Method and apparatus for transmitting and receiving data in wireless communication system

Abstract

A method of transmitting uplink data performed by a user equipment (UE) is provided. The method comprises: receiving configuration information for an uplink resource from a base station; determining a hybrid automatic repeat request (HARQ) process based on the configuration information; when uplink data corresponding to the HARQ process is sent, a configured permission timer CGT and a configured permission retransmission timer CGRT are started; when the uplink data corresponding to the HARQ process is retransmitted, the CGRT is restarted; receiving downlink feedback information (DFI) from the base station; the CGT and the CGRT are stopped based on a DFI indicating whether the base station receives uplink data.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus for transmitting and receiving data in a wireless communication system. Background Art

[0002] In order to meet the growing demand for wireless data services after the commercialization of the fourth generation (4G) communication system, efforts have been made to develop the fifth generation (5G) or pre-5G communication system. For this reason, the 5G or pre-5G communication system is called a "super 4G network" communication system or a "post-long term evolution (post-LTE)" system. In order to achieve high data rates, it is being considered to implement a 5G communication system in an ultra-high frequency or millimeter wave (mmwave) band (e.g., a 60GHz band). In order to reduce the path loss of radio waves and increase the transmission distance of radio waves in the ultra-high frequency band for 5G communication systems, various technologies such as beamforming, massive multiple input and multiple output (massive MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antennas are being studied. In order to improve the system network for 5G communication systems, various technologies such as evolved small cells, advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, collaborative communications, coordinated multipoint (CoMP), and interference elimination have also been developed. In addition, for 5G communication systems, advanced coding modulation (ACM) technologies such as hybrid frequency shift keying (FSK) and orthogonal amplitude modulation (QAM) (FQAM) and sliding window superposition coding (SWSC) have been developed, as well as advanced access technologies such as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse coded multiple access (SCMA).

[0003] The Internet has also evolved from a human-based connection network where humans create and consume information to the Internet of Things (IoT) in which distributed elements such as objects exchange information with each other to process information. At this point, the Internet of Everything (IoE) technology has emerged, in which IoT technology is combined with technology for processing big data, such as through connection with a cloud server. In order to realize IoT, various technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology and security technology are required, and technologies related to sensor networks for connecting objects, machine-to-machine (M2M) communication and machine type communication (MTC) have been studied in recent years. In the IoT environment, smart Internet technology (IT) services can be provided to collect and analyze data obtained from connected objects to create new value in human life. Since existing information technology (IT) and various industries are integrated and combined with each other, IT can be applied to various fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, health care, smart home appliances and advanced medical services.

[0004] Various attempts are being made to apply 5G communication systems to IoT networks. For example, technologies related to sensor networks, M2M communications, and MTC are being implemented by using 5G communication technologies including beamforming, MIMO, and array antennas. The application of cloud RAN as the above-mentioned big data processing technology is an example of the fusion of 5G communication technology and IoT technology.

[0005] Since various services may be provided according to the foregoing and the development of wireless communication systems, a method for smoothly providing such services is required.

[0006] The above information is presented as background information only to assist in understanding the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with respect to the present disclosure. Summary of the invention

[0007] [Technical solution]

[0008] An aspect of the present disclosure is to address at least the above problems and / or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the present disclosure is to provide an apparatus and method capable of effectively providing a service in a wireless communication system.

[0009] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments.

[0010] According to aspects of the present disclosure, a method for sending uplink data performed by a user equipment (UE) is provided. The method includes: receiving configuration information of uplink resources from a base station; determining a hybrid automatic repeat request HARQ process based on the configuration information; when sending uplink data corresponding to the HARQ process, starting a configured grant timer CGT and a configured grant retransmission timer CGRT; when retransmitting uplink data corresponding to the HARQ process, restarting CGRT; receiving downlink feedback information (DFI) from the base station; and stopping CGT and CGRT based on the DFI indicating whether the base station has received uplink data.

[0011] According to aspects of the present disclosure, when the DFI indicates that the base station receives uplink data, the CGT stops.

[0012] According to aspects of the present disclosure, when the CGT expires, the CGRT stops.

[0013] According to aspects of the present disclosure, the method further includes receiving a dynamic license from a base station, and initiating the CGT and the CGRT includes initiating the CGT based on the dynamic license.

[0014] According to aspects of the present disclosure, a user equipment (UE) for sending uplink data is provided. The UE includes a transceiver and at least one processor, wherein the at least one processor is connected to the transceiver and configured to: receive configuration information of uplink resources from a base station; determine a hybrid automatic repeat request (HARQ) process based on the configuration information; when uplink data corresponding to the HARQ process is sent, control to start a configured grant timer CGT and a configured grant retransmission timer CGRT; when uplink data corresponding to the HARQ process is retransmitted, control to restart CGRT; receive downlink feedback information (DFI) from the base station; and control to stop CGT and CGRT based on the DFI indicating whether the base station has received uplink data.

[0015] According to aspects of the present disclosure, at least one processor is further configured to: receive a dynamic grant from a base station; and initiate CGT based on the dynamic grant control.

[0016] According to aspects of the present disclosure, a method for receiving uplink data performed by a base station is provided. The method includes: sending configuration information of uplink resources to a user equipment UE; receiving uplink data corresponding to a hybrid automatic repeat request HARQ process from the UE, wherein the HARQ process is determined based on the configuration information; and sending downlink feedback information DFI to the UE, wherein based on the DFI, a configured grant timer CGT and a configured grant retransmission timer are stopped.

[0017] According to aspects of the present disclosure, the method further includes sending a dynamic grant to the UE, and wherein the CGT is initiated based on the dynamic grant.

[0018] According to aspects of the present disclosure, a base station for sending uplink data is provided. The base station includes a transceiver and at least one processor, wherein the at least one processor is connected to the transceiver and configured to: send configuration information of uplink resources to a user equipment (UE); receive uplink data corresponding to a hybrid automatic repeat request HARQ process from the UE, wherein the HARQ process is determined based on the configuration information; and send downlink feedback information (DFI) to the UE, wherein based on the DFI, a configured grant timer (CGT) and a configured grant retransmission are stopped.

[0019] According to aspects of the present disclosure, at least one processor is further configured to send a dynamic grant to the UE, and wherein the CGT starts based on the dynamic grant.

[0020] Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the accompanying drawings, discloses various embodiments of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description in conjunction with the accompanying drawings, in which:

[0022] Figure 1A is a schematic diagram showing the structure of a Long Term Evolution (LTE) system according to an embodiment of the present disclosure;

[0023] Figure 1B is a schematic diagram showing a radio protocol architecture in an LTE and New Radio (NR) system according to an embodiment of the present disclosure;

[0024] Figure 1C is a schematic diagram describing a listen-before-talk (LBT) type 1 according to an embodiment of the present disclosure;

[0025] Figure 1D is a schematic diagram describing LBT type 2 according to an embodiment of the present disclosure;

[0026] Figure 1E is a schematic diagram showing, in time, that a user equipment UE sends data on a configured uplink resource according to an embodiment of the present disclosure;

[0027] Figure 1F is another schematic diagram showing a UE sending data on a configured uplink resource in time according to an embodiment of the present disclosure;

[0028] Figure 1G is a flowchart showing an operation sequence of a UE when sending data on a configured uplink resource according to an embodiment of the present disclosure;

[0029] Figure 1H is a block diagram of a UE in a wireless communication system according to an embodiment of the present disclosure;

[0030] Figure 2A A radio bearer for performing packet copy transmission in a wireless communication system according to an embodiment of the present disclosure is shown;

[0031] Figure 2B A method of calculating a measurement value of a radio link control (RLC) entity according to an embodiment of the present disclosure is shown;

[0032] Figure 2C Another method of calculating a measurement value of an RLC entity according to an embodiment of the present disclosure is shown;

[0033] Figure 2D A method of calculating a measurement value of a radio bearer according to an embodiment of the present disclosure is shown;

[0034] Figure 2E Another method of calculating a measurement value of a radio bearer according to an embodiment of the present disclosure is shown;

[0035] Figure 2F is a flowchart illustrating a method of a UE performing autonomous packet copy transmission according to an embodiment of the present disclosure;

[0036] Figure 2G is another flow chart illustrating a method of a UE performing autonomous packet copy transmission according to an embodiment of the present disclosure;

[0037] Figure 2H A method for configuring autonomous packet copy transmission of a UE according to an embodiment of the present disclosure is shown;

[0038] Fig.2I The process of notifying a terminal of a packet replication activation state according to an embodiment of the present disclosure is shown;

[0039] Figure 2J A process of triggering a regular buffer status report (BSR) according to a UE's spontaneous packet duplication activation according to an embodiment of the present disclosure is shown;

[0040] Figure 2K is a flowchart illustrating a method of a UE performing autonomous packet copy transmission according to an embodiment of the present disclosure;

[0041] Figure 2L shows a split bearer operation when packet copy transmission is deactivated according to an embodiment of the present disclosure;

[0042] Figure 2M is a block diagram showing the structure of a base station according to an embodiment of the present disclosure; and

[0043] Figure 2N is a block diagram showing the structure of a UE according to an embodiment of the present disclosure.

[0044] Throughout the drawings, like reference numerals will be understood to refer to like parts, components and structures. DETAILED DESCRIPTION

[0045] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. The embodiments include various specific details to assist in understanding, but these are considered to be exemplary only. Therefore, it will be appreciated by those of ordinary skill in the art that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, for the sake of clarity and brevity, descriptions of well-known functions and structures may be omitted.

[0046] The terms and words used in the following description and claims are not limited to the bibliographic meanings, but are only used to enable a clear and consistent understanding of the present disclosure. Therefore, it should be clear to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustrative purposes only and not for limiting the disclosure defined by the attached claims and their equivalents.

[0047] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0048] Throughout the disclosure, the expression "at least one of a, b, or c" means only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c, or variations thereof.

[0049] Examples of the terminal may include a User Equipment (UE), a Mobile Station (MS), a cellular phone, a smart phone, a computer, a multimedia system capable of performing a communication function, and the like.

[0050] In the present disclosure, a controller may also be referred to as at least one processor.

[0051] Throughout the specification, a layer (or a layer arrangement) may also be referred to as an entity.

[0052] In the following description, for the convenience of description, terms used to identify access nodes, terms related to network entities, terms related to messages, terms related to interfaces between network entities, terms related to various identification information, etc. are shown. Therefore, the present disclosure is not limited to the terms described below, and other terms related to objects with equivalent technical meanings may be used.

[0053] Hereinafter, for ease of description, the present disclosure may use terms and names defined in Long Term Evolution (LTE) and the New Radio (NR) standard, which is the latest standard defined by the Third Generation Partnership Project (3GPP) group among current communication standards. However, the present disclosure is not limited to those terms and names, and may also be similarly applied to systems according to other standards. In particular, the present disclosure may be applied to 3GPP NR (5G mobile communication standard).

[0054] Figure 1A : is a schematic diagram showing the structure of an LTE system according to an embodiment of the present disclosure. The NR system may have a similar structure.

[0055] Reference Figure 1A , the wireless communication system may include multiple base stations 1a-05, 1a-10, 1a-15 and 1a-20, a mobility management entity (MME) 1a-25 and a serving gateway (S-GW) 1a-30. A user terminal (e.g., user equipment (UE) or terminal) 1a-35 can access an external network through the base stations 1a-05, 1a-10, 1a-15, 1a-20 and S-GW 1a-30.

[0056] Base stations 1a-05, 1a-10, 1a-15 and 1a-20 can provide radio access to terminals of access networks as access nodes of cellular networks. That is, in order to serve the user's business, based on status information such as the buffer status of the UE, the available transmission power status and / or the channel status, the base stations 1a-05, 1a-10, 1a-15 and 1a-20 can perform scheduling and support connections between the UE and the core network (CN). The MME 1a-25 can be an entity that performs various control functions and mobility management functions for the UE and can be connected to multiple base stations, and the S-GW 1a-30 can be an entity that provides data bearers. In addition, the MME 1a-25 and the S-GW 1a-30 can perform authentication, bearer management, etc. for the UE accessing the network, and can process packets received from the base stations 1a-05, 1a-10, 1a-15 and 1a-20 or packets to be sent to the base stations 1a-05, 1a-10, 1a-15 and 1a-20.

[0057] Figure 1B is a schematic diagram showing a radio protocol architecture in an LTE and NR system according to an embodiment of the present disclosure.

[0058] Reference Figure 1B, the radio protocols of the LTE system may include packet data convergence protocol (PDCP) 1b-05 and 1b-40, radio link control (RLC) 1b-10 and 1b-35, and medium access control (MAC) 1b-15 and 1b-30 in the UE and eNB, respectively. PDCP 1b-05 and 1b-40 may perform Internet Protocol (IP) header compression / decompression, etc., and RLC 1b-10 and 1b-35 may reconstruct PDCP packet data units (PDUs) in an appropriate size. MAC 1b-15 and 1b-30 may be connected to several RLC layers configured in one UE, and may perform operations of multiplexing RLC PDUs into MAC PDUs and demultiplexing RLC PDUs from MAC PDUs. The physical layer (PHY) 1b-20 and 1b-25 can channel encode and modulate the data of the higher layer, generate orthogonal frequency division multiplexing (OFDM) symbols, and send the generated symbols on the radio channel, or can demodulate and channel decode the OFDM symbols received on the radio channel, and send the result thereof to the higher layer. In addition, the physical layer can also use hybrid ARQ (HARQ) for additional error correction, and the receiving end can send information about whether the packet sent by the transmitting end is received in 1 bit. This can be called HARQ ACK / NACK information. In the case of LTE, downlink HARQ ACK / NACK information about uplink data transmission can be sent by using a physical hybrid ARQ indicator channel (PHICH) physical channel, and in the case of NR, it can be determined whether retransmission is required or new transmission should be performed by the scheduling information of the UE in the physical downlink control channel (PDCCH), which is a channel on which downlink / uplink resource allocation, etc. are sent. This may be because NR applies asynchronous HARQ.

[0059] The information included in the scheduling information of the PDCCH may include a HARQ process identifier (ID), a new data indicator (NDI), a redundancy version identifier (RVID), etc. The HARQ process ID (HARQ process identifier) ​​may be sent in parallel to support HARQ operations; for example, in the case of downlink data transmission, even when the ACK of the corresponding data has not been received after sending "HARQ process ID = 1", new data with HARQ process ID = 2 may be scheduled. In the case of NR, 16 HARQ process IDs may be supported in the uplink. In addition, a new data indicator (NDI) may be used to indicate whether the corresponding data is new data. For example, in the case of downlink transmission, for a specific HARQ process ID value, when the NDI value is 0, the base station may indicate a new transmission, and when the NDI value is 1, the base station may indicate a retransmission. Alternatively, the base station may indicate a new retransmission or transmission based on whether the value itself is equal to or different from the previous value. The redundancy version (RV) may be information indicating which packet is sent among a plurality of repeated packets generated for retransmitting the corresponding packet in the case of packet retransmission.

[0060] Uplink HARQ ACK / NACK information related to downlink data transmission may be transmitted by using a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH) physical channel.

[0061] The PUCCH may generally be transmitted in the uplink of a primary cell (PCell) described below; however, when supported by the UE, the PUCCH may additionally be transmitted to the UE in a secondary cell (SCell) described below, which may be referred to as a PUCCH SCell.

[0062] A radio resource control (RRC) layer (not shown) may exist above the PDCP layer of the UE and the base station, and the RRC layer may transmit / receive connection and measurement-related control messages for radio resource control.

[0063] The PHY layer may include one frequency / carrier or multiple frequencies / carriers, and the technology of configuring and using multiple frequencies at the same time may be referred to as carrier aggregation (CA). CA may mean a technology that can increase the amount of transmission through a secondary carrier by using one primary carrier and one secondary carrier or multiple secondary carriers instead of using only one carrier for communication between a terminal (or UE) and a base station (Evolved Universal Mobile Telephone System (UMTS) Terrestrial Radio Access Network (E-UTRAN), Node B, or Evolved Node B (eNB)). In LTE, a cell in a base station using a primary carrier may be referred to as a primary cell or primary cell (PCell), and a cell in a base station using a secondary carrier may be referred to as a subcell or secondary cell (SCell).

[0064] It is possible to consider the case where the above-mentioned 5G system operates in an unlicensed band. This system may be referred to as NR-U. Similarly, an unlicensed band may mean a band that anyone can freely use without requiring a separate license within the management license of the corresponding frequency. For example, an unlicensed band may include a 2.4 GHz or 5 GHz band, and wireless LAN, Bluetooth, etc. may perform communication by using the corresponding frequency.

[0065] In order to perform communication in an unlicensed band, data should be sent or received according to regulations established by each country. More specifically, according to the rule, before a communication device (e.g., a base station and a UE) transmits in an unlicensed band, the communication device should "listen" to determine whether the unlicensed band is occupied by another communication device, and then perform "transmission" when the unlicensed band is determined to be unoccupied. This method of listening and then sending when the unlicensed band is unoccupied can be referred to as listen before talk (LBT). Rules can be established to perform LBT in each country and unlicensed band, and communication devices should perform LBT according to the rules when communicating in an unlicensed band.

[0066] Generally, there can be two types of LBT, Type 1 and Type 2.

[0067] Figure 1C is a schematic diagram describing LBT Type 1 according to an embodiment of the present disclosure.

[0068] Reference Figure 1C , LBT Type 1 can be a method of randomly determining the time to listen to other peripheral devices for transmission before transmission, and then transmitting when the channel is not occupied for a random time. In this case, it can first listen for a fixed time T d , then, when the channel is unoccupied, it can determine whether the channel is unoccupied at a random time N.

[0069] In this case, it can be determined differently how to determine T according to the priority and importance of the business. d and N values, and there can be a total of four different levels. The class can be called a channel access priority class (CAPC).

[0070] In addition, according to CAPC, it can have T d =16+mp*9(μs) and has N=random(0, CW P )*9(μs) and the CW value can be obtained from CW min,p starts and increases by approximately two times whenever the transmission fails and can have CW max,p For example, when LBT is performed by using a CAPC of 3, in the case of initial transmission, T d may have a length of 16+3*9=43 μs and N may have a random value selected between 0 and 15, and for example, when 7 is selected as CW P , N can be 7*9=63 μs, and thus the communication device can send data when the channel is not occupied for 106 μs.

[0071] Table 1

[0072]

[0073] In the above example (when 7 is selected as the CW for N P ), when in the middle of determining whether the channel is unoccupied (for example, when CW P When it is determined that the channel has been occupied by another device (i.e., when the received signal strength indicator (RSSI) is greater than or equal to a certain threshold), the UE may wait until the occupation of the channel ends, and then wait again for T d , and then the transmission is performed by determining whether the channel is not occupied within the remaining time of 4. As shown in Table 1, the LBT method with low CAPC can be used to send high priority traffic.

[0074] When a communication device determines that a channel is not occupied and thus occupies the channel once, the maximum time that the communication device can occupy the channel may be referred to as T mcot,p That is, the maximum time that a UE can occupy a channel can be limited according to the CAPC value. For example, in the case where CAPC=1 has a high priority, the probability of occupying a channel may be high, while the time that the channel may be occupied may be relatively short. When CAPC is 3 or 4, a long value (i.e., 10ms) can be used only when there is no heterogeneous device such as a wireless LAN.

[0075] Figure 1Dis a schematic diagram describing LBT Type 2 according to an embodiment of the present disclosure.

[0076] Reference Figure 1D , LBT Type 2 can be a fixed-time method for listening to other peripherals for transmission before transmission, and transmitting immediately when the channel is not occupied within a fixed time. Figure 1D , when a communication device needs to send, it can (sensing) monitor the channel for a fixed time T short (=T f +T s ), and then immediately send data when it is determined that the channel is not occupied. This can be an LBT method, which can be used to send signals with very high priority. Therefore, random access preambles, PUCCH, etc. can be signals with high importance and can be transmitted by using Figure 1D The LBT method is used to send.

[0077] When the base station dynamically allocates resources for sending downlink data and sending downlink data, the base station can determine the LBT type and CAPC according to the type of data to be sent. In addition, when the base station dynamically allocates resources for sending uplink data and the UE sends data to the base station on the resource, the base station can determine the LBT type and CAPC to be used by the UE to send data, and indicate the LBT type and CAPC to the UE. That is, when the base station sends uplink resource allocation information to the UE on the PDCCH, the LBT type and CAPC can be indicated to send uplink data. In addition, when the base station determines that the UE does not need to perform LBT, it can indicate that LBT is not performed. For example, in a TDD system where the downlink and uplink frequencies are equal to each other, when the base station occupies the channel once and the switching time between the downlink and uplink is very short, the UE may not need to perform LBT by assuming that the base station continues to occupy the channel. For example, when the base station occupies the channel once by using CAPC=4, it can be assumed that the base station occupies the channel for 8ms or 10ms in the downlink and uplink, and the UE that sends data during the corresponding part may not need to perform LBT. In this case, when the base station schedules the uplink to the UE, it can separately indicate that LBT may not need to be performed. Alternatively, when the base station allocates uplink resources to the UE, when it is determined that the uplink of the UE will always be allocated in the Tmcot,p of the base station, it can indicate to the UE through a message of the RRC layer (e.g., RRCReconfiguration message) that LBT may not need to be performed, and both the LBT type and the CAPC can be omitted in the uplink resource allocation in the PDCCH sent to the UE.

[0078] Furthermore, a method of allocating periodic resources instead of dynamically allocating resources for uplink transmission every time may be used, and such periodic resources may be referred to as a configuration (uplink) grant.

[0079] Although not shown in the present disclosure, in a configured license used in a licensed band, each periodic resource can be mapped to a specific HARQ process ID, and only new data can be sent on the periodic resource, and when retransmission is required, the base station can individually and dynamically allocate resources to the UE to perform retransmission.

[0080] The base station may also perform the above operation in an unlicensed band, and when the periodic resource is mapped to a specific HARQ process ID and is restricted to only sending new data as in a licensed band, the corresponding packet may not be sent for a period of time when the UE fails to perform LBT to send data on the corresponding resource. In order to solve this problem, instead of mapping the periodic resource to a specific HARQ process ID and restricting it to only sending new data as in a licensed band, the HARQ process ID to be sent for each periodic resource and whether it is a new transmission or a retransmission may be separately indicated under the determination of the UE. When the UE sends data on the corresponding resource, this may allow the base station to determine which data has been received by sending information about the above-mentioned HARQ process ID, NDI, and RVID (hereinafter collectively referred to as UCI) together.

[0081] Figure 1E is a schematic diagram showing a UE sending data on configured uplink resources in time according to an embodiment of the present disclosure.

[0082] Reference Figure 1E , assuming that the UE is in an RRC connected state (RRC_CONNECTED) by accessing the base station. In addition, it is assumed that the UE is allocated an uplink resource 1e-01 configured to allow periodic uplink transmission from the base station. The periodic uplink resource may correspond to the configured license in the above-mentioned unlicensed band (ie, the UE determines the data to be sent and sends the data including the UCI information); however, the periodic uplink resource itself may not necessarily need to operate in the unlicensed band.

[0083] In 1e-00, when uplink data transmission is required, the UE may first perform LBT before sending data on the corresponding periodic resource 1e-01, and then send data in the uplink after LBT (1e-03) is successful. In this case, the UE may allow the base station to subsequently decode the corresponding data by notifying which HARQ process ID the corresponding transmission belongs to, whether the corresponding transmission is a new transmission (e.g., NDI=0), and which value the transmitted RV value is. In addition, when the UE succeeds in transmission, the UE may drive two types of timers.

[0084] The first timer may be referred to as a configured grant timer (CGT) (1e-15), and the first timer may ensure the execution of retransmission by preventing the UE from performing a new transmission on the corresponding HARQ process ID while the first timer is running. Expiration of the first timer may mean that the base station has successfully received the corresponding data and may perform a new transmission using the corresponding HARQ process ID.

[0085] The second timer may be referred to as a configured grant retransmission timer (CGRT) (1e-11) (1e-13), and the second timer may limit retransmission so that the base station may determine whether reception is performed while the second timer is running. Expiration of the second timer may mean that the base station has not received the corresponding data, and thus the corresponding data may be retransmitted.

[0086] Therefore, the UE can perform initial transmission (1e-03) and then drive the CGT and CGRT, and when the downlink feedback information (DFI) indicating that the data has been successfully received from the base station is not received before the CGRT expires, the UE can determine that the corresponding data has not been successfully sent, and then perform retransmission of the corresponding data, and thus can perform retransmission on the periodic uplink resources (1e-05) and drive the CGRT again (1e-13). Upon successfully receiving the corresponding data, the base station can send a DFI to the UE to notify the UE that the corresponding data has been successfully received (1e-21), and upon receiving the DFI, the UE can determine that the corresponding data has been successfully sent and stop driving the CGRT because the CGRT no longer needs to run (1e-23). ​​Thereafter, when the CGT expires (1e-25), the UE can also send new data by using the corresponding HARQ process ID.

[0087] Similarly, in 1e-50, when uplink data transmission is required, the UE may first perform LBT before sending data on the corresponding periodic resource 1e-51, and then send data in the uplink after LBT (1e-53). In this case, the UE may allow the base station to subsequently decode the corresponding data by notifying which HARQ process ID the corresponding transmission belongs to, whether the corresponding transmission is a new transmission (e.g., NDI=0), and which value the transmitted RV value is. In addition, as described above, when the transmission is successful, the UE may drive two types of timers, namely CGT (1e-65) and CGRT (1e-61).

[0088] Thereafter, when a DFI indicating that data has been successfully received from the base station is not received before the CGRT expires, the UE may determine that the corresponding data has not been successfully sent, and then perform retransmission of the corresponding data, and therefore, retransmission may be performed on the periodic uplink resources (1e-55) and the CGRT may be driven again (1e-63). Although the base station has not correctly received the corresponding data, the base station may no longer notify the UE of it, and may directly and dynamically allocate resources to perform retransmission. For this purpose, the base station may indicate retransmission to the UE on the corresponding HARQ process ID by using the PDCCH (1e-71). Upon successful reception, the UE may stop the CGRT (1e-73) managed for retransmission in the configured grant and restart the CGT (1e-75). Therefore, the UE may retransmit the corresponding data according to the uplink resource allocation information received by using the PDCCH (1e-81). In addition, the UE may also restart the CGT (1e-77) when the actual data has been sent and when the PDCCH has been received. Therefore, whenever dynamic resources are scheduled from the base station and whenever transmission is performed, the UE can restart the corresponding CGT and can give all control to the base station.

[0089] Figure 1F is another schematic diagram showing a UE sending data on a configured uplink resource in time according to an embodiment of the present disclosure.

[0090] Reference Figure 1F ,like Figure 1E As shown, it is assumed that the UE is in an RRC connected state (RRC_CONNECTED) by accessing the base station. In addition, it is assumed that the base station is allocated uplink resources configured to allow periodic uplink transmission. The periodic uplink resources may correspond to the configured license in the above-mentioned unlicensed band (i.e., the UE determines the data to be sent and sends the data including UCI information); however, the periodic uplink resources themselves may not necessarily need to operate in the unlicensed band.

[0091] Therefore, in 1f-00, when uplink data transmission is required, the UE can first perform LBT before sending data on the corresponding periodic resource 1f-01, and then send data in the uplink after the LBT (1f-03) is successful. In this case, the UE can allow the base station to subsequently decode the corresponding data by notifying which HARQ process ID the corresponding transmission belongs to, whether the corresponding transmission is a new transmission (for example, NDI=0), and which value the transmitted RV value is. In addition, when the transmission is successful, the UE can drive two types of timers, namely CGT (1f-15) and CGRT (1f-11).

[0092] Thereafter, when a DFI indicating that data has been successfully received from the base station is not received before the expiration of the CGRT, the UE can determine that the corresponding data has not been successfully sent, and then perform retransmission of the corresponding data, and thus can perform retransmission on the periodic uplink resources (1f-05) and drive the CGRT again (1f-13). Upon successfully receiving the corresponding data, the base station can send a DFI to the UE to notify the UE that the corresponding data has been successfully received (1f-21), and upon receiving the DFI, the UE can determine that the corresponding data has been successfully sent and stop driving the CGRT because the CGRT no longer needs to run (1f-23). ​​In addition, since the corresponding data has been successfully received, the UE can also terminate the CGT so that the corresponding HARQ process ID can be immediately used for new data transmission (1f-25). Therefore, the UE can immediately send new data by using the corresponding HARQ process ID.

[0093] In 1f-50, when uplink data transmission is required, the UE may first perform LBT before sending data on the corresponding periodic resource 1f-51, and then send data in the uplink after the LBT (1f-53) is successful. In this case, the UE may allow the base station to subsequently decode the corresponding data by notifying which HARQ process ID the corresponding transmission belongs to, whether the corresponding transmission is a new transmission (e.g., NDI=0), and which value the transmitted RV value is. In addition, when the transmission is successful, the UE may drive two types of timers, namely CGT (1f-75) and CGRT (1f-61).

[0094] Thereafter, when the DFI indicating that the data has been successfully received from the base station is not received before the CGRT expires, the UE may determine that the corresponding data has not been successfully sent, and then perform retransmission of the corresponding data, and therefore, may perform retransmission on the periodic uplink resources (1f-55)(1f-57) and drive the CGRT again (1f-63)(1f-65). Figure 1FAs shown, this can be repeated several times and can be repeated until the CGT expires (1f-71). As described above, since the CGT is (re)started when the LBT has succeeded, and thus the data is actually (re)sent, when the CGT expires, it can be determined that the base station has successfully received the data, and therefore, the already running CGRT can also be stopped (1f-67). Therefore, the UE can immediately send new data by using the corresponding HARQ process ID.

[0095] Figure 1G is a flowchart illustrating an operation sequence when a UE sends data on configured uplink resources according to an embodiment of the present disclosure.

[0096] Reference Figure 1G , assuming that the UE is in the RRC connected state (RRC_CONNECTED) by accessing the base station.

[0097] In operation 1g-03, the UE may receive a configured uplink resource (configured uplink grant) from the base station, the configured uplink resource being configured to allow periodic uplink transmission. The periodic uplink resource may correspond to the configured grant in the above-mentioned unlicensed band (i.e., the UE determines the data to be sent and sends the data including UCI information); however, the periodic uplink resource itself may not necessarily need to operate in the unlicensed band.

[0098] Therefore, whenever each periodic uplink resource arrives at operation 1g-05, the UE can determine how to send (RV) data through which HARQ process ID, and therefore, at operation 1g-07, the UE can attempt to send data on the corresponding resource. Figure 1G In operation 1g-09, it is assumed that the operation is performed in an unlicensed band, and therefore, the actual transmission can be determined according to the success or failure of the UL LBT. When a failure occurs in the UL LBT in operation 1g-09, the UE can attempt to send the corresponding data on the configured licensed resources of the next cycle. When the UL LBT is successfully entered in operation 1g-09, according to whether the corresponding transmission in operation 1g-11 is the initial transmission, when the corresponding transmission is the initial transmission, the UE can start CGT in operation 1g-13, otherwise (i.e., when the corresponding transmission is a retransmission), the UE can start or restart CGRT in operation 1g-15.

[0099] Thereafter, in operation 1g-17, the UE may receive a DFI from the base station, or may be dynamically scheduled for retransmission on the PDCCH.

[0100] When the DFI has been received in operation 1g-19 (i.e., when ACK information about the corresponding data is received), the UE can stop the already running CGRT in operation 1g-21, and also stop the CGT so as to send new data through the corresponding HARQ process ID in operation 1g-05.

[0101] When the UE performs retransmission by dynamically receiving resource allocation from the base station on the PDCCH, in operation 1g-23, the UE can send data by (re)starting the CGT and sending actual data. From this point on, the UE can pass all control of resource allocation to the base station, and therefore, when the CGT expires in operation 1g-35, the UE can determine in operation 1g-05 that the corresponding data has been successfully sent, and send new data through the corresponding HARQ process ID. In this case, since the CGRT is not running, it may not be necessary to stop the CGRT separately.

[0102] In operation 1g-31, when the UE fails to receive DFI from the base station in a state where retransmission is not dynamically scheduled on the PDCCH, or when the CGRT expires, the UE may consider that the base station has failed to receive the corresponding data, and thus may retransmit the corresponding data on periodic resources in operation 1g-33, and may therefore select the corresponding data to be sent on periodic resources in operation 1g-05.

[0103] When the CGT expires in operation 1g-35, it is determined that the corresponding data has been successfully sent, and when the CGRT is running, the CGRT can be stopped in operation 1g-37, and the UE can immediately send new data through the corresponding HARQ process ID in operation 1g-05.

[0104] Figure 1H is a block diagram of a UE in a wireless communication system according to an embodiment of the present disclosure.

[0105] Reference Figure 1H , the UE may include a radio frequency (RF) processor 1h-10, a baseband processor 1h-20, a memory 1h-30, and at least one processor or controller 1h-40.

[0106] The RF processor 1h-10 can perform functions for sending or receiving signals by using a wireless channel, such as frequency band conversion and amplification of signals. That is, the RF processor 1h-10 can up-convert the baseband signal provided from the baseband processor 1h-20 into an RF band signal and transmit it through an antenna, and can down-convert the RF band signal received through the antenna into a baseband signal. For example, the RF processor 1h-10 may include a transmitting filter, a receiving filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), and an analog-to-digital converter (ADC). Although in Figure 1H Only one antenna is shown in the figure, but the UE may include multiple antennas. Moreover, the RF processor 1h-10 may include multiple RF chains. In addition, the RF processor 1h-10 may perform beamforming. For beamforming, the RF processor 1h-10 may adjust the phase and amplitude of each signal transmitted or received through multiple antennas or antenna elements.

[0107] The baseband processor 1h-20 can perform conversion functions between baseband signals and bit streams according to the physical layer standard of the system. For example, during data transmission, the baseband processor 1h-20 can generate complex symbols by encoding and modulating the transmission bit stream. In addition, during data reception, the baseband processor 1h-20 can recover the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 1h-10. For example, according to the OFDM scheme, during data transmission, the baseband processor 1h-20 can generate complex symbols by encoding and modulating the transmission bit stream, mapping the complex symbols to subcarriers, and then configuring OFDM symbols through an inverse fast Fourier transform (IFFT) operation and a cyclic prefix (CP) insertion. In addition, during data reception, the baseband processor 1h-20 can divide the baseband signal provided from the RF processor 1h-10 into OFDM symbol units, recover the signal mapped to the subcarrier through a fast Fourier transform (FFT) operation, and then recover the received bit stream through demodulation and decoding.

[0108] As described above, the baseband processor 1h-20 and the RF processor 1h-10 can send and receive signals. Therefore, the baseband processor 1h-20 and the RF processor 1h-10 can be referred to as a transmitter, a receiver, a transceiver or a communicator. In addition, at least one of the baseband processor 1h-20 or the RF processor 1h-10 may include a plurality of communication modules that support a plurality of different wireless access technologies. In addition, at least one of the baseband processor 1h-20 or the RF processor 1h-10 may include different communication modules to process signals of different frequency bands. For example, different wireless access technologies may include wireless LANs (e.g., IEEE 802.11) and cellular networks (e.g., LTE). Moreover, different frequency bands may include ultra-high frequency (SHF) (e.g., 2.5 GHz or 5 GHz) bands and millimeter wave (e.g., 60 GHz) bands.

[0109] The memory 1h-30 may store data such as basic programs, applications, or configuration information for the operation of the UE. In particular, the memory 1h-30 may store information related to a wireless LAN node that performs wireless communication by using a wireless LAN access technology. In addition, the memory 1h-30 may provide the stored data at the request of the controller 1h-40.

[0110] The controller 1h-40 can control the entire operation of the UE. For example, the controller 1h-40 can send or receive signals through the baseband processor 1h-20 and the RF processor 1h-10. In addition, the controller 1h-40 can write data to the memory 1h-30 / read data from the memory 1h-30. For this purpose, the controller 1h-40 may include at least one processor. For example, the controller 1h-40 may include a communication processor (CP) for performing communication control and an application processor (AP) for controlling a higher layer such as an application. According to an embodiment of the present disclosure, the controller 1h-40 may include a multi-connection processor 1h-42 that executes a process for operating in a multi-connection mode. For example, the controller 1h-40 can control the UE to perform Figure 1E The process shown in the operation of the UE shown.

[0111] According to an embodiment of the present disclosure, the controller 1h-40 can control the transmission by driving the CGT and CGRT so as to send data in the uplink configured by the above method.

[0112] Figure 2A A radio bearer for performing packet copy transmission in a wireless communication system according to an embodiment of the present disclosure is shown.

[0113] Reference Figure 2A , a radio bearer (2a-10) in which packet copy transmission can be configured may include one packet data convergence protocol (PDCP) entity 2a-20 and two or more radio link control (RLC) entities 2a-30, 2a-40 and 2a-50. When packet copy transmission is activated, the radio bearer can implement copy transmission of the same packet by copying the packet in the PDCP entity 2a-20 and sending each of the copied packets to multiple RLC entities 2a-30, 2a-40 and 2a-50 used in the packet copy transmission. The RLC entities 2a-30, 2a-40 and 2a-50 can be sent to the media access control (MAC) layer to perform transmission by using logical channels 2a-60, 2a-70 and 2a-80, respectively. In this case, since the RLC entities 2a-30, 2a-40, and 2a-50 may have a one-to-one correspondence with the logical channels 2a-60, 2a-70, and 2a-80, reference to a specific logical channel may mean the RLC entity corresponding to the logical channel. The logical channels 2a-60, 2a-70, and 2a-80 may receive a list of available cells from the base station. Figure 2AIn the example, it is assumed that logical channel 1 (2a-60) can use cell 1 (2a-90) and cell 2 (2a-100), logical channel 2 (2a-70) can use cell 4 (2a-120), cell 5 (2a-130) and cell 6 (2a-140), and logical channel 3 (2a-80) can use cell 8 (2a-160). In this example, cell 3 (2a-110) and cell 7 (2a-150) exist but are not used.

[0114] The cell list available for each logical channel can be sent by including the cell list available for each logical channel in the logical channel configuration in the RRC configuration message sent from the base station to the UE. As described above, because the RLC entity and the logical channel can have a one-to-one correspondence with each other, the cell list available for the logical channel can correspond to the cell list available for the RLC entity. Figure 2A The cells described in the description may be cells configured in the same cell group, or in some cases, may be cells configured in two or more cell groups. In addition, among the RLC entities configured in the radio bearer, a primary RLC entity (2a-30, 2a-40 or 2a-50) and a secondary RLC entity may be included. In this case, the primary RLC may be used to send a PDCP control protocol data unit (PDU), or may be used to preferentially send packets when packet copy transmission is deactivated. In addition, the secondary RLC entity may be configured in the radio bearer. In this case, among the RLC entities configured in a cell group different from the primary RLC entity, the secondary RLC entity may be used for separate bearer operation when packet copy transmission is deactivated.

[0115] Figure 2B A method of calculating a measurement value of an RLC entity according to an embodiment of the present disclosure is shown.

[0116] Reference Figure 2B , the activation and deactivation of packet copy transmission can be configured by the base station. However, the activation and deactivation of packet copy transmission by the base station may take a long time until the base station recognizes the state change of the UE and issues an activation or deactivation command to the UE. In addition, when the UE does not accurately receive the packet copy activation or deactivation command, additional delay time may occur. In order to reduce this inefficiency, the UE may autonomously perform packet copy transmission according to a configured or pre-configured rule. The rule may be the result of measuring the cells that can be used by the radio bearer performing the packet copy transmission. Figure 2B A method for defining measurement values ​​for an RLC entity (or corresponding logical channel) performing autonomous packet copy transmission of a UE is shown. Figure 2BIn the example, it is assumed that the cells available for the logical channel are cell 1 (2b-30) and cell 2 (2b-40). Because the UE measures the channel quality of both cell 1 (2b-30) and cell 2 (2b-40), these values ​​can be used to derive the measurement value (2b-50) of the channel quality of the RLC entity 2b-10 (or the corresponding logical channel 2b-20). In this case, the measurement value of the channel quality of the RLC entity 2b-10 (or the corresponding logical channel 2b-20) can be one of the average, minimum, maximum and median values ​​of the measurement values ​​of the cells available to the RLC entity 2b-10. In this case, the available cells can be configured cells or activated cells among the configured cells. Figure 2B The measurement value of the channel quality mentioned in may include one of reference signal received power (RSRP), reference signal received quality (RSRQ), signal to interference and noise ratio (SINR) and channel quality indicator (CQI). In addition, the measurement value may be a value of applying one or more of L1 filtering or L3 filtering.

[0117] Figure 2C Another method of calculating the measurement value of the RLC entity according to an embodiment of the present disclosure is shown.

[0118] Reference Figure 2C , the activation and deactivation of packet copy transmission can be configured by the base station. However, the activation and deactivation of packet copy transmission by the base station may take a long time until the base station recognizes the state change of the UE and issues an activation or deactivation command. In addition, when the UE does not accurately receive the packet copy activation or deactivation command, additional delay time may occur. In order to reduce this inefficiency, the UE may autonomously perform packet copy transmission according to a configured or pre-configured rule. The rule may be the result of measuring the cells that can be used by the radio bearer performing the packet copy transmission. Figure 2C A method for defining measurement values ​​for an RLC entity (or corresponding logical channel) performing autonomous packet copy transmission of a UE is shown. Figure 2C In the example, it is assumed that the cells in which the logical channel is available are cell 1 (2c-30) and cell 2 (2c-40). In this case, among the cells available for the RLC entity 2c-10, the channel quality of the configured or preconfigured representative cell can be used as the channel quality (2c-50) of the RLC entity 2c-10 (or the corresponding logical channel 2c-20). Figure 2CIn the example, it is assumed that cell 1 (2c-30) is configured as a representative cell. Which cell will be the representative cell may be included in the RRC configuration message of the base station, or may be configured according to a predetermined rule. For example, the cell with the lowest (or highest) cell index value among the available cells may be the representative cell. In this case, the available cell may be a configured cell or an activated cell among the configured cells. Figure 2C The measurement value of the channel quality mentioned in may include one of RSRP, RSRQ, SINR and CQI. In addition, the measurement value may be a value to which one or more of L1 filtering or L3 filtering is applied.

[0119] Figure 2D A method of calculating a measurement value of a radio bearer according to an embodiment of the present disclosure is shown.

[0120] Reference Figure 2D , the activation and deactivation of packet copy transmission can be configured by the base station. However, the activation and deactivation of packet copy transmission by the base station may take a long time until the base station recognizes the state change of the UE and issues an activation or deactivation command. In addition, when the UE does not accurately receive the packet copy activation or deactivation command, additional delay time may occur. In order to reduce this inefficiency, the UE may autonomously perform packet copy transmission according to a configured or pre-configured rule. The rule may be the result of measuring the cells that can be used by the radio bearer performing the packet copy transmission. Figure 2D A method of defining measurement values ​​for a radio bearer performing autonomous packet duplication transmission of a UE is shown. Figure 2D In the embodiment, it is assumed that the radio bearer 2d-10 includes a total of three RLC entities, such as RLC 1 (2d-30), RLC 2 (2d-40) and RLC 3 (2d-50) and PDCP 2d-20. In addition, RLC 1 can correspond to logical channel 1 (2d-60), RLC 2 can correspond to logical channel 2 (2d-70), and RLC 3 can correspond to logical channel 3 (2d-80). It is assumed that logical channel 1 (2d-60) can use cell 1 (2d-90) and cell 2 (2d-100), logical channel 2 (2d-70) can use cell 4 (2d-120), cell 5 (2d-130) and cell 6 (2d-140), and logical channel 3 (2d-80) can use cell 8 (2d-160). In this example, cell 3 (2d-110) and cell 7 (2d-150) exist but are not used.

[0121] The list of cells available for each logical channel can be sent by including the list of cells available for each logical channel in the logical channel configuration in the RRC configuration message sent from the base station to the UE. As described above, because the RLC entity and the logical channel can have a one-to-one correspondence with each other, the list of cells available for the logical channel can correspond to the list of cells available for the RLC entity. Because the UE measures the channel quality of each cell, the measured value of the channel quality of the radio bearer can be derived by using the measured value of the cell available in the RLC entity (logical channel) configured in the radio bearer (2d-200). In this case, the measured value of the channel quality of the radio bearer can be one of the average value, minimum value, maximum value and median value of the measured value of the corresponding cell. In this case, the available cell can be a configured cell or an activated cell among the configured cells. Figure 2D The measurement value of the channel quality mentioned in may include one of RSRP, RSRQ, SINR and CQI. In addition, the measurement value may be a value to which one or more of L1 filtering or L3 filtering is applied.

[0122] Figure 2E Another method of calculating a measurement value of a radio bearer according to an embodiment of the present disclosure is shown.

[0123] Reference Figure 2E , the activation and deactivation of packet copy transmission can be configured by the base station. However, the activation and deactivation of packet copy transmission by the base station may take a long time until the base station recognizes the state change of the UE and issues an activation or deactivation command. In addition, when the UE does not accurately receive the packet copy activation or deactivation command, additional delay time may occur. In order to reduce this inefficiency, the UE may autonomously perform packet copy transmission according to a configured or pre-configured rule. The rule may be the result of measuring the cells that can be used by the radio bearer performing the packet copy transmission. Figure 2E A method of defining measurement values ​​for a radio bearer performing autonomous packet duplication transmission of a UE is shown. Figure 2EIn the embodiment, it is assumed that the radio bearer 2e-10 includes a total of three RLC entities (e.g., RLC 1 (2e-30), RLC 2 (2e-40), and RLC 3 (2e-50)) and PDCP 2e-20. In addition, RLC 1 (2e-30) can correspond to logical channel 1 (2e-60), RLC 2 (2e-40) can correspond to logical channel 2 (2e-70), and RLC 3 (2e-50) can correspond to logical channel 3 (2e-80). It is assumed that logical channel 1 (2e-60) can use cell 1 (2e-90) and cell 2 (2e-100), logical channel 2 (2e-70) can use cell 4 (2e-120), cell 5 (2e-130), and cell 6 (2e-140), and logical channel 3 (2e-80) can use cell 8 (2e-160). In this example, cell 3 (2e-110) and cell 7 (2e-150) exist but are not used.

[0124] The list of cells available for each logical channel can be sent by including the list of cells available for each logical channel in the logical channel configuration in the RRC configuration message sent from the base station to the UE. As described above, because the RLC entity and the logical channel can have a one-to-one correspondence with each other, the list of cells available for the logical channel can correspond to the list of cells available for the RLC entity. Because the UE measures the channel quality of each cell, the measurement value of the channel quality of the radio bearer can be derived by using the measurement value of a representative cell among the cells available in the RLC entity (logical channel) configured in the radio bearer (2e-200). Figure 2E In the example, it is assumed that cell 2 (2E-100) is configured as a representative cell. Which cell will be the representative cell may be included in the RRC configuration message of the base station, or may be configured according to a predetermined rule. For example, the cell with the lowest (or highest) cell index value among the available cells may be the representative cell. In this case, the available cell may be a configured or pre-configured cell, or a cell activated among the configured or pre-configured cells. Figure 2E The measurement value of the channel quality mentioned in may include one of RSRP, RSRQ, SINR and CQI. In addition, the measurement value may be a value to which one or more of L1 filtering or L3 filtering is applied.

[0125] Figure 2F is a flowchart illustrating a method of a UE performing autonomous packet copy transmission according to an embodiment of the present disclosure.

[0126] Reference Figure 2F UE can use Figure 2B or Figure 2CThe UE may determine whether to perform packet copy transmission by itself based on the measurement value of the RLC entity described in . When packet copy transmission is configured in a certain radio bearer, in operation 2f-10, the UE may perform calculation of the measurement value of the RLC entity for packet copy transmission. The calculation of the measurement value may be Figure 2B or Figure 2C In this case, in operation 2f-20, it can be confirmed whether the measurement values ​​of all RLC entities used for packet transmission in the radio bearer are less than, greater than or equal to the configured or pre-configured threshold. However, according to an embodiment of the present disclosure, it can be determined whether the measurement value is less than, greater than or equal to the threshold of some RLC entities among all configured RLC entities. When the measurement values ​​of all RLC entities used for packet transmission in the radio bearer are less than, greater than or equal to the configured or pre-configured threshold, the UE can perform packet copy transmission in operation 2f-30. When the measurement value of the RLC entity does not meet the operating condition 2f-20, the packet copy transmission may not be performed in operation 2f-40. That is, the UE can perform packet copy transmission only when packet copy transmission is required. Herein, when the UE does not perform packet copy transmission, the packet may be sent only to a pre-configured master RLC entity, or the packet may be sent to one of the configured RLC entities. When the packet copy transmission is deactivated, when the split bearer operation should be performed, threshold-based data transmission for the split bearer operation may be performed by using one primary cell group (MCG) RLC and one secondary cell group (SCG) RLC.

[0127] Figure 2G is another flow chart illustrating a method of a UE performing autonomous packet copy transmission according to an embodiment of the present disclosure.

[0128] Reference Figure 2G UE can use Figure 2B or the measurement value of the RLC entity described in 2C to determine whether to perform packet copy transmission itself. When packet copy transmission is configured in a certain radio bearer, in operation 2g-10, the UE may perform calculation of the measurement value of the RLC entity used for packet copy transmission. The calculation of the measurement value may be performed by using Figure 2Bor 2C. In addition, in operation 2g-20, the UE may determine whether the measurement value of the specific RLC entity of the radio bearer is less than, greater than, or equal to a configured or preconfigured threshold. In this case, the specific RLC entity may be one of the primary RLC entity or the secondary RLC entity. In addition, when the measurement value of the specific RLC entity of the radio bearer is less than, greater than, or equal to the configured or preconfigured threshold, the UE may perform packet copy transmission in operation 2g-30. When the measurement value of the specific RLC entity does not meet the conditions of operation 2g-20, in operation 2g-40, the UE may not perform packet copy transmission. That is, the UE may perform packet copy transmission only when packet copy transmission is required. Herein, when the UE does not perform packet copy transmission, the packet may be sent only to a preconfigured primary RLC entity, the packet may be sent only to a specific RLC entity used to determine the measurement value of the specified packet copy transmission in operation 2g-20, or the packet may be sent to any one of the configured RLC entities. When the packet copy transmission is deactivated, when the split bearer operation should be performed, threshold-based data transmission for the split bearer operation can be performed by using one MCGRLC and one SCG RLC.

[0129] Figure 2H A method for configuring autonomous packet copy transmission of a UE according to an embodiment of the present disclosure is shown.

[0130] Reference Figure 2H , the base station 2h-10 can be configured with a radio bearer for performing packet copy transmission to the UE 2h-20 through an RRC configuration (2h-30) or a reconfiguration message (not shown). In this case, the base station 2h-10 can configure whether to perform spontaneous packet copy transmission of the UE 2h-20 for each radio bearer. In addition, the base station 2h-10 can also notify whether spontaneous packet copy transmission will be performed under a certain condition. The conditions for performing packet copy transmission can be determined based on the above-mentioned measurement values ​​of the RLC entity or the measurement values ​​of the radio bearer. After receiving the RRC configuration or reconfiguration message (not shown) from the base station 2h-10, the UE 2h-20 can send an RRC configuration or reconfiguration completion message (2h-40) to the base station 2h-10.

[0131] Fig.2I A process of notifying a UE of a packet duplication activation state according to an embodiment of the present disclosure is shown.

[0132] Reference Fig.2I, when UE 2i-10 activates or deactivates packet copy transmission under conditions such as configuration or preconfigured conditions, it may be necessary to notify the base station 2i-20 of the process. When the configured or preconfigured packet copy transmission conditions (2i-30) are met, UE 2i-10 can notify the base station 2i-20 that the spontaneous packet copy transmission of UE 2i-10 has started (2i-40) and perform packet copy transmission (2i-50). In this case, the message indicating that the spontaneous packet copy transmission has been performed may include a radio bearer ID to indicate in which radio bearer the packet copy transmission is being performed. According to an embodiment of the present disclosure, the message indicating that the packet copy transmission has been performed may include a logical channel identifier corresponding to the RLC entity to indicate the RLC entity that is performing the packet copy transmission. In addition, the message indicating that the packet copy transmission has been performed may include information indicating which packet copy transmission condition has been met, or may include measurement results of each RLC entity or measurement results of the radio bearer. Fig.2I In the embodiment, the packet copy notification (2i-40) and the packet copy execution (2i-50) can be started at the same time or can be executed in a similar time sequence.

[0133] When the packet copy transmission stop condition (2i-60) is met while performing packet copy transmission (2i-50), the UE may send a packet copy stop notification message to the base station (2i-70), and may no longer perform packet copy transmission (2i-80). Herein, the packet copy transmission stop condition (2i-60) may be the opposite condition of the packet copy transmission condition (2i-30), or may be another preconfigured condition. The message (2i-70) indicating that the spontaneous packet copy transmission has been stopped may include a radio bearer ID to indicate in which radio bearer the packet copy transmission is stopped. According to an embodiment of the present disclosure, the message may include a logical channel identifier corresponding to the RLC entity to notify the RLC entity that the packet copy transmission is being executed or stopped. In addition, the message may include information indicating which packet copy transmission stop condition has been met, or may include measurement results of each RLC entity or measurement results of the radio bearer. Fig.2I In the process, the packet copy stop notification (2i-70) and the packet copy non-execution operation (2i-80) may be started at the same time or may be executed sequentially at a similar time.

[0134] Figure 2J A process of triggering a regular buffer status report (BSR) according to a UE's autonomous packet copy activation according to an embodiment of the present disclosure is shown.

[0135] Reference Figure 2J, when UE 2j-10 activates or deactivates packet copy transmission under conditions such as configuration or preconfigured conditions, a process of requesting base station 2j-20 to allocate radio resources for packet copy transmission may be necessary. When UE 2j-10 meets the pre-configured packet copy transmission conditions (2j-30), UE 2j-10 can trigger a regular buffer status report (BSR) to send a regular BSR to base station 2j-20 (2j-40) and perform packet copy transmission (2j-50). Figure 2J In the present invention, the triggering and transmission of the regular BSR (2j-40) and the packet copy execution (2j-50) can start simultaneously or can be performed in a similar time sequence. Thereafter, when UE 2j-10 satisfies the packet copy transmission stop condition (2j-60) while performing the packet copy transmission (2j-50), UE 2j-10 can trigger a regular BSR and send a regular BSR (2j-70) to the base station 2j-20 to notify the base station UE2j-20 that it no longer needs to allocate wireless resources for the packet copy transmission and can no longer perform the packet copy transmission (2j-80). Herein, the packet copy transmission stop condition (2i-60) can be the opposite condition of the packet copy transmission condition (2i-30), or can be another configured condition or a pre-configured condition. In the present invention, the packet copy transmission stop condition (2i-60) can be the opposite condition of the packet copy transmission condition (2i-30), or can be another configured condition or a pre-configured condition. Figure 2J In the process, the triggering and transmission of the conventional BSR (2j-70) and the packet copy non-execution operation (2j-80) can be started simultaneously or can be performed in a similar time sequence.

[0136] Figure 2K is a flowchart illustrating a method of a UE performing autonomous packet copy transmission according to an embodiment of the present disclosure.

[0137] Reference Figure 2K, the UE can determine whether to perform packet copy transmission by itself by using the measurement value of the above-mentioned radio bearer. When packet copy transmission is configured in a certain radio bearer, in operation 2k-10, the UE can perform calculation of the measurement value of the radio bearer in which the packet copy transmission is configured. The above method can be used to calculate the measurement value. In this case, in operation 2k-20, the UE can determine whether the measurement value of the radio bearer is less than, greater than or equal to the configured or pre-configured threshold. In addition, when the measurement value of the radio bearer is less than, greater than or equal to the configured or pre-configured threshold, the UE can perform packet copy transmission in operation 2k-30. When the measurement value of the radio bearer does not meet the operating condition 2k-20, the packet copy transmission may not be performed in operation 2k-40. That is, the UE can perform packet copy transmission only when packet copy transmission is required. In this article, when the UE does not perform packet copy transmission, the packet can be sent only to a pre-configured primary RLC entity, or the packet can be sent to any one of the configured RLC entities. When the packet copy transmission is deactivated, when the split bearer operation should be performed, threshold-based data transmission for the split bearer operation can be performed by using one MCG RLC and one SCG RLC.

[0138] Figure 2L A split bearer operation when packet copy transmission is deactivated according to an embodiment of the present disclosure is illustrated.

[0139] Reference Figure 2L , Figure 2L The embodiment of the present invention can be used not only for the autonomous packet copy transmission of the UE, but also for deactivating the packet copy transmission under the control of the base station. Figure 2L , it is assumed that the radio bearer 2l-10 includes a total of four RLC entities 2l-20, 2l-30, 2l-40 and 2l-50 and PDCP 2l-15 configured for the radio bearer 2l-10 in which packet replication is configured. It is assumed that among the total four RLC entities, RLC 1 (2l-20) and RLC 2 (2l-30) are MCGRLC (2l-60) configured in the MCG, and RLC 3 (2l-40) and RLC 4 (2l-50) are SCG RLC (2l-70) configured in the SCG. When the packet replication transmission is deactivated (2l-80), the corresponding radio bearer can return to the separated bearer operation. In this article, the separated bearer may mean a radio bearer including one MCG RLC and one SCG RLC. Therefore, one MCGRLC and one SCG RLC should be selected.

[0140] For this purpose, the main RLC 21-120 and the auxiliary RLC 21-140 can be configured. The main RLC 21-120 can mean an RLC entity that is always used for packet transmission. The auxiliary RLC 21-140 can mean an RLC entity used for transmission when there is data greater than or equal to the threshold value of the separated bearer. When the packet copy transmission is deactivated, other RLC entities except the main RLC entity 21-120 or the auxiliary RLC entity 21-140 may not be used for packet transmission. The main RLC 21-120 and the auxiliary RLC 21-140 may be RLC entities belonging to different cell groups. The main RLC 21-120 and the auxiliary RLC 21-140 can be configured at the time of RRC configuration from the base station, or can be configured according to a predetermined rule. When the RLC entity is not configured at the time of RRC configuration from the base station, the main RLC 21-120 and the auxiliary RLC 21-140 can be configured in ascending order (or descending order) of the logical channel identifier value. According to an embodiment of the present disclosure, an RLC entity capable of using a PCell or a PSCell may be configured as a primary RLC 21-120 or a secondary RLC 21-140. In addition, an RLC entity that is not used for split bearer operation despite being configured as an RLC entity may be referred to as a secondary RLC.

[0141] Figure 2M is a block diagram showing the structure of a base station according to an embodiment of the present disclosure.

[0142] Reference Figure 2M , the base station may include a transceiver 2m-10, a base station controller 2m-20 and a memory 2m-30. In the present disclosure, the base station controller 2m-20 may be defined as a circuit, a dedicated integrated circuit or at least one processor.

[0143] The transceiver 2m-10 can exchange signals with other network entities. For example, the transceiver 2m-10 can send system information to the UE and can send a synchronization signal or a reference signal to it.

[0144] According to an embodiment of the present disclosure, the base station controller 2m-20 can control the overall operation of the base station. For example, the base station controller 2m-20 can control the signal flow between the various blocks to perform operations according to the above-mentioned flowchart. According to an embodiment of the present disclosure, the base station controller 2m-20 can configure a radio bearer for performing packet copy transmission to the UE, and can control the components of the base station to indicate whether the UE will perform spontaneous packet copy transmission under specific conditions.

[0145] The memory 2m-30 may store at least one of information sent or received by the transceiver 2m-10 or information generated by the base station controller 2m-20.

[0146] Figure 2Nis a block diagram showing the structure of a UE according to an embodiment of the present disclosure.

[0147] Reference Figure 2N , the UE may include a transceiver 2n-10, a terminal controller 2n-20 and a memory 2n-30. In the present disclosure, the terminal controller 2n-20 may be defined as a circuit, a dedicated integrated circuit or at least one processor.

[0148] The transceiver 2n-10 may exchange signals with other network entities. For example, the transceiver 2n-10 may receive system information from a base station, and may receive a synchronization signal or a reference signal from a base station.

[0149] According to an embodiment of the present disclosure, the terminal controller 2n-20 can control the overall operation of the UE. For example, the terminal controller 2n-20 can control the signal flow between the various blocks to perform the operation according to the above-mentioned flowchart. According to an embodiment of the present disclosure, the terminal controller 2n-20 can perform the calculation of the measurement value of the radio bearer in which the packet copy transmission is configured, and can control the components of the UE to perform or not perform the packet copy transmission based on the measurement value.

[0150] The memory 2n-30 may store at least one of information sent or received by the transceiver 2n-10 or information generated by the terminal controller 2n-20.

[0151] The methods according to the embodiments of the present disclosure described in the specification or claims may be implemented by hardware, software or a combination thereof.

[0152] When the method is implemented by software, a non-transitory computer-readable storage medium or a computer program product may be provided to store one or more programs (software modules). One or more programs stored in a computer-readable storage medium or a computer program product may be configured to be executed by one or more processors in an electronic device. One or more programs may include instructions for causing an electronic device to perform a method according to an embodiment of the present disclosure described in the specification or claims.

[0153] These programs (software modules or software) can be stored in random access memory (RAM), non-volatile memory including flash memory, read-only memory (ROM), electrically erasable programmable ROM (EEPROM), magnetic disk storage device, compact disk-ROM (CD-ROM), digital versatile disk (DVD), other types of optical storage devices or magnetic tapes. In addition, the program can be stored in a memory configured by a combination of some or all of such storage devices. In addition, each memory can be set to multiple.

[0154] The program can be stored in a connectable storage device that can be accessed through a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WLAN), or a storage area network (SAN), or through a communication network configured by any combination thereof. Such a storage device can be connected to a device that performs an embodiment of the present disclosure through an external port. In addition, a separate storage device on a communication network can be connected to a device that performs an embodiment of the present disclosure.

[0155] In the above-mentioned specific embodiments of the present disclosure, the components included in the present disclosure are expressed as singular or plural, depending on the specific embodiments presented in the present disclosure. However, for ease of description, singular or plural expressions are selected according to the presented situation, and the present invention is not limited to singular or plural components. Components expressed in plural can even be configured as singular, or components expressed in singular can even be configured as plural.

[0156] The described embodiments provide an apparatus and method capable of efficiently providing services in a wireless communication system.

[0157] It should be understood that the embodiments of the present disclosure described herein should be considered to be merely descriptive in nature and not for the purpose of limitation. In addition, the embodiments of the present disclosure may be combined for operation when necessary. For example, parts of the embodiments of the present disclosure and another embodiment may be combined with each other. In addition, the embodiments of the present disclosure may be implemented in other systems such as LTE systems, 5G or NR systems, and other modifications may be made therein based on the spirit of the above-mentioned embodiments of the present disclosure.

[0158] While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.

Claims

1. A method performed by a user equipment UE in a wireless communication system, the method comprising: Receiving a radio resource control RRC message; In a case where more than two Radio Link Control RLC entities are associated with a Packet Data Convergence Protocol PDCP entity of the UE and packet duplication is deactivated, identifying whether the information included in the RRC message configures a secondary RLC entity for returning to a split bearer operation, and identifying whether an amount of data associated with a primary RLC entity and the secondary RLC entity is equal to or greater than a threshold associated with the split bearer operation; as well as sending a PDCP protocol data unit (PDU) using the primary RLC entity or the secondary RLC entity based on an amount of data associated with the primary RLC entity and the secondary RLC entity being equal to or greater than a threshold associated with the split bearer operation, and the information included in the RRC message configures the secondary RLC entity for returning the split bearer operation; The cell group to which the primary RLC entity belongs is different from the cell group to which the secondary RLC entity belongs.

2. The method according to claim 1, further comprising: Based on an amount of data associated with the primary RLC entity and the secondary RLC entity being less than a threshold associated with the split bearer operation, the PDCP PDU is transmitted using the primary RLC entity.

3. The method according to claim 1, wherein: The RRC message also includes information related to the primary RLC entity.

4. The method according to claim 1, wherein: The primary RLC entity is associated with a primary cell group MCG, and the secondary RLC entity is associated with a secondary cell group SCG.

5. The method according to claim 1, further comprising: The packet duplication is performed using at least two RLC entities of the more than two RLC entities.

6. A user equipment (UE) configured to operate in a wireless communication system, the UE comprising: Transceiver; and at least one processor coupled to the transceiver and configured to: Receiving a radio resource control RRC message; In a case where more than two Radio Link Control RLC entities are associated with a Packet Data Convergence Protocol PDCP entity of the UE and packet duplication is deactivated, identifying whether the information included in the RRC message configures a secondary RLC entity for returning to a split bearer operation, and identifying whether an amount of data associated with a primary RLC entity and the secondary RLC entity is equal to or greater than a threshold associated with the split bearer operation; as well as sending a PDCP protocol data unit (PDU) using the primary RLC entity or the secondary RLC entity based on an amount of data associated with the primary RLC entity and the secondary RLC entity being equal to or greater than a threshold associated with the split bearer operation, and the information included in the RRC message configures the secondary RLC entity for returning the split bearer operation; The cell group to which the primary RLC entity belongs is different from the cell group to which the secondary RLC entity belongs.

7. The UE according to claim 6, wherein: The at least one processor is further configured to: Based on an amount of data associated with the primary RLC entity and the secondary RLC entity being less than a threshold associated with the split bearer operation, the PDCP PDU is transmitted using the primary RLC entity.

8. The UE according to claim 6, wherein: The RRC message also includes information related to the primary RLC entity.

9. The UE according to claim 6, wherein: The primary RLC entity is associated with a primary cell group MCG, and the secondary RLC entity is associated with a secondary cell group SCG.

10. The UE according to claim 6, wherein: The at least one processor is further configured to: The packet duplication is performed using at least two RLC entities of the more than two RLC entities.

11. A method performed by a base station in a wireless communication system, the method comprising: Sending a radio resource control (RRC) message to a user equipment (UE), wherein, in a case where more than two radio link control RLC entities are associated with a packet data convergence protocol PDCP entity of the UE and packet duplication is deactivated, whether the information included in the RRC message configures a secondary RLC entity for returning to a split bearer operation is identified at the UE, and whether an amount of data associated with a primary RLC entity and the secondary RLC entity is equal to or greater than a threshold value related to the split bearer operation is identified at the UE, and wherein, based on the amount of data associated with the primary RLC entity and the secondary RLC entity being equal to or greater than a threshold associated with the split bearer operation, and the information included in the RRC message configures the secondary RLC entity for returning the split bearer operation, a PDCP protocol data unit (PDU) is sent at the UE using the primary RLC entity or the secondary RLC entity; The cell group to which the primary RLC entity belongs is different from the cell group to which the secondary RLC entity belongs.

12. The method according to claim 11, wherein: Based on an amount of data associated with the primary RLC entity and the secondary RLC entity being less than a threshold associated with the split bearer operation, the PDCP PDU is transmitted at the UE using the primary RLC entity.

13. The method according to claim 11, wherein: The RRC message also includes information related to the primary RLC entity.

14. The method according to claim 11, wherein: The primary RLC entity is associated with a primary cell group MCG, and the secondary RLC entity is associated with a secondary cell group SCG.

15. The method according to claim 11, wherein: The packet duplication is performed at the UE using at least two RLC entities of the more than two RLC entities.

16. A base station configured to operate in a wireless communication system, the base station comprising: Transceiver; and at least one processor coupled to the transceiver and configured to: Sending a radio resource control (RRC) message to a user equipment (UE), wherein, in a case where more than two radio link control RLC entities are associated with a packet data convergence protocol PDCP entity of the UE and packet duplication is deactivated, whether the information included in the RRC message configures a secondary RLC entity for returning to a split bearer operation is identified at the UE, and whether an amount of data associated with a primary RLC entity and the secondary RLC entity is equal to or greater than a threshold value related to the split bearer operation is identified at the UE, and wherein, based on the amount of data associated with the primary RLC entity and the secondary RLC entity being equal to or greater than a threshold associated with the split bearer operation, and the information included in the RRC message configures the secondary RLC entity for returning the split bearer operation, a PDCP protocol data unit (PDU) is sent at the UE using the primary RLC entity or the secondary RLC entity; The cell group to which the primary RLC entity belongs is different from the cell group to which the secondary RLC entity belongs.

17. The base station according to claim 16, wherein: Based on an amount of data associated with the primary RLC entity and the secondary RLC entity being less than a threshold associated with the split bearer operation, the PDCP PDU is transmitted at the UE using the primary RLC entity.

18. The base station according to claim 16, wherein: The RRC message also includes information related to the primary RLC entity.

19. The base station according to claim 16, wherein: The primary RLC entity is associated with a primary cell group MCG, and the secondary RLC entity is associated with a secondary cell group SCG.

20. The base station according to claim 16, wherein: The packet duplication is performed at the UE using at least two RLC entities of the more than two RLC entities.

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