Terminals and communication methods

Abstract

The terminal includes: a receiving unit that receives parameters related to DRX (Discontinuous Reception) from a base station; and a control unit that controls DRX-related operations for each component carrier based on the parameters and the subcarrier spacing applied to the component carriers.

Description

Technical Field

[0001] This invention relates to terminals and communication methods in wireless communication systems. Background Technology

[0002] In NR (New Radio) (also known as 5G), the successor system to LTE (Long Term Evolution), technologies are being researched to meet requirements such as high-capacity systems, high-speed data transmission, low latency, simultaneous connection of multiple terminals, low cost, and low power consumption (e.g., Non-Patent Document 1). 5G is a mobile communication system that supports high-frequency bands such as millimeter waves exceeding 10 GHz. It can achieve ultra-high-speed wireless data communication at several Gbps levels using a bandwidth of several hundred MHz, significantly wider than existing systems such as LTE.

[0003] In LTE and NR, DRX (Discontinuous Reception) can be applied to reduce power consumption when no terminal data communication is being performed. DRX has idle DRX and connected DRX (Connected DRX).

[0004] Prior art literature

[0005] Non-patent literature

[0006] Non-patent document 1: 3GPP TS 38.300V16.0.0 (2019-12) Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In NR, carrier aggregation using CCs (Component Carriers) with different subcarrier spacings (SCS) is envisioned. On the other hand, due to parameters related to DRX that do not take subcarrier spacing into account, power consumption is sometimes difficult to control properly.

[0009] The present invention was made in view of the above circumstances, and its object is to control the power consumed when performing DRX (Discontinuous reception) in a wireless communication system.

[0010] Methods for solving problems

[0011] According to the disclosed technology, a terminal is provided, comprising: a receiving unit that receives parameters related to DRX (Discontinuous Reception) from a base station; and a control unit that controls DRX-related operations according to the parameters and the subcarrier spacing applied to the component carriers, for each component carrier.

[0012] Effects of the Invention

[0013] According to publicly available technology, in wireless communication systems, it is possible to control the power consumed when performing DRX (Discontinuous Reception). Attached Figure Description

[0014] Figure 1 This is a diagram illustrating a structural example of a wireless communication system according to an embodiment of the present invention.

[0015] Figure 2 This is a diagram showing example (1) of DRX.

[0016] Figure 3 This is a diagram showing example (2) of DRX.

[0017] Figure 4 This is a diagram illustrating an example (1) of DRX in an embodiment of the present invention.

[0018] Figure 5 This is a diagram illustrating example (2) of DRX in an embodiment of the present invention.

[0019] Figure 6 This is a diagram illustrating example (3) of DRX in an embodiment of the present invention.

[0020] Figure 7 This is a diagram illustrating an example (4) of DRX in an embodiment of the present invention.

[0021] Figure 8 This is a diagram illustrating an example of the functional structure of base station 10 in an embodiment of the present invention.

[0022] Figure 9 This is a diagram illustrating an example of the functional structure of terminal 20 in an embodiment of the present invention.

[0023] Figure 10 This is a diagram illustrating an example of the hardware structure of a base station 10 or a terminal 20 in an embodiment of the present invention. Detailed Implementation

[0024] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Furthermore, the embodiments described below are merely examples, and the application of the present invention is not limited to the following embodiments.

[0025] When the wireless communication system according to the embodiments of the present invention is in operation, existing technologies are appropriately used. However, the existing technology is, for example, existing LTE, but is not limited to existing LTE. Furthermore, unless otherwise stated, the term "LTE" as used in this specification has a broad meaning that includes LTE-Advanced and LTE-Advanced and later modes (e.g., NR).

[0026] Furthermore, 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) used in existing LTE are used. These are for ease of description, and the same signals, functions, etc., can also be referred to by other names. In addition, the above terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, NR-PDCCH, NR-PDSCH, NR-PUCCH, and NR-PUSCH. However, even signals used in NR are not necessarily labeled as "NR-".

[0027] Furthermore, in embodiments of the present invention, the duplex mode can be TDD (Time Division Duplex), FDD (Frequency Division Duplex), or other modes (e.g., Flexible Duplex).

[0028] Furthermore, in embodiments of the present invention, the "configure" wireless parameters can be pre-configured predetermined values, or wireless parameters notified from the base station 10 or the terminal 20.

[0029] Figure 1 This is a diagram illustrating an example structure of a wireless communication system according to an embodiment of the present invention. For example... Figure 1 As shown, it includes base station 10 and terminal 20. Figure 1 The diagram shows one base station 10 and one terminal 20, but this is only one example; multiple terminals may be present. The terminal 20 may also be referred to as a "user device." Furthermore, the wireless communication system in this embodiment may also be called an NR-U system.

[0030] Base station 10 is a communication device that provides one or more cells and communicates wirelessly with terminal 20. The physical resources of the wireless signal are defined in the time domain and frequency domain. The time domain can be defined by time slots or OFDM symbols, and the frequency domain can be defined by subbands, subcarriers, or resource blocks.

[0031] like Figure 1 As shown, base station 10 sends control information or data to terminal 20 via DL (Downlink) and receives control information or data from terminal 20 via UL (Uplink). Both base station 10 and terminal 20 are capable of beamforming for signal transmission and reception. Furthermore, both base station 10 and terminal 20 can apply MIMO (Multiple Input Multiple Output) based communication to DL or UL. Additionally, base station 10 and terminal 20 can also communicate via CA (Carrier Aggregation) based SCell (Secondary Cell) and PCell (Primary Cell).

[0032] Terminal 20 is a communication device with wireless communication capabilities, such as a smartphone, mobile phone, tablet computer, wearable terminal, or M2M (Machine-to-Machine) communication module. Figure 1 As shown, terminal 20 receives control information or data from base station 10 via DL and sends control information or data to base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system.

[0033] Alternatively, NR-DC (NR-Dual connectivity) can be implemented. It has a base station 10A acting as the MN (Master Node) and a base station 10B acting as the SN (Secondary Node). Base stations 10A and 10B are each connected to the core network. Terminal 20 communicates with both base stations 10A and 10B.

[0034] The cell group provided by base station 10A, which acts as MN, is called MCG (Master Cell Group), and the cell group provided by base station 10B, which acts as SN, is called SCG (Secondary Cell Group).

[0035] Figure 2 This is a diagram illustrating example (1) of DRX. For example... Figure 2 As shown, in order to reduce power consumption, DRX can be applied to terminal 20 when no data communication is occurring. For example... Figure 2 As shown, the period during which terminal 20 becomes active is set by drx-OnDurationTimer, and the period of the active period is specified by the DRX period.

[0036] In addition to the aforementioned drx-OnDurationTimer, DRX-related parameters also include drx-LongCycleStartOffset (representing the DRX cycle offset), drx-InactivityTimer (representing the period from when a service is generated until the service goes into sleep mode due to a timer), and drx-ShortCycle (representing the DRX cycle). These DRX-related parameters are set independently of the subcarrier spacing.

[0037] The aforementioned DRX-related parameters are notified from base station 10 to terminal 20. For example, the aforementioned DRX-related parameters may also be set in terminal 20 according to each cell group such as MCG or SCG via information elements CellGroupConfig, MAC-CellGroupConfig, and DRX-Config contained in RRC messages such as RRCReconfiguration or RRCResume.

[0038] Figure 3 The figure shows an example (2) of DRX. As mentioned above, since there are parameters in the parameters related to DRX that are set independently of the subcarrier spacing, for example, since the processing load is different for each CC when the terminal 20 uses CCs with different subcarrier spacings during CA, it is sometimes impossible to properly control the power consumption reduction.

[0039] For example, such as Figure 3 As shown, since the same drx-OnDurationTimer value is applied to both CC#0 and CC#1 when the SCS applied to CC#0 is 15kHz and the SCS applied to CC#1 is 30kHz, the frequency at which CC#1 monitors the PDCCH becomes higher.

[0040] Therefore, the associated parameters during DRX operation can also be replaced based on the subcarrier spacing.

[0041] Figure 4 This is a diagram illustrating an example (1) of DRX in an embodiment of the present invention. For example, the drx-OnDurationTimer value can be changed according to the subcarrier spacing.

[0042] For example, suppose Figure 4 The CC#0 shown represents a PCell or PSCell (Primary SCG Cell), and CC#1 represents a SCell. Whenever the subcarrier spacing in the SCell is twice that of the PCell or PSCell, the drx-OnDurationTimer value is halved. That is, the terminal 20 can set a shorter activation period in DRX by using CCs with larger subcarrier spacings. Alternatively, the drx-OnDurationTimer value set in the PCell or SCell can be used without modification.

[0043] Furthermore, for example, in a certain CC, whenever the subcarrier spacing of that CC is twice the predetermined subcarrier spacing, the drx-OnDurationTimer value becomes half. For example, in Figure 4 In the CC#1 shown, with a predetermined subcarrier spacing of 15kHz, since the subcarrier spacing of CC#1 is 30kHz, the drx-OnDurationTimer value is halved. That is, the larger the subcarrier spacing of CC applied by terminal 20, the shorter the activation period in DRX is set.

[0044] The predetermined subcarrier spacing can be 15kHz SCS, or it can be applied only to FR1, or it can be applied to both FR1 and FR2. Furthermore, the predetermined subcarrier spacing can be 60kHz SCS, or it can be applied only to FR2. Additionally, for example, in a 15kHz SCS CC, the set drx-OnDurationTimer value can be used without modification.

[0045] Figure 5 This is a diagram illustrating example (2) of DRX in an embodiment of the present invention. For example, the PDCCH monitoring period can be changed according to the subcarrier spacing. In addition, PDCCH monitoring can be set in units of time slots.

[0046] For example, suppose Figure 5CC#0 is shown as either PCell or PSCell, and CC#1 as SCell. Whenever the subcarrier spacing in the SCell is twice the subcarrier spacing of the PCell or PSCell, such as... Figure 5 As shown, terminal 20 can double the preset PDCCH monitoring period. That is, the larger the subcarrier spacing of the CC, the longer the PDCCH monitoring period can be set compared to the preset PDCCH monitoring period in the DRX. Alternatively, it is not advisable to set the PDCCH monitoring period of the SCell to be longer than the PDCCH monitoring period set in the PCell or SCell. Furthermore, the PDCCH monitoring period set in the PCell or SCell can also be used without modification.

[0047] Furthermore, for example, in a certain CC, whenever the subcarrier spacing of that CC is twice the predetermined subcarrier spacing, the PDCCH monitoring period can also be twice. For example, in Figure 5 In the CC#1 shown, with a predetermined subcarrier spacing of 15kHz, since the subcarrier spacing of CC#1 is 30kHz, the terminal 20 can also double the predetermined PDCCH monitoring period. That is, the terminal 20 can set the PDCCH monitoring period to be longer than the predetermined PDCCH monitoring period in the DRX by using CCs with larger subcarrier spacings. Furthermore, it is not advisable to set the PDCCH monitoring period of CCs with predetermined subcarrier spacings and CCs with different subcarrier spacings to be longer than the PDCCH monitoring period of CCs with predetermined subcarrier spacings.

[0048] The predetermined subcarrier spacing can be 15kHz SCS, or it can be applied only to FR1, or it can be applied to both FR1 and FR2. Furthermore, the predetermined subcarrier spacing can be 60kHz SCS, or it can be applied only to FR2. Additionally, for example, in a CC with 15kHz SCS, the set PDCCH monitoring period can be used without modification.

[0049] Figure 6 This is a diagram illustrating example (3) of DRX in an embodiment of the present invention. The drx-InactivityTimer value can be changed according to the subcarrier spacing. Additionally, as... Figure 6 As shown, the timer with the drx-InactivityTimer value starts immediately after the PDCCH of the service is generated. When the timer expires after the time specified by the drx-InactivityTimer value, the terminal 20 transitions to a sleep state.

[0050] For example, suppose Figure 6The CC#0 shown represents a PCell or PSCell, and CC#1 represents a SCell. Whenever the subcarrier spacing in the SCell is twice the subcarrier spacing of the PCell or PSCell, the drx-InactivityTimer value can also be halved. That is, the larger the subcarrier spacing of the CC used by terminal 20, the shorter the period from service generation to sleep time in the DRX can be set. Alternatively, the drx-InactivityTimer value set in the PCell or SCell can be used without modification.

[0051] Furthermore, for example, in a certain CC, whenever the subcarrier spacing of that CC is twice the predetermined subcarrier spacing, the drx-InactivityTimer value can also be halved. For example, due to... Figure 6 In the CC#1 shown, with a predetermined subcarrier spacing of 15kHz, the subcarrier spacing of CC#1 is 30kHz, so the drx-InactivityTimer value can also be half. That is, the larger the subcarrier spacing of CC applied by terminal 20, the shorter the period from service generation to sleep in DRX will be set.

[0052] The predetermined subcarrier spacing can be 15kHz SCS, or it can be applied only to FR1, or it can be applied to both FR1 and FR2. Furthermore, the predetermined subcarrier spacing can be 60kHz SCS, or it can be applied only to FR2. Additionally, for example, in a 15kHz SCS CC, the set drx-InactivityTimer value can be used without modification.

[0053] Figure 7 This is a diagram illustrating an example (4) of DRX in an embodiment of the present invention. Terminal 20 can adjust the timing of PDCCH monitoring during the activation period of DRX in multiple CCs to match the PDCCH monitoring during the activation period of DRX in any one of the multiple CCs. For example, the timing of PDCCH monitoring can be determined as shown in 1)-3) below.

[0054] 1) Terminal 20 can perform PDCCH monitoring during the DRX activation period in multiple CCs at the same start timing as PCell, matching the PDCCH monitoring during the DRX activation period of PCell. For example, in Figure 7 In the case of CC#0 being PCell and CC#1 being SCell, since the timing of PDCCH monitoring of CC#1 and CC#0 is matched, the number of PDCCH monitoring is half.

[0055] 2) Terminal 20 can perform PDCCH monitoring during the DRX activation period at the same start timing as the CC with the smallest subcarrier spacing among the multiple CCs, matching the PDCCH monitoring during the DRX activation period of the CC with the smallest subcarrier spacing among the multiple CCs. For example, in Figure 7 In this context, since CC#0 has a 15kHz SCS and CC#1 has a 30kHz SCS, CC#0 has the smallest subcarrier spacing. Because PDCCH monitoring is performed in CC#1 at the same timing as in CC#0, the number of PDCCH monitoring operations for CC#1 is half that of CC#1.

[0056] 3) Terminal 20 can perform PDCCH monitoring during the DRX activation period at the same start timing as the CC with the largest subcarrier spacing among the multiple CCs, matching the PDCCH monitoring during the DRX activation period of the CC with the largest subcarrier spacing among the multiple CCs.

[0057] In 1)-3) above, multiple CCs can be all CCs, all CCs of FR1, or all CCs of FR2.

[0058] Furthermore, different DRX configurations can be set for each CC. For example, different DRX configurations can be set for FR1 and FR2, or different DRX configurations can be set for each CC belonging to FR1 or FR2. All DRX settings can be set for each CC, or a subset of DRX parameters can be set for each CC, while other parameters are shared. Additionally, DRX configurations can include the aforementioned DRX-related parameters.

[0059] Furthermore, if no DRX setting is configured in a certain CC, terminal 20 may perform any of the actions shown in 1)-4) below.

[0060] 1) Apply the DRX setting of PCell or PSCell to this CC.

[0061] 2) Apply the DRX setting of the CC with the smallest subcarrier spacing to all CCs, all CCs within FR1, or all CCs within FR2.

[0062] 3) Apply the DRX setting of the CC with the largest subcarrier spacing to all CCs, all CCs within FR1, or all CCs within FR2.

[0063] 4) Apply the DRX settings set in units wider than the CC to the CC. For example, apply the DRX settings set per UE or per CG (cell group) to the CC.

[0064] Furthermore, when multiple BWPs (Bandwidth parts) with different subcarrier spacings are set in a certain CC at terminal 20, the subcarrier spacing of the CC applied to the operation described in the above embodiments can also be determined as shown in 1)-3) below.

[0065] 1) Refer to the subcarrier spacing of the currently active BWP

[0066] 2) Refer to the smallest subcarrier spacing among multiple BWPs

[0067] 3) Refer to the largest subcarrier spacing among multiple BWPs.

[0068] Additionally, in the above embodiments, DRX is envisioned as a connected DRX, but the embodiments can also be applied to other types of DRX, such as idle DRX.

[0069] According to the above embodiments, when applying DRX to communication based on multiple CCs, terminal 20 can improve power utilization efficiency by appropriately controlling the activation period, PDCCH monitoring period, or the period from service generation to sleep time according to the subcarrier spacing. Furthermore, when applying DRX to communication based on multiple CCs, terminal 20 can improve power utilization efficiency by performing PDCCH monitoring on all other CCs in a manner that matches the timing of PDCCH monitoring on any one CC, and by ensuring consistent timing of actions during the activation period.

[0070] That is, in a wireless communication system, it is possible to control the power consumed when performing DRX (Discontinuous reception).

[0071] (Functional Structure)

[0072] Next, an example of the functional structure of the base station 10 and terminal 20 performing the processes and actions described above will be explained. The base station 10 and terminal 20 include the functions implemented in the above embodiments. However, the base station 10 and terminal 20 may each have only a portion of the functions described in the embodiments.

[0073] <Base Station 10>

[0074] Figure 8 This is a diagram illustrating an example of the functional structure of base station 10 in an embodiment of the present invention. For example... Figure 8As shown, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130 and a control unit 140. Figure 8 The functional structure shown is merely an example. As long as the actions involved in the embodiments of this invention can be performed, the functional distinctions and names of the functional units can be arbitrary.

[0075] The transmitting unit 110 has the function of generating a signal to be transmitted to the terminal 20 and wirelessly transmitting the signal. Furthermore, the transmitting unit 110 transmits inter-network node messages to other network nodes. The receiving unit 120 includes the function of wirelessly receiving various signals transmitted from the terminal 20 and obtaining, for example, higher-level information from the received signals. Furthermore, the transmitting unit 110 has the function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, and reference signals to the terminal 20. Furthermore, the receiving unit 120 receives inter-network node messages from other network nodes. The transmitting unit 110 and the receiving unit 120 may also be combined as a communication unit.

[0076] The setting unit 130 stores preset setting information and various setting information sent to the terminal 20 into a storage device, and reads it from the storage device as needed. The content of the setting information is, for example, information required for DRX.

[0077] As described in the embodiment, the control unit 140 performs control related to DRX. Alternatively, the signal transmission-related functions of the control unit 140 may be included in the transmission unit 110, and the signal reception-related functions of the control unit 140 may be included in the reception unit 120.

[0078] Terminal 20

[0079] Figure 9 This is a diagram illustrating an example of the functional structure of terminal 20 in an embodiment of the present invention. For example... Figure 9 As shown, the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. Figure 9 The functional structure shown is merely an example. As long as the actions involved in the embodiments of this invention can be performed, the functional distinctions and names of the functional units can be arbitrary.

[0080] The transmitting unit 210 has the function of generating a transmission signal based on the transmission data and transmitting the transmission signal wirelessly. The receiving unit 220 wirelessly receives various signals and obtains higher-layer signals from the received physical layer signals. Furthermore, the receiving unit 220 has the function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals, etc., transmitted from the base station 10. Additionally, for example, as D2D communication, the transmitting unit 210 transmits PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel), etc., to other terminals 20, and the receiving unit 220 receives PSCCH, PSSCH, PSDCH, or PSBCH from other terminals 20. The transmitting unit 210 and the receiving unit 220 can also be combined into a communication unit.

[0081] The setting unit 230 stores various setting information received by the receiving unit 220 from the base station 10 or the terminal 20 into a storage device, and reads it from the storage device as needed. In addition, the setting unit 230 also stores pre-set setting information. The content of the setting information includes, for example, information required for DRX (Digital Replication).

[0082] As described in the embodiment, the control unit 240 performs control related to DRX. Alternatively, the signal transmission-related functions of the control unit 240 may be included in the transmission unit 210, and the signal reception-related functions of the control unit 240 may be included in the reception unit 220.

[0083] (Hardware Structure)

[0084] The block diagram used in the description of the above embodiments ( Figure 8 and Figure 9 The diagram illustrates blocks organized by function. These functional blocks (structural units) are implemented through any combination of at least one of hardware and software. Furthermore, there are no particular limitations on the implementation method of each functional block. That is, each functional block can be implemented using a single device that is physically or logically combined, or by directly or indirectly (e.g., using wired, wireless, etc.) connecting two or more physically or logically separate devices. Functional blocks can also be implemented by combining software with one or more of the aforementioned devices.

[0085] Functionally, it includes functions such as judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, receiving, sending, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning, but is not limited to these. For example, the functional block (structural part) that enables transmission is called the transmitting unit or transmitter. In short, as mentioned above, there are no particular limitations on the implementation method.

[0086] For example, in one embodiment of this disclosure, the base station 10, terminal 20, etc., can also function as a computer for processing the wireless communication method of this disclosure. Figure 10 This is a diagram illustrating an example of the hardware structure of a base station 10 and a terminal 20 according to an embodiment of the present disclosure. The base station 10 and the terminal 20 described above may also be physically 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, etc.

[0087] Additionally, in the following description, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware structure of base station 10 and terminal 20 can be configured to include one or more of the devices shown in the figures, or it can be configured to not include any of them.

[0088] The functions of the base station 10 and the terminal 20 are implemented by reading predetermined software (programs) into hardware such as the processor 1001 and the storage device 1002, so that the processor 1001 performs calculations and controls the communication of the communication device 1004 or controls at least one of reading out and writing data in the storage device 1002 and the auxiliary storage device 1003.

[0089] The processor 1001 controls the computer as a whole, for example, by enabling the operating system to function. The processor 1001 may also be a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, etc. For example, the aforementioned control unit 140, control unit 240, etc., can also be implemented using the processor 1001.

[0090] Furthermore, the processor 1001 reads programs (program code), software modules, or data from at least one of the auxiliary storage devices 1003 and communication devices 1004, and performs various processes accordingly. As a program, a program is used that causes the computer to perform at least a portion of the actions described in the above embodiments. For example, Figure 8 The control unit 140 of the base station 10 shown can also be implemented by a control program stored in the storage device 1002 and operating in the processor 1001. Furthermore, for example, Figure 9 The control unit 240 of the terminal 20 shown can also be implemented by a control program stored in the storage device 1002 and operating in the processor 1001. Regarding the various processes described above, although it has been stated that the various processes are executed by one processor 1001, the various processes can also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 can also be installed using more than one chip. Furthermore, the program can also be transmitted from a network via a telecommunications line.

[0091] Storage device 1002 is a computer-readable recording medium, and may be composed of at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. Storage device 1002 may also be referred to as a register, cache, main memory (main storage device), etc. Storage device 1002 can store programs (program code), software modules, etc., that are executable for implementing the communication method according to one embodiment of this disclosure.

[0092] The auxiliary storage device 1003 is a computer-readable recording medium, such as at least one of the following: CD-ROM (CompactDisc ROM) or other optical discs, hard disks, floppy disks, magneto-optical discs (e.g., compact discs, digital multipurpose discs, Blu-ray discs, smart cards, flash memory (e.g., cards, sticks, key drives), floppy disks, magnetic stripes, etc. The aforementioned recording medium may, for example, be a database, server, or other suitable media that includes at least one of the storage device 1002 and the auxiliary storage device 1003.

[0093] Communication device 1004 is hardware (transceiver) used for communication between computers via at least one of a wired network and a wireless network. It is also referred to as a network device, network controller, network interface card (NIC), communication module, etc. Communication device 1004 may, for example, be configured to include high-frequency switches, duplexers, filters, frequency synthesizers, etc., to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, transceiver antennas, amplifiers, transceiver units, transmission path interfaces, etc., can also be implemented using communication device 1004. The transceiver unit may also be physically or logically separated into a transmitting unit and a receiving unit.

[0094] Input device 1005 is an input device that accepts input from external sources (e.g., keyboard, mouse, microphone, switch, button, sensor, etc.). Output device 1006 is an output device that performs output to external sources (e.g., display, speaker, LED, etc.). Alternatively, input device 1005 and output device 1006 can also be integrated (e.g., a touch panel).

[0095] Furthermore, the processor 1001 and storage device 1002, among other devices, are connected via a bus 1007 for communicating information. The bus 1007 can be a single bus or can be composed of different buses between devices.

[0096] Furthermore, the base station 10 and the terminal 20 can be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or a FPGA (Field Programmable Gate Array), and can also use this hardware to implement part or all of the functional blocks. For example, the processor 1001 can also be implemented using at least one of these hardware components.

[0097] (Summary of Implementation Methods)

[0098] As described above, according to an embodiment of the present invention, a terminal is provided, comprising: a receiving unit that receives parameters related to DRX (Discontinuous Reception) from a base station; and a control unit that controls DRX-related operations according to the parameters and the subcarrier spacing applied to the component carriers for each component carrier.

[0099] Based on the above structure, when applying DRX to communication based on multiple CCs, terminal 20 can improve power utilization efficiency by appropriately controlling the activation period, PDCCH monitoring period, or the period from service generation to sleep time according to the subcarrier spacing. That is, in the wireless communication system, it is possible to control the power consumed when performing DRX (Discontinuous Reception).

[0100] The parameter can also represent the activation period; the larger the subcarrier spacing of a component carrier, the shorter the activation period of the DRX is set by the control unit. According to this structure, when applying DRX to communication based on multiple carriers, the terminal 20 can improve power utilization efficiency by appropriately controlling the activation period according to the subcarrier spacing.

[0101] The parameter can also indicate that during the activation period, the larger the subcarrier spacing of the component carriers, the longer the monitoring period of the control unit is set compared to the monitoring period of the control signal preset during the DRX activation period. According to this structure, when applying DRX to communication based on multiple carriers, the terminal 20 can improve power utilization efficiency by appropriately controlling the PDCCH monitoring period according to the subcarrier spacing.

[0102] The parameter can also represent the timing of the control unit's monitoring of the control signal during the activation period of the DRX in the component carrier with the smallest subcarrier spacing among the multiple component carriers, and the monitoring of the control signal during the activation period of the DRX in each of the multiple component carriers. According to this structure, when the terminal 20 applies DRX to communication based on multiple CCs, it can improve the efficiency of power utilization by appropriately controlling the PDCCH monitoring period according to the subcarrier spacing.

[0103] The parameter can also represent the period from service generation to sleep. The larger the subcarrier spacing of the component carrier, the shorter the period from service generation to sleep is set by the control unit. According to this structure, when applying DRX to communication based on multiple CCs, the terminal 20 can improve power utilization efficiency by appropriately controlling the period from service generation to sleep according to the subcarrier spacing.

[0104] Furthermore, according to an embodiment of the present invention, a communication method is provided, wherein a terminal performs the following steps: a receiving step, receiving parameters related to DRX (Discontinuous Reception) from a base station; and a control step, controlling DRX-related actions according to the parameters and the subcarrier spacing applied to the component carriers, for each component carrier.

[0105] Based on the above structure, when applying DRX to communication based on multiple CCs, terminal 20 can improve power utilization efficiency by appropriately controlling the activation period, PDCCH monitoring period, or the period from service generation to sleep time according to the subcarrier spacing. That is, in the wireless communication system, it is possible to control the power consumed when performing DRX (Discontinuous Reception).

[0106] (Supplement to the implementation method)

[0107] The embodiments of the present invention have been described above, but the disclosed invention is not limited to these embodiments. Those skilled in the art should understand various modifications, alterations, substitutions, and replacements. Specific numerical examples have been used to facilitate understanding of the invention, but unless otherwise specified, these values ​​are merely examples, and any appropriate values ​​may be used. The distinctions between items in the above description are not essential to the present invention; items described in two or more items may be combined as needed, and items described in one item may be applied to items 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. Multiple functional units may be operated by a single physical component, or a single functional unit may be operated by multiple physical components. Regarding the processing procedures described in the embodiments, the order of processing may be interchanged unless there is a contradiction. For ease of explanation, the base station 10 and terminal 20 have been described using functional block diagrams, but this device may also be implemented in hardware, software, or a combination thereof. The software operating via the processor of the base station 10 according to an embodiment of the present invention and the software operating via the processor of the terminal 20 according to an embodiment of the present invention can also be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server and other suitable storage media, respectively.

[0108] Furthermore, the notification of information is not limited to the forms / implementations described in this disclosure, and other methods may also be used. For example, the notification of information may be implemented through physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or combinations thereof. Additionally, RRC signaling may also be referred to as an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0109] The various forms / implementations described in this disclosure can also be applied to at least one of LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (new Radio), 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-Wide Band), Bluetooth (registered trademark), systems using other suitable systems, and next-generation systems extended therefrom. Furthermore, multiple systems can be combined (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.) for application.

[0110] The processing procedures, timing, and flow of the various forms / implementations described in this specification may be rearranged in order, provided there is no contradiction. For example, the elements of various steps are indicated using an illustrative order for the methods described in this disclosure, but are not limited to the specific order indicated.

[0111] In this specification, certain actions purported to be performed by base station 10 may sometimes be performed through its upper node, depending on the circumstances. In a network consisting of one or more network nodes including base station 10, it is obvious that various actions performed to communicate with terminal 20 can be performed by at least one of base station 10 and other network nodes besides base station 10 (e.g., considering MME or S-GW, but not limited to these). The above example illustrates the case where there is only one other network node besides base station 10, but other network nodes can also be a combination of multiple other network nodes (e.g., MME and S-GW).

[0112] The information or signals described in this disclosure can be output from a higher (or lower) layer to a lower (or higher) layer. They can also be input or output via multiple network nodes.

[0113] Input or output information can be stored in a specific location (e.g., memory) or managed using a management table. Input or output information can be overwritten, updated, or appended. Output information can also be deleted. Input information can also be sent to other devices.

[0114] The determination in this disclosure can be made by a value represented by 1 bit (0 or 1), by a Boolean value (Boolean: true or false), or by a comparison of numerical values ​​(e.g., a comparison with a predetermined value).

[0115] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, should be broadly interpreted as commands, command sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0116] Furthermore, software, commands, and information can be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technologies (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0117] The information, signals, etc., described in this disclosure can also be represented using any of a variety of different technologies. For example, the data, commands, instructions, information, signals, bits, symbols, chips, etc., that may be involved in the above description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination of these.

[0118] Furthermore, the terms used in this disclosure and those necessary for understanding this disclosure may be replaced with terms that have the same or similar meanings. For example, at least one of the channel and symbol may also be a signal (signaling). Additionally, a signal may also be a message. Furthermore, a component carrier (CC) may also be referred to as a carrier frequency, cell, frequency carrier, etc.

[0119] The terms “system” and “network” as used in this disclosure are used interchangeably.

[0120] Furthermore, the information, parameters, etc., described in this disclosure may be represented using absolute values, relative values ​​to predetermined values, or other corresponding information. For example, wireless resources may also be indicated by indexes.

[0121] The names used for the above parameters are not limiting in any way. Furthermore, the formulas, etc., using these parameters sometimes differ from those explicitly disclosed in this disclosure. Since a wide variety of channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by all appropriate names, the various names assigned to these wide variety of channels and information elements are not limiting in any way.

[0122] In this disclosure, the terms "base station (BS)," "wireless base station," "base station device," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" are used interchangeably. Sometimes, terms such as macro cell, small cell, femtocell, and picocell are also used to refer to base stations.

[0123] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, its coverage area can be divided into several smaller areas, each of which can also provide communication services through a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). Terms such as "cell" or "sector" refer to a portion or all of the coverage area of ​​at least one of the base station and base station subsystem providing communication services within that coverage area.

[0124] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" are used interchangeably.

[0125] For mobile stations, those skilled in the art sometimes also use the following terms: 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, handheld device, user agent, mobile client, client, or some other appropriate terms.

[0126] At least one of the base station and mobile station can also be referred to as a transmitting device, receiving device, communication device, etc. Furthermore, at least one of the base station and mobile station can be a device mounted on a mobile body, the mobile body itself, etc. The mobile body can be a vehicle (e.g., a car, an airplane, etc.), a mobile body moving in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanized or unmanned). Additionally, at least one of the base station and mobile station also includes devices that do not necessarily move during communication. For example, at least one of the base station and mobile station can be an IoT (Internet of Things) device such as a sensor.

[0127] Furthermore, the base station in this disclosure can also be replaced by a user terminal. For example, various forms / implementations of this disclosure can be applied to a structure that replaces the communication between the base station and the user terminal with communication between multiple terminals 20 (e.g., also referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). In this case, the terminal 20 can also be configured to have the functions of the base station 10 described above. In addition, terms such as "uplink" and "downlink" can be replaced with terms corresponding to inter-terminal communication (e.g., "side"). For example, uplink channel, downlink channel, etc., can also be replaced with side channel.

[0128] Similarly, the user terminal in this disclosure can be replaced by a base station. In this case, the base station can also be configured to have the functions of the user terminal described above.

[0129] The terms "determining" and "determining" as used in this disclosure sometimes encompass a variety of actions. For example, "determining" and "determining" can include actions such as judging, calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, database, or other data structure), and ascertaining, which are considered as actions of "determining" and "determining." Furthermore, "determining" and "determining" can include actions such as receiving (e.g., receiving information), transmitting (e.g., sending information), inputting, outputting, and accessing (e.g., accessing data in memory), which are considered as actions of "determining" and "determining." Additionally, "determining" and "determining" can include actions such as resolving, selecting, choosing, establishing, and comparing, which are considered as actions of "determining" and "determining." That is, "judgment" and "decision" can include matters that are considered as having been "judged" or "decided". In addition, "judgment (decision)" can also be replaced by "assuming", "expecting", "considering", etc.

[0130] The terms “connected,” “coupled,” or any variations thereof are intended to indicate any direct or indirect connection or combination between two or more elements, including cases where there is one or more intermediate elements between the two elements that are “connected” or “coupled.” The combination or connection between elements can be physical, logical, or a combination of these. For example, “access” can be used instead of “connected.” In the context of this disclosure, it can be understood that two elements are “connected” or “coupled” to each other using at least one of one or more wires, cables, and printed electrical connections, and, as some non-limiting and non-inclusive examples, using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, and light (both visible and invisible) region to “connect” or “couple” to each other.

[0131] The reference signal can be simply referred to as RS (Reference Signal), or, depending on the standard applied, as a pilot.

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

[0133] Any reference to an element using the designations “first,” “second,” etc., as used in this disclosure does not necessarily limit the number or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, references to “first element” and “second element” do not imply that only two elements can be taken, or that in any form the first element must precede the second element.

[0134] Alternatively, the "unit" in the structure of the above devices can be replaced with "section", "circuit", "equipment", etc.

[0135] When the terms "include," "including," and their variations are used in this disclosure, these terms, like the term "comprising," imply inclusion. Furthermore, the term "or" as used in this disclosure does not refer to XOR.

[0136] A radio frame can consist of one or more frames in the time domain. Each frame in the time domain can be called a subframe. A subframe can further consist of one or more time slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) independent of the parameter set (numerology).

[0137] A parameter set can be communication parameters applied to at least one side of the transmission and reception of a signal or channel. For example, a parameter set can represent at least one of the following: Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering processing performed by the transceiver in the frequency domain, and specific windowing processing performed by the transceiver in the time domain.

[0138] In the time domain, a time slot can be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.). A time slot can be a time unit based on a set of parameters.

[0139] A time slot can contain multiple mini-time slots. Each mini-time slot can consist of one or more symbols in the time domain. Furthermore, a mini-time slot can also be called a sub-time slot. A mini-time slot can consist of fewer symbols than a time slot. PDSCH (or PUSCH) transmitted in time units larger than mini-time slots can be called PDSCH (or PUSCH) mapping type (type) A. PDSCH (or PUSCH) transmitted using mini-time slots can be called PDSCH (or PUSCH) mapping type (type) B.

[0140] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols can each be referred to by other corresponding names.

[0141] For example, a subframe can also be called a Transmission Time Interval (TTI), multiple consecutive subframes can also be called a TTI, and a time slot or a mini-time slot can also be called a TTI. That is, at least one of a subframe and a TTI can be a subframe in the existing LTE (1ms), a period shorter than 1ms (e.g., symbols 1-13), or a period longer than 1ms. In addition, the unit representing TTI may not be called a subframe, but a time slot, mini-time slot, etc.

[0142] Here, TTI refers, for example, to the smallest unit of time for scheduling in wireless communication. For instance, in an LTE system, the base station schedules the allocation of radio resources (bandwidth, transmit power, etc., available to each terminal 20) on a TTI basis. However, the definition of TTI is not limited to this.

[0143] The Time Interval (TTI) can be the transmission time unit for channel-coded data packets (transmission blocks), code blocks, codewords, etc., or it can be a processing unit for scheduling, link adaptation, etc. Furthermore, when a TTI is given, the actual time interval (e.g., the number of symbols) in which the transmission block, code block, codeword, etc., are mapped can be shorter than that TTI.

[0144] Furthermore, when one time slot or one mini-time slot is referred to as a TTI, more than one TTI (i.e., more than one time slot or more than one mini-time slot) can constitute the minimum time unit for scheduling. Moreover, the number of time slots constituting this minimum time unit for scheduling (the number of mini-time slots) can be controlled.

[0145] A TTI with a duration of 1ms is also known as a normal TTI (in LTE Rel.8-12), a long TTI, a normal subframe, a normal subframe, a long subframe, or a time slot. A TTI shorter than a normal TTI can be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini time slot, a sub-time slot, or a time slot.

[0146] Additionally, for long TTIs (e.g., regular TTIs, subframes, etc.), they can be replaced with TTIs with a duration of more than 1ms. For short TTIs (e.g., shortened TTIs, etc.), they can be replaced with TTIs with a duration of less than long TTIs and a duration of more than 1ms.

[0147] A resource block (RB) is a unit of resource allocation in both the time and frequency domains. In the frequency domain, it can contain one or more consecutive subcarriers. The number of subcarriers contained in an RB can be the same regardless of the parameter set; for example, it can be 12. The number of subcarriers contained in an RB can also be determined based on the parameter set.

[0148] Furthermore, the temporal domain of an RB can contain one or more symbols, and can be 1 time slot, 1 mini-time slot, 1 subframe, or 1 TTI in length. 1 TTI, 1 subframe, etc., can each be composed of one or more resource blocks.

[0149] In addition, one or more RBs can be called Physical Resource Block (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB Pair, RB Pair, etc.

[0150] Furthermore, a resource block can consist of one or more resource elements (REs). For example, 1 RE can be a radio resource area consisting of 1 subcarrier and 1 symbol.

[0151] The Bandwidth Part (BWP) (which may also be referred to as partial bandwidth, etc.) can represent a subset of contiguous common resource blocks (RBs) used for a certain parameter set in a given carrier. Here, common resource blocks can be determined by indexing RBs based on a common reference point of that carrier. PRBs can be defined and numbered within a BWP.

[0152] A BWP can include a UL BWP and a DL BWP. One or more BWPs can be set for a UE within one carrier.

[0153] At least one of the configured BWPs can be active, and it is not assumed that the UE will transmit or receive predetermined signals / channels outside of an active BWP. Furthermore, the terms "cell," "carrier," etc., used in this disclosure can be replaced with "BWP."

[0154] The structures of radio frames, subframes, time slots, mini-time slots, and symbols described above are merely illustrative. For example, the number of subframes contained in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots contained in a time slot, the number of symbols and RBs contained in a time slot or mini-time slot, the number of subcarriers contained in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc., can be varied in many ways.

[0155] In this disclosure, for example, in cases where articles are added through translation, such as in English (e.g., a, an, and the), this disclosure may also include cases where the noun following these articles is in a plural form.

[0156] In this disclosure, the phrase "A and B are different" can also mean "A and B are not the same." Furthermore, this phrase can also mean "A and B are each different from C." Terms such as "separate" and "combined" can also be interpreted in the same way as "different."

[0157] The various forms / implementations described in this disclosure can be used individually or in combination, and can be switched depending on the execution. Furthermore, the notification of predetermined information is not limited to explicit notification (e.g., a "Yes X" notification) but can also be implicit notification (e.g., not notifying the predetermined information).

[0158] In addition, in this disclosure, PDCCH is an example of a control signal.

[0159] The present disclosure has been described in detail above, but it will be 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 as modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the present disclosure is for illustrative purposes only and is not intended to be limiting.

[0160] Label Explanation

[0161] 10: Base station;

[0162] 110: Dispatch Department;

[0163] 120: Receiving Unit;

[0164] 130: Setting Department;

[0165] 140: Control Department;

[0166] 20: Terminal;

[0167] 210: Sending Department;

[0168] 220: Receiving unit;

[0169] 230: Setting Department;

[0170] 240: Control Unit;

[0171] 1001: Processor;

[0172] 1002: Storage device;

[0173] 1003: Auxiliary storage device;

[0174] 1004: Communication device;

[0175] 1005: Input device;

[0176] 1006: Output device.

Claims

1. A terminal having: The receiving unit receives parameters related to discontinuous reception (DRX) from the base station; and The control unit, based on the aforementioned parameters and the subcarrier spacing applied to the component carriers, controls the DRX-related actions for each component carrier. The parameters include the period from when the service is initiated until it goes into hibernation. The larger the subcarrier spacing of the component carriers, the shorter the period from service generation to sleep time set by the control unit.

2. The terminal according to claim 1, wherein, The parameters also include the activation period. The larger the subcarrier spacing of the component carriers, the shorter the activation period of DRX is set by the control unit.

3. The terminal according to claim 1, wherein, The parameters also include the activation period. The larger the subcarrier spacing of the component carriers, the longer the monitoring period is set by the control unit compared to the monitoring period of the control signal preset during the DRX activation period.

4. The terminal according to claim 1, wherein, The parameters also include the activation period. The control unit monitors the control signals during the activation period of the DRX in each of the multiple component carriers at the timing of the monitoring of the control signals during the activation period of the DRX in the component carrier with the minimum subcarrier spacing.

5. A communication method, wherein, The terminal will execute the following steps: The receiving step involves receiving parameters related to discontinuous reception, i.e., DRX, from the base station. as well as The control steps involve controlling DRX-related actions for each component carrier based on the parameters and the subcarrier spacing applied to the component carriers. The parameters include the period from when the service is initiated until it goes into hibernation. The larger the subcarrier spacing of the component carriers, the shorter the period from service generation to sleep time should be set in the control steps.

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