Terminal and base station

Abstract

To provide a terminal and a base station that reduce the amount of power consumed by a terminal during paging monitoring.SOLUTION: In a wireless communication system, a terminal includes a control unit that determines, on the basis of a notification signal transmitted from a base station, whether a reference signal can be used to monitor paging at a paging occasion, and a receiving unit that receives the reference signal when the reference signal can be used.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to terminals and base stations in wireless communication systems. [Background technology]

[0002] The 3GPP (3rd Generation Partnership Project) is currently studying a wireless communication system called 5G or NR (New Radio) (hereinafter referred to as "NR") in order to achieve even larger system capacity, even faster data transmission speeds, and even lower latency in wireless sections. NR is studying various wireless technologies and network architectures to meet the requirements of achieving a throughput of 10 Gbps or more while keeping wireless section latency to 1 ms or less.

[0003] In NR, as in LTE, paging is performed to call a terminal in standby mode when an incoming call is received. In NR, a terminal in RRC_IDLE state or RRC_INACTIVE state performs discontinuous reception operation for power saving in order to monitor paging DCI (Non-Patent Document 1). In discontinuous reception operation, a period in which a terminal wakes up from a sleep state and performs paging monitoring is called a PO (paging occasion). Hereinafter, a terminal in RRC_IDLE state or RRC_INACTIVE state may be referred to as an idle / inactive mode UE. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TS 38.304 V16.1.0(2020-07) Summary of the Invention [Problem to be solved by the invention]

[0005] When an idle / inactive mode UE in NR performs paging monitoring in a paging occasion (PO), it needs to perform reception processing of multiple synchronization signal blocks (SSBs) in advance to perform time / frequency tracking, auto gain control (AGC), etc.

[0006] However, compared to CRS (Cell-specific Reference Signal) in LTE, SSB is transmitted at a relatively long interval, so the terminal must wake up earlier than the timing of PO reception to process SSB, which makes it impossible to maintain a long sleep period, leading to increased terminal power consumption.

[0007] In addition to SSB, it is also possible to use a Tracking Reference Signal (TRS) or a Channel State Information Reference Signal (CSI-RS) for paging monitoring. Hereinafter, TRS or CSI-RS may be referred to as TRS / CSI-RS.

[0008] However, since the terminal (idle / inactive mode UE) does not know whether TRS or CSI-RS is being transmitted from the base station, it must wake up early, just as it would when using only SSB. This makes it impossible to maintain a long sleep period, which leads to increased terminal power consumption.

[0009] The present invention has been made in view of the above points, and has an object to provide a technique that makes it possible to reduce the amount of power consumed by a terminal when monitoring paging. [Means for solving the problem]

[0010] According to the disclosed technology, a control unit that determines whether a reference signal can be used to monitor paging at a paging occasion based on a notification signal transmitted from a base station; a receiving unit that receives the reference signal when the reference signal is available, The control unit determines whether one or more reference signals at a specific resource location are available based on at least one of a resource location of the notification signal and sequence information of the notification signal. A terminal is provided. [Effects of the Invention]

[0011] The disclosed technology provides a technology that enables reduction in the amount of power consumption of a terminal during paging monitoring. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. [Figure 2] 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. [Figure 3] FIG. 10 is a diagram illustrating an example of operation for paging monitoring. [Figure 4] FIG. 10 is a diagram illustrating an example of operation for paging monitoring. [Figure 5] FIG. 1 is a diagram illustrating an example of a basic operation. [Figure 6] FIG. 10 is a diagram illustrating an example of operation for paging monitoring. [Figure 7] FIG. 10 is a diagram illustrating an example of operation for paging monitoring. [Figure 8] FIG. 1 is a diagram for explaining a first embodiment. [Figure 9] FIG. 1 is a diagram for explaining a first embodiment. [Figure 10] FIG. 1 is a diagram for explaining a first embodiment. [Figure 11]FIG. 1 is a diagram for explaining a first embodiment. [Figure 12] FIG. 1 is a diagram for explaining a first embodiment. [Figure 13] FIG. 1 is a diagram for explaining a first embodiment. [Figure 14] FIG. 1 is a diagram for explaining a first embodiment. [Figure 15] FIG. 1 is a diagram for explaining a first embodiment. [Figure 16] FIG. 10 is a diagram for explaining a second embodiment. [Figure 17] FIG. 10 is a diagram for explaining a second embodiment. [Figure 18] FIG. 10 is a diagram for explaining a third embodiment. [Figure 19] FIG. 10 is a diagram for explaining a third embodiment. [Figure 20] 2 is a diagram illustrating an example of a functional configuration of a base station 10 according to an embodiment of the present invention. [Figure 21] FIG. 2 is a diagram illustrating an example of a functional configuration of a terminal 20 according to the embodiment of the present invention. [Figure 22] 2 is a diagram illustrating an example of a hardware configuration of a base station 10 or a terminal 20 according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0014] In operation of the wireless communication system according to the embodiment of the present invention, existing technology is used as appropriate, such as existing NR, but is not limited to existing NR.

[0015] Furthermore, this specification uses terms used in existing NR or LTE specifications, such as PUSCH, PDCCH, RRC, MAC, and DCI, but the channel names, protocol names, signal names, function names, etc. used in this specification may be called by other names.

[0016] (System Configuration) Fig. 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. As shown in Fig. 1, the wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20. Although Fig. 1 shows one base station 10 and one terminal 20, this is an example, and there may be a plurality of each.

[0017] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of a wireless signal are defined in the time domain and the frequency domain, and the time domain may be defined by the number of OFDM symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. Furthermore, a TTI (Transmission Time Interval) in the time domain may be a slot, or a TTI may be a subframe.

[0018] The base station 10 transmits a synchronization signal, system information, and the like to the terminal 20. The synchronization signal is, for example, NR-PSS and NR-SSS. The system information is transmitted, for example, on the NR-PBCH or PDSCH, and is also called broadcast information. As shown in FIG. 1 , the base station 10 transmits control signals or data to the terminal 20 on the DL (Downlink) and receives control signals or data from the terminal 20 on the UL (Uplink). Note that, here, what is transmitted on a control channel such as the PUCCH or PDCCH is called a control signal, and what is transmitted on a shared channel such as the PUSCH or PDSCH is called data, but these names are merely examples.

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

[0020] Fig. 2 shows an example of the configuration of a wireless communication system when DC (Dual connectivity) is implemented. As shown in Fig. 2, a base station 10A serving as an MN (Master Node) and a base station 10B serving as an SN (Secondary Node) are provided. The base station 10A and the base station 10B are each connected to a core network. The terminal 20 can communicate with both the base station 10A and the base station 10B.

[0021] A cell group provided by the base station 10A, which is an MN, is called an MCG (Master Cell Group), and a cell group provided by the base station 10B, which is an SN, is called an SCG (Secondary Cell Group).

[0022] The processing operations in this embodiment may be executed in the system configuration shown in FIG. 1, in the system configuration shown in FIG. 2, or in any other system configuration.

[0023] (Basic operation example) In NR, as in LTE, paging is performed to call a terminal in standby mode when an incoming call is received. In NR, a terminal 20 (idle / inactive mode UE) performs discontinuous reception operation for power saving in order to monitor paging DCI (Non-Patent Document 1). In discontinuous reception operation, a period during which the terminal 20 wakes up from a sleep state and performs paging monitoring is called a PO (paging occasion).

[0024] The terminal 20 monitors, for example, one PO per DRX cycle. A PO consists of, for example, multiple slots.

[0025] As described above, when an idle / inactive mode UE in NR performs paging monitoring in a paging occasion (PO), it needs to receive multiple synchronization signal blocks (SSBs) in order to perform time / frequency tracking, auto gain control (AGC), etc. in advance. The number of SSBs received in advance varies depending on the reception quality.

[0026] An example of the operation of terminal 20 when SSB reception is performed before PO will be described with reference to Fig. 3. The upper part of Fig. 3 shows the SSB reception operation, and the lower part shows the power consumption of terminal 20.

[0027] Figure 3 shows an example in which the SSB period is 20 ms and three SSBs are received before PO. Terminal 20 sleeps for a long time before the SSB indicated by A, and wakes up at the SSB indicated by A. After receiving the SSB indicated by A, it goes to sleep, but because it is only a short sleep, some circuits must remain active, consuming power. SSB reception is similarly performed at times B and C, and paging monitoring is performed at PO.

[0028] (About the assignment) However, because SSB is transmitted at a relatively long interval, the terminal 20 must wake up early relative to the timing of PO reception in order to process the SSB. This means that the terminal cannot maintain a long sleep period, which increases the terminal's power consumption. In the example of Figure 3, the long sleep period must end 60 ms before the PO.

[0029] As described above, for paging monitoring, it is possible to use TRS / CSI-RS, which is a reference signal transmitted at a shorter period than SSB, in addition to or instead of SSB. That is, it is possible to perform time / frequency tracking, AGC (auto gain control), etc. by using TRS / CSI-RS. By terminal 20 using TRS / CSI-RS for paging monitoring, there is no additional resource overhead, etc., and it is possible to reduce power consumption.

[0030] However, TRS / CSI-RS is a reference signal used by terminal 20 (connected mode UE) in an RRC connected state, and is not necessarily transmitted in the cell (and beam) in which terminal 20 is located. For example, if there is no connected mode UE connected in the beam in the cell, base station 10 may determine that there is no need to transmit TRS / CSI-RS and perform control not to transmit TRS / CSI-RS.

[0031] If it is unclear whether TRS / CSI-RS is being transmitted, terminal 20 cannot determine in advance when it is sufficient to wake up. Therefore, as in the case of using SSB shown in Fig. 3, terminal 20 needs to wake up a longer time before PO, which increases power consumption.

[0032] (Example of operation when using TRS / CSI-RS) An example of operation for solving the above problem will be described below. In this embodiment, a reference signal transmitted from base station 10 (network) notifies the availability (validity) of another reference signal to be transmitted after the reference signal. Terminal 20 can determine whether to expect another reference signal to be transmitted based on this availability information.

[0033] In this embodiment, TRS / CSI-RS is used as the reference signal used for notifying availability and for paging monitoring, but this is just an example, and reference signals other than TRS / CSI-RS may also be used. For example, (DM-RS: Demodulation reference signal), (PT-RS: Phase-tracking reference signal), (PRS: Positioning reference signal), etc. may also be used.

[0034] Furthermore, the reference signal used for notifying availability and the reference signal used for paging monitoring may be the same reference signal (e.g., the same TRS) or different reference signals (e.g., one is TRS and the other is CSI-RS). Furthermore, both the reference signal used for notifying availability and the reference signal used for paging monitoring may be signals other than reference signals.

[0035] Hereinafter, the reference signal used for notifying availability will also be referred to as the "availability notification reference signal." Also, the reference signal for paging monitoring will also be referred to as the "paging monitoring reference signal." The "availability notification reference signal" may also be referred to as the "notification signal."

[0036] Fig. 4 shows an example of operation when it is assumed that terminal 20 (idle / inactive mode UE) uses a reference signal for paging monitoring in response to the availability notification signal. Fig. 4 shows an example in which TRS is used as a reference signal for paging monitoring, but CSI-RS may be used instead of TRS. The upper part of Fig. 4 shows the reception operation of TRS, etc., and the lower part shows the power consumption of terminal 20.

[0037] 4 will be transmitted by the availability notification signal received from the base station 10. The availability notification signal may also notify the timing, time-frequency resources, etc. of the TRS shown in D and E.

[0038] Terminal 20 sleeps for a long time until the SSB timing indicated by C, and wakes up at the SSB timing indicated by C. In the case of Figure 4, terminal 20 knows that it can receive TRS at timings D and C, so it does not wake up at the SSB timing indicated by A as in the case of Figure 3.

[0039] Terminal 20 receives TRS at timings D and E and performs paging monitoring at PO. Note that in the example of Fig. 4, terminal 20 receives SSB and TRS / CSI-RS before PO after a long sleep, but terminal 20 may receive only TRS / CSI-RS before PO after a long sleep.

[0040] (Basic operation example) An example of basic operation will be described with reference to Fig. 5. In S101, the terminal 20 receives an availability notification reference signal from the base station 10. Here, it is assumed that the terminal 20 has received the availability notification reference signal and that a paging monitoring reference signal is transmitted from the base station 10 and is available for use.

[0041] Terminal 20 receives the reference signal for paging monitoring in S102, performs monitoring in PO, and receives PDCCH in S103. The operations from S101 onwards correspond to those shown in FIG.

[0042] The resources for the availability notification reference signal and the paging monitoring reference signal may be set in advance by the base station 10 to the terminal 20, or may be defined in a specification or the like.

[0043] (Example of availability notification reference signal) In this embodiment, the availability notification reference signal is not limited to a specific one, but for example, a reference signal (e.g., TRS, CSI-RS) transmitted as a paging early indication (PEI) may be used as the availability notification reference signal. In other words, the reference signal used as a PEI may notify the availability of a reference signal (e.g., TRS, CSI-RS) for paging monitoring that may be transmitted thereafter.

[0044] In the example shown in Fig. 6, TRSs shown by B and C are notified by the PEI (TRS) shown by A. Note that the positions of the TRSs shown in Fig. 6 are just an example.

[0045] At the same time, information indicating whether or not it is necessary to monitor a paging occasion (PO) is notified to the terminal 20 by the PEI. Therefore, if the terminal 20 determines that it is not necessary to monitor a PO by the PEI, it may not perform reception processing of a paging monitoring reference signal regardless of the availability information.

[0046] Furthermore, when it is found from the PEI that it is necessary to monitor the PO, the terminal 20 may perform reception processing of the reference signal for paging monitoring based on the availability information.

[0047] As an example other than PEI, for example, the reference signal for paging monitoring, which is used to perform synchronization etc. necessary for PO monitoring, and for which time resources are set at the earliest timing may be used as the availability notification reference signal.

[0048] An example is shown in Fig. 7. In Fig. 7, the TRSs indicated by A and B are both paging monitoring reference signals. Of these, the TRS indicated by A, which has the earliest time resource set, is used as the availability notification reference signal. For example, based on the availability notification information in the TRS indicated by A, terminal 20 determines the availability of a paging monitoring reference signal (TRS indicated by B) that may be transmitted subsequently.

[0049] Specific operational examples will be described below as Examples 1 to 3. Examples 1 to 3 can be implemented in any combination.

[0050] Example 1 First, a description will be given of Example 1. Example 1 is an example relating to a method for notifying the availability of a reference signal for paging monitoring by using an availability notification reference signal.

[0051] In the first embodiment, availability of the paging monitoring reference signal is notified by associating one or a combination of two or all of the following: whether or not an availability notification reference signal is detected, the resource location of the availability notification reference signal, the sequence of the availability notification reference signal, etc. with whether or not the paging monitoring reference signal is available (available) or not (not available). Detailed examples will be described below as embodiments 1-1, 1-2, and 1-3.

[0052] <Example 1-1> Example 1-1 is an example in which whether or not an availability notification reference signal is detected is associated with whether or not a paging monitoring reference signal is available.

[0053] For example, the detection of an availability notification reference signal is associated with the availability of a subsequent reference signal for paging monitoring, and the non-detection of an availability notification reference signal is associated with the non-availability of a subsequent reference signal for paging monitoring.

[0054] For example, as shown in Figure 8, when terminal 20 detects TRS-A as an availability notification reference signal transmitted from base station 10, terminal 20 determines that TRS-B and TRS-C are available as reference signals for paging monitoring, and performs reception processing for TRS-B and TRS-C, respectively.

[0055] Also, as shown in Figure 9, if terminal 20 cannot detect TRS-A as an availability notification reference signal transmitted from base station 10, terminal 20 determines that TRS-B and TRS-C as reference signals for paging monitoring are unavailable, and does not perform reception processing for either TRS-B or TRS-C.

[0056] <Example 1-2> Example 1-2 is an example of associating the resource position of an availability notification reference signal with the availability of a reference signal for paging monitoring. The resource position of the availability notification reference signal may be the position of a time resource, the position of a frequency resource, or the position of a time-frequency resource. Hereinafter, "resource position" means the position of a time resource, the position of a frequency resource, or the position of a time-frequency resource.

[0057] For example, resource position 1 of the availability notification reference signal is associated with availability of the reference signal for paging monitoring, and resource position 2 of the availability notification reference signal is associated with unavailability of the reference signal for paging monitoring. Information on this correspondence may be defined in specifications or the like, or may be notified from base station 10 to terminal 20 by RRC signaling, MAC CE, DCI, or the like.

[0058] An example will be described with reference to the drawings. The examples shown in Figures 10 and 11 are examples using the time resource position of the availability notification reference signal.

[0059] In the examples of Figures 10 and 11, of the availability notification reference signals TRS-A and TRS-B, the time resource position of TRS-A, which is earlier in time, corresponds to the unavailability of the reference signal for paging monitoring, and the time resource position of TRS-B, which is later in time, corresponds to the availability of the reference signal for paging monitoring.

[0060] 10, terminal 20 detects TRS-B, determines that paging monitoring reference signals TRS-C and TRS-D are available, and performs reception processing for TRS-C and TRS-D. In this case, base station 10 determines that it will transmit TRS-C and TRS-D, and therefore transmits TRS-B of TRS-A and TRS-B.

[0061] 11, terminal 20 detects TRS-A, determines that paging monitoring reference signals TRS-C and TRS-D are unavailable, and does not perform reception processing for TRS-C and TRS-D. In this case, base station 10 determines not to transmit TRS-C and TRS-D, and therefore transmits TRS-A out of TRS-A and TRS-B.

[0062] The examples shown in FIGS. 12 and 13 are examples in which the frequency resource position of the availability notification reference signal is used.

[0063] In the examples of Figures 12 and 13, of the availability notification reference signals TRS-A and TRS-B, the frequency resource location of TRS-A corresponds to the unavailability of the reference signal for paging monitoring, and the frequency resource location of TRS-B corresponds to the availability of the reference signal for paging monitoring.

[0064] 12, terminal 20 detects TRS-B, determines that paging monitoring reference signals TRS-C and TRS-D are available, and performs reception processing for TRS-C and TRS-D. In this case, base station 10 determines that it will transmit TRS-C and TRS-D, and therefore transmits TRS-B of TRS-A and TRS-B.

[0065] 13, terminal 20 detects TRS-A, determines that paging monitoring reference signals TRS-C and TRS-D are unavailable, and does not perform reception processing for TRS-C and TRS-D. In this case, base station 10 determines not to transmit TRS-C and TRS-D, and therefore transmits TRS-A out of TRS-A and TRS-B.

[0066] <Examples 1-3> Example 1-3 is an example in which the sequence / encoding / Scrambling / CDM of the availability notification reference signal is associated with the availability of the paging monitoring reference signal.

[0067] "Sequence / Encoding / Scrambling / CDM" refers to any one, any two, any three, or all of the following: the sequence of an availability notification reference signal, the encoding method of an availability notification reference signal, the scrambling method of an availability notification reference signal, and the CDM (Code division Multiplexing) method of an availability notification reference signal. Hereinafter, "sequence / Encoding / Scrambling / CDM" will be referred to as "sequence information."

[0068] For example, if the sequence of a reference signal used as an availability notification reference signal is identified by a sequence ID, sequence ID=N corresponds to availability of the reference signal for paging monitoring, and sequence ID=M corresponds to unavailability of the reference signal for paging monitoring. Here, N and M may each be a single number, multiple numbers, or a range of numbers.

[0069] Information on the correspondence between "sequence / encoding / Scrambling / CDM" and whether or not reference signals for paging monitoring can be used may be defined in specifications, etc., or may be notified from base station 10 to terminal 20 via RRC signaling, MAC CE, DCI, etc.

[0070] An example will be described with reference to the drawings. In the examples shown in Figures 14 and 15, the sequence of the availability notification reference signal is used for association.

[0071] In the examples of Figures 14 and 15, the availability notification reference signal with sequence ID = 0 is associated with the availability of the reference signal for paging monitoring, and the availability notification reference signal with sequence ID = 1 is associated with the unavailability of the reference signal for paging monitoring.

[0072] 14, terminal 20 detects TRS-A with sequence ID=0, and therefore determines that TRS-C and TRS-D, which are reference signals for paging monitoring, are available, and performs reception processing for TRS-C and TRS-D. In this case, base station 10 determines that it will transmit TRS-C and TRS-D, and therefore transmits TRS-A out of TRS-A and TRS-B.

[0073] 15, terminal 20 detects TRS-B with sequence ID=1, and therefore determines that paging monitoring reference signals TRS-C and TRS-D are unavailable, and does not perform reception processing for TRS-C and TRS-D. In this case, base station 10 determines not to transmit TRS-C and TRS-D, and therefore transmits TRS-B of TRS-A and TRS-B.

[0074] <About default behavior> In Example 1, the default behavior of terminal 20 when terminal 20 is unable to detect either an availability notification reference signal corresponding to availability or an availability notification reference signal corresponding to unavailability may be defined in specifications, etc., or may be notified from base station 10 to terminal 20 by RRC signaling, MAC CE, DCI, etc.

[0075] The default operation is, for example, an operation assuming that the reference signal for paging monitoring is unavailable. The default operation may also be an operation assuming that the reference signal for paging monitoring is available, that is, an operation performing reception processing for the reference signal for paging monitoring.

[0076] According to the first embodiment, the terminal 20 can determine whether or not the reference signal for paging monitoring is available based on whether or not an availability notification reference signal has been received, thereby realizing a reduction in power consumption related to PO monitoring.

[0077] Example 2 Next, a description will be given of Example 2. Example 2 may be implemented in combination with Example 1, or may be implemented independently of Example 1.

[0078] In the second embodiment, the availability notification reference signal notifies whether one or more specific reference signals for paging monitoring are available. For example, the availability notification reference signal may notify how many reference signals for paging monitoring are available at which resource positions.

[0079] The correspondence between the information of the availability notification reference signal (e.g., resource location, sequence information) and any one or a combination of the number of reference signals for paging monitoring for which availability is notified, resource location, sequence information, etc. may be specified in specifications, etc., or may be notified from the base station 10 to the terminal 20 by RRC signaling, MAC CE, DCI, etc.

[0080] Based on the correspondence, the terminal 20 can determine, for example, how many paging monitoring reference signals are available at which resource positions, from the information of the detected availability notification reference signals.

[0081] More specifically, for example, the resource location or sequence information (or both the resource location and sequence information) of the availability notification reference signal may notify the availability of one or more paging monitoring reference signals and the resource location of one or more paging monitoring reference signals that are the subject of that availability.

[0082] An example will be described with reference to Figures 16 and 17. In Figures 16 and 17, a resource indicated by A (referred to as resource A) is associated with the unavailability of a reference signal for paging monitoring, and a resource indicated by B (referred to as resource B) is associated with the availability of a reference signal for paging monitoring.

[0083] Furthermore, as availability notification reference signals, TRS-A1 and TRS-A2 are transmitted using resources within resource A, and TRS-B1 and TRS-B2 are transmitted using resources within resource B.

[0084] Furthermore, of TRS-B1 and TRS-B2, which are associated with the availability of reference signals for paging monitoring, TRS-B1 is associated with TRS-C and D of the paging monitoring reference signals TRS-C to TRS-F, and TRS-B2 is associated with TRS-E and TRS-F.

[0085] Furthermore, of TRS-A1 and TRS-A2, which are associated with the unavailability of reference signals for paging monitoring, for example, TRS-A1 is associated with TRS-C and D of the reference signals for paging monitoring TRS-C to TRS-F, and TRS-A2 is associated with TRS-E and F.

[0086] 16, it is assumed that the base station 10 determines that TRS-E and F are to be transmitted as paging monitoring reference signals, and transmits TRS-B2 as an availability notification reference signal. At this time, when the terminal 20 detects TRS-B2, it determines that TRS-E and F are being transmitted, and performs reception processing for TRS-E and F.

[0087] 17, the base station 10 determines that it will transmit TRS-C and D as reference signals for paging monitoring, and therefore assumes that it is transmitting TRS-B1 as an availability notification reference signal. At this time, when the terminal 20 detects TRS-B1, it determines that TRS-C and D are being transmitted, and performs reception processing for TRS-C and D.

[0088] Also, for example, if an availability notification reference signal cannot be detected in a resource for which an unavailability notification has been sent, it may be determined that a paging monitoring reference signal corresponding to that availability notification reference signal has been sent.

[0089] For example, in the setting examples in Figures 16 and 17, if terminal 20 detects TRS-A1 but does not detect any of TRS-A2, B1, or B2, it may determine that TRS-E and F corresponding to TRS-A2 are being transmitted and perform reception processing for TRS-E and F.

[0090] In the second embodiment, there may be a correspondence relationship of beam information (e.g., TCI state configuration) between the availability notification reference signal and the corresponding paging monitoring reference signal. Specifically, for example, the availability notification reference signal and the corresponding paging monitoring reference signal may have the same TCI state ID.

[0091] In the second embodiment, an availability notification reference signal and a corresponding paging monitoring reference signal may have a correspondence relationship of QCL (Quasi-CoLocation) related information. Specifically, for example, an availability notification reference signal and a corresponding paging monitoring reference signal may have the same QCL type. Also, for example, an availability notification reference signal and a corresponding paging monitoring reference signal may be in a QCL-colocated (quasi-colocated) relationship.

[0092] In the second embodiment, an availability notification reference signal and a corresponding paging monitoring reference signal may have a corresponding antenna port. Specifically, for example, an availability notification reference signal and a corresponding paging monitoring reference signal may have the same antenna port. Also, for example, an availability notification reference signal and a corresponding paging monitoring reference signal may have antenna ports that are related to each other.

[0093] An example of operation using the TCI state will be described with reference to Fig. 17. For example, assume that TCI state ID=1 is set for TRS-B1, and TCI state ID=1 is also set for TRS-C and TRS-D corresponding to TRS-B1.

[0094] At this time, the terminal 20 detects TRS-B2 with TCI state ID=1, and can perform reception processing of TRS-C and D, assuming that TCI state ID=1.

[0095] According to the second embodiment, the terminal 20 can determine the availability and resource location of the reference signal for paging monitoring based on the resource location of the availability notification reference signal, thereby realizing reduction in power consumption related to PO monitoring.

[0096] Example 3 Next, a description will be given of Example 3. Example 3 may be implemented in combination with either or both of Examples 1 and 2, or may be implemented independently of either Example 1 or 2.

[0097] In the third embodiment, a method of operation of the terminal 20 when the terminal 20 detects one or more availability notification reference signals among a plurality of availability notification reference signals will be described. This method of operation may be defined in specifications or the like, or may be notified from the base station 10 to the terminal 20 by RRC signaling, MAC CE, DCI, or the like.

[0098] For example, when multiple availability notification reference signals are set and terminal 20 detects multiple availability notification reference signals, terminal 20 may determine whether the corresponding subsequent paging monitoring reference signal is available for use based on the availability information for each of the detected availability notification reference signals.

[0099] Furthermore, when the terminal 20 detects multiple availability notification reference signals notifying the availability of paging monitoring reference signals, the terminal 20 may perform reception processing on one or more paging monitoring reference signals that are part of the multiple paging monitoring reference signals corresponding to the detected multiple availability notification reference signals. Which one or more paging monitoring reference signals among the multiple paging monitoring reference signals to perform reception processing on may be defined in specifications or the like, or may be notified from the base station 10 to the terminal 20 by RRC signaling, MAC CE, DCI, or the like.

[0100] An example will be described with reference to Fig. 18. The signal settings in Fig. 18 are the same as those in Fig. 16 and Fig. 17. That is, the resource indicated by A (referred to as resource A) is associated with the unavailability of the reference signal for paging monitoring, and the resource indicated by B (referred to as resource B) is associated with the availability of the reference signal for paging monitoring.

[0101] Also, as availability notification reference signals, TRS-A1 and TRS-A2 are set to be transmitted using resources within resource A, and TRS-B1 and TRS-B2 are set to be transmitted using resources within resource B. Furthermore, of TRS-B1 and TRS-B2 which are associated with the availability of paging monitoring reference signals, TRS-B1 is associated with TRS-C and D of TRS-C to TRS-F which are paging monitoring reference signals, and TRS-B2 is associated with TRS-E and TRS-F.

[0102] If terminal 20 detects both TRS-B1 and TRS-B2, for example, terminal 20 determines that TRS-C and D corresponding to TRS-B1 and TRS-E and F corresponding to TRS-B2 are available, and performs reception processing for these.

[0103] Also, for example, suppose there is a provision or setting that states that "when multiple availability notification reference signals indicating the availability of a paging monitoring reference signal are detected, the paging monitoring reference signal corresponding to the availability notification reference signal of only a specific resource (e.g., the first resource (or the last resource) in terms of time) is made available." In this case, in the case of Figure 18, terminal 20 uses only TRS-C and D or only TRS-E and F as paging monitoring reference signals in accordance with the provision or setting.

[0104] Furthermore, for example, when terminal 20 first detects one of the availability notification reference signals in a set, it may not need to attempt to detect subsequent availability notification reference signals in the set. In this case, terminal 20 determines whether the subsequent paging monitoring reference signal corresponding to the availability notification reference signal detected first is available based on the availability information of the first detected availability notification reference signal, and performs reception processing if the subsequent paging monitoring reference signal is available.

[0105] Furthermore, when terminal 20 detects any one of the availability notification reference signals in a set that is transmitted on a resource corresponding to the available resource, terminal 20 may not attempt to detect any subsequent availability notification reference signals in the set.

[0106] Furthermore, when terminal 20 detects any one of the availability notification reference signals in a set that is transmitted on a resource corresponding to unavailable resources, terminal 20 may not attempt to detect any subsequent availability notification reference signals in that set.

[0107] An example will be described with reference to Fig. 19. In the example of Fig. 19, it is assumed that a provision or setting is made such that "when terminal 20 detects any one of the availability notification reference signals in a certain set that is transmitted using a resource corresponding to available use, terminal 20 does not need to attempt to detect any subsequent availability notification reference signal in the set."

[0108] In this case, the set includes TRS-A1, A2, B1, and B2. As shown in Fig. 19, when terminal 20 detects TRS-B1, it determines that TRS-C and TRS-D corresponding to TRS-B1 are available without attempting to detect TRS-B2, and executes reception processing for TRS-C and TRS-D.

[0109] According to the third embodiment, for example, when one of a plurality of availability notification reference signals is received, it is possible to eliminate the need to attempt to receive subsequent availability notification reference signals, thereby enabling efficient reception processing.

[0110] (Device configuration) Next, a description will be given of an example of the functional configuration of the base station 10 and the terminal 20 that execute the processes and operations described above. The base station 10 and the terminal 20 include functions for implementing the above-mentioned embodiments 1 to 3. However, the base station 10 and the terminal 20 may each include only the functions of any one of embodiments 1 to 3.

[0111] <Base station 10> Fig. 20 is a diagram showing an example of the functional configuration of the base station 10. As shown in Fig. 20, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Fig. 20 is merely an example. The names of the functional divisions and functional units may be any as long as they can perform the operations related to the embodiment of the present invention. The transmitting unit 110 and the receiving unit 120 may be called a communication unit.

[0112] The transmitter 110 has a function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The receiver 120 has a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information of a higher layer from the received signals. The transmitter 110 also has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL data, etc. to the terminal 20. The transmitter 110 also transmits notification signals, etc., described in the first to third embodiments, to the terminal 20.

[0113] The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 in a storage device, and reads out the information from the storage device as needed.

[0114] The control unit 140 performs, for example, resource allocation and overall control of the base station 10. Note that the functional unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and the functional unit related to signal reception in the control unit 140 may be included in the receiving unit 120. Furthermore, the transmitting unit 110 and the receiving unit 120 may be called a transmitter and a receiver, respectively.

[0115] <Terminal 20> Fig. 21 is a diagram showing an example of the functional configuration of the terminal 20. As shown in Fig. 21, the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Fig. 21 is merely an example. The names of the functional divisions and functional units may be any as long as they can execute the operations related to the embodiment of the present invention. The transmitting unit 210 and the receiving unit 220 may be called a communication unit.

[0116] The transmitter 210 generates a transmission signal from transmission data and transmits the transmission signal wirelessly. The receiver 220 receives various signals wirelessly and acquires higher layer signals from the received physical layer signals.

[0117] The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220 in a storage device, and reads it out from the storage device as needed. The setting unit 230 also stores setting information that is set in advance. The setting information includes, for example, information on the correspondence relationships described in the first to third embodiments.

[0118] The control unit 240 controls paging monitoring in the PO based on the notification signal received from the base station 10. For example, the control unit 240 determines whether or not to perform paging monitoring in the PO using TRS / CSI-RS. Note that the functional unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and the functional unit related to signal reception in the control unit 240 may be included in the receiving unit 220. Furthermore, the transmitting unit 210 and the receiving unit 220 may be called a transmitter and a receiver, respectively.

[0119] This embodiment provides at least the terminal, base station, and receiving method described in the following sections, for example. (Section 1) a control unit that determines whether a reference signal can be used to monitor paging at a paging occasion based on a notification signal transmitted from a base station; a receiver for receiving the reference signal when the reference signal is available; A terminal comprising: (Section 2) The control unit determines whether the reference signal can be used based on at least one of whether the notification signal has been detected, a resource location of the notification signal, and sequence information of the notification signal. 1. The terminal described in paragraph 1. (Section 3) The control unit determines whether one or more reference signals at a specific resource location are available based on at least one of a resource location of the notification signal and sequence information of the notification signal. 2. A terminal according to claim 1 or 2. (Section 4) When the receiving unit receives a notification signal from among the plurality of notification signals, the receiving unit does not attempt to detect notification signals subsequent to the notification signal. A terminal according to any one of paragraphs 1 to 3. (Section 5) a control unit that determines whether to transmit a reference signal; a transmitter configured to transmit a notification signal indicating whether the reference signal is available for monitoring paging at a paging occasion to a terminal; A base station comprising: (Section 6) determining whether a reference signal is available for monitoring paging at a paging occasion based on a notification signal transmitted from the base station; receiving said reference signal when said reference signal is available; A receiving method executed by a terminal, comprising:

[0120] Any of the first to sixth clauses makes it possible to reduce the amount of power consumed by the terminal during paging monitoring. In particular, the second clause enables the terminal 20 to determine whether or not a reference signal is available based on whether or not a notification signal has been received. Furthermore, the third clause enables the terminal 20 to determine whether or not a reference signal is available and the resource location based on the resource location of the notification signal. Furthermore, the fourth clause enables efficient reception processing.

[0121] (Hardware configuration) The block diagrams (FIGS. 20 and 21) used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining the single device or the multiple devices with software.

[0122] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocation, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0123] For example, the base station 10, the terminal 20, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 22 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The base station 10 and the terminal 20 described above may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0124] In the following description, the term "apparatus" can be read as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0125] Each function in the base station 10 and the terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001, the memory device 1002, etc., so that the processor 1001 performs calculations, controls communication by the communication device 1004, and controls at least one of reading and writing data in the memory device 1002 and the auxiliary memory device 1003.

[0126] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0127] Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes in accordance with the programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the base station 10 shown in FIG. 20 may be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 21 may be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. While the above-described various processes have been described as being executed by one processor 1001, they may also 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.

[0128] The storage device 1002 is a computer-readable recording medium and may be configured, for example, by at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The storage device 1002 may also be called a register, a cache, a main memory, etc. The storage device 1002 can store executable programs (program codes), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

[0129] The secondary storage device 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. The secondary storage device 1003 may also be referred to as an secondary storage device. The above-mentioned storage medium may be, for example, a database, a server, or other appropriate medium including at least one of the storage device 1002 and the secondary storage device 1003.

[0130] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, a transmission / reception antenna, an amplifier unit, a transmission / reception unit, a transmission path interface, etc. may be realized by the communication device 1004. The transmission / reception unit may be implemented as a transmission unit and a reception unit that are physically or logically separated.

[0131] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0132] Furthermore, each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0133] Furthermore, base station 10 and terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

[0134] (Supplementary explanation of the embodiment) Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention; two or more items may be combined as needed, and items described in one item may apply to items described in another item (unless inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries between physical components. The operations of multiple functional units may be performed by a single physical component, or the operations of a single functional unit may be performed by multiple physical components. The order of the processing steps described in the embodiments may be reversed as long as there is no contradiction. For convenience of processing description, the base station 10 and terminal 20 have been described using functional block diagrams. However, such devices may be implemented using hardware, software, or a combination thereof. The software operated by the processor of the base station 10 in accordance with an embodiment of the present invention and the software operated by the processor of the terminal 20 in accordance with an embodiment of the present invention may each 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 or any other suitable storage medium.

[0135] 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., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0136] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-Advanced (LTE-A), 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), or other appropriate systems, and next-generation systems extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.) may also be applied.

[0137] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order and are not limited to the particular order presented.

[0138] In this specification, a specific operation that is described as being performed by the base station 10 may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having the base station 10, it is clear that various operations performed for communication with the terminal 20 may be performed by at least one of the base station 10 and another network node other than the base station 10 (such as, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station 10, the other network node may be a combination of multiple other network nodes (such as an MME and an S-GW).

[0139] The information or signals described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0140] Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be sent to another device.

[0141] In the present disclosure, the determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0142] 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.

[0143] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0144] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0145] Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0146] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0147] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0148] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUSCH, PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0149] In this disclosure, terms such as "base station (BS)," "radio base station," "base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0150] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0151] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0152] 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, terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0153] 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 mobile body, or the mobile body itself. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile 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 also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0154] Furthermore, a base station in the present disclosure may be read as a terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a terminal is replaced with communication between a plurality of terminals 20 (which may be called, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0155] Similarly, the term "terminal" in the present disclosure may be read as "base station." In this case, the base station may be configured to have the functions of the terminal described above.

[0156] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0157] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0158] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0159] 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."

[0160] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0161] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0162] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0163] A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0164] Numerology may be communication parameters that apply to at least one of transmission and reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by the transceiver in the frequency domain, and specific windowing operations performed by the transceiver in the time domain.

[0165] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may be a time unit based on numerology.

[0166] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0167] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0168] 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 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.

[0169] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate wireless resources (such as frequency bandwidth and transmission power that can be used by each terminal 20) to each terminal 20 in TTI units. Note that the definition of TTI is not limited to this.

[0170] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0171] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0172] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0173] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0174] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0175] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0176] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0177] 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.

[0178] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0179] 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.

[0180] 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 read as "BWP."

[0181] The above-described 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.

[0182] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0183] 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."

[0184] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0185] In the present disclosure, an SS block or a CSI-RS is an example of a synchronization signal or a reference signal.

[0186] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. [Explanation of symbols]

[0187] 10 base station 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 terminals 210 Transmitter 220 Receiving unit 230 Setting Section 240 Control Unit 1001 processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication equipment 1005 Input Device 1006 Output Device

Claims

1. a control unit that determines whether a reference signal can be used to monitor paging at a paging occasion based on a notification signal transmitted from a base station; a receiving unit that receives the reference signal when the reference signal is available, The control unit determines whether one or more reference signals at a specific resource position are available based on at least one of a resource position of the notification signal and sequence information of the notification signal. Terminal.

2. The control unit determines whether the reference signal can be used based on at least one of whether the notification signal has been detected, a resource position of the notification signal, and sequence information of the notification signal. The terminal according to claim 1 .

3. When the receiving unit receives a notification signal from among the plurality of notification signals, the receiving unit does not attempt to detect notification signals subsequent to the notification signal.

3. The terminal according to claim 1 or 2.

4. a control unit that determines whether to transmit a reference signal; a transmitter configured to transmit a notification signal indicating whether the reference signal is available to monitor paging at a paging occasion to a terminal, The terminal determines whether one or more reference signals at a specific resource location are available based on at least one of the resource location of the notification signal and sequence information of the notification signal. Base station.

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