Method and apparatus of indicating alternative resource at collision of configured grants

Abstract

The present disclosure relates to a communication technique and a system for integrating a 5G communication system with IoT technology to support higher data transmission rates than those of 4G systems. The present disclosure may be applied to intelligent services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail, security and safety-related services, etc.) based on 5G communication technology and IoT-related technology. The present disclosure provides a method and apparatus for directing an alternative resource in the event of a conflict in a configured grant.

Description

Technology Field

[0001] The present disclosure provides a method and apparatus for indicating an alternative resource in the event of a conflict in a configured grant. Background Technology

[0002] Efforts are being made to develop improved 5G or pre-5G communication systems to meet the increasing demand for wireless data traffic since the commercialization of 4G communication systems. For this reason, 5G or pre-5G communication systems are referred to as systems beyond the 4G network or systems following the LTE system. To achieve high data transmission rates, the implementation of 5G communication systems in the mmWave band (e.g., the 60 GHz band) is being considered. To mitigate path loss and increase transmission distance in the mmWave band, technologies such as beamforming, massive MIMO, full Dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and large-scale antennas are being discussed for 5G communication systems. In addition, to improve the network of the system, the development of technologies such as advanced small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network, Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation is taking place in 5G communication systems.In addition, advanced coding modulation (ACM) methods such as FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), as well as advanced access technologies such as FBMC (Filter Bank Multi Carrier), NOMA (non-orthogonal multiple access), and SCMA (sparse code multiple access), are being developed in 5G systems.

[0003] Meanwhile, the Internet is evolving from a human-centric network where humans generate and consume information into an IoT (Internet of Things) network that processes information by exchanging it among distributed components, such as objects. IoE (Internet of Everything) technology, which combines IoT with Big Data processing technologies through connections with cloud servers, is also emerging. To implement IoT, technological elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required; consequently, technologies such as sensor networks, Machine-to-Machine (M2M) communication, and Machine-Type Communication (MTC) are currently being researched to facilitate the connection of objects. In an IoT environment, intelligent IT services that create new value for human life by collecting and analyzing data generated from connected objects can be provided. Through the convergence and integration of existing IT technologies with various industries, IoT can be applied to fields such as smart homes, smart buildings, smart cities, smart or connected cars, smart grids, healthcare, smart home appliances, and advanced medical services.

[0004] Accordingly, various attempts are being made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, Machine to Machine (M2M), and Machine Type Communication (MTC) are being implemented using 5G communication techniques such as beamforming, MIMO, and array antennas. The application of cloud RAN as a big data processing technology, as previously described, can also be considered an example of the convergence of 5G and IoT technologies. The problem to be solved

[0005] The present disclosure provides a method and apparatus for indicating an alternative resource in the event of a conflict in a configured grant. means of solving the problem

[0006] The present invention, for solving the above-mentioned problems, is characterized in that a method for processing a control signal in a wireless communication system comprises: a step of receiving a first control signal transmitted from a base station; a step of processing the received first control signal; and a step of transmitting a second control signal generated based on the processing to the base station. Effects of the invention

[0007] According to the embodiments disclosed in this disclosure, alternative resources can be set when configured grants conflict. Brief explanation of the drawing

[0008] Figure 1 is a diagram showing an example of how Configured Grant is set up. Figure 2 is a diagram showing an example of multiple Configured Grants being set. Figure 3 is a diagram showing an example where multiple Configured Grants overlap. Figure 4 is a diagram showing the operation of configuring Configured Grant. Figure 5 is a diagram showing the method for setting the priority of a Configured Grant. FIG. 6 is a diagram showing a processing method for when Configured Grants proposed in the present invention overlap. FIG. 7 is a diagram showing the detailed operation of an alternative resource setting method when the Configured Grant proposed in the present invention overlaps. FIG. 8 is a diagram showing the detailed operation of an alternative resource setting method when the Configured Grant proposed in the present invention overlaps. Figure 9 is a diagram showing a method of indicating alternative resources. FIG. 10 is a diagram showing an embodiment in which a base station sets up simultaneous transmission. FIG. 11 is a drawing illustrating the structure of a terminal according to one embodiment of the present invention. FIG. 12 is a drawing illustrating the structure of a base station according to one embodiment of the present invention. FIGS. 13 and 14 are flowcharts illustrating alternative resource transfer methods when Configured Grants overlap according to various embodiments of the present invention. Specific details for implementing the invention

[0009] The operating principle of the present invention will be described in detail below with reference to the attached drawings. In describing the present invention below, specific descriptions of related known functions or configurations will be omitted if it is determined that such detailed descriptions would unnecessarily obscure the essence of the invention. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intentions or conventions of the user or operator. Therefore, their definitions should be based on the content throughout this specification.

[0010] In the following description of the present invention, specific descriptions of related known functions or configurations will be omitted if it is determined that such detailed descriptions may unnecessarily obscure the essence of the invention. Embodiments of the present invention will be described below with reference to the attached drawings.

[0011] Terms used in the following description to identify connection nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, etc., are examples provided for the convenience of explanation. Accordingly, the present invention is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.

[0012] For convenience of explanation, the present invention uses terms and names defined in the 3GPP LTE (3rd Generation Partnership Project Long Term Evolution) standard. However, the present invention is not limited by the above terms and names and can be applied equally to systems conforming to other standards. In the present invention, eNB may be used interchangeably with gNB for convenience of explanation. That is, a base station described as eNB may represent a gNB.

[0014] In the following description of the present invention, specific descriptions of related known functions or configurations will be omitted if it is determined that such detailed descriptions may unnecessarily obscure the essence of the invention. Embodiments of the present invention will be described below with reference to the attached drawings.

[0016] FIG. 1 illustrates an example of a Configured Grant being set. In the embodiment of FIG. 1, the Configured Grants (110, 120, 130, 140) are set to have a fixed period (150). A base station can set each Configured Grant to a terminal and can set the period, location of the wireless resource, size, modulation, coding rate, etc. Depending on the embodiment, these Configured Grants may be activated immediately upon setting or activated by a separate activation command. These Configured Grants may be assumed to have a fixed traffic pattern or be used for high-priority data. In some embodiments, the Configured Grant may be exclusively allocated to data with a short delay requirement. To this end, the base station can set whether a specific Configured Grant can be used for a specific logical channel to the terminal via an RRC configuration message. Depending on the embodiment, multiple Configured Grants may be set to a single terminal, and in this case, the period, location of the wireless resource, size, modulation, coding rate, etc. for each Configured Grant may all be set differently.

[0018] FIG. 2 illustrates an example in which multiple Configured Grants are configured. In the embodiment of FIG. 2, an example is shown in which two Configured Grants are configured: a first Configured Grant (CG1, 201, 202, 203, 204) and a second Configured Grant (CG2, 211, 212, 213, 214). However, it is also possible to configure three or more Configured Grants. In this case, the fact that different Configured Grants are configured means that the period, location, size, modulation, coding rate, etc., of the Configured Grant are configured separately, and that they are configured as the configuration of each Configured Grant. The location of the wireless resource can be configured by distinguishing between the time axis (210) and the frequency axis (220). The configuration of multiple Configured Grants in this manner may be for each Configured Grant to process data having different requirements, and in this case, the base station may configure a logical channel that can be transmitted using each Configured Grant.

[0020] FIG. 3 illustrates an example where multiple Configured Grants overlap. In the embodiment of FIG. 3, an example is shown where two Configured Grants are configured: a first Configured Grant (CG1, 301, 302, 303, 304) and a second Configured Grant (CG2, 311, 312, 313, 314). However, it is also possible to configure three or more Configured Grants. In this case, the fact that different Configured Grants are configured means that the period, location, size, modulation, coding rate, etc., of the Configured Grant are configured separately, and that they are configured as the configuration of each Configured Grant. The location of the wireless resource can be configured by distinguishing between the time axis (310) and the frequency axis (320). The configuration of multiple Configured Grants in this manner may be for each Configured Grant to process data having different requirements, and in this case, the base station may configure a logical channel that can be transmitted using each Configured Grant. At this time, the period of the first Configured Grant (305, 306, 307) and the period of the second Configured Grant (314, 315) are different, and the resources allocated in the time axis or the time and frequency axis overlap, so the first Configured Grant and the second Configured Grant may overlap. (330) In this case, how the terminal should handle the overlapping part may be a problem.

[0022] At this time, the terminal may need to select one of the two Configured Grants to perform transmission. In particular, for a terminal capable of transmitting only one wireless resource, it is inevitable that it must select one Configured Grant. As a method, for example, transmission corresponding to the first Configured Grant (304) may be performed and transmission corresponding to the second Configured Grant (313) may not be performed according to a pre-set condition. In some embodiments, transmission corresponding to the first Configured Grant (340) may be performed according to a pre-set condition only for the portion where resources overlap (330), and transmission corresponding to the second Configured Grant (330) may be performed normally for the portion where resources do not overlap. Which Configured Grant to select may be determined by deriving a pre-set relative priority for each Configured Grant, or it may be determined based on the type or amount of data the terminal possesses.

[0024] However, when a single Configured Grant is selected for transmission in this manner, one Configured Grant remains unused. Consequently, data that needs to be processed by the unused Configured Grant may not be transmitted in a timely manner, which can lead to performance degradation. Therefore, it is important to determine how to handle the transmission of data from unused Configured Grants.

[0026] FIG. 4 illustrates the operation of configuring a Configured Grant. A terminal (410) may receive a Configured Grant from a base station (420). This configuration may be performed by an RRC configuration message (430) sent from the base station to the terminal. The RRC configuration message may include a Configured Grant Configuration Information Element (IE), and each Configured Grant Configuration IE may configure the period of the Configured Grant, the location and size of the wireless resource, modulation, coding rate, whether to use a separate activation message, etc. In this case, if multiple Configured Grant Configuration IEs are received, the terminal may have multiple Configured Grants. Based on this, the Configured Grant transmission operation described in FIG. 1, 2, and 3 may be performed. If the terminal successfully receives the RRC configuration (420) message and completes the configuration, it may transmit an RRC configuration completion message (440) to the base station to convey that the terminal's configuration is complete.

[0028] FIG. 5 illustrates a method for setting the priority of a Configured Grant. As shown in FIG. 4, when a terminal receives a Configured Grant setting IE (510, 520) from a base station, a Configured Grant can be set. In the embodiment of FIG. 5, it is assumed that two Configured Grants are set by two Configured Grant setting IEs (510, 520), but the present invention is applicable even when three or more Configured Grants are set. Each Configured Grant can be assigned its own priority when configured. The Configured Grant corresponding to the first Configured Grant setting (510) is assigned a priority value of 1, and the Configured Grant corresponding to the second Configured Grant setting (520) is assigned a priority value of 2. Typically, a lower priority value can be interpreted as having a higher priority, but in some embodiments, a higher priority value can be interpreted as having a higher priority. The priority of the above Configured Grant can be used when the Configured Grant resources described in FIG. 3 overlap (330). When the priority of the first Configured Grant and the second Configured Grant overlap at step (330), the terminal can determine which Configured Grant will be used based on the priority of the Configured Grant. Specifically, if the priority of the first Configured Grant is higher than the priority of the second Configured Grant, the first Configured Grant may be used.In the embodiment of FIG. 5, since the priority value of the first Configured Grant is low, it can be interpreted as having a high priority, and the first Configured Grant can be used.

[0030] FIG. 6 illustrates a method for handling overlapping Configured Grants proposed in the present invention. In the embodiment of FIG. 6, it is assumed that a total of two Configured Grants are configured, namely the first Configured Grant (613, 615) and the second Configured Grant (623, 625), but it is also possible to apply this method when three or more Configured Grants are configured. If different Configured Grants overlap in the time axis, or in the time and frequency axes (630), a terminal capable of transmitting only one wireless resource must select and transmit one of the resources. However, if all resources to be transmitted via the Configured Grant are important, and only one Configured Grant is selected for transmission, the transmission performance of the data that must be transmitted via the Configured Grant that is not selected and cannot be transmitted will inevitably be degraded. Therefore, when the data to be transmitted via the Configured Grant is important, an Alternative Resource (640) is provided for the resources that are not selected and cannot be transmitted, thereby reducing the degradation of transmission performance. In the embodiment of FIG. 6, this can be described as a shift of resources, whereby the physical resource (625) that was actually scheduled to be transferred is moved to a physical resource (640) in another location.

[0032] The base station may specify an alternative resource to be used when a configured grant overlaps with another configured grant in the time axis or in both the time and frequency axes to the terminal. This can be configured by RRC settings to move resources when they overlap, and can set the size, modulation, coding rate, and rules for the moved resource to be used—for example, information such as how far from the overlapping resource in the time and frequency axes when a resource that cannot be used due to overlapping occurs. Such settings may be conveyed by configured grant settings (510, 520), etc., within an RRC setting message (430). In other embodiments, such alternative resources may be specified by pre-set rules. The rules for the alternative resources may include which resources to use and which not to use when configured grant resources overlap, and where the alternative resources for the unused configured grant will be located.

[0034] FIG. 7 illustrates the detailed operation of the alternative resource setting method when the Configured Grants proposed in the present invention overlap. In the embodiment of FIG. 7, it is assumed that a total of two Configured Grants are set, namely the first Configured Grant (710) and the second Configured Grant (720), but it is also possible to apply this method when three or more Configured Grants are set. If different Configured Grants overlap in the time axis, or in the time and frequency axis (730), a terminal capable of transmitting only one wireless resource must select and transmit one of the two resources. However, if all resources to be transmitted via the Configured Grant are important, and only one Configured Grant is selected for transmission, the transmission performance of the data that must be transmitted via the Configured Grant that is not selected and cannot be transmitted will inevitably be degraded. Therefore, when the data to be transmitted via the Configured Grant is important, an alternative resource (740) for the resource transmitted via the Configured Grant that is not selected and cannot be transmitted can be provided to reduce the degradation of transmission performance.

[0036] To this end, the location of an alternative resource to be moved to a reference (720) for unused resources can be specified. In the embodiment of FIG. 7, it is assumed that the first Configured Grant (710) has priority, and the second Configured Grant (720), which has become unusable, uses an alternative resource. At this time, which Configured Grant will have priority can be determined in advance, and based on the priority of the logical channels that can use each Configured Grant, the Configured Grant that can be used by the logical channel with the higher priority may be prioritized. In some embodiments, the priority of the logical channel may be applied regardless of whether the logical channel actually has data to transmit. However, in some embodiments, when using an alternative resource, it may be determined which Configured Grant to use as is and which Configured Grant to move to an alternative resource based on the Configured Grant index value—for example, the Configured Grant with the smaller index value has priority. At this time, an alternative resource (740) for the resource (720) of the 2nd Configured Grant is set, which can be done by setting a time shift value (750) and a frequency shift value (760) from the location (720) of the existing resource. At this time, the unit of the time shift value (750) can be absolute time (symbol, slot, subframe, etc.). Also, the unit of the frequency shift value (760) can be Hertz (Hz), number of subcarriers, resource blocks, etc. Furthermore, the alternative resource may be the same Bandwidth Part (BWP) as the existing resource or a different BWP.To provide this information, the location of the resource can be indicated by including the BWP ID, Cell ID, SCell index, etc.

[0038] FIG. 8 illustrates the detailed operation of the alternative resource setting method when the Configured Grants proposed in the present invention overlap. In the embodiment of FIG. 8, it is assumed that a total of two Configured Grants are set, namely the first Configured Grant (810) and the second Configured Grant (820), but it is also possible to apply this method when three or more Configured Grants are set. If different Configured Grants overlap in the time axis, or in the time and frequency axis (830), a terminal capable of transmitting only one wireless resource must select and transmit one of the two resources. However, if all resources to be transmitted via the Configured Grant are important, and only one Configured Grant is selected for transmission, the transmission performance of the data that must be transmitted via the Configured Grant that is not selected and cannot be transmitted will inevitably be degraded. Therefore, when the data to be transmitted via the Configured Grant is important, an alternative resource (840) for the resource transmitted via the Configured Grant that is not selected and cannot be transmitted can be provided to reduce the degradation of transmission performance.

[0040] To this end, the location of an alternative resource to be moved to can be specified based on the resource being used (810). In the embodiment of FIG. 8, it is assumed that the first Configured Grant (810) has priority, and the second Configured Grant (820), which is no longer usable, uses an alternative resource. At this time, which Configured Grant will have priority can be determined in advance, and based on the priority of the logical channels that can use each Configured Grant, the Configured Grant that can be used by the logical channel with the higher priority may be prioritized. In some embodiments, the priority of the logical channel may be applied regardless of whether the logical channel actually has data to transmit. However, in some embodiments, when using an alternative resource, it may be determined by the Configured Grant index value—for example, the Configured Grant with the smaller index value has priority—which Configured Grant will be used as is, and which Configured Grant will be moved to an alternative resource for use. At this time, an alternative resource (840) for the resource (820) of the 2nd Configured Grant is set, which can be done by setting a time shift value (850) and a frequency shift value (860) from the location (810) of the existing resource. At this time, the unit of the time shift value (850) can be absolute time (symbol, slot, subframe, etc.). Also, the unit of the frequency shift value (860) can be Hertz (Hz), number of subcarriers, resource blocks, etc. Furthermore, the alternative resource may be the same Bandwidth Part (BWP) as the existing resource or a different BWP.To provide this information, the location of the resource can be indicated by including the BWP ID, Cell ID, SCell index, etc.

[0042] FIG. 9 illustrates a method for indicating alternative resources. When two or more Configured Grants overlap in the time axis or in both the time and frequency axes, as described in FIG. 3 and FIG. 6, alternative resources can be configured for resources that the terminal cannot use, as described in FIG. 6, 7, and 8. To this end, the base station (910) may send a message to the terminal (920) indicating alternative resources. (930) The message may include information on which resource an alternative resource will be provided for, or which of the overlapping Configured Grants an alternative will be used. In the case of a Configured Grant that requires the use of an alternative resource, the location of that alternative resource may be indicated. The location of the alternative resource may be indicated as a location in the time and frequency axes relative to a specific Configured Grant described in FIG. 7 and 8, or an absolute location within the transmission resource using the SFN (System Frame Number), slot number, symbol number, etc. In addition, it may include the MCS of the alternative resource, the logical channel ID for which the alternative resource can be used, and the physical layer priority of the alternative resource. Additionally, the NDI (New Data Indicator) can be set to a certain value that is either toggled or not toggled to indicate that the data is an alternative resource. This alternative resource indicator message can also be provided in the form of a DCI using a PDCCH (Physical Downlink Control Channel). A terminal that receives the alternative resource indicator message (930) can change the location of the unusable Configured Grant from the location of the existing resource (940) to the location of the alternative resource (950) and perform transmission. (960)

[0044] FIG. 10 illustrates an embodiment in which a base station configures simultaneous transmission. In the case of a terminal, as described in FIG. 3 and FIG. 6, if two or more Configured Grants overlap in the time axis or in both the time and frequency axes, two Configured Grants may be transmitted simultaneously. In this case, the number of RF chains actually available to the terminal may be greater than the number of RF chains actually configured. In this case, the terminal (1010) must inform the base station (1020) that the terminal is capable of simultaneous transmission regarding the overlapping physical resources. This message may be included in a UE Capability message (1030) and transmitted. Based on this, the base station can identify a scenario in which transmission is possible for the terminal. For example, if the terminal is capable of transmitting two physical resources simultaneously, the base station may instruct the terminal to transmit by overlapping the Configured Grants. This instruction may be included in an RRC configuration message (1040). At this time, the base station may also configure a specific cell or a specific BWP to apply to the simultaneous transmission of the resources of the overlapping Configured Grant. Based on this, the terminal can decide whether to apply simultaneous transmission to the overlapping Configured Grant resources, transmit using the alternative resources described in FIGS. 6, 7, 8, and 9, or use only one of the overlapping resources.

[0046] In other embodiments, the base station may set conditions for simultaneous transmission. For example, if there is data to be sent by a logical channel higher than a certain priority, simultaneous transmission can be performed even if the Configured Grant resources overlap. For example, simultaneous transmission can be allowed for a logical channel higher than priority 4 regardless of whether the Configured Grant resources overlap. In this case, if the priority of the logical channel that must use the first Configured Grant is 2 and the priority of the logical channel that must use the second Configured Grant is 1, since both are higher than priority 4, data transmission in the corresponding Configured Grant can be performed even if the two Configured Grants overlap.

[0048] FIG. 11 is a drawing illustrating the structure of a terminal according to one embodiment of the present invention.

[0049] Referring to FIG. 11, the terminal may include a transceiver (1110), a control unit (1120), and a storage unit (1130). In the present invention, the control unit may be defined as a circuit or an application-specific integrated circuit or at least one processor.

[0050] The transceiver (1110) can transmit and receive signals with other network entities. The transceiver (1110) can, for example, receive system information from a base station and receive a synchronization signal or a reference signal.

[0051] The control unit (1120) can control the overall operation of the terminal according to the embodiment proposed in the present invention. For example, the control unit (1120) can control the signal flow between each block to perform operations according to the flowchart described above.

[0052] The storage unit (1130) can store at least one of the information transmitted and received through the transmission and reception unit (1110) and the information generated through the control unit (1120).

[0054] FIG. 12 is a drawing illustrating the structure of a base station according to one embodiment of the present invention.

[0055] Referring to FIG. 12, the base station may include a transceiver (1210), a control unit (1220), and a storage unit (1230). In the present invention, the control unit (1220) may be defined as a circuit or an application-specific integrated circuit or at least one processor.

[0056] The transmitting and receiving unit (1210) can transmit and receive signals with other network entities. The transmitting and receiving unit (1210) can, for example, transmit system information to a terminal and transmit a synchronization signal or a reference signal.

[0057] The control unit (1220) can control the overall operation of the base station according to the embodiment proposed in the present invention. For example, the control unit (1220) can control the signal flow between each block to perform operations according to the flowchart described above.

[0058] The storage unit (1230) can store at least one of the information transmitted and received through the transmission and reception unit (1210) and the information generated through the control unit (1220).

[0059] Meanwhile, FIG. 13 illustrates the detailed operation process for transmitting alternative resources when Configured Grants overlap as proposed in the present invention. As previously described, when two or more Configured Grant resources overlap, the terminal may be instructed to transmit to an alternative resource for the wireless resource with the lower priority. Additionally, the terminal may be instructed to transmit to an alternative resource when a Configured Grant resource overlaps with a Dynamic Grant resource, or when two or more Dynamic Grant resources overlap. Furthermore, when a Configured Grant or Dynamic Grant resource overlaps with control information such as a Scheduling Request, and the Configured Grant or Dynamic Grant has a lower priority, the terminal may also be instructed to transmit to an alternative resource. According to an embodiment, such alternative resources may be transmitted in advance via an RRC setting or reset message, or transmitted in the form of DCI using PDCCH.

[0061] In some embodiments, such alternative resources may be retransmission resources of the same HARQ process for the Configured Grant or Dynamic Grant with the corresponding lower priority. If the Configured Grant is not a Type 2 Configured Grant that is enabled or disabled, the resources allocated by CS-RNTI (Configured Scheduling - RNTI) may be alternative resources using such retransmission resources. The terminal may assume that due to a conflict of wireless resources, a Configured Grant has a lower priority than other resources (control information such as a Configured Grant, Dynamic Grant, or scheduling request). (1310) At this time, the terminal may check whether the MAC PDU to be transmitted to the Configured Grant with the lower priority has already been generated or has already been delivered to the lower layer, the physical layer. If the MAC PDU to be transmitted to the Configured Grant with the lower priority has already been generated (1320), the terminal may transmit or retransmit the MAC PDU already generated from the alternative resources to the Configured Grant with the lower priority. (1330) Here, the MAC PDU that has already been created may refer to the MAC PDU stored in the HARQ buffer corresponding to that HARQ process. On the other hand, if the MAC PDU that was to be sent to a Configured Grant with a lower priority has not already been created (1320), the terminal does not need to create that MAC PDU. However, the HARQ buffer of that HARQ process may contain a MAC PDU that was previously sent, and since this MAC PDU is not the MAC PDU that the terminal intends to send at this time, the remaining MAC PDU must be removed.Therefore, the terminal can empty the HARQ buffer of the same HARQ process without generating a MAC PDU. (1340) Through this, the terminal can determine that the HARQ buffer is empty at the time of transmission to an alternative resource and generate a new MAC PDU to transmit. Then the terminal can transmit the newly generated MAC PDU from that alternative resource. (1350).

[0063] FIG. 14 illustrates the detailed operation process for transmitting to an alternative resource when Configured Grants overlap, as proposed in the present invention. As previously described, when two or more Configured Grant resources overlap, the terminal may be instructed to transmit to an alternative resource for the wireless resource with the lower priority. Additionally, the terminal may be instructed to transmit to an alternative resource when a Configured Grant resource overlaps with a Dynamic Grant resource, or when two or more Dynamic Grant resources overlap. Furthermore, when a Configured Grant or Dynamic Grant resource overlaps with control information such as a Scheduling Request, and the Configured Grant or Dynamic Grant has a lower priority, the terminal may also be instructed to transmit to an alternative resource. Depending on the embodiment, such alternative resources may be delivered in advance via an RRC setting or reset message, or may be notified in the form of DCI using PDCCH.

[0065] In some embodiments, such alternative resources may be retransmission resources of the same HARQ process for the corresponding lower priority Configured Grant or Dynamic Grant. A terminal may assume that due to a conflict in wireless resources, a Dynamic Grant has a lower priority than other resources (control information such as a Configured Grant, a Dynamic Grant, or a scheduling request). (1410) At this time, the terminal may check whether the MAC PDU intended to be transmitted to the lower priority Dynamic Grant has already been generated or has already been delivered to the lower layer, the physical layer. If the MAC PDU intended to be transmitted to the lower priority Dynamic Grant has already been generated (1420), the terminal may transmit or retransmit the MAC PDU already generated from the alternative resource to the lower priority Dynamic Grant. (1430) Here, the MAC PDU already generated refers to the MAC PDU stored in the HARQ buffer corresponding to that HARQ process. On the other hand, if a MAC PDU intended for transmission to a low-priority Dynamic Grant has not already been generated (1420), the terminal does not need to generate that MAC PDU. However, there may be MAC PDUs that were previously transmitted remaining in the HARQ buffer of the HARQ process, and since these MAC PDUs are not the MAC PDUs the terminal intends to transmit at this time, the remaining MAC PDUs must be removed. Therefore, the terminal can empty the HARQ buffer of the same HARQ process without generating a MAC PDU (1440). This allows the terminal to verify that the HARQ buffer is empty at the time of transmission to the alternative resource and to generate a new MAC PDU to transmit. Then, the newly generated MAC PDU can be transmitted from the alternative resource (1450).

[0067] Meanwhile, the embodiments of the present invention disclosed in this specification and drawings are merely specific examples provided to facilitate the explanation of the technical content of the present invention and to aid in understanding the invention, and are not intended to limit the scope of the invention. That is, it is obvious to those skilled in the art that other variations based on the technical concept of the present invention are possible. Furthermore, each of the above embodiments may be combined and operated as needed. For example, parts of the methods proposed in the present invention may be combined to operate a base station and a terminal.

Claims

Claim 1 A method of a terminal in a wireless communication system, comprising: a step of determining whether a first configured grant has priority based on a conflict of resources related to an uplink grant, wherein the uplink grant includes a first configured grant and a second configured grant; a step of determining whether, if the first configured grant is a deprioritized uplink grant, a media access control (MAC) protocol data unit (PDU) corresponding to data associated with the first configured grant has been generated; a step of flushing a buffer corresponding to a hybrid automatic repeat request (HARQ) process if the first configured grant is a deprioritized uplink grant and the MAC PDU has not been generated; and a step of obtaining configuration information for identifying alternative resources, wherein the configuration information includes time shift information and frequency shift information for the resources of the configured grant. A method comprising: identifying an alternative resource for the first configured grant based on the acquired configuration information when the first configured grant is a deprioritized uplink grant and the MAC PDU is generated; and transmitting the generated MAC PDU from the alternative resource for the first configured grant. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 A method according to claim 1, further comprising the step of checking whether a resource related to the first configured grant and a resource related to another uplink grant conflict; wherein the other uplink grant is at least one of a configured grant, a dynamic grant, or control information. Claim 6 In a terminal of a wireless communication system, a transmitting and receiving unit; and, based on a conflict of resources related to the uplink grant, determine whether the first configured grant has priority—the uplink grant includes the first configured grant and the second configured grant; if the first configured grant is a deprioritized uplink grant, determine whether a Media Access Control (MAC) Protocol Data Unit (PDU) corresponding to the data associated with the first configured grant has been generated; if the first configured grant is a deprioritized uplink grant and the MAC PDU has not been generated, control the buffer corresponding to the Hybrid Automatic Repeat Request (HARQ) process to be flushed, and obtain configuration information to identify alternative resources—the configuration information includes time shift information and frequency shift information for the resources of the configured grant; if the first configured grant is a deprioritized uplink grant and the MAC PDU has been generated, identify alternative resources for the first configured grant based on the obtained configuration information, and for the first configured grant A terminal comprising: a control unit that controls the transceiver to transmit the generated MAC PDU from the above alternative resource. Claim 7 delete Claim 8 delete Claim 9 delete Claim 10 A terminal according to claim 6, wherein the control unit checks whether a resource related to the first configured grant and a resource related to another uplink grant conflict, and wherein the other uplink grant is at least one of a configured grant, a dynamic grant, or control information.

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