal can include a plurality of synchronization signals classified according to a structure or purpose (e.g., a primary synchronization signal, a secondary synchronization signal, etc.). Through this, the first device can identify the boundaries of the frame, subframe, time unit, slot, and / or symbol of the second device, and the first device can obtain information about the second device (e.g., a cell identifier).

[0046] In step S103, the first device can obtain system information transmitted by the second device. For example, the system information may include information related to the properties, characteristics, and / or capabilities of the second device required to connect to the second device and use the service. For example, the system information may be classified according to content (e.g., whether it is essential for connection), transmission structure (e.g., the channel used, whether it is provided on-demand), etc. For example, the system information may be classified into a master information block (MIB) and a system information block (SIB). For example, if necessary, the first device may transmit a signal requesting system information before receiving the system information. For example, the request and provision of system information may be performed after a random access procedure described below.

[0047] In step S105, the first device and the second device can perform a random access procedure. For example, the first device can transmit and / or receive at least one message (e.g., a random access preamble, a random access response message, etc.) for the random access procedure based on information related to a random access channel of the second device obtained through system information (e.g., channel location, channel structure, structure of supported preamble, etc.). For example, the first device can transmit a preamble (e.g., Msg1) through the random access channel, the first device can receive a random access response message (e.g., Msg2), the first device can transmit a message (e.g., Msg3) including information related to the first device (e.g., identification information) to the second device using scheduling information included in the random access response message, and the first device can receive a message (e.g., Msg4) for contention resolution and / or connection establishment. For example, Msg1 and Msg3 can be sent and received as one message (e.g., MsgA), and / or Msg2 and Msg4 can be sent and received as one message (e.g., MsgB).

[0048] In step S107, the first device and the second device may perform signaling of control information. Here, for example, 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), a layer that handles physical channels (e.g., a physical (PHY) layer), etc. For example, the first device and the second device may perform at least one of signaling for establishing a connection, signaling for determining settings related to communication, and / or signaling for indicating allocated resources. For example, the control information may be signaled / transmitted via a control channel. For example, the control information and / or the control channel may be used to schedule at least one of data, a data channel (e.g., a shared channel), and / or control information on the data channel.

[0049] In step S109, the first device and the second device may transmit and / or receive data. For example, the first device and the second device may process, transmit, and / or receive data based on signaling of control information. For example, when transmitting data, the first device or the second device may perform at least one of channel encoding, rate matching, scrambling, constellation mapping, layer mapping, waveform modulation, antenna mapping, and / or resource mapping on the information bits. For example, when receiving data, the first device or the second device may perform at least one of signal extraction from resources, waveform demodulation for each antenna, signal arrangement considering layer mapping, constellation demapping, descrambling, and / or channel decoding.

[0050] For example, the layers of a radio interface protocol between a first device and a second device can be divided into L1 (layer 1), L2 (layer 2), L3 (layer 3), etc. For example, a physical layer belonging to the first layer can provide an information transfer service using a physical channel, and an RRC (radio resource control) layer located in the third layer can play a role in controlling radio resources between the first device and the second device. For this purpose, for example, the RRC layer can exchange RRC messages between the first device and the second device.

[0051] FIG. 2 illustrates a radio protocol architecture according to an embodiment of the present disclosure. The embodiment of FIG. 2 may be combined with various embodiments of the present disclosure, and some descriptions, functions, procedures, proposals, methods, and / or operations of the embodiments may be omitted. For example, (a) of FIG. 2 may illustrate a radio protocol stack of a user plane for uplink communication or downlink communication, and (b) of FIG. 2 may illustrate a radio protocol stack of a control plane for uplink communication or downlink communication. For example, (c) of FIG. 2 may illustrate a radio protocol stack of a user plane for device-to-device communication, and (d) of FIG. 2 may illustrate a radio protocol stack of a control plane for device-to-device communication.

[0052] For example, the physical layer can provide information transmission services to upper layers using physical channels. For example, the physical layer can be connected to the upper layer, the medium access control (MAC) layer, through a transport channel. For example, data can be transmitted between the MAC layer and the physical layer through the transport channel. For example, transport channels can be classified according to how and with what characteristics data is transmitted over the wireless interface. For example, data can be transmitted between different physical layers, for example, between the physical layers of a first device and a second device, through a physical channel. For example, the physical channel can be modulated using an orthogonal frequency division multiplexing (OFDM) scheme, and time and frequency can be utilized as radio resources.

[0053] For example, the MAC layer can provide services to the upper layer, the radio link control (RLC) layer, through logical channels. For example, the MAC layer can provide a mapping function from multiple logical channels to multiple transport channels. For example, the MAC layer can provide a logical channel multiplexing function by mapping multiple logical channels to a single transport channel. For example, the MAC sublayer can provide data transmission services on logical channels.

[0054] For example, the RLC layer can perform concatenation, segmentation, and reassembly of RLC service data units (SDUs). For example, to guarantee the various quality of service (QoS) required by radio bearers (RBs), the RLC layer can provide three operating modes: transparent mode (TM), unacknowledged mode (UM), and acknowledged mode (AM). For example, AM RLC can provide error correction through automatic repeat request (ARQ).

[0055] For example, the RRC (radio resource control) layer can be defined only in the control plane. For example, the RRC layer can be responsible for controlling logical channels, transport channels, and physical channels in relation to the configuration, re-configuration, and release of radio bearers. For example, an RB can mean a logical path provided by a first layer (e.g., a physical layer) and a second layer (e.g., a MAC layer, an RLC layer, a PDCP (packet data convergence protocol) layer, a SDAP (service data adaptation protocol) layer, etc.) for data transmission between a first device and a second device.

[0056] For example, the functions of the PDCP layer in the user plane may include forwarding of user data, header compression, and ciphering. For example, the functions of the PDCP layer in the control plane may include forwarding of control plane data and ciphering / integrity protection.

[0057] For example, establishing an RB can refer to the process of defining the characteristics of the radio protocol layer and channel to provide a specific service, and setting specific parameters and operating methods for each. For example, RBs can be divided into two types: signaling radio bearers (SRBs) and data radio bearers (DRBs). For example, SRBs can be used as a channel to transmit RRC messages in the control plane, while DRBs can be used as a channel to transmit user data in the user plane.

[0058] For example, if an RRC connection is established between the RRC layer of the terminal and the RRC layer of the base station, the terminal will be in the RRC_CONNECTED state, and if not, it may be in the RRC_IDLE state. For example, in the case of NR, the RRC_INACTIVE state is additionally defined, and a terminal in the RRC_INACTIVE state can release the connection with the base station while maintaining the connection with the core network.

[0059] For example, a downlink transmission channel may include at least one of a broadcast channel (BCH) for transmitting system information, and / or a downlink shared channel (SCH) for transmitting user traffic or control messages. For example, traffic or control messages of a downlink multicast or broadcast service may be transmitted through the downlink SCH, or may be transmitted through a separate downlink multicast channel (MCH). Meanwhile, an uplink transmission channel may include at least one of a random access channel (RACH) for transmitting initial control messages, and / or an uplink shared channel (SCH) for transmitting user traffic or control messages. For example, a logical channel located above a transmission channel and mapped to the transmission channel may include at least one of a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), and / or a multicast traffic channel (MTCH).

[0060] FIG. 3 illustrates the structure of a wireless frame according to an embodiment of the present disclosure. The embodiment of FIG. 3 may be combined with various embodiments of the present disclosure, and some descriptions, functions, procedures, proposals, methods, and / or operations of the embodiments may be omitted.

[0061] Referring to FIG. 3, for example, a radio frame may be used in uplink transmission, downlink transmission, and / or device-to-device transmission. For example, a radio frame may have a length of 10 ms and may be defined as two 5 ms half-frames (HF). For example, a half-frame may include five 1 ms subframes (SF). For example, a subframe may be divided into one or more slots, and the number of slots within a subframe may be determined according to a subcarrier spacing (SCS). For example, each slot may include 12 or 14 OFDM (A) symbols, depending on a cyclic prefix (CP).

[0062] For example, when normal CP is used, each slot can contain 14 symbols. For example, when extended CP is used, each slot can contain 12 symbols. Here, for example, the symbols can contain OFDM symbols (or CP-OFDM symbols), SC-FDMA (single carrier-FDMA) symbols (or DFT-s-OFDM (Discrete Fourier Transform-spread-OFDM) symbols).

[0063] Table 2 below shows the number of symbols per slot (N) depending on the SCS setting (u) when normal CP or extended CP is used. slot symb ), number of slots per frame (N frame,u slot ) and the number of slots per subframe (N subframe,u slot ) is an example.

[0064] CP type SCS (15*2 u )N slot symb N frame,u slot N subframe,u slotNormal CP15kHz (u=0)1410130kHz (u=1)1420260kHz (u=2)14404120kHz (u=3)14808240kHz (u=4)1416016Extended CP60kHz (u=2)12404

[0065] For example, OFDM(A) numerology (e.g., SCS, CP length, etc.) may be set differently between multiple cells that are merged into a single terminal. Accordingly, the (absolute time) interval of time resources (e.g., subframes, slots, or transmit time intervals (TTIs)) composed of the same number of symbols may be set differently between the merged cells. For example, in the present disclosure, time resources such as subframes, slots, TTIs, etc. may be referred to as time units.

[0066] For example, multiple numerologies, or SCSs, may be supported to support various services. For example, a 15 kHz SCS may support wide areas in traditional cellular bands, while a 30 kHz / 60 kHz SCS may support dense urban areas, lower latency, and wider carrier bandwidth. For example, a 60 kHz or higher SCS may support bandwidths greater than 24.25 GHz to overcome phase noise.

[0067] FIG. 4 illustrates a slot structure of a frame according to an embodiment of the present disclosure. The embodiment of FIG. 4 may be combined with various embodiments of the present disclosure, and some descriptions, functions, procedures, proposals, methods, and / or operations of the embodiments may be omitted.

[0068] Referring to FIG. 4, for example, a slot may include multiple symbols in the time domain. For example, a carrier may include multiple subcarriers in the frequency domain. For example, a resource block (RB) may be defined as multiple consecutive subcarriers in the frequency domain. For example, a bandwidth part (BWP) may be defined as multiple consecutive (P)RBs ((physical) resource blocks) in the frequency domain, and may correspond to one numerology (e.g., SCS, CP length, etc.). For example, a carrier may include at most N BWPs (where N is a positive integer). For example, data communication may be performed through an activated BWP. For example, each element may be referred to as a resource element (RE) in the resource grid, and one complex symbol may be mapped to it.

[0069] For example, a BWP may be a contiguous set of PRBs in a given numerology. For example, a PRB may be selected from a contiguous subset of common resource blocks (CRBs) for a given numerology on a given carrier.

[0070] For example, the BWP may be at least one of an active BWP, an initial BWP, and / or a default BWP. For example, the UE may not monitor the downlink radio link quality in a DL BWP other than the active DL BWP on the PCell (primary cell). For example, the UE may not receive a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), or a channel state information-reference signal (CSI-RS) (except for radio resource management (RRM)) outside of the active DL BWP. For example, the UE may not trigger channel state information (CSI) reporting for an inactive DL BWP. For example, the UE may not transmit a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) outside of the active UL BWP. For example, for downlink, the initial BWP can be given as a set of consecutive resource blocks (RBs) for the remaining minimum system information (RMSI) CORESET (control resource set) (set by the physical broadcast channel (PBCH)). For uplink, for example, the initial BWP can be given by the system information block (SIB) for the random access procedure. For example, the default BWP can be set by a higher layer. For example, the initial value of the default BWP can be the initial DL BWP.For energy saving, if a terminal does not detect DCI (downlink control information) for a certain period of time, the terminal may switch its active BWP to a default BWP.

[0071] FIG. 5 illustrates an example of a BWP according to an embodiment of the present disclosure. The embodiment of FIG. 5 may be combined with various embodiments of the present disclosure, and some descriptions, functions, procedures, proposals, methods, and / or operations of the embodiments may be omitted. In the embodiment of FIG. 5, it is assumed that there are three BWPs.

[0072] Referring to FIG. 5, for example, a common resource block (CRB) may be a carrier resource block numbered from one end of a carrier band to the other, and a PRB may be a numbered resource block within each BWP. For example, point A may indicate a common reference point for a resource block grid.

[0073] For example, BWP is point A, offset from point A (N start BWP ) and bandwidth (N size BWP ) can be set by. For example, point A can be an outer reference point of the PRB of a carrier where subcarrier 0 of all numerologies (e.g., all numerologies supported by the network on that carrier) aligns. For example, the offset can be the PRB spacing between the lowest subcarrier in a given numerology and point A. For example, the bandwidth can be the number of PRBs in a given numerology.

[0074] FIG. 6 illustrates a communication structure that can be provided in a 6G system according to an embodiment of the present disclosure. The embodiment of FIG. 6 may be combined with various embodiments of the present disclosure, and some descriptions, functions, procedures, proposals, methods, and / or operations of the embodiments may be omitted.

[0075] As core implementation technologies of the 6G system, technologies such as artificial intelligence (AI), THz (terahertz) communication, optical wireless technology, free-space optical transmission (FSO) backhaul networks, massive MIMO (multiple input multiple output) 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) can be adopted.

[0076] - Artificial Intelligence: Incorporating AI into communications can streamline and improve real-time data transmission. AI can use numerous analytics to determine how complex target tasks should be performed. For example, AI can increase efficiency and reduce processing delays. Time-consuming tasks such as handovers, network selection, and resource scheduling can be performed instantly using AI. AI can also play a crucial role in machine-to-machine (M2M), machine-to-human, and human-to-machine communications. AI can also facilitate rapid communication in brain-computer interfaces (BCIs). AI-based communication systems can be supported by metamaterials, intelligent structures, intelligent networks, intelligent devices, intelligent cognitive radios, self-sustaining wireless networks, and machine learning.

[0077] - THz communication (terahertz communication): Data rates can be increased by increasing the bandwidth. This can be achieved by using sub-THz communication with wide bandwidths and applying advanced massive MIMO technology. THz waves, also known as sub-millimeter waves, typically refer to the frequency range between 0.1 THz and 10 THz, with corresponding wavelengths ranging from 0.03 mm to 3 mm. The 100 GHz to 300 GHz band (sub-THz band) is considered a key part of the THz spectrum for cellular communications. Adding the sub-THz band to the mmWave band will increase the capacity of 6G cellular communications. Among the defined THz bands, 300 GHz to 3 THz lies in the far infrared (IR) frequency band. While part of the optical band, the 300 GHz to 3 THz band lies at the boundary of the optical band, immediately following the RF band. Therefore, this 300 GHz to 3 THz band exhibits similarities to RF. Key characteristics of THz communications include (i) the widely available bandwidth to support very high data rates and (ii) the high path loss that occurs at high frequencies (requiring highly directional antennas). The narrow beamwidths generated by highly directional antennas reduce interference. The small wavelength of THz signals allows for a significantly larger number of antenna elements to be integrated into devices and base stations operating in this band. This enables the use of advanced adaptive array technologies to overcome range limitations.

[0078] - Large-scale MIMO technology

[0079] - Hologram beamforming (HBF)

[0080] - Optical wireless technology

[0081] - Free-space optical transmission backhaul network (FSO backhaul network)

[0082] - Quantum communication

[0083] - Cell-free communication

[0084] - Integration of wireless information and power transmission

[0085] - Integration of wireless communication and sensing

[0086] - Integrated access and backhaul network

[0087] - Big data analysis

[0088] - Reconfigurable intelligent surface

[0089] - metaverse

[0090] - Blockchain

[0091] Advanced Air Mobility (AAM): AAM can be a broad concept encompassing urban air mobility (UAM), regional air mobility (RAM), and uncrewed aerial systems (UAS). For example, AAM can include UAM, RAM, UAS, and uncrewed aerial vehicles (UAVs).

[0092] - Autonomous driving (self-driving): V2X (vehicle to everything), a key element in building autonomous driving infrastructure, can be a technology that allows cars to communicate and share with various elements on the road for autonomous driving, such as vehicle to vehicle (V2V) wireless communication and vehicle to infrastructure (V2I) wireless communication.

[0093] Non-terrestrial network (NTN): NTN can refer to a network or network segment that utilizes radio frequency (RF) resources mounted on satellites (or UAS platforms). NTN services may be considered to secure wider coverage or provide wireless communication services in locations where the installation of wireless communication base stations is difficult.

[0094] - Integrated sensing and communication (ISAC): Wireless sensing is a technology that uses radio frequencies to determine the instantaneous linear velocity, angle, distance (range), etc. of an object, thereby obtaining information about the characteristics of the environment and / or objects within the environment.

[0095] - Reconfigurable intelligent surface (RIS): RIS can be used to manipulate and enhance signal propagation in wireless communication environments. For example, a RIS can be composed of many small antennas, or metasurfaces, arranged on a surface, each of which can actively control the phase, amplitude, polarization, etc. of the reflected signal. For example, a RIS can improve signal reception by controlling the path, phase, and / or intensity of the propagating signal. For example, in the case of a RIS, power consumption can be very low because power is consumed only for controlling the phase and amplitude of the small antennas. For example, because a RIS can be reconfigured to suit different environments, it can meet various communication requirements and operate effectively in dynamic network environments.

[0096] FIG. 7 illustrates an example of a communication scenario based on a 6G system, according to an embodiment of the present disclosure. The embodiment of FIG. 7 may be combined with various embodiments of the present disclosure, and some descriptions, functions, procedures, proposals, methods, and / or operations of the embodiments may be omitted.

[0097] Referring to FIG. 7, NTN communication can be performed based on satellite networks, high-altitude platform stations (HAPS) as international mobile telecommunications (IMT) base stations (BS), and terminals capable of aerial communication (e.g., AAMs). For example, to improve coverage, etc., devices such as satellite networks, HIBS, and terminals capable of aerial communication (e.g., AAMs) can act as relays. For example, an AAM can communicate with a base station, a satellite network, etc., and / or an AAM can communicate directly with a terminal, another AAM, etc.

[0098] Figures 8a and 8b illustrate a non-terrestrial network scenario according to an embodiment of the present disclosure. The embodiments of Figures 8a and 8b may be combined with various embodiments of the present disclosure, and some descriptions, functions, procedures, proposals, methods, and / or operations of the embodiments may be omitted.

[0099] Figure 8a illustrates a non-terrestrial network scenario based on a transparent payload, and Figure 8b illustrates a non-terrestrial network scenario based on a regenerative payload. For example, a non-terrestrial network may typically include the following elements:

[0100] - One or more satellite gateways connecting non-terrestrial networks to public data networks.

[0101] - Feeder link or wireless link between the satellite gateway and the satellite (or UAS platform).

[0102] - Service link or wireless link between user equipment and satellite (or UAS platform)

[0103] - A satellite (or UAS platform) capable of implementing transparent or regenerative (including onboard processing) payloads. For example, a satellite (or UAS platform) may generate multiple beams over a given service area, typically bounded by a field of view. For example, the beam footprint may be typically elliptical in shape. For example, the field of view of the satellite (or UAS platform) may vary depending on the onboard antenna diagram and minimum elevation angle. For example, for transparent payloads, radio frequency filtering, frequency conversion, and amplification may be performed. Therefore, the repetitive waveform signal in the payload may remain unchanged. For example, for regenerative payloads, radio frequency filtering, frequency conversion, and amplification, as well as demodulation / decoding, switching and / or routing, and coding / modulation may be performed. This may effectively be equivalent to onboarding all base station functions onto the satellite (or UAS platform).

[0104] - Optionally, inter-satellite link (ISL)

[0105] - User equipment can be serviced by satellites (or UAS platforms) within the target service area.

[0106] FIG. 9 illustrates a procedure for downlink transmission and reception according to an embodiment of the present disclosure. The embodiment of FIG. 9 may be combined with various embodiments of the present disclosure, and some descriptions, functions, procedures, proposals, methods, and / or operations of the embodiments may be omitted.

[0107] Referring to FIG. 9, for example, in step S910, the base station may schedule downlink transmissions such as frequency / time resources, transmission layers, downlink precoder, MCS, etc. For example, the base station may determine a beam for PDSCH transmission of the terminal through the operations described above.

[0108] For example, in step S920, the terminal can receive downlink control information (DCI) for downlink scheduling (e.g., including scheduling information of PDSCH) from the base station on the PDCCH.

[0109] For example, DCI format 1_0 or 1_1 may be used for downlink scheduling, and in particular, DCI format 1_1 may include the following information: Identifier for DCI formats, Bandwidth part indicator, Frequency domain resource assignment, Time domain resource assignment, PRB bundling size indicator, Rate matching indicator, ZP CSI-RS trigger, Antenna port(s), Transmission configuration indication (TCI), SRS request, DMRS (Demodulation Reference Signal) sequence initialization.

[0110] For example, depending on each state indicated in the Antenna port(s) field, a number of DMRS ports can be scheduled, and also single-user (SU) / multi-user (MU) transmission scheduling can be possible.

[0111] For example, the TCI field consists of 3 bits, and QCL for DMRS can be dynamically indicated by indicating up to 8 TCI states depending on the TCI field value.

[0112] For example, in step S930, the terminal can receive downlink data from the base station on the PDSCH.

[0113] For example, if a terminal detects a PDCCH including DCI format 1_0 or 1_1, it can decode the PDSCH according to instructions by the corresponding DCI.

[0114] For example, when a terminal receives a PDSCH scheduled by DCI format 1, the terminal may set a DMRS configuration type by a higher layer parameter 'dmrs-Type', and the DMRS type may be used to receive the PDSCH. For example, the terminal may set a maximum number of DMRA symbols to be front-loaded for the PDSCH by a higher layer parameter 'maxLength'.

[0115] For example, for DMRS configuration type 1, if a terminal is scheduled with a single codeword and is assigned an antenna port mapped with an index of {2, 9, 10, 11, or 30}, or if a terminal is scheduled with two codewords, the terminal can assume that all remaining orthogonal antenna ports are not associated with a PDSCH transmission to another terminal.

[0116] For example, for DMRS configuration type 2, if a terminal is scheduled with a single codeword and is assigned an antenna port mapped with an index of {2, 10, or 23}, or if a terminal is scheduled with two codewords, the terminal can assume that all remaining orthogonal antenna ports are not associated with a PDSCH transmission to another terminal.

[0117] For example, when a terminal receives a PDSCH, a precoding granularity P' can be assumed to be a consecutive resource block in the frequency domain. For example, P' can correspond to one of the values ​​{2, 4, wideband}.

[0118] For example, if P' is determined to be wideband, the terminal does not expect to be scheduled with non-contiguous PRBs, and the terminal can assume that the same precoding is applied to the allocated resources.

[0119] For example, if P' is determined to be one of {2, 4}, a precoding resource block group (PRG) can be divided into P' consecutive PRBs. For example, the actual number of consecutive PRBs within each PRG can be one or more. For example, a UE can assume that the same precoding is applied to consecutive downlink PRBs within a PRG.

[0120] For example, in order for a terminal to determine the modulation order, target code rate, and transport block size within a PDSCH, the terminal may first read a 5-bit MCD field within the DCI to determine the modulation order and target code rate. Then, the terminal may read a redundancy version field within the DCI to determine the redundancy version. Then, the terminal may determine the transport block size using the number of layers and the total number of allocated PRBs before rate matching.

[0121] FIG. 10 illustrates a procedure for uplink transmission and reception according to an embodiment of the present disclosure. The embodiment of FIG. 10 may be combined with various embodiments of the present disclosure, and some descriptions, functions, procedures, proposals, methods, and / or operations of the embodiments may be omitted.

[0122] Referring to FIG. 10, for example, in step S1010, the base station may schedule uplink transmissions such as frequency / time resources, transmission layers, uplink precoder, MCS, etc. For example, the base station may determine a beam for PUSCH transmission of the terminal through the operations described above.

[0123] For example, in step S1020, the terminal may receive DCI for uplink scheduling (e.g., including scheduling information of PUSCH) from the base station on the PDCCH.

[0124] For example, DCI format 0_0 or 0_1 may be used for uplink scheduling, and in particular, DCI format 0_1 ​​may include the following information: DCI format identifier, UL / SUL (Supplementary uplink) indicator, UL / SUL indicator, bandwidth part indicator, frequency domain resource assignment, time domain resource assignment, frequency hopping flag, modulation and coding scheme (MCS), SRS resource indicator (SRI), precoding information and number of layers, antenna port(s), SRS request, DMRS sequence initialization, UL-SCH (Uplink Shared Channel) indicator.

[0125] For example, SRS resources configured within a set of SRS resources associated with the upper layer parameter 'usage' can be indicated by the SRS resource indicator field. For example, 'spatialRelationInfo' can be configured for each SRS resource, and its value can be one of {CRI, SSB, SRI}.

[0126] For example, in step S1030, the terminal may transmit uplink data to the base station on PUSCH.

[0127] For example, if a terminal detects a PDCCH including DCI format 0_0 or 0_1, it can transmit the corresponding PUSCH according to the instructions of the corresponding DCI.

[0128] For example, two transmission schemes (e.g., codebook-based transmission for PUSCH transmission and non-codebook-based transmission for PUSCH transmission) may be supported:

[0129] i) For example, when the upper layer parameter 'txConfig' is set to 'codebook', the terminal may be configured for codebook-based transmission. For example, when the upper layer parameter 'txConfig' is set to 'nonCodebook', the terminal may be configured for non-codebook-based transmission. For example, if the upper layer parameter 'txConfig' is not set, the terminal may not expect to be scheduled by DCI format 0_1. For example, when PUSCH is scheduled by DCI format 0_0, PUSCH transmission may be based on a single antenna port.

[0130] For example, in case of codebook-based transmission, PUSCH can be scheduled in DCI format 0_0, DCI format 0_1, or semi-statically. For example, if this PUSCH is scheduled by DCI format 0_1, the UE can determine the PUSCH transmission precoder based on the SRI, the transmit precoding matrix indicator (TPMI), and the transmission rank from the DCI, as given by the SRS resource indicator field and the precoding information and number of layers field. For example, the TPMI is used to indicate the precoder to be applied across antenna ports, and may correspond to the SRS resource selected by the SRI when multiple SRS resources are configured. For example, if a single SRS resource is configured, the TPMI is used to indicate the precoder to be applied across antenna ports, and may correspond to the single SRS resource. For example, a transmit precoder may be selected from an uplink codebook having the same number of antenna ports as the upper layer parameter 'nrofSRS-Ports'. For example, when a terminal sets an upper layer with 'codebook' as the parameter 'txConfig', the terminal may be configured with at least one SRS resource. For example, an SRI indicated in slot n is associated with the most recent transmission of the SRS resource identified by the SRI, wherein the SRS resource may precede the PDCCH carrying the SRI (e.g., slot n).

[0131] ii) For example, in case of non-codebook based transmission, PUSCH can be scheduled in DCI format 0_0, DCI format 0_1, or semi-statically. For example, when multiple SRS resources are configured, the UE can determine the PUSCH precoder and transmission rank based on the wideband SRI, where the SRI can be given by the SRS resource indicator in the DCI or by the higher layer parameter 'srs-ResourceIndicator'. For example, the UE uses one or multiple SRS resources for SRS transmission, where the number of SRS resources can be configured for simultaneous transmission within the same RB based on the UE capability. For example, only one SRS port can be configured for each SRS resource. For example, only one SRS resource can be configured with the higher layer parameter 'usage' set to 'nonCodebook'. For example, the maximum number of SRS resources that can be configured for non-codebook based uplink transmission may be 4. For example, the SRI indicated in slot n is associated with the most recent transmission of the SRS resource identified by the SRI, where the SRS transmission may precede the PDCCH carrying the SRI (e.g., slot n).

[0132] FIG. 11 illustrates an example of an NTN according to an embodiment of the present disclosure. The embodiment of FIG. 11 may be combined with various embodiments of the present disclosure, and some descriptions, functions, procedures, proposals, methods, and / or operations of the embodiments may be omitted.

[0133] Referring to Fig. 11, examples according to NTN platform types can be shown. For example, examples according to NTN platform types can be HAPS (High-Altitude Platform Station), LEO (Low Earth orbit), MEO (Medium Earth orbit), or GEO (Geo-stationary Earth orbit).

[0134] For example, parameters related to a High-Altitude Platform Station (HAPS) may be as follows: For example, the altitude of the High-Altitude Platform Station (HAPS) may be 20 km. For example, the beam footprint size of the High-Altitude Platform Station (HAPS) may be 5-200 km.

[0135] For example, parameters related to LEO (Low Earth orbit) can be as follows. For example, the altitude of LEO (Low Earth orbit) can be 300-1500 km. For example, the beam footprint size of LEO (Low Earth orbit) can be 100-1000 km. For example, the satellite speed in LEO (Low Earth orbit) can be 7.56 km / sec (for LEO-600). For example, the maximum propagation delay in LEO (Low Earth orbit) can be 25.77 msec (for LEO-600).

[0136] For example, parameters related to MEO (Medium Earth orbit) can be as follows. For example, the altitude of MEO (Medium Earth orbit) can be 7000-25000 km. For example, the beam footprint size of MEO (Medium Earth orbit) can be 100-1500 km. For example, the maximum propagation delay of MEO (Medium Earth orbit) can be 95.19 msec (for MEO-10000).

[0137] For example, the parameters related to Geo-stationary Earth orbit (GEO) can be as follows. For example, the altitude of Geo-stationary Earth orbit (GEO) can be 35786 km. For example, the beam footprint size of Geo-stationary Earth orbit (GEO) can be 200-3500 km. For example, the satellite speed of Geo-stationary Earth orbit (GEO) can be 3.1 km / sec (negligible). For example, the maximum propagation delay of Geo-stationary Earth orbit (GEO) can be 541.46 msec.

[0138] Recently, research on non-terrestrial networks (NTNs), which utilize satellites, drones, and other technologies as network nodes, has been actively conducted in the mobile communications field. For example, satellites in NTNs can be broadly categorized into geosynchronous orbit (GSO) satellites and non-GSO (NGSO) satellites. Furthermore, satellites can be categorized based on their altitude into low Earth orbit (LEO), medium Earth orbit (MEO), and high Earth orbit (HEO). In the mobile communications field, LEO-based NTN support methods, which offer relatively low costs and high data rates, are primarily being studied. However, LEO satellites are NGSO satellites and, due to their close proximity to the Earth's surface, require extremely high speeds to maintain their orbit. Therefore, to provide services to terrestrial terminals via LEO satellites, the Doppler shift caused by their high relative velocity and / or the significant time delays associated with their high altitude must be overcome.

[0139] Recently, research on non-terrestrial networks (NTNs) utilizing satellites, drones, and other network nodes has been actively conducted in the mobile communications field. For example, satellites in NTNs can be broadly categorized into GSO satellites with geosynchronous orbits (GSOs) and NGSO satellites without geosynchronous orbits (Non-GSOs). Furthermore, satellites can be categorized into low Earth orbit (LEO), medium Earth orbit (MEO), and high Earth orbit (HEO) based on their altitudes. In the mobile communications field, LEO-based NTN support methods, which offer relatively low costs and high data rates, are primarily being studied. However, satellite-based NTNs can exhibit channel characteristics such as large path loss and / or long time delays and / or large Doppler shifts due to high altitudes and / or high relative velocities.

[0140] Here, the link adaptation (LA) method in the mobile communication system can be largely composed of two LA methods, Inner Loop LA (ILLA) and Outer Loop LA (OLLA). For example, ILLA may refer to a process of determining SINR based on channel quality feedback information (e.g., CSI) reported by a terminal and then mapping it to an MCS, and OLLA may refer to a process of correcting the SINR to an effective SNR based on feedback information for data decoding (e.g., HARQ-ACK). Here, in the non-terrestrial network, a link adaptation method that takes into account large path attenuation and / or long time delay may need to be considered. In view of the above, the present disclosure proposes a method and device for supporting link adaptation in a terrestrial and / or non-terrestrial network.

[0141] Non-Terrestrial Networks (NTNs) can service terrestrial and / or airborne terminals using satellites in Low Earth Orbit (LEO), Medium Earth Orbit (MEO), and Geostationary Earth Orbit (GEO). However, NTN downlink and / or uplink channels can experience long transmission delays, significant path loss, and effects such as Doppler shift due to the high altitude and movement of satellites. Consequently, link adaptation based on conventional Hybrid Automatic Repeat Request (HARQ)-based retransmission procedures can be inefficient in terms of transmission delay and resource utilization.

[0142] Furthermore, conventional Forward Error Correction (FEC) operation methods either apply fixed FEC to either the upper or lower layer, or, even when applying FEC to both layers, lack the technology to set and utilize distinct target error rates (TERs) for each layer. This makes it difficult to optimize FEC operation for each layer's channel characteristics in environments with long delays and significant path attenuation, resulting in reduced transmission efficiency and quality of service (QoS).

[0143] In addition, there is a lack of a feedback structure that allows the base station to precisely control the code rate and redundancy by having the terminal report detailed information to the base station, such as whether the target error rate for each layer has been achieved, the modulation method, and the coding method.

[0144] Accordingly, an object of the present disclosure is to provide a method for supporting efficient link adaptation suitable for long-term delay and large path attenuation environments in both NTN and terrestrial network environments by allowing a terminal to obtain target error rate-related information of each of a first FEC for a first layer (e.g., MAC, RLC, PDCP layer) and a second FEC for a second layer (e.g., PHY layer), and reporting feedback information related to FEC coding of each layer based on the information.

[0145] Hereinafter, the proposed method(s) of the present disclosure are described as an example of a non-terrestrial network, but the proposed method(s) of the present disclosure can be extended and applied to a terrestrial network as well.

[0146] For example, the present disclosure may be configured to integrate between a terrestrial network (TN) and a non-terrestrial network (NTN), and in such a situation, the distinction between TN and NTN may not be explicit. For example, according to the present disclosure, when a terminal is distinguished as being a TN or NTN or classified into categories corresponding thereto, optimized operations appropriate for each can be performed.

[0147] For example, the present disclosure may be applied differently depending on the payload type of the satellite (e.g., regenerative payload or transparent payload).

[0148] For example, the present disclosure may be applied differently depending on the type of non-terrestrial network node (e.g., geostationary earth orbit (GEO), non-geostationary earth orbit (NGEO), low earth orbit (LEO), medium earth orbit (MEO), high altitude satellite platform (HASP), drone) or altitude or fixed beam footprint or cell-moving beam footprint, etc.

[0149] FIG. 12 illustrates an example of a feedback procedure based on hierarchical forward error correction (FEC) coding according to one embodiment of the present disclosure. The embodiment of FIG. 12 may be combined with various embodiments of the present disclosure, and some descriptions, functions, procedures, proposals, methods, and / or operations of the embodiments may be omitted.

[0150] Referring to FIG. 12, the communication system according to the present embodiment can be divided into an upper layer (the first layer, for example, the MAC / RLC / PDCP layer) and a lower layer (the second layer, for example, the PHY layer), and the first FEC coding can be applied to the upper layer, and the second FEC coding can be applied to the lower layer.

[0151] Here, feedback information is information reported by the terminal to the base station (or network node) and can be used to control and optimize the performance of specific FEC coding (e.g., first FEC coding and / or second FEC coding). The feedback information may include, for example, the following:

[0152] - Information regarding modulation and / or coding methods;

[0153] - Whether the target error rate was achieved

[0154] - Measured / predicted error rate value

[0155] - Whether decoding succeeded or failed

[0156] - Required redundancy size

[0157] Specific examples of the above feedback information may include error information for the second FEC coding (hereinafter referred to as a “decoding error report”) and / or a decoding success report and / or a decoding failure report for the first FEC coding.

[0158] Data transmitted from a lower layer may be composed of multiple transport blocks (TBs) to which second FEC coding is applied, and a receiving terminal may determine whether errors in the corresponding TBs are corrected based on channel conditions, modulation methods, coding methods, etc.

[0159] If the error in the TB is not corrected through the second FEC coding in the lower layer, the terminal may generate a decoding error report, which is a form of the aforementioned feedback information, and report it to the upper layer or the base station. The decoding error report may include information related to the modulation and / or coding scheme for the second FEC coding, measured / predicted error rates, and / or redundancy requirements.

[0160] The upper layer may apply the first FEC coding based on the reported feedback information and channel conditions. The first FEC coding may be applied to compensate for TB errors not corrected in the second FEC coding, and a method suitable for restoring long-term reception failure intervals, such as Long Erasure Correction (LEC), may be used.

[0161] The terminal may report to the base station the decoding results after both the first FEC coding and the second FEC coding have been performed. At this time, the reported feedback information may include both the first feedback and the second feedback.

[0162] - First Feedback: Information regarding the modulation and / or coding scheme for the first FEC coding, whether the target error rate was achieved, the measured / predicted error rate, the required redundancy amount, etc. The first feedback may be based on the average performance of the second FEC coding, and may mean, for example, the average error rate for the second FEC coding. This information may be included in the first feedback report or reported as a type of second feedback.

[0163] - Second feedback: Information about the modulation and / or coding scheme for the second FEC coding, whether the target error rate has been achieved, the measured / predicted error rate, the required redundancy size, etc.

[0164] Depending on the decryption result,

[0165] - Case 1: When decoding is successful, the terminal transmits a decoding success report, and may include first feedback and second feedback in the report.

[0166] - Case 2: When decoding fails, the terminal transmits a decoding failure report, and may include first feedback and second feedback in the report.

[0167] In this way, the terminal can report the first feedback and the second feedback simultaneously, and the base station can comprehensively control the modulation method, coding rate, and / or redundancy size of both layers by reflecting the FEC performance of both the upper layer and the lower layer.

[0168] Additionally, the terminal can report feedback information regarding the actual code rate and / or additional required redundancy size based on the data group to which FEC coding was applied, regardless of whether decoding was successful or not. This allows the base station to more precisely control the modulation scheme, coding scheme, code rate, and redundancy size to be applied to future transmissions.

[0169] [Proposal #01] In a terrestrial and / or non-terrestrial network composed of one or more base stations (or network nodes) and terminals, when a first FEC coding for a first SDU in an upper layer (hereinafter, layer 1) and / or a second FEC coding for a second SDU in a lower layer (hereinafter, layer 2) can be applied, the base station (or network node) can provide at least one of the following information to the terminals.

[0170] (1) Target error rate for the first FEC (hereinafter referred to as the first target error rate)

[0171] (2) Target error rate for the second FEC (hereinafter referred to as the second target error rate)

[0172] Here, for example, the first target error rate and / or the second target error rate may be (pre-)defined and / or set and / or indicated by the base station (or network node). The setting and / or indication may be explicit and / or implicit. Here, for example, the FEC (Forward Error Correction) coding may mean coding of a forward error correction method. Here, for example, the SDU (Service Data Unit) may mean a data payload to be transmitted to a lower layer or physical medium (for each transmission unit) based on a specific communication layer. Here, for example, the PDU (Protocol Data Unit) may mean data obtained by adding PCI (Protocol Control Information) to an SDU received from an upper layer (for each transmission unit) based on a specific communication layer. Here, for example, the SDU in the lower layer may be a PDU delivered from the upper layer. Here, for example, the first layer may be a MAC layer and / or an RLC layer and / or a PDCP layer. Here, for example, the second layer may be a PHY layer. Here, for example, the second SDU may be a TB (Transport Block). Here, for example, the first FEC coding (associated with the first layer) may be inter-TB coding. Here, for example, the second FEC coding (associated with the second layer) may be coding for the TB.

[0173] For example, in a non-terrestrial network according to one embodiment of the present disclosure, assume that a base station (or network) can serve ground and / or air terminals based on the non-terrestrial network. For example, in the non-terrestrial network, the base station (or network) can support downlink and / or uplink transmission to ground and / or air terminals via satellite. Here, the downlink and / or uplink channels of the non-terrestrial network may experience significant time delay and / or path attenuation due to the high altitude of the satellite. Here, the non-terrestrial network must be able to support an effective link adaptation method even in an environment of large time delay and / or long path attenuation.

[0174] Here, in a non-terrestrial network, the method of retransmitting data after receiving HARQ-ACK feedback may not be efficient in terms of transmission delay and / or resource utilization due to large path attenuation and / or long time delay. Here, in the non-terrestrial network, a method of restoring failed reception data not based on immediate HARQ-ACK feedback, but by restoring it with FEC coding in a higher layer (hereinafter, referred to as first FEC coding) may be considered. For example, the first FEC coding may have the characteristics of LEC (Long Erasure Correction) coding. For example, the first FEC coding may be an effective method of restoring when data reception fails for a long period of time due to transmission path blockage and / or weather change and / or synchronization error in a three-dimensional space. Here, in addition to the first FEC coding, a second FEC coding may be applied in a lower layer (e.g., a physical layer).

[0175] Here, when the first FEC coding and / or the second FEC coding can be applied in the non-terrestrial network, it may be desirable for the base station (or network node) to control the code rate and / or modulation scheme related to the first FEC coding and / or the second FEC coding according to the channel environment. Here, the FEC coding control method may mean controlling an error rate according to the application of FEC, and the base station (or network node) may transmit a target error rate to the terminal, and the terminal may feed back a modulation and / or coding scheme capable of achieving the target error rate. Therefore, in the present disclosure, in a terrestrial and / or non-terrestrial network composed of one or more base stations (or network nodes) and terminals, when the first FEC coding for the first SDU in the upper layer (hereinafter, the first layer) and / or the second FEC coding for the second SDU in the lower layer (hereinafter, the second layer) can be applied, the base station (or network node) may provide the terminal with at least one of the following information.

[0176] (1) Target error rate for the first FEC (hereinafter referred to as the first target error rate)

[0177] (2) Target error rate for the second FEC (hereinafter referred to as the second target error rate)

[0178] For example, the base station (or network node) may set only the second target error rate (e.g., not applying the first FEC coding) or may set both the first target error rate and the second target error rate (e.g., applying both the first FEC coding and the second FEC coding) depending on the wireless transmission channel environment with the terminal. For example, the first FEC coding may be applied when a phenomenon in which data reception is missed for a long period of time frequently occurs due to a deterioration in the synchronization performance of the terminal.

[0179] The proposed method of the present disclosure has the advantage of enabling the application of a link adaptation method more suitable for long-term delays and / or path attenuation in terrestrial and / or non-terrestrial networks. For example, supporting controllable hierarchical FEC coding according to the present disclosure has the advantage of effectively supporting data restoration even in environments where HARQ-ACK feedback is not used or where terminals frequently experience long periods of inability to receive data.

[0180] The above [Proposal #01] can be applied in combination with other proposed methods(s) to the extent that the proposed actions do not conflict.

[0181] [Proposal #02] In a terrestrial and / or non-terrestrial network composed of one or more base stations (or network nodes) and terminals, when a first FEC coding for a first SDU in an upper layer (hereinafter, layer 1) and / or a second FEC coding for a second SDU in a lower layer (hereinafter, layer 2) can be applied, the terminal can report at least one of the following information to the base station (or network node).

[0182] (1) Feedback information related to modulation and / or coding method for the first FEC coding (hereinafter referred to as the first feedback)

[0183] (2) Feedback information related to modulation and / or coding method for the second FEC coding (hereinafter referred to as the second feedback)

[0184] Here, for example, the terminal reporting may be triggered by a (pre-)defined and / or set and / or instructed by the base station (or network node) or by a (specific) event (pre-)defined and / or set for the terminal. Here, for example, the FEC (Forward Error Correction) coding may mean coding of a forward error correction method. Here, for example, the SDU (Service Data Unit) may mean a data payload to be transmitted to a lower layer or physical medium (for each transmission unit) based on a specific communication layer. Here, for example, the PDU (Protocol Data Unit) may mean data obtained by adding PCI (Protocol Control Information) to an SDU received from an upper layer (for each transmission unit) based on a specific communication layer. Here, for example, the SDU in the lower layer may be a PDU delivered from the upper layer. Here, for example, the first layer may be a MAC layer and / or an RLC layer and / or a PDCP layer. Here, for example, the second layer may be a PHY layer. Here, for example, the second SDU may be a TB (Transport Block). Here, for example, the modulation and / or coding scheme may include information such as modulation order, code rate, and spectral efficiency.For example, the modulation scheme may be OFDM (Orthogonal Frequency Division Multiplexing), DFT-s-OFDM (Discrete Fourier Transform-spread Orthogonal Frequency Division Multiplexing), OCDM (Orthogonal Chirp Division Multiplexing), AFDM (Affine Frequency Division Multiplexing), or OTFS (Orthogonal Time Frequency Space). Here, for example, the modulation and / or coding scheme related feedback may mean a modulation and / or coding scheme that achieves a target error rate of the first and / or second FEC coding. Here, for example, the terminal may select and / or propose configuration information preferred by the terminal when performing the modulation and / or coding scheme related feedback for a specific FEC coding. Here, for example, the terminal may assume a specific (reference) second FEC coding and / or (reference) error rate performance for the second layer when deriving the first feedback information. The above specific (reference) second FEC coding and / or (reference) error rate can be predefined and / or set and / or indicated by the base station (or network node). Here, for example, the terminal can assume specific (reference) first FEC coding and / or (reference) error rate performance for the first layer when deriving the second feedback information. The above specific (reference) first FEC coding and / or (reference) error rate can be predefined and / or set and / or indicated by the base station (or network node). Here, for example, the terminal can report the information to the base station (or network node) in the form of a combination of the first feedback and the second feedback. Here, for example, the feedback for the first FEC coding can be based on an average performance for the second FEC coding.For example, the feedback for the first FEC coding may mean an average error rate related to the second FEC coding, and the information may be reported together with the feedback related to the first FEC coding or may be reported as a type of the feedback related to the second FEC. Here, for example, the first FEC coding (related to the first layer) may be inter-TB coding. Here, for example, the second FEC coding (related to the second layer) may be coding for TB. For example, in a non-terrestrial network according to an embodiment of the present disclosure, assume that a base station (or a network) can serve ground and / or air terminals based on the non-terrestrial network. For example, in the non-terrestrial network, the base station (or the network) can support downlink and / or uplink transmission to the ground and / or air terminals via a satellite. Here, the downlink and / or uplink channels of the non-terrestrial network may experience significant time delay and / or path attenuation due to the high altitude of the satellite. Here, the above non-terrestrial network must be able to support an effective link adaptation method even in a large time delay and / or long path attenuation environment.

[0185] Here, in a non-terrestrial network, the method of retransmitting data after receiving HARQ-ACK feedback may not be efficient in terms of transmission delay and / or resource utilization due to large path attenuation and / or long time delay. Here, in the non-terrestrial network, a method of restoring failed reception data not based on immediate HARQ-ACK feedback, but by restoring it with FEC coding in a higher layer (hereinafter, referred to as first FEC coding) may be considered. For example, the first FEC coding may have the characteristics of LEC (Long Erasure Correction) coding. For example, the first FEC coding may be an effective method of restoring when data reception fails for a long period of time due to transmission path blockage and / or weather change and / or synchronization error in a three-dimensional space. Here, in addition to the first FEC coding, a second FEC coding may be applied in a lower layer (e.g., a physical layer).

[0186] Here, when the first FEC coding and / or the second FEC coding can be applied in the non-terrestrial network, it may be desirable for the base station (or network node) to control the code rate and / or modulation scheme related to the first FEC coding and / or the second FEC coding according to the channel environment. Here, the FEC coding control method may mean controlling an error rate according to the application of FEC, and the base station (or network node) may transmit a target error rate to the terminal, and the terminal may feed back a modulation and / or coding scheme capable of achieving the target error rate. Therefore, in the present disclosure, in a terrestrial and / or non-terrestrial network composed of one or more base stations (or network nodes) and terminals, when the first FEC coding for the first SDU in the upper layer (hereinafter, the first layer) and / or the second FEC coding for the second SDU in the lower layer (hereinafter, the second layer) can be applied, the terminal may report at least one of the following information to the base station (or network node).

[0187] (1) Feedback information related to modulation and / or coding method for the first FEC coding (hereinafter referred to as the first feedback)

[0188] (2) Feedback information related to modulation and / or coding method for the second FEC coding (hereinafter referred to as the second feedback)

[0189] For example, the second layer may be a physical layer, and the second feedback may be channel state information (e.g., Channel State Information (CSI)) feedback in a conventional system. Here, for example, a non-terrestrial network may apply a first FEC coding in a layer above the physical layer, and may newly support the first feedback as terminal feedback for controlling the first FEC coding. Here, for example, the first feedback may be a modulation and / or coding scheme that allows the terminal to achieve a target error rate of the first FEC coding. For example, an appropriate code rate for the first FEC coding may be fed back. Here, for example, the feedback for the first FEC coding may be based on an average performance for the second FEC coding. For example, feedback for the first FEC coding may mean an average error rate related to the second FEC coding, and that information may be reported together with the first FEC coding-related feedback or as a type of the second FEC-related feedback.

[0190] The proposed method of the present disclosure has the advantage of enabling the application of a link adaptation method more suitable for long-term delays and / or path attenuation in terrestrial and / or non-terrestrial networks. For example, supporting controllable hierarchical FEC coding according to the present disclosure has the advantage of effectively supporting data restoration even in environments where HARQ-ACK feedback is not used or where terminals frequently experience long periods of inability to receive data.

[0191] The above [Proposal #02] can be applied in combination with other proposed methods(s) to the extent that the proposed actions do not conflict.

[0192] [Proposal #03] In a terrestrial and / or non-terrestrial network composed of one or more base stations (or network nodes) and terminals, when a first FEC coding for a first SDU in an upper layer (hereinafter, layer 1) and / or a second FEC coding for a second SDU in a lower layer (hereinafter, layer 2) can be applied, the terminal can request application of the first FEC coding when a specific event occurs and / or a setting / instruction is received from the base station (or network node) while only the second FEC coding is applied.

[0193] Here, for example, the terminal request may be (pre-)defined and / or set and / or instructed by the base station (or network node), or may be triggered by a (specific) event (pre-)defined and / or set for the terminal. Here, for example, the FEC (Forward Error Correction) coding may mean coding of a forward error correction method. Here, for example, the SDU (Service Data Unit) may mean a data payload to be transmitted to a lower layer or physical medium (for each transmission unit) based on a specific communication layer. Here, for example, the PDU (Protocol Data Unit) may mean data obtained by adding PCI (Protocol Control Information) to an SDU received from an upper layer (for each transmission unit) based on a specific communication layer. Here, for example, the SDU in the lower layer may be a PDU delivered from the upper layer. Here, for example, the first layer may be a MAC layer and / or an RLC layer and / or a PDCP layer. Here, for example, the second layer may be a PHY layer. Here, for example, the second SDU may be a TB (Transport Block). Here, for example, the modulation and / or coding scheme may include information such as modulation order, code rate, and spectral efficiency.For example, the modulation scheme may be OFDM (Orthogonal Frequency Division Multiplexing), DFT-s-OFDM (Discrete Fourier Transform-spread Orthogonal Frequency Division Multiplexing), OCDM (Orthogonal Chirp Division Multiplexing), AFDM (Affine Frequency Division Multiplexing), or OTFS (Orthogonal Time Frequency Space). Here, for example, the modulation and / or coding-related feedback settings may include an MCS table and / or a CQI (Channel Quality Indication) table, etc. Here, for example, the first FEC coding (associated with the first layer) may be inter-TB coding. Here, for example, the second FEC coding (associated with the second layer) may be coding for TB.

[0194] For example, in a non-terrestrial network according to one embodiment of the present disclosure, assume that a base station (or network) can serve ground and / or air terminals based on the non-terrestrial network. For example, in the non-terrestrial network, the base station (or network) can support downlink and / or uplink transmission to ground and / or air terminals via satellite. Here, the downlink and / or uplink channels of the non-terrestrial network may experience significant time delay and / or path attenuation due to the high altitude of the satellite. Here, the non-terrestrial network must be able to support an effective link adaptation method even in an environment of large time delay and / or long path attenuation.

[0195] Here, in a non-terrestrial network, the method of retransmitting data after receiving HARQ-ACK feedback may not be efficient in terms of transmission delay and / or resource utilization due to large path attenuation and / or long time delay. Here, in the non-terrestrial network, a method of restoring failed reception data not based on immediate HARQ-ACK feedback, but by restoring it with FEC coding in a higher layer (hereinafter, referred to as first FEC coding) may be considered. For example, the first FEC coding may have the characteristics of LEC (Long Erasure Correction) coding. For example, the first FEC coding may be an effective method of restoring when data reception fails for a long period of time due to transmission path blockage and / or weather change and / or synchronization error in a three-dimensional space. Here, in addition to the first FEC coding, a second FEC coding may be applied in a lower layer (e.g., a physical layer).

[0196] Here, the second FEC coding may be a coding that is basically applied in a lower layer, such as a physical layer that transmits data through an unstable physical medium (e.g., a channel), and the first FEC coding may be a coding that is selectively applied depending on the channel environment, etc. Here, whether or not the first FEC coding is applied may be based on feedback from the terminal. Therefore, in the present disclosure, in a terrestrial and / or non-terrestrial network composed of one or more base stations (or network nodes) and terminals, when the first FEC coding for the first SDU in the upper layer (hereinafter, the first layer) and / or the second FEC coding for the second SDU in the lower layer (hereinafter, the second layer) can be applied, the terminal may request application of the first FEC coding when a specific event occurs and / or a setting / instruction is received from the base station (or network node) in a state where only the second FEC coding is applied.

[0197] The proposed method of the present disclosure has the advantage of enabling the application of a link adaptation method more suitable for long-term delays and / or path attenuation in terrestrial and / or non-terrestrial networks. For example, supporting controllable hierarchical FEC coding according to the present disclosure has the advantage of effectively supporting data restoration even in environments where HARQ-ACK feedback is not used or where terminals frequently experience long periods of inability to receive data.

[0198] The above [Proposal #03] can be applied in combination with other proposed methods(s) to the extent that the proposed actions do not conflict.

[0199] [Proposal #04] In a terrestrial and / or non-terrestrial network composed of one or more base stations (or network nodes) and terminals, when a first FEC coding for a first SDU in an upper layer (hereinafter, a first layer) and / or a second FEC coding for a second SDU in a lower layer (hereinafter, a second layer) can be applied, when the terminal determines that it does not achieve a target error rate (hereinafter, a second target error rate) for the second FEC coding (in the current configuration) (hereinafter, Event A), at least one of the following information can be reported to the base station (or network node).

[0200] (1) Whether the second target error rate for the second FEC coding was not achieved.

[0201] (2) Reporting of measured / predicted error rates for the second FEC coding

[0202] (3) Report the achievable (minimum) error rate for the second FEC coding.

[0203] (4) Request for change of feedback settings related to modulation and / or coding for the second FEC coding.

[0204] (5) (When the 1st FEC coding is not applied) Request to apply the 1st FEC coding

[0205] Here, for example, the terminal reporting may be triggered by a (pre-)defined and / or set and / or instructed by the base station (or network node) or by a (specific) event (pre-)defined and / or set for the terminal. Here, for example, the FEC (Forward Error Correction) coding may mean coding of a forward error correction method. Here, for example, the SDU (Service Data Unit) may mean a data payload to be transmitted to a lower layer or physical medium (for each transmission unit) based on a specific communication layer. Here, for example, the PDU (Protocol Data Unit) may mean data obtained by adding PCI (Protocol Control Information) to an SDU received from an upper layer (for each transmission unit) based on a specific communication layer. Here, for example, the SDU in the lower layer may be a PDU delivered from the upper layer. Here, for example, the first layer may be a MAC layer and / or an RLC layer and / or a PDCP layer. Here, for example, the second layer may be a PHY layer. Here, for example, the second SDU may be a TB (Transport Block). Here, for example, the modulation and / or coding scheme may include information such as modulation order, code rate, and spectral efficiency.For example, the modulation scheme may be OFDM (Orthogonal Frequency Division Multiplexing), DFT-s-OFDM (Discrete Fourier Transform-spread Orthogonal Frequency Division Multiplexing), OCDM (Orthogonal Chirp Division Multiplexing), AFDM (Affine Frequency Division Multiplexing), or OTFS (Orthogonal Time Frequency Space). Here, for example, the modulation and / or coding-related feedback settings may include an MCS table and / or a CQI (Channel Quality Indication) table, etc. Here, for example, the terminal may report to the base station (or network node) whether the target error rate for the first FEC (hereinafter, the first target error rate) is achieved and / or whether the target error rate for the second FEC (hereinafter, the second target error rate) is achieved. Here, for example, when the terminal reports an achievable (minimum) error rate for the second FEC coding, a candidate for the error rate can be predefined and / or configured and / or instructed by the base station (or network node) to the terminal. Here, for example, the first FEC coding application request can also be transmitted according to an event other than Event A and / or a (pre)definition and / or configuration and / or instruction of the base station (or network node). For example, the terminal can request the application of the first FEC coding via a separate channel. Here, for example, the first FEC coding (associated with the first layer) can be inter-TB coding. Here, for example, the second FEC coding (associated with the second layer) can be coding for TB.

[0206] For example, in a non-terrestrial network according to one embodiment of the present disclosure, assume that a base station (or network) can serve ground and / or air terminals based on the non-terrestrial network. For example, in the non-terrestrial network, the base station (or network) can support downlink and / or uplink transmission to ground and / or air terminals via satellite. Here, the downlink and / or uplink channels of the non-terrestrial network may experience significant time delay and / or path attenuation due to the high altitude of the satellite. Here, the non-terrestrial network must be able to support an effective link adaptation method even in an environment of large time delay and / or long path attenuation.

[0207] Here, in a non-terrestrial network, the method of retransmitting data after receiving HARQ-ACK feedback may not be efficient in terms of transmission delay and / or resource utilization due to large path attenuation and / or long time delay. Here, in the non-terrestrial network, a method of restoring failed reception data not based on immediate HARQ-ACK feedback, but by restoring it with FEC coding in a higher layer (hereinafter, referred to as first FEC coding) may be considered. For example, the first FEC coding may have the characteristics of LEC (Long Erasure Correction) coding. For example, the first FEC coding may be an effective method of restoring when data reception fails for a long period of time due to transmission path blockage and / or weather change and / or synchronization error in a three-dimensional space. Here, in addition to the first FEC coding, a second FEC coding may be applied in a lower layer (e.g., a physical layer).

[0208] Here, the second FEC coding may be a coding basically applied in a lower layer, such as a physical layer that transmits data through an unstable physical medium (e.g., a channel). Here, there may be cases where the target error rate of the second FEC coding cannot be achieved due to the large path attenuation characteristic in the non-terrestrial network. Here, if the base station (or network node) supports multiple methods for the second FEC coding-related modulation and / or coding scheme, the terminal may request a change in the modulation and / or coding-related feedback setting for the second FEC coding to request a feedback format more suitable for the current situation. For example, the terminal may perform single-transmission-based modulation and / or coding-based feedback, but in an environment where the SINR is very low, the terminal may perform multiple-transmission-based modulation and / or coding-based feedback. Here, if the terminal determines that the channel environment cannot be overcome by applying the second FEC coding, the terminal may additionally request application of the first FEC coding. Accordingly, in the present disclosure, in a terrestrial and / or non-terrestrial network composed of one or more base stations (or network nodes) and terminals, when a first FEC coding for a first SDU in an upper layer (hereinafter, a first layer) and / or a second FEC coding for a second SDU in a lower layer (hereinafter, a second layer) can be applied, when the terminal determines that it does not achieve a target error rate (hereinafter, a second target error rate) for the second FEC coding (in the current setting) (hereinafter, Event A), at least one of the following information can be reported to the base station (or network node).

[0209] (1) Whether the second target error rate for the second FEC coding was not achieved.

[0210] (2) Reporting of measured / predicted error rates for the second FEC coding

[0211] (3) Report the achievable (minimum) error rate for the second FEC coding.

[0212] (4) Request for change of feedback settings related to modulation and / or coding for the second FEC coding.

[0213] (5) (When the 1st FEC coding is not applied) Request to apply the 1st FEC coding

[0214] The proposed method of the present disclosure has the advantage of enabling the application of a link adaptation method more suitable for long time delays and / or path attenuation in terrestrial and / or non-terrestrial networks. For example, when supporting controllable hierarchical FEC coding according to the present disclosure, FEC coding at the physical layer can be utilized fundamentally, but FEC coding at higher layers can be adaptively supported depending on the required environment. This has the advantage of enabling stable link adaptation while opportunistically minimizing required complexity or transmission delay.

[0215] The above [Proposal #04] can be applied in combination with other proposed methods as long as the proposed actions do not conflict.

[0216] [Proposal #05] In a terrestrial and / or non-terrestrial network consisting of one or more base stations (or network nodes) and terminals, when FEC coding can be applied to SDUs at a specific layer, it can be determined that the target error rate for the FEC coding is not achieved for a specific reference setting if the terminal satisfies at least one or more of the following condition(s).

[0217] (1) The state in which the (observed / estimated) error rate falls below the target error rate occurs (continuously) for a certain number of times and / or at a certain rate and / or for a certain period of time.

[0218] (2) The state in which the (measured) SINR is lower than the (minimum) required SINR for the target error rate occurs (continuously) for a certain number of times and / or at a certain rate and / or for a certain period of time.

[0219] (3) A transmission unit in which data reception is impossible occurs (continuously) a certain number of times and / or at a certain rate and / or for a certain period of time or more.

[0220] (4) The number of invalid slots based on the PDCCH monitoring slot occurs (continuously) for a certain number of times and / or at a certain rate and / or for a certain period of time.

[0221] Here, for example, the terminal reporting may be triggered by a (pre-)defined and / or set and / or instructed by the base station (or network node) or by a (specific) event (pre-)defined and / or set for the terminal. Here, for example, the FEC (Forward Error Correction) coding may mean coding of a forward error correction method. Here, for example, the SDU (Service Data Unit) may mean a data payload to be transmitted to a lower layer or physical medium (for each transmission unit) based on a specific communication layer. Here, for example, the PDU (Protocol Data Unit) may mean data obtained by adding PCI (Protocol Control Information) to an SDU received from an upper layer (for each transmission unit) based on a specific communication layer. Here, for example, the SDU in the lower layer may be a PDU delivered from the upper layer. Here, for example, the first layer may be a MAC layer and / or an RLC layer and / or a PDCP layer. Here, for example, the second layer may be a PHY layer. Here, for example, the second SDU may be a TB (Transport Block). Here, for example, the modulation and / or coding scheme may include information such as modulation order, code rate, and spectral efficiency.For example, the modulation scheme may be OFDM (Orthogonal Frequency Division Multiplexing), DFT-s-OFDM (Discrete Fourier Transform-spread Orthogonal Frequency Division Multiplexing), OCDM (Orthogonal Chirp Division Multiplexing), AFDM (Affine Frequency Division Multiplexing), or OTFS (Orthogonal Time Frequency Space). Here, for example, the modulation and / or coding related feedback setting may include an MCS table and / or a CQI (Channel Quality Indication) table, etc. Here, for example, the specific reference setting may include modulation and / or coding information, which the base station (or network node) may predefine and / or set and / or instruct the terminal. For example, the reference setting may mean a modulation and / or coding scheme with the lowest required SINR. Here, for example, the FEC related observation and / or estimation may be included in a feedback process related to the FEC related modulation and / or coding scheme. Here, for example, the first FEC coding (associated with the first layer) may be inter-TB coding. Here, for example, the second FEC coding (associated with the second layer) may be coding for TB.

[0222] For example, in a non-terrestrial network according to one embodiment of the present disclosure, assume that a base station (or network) can serve ground and / or air terminals based on the non-terrestrial network. For example, in the non-terrestrial network, the base station (or network) can support downlink and / or uplink transmission to ground and / or air terminals via satellite. Here, the downlink and / or uplink channels of the non-terrestrial network may experience significant time delay and / or path attenuation due to the high altitude of the satellite. Here, the non-terrestrial network must be able to support an effective link adaptation method even in an environment of large time delay and / or long path attenuation.

[0223] Here, in a non-terrestrial network, the method of retransmitting data after receiving HARQ-ACK feedback may not be efficient in terms of transmission delay and / or resource utilization due to large path attenuation and / or long time delay. Here, in the non-terrestrial network, a method of restoring failed reception data not based on immediate HARQ-ACK feedback, but by restoring it with FEC coding in a higher layer (hereinafter, referred to as first FEC coding) may be considered. For example, the first FEC coding may have the characteristics of LEC (Long Erasure Correction) coding. For example, the first FEC coding may be an effective method of restoring when data reception fails for a long period of time due to transmission path blockage and / or weather change and / or synchronization error in a three-dimensional space. Here, in addition to the first FEC coding, a second FEC coding may be applied in a lower layer (e.g., a physical layer).

[0224] Here, the second FEC coding may be a coding that is basically applied in a lower layer, such as a physical layer that transmits data through an unstable physical medium (e.g., a channel), and the first FEC coding may be a coding that is selectively applied depending on the channel environment, etc. Here, whether or not the first FEC coding is applied may be based on feedback from the terminal. Here, when requesting application of the first FEC coding, the terminal must be able to determine that it is difficult to achieve a target error rate with the second FEC coding. Therefore, in the present disclosure, in a terrestrial and / or non-terrestrial network composed of one or more base stations (or network nodes) and terminals, when FEC coding can be applied to an SDU in a specific layer, if the terminal satisfies at least one or more of the following condition(s), it may be determined that the target error rate for the FEC coding is not achieved for a specific reference setting.

[0225] (1) The state in which the (observed / estimated) error rate falls below the target error rate occurs (continuously) for a certain number of times and / or at a certain rate and / or for a certain period of time.

[0226] (2) The state in which the (measured) SINR is lower than the (minimum) required SINR for the target error rate occurs (continuously) for a certain number of times and / or at a certain rate and / or for a certain period of time.

[0227] (3) A transmission unit in which data reception is impossible occurs (continuously) a certain number of times and / or at a certain rate and / or for a certain period of time or more.

[0228] (4) The number of invalid slots based on the PDCCH monitoring slot occurs (continuously) for a certain number of times and / or at a certain rate and / or for a certain period of time.

[0229] For example, if the target error rate for the second FEC coding is not achieved for a long period of time, the terminal may determine that the channel environment has changed to an unfavorable environment in the long term and request the application of the first FEC coding, which is the FEC coding in the upper layer. Alternatively, if the terminal fails to receive data due to performing (re)synchronization, etc. at a certain rate or higher within a certain time interval, the terminal may request the application of the first FEC coding, which is the FEC coding in the upper layer.

[0230] The proposed method of the present disclosure has the advantage of allowing for the application of a link adaptation method more suitable for long time delays and / or path attenuation in terrestrial and / or non-terrestrial networks. For example, when supporting controllable hierarchical FEC coding according to the present disclosure, the FEC coding of the physical layer is basically utilized, but when an environment that cannot be overcome with the FEC coding is determined, the application of the upper layer FEC coding can be requested from the base station (or network node). This has the advantage of enabling stable link adaptation while opportunistically minimizing the required complexity or transmission delay.

[0231] The above [Proposal #05] can be applied in combination with other proposed methods as long as the proposed actions do not conflict.

[0232] [Proposal #06] In a terrestrial and / or non-terrestrial network composed of one or more base stations (or network nodes) and terminals, when FEC coding can be applied to SDUs at a specific layer, the terminals can report at least one of the following information as feedback information related to modulation and / or coding schemes for the FEC coding to the base station (or network node).

[0233] (1) Modulation and / or coding method based on a single transmission unit-based transmission format (hereinafter referred to as the first transmission format)

[0234] (2) Modulation and / or coding method based on multiple transmission unit-based transmission format (hereinafter referred to as the second transmission format)

[0235] Here, for example, the terminal reporting may be triggered by a (pre-)defined and / or set and / or instructed by the base station (or network node) or by a (specific) event (pre-)defined and / or set for the terminal. Here, for example, the FEC (Forward Error Correction) coding may mean coding of a forward error correction method. Here, for example, the SDU (Service Data Unit) may mean a data payload to be transmitted to a lower layer or physical medium (for each transmission unit) based on a specific communication layer. Here, for example, the PDU (Protocol Data Unit) may mean data obtained by adding PCI (Protocol Control Information) to an SDU received from an upper layer (for each transmission unit) based on a specific communication layer. Here, for example, the SDU in the lower layer may be a PDU transmitted from the upper layer. Here, for example, the specific layer may be a PHY layer. Here, for example, the SDU may be a TB (Transport Block). Here, for example, the transmission unit may mean a (time axis) transmission unit, and may mean a TTI (Transmission Time Interval) or a slot. Here, for example, the modulation and / or coding scheme may include information such as modulation order, code rate, and spectral efficiency.For example, the modulation scheme may be OFDM (Orthogonal Frequency Division Multiplexing), DFT-s-OFDM (Discrete Fourier Transform-spread Orthogonal Frequency Division Multiplexing), OCDM (Orthogonal Chirp Division Multiplexing), AFDM (Affine Frequency Division Multiplexing), or OTFS (Orthogonal Time Frequency Space). Here, for example, the modulation and / or coding scheme related feedback may mean a modulation and / or coding scheme that achieves a target error rate of the FEC coding. Here, for example, the first transmission format and / or the second transmission format may be one or more, and may be (pre-)defined and / or set and / or indicated by the base station (or network node). Here, for example, the second transmission format may be effective only when a specific modulation and / or coding scheme related feedback setting is applied. For example, the first feedback configuration may include only the first transmission format, and the second feedback configuration may include both the first transmission format and the second transmission format. Here, for example, the second transmission format may include a method in which a (single) TB is divided and transmitted over multiple slots (TB over Multiple Slot, TBoMS). Here, for example, the second transmission format may include a method in which a (single) TB is repeatedly transmitted over multiple slots, and RV (redundancy version) information for each repeated transmission may be (pre-)defined and / or set and / or indicated by the base station (or network node). Here, for example, the RV may mean a method for selecting bit(s) to be transmitted among bit(s) encoded for a (specific) TB.Here, for example, the first FEC coding (associated with the first layer) may be inter-TB coding. Here, for example, the second FEC coding (associated with the second layer) may be coding for TB.

[0236] For example, in a non-terrestrial network according to one embodiment of the present disclosure, assume that a base station (or network) can serve ground and / or air terminals based on the non-terrestrial network. For example, in the non-terrestrial network, the base station (or network) can support downlink and / or uplink transmission to ground and / or air terminals via satellite. Here, the downlink and / or uplink channels of the non-terrestrial network may experience significant time delay and / or path attenuation due to the high altitude of the satellite. Here, the non-terrestrial network must be able to support an effective link adaptation method even in an environment of large time delay and / or long path attenuation.

[0237] Here, in a non-terrestrial network, the method of retransmitting data after receiving HARQ-ACK feedback may not be efficient in terms of transmission delay and / or resource utilization due to large path attenuation and / or long time delay. Here, in the non-terrestrial network, a method of restoring failed reception data not based on immediate HARQ-ACK feedback, but by restoring it with FEC coding in a higher layer (hereinafter, referred to as first FEC coding) may be considered. For example, the first FEC coding may have the characteristics of LEC (Long Erasure Correction) coding. For example, the first FEC coding may be an effective method of restoring when data reception fails for a long period of time due to transmission path blockage and / or weather change and / or synchronization error in a three-dimensional space. Here, in addition to the first FEC coding, a second FEC coding may be applied in a lower layer (e.g., a physical layer).

[0238] Here, the second FEC coding may be a coding basically applied in a lower layer, such as a physical layer that transmits data through an unstable physical medium (e.g., a channel). Here, there may be a case where the target error rate of the second FEC coding cannot be achieved due to the large path attenuation characteristic in the non-terrestrial network. Here, if the base station (or network node) supports multiple schemes for the second FEC coding related modulation and / or coding scheme, the terminal may request a change in the modulation and / or coding related feedback setting for the second FEC coding to request a feedback format more suitable for the current situation. For example, the terminal may perform modulation and / or coding related feedback based on a single transmission unit-based transmission format (hereinafter, the first transmission format), and then perform modulation and / or coding related feedback based on a multiple transmission unit-based transmission format (hereinafter, the second transmission format) in an environment where the SINR becomes very low. Therefore, in the present disclosure, in a terrestrial and / or non-terrestrial network composed of one or more base stations (or network nodes) and terminals, when FEC coding can be applied to an SDU at a specific layer, the terminal can report at least one of the following information as feedback information related to a modulation and / or coding scheme for the FEC coding to the base station (or network node).

[0239] (1) Modulation and / or coding method based on a single transmission unit-based transmission format (hereinafter referred to as the first transmission format)

[0240] (2) Modulation and / or coding method based on multiple transmission unit-based transmission format (hereinafter referred to as the second transmission format)

[0241] For example, the second transmission format may include a method in which a (single) TB is divided and transmitted over multiple slots (TB over Multiple Slot, TBoMS). Alternatively, the second transmission format may include a method in which a (single) TB is repeatedly transmitted over multiple slots, and RV (redundancy version) information for each repeated transmission may be (pre-)defined and / or set and / or indicated by a base station (or network node).

[0242] According to the proposed method of the present disclosure, there is an advantage in that a link adaptation method more suitable for long time delay and / or path attenuation can be applied in terrestrial and / or non-terrestrial networks. For example, if a modulation and / or coding method based on a multiple transmission unit-based transmission format according to the present disclosure is supported, the data payload size within a single transmission unit can be significantly reduced, and the SINR required during demodulation can be greatly reduced, which is advantageous in supporting wide-area coverage in non-terrestrial networks. In addition, there is an advantage in that feedback of the above information can more easily make decisions on repetitive transmission and / or multiple transmission unit-based transmission scheduling at a base station (or network node).

[0243] The above [Proposal #06] can be applied in combination with other proposed methods(s) to the extent that the proposed actions do not conflict.

[0244] [Proposal #07] In a terrestrial and / or non-terrestrial network composed of one or more base stations (or network nodes) and terminals, when FEC coding can be applied to SDUs at a specific layer, the terminals can report at least one of the following information as feedback information related to channel state changes for the FEC coding to the base station (or network node).

[0245] (1) Rate of change and / or change formula and / or change model for path attenuation;

[0246] (2) Change rate and / or change formula and / or change model for SINR;

[0247] (3) Change rate and / or change formula and / or change model for error rate;

[0248] (4) Change rate and / or change formula and / or change model for code rate

[0249] (5) Change rate and / or change formula and / or change model for SE (Spectral Efficiency)

[0250] Here, for example, the terminal reporting may be triggered by a (pre-)defined and / or set and / or instructed by the base station (or network node) or by a (specific) event (pre-)defined and / or set for the terminal. Here, for example, the FEC (Forward Error Correction) coding may mean coding of a forward error correction method. Here, for example, the SDU (Service Data Unit) may mean a data payload to be transmitted to a lower layer or physical medium (for each transmission unit) based on a specific communication layer. Here, for example, the PDU (Protocol Data Unit) may mean data obtained by adding PCI (Protocol Control Information) to an SDU received from an upper layer (for each transmission unit) based on a specific communication layer. Here, for example, the SDU in the lower layer may be a PDU transmitted from the upper layer. Here, for example, the specific layer may be a PHY layer. Here, for example, the SDU may be a TB (Transport Block). Here, for example, the transmission unit may mean a (time axis) transmission unit, and may mean a TTI (Transmission Time Interval) or a slot. Here, for example, the terminal report may be (pre-)defined and / or set and / or instructed by the base station (or network node), or may be triggered by a (specific) event (pre-)defined and / or set to the terminal. Here, for example, the formula and / or model may be (pre-)defined and / or set and / or instructed to the terminal by the base station (or network node). Here, for example, the model may mean an artificial intelligence and / or machine learning model. Here, for example, the first FEC coding (related to the first layer) may be TB-to-TB coding.Here, for example, the second FEC coding (associated with the second layer) may be coding for TB.

[0251] For example, in a non-terrestrial network according to one embodiment of the present disclosure, assume that a base station (or network) can serve ground and / or air terminals based on the non-terrestrial network. For example, in the non-terrestrial network, the base station (or network) can support downlink and / or uplink transmission to ground and / or air terminals via satellite. Here, the downlink and / or uplink channels of the non-terrestrial network may experience significant time delay and / or path attenuation due to the high altitude of the satellite. Here, the non-terrestrial network must be able to support an effective link adaptation method even in an environment of large time delay and / or long path attenuation.

[0252] Here, FEC coding can be applied to a specific layer in a non-terrestrial network. For example, the specific layer can be a physical layer, and the FEC coding can be channel coding for a physical transmission channel. Here, the base station (or network node) can adjust / control the MCS (Modulation and Coding Scheme) related to the FEC coding. For example, a terminal reports channel state information (e.g., CSI) to the base station (or network node), and the base station (or network node) can infer SINR information based on the CSI feedback information of the terminal. Thereafter, the base station (or network node) can correct the SINR through an OLLA process based on the demodulation result feedback information for the data (e.g., HARQ-ACK feedback), and then determine the final MCS based on the corrected effective SINR.

[0253] Here, the CSI information may be reported periodically and / or aperiodically, and aging may occur due to a time delay between the CSI measurement and / or reporting time and the actual application time. Here, the aging phenomenon may be aggravated in a non-terrestrial network with a long time delay characteristic due to the channel environment. In addition, in the non-terrestrial network, HARQ operation may not be operated due to problems of transmission delay and / or reduced efficiency of resource utilization. In this case, the base station (or network node) must perform link adaptation only by relying on the CSI information at the time of feedback, and the utilization of channel capacity may be reduced. Therefore, in the present disclosure, in a terrestrial and / or non-terrestrial network composed of one or more base stations (or network nodes) and a terminal, when FEC coding can be applied to an SDU in a specific layer, the terminal may report at least one of the following information as feedback information related to channel state changes for the FEC coding to the base station (or network node).

[0254] (1) Rate of change and / or change formula and / or change model for path attenuation;

[0255] (2) Change rate and / or change formula and / or change model for SINR;

[0256] (3) Change rate and / or change formula and / or change model for error rate;

[0257] (4) Change rate and / or change formula and / or change model for code rate

[0258] (5) Change rate and / or change formula and / or change model for SE (Spectral Efficiency)

[0259] For example, in a non-terrestrial network, a terminal may additionally feed back a rate of change and / or a change formula and / or a change model for SINR to a base station (or network node). Here, the base station (or network node) may additionally reflect the SINR change amount information to compensate for the SINR derived from conventional CSI information.

[0260] The proposed method of the present disclosure has the advantage of enabling the application of a link adaptation method more suitable for long time delays and / or path attenuation in terrestrial and / or non-terrestrial networks. For example, even in systems where HARQ operation is not in operation, predictable CSI feedback information can be fed back, thereby supporting effective link adaptation by base stations (or network nodes).

[0261] The above [Proposal #07] can be applied in combination with other proposed methods(s) as long as the proposed actions do not conflict.

[0262] [Proposal #08] In a terrestrial and / or non-terrestrial network consisting of one or more base stations (or network nodes) and terminals, when FEC coding can be applied to SDUs at a specific layer, the base station (or network node) can transmit a model and / or model-related settings for OLLA (Open Loop Link Adaptation) to the terminal, and the terminal can apply the OLLA model according to the data demodulation result and feed back a link adaptation correction value to the base station (or network node).

[0263] Here, for example, the terminal reporting may be triggered by a (pre-)defined and / or set and / or instructed by the base station (or network node) or by a (specific) event (pre-)defined and / or set for the terminal. Here, for example, the FEC (Forward Error Correction) coding may mean coding of a forward error correction method. Here, for example, the SDU (Service Data Unit) may mean a data payload to be transmitted to a lower layer or physical medium (for each transmission unit) based on a specific communication layer. Here, for example, the PDU (Protocol Data Unit) may mean data obtained by adding PCI (Protocol Control Information) to an SDU received from an upper layer (for each transmission unit) based on a specific communication layer. Here, for example, the SDU in the lower layer may be a PDU transmitted from the upper layer. Here, for example, the specific layer may be a PHY layer. Here, for example, the SDU may be a TB (Transport Block). Here, for example, the transmission unit may mean a (time axis) transmission unit, and may mean a Transmission Time Interval (TTI) or a slot. Here, for example, the terminal may not report feedback (e.g., HARQ-ACK feedback, etc.) according to the data demodulation result, or may perform delayed reporting for the feedback. Here, for example, the link adaptation correction value may mean a correction value for a modulation scheme and / or a coding scheme and / or an SINR. Here, for example, the first FEC coding (associated with the first layer) may be coding between TBs. Here, for example, the second FEC coding (associated with the second layer) may be coding for TBs.

[0264] For example, in a non-terrestrial network according to one embodiment of the present disclosure, assume that a base station (or network) can serve ground and / or air terminals based on the non-terrestrial network. For example, in the non-terrestrial network, the base station (or network) can support downlink and / or uplink transmission to ground and / or air terminals via satellite. Here, the downlink and / or uplink channels of the non-terrestrial network may experience significant time delay and / or path attenuation due to the high altitude of the satellite. Here, the non-terrestrial network must be able to support an effective link adaptation method even in an environment of large time delay and / or long path attenuation.

[0265] Here, FEC coding can be applied to a specific layer in a non-terrestrial network. For example, the specific layer can be a physical layer, and the FEC coding can be channel coding for a physical transmission channel. Here, the base station (or network node) can adjust / control the MCS (Modulation and Coding Scheme) related to the FEC coding. For example, a terminal reports channel state information (e.g., CSI) to the base station (or network node), and the base station (or network node) can infer SINR information based on the CSI feedback information of the terminal. Thereafter, the base station (or network node) can correct the SINR through an OLLA process based on the demodulation result feedback information for the data (e.g., HARQ-ACK feedback), and then determine the final MCS based on the corrected effective SINR.

[0266] Here, the CSI information may be reported periodically and / or aperiodically, and aging may occur due to the time delay between the CSI measurement and / or reporting time and the actual application time. Here, the aging phenomenon may be aggravated in non-terrestrial networks with long time delay characteristics due to the channel environment. Furthermore, HARQ operation may not be operated in the non-terrestrial network due to issues with transmission delay and / or reduced efficiency in resource utilization. In the above case, the base station (or network node) must perform link adaptation solely based on the CSI information provided at the time of feedback, which may reduce the utilization of channel capacity. Therefore, in the present disclosure, in a terrestrial and / or non-terrestrial network composed of one or more base stations (or network nodes) and terminals, when FEC coding can be applied to SDUs at a specific layer, the base station (or network node) can transmit a model and / or model-related settings for OLLA (Open Loop Link Adaptation) to the terminal, and the terminal can feed back a link adaptation correction value derived by applying the OLLA model according to a data demodulation result to the base station (or network node).

[0267] For example, a base station (or network node) can set / instruct a terminal to set a step size for SINR correction when data demodulation is successful and a step size for SINR adjustment when data demodulation is unsuccessful, and the terminal can accumulate and apply the steps based on the demodulation result. Thereafter, the terminal can report the accumulated SINR correction value to the base station (or network node).

[0268] The proposed method of the present disclosure has the advantage of enabling the application of a link adaptation method more suitable for long time delays and / or path attenuation in terrestrial and / or non-terrestrial networks. For example, even in systems where HARQ operation is not in operation, by performing OLLA operation on the terminal and feeding back accumulated SINR correction values, the base station (or network node) can be supported to perform effective link adaptation.

[0269] The above [Proposal #08] can be applied in combination with other proposed methods(s) to the extent that the proposed actions do not conflict.

[0270] [Proposal #09] In a terrestrial and / or non-terrestrial network composed of one or more base stations (or network nodes) and terminals, when FEC coding can be applied to SDUs at a specific layer, the base station (or network node) can (pre-)define and / or set and / or instruct the terminals to a plurality of error rate candidates related to the FEC coding, and the terminals can report information about an achievable error rate among the error rate candidates to the base station (or network node).

[0271] Here, for example, the terminal reporting may be triggered by a (pre-)defined and / or set and / or instructed by the base station (or network node) or by a (specific) event (pre-)defined and / or set for the terminal. Here, for example, the FEC (Forward Error Correction) coding may mean coding of a forward error correction method. Here, for example, the SDU (Service Data Unit) may mean a data payload to be transmitted to a lower layer or physical medium (for each transmission unit) based on a specific communication layer. Here, for example, the PDU (Protocol Data Unit) may mean data obtained by adding PCI (Protocol Control Information) to an SDU received from an upper layer (for each transmission unit) based on a specific communication layer. Here, for example, the SDU in the lower layer may be a PDU transmitted from the upper layer. Here, for example, the specific layer may be a PHY layer. Here, for example, the SDU may be a TB (Transport Block). Here, for example, the transmission unit may mean a (time axis) transmission unit, and may mean a Transmission Time Interval (TTI) or a slot. Here, for example, the plurality of error rate candidates may be applicable error rate(s) assuming a specific (single) setting related to a modulation and / or coding scheme. Here, for example, the plurality of error rate candidates may be provided to the terminal in the form of a list and / or an interval and / or a range. Here, for example, the achievable error rate may be reported together with associated modulation and / or coding scheme information. Here, for example, the first FEC coding (related to the first layer) may be inter-TB coding.Here, for example, the second FEC coding (associated with the second layer) may be coding for TB.

[0272] For example, in a non-terrestrial network according to one embodiment of the present disclosure, assume that a base station (or network) can serve ground and / or air terminals based on the non-terrestrial network. For example, in the non-terrestrial network, the base station (or network) can support downlink and / or uplink transmission to ground and / or air terminals via satellite. Here, the downlink and / or uplink channels of the non-terrestrial network may experience significant time delay and / or path attenuation due to the high altitude of the satellite. Here, the non-terrestrial network must be able to support an effective link adaptation method even in an environment of large time delay and / or long path attenuation.

[0273] Here, in a non-terrestrial network, the method of retransmitting data after receiving HARQ-ACK feedback may not be efficient in terms of transmission delay and / or resource utilization due to large path attenuation and / or long time delay. Here, in the non-terrestrial network, a method of restoring failed reception data not based on immediate HARQ-ACK feedback, but by restoring it with FEC coding in a higher layer (hereinafter, referred to as first FEC coding) may be considered. For example, the first FEC coding may have the characteristics of LEC (Long Erasure Correction) coding. For example, the first FEC coding may be an effective method of restoring when data reception fails for a long period of time due to transmission path blockage and / or weather change and / or synchronization error in a three-dimensional space. Here, in addition to the first FEC coding, a second FEC coding may be applied in a lower layer (e.g., a physical layer).

[0274] Here, the second FEC coding may be a coding basically applied in a lower layer, such as a physical layer that transmits data through an unstable physical medium (e.g., a channel). Here, there may be cases where the target error rate of the second FEC coding cannot be achieved due to the large path attenuation characteristics in the non-terrestrial network. Here, the base station (or network node) may overcome the limitations of the second FEC coding by applying the first FEC coding. Here, the base station (or network node) may need to know the error rate that the first FEC coding can achieve in the current state in order to determine the coding rate of the first FEC coding. Accordingly, in the present disclosure, in a terrestrial and / or non-terrestrial network composed of one or more base stations (or network nodes) and terminals, when FEC coding can be applied to SDUs in a specific layer, the base station (or network node) can (pre-)define and / or set and / or instruct the terminals to a plurality of error rate candidates related to the FEC coding, and the terminals can report information on an achievable error rate among the error rate candidates to the base station (or network node).

[0275] The proposed method of the present disclosure has the advantage of enabling the application of a link adaptation method more suitable for long time delays and / or path attenuation in terrestrial and / or non-terrestrial networks. For example, when supporting controllable hierarchical FEC coding according to the present disclosure, the current status and / or performance of the second FEC coding in the lower layer can be accurately recognized, and the first FEC coding to complement it can be determined and applied in the upper layer.

[0276] The above [Proposal #09] can be applied in combination with other proposed methods as long as the proposed actions do not conflict.

[0277] [Proposal #10] In a terrestrial and / or non-terrestrial network consisting of one or more base stations (or network nodes) and terminals, when FEC coding can be applied to SDUs at a specific layer, and when the base station (or network node) can adjust the code rate of the FEC coding (e.g., streaming FEC coding), the terminal can report feedback for code rate and / or redundancy control to the base station (or network node) if at least one of the following conditions is satisfied.

[0278] (1) When the actual / predicted code rate is higher than a specific threshold value (hereinafter referred to as the first threshold)

[0279] (2) When the actual / predicted code rate is below a specific threshold (hereinafter referred to as the second threshold)

[0280] (3) When the number of PDUs successfully (or unsuccessfully) received is greater than a specific threshold (hereinafter referred to as the third threshold)

[0281] (4) When the number of PDUs successfully (or unsuccessfully) received is below a specific threshold (hereinafter referred to as the fourth threshold)

[0282] Here, for example, the terminal reporting may be triggered by a (pre-)defined and / or set and / or instructed by the base station (or network node) or by a (specific) event (pre-)defined and / or set for the terminal. Here, for example, the FEC (Forward Error Correction) coding may mean coding of a forward error correction method. Here, for example, the SDU (Service Data Unit) may mean a data payload to be transmitted to a lower layer or physical medium (for each transmission unit) based on a specific communication layer. Here, for example, the PDU (Protocol Data Unit) may mean data obtained by adding PCI (Protocol Control Information) to an SDU received from an upper layer (for each transmission unit) based on a specific communication layer. Here, for example, the SDU in the lower layer may be a PDU delivered from the upper layer. Here, for example, the specific layer may be a MAC layer and / or an RLC layer and / or a PDCP layer. Here, for example, the first threshold and / or the second threshold and / or the third threshold and / or the fourth threshold can be (pre-)defined and / or set and / or instructed by the base station (or network node) to the terminal. Here, for example, the data to which the FEC coding is applied can be composed of a plurality of PDU(s), and the PDU(s) can be divided into a PDU corresponding to the original data (hereinafter, the first PDU) and a PDU corresponding to redundancy (hereinafter, the second PDU). Here, for example, the terminal can measure / predict the coding rate as a ratio between the amount and / or number of original data PDUs (or SDUs) and the total amount and / or number of received PDUs.Here, for example, the feedback for the redundancy control may include a redundancy status report of the terminal and / or a redundancy transmission request, etc. Here, for example, when the terminal determines that decoding of an SDU in a specific layer has been successful, the terminal may feed back related information to the base station (or network node). Here, for example, before the terminal determines that decoding of an SDU in a specific layer has been successful, if the transmission of the associated data (e.g., PDU) for the corresponding SDU has been more than a certain time since a specific data transmission (predefined and / or configured / indicated) and / or if data has not been received for more than a certain time, the terminal may feed back related information to the base station (or network node). For example, the specific transmission may be the most recently received data transmission or a specific data transmission instructed / indicated by the base station (or network node). Here, for example, the first FEC coding (related to the first layer) may be inter-TB coding. Here, for example, the second FEC coding (associated with the second layer) may be coding for TB.

[0283] For example, in a non-terrestrial network according to one embodiment of the present disclosure, assume that a base station (or network) can serve ground and / or air terminals based on the non-terrestrial network. For example, in the non-terrestrial network, the base station (or network) can support downlink and / or uplink transmission to ground and / or air terminals via satellite. Here, the downlink and / or uplink channels of the non-terrestrial network may experience significant time delay and / or path attenuation due to the high altitude of the satellite. Here, the non-terrestrial network must be able to support an effective link adaptation method even in an environment of large time delay and / or long path attenuation.

[0284] Here, in a non-terrestrial network, the method of retransmitting data after receiving HARQ-ACK feedback may not be efficient in terms of transmission delay and / or resource utilization due to large path attenuation and / or long time delay. Here, in the non-terrestrial network, a method of restoring failed reception data not based on immediate HARQ-ACK feedback, but by restoring it with FEC coding in a higher layer (hereinafter, referred to as first FEC coding) may be considered. For example, the first FEC coding may have the characteristics of LEC (Long Erasure Correction) coding. For example, the first FEC coding may be an effective method of restoring when data reception fails for a long period of time due to transmission path blockage and / or weather change and / or synchronization error in a three-dimensional space. Here, in addition to the first FEC coding, a second FEC coding may be applied in a lower layer (e.g., a physical layer).

[0285] Here, the first FEC coding may be a coding type capable of controlling the code rate. For example, it may be a fountain code type. Here, in order for the base station (or network node) to easily control the code rate and / or redundancy of the first FEC coding, it may be desirable to receive related feedback from the terminal. Therefore, in the present disclosure, in a terrestrial and / or non-terrestrial network composed of one or more base stations (or network nodes) and terminals, when FEC coding can be applied to an SDU in a specific layer, when the base station (or network node) can adjust the code rate of the FEC coding (e.g., streaming FEC coding), if the terminal satisfies at least one of the following conditions, the terminal may report feedback for code rate and / or redundancy control to the base station (or network node).

[0286] (1) When the actual / predicted code rate is higher than a specific threshold value (hereinafter referred to as the first threshold)

[0287] (2) When the actual / predicted code rate is below a specific threshold (hereinafter referred to as the second threshold)

[0288] (3) When the number of PDUs successfully (or unsuccessfully) received is greater than a specific threshold (hereinafter referred to as the third threshold)

[0289] (4) When the number of PDUs successfully (or unsuccessfully) received is below a specific threshold (hereinafter referred to as the fourth threshold)

[0290] The proposed method of the present disclosure has the advantage of enabling the application of a link adaptation method more suitable for long time delays and / or path attenuation in terrestrial and / or non-terrestrial networks. For example, when supporting controllable hierarchical FEC coding according to the present disclosure, the first FEC coding can be adaptively determined and applied at a higher layer based on terminal feedback information.

[0291] In a variation of the present disclosure, in a terrestrial and / or non-terrestrial network comprising one or more base stations (or network nodes) and terminals, when FEC coding can be applied to SDUs in a specific layer, when the base station (or network node) can adjust a code rate of the FEC coding (e.g., streaming FEC coding), the base station (or network node) can set / instruct a resource section (hereinafter, a first section) for monitoring the code rate of the FEC coding, and the terminal can report feedback for code rate and / or redundancy control to the base station (or network node) if a result measured within the first section satisfies at least one of the following conditions:

[0292] (1) When the actual / predicted code rate is higher than a specific threshold value (hereinafter referred to as the first threshold)

[0293] (2) When the actual / predicted code rate is below a specific threshold (hereinafter referred to as the second threshold)

[0294] (3) When the number of PDUs successfully (or unsuccessfully) received is greater than a specific threshold (hereinafter referred to as the third threshold)

[0295] (4) When the number of PDUs successfully (or unsuccessfully) received is below a specific threshold (hereinafter referred to as the fourth threshold)

[0296] Here, for example, the base station (or network node) can dynamically instruct and / or adjust the first section via data and / or control signals transmitted and / or semi-statically set it via upper layer signals. Here, for example, when the terminal determines that decoding of an SDU in a specific layer has been successful, the terminal can feed back relevant information to the base station (or network node). Here, for example, before the terminal determines that decoding of an SDU in a specific layer has been successful, if a certain period of time has passed since a specific data transmission (e.g., a PDU) associated with the SDU has been transmitted (predefined and / or configured / indicated) and / or if data has not been received for a certain period of time, the terminal can feed back relevant information to the base station (or network node). For example, the specific transmission can be the most recently received data transmission or a specific data transmission instructed / indicated by the base station (or network node).

[0297] The above [Proposal #10] can be applied in combination with other proposed methods as long as the proposed actions do not conflict.

[0298] [Proposal #11] In a terrestrial and / or non-terrestrial network composed of one or more base stations (or network nodes) and terminals, when FEC coding can be applied to SDUs at a specific layer, and when the base station (or network node) can adjust the code rate of the FEC coding (e.g., streaming FEC coding), the terminal can report at least one of the following information to the base station (or network node) as feedback information for code rate and / or redundancy control.

[0299] (1) Number of PDUs received to date (based on data group with FEC coding applied)

[0300] (2) (Based on data group with FEC coding applied) Current measured / predicted code rate

[0301] (3) (Based on data group with FEC coding applied) Hard / soft ACK information based on PDUs received so far

[0302] (4) (Based on data group with FEC coding applied) Size / amount of redundancy requiring additional transmission

[0303] (5) Information about missed sections received at the terminal end (e.g. (re)synchronization sections, etc.)

[0304] (6) (Based on data group to which FEC coding is applied) Information on the difference between the Soft input value and the Soft output value based on the PDU received so far

[0305] (7) Information on the correspondence between SINR and error rate (e.g., slope information for the SINR vs. error rate function, error reduction rate upon retransmission, etc.)

[0306] (8) Information about the decoding method (e.g., type of receiving algorithm, number of iterations in case of iteration-based decoding, etc.)

[0307] Here, for example, the terminal reporting may be triggered by a (pre-)defined and / or set and / or instructed by the base station (or network node) or by a (specific) event (pre-)defined and / or set for the terminal. Here, for example, the FEC (Forward Error Correction) coding may mean coding of a forward error correction method. Here, for example, the SDU (Service Data Unit) may mean a data payload to be transmitted to a lower layer or physical medium (for each transmission unit) based on a specific communication layer. Here, for example, the PDU (Protocol Data Unit) may mean data obtained by adding PCI (Protocol Control Information) to an SDU received from an upper layer (for each transmission unit) based on a specific communication layer. Here, for example, the SDU in the lower layer may be a PDU delivered from the upper layer. Here, for example, the specific layer may be a MAC layer and / or an RLC layer and / or a PDCP layer. Here, for example, the first threshold and / or the second threshold and / or the third threshold and / or the fourth threshold can be (pre-)defined and / or set and / or instructed by the base station (or network node) to the terminal. Here, for example, the data to which the FEC coding is applied can be composed of a plurality of PDU(s), and the PDU(s) can be divided into a PDU corresponding to the original data (hereinafter, the first PDU) and a PDU corresponding to redundancy (hereinafter, the second PDU). Here, for example, the terminal can measure / predict the coding rate as a ratio between the amount and / or number of original data PDUs (or SDUs) and the total amount and / or number of received PDUs.Here, for example, among the hard / soft ACKs, a hard ACK may indicate whether data demodulation was successful or failed, and a soft ACK may indicate information indicating the probability of whether data demodulation was successful or failed. Here, for example, the first FEC coding (associated with the first layer) may be inter-TB coding. Here, for example, the second FEC coding (associated with the second layer) may be coding for TB.

[0308] For example, in a non-terrestrial network according to one embodiment of the present disclosure, assume that a base station (or network) can serve ground and / or air terminals based on the non-terrestrial network. For example, in the non-terrestrial network, the base station (or network) can support downlink and / or uplink transmission to ground and / or air terminals via satellite. Here, the downlink and / or uplink channels of the non-terrestrial network may experience significant time delay and / or path attenuation due to the high altitude of the satellite. Here, the non-terrestrial network must be able to support an effective link adaptation method even in an environment of large time delay and / or long path attenuation.

[0309] Here, in a non-terrestrial network, the method of retransmitting data after receiving HARQ-ACK feedback may not be efficient in terms of transmission delay and / or resource utilization due to large path attenuation and / or long time delay. Here, in the non-terrestrial network, a method of restoring failed reception data not based on immediate HARQ-ACK feedback, but by restoring it with FEC coding in a higher layer (hereinafter, referred to as first FEC coding) may be considered. For example, the first FEC coding may have the characteristics of LEC (Long Erasure Correction) coding. For example, the first FEC coding may be an effective method of restoring when data reception fails for a long period of time due to transmission path blockage and / or weather change and / or synchronization error in a three-dimensional space. Here, in addition to the first FEC coding, a second FEC coding may be applied in a lower layer (e.g., a physical layer).

[0310] Here, the first FEC coding may be a coding type capable of controlling the code rate. For example, it may be a fountain code type. Here, in order for the base station (or network node) to easily control the code rate and / or redundancy of the first FEC coding, it may be desirable to receive related feedback from the terminal. Therefore, in the present disclosure, in a terrestrial and / or non-terrestrial network composed of one or more base stations (or network nodes) and terminals, when FEC coding can be applied to an SDU in a specific layer, when the base station (or network node) can adjust the code rate of the FEC coding (e.g., streaming FEC coding), the terminal can report at least one of the following information to the base station (or network node) as feedback information for code rate and / or redundancy control.

[0311] (1) Number of PDUs received to date (based on data group with FEC coding applied)

[0312] (2) (Based on data group with FEC coding applied) Current measured / predicted code rate

[0313] (3) (Based on data group with FEC coding applied) Hard / soft ACK information based on PDUs received so far

[0314] (4) (Based on data group with FEC coding applied) Size / amount of redundancy requiring additional transmission

[0315] (5) Information about missed sections received at the terminal end (e.g. (re)synchronization sections, etc.)

[0316] (6) (Based on data group to which FEC coding is applied) Information on the difference between the Soft input value and the Soft output value based on the PDU received so far

[0317] (7) Information on the correspondence between SINR and error rate (e.g., slope information for the SINR vs. error rate function, error reduction rate upon retransmission, etc.)

[0318] (8) Information about the decoding method (e.g., algorithm type, number of iterations in case of iteration-based decoding, etc.)

[0319] The proposed method of the present disclosure has the advantage of enabling the application of a link adaptation method more suitable for long time delays and / or path attenuation in terrestrial and / or non-terrestrial networks. For example, when supporting controllable hierarchical FEC coding according to the present disclosure, the first FEC coding can be adaptively determined and applied at a higher layer based on terminal feedback information.

[0320] The above [Proposal #11] can be applied in combination with other proposed methods as long as the proposed actions do not conflict.

[0321] [Proposal #12] In a terrestrial and / or non-terrestrial network composed of one or more base stations (or network nodes) and terminals, when the base stations (or network nodes) and / or terminals set and / or determine a reference format for CSI (Channel State Information) reporting, the reference format may be set and / or determined according to a coding technique associated with the CSI reporting.

[0322] Here, for example, the reference format for the CSI report and / or the coding scheme associated with the CSI report may be (pre-)defined and / or set and / or instructed by the base station (or network node) or may be triggered by a (specific) event (pre-)defined and / or set to the terminal. Here, for example, the coding scheme associated with the CSI report may be (pre-)defined and / or set and / or instructed. Here, for example, the terminal may change the configuration content of the CSI report according to the associated coding scheme when configuring the CSI report. Here, for example, the first FEC coding (associated with the first layer) may be inter-TB coding. Here, for example, the second FEC coding (associated with the second layer) may be coding for the TB.

[0323] For example, in a non-terrestrial network according to one embodiment of the present disclosure, assume that a base station (or network) can serve ground and / or air terminals based on the non-terrestrial network. For example, in the non-terrestrial network, the base station (or network) can support downlink and / or uplink transmission to ground and / or air terminals via satellite. Here, the downlink and / or uplink channels of the non-terrestrial network may experience significant time delay and / or path attenuation due to the high altitude of the satellite. Here, the non-terrestrial network must be able to support an effective link adaptation method even in an environment of large time delay and / or long path attenuation.

[0324] For example, in a non-terrestrial network, a base station (or network node) and / or a terminal may select and / or apply one or more coding schemes when transmitting data. In this case, feedback information for a link adaptation process may need to vary depending on the coding scheme. For example, the feedback information may be Channel State Information (CSI) reported by the terminal. In relation to the CSI reporting, for example, when the base station (or network node) and / or the terminal sets and / or determines a reference format for CSI (Channel State Information) reporting, the reference format may be set and / or determined according to a coding scheme associated with the CSI reporting.

[0325] According to the proposed method of the present disclosure, there is an advantage in that a link adaptation method more suitable for long time delay and / or path attenuation can be applied in terrestrial and / or non-terrestrial networks.

[0326] The above [Proposal #12] can be applied in combination with other proposed methods as long as the proposed actions do not conflict.

[0327] For example, in embodiments of the present disclosure, the base station or network node may be a satellite. For example, the base station or network node may be a transparent satellite. For example, the base station or network node may be a regenerative satellite.

[0328] The combination of embodiments of the present disclosure may operate in conjunction with each other.

[0329] Various embodiments of the present disclosure may be applied differently depending on the link type (DL, UL, SL), and / or the data type (SIB, groupcast, unicast), and / or the search space type in which the scheduling PDCCH is detected (common search space (CSS), UE-specific search space (USS)), and / or the base station node type, and / or the altitude, and / or the presence or absence of power constraints. For example, a combination of various embodiments of the present disclosure may be applied only when related to SIB transmission.

[0330] FIG. 13 illustrates a method for a first device to perform wireless communication according to an embodiment of the present disclosure. The embodiment of FIG. 13 may be combined with various embodiments of the present disclosure, and some descriptions, functions, procedures, proposals, methods, and / or operations of the embodiments may be omitted.

[0331] Referring to FIG. 13, in step S1310, the first device can obtain information related to a first target error rate associated with a first forward error correction coding for a first layer. In step S1320, the first device can obtain information related to a second target error rate associated with a second forward error correction coding for a second layer. In step S1330, the first device can report first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding based on the information related to the first target error rate and the information related to the second target error rate.

[0332] For example, the first layer may be at least one of a medium access control (MAC) layer, a radio link control (RLC) layer, or a packet data convergence protocol (PDCP) layer. For example, the second layer may be a physical (PHY) layer.

[0333] For example, the first feedback information may include at least one modulation scheme or coding scheme associated with the first target error rate. For example, the second feedback information may include information associated with at least one modulation scheme or coding scheme associated with the second target error rate. For example, the information associated with at least one modulation scheme or coding scheme associated with the first target error rate and the information associated with at least one modulation scheme or coding scheme associated with the second target error rate may be associated with at least one of information associated with a modulation order, information associated with a coding rate, or information associated with spectral efficiency.

[0334] For example, the first feedback information may be based on an average error rate associated with the second forward error correction coding.

[0335] For example, the first device may request application of the first forward error correction coding based on the fact that only the second forward error correction coding has been applied to a transmission block associated with the second layer.

[0336] For example, the second feedback information may be reported based on the second target error rate not being met.

[0337] For example, failure to meet the second target error rate may be based on at least one of an estimated error rate, a signal to noise ratio (SINR), a transmission unit in which data reception is impossible, or an invalid slot associated with a physical downlink control channel (PDCCH) monitoring slot.

[0338] For example, at least one of the first feedback information or the second feedback information may be reported based on a multiple transmission unit based transmission format.

[0339] For example, at least one of the first feedback information or the second feedback information may include feedback information related to a change in a channel state associated with at least one of the first forward error correction coding or the second forward error correction coding.

[0340] For example, the first device may obtain information related to open loop link adaptation. For example, the first device may include a link adaptation correction value in at least one of the first feedback information and the second feedback information based on the information related to open loop link adaptation.

[0341] For example, the information related to at least one of the first target error rate or the second target error rate may include information related to a plurality of target error rate candidates. For example, at least one of the first feedback information or the second feedback information may include information related to an achievable target error rate among the information related to the plurality of target error rate candidates.

[0342] For example, the first feedback information and the second feedback information may include information for controlling at least one of the coding rate and the redundancy based on satisfaction of a condition based on a threshold value related to the coding rate.

[0343] For example, the reference format for reporting channel state information may be associated with at least one of the first forward error correction coding or the second forward error correction coding.

[0344] For example, the modulation scheme may be OFDM (Orthogonal Frequency Division Multiplexing), DFT-s-OFDM (Discrete Fourier Transform-spread Orthogonal Frequency Division Multiplexing), OCDM (Orthogonal Chirp Division Multiplexing), AFDM (Affine Frequency Division Multiplexing), or OTFS (Orthogonal Time Frequency Space).

[0345] For example, the first forward error correction coding for the first layer may be inter-TB coding. For example, the second forward error correction coding for the second layer may be inter-TB coding.

[0346] The above proposed method can be applied to devices according to various embodiments of the present disclosure. First, the processor (102) of the first device (100) can obtain information related to a first target error rate associated with the first forward error correction coding for the first layer (for example, the processor (102) of the first device (100) can control the transceiver (106) to obtain information related to the first target error rate associated with the first forward error correction coding for the first layer). Then, the processor (102) of the first device (100) can obtain information related to a second target error rate associated with the second forward error correction coding for the second layer (for example, the processor (102) of the first device (100) can control the transceiver (106) to obtain information related to the second target error rate associated with the second forward error correction coding for the second layer). And, the processor (102) of the first device (100) can report first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding based on the information related to the first target error rate and the information related to the second target error rate (for example, the processor (102) of the first device (100) can control the transceiver (106) to report first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding based on the information related to the first target error rate and the information related to the second target error rate).

[0347] According to one embodiment of the present disclosure, a first device may be provided. For example, the first device may include at least one transceiver; at least one processor; and at least one memory coupled to the at least one processor and storing instructions. For example, the instructions, when executed by the at least one processor, may cause the first device to: obtain information related to a first target error rate associated with a first forward error correction coding for a first layer; obtain information related to a second target error rate associated with a second forward error correction coding for a second layer; and report, based on the information related to the first target error rate and the information related to the second target error rate, first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding.

[0348] For example, the first layer may be at least one of a medium access control (MAC) layer, a radio link control (RLC) layer, or a packet data convergence protocol (PDCP) layer. For example, the second layer may be a physical (PHY) layer.

[0349] For example, the first feedback information may include at least one modulation scheme or coding scheme associated with the first target error rate. For example, the second feedback information may include information associated with at least one modulation scheme or coding scheme associated with the second target error rate. For example, the information associated with at least one modulation scheme or coding scheme associated with the first target error rate and the information associated with at least one modulation scheme or coding scheme associated with the second target error rate may be associated with at least one of information associated with a modulation order, information associated with a coding rate, or information associated with spectral efficiency.

[0350] For example, the first feedback information may be based on an average error rate associated with the second forward error correction coding.

[0351] For example, the first device may request application of the first forward error correction coding based on the fact that only the second forward error correction coding has been applied to a transmission block associated with the second layer.

[0352] For example, the second feedback information may be reported based on the second target error rate not being met.

[0353] For example, failure to meet the second target error rate may be based on at least one of an estimated error rate, a signal to noise ratio (SINR), a transmission unit in which data reception is impossible, or an invalid slot associated with a physical downlink control channel (PDCCH) monitoring slot.

[0354] For example, at least one of the first feedback information or the second feedback information may be reported based on a multiple transmission unit based transmission format.

[0355] For example, at least one of the first feedback information or the second feedback information may include feedback information related to a change in a channel state associated with at least one of the first forward error correction coding or the second forward error correction coding.

[0356] For example, the first device may obtain information related to open loop link adaptation. For example, the first device may include a link adaptation correction value in at least one of the first feedback information and the second feedback information based on the information related to open loop link adaptation.

[0357] For example, the information related to at least one of the first target error rate or the second target error rate may include information related to a plurality of target error rate candidates. For example, at least one of the first feedback information or the second feedback information may include information related to an achievable target error rate among the information related to the plurality of target error rate candidates.

[0358] For example, the first feedback information and the second feedback information may include information for controlling at least one of the coding rate and the redundancy based on satisfaction of a condition based on a threshold value related to the coding rate.

[0359] For example, the reference format for reporting channel state information may be associated with at least one of the first forward error correction coding or the second forward error correction coding.

[0360] For example, the modulation scheme may be OFDM (Orthogonal Frequency Division Multiplexing), DFT-s-OFDM (Discrete Fourier Transform-spread Orthogonal Frequency Division Multiplexing), OCDM (Orthogonal Chirp Division Multiplexing), AFDM (Affine Frequency Division Multiplexing), or OTFS (Orthogonal Time Frequency Space).

[0361] For example, the first forward error correction coding for the first layer may be inter-TB coding. For example, the second forward error correction coding for the second layer may be inter-TB coding.

[0362] According to one embodiment of the present disclosure, a processing device (configured to control a first device) may be provided. For example, the processing device may include at least one processor; and at least one memory coupled to the at least one processor and storing instructions. For example, the instructions, when executed by the at least one processor, may cause the first device to: obtain information related to a first target error rate associated with a first forward error correction coding for a first layer; obtain information related to a second target error rate associated with a second forward error correction coding for a second layer; and report, based on the information related to the first target error rate and the information related to the second target error rate, first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding.

[0363] According to one embodiment of the present disclosure, a non-transitory computer-readable storage medium having instructions recorded thereon may be provided. For example, the instructions, when executed, may cause a first device to: obtain information related to a first target error rate associated with a first forward error correction coding for a first layer; obtain information related to a second target error rate associated with a second forward error correction coding for a second layer; and report, based on the information related to the first target error rate and the information related to the second target error rate, first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding.

[0364] FIG. 14 illustrates a method for a second device to perform wireless communication according to an embodiment of the present disclosure. The embodiment of FIG. 14 may be combined with various embodiments of the present disclosure, and some descriptions, functions, procedures, proposals, methods, and / or operations of the embodiments may be omitted.

[0365] Referring to FIG. 14, in step S1410, the second device may transmit information related to a first target error rate associated with a first forward error correction coding for the first layer. In step S1420, the second device may transmit information related to a second target error rate associated with a second forward error correction coding for the second layer. In step S1430, the second device may receive first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding based on the information related to the first target error rate and the information related to the second target error rate.

[0366] For example, the first layer may be at least one of a medium access control (MAC) layer, a radio link control (RLC) layer, or a packet data convergence protocol (PDCP) layer. For example, the second layer may be a physical (PHY) layer.

[0367] For example, the first feedback information may include at least one modulation scheme or coding scheme associated with the first target error rate. For example, the second feedback information may include information associated with at least one modulation scheme or coding scheme associated with the second target error rate. For example, the information associated with at least one modulation scheme or coding scheme associated with the first target error rate and the information associated with at least one modulation scheme or coding scheme associated with the second target error rate may be associated with at least one of information associated with a modulation order, information associated with a coding rate, or information associated with spectral efficiency.

[0368] For example, the first feedback information may be based on an average error rate associated with the second forward error correction coding.

[0369] For example, the second device may receive a request for application of the first forward error correction coding based on the fact that only the second forward error correction coding has been applied to a transmission block associated with the second layer.

[0370] For example, the second feedback information may be received based on the second target error rate not being met.

[0371] For example, failure to meet the second target error rate may be based on at least one of an estimated error rate, a signal to noise ratio (SINR), a transmission unit in which data reception is impossible, or an invalid slot associated with a physical downlink control channel (PDCCH) monitoring slot.

[0372] For example, at least one of the first feedback information or the second feedback information may be received based on a multiple transmission unit based transmission format.

[0373] For example, at least one of the first feedback information or the second feedback information may include feedback information related to a change in a channel state associated with at least one of the first forward error correction coding or the second forward error correction coding.

[0374] For example, the second device may transmit information related to open loop link adaptation. For example, a link adaptation correction value based on the information related to open loop link adaptation may be included in at least one of the first feedback information or the second feedback information.

[0375] For example, the information related to at least one of the first target error rate or the second target error rate may include information related to a plurality of target error rate candidates. For example, at least one of the first feedback information or the second feedback information may include information related to an achievable target error rate among the information related to the plurality of target error rate candidates.

[0376] For example, the first feedback information and the second feedback information may include information for controlling at least one of the coding rate and the redundancy based on satisfaction of a condition based on a threshold value related to the coding rate.

[0377] For example, the reference format for reporting channel state information may be associated with at least one of the first forward error correction coding or the second forward error correction coding.

[0378] For example, the modulation scheme may be OFDM (Orthogonal Frequency Division Multiplexing), DFT-s-OFDM (Discrete Fourier Transform-spread Orthogonal Frequency Division Multiplexing), OCDM (Orthogonal Chirp Division Multiplexing), AFDM (Affine Frequency Division Multiplexing), or OTFS (Orthogonal Time Frequency Space).

[0379] For example, the first forward error correction coding for the first layer may be inter-TB coding. For example, the second forward error correction coding for the second layer may be inter-TB coding.

[0380] The above proposed method can be applied to devices according to various embodiments of the present disclosure. First, the processor (202) of the second device (200) can transmit information related to a first target error rate associated with the first forward error correction coding for the first layer (for example, the processor (202) of the second device (200) can control the transceiver (206) to transmit information related to the first target error rate associated with the first forward error correction coding for the first layer). Then, the processor (202) of the second device (200) can transmit information related to a second target error rate associated with the second forward error correction coding for the second layer (for example, the processor (202) of the second device (200) can control the transceiver (206) to transmit information related to the second target error rate associated with the second forward error correction coding for the second layer). And, the processor (202) of the second device (200) can receive first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding based on the information related to the first target error rate and the information related to the second target error rate (for example, the processor (202) of the second device (200) can control the transceiver (206) to receive first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding based on the information related to the first target error rate and the information related to the second target error rate).

[0381] According to one embodiment of the present disclosure, a second device may be provided. For example, the second device may include at least one transceiver; at least one processor; and at least one memory coupled to the at least one processor and storing instructions. For example, the instructions, when executed by the at least one processor, may cause the second device to: transmit information related to a first target error rate associated with a first forward error correction coding for a first layer; transmit information related to a second target error rate associated with a second forward error correction coding for a second layer; and receive, based on the information related to the first target error rate and the information related to the second target error rate, first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding.

[0382] For example, the first layer may be at least one of a medium access control (MAC) layer, a radio link control (RLC) layer, or a packet data convergence protocol (PDCP) layer. For example, the second layer may be a physical (PHY) layer.

[0383] For example, the first feedback information may include at least one modulation scheme or coding scheme associated with the first target error rate. For example, the second feedback information may include information associated with at least one modulation scheme or coding scheme associated with the second target error rate. For example, the information associated with at least one modulation scheme or coding scheme associated with the first target error rate and the information associated with at least one modulation scheme or coding scheme associated with the second target error rate may be associated with at least one of information associated with a modulation order, information associated with a coding rate, or information associated with spectral efficiency.

[0384] For example, the first feedback information may be based on an average error rate associated with the second forward error correction coding.

[0385] For example, the second device may receive a request for application of the first forward error correction coding based on the fact that only the second forward error correction coding has been applied to a transmission block associated with the second layer.

[0386] For example, the second feedback information may be received based on the second target error rate not being met.

[0387] For example, failure to meet the second target error rate may be based on at least one of an estimated error rate, a signal to noise ratio (SINR), a transmission unit in which data reception is impossible, or an invalid slot associated with a physical downlink control channel (PDCCH) monitoring slot.

[0388] For example, at least one of the first feedback information or the second feedback information may be received based on a multiple transmission unit based transmission format.

[0389] For example, at least one of the first feedback information or the second feedback information may include feedback information related to a change in a channel state associated with at least one of the first forward error correction coding or the second forward error correction coding.

[0390] For example, the second device may transmit information related to open loop link adaptation. For example, a link adaptation correction value based on the information related to open loop link adaptation may be included in at least one of the first feedback information or the second feedback information.

[0391] For example, the information related to at least one of the first target error rate or the second target error rate may include information related to a plurality of target error rate candidates. For example, at least one of the first feedback information or the second feedback information may include information related to an achievable target error rate among the information related to the plurality of target error rate candidates.

[0392] For example, the first feedback information and the second feedback information may include information for controlling at least one of the coding rate and the redundancy based on satisfaction of a condition based on a threshold value related to the coding rate.

[0393] For example, the reference format for reporting channel state information may be associated with at least one of the first forward error correction coding or the second forward error correction coding.

[0394] For example, the modulation scheme may be OFDM (Orthogonal Frequency Division Multiplexing), DFT-s-OFDM (Discrete Fourier Transform-spread Orthogonal Frequency Division Multiplexing), OCDM (Orthogonal Chirp Division Multiplexing), AFDM (Affine Frequency Division Multiplexing), or OTFS (Orthogonal Time Frequency Space).

[0395] For example, the first forward error correction coding for the first layer may be inter-TB coding. For example, the second forward error correction coding for the second layer may be inter-TB coding.

[0396] According to one embodiment of the present disclosure, a processing device (configured to control a second device) may be provided. For example, the processing device may include at least one processor; and at least one memory coupled to the at least one processor and storing instructions. For example, the instructions, when executed by the at least one processor, may cause the second device to: transmit information related to a first target error rate associated with a first forward error correction coding for a first layer; transmit information related to a second target error rate associated with a second forward error correction coding for a second layer; and receive, based on the information related to the first target error rate and the information related to the second target error rate, first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding.

[0397] According to one embodiment of the present disclosure, a non-transitory computer-readable storage medium having instructions recorded thereon may be provided. For example, the instructions, when executed, may cause a second device to: transmit information related to a first target error rate associated with a first forward error correction coding for a first layer; transmit information related to a second target error rate associated with a second forward error correction coding for a second layer; and receive, based on the information related to the first target error rate and the information related to the second target error rate, first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding.

[0398] According to the present disclosure, the following effects can be obtained.

[0399] - Since FEC operation of the upper and lower layers can be optimized by considering both the first target error rate and the second target error rate, flexibility in FEC application according to the channel environment of each layer can be secured.

[0400] - Stable data recovery is possible in long-delay environments without performing HARQ-ACK-based retransmission procedures, thereby providing improved quality of service (QoS) even in NTN channel environments with significant path attenuation and Doppler influence.

[0401] - Through feedback information including modulation order, code rate, and spectral efficiency, the base station can efficiently adjust the FEC operation of the upper and lower layers.

[0402] - The present disclosure can be applied as a function to support NTN and terrestrial mixed networks in future 3GPP standards (e.g., 6G WI, Release extension), and can be extended by combining with other configurations such as target error rate non-achievement event reporting, multiple transmission unit-based feedback, and CSI reference format differentiation.

[0403] The various embodiments of the present disclosure may be combined with each other, and some descriptions, functions, procedures, proposals, methods and / or operations of the various embodiments may be omitted.

[0404] The above proposed method can be applied to the device described below. First, the processor (202) of the receiving terminal can set at least one partial bandwidth (e.g., BWP; bandwidth part). Then, the processor (202) of the receiving terminal can control the transceiver (206) of the receiving terminal to receive a physical channel related to terminal-to-terminal communication (e.g., SL communication) and / or a reference signal related to terminal-to-terminal communication (e.g., SL communication) from the transmitting terminal on at least one partial bandwidth (e.g., BWP).

[0405] Below, a description is given of devices to which various embodiments of the present disclosure can be applied.

[0406] Although not limited thereto, the various descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed in this document may be applied to various fields requiring wireless communication / connectivity (e.g., 5G) between devices.

[0407] 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.

[0408] FIG. 15 illustrates a communication system (1) according to one embodiment of the present disclosure. The embodiment of FIG. 15 may be combined with various embodiments of the present disclosure, and some descriptions, functions, procedures, proposals, methods, and / or operations of the embodiments may be omitted.

[0409] Referring to FIG. 15, a communication system (1) to which various embodiments of the present disclosure are applied 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., 5G NR (New RAT), LTE (Long Term Evolution)) 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 device / server (400). 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 vehicle may include an Unmanned Aerial Vehicle (UAV) (e.g., a drone) and / or an Aerial Vehicle (AV) (e.g., an Advanced Air Mobility (AAM)). The XR device may include an Augmented Reality (AR) / Virtual Reality (VR) / Mixed Reality (MR) device, and may be implemented in the form of a Head-Mounted Device (HMD), a Head-Up Display (HUD) equipped in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, etc. The portable device may include a smartphone, a smart pad, a wearable device (e.g., a smart watch, smart glasses), a computer (e.g., a laptop, etc.), etc. The home appliance may include a TV, a refrigerator, a washing machine, etc. The IoT device may include a sensor, a smart meter, etc. For example, a base station and a network may also be implemented as a wireless device, and a specific wireless device (200a) may operate as a base station / network node to other wireless devices.

[0410] Here, the wireless communication technology implemented in the wireless devices (100a to 100f) of the present specification may include not only LTE, NR, and 6G, but also Narrowband Internet of Things for low-power communication. At this time, for example, NB-IoT technology may be an example of LPWAN (Low Power Wide Area Network) technology, and may be implemented with standards such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the above-described names. Additionally or alternatively, the wireless communication technology implemented in the wireless devices (100a to 100f) of the present specification may perform communication based on LTE-M technology. At this time, for example, LTE-M technology may be an example of LPWAN technology, and may be called by various names such as eMTC (enhanced Machine Type Communication). For example, LTE-M technology can be implemented by at least one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and / or 7) LTE M, and is not limited to the above-described names. Additionally or alternatively, the wireless communication technology implemented in the wireless devices (100a to 100f) of the present specification can include at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN) considering low-power communication, and is not limited to the above-described names. For example, ZigBee technology can create personal area networks (PAN) related to small / low-power digital communication based on various standards such as IEEE 802.15.4, and can be called by various names.

[0411] Wireless devices (100a to 100f) can be connected to a network (300) via a base station (200). Artificial Intelligence (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 (400) via the network (300). The network (300) can be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, etc. The wireless devices (100a to 100f) can communicate with each other via the base station (200) / network (300), but can also communicate directly (e.g., sidelink communication) without going through the base station / network. For example, vehicles (100b-1, 100b-2) can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to Everything) communication). In addition, IoT devices (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices (100a to 100f).

[0412] Wireless communication / connection (150a, 150b, 150c) can be established between wireless devices (100a~100f) / base stations (200), and base stations (200) / base stations (200). Here, wireless communication / connection can be achieved through various wireless access technologies (e.g., 5G NR) such as uplink / downlink communication (150a), sidelink communication (150b) (or, D2D communication), and communication between base stations (150c) (e.g., relay, IAB (Integrated Access Backhaul). Through wireless communication / connection (150a, 150b, 150c), wireless devices and base stations / wireless devices, and base stations and base stations can transmit / receive wireless signals to each other. For example, wireless communication / connection (150a, 150b, 150c) can transmit / receive signals through various physical channels. To this end, 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.), and resource allocation processes can be performed based on various proposals of the present disclosure.

[0413] FIG. 16 illustrates a wireless device according to an embodiment of the present disclosure. The embodiment of FIG. 16 may be combined with various embodiments of the present disclosure, and some descriptions, functions, procedures, proposals, methods, and / or operations of the embodiments may be omitted.

[0414] Referring to FIG. 16, the first wireless device (100) and the second wireless device (200) can transmit and receive wireless signals via various wireless access technologies (e.g., LTE, NR). Here, {the first wireless device (100), the second wireless device (200)} can correspond to {the wireless device (100x), the base station (200)} and / or {the wireless device (100x), the wireless device (100x)} of FIG. 15.

[0415] A first wireless device (100) includes one or more processors (102) and one or more memories (104), and may further include one or more transceivers (106) and / or one or more antennas (108). The processor (102) controls the memories (104) and / or the transceivers (106), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (102) may process information in the memory (104) to generate first information / signal, and then transmit a wireless signal including the first information / signal via the transceiver (106). Furthermore, the processor (102) may receive a wireless signal including second information / signal via the transceiver (106), and then store information obtained from signal processing of the second information / signal in the memory (104). The memory (104) may be connected to the processor (102) and may store various information related to the operation of the processor (102). For example, the memory (104) may perform some or all of the processes controlled by the processor (102), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor (102) and the memory (104) may be part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver (106) may be connected to the processor (102) and may transmit and / or receive wireless signals via one or more antennas (108). The transceiver (106) may include a transmitter and / or a receiver. The transceiver (106) 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.

[0416] A second wireless device (200) includes one or more processors (202), one or more memories (204), and may further include one or more transceivers (206) and / or one or more antennas (208). The processor (202) controls the memories (204) and / or the transceivers (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 third information / signals, and then transmit a wireless signal including the third information / signals via the transceivers (206). In addition, the processor (202) may receive a wireless signal including fourth information / signals via the transceivers (206), and then store information obtained from signal processing of the fourth information / signals 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 perform some or all of the processes controlled by the processor (202), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor (202) and the memory (204) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). The transceiver (206) may be connected to the processor (202) and may transmit and / or receive wireless signals via one or more antennas (208). The transceiver (206) may include a transmitter and / or a receiver. The transceiver (206) may be used interchangeably with an RF unit. In the present disclosure, a wireless device may also mean a communication modem / circuit / chip.

[0417] Hereinafter, the hardware elements of the wireless device (100, 200) will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors (102, 202). For example, one or more processors (102, 202) may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors (102, 202) may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) can generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and / or methods disclosed herein, and provide the signals to one or more transceivers (106, 206). One or more processors (102, 202) can receive signals (e.g., baseband signals) from one or more transceivers (106, 206) and obtain PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed herein.

[0418] One or more processors (102, 202) may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. One or more processors (102, 202) may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in one or more processors (102, 202). The descriptions, functions, procedures, proposals, methods, and / or operational 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, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software configured to perform one or more processors (102, 202) or stored in one or more memories (104, 204) and executed by one or more processors (102, 202). The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions and / or sets of instructions.

[0419] One or more memories (104, 204) may be coupled to one or more processors (102, 202) and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. The one or more memories (104, 204) may be configured as ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. The one or more memories (104, 204) may be located internally and / or externally to the one or more processors (102, 202). Additionally, the one or more memories (104, 204) may be coupled to the one or more processors (102, 202) via various technologies, such as wired or wireless connections.

[0420] One or more transceivers (106, 206) can transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or flowcharts of this document, to one or more other devices. One or more transceivers (106, 206) can receive user data, control information, wireless signals / channels, etc., as mentioned in the descriptions, functions, procedures, proposals, methods and / or flowcharts of this document, from one or more other devices. For example, one or more transceivers (106, 206) can be connected to one or more processors (102, 202) and can transmit and receive wireless signals. For example, one or more processors (102, 202) can control one or more transceivers (106, 206) to transmit user data, control information, or wireless signals to one or more other devices. Additionally, one or more processors (102, 202) may control one or more transceivers (106, 206) to receive user data, control information, or wireless signals from one or more other devices. Additionally, one or more transceivers (106, 206) may be coupled to one or more antennas (108, 208), and one or more transceivers (106, 206) may be configured to transmit and receive user data, control information, wireless signals / channels, or the like, as referred to in the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein, via one or more antennas (108, 208). In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers (106, 206) can convert received user data, control information, 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 one or more processors (102, 202).One or more transceivers (106, 206) may convert user data, control information, wireless signals / channels, etc. processed by one or more processors (102, 202) from baseband signals to RF band signals. For this purpose, one or more transceivers (106, 206) may include an (analog) oscillator and / or filter.

[0421] Fig. 17 illustrates a signal processing circuit for a transmission signal according to an embodiment of the present disclosure. The embodiment of Fig. 17 may be combined with various embodiments of the present disclosure, and some descriptions, functions, procedures, proposals, methods, and / or operations of the embodiments may be omitted.

[0422] Referring to FIG. 17, the signal processing circuit (1000) may include a scrambler (1010), a modulator (1020), a layer mapper (1030), a precoder (1040), a resource mapper (1050), and a signal generator (1060). Although not limited thereto, the operations / functions of FIG. 17 may be performed in the processor (102, 202) and / or the transceiver (106, 206) of FIG. 16. The hardware elements of FIG. 17 may be implemented in the processor (102, 202) and / or the transceiver (106, 206) of FIG. 16. For example, blocks 1010 to 1060 may be implemented in the processor (102, 202) of FIG. 16. Additionally, blocks 1010 to 1050 may be implemented in the processor (102, 202) of FIG. 16, and block 1060 may be implemented in the transceiver (106, 206) of FIG. 16.

[0423] The codeword can be converted into a wireless signal through the signal processing circuit (1000) of FIG. 17. Here, the codeword is an encoded bit sequence of an information block. The information block may include a transport block (e.g., an UL-SCH transport block, a DL-SCH transport block). The wireless signal may be transmitted through various physical channels (e.g., a PUSCH or a PDSCH).

[0424] Specifically, the codeword can be converted into a bit sequence scrambled by a scrambler (1010). 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 can be modulated into a modulation symbol sequence by a modulator (1020). The modulation method may include pi / 2-BPSK (pi / 2-Binary Phase Shift Keying), m-PSK (m-Phase Shift Keying), m-QAM (m-Quadrature Amplitude Modulation), etc. The complex modulation symbol sequence can be mapped to one or more transmission layers by a layer mapper (1030). The modulation symbols of each transmission layer can be mapped to the corresponding antenna port(s) by a precoder (1040) (precoding). The output z of the precoder (1040) can be obtained by multiplying the output y of the layer mapper (1030) by a precoding matrix W of N*M. Here, N is the number of antenna ports, and M is the number of transmission layers. Here, the precoder (1040) can perform precoding after performing transform precoding (e.g., DFT transform) on complex modulation symbols. In addition, the precoder (1040) can perform precoding without performing transform precoding.

[0425] The resource mapper (1050) 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 (1060) 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 (1060) can include an Inverse Fast Fourier Transform (IFFT) module, a Cyclic Prefix (CP) inserter, a Digital-to-Analog Converter (DAC), a frequency uplink converter, etc.

[0426] The signal processing process for receiving signals in a wireless device can be configured in reverse order of the signal processing process (1010 to 1060) of FIG. 17. For example, a wireless device (e.g., 100, 200 of FIG. 16) can receive wireless signals from the outside through an antenna port / transceiver. The received wireless signals can be converted into baseband signals through a signal restorer. For this purpose, the signal restorer can 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 can be restored to a codeword through a resource demapper process, a postcoding process, a demodulation process, and a descrambling process. The codewords can be restored to the original information blocks through decoding. Accordingly, a signal processing circuit (not shown) for a received signal may include a signal restorer, a resource de-mapper, a postcoder, a demodulator, a de-scrambler, and a decoder.

[0427] Figure 18 illustrates a wireless device according to an embodiment of the present disclosure. The wireless device may be implemented in various forms depending on the use case / service (see Figure 15). The embodiment of Figure 18 may be combined with various embodiments of the present disclosure, and some descriptions, functions, procedures, proposals, methods, and / or operations of the embodiments may be omitted.

[0428] Referring to FIG. 18, the wireless device (100, 200) corresponds to the wireless device (100, 200) of FIG. 16 and may be composed of various elements, components, units / units, and / or modules. For example, the wireless device (100, 200) may include a communication unit (110), a control unit (120), a memory unit (130), and additional elements (140). The communication unit may include a communication circuit (112) and a transceiver(s) (114). For example, the communication circuit (112) may include one or more processors (102, 202) and / or one or more memories (104, 204) of FIG. 16. For example, the transceiver(s) (114) may include one or more transceivers (106, 206) and / or one or more antennas (108, 208) of FIG. 16. The control unit (120) is electrically connected to the communication unit (110), the memory unit (130), and the additional elements (140) and controls the overall operation of the wireless device. For example, the control unit (120) may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit (130). In addition, the control unit (120) may transmit information stored in the memory unit (130) to an external device (e.g., another communication device) via a wireless / wired interface through the communication unit (110), or store information received from an external device (e.g., another communication device) via a wireless / wired interface in the memory unit (130).

[0429] The additional element (140) may be configured in various ways depending on the type of the wireless device. For example, the additional element (140) 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. 15, 100a), a vehicle (Fig. 15, 100b-1, 100b-2), an XR device (Fig. 15, 100c), a portable device (Fig. 15, 100d), a home appliance (Fig. 15, 100e), an IoT device (Fig. 15, 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. 15, 400), a base station (Fig. 15, 200), a network node, etc. Wireless devices may be mobile or stationary depending on the use / service.

[0430] In FIG. 18, various elements, components, units / parts, and / or modules within the wireless device (100, 200) may be interconnected entirely via a wired interface, or at least some may be wirelessly connected via a communication unit (110). For example, within the wireless device (100, 200), the control unit (120) and the communication unit (110) may be wired, and the control unit (120) and the first unit (e.g., 130, 140) may be wirelessly connected via the communication unit (110). In addition, each element, component, unit / part, and / or module within the wireless device (100, 200) may further include one or more elements. For example, the control unit (120) may be composed of one or more processor sets. For example, the control unit (120) 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 a random access memory (RAM), a dynamic RAM (DRAM), a read only memory (ROM), a flash memory, a volatile memory, a non-volatile memory, and / or a combination thereof.

[0431] Below, the implementation example of Fig. 18 is described in more detail with reference to the drawings.

[0432] FIG. 19 illustrates a mobile device according to an embodiment of the present disclosure. The mobile device may include a smartphone, a smart pad, a wearable device (e.g., a smartwatch, smartglasses), or a portable computer (e.g., a laptop, etc.). The mobile device may be referred to as a Mobile Station (MS), a User Terminal (UT), a Mobile Subscriber Station (MSS), a Subscriber Station (SS), an Advanced Mobile Station (AMS), or a Wireless Terminal (WT). The embodiment of FIG. 19 may be combined with various embodiments of the present disclosure, and some descriptions, functions, procedures, proposals, methods, and / or operations of the embodiments may be omitted.

[0433] Referring to FIG. 19, the portable device (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a memory unit (130), a power supply unit (140a), an interface unit (140b), and an input / output unit (140c). The antenna unit (108) may be configured as a part of the communication unit (110). Blocks 110 to 130 / 140a to 140c correspond to blocks 110 to 130 / 140 of FIG. 18, respectively.

[0434] The communication unit (110) can transmit and receive signals (e.g., data, control signals, etc.) with other wireless devices and base stations. The control unit (120) can control components of the mobile device (100) to perform various operations. The control unit (120) can include an AP (Application Processor). The memory unit (130) can store data / parameters / programs / codes / commands required for operating the mobile device (100). In addition, the memory unit (130) can store input / output data / information, etc. The power supply unit (140a) supplies power to the mobile device (100) and can include a wired / wireless charging circuit, a battery, etc. The interface unit (140b) can support connection between the mobile device (100) and other external devices. The interface unit (140b) can include various ports (e.g., audio input / output ports, video input / output ports) for connection with external devices. The input / output unit (140c) can input or output video information / signals, audio information / signals, data, and / or information input from a user. The input / output unit (140c) may include a camera, a microphone, a user input unit, a display unit (140d), a speaker, and / or a haptic module.

[0435] For example, in the case of data communication, the input / output unit (140c) 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 (130). The communication unit (110) 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 (110) 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 (130) and then output in various forms (e.g., text, voice, image, video, haptic) through the input / output unit (140c).

Claims

1. In the method, A step of a first device obtaining information related to a first target error rate associated with a first forward error correction coding for a first layer; A step in which the first device obtains information related to a second target error rate associated with a second forward error correction coding for the second layer; and A method comprising: a step of reporting, by the first device, first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding based on information related to the first target error rate and information related to the second target error rate.

2. In paragraph 1, The first layer is at least one of a MAC (medium access control) layer, an RLC (radio link control) layer, or a PDCP (packet data convergence protocol) layer, and The above second layer is a PHY (physical) layer.

3. In paragraph 1, The first feedback information includes at least one of a modulation method or a coding method related to the first target error rate, The second feedback information includes information related to at least one of a modulation method or a coding method related to the second target error rate, and A method wherein information related to at least one of a modulation scheme or a coding scheme related to the first target error rate and information related to at least one of a modulation scheme or a coding scheme related to the second target error rate are related to at least one of information related to a modulation order, information related to a coding rate, or information related to spectral efficiency.

4. In paragraph 1, A method wherein the first feedback information is based on an average error rate associated with the second forward error correction coding.

5. In paragraph 1, A method further comprising: a step of requesting application of a first forward error correction coding based on the fact that only the second forward error correction coding has been applied to a transmission block associated with the second layer; 6. In paragraph 1, A method wherein the second feedback information is reported based on the failure of the second target error rate to be met.

7. In paragraph 6, A method wherein the failure to meet the second target error rate is based on at least one of an estimated error rate, a signal to noise ratio (SINR), a transmission unit in which data reception is impossible, or an invalid slot associated with a physical downlink control channel (PDCCH) monitoring slot.

8. In paragraph 1, A method wherein at least one of the first feedback information or the second feedback information is reported based on a multiple transmission unit based transmission format.

9. In paragraph 1, A method, wherein at least one of the first feedback information or the second feedback information includes feedback information related to a change in a channel state associated with at least one of the first forward error correction coding or the second forward error correction coding.

10. In paragraph 1, The first device obtains information related to open loop link adaptation; and A method further comprising: a step of the first device including a link adaptation correction value in at least one of the first feedback information or the second feedback information based on information related to the open loop link adaptation; 11. In paragraph 1, The information related to at least one of the first target error rate or the second target error rate includes information related to a plurality of target error rate candidates, and A method wherein at least one of the first feedback information or the second feedback information includes information related to a target error rate that can be met among information related to the plurality of target error rate candidates.

12. In paragraph 1, The first feedback information and the second feedback information include information for controlling at least one of the coding rate and the redundancy based on satisfaction of a condition based on a threshold value related to the coding rate, and A method wherein the reference format for reporting channel state information is associated with at least one of the first forward error correction coding or the second forward error correction coding.

13. In paragraph 1, The first forward error correction coding for the first layer is TB (transport block) inter-coding, and A method wherein the second forward error correction coding for the second layer is coding for TB.

14. In the first device, At least one transmitter / receiver; at least one processor; and At least one memory connected to said at least one processor and storing instructions, said instructions being executed by said at least one processor, wherein said first device causes: Obtain information related to a first target error rate associated with the first forward error correction coding for the first layer; Obtain information related to a second target error rate associated with a second forward error correction coding for the second layer; and A first device that reports first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding based on information related to the first target error rate and information related to the second target error rate.

15. In the processing device, at least one processor; and At least one memory connected to said at least one processor and storing instructions, said instructions being executed by said at least one processor, wherein said first device causes: Obtain information related to a first target error rate associated with the first forward error correction coding for the first layer; Obtain information related to a second target error rate associated with a second forward error correction coding for the second layer; and A processing device that reports first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding based on information related to the first target error rate and information related to the second target error rate.

16. A non-transitory computer-readable storage medium that records commands, The above commands, when executed, cause the first device to: Obtain information related to a first target error rate associated with the first forward error correction coding for the first layer; Obtain information related to a second target error rate associated with a second forward error correction coding for the second layer; and A non-transitory computer-readable storage medium that reports first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding based on information related to the first target error rate and information related to the second target error rate.

17. In the method, A step in which a second device transmits information related to a first target error rate associated with a first forward error correction coding for a first layer; A step in which the second device transmits information related to a second target error rate associated with a second forward error correction coding for the second layer; and A method comprising: a step of receiving, by the second device, first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding based on information related to the first target error rate and information related to the second target error rate.

18. In the second device, At least one transmitter / receiver; at least one processor; and At least one memory connected to said at least one processor and storing instructions, said instructions being executed by said at least one processor, wherein said second device causes: Transmit information related to a first target error rate associated with a first forward error correction coding for the first layer; Transmitting information related to a second target error rate associated with a second forward error correction coding for the second layer; and A second device that receives first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding based on information related to the first target error rate and information related to the second target error rate.

19. In the processing device, at least one processor; and At least one memory connected to said at least one processor and storing instructions, said instructions being executed by said at least one processor, wherein said second device causes: Transmit information related to a first target error rate associated with a first forward error correction coding for the first layer; Transmitting information related to a second target error rate associated with a second forward error correction coding for the second layer; and A processing device that receives first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding based on information related to the first target error rate and information related to the second target error rate.

20. A non-transitory computer-readable storage medium that records commands, The above commands, when executed, cause the second device to: Transmit information related to a first target error rate associated with a first forward error correction coding for the first layer; Transmitting information related to a second target error rate associated with a second forward error correction coding for the second layer; and A non-transitory computer-readable storage medium that receives first feedback information related to the first forward error correction coding and second feedback information related to the second forward error correction coding based on information related to the first target error rate and information related to the second target error rate.

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