Method and apparatus for executing a scheduling request

Abstract

Disclosed are a communication technology and a system for integrating a 5G communication system supporting a data transmission rate higher than that of a 4G system with IoT technology. The present disclosure can be applied to smart services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail, safety and security related services, etc.) based on 5G communication technology and IoT related technologies. Disclosed are a method and a terminal for executing the method, which is executed by a terminal in a wireless communication system and includes the following steps: triggering a buffer status report (BSR); triggering a scheduling request (SR) for the BSR; before sending the SR, sending a medium access control (MAC) protocol data unit (PDU) containing the BSR; and determining whether to cancel the triggered SR based on information about a logical channel corresponding to the SR and logical channel information associated with the MAC PDU.

Description

Technical Field

[0001] The present disclosure relates to operations of a terminal and a base station in a mobile communication system. In addition, the present disclosure relates to a method and apparatus for requesting scheduling of a service (eg, an ultra-reliable low-latency communication (URLLC) service) in a mobile communication system. Background Art

[0002] In order to meet the demand for wireless data services since the deployment of 4G communication systems, efforts have been made to develop improved 5G or quasi-5G (pre-5G) communication systems. Therefore, 5G or quasi-5G communication systems are also referred to as "super 4G networks" or "post-LTE systems". 5G communication systems are considered to be implemented in higher frequency (mmWave) bands (such as 60GHz bands) 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 massive antenna technology are discussed in 5G communication systems. In addition, in 5G communication systems, development of system network improvements is underway based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, collaborative communications, coordinated multi-point (CoMP) / receiver interference elimination, etc. In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) as advanced coded modulation (ACM) and filter bank multi-carrier (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 in which people generate and consume information, is evolving into the Internet of Things (IoT), in which distributed entities (such as objects) exchange and process information without human intervention. The Internet of Everything (IoE) has emerged as a combination of IoT technology and big data processing technology by connecting cloud servers. Since IoT implementation already requires technical elements such as "sensing technology", "wired / wireless communication and network infrastructure", "service interface technology" and "security technology", sensor networks, machine-to-machine (M2M) communication, machine type communication (MTC), etc. have been studied recently. Such an IoT environment can provide intelligent Internet technology services that create new value for human life by collecting and analyzing data generated between connected objects. IoT can be applied to multiple fields including smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart appliances, and advanced medical services through the integration and combination between existing information technology (IT) and various industrialized applications.

[0004] In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine type communications (MTC), and machine-to-machine (M2M) communications can be implemented through beamforming, MIMO, and array antennas. The application of cloud radio access networks (RANs) as the above-mentioned big data processing technology can also be regarded as an example of the fusion of 5G technology and IoT technology.

[0005] In addition, in the next generation communication system, improved communication methods and devices for URLLC communication are needed.

[0006] The above information is presented as background information only and is provided to assist in understanding the present disclosure. No determination has been made, and no statement is made, as to whether any of the above description is applicable as prior art related to the present disclosure. Summary of the invention

[0007] Technical issues

[0008] The technical problem to be solved by the embodiments of the present disclosure is to provide an improved communication method. In addition, another technical problem to be solved by the embodiments of the present disclosure is to provide a method and apparatus for requesting scheduling of URLLC services in a mobile communication system.

[0009] Technical Solution

[0010] An embodiment of the present disclosure for solving the above-mentioned problem can provide a method performed by a terminal in a communication system, the method comprising: triggering a buffer status report (BSR); triggering a scheduling request (SR) for the BSR; before sending the SR, sending a medium access control (MAC) protocol data unit (PDU) containing the BSR; and determining whether to cancel the triggered SR based on information about a logical channel corresponding to the SR and logical channel information associated with the MAC PDU.

[0011] In addition, an embodiment of the present disclosure may provide a terminal in a wireless communication system, the terminal comprising: a transceiver; and a controller, the controller being configured to control to trigger a buffer status report (BSR), trigger a scheduling request (SR) for the BSR, send a medium access control (MAC) protocol data unit (PDU) containing the BSR via the transceiver before sending the SR, and determine whether to cancel the triggered SR based on information about a logical channel corresponding to the SR and logical channel information associated with the MAC PDU.

[0012] In addition, an embodiment of the present disclosure may provide a method performed by a base station in a wireless communication system, the method comprising: sending scheduling request (SR) configuration information to a terminal; receiving a medium access control (MAC) protocol data unit (PDU) containing a buffer status report (BSR) from the terminal; and receiving the SR without cancelling the scheduling request (SR) for the BSR in the terminal, wherein cancellation of the SR triggered by the terminal is determined based on information about a logical channel corresponding to the SR and logical channel information associated with the MAC PDU.

[0013] In addition, an embodiment of the present disclosure may provide a base station in a wireless communication system, the base station comprising: a transceiver; and a controller, configured to control to send scheduling request (SR) configuration information to a terminal via the transceiver, receive a medium access control (MAC) protocol data unit (PDU) containing a buffer status report (BSR) from the terminal via the transceiver, and receive the SR via the transceiver when the scheduling request (SR) for the BSR is not canceled in the terminal, wherein the cancellation of the SR triggered by the terminal is determined based on information about a logical channel corresponding to the SR and logical channel information associated with the MAC PDU.

[0014] The technical subject matter pursued by the present disclosure may not be limited to the above-mentioned technical subject matter, and other technical subject matter not mentioned may be clearly understood by those skilled in the art to which the present disclosure belongs through the following description.

[0015] Beneficial technical effects

[0016] According to an embodiment of the present disclosure, an improved communication method may be provided. In addition, according to an embodiment of the present disclosure, a method and apparatus for requesting scheduling of a URLLC service in a mobile communication system may be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The resource allocation process of a UE and a base station in a wireless communication system according to an embodiment of the present disclosure is shown;

[0018] Figure 2 An example of logical channel configuration according to an embodiment of the present disclosure is shown;

[0019] Figure 3 An embodiment of a logical channel configuration in which a scheduling request (SR) transmission scheme is configured according to an embodiment of the present disclosure is shown;

[0020] Figure 4A scenario in which a SR conflicts with radio resources of a medium access control (MAC) protocol data unit (PDU) according to an embodiment of the present disclosure is shown;

[0021] Figure 5 An embodiment in which SR is not cancelled according to an embodiment of the present disclosure is shown;

[0022] Figure 6 An embodiment in which an SR configuration is configured according to an embodiment of the present disclosure is shown;

[0023] Figure 7 The process of SR cancellation operation according to the configuration according to an embodiment of the present disclosure is shown;

[0024] Figure 8 The process of SR cancellation operation according to an embodiment of the present disclosure is shown;

[0025] Fig. 9 The process of SR cancellation operation according to an embodiment of the present disclosure is shown;

[0026] Fig.10 The process of SR cancellation operation according to an embodiment of the present disclosure is shown;

[0027] Fig.11 A selective transmission scheme when the radio resources of the SR and MAC PDU conflict according to an embodiment of the present disclosure is shown;

[0028] Fig.12 A selective transmission scheme when the radio resources of the SR and MAC PDU conflict according to an embodiment of the present disclosure is shown;

[0029] Fig.13 shows the structure of a base station according to an embodiment of the present disclosure; and

[0030] Fig.14 The structure of a UE according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0031] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description of the present disclosure, when the detailed description of known functions or configurations contained herein may make the subject matter of the present disclosure unnecessarily unclear, it will be omitted. The terms to be described below are terms defined in consideration of the functions in the present disclosure, and may differ depending on the user, user intent or custom. Therefore, the definition of terms should be based on the content throughout this specification.

[0032] By referring to the embodiments described in detail below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the methods for achieving these advantages and features will be clear. However, the present disclosure is not limited to the embodiments set forth below, but can be implemented in various different forms. The following embodiments are provided only to fully disclose the present disclosure and inform those skilled in the art of the scope of the present disclosure, and the present disclosure is limited only by the scope of the attached claims. Throughout the specification, the same or similar reference numerals represent the same or similar elements.

[0033] Figure 1 The resource allocation process of the UE and the base station in the wireless communication system according to the embodiment of the present disclosure is shown.

[0034] refer to Figure 1 , when new data has arrived (111), the user equipment (UE) 101 needs to request the gNB 102 that the corresponding data exists in order to perform uplink transmission to the gNB 102. This is called a buffer status report (BSR), and a buffer status report message may be sent, which includes information about how much data to be transmitted is retained in the data of each logical channel group. The conditions for triggering the BSR may include the following situations, among which: 1) the priority of the logical channel where the new data arrives is higher than the priority of the logical channel with existing data, 2) there is no data to be transmitted in all logical channels, and so on.

[0035] However, in the event that radio resources on which UE 101 can send a BSR do not exist, UE 101 can trigger a scheduling request (SR) message to send the scheduling request message to gNB 102 (112). The corresponding scheduling request message can be transmitted using resources pre-allocated to a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH). Each logical channel can trigger a BSR and therefore has an SR configuration that can be used when an SR is triggered, and the SR is transmitted by selecting an SR transmission resource indicated by the SR configuration. After receiving the SR, gNB 102 can allocate resources to UE 101 on which UE 101 can send data (113). UE 101 can send all remaining data, send data and the BSR together, or send only the BSR according to the size of the resources allocated from gNB 102 (114).

[0036] Figure 2 An example of logical channel configuration according to an embodiment of the present disclosure is shown.

[0037] Figure 2Two logical channels are shown configured, including logical channel (LCH) 1 220 and logical channel 2 230. The base station can instruct the UE to configure the logical channel to be used (210). Each logical channel can have a logical channel configuration value. Each logical channel can be distinguished by a logical channel ID. In addition, each logical channel has an SR configuration that can be used by the corresponding logical channel. The corresponding SR configuration can have a scheduling request ID 221 or 231, and each scheduling request ID can correspond to a scheduling request configuration, so that the scheduling request configuration to be used can be known. According to an embodiment, each logical channel can use zero or more SR configurations. Figure 2 , it is assumed that the scheduling request ID used by logical channel 1 is 1 and the scheduling request ID used by logical channel 2 is 2. In addition, in each logical channel, a priority 222 or 232 to be used for BSR triggering and SR triggering can be configured. In this case, a high priority may mean that the corresponding priority values ​​222 and 232 are lower. For example, a case where the priority value 222=3 can be interpreted as having a higher priority than a case where the priority value 232=5. The UE can determine whether to trigger an SR or a BSR by using the priority value. In addition, the priority value can be used to determine the transmission to be performed first when the triggered SR overlaps with another data or SR resource on the time axis, or on the time and frequency axis.

[0038] Figure 3 An embodiment of a logical channel configuration in which a scheduling request SR transmission scheme is configured according to an embodiment of the present disclosure is shown.

[0039] Figure 3 Two logical channels are shown configured, including logical channel (LCH) 1 320 and logical channel 2 330. The base station can instruct the UE to configure the logical channel to be used (310). Each logical channel can have a logical channel configuration value. Each logical channel can be distinguished by a logical channel ID. In addition, each logical channel has an SR configuration that can be used by the corresponding logical channel. The corresponding SR configuration can have a scheduling request ID 321 or 331, and each scheduling request ID can correspond to a scheduling request configuration, so that the scheduling request configuration to be used can be known. According to an embodiment, each logical channel can use zero or more SR configurations. Figure 3, it is assumed that the scheduling request ID used by logical channel 1 is 1 and the scheduling request ID used by logical channel 2 is 2. In addition, in each logical channel, a priority 322 or 332 to be used for BSR triggering and SR triggering can be configured. In this case, a high priority may mean that the corresponding priority values ​​322 and 332 are lower. For example, a case where the priority value 322=3 can be interpreted as having a higher priority than a case where the priority value 332=5. The UE can determine whether to trigger an SR or a BSR by using the priority value. In addition, the priority value can be used to determine the transmission to be performed first when the triggered SR overlaps with another data or SR resource on the time axis, or on the time and frequency axis.

[0040] Although the UE has triggered the BSR because there are no resources for transmitting the BSR after the BSR is triggered, the UE may send the BSR before sending the corresponding SR, and if the UE has reported all buffer statuses up to the above-mentioned time point to the BSR, the UE may cancel the transmission of the SR because it is no longer necessary to transmit the SR. However, since the BSR can be transmitted by being included in a usual medium access control (MAC) protocol data unit (PDU), delays due to retransmissions may occur. In the case of an SR triggered by a logical channel that processes URLLC data with a high priority, in the case where the SR is canceled due to BSR transmission, the transmission of the SR may be delayed due to the delay of the BSR. Therefore, in this case, the SR should not be canceled when the BSR is transmitted, and the SR may be canceled at the time point when the SR is triggered or when the transmission of the data of the corresponding logical channel generated at the time point when the previous BSR is triggered is completed. In another embodiment, the SR may not be canceled when the BSR is transmitted, and the SR may be canceled by determining the successful transmission of the MAC PDU including the BSR. Such successful transmission may be determined based on a New Data Indicator (NDI) of a Hybrid Automatic Repeat Request (HARQ) process in which the corresponding MAC PDU was transmitted being toggled or a HARQ ACK being received.

[0041] However, it may not be necessary to apply the procedure for performing the cancellation of an SR due to the above-mentioned BSR to all SRs. Figure 3 In the embodiment of , for a SR triggered by a logical channel (in which the corresponding field is configured as True by using the SRNotCancelByBSR fields 323 and 333), cancellation of the SR due to BSR transmission may not be performed. Figure 3In the embodiment of the present invention, since the SRNotCancelByBSR field 323 is configured as True in logical channel 1, the UE does not cancel the SR triggered by logical channel 1 even in the case of transmitting the BSR. However, since the SRNotCancelByBSR field 333 is configured as False in logical channel 2, in the case of transmitting the BSR, the UE can cancel the SR triggered by logical channel 2. The name of the SRNotCancelByBSR field may be configured with a different name, and the configuration value is not limited to True and False, and may be indicated by various information indicating whether SR transmission can be canceled based on the BSR.

[0042] Figure 4 A scenario in which the radio resources of the SR and the MAC PDU conflict according to an embodiment of the present disclosure is shown.

[0043] refer to Figure 4 , when data with a high priority arrives at the UE (or when data with a high priority is generated in the UE, or when data with a high priority is generated by the UE), in the absence of data with a priority equal to or higher than the priority of the logical channel through which the corresponding data is processed (410), a BSR is triggered by the corresponding logical channel (415, t1). In addition, in the absence of resources in which the BSR can be transmitted, the UE triggers the SR, and may prepare to send the SR to the resources configured by the SR in the logical channel that has triggered the SR. In this case, in the case where the SR resources (420, t2) that the UE intends to send overlap with the MAC PDU 425 that can transmit data, the UE needs to determine whether to send the SR or include the BSR in the MAC PDU and send it. The overlap of the SR and the MAC PDU may mean that the SR resources and the resources of the MAC PDU are located at the same time point only on the time axis, and in some cases, may mean that the resources overlap on both the time axis and the frequency axis. Regardless of the above two types of resource overlap, the embodiments of the present disclosure can always be applied. In this case, the UE can transmit the BSR by using Figure 2 and Figure 3 The priority described in the embodiment of the present invention determines whether to send an SR or a MAC PDU.

[0044] For each MAC PDU, the logical channel using the MAC PDU resources can be determined by the logical channel configuration. Specifically, available cells, subcarrier spacing (SCS), PUSCH duration, etc. can be configured for each logical channel. Based on the above configuration, it can be known through which the logical channels of the MAC PDU can be used. In addition, among the logical channels that can use the MAC PDU, the logical channels with data participate in the logical channel prioritization (LCP) process to include the data of each logical channel in the MAC PDU and transmit it. In this case, by comparing the priority of the logical channel that has triggered the SR and the highest priority among the priorities of the logical channels with data among the logical channels that can use the MAC PDU, the transmission with a higher priority can be selected. For example, when it is assumed that the priorities of the logical channels with data to be transmitted among the logical channels that can use the MAC PDU are 3 and 4 respectively, and the priority of the logical channel that has triggered the SR is 2, the SR can be transmitted.

[0045] However, the SR with priority may be restricted and used only when the resource used to transmit the SR ends before the end point (430, t3) on the time axis of the resource in which the MAC PDU is transmitted. Depending on the capability of the UE, the SR and the MAC PDU may be transmitted at the same time. In this case, even in the case where the BSR includes data of the logical channel that has triggered the SR, in the case where the highest priority of the logical channel included in the MAC PDU including the corresponding BSR is lower than the priority of the logical channel that has triggered the SR, the SR needs to be transmitted without being cancelled.

[0046] Figure 5 An embodiment in which SR is not cancelled according to an embodiment of the present disclosure is shown.

[0047] refer to Figure 5 , when data with a high priority arrives at the UE, in the absence of data with a priority higher than or equal to the priority of the logical channel through which the corresponding data is processed (510), a BSR is triggered by the corresponding logical channel (515, t1). In addition, in the absence of resources in which the BSR can be transmitted, the UE triggers an SR and can prepare to send the SR to the resources configured by the SR in the logical channel that has triggered the SR (515). Figure 5In the embodiment of 515, it is assumed that the resource in which the SR triggered in operation 515 is transmitted is the SR resource in operation 530. However, in the case where a MAC PDU capable of transmitting a BSR is allocated before the SR is transmitted (t2), the BSR may be included in the MAC PDU and transmitted (520). However, in the case where the priority of the logical channel that has triggered the SR is higher than the highest priority among the priorities of the logical channels that the MAC PDU can transmit, the transmission of the MAC PDU including the BSR cannot guarantee the fast data transmission of the logical channel that has triggered the SR. For example, the MAC PDU transmitted in operation 520 may not be successfully transmitted and thus may be instructed to retransmit (525), and therefore, the MAC PDU may be transmitted at a delayed time (t4) (540). Therefore, in this case, the BSR may not be transmitted in operation 520. In other words, a MAC PDU that can only be used by a logical channel having a priority lower than the priority of the logical channel by which the BSR has been triggered may not include a BSR triggered by a high priority. Since the BSR is not included, the SR may be transmitted in the configured SR resource (530). The MAC PDU that may be used by a logical channel having a higher priority than the logical channel by which the BSR has been triggered may include the BSR. In this case, the UE may cancel the SR triggered for the BSR.

[0048] In another embodiment, when the BSR is included in a MAC PDU used by a logical channel having a lower priority than the priority of the logical channel through which the BSR has been triggered in operation 520, the UE may not cancel the SR. That is, in a case where the priority of the logical channel through which the SR has been triggered is higher than the highest priority among the priorities of logical channels that can be transmitted through the MAC PDU, the UE may not cancel the SR even in a case where the BSR is included in the MAC PDU. Therefore, the SR may be transmitted in the resource in which the SR is configured regardless of whether the BSR is transmitted for the low-priority resource (530). In a case where the priority of the logical channel through which the SR has been triggered is lower than or equal to the highest priority among the priorities of logical channels that can be transmitted through the MAC PDU and the BSR has been transmitted to the corresponding MAC PDU, the UE may cancel the SR.

[0049] In another embodiment, when the BSR is included in a MAC PDU that cannot be used by the logical channel through which the SR has been triggered, the UE may not cancel the SR in operation 520. If the logical channel through which the SR has been triggered can use the corresponding MAC PDU, the UE may cancel the SR after sending the BSR.

[0050] Figure 6 An embodiment in which an SR configuration is configured according to an embodiment of the present disclosure is shown.

[0051] refer to Figure 6 , the UE may have multiple SR configurations 610 and 620, and each logical channel may use zero or more SR configurations. Figure 6 In the embodiment of FIG. 5 , it is assumed that there are two SR configurations, but more SR configurations may be provided. The SR configurations may have scheduling request IDs 611 and 621, which are identifiers for distinguishing each configuration. Each logical channel may be assigned a scheduling request ID of an SR configuration available in the logical channel configuration. Figure 6 In the embodiment of FIG. 1 , it is assumed that the scheduling request ID 611 of SR configuration 1 is configured as 0, and the scheduling request ID 621 of SR configuration 2 is configured as 1. In addition, the SR configuration may include SRNotCancelByBSR fields 612 and 622, which respectively correspond to configurations for preventing the cancellation of the SR due to the transmission of a specific BSR when the corresponding SR is triggered. In the case where SRNotCancelByBSR is configured as true, in Figure 5 In the case where a BSR is included in a specific MAC PDU described in the embodiment of FIG. 1 , the SR may not be cancelled. Figure 6 In the embodiment of FIG. 5 , it is assumed that in SR configuration 1, SRNotCancelByBSR 612 is configured as true, and in SR configuration 2, SRNotCancelByBSR 622 is configured as false. That is, an operation for preventing SR cancellation due to BSR transmission may be configured for each SR configuration.

[0052] Figure 7 The process of SR cancellation operation according to configuration according to an embodiment of the present disclosure is shown.

[0053] refer to Figure 7 , in the case where a certain logical channel has triggered an SR (710), the UE may wait for the transmission of the SR based on the SR configuration corresponding to the logical channel. Thereafter, a certain MAC PDU is allocated, and the UE generates a BSR, which contains the buffer status up to the last event that triggered the BSR before the MAC PDU was assembled (720). The UE may send a MAC PDU containing the BSR (720). In this case, the UE may cancel the triggered SR or may not cancel the triggered SR, depending on the type of the SR configuration. In the case where the UE identifies whether the configuration of the corresponding SR corresponds to an SR that is not canceled by a specific BSR, the operation may be changed according to the result (730). "SR that is not canceled by a specific BSR" may correspond to Figure 6In the case where the corresponding SR is an SR that is not canceled by the BSR, the UE may not cancel the corresponding SR even when the BSR has been reported (740). Otherwise, in the case where the SR is an SR that can be canceled by the BSR, the UE may cancel the corresponding SR (750).

[0054] Figure 8 The process of SR cancellation operation according to an embodiment of the present disclosure is shown.

[0055] refer to Figure 8 , in the case where a certain logical channel has triggered an SR, the UE may wait for the transmission of the SR based on the SR configuration corresponding to the logical channel (810). Thereafter, a certain MAC PDU is allocated, and the UE generates a BSR including the buffer status up to the last event that has triggered the BSR before the MAC PDU is assembled (820). The UE may send a MAC PDU including the BSR (820). In this case, the UE may cancel the triggered SR or may not cancel the triggered SR depending on the type of the MAC PDU including the BSR.

[0056] exist Figure 8 In an embodiment of the present invention, the UE may identify whether a MAC PDU used to transmit a BSR corresponds to a MAC PDU that can be used by a logical channel that has triggered the corresponding SR (830). For example, the UE may identify whether the logical channel that has triggered the SR corresponds to a logical channel that can use resources of the corresponding MAC PDU based on restrictions on resources that can be used by the logical channels (such as cells, subcarrier spacing (SCS), and PUSCH duration that can be used by each logical channel). In the case where the MAC PDU used to transmit the BSR corresponds to a MAC PDU that can be used by the logical channel that has triggered the SR, the UE may cancel the SR triggered by the logical channel that can use the MAC PDU resources (840). Otherwise, in the case where the MAC PDU used to transmit the BSR does not correspond to a MAC PDU that can be used by the logical channel that has triggered the SR, the UE does not cancel the SR triggered by the logical channel that cannot use the MAC PDU resources (850). Figure 8 The operations described in the above may only be applied to SRs triggered by specific logical channels, and such information may be configured when the logical channels are configured. Figure 8 The operations described in may only apply to specific SR configurations, and such information may be configured at SR configuration time.

[0057] Fig. 9 The process of SR cancellation operation according to an embodiment of the present disclosure is shown.

[0058] refer to Fig. 9 , in the case where the SR has been triggered by a certain logical channel (910), the UE may wait for the transmission of the SR based on the SR configuration corresponding to the logical channel. Thereafter, a certain MAC PDU is allocated, and the UE generates a BSR including the buffer status up to the last event that has triggered the BSR before the MAC PDU is assembled (920). The UE may send a MAC PDU including the BSR (920). In this case, the UE may cancel the triggered SR or may not cancel the triggered SR depending on the type of the MAC PDU including the BSR.

[0059] exist Fig. 9 In an embodiment of the present invention, the UE may identify whether the highest priority among the priorities of the logical channels that can use the MAC PDU for transmitting the BSR is higher than or equal to the priority of the logical channel that has triggered the SR (930). For example, the UE may identify whether each logical channel corresponds to a logical channel that can use the resources of the corresponding MAC PDU based on the restrictions on the resources that can be used by the logical channels (such as the cell that can be used by each logical channel, the subcarrier spacing (SCS), and the PUSCH duration). In the case where the highest priority among the priorities of the logical channels that can use the MAC PDU for transmitting the BSR is higher than or equal to the priority of the logical channel that has triggered the SR, the UE may cancel the SR triggered by the logical channel whose priority is lower than the highest priority among the priorities of the logical channels that can use the MAC PDU (940). Otherwise, in the case where the highest priority among the priorities of the logical channels that can use the MAC PDU for transmitting the BSR is lower than the priority of the logical channel that has triggered the SR, the UE does not cancel the SR triggered by the logical channel whose priority is higher than the highest priority among the priorities of the logical channels that can use the MAC PDU (950). Fig. 9 The operations described in may only be applied to SR triggered by a specific logical channel, and such information may be configured when the logical channel is configured. Fig. 9 The operation can also be applied to other embodiments. Fig. 9 The operations described in may only apply to a specific SR configuration, and such information may be configured at SR configuration time.

[0060] Fig.10 The process of SR cancellation operation according to an embodiment of the present disclosure is shown.

[0061] refer to Fig.10, in the case where the SR has been triggered by a certain logical channel (1010), the UE may wait for the transmission of the SR based on the SR configuration corresponding to the logical channel. Thereafter, a certain MAC PDU is allocated, and the UE generates a BSR including the buffer status up to the last event that has triggered the BSR before the MAC PDU is assembled (1020). The UE may send a MAC PDU including the BSR (1020). In this case, the UE may cancel the triggered SR or may not cancel the triggered SR depending on the type of the MAC PDU including the BSR.

[0062] exist Fig.10 In an embodiment of the present invention, the UE may identify whether the highest priority among the priorities of the logical channels including the data in the MAC PDU for transmitting the BSR is higher than or equal to the priority of the logical channel that has triggered the SR (1030). For example, the UE may identify whether each logical channel corresponds to a logical channel that can use the resources of the corresponding MAC PDU based on the restrictions of the resources that can be used by the logical channels (such as the cell, subcarrier spacing (SCS), and PUSCH duration that can be used by each logical channel). In the case where the highest priority among the priorities of the logical channels including the data in the MAC PDU for transmitting the BSR is higher than or equal to the priority of the logical channel that has triggered the SR, the UE may cancel the SR triggered by the logical channel having a priority lower than the highest priority among the priorities of the logical channels including the data in the MAC PDU (1040). Otherwise, in the case where the highest priority among the priorities of the logical channels including the data in the MAC PDU for transmitting the BSR is lower than the priority of the logical channel that has triggered the SR, the UE does not cancel the SR triggered by the logical channel having a priority lower than the highest priority among the priorities of the logical channels including the data in the MAC PDU (1050). Fig.10 The operations described in may only be applied to SR triggered by a specific logical channel, and such information may be configured when the logical channel is configured. Fig.10 The operation can also be applied to other embodiments. Fig.10 The operations described in may only apply to a specific SR configuration, and such information may be configured at SR configuration time.

[0063] Fig.11 A selective transmission scheme when the radio resources of the SR and MAC PDU conflict according to an embodiment of the present disclosure is shown.

[0064] refer to Fig.11, when a certain logical channel (1110, t1) has triggered an SR, the resources (1120, t2) on which the corresponding SR can be transmitted may overlap with a MAC PDU 1130 that can transmit data on a time axis resource, or on a time axis and frequency axis resource. The MAC PDU corresponds to a PUSCH resource as a physical channel, and corresponds to an uplink shared channel (UL-SCH) as a transmission channel. In this case, the UE needs to determine which of the SR resources and the MAC PDU that can transmit data will be sent. Fig.11 In the embodiment of the present invention, the UE can use Figure 2 and Figure 3 The priority described in the embodiment determines whether to send the SR or the MAC PDU.

[0065] For each MAC PDU, the logical channel using the MAC PDU resources may be determined by the logical channel configuration. Specifically, available cells, subcarrier spacing (SCS), PUSCH duration, etc. may be configured for each logical channel. Based on the above configuration, the logical channels through which the MAC PDU may be used may be known. In addition, among the logical channels that may use the MAC PDU, the logical channels with data participate in the logical channel prioritization (LCP) process, and the UE may include the data of each logical channel in the MAC PDU and transmit it. In this case, the UE may compare the priority of the logical channel that has triggered the SR with the highest priority among the priorities of the logical channels that may use the MAC PDU, so as to select a transmission with a higher priority. In the case where the priority of the logical channel that has triggered the SR is higher than the highest priority among the priorities of the logical channels that may use the MAC PDU, the UE may transmit the SR. In the case where the priority of the logical channel that has triggered the SR is lower than the highest priority among the priorities of the logical channels that may use the MAC PDU, the UE may transmit the MAC PDU. In the case where the priorities are the same, the UE may 1) prioritize the MAC PDU, 2) prioritize the SR, or 3) perform random selection.

[0066] exist Fig.11 In the embodiment of , the priority of the logical channel for which the SR has been triggered is 3, and the priority of the logical channel with the highest priority among the logical channels that can use the MAC PDU is 2. Fig.11 In an embodiment of the present invention, the UE performs the comparison by using the highest priority, regardless of whether there is data to be transmitted by the logical channel or whether data is contained in the MAC PDU. Therefore, since the MAC PDU has a high priority of 2, the MAC PDU (1140) can be sent.

[0067] Fig.12 A selective transmission scheme when the radio resources of the SR and MAC PDU conflict according to an embodiment of the present disclosure is shown.

[0068] refer to Fig.12 , when a certain logical channel (1210, t1) has triggered an SR, the resources (1220, t2) on which the corresponding SR can be transmitted can overlap with the MAC PDU1230 that can transmit data on the time axis resources or on the time axis and frequency axis resources. The MAC PDU corresponds to the PUSCH resource as a physical channel and corresponds to the uplink shared channel (UL-SCH) as a transmission channel. In this case, the UE needs to determine which of the SR resources and the MAC PDU that can transmit data will be sent. Fig.12 In the embodiment of the present invention, the UE can use Figure 2 and Figure 3 The priority described in the embodiment determines whether to send an SR or a MAC PDU.

[0069] For each MAC PDU, the logical channel using the MAC PDU resources can be determined by the logical channel configuration. Specifically, available cells, subcarrier spacing (SCS), PUSCH duration, etc. can be configured for each logical channel. Based on the above configuration, the logical channels through which the MAC PDU can be used can be known. In addition, among the logical channels that can use the MAC PDU, the logical channels with data participate in the logical channel prioritization (LCP) process, and the UE can include the data of each logical channel in the MAC PDU and send it. In this case, the UE can compare the priority of the logical channel that has triggered the SR and the highest priority among the priorities of the logical channels with data to be sent among the logical channels that can use the MAC PDU, so as to select the transmission with a higher priority. In the case where the priority of the logical channel that has triggered the SR is higher than the highest priority among the priorities of the logical channels with data to be sent among the logical channels that can use the MAC PDU, the UE can send the SR. In the case where the priority of the logical channel that has triggered the SR is lower than the highest priority among the priorities of the logical channels with data to be sent among the logical channels that can use the MAC PDU, the UE can send the MAC PDU. In case of the same priority, the UE may 1) prioritize the MAC PDU, 2) prioritize the SR, or 3) perform random selection.

[0070] exist Fig.12In the embodiment of , the priority of the logical channel that has triggered the SR is 3, and the priority of the logical channel that has the highest priority and has data to be sent among the logical channels that can use the MAC PDU is 5. Therefore, since the priority (3) of the logical channel that has triggered the SR is higher than the priority (5) of the MAC PDU, the SR can be sent (1240). Fig.12 In an embodiment of the present invention, the priority of the logical channel having data to be sent among the logical channels having data to be sent to the MAC PDU is considered. However, in another embodiment, the highest priority among the priorities of the logical channels that have actually sent data to the MAC PDU may be compared with the priority of the logical channel that has triggered the SR.

[0071] Fig.13 The structure of a base station according to an embodiment of the present disclosure is shown.

[0072] refer to Fig.13 , the base station may include a transceiver 1310, a base station controller 1320 and a memory 1330. In an embodiment of the present disclosure, the base station controller 1320 may be defined as a controller, a circuit or an application specific integrated circuit, or at least one processor.

[0073] The transceiver 1310 may send signals to other network entities or receive signals from other network entities. For example, the transceiver 1310 may send system information to the UE and may send a synchronization signal or a reference signal.

[0074] The base station controller 1320 may control the overall operation of the base station according to the embodiments proposed in the present disclosure. For example, the base station controller 1320 may control the signal flow between blocks so as to perform the operations according to the above flowchart.

[0075] The memory 1330 may store at least one of information transmitted or received via the transceiver 1310 and information generated via the base station controller 1320 .

[0076] Fig.14 The structure of a UE according to an embodiment of the present disclosure is shown.

[0077] refer to Fig.14 , the UE may include a transceiver 1410, a UE controller 1420, and a memory 1430. In an embodiment of the present disclosure, the UE controller 1420 may be defined as a controller, a circuit or an application specific integrated circuit, or at least one processor.

[0078] The transceiver 1410 may send signals to other network entities or receive signals from other network entities. For example, the transceiver 1410 may receive system information from a base station and may receive a synchronization signal or a reference signal.

[0079] The UE controller 1420 may control the overall operation of the UE according to the embodiments proposed in the present disclosure. For example, the UE controller 1420 may control the signal flow between blocks so as to perform the operations according to the above flowchart.

[0080] The memory 1430 may store at least one of information transmitted or received via the transceiver 1410 and information generated via the base station controller 1420 .

[0081] In addition, the embodiments described and shown in the specification and the drawings have been proposed to facilitate the explanation of the technical content of the present disclosure and to help understand the present disclosure, and are not intended to limit the scope of the present disclosure. Therefore, the scope of the present disclosure should be interpreted as including all changes and modifications based on the technical concept of the present disclosure in addition to the embodiments disclosed herein.

Claims

1. A method performed by a terminal in a communication system, the method comprising: Triggering a buffer status report BSR; Triggering a scheduling request SR for the BSR; Before sending the SR, sending a medium access control MAC protocol data unit PDU including the BSR; as well as determining whether to cancel the triggered SR based on information about the priority of the logical channel corresponding to the SR and information about the priority of the logical channel associated with the MAC PDU, Wherein, when the highest priority among the priorities of the logical channels associated with the MAC PDU is higher than or equal to the priority of the logical channel that has triggered the SR, the triggered SR is canceled.

2. The method according to claim 1, wherein: The logical channel associated with the MAC PDU corresponds to a logical channel that can use the MAC PDU.

3. The method according to claim 1, wherein: In case the MAC PDU is a MAC PDU that can be used by the logical channel that has triggered the SR, the triggered SR is canceled.

4. The method according to claim 1, wherein: The SR configuration information corresponding to the SR includes identification information indicating whether the SR can be canceled in association with the transmission of the BSR, and Whether to cancel the triggered SR is determined based on the identification information.

5. A terminal in a wireless communication system, the terminal comprising: Transceiver; and a controller configured to control to trigger a buffer status report BSR, trigger a scheduling request SR for the BSR, send a medium access control MAC protocol data unit PDU containing the BSR via the transceiver before sending the SR, and determine whether to cancel the triggered SR based on information about the priority of a logical channel corresponding to the SR and information about the priority of a logical channel associated with the MAC PDU, Wherein, when the highest priority among the priorities of the logical channels associated with the MAC PDU is higher than or equal to the priority of the logical channel that has triggered the SR, the triggered SR is canceled. The terminal according to claim 5, wherein: The logical channel associated with the MAC PDU corresponds to a logical channel that can use the MAC PDU.

7. The terminal according to claim 5, wherein: In case the MAC PDU is a MAC PDU that can be used by the logical channel that has triggered the SR, the triggered SR is canceled.

8. The terminal according to claim 5, wherein: The SR configuration information corresponding to the SR includes identification information indicating whether the SR can be canceled in association with the transmission of the BSR, and Whether to cancel the triggered SR is determined based on the identification information.

9. A method performed by a base station in a wireless communication system, the method comprising: Sending scheduling request SR configuration information to the terminal; receiving a medium access control MAC protocol data unit PDU including a buffer status report BSR from the terminal; as well as receiving the scheduling request SR for the BSR without cancelling the scheduling request SR in the terminal, wherein the cancellation of the SR triggered by the terminal is determined based on information about the priority of the logical channel corresponding to the SR and information about the priority of the logical channel associated with the MAC PDU, Wherein, when the highest priority among the priorities of the logical channels associated with the MAC PDU is higher than or equal to the priority of the logical channel that has triggered the SR, the triggered SR is canceled.

10. The method according to claim 9, wherein: The logical channel associated with the MAC PDU corresponds to a logical channel that can use the MAC PDU.

11. The method according to claim 9, wherein: In case the MAC PDU is a MAC PDU that can be used by the logical channel that has triggered the SR, the SR triggered by the terminal is canceled.

12. The method according to claim 9, wherein: The SR configuration information includes identification information indicating whether the SR can be canceled in association with the transmission of the BSR, and Whether to cancel the triggered SR is determined based on the identification information.

13. A base station in a wireless communication system, the base station comprising: Transceiver; and a controller configured to control to send scheduling request SR configuration information to the terminal via the transceiver, receive a medium access control MAC protocol data unit PDU including a buffer status report BSR from the terminal via the transceiver, and receive the SR via the transceiver without cancelling the scheduling request SR for the BSR in the terminal, wherein the cancellation of the SR triggered by the terminal is determined based on information about the priority of the logical channel corresponding to the SR and information about the priority of the logical channel associated with the MAC PDU, Wherein, when the highest priority among the priorities of the logical channels associated with the MAC PDU is higher than or equal to the priority of the logical channel that has triggered the SR, the triggered SR is canceled.

14. The base station according to claim 13, wherein: The logical channel associated with the MAC PDU corresponds to a logical channel that can use the MAC PDU.

15. The base station according to claim 13, wherein, in a case where the MAC PDU is a MAC PDU that can be used by the logical channel that has triggered the SR, the SR triggered by the terminal is cancelled, in, The SR configuration information includes identification information indicating whether the SR can be canceled in association with the transmission of the BSR, and Whether to cancel the triggered SR is determined based on the identification information.

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