Method and apparatus for performing autonomous retransmission considering configured licenses for reactivation

Abstract

The present disclosure relates to a communication method and system for converging a 5th generation (5G) communication system that supports higher data rates than a 4th generation (4G) system with technologies for the Internet of Things (IoT). The present disclosure may be applied to intelligent services based on 5G communication technology and IoT-related technologies, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security, and safety services. A method performed by a terminal in a communication system is provided. The method includes: receiving, from a base station, configuration information on a configured grant for uplink transmission, the configured grant being configured with autonomous transmission; identifying that a first Medium Access Control (MAC) protocol data unit (PDU) has been obtained for the configured grant when a previously configured grant for a Hybrid Automatic Repeat reQuest (HARQ) process is not prioritized, transmission of the first MAC PDU obtained for the HARQ process has not been performed, and the size of the first MAC PDU matches the size of the configured grant; and transmitting the obtained first MAC PDU when the configured grant is a prioritized uplink grant.

Description

Technical Field

[0001] The present disclosure relates to operations of a terminal and a base station in a mobile communication system. More specifically, the present disclosure relates to a method and an apparatus for performing autonomous retransmission by considering a configured grant of (re)activation in a mobile communication system. Background Art

[0002] In order to meet the demand for wireless data services that has grown since the deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also referred to as "ultra 4G networks" or "post-LTE systems". The 5G communication system is considered to be implemented in a higher frequency (mmWave) band, for example, the 60 GHz band, in order to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and large-scale antenna technologies are discussed in the 5G communication system. In addition, in the 5G communication system, development for system network improvement is carried out based on advanced small cells, cloud radio access network (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, coordinated multi-point (CoMP), receiver interference cancellation, and the like. In the 5G system, hybrid FSK and QAM modulation (FQAM) and sliding window superimposed coding (SWSC) as advanced coding modulation (ACM) and filter bank multicarrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as advanced access technologies have been developed.

[0003] The Internet (which is a human-centered connected network where humans generate and consume information) is now evolving into the Internet of Things (IoT), in which distributed entities such as things exchange and process information without human intervention. The Internet of Everything (IoE) has emerged, which is a combination of IoT technology and big data processing technology made possible by connecting to cloud servers. As technical elements such as "sensing technology", "wired / wireless communication and network infrastructure", "service interface technology", and "security technology" have been required for IoT implementation, recently, sensor networks, machine-to-machine (M2M) communication, machine type communication (MTC), and the like have been studied. Such an IoT environment can provide intelligent Internet technology services that create new value for human life by collecting and analyzing data generated among connected things. Through the fusion and combination of existing information technology (IT) and various industrial applications, IoT can be applied to various fields, including smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart home appliances, and advanced medical services.

[0004] Accordingly, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as sensor networks, machine type communication (MTC), and machine-to-machine (M2M) communication can be implemented through beamforming, MIMO, and array antennas. The application of the cloud radio access network (RAN) of the big data processing technology described above can also be considered as an example of the convergence between 5G technology and IoT technology.

[0005] The above information is presented only as background information to assist in the understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above can be applicable as prior art with respect to the present disclosure. SUMMARY OF THE INVENTION

[0006] TECHNICAL PROBLEM

[0007] Aspects of the present disclosure provide a method for a terminal in a mobile communication system to perform autonomous retransmission by considering reactivation or reconfiguration of a configured grant even when characteristics of the configured grant resources change.

[0008] SOLUTION TO THE PROBLEM

[0009] Aspects of the present disclosure will at least solve the above-mentioned problems and / or disadvantages and at least provide the advantages described below. Accordingly, aspects of the present disclosure provide a method for a terminal in a mobile communication system to perform autonomous retransmission by considering reactivation or reconfiguration of a configured grant even when characteristics of the configured grant resources change.

[0010] Additional aspects will be partially described in the following description, and will be partially apparent from the description, or may be learned by practice of the presented embodiments.

[0011] According to an aspect of the present disclosure, there is provided a method performed by a terminal in a communication system. The method includes: receiving, from a base station, configuration information about a configured grant for uplink transmission, the configured grant being configured with autonomous transmission; identifying that a first medium access control (MAC) protocol data unit (PDU) has been obtained for the configured grant when a previously configured grant for a hybrid automatic repeat request (HARQ) process is not prioritized, transmission of the first MAC PDU obtained for the HARQ process has not been performed, and a size of the first MAC PDU matches a size of the configured grant; and transmitting the obtained first MAC PDU when the configured grant is a prioritized uplink grant.

[0012] According to another aspect of the present disclosure, a terminal in a communication system is provided. The terminal includes: a transceiver, and a controller, the controller being connected to the transceiver and configured to: receive configuration information about a configured grant for uplink transmission from a base station, the configured grant being configured with autonomous transmission; identify that a first MAC PDU has been obtained for the configured grant when a previously configured grant for a HARQ process is not prioritized, transmission of the first MAC PDU obtained for the HARQ process has not been performed, and the size of the first MAC PDU matches the size of the configured grant; and transmit the obtained first MAC PDU when the configured grant is a prioritized uplink grant.

[0013] Advantages of the present invention

[0014] According to the present disclosure, by proposing a method in which a terminal performs autonomous retransmission by considering reactivation or reconfiguration of a configured grant, even if the characteristics of the configured grant resources change due to their reactivation or reconfiguration, the terminal can perform autonomous retransmission.

[0015] According to the following detailed description for disclosing various embodiments of the present disclosure in conjunction with the accompanying drawings, other aspects, advantages, and significant features of the present disclosure will become apparent to those skilled in the art. Description of the drawings

[0016] According to the following description made in conjunction with the accompanying drawings, the above and other aspects, features, and advantages of certain embodiments of the present disclosure will become more apparent. In the drawings:

[0017] Figure 1 An operation of configuring a configured grant (CG) and a HARQ process according to an embodiment of the present disclosure is shown;

[0018] Figure 2 An operation of performing autonomous retransmission in a configured grant according to an embodiment of the present disclosure is shown;

[0019] Figure 3 Problems in the autonomous retransmission operation when the resource configuration of the configured grant changes according to an embodiment of the present disclosure are shown;

[0020] Figure 4 An example of the operation state of a configured grant timer when the resource configuration of the configured grant changes according to an embodiment of the present disclosure is shown;

[0021] Figure 5 A method of considering reactivation or reconfiguration of resources when performing autonomous retransmission according to an embodiment of the present disclosure is shown;

[0022] Figure 6Illustrate the operation of a terminal according to an embodiment of the present disclosure to perform an autonomous retransmission at a time point when a configured grant of type 2 is activated or reactivated;

[0023] Figure 7 Illustrate the operation of a terminal according to an embodiment of the present disclosure to perform an autonomous retransmission at a time point when a configured grant is configured or reconfigured;

[0024] Figure 8 Illustrate the operation of a terminal according to an embodiment of the present disclosure to perform an autonomous retransmission at a time point when a configured grant of type 2 is activated or reactivated;

[0025] Figure 9 Illustrate the operation of a terminal according to an embodiment of the present disclosure to perform an autonomous retransmission at a time point when a configured grant is configured or reconfigured;

[0026] Figure 10 Illustrate the operation of a terminal according to an embodiment of the present disclosure to consider the (re)activation or (re)configuration of resources when performing an autonomous retransmission;

[0027] Figure 11 Illustrate the operation of a terminal according to an embodiment of the present disclosure to consider the (re)activation or (re)configuration of resources when performing an autonomous retransmission;

[0028] Figure 12 Illustrate the operation of a terminal according to an embodiment of the present disclosure to consider the (re)activation or (re)configuration of resources when performing an autonomous retransmission;

[0029] Figure 13 Illustrate the operation of a terminal according to an embodiment of the present disclosure to consider the (re)activation or (re)configuration of resources when performing an autonomous retransmission;

[0030] Figure 14 Illustrate the operation of a terminal according to an embodiment of the present disclosure to consider the (re)activation or (re)configuration of resources when performing an autonomous retransmission;

[0031] Figure 15 Illustrate the structure of a terminal according to an embodiment of the present disclosure;

[0032] Figure 16 Illustrate the structure of a base station according to an embodiment of the present disclosure.

[0033] The same reference numerals are used throughout the drawings to denote the same elements. Detailed Description

[0034] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to facilitate understanding, but these are to be considered merely exemplary. Thus, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. Additionally, descriptions of well-known functions and configurations may be omitted for clarity and conciseness.

[0035] The terms and phrases used in the following description and claims are not limited to bibliographical meanings, but are used by the inventors only to achieve a clear and consistent understanding of the present disclosure. Thus, it should be apparent to those skilled in the art that the following description of the various embodiments of the present disclosure is provided for illustrative purposes only and not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents.

[0036] It should be understood that, unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" also include plural referents. Thus, for example, a reference to "a component surface" also includes a reference to one or more such surfaces.

[0037] Figure 1 An operation of configuring a configured grant (CG) and a hybrid automatic repeat request (HARQ) process according to an embodiment of the present disclosure is shown.

[0038] Figure 1 An example of configuring a configured grant is shown.

[0039] Reference Figure 1, the configured grants 110, 120, 130, 140, and 150 are configured to have a predetermined period 100 on the timeline 160. The base station can configure each of the configured grants for a terminal, and here, the period for the configured grant and the location, size, modulation and coding rate, etc. of its radio resources can be configured. According to an embodiment, the configured grant can be activated immediately after its configuration or can be activated by a separate activation command. In a wireless communication system, there may be a configured grant that is activated immediately after its configuration without a separate procedure, and such a configured grant can be referred to as a type 1 configured grant. On the other hand, there may be a configured grant that is not activated at the time point of its configuration execution but is activated by a separate signal such as downlink control information (DCI), and such a configured grant can be referred to as a type 2 configured grant. The activation message of the type 2 configured grant may include at least one of detailed resource localization and information on the modulation and coding scheme (MCS). It can be assumed that these configured grants have a fixed traffic pattern or will be used for high-priority data. In some embodiments, the configured grant can be specifically allocated to data with short latency requirements. To this end, the base station can configure whether a specific configured grant in the terminal is available for each specific logical channel through RRC configuration messages (or higher-layer signaling) configuration. According to an embodiment, multiple configured grants can be configured in one terminal, and here, the period for each configured grant and the location, size, and modulation and coding rate of its radio resources can be configured differently.

[0040] A configured grant can use one or more HARQ processes, and when configuring the configured grant resources, the available HARQ processes can be configured by the base station. The HARQ process ID (HPI) of the HARQ process available for the configured grant includes the HARQ process ID offset, and the HARQ process ID = (HARQ process ID offset)+(the number of available HARQ processes)-1 can be used for each HARQ process. In Figure 1 the embodiment, it is assumed that the HARQ process ID offset is configured to 0 and the number of available HARQ processes is configured to 2, but this can be changed. This can indicate that the configured grant can alternately use two HARQ processes from HARQ process ID 0 to HARQ process ID 1.

[0041] Figure 2 Shows the operation of performing autonomous retransmission in the configured grant according to an embodiment of the present disclosure.

[0042] When the configured grant resources 210, 220, 230, 240, and 250 overlap with another resource (another uplink resource (uplink grant) or a scheduling request transmission) on the time axis 260 or the time and frequency axis, and when the priority of the overlapping resource is higher than the priority of the configured grant resource, the configured grant resource has a lower priority (priority is reduced) and cannot be used for transmission. Here, the media access control protocol data unit (MAC PDU) that can be transmitted in the configured grant resource may have been obtained from a multiplexing / assembly device (or entity) and generated in the HARQ buffer of the terminal. However, the base station that allocates radio resources may not accurately know whether the MAC PDU exists in the HARQ buffer of the terminal for the configured grant resource with reduced priority, and thus cannot allocate retransmission resources for the configured grant. To solve this problem, if the MAC PDU for the configured grant resource has been generated and has not been transmitted yet because the priority of the previously configured grant resource has been reduced, the MAC PDU can be transmitted in the next configured grant resource that has the same HARQ process ID as the HARQ process ID of the configured grant resource with reduced priority. This can be referred to as autonomous retransmission or autonomous transmission. In the present disclosure, this is referred to as autonomous retransmission.

[0043] Reference Figure 2 , when the first configured grant resource 220 of HARQ process ID 1 overlaps with another uplink resource (uplink grant) 225 on the time axis 260, the uplink grant has a higher priority and is thus used for transmission, and the configured grant resource becomes a uplink grant with reduced priority and thus cannot be used for transmission. However, if the MAC PDU for the configured grant resource has been obtained, the MAC PDU can be transmitted in the next configured grant resource 240 that has the same HARQ process ID 1 as the configured grant resource 220. This autonomous retransmission operation can be applied only when the MAC PDU stored in the HARQ buffer has not been retransmitted through retransmission resources.

[0044] Figure 3Illustrates problems in the autonomous retransmission operation when the configured grant resource configuration changes. When the configured grant resource has been configured, the base station can partially change the configuration of the configured grant according to changes in the channel state of the terminal, changes in the amount of data processed by the base station, or various other reasons. This configuration change can be configured through an RRC reconfiguration message (or higher layer signaling), and the type 2 configured grant can be reconfigured through a DCI (or layer 1 (L1) signaling) of a physical downlink control channel (PDCCH) through an activation instruction. Here, the reconfigurable information can include the size of the MAC PDU (transport block) of the configured grant, information about the modulation and coding scheme (MCS), and so on.

[0045] Reference Figure 3 , a configured grant configuration is configured and wireless resources 310, 320, 330, and 340 are configured, and then the characteristics of the configured grant resource have changed due to the reactivation of the type 2 configured grant or the reconfiguration of the type 1 or type 2 configured grant (indicated by reference numeral 345). In this embodiment, it is assumed that the HARQ process ID offset is configured to 0 and the number of available HARQ processes is configured to 2, but this can be changed. This can mean that the configured grant can alternately use two HARQ processes from HARQ process ID 0 to HARQ process ID 1. In operation 345, if the characteristics of the configured grant resource change due to the reactivation of the type 2 configured grant or the reconfiguration of the configured grant, the MAC PDU that has been generated but not sent in the lower-priority configured grant resource 330 and does not overlap with the high-priority wireless resource 335 on the time axis 360 cannot be sent as it is in the next wireless resource 350 having the same HARQ process ID as the lower-priority configured grant resource 330 according to the autonomous retransmission method. For example, because the size of the configured grant resource has changed, the transmission of the MAC PDU cannot be performed as it is. In the case where the size of the resource changes due to reactivation or reconfiguration or in the case where the configuration information of the configured grant changes, it is difficult to say that performing autonomous retransmission considering the same configured grant configuration is a planned transmission operation in the communication system. Therefore, the present disclosure proposes a method for solving the above problems.

[0046] Figure 4An example of the running state of the configured grant timer when the configured grant resource configuration changes according to an embodiment of the present disclosure is shown. When the configured grant resources are configured, the base station may partially change the configuration of the configured grant due to a change in the channel state of the terminal, a change in the amount of data processed by the base station, or various other reasons. This configuration change may be configured by an RRC reconfiguration message (or higher layer signaling), and the type 2 configured grant may be reconfigured with an activation instruction by DCI (or L1 signaling) of the physical downlink control channel (PDCCH). Here, the reconfigurable information may include the size of the MAC PDU (transport block) of the configured grant, information on modulation and coding scheme (MCS) information, and so on. The HARQ process used by the configured grant may be used by the dynamic grant ( Figure 4 DG in) rather than the configured grant. The dynamic grant includes: an uplink grant allocated using a cell broadcast network temporary identifier (C-RNTI), or an uplink grant allocated as a retransmission resource of the configured grant and using a configured scheduling broadcast network temporary identifier (CS-RNTI). If the dynamic grant resources are allocated with respect to the HARQ process configured in the configured grant, the configured grant timer may run, and when the configured grant timer is running, the configured grant resources may not be used.

[0047] Refer to Figure 4 , one configured grant configuration is configured and wireless resources 410, 420, 430, and 440 are configured on the time axis 460, and then the characteristics of the configured grant resources have changed due to the reactivation of the type 2 configured grant or the reconfiguration of the type 1 or type 2 configured grant (indicated by reference numeral 445). In this embodiment, it is assumed that the HARQ process ID offset is configured to 0 and the number of available HARQ processes is configured to 2, but this may change. This may indicate that the configured grant may alternately use two HARQ processes from HARQ process ID 0 to HARQ process ID 1. In operation 445, the characteristics of the configured grant resources change due to the reactivation of the type 2 configured grant or the reconfiguration of the configured grant, and thus the changed configured grant configuration is used in CGs 450 and 455. In Figure 4 's embodiment, the dynamic grant 435 is allocated with respect to HARQ process ID 1, and thus the configured grant timer operates (indicated by reference numeral 437). Therefore, the configured grant resources 440 and 455 with HARQ process ID 1 cannot be used for actual transmission. Although the configured grant configuration has changed in operation 445, the configured grant resources with HARQ process ID 1 cannot be used for transmission due to the running of the configured grant timer.

[0048] Even if the characteristics of the configured grant resources change due to reactivation of the configured grant of type 2 or configuration of the configured grant (which may include the case of reactivation or reconfiguration of the same configuration), since the HARQ process in which the configured grant timer runs is currently used for transmission, initialization that clears (or flushes) the HARQ buffer should be avoided.

[0049] Figure 5 A method of considering reactivation or reconfiguration of resources when performing an autonomous retransmission according to an embodiment of the present disclosure is shown. When the configured grant resources have been configured, the base station may partially change the configuration of the configured grant due to a change in the channel state of the terminal, a change in the amount of data processed by the base station, or various other reasons. This configuration change may be configured by an RRC reconfiguration message, and the configured grant of type 2 may be reconfigured by DCI of a physical downlink control channel (PDCCH) using an activation instruction. Here, the reconfigurable information may include the size of the MAC PDU (transport block) of the configured grant, information about the modulation and coding scheme (MCS), and the like.

[0050] Reference Figure 5 , a configured grant configuration is configured and wireless resources 510, 520, 530, and 540 are configured on a time axis 560, and then the characteristics of the configured grant resources have changed due to reactivation of the configured grant of type 2 or reconfiguration of the configured grant of type 1 or type 2 (indicated by reference numeral 545). In this embodiment, it is assumed that the HARQ process ID offset is configured to 0 and the number of available HARQ processes is configured to 2, but this may change. This may indicate that the configured grant may alternately use two HARQ processes from HARQ process ID 0 to HARQ process ID 1. In operation 545, if the characteristics of the configured grant resources change due to reactivation of the configured grant of type 2 or reconfiguration of the configured grant, the MAC PDU that has been generated but not transmitted in the configured grant resource 530 with a reduced priority that does not overlap with the high-priority wireless resource 535 on the time axis may not be transmitted as it is in the next wireless resource 550 having the same HARQ process ID as the configured grant resource 530 with a reduced priority. For example, since the size of the configured grant resources has changed, the transmission of the MAC PDU may not be performed as it is.

[0051] To solve this problem, according to Figure 5In an embodiment, during the operation of the HARQ entity for the configured grant resource 550 used for autonomous retransmission, the size of the MAC PDU that has been obtained and stored in the buffer of the HARQ process is compared with the size of the configured grant resource (indicated by reference numeral 547). The size of the MAC PDU that has been obtained and stored in the buffer of the HARQ process may be the same as the size of a previously configured grant resource 530 with reduced priority. Thus, it can be determined whether to transmit the stored MAC PDU by determining whether the size of the stored MAC PDU is the same as, greater than, or less than the size of the allocated configured grant 550.

[0052] For example, if the size of the MAC PDU stored in the HARQ buffer matches the size of the allocated configured grant, autonomous retransmission of the MAC PDU can be performed by taking into account that the MAC PDU has been obtained. In an embodiment, if the size of the MAC PDU stored in the HARQ buffer is equal to or less than the size of the allocated configured grant, autonomous retransmission of the MAC PDU can be performed by taking into account that the MAC PDU has been obtained. In an embodiment, if the size of the MAC PDU stored in the HARQ buffer is less than the size of the allocated configured grant, autonomous retransmission of the MAC PDU can be performed after adding additional MAC service data units (SDUs) to the resources remaining after the inclusion of the MAC PDU. In an embodiment, if the size of the MAC PDU stored in the HARQ buffer is greater than the size of the allocated configured grant, the terminal can instruct the multiplexing / assembly device (or entity) to include the SDUs included in the MAC PDU and obtain the MAC PDU to perform the transmission of the MAC PDU.

[0053] Figure 6 Shows the operation of the terminal performing autonomous retransmission at the time point when the configured grant of type 2 according to an embodiment of the present disclosure is activated or reactivated. When the configured grant resource is configured, the base station may partially change the configuration of the configured grant due to a change in the channel state of the terminal, a change in the amount of data processed by the base station, or various other reasons. In the case of the configured grant of type 2, this configuration change can be reconfigured by DCI (or layer 1 signaling) of the physical downlink control channel (PDCCH) using an activation indication. Here, the reconfigurable information may include the size of the MAC PDU (transport block) of the configured grant, the location of the transmission resources, information about the modulation and coding scheme (MCS), and so on. If the configured grant of type 2 is activated or reactivated in operation 610, the characteristics of the configured grant resource have been changed, and thus, even if Figure 3As described, autonomous retransmission is already configured, and it is also not possible to use autonomous retransmission to send a MAC PDU that has been acquired but not yet transmitted because of a reduction in the priority of the previously configured grant resources. For this purpose, when the configured grant of type 2 is activated or reactivated, in operation 620, the HARQ buffer of the HARQ process for which the configured grant timer is not running among the HARQ processes for the corresponding configured grant can be emptied (buffer flush). For example, if the HARQ process IDs of the HARQ processes used by a predetermined configured grant are 0, 1, and 2 and the configured grant timer for HARQ process ID 1 is running, the HARQ buffers of the HARQ processes with HARQ process IDs 0 and 2 for which the configured grant timer is not running can be emptied (or flushed). In some embodiments, in operation 620, an operation can be performed to empty the HARQ buffer of the HARQ process for which the configured grant timer is not running among the HARQ processes for the corresponding configured grant, and the HARQ process starts in resources allocated using a C-RNTI or CS-RNTI. As Figure 4 As described, since transmission in dynamic grants is currently being performed in the HARQ process in which the configured grant timer is running, if the HARQ buffer is emptied (or flushed), data loss may occur in the HARQ process in which the transmission is performed. Therefore, the HARQ buffer of the HARQ process in which the configured grant timer is running cannot be emptied (or flushed).

[0054] In some embodiments, there may be no difference in the configuration method between the activation and reactivation of the configured grant of type 2, and reactivation may refer to a re-indication of the activation of the configured grant of type 2 that has been previously configured and activated.

[0055] Refer to Figure 6 , in the case where the configured grant of type 2 is activated or reactivated in operation 610, operation 620 can be applied to it. However, in an embodiment, when the configured grant of type 2 is deactivated and cleared, an operation to empty the HARQ buffer according to the configured grant timer described in operation 620 can be performed.

[0056] Figure 7The operation of the terminal according to an embodiment of the present disclosure performing autonomous retransmission at the time point when the configured grant is configured or reconfigured is shown. When the configured grant resources have been configured, the base station may partially change the configuration of the configured grant due to a change in the channel state of the terminal, a change in the amount of data processed by the base station, or various other reasons. The configuration change may be configured or reconfigured through an RRC reconfiguration message (or higher layer signaling). In the case of a type 1 configured grant, the information configurable or reconfigurable through the RRC reconfiguration message may include the size of the MAC PDU (transport block) of the configured grant, the location of the transmission resources, information about the modulation and coding scheme (MCS), and so on. In the case of a type 1 configured grant and a type 2 configured grant, the period of the configured grant may be reconfigured through the RRC reconfiguration message. When the type 1 configured grant is configured or reconfigured in operation 710, because the characteristics of the configured grant resources have changed, even if autonomous retransmission has been configured as described in Figure 3 , the MAC PDU that has been obtained but not yet transmitted because the priority of the previous configured grant resources has decreased cannot be sent through autonomous retransmission. For this purpose, when the configured grant is configured or reconfigured, in operation 720, the HARQ buffer of the HARQ processes in which the configured grant timer is not running among the HARQ processes for the corresponding configured grant may be emptied (buffer flushing). For example, if the HARQ process IDs of the HARQ processes used by a predetermined configured grant are 0, 1, and 2 and the configured grant timer of HARQ process ID 1 is running, the HARQ buffers of the HARQ processes with HARQ process IDs 0 and 2 in which the configured grant timer is not running may be emptied (or flushed). In some embodiments, in operation 720, an operation of emptying the HARQ buffer of the HARQ processes in which the configured grant timer is not running among the HARQ processes for the corresponding configured grant may be performed, and the HARQ process starts in the resources allocated using the C-RNTI or CS-RNTI. As described in Figure 4 , since transmission in the dynamic grant is currently performed in the HARQ process in which the configured grant timer is running, if the HARQ buffer is emptied (or flushed), data loss in the HARQ process in which the transmission is performed may occur. Therefore, the HARQ buffer of the HARQ process in which the configured grant timer is running cannot be emptied (or flushed).

[0057] In some embodiments, there may be no difference in the configuration method between the configured grant configuration and its reactivation, and the reactivation may refer to a re-indication of the activation of the configured grant that has been previously configured and activated.

[0058] Reference Figure 7 , regardless of whether the configured grant in operation 710 is a type-1 configured grant or a type-2 configured grant, the process proceeds to operation 720. However, in an embodiment, the operation of emptying the HARQ buffer according to the configured grant timer described in operation 720 may be performed only when a type-1 configured grant is configured or reconfigured. In Figure 7 an embodiment, operation 720 may be applied in the case where a configured grant is configured or reconfigured in operation 710. However, in an embodiment, when the configured grant is released or cleared, the operation of emptying the HARQ buffer according to the configured grant timer described in operation 720 may be performed.

[0059] Figure 8 FIG. shows an operation in which a terminal according to an embodiment of the present disclosure performs an autonomous retransmission at a time point when a type-2 configured grant is activated or reactivated. When a configured grant resource has been configured, the base station may partially change the configuration of the configured grant due to a change in the channel state of the terminal, a change in the amount of data processed by the base station, or various other reasons. In the case of a type-2 configured grant, this configuration change may be reconfigured by DCI (or L1 signaling) of a physical downlink control channel (PDCCH) using an activation instruction. Here, the reconfigurable information may include the size of the MAC PDU (transport block) of the configured grant, the location of the transmission resource, information about the modulation and coding scheme (MCS), and so on. When a type-2 configured grant is activated or reactivated in operation 810, since the characteristics of the configured grant resource have changed, even if as Figure 3As described, if the autonomous retransmission is configured, the MAC PDU that has been obtained but not yet transmitted due to the reduced priority of the previously configured grant resources cannot be transmitted through autonomous retransmission. Therefore, in operation 820, it can be identified whether the autonomous retransmission is configured for the corresponding configured grant. If the autonomous retransmission is configured for the configured grant when the type 2 configured grant is activated or reactivated, in operation 830, the HARQ buffer of the HARQ process for the corresponding configured grant in which the configured grant timer is not running can be cleared (buffer flush). For example, if the HARQ process IDs of the HARQ processes used by a predetermined configured grant are 0, 1, and 2 and the configured grant timer of HARQ process ID 1 is running, the HARQ buffers of the HARQ processes for HARQ process ID 0 and HARQ process ID 2 in which the configured grant timer is not running can be cleared (or flushed). In some embodiments, in operation 830, an operation of clearing the HARQ buffer of the HARQ process for the corresponding configured grant in which the configured grant timer is not running can be performed, and the HARQ process starts from the resources allocated using C-RNTI or CS-RNTI. As Figure 4 As described, since the transmission in the dynamic grant is currently performed in the HARQ process in which the configured grant timer is running, if the HARQ buffer is cleared (or flushed), data loss in the HARQ process in which the transmission is performed may occur. Therefore, the HARQ buffer of the HARQ process in which the configured grant timer is running cannot be cleared (or flushed).

[0060] In some embodiments, there may be no difference in the configuration method between the activation and reactivation of the type 2 configured grant, and the reactivation may refer to the re-indication of the activation of the type 2 configured grant that has been previously configured and activated.

[0061] Refer to Figure 8 , regarding the case of activating or reactivating the type 2 configured grant in operation 810, the process continues from operation 820 to operation 830. However, in an embodiment, when the type 2 configured grant is deactivated and cleared, the operation of clearing the HARQ buffer can be performed according to the operation of the configured grant timer described in operations 820 and 830.

[0062] Figure 9The operation of the terminal according to an embodiment of the present disclosure performing autonomous retransmission at the time point when the configured grant is configured or reconfigured is shown. When the configured grant resource is configured, the base station may partially change the configuration of the configured grant due to a change in the channel state of the terminal, a change in the amount of data processed by the base station, or various other reasons. The configuration change may be configured or reconfigured by an RRC reconfiguration message (or higher layer signaling). In the case of a type 1 configured grant, the information that can be configured or reconfigured by the RRC reconfiguration message may include the size of the MAC PDU (transport block) of the configured grant, the location of the transmission resource, information about the modulation and coding scheme (MCS), etc. In the case of a type 1 configured grant and a type 2 configured grant, the period of the configured grant may be reconfigured by the RRC reconfiguration message. When the type 1 configured grant is configured or reconfigured in operation 910, since the characteristics of the configured grant resource have changed, even if autonomous retransmission has been configured as described in Figure 3 it is not possible to send, through autonomous retransmission, the MAC PDUs that have been obtained but not yet sent because the priority of the previous configured grant resource has decreased. To this end, in operation 920, it may be identified whether autonomous retransmission is configured for the corresponding configured grant. If autonomous retransmission is configured for the configured grant when the configured grant is configured or reconfigured, then in operation 930, the HARQ buffer of the HARQ process among the HARQ processes for the corresponding configured grant in which the configured grant timer is not running may be emptied (buffer flushing). For example, if the HARQ process IDs of the HARQ processes used by a predetermined configured grant are 0, 1, and 2 and the configured grant timer of HARQ process ID 1 is running, then the HARQ buffers of the HARQ processes for HARQ process ID 0 and HARQ process ID 2 in which the configured grant timer is not running may be emptied (or flushed). In some embodiments, in operation 930, an operation of emptying the HARQ buffer of the HARQ process among the HARQ processes for the corresponding configured grant in which the configured grant timer is not running, which starts from the resources allocated using the C-RNTI or CS-RNTI, may be performed. As described in Figure 4 since transmission in the dynamic grant is currently performed in the HARQ process in which the configured grant timer is running, if the HARQ buffer is emptied (or flushed), data loss may occur in the HARQ process in which the transmission is performed. Therefore, the HARQ buffer of the HARQ process in which the configured grant timer is running cannot be emptied (or flushed).

[0063] In some embodiments, there may be no difference in the configuration method between the configured grant configuration and its reactivation, and the reactivation may refer to the re-indication of the activation of the configured grant that has been previously configured and activated.

[0064] Reference Figure 9 , regardless of whether the configured grant in operation 910 is a type 1 configured grant or a type 2 configured grant, the process continues from operation 920 to operation 930. However, in an embodiment, the operation of emptying the HARQ buffer according to the configured grant timer described in operation 930 can be performed only when a type 1 configured grant is configured or reconfigured. In Figure 9 an embodiment, operations 920 and 930 can be performed in the case where the configured grant is configured or reconfigured in operation 910. However, in an embodiment, when the configured grant is released or cleared, the operation of emptying the HARQ buffer can be performed according to the operation of the configured grant timer described in operations 920 and 930.

[0065] Figure 10 FIG. shows operations in which a terminal considers the (re)activation or (re)configuration of resources when performing an autonomous retransmission according to an embodiment of the present disclosure. When the configured grant resources have been configured, the base station may partially change the configuration of the configured grant based on a change in the channel state of the terminal, a change in the amount of data processed by the base station, or various other reasons. This configuration change may be configured via an RRC reconfiguration message, and a type 2 configured grant may be reconfigured via DCI of a physical downlink control channel (PDCCH) using an activation instruction. Here, the reconfigurable information may include the size of the MAC PDU (transport block) of the configured grant, information regarding a modulation and coding scheme (MCS), and so on.

[0066] Thus, when the configured grant resources are reconfigured via an RRC reconfiguration message or the activation or reactivation of a type 2 configured grant, the configured grant needs to be a resource capable of transmitting the MAC PDUs that have been obtained and stored in the HARQ buffer in order to perform an autonomous retransmission.

[0067] Reference Figure 10, in operation 1010, it is assumed that the conditions for autonomous retransmission of the configured grant in the MAC device (or entity) are met. The conditions may indicate that the uplink configured grant is a prioritized uplink grant, autonomous retransmission has been configured for the configured grant, the priority of the previously configured grant resource of the previous corresponding HARQ process has been reduced, or the MAC PDU has not been transmitted yet even though the MAC PDU has been obtained and is currently stored in the HARQ buffer. However, the situation where the conditions for autonomous retransmission of the configured grant are met may indicate that the uplink grant is a configured grant with autonomous retransmission configured, the priority of the previously configured grant resource of the previous corresponding HARQ process has been reduced, or the MAC PDU has not been transmitted yet even though the MAC PDU has been obtained and is currently stored in the HARQ buffer.

[0068] Here, in operation 1020, it can be identified whether the size of the MAC PDU stored in the HARQ buffer matches the size of the allocated configured grant. This identification is related to whether the stored MAC PDU can be transmitted to the corresponding configured grant, and thus one of the following two methods can be applied.

[0069] Method 1: The size of the stored MAC PDU matches the size of the MAC PDU that can be transmitted in the allocated configured grant. In this case, since the configuration of the configured grant has not changed or its configuration has changed to have the same size as the stored MAC PDU, the MAC PDU can be transmitted in the configured grant as it is.

[0070] Method 2: The size of the stored MAC PDU is equal to or less than the size of the MAC PDU that can be transmitted in the allocated configured grant. In this case, since the configuration of the configured grant has not changed or the MAC PDU size of the configured grant has changed to be larger than the previously configured size, the MAC PDU can be transmitted in the configured grant as it is. If the size of the MAC PDU that can be transmitted in the configured grant is larger than the size of the stored MAC PDU, padding can be included in the resources remaining after the stored MAC PDU.

[0071] If the size of the MAC PDU already stored in the HARQ buffer matches the size of the allocated configured grant, the MAC PDU is considered to have been obtained in operation 1030, and when the configured grant is a prioritized uplink grant, the transmission of the MAC PDU can be performed in the configured grant resources. Here, performing the transmission of the MAC PDU can be expressed as triggering a new transmission for the HARQ process. An autonomous retransmission can be performed due to operation 1030.

[0072] Otherwise, if the size of the MAC PDU already stored in the HARQ buffer does not match the size of the allocated configured grant, in operation 1040, when the configured grant is a prioritized uplink grant, obtain the MAC PDU from the multiplexing / assembly device (or entity) and perform the transmission of the MAC PDU. This can be expressed as a new transmission for the newly obtained MAC PDU being triggered because the MAC PDU is obtained rather than performing an autonomous retransmission.

[0073] Figure 11 Operations are shown in which a terminal considers the (re)activation or (re)configuration of resources when performing an autonomous retransmission according to an embodiment of the present disclosure. When the configured grant resources have been configured, the base station can partially change the configuration of the configured grant due to a change in the channel state of the terminal, a change in the amount of data processed by the base station, or various other reasons. This configuration change can be configured through an RRC reconfiguration message, or in the case of a type 2 configured grant, its configuration can be reconfigured through a DCI of a physical downlink control channel (PDCCH) using an activation instruction. Here, the reconfigurable information can include the size of the MAC PDU (transport block) of the configured grant, information about the modulation and coding scheme (MCS), and so on.

[0074] Thus, when the configured resources are reconfigured through an RRC reconfiguration message or the activation or reactivation of a type 2 configured grant, the configured CG needs to be a resource capable of transmitting the MAC PDU that has been obtained and stored in the HARQ buffer in order to perform an autonomous retransmission.

[0075] Reference Figure 11, in operation 1110, it is assumed that the conditions for autonomous retransmission of the configured grant in the MAC device (or entity) are met. This may indicate that the uplink configured grant is a prioritized uplink grant, autonomous retransmission has been configured for the configured grant, the priority of the previously configured grant resource of the previous corresponding HARQ process has been reduced, or the MAC PDU has not been transmitted yet even though the MAC PDU has been obtained and is currently stored in the HARQ buffer. However, in an embodiment, the situation where the conditions for autonomous retransmission of the configured grant are met may indicate that the uplink grant is a configured grant with autonomous retransmission configured, the priority of the previously configured grant resource of the previous corresponding HARQ process has been reduced, or the MAC PDU has not been transmitted yet even though the MAC PDU has been obtained and is currently stored in the HARQ buffer.

[0076] Here, in operation 1120, it can be identified whether the size of the MAC PDU stored in the HARQ buffer matches the size of the allocated configured grant. This identification is an operation on the condition of whether the stored MAC PDU can be transmitted to the corresponding configured grant. If operation 1120 is satisfied, this may indicate that the configuration of the configured grant has not changed, or the size of the MAC PDU of the configured grant has changed to be larger than the MAC PDU size in the previous configuration. Therefore, the MAC PDU can be transmitted in the configured grant as it is. If the size of the MAC PDU that can be transmitted in the configured grant is larger than the size of the stored MAC PDU, padding can be included in the resources remaining after including the stored MAC PDU.

[0077] If the size of the MAC PDU stored in the HARQ buffer is equal to or less than the size of the allocated configured grant, then in operation 1130, it is considered that the MAC PDU has been obtained, and when the configured grant is a prioritized uplink grant, the transmission of the MAC PDU can be performed in the configured grant resources. Here, performing the transmission of the MAC PDU can be expressed as triggering a new transmission for the HARQ process. Autonomous retransmission can be performed due to operation 1130.

[0078] Otherwise, if the size of the MAC PDU stored in the HARQ buffer is larger than the size of the allocated configured grant, then in operation 1140, when the configured grant is a prioritized uplink grant, the MAC PDU is obtained from the multiplexing / assembly device (or entity), and the transmission of the MAC PDU can be performed. This may indicate that a new transmission for the newly obtained MAC PDU is triggered because the MAC PDU is obtained instead of performing autonomous retransmission.

[0079] Figure 12 Illustrates the operation in which a terminal considers the (re)activation or (re)configuration of resources when performing an autonomous retransmission according to an embodiment of the present disclosure. When the configured grant resources have been configured, the base station may partially change the configuration of the configured grant due to a change in the channel state of the terminal, a change in the amount of data processed by the base station, or various other reasons. This configuration change may be configured through an RRC reconfiguration message, or in the case of a type 2 configured grant, its configuration may be reconfigured through a DCI activation instruction of a physical downlink control channel (PDCCH). Here, the reconfigurable information may include the size of the MAC PDU (transport block) of the configured grant, information about the modulation and coding scheme (MCS), and so on.

[0080] Therefore, when the configured resources are reconfigured through an RRC reconfiguration message or the activation or reactivation of a type 2 configured grant, the configured CG needs to be a resource capable of transmitting the MAC PDU that has been obtained and stored in the HARQ buffer in order to perform an autonomous retransmission.

[0081] Reference Figure 12 , in operation 1210, it is assumed that the conditions for autonomous retransmission of the configured grant in the MAC device (or entity) are met. This may indicate that the uplink configured grant is a prioritized uplink grant, autonomous retransmission has been configured for the configured grant, the priority of the previous configured grant resources of the previous corresponding HARQ process has been reduced, or the MAC PDU has not been transmitted even though the MAC PDU has been obtained and is currently stored in the HARQ buffer. However, in an embodiment, meeting the conditions for autonomous retransmission of the configured grant may indicate that the uplink grant is a configured grant for which autonomous retransmission is configured, the priority of the previous configured grant resources of the previous corresponding HARQ process has been reduced, or the MAC PDU has not been transmitted even though the MAC PDU has been obtained and is currently stored in the HARQ buffer.

[0082] Here, in operation 1220, it is possible to identify whether the size of the MAC PDU already stored in the HARQ buffer is equal to or less than the size of the allocated configured grant. This identification is an operation for identifying the condition regarding whether the stored MAC PDU is transmittable within the corresponding configured grant. If operation 1220 is satisfied, this may indicate that the configuration of the configured grant has not changed, or the size of the MAC PDU of the configured grant has changed to be larger than the MAC PDU size in the previous configuration. Therefore, the MAC PDU can be sent within the configured grant as it is. If the size of the MAC PDU transmittable within the configured grant resource is larger than the size of the stored MAC PDU, then additionally the MAC SDU (or MAC SubPDU) is included in the remaining resources after the inclusion of the stored MAC PDU or padding can be included therein.

[0083] If the size of the MAC PDU already stored in the HARQ buffer is equal to or less than the size of the allocated configured grant, then in operation 1230, the MAC SDU (or MAC SubPDU) is obtained from the multiplexing / assembly device (or entity) for the remaining part of the currently stored MAC PDU to configure the MAC PDU, and when the configured grant is a prioritized uplink grant, the transmission of the MAC PDU can be performed within the configured grant resource. Here, performing the transmission of the MAC PDU can be expressed as triggering a new transmission for the HARQ process. If the MAC SDU (or MAC SubPDU) is additionally obtained, then it can be considered that the entire MAC PDU is obtained. Operation 1230 can produce the same effect as when autonomously retransmitting the MAC PDU that has been stored for autonomous retransmission. For example, if the size of the stored MAC PDU is 300 bytes and if the size of the MAC PDU transmittable within the configured grant is 500 bytes, then the MAC SDU (or MAC SubPDU) can be obtained from the multiplexing / assembly device (or entity) for the remaining 200 bytes, thus obtaining 500 bytes of the MAC PDU that will ultimately be sent.

[0084] Otherwise, if the size of the MAC PDU already stored in the HARQ buffer is larger than the size of the allocated configured grant, then in operation 1240, when the configured grant is a prioritized uplink grant, the MAC PDU is obtained from the multiplexing / assembly device (or entity), and the transmission of the MAC PDU can be performed. This can indicate that a new transmission for the newly obtained MAC PDU is triggered because the MAC PDU is obtained instead of performing an autonomous retransmission.

[0085] Figure 13Shows the operation of a terminal considering the (re)activation or (re)configuration of resources when performing autonomous retransmission according to an embodiment of the present disclosure. When the configured grant resources have been configured, the base station may partially change the configuration of the configured grant due to a change in the channel state of the terminal, a change in the amount of data processed by the base station, or various other reasons. This configuration change may be configured through an RRC reconfiguration message (or higher layer signaling), or in the case of a type 2 configured grant, its configuration may be reconfigured through DCI (or L1 signaling) of a physical downlink control channel (PDCCH) channel with an activation instruction. Here, the reconfigurable information may include the size of the MAC PDU (transport block) of the configured grant, information about the modulation and coding scheme (MCS), and so on.

[0086] Therefore, when the configured resources are reconfigured through an RRC reconfiguration message or the activation or reactivation of a type 2 configured grant, the configured CG needs to be a resource capable of transmitting the MAC PDU that has been obtained and stored in the HARQ buffer in order to perform autonomous retransmission.

[0087] Refer to Figure 13 , in operation 1310, it is assumed that the conditions for autonomous retransmission of the configured grant in the MAC device (or entity) are satisfied. This may indicate that the uplink configured grant is a prioritized uplink grant, autonomous retransmission has been configured for the configured grant, the priority of the previous configured grant resources of the previous corresponding HARQ process has been reduced, or the MAC PDU has not been transmitted even though the MAC PDU has been obtained and is currently stored in the HARQ buffer. However, in an embodiment, the situation where the conditions for autonomous retransmission of the configured grant are satisfied may indicate that the uplink grant is a configured grant for which autonomous retransmission has been configured, the priority of the previous configured grant resources of the previous corresponding HARQ process has been reduced, or the MAC PDU has not been transmitted even though the MAC PDU has been obtained and is currently stored in the HARQ buffer.

[0088] Here, in operation 1320, it can be recognized whether the size of the MAC PDU already stored in the HARQ buffer is equal to or less than the size of the allocated configured grant. That is, this recognition is an operation for recognizing the condition regarding whether the stored MAC PDU can be transmitted to the corresponding configured grant. If operation 1320 is satisfied, this can indicate that the configuration of the configured grant has not changed, or the size of the MAC PDU of the configured grant has changed to be larger than the MAC PDU size in the previous configuration. Therefore, the MAC PDU can be sent in the configured grant as it is. If the size of the MAC PDU that can be transmitted in the configured grant is larger than the size of the stored MAC PDU, then additionally the MAC SDU (or MAC SubPDU) is included in the resources remaining after the inclusion of the stored MAC PDU or padding can be included therein.

[0089] If the size of the MAC PDU already stored in the HARQ buffer is equal to or less than the size of the allocated configured grant, then in operation 1330, the MAC SDU (or MAC SubPDU) is obtained from the multiplexing / assembly device (or entity) for the remaining part of the currently stored MAC PDU to configure the MAC PDU, and when the configured grant is a prioritized uplink grant, the transmission of the MAC PDU can be performed in the configured grant resources. Here, performing the transmission of the MAC PDU can be expressed as triggering a new transmission for the HARQ process. If the MAC SDU (or MAC SubPDU) is additionally obtained, then it can be considered that the entire MAC PDU has been obtained. Operation 1330 can produce the same effect as when autonomously retransmitting the MAC PDU that has been stored for the autonomous retransmission. For example, if the size of the stored MAC PDU is 300 bytes and if the size of the MAC PDU that can be transmitted in the configured grant resources is 500 bytes, then the MAC SDU (or MAC SubPDU) can be obtained from the multiplexing / assembly device (or entity) for the remaining 200 bytes, thus obtaining 500 bytes of the MAC PDU that will ultimately be sent.

[0090] Otherwise, if the size of the MAC PDU already stored in the HARQ buffer is greater than the size of the allocated configured grant, in operation 1340, the terminal may instruct the multiplexing / assembly device (or entity) to include the MAC SubPDUs included in the currently stored MAC PDU and obtain the MAC PDU, and may send the MAC PDU when the configured grant is a prioritized uplink grant. This may indicate that a new transmission of the newly obtained MAC PDU is triggered because the MAC PDU is obtained rather than performing an autonomous retransmission, thus producing the same effect as when autonomously retransmitting a part of the MAC PDU that has been stored for autonomous retransmission.

[0091] Figure 14 Operations are shown in which a terminal considers the (re)activation or (re)configuration of resources when performing an autonomous retransmission, according to an embodiment of the present disclosure. When the configured grant resources have been configured, the base station may partially change the configuration of the configured grant due to a change in the channel state of the terminal, a change in the amount of data processed by the base station, or various other reasons. This configuration change may be configured by an RRC reconfiguration message (or higher layer signaling), or in the case of a type 2 configured grant, its configuration may be reconfigured by DCI (or L1 signaling) of a physical downlink control channel (PDCCH) with an activation instruction. Here, the reconfigurable information may include the size of the MAC PDU (transport block) of the configured grant, information about the modulation and coding scheme (MCS), and so on.

[0092] Thus, when the configured resources are reconfigured by an RRC reconfiguration message or the activation or reactivation of a type 2 configured grant, the configured CG needs to be a resource capable of transmitting the MAC PDUs that have been obtained and stored in the HARQ buffer in order to perform an autonomous retransmission.

[0093] Reference Figure 14, in operation 1410, it is assumed that the conditions for autonomous retransmission of the configured grant in the MAC device (or entity) are met. This can indicate that the uplink configured grant is a prioritized uplink grant, autonomous retransmission has been configured for the configured grant, the priority of the previously configured grant resource of the previous corresponding HARQ process has been reduced, or the MAC PDU has not been transmitted yet even though the MAC PDU has been obtained and is currently stored in the HARQ buffer. However, in an embodiment, the situation where the conditions for autonomous retransmission of the configured grant are met can indicate that the uplink grant is a configured grant with autonomous retransmission configured, the priority of the previously configured grant resource of the previous corresponding HARQ process has been reduced, or the MAC PDU has not been transmitted yet even though the MAC PDU has been obtained and is currently stored in the HARQ buffer.

[0094] Here, in operation 1420, it can be identified whether the size of the MAC PDU stored in the HARQ buffer is equal to or less than the size of the allocated configured grant. This identification is an operation regarding the condition of whether the stored MAC PDU can be transmitted to the corresponding configured grant. If operation 1420 is satisfied, this can indicate that the configuration of the configured grant has not changed, or the size of the MAC PDU of the configured grant has changed to be larger than the size of the MAC PDU in the previous configuration. Therefore, the MAC PDU can be transmitted in the configured grant as it is. If the size of the MAC PDU that can be transmitted in the configured grant resource is larger than the size of the stored MAC PDU, padding can be included in the resources remaining after including the stored MAC PDU. In some embodiments, in operation 1420, identifying whether the size of the MAC PDU stored in the HARQ buffer matches the size of the allocated configured grant can be the same as identifying whether the size of the MAC PDU stored in the HARQ buffer is equal to or less than the size of the allocated configured grant.

[0095] If the size of the MAC PDU stored in the HARQ buffer is less than or equal to the size of the allocated configured grant, then in operation 1430, it is considered that the MAC PDU has been obtained, and when the configured grant is a prioritized uplink grant, the MAC PDU transmission can be performed. Here, performing the transmission of the MAC PDU can be expressed as triggering a new transmission for the HARQ process. Due to operation 1430, autonomous retransmission can be performed.

[0096] Otherwise, if the size of the MAC PDU stored in the HARQ buffer is greater than the size of the allocated configured grant, in operation 1440, the terminal may indicate to the multiplexing / assembly device (or entity) to include the MAC SubPDUs included in the currently stored MAC PDU and obtain the MAC PDU, and may send the MAC PDU when the configured grant is a prioritized uplink grant. This may indicate that a new transmission of the newly obtained MAC PDU is triggered because the MAC PDU is obtained instead of performing an autonomous retransmission, thus producing the same effect as when autonomously retransmitting a part of the MAC PDU that has been stored for autonomous retransmission.

[0097] Figure 15 Shows the structure of a terminal according to an embodiment of the present disclosure.

[0098] Reference Figure 15 , the terminal may include a transceiver 1510, a controller 1520, and a memory 1530. In the present disclosure, the controller may be defined as a circuit, an application specific integrated circuit, or at least one processor.

[0099] The transceiver 1510 may send signals to another network entity or receive signals from another network entity. The transceiver 1510 may, for example, receive system information from a base station and may receive a synchronization signal or a reference signal.

[0100] The controller 1520 may control the overall operation of the terminal according to an embodiment proposed in the present disclosure. For example, the controller 1520 may control the signal flow between the corresponding blocks to perform the operations according to the flowchart described above.

[0101] The memory 1530 may store at least one of the information transmitted and received through the transceiver 1510 and the information generated through the controller 1520.

[0102] Figure 16 Shows the structure of a base station according to an embodiment of the present disclosure.

[0103] Reference Figure 16 , the base station may include a transceiver 1610, a controller 1620, and a memory 1630. In the present disclosure, the controller 1620 may be defined as a circuit, an application specific integrated circuit, or at least one processor.

[0104] The transceiver 1610 may send signals to another network entity or receive signals from another network entity. The transceiver 1610 may, for example, send system information to a terminal and may send a synchronization signal or a reference signal.

[0105] The controller 1620 may control the overall operation of the base station according to an embodiment proposed in the present disclosure. For example, the controller 1620 may control the signal flow between the corresponding blocks to perform operations according to the procedures described above.

[0106] The memory 1630 may store at least one of the information transmitted and received through the transceiver 1610 and the information generated through the controller 1620.

[0107] Although the present disclosure has been shown and described with reference to its various embodiments, those skilled in the art will understand that various changes in form and detail may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a terminal in a communication system, the method comprising: Receiving, from a base station, configuration information about a configured grant for uplink transmission; Based on the configuration information about the configured grant, identifying that the configured grant is configured with autonomous transmission; In a case where a previously configured grant for a hybrid automatic repeat request (HARQ) process is not prioritized, transmission of a first medium access control (MAC) protocol data unit (PDU) obtained for the HARQ process has not been performed, and the size of the first MAC PDU matches the size of the configured grant, considering that the first MAC PDU has been obtained for the configured grant; And In a case where the configured grant is a prioritized uplink grant, transmitting the obtained first MAC PDU based on the configured grant; In a case where the size of the first MAC PDU does not match the size of the configured grant and the configured grant is a prioritized uplink grant, obtaining a second MAC PDU to be sent from a multiplexing and assembling entity, and transmitting the obtained second MAC PDU; In a case where the configured grant is of type 2 and reconfiguration information about the configured grant of type 2 is provided by downlink control information (DCI) on a physical downlink control channel (PDCCH), identifying whether a configured grant timer is running for at least one HARQ process of the configured grant of type 2; In a case where the configured grant timer is not running for at least one HARQ process of the configured grant of type 2, flushing a HARQ buffer associated with the at least one HARQ process.

2. The method according to claim 1, wherein, Transmitting the obtained first MAC PDU further comprises: Instructing the HARQ process to trigger a new transmission.

3. The method according to claim 1, wherein, The first MAC PDU is stored in a HARQ buffer associated with the HARQ process.

4. The method according to claim 1, wherein The configuration information is received via radio resource control (RRC) signaling, wherein the configuration information includes at least one of periodicity information of the configured grant, a HARQ process identifier (ID) offset, and the number of HARQ processes.

5. The method according to claim 4, wherein The HARQ process is identified based on the HARQ process ID offset of the configured grant and the number of HARQ processes, wherein a HARQ process associated with the configured grant is equal to a HARQ process associated with the previously configured grant.

6. The method according to claim 1, wherein, In a case where the configured grant is of type 1, information about resources for the configured grant is configured via RRC signaling.

7. The method according to claim 1, Among them, In a case where the configured grant is of type 2, information about resources for the configured grant is further provided by the DCI on the PDCCH.

8. The method according to claim 1, wherein In a case where the size of the first MAC PDU is equal to the size of the configured grant, the size of the first MAC PDU matches the size of the configured grant.

9. The method according to claim 1, wherein In the case where the size of the first MAC PDU is less than or equal to the size of the configured grant, the size of the first MAC PDU matches the size of the configured grant.

10. A terminal in a communication system, the terminal comprising: a transceiver; and a controller, the controller being connected to the transceiver and configured to: receive configuration information about a configured grant for uplink transmission from a base station, identify, based on the configuration information about the configured grant, that the configured grant is configured with autonomous transmission, in the case where a previously configured grant for a hybrid automatic repeat request (HARQ) process has not been prioritized, transmission of a first medium access control (MAC) protocol data unit (PDU) obtained for the HARQ process has not been performed, and the size of the first MAC PDU matches the size of the configured grant, consider that the first MAC PDU has been obtained for the configured grant, in the case where the configured grant is a prioritized uplink grant, transmit the obtained first MAC PDU based on the configured grant, in the case where the size of the first MAC PDU does not match the size of the configured grant and the configured grant is a prioritized uplink grant, obtain a second MAC PDU to be sent from a multiplexing and assembly entity and transmit the obtained second MAC PDU, in the case where the configured grant is of type 2 and reconfiguration information about the configured grant of type 2 is provided by downlink control information (DCI) on a physical downlink control channel (PDCCH), identify whether a configured grant timer is running for at least one HARQ process of the configured grant of type 2, if the configured grant timer is not running for at least one HARQ process of the configured grant of type 2, flush a HARQ buffer associated with the at least one HARQ process.

11. The terminal according to claim 10, wherein, The controller is further configured to instruct the HARQ process to trigger a new transmission.

12. The terminal according to claim 10, Among them, The first MAC PDU is stored in a HARQ buffer associated with the HARQ process.

13. The terminal according to claim 10, wherein, The configuration information is received by radio resource control (RRC) signaling, wherein the configuration information includes at least one of periodic information of the configured grant, a HARQ process identifier (ID) offset, and the number of HARQ processes.

14. The terminal according to claim 13, Among them, The HARQ process is identified based on the HARQ process ID offset of the configured grant and the number of the HARQ processes, wherein the HARQ process associated with the configured grant is equal to the HARQ process associated with the previously configured grant.

15. The terminal according to claim 10, Among them, in the case where the configured grant is of type 1, information about resources for the configured grant is configured by RRC signaling.

16. The terminal according to claim 10, Among them, When the configured license is of type 2, information about the resources for the configured license is further provided by DCI on the PDCCH.

17. The terminal according to claim 10, wherein, When the size of the first MAC PDU is equal to the size of the configured license, the size of the first MAC PDU matches the size of the configured license.

18. The terminal according to claim 10, wherein, When the size of the first MAC PDU is less than or equal to the size of the configured license, the size of the first MAC PDU matches the size of the configured license.

Images