Method and apparatus for configuring available HARQ processes for logical channels

Abstract

This disclosure relates to 5G or 6G communication systems for supporting higher data transmission rates. According to embodiments of this disclosure, a method performed by a terminal in the communication system is provided. The method performed by the terminal includes the following steps: receiving logical channel configuration information and serving cell configuration information from a base station, the logical channel configuration information including first information relating to available Hybrid Automatic Repeat Request (HARQ) modes corresponding to the logical channel, and the serving cell configuration information including second information relating to available HARQ modes for each HARQ process ID; performing a logical channel prioritization process based on the first and second information; and transmitting uplink data to the base station based on the result of the logical channel prioritization process.

Description

Technical Field

[0001] This disclosure relates to the operation of terminals and base stations in mobile communication systems. More specifically, this disclosure relates to the operation of terminals and base stations in mobile communication systems related to the Hybrid Automatic Repeat Request (HARQ) process. Background Technology

[0002] 5G mobile communication technology defines a wide frequency band, enabling high transmission rates and new services. It can be implemented not only in "sub-6GHz" bands such as 3.5GHz, but also in "above 6GHz" bands, including 28GHz and 39GHz, known as millimeter waves. Furthermore, 6G mobile communication technology (referred to as "super 5G systems") is being considered in terahertz bands (e.g., the 95GHz to 3THz band) to achieve transmission rates up to 50 times faster than 5G and ultra-low latency one-tenth that of 5G.

[0003] In the initial stages of 5G mobile communication technology, to support services and meet performance requirements for enhanced mobile broadband (eMBB), ultra-reliable and low-latency communication (URLLC), and massive machine-type communication (mMTC), the following technologies have been standardized: beamforming and massive MIMO to mitigate radio wave path loss and increase radio wave transmission distance in millimeter waves; parameter sets for dynamic operation (e.g., operating multiple subcarrier spacings) to efficiently utilize millimeter wave resources and time slot formats; initial access technologies to support multi-beam transmission and broadband; the definition and operation of BWP (bandwidth portion); new channel coding methods such as LDPC (low-density parity-check) codes for high-capacity data transmission and polar codes for highly reliable transmission of control information; L2 preprocessing; and network slicing for providing dedicated networks tailored to specific services.

[0004] Currently, considering the services supported by 5G mobile communication technology, discussions are underway regarding improvements and performance enhancements to the initial 5G mobile communication technology. Physical layer standardization has been implemented for technologies such as V2X, which assists autonomous vehicles in making driving decisions based on information about the vehicle's location and status to enhance user convenience; NR-U (Unlicensed New Radio), designed to comply with various regulatory requirements in unlicensed frequency bands; NR UE power saving; and Non-Terrestrial Networks (NTNs), which facilitate direct satellite communication between UEs in areas where communication with terrestrial networks is not possible.

[0005] Furthermore, in the field of wireless interface architecture / protocols, standardization is underway for technologies such as: Industrial Internet of Things (IIOT) for supporting new services through interoperability and convergence with other industries; Integrated Access and Backhaul (IAB) for providing nodes for network service area extension by comprehensively supporting wireless backhaul and access links; mobility enhancements including conditional handover and DAPS (Dual Active Stack) handover; and two-step random access (NR two-step RACH) for simplifying the random access process. Standardization is also being carried out for system architecture / service fields related to: 5G baseline architectures (e.g., service-based architectures or service-based interfaces) for combining Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies; and Mobile Edge Computing (MEC) for receiving services based on UE location.

[0006] If such a 5G mobile communication system is commercialized, the already exponentially increasing number of connected devices will be connected to the communication network, and therefore, enhanced functionality and performance of the 5G mobile communication system, as well as integrated operation of connected devices, are expected to be necessary. To this end, new research related to extended reality (XR) is being orchestrated by leveraging artificial intelligence (AI) and machine learning (ML), AI service support, metaverse service support, and drone communications to effectively support AR, VR, etc. (XR = AR + VR + MR), 5G performance improvements, and reduced complexity.

[0007] Furthermore, this development of 5G mobile communication systems will not only serve as the foundation for developing new waveforms to ensure terahertz band coverage for 6G mobile communication technologies, full-dimensional MIMO (FD-MIMO), multi-antenna transmission technologies such as array antennas and massive MIMO, metamaterial-based lenses and antennas for improved terahertz band signal coverage, high-dimensional spatial multiplexing technologies using OAM (orbital angular momentum), and RIS (reconfigurable smart surfaces), but also for developing full-duplex technologies to improve the frequency efficiency of 6G mobile communication technologies and enhance system networks, AI-based communication technologies that leverage satellites and AI from the design phase and internalize end-to-end AI support functions to achieve system optimization, and services that utilize ultra-high-performance communication and computing resources to achieve next-generation distributed computing technologies with complexity exceeding the operational capabilities of UEs.

[0008] The above information is presented as background information only to aid in understanding this disclosure. No determination or assertion is made regarding whether any of the above content can be considered applicable prior art to this disclosure. Summary of the Invention

[0009] [Technical Issues]

[0010] Various embodiments of the present invention will provide a method for configuring a usable HARQ process for a logical channel and a device capable of performing the method.

[0011] [Solution to the problem]

[0012] According to embodiments of this disclosure, a method for a terminal in a communication system is provided. The terminal method includes: receiving logical channel configuration information and serving cell configuration information from a base station, the logical channel configuration information including first information related to available Hybrid Automatic Repeat Request (HARQ) modes corresponding to the logical channel, and the serving cell configuration information including second information related to available HARQ modes for each HARQ process ID; performing a logical channel prioritization process based on the first and second information; and transmitting uplink data to the base station based on the result of the logical channel prioritization process.

[0013] According to embodiments of this disclosure, a method for a base station in a communication system is provided. The method includes: sending logical channel configuration information and serving cell configuration information to a terminal, the logical channel configuration information including first information relating to available Hybrid Automatic Repeat Request (HARQ) modes corresponding to the logical channel, and the serving cell configuration information including second information relating to available HARQ modes for each HARQ process ID; and receiving uplink data from the terminal, wherein the first and second information are used in a logical channel prioritization process, and the uplink data is based on the result of the logical channel prioritization process.

[0014] According to an embodiment of the present invention, a terminal for a communication system is provided. The terminal includes: a transceiver; and a controller connected to the transceiver and configured to: receive logical channel configuration information and serving cell configuration information from a base station, the logical channel configuration information including first information related to available Hybrid Automatic Repeat Request (HARQ) modes corresponding to the logical channel, and the serving cell configuration information including second information related to available HARQ modes for each HARQ process ID; perform a logical channel prioritization process based on the first and second information; and transmit uplink data to the base station based on the result of the logical channel prioritization process.

[0015] According to an embodiment of the present invention, a base station for a communication system is provided. The base station includes: a transceiver; and a controller connected to the transceiver and configured to: send logical channel configuration information and serving cell configuration information to a terminal, the logical channel configuration information including first information related to the available Hybrid Automatic Repeat Request (HARQ) mode corresponding to the logical channel, and the serving cell configuration information including second information related to the available HARQ mode for each HARQ process ID; and receive an uplink channel from the terminal, wherein the first and second information are used for a logical channel prioritization process, and wherein uplink data is based on the result of the logical channel prioritization process.

[0016] [Beneficial effects of the invention]

[0017] According to various embodiments of this disclosure, a method for configuring an available HARQ process for a logical channel and an apparatus capable of performing the method are provided.

[0018] According to embodiments of this disclosure, a terminal can receive a configuration of available (permitted) HARQ processes for each logical channel and can transmit data through the available HARQ processes in each logical channel. Furthermore, data retransmission can be performed as long as latency requirements are met. Therefore, communication can be performed efficiently even in communication systems with long propagation delays, such as non-terrestrial networks (NTNs).

[0019] The beneficial effects that can be obtained from this disclosure may not be limited to those described above, and other effects not mentioned may be clearly understood by those skilled in the art to which this disclosure pertains from the following description. Attached Figure Description

[0020] The above and other objects, features and advantages of this disclosure will become more apparent from the following description of embodiments of this disclosure with reference to the accompanying drawings.

[0021] Figure 1 The structure of an NTN according to an embodiment of the present disclosure is shown;

[0022] Figure 2 An example of retransmission delay occurring during uplink retransmission in an NTN according to an embodiment of this disclosure is shown;

[0023] Figure 3 A method for applying logical channel prioritization (LCP) constraints according to embodiments of the present disclosure is illustrated;

[0024] Figure 4 A method for applying LCP restrictions according to embodiments of the present disclosure is shown;

[0025] Figure 5A method for applying LCP restrictions according to embodiments of the present disclosure is shown;

[0026] Figure 6 A method for applying LCP restrictions according to embodiments of the present disclosure is shown;

[0027] Figure 7 A method for applying LCP restrictions according to embodiments of the present disclosure is shown;

[0028] Figure 8 A method for applying LCP restrictions according to embodiments of the present disclosure is shown;

[0029] Figure 9 An example of instructing uplink retransmissions based on terminal capabilities in an NTN according to an embodiment of the present disclosure is shown;

[0030] Figure 10 The structure of a terminal according to an embodiment of the present disclosure is shown; and

[0031] Figure 11 The structure of a base station according to an embodiment of the present invention is shown. Detailed Implementation

[0032] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In describing embodiments of the present disclosure, descriptions related to techniques well known in the art and not directly associated with the present disclosure will be omitted. This omission of unnecessary descriptions is intended to prevent confusion with the main ideas of the present disclosure and to convey those main ideas more clearly.

[0033] For the same reason, some elements may be exaggerated, omitted, or shown schematically in the accompanying drawings. Furthermore, the dimensions of each element do not perfectly reflect the actual dimensions. In the drawings, identical or corresponding elements have the same reference numerals.

[0034] The advantages and features of this disclosure, as well as the ways in which they are implemented, will be apparent from the embodiments described in detail below with reference to the accompanying drawings. However, this disclosure is not limited to the embodiments set forth below, but can be implemented in a variety of different forms. The following embodiments are provided only to fully disclose this disclosure and to inform those skilled in the art of its scope, and this disclosure is limited only by the scope of the appended claims. Throughout the specification, the same or similar reference numerals denote the same or similar elements.

[0035] In the following description, a base station is an entity that allocates resources to a terminal and can be at least one of a gNode B, eNode B, Node B, base station (BS), radio access unit, base station controller, and node on a network. A terminal can include a user equipment (UE), mobile station (MS), cellular phone, smartphone, computer, or multimedia system capable of performing communication functions. In this disclosure, "downlink (DL)" refers to a radio link through which a base station transmits signals to a terminal, and "uplink (UL)" refers to a radio link through which a terminal transmits signals to a base station. Furthermore, while LTE or LTE-A systems may be described by example in the following description, embodiments of this disclosure can also be applied to other communication systems with similar technical backgrounds or channel types. Examples of such communication systems may include fifth-generation mobile communication technologies (5G, New Radio, and NR) developed in addition to LTE-A, and in the following description, "5G" can be a concept covering existing LTE, LTE-A, or other similar services. Moreover, based on decisions made by those skilled in the art, embodiments of this disclosure can also be applied to other communication systems with modifications without significantly departing from the scope of this disclosure.

[0036] Here it will be understood that each block of a flowchart, and combinations of blocks within a flowchart, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more flowchart blocks. These computer program instructions can also be stored in a computer-usable or computer-readable storage medium that can direct the computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-usable or computer-readable storage medium produce an article of writing including instruction means for implementing the functions specified in the flowchart blocks or blocks. The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus, thereby producing a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowchart blocks.

[0037] Furthermore, each block of the flowchart can represent a module, segment, or section of code, which includes one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions recorded in a block can occur out of order. For example, two blocks shown consecutively may actually execute substantially simultaneously, or these blocks may sometimes execute in reverse order, depending on the functions involved.

[0038] As used in the embodiments of this disclosure, "unit" refers to a software or hardware element that performs a predetermined function, such as a field-programmable gate array (FPGA) or application-specific integrated circuit (ASIC). However, "unit" is not always limited to software or hardware. A "unit" can be configured to be stored in addressable storage media or to execute one or more processors. Therefore, a "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and parameters. The elements and functions provided by a "unit" can be combined into a smaller number of elements or "units," or divided into a larger number of elements or "units." Furthermore, elements and "units" can be implemented as one or more CPUs within a playback device or secure multimedia card. Additionally, a "unit" in the embodiments may include one or more processors.

[0039] In the following description, the methods and apparatus presented in the embodiments of this disclosure are not limited to each embodiment, and can be applied using all or some combinations of one or more embodiments presented in this disclosure. Furthermore, embodiments of this disclosure can be applied with modifications (as determined by one of skill in the art) that do not significantly depart from the scope of this disclosure.

[0040] In the following text, reference will be made to Figures 1 to 11 The method proposed in this disclosure and the device capable of performing the method are described in detail.

[0041] Figure 1 The structure of a non-terrestrial network (NTN) according to an embodiment of the present invention is shown.

[0042] Reference Figure 1In a fifth-generation mobile communication (5G) system, when a mobile communication terminal 110 is not within the coverage area of ​​a terrestrial base station or when the terrestrial base station has difficulty providing communication services, the terminal 110 can communicate with a satellite base station 120. A network providing communication services via a satellite not on the ground can be called a non-terrestrial network (NTN). In an NTN, the satellite 120 can be used independently as a base station, or it can be used to relay signals from a 5G network gateway 130 that is used as a base station on the ground, and the actual role of the satellite can vary depending on the structure of the NTN. The 5G network gateway 130 can connect to a core network 140 and can transmit data from the core network and external networks to the terminal, or transmit data from the terminal to the core network and external networks. The satellite 120 used in the NTN should be equipped with a 5G communication modem to enable wireless communication with the terminal, and in this case, it can be called a satellite base station. Because such satellites are thousands to tens of thousands of kilometers away from the ground, the radio waves transmitted between the terminal 110 and the satellite 120 can have a longer propagation delay than those of a terrestrial network (TN). If messages need to be exchanged between terminal 110 and satellite base station 120, a round-trip time (RTT) equal to the sum of the propagation delay from terminal 110 to satellite base station 120 and the propagation delay from satellite base station 120 to terminal 110 is required. In an NTN, a large RTT can lead to a degraded service quality. Therefore, to provide services with short latency requirements in an NTN, it is necessary to design a method that can send data corresponding to such services by minimizing propagation delay or round-trip time.

[0043] Figure 2 An example of uplink retransmission delay occurring in an NTN according to an embodiment of this disclosure is shown.

[0044] In this disclosure, an uplink refers to a wireless link transmitted from terminal 210 to a base station. In NTN, a wireless link from terminal 210 to satellite base station 220, or a wireless link from terminal 210 via satellite base station 220 to a 5G network gateway connected to satellite base station 220 and used as a base station, can be referred to as an uplink.

[0045] To transmit uplink data, satellite base station 220 first allocates resources (uplink resources (uplink grants)) that can be transmitted to terminal 210 via the uplink (230). According to an embodiment, base station 220 can send uplink resource allocation information to terminal 210 in the format of downlink control information (DCI) of the physical downlink control channel (PDCCH). Terminal 210, having decoded the received DCI, knows the location and details of the radio resources where the actual uplink transmission will occur. Terminal 210 receives the uplink resource allocation information 230 after a propagation delay of 235 seconds since the information was sent from base station 220. Afterward, terminal 210 can send uplink data to satellite base station 220 (240). Satellite base station 220 receives the uplink data after a propagation delay of 245 seconds since the information was sent from terminal 210. If base station 220 fails to receive uplink transmission, it can allocate uplink resources (250) for retransmission. Base station 220 can also send uplink resource allocation information for retransmission to terminal 210 via the DCI format of the PDCCH, and terminal 210, having decoded the received DCI content, can know the location and details of the radio resources where the actual uplink transmission will occur. Terminal 210 receives uplink resource allocation information 250 after a propagation delay of 255 from when satellite base station 220 sends the uplink resource allocation information to terminal 210. Afterward, terminal 210 can send uplink data (260) corresponding to the retransmission to satellite base station 220. Satellite base station 220 receives uplink data after a propagation delay of 265 from when terminal 210 sends the uplink data. Figure 2As shown, in NTN, due to the long propagation delays 235, 245, 255, and 265, the retransmission delay 270, which includes the propagation delay, also becomes longer. In this disclosure, the retransmission delay can also be referred to as the round-trip time (RTT). Thus, in NTN, due to the long propagation delay, the retransmission delay becomes longer, and with the long retransmission delay, it is difficult to provide data with short latency requirements, which may lead to performance degradation. For the terminal, it may not be necessary to perform retransmission by allocating uplink radio resources so that the base station can retransmit according to the latency requirements. For example, when the time required for uplink retransmission is too long to meet the latency requirements, retransmission may not be performed, or the number of retransmissions may be reduced relative to a specific uplink transmission. Since such uplink retransmission is performed for each HARQ process in the HARQ process, the base station can configure in the terminal whether to perform uplink retransmission for each HARQ process. Furthermore, the configuration message for whether to perform such uplink retransmission can be sent in Media Access Control Unit (MAC CE) format or Downlink Control Information (DCI) format. The MAC CE and DCI described above are merely examples, and this disclosure is not limited thereto.

[0046] Despite Figure 2 The uplink transmission between the satellite base station and the terminal is used as an example, but this is only for the convenience of description, and this disclosure is not limited thereto. Even when the satellite base station is replaced by a 5G network gateway, the propagation delay is changed to the sum of the propagation delay between the satellite base station and the terminal and the propagation delay between the satellite base station and the 5G network gateway, but the phenomenon of increased retransmission delay can be explained in the same way.

[0047] Figure 3 A method for applying logical channel priority (LCP) constraints according to embodiments of the present disclosure is illustrated.

[0048] In a mobile communication system to which this disclosure can be applied, radio bearers can be divided into control signaling radio bearers (Signaling Radio Bearers (SRBs)) for transmitting control information, such as Radio Resource Control (RRC) messages or Non-Access Stratum (NAS) messages, and data radio bearers for transmitting user data. Furthermore, radio bearers can have Serving Data Adaptation Protocol (SDAP), Packet Data Convergence Protocol (PDCP), and Radio Link Control (RLC) layer devices (entities). An SRB may not have an SDAP device. Each RLC device of a radio bearer can correspond to a MAC device, and the MAC device transmits data in one or more cells. A cell can have several Hybrid Automatic Repeat Request (HARQ) procedures, and the MAC device can send or receive packets for each HARQ procedure. See reference. Figure 3 , showing in Figure 3In the embodiments described, each of cell 1 and cell 2 has 8 HARQ processes, and each HARQ process has a HARQ process ID (HPI) ranging from 0 to 7. This is merely an assumption for ease of description, and the present disclosure is not limited thereto. That is, the number of HARQ processes in each cell can vary depending on the communication system or terminal. Furthermore, different configuration information can be configured for each radio bearer according to requirements such as the latency and reliability of information transmitted by the radio bearer.

[0049] As mentioned above, in Figure 2 In communication systems with long propagation delays (such as NTNs), retransmission delays become longer, so performing multiple retransmissions may increase the latency of information transmitted by the radio bearer. If the information transmitted by the radio bearer requires a short latency, multiple retransmissions exceed the latency requirement, and therefore, upon receiving the information, it may be equal to information that is no longer needed. On the other hand, when information transmitted by a predetermined radio bearer is valid even with long latency, multiple retransmissions can be performed to improve reliability. In such communication systems with long propagation delays, data transmission can be performed by adjusting the number of retransmissions according to the latency requirement. However, in the case of uplink transmissions, the terminal cannot know the number of uplink transmissions configured by the base station. Therefore, the terminal cannot adjust the number of retransmissions or determine whether to perform data transmission based on the number of retransmissions. If the base station determines the number of retransmissions for each HARQ process to be used, and the terminal can receive the configuration of available (allowed) HARQ processes for each logical channel from the base station, data can be transmitted using the available HARQ processes for each logical channel, and retransmission of the transmitted data can be performed as long as the latency requirement is met.

[0050] Therefore, in Figure 3 In one embodiment, a method for configuring available HARQ processes for each logical channel applied by a MAC device is described. A list of available (allowed) HARQ processes (e.g., allowedHARQProcess-List) can be included in the logical channel configuration in an RRC message sent by the base station to the terminal. In this case, to allow data transmission only via uplink radio resources (uplink grants) included in the list of available HARQ processes for the corresponding logical channel, the terminal can perform a logical channel prioritization operation. After performing the logical channel prioritization operation, the terminal can perform uplink transmission by including data for the logical channel in the uplink radio resources, which ensures the size of the resources through which data can be transmitted.

[0051] Figure 3The embodiments illustrate a method for configuring a list of available (allowed) HARQ processes in a MAC device. Each cell has a HARQ process ID ranging from 0 (the number of HARQ processes in the cell) to -1, and this ID value can be unique only within the corresponding cell. Therefore, when available HARQ processes are configured in a MAC device, the IDs of the available HARQ processes can be shared across the HARQ processes of all MAC devices connected to (or within a cell group). Thus, in the case where carrier aggregation of multiple cells is configured, available HARQ processes that are shared across all cells in the MAC device can be configured, thereby preventing an increase in configuration overhead. Regarding Figure 3 The embodiment of the logical channel illustrates that the available HARQ processes are HARQ processes with HPI=1 and HPI=2. Therefore, for the logical channel, uplink radio resources can be used to perform uplink transmissions using the uplink radio resources corresponding to the HARQ processes with HPI=1 and HPI=2 for all cells connected to (or within the cell group) the MAC device. According to another embodiment, when the list of available HARQ processes for the logical channel is not configured, all configured HARQ processes can be used for the logical channel.

[0052] Figure 3 The embodiment illustrates an example where the list of available HARQ processes is represented as a bitmap of the maximum size of the number of HARQ processes configured in the cell. That is, since each cell has 8 HARQ processes, the list of available HARQ processes can be represented as an 8-bit bitmap, and a value of 1 in the nth bit (0 <= n <= (number of HARQ processes in the cell) - 1) could mean that the HARQ process corresponding to HARQ process ID = n can be used. Conversely, a value of 0 in the nth bit (0 <= n <= (number of HARQ processes in the cell) - 1) could mean that the HARQ process corresponding to HARQ process ID = n cannot be used.

[0053] In another embodiment of this disclosure, instead of such a bitmap, a list of HARQ process IDs available in all cells connected to (or within a cell group) the MAC device can be included. For example, in Figure 3 In the case of an embodiment, 1 and 2 can be included in the list of available HARQ processes.

[0054] Figure 4 A method for applying LCP restrictions according to embodiments of the present disclosure is shown.

[0055] In a mobile communication system to which this disclosure can be applied, radio bearers can be divided into control signal radio bearers (signaling radio bearers (SRBs)) for transmitting control information such as RRC messages or NAS messages, and data radio bearers for transmitting user data. Furthermore, radio bearers can have SDAP, PDCP, and RLC layer devices. An SRB may not have an SDAP device. Each RLC device of a radio bearer can correspond to a MAC device, and the MAC device transmits data in one or more cells. A cell can have several HARQ processes, and the MAC device can send or receive packets for each HARQ process. See reference. Figure 4 , showing in Figure 4 In the embodiments described, each of cell 1 and cell 2 has 8 HARQ processes, and each HARQ process has a HARQ process ID (HPI) ranging from 0 to 7. This is merely an assumption for ease of description, and the present disclosure is not limited thereto. That is, the number of HARQ processes in each cell can vary depending on the communication system or terminal. Furthermore, different configuration information can be configured for each radio bearer according to requirements such as the latency and reliability of information transmitted by the radio bearer.

[0056] As mentioned above, in Figure 2 In communication systems with long propagation delays (such as NTNs), retransmission delays become longer, so performing multiple retransmissions may increase the latency of information transmitted by the radio bearer. If the information transmitted by the radio bearer requires a short latency, multiple retransmissions exceed the latency requirement, and therefore, upon receiving the information, it may be equal to information that is no longer needed. On the other hand, when information transmitted by a predetermined radio bearer is valid even with long latency, multiple retransmissions can be performed to improve reliability. In such communication systems with long propagation delays, data transmission can be performed by adjusting the number of retransmissions according to the latency requirement. However, in the case of uplink transmissions, the terminal cannot know the number of uplink transmissions configured by the base station. Therefore, the terminal cannot adjust the number of retransmissions or determine whether to perform data transmission based on the number of retransmissions. If the base station determines the number of retransmissions for each HARQ process to be used, and the terminal can receive from the base station the configuration of available (allowed) HARQ processes for each logical channel, then data can be transmitted using the available HARQ processes for each logical channel, and retransmission of the transmitted data can be performed as long as the latency requirement is met.

[0057] Therefore, in Figure 4In one embodiment, a method for configuring available HARQ processes for each cell for each logical channel is described. A list of available (allowed) HARQ processes for each cell can be included in the logical channel configuration in an RRC message sent by the base station to the terminal. In this case, to allow data to be transmitted only through uplink radio resources containing HARQ process IDs included in the list of available HARQ processes for the corresponding cell of the corresponding logical channel, the terminal can perform a logical channel prioritization operation. After performing the logical channel prioritization operation, the terminal can perform uplink transmission by including data for the logical channel in the uplink radio resources, which ensures the size of the resources through which data can be transmitted.

[0058] Figure 4 The embodiments illustrate a method for configuring a list of available (allowed) HARQ processes in a cell. Each cell has a HARQ process ID ranging from 0 (the number of HARQ processes in the cell) to -1, and this ID value can be unique only within the corresponding cell. Therefore, when configuring available HARQ processes in a particular cell, the IDs of the available HARQ processes can be applied only within that corresponding cell. Thus, in the case of carrier aggregation where multiple cells are configured, the advantage of operating cells independently can be obtained by configuring available HARQ processes for each different cell. Regarding Figure 4 The embodiment of the logical channel illustrates that the HARQ processes available in cell 1 are HARQ processes with HPI=1 and HPI=2, and the HARQ process available in cell 2 is a HARQ process with HPI=0. Therefore, for the logical channel, uplink transmissions can be performed using the uplink radio resources in cell 1 corresponding to the HARQ processes with HPI=1 and HPI=2, and uplink transmissions can be performed using the uplink radio resources in cell 2 corresponding to the HARQ process with HPI=0. According to another embodiment, when the list of available HARQ processes for the logical channel is not configured, all HARQ processes configured in the respective cells can be used for the logical channel.

[0059] Figure 4The embodiment illustrates an example where the list of available HARQ processes in each cell is represented as a bitmap of the maximum size of the number of HARQ processes configured in the cell. That is, since each cell has 8 HARQ processes, the list of available HARQ processes can be represented as an 8-bit bitmap, and a value of 1 in the nth bit (0 <= n <= (number of HARQ processes in the cell) - 1) could mean that the HARQ process corresponding to HARQ process ID = n can be used. Conversely, a value of 0 in the nth bit (0 <= n <= (number of HARQ processes in the cell) - 1) could mean that the HARQ process corresponding to HARQ process ID = n cannot be used. Furthermore, the cell ID can be used in the configuration to identify which cell a HARQ process is available for.

[0060] In another embodiment of this disclosure, instead of such a bitmap, a list of HARQ process IDs available in each cell can be included. For example, in Figure 4 In the case of this embodiment, HPI=1 and 2 can be included in the list of HARQ processes available in cell 1, and HPI=0 can be included in the list of HARQ processes available in cell 2. Even in this case, the cell ID can be used in the configuration to identify which cell a HARQ process is available for.

[0061] Figure 5 A method for applying LCP restrictions according to embodiments of the present disclosure is shown.

[0062] In a mobile communication system to which this disclosure can be applied, radio bearers can be divided into control signal radio bearers (signaling radio bearers (SRBs)) for transmitting control information such as RRC messages or NAS messages, and data radio bearers for transmitting user data. Furthermore, radio bearers can have SDAP, PDCP, and RLC layer devices. An SRB may not have an SDAP device. Each RLC device of a radio bearer can correspond to a MAC device, and the MAC device transmits data in one or more cells. A cell can have several HARQ processes, and the MAC device can send or receive packets for each HARQ process. See reference. Figure 5 , showing in Figure 5In the embodiments described, each of cell 1 and cell 2 has 8 HARQ processes, and each HARQ process has a HARQ process ID (HPI) from 0 to 7. This is merely an assumption for ease of description, and the present disclosure is not limited thereto. That is, the number of HARQ processes in each cell can vary depending on the communication system or terminal. Furthermore, different configuration information can be configured for each radio bearer according to requirements such as the latency and reliability of information transmitted by the radio bearer. As described above, in Figure 2 In communication systems with long propagation delays (such as NTNs), retransmission delays become longer, so performing multiple retransmissions may increase the latency of information transmitted by the radio bearer. If the information transmitted by the radio bearer requires a short latency, multiple retransmissions exceed the latency requirement, and therefore, upon receiving the information, it may be equal to information that is no longer needed. On the other hand, when information transmitted by a predetermined radio bearer is valid even with long latency, multiple retransmissions can be performed to improve reliability. In such communication systems with long propagation delays, data transmission can be performed by adjusting the number of retransmissions according to the latency requirement. However, in the case of uplink transmissions, the terminal cannot know the number of uplink transmissions configured by the base station. Therefore, the terminal cannot adjust the number of retransmissions or determine whether to perform data transmission based on the number of retransmissions. If the base station determines the number of retransmissions for each HARQ process to be used, and the terminal can receive the configuration of available (allowed) HARQ processes for each logical channel from the base station, data can be transmitted using the available HARQ processes for each logical channel, and retransmission of the transmitted data can be performed as long as the latency requirement is met.

[0063] to this end, Figure 5 The embodiments illustrate a method for configuring available HARQ processes for each logical channel applied by a MAC device. A list of available (allowed) HARQ processes can be included in the logical channel configuration in an RRC message sent by the base station to the terminal. In this case, to allow data transmission only through uplink radio resources containing HARQ process IDs included in the list of available HARQ processes for the corresponding logical channel, the terminal can perform a logical channel prioritization operation. After performing the logical channel prioritization operation, the terminal can perform uplink transmission by including data for the logical channel in the uplink radio resources, the logical channel ensuring the size of the resources through which data can be transmitted.

[0064] Figure 5The embodiments illustrate a method for configuring a list of available (allowed) HARQ processes in a MAC device. Each cell has a HARQ process ID ranging from 0 (the number of HARQ processes in the cell) to -1, and this ID value can be unique only within the corresponding cell. Therefore, when configuring available HARQ processes in a MAC device, the IDs of the available HARQ processes can be shared across the HARQ processes of all MAC devices connected to (or within a cell group). Thus, in the case where carrier aggregation of multiple cells is configured, available HARQ processes that are shared across all cells in the MAC device can be configured, thereby preventing increased configuration overhead. Figure 5 Implementations can show available HARQ processes based on the lowest offset of available HARQ process IDs (minimum available HPI) and the number of available HARQ processes. For example, for Figure 5 In the embodiment of the logical channel, the lowest offset (minimum available HPI) of the available HARQ process ID is configured to 0, and the number of available HARQ processes is configured to 6. This indicates that a HARQ process with an HPI greater than or equal to the lowest offset of the available HARQ process ID and less than or equal to (the lowest offset of the available HARQ process ID) + (the number of available HARQ processes) - 1 is available. That is, in Figure 5 In one embodiment, HARQ processes with HPI = 0, 1, 2, 3, 4, and 5 can be used for the corresponding logical channels. Therefore, for a given logical channel, uplink radio resources can be used to perform uplink transmissions using the uplink radio resources corresponding to the HARQ processes with HPI = 0, 1, 2, 3, 4, and 5 in all cells connected to (or within the cell group) the MAC device. According to another embodiment, when a list of available HARQ processes for a predetermined logical channel is not configured, all configured HARQ processes can be used for the corresponding logical channel. Furthermore, if the lowest offset of the available HARQ process ID is omitted, it can be assumed that the lowest offset has a value of 0.

[0065] Figure 6 A method for applying LCP restrictions according to embodiments of the present disclosure is shown.

[0066] In a mobile communication system to which this disclosure can be applied, radio bearers can be divided into control signal radio bearers (signaling radio bearers (SRBs)) for transmitting control information such as RRC messages or NAS messages, and data radio bearers for transmitting user data. Furthermore, radio bearers can have SDAP, PDCP, and RLC layer devices. An SRB may not have an SDAP device. Each RLC device of a radio bearer can correspond to a MAC device, and the MAC device transmits data in one or more cells. A cell can have several HARQ processes, and the MAC device can send or receive packets for each HARQ process. See reference. Figure 6 , showing in Figure 6 In the embodiments described, each of cell 1 and cell 2 has 8 HARQ processes, and each HARQ process has a HARQ process ID (HPI) ranging from 0 to 7. This is merely an assumption for ease of description, and the present disclosure is not limited thereto. That is, the number of HARQ processes in each cell can vary depending on the communication system or terminal. Furthermore, different configuration information can be configured for each radio bearer according to requirements such as the latency and reliability of information transmitted by the radio bearer.

[0067] As mentioned above, in Figure 2 In communication systems with long propagation delays (such as NTNs), retransmission delays become longer, so performing multiple retransmissions may increase the latency of information transmitted by the radio bearer. If the information transmitted by the radio bearer requires a short latency, multiple retransmissions exceed the latency requirement, and therefore, upon receiving the information, it may be equal to information that is no longer needed. On the other hand, when information transmitted by a predetermined radio bearer is valid even with long latency, multiple retransmissions can be performed to improve reliability. In such communication systems with long propagation delays, data transmission can be performed by adjusting the number of retransmissions according to the latency requirement. However, in the case of uplink transmissions, the terminal cannot know the number of uplink transmissions configured by the base station. Therefore, the terminal cannot adjust the number of retransmissions or determine whether to perform data transmission based on the number of retransmissions. If the base station determines the number of retransmissions for each HARQ process to be used, and the terminal can receive the configuration of available (allowed) HARQ processes for each logical channel from the base station, data can be transmitted using the available HARQ processes for each logical channel, and retransmission of the transmitted data can be performed as long as the latency requirement is met.

[0068] Therefore, in Figure 6In one embodiment, a method for configuring available HARQ processes for each cell for each logical channel is described. A list of available (allowed) HARQ processes for each cell can be included in the logical channel configuration in an RRC message sent by the base station to the terminal. In this case, to allow data to be transmitted only through uplink radio resources containing HARQ process IDs included in the list of available HARQ processes for the corresponding cell of the corresponding logical channel, the terminal can perform a logical channel prioritization operation. After performing the logical channel prioritization operation, the terminal can perform uplink transmission by including data for the logical channel in the uplink radio resources, the logical channel ensuring the size of the resources through which data can be transmitted.

[0069] Figure 6 The embodiments illustrate a method for configuring a list of available (allowed) HARQ processes in a cell. Each cell has a HARQ process ID ranging from 0 (the number of HARQ processes in the cell) to -1, and this ID value can be unique only within the corresponding cell. Therefore, when configuring available HARQ processes in a particular cell, the IDs of the available HARQ processes can be applied only within that corresponding cell. Thus, in the case of carrier aggregation where multiple cells are configured, the advantage of operating cells independently can be obtained by configuring available HARQ processes for each different cell. Figure 6 An implementation can show available HARQ processes based on the lowest offset (minimum available HPI) of the available HARQ process IDs for each cell and the number of available HARQ processes. For example, for Figure 6 In the logical channel of the embodiment, in cell 1, the minimum offset (minimum available HPI) of the available HARQ process ID is configured to 0, and the number of available HARQ processes is configured to 6. This indicates that HARQ processes with an HPI greater than or equal to the minimum offset of the available HARQ process ID and less than or equal to (minimum offset of the available HARQ process ID) + (number of available HARQ processes) - 1 are available. Furthermore, for the corresponding logical channel, in cell 2, the minimum offset (minimum available HPI) of the available HARQ process ID is configured to 6, and the number of available HARQ processes is configured to 2. This indicates that HARQ processes with an HPI greater than or equal to the minimum offset of the available HARQ process ID and less than or equal to (minimum offset of the available HARQ process ID) + (number of available HARQ processes) - 1 are available. That is, in Figure 6In one embodiment, in cell 1, HARQ processes with HPI = 0, 1, 2, 3, 4, and 5 can be used for the corresponding logical channels, and in cell 2, HARQ processes with HPI = 6 and 7 can be used for the corresponding logical channels. Therefore, in cell 1, for the corresponding logical channels, uplink radio resources corresponding to HARQ processes with HPI = 0, 1, 2, 3, 4, and 5 can be used to perform uplink transmissions, and in cell 2, for the corresponding logical channels, uplink radio resources corresponding to HARQ processes with HPI = 6 and 7 can be used to perform uplink transmissions. According to another embodiment, when the list of available HARQ processes for a logical channel is not configured, all HARQ processes configured in the corresponding cell can be used for the logical channel. Furthermore, if the lowest offset of the available HARQ process ID is omitted, it can be assumed that the lowest offset has a value of 0.

[0070] Figure 7 A method for applying LCP restrictions according to embodiments of the present disclosure is shown.

[0071] In a mobile communication system to which this disclosure can be applied, radio bearers can be divided into control signal radio bearers (signaling radio bearers (SRBs)) for transmitting control information such as RRC messages or NAS messages, and data radio bearers for transmitting user data. Furthermore, radio bearers can have SDAP, PDCP, and RLC layer devices. An SRB may not have an SDAP device. Each RLC device of a radio bearer can correspond to a MAC device, and the MAC device transmits data in one or more cells. A cell can have several HARQ processes, and the MAC device can send or receive packets for each HARQ process. See reference. Figure 7 , showing in Figure 7 In the embodiments described, each of cell 1 and cell 2 has 8 HARQ processes, and each HARQ process has a HARQ process ID (HPI) ranging from 0 to 7. This is merely an assumption for ease of description, and the present disclosure is not limited thereto. That is, the number of HARQ processes in each cell can vary depending on the communication system or terminal. Furthermore, different configuration information can be configured for each radio bearer according to requirements such as the latency and reliability of information transmitted by the radio bearer.

[0072] As mentioned above, in Figure 2In communication systems with long propagation delays (such as NTNs), retransmission delays become longer, so performing multiple retransmissions may increase the latency of information transmitted by the radio bearer. If the information transmitted by the radio bearer requires a short latency, multiple retransmissions exceed the latency requirement, and therefore, upon receiving the information, it may be equal to information that is no longer needed. On the other hand, when information transmitted by a predetermined radio bearer is valid even with long latency, multiple retransmissions can be performed to improve reliability. In such communication systems with long propagation delays, data transmission can be performed by adjusting the number of retransmissions according to the latency requirement. However, in the case of uplink transmissions, the terminal cannot know the number of uplink transmissions configured by the base station. Therefore, the terminal cannot adjust the number of retransmissions or determine whether to perform data transmission based on the number of retransmissions. If the base station determines the number of retransmissions for each HARQ process to be used, and the terminal can receive the configuration of available (allowed) HARQ processes for each logical channel from the base station, data can be transmitted using the available HARQ processes for each logical channel, and retransmission of the transmitted data can be performed as long as the latency requirement is met.

[0073] to this end, Figure 7 The embodiments illustrate a method for specifying available HARQ process IDs by HARQ process type. In this embodiment, the HARQ process type can include three types of HARQ process types, such as type 1T1, type 2T2, and type 3T3. This can be configured through cell-specific configurations common to the MAC layer (e.g., ServingCellConfig) or cell group configurations (e.g., CellGroupConfig). For example, as Figure 7 As shown, a HARQ process type can be configured for each HARQ process ID in a cell, and this type can be configured through cell-specific configurations common to the MAC layer (e.g., ServingCellConfig_) or cell group configurations (e.g., CellGroupConfig). Figure 7In the embodiments described, three HARQ processing types are assumed, but this is for ease of description and the present disclosure is not limited thereto. That is, the number of HARQ process types can vary depending on the embodiments. Available (permitted) HARQ process types can be included in the logical channel configuration of the RRC message sent by the base station to the terminal. In this case, in order to allow data to be transmitted only through uplink radio resources (uplink grants) corresponding to the HARQ process ID with respect to the available HARQ process type of the respective logical channel, the terminal can perform a logical channel prioritization operation. After performing the logical channel prioritization operation, the terminal can perform uplink transmission by including data for the logical channel in the uplink radio resources, the logical channel ensuring the size of the resources through which data can be transmitted.

[0074] Figure 7 Each cell shown in the embodiments has a HARQ process ID ranging from 0 (the number of HARQ processes in the cell) to -1, and this ID value can be unique only within the corresponding cell. Therefore, when available HARQ processes are configured in the MAC device, the IDs of the available HARQ processes can be shared across the HARQ processes of all MAC devices connected to (or within a cell group). Thus, in the case where carrier aggregation of multiple cells is configured, available HARQ processes that are shared across all cells in the MAC device can be configured, thereby preventing increased configuration overhead. Figure 7 An embodiment may illustrate available HARQ processes based on the available HARQ process types. For example, it may be relative to... Figure 7 The logical channel in this embodiment configures the available HARQ process types as type 1 and type 3 to indicate that a HARQ process corresponding to the corresponding type is an available HARQ process. That is, in Figure 7 In cell 1 of the embodiment, for the corresponding logical channel, uplink radio resources corresponding to HARQ processes of HPI=0, 1, 4, 5, 6, and 7 can be used to perform uplink transmission. Furthermore, in cell 2, for the corresponding logical channel, uplink radio resources corresponding to HARQ processes of HPI=0, 1, 2, 3, 6, and 7 can be used to perform uplink transmission. According to another embodiment, when the available HARQ process type for a logical channel is not configured, all HARQ processes configured in the corresponding cell can be used for the logical channel.

[0075] Figure 8 A method for applying LCP restrictions according to embodiments of the present disclosure is shown.

[0076] In a mobile communication system to which this disclosure can be applied, radio bearers can be divided into control signal radio bearers (signaling radio bearers (SRBs)) for transmitting control information such as RRC messages or NAS messages, and data radio bearers for transmitting user data. Furthermore, radio bearers can have SDAP, PDCP, and RLC layer devices. An SRB may not have an SDAP device. Each RLC device of a radio bearer can correspond to a MAC device, and the MAC device transmits data in one or more cells. A cell can have several HARQ processes, and the MAC device can send or receive packets for each HARQ process. See reference. Figure 8 , showing in Figure 8 In the embodiments described, each of cell 1 and cell 2 has 8 HARQ processes, and each HARQ process has a HARQ process ID (HPI) ranging from 0 to 7. This is merely an assumption for ease of description, and the present disclosure is not limited thereto. That is, the number of HARQ processes in each cell can vary depending on the communication system or terminal. Furthermore, different configuration information can be configured for each radio bearer according to requirements such as the latency and reliability of information transmitted by the radio bearer.

[0077] As mentioned above, in Figure 2 In communication systems with long propagation delays (such as NTNs), retransmission delays become longer, so performing multiple retransmissions may increase the latency of information transmitted by the radio bearer. If the information transmitted by the radio bearer requires a short latency, multiple retransmissions exceed the latency requirement, and therefore, upon receiving the information, it may be equal to information that is no longer needed. On the other hand, when information transmitted by a predetermined radio bearer is valid even with long latency, multiple retransmissions can be performed to improve reliability. In such communication systems with long propagation delays, data transmission can be performed by adjusting the number of retransmissions according to the latency requirement. However, in the case of uplink transmissions, the terminal cannot know the number of uplink transmissions configured by the base station. Therefore, the terminal cannot adjust the number of retransmissions or determine whether to perform data transmission based on the number of retransmissions. If the base station determines the number of retransmissions for each HARQ process to be used, and the terminal can receive the configuration of available (allowed) HARQ processes for each logical channel from the base station, data can be transmitted using the available HARQ processes for each logical channel, and retransmission of the transmitted data can be performed as long as the latency requirement is met.

[0078] to this end, Figure 8 The embodiments illustrate a method for specifying HARQ processes for individual groups. Figure 8In this embodiment, the HARQ process of a separate group can be referred to as a specific HARQ process. The terminal can be configured to specify which HARQ process is the specific HARQ process for each cell or each cell group. If cells in a cell group have the same HARQ process ID for a common specific HARQ process, the base station can notify the terminal of the specific HARQ process by configuring the specific HARQ process ID in the cell group configuration. Conversely, when each cell has a specific HARQ process ID, the base station can notify the terminal of the specific HARQ process by configuring the specific HARQ process ID in the cell configuration. Figure 8 In the embodiments described, it is assumed that each cell has a different HARQ process ID for a specific HARQ process. HARQ processes in cell 1 with HPI=0 and 1, and HARQ processes in cell 2 with HPI=0, are designated as specific HARQ processes. This is merely an assumption for ease of description, and the present disclosure is not limited thereto.

[0079] As described above, it is possible to configure whether a specific HARQ process can be used on a logical channel. The configuration value indicating whether a specific HARQ process can be used on a logical channel can be included in the logical channel configuration in the RRC message sent by the base station to the terminal. When a specific HARQ process is configured to be available on a logical channel, in order to allow data transmission via uplink radio resources (uplink grants) allocated to the specific HARQ process for the corresponding logical channel, the terminal can perform a logical channel prioritization operation. After performing the logical channel prioritization operation, the terminal can perform uplink transmission by including data for the logical channel in the uplink radio resources, the logical channel ensuring the size of the resources through which data can be transmitted. HARQ processes other than the specific HARQ process can be used on the corresponding logical channel. For example, a specific HARQ process is configured to be available on... Figure 8 In the embodiments described (e.g., SpecialHARQProcessAllowed = True), specific HARQ processes not configured as specific HARQ processes, as well as all HARQ processes in cell 1 and cell 2, can be used for the corresponding logical channels. Alternatively, when a specific HARQ process is not configured to be available for a logical channel (e.g., SpecialHARQProcessAllowed = False), in cell 1, HARQ processes corresponding to HPI = 2, 3, 4, 5, 6, and 7 can be used for the corresponding logical channels, while in cell 2, the HARQ process corresponding to HPI = 1 can be used for the corresponding logical channel. 2, 3, 4, 5, 6, and 7 can be used for the corresponding logical channels.

[0080] Figure 9An example of instructing uplink retransmissions based on terminal capabilities in an NTN according to an embodiment of the present disclosure is shown.

[0081] In NTN, the time required for data transmission is longer due to the long propagation delay 970. Depending on the number of retransmissions, the time can be several times the RTT. In this case, continuous data transmission may not be performed for the limited number of HARQ processes configured in terminal 910. On the other hand, due to practical limitations such as memory issues, terminal 910 is limited to having an unlimited number of HARQ processes. Therefore, terminal 910 can report the number of HARQ processes that can be used in each cell to base station 920 via a terminal capability message (922). The terminal capability message may include the number of HARQ processes that terminal 910 commonly supports in each cell, or the number of HARQ processes that the terminal supports for each cell. Since the terminal capability message also follows the general data transmission of NTN, the message can reach base station 920 after experiencing a propagation delay 925. Base station 920, having received the terminal capability message, allocates uplink resources to terminal 910 based on the information in the message (930) and allows uplink transmission 940 and retransmission 960 to be performed. According to the various embodiments disclosed above, a usable HARQ process can be configured for a logical channel by taking into account propagation delays of 925, 935, 945, 955, and 965, thereby enabling a more efficient communication system.

[0082] Figure 10 The structure of a terminal according to an embodiment of the present disclosure is shown.

[0083] refer to Figure 10 The terminal may include a transceiver 1010, a controller 1020, and a memory 1030. In this disclosure, the controller may be defined as a circuit, an application-specific integrated circuit (ASIC), or at least one processor. The transceiver 1010 may transmit signals to or receive signals from other network entities. For example, the transceiver 1010 may receive system information from a base station and may receive synchronization signals or reference signals. The controller 1020 may control the overall operation of the terminal according to the embodiments presented in this disclosure. For example, the controller 1020 may control the signal flow between blocks to perform operations according to the flowchart described above. The memory 1030 may store at least one of information transmitted or received via the transceiver 1010 and information generated via the controller 1020.

[0084] Figure 11 The structure of a base station according to an embodiment of the present invention is shown.

[0085] Reference Figure 11The base station may include a transceiver 1110, a controller 1120, and a memory 1130. In this disclosure, the controller 1120 may be defined as a circuit or an application-specific integrated circuit, or at least one processor. The transceiver 1110 may transmit signals to or receive signals from other network entities. For example, the transceiver 1110 may transmit system information to a terminal and may transmit synchronization signals or reference signals. The controller 1120 may control the overall operation of the base station according to the embodiments presented in this disclosure. For example, the controller 1120 may control the signal flow between blocks to perform operations according to the flowchart described above. The memory 1130 may store at least one of the information transmitted or received via the transceiver 1110 and the information generated via the controller 1120.

[0086] The embodiments of this disclosure described and illustrated in the specification and drawings are merely specific examples presented to readily explain the technical content of this disclosure and aid in understanding it, and are not intended to limit the scope of this disclosure. That is, those skilled in the art will understand that other variations based on the technical ideas of this disclosure can be implemented. Furthermore, the various embodiments described above can be combined as needed.

[0087] Although specific embodiments have been described in detail in this disclosure, it will be apparent that various modifications and changes can be made thereto without departing from the scope of this disclosure. Therefore, the scope of this disclosure should not be limited to the embodiments, but rather should be defined by the appended claims and their equivalents.

[0088] In addition, the above Figures 1 to 11 The methods described in this disclosure may include methods of combining one or more drawings according to various embodiments.

Claims

1. A method performed by a terminal in a communication system, the method comprising: The radio resource control (RRC) message is received from the base station. The RRC message includes a logical channel configuration for a first logical channel and a serving cell configuration for the serving cell. The serving cell configuration for the serving cell includes first information related to the HARQ process type corresponding to each of the plurality of Hybrid Automatic Repeat Request (HARQ) process identifiers ID of the serving cell. Identify the uplink authorization associated with the HARQ process ID among the plurality of HARQ process IDs; If the second information is included in the logical channel configuration for the first logical channel, then based on the first information, it is identified whether the HARQ process type indicated by the second information is allowed for the HARQ process ID, and if the HARQ process type indicated by the second information is allowed, the first logical channel is selected for the uplink authorization. If the second information is not included in the logical channel configuration for the first logical channel, then the first logical channel is selected for the uplink grant without HARQ process type restrictions; as well as Based on the uplink authorization, uplink data for the selected first logical channel is sent to the base station.

2. The method according to claim 1, further comprising: If the third information is included in the logical channel configuration for the second logical channel, then based on the first information, it is identified whether the HARQ process type indicated by the third information is allowed for the HARQ process ID, and if the HARQ process type indicated by the third information is allowed, the second logical channel is selected for the uplink grant. Based on the uplink grant, uplink data for the selected second logical channel is sent to the base station. The RRC message also includes a logical channel configuration for the second logical channel.

3. The method according to claim 2, further comprising: Based on the selection of the first logical channel, resources are allocated for the uplink authorization. The uplink data is transmitted within the allocated resources, and The uplink authorization is identified based on the downlink control information (DCI) received from the base station.

4. The method according to claim 1, wherein All HARQ processes of the serving cell are used for the first logical channel without HARQ type restrictions. The HARQ process type is associated with the scheduling of uplink retransmissions in the non-terrestrial network (NTN), and The HARQ process type indicated by the second information is either the first mode or the second mode.

5. A method performed by a base station in a communication system, the method comprising: A Radio Resource Control (RRC) message is sent to the terminal. The RRC message includes a logical channel configuration for a first logical channel and a serving cell configuration for the serving cell. The serving cell configuration for the serving cell includes first information related to the HARQ process type corresponding to each of the plurality of Hybrid Automatic Repeat Request (HARQ) process identifiers ID of the serving cell. as well as If the second information is included in the logical channel configuration for the first logical channel, and the HARQ process type indicated by the second information is permitted for use with the HARQ process ID among the plurality of HARQ process IDs based on the first information, then uplink data for the first logical channel is received from the terminal based on uplink grant, wherein the uplink grant is associated with the HARQ process ID among the plurality of HARQ process IDs, and If the second information is not included in the logical channel configuration for the first logical channel, then uplink data for the first logical channel is received from the terminal based on the uplink authorization without HARQ process type restrictions.

6. The method according to claim 5, further comprising: If the third information is included in the logical channel configuration for the second logical channel, and the HARQ process type indicated by the third information based on the first information is permitted, then uplink data for the second logical channel is received from the terminal based on the uplink grant. The RRC message also includes a logical channel configuration for the second logical channel.

7. The method according to claim 5, wherein The uplink data is received within resources allocated for the uplink grant, which are allocated based on the selection of the first logical channel. The uplink authorization is sent from the base station based on downlink control information (DCI).

8. The method according to claim 5, wherein, All HARQ processes of the serving cell are used for the first logical channel without HARQ type restrictions. The HARQ process type is associated with the scheduling of uplink retransmissions in the non-terrestrial network (NTN), and The HARQ process type indicated by the second information is either the first mode or the second mode.

9. A terminal of a communication system, the terminal comprising: transceiver; as well as A controller, which is connected to the transceiver and configured to: The radio resource control (RRC) message is received from the base station. The RRC message includes a logical channel configuration for a first logical channel and a serving cell configuration for the serving cell. The serving cell configuration for the serving cell includes first information related to the HARQ process type corresponding to each of the plurality of Hybrid Automatic Repeat Request (HARQ) process identifiers ID of the serving cell. Identify the uplink authorization associated with the HARQ process ID among the plurality of HARQ process IDs; If the second information is included in the logical channel configuration for the first logical channel, then based on the first information, it is identified whether the HARQ process type indicated by the second information is allowed for the HARQ process ID, and if the HARQ process type indicated by the second information is allowed, the first logical channel is selected for the uplink authorization. If the second information is not included in the logical channel configuration for the first logical channel, then the first logical channel is selected for the uplink grant without HARQ process type restrictions; as well as Based on the uplink authorization, uplink data for the selected first logical channel is sent to the base station.

10. The terminal according to claim 9, wherein The controller is also configured to: If the third information is included in the logical channel configuration for the second logical channel, then based on the first information, it is identified whether the HARQ process type indicated by the third information is allowed for the HARQ process ID, and if the HARQ process type indicated by the third information is allowed, the second logical channel is selected for the uplink grant. Based on the uplink grant, uplink data for the selected second logical channel is sent to the base station. The RRC message also includes a logical channel configuration for the second logical channel.

11. The terminal according to claim 10, wherein The controller is also configured to: Based on the selection of the first logical channel, resources are allocated for the uplink authorization. The uplink data is transmitted within the allocated resources, and The uplink authorization is identified based on the downlink control information (DCI) received from the base station.

12. The terminal according to claim 9, wherein, All HARQ processes of the serving cell are used for the first logical channel without HARQ type restrictions. The HARQ process type is associated with the scheduling of uplink retransmissions in the non-terrestrial network (NTN), and The HARQ process type indicated by the second information is either the first mode or the second mode.

13. A base station for a communication system, the base station comprising: transceiver; as well as A controller, which is connected to the transceiver and configured to: A Radio Resource Control (RRC) message is sent to the terminal. The RRC message includes a logical channel configuration for a first logical channel and a serving cell configuration for the serving cell. The serving cell configuration for the serving cell includes first information related to the HARQ process type corresponding to each of the plurality of Hybrid Automatic Repeat Request (HARQ) process identifiers ID of the serving cell. as well as If the second information is included in the logical channel configuration for the first logical channel, and the HARQ process type indicated by the second information is permitted for use with the HARQ process ID among the plurality of HARQ process IDs based on the first information, then uplink data for the first logical channel is received from the terminal based on uplink grant, wherein the uplink grant is associated with the HARQ process ID among the plurality of HARQ process IDs, and If the second information is not included in the logical channel configuration for the first logical channel, then uplink data for the first logical channel is received from the terminal based on the uplink authorization without HARQ process type restrictions.

14. The base station of claim 13, wherein, The controller is also configured to: If the third information is included in the logical channel configuration for the second logical channel, and the HARQ process type indicated by the third information based on the first information is permitted, then uplink data for the second logical channel is received from the terminal based on the uplink grant. The RRC message also includes logical channel configuration for the second logical channel. The uplink data is received within resources allocated for the uplink grant, and these resources are allocated based on the selection of the first logical channel. The uplink authorization is sent from the base station based on downlink control information (DCI).

15. The base station according to claim 14, wherein All HARQ processes of the serving cell are used for the first logical channel without HARQ type restrictions. The HARQ process type is associated with the scheduling of uplink retransmissions in the non-terrestrial network (NTN), and The HARQ process type indicated by the second information is either the first mode or the second mode.

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