Terminal

Abstract

In the present invention, a UE (200) receives control information over a PDCCH, and controls the monitoring of the PDCCH. Even in a skip state in which PDCCH monitoring is skipped, the UE (200) executes PDCCH monitoring if conditions are met.

Description

[Technical field]

[0001] The present invention relates to a terminal for performing wireless communication. [Background technology]

[0002] The 3rd Generation Partnership Project (3GPP) has developed specifications for Long Term Evolution (LTE), and is also developing specifications for LTE-Advanced (hereinafter, LTE-Advanced will be referred to as LTE) with the aim of further increasing speeds of LTE, as well as the 5th generation mobile communication system (5G, also known as New Radio (NR) or Next Generation (NG)).

[0003] In the Study Item (SI) of Release 16 of 3GPP, in order to realize more flexible and dynamic power saving than Discontinuous Reception (DRX), so-called PDCCH skipping, which omits monitoring of the downlink control channel, specifically, the PDCCH (Physical Downlink Control Channel), is considered (Non-Patent Document 1).

[0004] PDCCH skipping is instructed to a terminal (User Equipment, UE) from the network via the PDCCH. When PDCCH skipping is configured, the terminal omits monitoring the PDCCH, specifically, omits decoding the PDCCH. This can effectively reduce the power consumption of the terminal. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] "TP capturing RAN2 agreements and recommendations", R2-1908509, 3GPP TSG-RAN WG2 Meeting#106, 3GPP, May 2019 Summary of the Invention

[0006] However, PDCCH skipping has the following problems.

[0007] First, PDCCH skipping is instructed by the network regardless of whether the terminal is in a DRX state in the medium access control layer (MAC). Therefore, since PDCCH monitoring (decoding) is an operation in the physical layer (PHY, L1) (see 3GPP TS38.321), if PDCCH monitoring is omitted by PDCCH skipping, the MAC entity cannot receive control information via the PDCCH even if it is in Active Time.

[0008] Secondly, PDCCH skipping is assumed to be instructed by the network when the network determines that the terminal does not need to send or receive data. Therefore, even if an opportunity arises for a terminal that the network cannot recognize to send or receive data, PDCCH monitoring will not resume until PDCCH skipping is released, which may result in communication delays.

[0009] Thirdly, if a terminal erroneously receives a PDCCH skipping instruction intended for another terminal, a mismatch occurs between the state recognized by the terminal and the network (specifically, the gNB (radio base station)), and control information via the PDCCH cannot be received.

[0010] Therefore, the present invention has been made in consideration of such circumstances, and aims to provide a terminal that can monitor the downlink control channel as necessary, even when the terminal is set to an omission state in which monitoring of the downlink control channel is omitted.

[0011] One aspect of the present disclosure is a terminal (UE 200) that includes a receiver (radio receiver 220) that receives control information via a downlink control channel (PDCCH) and a controller (controller 250) that controls monitoring of the downlink control channel, and the controller is a terminal (UE 200) that performs monitoring of the downlink control channel when conditions are met, even in an omission state in which monitoring of the downlink control channel is omitted. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a diagram showing an overall schematic configuration of a wireless communication system 10. As shown in FIG. [Diagram 2] FIG. 2 is a functional block diagram of the UE 200. [Diagram 3] FIG. 3 is a diagram showing an example (part 1) of a basic operation of the UE 200 when PDCCH skipping is set. [Figure 4] FIG. 4 is a diagram showing a basic operation example (part 2) of the UE 200 when PDCCH skipping is set. [Diagram 5] FIG. 5 is a diagram showing an example of an improved operation of the UE 200 when PDCCH skipping is set. [Figure 6] FIG. 6 is a diagram illustrating an example of a hardware configuration of the UE 200. As shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment will be described with reference to the drawings. Note that the same or similar reference numerals are used to designate the same functions or configurations, and the description thereof will be omitted as appropriate.

[0014] (1) Overall configuration of wireless communication system 1 is a schematic diagram of an overall configuration of a wireless communication system 10 according to the present embodiment. The wireless communication system 10 is a wireless communication system conforming to 5G New Radio (NR), and includes a Next Generation-Radio Access Network 20 (hereinafter, NG-RAN 20) and a terminal 200 (User Equipment 200, hereinafter, UE 200).

[0015] The NG-RAN 20 includes a radio base station 100 (hereinafter, gNB 100). Note that the specific configuration of the radio communication system 10, including the number of gNBs and UEs, is not limited to the example shown in FIG.

[0016] The NG-RAN 20 actually includes a plurality of NG-RAN nodes, specifically, gNBs (or ng-eNBs), and is connected to a 5G-compliant core network (5GC, not shown). The NG-RAN 20 and the 5GC may be simply referred to as a network.

[0017] The gNB 100 is a radio base station conforming to 5G, and executes 5G radio communication with the UE 200. The gNB 100 and the UE 200 can support Massive MIMO, which generates a more directional beam by controlling radio signals transmitted from multiple antenna elements, Carrier Aggregation (CA), which uses multiple component carriers (CCs) by bundling them, and Dual Connectivity (DC), which simultaneously communicates between the UE and each of multiple NG-RAN Nodes.

[0018] In addition, UE 200 implements Discontinuous Reception (DRX), which is a communication technology that reduces power consumption when waiting for an incoming call. When UE 200 waits for an incoming call, it attempts to receive a paging message from the network once every certain period (DRX period). Paging refers to the procedure and signal that calls UE 200 that is waiting for an incoming call.

[0019] In this case, when the UE 200 receives a paging message addressed to itself, it cancels the standby state and starts communication with the network. In the DRX (discontinuous reception) operation, the UE 200 stops transmitting and receiving wireless signals during the period when it is not trying to receive paging messages, thereby reducing power consumption compared to the case where it always tries to receive paging messages.

[0020] In addition, DRX may include eDRX (Extended Discontinuous Reception), which improves the effect of reducing power consumption by further reducing the frequency of receiving paging.

[0021] In addition, in this embodiment, PDCCH skipping is introduced to omit monitoring of a downlink control channel, specifically, a PDCCH (Physical Downlink Control Channel). PDCCH skipping is individually instructed to the UE 200 from the network. When PDCCH skipping is set, the UE 200 omits monitoring of the PDCCH, specifically, omits decoding of the PDCCH. This can effectively reduce power consumption of the UE 200.

[0022] (2) Functional block configuration of wireless communication system Next, a description will be given of a functional block configuration of the wireless communication system 10. Specifically, a description will be given of a functional block configuration of the UE 200. FIG.

[0023] As shown in FIG. 2, the UE 200 includes a radio transmitting unit 210, a radio receiving unit 220, an L1 processing unit 230, a MAC processing unit 240, and a control unit 250.

[0024] The radio transmitting unit 210 transmits an uplink signal (UL signal) conforming to NR. The radio receiving unit 220 receives a downlink signal (DL signal) conforming to NR.

[0025] Specifically, the wireless transmitting unit 210 and the wireless receiving unit 220 perform wireless communication via a control channel or a data channel.

[0026] The control channels include a Physical Downlink Control Channel (PDCCH), a Physical Uplink Control Channel (PUCCH), a Random Access Channel (RACH, Downlink Control Information (DCI) including a Random Access Radio Network Temporary Identifier (RA-RNTI)), and a Physical Broadcast Channel (PBCH).

[0027] The data channels include a Physical Downlink Shared Channel (PDSCH) and a Physical Downlink Shared Channel (PUSCH).

[0028] In this embodiment, the wireless receiving unit 220 constitutes a receiving unit that receives control information via a PDCCH (downlink control channel). The control information includes downlink control information (DCI) and the like. DCI is control information transmitted in a downlink, including scheduling information required for each user (UE) to demodulate data, information on data modulation and channel coding rate, and the like. The control information may also include information instructing PDCCH skipping.

[0029] The L1 processing unit 230 executes processing in layer 1, that is, the physical layer (PHY). In particular, in this embodiment, the L1 processing unit 230 executes control related to reception of the PDCCH and control related to transmission (including a scheduling request (SR)) of the PUCCH (uplink control channel).

[0030] The MAC processing unit 240 executes processing in a medium access control layer (MAC). In particular, in this embodiment, the MAC processing unit 240 executes processing related to DRX.

[0031] Specifically, when using the DRX operation, the MAC processing unit 240 (which may be called a MAC entity) monitors the PDCCH according to a predetermined condition. When the UE 200 is in a connected state (RRC_CONNECTED) in the radio resource control layer (RRC) and DRX is configured, the MAC processing unit 240 intermittently monitors the PDCCH using the DRX operation for all activated serving cells. When DRX is not configured, the MAC processing unit 240 monitors the PDCCH according to the provisions of 3GPP TS38.213.

[0032] The control unit 250 controls each functional block constituting the UE 200. In particular, in this embodiment, the control unit 250 controls the monitoring of the PDCCH (including PDCCH skipping) by the MAC processing unit 240. The control unit 250 also controls the DRX operation. Note that the control unit 250 may include functions of a radio link control layer (RLC) and an RRC layer.

[0033] The control unit 250 can control the DRX operation by setting the following parameters, for example.

[0034] drx-onDurationTimer: Duration at the start of a DRX cycle drx-SlotOffset: Delay before starting drx-onDurationTimer drx-InactivityTimer: The period after a PDCCH opportunity when the PDCCH indicates a new UL or DL ​​transmission to the MAC entity. Also, if a DRX cycle is set, Active Time includes the following times:

[0035] drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL, or ra-ContentionResolutionTimer is running A Scheduling Request (SR) has been sent on the PUCCH and is pending No PDCCH indicating a new transmission addressed to the MAC entity's Cell-Radio Network Temporary Identifier (C-RNTI) has been received after successful reception of a random access response to a contention-based random access preamble that was not selected by the MAC entity. Furthermore, the control unit 250 executes control related to the above-mentioned PDCCH skipping. Note that PDCCH skipping may be called by other names. For example, it may be expressed as omission, cancellation, postponement, suspension, or stop of reception, monitoring, or decoding of the PDCCH.

[0036] Specifically, the control unit 250 receives a command (hereinafter, for convenience, referred to as a PDCCH skipping command) that instructs the UE 200 to skip the PDCCH via the PDCCH. The control unit 250 omits monitoring of the PDCCH based on the received PDCCH skipping command. Note that the PDCCH skipping command does not necessarily have to be received via the PDCCH if there is another receivable control channel.

[0037] Furthermore, even in an omission state in which monitoring of the PDCCH is omitted, the control unit 250 executes monitoring of the PDCCH when the conditions are met. More specifically, the control unit 250 executes monitoring of the PDCCH in an omission state in which monitoring of the PDCCH is omitted, in response to a notification from the medium access control layer (MAC) to the physical layer (PHY). That is, under the control of the control unit 250, the MAC processing unit 240 instructs the L1 processing unit 230 to monitor the PDCCH in a state in which PDCCH skipping is set.

[0038] The condition may be transmission via uplink (UL), or a random access procedure, etc. The condition will be described in detail further below.

[0039] That is, when performing transmission via uplink or a random access procedure, even if PDCCH skipping is set, the control unit 250 can monitor the PDCCH. In this case, the execution of the PDCCH monitoring may be expressed as resuming the PDCCH monitoring, or may be expressed as canceling or suspending the PDCCH skipping.

[0040] Furthermore, in the state where PDCCH monitoring is omitted, the control unit 250 may execute, that is, resume, monitoring of the downlink control channel by transitioning to a bandwidth different from the bandwidth used by the UE 200.

[0041] Here, the "bandwidth" may substantially mean a BWP (BandWidth Part). The BWP includes a bandwidth, a frequency position, and a subcarrier interval of a frequency to be used by the UE 200 for communication. The BWP is notified by the gNB 100 using higher layer (such as RRC) signaling or L1 signaling. The BWP may be set differently for each UE 200, or may be set commonly for multiple UEs 200.

[0042] (3) Operation of wireless communication system Next, a description will be given of the operation of the wireless communication system 10. Specifically, a description will be given of the operation of the UE 200 in a case where PDCCH skipping for omitting monitoring of the PDCCH is configured for the UE 200.

[0043] Specifically, a basic operation of PDCCH skipping will be described, and then an operation of the UE 200 to autonomously recover from PDCCH skipping will be described.

[0044] (3.1) Basic operation Fig. 3 shows a basic operation example (part 1) of the UE 200 when PDCCH skipping is configured. Specifically, the operation example shown in Fig. 3 (and the following operation examples are similar) is a case where the gNB 100 instructs the UE 200 to perform PDCCH skipping.

[0045] As shown in FIG. 3, gNB100 instructs UE200 to skip the PDCCH by transmitting a PDCCH skipping command to UE200.

[0046] Here, it is assumed that PDCCH skipping is set by a PDCCH skipping command from the network (gNB 100) when the network determines that data transmission / reception by the UE 200 is not necessary. Note that the PDCCH skipping command is a provisional name and may be called by another name.

[0047] When the UE 200 receives the PDCCH skipping command, the UE 200 omits (skips) monitoring the PDCCH until time Ta. Here, the instruction of PDCCH skipping by the network is executed regardless of the DRX state in the MAC layer (UE-MAC) of the UE 200.

[0048] For this reason, since PDCCH monitoring (decoding) is an operation at the physical layer (UE-L1 in the figure), if PDCCH monitoring is omitted by PDCCH skipping, the MAC entity cannot receive control information via PDCCH even if it is within Active Time.

[0049] Furthermore, as described above, when PDCCH skipping is set by a PDCCH skipping command from the network (gNB100), there is a possibility that communication delays will occur because PDCCH monitoring is not performed (resumes) until PDCCH skipping is released, specifically, until time Ta.

[0050] For example, transmission of a scheduling request (SR) via the PUCCH, a random access procedure, and transmission of a configured grant may be delayed.

[0051] Specifically, in SR via PUCCH, PDCCH monitoring is required to receive a UL grant. In addition, in the random access procedure, PDCCH monitoring is required to receive a random access response (Msg2) and Msg4. Furthermore, in the case of a configured grant, PDCCH monitoring is required to receive a UL grant for retransmission.

[0052] Note that configured grant differs from dynamically configured grant (dynamic grant) in that the following two types are defined:

[0053] · Configured grant Type 1: Uplink grant is provided by RRC and stored as configured uplink grant · configured grant Type 2: uplink grant is provided by PDCCH. It is stored or cleared as configured uplink grant based on L1 signaling indicating activation or deactivation of configured uplink grant.

[0054] In FIG. 3, because PDCCH skipping is configured, even if UE 200 transmits a scheduling request (SR) via an uplink PUCCH, scheduling based on the scheduling request (SR) cannot be performed until time Ta (see the diagonal arrow in the figure).

[0055] Fig. 4 shows a basic operation example (part 2) of the UE 200 when PDCCH skipping is set. Specifically, Fig. 4 shows an example in which the UE 200 erroneously receives a PDCCH skipping command for another UE. In this embodiment, the PDCCH skipping command is assumed to be transmitted from the gNB 100 via the PDCCH, and is physical layer control information, so there is a high possibility of erroneous reception compared to a higher layer. Note that this is not limited to the case of erroneously receiving a PDCCH skipping command for another UE, but also applies to the case in which the UE 200 erroneously interprets other control content as a PDCCH skipping command.

[0056] In this way, when UE 200 erroneously receives a PDCCH skipping command for another UE, a state mismatch occurs between gNB 100 and UE 200. In this case, gNB 100 does not recognize that UE 200 is in a state where PDCCH monitoring is omitted (which may be called a PDCCH skipping state), and therefore even if gNB 100 transmits a UL grant to UE 200 in response to a scheduling request (SR) transmitted from UE 200, UE 200 cannot receive the UL grant because UE 200 is not monitoring the PDCCH. Note that, as described in the basic operation example (part 1), even if UE 200 is in a state where PDCCH monitoring is omitted (PDCCH skipping state), UE 200 can transmit an SR via PUCCH during Active Time.

[0057] (3.2) Example of improved operation Fig. 5 shows an example of an improved operation of UE 200 when PDCCH skipping is set. Specifically, Fig. 5 shows an example of an improved operation that solves the problem in the basic operation example (see Figs. 3 and 4) of UE 200 when the above-mentioned PDCCH skipping is set.

[0058] In this operation example, even if PDCCH skipping is instructed from the network and PDCCH skipping is set, when a specific condition is met, UE 200 autonomously stops or suspends PDCCH skipping. In other words, even if PDCCH skipping is set, UE 200 executes or resumes monitoring of the PDCCH.

[0059] As shown in Fig. 5, UE 200 monitors the PDCCH when the condition is met even in an omission state in which monitoring of the PDCCH is omitted (UE-L1 "PDCCH skipping" in the figure). Therefore, it becomes possible to transmit and receive a scheduling request (SR) and a UL grant without waiting for the time Ta at which PDCCH skipping ends (see the diagonal line arrow in the figure).

[0060] Specific control will be described below. In the PDCCH skipping state, the UE 200 monitors the PDCCH using the following as a trigger (that is, meaning that a condition is met).

[0061] · Send scheduling request (PUCCH-SR) ·UL transmission using configured grant During the random access procedure · Random access preamble (MsgA) transmission Start receiving a Random Access Response (RAR) (e.g., start of ra-ResponseWindow or reception of DL signals (PDCCH and PDSCH, etc.) with a given RNTI) - Transmit PUSCH as instructed by RAR UL grant Start of Msg4 (MsgB) reception (e.g., ra-ContentionResolutionTimer, MsgB reception window start) Note that MsgA may be expressed by other terms, such as a message including at least one of the contents of Msg1 and Msg3 of 4-step RACH (Contention-based RA), a message transmitted by UE 200 in 2-step RACH (Contention-free RA), or a message including an RA preamble and a PUSCH.

[0062] MsgB may also be expressed by other terms, such as a message including at least one of the contents of Msg2 and Msg4 of 4 step RACH (Contention-based RA), a message received by 2 step RACH (Contention-free RA) UE 200, or a message including at least one of a Fallback message and a Contention resolution. Furthermore, the above-mentioned monitoring of the PDCCH may be executed (resumed) by the UE 200 transitioning to a predetermined BWP, that is, activating a BWP other than the BWP in use.

[0063] For example, a BWP in which no PDCCH is set may be defined, and a transition to the BWP may be made. Also, when a predetermined time has elapsed after transition to the BWP, a transition to a predetermined BWP (e.g., initial / default BWP, BWP designated by the network (RRC, PDCCH, etc.) may be made. Furthermore, the "predetermined time" may differ depending on the BWP to be transitioned to.

[0064] Furthermore, the above-mentioned trigger may be initiated within UE 200 in any of the following ways:

[0065] ·Notification from MAC layer to physical layer (L1) The notification may be indicated by stopping (stopping, suspending) or canceling (canceling, aborting) the PDCCH skipping, or by executing, starting, or resuming monitoring of the PDCCH, or by invalidating the PDCCH skipping command.

[0066] Physical layer (L1) judges In this case, the physical layer recognizes the type or content of the channel transmitted by the UE 200 (for example, PUCCH-SR, Physical RACH (PRACH), etc.) from at least one of them. The physical layer may also notify the MAC layer that the monitoring of the PDCCH has been resumed.

[0067] Furthermore, resumption of PDCCH skipping after resuming monitoring of the PDCCH may be realized by any of the following methods.

[0068] ·Notification from MAC layer to physical layer (L1) In this case, any of the following methods may be used.

[0069] When a UL grant is received after a PUCCH-SR is transmitted or after a certain period of time has elapsed -When a certain time has elapsed after UL transmission using a configured grant (for example, after the configured grant timer or drx-Retrasmission Timer has expired) When receiving RAR or after a certain period of time has elapsed since receiving RAR After transmitting PUSCH instructed by RAR UL grant (or after a specified time period) Upon receiving Msg4 (MsgB) or after a certain period of time has elapsed since receiving Msg4 (e.g., contention resolution timer, MsgB reception window expiry, or after sending HARQ feedback (ACK, etc.)) Physical layer (L1) judges In this case, the physical layer resumes monitoring the PDCCH when receiving a DL signal of interest according to the channel type or content transmitted by the UE 200. The physical layer may also notify the MAC layer that it has resumed monitoring the PDCCH.

[0070] Alternatively, the physical layer may resume monitoring the PDCCH using a timer. In this case, the timer setting value may be different after each procedure. The setting value may be notified from the MAC layer or may be set by the RRC layer.

[0071] Furthermore, the decision to stop and / or resume PDCCH skipping may be made by a different layer (MAC or L1).

[0072] (3.3) Example of changes Furthermore, the above-mentioned improvement operation example may be modified as follows. For example, the above-mentioned improvement operation example may be applied only to a certain case. In terms of an event, the following options are available:

[0073] Option 1: Contention-based random access procedure only Option 2: Contention-based and contention-free random access procedures Option 3: Any or a combination of the following: Contention-based and contention-free RACH transmission · Scheduling Request (SR) Configured grant PUSCH From a carrier / cell perspective, the following options are available:

[0074] Option 1: PScell ​​(Primary Secondary Cell) only Option 2: PScell ​​and Scell (4) Actions and Effects According to the above-described embodiment, the following advantageous effects can be obtained. Specifically, according to the UE 200, even in an omission state in which monitoring of the PDCCH is omitted, specifically, in a PDCCH skipping state, if a predetermined condition is met, monitoring of the PDCCH is executed (resumed). Therefore, even in a state in which PDCCH skipping is configured for the UE 200 and monitoring of the PDCCH is not performed, the PDCCH can be monitored as necessary. This can prevent communication delays.

[0075] In this embodiment, when the UE 200 performs uplink transmission (such as PUCCH transmission) or a random access procedure, the UE 200 can monitor the PDCCH. Therefore, in the main cases where the PDCCH needs to be monitored, the UE 200 can resume monitoring the PDCCH, and can reliably avoid communication delays.

[0076] In this embodiment, in the PDCCH skipping state, the UE 200 can execute, that is, resume, monitoring of the PDCCH by transitioning to a BWP different from the BWP used by the UE 200. Therefore, it is possible to resume monitoring of the PDCCH even in the PDCCH skipping state by utilizing existing operations while avoiding the need to prescribe new operations in the UE 200 for resuming monitoring of the PDCCH.

[0077] In this embodiment, the UE 200 resumes monitoring of the PDCCH in the PDCCH skipping state by notification from the medium access control layer (MAC) to the physical layer (PHY). Therefore, it is possible to resume monitoring of the PDCCH even in the PDCCH skipping state while utilizing processing between layers inside the UE 200.

[0078] (5) Other embodiments The present invention has been described above with reference to the embodiments. However, the present invention is not limited to these embodiments, and it will be obvious to those skilled in the art that various modifications and improvements are possible.

[0079] For example, in the above-described embodiment, the description was based on a function called PDCCH skipping (tentative name), but the above-described operations may be similarly applied to any function or case in which monitoring of the PDCCH is omitted (stopped).

[0080] Furthermore, in the above-described embodiment, the PDCCH has been described as an example, but the above-described operations may be similarly applied to functions or cases in which reception (monitoring) of other downlink (DL) signal channels (e.g., reference signal (RS), synchronization signal (SS) or PDSCH) other than the PDCCH is abbreviated (stopped).

[0081] Moreover, the block diagram (FIG. 2) used in the description of the above-mentioned embodiment shows functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (for example, by using wires, wirelessly, etc.). The functional block may be realized by combining the one device or the multiple devices with software.

[0082] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission is called a transmitting unit or a transmitter. As described above, there is no particular limitation on the method of realization of any of these.

[0083] Furthermore, the above-mentioned UE 200 may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 6 is a diagram showing an example of a hardware configuration of the UE 200. As shown in Fig. 6, the UE 200 may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0084] In the following description, the term "apparatus" may be interpreted as a circuit, a device, a unit, etc. The hardware configuration of the apparatus may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0085] Each functional block of the UE 200 (see FIG. 2) is realized by any hardware element of the computer device, or a combination of the hardware elements.

[0086] In addition, each function in UE200 is realized by loading a specific software (program) onto hardware such as processor 1001, memory 1002, etc., so that processor 1001 performs calculations, controls communication by communication device 1004, and controls at least one of reading and writing of data in memory 1002 and storage 1003.

[0087] The processor 1001 controls the entire computer by running, for example, an operating system, and may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control unit, an arithmetic unit, a register, and the like.

[0088] Furthermore, the processor 1001 reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the programs, programs that cause a computer to execute at least a part of the operations described in the above-mentioned embodiments are used. Furthermore, the above-mentioned various processes may be executed by one processor 1001, or may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0089] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically Erasable Programmable ROM (EEPROM), a Random Access Memory (RAM), etc. The memory 1002 may also be called a register, a cache, a main memory (primary storage device), etc. The memory 1002 can store a program (program code), a software module, etc., capable of executing a method according to an embodiment of the present disclosure.

[0090] Storage 1003 is a computer-readable recording medium, and may be composed of at least one of, for example, an optical disk such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like. Storage 1003 may be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, a database, a server, or other suitable medium including at least one of memory 1002 and storage 1003.

[0091] The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, or a communication module.

[0092] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like to realize, for example, at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0093] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0094] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0095] Furthermore, the device may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0096] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination of these. Furthermore, the RRC signaling may be called an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0097] Each aspect / embodiment described in the present disclosure may be applied to at least one of a system using Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other suitable systems, and next-generation systems extended based on these. In addition, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A and 5G, etc.) may be applied.

[0098] The order of the steps, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0099] In the present disclosure, a specific operation performed by a base station may be performed by its upper node in some cases. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal may be performed by at least one of the base station and other network nodes other than the base station (e.g., MME or S-GW, etc., but are not limited to these). Although the above example illustrates a case in which there is one other network node other than the base station, it may also be a combination of multiple other network nodes (e.g., MME and S-GW).

[0100] Information, signals (information, etc.) may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), and may be input and output via multiple network nodes.

[0101] The input / output information may be stored in a specific location (e.g., memory) or may be managed using a management table. The input / output information may be overwritten, updated, or appended. The output information may be deleted. The input information may be transmitted to another device.

[0102] The determination may be based on a value represented by a single bit (0 or 1), a Boolean (true or false) value, or a numerical comparison (e.g., comparison with a predetermined value).

[0103] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to execution. In addition, notification of specific information (e.g., notification that "X is the case") is not limited to being done explicitly, but may be done implicitly (e.g., not notifying the specific information).

[0104] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0105] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired and / or wireless technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0106] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0107] In addition, the terms described in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Also, a signal may be a message. Also, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0108] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0109] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by an index.

[0110] The names used for the above-mentioned parameters are not limiting in any way. Furthermore, the formulas using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0111] In this disclosure, terms such as "base station (BS)", "radio base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0112] A base station can accommodate one or more (e.g., three) cells (also called sectors). When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0113] The term "cell" or "sector" refers to part or all of the coverage area of ​​a base station and / or a base station subsystem that provides communication services within that coverage.

[0114] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0115] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0116] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0117] Furthermore, a base station in the present disclosure may be read as a mobile station (user terminal, the same applies below). For example, each aspect / embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a mobile station is replaced with communication between multiple mobile stations (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the mobile station may be configured to have the functions of a base station. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0118] Similarly, a mobile station in the present disclosure may be interpreted as a base station, in which case the base station may have the functions of a mobile station. A radio frame may be composed of one or more frames in the time domain, where each of the one or more frames in the time domain may be referred to as a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0119] Numerology may be a communication parameter that applies to the transmission and / or reception of a signal or channel, and may indicate, for example, at least one of a SubCarrier Spacing (SCS), a bandwidth, a symbol length, a Cyclic Prefix length, a Transmission Time Interval (TTI), a number of symbols per TTI, a radio frame structure, a particular filtering operation that the transceiver performs in the frequency domain, a particular windowing operation that the transceiver performs in the time domain, etc.

[0120] A slot may consist of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) A slot may be a numerology-based unit of time.

[0121] A slot may include multiple minislots. Each minislot may be composed of one or more symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0122] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. The radio frame, the subframe, the slot, the minislot, and the symbol may each be referred to by a different name.

[0123] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0124] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0125] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0126] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0127] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, etc.

[0128] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0129] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0130] In addition, the time domain of the RB may include one or more symbols and may be one slot, one minislot, one subframe, or one TTI in length. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0131] One or more RBs may be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0132] 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.

[0133] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0134] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0135] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell", "carrier", etc. in this disclosure may be replaced with "BWP".

[0136] The above-mentioned structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0137] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables, and printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0138] The reference signal may also be abbreviated as Reference Signal (RS), and may be called a pilot depending on the applicable standard.

[0139] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0140] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0141] Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed therein or that the first element must precede the second element in some way.

[0142] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term "comprising." Further, as used in this disclosure, the term "or" is not intended to be an exclusive or.

[0143] In this disclosure, where articles have been added due to translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0144] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), and the like. In addition, "judgment" and "decision" can include considering resolving, selecting, choosing, establishing, comparing, etc., to be a "judgment" or "decision." In other words, "judgment" and "decision" can include considering some action to be a "judgment" or "decision." In addition, "judgment" can be interpreted as "assuming," "expecting," "considering," etc.

[0145] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0146] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. [Explanation of symbols]

[0147] 10. Wireless communication systems 20 NG-RAN 100 gNB 200UE 210 Radio transmitter 220 Radio receiving unit 230 L1 Processing Unit 240 MAC Processing Unit 250 Control section 1001 Processor 1002 Memory 1003 Storage 1004 Communication equipment 1005 Input Device 1006 Output device 1007 Bus

Claims

1. a receiving unit for receiving a downlink control channel; A control unit for controlling monitoring of the downlink control channel; Equipped with The control unit resumes monitoring the downlink control channel when transmitting a scheduling request via an uplink control channel after an omission state in which monitoring of the downlink control channel is omission is set; The terminal restarts monitoring the downlink control channel by restarting monitoring the downlink control channel in another BWP (Band Width Part).

2. receiving a downlink control channel; omitting monitoring of the downlink control channel; after the omission state of monitoring the downlink control channel is set, when a scheduling request is transmitted via an uplink control channel, resuming monitoring of the downlink control channel; Including, A wireless communication method in a terminal, in which the resumption of monitoring of the downlink control channel is performed by resuming monitoring of the downlink control channel in another BWP (Band Width Part).

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