Terminal and Communication Method

Abstract

Provided is a terminal including: a reception unit that performs monitoring of paging transmitted from a base station; a control unit that does not perform the monitoring of the paging when the terminal has transitioned to a radio resource control (RRC) idle mode or an RRC inactive mode and the type of the terminal is a specific type; and a transmission unit that performs uplink transmission to the base station. The specific type indicates a device that performs only uplink transmission, a device that performs periodic uplink transmission, or a device that tolerates a downlink delay greater than normal.

Description

Technical Field

[0001] The present invention relates to a terminal and a communication method in a wireless communication system.

Background Art

[0002] In 3GPP (3rd Generation Partnership Project), in order to achieve further increase in system capacity, further increase in data transmission speed, further reduction in latency in the radio section, etc., a wireless communication method called 5G or NR (New Radio) (hereinafter, this wireless communication method is referred to as "NR") is being studied. In 5G, in order to meet the requirement of achieving a throughput of 10 Gbps or more and reducing the latency in the radio section to 1 ms or less, various wireless technologies and network architectures are being studied (for example, Non-Patent Document 1).

[0003] In addition, studies on future systems or 6G beyond 5G have been started. In such future systems, further improvement in communication performance and diversification of use cases are assumed.

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In conventional NR, terminals in the idle / non-active mode need to periodically perform paging monitoring, and even when no data transmission / reception is performed at all, sufficient reduction of transmission power could not be achieved.

[0006] The present invention has been made in view of the above points, and an object thereof is to efficiently execute paging monitoring in a wireless communication system.

Means for Solving the Problems

[0007] According to the disclosed technique, there is provided a receiving unit that executes paging monitoring transmitted from a base station, a control unit that does not execute paging monitoring when transitioning to the RRC (Radio Resource Control) idle mode or the RRC inactive mode and when the type of the own device is a specific type, and a transmitting unit that performs uplink transmission to the base station, wherein the specific type is a device that performs only uplink transmission, a device that performs periodic uplink transmission, or a terminal that allows a larger downlink delay than normal.

Effects of the Invention

[0008] According to the disclosed technique, paging monitoring can be efficiently executed in a wireless communication system.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below are examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

[0011] In the operation of the wireless communication system according to the embodiment of the present invention, existing technologies are appropriately used. However, the existing technology is, for example, existing LTE, but is not limited to existing LTE. In addition, the term "LTE" used in this specification shall have a broad meaning including LTE-Advanced and systems after LTE-Advanced (e.g., NR) unless otherwise specified.

[0012] In addition, in the embodiments of the present invention described below, terms such as SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), and PUSCH (Physical Uplink Shared Channel) that are used in existing LTE are used. This is for the convenience of description, and signals, functions, etc. similar to these may be called by other names. Also, the above-mentioned terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even for signals used in NR, it is not always necessary to clearly indicate "NR-".

[0013] In addition, in the embodiments of the present invention, the duplex mode may be a TDD (Time Division Duplex) mode, an FDD (Frequency Division Duplex) mode, or another mode (for example, Flexible Duplex, etc.).

[0014] In addition, in the embodiments of the present invention, that a radio parameter or the like is "configured" may mean that a predetermined value is pre-configured, or that a radio parameter notified from the base station 10 or the terminal 20 is configured.

[0015] FIG. 1 is a diagram for explaining a wireless communication system in the embodiments of the present invention. The wireless communication system in the embodiments of the present invention includes a base station 10 and a terminal 20 as shown in FIG. 1. Although one base station 10 and one terminal 20 are shown in FIG. 1, this is an example, and there may be a plurality of each.

[0016] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of the wireless signal are defined in the time domain and the frequency domain. The time domain may be defined by the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. Also, the TTI (Transmission Time Interval) in the time domain may be a slot or a sub-slot, or the TTI may be a sub-frame.

[0017] The base station 10 is capable of performing carrier aggregation in which a plurality of cells (a plurality of CCs (Component Carriers)) are bundled to communicate with the terminal 20. In carrier aggregation, one primary cell (PCell, Primary Cell) and one or more secondary cells (SCell, Secondary Cell) are used.

[0018] The base station 10 transmits synchronization signals and system information, etc. to the terminal 20. The synchronization signals are, for example, NR-PSS and NR-SSS. The system information is transmitted, for example, by NR-PBCH or PDSCH, and is also referred to as broadcast information. As shown in FIG. 1, the base station 10 transmits control signals or data to the terminal 20 in the DL (Downlink) and receives control signals or data from the terminal 20 in the UL (Uplink). Here, what is transmitted on control channels such as PUCCH and PDCCH is called a control signal, and what is transmitted on shared channels such as PUSCH and PDSCH is called data, but such a naming method is just an example.

[0019] The terminal 20 is a communication device equipped with a wireless communication function such as a smartphone, a mobile phone, a tablet, a wearable terminal, and a communication module for M2M (Machine-to-Machine). As shown in FIG. 1, the terminal 20 receives a control signal or data from the base station 10 in the DL and transmits a control signal or data to the base station 10 in the UL, thereby using various communication services provided by the wireless communication system. Note that the terminal 20 may be referred to as a UE, and the base station 10 may be referred to as a gNB.

[0020] The terminal 20 is capable of performing carrier aggregation in which a plurality of cells (a plurality of CCs) are bundled to communicate with the base station 10. In carrier aggregation, one primary cell and one or more secondary cells are used. Also, a PUCCH-SCell having a PUCCH may be used.

[0021] Here, studies on a system in the future beyond 5G or 6G have been started. In the future system, further improvement in communication performance and diversification of use cases are assumed. In the conventional NR, a terminal in the idle / inactive mode needs to periodically perform paging monitoring, and even when no data transmission / reception is performed at all, sufficient transmission power cannot be reduced.

[0022] Therefore, in a system in the future beyond 5G or 6G, for example, for various use cases such as a device mainly performing UL transmission, power consumption may be reduced by reducing paging monitoring.

[0023] The idle / inactive mode terminal 20 may not perform paging monitoring based on the device type or use case. Note that the idle / inactive mode terminal 20 may be a terminal 20 transitioning to the idle mode and a terminal 20 transitioning to the inactive mode, or may be a terminal 20 transitioning to the idle mode or a terminal 20 transitioning to the inactive mode. Hereinafter, "not performing monitoring" may be replaced with "reducing monitoring" or "not performing part of the monitoring".

[0024] For example, UE capabilities, UE categories, or UE types as shown in 1)-3) below are defined, and the terminal 20 may notify the network of information indicating which one it is. Also, information indicating traffic corresponding to use cases as shown in 1)-3) below (for example, QoS information, network slicing, etc.) may be defined.

[0025] 1) A device mainly performing UL data transmission 2) A device performing periodic UL transmission 3) A device performing communication allowing a larger downlink delay than normal

[0026] Also, the idle / inactive mode terminal 20 may not perform paging monitoring based on a predetermined condition or notification. For example, the terminal 20 corresponding to the use cases as shown in 1)-3) above may not perform paging monitoring. Whether not performing paging monitoring is applicable to the terminal 20 corresponding to any UE capability, UE category, or UE type may be defined in the specification or notified from the network.

[0027] For example, the terminal 20 may not perform paging monitoring based on a notification from the network. For example, the notification may be an RRC message (such as an RRC connection release message), a MAC-CE, a DCI, etc. Further, the notification may be a paging DCI, a paging message, a paging early indication, a wake-up signal, an SIB, an MIB, etc. The network may send the notification to the terminal 20 based on the UE capabilities, UE category, UE type, or use case as described in 1)-3) above, or may send the notification to the terminal 20 based on the network implementation.

[0028] FIG. 2 is a diagram showing an example (1) of monitoring in an embodiment of the present invention. As shown in FIG. 2, the terminal 20 may receive DL transmission, SI (System Information) update, ETWS (Earthquake and Tsunami Warning System) reception, ACK transmission, etc. in the periods before and after UL transmission along with the generation of UL transmission data. The terminal 20 may not perform monitoring outside of the said period. UL transmission may be transmitting a scheduling request, a preamble or a message during random access, PUSCH / PUCCH, or PUSCH by a configured grant.

[0029] As shown in 1)-3) below, the terminal 20 may receive DL.

[0030] 1) PDSCH etc. may be received based on scheduling by PDCCH. The search space set and CORESET (Control resource set) may be those for normal communication or dedicated ones. Alternatively, a resource or method etc. for monitoring PDCCH may be set without using the search space set and CORESET. It may be specified in advance or notified from the network at what timing close to UL transmission to receive PDCCH. For example, the timing closest before and after UL transmission, the timing closest after UL transmission, the timing within X symbols or X slots from UL transmission etc. may be notified or specified.

[0031] 2) Periodic PDSCH or SPS (Semi Persistent Scheduling) PDSCH etc. set in advance may be received. It may be specified in advance or notified from the network at what timing of PDSCH close to UL transmission to receive. For example, the timing closest before and after UL transmission, the timing closest after UL transmission, the timing within X symbols or X slots from UL transmission etc. may be notified or specified.

[0032] 3) The network may notify or specify at which position before and after UL transmission to perform DL reception (PDSCH / PDCCH etc.). For example, the relative position in the time domain from the first occurring UL transmission, the relative position in the time domain from the UL transmission of a certain channel or a certain signal etc. may be notified or specified by the network.

[0033] FIG. 3 is a diagram showing an example (2) of monitoring in the embodiment of the present invention. As shown in FIG. 3, the terminal 20 may skip paging monitoring based on the execution of UL transmission. For example, if the terminal 20 has performed UL or DL communication during a recent certain period, it may skip paging monitoring. For example, the terminal 20 may execute paging monitoring only when it has not performed UL or DL communication for a certain period. As shown in FIG. 3, start a UL transmission execution timer, and do not execute paging monitoring while the timer is running. After the timer expires, paging monitoring may be executed.

[0034] FIG. 4 is a diagram showing an example (3) of monitoring in the embodiment of the present invention. As shown in FIG. 4, after UL transmission, DL monitoring or reception including paging may be executed during a notified or specified period. As shown in FIG. 4, start a timer from the UL transmission time point or the end time point of the notified or specified period, and do not execute paging monitoring while the timer is running. After the timer expires, paging monitoring may be executed. The notified or specified period may be a period in which the period (for example, X slots) is notified or specified, or may be a period until a certain DL monitoring or reception or a specific DL monitoring or reception (for example, PDCCH monitoring, PDSCH reception, etc.).

[0035] FIG. 5 is a sequence diagram showing an example of monitoring in the embodiment of the present invention. In the method of reducing the above-described paging monitoring, when the UL transmission cannot be normally received on the network side, there may be a case where subsequent DL transmission / reception or paging transmission / reception cannot be appropriately executed. Therefore, as shown in FIG. 5, after the UL transmission in step S11, in the subsequent step S12, information indicating whether the UL transmission has been normally received may be transmitted from the base station 10 to the terminal 20.

[0036] FIG. 6 is a diagram showing an example (4) of monitoring in the embodiment of the present invention. As shown in FIG. 6, in DL transmission, an ACK and / or NACK corresponding to UL transmission may be transmitted. Alternatively, whether the previous UL transmission was successfully received may be notified depending on whether DL reception has occurred. For example, if UL transmission and reception were successful, DL transmission is always executed, and if UL transmission and reception failed, DL transmission may not be executed. Or, whether the previous UL transmission was successfully received may be implicitly notified by a part of the information transmitted in DL.

[0037] When the terminal 20 is notified that the UL transmission has not been successfully received, the terminal 20 may execute UL transmission again. The timer in FIG. 3 or FIG. 4 may be started at the time of retransmission of UL transmission.

[0038] Note that whether the above-described embodiment is applied may be notified to the terminal 20 by RRC signaling, MAC-CE, DCI, or the like. Note that a UE capability indicating whether to support some or all of the above-described embodiments may be defined and reported from the terminal 20 to the base station 10. Note that whether the above-described embodiment is applied may be determined based on UE capability, UE category, UE type, traffic type, QoS (Quality of service), or the like.

[0039] According to the above-described embodiment, the terminal 20 can achieve reduction of monitoring by setting whether to execute paging monitoring according to the device type, UE capability, or use case. Further, the terminal 20 can achieve reduction of monitoring by setting whether to execute paging monitoring based on the timing of UL transmission.

[0040] That is, in a radio communication system, paging monitoring can be efficiently executed.

[0041] (Device Configuration) Next, a functional configuration example of the base station 10 and the terminal 20 that execute the processes and operations described so far will be described. The base station 10 and the terminal 20 include functions for executing the above-described embodiments. However, the base station 10 and the terminal 20 may each be provided with only any one of the functions of the embodiments.

[0042] <Base Station 10> FIG. 7 is a diagram showing an example of the functional configuration of the base station 10. As shown in FIG. 7, the base station 10 includes a transmission unit 110, a reception unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in FIG. 7 is merely an example. As long as the operations according to the embodiments of the present invention can be executed, the functional divisions and the names of the functional units may be anything. The transmission unit 110 and the reception unit 120 may be referred to as a communication unit.

[0043] The transmission unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and wirelessly transmitting the signal. The reception unit 120 includes a function of receiving various signals transmitted from the terminal 20 and obtaining information of a higher layer, for example, from the received signals. Further, the transmission unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL data, etc. to the terminal 20. Further, the transmission unit 110 transmits the setting information and the like described in the embodiments.

[0044] The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 in a storage device and reads it out from the storage device as necessary. The control unit 140 performs, for example, resource allocation, control of the entire base station 10, and the like. Note that a functional unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and a functional unit related to signal reception in the control unit 140 may be included in the reception unit 120. Further, the transmission unit 110 and the reception unit 120 may be referred to as a transmitter and a receiver, respectively.

[0045] <Terminal 20> FIG. 8 is a diagram showing an example of the functional configuration of the terminal 20. As shown in FIG. 8, the terminal 20 includes a transmission unit 210, a reception unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in FIG. 8 is merely an example. As long as the operations according to the embodiments of the present invention can be executed, the functional classification and the names of the functional units may be anything. The transmission unit 210 and the reception unit 220 may be referred to as a communication unit.

[0046] The transmission unit 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal. The reception unit 220 wirelessly receives various signals and obtains signals of a higher layer from the received physical layer signals. Also, the transmission unit 210 transmits HARQ-ACK, and the reception unit 220 receives the setting information and the like described in the embodiments.

[0047] The setting unit 230 stores various setting information received from the base station 10 by the reception unit 220 in a storage device and reads it out from the storage device as necessary. Also, the setting unit 230 stores preset setting information. The control unit 240 controls the entire terminal 20. Note that a functional unit related to signal transmission in the control unit 240 may be included in the transmission unit 210, and a functional unit related to signal reception in the control unit 240 may be included in the reception unit 220. Also, the transmission unit 210 and the reception unit 220 may be referred to as a transmitter and a receiver, respectively.

[0048] (Hardware Configuration) The block diagrams (FIGS. 7 and 8) used in the description of the above embodiments show blocks in terms of functions. These functional blocks (constituent parts) are realized by an arbitrary combination of at least one of hardware and software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (for example, using wired, wireless, etc.) connected and realized using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0049] Functions include, but are not limited to, judgment, decision-making, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, regarded as, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), assigning, etc. For example, a functional block (component) that enables transmission is called a transmitting unit or a transmitter. In any case, as described above, the implementation method is not particularly limited.

[0050] For example, the base station 10, the terminal 20, etc. in one embodiment of the present disclosure may function as a computer that performs the processing of the wireless communication method of the present disclosure. FIG. 9 is a diagram showing an example of the hardware configuration of the base station 10 and the terminal 20 according to one embodiment of the present disclosure. Physically, the above-described base station 10 and terminal 20 may be configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0051] In the following description, the term "device" can be read as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without including some devices.

[0052] Each function in the base station 10 and the terminal 20 is realized by causing the processor 1001 to perform operations by loading a predetermined software (program) onto hardware such as the processor 1001 and the storage device 1002, and controlling the communication by the communication device 1004, or controlling at least one of reading and writing data in the storage device 1002 and the auxiliary storage device 1003.

[0053] The processor 1001 controls the entire computer by operating, for example, an operating system. The processor 1001 may be composed of a central processing unit (CPU: Central Processing Unit) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, the above-described control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0054] Further, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes according thereto. As the program, a program for causing a computer to execute at least a part of the operations described in the above-described embodiments is used. For example, the control unit 140 of the base station 10 shown in FIG. 7 may be stored in the storage device 1002 and realized by a control program operating on the processor 1001. Also, for example, the control unit 240 of the terminal 20 shown in FIG. 8 may be stored in the storage device 1002 and realized by a control program operating on the processor 1001. Although it has been described that the above-described various processes are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be mounted by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

[0055] The storage device 1002 is a computer-readable recording medium and may be constituted by at least one of, for example, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The storage device 1002 may be referred to as a register, a cache, a main memory (main storage device), etc. The storage device 1002 can store a program (program code), a software module, etc. executable for implementing the communication method according to an embodiment of the present disclosure.

[0056] The auxiliary storage device 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disc, a digital versatile disc, a Blu-ray (registered trademark) disc), a smart card, a flash memory (for example, a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. The above-described storage medium may be, for example, a database, a server, or other appropriate medium including at least one of the storage device 1002 and the auxiliary storage device 1003.

[0057] The communication device 1004 is hardware (a transceiver device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, a transceiver antenna, an amplifier section, a transceiver section, a transmission line interface, etc. may be implemented by the communication device 1004. The transceiver section may be physically or logically separated into a transmitter section and a receiver section for implementation.

[0058] 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 an external input. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs an output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

[0059] Also, each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using different buses for each device.

[0060] In addition, the base station 10 and the terminal 20 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), a field programmable gate array (FPGA), etc., 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 hardware components.

[0061] FIG. 10 shows a configuration example of the vehicle 2001. As shown in FIG. 10, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, 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. Each aspect / embodiment described in the present disclosure may be applied to a communication device mounted on the vehicle 2001, for example, it may be applied to the communication module 2013.

[0062] 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 handwheel), 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.

[0063] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals from various sensors 2021 to 2029 provided in the vehicle 2001 are input to the electronic control unit 2010. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0064] As signals from various sensors 2021 to 2029, there are a current signal from a current sensor 2021 that senses the current of the motor, a rotational speed signal of the front and rear wheels acquired by a rotational speed sensor 2022, an air pressure signal of the front and rear wheels acquired by an air pressure sensor 2023, a vehicle speed signal acquired by a vehicle speed sensor 2024, an acceleration signal acquired by an acceleration sensor 2025, a depression amount signal of the accelerator pedal acquired by an accelerator pedal sensor 2029, a depression amount signal of the brake pedal acquired by a brake pedal sensor 2026, an operation signal of the shift lever acquired by a shift lever sensor 2027, a detection signal for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 2028, and the like.

[0065] The information service unit 2012 is composed of various devices for providing various information such as driving information, traffic information, and entertainment information, such as a car navigation system, an audio system, a speaker, a television, and a radio, and one or more ECUs for controlling these devices. The information service unit 2012 uses the information acquired from an external device via a communication module 2013 or the like to provide various multimedia information and multimedia services to the passengers of the vehicle 2001.

[0066] The driving assistance system unit 2030 is composed of various devices for providing functions for preventing accidents and reducing the driving load of the driver, such as a millimeter-wave radar, LiDAR (Light Detection and Ranging), a camera, a positioning locator (for example, GNSS, etc.), map information (for example, high-definition (HD) map, autonomous vehicle (AV) map, etc.), a gyro system (for example, IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), an AI (Artificial Intelligence) chip, an AI processor, and one or more ECUs for controlling these devices. In addition, the driving assistance system unit 2030 transmits and receives various information via the communication module 2013 to realize a driving assistance function or an autonomous driving function.

[0067] The communication module 2013 can communicate with the microprocessor 2031 and the components of the vehicle 2001 via a communication port. For example, the communication module 2013 can transmit and receive data with the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, the microprocessor 2031 and memory (ROM, RAM) 2032 within the electronic control unit 2010, and sensors 2021 - 2029 provided in the vehicle 2001 via the communication port 2033.

[0068] 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 can transmit and receive various information via wireless communication with the external device. The communication module 2013 can be either inside or outside the electronic control unit 2010. The external device can be, for example, a base station, a mobile station, etc.

[0069] The communication module 2013 transmits the current signal from the current sensor input to the electronic control unit 2010 to an external device via wireless communication. Also, the communication module 2013 transmits, via wireless communication to an external device, the rotational speed signals of the front and rear wheels acquired by the rotational speed sensor 2022, the air pressure signals of the front and rear wheels acquired by the air pressure sensor 2023, the vehicle speed signal acquired by the vehicle speed sensor 2024, the acceleration signal acquired by the acceleration sensor 2025, the depression amount signal of the accelerator pedal acquired by the accelerator pedal sensor 2029, the depression amount signal of the brake pedal acquired by the brake pedal sensor 2026, the operation signal of the shift lever acquired by the shift lever sensor 2027, and the detection signal for detecting obstacles, vehicles, pedestrians, etc. acquired by the object detection sensor 2028, etc., all of which are input to the electronic control unit 2010.

[0070] The communication module 2013 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device and displays it to the information service unit 2012 provided in the vehicle 2001. Further, the communication module 2013 stores various information received from the external device in the 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, front wheels 2007, rear wheels 2008, axles 2009, sensors 2021 to 2029, etc. provided in the vehicle 2001.

[0071] (Summary of Embodiment) As described above, according to the embodiment of the present invention, there are provided a receiving unit that executes monitoring of paging transmitted from a base station, a control unit that does not execute monitoring of paging when transitioning to the RRC (Radio Resource Control) idle mode or the RRC inactive mode and when the type of the own device is a specific type, and a transmitting unit that performs uplink transmission to the base station, where the specific type is a device that performs only uplink transmission, a device that performs periodic uplink transmission, or a terminal that allows a larger downlink delay than normal.

[0072] With the above configuration, the terminal 20 can achieve reduction of monitoring by setting whether to execute monitoring of paging according to the type of the device, UE capabilities, or use case. Further, the terminal 20 can achieve reduction of monitoring by setting whether to execute monitoring of paging based on the timing of UL transmission. That is, in a wireless communication system, monitoring of paging can be efficiently executed.

[0073] The receiving unit may receive information indicating the specific type from the network. With this configuration, the terminal 20 can achieve reduction of monitoring by setting whether to execute paging monitoring according to the type of device, UE capabilities, or use case.

[0074] The control unit may monitor paging for a period before and after the time when uplink transmission is executed. With this configuration, the terminal 20 can achieve reduction of monitoring by setting whether to execute paging monitoring based on the timing of UL transmission.

[0075] The control unit may not monitor paging for a period from the time when uplink transmission is executed. With this configuration, the terminal 20 can achieve reduction of monitoring by setting whether to execute paging monitoring based on the timing of UL transmission.

[0076] The receiving unit may receive from the base station information indicating whether the uplink transmission transmitted by the transmitting unit to the base station has been successfully received. With this configuration, the terminal 20 can receive from the base station 10 whether the UL transmission and reception has been successful even when the monitoring is reduced.

[0077] Also, according to an embodiment of the present invention, a communication method is provided in which a terminal executes a reception procedure for monitoring paging transmitted from a base station, a control procedure for not executing paging monitoring when transitioning to the RRC (Radio Resource Control) idle mode or the RRC inactive mode and when the type of its own device is a specific type, and a transmission procedure for performing uplink transmission to the base station, and the specific type is a device that performs only uplink transmission, a device that performs periodic uplink transmission, or a device that allows a larger downlink delay than normal.

[0078] With the above configuration, the terminal 20 can achieve reduction of monitoring by setting whether to execute paging monitoring according to the type of device, UE capabilities, or use case. Also, the terminal 20 can achieve reduction of monitoring by setting whether to execute paging monitoring based on the timing of UL transmission. That is, in a wireless communication system, paging monitoring can be efficiently executed.

[0079] (Supplement of the Embodiment) As described above, the embodiments of the present invention have been described. However, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various variations, modifications, alternatives, substitutions, etc. Although specific numerical examples have been used for explanation to facilitate understanding of the invention, unless otherwise specified, those numerical values are merely examples, and any appropriate values may be used. The classification of items in the above description is not essential to the present invention, and matters described in two or more items may be used in combination as needed, or matters described in one item may be applied to matters described in another item (as long as there is no contradiction). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical components. The operations of multiple functional units may be physically performed by one component, or conversely, the operation of one functional unit may be physically performed by multiple components. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as there is no contradiction. For the sake of convenience in explaining the processing, the base station 10 and the terminal 20 have been described using functional block diagrams, but such devices may be realized by hardware, software, or a combination thereof. The software that operates by the processor included in the base station 10 according to the embodiment of the present invention and the software that operates by the processor included in the terminal 20 according to the embodiment of the present invention may be stored in any appropriate storage medium such as random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, register, hard disk drive (HDD), removable disk, CD-ROM, database, server, etc.

[0080] In addition, the notification of information is not limited to the modes / embodiments described in this disclosure, and other methods may be used. For example, the notification of information may be implemented by physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, notification information (MIB (Master Information Block), SIB (System Information Block)), other signals, or combinations thereof. Also, the RRC signaling may be referred to as an RRC message, and for example, it may be an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, etc.

[0081] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (x is, for example, an integer or a decimal), FRA (Future Radio Access), NR (new Radio), New radio access (NX), Future generation radio access (FX), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other appropriate systems, as well as next-generation systems extended, modified, created, and defined based on these. Further, a plurality of systems may be combined (for example, a combination of at least one of LTE and LTE-A and 5G, etc.) and applied.

[0082] The processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this specification may be reordered as long as there is no contradiction. For example, regarding the methods described in the present disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0083] The specific operations assumed to be performed by the base station 10 in this specification may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having the base station 10, various operations performed for communication with the terminal 20 can clearly be performed by at least one of the base station 10 and other network nodes other than the base station 10 (for example, but not limited to, an MME or an S-GW, etc.). Although the case where there is one other network node other than the base station 10 has been exemplified above, the other network node may be a combination of a plurality of other network nodes (for example, an MME and an S-GW).

[0084] The information or signals, etc. described in this disclosure can be output from an upper layer (or a lower layer) to a lower layer (or an upper layer). They may be input and output via a plurality of network nodes.

[0085] The input and output information, etc. may be stored in a specific location (for example, a memory), or may be managed using a management table. The input and output information, etc. can be overwritten, updated, or appended. The output information, etc. may be deleted. The input information, etc. may be transmitted to other devices.

[0086] The determination in this disclosure may be made by a value represented by 1 bit (0 or 1), or may be made by a Boolean value (true or false), or may be made by a numerical comparison (for example, comparison with a predetermined value).

[0087] Software should be broadly construed to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, a hardware description language, or by any other name.

[0088] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cables, fiber optic cables, twisted pairs, digital subscriber line (DSL), etc.) and wireless technologies (such as infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0089] 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., which may be referred to throughout the above description, may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0090] In addition, 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). Also, a signal may be a message. Also, a component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0091] The terms "system" and "network" as used in this disclosure are used interchangeably.

[0092] In addition, the information, parameters, etc. described in this disclosure may be represented using absolute values, relative values from a predetermined value, or another corresponding piece of information. For example, the radio resources may be indicated by an index.

[0093] The names used for the above-described parameters are not limiting names in any way. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in this disclosure. Since various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are not limiting names in any way.

[0094] In this disclosure, terms such as "base station (BS: Base Station)", "radio base station", "base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. The base station may also be referred to by terms such as macro cell, small cell, femto cell, pico cell, etc.

[0095] A base station can accommodate one or more (e.g., three) cells. When the base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to part or all of the coverage area of at least one of the base station and the base station subsystem that provides communication services in this coverage.

[0096] In the present disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" can be used interchangeably.

[0097] 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 appropriate terms.

[0098] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a communication device, etc. Note that at least one of the base station and the mobile station may also be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves without a driver (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanoid or non-humanoid). Note that at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0099] In addition, the base station in the present disclosure may be replaced by a user terminal. For example, for a configuration in which communication between the base station and the user terminal is replaced with communication between a plurality of terminals 20 (which may be referred to as, for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the above-described base station 10 may be configured to be functions of the terminal 20. Further, terms such as "uplink" and "downlink" may be replaced with terms corresponding to inter-terminal communication (for example, "side"). For example, the uplink channel, downlink channel, etc. may be replaced with the side channel.

[0100] Similarly, the user terminal in the present disclosure may be replaced by a base station. In this case, the functions of the above-described user terminal may be configured to be functions of the base station.

[0101] As used in this disclosure, the terms "determining" and "deciding" may encompass a wide variety of operations. "Determining" and "deciding" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), ascertaining, and considering something as having been "determined" or "decided". Also, "determining" and "deciding" may include considering something as having been "determined" or "decided" based on receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting, outputting, accessing (e.g., accessing data in memory), and the like. Further, "determining" and "deciding" may include considering something as having been "determined" or "decided" based on resolving, selecting, choosing, establishing, comparing, and the like. That is, "determining" and "deciding" may include considering something as having been "determined" or "decided" based on performing some operation. Also, "determining (deciding)" may be replaced with "assuming", "expecting", "considering", etc.

[0102] The terms "connected" or "coupled", or any variation thereof, mean any direct or indirect connection or coupling between two or more elements, and can 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 can be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed". As used in this disclosure, two elements can be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables, and printed electrical connections, and also, as some non-limiting and non-exhaustive examples, electromagnetic energy having wavelengths in the radio frequency region, microwave region, and optical (both visible and invisible) region, etc.

[0103] The reference signal can also be abbreviated as RS (Reference Signal), and may be called a Pilot according to the applicable standard.

[0104] As used in this disclosure, the description "based on" does not mean "based only on" unless otherwise specified. In other words, the description "based on" means both "based only on" and "based at least on".

[0105] Any reference to an element using designations such as "first", "second", etc. used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not mean that only two elements can be employed, or that the first element must precede the second element in any form.

[0106] In the configuration of each of the above devices, "means" may be replaced with "section", "circuit", "device", etc.

[0107] In the present disclosure, when terms such as "include", "including" and their variants are used, these terms are intended to be inclusive, similar to the term "comprising". Further, the term "or" used in the present disclosure is not intended to be an exclusive disjunction.

[0108] A wireless 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. The subframe may further be composed of one or more slots in the time domain. The subframe may have a fixed time length (e.g., 1 ms) independent of numerology.

[0109] Numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. Numerology may indicate at least one of, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, wireless frame configuration, specific filtering processing performed by a transceiver in the frequency domain, and specific windowing processing performed by a transceiver in the time domain.

[0110] A slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. The slot may be a time unit based on numerology.

[0111] A slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, a mini-slot may be called a sub-slot. A mini-slot may be composed of a smaller number of symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (or PUSCH) mapping type B.

[0112] A radio frame, a sub-frame, a slot, a mini-slot, and a symbol all represent time units for transmitting signals. A radio frame, a sub-frame, a slot, a mini-slot, and a symbol may each be used with a corresponding alternative name.

[0113] For example, one sub-frame may be called a transmission time interval (TTI), a plurality of consecutive sub-frames may be called a TTI, or one slot or one mini-slot may be called a TTI. That is, at least one of the sub-frame and the TTI may be a sub-frame (1 ms) in the 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, a mini-slot, etc. instead of a sub-frame.

[0114] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as the frequency bandwidth and transmission power that can be used in each terminal 20) to each terminal 20 in TTI units. Note that the definition of the TTI is not limited to this.

[0115] The TTI may be a transmission time unit such as a channel-coded data packet (transport block), a code block, a codeword, etc., or may be a processing unit such as scheduling and link adaptation. When the TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a codeword, etc. are actually mapped may be shorter than the TTI.

[0116] Note that when one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Also, the number of slots (mini-slots) constituting the minimum time unit for the scheduling may be controlled.

[0117] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8 - 12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0118] Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, or a short TTI (e.g., a shortened TTI, etc.) may be read as a TTI having a TTI length less than that of a long TTI and not less than 1 ms.

[0119] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, it may include one or a plurality of consecutive subcarriers. The number of subcarriers included in the RB may be the same regardless of the numerology, for example, it may be 12. The number of subcarriers included in the RB may be determined based on the numerology.

[0120] Also, the time domain of the RB may include one or more symbols, and may be the length of 1 slot, 1 mini-slot, 1 sub-frame, or 1 TTI. 1 TTI, 1 sub-frame, etc. may each be composed of one or more resource blocks.

[0121] Note that one or more RBs may be referred to as physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc.

[0122] Also, the resource block may be composed of one or more resource elements (REs). For example, 1 RE may be a radio resource area of 1 sub-carrier and 1 symbol.

[0123] The bandwidth part (BWP) (which may also be called a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (common RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. The PRB is defined in a certain BWP and may be numbered within the BWP.

[0124] The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWPs may be set within one carrier for the terminal 20.

[0125] At least one of the set BWPs may be active, and the terminal 20 may not be assumed to transmit and receive a predetermined signal / channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be read as "BWP".

[0126] The structures such as the above-mentioned radio frames, sub-frames, slots, mini-slots, and symbols are merely examples. For example, the number of sub-frames included in a radio frame, the number of slots per sub-frame or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of sub-carriers included in an RB, and the number of symbols, symbol length, cyclic prefix (CP) length, etc. within a TTI can be variously changed.

[0127] In the present disclosure, for example, when articles are added by translation like a, an, and the in English, the present disclosure may include that the nouns following these articles are in the plural form.

[0128] In the present disclosure, the term "A is different from B" may mean that "A and B are different from each other". Note that this term may also mean that "A and B are each different from C". Terms such as "separate", "coupled", etc. may also be interpreted in the same way as "different".

[0129] Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched and used during execution. Also, the notification of predetermined information (for example, the notification of "being X") is not limited to being explicitly performed, and may be performed implicitly (for example, without performing the notification of the predetermined information).

[0130] As described above in detail for the present disclosure, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modified and changed aspects without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is for the purpose of illustrative explanation and has no restrictive meaning for the present disclosure.

Description of Reference Numerals

[0131] 10 Base station 110 Transmitter 120 Receiver 130 Setting unit 140 Control unit 20 Terminal 210 Transmitter 220 Receiver 230 Setting unit 240 Control unit 1001 Processor 1002 Memory device 1003 Auxiliary memory device 1004 Communication device 1005 Input device 1006 Output device 2001 Vehicle 2002 Driving unit 2003 Steering unit 2004 Accelerator pedal 2005 Brake pedal 2006 Shift lever 2007 Front wheel 2008 Rear wheel 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 support system unit 2031 Microprocessor 2032 Memory (ROM, RAM) 2033 Communication port (IO port)

Claims

1. A receiving unit that monitors paging transmitted from a base station, A control unit that does not monitor paging when transitioning to the RRC (Radio Resource Control) idle mode or the RRC inactive mode and when the type of the own device is a specific type, A transmitting unit that performs uplink transmission to the base station, The specific type is a terminal that is a device that performs only uplink transmission, a device that performs periodic uplink transmission, or a device that allows a larger downlink delay than normal.

2. The terminal according to claim 1, wherein the receiving unit receives information indicating the specific type from a network.

3. The terminal according to claim 1, wherein the control unit monitors paging for a certain period before and after the time when uplink transmission is executed.

4. The terminal according to claim 1, wherein the control unit does not monitor paging for a certain period after the time when uplink transmission is executed.

5. The terminal according to claim 1, wherein the receiving unit receives information from the base station indicating whether the uplink transmission transmitted by the transmitting unit to the base station has been normally received.

6. A receiving procedure for monitoring paging transmitted from a base station, A control procedure that does not monitor paging when transitioning to the RRC (Radio Resource Control) idle mode or the RRC inactive mode and when the type of the own device is a specific type, A terminal executes a transmission procedure for performing uplink transmission to the base station, The specific type is a communication method that is a device that performs only uplink transmission, a device that performs periodic uplink transmission, or a device that allows a larger downlink delay than normal.

Images