Method and apparatus for performing measurement reporting in a wireless communication system

Abstract

A communication method and system are provided for integrating a 5th generation (5G) communication system for supporting higher data rates than a 4th generation (4G) system with a technology for the Internet of Things (IoT). The present disclosure can be applied to smart services based on 5G communication technology and IoT-related technologies, such as smart homes, smart buildings, smart cities, smart cars, connected cars, healthcare, digital education, smart retail, security and safety services. A method for effectively measuring the strength of a signal in a wireless communication system is provided.

Description

Technical Field

[0001] The present disclosure relates to a method for measuring the strength of a signal in a wireless communication system. More particularly, the present disclosure relates to a method for quickly recovering from a fault by using a timer in a wireless communication system. Background Art

[0002] In order to meet the growing demand for wireless data services since the deployment of the 4th generation (4G) communication system, efforts have been made to develop improved 5th generation (5G) or quasi-5G communication systems. Therefore, 5G or quasi-5G communication systems are also referred to as "super 4G networks" or "post-LTE systems". 5G communication systems are considered to be implemented in higher frequency (mmWave) bands (e.g., 60GHz bands) to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, large-scale multiple input multiple output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and large-scale antenna technology are discussed in 5G communication systems. In addition, in 5G communication systems, development for system network improvements is based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, collaborative communications, coordinated multi-point (CoMP), receiving end interference elimination, etc. and is in progress. In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) as advanced coding modulation (ACM) and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies have been developed.

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

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

[0005] As the advancement of wireless communication systems as described above can provide various services, a scheme for efficiently providing these 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 issues

[0008] The present disclosure provides a method for effectively measuring signal strength in a wireless communication system. In addition, another object of the present invention is to provide a method for quickly performing fault recovery using a timer in a wireless communication system.

[0009] Solution to the problem

[0010] An aspect of the present disclosure provides a method for quickly recovering from a failure by using a timer in a wireless communication system.

[0011] 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.

[0012] According to one aspect of the present disclosure, in the case where a base station transmits a signal strength measurement configuration to a terminal, if a condition of a given configuration is met, the terminal transmits the strength of a serving cell and the strength of a neighboring cell, wherein the strength transmission is not performed for all neighboring cells, but is limited to neighboring cells existing in the frequency of the serving cell for which the serving cell measurement object is configured.

[0013] According to another aspect of the present disclosure, in a case where the terminal has operated the wireless connection signal timer by measuring the strength of the downlink signal, if the switching target cell is found, the timer is replaced by the short timer value configured for the serving cell, and if the switching operation message has not arrived during the interval, the terminal immediately declares failure.

[0014] According to another aspect of the present disclosure, when reporting signal strength measurements in a mobile communication system, the serving cell measurement object is limited to neighboring cells under restricted frequencies, rather than measuring the strength of all possible neighboring cells, thereby reducing the amount of report information generated by sending unnecessary neighboring cell measurement information.

[0015] According to another aspect of the present disclosure, in the case where there is an alternative solution of moving to another cell through a fast failure declaration, the additional serving cell signal strength monitoring time is removed to achieve fast failure recovery.

[0016] 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 annexed drawings, discloses various embodiments of the disclosure.

[0017] Advantageous Effects of the Invention

[0018] Aspects of the present disclosure address at least the above-mentioned problems and / or disadvantages and provide at least the advantages described below.Accordingly, one aspect of the present disclosure provides a method for effectively measuring the strength of a signal in a wireless communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0020] Figure 1A The structure of an LTE system according to an embodiment of the present disclosure is illustrated;

[0021] Figure 1B The wireless protocol structure of the LTE system according to the embodiment of the present disclosure is illustrated;

[0022] Figure 1C illustrates a structure of a next generation mobile communication system according to an embodiment of the present disclosure;

[0023] Figure 1D A wireless protocol structure of a next generation mobile communication system according to an embodiment of the present disclosure is illustrated;

[0024] Figure 1E is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present disclosure;

[0025] Figure 1F is a block diagram illustrating a configuration of an NR base station according to an embodiment of the present disclosure;

[0026] Figure 1G FIG. 4 illustrates a measurement object for each cell according to an embodiment of the present disclosure;

[0027] Figure 1Hillustrates communication with a serving cell according to production of measurement reports according to an embodiment of the present disclosure;

[0028] Fig. 1I The terminal operation for making a measurement report of the terminal according to an embodiment of the present disclosure is illustrated;

[0029] Figure 2A The structure of an LTE system according to an embodiment of the present disclosure is illustrated;

[0030] Figure 2B The wireless protocol structure of the LTE system according to the embodiment of the present disclosure is illustrated;

[0031] Figure 2C illustrates a structure of a next generation mobile communication system according to an embodiment of the present disclosure;

[0032] Figure 2D A wireless protocol structure of a next generation mobile communication system according to an embodiment of the present disclosure is illustrated;

[0033] Figure 2E is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present disclosure;

[0034] Figure 2F is a block diagram illustrating a configuration of an NR base station according to an embodiment of the present disclosure;

[0035] Figure 2G illustrates the expiration of the timer T312 according to an embodiment of the present disclosure;

[0036] Figure 2H FIG. 1 illustrates a case where the timer T312 expires due to the expiration of the timer T310 according to an embodiment of the present disclosure;

[0037] Fig.2I FIG. 4 illustrates a case where a handover message is received before the timer T312 expires according to an embodiment of the present disclosure;

[0038] Figure 2J illustrates a case where the exit condition of an event is satisfied during the operation of the timer T312 according to an embodiment of the present disclosure; and

[0039] Figure 2K The diagram illustrates management when applying for T312 to the SCG according to whether SRB3 is configured when the terminal is configured with MR-DC as one of the other embodiments of the present patent.

[0040] Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures. DETAILED DESCRIPTION

[0041] 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 description includes various specific details to assist in this understanding, but these specific details 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, descriptions of well-known functions and configurations may be omitted for clarity and brevity.

[0042] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are used merely by the inventor 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 illustration purposes only and not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents.

[0043] It should be understood that the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0044] In the following description, for convenience of description, the present disclosure uses terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard. However, the present disclosure is not limited to these terms and names and can be applied to systems conforming to other standards in the same manner.

[0045] The advantages and features of the present disclosure and the ways to achieve them will be apparent by reference to the embodiments described in detail below in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments set forth below, but may be implemented in various different forms. The following embodiments are provided only to fully disclose the present disclosure and inform those skilled in the art of the scope of the present disclosure, and the present disclosure is limited only by the scope of the appended claims. Throughout the specification, the same or similar reference numerals designate the same or similar elements.

[0046] Here, it will be understood that each frame of the flowchart description and the combination of frames in the flowchart description can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device create a component for implementing the function specified in one or more flowchart frames. These computer program instructions can also be stored in a computer-available or computer-readable memory, and these computer program instructions can guide the computer or other programmable data processing device to act in a particular way, so that the instructions stored in the computer-available or computer-readable memory produce an article, which includes an instruction component that implements the function specified in one or more flowchart frames. The computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operations are performed on a computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide operations for implementing the functions specified in one or more flowchart frames.

[0047] Further, each frame in the flowchart diagram can represent a module, segment or part of a code, which includes one or more executable instructions for implementing the logical function (multiple) specified. It should also be noted that in some alternative implementations, the functions mentioned in the frame may not occur in order. For example, depending on the functionality involved, the two frames shown in succession can in fact be executed substantially in parallel, or the frames can sometimes be executed in reverse order.

[0048] As used herein, "unit" refers to a software element or hardware element that performs a predetermined function, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, "unit" does not always have a meaning limited to software or hardware. "Unit" can be constructed to be stored in an addressable storage medium or to execute one or more processors. Therefore, "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processing, functions, properties, processes, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and parameters. The elements and functions provided by "unit" can be combined into a smaller number of elements or a "unit", or divided into a larger number of elements or a "unit". In addition, elements and "units" may be implemented to reproduce one or more CPUs in a device or a secure multimedia card. Further, the "unit" in the embodiment may include one or more processors.

[0049] In the following description of the present disclosure, when a known function or configuration incorporated herein may make the subject matter of the present disclosure rather unclear, a detailed description thereof will be omitted. Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0050] In the following description, for the sake of convenience, terms for identifying access nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, etc. are illustratively used. Therefore, the present disclosure is not limited to the terms used below, and other terms referring to subjects with equivalent technical meanings may be used. For example, in the following description, the term "terminal" may refer to a MAC entity in each terminal for each of the primary cell group (MCG) and the secondary cell group (SCG).

[0051] In the following description, for convenience of description, the present disclosure uses terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard. However, the present disclosure is not limited to these terms and names and can be applied to systems conforming to other standards in the same manner.

[0052] In the following, a base station is a subject configured to perform resource allocation to a terminal, and may be 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. A terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. However, the present disclosure is not limited to the examples described above.

[0053] Specifically, the present disclosure may be applied to 3GPP NR (5th generation mobile communication standard). In addition, the present disclosure may be applied to smart services (e.g., smart homes, smart buildings, smart cities, smart cars or Internet of Vehicles, healthcare, digital education, smart retail, and security and safety services) based on 5G communication technology and IoT-related technologies. In the present disclosure, for the convenience of explanation, eNB may be used together with gNB. That is, the base station described by eNB may indicate gNB. In addition, the term "terminal" may indicate other wireless communication devices as well as mobile phones, NB-IoT devices, and sensors.

[0054] Wireless communication systems have evolved into broadband wireless communication systems that provide high-speed and high-quality packet data services beyond the voice-based services provided at the initial stage (similar to communication standards such as High Speed ​​Packet Access (HSPA), Long Term Evolution (LTE or Evolved Universal Terrestrial Radio Access (E-UTRA)), 3GPP's Advanced LTE (LTE-A) and LTE-Pro, 3GPP2's High Rate Packet Data (HRPD) and Ultra Mobile Broadband (UMB), IEEE's 802.16e, etc.).

[0055] The LTE system, which is a representative example of a broadband wireless communication system, adopts an orthogonal frequency division multiplexing (OFDM) scheme for the downlink (DL) and a single carrier frequency division multiple access (SC-FDMA) scheme for the uplink (UL). The uplink refers to a wireless link for transmitting data or control signals to a base station (eNode B or base station (BS)) by a terminal (user equipment (UE) or mobile station (MS)), and the downlink refers to a wireless link for transmitting data or control signals to a terminal by a base station. In the multiple access scheme described above, the time-frequency resources for carrying data or control information are allocated and managed in a manner to prevent overlap of resources between users (i.e., to establish orthogonality) so as to identify the data or control information of each user.

[0056] Future communication systems after LTE (that is, 5G communication systems) need to freely apply various requirements from users, service providers, etc., and therefore support services that meet all the various requirements. Services considered for 5G communication systems may include enhanced mobile broadband (eMBB), massive machine type communication (mMTC), ultra-reliable low latency communication (URLLC), etc.

[0057] According to part of the embodiment, the purpose of eMBB can be to provide an enhanced data transfer rate higher than the data transfer rate supported by traditional LTE, LTE-A or LTE-Pro. For example, in a 5G communication system, in view of a single base station, eMBB needs to provide a peak data rate of 10Gbps for uplink and a peak data rate of 20Gbps for downlink. In addition, the 5G communication system needs to provide the peak data rate of the terminal and the increased user-perceived data rate. In order to meet the needs described above, the 5G communication system may need to improve various transmission / reception technologies, including further enhanced multiple-input multiple-output (MIMO) transmission technology. In addition, the current LTE uses a maximum transmission bandwidth of 20MHz in the 2GHz frequency band used by LTE for signal transmission, while the 5G communication system uses a frequency bandwidth greater than 20MHz in a frequency band of 3 to 6GHz or a frequency band of 6GHz or higher to meet the data transfer rate required by the 5G communication system.

[0058] Meanwhile, in 5G communication systems, mMTC has been considered to support application services such as the Internet of Things (IoT). In order to effectively provide the Internet of Things, mMTC may need to support large-scale terminal access in the cell, improve terminal coverage, improve battery life, reduce terminal costs, etc. Since the Internet of Things is attached to various sensors and devices to provide communication functions, mMTC is required to support a large number of terminals in the cell (e.g., 1,000,000 terminals / km2). In addition, compared with other services provided in the 5G communication system, terminals supporting mMTC may require a wider coverage range, because due to the nature of mMTC, the terminal is very likely to be placed in a radio shadow area, such as the basement of a building that is not covered by the cell. Terminals supporting mMTC need to be cheap and have a long battery life, such as 10 to 15 years, because the battery of the terminal is difficult to replace frequently.

[0059] Finally, URLLC is a cellular-based wireless communication service used for mission-critical purposes, and services used for remote control of robots or machinery, industrial automation, drones, remote healthcare, emergency alerts, etc. can be considered for URLLC. Therefore, the communication provided by URLLC may need to provide extremely low latency (ultra-low latency) and extremely high reliability (ultra-high reliability). For example, a service supporting URLLC may need to simultaneously meet a radio access delay time (air interface delay) of less than 0.5 milliseconds and a 10 -5 Or a smaller packet error rate. Therefore, for services supporting URLLC, the 5G system may need a design that provides a shorter transmission time interval (TTI) than other services and allocates wide-area resources within the frequency band to ensure the reliability of the communication link.

[0060] The three services described above (that is, eMBB, URLLC, and mMTC) considered for the 5G communication system can be multiplexed and then transmitted in a single system. In order to meet the different needs of the services, different transmission / reception schemes and different transmission / reception parameters can be used for the services, respectively. URLLC, mMTC, and eMBB described above only correspond to examples of different service types, and the service types to which the present disclosure can be applied are not limited to the examples.

[0061] In addition, hereinafter, the embodiments will be described based on the examples of LTE, LTE-A, LTE Pro or 5G (or NR, next generation mobile communication) systems, but the embodiments may also be applied to another communication system with a similar technical background or channel type. Therefore, as determined by those skilled in the art, the embodiments may also be applied to another communication system by partial modification without departing from the scope of the present disclosure.

[0062] Figure 1A The structure of an LTE system according to an embodiment of the present disclosure is illustrated.

[0063] refer to Figure 1A As shown in the figure, the wireless access network of the LTE system may include next generation base stations (evolved node B, hereinafter, ENB, node B or base station) 1a-05, 1a-10, 1a-15 and 1a-20, mobility management entity (MME) 1a-25 and serving gateway (S-GW) 1a-30. User equipment (hereinafter, UE or terminal) 1a-35 can access external networks through ENB 1a-05, 1a-10, 1a-15 and 1a-20 and S-GW 1a-30.

[0064] exist Figure 1A In the LTE system, ENB 1a-05, 1a-10, 1a-15 and 1a-20 may correspond to a conventional Node B in a UMTS system. The ENB may be connected to the UE 1a-35 via a wireless channel and may perform complex functions compared to a conventional Node B. In an LTE system, all user services including real-time services over Internet protocols such as Voice over IP (VoIP) may be served through a shared channel. Therefore, the LTE system may need to be configured as a device that collects information of the UE (including a buffer status, available transmission power status and channel status) and performs scheduling, and the ENB 1a-05 to 1a-20 may be used as the device. A single ENB may typically control multiple cells. For example, an LTE system may use an orthogonal frequency division multiplexing (OFDM) scheme in a bandwidth of, for example, 20 MHz as a wireless access technology in order to implement a transmission rate of 100 Mbps. In addition, the ENB may employ an adaptive modulation and coding (AMC) scheme for determining a modulation scheme and a channel coding rate according to the channel status of the terminal. S-GW 1a-30 may be a device configured to provide a data bearer, and may generate or remove a data bearer according to the control of MME 1a-25. MME is a device configured to perform various control functions and mobility management functions for a terminal, and may be connected to a plurality of base stations.

[0065] Figure 1B A wireless protocol structure of an LTE system according to an embodiment of the present disclosure is illustrated.

[0066] refer to Figure 1B, the wireless protocols of the LTE system may include packet data convergence protocols (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 of the terminal and ENB, respectively. PDCP may be used to perform operations such as compression / reconstruction of IP headers. The main functions of PDCP may be summarized as follows. However, the main functions are not limited to the examples below.

[0067] -Header compression and decompression (ROHC only)

[0068] -Transmission of user data

[0069] - In-order delivery (deliver upper layer PDUs in-order during PDCP re-establishment procedure for RLC AM)

[0070] - Reordering (for split bearers in DC (supports RLC AM only): PDCP PDU routing for transmission and PDCP PDU reordering for reception)

[0071] - Duplicate detection (duplicate detection of lower layer SDUs during PDCP reestablishment process for RLC AM)

[0072] - Retransmission (retransmission of PDCP SDUs during handover and, for split bearers in DC, retransmission of PDCP PDUs during PDCP data recovery procedure for RLC AM)

[0073] -Encryption and decryption

[0074] - Timer-based SDU discard (Timer-based SDU discard in uplink)

[0075] According to part of the embodiment, radio link control (RLC) 1b-10 and 1b-35 can reconfigure PDCP packet data unit (PDU) to have an appropriate size in order to perform ARQ operation, etc. The main functions of RLC can be summarized as follows. However, the main functions are not limited to the examples below.

[0076] -Data transmission (transmission of upper layer PDU)

[0077] -ARQ (error correction through ARQ (only for AM data transmission))

[0078] - Concatenation, segmentation and reassembly (concatenation, segmentation and reassembly of RLC SDU (only for UM and AM data transmission))

[0079] - Re-segmentation (resegmentation of RLC data PDU (only for AM data transmission))

[0080] - Reordering (reordering of RLC data PDUs (only for UM and AM data transmission)

[0081] -Duplicate Detection (Duplicate Detection (for UM and AM data transmission only))

[0082] - Error detection (Protocol error detection (for AM data transmission only))

[0083] -RLC SDU discard (only for UM and AM data transmission)

[0084] -RLC reconstruction

[0085] According to some embodiments, MAC 1b-15 and 1b-30 can be connected to several RLC layer devices configured in a single terminal, can multiplex RLC PDU into MAC PDU, and can demultiplex MAC PDU into RLC PDU. The main functions of MAC can be summarized as follows. However, the main functions are not limited to the examples below.

[0086] - Mapping (mapping between logical channels and transport channels)

[0087] - Multiplexing and demultiplexing (multiplexing / demultiplexing MAC SDUs belonging to one or different logical channels to / from a transport block (TB) delivered to / from the physical layer on a transport channel)

[0088] -Dispatch information report

[0089] -HARQ (error correction through HARQ)

[0090] - Priority handling between logical channels (priority handling between logical channels of a UE)

[0091] - Priority handling between UEs (priority handling between UEs through dynamic scheduling)

[0092] -MBMS service logo

[0093] -Transmission format selection

[0094] -filling

[0095] According to some of the embodiments, the physical layers 1b-20 and 1b-25 may perform channel coding and modulation on the upper layer data to make the data into OFDM symbols and transmit the OFDM symbols through a wireless channel, or may demodulate and channel decode the OFDM symbols received through the wireless channel and then transmit the OFDM symbols to the upper layer. However, the operation is not limited to the following example.

[0096] Figure 1C A structure of a next generation mobile communication system according to an embodiment of the present disclosure is illustrated.

[0097] refer to Figure 1C , a radio access network of a next generation mobile communication system (hereinafter, NR or 2g) may include a next generation base station (new radio node B, hereinafter, NR gNB or NR base station) 1c-10 and a next generation radio core network (new radio core network, NR CN) 1c-05. A next generation radio user equipment (new radio user equipment, NR UE or terminal) 1c-15 may access an external network through the NR gNB 1c-10 and the NR CN 1c-05.

[0098] exist Figure 1C In the present invention, the NR gNB 1c-10 may correspond to an evolved Node B (eNB) of a conventional LTE system. The NR gNB 1c-10 is connected to the NR UE 1c-15 via a wireless channel 1c-20 and may provide excellent services compared to conventional Node Bs. In an NR system, all user services may be served through shared channels. Therefore, the NR system may need to be configured as a device that collects UE status information (such as cache status, available transmission power status, and channel status) and performs scheduling, and the NRgNB 1c-10 may be used as the device. A single NR gNB 1c-10 may typically control multiple cells. In order to implement ultra-high-speed data transmission compared to current LTE, the NR system may adopt a bandwidth greater than or equal to the current maximum bandwidth. In addition, the NR system may use an orthogonal frequency division multiplexing (OFDM) scheme as a wireless access technology and additionally use beamforming technology.

[0099] In addition, according to part of the embodiment, the NR gNB 1c-10 can adopt an adaptive modulation and coding (hereinafter referred to as AMC) scheme to determine the modulation scheme and channel coding rate according to the channel state of the terminal. NR CN 1c-05 can perform functions such as mobility support, bearer configuration and QoS configuration. NR CN 1c-05 is a device configured to perform various control functions and mobility management functions for the terminal, and can be connected to multiple base stations. In addition, the NR system can be linked to the traditional LTE system, and the NR CN 1c-05 is connected to the MME 1c-25 through a network interface. The MME 1c-25 can be connected to the eNB 1c-30 which is an existing base station.

[0100] Figure 1D A wireless protocol structure of a next generation mobile communication system according to an embodiment of the present disclosure is illustrated.

[0101] refer to Figure 1DThe wireless protocols of the next generation mobile communication system may include NR Service Data Adaptation Protocol (SDAP) 1d-01 and 1d-45, NR PDCP 1d-05 and 1d-40, NR RLC 1d-10 and 1d-35, and NRMAC 1d-15 and 1d-30 of the terminal and NR base station, respectively.

[0102] According to the part of the embodiment, the main functions of NR SDAP 1d-01 and 1d-45 may include part of the functions below. However, the functions are not limited to the examples below.

[0103] -Transmission of user data (transmission of user plane data)

[0104] - Mapping between QoS flows and data bearers (DRBs) for both downlink (DL) and uplink (UL)

[0105] - Mark QoS Flow ID in DL and UL (Mark QoS Flow ID in both DL and UL packets)

[0106] - Mapping of Reflective QoS flows to data bearers for UL SDAP PDUs (Reflective QoS flows to DRB mapping for UL SDAPPDUs)

[0107] Regarding the SDAP layer device, the terminal may receive configuration related to whether to use the function of the SDAP layer device or whether to use the header of the SDAP layer device for each PDCP layer device, each bearer, or each logical channel through a radio resource control (RRC) message. In addition, if the SDAP header is configured, the SDAP layer device may guide the terminal to update or reconfigure the mapping information related to the QoS flow and data bearer for the uplink and downlink through the non-access layer (NAS) quality of service (QoS) reflection configuration 1-bit indicator (NAS reflection QoS) and the access layer (AS) QoS reflection configuration 1-bit indicator (AS reflection QoS) of the SDAP header. According to part of the embodiment, the SDAP header may include QoS flow ID information indicating QoS. According to part of the embodiment, the QoS information may be used as data processing priority, scheduling information, etc. to support smooth services.

[0108] According to some embodiments, the main functions of NR PDCP 1d-05 and 1d-40 may include some of the functions below. However, the functions are not limited to the examples below.

[0109] -Header compression and decompression (ROHC only)

[0110] -Transmission of user data

[0111] - In-order delivery (deliver upper layer PDU in order)

[0112] - Out-of-order delivery (deliver upper layer PDU out of order)

[0113] - Reordering (PDCP PDU reordering for reception)

[0114] - Duplicate detection (duplicate detection of lower layer SDU)

[0115] -Retransmission (retransmission of PDCP SDU)

[0116] -Encryption and decryption

[0117] - Timer-based SDU discard (Timer-based SDU discard in uplink)

[0118] In the above description, the reordering function of the NR PDCP device may mean reordering the PDCP PDUs received from the lower layer according to an order based on the PDCP sequence number (SN). The reordering function of the NR PDCP device may include a function of transmitting data to the upper layer according to the rearranged order, or may include a function of directly transmitting data without considering the order, may include a function of rearranging the order to record the lost PDCP PDU, may include a function of reporting the status of the lost PDCP PDU to the transmission side, and may include a function of requesting retransmission of the lost PDCP PDU.

[0119] According to part of the embodiment, the main functions of NR RLC 1d-10 and 1d-35 may include part of the functions below. However, the functions are not limited to the examples below.

[0120] -Data transmission (transmission of upper layer PDU)

[0121] - In-order delivery (deliver upper layer PDU in order)

[0122] - Out-of-order delivery (deliver upper layer PDU out of order)

[0123] -ARQ (error correction through ARQ)

[0124] - Concatenation, segmentation and reassembly (concatenation, segmentation and reassembly of RLC SDU)

[0125] - Re-segmentation (resegmentation of RLC data PDU)

[0126] - Reordering (reordering of RLC data PDUs)

[0127] - Duplicate detection

[0128] - Error detection (protocol error detection)

[0129] -RLC SDU discarded

[0130] -RLC reconstruction

[0131] In the above description, the in-order delivery function of the NR RLC device may mean a function of transmitting the RLC SDU received from the lower layer to the upper layer according to the sequence. The in-order delivery function of the NR RLC device may include the following functions: if a single RLC SDU is divided into several RLC SDUs and then the RLC SDUs are received, then the several RLC SDUs are reassembled and the reassembled RLC SDU is sent.

[0132] The in-order delivery function of the NR RLC device may include a function of rearranging the received RLC PDU with reference to the RLC sequence number (SN) or the PDCP sequence number (SN), may include a function of rearranging the order to record the lost RLC PDU, may include a function of reporting the status of the lost RLC PDU to the transmission side, and may include a function of requesting retransmission of the lost RLC PDU.

[0133] The in-order delivery function of the NR RLC device may include the following function: if there is a lost RLC SDU, then only the RLC SDU before the lost RLC SDU is delivered to the upper layer according to the sequence.

[0134] The in-order delivery function of the NR RLC device may include the following function: despite the presence of lost RLC SDUs, if a predetermined timer expires, all RLC SDUs received before the timer has started are delivered to the upper layer in sequence.

[0135] The in-order delivery function of the NR RLC device may include the following function: despite the presence of lost RLC SDUs, if a predetermined timer expires, all RLC SDUs received until the current time point are delivered to the upper layer in sequence.

[0136] The NR RLC device can process the RLC PDU according to the order in which the RLC PDU has been received, regardless of the order based on the sequence number (out-of-order delivery), and transmit the processed RLC PDU to the NR PDCP device.

[0137] In the case of segment reception by the NR RLC device, the NR RLC device can receive segments that have been stored in the buffer or will be received later, reconfigure the segments into a single complete RLC PDU, and transmit the RLC PDU to the NR PDCP device.

[0138] The NR RLC layer may not include the cascading function and may perform the function in the NR MAC layer, or the cascading function may be replaced by a multiplexing function of the NR MAC layer.

[0139] In the above description, the out-of-order delivery function of the NR RLC device may mean a function of directly delivering the RLC SDU received from the lower layer to the upper layer regardless of the order. The out-of-order delivery function of the NR RLC device may include the following functions: if a single RLC SDU is divided into several RLC SDUs and then the RLC SDUs are received, reassemble the several RLC SDUs and send the reassembled RLC SDUs. The out-of-order delivery function of the NR RLC device may include a function of storing the RLC SN or PDCP SN of the received RLC PDU and sequencing the RLC PDU to record the lost RLC PDU.

[0140] According to part of the embodiment, NR MAC 1d-15 and 1d-30 may be connected to several NR RLC layer devices configured in a single terminal, and the main functions of NR MAC may include part of the functions below. However, the functions are not limited to the examples below.

[0141] - Mapping (mapping between logical channels and transport channels)

[0142] -Multiplexing and demultiplexing (multiplexing / demultiplexing of MAC SDU)

[0143] -Dispatch information report

[0144] -HARQ (error correction through HARQ)

[0145] - Priority handling between logical channels (priority handling between logical channels of a UE)

[0146] - Priority handling between UEs (priority handling between UEs through dynamic scheduling)

[0147] -MBMS service logo

[0148] -Transmission format selection

[0149] -filling

[0150] According to part of the embodiment, the NR physical layers 1d-20 and 1d-25 can perform channel coding and modulation on the upper layer data to make the data into OFDM symbols and send the OFDM symbols through the wireless channel, or can demodulate and channel decode the OFDM symbols received through the wireless channel, and then transmit the OFDM symbols to the upper layer.

[0151] Figure 1Eis a block diagram illustrating an internal structure of a terminal according to an embodiment of the present disclosure.

[0152] refer to Figure 1E The terminal may include a radio frequency (RF) processor 1e-10, a baseband processor 1e-20, a storage unit 1e-30, and a controller 1e-40. However, the present disclosure is not limited to the examples described above and is not limited to Figure 1E The terminal may include fewer or greater numbers of elements than those illustrated in FIG.

[0153] The RF processor 1e-10 can perform functions such as signal band changing, amplification, etc. for sending or receiving signals through a wireless channel. That is, the RF processor 1e-10 can up-convert the baseband signal provided by the baseband processor 1e-20 into an RF band signal, and then send the RF band signal through the antenna 1e-50, and can down-convert the RF band signal received through the antenna 1e-50 into a baseband signal. For example, the RF processor 1e-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), etc. The present disclosure is not limited to the examples described above. Figure 1E In the figure, only one antenna 1e-50 is illustrated, but the terminal may include multiple antennas. In addition, the RF processor 1e-10 may include multiple RF chains. In addition, the RF processor 1e-10 may perform beamforming. In order to perform beamforming, the RF processor 1e-10 may adjust the phase and size of each of the signals sent or received through multiple antennas or antenna elements. In addition, the RF processor 1e-10 may perform multiple-input multiple-output (MIMO) and may receive several layers when performing MIMO operation.

[0154] The baseband processor 1e-20 performs the conversion function between the baseband signal and the bit stream according to the physical layer protocol of the system. For example, when sending data, the baseband processor 1e-20 generates complex symbols by encoding and modulating the transmission bit stream. In addition, when receiving data, the baseband processor 1e-20 reconstructs the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 1e-10. For example, in the case of applying an orthogonal frequency division multiplexing (OFDM) scheme, when sending data, the baseband processor 1e-20 generates complex symbols by encoding and modulating the transmission bit stream, maps the complex symbols to subcarriers, and then configures OFDM symbols by inverse fast Fourier transform (IFFT) calculation and cyclic prefix (CP) insertion. In addition, when receiving data, the baseband processor 1e-20 can divide the baseband signal provided from the RF processor 1e-10 into units of OFDM symbols, reconstruct the signal mapped to the subcarrier by fast Fourier transform (FFT), and then reconstruct the received bit stream by demodulation and decoding.

[0155] The baseband processor 1e-20 and the RF processor 1e-10 transmit and receive signals as described above. The baseband processor 1e-20 and the RF processor 1e-10 may be referred to as a transmitter, a receiver, a transceiver, or a communication unit. In addition, at least one of the baseband processor 1e-20 and the RF processor 1e-10 may include multiple communication modules to support a variety of different wireless access technologies. In addition, at least one of the baseband processor 1e-20 and the RF processor 1e-10 may include different communication modules to process signals in different frequency bands. For example, different wireless access technologies may include wireless LAN (e.g., IEEE802.11), cellular networks (e.g., LTE), etc. In addition, different frequency bands may include ultra-high frequency (SHF) (e.g., 2.NHz and NGHz) bands, millimeter (mm) waves (e.g., 60GHz) bands, etc. The terminal may send or receive signals to or from a base station using the baseband processor 1e-20 and the RF processor 1e-10, and the signal may include control information and data.

[0156] The storage unit 1e-30 stores data such as basic programs, applications, and configuration information for the operation of the terminal. Specifically, the storage unit 1e-30 can store information related to a second access node that performs wireless communication by using a second radio access technology. The storage unit 1e-30 provides the stored data in response to a request from the controller 1e-40. The storage unit 1e-30 may include a storage medium (such as ROM, RAM, hard disk, CD-ROM, and DVD) or a combination of storage media. In addition, the storage unit 1e-30 may include multiple memories.

[0157] The controller 1e-40 controls the overall operation of the terminal. For example, the controller 1e-40 sends or receives a signal through the baseband processor 1e-20 and the RF processor 1e-10. In addition, the controller 1e-40 records data in the storage unit 1e-30 and reads data from the storage unit 1e-30. To this end, the controller 1e-40 may include at least one processor 1e-42. For example, the controller 1e-40 may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls a higher layer (such as an application). In addition, at least one element in the terminal may be implemented as a single chip.

[0158] Figure 1F is a block diagram illustrating the configuration of an NR base station according to an embodiment of the present disclosure.

[0159] refer to Figure 1F , the base station may include a radio frequency (RF) processor 1f-10, a baseband processor 1f-20, a backhaul communication unit 1f-30, a storage unit 1f-40, and a controller 1f-50. However, the present disclosure is not limited to the examples described above, and Figure 1F The base station may include fewer or greater numbers of elements than those illustrated in FIG.

[0160] The RF processor 1f-10 can perform functions such as signal band changing, amplification, etc. for sending or receiving signals through a wireless channel. That is, the RF processor 1f-10 can up-convert the baseband signal provided from the baseband processor 1f-20 into an RF band signal, and then send the RF band signal through the antenna 1f-60, and can down-convert the RF band signal received through the antenna 1f-60 into a baseband signal. For example, the RF processor 1f-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. Figure 1F In the figure, only one antenna 1f-60 is illustrated, but the RF processor 1f-10 may include multiple antennas. In addition, the RF processor 1f-10 may include multiple RF chains. In addition, the RF processor 1f-10 can perform beamforming. In order to perform beamforming, the RF processor 1f-10 can adjust the phase and size of each of the signals sent or received through multiple antennas or antenna elements. The RF processor can perform downlink MIMO operations by transmitting at least one layer.

[0161] The baseband processor 1f-20 performs a conversion function between a baseband signal and a bit stream according to the physical layer protocol of the first wireless access technology. For example, when sending data, the baseband processor 1f-20 generates complex symbols by encoding and modulating the transmitted bit stream. In addition, when receiving data, the baseband processor 1f-20 reconstructs the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 1f-10. For example, in the case of applying the OFDM scheme, when sending data, the baseband processor 1f-20 generates complex symbols by encoding and modulating the transmitted bit stream, maps the complex symbols to subcarriers, and then configures the OFDM symbols through IFFT calculation and CP insertion. In addition, when receiving data, the baseband processor 1f-20 can divide the baseband signal provided by the RF processor 1f-10 into units of OFDM symbols, reconstruct the signal mapped to the subcarriers through FFT, and then reconstruct the received bit stream through demodulation and decoding. The baseband processor 1f-20 and the RF processor 1f-10 can send and receive signals as described above. Therefore, the baseband processor 1f-20 and the RF processor 1f-10 can be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit. The base station can send or receive signals to or from the terminal by using the baseband processor 1f-20 and the RF processor 1f-10, and the signals may include control information and data.

[0162] The backhaul communication unit 1f-30 provides an interface for performing communication with other nodes within the network. That is, the backhaul communication unit 1f-30 can convert a bit stream sent from the main base station to another node (e.g., an auxiliary base station, a core network, etc.) into a physical signal, and can convert a physical signal received from another node into a bit stream. The backhaul communication unit 1f-30 can be included in the communication unit.

[0163] The storage unit 1f-40 stores data such as basic programs, applications, and configuration information for the operation of the base station. The storage unit 1f-40 may store information related to the bearer assigned to the connection terminal, measurement results reported from the connection terminal, and the like. In addition, the storage unit 1f-40 may store information used as a determination criterion for whether to provide or stop providing multiple connections to the terminal. The storage unit 1f-40 provides the stored data in response to a request from the controller 1f-50. The storage unit 1f-40 may include a storage medium (such as ROM, RAM, hard disk, CD-ROM, and DVD) or a combination of storage media. In addition, the storage unit 1f-40 may include multiple memories. According to part of the embodiment, the storage unit 1f-40 may store a program for executing the buffer status reporting method according to the present disclosure.

[0164] The controller 1f-50 controls the overall operation of the base station. For example, the controller 1f-50 sends or receives a signal through the baseband processor 1f-20 and the RF processor 1f-10 or the backhaul communication unit 1f-30. In addition, the controller 1f-50 records data in the storage unit 1f-40 and reads data from the storage unit 1f-40. To this end, the controller 1f-50 may include at least one processor 1f-52. In addition, at least one element in the base station may be implemented as a single chip.

[0165] Figure 1G A measurement object for each cell according to an embodiment of the present disclosure is illustrated.

[0166] Cells in LTE can be distinguished by center frequency and bandwidth, and specifically, since the center frequency of each carrier is defined, the absolute radio frequency channel number (ARFCN) information based on the center frequency can be used as the measurement object for strength measurement of the corresponding signal. That is, the center frequency and the cell are mapped one-to-one. However, in NR, regardless of the center frequency of the bandwidth applicable to the cell, multiple measurable frequency bands defined in the cell may exist, such as Figure 1G As shown in the figure.

[0167] refer to Figure 1G , the frequency zone indicated by synchronization signal blocks (SSBs) 1 and 2 in cell A may mean a frequency zone in which SSB 1 or SSB 2 is transmitted as a reference signal for cell signal strength measurement. In addition, CSI-RS 1, 2, and 3 mean a frequency zone in which CSI-RS 1, 2, and 3 are transmitted as reference signals for cell signal strength measurement. Cell A includes multiple reference signal transmission zones for cell signal strength measurement, and therefore measurement objects for radio resource management (RRM) may be configured for one or more of the multiple reference signal transmission zones. In NR, for the purpose of serving cell signal strength measurement, only one measurement object among the multiple reference signal transmission zones may be specified and defined as servingcellMO. For RRM, only the frequency zone designated as serving cell MO may be subject to serving cell signal strength measurement.

[0168] Figure 1H Communication with a serving cell according to fabrication of a measurement report according to an embodiment of the present disclosure is illustrated.

[0169] Terminal 1h-1 is connected to serving cell 1h-5 (1h-10). Serving cell 1h-5 may configure reportAddNeighMeas in reportConfig associated with a specific measID in the measurement configuration, and may transmit the measurement configuration to terminal 1h-1 (1h-20). Terminal 1h-1 that receives the measurement configuration performs measurement in a given measID, and in the case of performing measurement by using a measurement object (MO) and reportConfig associated with each measID, if the measurement report trigger condition is met (1h-25), the terminal places the serving cell measurement result in a measurement report (1h-30), and sends the measurement report to serving cell 1h-5 (1h-35). If reportAddNeighMeas is configured in operation 1h-20 and the terminal receives reportAddNeighMeas, the terminal also includes the result of the best neighboring cell among the neighboring cells and the serving cell result in the measurement report. The serving cell result may include the measurement result of the serving cell configured with servingCellMO. In addition, as a neighboring cell result, the following operation can be performed on the NR frequency of the serving cell configured with servingCellMO or the NR service frequency of the serving cell configured with servingCellMO among the frequencies other than the frequency corresponding to the measID that triggers the MR.

[0170] If the measResultBestNeighCell value is placed in the measResultServingMOList in the MR, then the available measurement quantity and physCellId of the best non-serving cell are placed. The measurement quantity is measured based on the reportQuantityCell and the rsType indicated in the reportConfig associated with the measObjectNR indicated by the servingCellMO. In addition, if RSRP measurement is configured in the reportConfig associated with the measObjectNR, then the best non-serving cell can be the cell with the highest RSRP, if RSRQ measurement is configured, then the best non-serving cell can be the cell with the highest RSRQ, or the best non-serving cell can be the cell with the highest SINR.

[0171] Each NR serving frequency configured with servingCellMO for the serving cell, except the frequency corresponding to the measId that triggered the measurement report;

[0172] the UE sets measResultBestNeighCell in measResultServingMOList to include the physCellId and the available measurement quantity of the best non-serving cell, based on reportQuantityCell and rsType indicated in reportConfig corresponding to measObjectNR indicated by servingCellMO, wherein if RSRP measurement results are available for the cell corresponding to the measObjectNR, then the best non-serving cell corresponds to the highest measured RSRP, otherwise if RSRQ measurement results are available for the cell corresponding to the measObjectNR, then the best non-serving cell corresponds to the highest measured RSRQ, otherwise the best non-serving cell corresponds to the highest measured SINR;

[0173] According to another embodiment, the serving frequency in the example may be replaced by a frequency or a cell as described below.

[0174] Each NR serving frequency configured with servingCellMO for the serving cell, except the frequency corresponding to the measId that triggered the measurement report;

[0175] the UE sets measResultBestNeighCell in measResultServingMOList to include the physCellId and the available measurement quantity of the best non-serving cell, based on reportQuantityCell and rsType indicated in reportConfig corresponding to measObjectNR indicated by servingCellMO, wherein if RSRP measurement results are available for the cell corresponding to the measObjectNR, then the best non-serving cell corresponds to the highest measured RSRP, otherwise if RSRQ measurement results are available for the cell corresponding to the measObjectNR, then the best non-serving cell corresponds to the highest measured RSRQ, otherwise the best non-serving cell corresponds to the highest measured SINR;

[0176] Fig. 1I The diagram illustrates terminal operations for making a measurement report of the terminal according to an embodiment of the present disclosure.

[0177] After the terminal receives the measurement configuration from the serving cell, the terminal can start measuring the MO corresponding to the given configuration (1i-1). The terminal can measure the MO configured as measID among the given measID to determine whether the event given in the reportConfig associated with the measID is satisfied (1i-5). If the terminal measures the MO configured as measID among the given measID and the event given in the reportConfig associated with the measID is satisfied, the terminal can determine whether reportAddNeighMeas that meets the corresponding conditions is configured in the reportConfig (1i-10). If reportAddNeighMeas is configured in the reportConfig, the terminal can include the measurement result value of the best non-serving cell in the MR for the NR (serving) frequency of the serving cell configured with servingCellMO, refer to Figure 1H Description (1i-15). In addition, the MR may also include the measurement result value of the NR serving cell configured with servingCellMO (1i-20). If reportAddNeighMeas is not configured in the reportConfig of the triggering event, the terminal may only include the measurement result value of the NR serving cell configured with servingCellMO in the MR (1i-20), and then transmit the MR to the serving base station (1i-25).

[0178] Figure 2A The structure of an LTE system according to an embodiment of the present disclosure is illustrated.

[0179] refer to Figure 2A As shown in the figure, the wireless access network of the LTE system may include next generation base stations (evolved node B, hereinafter, ENB, node B or base station) 2a-05, 2a-10, 2a-15 and 2a-20, mobility management entity (MME) 2a-25 and serving gateway (S-GW) 2a-30. User equipment (hereinafter, UE or terminal) 2a-35 can access external networks through ENB 2a-05, 2a-10, 2a-15 and 2a-20 and S-GW 2a-30.

[0180] exist Figure 2AIn the LTE system, ENB 2a-05, 2a-10, 2a-15 and 2a-20 may correspond to a conventional Node B in a UMTS system. The ENB may be connected to the UE 2a-35 via a wireless channel and may perform complex functions compared to a conventional Node B. In an LTE system, all user services including real-time services over Internet protocols (such as Voice over IP (VoIP)) may be served through a shared channel. Therefore, the LTE system may need to be configured to collect status information of the UE (such as a buffer status, available transmission power status, and channel status) and perform scheduling, and the ENB 2a-05 to 2a-20 may be used as the device. A single ENB may typically control multiple cells. For example, an LTE system may use an orthogonal frequency division multiplexing (OFDM) scheme in a bandwidth of, for example, 20 MHz as a wireless access technology in order to implement a transmission rate of 100 Mbps. In addition, the ENB may employ an adaptive modulation and coding (AMC) scheme for determining a modulation scheme and a channel coding rate according to the channel status of the terminal. The S-GW 2a-30 may be a device configured to provide a data bearer, and may generate or remove a data bearer according to the control of the MME 2a-25. The MME is a device configured to perform various control functions and mobility management functions for a terminal, and may be connected to a plurality of base stations.

[0181] Figure 2B A wireless protocol structure of an LTE system according to an embodiment of the present disclosure is illustrated.

[0182] refer to Figure 2B , the wireless protocols of the LTE system may include packet data convergence protocols (PDCP) 2b-05 and 2b-40 of the terminal and ENB, radio link control (RLC) 2b-10 and 2b-35, and medium access control (MAC) 2b-15 and 2b-30. PDCP may be used to perform operations such as compression / reconstruction of IP headers. The main functions of PDCP may be summarized as follows. However, the main functions are not limited to the examples below.

[0183] -Header compression and decompression (ROHC only)

[0184] -Transmission of user data

[0185] - In-order delivery (deliver upper layer PDUs in-order during PDCP re-establishment procedure for RLC AM)

[0186] - Reordering (for split bearers in DC (supports RLC AM only): PDCP PDU routing for transmission and PDCP PDU reordering for reception)

[0187] - Duplicate detection (duplicate detection of lower layer SDUs during PDCP reestablishment process for RLC AM)

[0188] - Retransmission (retransmission of PDCP SDUs during handover and, for split bearers in DC, retransmission of PDCP PDUs during PDCP data recovery procedure for RLC AM)

[0189] -Encryption and decryption

[0190] - Timer-based SDU discard (Timer-based SDU discard in uplink)

[0191] According to part of the embodiment, the radio link control (RLC) 2b-10 and 2b-35 can reconfigure the PDCP packet data unit (PDU) to have an appropriate size in order to perform ARQ operations, etc. The main functions of the RLC can be summarized as follows. However, the main functions are not limited to the examples below.

[0192] -Data transmission (transmission of upper layer PDU)

[0193] -ARQ (error correction through ARQ (only for AM data transmission))

[0194] - Concatenation, segmentation and reassembly (concatenation, segmentation and reassembly of RLC SDU (only for UM and AM data transmission))

[0195] - Re-segmentation (resegmentation of RLC data PDU (only for AM data transmission))

[0196] - Reordering (reordering of RLC data PDUs (only for UM and AM data transmission)

[0197] -Duplicate Detection (Duplicate Detection (for UM and AM data transmission only))

[0198] - Error detection (Protocol error detection (for AM data transmission only))

[0199] -RLC SDU discard (only for UM and AM data transmission)

[0200] -RLC reconstruction

[0201] According to some embodiments, MAC 2b-15 and 2b-30 can be connected to several RLC layer devices configured in a single terminal, can multiplex RLC PDU into MAC PDU, and can demultiplex MAC PDU into RLC PDU. The main functions of MAC can be summarized as follows. However, the functions are not limited to the examples below.

[0202] - Mapping (mapping between logical channels and transport channels)

[0203] - Multiplexing and demultiplexing (multiplexing / demultiplexing MAC SDUs belonging to one or different logical channels to / from a transport block (TB) delivered to / from the physical layer on a transport channel)

[0204] -Dispatch information report

[0205] -HARQ (error correction through HARQ)

[0206] - Priority handling between logical channels (priority handling between logical channels of a UE)

[0207] - Priority handling between UEs (priority handling between UEs through dynamic scheduling)

[0208] -MBMS service logo

[0209] -Transmission format selection

[0210] -filling

[0211] According to some embodiments, the physical layers 2b-20 and 2b-25 may perform channel coding and modulation on the upper layer data to make the data into OFDM symbols and transmit the OFDM symbols through a wireless channel, or may demodulate and channel decode the OFDM symbols received through the wireless channel and then transmit the OFDM symbols to the upper layer. However, the present disclosure is not limited to the following examples.

[0212] Figure 2C A structure of a next generation mobile communication system according to an embodiment of the present disclosure is illustrated.

[0213] refer to Figure 2C , the radio access network of the next generation mobile communication system (hereinafter, NR or 2g) may include a next generation base station (new radio node B, hereinafter, NR gNB or NR base station) 2c-10 and a next generation radio core network (new radio core network, NR CN) 2c-05. The next generation radio user equipment (new radio user equipment, NR UE or terminal) 2c-15 may access an external network through the NR gNB 2c-10 and the NR CN 2c-05.

[0214] exist Figure 2CIn the present invention, the NR gNB 2c-10 may correspond to an evolved Node B (eNB) of a conventional LTE system. The NR gNB 2c-10 is connected to the NR UE 2c-15 via a wireless channel 2c-20 and may provide excellent services compared to conventional Node Bs. In an NR system, all user services may be served through a shared channel. Therefore, the NR system may need to be configured as a device that collects UE status information (such as cache status, available transmission power status, and channel status) and performs scheduling, and the NRgNB 2c-10 may be used as the device. A single NR gNB 2c-10 may typically control multiple cells. In order to implement ultra-high-speed data transmission compared to current LTE, the NR system may adopt a bandwidth greater than or equal to the current maximum bandwidth. In addition, the NR system may use an orthogonal frequency division multiplexing (OFDM) scheme as a wireless access technology and additionally use beamforming technology.

[0215] In addition, according to part of the embodiment, the NR gNB 2c-10 can adopt an adaptive modulation and coding (hereinafter referred to as AMC) scheme to determine the modulation scheme and channel coding rate according to the channel state of the terminal. NR CN 2c-05 can perform functions such as mobility support, bearer configuration and QoS configuration. NR CN 2c-05 is a device configured to perform various control functions and mobility management functions for the terminal, and can be connected to multiple base stations. In addition, the NR system can be linked to the traditional LTE system, and the NR CN is connected to the MME 2c-25 through a network interface. The MME can be connected to the eNB 2c-30 which is an existing base station.

[0216] Figure 2D A wireless protocol structure of a next generation mobile communication system according to an embodiment of the present disclosure is illustrated.

[0217] refer to Figure 2D , the wireless protocols of the next generation mobile communication system may include NR Service Data Adaptation Protocol (SDAP) 2d-01 and 2d-45, NR PDCP 2d-05 and 2d-40, NR RLC 2d-10 and 2d-35, and NRMAC 2d-15 and 2d-30 of the terminal and NR base station, respectively.

[0218] According to the part of the embodiment, the main functions of NR SDAP 2d-01 and 2d-45 may include part of the functions below. However, the functions are not limited to the examples below.

[0219] -Transmission of user data (transmission of user plane data)

[0220] - Mapping between QoS flows and data bearers (DRBs) for both downlink (DL) and uplink (UL)

[0221] - Mark QoS Flow ID in DL and UL (Mark QoS Flow ID in both DL and UL packets)

[0222] - Mapping of Reflective QoS flows to data bearers on UL SDAP PDUs (Reflective QoS flows to DRB mapping for UL SDAPPDUs)

[0223] Regarding the SDAP layer device, the terminal may receive configuration related to whether to use the function of the SDAP layer device or whether to use the header of the SDAP layer device for each PDCP layer device, each bearer, or each logical channel through a radio resource control (RRC) message. In addition, if the SDAP header is configured, the SDAP layer device may guide the terminal to update or reconfigure the mapping information related to the QoS flow and data bearer for the uplink and downlink through the non-access layer (NAS) quality of service (QoS) reflection configuration 1-bit indicator (NAS reflection QoS) and the access layer (AS) QoS reflection configuration 1-bit indicator (AS reflection QoS) of the SDAP header. According to part of the embodiment, the SDAP header may include QoS flow ID information indicating QoS. According to part of the embodiment, the QoS information may be used as data processing priority, scheduling information, etc. to support smooth services.

[0224] According to some embodiments, the main functions of NR PDCP 2d-05 and 2d-40 may include some of the functions below. However, the functions are not limited to the examples below.

[0225] -Header compression and decompression (ROHC only)

[0226] -Transmission of user data

[0227] - In-order delivery (deliver upper layer PDU in order)

[0228] - Out-of-order delivery (deliver upper layer PDU out of order)

[0229] - Reordering (PDCP PDU reordering for reception)

[0230] - Duplicate detection (duplicate detection of lower layer SDU)

[0231] -Retransmission (retransmission of PDCP SDU)

[0232] -Encryption and decryption

[0233] - Timer-based SDU discard (Timer-based SDU discard in uplink)

[0234] In the above description, the reordering function of the NR PDCP device may mean reordering the PDCP PDUs received from the lower layer according to an order based on the PDCP sequence number (SN). The reordering function of the NR PDCP device may include a function of transmitting data to the upper layer according to the rearranged order, or may include a function of directly transmitting data without considering the order, may include a function of rearranging the order to record the lost PDCP PDU, may include a function of reporting the status of the lost PDCP PDU to the transmission side, and may include a function of requesting retransmission of the lost PDCP PDU.

[0235] According to some embodiments, the main functions of NR RLC 2d-10 and 2d-35 may include some of the functions below. However, the functions are not limited to the examples below.

[0236] -Data transmission (transmission of upper layer PDU)

[0237] - In-order delivery (deliver upper layer PDU in order)

[0238] - Out-of-order delivery (deliver upper layer PDU out of order)

[0239] -ARQ (error correction through ARQ)

[0240] - Concatenation, segmentation and reassembly (concatenation, segmentation and reassembly of RLC SDU)

[0241] - Re-segmentation (resegmentation of RLC data PDU)

[0242] - Reordering (reordering of RLC data PDUs)

[0243] - Duplicate detection

[0244] - Error detection (protocol error detection)

[0245] -RLC SDU discarded

[0246] -RLC reconstruction

[0247] In the above description, the in-order delivery function of the NR RLC device may mean a function of transmitting the RLC SDU received from the lower layer to the upper layer according to the sequence. The in-order delivery function of the NR RLC device may include the following functions: if a single RLC SDU is divided into several RLC SDUs and then the RLC SDUs are received, then the several RLC SDUs are reassembled and the reassembled RLC SDU is sent.

[0248] The in-order delivery function of the NR RLC device may include a function of rearranging the received RLC PDU with reference to the RLC sequence number (SN) or the PDCP sequence number (SN), may include a function of rearranging the order to record the lost RLC PDU, may include a function of reporting the status of the lost RLC PDU to the transmission side, and may include a function of requesting retransmission of the lost RLC PDU.

[0249] The in-order delivery function of the NR RLC device may include the following function: if there is a lost RLC SDU, then only the RLC SDU before the lost RLC SDU is delivered to the upper layer according to the sequence.

[0250] The in-order delivery function of the NR RLC device may include the following function: despite the presence of lost RLC SDUs, if a predetermined timer expires, all RLC SDUs received before the timer has started are delivered to the upper layer in sequence.

[0251] The in-order delivery function of the NR RLC device may include the following function: despite the presence of lost RLC SDUs, if a predetermined timer expires, all RLC SDUs received until the current time point are delivered to the upper layer in sequence.

[0252] The NR RLC device can process the RLC PDU according to the order in which the RLC PDU has been received, regardless of the order based on the sequence number (out-of-order delivery), and transmit the processed RLC PDU to the NR PDCP device.

[0253] In the case of segment reception by the NR RLC device, the NR RLC device can receive segments that have been stored in the buffer or will be received later, reconfigure the segments into a single complete RLC PDU, and transmit the RLC PDU to the NR PDCP device.

[0254] The NR RLC layer may not include the cascading function and may perform the function in the NR MAC layer, or the cascading function may be replaced by a multiplexing function of the NR MAC layer.

[0255] In the above description, the out-of-order delivery function of the NR RLC device may mean a function of directly delivering the RLC SDU received from the lower layer to the upper layer regardless of the order. The out-of-order delivery function of the NR RLC device may include the following functions: if a single RLC SDU is divided into several RLC SDUs and then the RLC SDUs are received, reassemble the several RLC SDUs and send the reassembled RLC SDUs. The out-of-order delivery function of the NR RLC device may include a function of storing the RLC SN or PDCP SN of the received RLC PDU and sequencing the RLC PDU to record the lost RLC PDU.

[0256] According to part of the embodiment, NR MAC 2d-15 and 2d-30 may be connected to several NR RLC layer devices configured in a single terminal, and the main functions of NR MAC may include part of the functions below. However, the functions are not limited to the examples below.

[0257] - Mapping (mapping between logical channels and transport channels)

[0258] -Multiplexing and demultiplexing (multiplexing / demultiplexing of MAC SDU)

[0259] -Dispatch information report

[0260] -HARQ (error correction through HARQ)

[0261] - Priority handling between logical channels (priority handling between logical channels of a UE)

[0262] - Priority handling between UEs (priority handling between UEs through dynamic scheduling)

[0263] -MBMS service logo

[0264] -Transmission format selection

[0265] -filling

[0266] According to part of the embodiment, the NR physical layers 2d-20 and 2d-25 can perform channel coding and modulation on the upper layer data to make the data into OFDM symbols and send the OFDM symbols through the wireless channel, or can demodulate and channel decode the OFDM symbols received through the wireless channel, and then transmit the OFDM symbols to the upper layer.

[0267] Figure 2E is a block diagram illustrating an internal structure of a terminal employed according to an embodiment of the present disclosure.

[0268] refer to Figure 2E, the terminal may include a radio frequency (RF) processor 2e-10, a baseband processor 2e-20, a storage unit 2e-30, and a controller 2e-40. However, the present disclosure is not limited to the examples described above, and Figure 2E The terminal may include fewer or greater numbers of elements than those illustrated in FIG.

[0269] The RF processor 2e-10 can perform functions such as signal band changing, amplification, etc. for sending or receiving signals through a wireless channel. That is, the RF processor 2e-10 can up-convert the baseband signal provided by the baseband processor 2e-20 into an RF band signal, and then send the RF band signal through the antenna 2e-50, and can down-convert the RF band signal received through the antenna 2e-50 into a baseband signal. For example, the RF processor 2e-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), etc. The present disclosure is not limited to the examples described above. Figure 2E In the figure, only one antenna 2e-50 is illustrated, but the terminal may include multiple antennas. In addition, the RF processor 2e-10 may include multiple RF chains. In addition, the RF processor 2e-10 may perform beamforming. In order to perform beamforming, the RF processor 2e-10 may adjust the phase and size of each of the signals sent or received by multiple antennas or antenna elements. In addition, the RF processor 2e-10 may perform multiple input multiple output (MIMO) and may receive several layers when performing MIMO operation.

[0270] The baseband processor 2e-20 performs the conversion function between the baseband signal and the bit stream according to the physical layer protocol of the system. For example, when sending data, the baseband processor 2e-20 generates complex symbols by encoding and modulating the transmission bit stream. In addition, when receiving data, the baseband processor 2e-20 reconstructs the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 2e-10. For example, in the case of applying the orthogonal frequency division multiplexing (OFDM) scheme, when sending data, the baseband processor 2e-20 generates complex symbols by encoding and modulating the transmission bit stream, maps the complex symbols to subcarriers, and then configures the OFDM symbol by inverse fast Fourier transform (IFFT) calculation and cyclic prefix (CP) insertion. In addition, when receiving data, the baseband processor 2e-20 can divide the baseband signal provided from the RF processor 2e-10 into units of OFDM symbols, reconstruct the signal mapped to the subcarrier by fast Fourier transform (FFT), and then reconstruct the received bit stream by demodulation and decoding.

[0271] The baseband processor 2e-20 and the RF processor 2e-10 send and receive signals as described above. The baseband processor 2e-20 and the RF processor 2e-10 may be referred to as a transmitter, a receiver, a transceiver, or a communication unit. In addition, at least one of the baseband processor 2e-20 and the RF processor 2e-10 may include multiple communication modules to support a variety of different wireless access technologies. In addition, at least one of the baseband processor 2e-20 and the RF processor 2e-10 may include different communication modules to process signals in different frequency bands. For example, different wireless access technologies may include wireless LAN (e.g., IEEE802.11), cellular networks (e.g., LTE), etc. In addition, different frequency bands may include ultra-high frequency (SHF) (e.g., 2.NHz and NGHz) bands, millimeter (mm) waves (e.g., 60GHz) bands, etc. The terminal may send or receive signals to or from a base station using the baseband processor 2e-20 and the RF processor 2e-10, and the signal may include control information and data.

[0272] The storage unit 2e-30 stores data such as basic programs, applications, and configuration information for the operation of the terminal. Specifically, the storage unit 2e-30 can store information related to a second access node that performs wireless communication by using a second radio access technology. The storage unit 2e-30 provides the stored data in response to a request from the controller 2e-40. The storage unit 2e-30 may include a storage medium (such as ROM, RAM, hard disk, CD-ROM, and DVD) or a combination of storage media. In addition, the storage unit 2e-30 may include multiple memories.

[0273] The controller 2e-40 controls the overall operation of the terminal. For example, the controller 2e-40 sends or receives a signal through the baseband processor 2e-20 and the RF processor 2e-10. In addition, the controller 2e-40 records data in the storage unit 2e-30 and reads data from the storage unit 2e-30. To this end, the controller 2e-40 may include at least one processor 2e-42. For example, the controller 2e-40 may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls a higher layer (such as an application). In addition, at least one element in the terminal may be implemented as a single chip.

[0274] Figure 2F is a block diagram illustrating the configuration of an NR base station according to an embodiment of the present disclosure.

[0275] refer to Figure 2F , the base station may include an RF processor 2f-10, a baseband processor 2f-20, a backhaul communication unit 2f-30, a storage unit 2f-40, and a controller 2f-50. However, the present disclosure is not limited to the examples described above, and Figure 2F The base station may include fewer or greater numbers of elements than those illustrated in FIG.

[0276] The RF processor 2f-10 can perform functions such as signal band changing, amplification, etc. for sending or receiving signals through a wireless channel. That is, the RF processor 2f-10 can up-convert the baseband signal provided from the baseband processor 2f-20 into an RF band signal, and then send the RF band signal through the antenna 2f-60, and can down-convert the RF band signal received through the antenna 2f-60 into a baseband signal. For example, the RF processor 2f-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. Figure 2F In the figure, only one antenna 2f-60 is illustrated, but the RF processor 2f-10 may include multiple antennas. In addition, the RF processor 2f-10 may include multiple RF chains. In addition, the RF processor 2f-10 can perform beamforming. In order to perform beamforming, the RF processor 2f-10 can adjust the phase and size of each of the signals sent or received through multiple antennas or antenna elements. The RF processor can perform downlink MIMO operations by transmitting at least one layer.

[0277] The baseband processor 2f-20 performs the conversion function between the baseband signal and the bit stream according to the physical layer protocol of the first wireless access technology. For example, when sending data, the baseband processor 2f-20 generates complex symbols by encoding and modulating the transmitted bit stream. In addition, when receiving data, the baseband processor 2f-20 reconstructs the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 2f-10. For example, in the case of applying the OFDM scheme, when sending data, the baseband processor 2f-20 generates complex symbols by encoding and modulating the transmitted bit stream, maps the complex symbols to subcarriers, and then configures the OFDM symbols by IFFT calculation and CP insertion. In addition, when receiving data, the baseband processor 2f-20 can divide the baseband signal provided by the RF processor 2f-10 into units of OFDM symbols, reconstruct the signal mapped to the subcarrier by FFT, and then reconstruct the received bit stream by demodulation and decoding. The baseband processor 2f-20 and the RF processor 2f-10 can send and receive signals as described above. Therefore, the baseband processor 2f-20 and the RF processor 2f-10 can be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit. The base station can send or receive signals to or from a terminal by using the baseband processor 2f-20 and the RF processor 2f-10, and the signals may include control information and data.

[0278] The backhaul communication unit 2f-30 provides an interface for performing communication with other nodes within the network. That is, the backhaul communication unit 2f-30 can convert a bit stream sent from the main base station to another node (e.g., an auxiliary base station, a core network, etc.) into a physical signal, and can convert a physical signal received from another node into a bit stream. The backhaul communication unit 2f-30 can be included in the communication unit.

[0279] The storage unit 2f-40 stores data such as basic programs, applications, and configuration information for the operation of the base station. The storage unit 2f-40 may store information related to the bearer assigned to the connection terminal, measurement results reported from the connection terminal, and the like. In addition, the storage unit 2f-40 may store information used as a determination criterion for whether to provide or stop providing multiple connections to the terminal. The storage unit 2f-40 provides the stored data in response to a request from the controller 2f-50. The storage unit 2f-40 may include a storage medium (such as ROM, RAM, hard disk, CD-ROM, and DVD) or a combination of storage media. In addition, the storage unit 2f-40 may include a plurality of memories. According to part of the embodiment, the storage unit 2f-40 may store a program for executing the buffer status reporting method according to the present disclosure.

[0280] The controller 2f-50 controls the overall operation of the base station. For example, the controller 2f-50 sends or receives a signal through the baseband processor 2f-20 and the RF processor 2f-10 or the backhaul communication unit 2f-30. In addition, the controller 2f-50 records data in the storage unit 2f-40 and reads data from the storage unit 2f-40. To this end, the controller 2f-50 may include at least one processor 2f-52. In addition, at least one element in the base station may be implemented as a single chip.

[0281] Figure 2G The expiration of the timer T312 according to an embodiment of the present disclosure is illustrated.

[0282] The terminal 2g-1 maintains the connection with the serving cell 2g-5 (2g-15). The serving cell may transmit an RRCReconfiguration message including the measurement configuration to the terminal (2g-20). In the measurement configuration, reportConfig and measObject may be grouped into a pair to configure one measurement.

[0283] As reportConfig, one of the reportConfigs for the purpose of periodic reporting, event-based reporting, or CGI reporting can be selected. In the case of event-based reporting, the type of the corresponding event can be configured to be indicated by A1, A2, A3, A4, A5, and A6, and the configuration values ​​required for each type of event (e.g., information such as a1-threshold, a2-threshold, a3-offset, a4-threshold, a5-Threshold1, a5-Threshold2, a6-offset, reportOnLeave configuration, hysteresis value, timeToTrigger, usewhiteCellList configuration, etc.) can be configured for each type of event. In addition, the information may include a configuration value for selecting SSB or CSI-RS as the type of reference signal to be measured, a reporting interval configuration value, the number of available transmissions for a trigger event (reportAmount value), the unit of the cell measurement value to be included in the MR (SINR / RSRP / RSRQ), the maximum number of non-service cells that can be included when including the measurement results in the MR, the unit of the measurement value when including the measurement results for each beam in the MR, the maximum number of beams to be included when including the measurement results for each beam in the MR, an indicator indicating whether to include beam results, an indicator indicating whether to include results for the best neighboring cell for each service frequency, and an indicator indicating whether to use T312.

[0284] The measurement object may include information on the SSB frequency to be measured, SSB subcarrier spacing information, SSB measurement timing configuration information, CSI-RS frequency position information used when measuring CSI-RS for cell signal strength, index information of specific SSB or CSI-RS signals for cell signal strength measurement, beam-specific minimum strength information of SSB or CSI-RS required for cell signal strength calculation, minimum number of SSB or CSI-RS required for cell signal strength calculation, number configuration information to be applied during measurement, Qoffset value to be applied to cells present in MO, and The information of cells to be removed from the table and cells to be added to the cell list, information of cells to be removed from the black cell list and cells to be added to the black cell list, information of cells to be removed from the white cell list and cells to be added to the white cell list, information of the frequency band where the SSB or CSI-RS configured in the MO is located, information of the measurement period of the current Scell ​​when the Scell ​​is configured in the frequency where the MO is located, and the timer T312 value to be used by the terminal as the timer T312 value when useT312 is configured in the reportConfig associated with the MO and the corresponding measurement trigger MR.

[0285] The terminal can perform measurements at the moment of receiving the measurement configuration (2g-25). If the following conditions are met, the terminal can start T312. That is, T310 can operate for Pcell (2g-30). If the measurement event for which the measurement report is pre-configured meets the entry condition during the timetotrigger interval so that the measurement report is triggered, and useT312 is configured in the reportConfig of the configuration event, the terminal can operate T312 (2g-35). The T312 value used when operating T312 can be the T312 value configured in the measObject of the servingCellMO configured with PCell, primary carrier, PCell service frequency or PCell. If T312 expires before T310 expires, the terminal can declare a radio link failure (RLF) to the MCG, and if AS security has not been started, the terminal can set the release cause to "other" and change to RRC_IDLE. If AS security has been activated, but SRB 2 and at least one DRB have not been set, the terminal may set the release cause to "RRC connection failure" and transition to RRC_IDLE. In other cases, the terminal may perform a connection reestablishment procedure.

[0286] For another example, if the terminal performs a connection reestablishment procedure before T312 expires after operations (2g-15), (2g-20), (2g-25), (2g-30) and (2g-35), the terminal may stop T312.

[0287] An example of a connection reestablishment process may include cell selection, sending a random access preamble to the selected cell 2g-10 if the cell exists (2g-45), receiving an RAR from the cell (2g-50), sending an RRC reestablishment request message (2g-55), receiving an RRC reestablishment message from the cell (2g-60), and sending an RRC reestablishment completion message to the cell (2g-65).

[0288] Figure 2H A case where the timer T312 expires due to the expiration of the timer T310 according to an embodiment of the present disclosure is illustrated.

[0289] The terminal 2h-1 maintains the connection with the serving cell 2h-5 (2h-15). The serving cell may transmit an RRCReconfiguration message including the measurement configuration to the terminal (2h-20). In the measurement configuration, reportConfig and measObject may be grouped into a pair to configure one measurement.

[0290] As reportConfig, one of the reportConfigs for the purpose of periodic reporting, event-based reporting, or CGI reporting can be selected. In the case of event-based reporting, the type of the corresponding event can be configured to be indicated by A1, A2, A3, A4, A5, and A6, and the configuration values ​​required for each type of event (e.g., information such as a1-threshold, a2-threshold, a3-offset, a4-threshold, a5-Threshold1, a5-Threshold2, a6-offset, reportOnLeave configuration, hysteresis value, timeToTrigger, usewhiteCellList configuration, etc.) can be configured for each type of event. In addition, the information may include a configuration value for selecting SSB or CSI-RS as the type of reference signal to be measured, a reporting interval configuration value, the number of available transmissions for a trigger event (reportAmount value), the unit of the cell measurement value to be included in the MR (SINR / RSRP / RSRQ), the maximum number of non-service cells that can be included when including the measurement results in the MR, the unit of the measurement value when including the measurement results for each beam in the MR, the maximum number of beams to be included when including the measurement results for each beam in the MR, an indicator indicating whether to include beam results, an indicator indicating whether to include results for the best neighboring cell for each service frequency, and an indicator indicating whether to use T312.

[0291] The measurement object may include information on the SSB frequency to be measured, SSB subcarrier spacing information, SSB measurement timing configuration information, CSI-RS frequency position information used when measuring CSI-RS for cell signal strength, index information of specific SSB or CSI-RS signals for cell signal strength measurement, beam-specific minimum strength information of SSB or CSI-RS required for cell signal strength calculation, minimum number of SSB or CSI-RS required for cell signal strength calculation, number configuration information to be applied during measurement, Qoffset value to be applied to cells present in MO, and The information of cells to be removed from the table and cells to be added to the cell list, information of cells to be removed from the black cell list and cells to be added to the black cell list, information of cells to be removed from the white cell list and cells to be added to the white cell list, information of the frequency band where the SSB or CSI-RS configured in the MO is located, information of the measurement period of the current Scell ​​when the Scell ​​is configured in the frequency where the MO is located, and the timer T312 value to be used by the terminal as the timer T312 value when useT312 is configured in the reportConfig associated with the MO and the corresponding measurement trigger MR.

[0292] The terminal can perform measurements at the moment of receiving the measurement configuration (2h-25). If the following conditions are met, the terminal can start T312. That is, T310 can be operated for Pcell (2h-30). If the measurement event for which the measurement report is pre-configured meets the entry condition during the timetotrigger interval so that the measurement report is triggered, and useT312 is configured in the reportConfig of the configuration event, the terminal can operate T312 (2h-35). The T312 value used in the T312 operation can be the T312 value configured in the measObject of the servingCellMO configured with PCell, primary carrier, PCell service frequency or PCell.

[0293] If T310 stops before T312 expires, the terminal can stop T312 operation. Since N311 consecutive "synchronization" indications are received from the lower layer after T310 is started for Pcell, T310 may stop (2h-40). After stopping, the terminal can perform normal communication with the serving cell (2h-45).

[0294] Fig.2I It illustrates a case where a handover message is received before the timer T312 expires according to an embodiment of the present disclosure.

[0295] The terminal 2i-1 maintains the connection with the serving cell 2i-5 (2i-15). The serving cell may transmit a message including the measurement configuration to the terminal (2i-20). The message may be an RRCReconfiguration message. In the measurement configuration, reportConfig and measObject may be grouped into a pair to configure one measurement.

[0296] As reportConfig, one of the reportConfigs for the purpose of periodic reporting, event-based reporting, or CGI reporting can be selected. In the case of event-based reporting, the type of the corresponding event can be configured to be indicated by A1, A2, A3, A4, A5, and A6, and the configuration values ​​required for each type of event (e.g., information such as a1-threshold, a2-threshold, a3-offset, a4-threshold, a5-Threshold1, a5-Threshold2, a6-offset, reportOnLeave configuration, hysteresis value, timeToTrigger, usewhiteCellList configuration, etc.) can be configured for each type of event. In addition, the information may include a configuration value for selecting SSB or CSI-RS as the type of reference signal to be measured, a reporting interval configuration value, the number of available transmissions for a trigger event (reportAmount value), the unit of the cell measurement value to be included in the MR (SINR / RSRP / RSRQ), the maximum number of non-service cells that can be included when including the measurement results in the MR, the unit of the measurement value when including the measurement results for each beam in the MR, the maximum number of beams to be included when including the measurement results for each beam in the MR, an indicator indicating whether to include beam results, an indicator indicating whether to include results for the best neighboring cell for each service frequency, and an indicator indicating whether to use T312.

[0297] The measurement object may include information on the SSB frequency to be measured, SSB subcarrier spacing information, SSB measurement timing configuration information, CSI-RS frequency position information used when measuring CSI-RS for cell signal strength, index information of specific SSB or CSI-RS signals for cell signal strength measurement, beam-specific minimum strength information of SSB or CSI-RS required for cell signal strength calculation, minimum number of SSB or CSI-RS required for cell signal strength calculation, number configuration information to be applied during measurement, Qoffset value to be applied to cells present in MO, and The information of cells to be removed from the table and cells to be added to the cell list, information of cells to be removed from the black cell list and cells to be added to the black cell list, information of cells to be removed from the white cell list and cells to be added to the white cell list, information of the frequency band where the SSB or CSI-RS configured in the MO is located, information of the measurement period of the current Scell ​​when the Scell ​​is configured in the frequency where the MO is located, and the timer T312 value to be used by the terminal as the timer T312 value when useT312 is configured in the reportConfig associated with the MO and the corresponding measurement trigger MR.

[0298] The terminal may perform measurements at the moment of receiving the measurement configuration (2i-25). If the following conditions are met, the terminal may start T312. That is, T310 may operate for the Pcell (2i-30). If the measurement event for which the measurement report is pre-configured meets the entry conditions during the timetotrigger interval so that the measurement report is triggered, and useT312 is configured in the reportConfig of the configuration event, the terminal may operate T312 (2i-35). The T312 value used when operating T312 may be the T312 value configured in the measObject of the servingCellMO configured with the PCell, the primary carrier, the PCell service frequency, or the PCell. Before T312 expires, the terminal may receive a message including reconfigurationWithSync from the serving cell (2i-40). The message may be an RRCReconfiguration message or a switching command message. The terminal may stop T310 and T312 (2i-45). After the stop, the terminal may perform handover to the target cell through the target cell information included in the received message (2i-50).

[0299] Figure 2J It illustrates a case where the exit condition of an event is satisfied during the operation of the timer T312 according to an embodiment of the present disclosure.

[0300] The terminal 2j-1 maintains a connection with the serving cell 2j-5 (2j-15). The serving cell may transmit a message including a measurement configuration to the terminal (2j-20). The message may be an RRCReconfiguration message. In the measurement configuration, reportConfig and measObject may be grouped into a pair to configure a measurement.

[0301] As reportConfig, one of the reportConfigs for the purpose of periodic reporting, event-based reporting, or CGI reporting can be selected. In the case of event-based reporting, the type of the corresponding event can be configured to be indicated by A1, A2, A3, A4, A5, and A6, and the configuration values ​​required for each type of event (e.g., information such as a1-threshold, a2-threshold, a3-offset, a4-threshold, a5-Threshold1, a5-Threshold2, a6-offset, reportOnLeave configuration, hysteresis value, timeToTrigger, usewhiteCellList configuration, etc.) can be configured for each type of event. In addition, the information may include a configuration value for selecting SSB or CSI-RS as the type of reference signal to be measured, a reporting interval configuration value, the number of available transmissions for a trigger event (reportAmount value), the unit of the cell measurement value to be included in the MR (SINR / RSRP / RSRQ), the maximum number of non-service cells that can be included when including the measurement results in the MR, the unit of the measurement value when including the measurement results for each beam in the MR, the maximum number of beams to be included when including the measurement results for each beam in the MR, an indicator indicating whether to include beam results, an indicator indicating whether to include results for the best neighboring cell for each service frequency, and an indicator indicating whether to use T312.

[0302] The measurement object may include information on the SSB frequency to be measured, SSB subcarrier spacing information, SSB measurement timing configuration information, CSI-RS frequency position information used when measuring CSI-RS for cell signal strength, index information of specific SSB or CSI-RS signals for cell signal strength measurement, beam-specific minimum strength information of SSB or CSI-RS required for cell signal strength calculation, minimum number of SSB or CSI-RS required for cell signal strength calculation, number configuration information to be applied during measurement, Qoffset value to be applied to cells present in MO, and The information of cells to be removed from the table and cells to be added to the cell list, information of cells to be removed from the black cell list and cells to be added to the black cell list, information of cells to be removed from the white cell list and cells to be added to the white cell list, information of the frequency band where the SSB or CSI-RS configured in the MO is located, information of the measurement period of the current Scell ​​when the Scell ​​is configured in the frequency where the MO is located, and the timer T312 value to be used by the terminal as the timer T312 value when useT312 is configured in the reportConfig associated with the MO and the corresponding measurement trigger MR.

[0303] The terminal can perform measurement at the moment of receiving the measurement configuration (2j-25). If the following conditions are met, the terminal can start T312. That is, T310 can be operated for Pcell (2j-30). If the event of the measurement for which the measurement report is pre-configured meets the entry condition during the timetotrigger interval so that the measurement report is triggered, and useT312 is configured in the reportConfig of the configuration event, the terminal can operate T312 (2j-35). The T312 value used when operating T312 can be the T312 value configured in the measObject of the servingCellMO configured with PCell, primary carrier, PCell service frequency or PCell. If the terminal meets the exit condition of the event that has triggered MR in operation 2j-35, the terminal can stop T312 during timeToTrigger before T312 expires (2j-40). After stopping, normal operation can be performed (2j-45).

[0304] The following shows the specification of an embodiment and example of ASN.1.

[0305] 5.5.4 Measurement report trigger

[0306] 5.5.4.1 Overview

[0307] If security has been successfully initiated, the UE shall:

[0308] 1>For each measId included in measIdList in VarMeasConfig:

[0309] 2>If the corresponding reportConfig includes a reportType set to eventTriggered or periodic;

[0310] 3>If the corresponding measObject involves NR;

[0311] 4>If eventA1 or eventA2 is configured in the corresponding reportConfig:

[0312] 5> Then only the applicable serving cells are considered;

[0313] 4>If eventA3 or eventA5 is configured in the corresponding reportConfig:

[0314] 5> If the serving cell is associated with a measObjectNR and the neighbor is associated with another measObjectNR, then any serving cell associated with the other measObjectNR is also considered a neighboring cell;

[0315] 4> For measurement events other than eventA1 or eventA2:

[0316] 5>If useWhiteCellList is set to true:

[0317] 6> Then when the cell of interest is included in the whiteCellsToAddModList defined for this measId in VarMeasConfig, any neighboring cells detected based on the parameters in the associated measObjectNR are considered applicable;

[0318] 5> Otherwise:

[0319] 6> Then when the cell of interest is not included in the blackCellsToAddModList defined for this measId in VarMeasConfig, any neighboring cell detected based on the parameters in the associated measObjectNR is considered applicable;

[0320] 3> Otherwise, if the corresponding measObject involves E-UTRA;

[0321] 4> Then when the cell of interest is not included in the blackCellsToAddModListEUTRAN defined for this measId in VarMeasConfig, any neighboring cell detected on the associated frequency is considered applicable;

[0322] 2> Otherwise, if the corresponding reportConfig includes a reportType set to reportCGI:

[0323] 3>Then the cell detected on the associated measObject is considered applicable, which cell has a physical cell identifier that matches the value of cellForWhichToReportCGI included in the corresponding reportConfig in VarMeasConfig;

[0324] 2> If reportType is set to eventTriggered and if the entry condition applicable to the event (i.e. the event corresponding to the eventId of the corresponding reportConfig in VarMeasConfig) is satisfied for one or more applicable cells for all measurements after layer 3 filtering during timeToTrigger defined for the event in VarMeasConfig, and VarMeasReportList does not include a measurement report entry for the measId (first cell triggering event):

[0325] 3>Then include the measurement report entry for the measId in VarMeasReportList;

[0326] 3>Then set numberOfReportsSent defined for the measId in VarMeasReportList to 0;

[0327] 3> Then the cellsTriggeredList defined for the measId in VarMeasReportList includes (multiple) cells of interest;

[0328] 3> If the UE supports T312 and if useT312 is included for this event and if T310 for PCell is running:

[0329] 4> If T312 is not running:

[0330] 5>Then start timer T312 using the value configured in measObject associated with PCell;

[0331] 3> then initiate the measurement reporting process as specified in 5.5.5;

[0332] 2> Otherwise, if reportType is set to eventTriggered and if the entry condition applicable to this event (i.e. the event corresponding to the eventId of the corresponding reportConfig in VarMeasConfig) is met for one or more applicable cells not included in cellsTriggeredList of all measurements after layer 3 filtering during timeToTrigger defined for this event in VarMeasConfig (subsequent cell triggering event):

[0333] 3>Then set numberOfReportsSent defined for the measId in VarMeasReportList to 0;

[0334] 3> Then the cellsTriggeredList defined for the measId in VarMeasReportList includes (multiple) cells of interest;

[0335] 3> If the UE supports T312 and if useT312 is included for this event and if T310 for PCell is running:

[0336] 4> If T312 is not running:

[0337] 5>Then start timer T312 using the value configured in measObject associated with PCell;

[0338] 3> then initiate the measurement reporting process as specified in 5.5.5;

[0339] 2> Otherwise, if reportType is set to eventTriggered and if, after layer 3 filtering during timeToTrigger defined for this event in VarMeasConfig, the departure conditions applicable to this event are met for all measurements for one or more of the cells included in cellsTriggeredList defined in VarMeasReportList:

[0340] 3> Then remove the concerned cells from the cellsTriggeredList defined for the measId in VarMeasReportList;

[0341] 3> If it is running, stop T312

[0342] 3>If reportOnLeave is set to true for the corresponding report configuration:

[0343] 4> then initiate the measurement reporting process as specified in 5.5.5;

[0344] 3> If the cellsTriggeredList defined for the measId in VarMeasReportList is empty:

[0345] 4> Then remove the measurement report entry defined for the measId in VarMeasReportList;

[0346] 4> If it is running, stop the periodic report timer for this measId;

[0347] 2> If reportType is set to periodic and if the (first) measurement result is available:

[0348] 3>Then include the measurement report entry for the measId in VarMeasReportList;

[0349] 3>Then set numberOfReportsSent defined for the measId in VarMeasReportList to 0;

[0350] 3>If reportAmount exceeds 1:

[0351] 4> Initiate the measurement reporting procedure as specified in 5.5.5 immediately after the quantity to be reported becomes available for the NR SpCell;

[0352] 3> Otherwise (that is, reportAmount is equal to 1):

[0353] 4> then initiate the measurement reporting procedure as specified in 5.5.5 immediately after the number to be reported becomes available for the NR SpCell and the strongest cell among the available cells;

[0354] 2> When the periodic reporting timer for the measId expires:

[0355] 3> Initiate the measurement reporting process as specified in 5.5.5.

[0356] 2>If reportType is set to reportCGI;

[0357] 3> If the UE obtains SIB1 or SystemInformationBlockType1 for the requested cell; or

[0358] 3> If the UE detects that the requested NR cell does not transmit SIB1 (see TS 38.213

[13] , clause 13):

[0359] 4>Then stop timer T321;

[0360] 4>Then include the measurement report entry for the measId in VarMeasReportList;

[0361] 4>Then set numberOfReportsSent defined for the measId in VarMeasReportList to 0;

[0362] 4> then initiate the measurement reporting process as specified in 5.5.5;

[0363] 2>When the T321 for this measId expires:

[0364] 3> Include the measurement report entry for the measId in VarMeasReportList;

[0365] 3> Set numberOfReportsSent defined for this measId in VarMeasReportList to 0;

[0366] 3> Initiate the measurement reporting process as specified in 5.5.5.

[0367] Figure 2K The diagram illustrates management when applying for T312 to the SCG according to whether SRB3 is configured when the terminal is configured with MR-DC as one of the other embodiments of the present patent.

[0368] The terminal 2k-1 maintains the connection with the MgNB 2k-5 (2k-15). The terminal 2k-1 may be configured with MR-DC by the mother node (MN) 2k-5, and may configure SRB3 (2k-20). Otherwise, the measurement report and the handover command for the SCG may be configured to be transmitted to SRB3.

[0369] SgNB 2k-10 may configure useT312 in a specific report configuration in the measurement configuration for SCG (2k-23). ​​In addition, the SgNB may configure the T312 value in the measurement object in the measurement configuration. The reportConfig configured with useT312 and the measurement object configured with the T312 value may mean a measurement as a pair. The terminal that has received the configuration may perform the corresponding measurement (2k-25).

[0370] T310 configured in the current Pscell may be started (2k-30). If a measurement event in a measurement configured by the terminal to be measured in the SCG with reportConfig indicated by useT312 satisfies the entry condition during timetotrigger so that the measurement report is triggered, the terminal may operate T312 for the Pscell. The value of T312 may be the T312 value configured in the measurement object that has triggered the measurement report or the T312 value configured in the measurement object configured with the frequency of the current Pscell, the Pscell service frequency, or the servingCellMO of the Pscell (2k-35).

[0371] On the assumption that the timer T312 has been operated, the timer can be stopped in the following case.

[0372] Timer T312 may be stopped in the case of receiving a reconfiguration message including a reconfigurationWithSync or SCG change command for the SCG, in the case of recovery of a physical layer problem in the SCG, or in the case of receiving a predetermined number of IN-sync indications from a lower layer for the Pscell in succession. Timer T312 may be stopped in the case of timer T310 configured in the Pscell being stopped.

[0373] Specifically, in the case where a reconfigurationWithSync for SCG or a reconfiguration message including an SCG change command is received through SRB3, the timer may be stopped.

[0374] If the initial T312 value expires, the terminal can recognize the occurrence of SCG RLF (2k-40).

[0375] Therefore, the terminal can stop the timer T310 of the operation configured in the Pscell. In addition, the terminal can perform the SCGFailureInformation process (2k-40). To this end, the terminal can transmit an SCGFailureInformation message to the MN 2k-5 by using SRB1. The message may include a fault report, and the fault cause added to the report may be the expiration of T312 for the SCG.

[0376] 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 present disclosure as defined by the following claims and their equivalents.

Claims

1. A method performed by a terminal in a wireless communication system, the method comprising: receiving, from a base station, a first message including information related to measurements; measuring a measurement object MO based on said information related to said measurement; as well as transmitting the measurement report to the base station based on the measurement in case a triggering event for transmitting the measurement report is met, The information related to the measurement includes a measurement identifier and a report configuration, Wherein, in a case where the report configuration includes configuration information related to neighboring cell measurement, the measurement report includes measurement results of cells belonging to the first cell set and measurement results of cells belonging to the second cell set, The first cell set is a serving cell set configured with a servingCell measurement object servingCellMO. The second cell set is a set of non-serving cells, and Each of the non-serving cells is associated with a servingCellMO.

2. The method according to claim 1, in, Each of the second cells is associated with a measurement identifier configured as a servingCellMO among the MOs except the MO corresponding to the measurement identifier associated with the triggering event for transmission of the measurement report.

3. The method according to claim 2, wherein: For the cell corresponding to the measurement identifier configured as the servingCellMO, the second cell has the highest measurement reference signal received power RSRP, and The second cell has a highest measured reference signal received quality RSRQ when the RSRP measurement result is not available, and has a highest measured noise and interference ratio SINR when the RSRQ measurement result is not available.

4. The method according to claim 1, wherein: In a case where the report configuration does not include the configuration information related to neighbor cell measurement, the measurement report only includes measurement results of cells belonging to the first cell set.

5. A method performed by a base station in a wireless communication system, the method comprising: Sending a first message including information related to the measurement to the terminal; as well as receiving a measurement report from the terminal, The measurement report is configured based on the measurement of the measurement object MO performed by the terminal based on the information related to the measurement when a triggering event for transmitting the measurement report is met, The information related to the measurement includes a measurement identifier and a report configuration, Wherein, in a case where the report configuration includes configuration information related to neighboring cell measurement, the measurement report includes measurement results of cells belonging to the first cell set and measurement results of cells belonging to the second cell set, The first cell set is a serving cell set configured with a servingCell measurement object servingCellMO. The second cell set is a set of non-serving cells, and Each of the non-serving cells is associated with a servingCellMO.

6. The method according to claim 5, in, Each of the second cells is associated with a measurement identifier configured as a servingCellMO among the MOs except the MO corresponding to the measurement identifier associated with the triggering event for transmission of the measurement report.

7. The method according to claim 6, wherein: For the cell corresponding to the measurement identifier configured as the servingCellMO, the second cell has the highest measurement reference signal received power RSRP, and The second cell has a highest measured reference signal received quality RSRQ when the RSRP measurement result is not available, and has a highest measured noise and interference ratio SINR when the RSRQ measurement result is not available.

8. The method according to claim 5, wherein: In a case where the report configuration does not include the configuration information related to neighbor cell measurement, the measurement report only includes measurement results of cells belonging to the first cell set.

9. A terminal, comprising: a transceiver configured to transmit or receive at least one signal; as well as at least one processor operatively coupled to the transceiver, wherein the at least one processor is configured to: receiving a first message including measurement-related information from a base station, measuring the measurement object MO based on said information related to said measurement, and transmitting the measurement report to the base station based on the measurement in case a triggering event for transmitting the measurement report is met, The information related to the measurement includes a measurement identifier and a report configuration, Wherein, in a case where the report configuration includes configuration information related to neighboring cell measurement, the measurement report includes measurement results of cells belonging to the first cell set and measurement results of cells belonging to the second cell set, and The first cell set is a serving cell set configured with a servingCell measurement object servingCellMO. The second cell set is a set of non-serving cells, and Each of the non-serving cells is associated with a servingCellMO.

10. The terminal according to claim 9, in, Each of the second cells is associated with a measurement identifier configured as a servingCellMO among the MOs except the MO corresponding to the measurement identifier associated with the triggering event for transmission of the measurement report. The terminal according to claim 10 , wherein: For the cell corresponding to the measurement identifier configured as the servingCellMO, the second cell has the highest measurement reference signal received power RSRP, and The second cell has a highest measured reference signal received quality RSRQ when the RSRP measurement result is not available, and has a highest measured noise and interference ratio SINR when the RSRQ measurement result is not available.

12. The terminal according to claim 9, wherein: In a case where the report configuration does not include the configuration information related to neighbor cell measurement, the measurement report only includes measurement results of cells belonging to the first cell set.

13. A base station, comprising: a transceiver configured to transmit or receive at least one signal; as well as at least one processor operatively coupled to the transceiver, wherein the at least one processor is configured to: sending a first message including information related to the measurement to the terminal, and receiving a measurement report from the terminal, The measurement report is configured based on the measurement of the measurement object MO performed by the terminal based on the information related to the measurement when a triggering event for transmitting the measurement report is met, The information related to the measurement includes a measurement identifier and a report configuration, Wherein, in a case where the report configuration includes configuration information related to neighboring cell measurement, the measurement report includes measurement results of cells belonging to the first cell set and measurement results of cells belonging to the second cell set, and The first cell set is a serving cell set configured with a servingCell measurement object servingCellMO. The second cell set is a set of non-serving cells, and Each of the non-serving cells is associated with a servingCellMO.

14. The base station according to claim 13, in, Each of the second cells is associated with a measurement identifier configured as a servingCellMO among the MOs except for the MO corresponding to the measurement identifier associated with the triggering event for transmission of the measurement report, Wherein, for the cell corresponding to the measurement identifier configured as the servingCellMO, the second cell has the highest measurement reference signal received power RSRP, and The second cell has a highest measured reference signal received quality RSRQ when the RSRP measurement result is not available, and has a highest measured noise and interference ratio SINR when the RSRQ measurement result is not available.

15. The base station according to claim 13, wherein: In a case where the report configuration does not include the configuration information related to neighbor cell measurement, the measurement report only includes measurement results of cells belonging to the first cell set.

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