Terminal and radio communication method

Abstract

To provide a terminal and a radio communication method in which a network can reliably recognize a state of small amount of data transmission (SDT) by user equipment (UE).SOLUTION: In a wireless communication system, a UE controls data transmission in an inactive state of a radio resource control layer according to a random access procedure. When the data transmission fails, the UE transmits a report on a result of the data transmission to the network.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a terminal and a radio communication method that support an inactive state of a radio resource control layer. [Background technology]

[0002] The 3rd Generation Partnership Project (3GPP) has developed specifications for Long Term Evolution (LTE) and 5th generation mobile communication systems (5G, also known as New Radio (NR) or Next Generation (NG)), and is also developing specifications for the next generation, known as Beyond 5G, 5G Evolution, or 6G.

[0003] 3GPP Release 15 and Release 16 (NR) define a new inactive state (RRC INACTIVE) for the Radio Resource Control layer (RRC). In RRC INACTIVE, the user equipment (UE) and radio access network (RAN) retain the UE context, but the radio bearer configuration is released.

[0004] 3GPP Release 17 is studying small data transmission (SDT) in such an inactive state, and is also studying Self-Organizing Networks (SON) that support SDT (Non-Patent Document 1). [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] "Moderator's summary for discussion [RAN93e-R18Prep-16] Additional RAN1 / 2 / 3 candidate topics Set 3", RP-211666, 3GPP TSG RAN#93e, 3GPP, September 2021 Summary of the Invention

[0006] When realizing SON that supports SDT, the following problems may occur: For example, even if a UE fails in SDT, the network cannot recognize the state of the SDT, such as the failure of the SDT.

[0007] Therefore, the following disclosure has been made in consideration of such circumstances, and aims to provide a terminal and a wireless communication method that enable the network to reliably recognize the SDT state of the UE.

[0008] One aspect of the present disclosure is a terminal (UE200) comprising a control unit (control unit 240) that controls data transmission in an inactive state of a radio resource control layer in accordance with a random access procedure or a configured permission from a network, and a transmission unit (SDT processing unit 230) that transmits a report on the result of the data transmission to the network if the data transmission fails.

[0009] One aspect of the present disclosure is a wireless communication method including the steps of controlling data transmission in an inactive state of a radio resource control layer according to a random access procedure or a configured grant from a network, and, if the data transmission fails, transmitting a report on a result of the data transmission to the network. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing the overall schematic configuration of a wireless communication system 10. As shown in FIG. [Figure 2] Figure 2 is a functional block diagram of gNB100. [Figure 3]FIG. 3 is a functional block diagram of the UE 200. [Figure 4] FIG. 4 is a diagram illustrating an example of a sequence of RACH-based SDT. [Figure 5] FIG. 5 is a diagram showing an example of a sequence of CG based SDT. [Figure 6] FIG. 6 is a diagram showing an example of a sequence when the RACH-based SDT fails. [Figure 7] FIG. 7 is a diagram showing an example of a sequence when the CG based SDT fails. [Figure 8] FIG. 8 is a diagram showing an example of the hardware configuration of gNB100 and UE200. [Figure 9] FIG. 9 is a diagram showing an example of the configuration of a vehicle 2001. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments will be described with reference to the drawings. Note that the same or similar reference numerals are used to designate the same functions or configurations, and descriptions thereof will be omitted as appropriate.

[0012] (1) Overall configuration of wireless communication system 1 is a schematic diagram of the overall configuration of a wireless communication system 10 according to this embodiment. The wireless communication system 10 is a wireless communication system conforming to 5G New Radio (NR), and includes a Next Generation-Radio Access Network 20 (hereinafter, NG-RAN 20) and a terminal 200 (User Equipment 200, hereinafter, UE 200).

[0013] The wireless communication system 10 may be a wireless communication system conforming to a system called Beyond 5G, 5G Evolution, or 6G.

[0014] The NG-RAN 20 includes a radio base station 100 (hereinafter, gNB 100). Note that the specific configuration of the radio communication system 10, including the number of gNBs and UEs, is not limited to the example shown in FIG.

[0015] The NG-RAN 20 actually includes multiple NG-RAN nodes, specifically, gNBs (or ng-eNBs), and is connected to a 5G core network (5GC, not shown). The NG-RAN 20 is connected to an Access and Mobility Management Function (AMF), which is included in the 5G system architecture and provides access and mobility management functions for the UE 200. The NG-RAN 20 and the 5GC may be simply referred to as a "network."

[0016] The gNB 100 is a radio base station conforming to NR, and performs radio communication conforming to NR with the UE 200. Note that the gNB 100 may be configured with a CU (Central Unit) and a DU (Distributed Unit), and the DU may be separated from the CU and installed in a geographically different location.

[0017] The gNB100 and UE200 are capable of supporting Massive MIMO, which generates more directional beams by controlling radio signals transmitted from multiple antenna elements, Carrier Aggregation (CA), which bundles and uses multiple component carriers (CCs), and Dual Connectivity (DC), which enables simultaneous communication between the UE and multiple NG-RAN nodes.

[0018] In the wireless communication system 10, in addition to RRC CONNECTED and RRC IDLE, RRC INACTIVE may be defined as a state of the radio resource control layer (RRC). In RRC INACTIVE, the UE 200 and the radio access network (NG-RAN 20) retain the context of the UE 200, but the radio bearer settings may be interpreted as being released.

[0019] More specifically, in RRC INACTIVE, the UE AS (Access Stratum) context is held in gNB100 / AMF and UE200, but within gNB100, the Signaling Radio Bearer (SRB) / Data Radio Bearer (DRB) settings may be interpreted as being released.

[0020] The UE 200 can transition between an RRC CONNECTED state and an RRC INACTIVE state (which may also be referred to as an inactive state), and can transition between an RRC INACTIVE state and an RRC IDLE state.

[0021] Furthermore, the wireless communication system 10 may support small data transmission (SDT) by the UE 200 in the RRC INACTIVE state. SDT may mean transmission and reception of small amounts of data in the RRC INACTIVE state.

[0022] In other words, in SDT, no radio bearer is set up, but data transmission (reception) is possible. Note that "data" may mean data transmitted via a data channel. Note that "data" may mean user data, and "control" may mean various control signals transmitted via a control channel.

[0023] SDT may be defined as an SDT with a random access procedure (RA procedure) (Random Access (RACH) based SDT) and an SDT based on a configured grant (CG, also called a configured permission) from the network (Configured Grant (CG) based SDT).

[0024] (2) Functional block configuration of wireless communication system Next, a description will be given of the functional block configuration of the wireless communication system 10. Specifically, the functional block configurations of the gNB 100 and the UE 200 will be described.

[0025] Fig. 2 is a functional block diagram of the gNB100. Fig. 3 is a functional block diagram of the UE200. Note that Figs. 2 and 3 only show main functional blocks relevant to the description of the embodiments, and that the gNB100 and UE200 have other functional blocks (e.g., a power supply unit, etc.). Figs. 2 and 3 show functional block configurations of the gNB100 and UE200, and for the hardware configuration, please refer to Fig. 8.

[0026] (2.1) gNB100 As shown in FIG. 2, the gNB 100 includes a radio communication unit 110, an RA execution unit 120, a CG processing unit 130, and a control unit 140.

[0027] The wireless communication unit 110 transmits downlink signals (DL signals) conforming to NR, and also receives uplink signals (UL signals) conforming to NR.

[0028] The RA execution unit 120 executes an RA procedure with the UE 200. The RA procedure may simply be interpreted as a random access channel (RACH). The RA procedure (RACH) may include a two-step RACH and a four-step RACH.

[0029] In a two-step RACH, messages (MSG) A and B (Random Access Preamble, Contention Resolution / Random Access Response (RAR)) may be transmitted and received. In a four-step RACH, MSGs 1 to 4 (Random Access Preamble, Random Access Response, Scheduled Transmission, Contention Resolution) may be transmitted and received. The RA procedure may be either a contention type or a contention-free type.

[0030] The channels include a control channel and a data channel. The control channels may include a PDCCH (Physical Downlink Control Channel), a PUCCH (Physical Uplink Control Channel), a RACH (Random Access Channel, which may be Downlink Control Information (DCI) including a Random Access Radio Network Temporary Identifier (RA-RNTI)), a Physical Broadcast Channel (PBCH), etc.

[0031] The data channel includes a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), etc. Data may refer to data transmitted via a data channel.

[0032] Layer 1 may also be interpreted as including lower layers such as the physical layer. Layer 3 is a layer higher than Layer 1. The higher layers may include at least one of a radio link control layer (RLC), a packet data convergence protocol layer (PDCP), and a radio resource control layer (RRC), and a medium access control layer (MAC) may be positioned between the lower layer and the higher layer.

[0033] The CG processing unit 130 executes processing related to a Configured Grant (CG) for the UE 200. Specifically, the CG processing unit 130 may configure an uplink (UL) grant (which may also be referred to as an uplink grant) in the serving cell and instruct the configured grant (CG) to the UE 200. The CG (configured grant) may be transmitted by a message of an upper layer (RRC) or the like.

[0034] The control unit 140 controls each functional block constituting the gNB 100. In particular, in this embodiment, the control unit 140 can execute control of data transmission and reception according to the RRC state of the UE 200.

[0035] Specifically, the control unit 140 may execute control corresponding to data transmission (SDT) from the UE 200 in the RRC INACTIVE state of the UE 200. More specifically, the control unit 140 may execute control related to reception of a small amount of data transmitted from the UE 200 by the SDT.

[0036] (2.2)UE200 As shown in FIG. 3, the UE 200 includes a radio communication unit 210, an RA execution unit 220, an SDT processing unit 230, and a control unit 240.

[0037] The wireless communication unit 210 transmits an uplink signal (UL signal) conforming to NR. The wireless communication unit 210 also receives an uplink signal (DL signal) conforming to NR.

[0038] The RA execution unit 220 executes an RA procedure with the gNB 100. As described above, the RA execution unit 220 may support a two-step RACH and a four-step RACH, and the RA procedure may be either a contention-type or a contention-free type.

[0039] The SDT processing unit 230 performs processing related to Small Data Transmission (SDT). Specifically, the SDT processing unit 230 performs data transmission in the RRC INACTIVE state. The amount of data transmitted at one time may be smaller than the amount of data that can be transmitted in the RRC CONNECTED state.

[0040] The SDT processing unit 230 can perform this data transmission in a state where no SRB and / or DRB is configured. Although such data is normally only possible in the RRC CONNECTED state, the SDT may be interpreted as exceptional data transmission that can be transmitted in the RRC INACTIVE state where no SRB and / or DRB is configured.

[0041] If the SDT fails, the SDT processing unit 230 can transmit a report on the result of the SDT to the network. In this embodiment, the SDT processing unit 230 may constitute a transmitting unit. A specific example of the report may be a RACH report (in the case of a RACH-based SDT) or a Failure report (SDT Failure report) related to the SDT (in the case of a CG-based SDT).

[0042] The SDT processing unit 230 may transmit a report including information indicating the relationship between the quality of the downlink (DL) and a threshold for SDT. Specifically, the SDT processing unit 230 may transmit a report including an indication of whether the Reference Signal Received Power (RSRP) of the DL SSB (SS (Synchronization Signal) / PBCH (Physical Broadcast CHannel) Block) exceeds a threshold for RACH (2-step RACH or 4-step RACH).

[0043] The quality of DL is not limited to SSB, but may be based on other reference signals (RS), or may be based on other quality (such as RSRQ (Reference Signal Received Quality)).

[0044] In the case of SDT according to the RA procedure (RACH based SDT), the SDT processing unit 230 may transmit a report including information indicating whether the RA procedure is associated with the SDT. Specifically, the SDT processing unit 230 may transmit a report (RACH report) including an indication indicating whether the executed RA procedure is associated with the SDT.

[0045] In addition, in the case of RACH-based SDT, the SDT processing unit 230 may transmit a report including information indicating whether or not the SDT is in accordance with the configured permission, specifically, whether or not it is a fallback from the CG-based SDT. Specifically, the SDT processing unit 230 may transmit a report (RACH report) including an indication of whether or not the executed RA procedure is a fallback from the CG-based SDT.

[0046] In the case of CG-based SDT, the SDT processing unit 230 may transmit a report including information indicating that a timer related to the SDT has expired. Specifically, the SDT processing unit 230 may transmit a report (SDT Failure report) including an indication indicating the expiration of an SDT-specific TAT (timeAlignmentTimer).

[0047] The control unit 240 controls each functional block constituting the UE 200. In particular, in this embodiment, the control unit 240 can control the SDT in the RRC INACTIVE state in accordance with the RA procedure or a configured grant from the network.

[0048] Specifically, the control unit 240 can execute an RA procedure for SDT. Furthermore, the control unit 240 can instruct the SDT processing unit 230 on SDT in the RRC INACTIVE state based on CG from the network.

[0049] (3) Operation of the wireless communication system Next, a description will be given of the operation of the wireless communication system 10. Specifically, a description will be given of the operation related to reporting when the RACH-based SDT and the CG-based SDT fail.

[0050] (3.1) Premise As mentioned above, SDT may mean that a UE can transmit and receive small amounts of data while in the RRC INACTIVE state. The use case of SDT targets terminals (UEs) that transmit small amounts of UL data, such as factory sensors or wearable devices. UL data transmission from UE 200 is possible in the RRC CONNECTED state, but in the case of small amounts of data, enabling data transmission in the RRC INACTIVE state is expected to reduce the power consumption of UE 200.

[0051] The wireless communication system 10 may also have a function of Self-Organizing Networks (SON) that supports SDT. Specifically, the wireless communication system 10 may be able to optimize network settings based on reports related to SDT.

[0052] Fig. 4 shows an example of a sequence of RACH-based SDT, and Fig. 5 shows an example of a sequence of CG-based SDT.

[0053] As shown in FIG. 4, in the RACH based SDT, if the amount of new UL data is less than a threshold, the UE 200 may start an RA procedure in the RRC INACTIVE state and transmit the UL data (SDT) when transmitting MSG 3.

[0054] 5, in the CG-based SDT, the UE 200 may receive the CG config and then transition to the RRC INACTIVE state. If the amount of new UL data is less than a threshold, the UE 200 may transmit the UL data (SDT) together with the RRCResemeRequest in the RRC INACTIVE state.

[0055] (3.2) Example of operation An example of an operation related to a report when the UE 200 fails in the SDT will be described below.

[0056] (3.2.1)RACH based SDT 6 shows an example of a sequence in the case where RACH-based SDT fails, which corresponds to the example of the sequence in FIG.

[0057] If the RACH based SDT fails, the UE 200 may include at least one of the following information in a RACH report to report it to the network:

[0058] Indication to identify whether it is RACH-based SDT or not Indication of whether the DL SSB RSRP has exceeded the threshold for the 4-step RACH or the threshold for the 2-step RACH (the threshold may be dedicated to SDT or may be shared with the normal RACH other than SDT) -Indication of whether RACH based SDT is a fallback from CG based SDT In addition, in the SDT type selection step, if none of the RSRPs of the SSBs exceeds the RSRP threshold for the CG-based SDT, the UE 200 may select the RACH-based SDT if the criteria for the RACH-based SDT are met.

[0059] Non-SDT based RACH, i.e., if the RACH is not for SDT purposes, indicates whether it is a fallback from CG based SDT or RACH based SDT. Specifically, the following indications may be included:

[0060] Whether or not a fallback instruction was received from the network via RAR when falling back to a non-SDT RACH Indicates that the number of failed UL transmissions (by MSG A or MSG 3) exceeded a predetermined threshold and fell back from SDT to non-SDT. Indication of the RACH resource used in RACH-based SDT (initial BWP (Bandwidth part) or SDT-specific BWP, or non-SDT RACH resource or SDT-specific RACH resource) In RACH-based SDT, an indication of whether RACH is performed in NUL (Normal UL) or SUL (Supplemental UL), or whether DL SSB RSRP exceeds a specific carrier selection threshold (NUL or SUL) 6, the UE 200 may transmit a RACH report including the above-described indication to the network (gNB 100). The RACH report may be included in, for example, RRCSetupComplete or UEInformationResponse.

[0061] (3.2.2) CG-based SDT Fig. 7 shows an example of a sequence when CG-based SDT fails, which corresponds to the example of the sequence in Fig. 5.

[0062] When the CG based SDT fails, the UE 200 may include at least one of the following information in an SDT Failure report and report it to the network. Note that the SDT Failure report may be reported to the network in the next RRC CONNECTED state.

[0063] -Indication that DL SSB RSRP has fallen below the SDT specific threshold -Indication of expiration of SDT specific TAT (timeAlignmentTimer) - Display indicating expiration of SDT failure detection timer -Indication that the number of UL transmission failures (due to CG resource) has exceeded a predetermined threshold SDT failure due to cell reselection ·Display indicating RLC retransmission exceeded (Max retransmission is reached in RLC) -Indication that UL resource (CG resource) is unavailable The SDT failure detection timer may be set as follows.

[0064] Started by the first SDT Stops due to any of the following: Reception of RRCResume Reception of RRCSetup Reception of RRCRelease ·Reception of RRCRelease with SuspendConfig Reception of RRCReject Cell reselection ·Abortion of connection establishment by upper layers If the timer expires, the UE 200 may perform the operation specified in 3GPP TS 38.331, chapter 5.3.13.5 (transition to IDLE as per legacy T319 timer) and attempt RRC connection setup.

[0065] 7, the UE 200 may transmit an SDT Failure report including the above-mentioned indication to the network (gNB 100). The SDT Failure report may be included in, for example, RRCSetupComplete or UEInformationResponse.

[0066] (4) Actions and Effects According to the above-described embodiment, the following advantageous effects can be obtained: Specifically, when SDT using RACH-based SDT or CG-based SDT fails, the UE 200 can transmit a report on the result of the SDT to the network.

[0067] Therefore, the network can quickly and reliably recognize the state of the SDT, such as a failure of the SDT. This can be useful for analyzing the cause of the SDT failure and optimizing parameters related to the SDT. That is, the network can optimize network settings, i.e., realize SON related to the SDT, based on the report on the SDT from the UE 200.

[0068] In this embodiment, the UE 200 can report detailed information such as the quality of the RACH-based SDT or the CG-based SDT, whether or not a fallback is performed, etc. This allows the network to set more appropriate parameters for the SDT.

[0069] (5) Other embodiments Although the embodiments have been described above, it will be obvious to those skilled in the art that the present invention is not limited to the description of the embodiments and that various modifications and improvements are possible.

[0070] For example, in the above-described embodiments, a RACH-based SDT or a CG-based SDT has been described, but the SDT does not necessarily have to be based on the RACH or CG. Also, the SDT is a provisional name and may be called by another name.

[0071] Also, in the above description, "configure," "activate," "update," "indicate," "enable," "specify," and "select" may be interchangeable. Similarly, "link," "associate," "correspond," and "map" may be interchangeable, and "allocate," "assign," "monitor," and "map" may also be interchangeable.

[0072] Furthermore, specific, dedicated, UE-specific, and UE-dedicated may be interchangeable. Similarly, common, shared, group-common, UE-common, and UE-shared may be interchangeable.

[0073] In the present disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," etc. may be used interchangeably.

[0074] Furthermore, the block diagrams (FIGS. 2 and 3) used in the description of the above-described embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are connected directly or indirectly (for example, by wire, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining the single device or multiple devices with software.

[0075] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how each is implemented.

[0076] Furthermore, the above-described gNB100 and UE200 (the device) may function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 8 is a diagram showing an example of the hardware configuration of the device. As shown in Figure 8, the device may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0077] In the following description, the term "apparatus" can be interpreted as a circuit, a device, a unit, etc. The hardware configuration of the apparatus may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0078] Each functional block of the device (see Figure 2.3) is realized by any hardware element of the computer device or a combination of the hardware elements.

[0079] In addition, each function of the device is realized by loading specified software (programs) onto hardware such as processor 1001 and memory 1002, causing processor 1001 to perform calculations, control communication via communication device 1004, and control at least one of reading and writing data in memory 1002 and storage 1003.

[0080] The processor 1001 controls the entire computer by running, for example, an operating system, and may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control unit, an arithmetic unit, a register, and the like.

[0081] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-mentioned embodiments. Furthermore, the various processes described above may be executed by one processor 1001, or may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0082] The memory 1002 is a computer-readable recording medium and may be configured by, for example, at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The memory 1002 may also be called a register, a cache, a main memory (primary storage device), etc. The memory 1002 can store a program (program code), a software module, etc., that can execute a method according to an embodiment of the present disclosure.

[0083] Storage 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. Storage 1003 may also be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, a database, a server, or other appropriate medium including at least one of memory 1002 and storage 1003.

[0084] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, or a communication module.

[0085] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize, for example, at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0086] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0087] Furthermore, each device such as the processor 1001 and the memory 1002 is connected to a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0088] Furthermore, the device may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0089] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB))), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0090] Each aspect / embodiment described in the present disclosure may be applied to at least one of a system using Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, a 4th generation mobile communication system (4G), a 5th generation mobile communication system (5G), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable system, and a next-generation system extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A and 5G) may also be applied.

[0091] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0092] In the present disclosure, a specific operation described as being performed by a base station may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal may be performed by at least one of the base station and another network node other than the base station (for example, an MME or an S-GW, etc., but are not limited to these). Although the above example illustrates a case where there is one other network node other than the base station, a combination of multiple other network nodes (for example, an MME and an S-GW) may also be used.

[0093] Information, signals (information, etc.) may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0094] The input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. The input and output information may be overwritten, updated, or added to. The output information may be deleted. The input information may be sent to another device.

[0095] The determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0096] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0097] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0098] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0099] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0100] Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0101] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0102] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or other corresponding information. For example, a radio resource may be indicated by an index.

[0103] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0104] In this disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0105] A base station can accommodate one or more (e.g., three) cells (also called sectors). When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0106] The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication services within that coverage area.

[0107] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0108] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0109] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile object, or the mobile object itself. The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0110] Furthermore, a base station in the present disclosure may be read as a mobile station (user terminal, the same applies hereinafter). For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a mobile station is replaced with communication between multiple mobile stations (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the mobile station may be configured to have the functions of a base station. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, terms such as uplink channel and downlink channel may be read as side channel.

[0111] Similarly, a mobile station in the present disclosure may be interpreted as a base station, in which case the base station may have the functions of a mobile station. A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0112] Numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by a transceiver in the frequency domain, and specific windowing operations performed by a transceiver in the time domain.

[0113] A slot may consist of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) A slot may be a numerology-based time unit.

[0114] A slot may include multiple minislots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0115] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0116] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0117] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. However, the definition of TTI is not limited to this.

[0118] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0119] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0120] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0121] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0122] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0123] The time domain of an RB may include one or more symbols and may be one slot, one minislot, one subframe, or one TTI in length. Each TTI, subframe, etc. may be composed of one or more resource blocks.

[0124] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0125] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0126] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0127] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0128] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0129] The above-described structures of the radio frame, subframe, slot, minislot, and symbol are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

[0130] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0131] The reference signal may also be abbreviated as Reference Signal (RS), and may also be called a pilot depending on the applicable standard.

[0132] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0133] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0134] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed therein or that the first element must precede the second element in some way.

[0135] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0136] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0137] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0138] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0139] 9 shows an example of the configuration of a vehicle 2001. As shown in Fig. 9, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013.

[0140] The drive unit 2002 is composed of, for example, an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a handle), and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user. The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals are input to the electronic control unit 2010 from various sensors 2021 to 2027 provided in the vehicle. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0141] The signals from the various sensors 2021 to 2028 include a current signal from a current sensor 2021 that senses the current of the motor, a rotation speed signal of the front and rear wheels obtained by a rotation speed sensor 2022, an air pressure signal of the front and rear wheels obtained by an air pressure sensor 2023, a vehicle speed signal obtained by a vehicle speed sensor 2024, an acceleration signal obtained by an acceleration sensor 2025, an accelerator pedal depression amount signal obtained by an accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by a brake pedal sensor 2026, a shift lever operation signal obtained by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 2028.

[0142] The information service unit 2012 is composed of various devices, such as a car navigation system, an audio system, speakers, a television, and a radio, for providing various types of information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 2012 uses information obtained from external devices via the communication module 2013, etc., to provide various types of multimedia information and multimedia services to the occupants of the vehicle 1.

[0143] The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driver's driving burden, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS, etc.), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 2030 also transmits and receives various information via the communication module 2013 to realize driving assistance functions or autonomous driving functions.

[0144] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 1 via the communication port. For example, the communication module 2013 transmits and receives data via the communication port 2033 to and from a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, an axle 2009, a microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 2028, which are provided in the vehicle 2001.

[0145] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station, a mobile station, or the like.

[0146] The communication module 2013 transmits, via wireless communication to an external device, a current signal from the current sensor that is input to the electronic control unit 2010. The communication module 2013 also transmits, via wireless communication to an external device, the rotation speed signals of the front and rear wheels acquired by a rotation speed sensor 2022, the air pressure signals of the front and rear wheels acquired by an air pressure sensor 2023, the vehicle speed signal acquired by a vehicle speed sensor 2024, the acceleration signal acquired by an acceleration sensor 2025, the accelerator pedal depression amount signal acquired by an accelerator pedal sensor 2029, the brake pedal depression amount signal acquired by a brake pedal sensor 2026, the shift lever operation signal acquired by a shift lever sensor 2027, and the detection signals for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 2028, all of which are input to the electronic control unit 2010.

[0147] The communication module 2013 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from external devices and displays it on an information service unit 2012 provided in the vehicle. The communication module 2013 also stores the various information received from the external devices in a memory 2032 that can be used by the microprocessor 2031. Based on the information stored in the memory 2032, the microprocessor 2031 may control a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, an axle 2009, sensors 2021 to 2028, and the like provided in the vehicle 2001.

[0148] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. [Explanation of symbols]

[0149] 10. Wireless communication systems 20 NG-RAN 100 gNB 110 Radio Communication Department 120 RA Executive Department 130 CG Processing Department 140 Control Unit 200 UE 210 Radio Communication Department 220 RA Executive Department 230 SDT processing section 240 Control Unit 1001 processor 1002 memory 1003 Storage 1004 Communication equipment 1005 Input Device 1006 Output Device 1007 Bus 2001 Vehicle 2002 Drive unit 2003 Steering Section 2004 accelerator pedal 2005 brake pedal 2006 Shift Lever 2007 Left and right front wheels 2008 Left and right rear wheels 2009 Axle 2010 Electronic Control Unit 2012 Information Services Department 2013 Communication Module 2021 Current Sensor 2022 RPM Sensor 2023 Air Pressure Sensor 2024 Vehicle speed sensor 2025 Acceleration Sensor 2026 Brake pedal sensor 2027 Shift lever sensor 2028 Object Detection Sensor 2029 Accelerator pedal sensor 2030 Driving Assistance Systems Department 2031 microprocessor 2032 memory (ROM, RAM) 2033 communication port

Claims

1. a control unit that performs data transmission in an inactive state; a transmitting unit that transmits information indicating a reason for the failure of the data transmission; A terminal comprising:

2. the information includes an indication of expiration of a timer for detecting failure of the data transmission; The terminal according to claim 1 .

3. The timer is stopped when any of an RRCResume message, an RRCSetup message, an RRCRelease message, and an RRCReject message is received. The terminal according to claim 2.

4. the information includes an indication of excess retransmissions of the RLC layer; The terminal according to claim 1 .

5. the information includes an indication that a number of uplink transmissions of the random access procedure exceeds a threshold. The terminal according to claim 1 .

6. the information includes an indication of expiration of a TimeAlignmentTimer for the data transmission; The terminal according to claim 1 .

7. A terminal and a base station are provided, The terminal a control unit that performs data transmission in an inactive state; a transmitting unit that transmits information indicating a reason for the failure of the data transmission; Equipped with Wireless communication system.

8. A wireless communication method performed by a terminal, Send data during inactivity, transmitting information indicating the reason for the failure of said data transmission; Wireless communication method.

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