Method and device for establishing radio bearer in wireless communication system

Abstract

A method for performing vehicle-to-everything (V2X) communication executed by a terminal, comprising: applying first configuration information to a side link radio bearer; receiving second configuration information according to the movement of the terminal; determining a time point at which the second configuration information is to be applied; and changing the configuration of the side link radio bearer based on the time point and the second configuration information.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus for establishing a radio bearer in a wireless communication system. Background Art

[0002] In order to meet the growing demand for wireless data traffic after the commercialization of 4G communication systems, efforts have been made to develop improved 5G communication systems or pre-5G communication systems. For this reason, 5G communication systems or pre-5G communication systems are called super 4G network communication systems or post-LTE systems. In order to achieve high data rates, it is considered to implement 5G communication systems in millimeter wave (mmW) bands (e.g., 80GHz bands). In order to reduce the transmission path loss of radio waves and increase the transmission distance of radio waves in millimeter wave bands, in 5G communication systems, technologies such as beamforming, massive multiple input and multiple output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antennas are being discussed. In addition, in order to improve the network of the system, in 5G communication systems, technologies such as evolved small base stations, advanced small base stations, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device communication (D2D), wireless backhaul, mobile networks, collaborative communications, coordinated multi-point (CoMP), and interference elimination are being developed. In addition, in 5G communication systems, advanced coding modulation (ACM) schemes such as hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC), and enhanced network access schemes such as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) or sparse code multiple access (SCMA) are being developed.

[0003] The Internet is evolving from a human-centric network through which people generate and consume information to an Internet of Things (IoT) network through which distributed components such as things send or receive information to each other and process the information. Among them, Internet of Everything (IoE) technology, which combines big data processing technology with IoT technology by connecting to cloud servers, etc., is emerging. In order to realize IoT, technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology and security technology are required, so sensor networks for connection between things, machine-to-machine (M2M) communication, machine type communication (MTC), etc. have been studied recently. In the IoT environment, intelligent Internet technology (IT) services can be provided for collecting and analyzing data generated by connected things and creating new value in people's lives. Through the integration and combination of existing information technology (IT) with various industries, 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 care.

[0004] Therefore, various attempts are being made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, M2M communications, or MTC are implemented by 5G communication technologies such as beamforming, MIMO, or array antennas. The application of cloud RAN, which is a big data processing technology, can also be used as an example of the fusion of 3eG technology and IoT technology.

[0005] Since the wireless communication system can provide various services due to the development of the wireless communication system as described above, the wireless communication system, in particular, requires a method of smoothly providing services by using packet retransmission. Summary of the invention

[0006] Solution to the problem

[0007] Provided are a method and apparatus capable of effectively supporting services in a wireless communication system.

[0008] 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 embodiments disclosed herein.

[0009] According to an embodiment of the present disclosure, a method for performing vehicle-to-everything (V2X) communication performed by a terminal includes: applying first configuration information to a side link radio bearer; receiving second configuration information based on the movement of the terminal; determining a time point to apply the second configuration information; and changing the configuration of the side link radio bearer based on the time point and the second configuration information.

[0010] The time point may be a time point at which the maxRetxThreshold included in the first configuration information is changed to the maxRetxThreshold included in the second configuration information.

[0011] The method may also include: retransmitting one or more radio link control protocol data units (RLC PDUs) based on the first configuration information; and reporting the determined result to a higher layer when the number of retransmissions of one or more RLC PDUs is greater than or equal to the maxRetxThreshold included in the second configuration information.

[0012] The time point may be a time point at which a Service Data Association Protocol (SDAP) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, or a Medium Access Control (MAC) layer is released.

[0013] The changing of the configuration of the sidelink radio bearer may further include changing a configuration associated with a length of the sequence number at the point in time.

[0014] The time point may be a time point at which a timer expires, is restarted, or is stopped, and the timer may be at least one of a reordering timer, a reassembly timer, or a polling retransmission timer.

[0015] The time point may be a time point when the state variable value is reset or changed to an initial value, and the state variable value may be associated with the poll PDU or pollByte.

[0016] The method may further include sending information to another terminal indicating that the configuration of the sidelink radio bearer has changed.

[0017] According to an embodiment of the present disclosure, a terminal for performing vehicle-to-everything (V2X) communication includes: a transceiver; and at least one processor, wherein the at least one processor is connected to the transceiver and configured to apply first configuration information to a side link radio bearer, receive second configuration information according to the movement of the terminal, determine a time point to apply the second configuration information, and change the configuration of the side link radio bearer based on the time point and the second configuration information.

[0018] The time point may be a time point at which the maxRetxThreshold included in the first configuration information is changed to the maxRetxThreshold included in the second configuration information.

[0019] The at least one processor may be further configured to: retransmit one or more radio link control protocol data units (RLC PDUs) based on the first configuration information, and report a determination result to a higher layer when the number of retransmissions of the RLC PDU is greater than or equal to the maxRetxThreshold included in the second configuration information.

[0020] The time point may be a time point at which a Service Data Association Protocol (SDAP) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, or a Medium Access Control (MAC) layer is released.

[0021] The at least one processor may be further configured to change a configuration associated with a length of the sequence number at the point in time.

[0022] The time point may be a time point when a timer expires, is restarted, or is stopped, and the timer may be at least one of a reordering timer, a reassembly timer, or a polling retransmission timer.

[0023] The time point may be a time point at which a state variable value is reset or changed to an initial value, and the state variable value may be associated with a poll PDU or pollByte.

[0024] The at least one processor is further configured to transmit information to another terminal indicating that the configuration of the sidelink radio bearer has changed.

[0025] Before proceeding to the following detailed description, it may be helpful to set forth definitions of certain words and phrases used throughout the patent document: the terms "include" and "comprising" and their derivatives mean including without limitation; the term "or" is inclusive, meaning and / or; the phrases "associated with" and "associated with" and their derivatives may mean including, included in, associated with, containing, contained in, connected to or connected with, connected to or connected with, communicating with, cooperating with, interleaved, juxtaposed, adjacent, bound to or bound with, having, having the property of, etc.; and the term "controller" refers to any device, system, or part thereof that controls at least one operation, such device may be implemented in hardware, firmware, or software, or a combination of at least two of the foregoing. It should be noted that the functionality associated with any particular controller may be centralized or distributed, whether locally or remotely.

[0026] In addition, the various functions described below can be implemented or supported by one or more computer programs, each of which is formed by a computer-readable program code and is contained in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, processes, functions, objects, classes, instances, related data, or parts thereof suitable for implementation in a suitable computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code, and executable code. The phrase "computer-readable medium" includes any type of medium that can be accessed by a computer, such as a read-only memory (ROM), a random access memory (RAM), a hard drive, a compact disc (CD), a digital video disc (DVD), or any other type of memory. "Non-transitory" computer-readable media does not include wired, wireless, optical, or other communication links that transmit temporary electrical or other signals. A non-transitory computer-readable medium includes a medium that can permanently store data, and a medium that can store data and then rewrite data, such as a rewritable optical disc or an erasable storage device.

[0027] Definitions for certain words and phrases are provided throughout this patent document, those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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:

[0029] Figure 1 A scenario of performing inter-terminal communication in vehicle-to-everything (V2X) communication according to an embodiment of the present disclosure is shown;

[0030] Figure 2 The present invention shows a mobility scenario of a transmitting / receiving terminal in V2X communication according to an embodiment of the present disclosure;

[0031] Figure 3 A method for reconfiguring a V2X communication or a side link radio bearer (SLRB) in a mobility scenario of a V2X communication terminal according to an embodiment of the present disclosure is shown;

[0032] Figure 4 is a flowchart of an operation of reconfiguring V2X communication or SLRB in a mobility scenario of a V2X communication terminal according to an embodiment of the present disclosure;

[0033] Figure 5 A method for reconfiguring V2X communication or SLRB in a mobility scenario of a V2X communication terminal according to an embodiment of the present disclosure is shown;

[0034] Figure 6 is a flowchart of an operation of reconfiguring V2X communication or SLRB in a mobility scenario of a V2X communication terminal according to an embodiment of the present disclosure;

[0035] Figure 7 is a flowchart of an operation of reconfiguring V2X communication or SLRB in a mobility scenario of a V2X communication terminal according to an embodiment of the present disclosure;

[0036] Figure 8 A method for reconfiguring V2X communication or SLRB in a mobility scenario of a V2X communication terminal according to an embodiment of the present disclosure is shown;

[0037] Fig. 9 is a flowchart of an operation of reconfiguring V2X communication or SLRB in a mobility scenario of a V2X communication terminal according to an embodiment of the present disclosure;

[0038] Fig.10 is a flowchart of an operation of applying a reconfiguration value of a V2X communication or SLRB in a mobility scenario of a V2X communication terminal according to an embodiment of the present disclosure;

[0039] Fig.11 is a flowchart of an operation of applying reconfiguration of a maximum retransmission threshold of a SLRB in a mobility scenario of a V2X communication terminal according to an embodiment of the present disclosure;

[0040] Fig.12is a flowchart of a process of applying a reconfiguration value of a V2X communication or SLRB in a mobility scenario of a V2X communication terminal according to an embodiment of the present disclosure;

[0041] Fig.13 is a flowchart of a process of applying a reconfiguration value of a V2X communication or SLRB in a mobility scenario of a V2X communication terminal according to an embodiment of the present disclosure;

[0042] Fig.14 shows different applications of each timer value and constant value applied to a state variable according to an embodiment of the present disclosure;

[0043] Fig.15 is a block diagram of a structure of a base station according to an embodiment of the present disclosure; and

[0044] Fig.16 is a block diagram of a structure of a terminal according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0045] Discussed below Figures 1 to 16 , and the various embodiments used to describe the principles of the present disclosure in this patent document are merely exemplary and should not be interpreted in any way to limit the scope of the present disclosure. Those skilled in the art will appreciate that the principles of the present disclosure can be implemented in any suitably arranged system or device.

[0046] When describing the present disclosure, when it is considered that the relevant well-known functions or configurations may unnecessarily obscure the essence of the present disclosure, the detailed description of the relevant well-known functions or configurations may be omitted. In addition, the terms used below are defined in consideration of the functions in the present disclosure, and may have different meanings according to the purposes of users or operators, habits, etc. Therefore, the terms should be defined based on the description throughout the present disclosure. As used in the following description, terms identifying access nodes, terms indicating network entities, terms indicating messages, terms indicating interfaces between network entities, terms indicating various types of identification information, etc. are all examples for ease of explanation. Therefore, the present disclosure is not limited to the terms to be described later, and other terms representing objects with equivalent technical meanings may be used.

[0047] Throughout this disclosure, the expression "at least one of a, b, or c" indicates 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.

[0048] 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.

[0049] In this disclosure, a controller may also be referred to as a processor.

[0050] Throughout the specification, a layer (or a layer arrangement) may also be referred to as an entity.

[0051] In the following, a base station is a subject that performs resource allocation of a terminal, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a wireless access unit, a base station controller, or a node on a network. Examples of terminals may include user equipment (UE), a mobile base station (MS), a cellular phone, a smart phone, a computer, and a multimedia system capable of performing a communication function. In addition, the term "terminal" may refer to a mobile phone, a NB-IoT device, a sensor, and other wireless communication devices. Of course, base stations and terminals are not limited to the above examples.

[0052] Hereinafter, for convenience of description, the present disclosure uses terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard and / or the 3rd Generation Partnership Project New Radio (NR) standard. However, the present disclosure is not limited to the above terms and names.

[0053] Although the embodiments of the present disclosure are described below with respect to LTE, LTE-Advanced (LTE-A), LTEPro or 5G (or NR) systems as next generation mobile communications, the embodiments of the present disclosure may be applied to other communication systems with similar technical backgrounds and channel configurations. In addition, those skilled in the art will appreciate that the embodiments of the present disclosure may be applied to other communication systems as long as the modifications do not depart from the scope of the present disclosure.

[0054] Embodiments of the present disclosure will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments are shown.

[0055] Figure 1 A scenario of performing inter-terminal communication in vehicle-to-everything (V2X) communication according to an embodiment of the present disclosure is shown.

[0056] For details, refer to Figure 1 , assuming that in V2X communication, the V2X terminals 110, 120, and 130 communicate with each other without using a base station. The transmission method may be one of the following three methods.

[0057] -Unicast: One-to-one communication between a sending terminal and a receiving terminal

[0058] -Multicast: One-to-many communication between a sending terminal and multiple receiving terminals

[0059] -Broadcast: One-to-many communication between a sending terminal and multiple unspecified receiving terminals

[0060] It can be determined which of the above three methods is used for transmission according to the characteristics of the service to be transmitted or the characteristics of the V2X terminal that performs transmission / reception. According to an embodiment of the present disclosure, the base station can determine the transmission method, and the determined transmission method can be transmitted to the terminal via a radio resource control (RRC) configuration. Because this V2X communication is based on communication between terminals, V2X communication can be performed in a connection mode within the coverage of the base station, or in an idle mode or an inactive mode in which the connection with the base station has been released. V2X communication is possible when the terminal has a link state that enables V2X communication to be performed even in a state out of coverage (OOC) of the base station. When a unicast method is used, it can be assumed that two V2X terminals send and receive data, and several methods can be used to set the transmitting terminal, the receiving terminal, and the configuration values ​​such as parameters and timers to be used in the unicast communication. V2X communication is called a side link because the communication is performed between terminals without using a base station. The radio bearer in the side link on which the terminal performs communication is called a side link radio bearer (SLRB).

[0061] In order to support V2X communication regardless of the transmission method, the V2X terminal 110 responsible for transmission may transmit data for V2X communication to one or more receiving V2X terminals 120 and 130. At this time, only terminals that are allowed to receive data transmitted by the V2X terminal 110 responsible for transmission may receive the data. When V2X communication is performed within the coverage of the base station 140, the base station 140 may control the V2X communication. The role that may be performed by the base station 140 may be at least one of RRC connection configuration, allocation of radio resources (frequency and time resources), transmission method configuration, radio bearer establishment, or quality of service (QoS).

[0062] Figure 2 A mobility scenario of a transmitting / receiving terminal in V2X communication according to an embodiment of the present disclosure is shown.

[0063] The terminal 200 with mobility may deviate from the coverage 215 of the serving base station (gNB1) 210, which is the base station to which the terminal 200 belongs, and may move to the coverage 225 of another base station 220, or to an OCC area that is not the coverage of any base station. At this time, the terminal 200 may be configured through an RRC configuration or reconfiguration message of the base station to which the terminal 200 belongs. However, when the terminal 200 is in RRC idle mode or inactive mode, the terminal 200 may receive configuration information of the terminal 200 through a system information block (SIB) received from the base station. Even when the terminal 200 is in connected mode, the configuration of V2X communication or SLRB may be configured based on the SIB. When the terminal 200 moves to an OOC area that is not the coverage of any base station, the configuration of V2X communication or SLRB may be applied based on the preconfiguration used in the OCC.

[0064] according to Figure 2 In an embodiment of the present invention, the terminal 200 is initially located within the coverage 215 of the first base station (gNB1) 210. When the terminal 200 is present in the coverage 215 of the first base station 210, the terminal 200 may apply the configuration information of the V2X communication or SLRB included in the SIB 230 transmitted by the first base station 210. Thereafter, the terminal 200 may move into the coverage 225 of the second base station 220, and may receive the SIB 240 from the second base station 220. At this time, because the terminal 200 is located within the coverage 225 of the second base station 220, the terminal 200 needs to apply the configuration included in the SIB 240 transmitted by the second base station 220 to the terminal 200. In particular, when the current configuration of the pre-configured V2X communication or SLRB is different from the configuration included in the SIB 240 transmitted by the second base station 220, an operation error due to the difference needs to be prevented. This situation is not limited to V2X terminals, but is also applicable to terminals in idle mode or inactive mode that do not receive direct configuration from the base station, or to general terminals operating in the OOC area. The time point at which it is determined that the terminal 200 has moved to the coverage range 225 of the second base station 220 may be a time point at which the terminal 200 can no longer receive the SIB 230 transmitted by the first base station 210, or may be a time point at which the signal strength received by the terminal 200 from the first base station 210 is lower than the sum of the signal strength received by the terminal 200 from the second base station 220 and a certain constant.

[0065] Figure 3 A method for reconfiguring V2X communication or SLRB in a mobility scenario of a terminal of V2X communication according to an embodiment of the present disclosure is shown.

[0066] The terminal 300 with mobility may deviate from the coverage 315 of the serving base station 310 of the base station 310 to which the terminal 300 belongs, and may move to the coverage 325 of another base station 320, or to an OCC area that is not the coverage of any base station. When the terminal 300 is in RRC idle mode or inactive mode, the terminal 300 may receive configuration information of the terminal 300 from the SIB received from the base station. Even when the terminal 300 is in connected mode, V2X communication or SLRB may be configured based on the SIB. When the terminal 300 moves to an OOC area that is not the coverage of any base station, the configuration of V2X communication or SLRB may be applied based on the preconfiguration used in the OCC. However, the time point at which the configuration or preconfiguration is applied when the terminal has moved to the base station, and the information applied may vary according to the implementation.

[0067] according to Figure 3 In an embodiment, the terminal 300 may initially be located within the coverage 315 of the first base station (gNB1) 310. When the terminal 300 is present in the coverage 315 of the first base station 310, the terminal 300 may apply the configuration information of the V2X communication or SLRB included in the SIB 330 sent by the first base station 310 to the terminal 300. Thereafter, the terminal 300 may move to the coverage 325 of the second base station 320, and may receive the SIB 340 from the second base station 320. At this time, because the terminal 300 is located in the coverage 325 of the second base station 320, the terminal 300 needs to apply the configuration included in the SIB 340 sent by the second base station 320 to the terminal 300. In particular, when the current configuration of the pre-configured V2X communication or SLRB is different from the configuration included in the SIB 340 sent by the second base station 320, an operation error due to the difference needs to be prevented. According to Figure 3 In an embodiment, when establishing V2X communication or SLRB, the terminal 300 may apply the configuration included in the SIB 330 transmitted by the first base station 310, and may maintain the configuration until the V2X communication or SLRB is reestablished or released. Therefore, even when the terminal 300 moves to the coverage 325 of the second base station 320, the terminal 300 may maintain the existing configuration of the V2X communication or SLRB without change, and may apply the configuration included in the SIB 340 transmitted by the second base station 320 only for the configuration value of the newly configured V2X communication or SLRB.

[0068] This situation is not limited to V2X terminals, but also applies to terminals in idle mode or inactive mode that do not receive direct configuration from the base station, or to general terminals working in the OOC area. The above configuration method does not need to be applied to the configuration of all V2X communications or the configuration of all SLRBs, and can be applied only to some state variables or some timer values.

[0069] Figure 4 The present invention is a flowchart of an operation of reconfiguring V2X communication or SLRB in a mobility scenario of a terminal of V2X communication according to an embodiment of the present disclosure.

[0070] When the terminal reaches the coverage of the first base station and is able to receive SIB from the first base station (operation 410), when V2X communication or SLRB and the packet data convergence protocol (PDCP) device, radio link control (RLC) device, service data adaptation protocol (SDAP), and medium access control (MAC) device of the SLRB are configured, the terminal can apply the configuration value included in the configuration of the first base station (operation 420). Thereafter, when the terminal reaches the coverage of the second base station and is able to receive SIB from the second base station (operation 430), due to the configuration of the first base station, the terminal can continue to apply the configuration value until the pre-configured V2X communication or SLRB and the pre-configured PDCP device, RLC device, SDAP device, and MAC device of the SLRB are released. And the configuration value included in the configuration of the second base station can be applied only for the V2X communication or SLRB to be newly configured and the PDCP device, RLC device, SDAP device, and MAC device of the SLRB (operation 440).

[0071] Figure 5 A method for reconfiguring V2X communication or SLRB in a mobility scenario of a terminal of V2X communication according to an embodiment of the present disclosure is shown.

[0072] The terminal 500 with mobility may deviate from the coverage 515 of the serving base station 510, which is the base station to which the terminal 500 belongs, and may move to the coverage 525 of another base station 520, or to an OCC area that is not covered by any base station. When the terminal 500 is in RRC idle mode or inactive mode, the terminal 500 may receive configuration information of the terminal 500 from the SIB received from the base station. Even when the terminal 500 is in connected mode, V2X communication or SLRB may be configured based on the SIB. When the terminal 500 moves to an OOC area that is not covered by any base station, the configuration of V2X communication or SLRB may be applied based on the preconfiguration used in the OCC. However, the time point at which the configuration or preconfiguration is applied when the terminal has moved to the base station, and the information applied may vary according to the implementation.

[0073] according to Figure 5 In an embodiment, the terminal 500 is initially located in the coverage 515 of the first base station (gNB1) 510. When the terminal 500 exists in the coverage 515 of the first base station 510, the terminal 500 may apply the configuration information of the V2X communication or SLRB included in the SIB 530 sent by the first base station 510 to the terminal 500. Thereafter, the terminal 500 may move to the coverage 525 of the second base station 520, and may receive the SIB 540 from the second base station 520. At this time, because the terminal 500 is located in the coverage 525 of the second base station 520, the terminal 500 needs to apply the configuration included in the SIB 540 sent by the second base station 520 to the terminal 500. In particular, when the current configuration of the pre-configured V2X communication or SLRB is different from the configuration included in the SIB 540 sent by the second base station 520, an operation error due to the difference needs to be prevented. According to Figure 5 In an embodiment, it is assumed that at the moment of configuring V2X communication or SLRB, the terminal 500 applies the configuration included in the SIB 530 transmitted by the first base station 510, and when the terminal 500 has moved to the coverage 525 of the second base station 520, the preset value is maintained without change for a specific time period (operation 550). When the corresponding configuration is a timer and the timer expires, restarts, resets or stops, the terminal 500 may apply the configuration included in the SIB 540 transmitted by the second base station 520 to the terminal 500. For example, the timer may be one or more of a reordering timer, a reassembly timer and a polling retransmission timer. When the corresponding configuration is a constant value corresponding to a state variable, and the state variable value is reset or changed to an initial value, the terminal 500 may apply the configuration included in the SIB 540 transmitted by the second base station 520 to the terminal 500. For example, the constant value may correspond to at least one of a sequence number length, a maximum retransmission threshold (maxRetxThreshold), a polling PDU (poll PDU) and a polling byte (pollByte) value (operation 560).

[0074] This situation is not limited to V2X terminals, but also applies to terminals in idle mode or inactive mode that do not receive direct configuration from the base station, or to general terminals working in the OOC area. The above configuration method does not need to be applied to the configuration of all V2X communications or the configuration of all SLRBs, and can only be applied to some state variables or some timer values.

[0075] Figure 6 The present invention is a flowchart of an operation of reconfiguring V2X communication or SLRB in a mobility scenario of a terminal of V2X communication according to an embodiment of the present disclosure.

[0076] When the terminal reaches the coverage of the first base station and is able to receive the SIB from the first base station (operation 610), when V2X communication or SLRB and the PDCP device, RLC device, SDAP device and MAC device of the SLRB are configured, the terminal can apply the configuration value included in the configuration of the first base station (operation 620). Thereafter, the terminal moves and reaches the coverage of the second base station and is able to receive the SIB sent by the second base station (operation 630). In this case, when the timer expires, restarts, resets or stops, the preset timer value of the V2X communication or SLRB, and the timer value of the PDCP device, RLC device, SDAP device and MAC device of the SLRB, can be changed to the configuration included in the SIB sent by the second base station. Prior to this, the configuration value based on the configuration of the first base station can be applied without change (operation 640). For example, the timer can be one or more of a reordering timer, a reorganization timer and a polling retransmission timer.

[0077] Figure 7 The present invention is a flowchart of an operation of reconfiguring V2X communication or SLRB in a mobility scenario of a terminal of V2X communication according to an embodiment of the present disclosure.

[0078] When the terminal reaches the coverage of the first base station and is able to receive the SIB from the first base station (operation 710), when V2X communication or SLRB and the PDCP device, RLC device, SDAP device and MAC device of the SLRB are configured, the terminal can apply the configuration value included in the configuration of the first base station (operation 720). Thereafter, the terminal moves and reaches the coverage of the second base station and is able to receive the SIB sent by the second base station (operation 730). In this case, when the constant value corresponding to the state variable configured in the V2X communication or SLRB and the PDCP device, RLC device, SDAP device and MAC device of the SLRB is preset, and the state variable value is reset or changed to the initial value, the configuration included in the SIB sent by the second base station can be applied. Prior to this, the configuration value based on the configuration of the first base station can be applied without change (operation 740). For example, the constant value may correspond to at least one of the sequence number length, the maximum retransmission threshold (maxRetxThreshold), the pollPDU and the pollByte value.

[0079] Figure 8 A method for reconfiguring V2X communication or SLRB in a mobility scenario of a terminal of V2X communication according to an embodiment of the present disclosure is shown.

[0080] The terminal 800 with mobility may deviate from the coverage 815 of the serving base station of the base station 810 to which the terminal 800 belongs, and may move to the coverage 825 of another base station 820, or to an OCC area that is not covered by any base station. When the terminal 800 is in RRC idle mode or inactive mode, the terminal 800 may receive configuration information of the terminal 800 from the SIB received from the base station. Even when the terminal 800 is in connected mode, V2X communication or SLRB may be configured based on the SIB. When the terminal 800 moves to an OOC area that is not covered by any base station, the configuration of V2X communication or SLRB may be applied based on the preconfiguration used in the OCC. However, the time point at which the configuration or preconfiguration is applied when the terminal has moved to the base station, and the information applied may vary according to the implementation.

[0081] according to Figure 8 In an embodiment, the terminal 800 is initially located in the coverage 815 of the first base station (gNB1) 810. When the terminal 800 exists in the coverage 815 of the first base station 810, the terminal 800 may apply the configuration information of the V2X communication or SLRB included in the SIB 830 sent by the first base station 810 to the terminal 800 (operation 850). Thereafter, the terminal 80 may move to the coverage 825 of the second base station 820, and may receive the SIB 840 from the second base station 820. At this time, because the terminal 800 is located in the coverage 825 of the second base station 820, the terminal 800 needs to apply the configuration included in the SIB 840 sent by the second base station 820 to the terminal 800. In particular, when the current configuration of the pre-configured V2X communication or SLRB is different from the configuration included in the SIB 840 sent by the second base station 820, an operation error due to the difference needs to be prevented. According to Figure 8 In an embodiment, it is assumed that at the time point of configuring V2X communication or SLRB, the configuration included in the SIB 830 sent by the first base station 810 is applied, and when the terminal 800 moves to the coverage 825 of the second base station 820, the configuration value of the second base station 820 is immediately applied (operation 860). When the corresponding configuration is a timer, the running timer can be stopped, and the new configuration value can be applied to the timer so that the timer can be restarted. For example, the timer performing the above operation can be one or more of a reordering timer, a reorganization timer, and a polling retransmission timer. When the corresponding configuration is a constant value corresponding to a state variable, the terminal 800 can reset the state variable value or change the state variable value to an initial value, and the new configuration value can be applied immediately. For example, the constant value can correspond to at least one of the maximum retransmission threshold (maxRetxThreshold), pollPDU, and pollByte values.

[0082] This scenario is not limited to V2X terminals, but can also be applied to terminals in idle mode or inactive mode where the terminals do not receive direct configuration from the base station, or can be applied to general terminals working in the OOC area. The above configuration method does not need to be applied to the configuration of all V2X communications or the configuration of all SLRBs, and can be applied only to some state variables or some timer values.

[0083] Fig. 9 The present invention is a flowchart of an operation of reconfiguring V2X communication or SLRB in a mobility scenario of a terminal of V2X communication according to an embodiment of the present disclosure.

[0084] When the terminal reaches the coverage of the first base station and is able to receive SIB from the first base station (operation 910), when V2X communication or SLRB, and PDCP, RLC, SDAP, and MAC devices of the SLRB are configured, the terminal may apply the configuration value included in the configuration of the first base station (operation 920). Thereafter, when the terminal reaches the coverage of the second base station and is able to receive SIB from the second base station (operation 930), the terminal may apply the configuration value included in the configuration of the second base station to change the configuration value of V2X communication or SLRB, and PDCP, RLC, SDAP, and MAC devices of the SLRB (operation 940).

[0085] Fig.10 The present invention is a flowchart of an operation of applying a reconfiguration value of V2X communication or SLRB in a mobility scenario of a terminal of V2X communication according to an embodiment of the present disclosure.

[0086] Due to reasons such as the terminal moving to the coverage of another base station or the OOC area, the terminal with mobility is triggered to apply a new configuration (operation 1010). When there is a running timer, the running timer can be stopped and can be restarted by applying a new configuration value (operation 1020). For example, the timer performing the above operation can be one or more of a reordering timer, a reassembly timer, and a polling retransmission timer. When the corresponding configuration is applied to a constant value corresponding to a state variable, the terminal can reset the state variable value or change the state variable value to an initial value, and can apply a new configuration value (operation 1030). For example, the constant value can correspond to at least one of the maximum retransmission threshold (maxRetxThreshold), pollPDU, and pollByte values.

[0087] Fig.11 The present invention is a flowchart of an operation of applying reconfiguration of the maxRetxThreshold of the SLRB in a mobility scenario of a terminal in V2X communication according to an embodiment of the present disclosure.

[0088] Due to reasons such as the terminal moving to the coverage of another base station or the OOC area, the terminal with mobility is triggered to apply a new configuration. The new configuration may include a change in maxRetxThreshold. When the maxRetxThreshold to be newly applied is less than the existing value, a situation where the RETX_COUNT value is greater than the maxRetxThreshold may occur. For example, the existing configuration value of maxRetxThreshold is 8, and the RETX_COUNT value is 5, but the newly set maxRetxThreshold value may be 4. At this time, a situation where the RETX_COUNT value has exceeded the maxRetxThreshold may occur. In order to prevent this situation, retransmission of the RLC PDU or RLC PDU segment may be considered (operation 1110). At this time, it may be determined whether RETX_COUNT is equal to or greater than maxRetxThreshold (operation 1120). When RETX_COUNT is equal to or greater than maxRetxThreshold, the RLC layer of the terminal may report to the upper layer of the terminal that the maximum retransmission count has been reached (operation 1130). The upper layer may be the RRC layer of the terminal. Thereafter, the RRC layer of the terminal may notify of a radio link failure (RLF) or an RLC failure.

[0089] According to another embodiment, when the configuration value to be applied by the terminal has changed, it can be determined whether the RETX_COUNT value is equal to or greater than the changed maxRetxThreshold (operation 1140). When the RETX_COUNT value is equal to or greater than the maxRetxThreshold, the RLC layer of the terminal can report to the upper layer of the terminal that the maximum retransmission count has been reached (operation 1130). The upper layer can be the RRC layer of the terminal. Thereafter, the RRC layer of the terminal can notify RLF or RLC failure.

[0090] Fig.12 The present invention is a flowchart of a process of applying a reconfiguration value of V2X communication or SLRB in a mobility scenario of a terminal of V2X communication according to an embodiment of the present disclosure.

[0091] Due to reasons such as the terminal moving to the coverage of another base station or the OOC area, the terminal with mobility is triggered to apply a new configuration. The application of the new configuration can be triggered in the sending terminal 1210, or the application of the new configuration can be triggered in the receiving terminal 1220. Fig.12The embodiment shows a case where the application of a new configuration is triggered in the transmitting terminal 1210. When the application of the new configuration is triggered in the transmitting terminal 1210, the transmitting terminal 1210 applies the configuration information of the V2X communication or SLRB included in the SIB or the pre-configuration sent by the base station. The application of the configuration information may refer to the configuration of the transmission parameter value to be applied by the transmitting terminal 1210 (operation 1230). Thereafter, because the parameter configuration of the receiving terminal 1220 may be changed, the transmitting terminal 1210 may send information indicating that the transmission parameter configuration has been changed or that the receiving terminal 1220 needs to change the reception parameter configuration information by sending a configuration transfer message 1240 to the receiving terminal 1220. Thereafter, the receiving terminal 1220 may change the reception parameter configuration based on the transmission configuration transfer message 1240, and may apply the result of the change (operation 1250). The transmission parameter configuration 1230 and the reception parameter configuration 1250 may be referred to above. Figures 3 to 11 This can be achieved by one of the methods described.

[0092] Fig.13 The present invention is a flowchart of a process of applying a reconfiguration value of V2X communication or SLRB in a mobility scenario of a terminal of V2X communication according to an embodiment of the present disclosure.

[0093] Due to reasons such as the terminal moving to the coverage of another base station or the OOC area, the terminal with mobility is triggered to apply a new configuration. The application of the new configuration can be triggered in the sending terminal 1310, or the application of the new configuration can be triggered in the receiving terminal 1320. Fig.13 The embodiment shows a case where the application of a new configuration is triggered in the receiving terminal 1320. When the application of the new configuration is triggered in the receiving terminal 1320, the receiving terminal 1320 applies the configuration information of the V2X communication or SLRB included in the SIB or the pre-configuration sent by the base station. The application of the configuration information may refer to the configuration of the receiving parameter value to be applied by the receiving terminal 1320 (operation 1330). Thereafter, because the parameter configuration of the transmitting terminal 1310 may be changed, the receiving terminal 1320 may send information 1330 indicating that the receiving parameter configuration has changed or that the transmitting terminal 1310 needs to change the transmitting parameter configuration information to the transmitting terminal 1310 via the receiving configuration transfer message 1340. Thereafter, the transmitting terminal 1310 may change the transmitting parameter configuration based on the receiving configuration transfer message 1340, and may apply the result of the change (operation 1350). The receiving parameter configuration 1330 and the transmitting parameter configuration 1350 may be referred to above. Figures 3 to 11 This can be achieved by one of the methods described.

[0094] Fig.14 Different applications of each timer value and constant value applied to the state variable according to an embodiment of the present disclosure are shown.

[0095] The present disclosure proposes a method in which configuration information of V2X communication or SLRB is changed and applied as the terminal moves. The application may be different according to each timer value and the constant value applied to the state variable, and the above reference may be used. Figures 3 to 11 This can be achieved by one of the methods described. Fig.14 An example is shown in which one of four application methods can be used as application of the timer value and the constant value applied to the RLC layer.

[0096] - The first application 1410 is a method that continues to apply the configuration value until the terminal is released, as described above with reference to Figure 3 and Figure 4 According to Fig.14 In the implementation mode, it is assumed that the first application 1410 is applied to set the sn-FieldLength of the sequence number length.

[0097] - The second application 1420 is a method for applying a new configuration value (the configuration of the second base station or the pre-configuration to be used on the OOC) when the timer expires, restarts or stops, and applying the previous configuration (the configuration of the first base station) before that, as described above with reference to Figure 5 and Figure 6 According to Fig.14 In the implementation manner, it is assumed that the second application 1420 is applied to t-PollRetransmit and t-StatusProhibit.

[0098] - The third application 1430 is a method for applying a new configuration value (the configuration of the second base station or the pre-configuration to be used on the OOC) when the state variable value of the application constant value is reset or set to the initial value, and before that, the previous configuration (the configuration of the first base station) is applied, as described above with reference to Figure 5 and Figure 7 According to Fig.14 In the implementation manner, it is assumed that the third application 1430 is applied to pollPDU and pollByte.

[0099] - The fourth application 1440 is a method for applying a new configuration value (configuration of the second base station or preconfiguration to be used on OOC) when the application of the new configuration is triggered, and the previous configuration (configuration of the first base station) is applied before that, as described above with reference to Figures 8 to 11 According to Fig.14 In the implementation mode, it is assumed that the fourth application 1440 is applied to maxRetxThreshold.

[0100] Fig.14The implementation method of the present invention can use different methods to implement the application of each timer value and the constant value applied to the state variable. Specifically, the value to be applied and the application method to be used may vary according to the implementation.

[0101] Fig.15 is a block diagram of a structure of a base station according to an embodiment of the present disclosure.

[0102] refer to Fig.15 , the base station may include a transceiver 1510, a controller 1520, and a memory 1530. The present disclosure is not limited thereto, and the base station may include Fig.15 In addition, the transceiver 1510, the controller 1520, and the memory 1530 may be implemented as a single chip.

[0103] According to an embodiment of the present disclosure, the controller 1520 may include a circuit, an application specific integrated circuit, or at least one processor. The present disclosure is not limited thereto.

[0104] The transceiver 1510 may send a signal to another network entity or receive a signal from another network entity. For example, the transceiver 1510 may send system information to the terminal, and may send a synchronization signal or a reference signal. The signal sent or received between the base station and the network entity may include control information and data. To this end, the transceiver 1510 may include: a radio frequency (RF) transmitter that up-converts and amplifies the signal to be transmitted; and an RF receiver that low-noise amplifies the received signal and down-converts the received signal. However, this is only an embodiment of the transceiver 1510, and the components of the transceiver 1510 are not limited to the RF transmitter and the RF receiver. The transceiver 1510 may receive a signal through a wireless channel and output the signal to the controller 1520, and may send a signal output by the controller 1520 through a wireless channel.

[0105] The memory 1530 may store at least one of the information sent and received by the transceiver 1510 or the information generated by the controller 1520. The memory 1530 may store data and programs required for the terminal operation. In addition, the memory 1530 may store control information or data included in the signal obtained by the terminal. The memory 1530 may include a storage medium such as a read-only memory (ROM), a random access memory (RAM), a hard disk, a compact disc (CD)-ROM and a digital versatile disc (DVD), or a combination thereof. In addition, the memory 1530 may be composed of a plurality of memories.

[0106] According to an embodiment of the present disclosure, the controller 1520 may control all operations of the base station. For example, the controller 1520 may control the signal flow between blocks so as to allow operations to be performed according to the above flowchart. For example, the controller 1520 may determine whether the terminal exists within the coverage of the base station. When it is determined that the terminal exists within the coverage of the base station, the controller 1520 may apply a predetermined configuration value to the terminal. When it is determined that the terminal exists within the coverage of another base station, the controller 1520 may continue to apply the configuration value to the terminal until the terminal is released. Only some operations in the above embodiments are shown, but the present disclosure is not limited thereto. The controller 1520 may control all processes so that the terminal may operate according to all or some of the foregoing embodiments.

[0107] Fig.16 is a block diagram of a structure of a terminal according to an embodiment of the present disclosure.

[0108] refer to Fig.16 , the terminal may include a transceiver 1610, a controller 1620, and a memory 1630. The present disclosure is not limited thereto, and the terminal may include more Fig.16 In addition, the transceiver 1610, the controller 1620, and the memory 1630 may be implemented as a single chip.

[0109] According to an embodiment of the present disclosure, the controller 1620 may include a circuit, an application specific integrated circuit, or at least one processor. The present disclosure is not limited thereto.

[0110] According to an embodiment of the present disclosure, the controller 1620 may control a series of processes so that the terminal may operate according to the above-mentioned embodiments. According to one embodiment, when the terminal is within the coverage of a base station, the controller 1620 may receive a predetermined configuration value from the base station and may apply the received configuration value. When the terminal moves into the coverage of another base station, the controller 1620 may apply the previously received configuration value until the terminal is released. Only some operations in the above-mentioned embodiments are shown, but the present disclosure is not limited thereto. The controller 1620 may control all processes so that the terminal may operate according to all or some of the aforementioned embodiments.

[0111] The transceiver 1610 may send a signal to another network entity or receive a signal from another network entity. For example, the transceiver 1610 may receive system information from a base station, and may receive a synchronization signal or a reference signal. The signal sent or received between the base station and the network entity may include control information and data. To this end, the transceiver 1610 may include: an RF transmitter that up-converts and amplifies the signal to be transmitted; and an RF receiver that low-noise amplifies the received signal and down-converts the received signal. However, this is only an embodiment of the transceiver 1610, and the components of the transceiver 1610 are not limited to the RF transmitter and the RF receiver. The transceiver 1610 may receive a signal through a wireless channel and output the signal to the controller 1620, and may send a signal output by the controller 1620 through a wireless channel.

[0112] The memory 1630 may store at least one of the information sent and received by the transceiver 1610 or the information generated by the controller 1620. The memory 1630 may store data and programs required for the terminal operation. In addition, the memory 1630 may store control information or data included in the signal obtained by the terminal. The memory 1630 may include a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM and a DVD, or a combination thereof. In addition, the memory 1630 may be composed of a plurality of memories.

[0113] Provided are a method and apparatus capable of effectively providing services in a wireless communication system.

[0114] Although the present disclosure has been described in various embodiments, various changes and modifications may occur to those skilled in the art. The present disclosure is intended to encompass such changes and modifications as fall within the scope of the appended claims.

Claims

1. A method for performing sidelink communication performed by a terminal, the method comprising: Applying the first configuration information to the sidelink radio bearer; receiving second configuration information according to movement of the terminal; as well as In case the timer expires, is restarted or stopped, applying the first parameter included in the second configuration information to the sidelink radio bearer; The first parameter is related to the timer.

2. The method of claim 1, further comprising: In case the state variable value is reset or changed to an initial value, applying the second parameter included in the second configuration information to the sidelink radio bearer; The second parameter is a constant value related to the state variable value.

3. The method of claim 2, further comprising: Determine whether the number of retransmissions of one or more RLC PDUs is greater than or equal to the second parameter included in the second configuration information, wherein the second parameter is a maximum retransmission threshold maxRetxThreshold; When the number of retransmissions of the one or more RLC PDUs is greater than or equal to the maxRetxThreshold, report to a higher layer that the number of retransmissions of the one or more RLC PDUs reaches the maxRetxThreshold.

4. The method of claim 1, further comprising: In a case where a service data association protocol SDAP layer, a packet data convergence protocol PDCP layer, a radio link control RLC layer, or a media access control MAC layer is released, the second configuration information is applied to the sidelink radio bearer.

5. The method of claim 4, wherein: The second configuration information includes a configuration associated with a length of a sequence number.

6. The method according to claim 1, in, The timer is at least one of a reordering timer, a reassembly timer, or a polling retransmission timer.

7. The method according to claim 2, in, The state variable value is associated with the polling PDU pollPDU or the polling byte pollByte.

8. The method of claim 1, further comprising sending information to another terminal indicating that the configuration of the sidelink radio bearer has changed.

9. A terminal for performing sidelink communication, the terminal comprising: Transceiver; as well as at least one processor connected to the transceiver and configured to: applying the first configuration information to the sidelink radio bearer, controlling the transceiver to receive second configuration information according to the movement of the terminal, and In case the timer expires, is restarted or stopped, applying the first parameter included in the second configuration information to the sidelink radio bearer; The first parameter is related to the timer.

10. The terminal according to claim 9, wherein: The at least one processor is further configured to: In a case where the state variable value is reset or changed to an initial value, applying the second parameter included in the second configuration information to the sidelink radio bearer; The second parameter is a constant value related to the state variable value. The terminal according to claim 10 , wherein: The at least one processor is further configured to: determining whether the number of retransmissions of one or more RLC PDUs is greater than or equal to the second parameter included in the second configuration information, wherein the second parameter is a maximum retransmission threshold maxRetxThreshold; and When the number of retransmissions of the one or more RLC PDUs is greater than or equal to the maxRetxThreshold, report to a higher layer that the number of retransmissions of the one or more RLC PDUs reaches the maxRetxThreshold.

12. The terminal according to claim 9, wherein: The at least one processor is further configured to: In a case where a service data association protocol SDAP layer, a packet data convergence protocol PDCP layer, a radio link control RLC layer, or a media access control MAC layer is released, the second configuration information is applied to the sidelink radio bearer.

13. The terminal according to claim 12, wherein: The second configuration information includes a configuration associated with a length of a sequence number.

14. The terminal according to claim 9, in, The timer is at least one of a reordering timer, a reassembly timer, or a polling retransmission timer.

15. The terminal according to claim 10, in, The state variable value is associated with the polling PDU poll PDU or the polling byte pollByte.

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