Terminal and wireless communication method

Abstract

This terminal controls, in accordance with a random access procedure, data transmission in a state where a radio resource control layer is inactive. When the data transmission has failed, the terminal transmits to a network a report relating to the result of the data transmission.

Description

Terminal and wireless communication method

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

[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 the 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) during such an inactive state, and is also studying Self-Organizing Networks (SON) that support SDT (Non-Patent Document 1).

[0005] "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

[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) that includes 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.

[0010] FIG. 1 is a diagram showing an overall schematic configuration of a wireless communication system 10. FIG. 2 is a functional block configuration diagram of a gNB 100. FIG. 3 is a functional block configuration diagram of a UE 200. FIG. 4 is a diagram showing an example of a sequence of a RACH-based SDT. FIG. 5 is a diagram showing an example of a sequence of a CG-based SDT. FIG. 6 is a diagram showing an example of a sequence when a RACH-based SDT fails. FIG. 7 is a diagram showing an example of a sequence when a CG-based SDT fails. FIG. 8 is a diagram showing an example of the hardware configuration of a gNB 100 and a UE 200. FIG. 9 is a diagram showing an example of the configuration of a vehicle 2001.

[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 Schematic Configuration of Wireless Communication System Fig. 1 is a diagram showing the overall schematic 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. 1 .

[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 also 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 aggregates 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, which may also be called a configured permission) from the network (Configured Grant (CG) based SDT).

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

[0025] Figure 2 is a functional block diagram of the gNB100. Figure 3 is a functional block diagram of the UE200. Note that Figures 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.). Figures 2 and 3 show functional block configurations of the gNB100 and UE200, and for the hardware configuration, please refer to Figure 8.

[0026] (2.1) gNB100 As shown in FIG. 2, the gNB100 includes a wireless 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 contention-based or contention-free.

[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) and 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 performs 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) UE 200 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 executor 220 executes an RA procedure with the gNB 100. As described above, the RA executor 220 may support a two-step RACH and a four-step RACH, and the RA procedure may be either a contention-based 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 DL quality 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) Assumptions 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 Self-Organizing Networks (SON) function 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 for RACH-based SDT, and Fig. 5 shows an example of a sequence for 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 initiate 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 UL data (SDT) together with an RRCResemeRequest in the RRC INACTIVE state.

[0055] (3.2) Example of Operation Below, an example of operation regarding reporting when the UE 200 fails in SDT will be described.

[0056] (3.2.1) RACH-based SDT Figure 6 shows an example of a sequence when RACH-based SDT fails. Figure 6 corresponds to the example of the sequence in Figure 4.

[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 a RACH-based SDT - Indication to indicate whether the DL SSB RSRP has exceeded the threshold for 4-step RACH or the threshold for 2-step RACH (the threshold may be dedicated to SDT or may be shared with normal RACH other than SDT) - Indication to indicate whether the RACH-based SDT is a fallback from the CG-based SDT Note that, in the SDT type selection stage, if none of the SSB RSRPs exceed the RSRP threshold for the CG-based SDT, the UE200 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 intended for SDT, an indication indicating whether it is a fallback from CG based SDT or RACH based SDT. Specifically, the following indications may be included:

[0060] Whether a fallback instruction was received from the network via RAR when falling back to non-SDT RACH; An indication indicating that the number of UL transmission failures (by MSG A or MSG 3) exceeded a predetermined threshold and that fallback occurred from SDT to non-SDT; An indication indicating the RACH resource (initial BWP (Bandwidth part) or SDT specific BWP, or non-SDT RACH resource or SDT specific RACH resource) used in the RACH based SDT; An indication indicating whether RACH was performed in NUL (Normal UL) or SUL (Supplemental UL) in the RACH based SDT, or an indication indicating whether DL SSB RSRP exceeded a specific carrier selection threshold (NUL or SUL). As shown in FIG. 6 , the UE 200 may transmit a RACH report including the above-mentioned indications to the network (gNB 100). The RACH report may be included in, for example, RRCSetupComplete or UEInformationResponse.

[0061] (3.2.2) CG-based SDT Figure 7 shows an example of a sequence when CG-based SDT fails. Figure 7 corresponds to the example of the sequence in Figure 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 threshold (SDT specific threshold) - Indication that SDT specific TAT (timeAlignmentTimer) has expired - Indication that SDT failure detection timer has expired - Indication that the number of UL transmission (due to CG resource) failures has exceeded a specified threshold - SDT failure due to Cell reselection - Indication that RLC retransmissions have exceeded (Max retransmission is reached in RLC) - Indication that UL resource shortage (UL resource (CG resource) is unavailable) The SDT failure detection timer may be set as follows.

[0064] - Activated by the first SDT - Deactivated by 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 it expires, UE200 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] As shown in Fig. 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 actions and effects can be obtained. Specifically, when SDT using RACH-based SDT or CG-based SDT fails, 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 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 hardware and / or software. Furthermore, the method for 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 directly or indirectly connected (e.g., wired, wireless, etc.) and these multiple devices. The functional block may also be realized by combining software with the single device or multiple devices.

[0075] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, 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 devices) 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 devices. As shown in Figure 8, the devices 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, and registers.

[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-described embodiments. Furthermore, the various processes described above may be executed by a single 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 at least one of, for example, 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 may store a program (program code), a software module, etc., capable of executing 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 suitable 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 (e.g., 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 (e.g., a display, a speaker, an LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., 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 enhanced 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 (e.g., MME or 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 (e.g., MME and 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 and output via multiple network nodes.

[0094] The input and output information may be stored in a specific location (for example, a memory) or may be managed using a management table. The input and output information may be overwritten, updated, or added. The output information may be deleted. The input information may be transmitted 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] The aspects / embodiments described in this disclosure may be used alone, in combination, or switched depending on the implementation. Notification of predetermined information (e.g., notification that "X is true") is not limited to explicit notification, but may be implicit (e.g., 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 described 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, may be expressed using relative values ​​from a predetermined value, or may be expressed using 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 referred to as 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, the mobile object itself, etc. 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 terminal-to-terminal communication (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0111] Similarly, a mobile station in the present disclosure may be interpreted as a base station. In this case, the base station may be configured to 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 communication parameters that apply to the transmission and / or 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 the transceiver in the frequency domain, and specific windowing operations performed by the 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 multiple 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 referred to as a transmission time interval (TTI), multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as 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 schedules each user terminal to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) in TTI units. Note that 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] In addition, 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, and 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 referred to as 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 referred to as 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 the 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 be determined based on numerology.

[0123] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI, each of which may consist 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, etc.

[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 predetermined 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 may 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 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 the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it 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, memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals from various sensors 2021 to 2027 provided in the vehicle are input to the electronic control unit 2010. 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 driving 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 the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, 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.

[0149] 10 Wireless communication system 20 NG-RAN 100 gNB 110 Wireless communication unit 120 RA execution unit 130 CG processing unit 140 Control unit 200 UE 210 Wireless communication unit 220 RA execution unit 230 SDT processing unit 240 Control unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus 2001 Vehicle 2002 Drive unit 2003 Steering unit 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 service unit 2013 Communication module 2021 Current sensor 2022 Rotation speed 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 system section 2031 Microprocessor 2032 Memory (ROM, RAM) 2033 Communication port

Claims

1. A control unit for initiating a random access procedure involving data transmission in an inactive state of a radio resource control layer; a transmission unit that transmits, when the data transmission fails, information indicating a failure of the data transmission in the random access procedure to a base station; A terminal comprising:

2. The transmitter transmits information indicating a relationship between a downlink quality and the threshold for data transmission. The terminal according to claim 1.

3. The transmitting unit transmits information indicating whether the random access procedure has been initiated for the data transmission. The terminal according to claim 1.

4. Initiating a random access procedure involving data transmission in an inactive state of a radio resource control layer; If the data transmission fails, transmitting information indicating a failure of the data transmission in the random access procedure to a base station; A wireless communication method comprising:

5. A wireless communication system including a terminal and a base station, The terminal includes: a control unit for initiating a random access procedure involving data transmission in an inactive state of a radio resource control layer; a transmission unit that transmits, when the data transmission fails, information indicating a failure of the data transmission in the random access procedure to the base station; Equipped with Wireless communication system.