Terminal and communication method

Abstract

The terminal includes: a receiving unit that receives a signal in a physical layer including information related to monitoring of a control channel from a base station; and a control unit that monitors the control channel sent from the base station, and the control unit sets a period during which the control channel is not monitored based on the information.

Description

Technical Field

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

[0002] In NR (New Radio), also known as "5G," the successor system to LTE (Long Term Evolution), research is underway to develop technologies that meet the requirements of large-capacity systems, high data transmission speeds, low latency, simultaneous connection of multiple terminals, low costs, and power savings (for example, 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 communications at the multi-Gbps level by utilizing a bandwidth of several hundred MHz, which is significantly wider than existing systems such as LTE.

[0003] In LTE and NR, when a terminal is not performing data communication, DRX (Discontinuous Reception) can be applied to reduce power consumption. DRX includes DRX during idle time and CDRX (Connected DRX) during connected time.

[0004] Prior art literature

[0005] Non-patent literature

[0006] Non-Patent Document 1: 3GPP TS 38.300 V16.0.0 (December 2019) Summary of the Invention

[0007] Problems to be solved by the invention

[0008] In NR, since the control based on the existing CDRX is semi-static control in the MAC (Medium Access Control) layer, it is difficult to dynamically reduce the timing of monitoring the PDCCH.

[0009] The present invention has been made in view of the above-described circumstances, and an object of the present invention is to reduce the power consumed in monitoring a control signal in a wireless communication system.

[0010] Means used to solve problems

[0011] According to the disclosed technology, a terminal is provided, which includes: a receiving unit that receives a signal in a physical layer containing information related to monitoring of a control channel from a base station; and a control unit that monitors the control channel sent from the base station, and the control unit sets a period during which the control channel is not monitored based on the information.

[0012] Effects of the Invention

[0013] According to the disclosed technology, it is possible to reduce the power consumed in monitoring control signals in a wireless communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a diagram showing a configuration example of a wireless communication system in an embodiment of the present invention.

[0015] Figure 2 is a diagram illustrating an example of DRX.

[0016] Figure 3 This is a diagram showing an example (1) of PDCCH monitoring in an embodiment of the present invention.

[0017] Figure 4 This is a timing chart for explaining PDCCH monitoring in the embodiment of the present invention.

[0018] Figure 5 This is a flowchart for explaining Example (1) of processing related to DCI in the embodiment of the present invention.

[0019] Figure 6 This is a flowchart for explaining Example (2) of the process related to DCI in the embodiment of the present invention.

[0020] Figure 7 This is a diagram showing Example (2) of PDCCH monitoring in the embodiment of the present invention.

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

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

[0023] Figure 10 This is a diagram showing an example of the hardware configuration of the base station 10 or the terminal 20 in the embodiment of the present invention. DETAILED DESCRIPTION

[0024] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is merely an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0025] The wireless communication system according to the embodiments of the present invention may appropriately utilize existing technologies when operating. However, such existing technologies may be, for example, existing LTE, but are not limited to existing LTE. Furthermore, unless otherwise specified, the term "LTE" used in this specification has a broad meaning encompassing LTE-Advanced and later generations (e.g., NR).

[0026] 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) used in existing LTE are used. This is for the sake of convenience, and the same signals, functions, etc. may 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, NR-PUSCH, etc. However, even signals used in NR are not necessarily explicitly indicated as "NR-".

[0027] Furthermore, in the embodiment of the present invention, the duplexing method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or another method (eg, Flexible Duplex, etc.).

[0028] Furthermore, in the embodiment of the present invention, “configuring” wireless parameters and the like may be pre-configuring predetermined values, or may be configuring wireless parameters notified from the base station 10 or the terminal 20 .

[0029] Figure 1 FIG is a diagram showing a configuration example of a wireless communication system in an embodiment of the present invention. Figure 1 As shown, it includes a base station 10 and a terminal 20. Figure 1 1 and 1 terminal 20 are shown, respectively. However, this is merely an example, and multiple base stations 10 and 20 may be provided. Terminal 20 may also be referred to as a "user device." Furthermore, the wireless communication system in this embodiment may also be referred to as an NR-U system.

[0030] Base station 10 is a communication device that provides one or more cells and conducts wireless communications with terminal 20. Physical resources of wireless signals are defined in the time domain and the 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, the base station 10 sends control information or data to the terminal 20 via DL (Downlink), and receives control information or data from the terminal 20 via UL (Uplink). Both the base station 10 and the terminal 20 can perform beamforming to transmit and receive signals. In addition, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output)-based communications to DL or UL. In addition, both the base station 10 and the terminal 20 can communicate via SCell (Secondary Cell) and PCell (Primary Cell) based on CA (Carrier Aggregation).

[0032] The terminal 20 is a communication device having a wireless communication function, such as a smart phone, a mobile phone, a tablet computer, a wearable terminal, or an M2M (Machine-to-Machine) communication module. Figure 1 As shown, the terminal 20 receives a control signal or data from the base station 10 via DL and transmits a control signal or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system.

[0033] NR-Dual Connectivity (NR-DC) can also be implemented. For example, base station 10A functions as a Master Node (MN) and base station 10B functions as a Secondary Node (SN). Base stations 10A and 10B are each connected to a core network. Terminal 20 communicates with both base stations 10A and 10B.

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

[0035] Figure 2 : is a diagram showing an example of DRX. Figure 2 As shown, when no data communication occurs, DRX can be applied to the terminal 20 in order to reduce power consumption. Figure 2 As shown, the period during which the terminal 20 is active is set by drx-OnDurationTimer, and the period of the active period is specified by the DRX cycle.

[0036] In addition to the aforementioned drx-OnDurationTimer, DRX-related parameters include drx-LongCycleStartOffset, which indicates the offset of the DRX cycle; drx-InactivityTimer, which indicates the duration from when a timer starts when traffic occurs until it goes dormant; and drx-ShortCycle, which indicates the DRX cycle. These DRX-related parameters are set regardless of the subcarrier spacing.

[0037] The above-mentioned DRX-related parameters are notified from the base station 10 to the terminal 20. For example, the above-mentioned DRX-related parameters can be set for the terminal 20 according to each cell group such as MCG or SCG via the information elements CellGroupConfing, MAC-CellGroupConfing, and DRX-Config included in the RRC message, such as RRCReconfiguration or RRCResume.

[0038] In particular, in a terminal 20 in NR connected mode, the impact of PDCCH monitoring, which does not include scheduling information for the terminal itself, on power consumption is significant. Therefore, research is underway to reduce power consumption caused by this PDCCH monitoring.

[0039] In the existing technology of NR, such as Figure 2 As shown, it is possible to apply techniques such as CDRX to limit the timing of performing PDCCH monitoring and reduce power consumption.

[0040] However, since the existing CDRX control is a semi-static control in the MAC (Medium Access Control) layer, it is not possible to dynamically reduce PDCCH monitoring. In addition, the transition to the CDRX state can be performed based on a timer or a notification based on a control signal in the MAC layer.

[0041] In NR, due to the shorter slot lengths supported by the subcarrier spacing, the number of PDCCH monitoring times per unit time tends to increase. Therefore, it is difficult to sufficiently reduce PDCCH monitoring in CDRX control. In particular, in FR2, where the subcarrier spacing is larger, the tendency for PDCCH monitoring times to increase, as described above, is even more pronounced.

[0042] By doing so, it is possible to notify the terminal 20 of or set a period during which PDCCH monitoring can be skipped using DCI (Downlink control information).

[0043] Figure 3 : is a diagram showing an example (1) of PDCCH monitoring in an embodiment of the present invention. Figure 3 As shown, the skip period is notified by the DCI received via the PDCCH. The terminal 20 does not perform PDCCH monitoring during the skip period. The above-mentioned skipping of PDCCH monitoring can be performed during DRX or non-DRX. Figure 3 As shown, normal PDCCH monitoring may be set for each time slot, or the base station 10 may notify the terminal 20 of a period for skipping PDCCH monitoring in time slot units, so that the terminal 20 skips PDCCH monitoring in time slot units.

[0044] Figure 4 This is a timing diagram for illustrating PDCCH monitoring in an embodiment of the present invention. In step S11, the base station 10 sends high-layer parameters to the terminal 20. The high-layer parameters may be, for example, parameters of the RRC layer. In step S12, the base station 10 sends a DCI to the terminal 20 containing information indicating a period during which PDCCH monitoring can be skipped. Next, the terminal 20 sets a setting not to monitor the PDCCH during the notified period during which PDCCH monitoring can be skipped (S13). In addition, step S11 may be performed or omitted as needed.

[0045] For example, terminal 20 can use DCI to select a value from multiple values ​​pre-set by higher-layer parameters, thereby obtaining information indicating the period during which PDCCH monitoring can be skipped. For example, higher-layer parameters can be used to set time slots 1 and 4, with a DCI field bit value of 0 notifying time slot 1 and a DCI field bit value of 1 notifying time slot 4. Furthermore, as another example, higher-layer parameters can be used to set time slots 0 and 2, with a DCI field bit value of 0 notifying time slot 0 and a DCI field bit value of 1 notifying time slot 2.

[0046] Furthermore, for example, DCI may be used to notify the terminal 20 of periods in which PDCCH monitoring can be skipped, as predefined in the specification. For example, the periods in which PDCCH monitoring can be skipped, as predefined in the specification, may be specified in units of 1 slot, such as 0 slots, 1 slot, 2 slots, 3 slots, etc., or in units of 0 slots and slots that are powers of 2, such as 0 slots, 1 slot, 2 slots, 4 slots, etc., or in units of slots that are multiples of 2, such as 0 slots, 2 slots, 4 slots, 6 slots, etc. Furthermore, some of the above-specified number of slots may not be specified, for example, 0 slot may not be specified.

[0047] In addition, the terminal 20 can skip DCI according to the type of RNTI (Radio network temporary identifier). Skipping DCI can be skipping the PDCCH monitoring corresponding only to the RNTI to be skipped, or it can be skipping the decoding of the PDCCH corresponding to the RNTI to be skipped when performing PDCCH monitoring corresponding to both the RNTI to be skipped and the RNTI not to be skipped. For example, when notified of the period during which DCI can be skipped, the terminal 20 can skip only the DCI corresponding to the C-RNTI (Cell-RNTI) during the corresponding period, or it can skip the DCI corresponding to all RNTIs. In addition, the type of RNTI for skipping the corresponding DCI can be pre-specified by the specification, or it can be notified to the terminal 20.

[0048] Furthermore, as an exception, the types of RNTIs that are not skipped can be specified in a specification, or the base station 10 can notify the terminal 20. For example, when notified of a period during which DCI can be skipped, the terminal 20 can be specified or notified to "not skip DCI corresponding to the RA-RNTI (which may also be a random access-RNTI or other type of RNTI) during that period." In other words, the terminal 20 can be specified or notified to monitor the PDCCH corresponding to the RA-RNTI.

[0049] Furthermore, the terminal 20 can reinterpret the field “Minimum applicable scheduling offset indicator” included in the DCI according to conditions, thereby notifying the terminal 20 from the base station 10 of a period in which the PDCCH can be skipped.

[0050] Furthermore, the "Minimum applicable scheduling offset indicator" is information used in cross-slot scheduling and specifies the minimum allowable offset between the scheduled DCI and the scheduled PDSCH. For example, the minimum offset can be set in units of slots.

[0051] When the higher-layer parameter (e.g., RRC layer parameter) "minimumSchedulingOffset" is set, the 1-bit field "Minimum applicable scheduling offset indicator" included in the DCI determines whether to apply the predetermined minimum offset to DL-BWP (Bandwidth Part) and UL-BWP respectively.

[0052] Figure 5 This is a flowchart for explaining Example (1) of DCI-related processing in an embodiment of the present invention. In step S21, the terminal 20 determines whether a specific higher-layer parameter is set. The specific higher-layer parameter may be, for example, the RRC layer parameter "minimumSchedulingOffset", which can be set by the base station 10 for the terminal 20. If at least one specific higher-layer parameter is set ("Yes" in S21), the process proceeds to step S22. If no specific higher-layer parameter is set ("No" in S21), the process proceeds to step S23.

[0053] In step S22, terminal 20 identifies the specific field of the DCI as normal scheduling. The specific field of the DCI may be a "Minimum applicable scheduling offset indicator." Meanwhile, in step S23, terminal 20 identifies the specific field of the DCI as a period during which PDCCH monitoring can be skipped. That is, in step S23, terminal 20 may notify the period during which PDCCH monitoring can be skipped using the "Minimum applicable scheduling offset indicator."

[0054] Furthermore, for example, the terminal 20 can use the parameters shown in 1) to 3) below to identify the corresponding value from the 1-bit value of "Minimum applicable scheduling offset indicator" included in the DCI and notify the period in which PDCCH monitoring can be skipped.

[0055] 1) The parameters for notifying the period during which PDCCH monitoring can be skipped may be notified from the base station 10 to the terminal 20 via the RRC layer or the MAC layer. For example, one or two parameters may be notified to the terminal 20 via the RRC layer or the MAC layer, and the terminal 20 may use the corresponding parameters as the period that can be skipped, depending on the value of 0 or 1 of the "Minimum applicable scheduling offset indicator" included in the DCI.

[0056] 2) Depending on the value of 0 or 1 of the "Minimum applicable scheduling offset indicator" included in the DCI, the specification may predefine a period during which corresponding PDCCH monitoring can be skipped.

[0057] 3) The terminal 20 may use the period of existing parameters as the period that can be skipped. For example, the terminal 20 may use the corresponding value of the DRX-related parameters, such as 0 or 1, as the period that can skip the PDCCH, based on the value of the "Minimum applicable scheduling offset indicator" included in the DCI.

[0058] Furthermore, the terminal 20 can reinterpret the value in the DCI according to the conditions, thereby being notified of the period during which PDCCH monitoring can be skipped.

[0059] Figure 6 This is a flowchart for illustrating Example (2) of processing related to DCI in an embodiment of the present invention. In step S31, terminal 20 determines whether DCI includes scheduling information. If the DCI includes scheduling information ("Yes" in S31), the process proceeds to step S32. If the DCI does not include scheduling information ("No" in S31), the process proceeds to step S33.

[0060] In step S32, the terminal 20 may identify the DCI as normal scheduling. Meanwhile, in step S33, the terminal 20 may identify a specific field in the DCI as a period during which PDCCH monitoring can be skipped. For example, in step S33, the terminal 20 may be notified of the period during which PDCCH monitoring can be skipped using a "Minimum applicable scheduling offset indicator." Furthermore, for example, the terminal 20 may reinterpret the value of K0, which can be read from information included in the DCI, to notify the period during which PDCCH monitoring can be skipped.

[0061] Furthermore, in step S31, when the terminal 20 determines whether the DCI includes scheduling information or does not include scheduling information, the determination can be made using any set value among the values ​​constituting the DCI. For example, if the set value of the scheduling frequency allocation is a specific value, the DCI can be determined to be DCI that does not include scheduling information. The specific value can be a special value that is not normally used.

[0062] Furthermore, in step S33 , the terminal 20 can recognize that the period during which PDCCH monitoring can be skipped is notified by the “Minimum applicable scheduling offset indicator” included in the DCI not including the scheduling information.

[0063] Furthermore, for example, the terminal 20 can use the parameters shown in 1) to 4) below to identify, from the value of 1 bit of "Minimum applicable scheduling offset indicator" included in the DCI, a period in which the corresponding value notifies that PDCCH monitoring can be skipped.

[0064] 1) The parameters for notifying the period during which PDCCH monitoring can be skipped can be notified from the base station 10 to the terminal 20 via the RRC layer or the MAC layer. For example, one or two parameters can be notified to the terminal 20 via the RRC layer or the MAC layer, and the terminal 20 uses the corresponding parameters as the skippable period based on the value 0 or 1 of the "Minimum applicable scheduling offset indicator" included in the DCI.

[0065] 2) The value set by the "minimumSchedulingOffset" parameter for cross-slot scheduling can be used. Similar to cross-slot scheduling, one or two parameters can be set. Furthermore, depending on the value of 0 or 1 in the "Minimum applicable scheduling offset indicator" included in the DCI, the terminal 20 uses the corresponding parameter value as the period during which PDCCH monitoring can be skipped.

[0066] 3) Based on the value 0 or 1 of the "Minimum applicable scheduling offset indicator" included in the DCI, the corresponding period during which PDCCH monitoring can be skipped can be predefined in the specification.

[0067] 4) The terminal 20 may use the period of existing parameters as the period that can be skipped. For example, the terminal 20 may use the corresponding value of the DRX-related parameters, such as 0 or 1, as the period that can skip the PDCCH, based on the value of the "Minimum applicable scheduling offset indicator" included in the DCI.

[0068] Furthermore, in step S31, when the terminal 20 determines whether the DCI includes scheduling information or does not include DCI, the determination can be made using any set value among the values ​​constituting the DCI. For example, if the set value of the scheduling frequency allocation is a specific value, the DCI can be determined to be DCI that does not include scheduling information. The specific value can be a special value that is not generally used.

[0069] Figure 7 : is a diagram showing an example (2) of PDCCH monitoring in an embodiment of the present invention. When cross-slot scheduling is applied, PDCCH monitoring during a notified or specified period can be skipped. For example, Figure 7 As shown, when cross-slot scheduling is used, PDCCH monitoring can be skipped from the end of the last PDCCH symbol or slot until the symbol or slot of the PDSCH specified by cross-slot scheduling. The period during which PDCCH monitoring can be skipped can be set in slot units or symbol units. Furthermore, for example, when cross-slot scheduling is used, terminal 20 can skip PDCCH monitoring for a period notified by higher-layer parameters and / or DCI.

[0070] "Cross-slot scheduling is applied" may be the cases shown in 1), 2) and 3) below.

[0071] 1) A case where at least one configuration parameter "minimumSchedulingOffset" for cross-slot scheduling is configured.

[0072] 2) In the activated BWP, all available entries in the TDRA (Time Domain Resource Allocation) table are in the case of cross-slot scheduling.

[0073] 3) Cross-slot scheduling is performed through DCI.

[0074] Through the above-mentioned embodiments, the terminal 20 can skip PDCCH monitoring according to higher layer parameters and / or DCI, etc.

[0075] That is, in a wireless communication system, it is possible to reduce the power consumed in monitoring the control signal.

[0076] (Functional Structure)

[0077] Next, the functional configuration examples of the base station 10 and terminal 20 that implement the above-described processing and operations are described. The base station 10 and terminal 20 include functions for implementing the above-described embodiments. However, the base station 10 and terminal 20 may each include only a portion of the functions described in the embodiments.

[0078] Base Station 10

[0079] Figure 8 FIG. 1 is a diagram showing an example of the functional configuration of the base station 10 according to the embodiment of the present invention. Figure 8 As shown, the base station 10 includes a transmitting unit 110 , a receiving unit 120 , a setting unit 130 , and a control unit 140 . Figure 8 The functional configuration shown is merely an example, and any functional divisions and names of functional units may be used as long as the operations according to the embodiments of the present invention can be performed.

[0080] The transmitting unit 110 has the function of generating a signal to be sent to the terminal 20 side and wirelessly transmitting the signal. In addition, the transmitting unit 110 sends inter-network node messages to other network nodes. The receiving unit 120 includes the function of wirelessly receiving various signals sent from the terminal 20 and obtaining, for example, higher-layer information from the received signals. In addition, 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. In addition, the receiving unit 120 receives inter-network node messages from other network nodes. The transmitting unit 110 and the receiving unit 120 can be collectively referred to as a communication unit.

[0081] The configuration unit 130 stores pre-configured configuration information and various configuration information to be transmitted to the terminal 20 in a storage device, and reads the configuration information from the storage device as needed. The configuration information includes, for example, information required for DRX and scheduling.

[0082] As described in the embodiment, the control unit 140 performs control related to DRX and scheduling. Functional units related to signal transmission in the control unit 140 may be included in the transmitter 110, and functional units related to signal reception in the receiver 120.

[0083] Terminal 20

[0084] Figure 9 FIG. 1 is a diagram showing an example of the functional configuration of the terminal 20 in the embodiment of the present invention. Figure 9 As shown, the terminal 20 includes a transmitting unit 210 , a receiving unit 220 , a setting unit 230 , and a control unit 240 . Figure 9 The functional configuration shown is merely an example, and any functional divisions and names of functional units may be used as long as the operations according to the embodiments of the present invention can be performed.

[0085] The transmitting unit 210 has the function of generating a transmission signal based on transmission data and wirelessly transmitting the transmission signal. 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, and the like transmitted from the base station 10. For example, 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), and the like to other terminals 20 for D2D communication, and the receiving unit 220 receives PSCCH, PSSCH, PSDCH, or PSBCH, etc. from other terminals 20. The transmitting unit 210 and the receiving unit 220 can be collectively referred to as a communication unit.

[0086] The configuration unit 230 stores various configuration information received by the receiving unit 220 from the base station 10 or the terminal 20 in a storage device and reads it from the storage device as needed. Furthermore, the configuration unit 230 also stores pre-set configuration information. The configuration information includes, for example, information required for DRX and PDCCH monitoring.

[0087] As described in the embodiment, the control unit 240 performs control related to DRX and PDCCH monitoring. Functional units related to signal transmission in the control unit 240 may be included in the transmitter 210, and functional units related to signal reception in the receiver 220.

[0088] (Hardware Structure)

[0089] The block diagram used in the description of the above embodiment ( Figure 8 and Figure 9 ) shows blocks in units of functions. These functional blocks (structural parts) are implemented by any combination of at least one of hardware and software. In addition, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented using a device that is physically or logically combined, or it can be implemented by connecting two or more physically or logically separated devices directly or indirectly (for example, using wired or wireless connections) and using these multiple devices. The functional block can also be implemented by combining software with the above-mentioned one device or the above-mentioned multiple devices.

[0090] Functionally, these include, but are not limited to, judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning. For example, a functional block (structural unit) that enables the transmission function is called a transmitting unit or a transmitter. In short, as described above, there is no particular limitation on the implementation method.

[0091] For example, the base station 10 , the terminal 20 , and the like in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 10This figure shows an example of the hardware configuration of a base station 10 and a terminal 20 according to one embodiment of the present disclosure. The base station 10 and the terminal 20 described above may also be configured as a computer device that physically includes a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus 1007.

[0092] In the following description, the word "device" can be replaced with "circuit," "device," "unit," etc. The hardware configuration of the base station 10 and the terminal 20 may include one or more of the devices shown in the drawings, or may exclude some of the devices.

[0093] The various functions in 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 the reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.

[0094] Processor 1001 controls the entire computer by, for example, executing an operating system. Processor 1001 may also be comprised of a central processing unit (CPU) including interfaces with peripheral devices, a control unit, a computing unit, registers, and the like. For example, control unit 140 and control unit 240 described above may also be implemented by processor 1001.

[0095] Furthermore, the processor 1001 reads a program (program code), a software module, or data from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and performs various processes accordingly. As a program, a program that causes the computer to execute at least a part of the actions described in the above embodiments is used. For example, Figure 8 The control unit 140 of the base station 10 shown may also be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. 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 executed by the processor 1001. Regarding the various processes described above, although they are described as being executed by a single processor 1001, they can also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 can also be implemented on one or more chips. Furthermore, the program can be transmitted from a network via a telecommunications line.

[0096] The storage device 1002 is a computer-readable recording medium and may be composed of, for example, at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The storage device 1002 may also be referred to as a register, cache, main memory (main storage device), etc. The storage device 1002 can store executable programs (program code), software modules, etc., for implementing the communication method according to one embodiment of the present disclosure.

[0097] The auxiliary storage device 1003 is a computer-readable recording medium, and can be composed of at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a floppy disk, a magneto-optical disk (e.g., a compact disc, a digital versatile disc, a Blu-ray (registered trademark) disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a Floppy (registered trademark) disk, a magnetic stripe, etc. The above-mentioned recording medium can be, for example, other appropriate media such as a database, a server, etc. that includes at least one of the storage device 1002 and the auxiliary storage device 1003.

[0098] Communication device 1004 is hardware (a transceiver) used to facilitate communication between computers via at least one of a wired network and a wireless network. For example, it may also be referred to as a network device, a network controller, a network card, or a communication module. Communication device 1004 may include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, communication device 1004 may also implement a transceiver antenna, an amplifier, a transceiver, a transmission path interface, and the like. The transceiver may be physically or logically separated in the transmitter and receiver.

[0099] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to the outside (e.g., a display, speaker, LED light, etc.). Alternatively, the input device 1005 and the output device 1006 may be integrally formed (e.g., a touch panel).

[0100] Furthermore, the processor 1001, the storage device 1002, and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using separate buses for each device.

[0101] Furthermore, the base station 10 and the terminal 20 may 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 an FPGA (Field Programmable Gate Array), and may implement some or all of the functional blocks using this hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0102] (Summary of Implementation Methods)

[0103] As described above, according to an embodiment of the present invention, a terminal is provided, which includes: a receiving unit that receives a signal in a physical layer containing information related to monitoring of a control channel from a base station; and a control unit that monitors the control channel sent from the base station, and the control unit sets a period during which the control channel is not monitored based on the information.

[0104] With the above configuration, the terminal 20 can skip PDCCH monitoring based on higher layer parameters and / or DCI, etc. In other words, in the wireless communication system, the power consumed by monitoring control signals can be reduced.

[0105] When the signal in the physical layer does not include scheduling information, the control unit may set a period during which the control channel is not monitored. With this configuration, the terminal 20 can skip PDCCH monitoring based on higher layer parameters and / or DCI using efficient signaling.

[0106] The information may correspond to a field indicating the minimum offset used for cross-slot scheduling. If the signal in the physical layer does not include scheduling information, the control unit may reinterpret the field and set a period during which the control channel is not monitored. This structure allows the terminal 20 to skip PDCCH monitoring based on higher-layer parameters and / or DCI using efficient signaling.

[0107] The information may correspond to a field indicating a minimum offset used for cross-slot scheduling. The receiving unit may receive a signal from a higher layer from the base station. If the signal from the higher layer does not include parameters used for cross-slot scheduling, the control unit may reinterpret the field and set a period during which the control channel is not monitored. This configuration allows terminal 20 to skip PDCCH monitoring based on higher layer parameters and / or DCI using efficient signaling.

[0108] When cross-slot scheduling is applied, the control unit may set a period for not monitoring the control channel based on the information. With this configuration, the terminal 20 can skip PDCCH monitoring based on higher layer parameters and / or DCI using efficient signaling.

[0109] A communication method is provided, in which a terminal performs the following steps: a receiving step of receiving a signal in a physical layer containing information related to monitoring of a control channel from a base station; and a control step of monitoring the control channel sent from the base station, the control step including a step of setting a period during which the control channel is not monitored based on the information.

[0110] With the above configuration, the terminal 20 can skip PDCCH monitoring based on higher layer parameters and / or DCI, etc. In other words, in the wireless communication system, the power consumed by monitoring control signals can be reduced.

[0111] (Supplementary Implementation Methods)

[0112] The above describes the embodiments of the present invention, but the disclosed invention is not limited to such embodiments, and a person skilled in the art should understand various variations, modifications, substitutions, replacements, etc. In order to facilitate understanding of the invention, specific numerical examples are used for description, but unless otherwise specified, these numerical values ​​are only examples, and any appropriate value may also be used. The distinction between the items in the above description is not essential to the present invention. Matters recorded in two or more items can be combined and used as needed, and matters recorded in one item can be applied to matters recorded in other items (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 actions of multiple functional units can be physically performed by one component, or the actions of one functional unit can be physically performed by multiple components. Regarding the processing procedures described in the embodiments, the order of processing can be reversed if there is no contradiction. For the convenience of explaining the processing, the base station 10 and the terminal 20 are described using functional block diagrams, but such devices can also be implemented using hardware, software, or a combination thereof. The software that operates by the processor of the base station 10 according to the embodiment of the present invention and the software that operates by the processor of the terminal 20 according to the embodiment of the present invention can also be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server and other appropriate storage media.

[0113] In addition, the notification of information is not limited to the form / implementation method described in the present disclosure, and other methods may also be used. For example, the notification of information can be implemented through physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), high-layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals or a combination thereof. In addition, RRC signaling may also be referred to as an RRC message, for example, it may also be an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0114] Each form / embodiment described in this disclosure may 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-WideBand), Bluetooth (registered trademark), systems using other appropriate systems, and next-generation systems extended therefrom. Furthermore, a combination of multiple systems (for example, a combination of at least one of LTE and LTE-A with 5G) may also be applied.

[0115] The processing procedures, timings, and flows of each form / implementation described in this specification may be performed in a different order unless there is a conflict. For example, the methods described in this disclosure use an illustrative order to present the elements of various steps, but are not limited to the specific order presented.

[0116] In this specification, specific actions performed by base station 10 may be performed by its upper node, depending on the situation. In a network consisting of one or more network nodes including base station 10, various actions performed to communicate with terminal 20 may be performed by at least one of base station 10 and other network nodes other than base station 10 (e.g., MME or S-GW, but not limited thereto). While the above example illustrates a single other network node other than base station 10, the other network node may also be a combination of multiple other network nodes (e.g., MME and S-GW).

[0117] The information or signals described in this disclosure can be output from a higher layer (or lower layer) to a lower layer (or higher layer), and can also be input or output via multiple network nodes.

[0118] 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.

[0119] The determination in the present disclosure may be performed using a value represented by one bit (0 or 1), a Boolean value (Boolean: true or false), or a comparison of numerical values ​​(for example, comparison with a predetermined value).

[0120] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, shall be interpreted broadly to refer to instructions, sets of instructions, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0121] Furthermore, software, commands, information, and the like may be transmitted and received via a transmission medium. For example, if software is transmitted from a web page, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, DSL, etc.) and a wireless technology (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0122] The information, signals, etc. described in this disclosure may also be represented using any of a variety of different technologies. For example, data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be referred to in the entire description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0123] In addition, the terms used in this disclosure and those necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.

[0124] The terms "system" and "network" used in this disclosure may be used interchangeably.

[0125] In addition, the information, parameters, etc. described in this disclosure may be represented by absolute values, relative values ​​relative to predetermined values, or other corresponding information. For example, wireless resources may also be indicated by indexes.

[0126] The names used for the above parameters are not limiting in any way. Furthermore, the formulas and the like using these parameters may sometimes differ from those explicitly stated in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by appropriate names, and the various names assigned to these various channels and information elements are not limiting in any way.

[0127] In this disclosure, terms such as "base station (BS)," "wireless base station," "base station apparatus," "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. Base stations may also be referred to as macrocells, small cells, femtocells, and picocells.

[0128] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the base station's overall coverage area can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (for example, a small base station for indoor use (RRH: Remote Radio Head)). Terms such as "cell" or "sector" refer to a portion or the entire coverage area of ​​at least one of the base station and base station subsystem that provide communication services within the coverage area.

[0129] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0130] For mobile stations, those skilled in the art sometimes also use the following terms to refer to them: 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.

[0131] 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. In addition, at least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), a mobile body that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, 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.

[0132] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, regarding a structure in which the communication between a base station and a user terminal is replaced by communication between multiple terminals 20 (for example, also referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything, etc.), the various forms / implementations of the present disclosure may also be applied. In this case, it may also be configured such that the terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels.

[0133] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station may also have the functions of the user terminal described above.

[0134] The terms “determining” and “determining” used in this disclosure sometimes also include situations where a variety of actions are performed. For example, “determining” and “judging” may include situations where matters such as judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (for example, searching in a table, database or other data structure), and ascertaining are considered to be “determined” or “determined”. In addition, “determining” and “receiving” (for example, receiving information), transmitting (for example, sending information), inputting, outputting, and accessing (for example, accessing data in a memory) are considered to be “determined” or “determined”. In addition, “determining” and “resolving” may include situations where matters such as selecting, choosing, establishing, and comparing are considered to be “determined” or “determined”. That is, "judgment" and "decision" can include "judgment" and "decision" of any action. In addition, "judgment (decision)" can be replaced by "assuming (assuming)", "expecting (expecting)", and "considering (considering)".

[0135] The terms "connected", "coupled" or all variations of these terms are intended to indicate any direct or indirect connection or combination between two or more elements, including the situation where there is one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The combination or connection between elements can be a physical combination or connection, a logical combination or connection, or a combination of these. For example, "access" can be used to replace "connection". In the context of the present disclosure, two elements can be considered to be "connected" or "coupled" to each other by using at least one of one or more wires, cables and printed electrical connections, and as some non-limiting and non-inclusive examples, by using electromagnetic energy such as electromagnetic energy with wavelengths in the wireless frequency domain, microwave region and light (including both visible and invisible) region.

[0136] The reference signal may be referred to as RS (Reference Signal) for short, or may be called a pilot signal depending on the applied standard.

[0137] The phrase "according to" used in this disclosure does not mean "only according to" unless otherwise expressly stated. In other words, the phrase "according to" means both "only according to" and "at least according to."

[0138] 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 those elements. These designations are used in this disclosure as a convenient way to distinguish between two or more elements. Therefore, a reference to a first and a second element does not imply that only two elements can be used or that the first element must precede the second element in any manner.

[0139] The “unit” in each of the above-mentioned device structures can be replaced with a “section”, “circuit”, “device”, etc.

[0140] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, the term "or" used in this disclosure does not mean an exclusive OR.

[0141] A radio frame can be composed of one or more frames in the time domain. One or more frames in the time domain can also be called a subframe. A subframe can also be composed of one or more time slots in the time domain. A subframe can be of a fixed duration (e.g., 1 ms) independent of numerology.

[0142] A parameter set may also be a communication parameter applied to at least one of the transmission and reception of a signal or channel. For example, a parameter set may 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 performed by the transceiver in the frequency domain, specific windowing performed by the transceiver in the time domain, and the like.

[0143] In the time domain, 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.) A slot may be a time unit based on a parameter set.

[0144] A time slot may also contain multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Furthermore, a mini-slot may also be referred to as a sub-slot. A mini-slot may also consist of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as PDSCH (or PUSCH) mapping type B.

[0145] Radio frame, subframe, time slot, mini-time slot, and symbol all represent time units for signal transmission. Radio frame, subframe, time slot, mini-time slot, and symbol may also be referred to by other corresponding names.

[0146] For example, a subframe can also be called a Transmission Time Interval (TTI), multiple consecutive subframes can also be called a TTI, and a slot or minislot can also be called a TTI. That is, at least one of a subframe and a TTI can be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. Furthermore, the unit representing a TTI can be a slot, a minislot, or the like, rather than a subframe.

[0147] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communications. For example, in the LTE system, a base station schedules each terminal 20 by allocating wireless resources (such as the frequency bandwidth and transmit power available to each terminal 20) in units of TTI. The definition of TTI is not limited to this.

[0148] A TTI can be a unit of time for transmitting data packets (transport blocks), code blocks, code words, etc. after channel coding, or a unit of processing for scheduling, link adaptation, etc. Furthermore, when a TTI is assigned, the time interval (e.g., the number of symbols) to which a transport block, code block, code word, etc. is actually mapped can be shorter than the TTI.

[0149] Furthermore, when one time slot or one mini-time slot is referred to as a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-time slots) may constitute the minimum time unit for scheduling. Furthermore, the number of time slots (mini-time slots) constituting the minimum time unit for scheduling may also be controlled.

[0150] A TTI having a time length of 1 ms may be referred to as 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 time slot, etc. A TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a subslot, a time slot, etc.

[0151] In addition, long TTI (e.g., normal TTI, subframe, etc.) can be replaced by TTI with a time length exceeding 1ms, and short TTI (e.g., shortened TTI, etc.) can also be replaced by TTI with a TTI length smaller than that of long TTI and greater than 1ms.

[0152] A resource block (RB) is a unit of resource allocation in the time and frequency domains. In the frequency domain, it may also 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 be determined based on the parameter set.

[0153] In addition, the time domain of an RB may include one or more symbols, and may be of length 1 slot, 1 minislot, 1 subframe, or 1 TTI. 1 TTI, 1 subframe, etc. may also be composed of one or more resource blocks.

[0154] In addition, one or more RBs may also be referred to as a physical resource block (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, etc.

[0155] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0156] A bandwidth part (BWP) (also known as a fractional bandwidth) can also represent a subset of contiguous common resource blocks (RBs) used for a parameter set within a carrier. Common RBs can also be identified by their index relative to the common reference point of the carrier. PRBs can also be defined by a BWP and numbered within that BWP.

[0157] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). For a UE, one or more BWPs may be configured within one carrier.

[0158] At least one of the configured BWPs may be activated, and the UE may not assume that it will transmit or receive predetermined signals / channels other than the activated BWP.

[0159] The above-described structures of radio frames, subframes, slots, mini-slots, and symbols are merely examples. For example, various changes may be made to the structures including the number of subframes in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots within a slot, the number of symbols and RBs within a slot or mini-slot, the number of subcarriers within an RB, the number of symbols within a TTI, the symbol length, and the cyclic prefix (CP) length.

[0160] In the present disclosure, when an article is added by translation, such as a, an, and the in English, the present disclosure also includes cases where the noun following the article is in plural form.

[0161] In this disclosure, the phrase "A and B are different" can also mean "A and B are different from each other." Furthermore, the phrase can also mean "A and B are each different from C." Terms such as "separate" and "bound" can also be interpreted similarly as meaning "different."

[0162] Each form / implementation described in this disclosure may be used individually or in combination, and may be switched depending on the execution. In addition, notification of scheduled information is not limited to being performed explicitly (e.g., notification of "yes X"), but may also be performed implicitly (e.g., not notifying the scheduled information).

[0163] In the present disclosure, PDCCH is an example of a control channel, DCI is an example of a signal in the physical layer, and RRC layer parameters are an example of a signal in a higher layer.

[0164] While the present disclosure has been described in detail above, it should 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 in various modifications and variations 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 illustrative purposes only and does not have any limiting meaning on the present disclosure.

[0165] Description of labels:

[0166] 10 base stations

[0167] 110 Sending Department

[0168] 120 Receiving Department

[0169] 130 Setting Department

[0170] 140 Control Department

[0171] 20 Terminal

[0172] 210 Sending Department

[0173] 220 Receiving Department

[0174] 230 Setting Department

[0175] 240 Control Department

[0176] 1001 Processor

[0177] 1002 Storage Device

[0178] 1003 Auxiliary storage device

[0179] 1004 Communication device

[0180] 1005 Input Device

[0181] 1006 Output Device

Claims

1. A terminal, wherein: The terminal has: a receiving unit configured to receive, from a base station, higher layer parameters related to monitoring of a downlink control channel and downlink control information; as well as a control unit configured to set a period for skipping monitoring of a downlink control channel transmitted from the base station based on the higher layer parameter and a field included in the downlink control information, The control unit selects, based on the field, any one of a plurality of periods set according to the higher layer parameter as a period for skipping monitoring of a downlink control channel transmitted from the base station. The monitoring of the downlink control channel corresponds to both the random access radio network temporary identifier, i.e., RA-RNTI, and the cell radio network temporary identifier, i.e., C-RNTI. When the RA-RNTI is applied, the control unit does not skip the monitoring of the downlink control channel sent from the base station. When the C-RNTI is applied, the control unit skips the monitoring of the downlink control channel sent from the base station.

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