Terminal, base station, communication system, and communication method

Abstract

This terminal is provided with a receiving unit which receives a notification from a base station indicating whether or not a reference signal can be used to perform monitoring of paging on a paging occasion, and a control unit which performs monitoring of paging on the basis of the aforementioned notification.

Description

[Technical field]

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

[0002] 3GPP (3rd Generation Partnership Project) is currently studying a wireless communication system called 5G or NR (New Radio) (hereinafter, this wireless communication system will be referred to as "NR") in order to realize a larger system capacity, a higher data transmission speed, and a lower latency in wireless sections. In NR, various wireless technologies and network architectures are being studied in order to meet the requirements of achieving a throughput of 10 Gbps or more while keeping the latency in wireless sections to 1 ms or less.

[0003] In NR, as in LTE, paging is performed to call a terminal in standby mode when a call is received. In NR, a terminal in RRC_IDLE 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 paging occasion (PO). Hereinafter, a terminal in RRC_IDLE or RRC_INACTIVE state may be called 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, for example, CRS (Cell-specific Reference Signal) in LTE, SSB is transmitted at a relatively long period, so the terminal must wake up earlier than the timing of PO reception to process SSB, which means that it is not possible 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 will be referred to as TRS / CSI-RS.

[0008] However, since it is unclear whether the TRS or CSI-RS is being transmitted from the base station to the terminal (idle / inactive mode UE), the terminal must wake up early, as in the case of using only SSB. This means that the terminal cannot maintain a long sleep period, which leads to an increase in terminal power consumption.

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

[0010] According to the disclosed technique, a notification indicating whether a reference signal can be used for monitoring paging at a paging occasion is provided. and information indicating a period during which the reference signal can be used, A receiving unit for receiving signals from a base station; Said notice and based on the period, A terminal including a control unit that monitors paging. And, The notification includes information regarding switching whether or not the reference signal can be used. is provided. Effect of the Invention

[0011] According to the disclosed technology, a technology is provided that enables a reduction in the amount of power consumption of a terminal during paging monitoring. [Brief description of the drawings]

[0012] [Figure 1] 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. [Diagram 2] 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. [Diagram 3] FIG. 11 is a diagram illustrating an example of an operation for paging monitoring. [Figure 4] FIG. 11 is a diagram illustrating an example of an operation for paging monitoring. [Diagram 5] FIG. 1 is a diagram for explaining a first embodiment. [Figure 6] FIG. 1 is a diagram for explaining a first embodiment. [Figure 7] FIG. 11 is a diagram for explaining a second embodiment. [Figure 8] FIG. 11 is a diagram for explaining a second embodiment. [Figure 9] FIG. 11 is a diagram for explaining a second embodiment. [Figure 10] FIG. 11 is a diagram for explaining a third embodiment. [Figure 11] FIG. 11 is a diagram for explaining a third embodiment. [Figure 12] 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 13] 2 is a diagram illustrating an example of a functional configuration of a terminal 20 according to an embodiment of the present invention. [Figure 14] 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 PREFERRED EMBODIMENTS

[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 the operation of the wireless communication system according to the embodiment of the present invention, an existing technology is appropriately used. The existing technology is, for example, an existing NR, but is not limited to the existing NR.

[0015] In addition, 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 different names.

[0016] (System Configuration) Fig. 1 is a diagram for explaining a wireless communication system in an embodiment of the present invention. As shown in Fig. 1, the wireless communication system in 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. In addition, a TTI (Transmission Time Interval) in the time domain may be a slot, or the 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, for example, transmitted by NR-PBCH or PDSCH, and is also called broadcast information. As shown in FIG. 1, the base station 10 transmits a control signal or data to the terminal 20 in DL (Downlink), and receives a control signal or data from the terminal 20 in UL (Uplink). Note that, here, what is transmitted by a control channel such as PUCCH or PDCCH is called a control signal, and what is transmitted by a shared channel such as 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, a communication module for M2M (Machine-to-Machine), etc. As shown in Fig. 1, the terminal 20 receives a control signal or data from the base station 10 in DL and transmits a control signal or data to the base station 10 in UL, thereby using various communication services provided by the wireless communication system. The terminal 20 may be called a UE, and the base station 10 may be called a gNB.

[0020] Fig. 2 shows a configuration example of a wireless communication system in which 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 other system configurations.

[0023] (Basic operation example) In NR, as in LTE, paging is performed to call a terminal in standby mode when a 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 in 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, a number of slots.

[0025] As described above, when an idle / inactive mode UE in NR performs paging monitoring in a paging occasion (PO), it is necessary to perform reception processing of multiple synchronization signal blocks (SSBs) in advance to perform time / frequency tracking and auto gain control (AGC), etc. 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 side of Fig. 3 shows the SSB reception operation, and the lower side 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 a PO. The terminal 20 sleeps for a long time until the timing of the SSB indicated by A, and wakes up at the timing of the SSB indicated by A. After receiving the SSB indicated by A, the terminal goes to sleep, but since it only sleeps for a short time, some circuits need to be kept running, which consumes power. Similarly, SSB reception is performed at timings B and C, and paging monitoring is performed at the PO.

[0028] (About the assignment) However, since SSB is transmitted at a relatively long period, the terminal 20 must wake up early with respect to the timing of PO reception in order to perform SSB reception processing. This leads to an increase in terminal power consumption because a long sleep period cannot be ensured. 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. In other words, it is possible to perform time / frequency tracking, AGC (auto gain control), etc., using TRS / CSI-RS.

[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, when 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, the 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, it is necessary to wake up a longer time before PO, which increases the amount of 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, basically, information for enabling terminal 20 to use TRS / CSI-RS for paging monitoring in PO is transmitted from base station 10 to terminal 20. Note that in this embodiment, TRS / CSI-RS is given as a reference signal used for paging monitoring, but this is an example, and a reference signal other than TRS / CSI-RS may be used.

[0033] Fig. 4 shows an example of operation when terminal 20 (idle / inactive mode UE) uses TRS for paging monitoring in PO using the above information. Fig. 4 shows an example of using TRS, but CSI-RS may be used instead of TRS. The upper side of Fig. 4 shows the reception operation of TRS, etc., and the lower side shows the power consumption of terminal 20.

[0034] It is assumed that terminal 20 knows, based on the above information received from base station 10, that the TRS shown in D and E of FIG. 4 will be transmitted, and knows the timing, time-frequency resources, and so on.

[0035] Terminal 20 sleeps for a long time until the timing of the SSB indicated by C, and wakes up at the timing of the SSB indicated by C. In the case of Fig. 4, terminal 20 knows that it can receive TRS at timings D and C, so it does not wake up at the timing of the SSB indicated by A as in the case of Fig. 3.

[0036] Terminal 20 receives TRS at timings D and C, and performs paging monitoring at PO. Note that, in the example of Fig. 4, terminal 20 receives SSB and TRS / CSI-RS after a long sleep before PO, but terminal 20 may receive only TRS / CSI-RS before PO after a long sleep.

[0037] Hereinafter, examples of operations relating to information notification from the base station 20 to the terminal 10 will be described as embodiments 1 to 4. The embodiments 1 to 4 can be implemented in any combination.

[0038] Example 1 First, a first embodiment will be described. In the first embodiment, a base station 10 notifies a terminal 20 (idle / inactive mode UE) of the availability of TRS / CSI-RS (information indicating whether TRS / CSI-RS is available). The terminal 20 can determine whether TRS / CSI-RS is transmitted from the base station 10 based on the availability information received from the base station 10. If TRS / CSI-RS is transmitted from the base station 10, the terminal 20 can perform paging monitoring in PO using the TRS / CSI-RS by the operation shown in FIG. 4.

[0039] In addition, the notification of the availability of the TRS / CSI-RS may be rephrased as the notification of the activation / deactivation of the TRS / CSI-RS. Hereinafter, an embodiment 1-1 and an embodiment 1-2 will be described as more specific examples.

[0040] <Example 1-1> In Example 1-1, the base station 10 notifies the terminal 20 of information required for TRS / CSI-RS reception (e.g., time-frequency resource position, beam (QCL) information, etc.) in advance by higher layer signaling. The higher layer signaling is, for example, system information (SIB1, SIB2, etc.) and RRC signaling received in connected mode.

[0041] Then, the base station 10 notifies the terminal 10 of the availability of the TRS / CSI-RS by lower layer signaling. The lower layer signaling is, for example, DCI, MAC CE, reference signal, and the like.

[0042] An operation example of the embodiment 1-1 will be described with reference to Fig. 5. In S101, the base station 10 transmits information required for the above-mentioned TRS / CSI-RS reception to the terminal 20 (idle / inactive mode UE) by higher layer signaling, and the terminal 20 receives the information.

[0043] S101 may be executed when the terminal 20 is in an RRC connected state (connected mode) or when it is in an idle / inactive mode. When S101 is executed for the terminal 20 in the idle / inactive mode, for example, the base station 10 transmits the information at the timing when the terminal 20 wakes up intermittently, and the terminal 20 receives the information at the timing. The timing may be a PO timing or a timing other than a PO. The same applies to higher layer signaling (or semi-static signaling) described below.

[0044] At S102, the base station 10 transmits information indicating that TRS / CSI-RS has become available (i.e., that the base station 10 is transmitting TRS / CSI-RS) to the terminal 20 via lower layer signaling (L1 / L2 signaling), and the terminal 20 receives the information.

[0045] S102 is assumed to be executed for the terminal 20 in the idle / inactive mode. For example, the base station 10 transmits the information at the timing when the terminal 20 wakes up intermittently, and the terminal 20 receives the information at the timing. The timing may be the timing of the PO, or may be a timing other than the PO. The same applies to the lower layer signaling or dynamic signaling described below.

[0046] The terminal 20 can determine from the information received in S102 that the base station 10 has transmitted TRS / CSI-RS, and therefore performs paging monitoring in PO using the TRS / CSI-RS based on the information received in S101. That is, for example, the terminal 20 performs the operation shown in FIG.

[0047] At S103, the base station 10 transmits information indicating that TRS / CSI-RS has become unavailable (i.e., the base station 10 has stopped transmitting TRS / CSI-RS) to the terminal 20 via lower layer signaling (L1 / L2 signaling), and the terminal 20 receives the information.

[0048] The terminal 20 can determine from the information received in S103 that TRS / CSI-RS has not been transmitted from the base station 10, and therefore performs paging monitoring in PO without using TRS / CSI-RS. That is, for example, the terminal 20 performs the operation shown in FIG.

[0049] In addition, in the embodiment 1-1, higher layer signaling may not be performed by S101. In this case, for example, information required for receiving TRS / CSI-RS (e.g., time-frequency resource position, beam (QCL) information, etc.) is defined by a specification or the like and is held in advance by the terminal 20 and the base station 10. The terminal 20 can receive the TRS / CSI-RS by using this information.

[0050] <Example 1-2> In the embodiment 1-2, the base station 10 notifies the terminal 10 of the availability of the TRS / CSI-RS by higher layer signaling.

[0051] In Example 1-2, information required for receiving TRS / CSI-RS (e.g., time-frequency resource position, beam (QCL) information, etc.) is defined, for example, by a specification or the like, and is held in advance by the terminal 20 and the base station 10. The terminal 20 can receive TRS / CSI-RS by using this information.

[0052] Alternatively, information required for TRS / CSI-RS reception (e.g., time-frequency resource position, beam (QCL) information, etc.) may be notified from base station 10 to terminal 20 together with information on the availability of TRS / CSI-RS.

[0053] An operation example of the embodiment 1-2 will be described with reference to Fig. 6. In the example shown in Fig. 6, it is assumed that information required for TRS / CSI-RS reception is held in advance in the terminal 20 and the base station 10.

[0054] In S111, the base station 10 transmits information indicating that TRS / CSI-RS has become available (i.e., that the base station 10 is transmitting TRS / CSI-RS) to the terminal 20 via higher layer signaling, and the terminal 20 receives the information.

[0055] The terminal 20 can determine from the information received in S111 that the base station 10 has transmitted TRS / CSI-RS, and therefore performs paging monitoring in PO using the TRS / CSI-RS based on the information it holds. That is, for example, the terminal 20 performs the operation shown in FIG.

[0056] In S112, the base station 10 transmits, by higher layer signaling, information indicating that TRS / CSI-RS is no longer available (i.e., the base station 10 has stopped transmitting TRS / CSI-RS) to the terminal 20, and the terminal 20 receives the information.

[0057] The terminal 20 can determine from the information received in S112 that TRS / CSI-RS has not been transmitted from the base station 10, and therefore performs paging monitoring in PO without using TRS / CSI-RS. That is, for example, the terminal 20 performs the operation shown in FIG.

[0058] According to the first embodiment, the terminal 20 can determine whether or not TRS / CSI-RS can be used in monitoring paging, so that the amount of power consumption of the terminal 20 can be reduced.

[0059] Example 2 Next, a second embodiment will be described. In the second embodiment, the base station 10 notifies the terminal 20 (idle / inactive mode UE) of the availability of TRS / CSI-RS (information on whether TRS / CSI-RS is available) in one shot. "One shot" means in one signaling. The notification of the availability of TRS / CSI-RS may be performed by higher layer signaling or lower layer signaling.

[0060] In the second embodiment, a correspondence relationship between a notification of TRS / CSI-RS availability and a PO is specified or notified. By receiving a notification of TRS / CSI-RS availability, the terminal 20 can determine whether or not the TRS / CSI-RS can be used for paging monitoring in the PO corresponding to the notification due to this correspondence relationship.

[0061] In addition, in the second embodiment, a default operation of the terminal 20 when a notification of the availability of TRS / CSI-RS corresponding to a certain PO has not been received (e.g., whether or not it is acceptable to assume that the UE will use TRS / CSI-RS) may be notified or specified. More specific examples of the second embodiment will be described below as Example 2-1 and Example 2-2.

[0062] <Example 2-1> In the embodiment 2-1, the base station 10 notifies the terminal 20 in one shot for each availability of TRS / CSI-RS corresponding to one PO. An example will be described with reference to Figs. 7 and 8.

[0063] 7 and 8, information required for TRS / CSI-RS reception (e.g., time-frequency resource position, beam (QCL) information, etc.) may be defined, for example, in a specification or the like and may be held in advance by terminal 20 and base station 10, or may be notified in advance by base station 10 to terminal 20 by higher layer signaling. Moreover, the information may be notified together with a notification of the availability of TRS / CSI-RS.

[0064] Furthermore, the above-mentioned correspondence between the notification of TRS / CSI-RS availability and PO may be defined, for example, in a specification or the like and may be held in advance by terminal 20 and base station 10, or may be notified in advance by base station 10 to terminal 20 by higher layer signaling. Furthermore, information indicating the correspondence may be notified together with the notification of TRS / CSI-RS availability.

[0065] Furthermore, the above-mentioned default operation may be defined, for example, in a specification or the like and may be held in advance by the terminal 20 and the base station 10, or may be notified in advance by the base station 10 to the terminal 20 by higher layer signaling. Furthermore, information indicating the default operation may be notified together with the notification of the availability of TRS / CSI-RS.

[0066] Information required for TRS / CSI-RS reception, the corresponding relationship, and information on default operations may be notified together in advance from base station 10 to terminal 20 by higher layer signaling.

[0067] First, a description will be given of the example shown in Fig. 7. In S201, the base station 10 transmits information indicating that TRS / CSI-RS is available to the terminal 20, and the terminal 20 receives this information.

[0068] In the example of Fig. 7, the "correspondence relationship" is "a notification of TRS / CSI-RS availability corresponds to a PO from that notification to before the next notification of TRS / CSI-RS availability." As an example, Fig. 7 assumes that there is basically one PO between notifications.

[0069] Therefore, when terminal 20 receives the notification in S201, it determines that it can use TRS / CSI-RS for the period from after the notification in S201 to before PO#1 for paging monitoring in PO#1. In other words, it determines that base station 10 transmits TRS / CSI-RS during this period. Therefore, when terminal 20 receives the notification in S201, it uses TRS / CSI-RS for the period from after the notification in S201 to before PO#1 for paging monitoring in PO#1.

[0070] The same applies to the reception of the notification in S202 and the paging monitoring of PO#2.

[0071] In S203, the base station 10 transmits information indicating that TRS / CSI-RS is unavailable to the terminal 20, and the terminal 20 receives this information. In this case, the terminal 20 performs paging monitoring in PO#3 without using TRS / CSI-RS, that is, for example, by the operation shown in Fig. 3. The same applies to S204 and PO#5.

[0072] After S203, the terminal 20 does not receive a notification of TRS / CSI-RS availability at the timing when the notification should be received. This may be the case where the base station 10 does not transmit a notification, or the case where the base station 10 transmits a notification but the terminal 20 fails to receive the notification due to poor wireless quality.

[0073] If the default operation when a notification of TRS / CSI-RS availability is not received at the timing when it should be received is "using TRS / CSI-RS", terminal 20 performs paging monitoring at PO#4 using TRS / CSI-RS. If the default operation when a notification of TRS / CSI-RS availability is not received at the timing when it should be received is "not using TRS / CSI-RS", terminal 20 performs paging monitoring at PO#4 without using TRS / CSI-RS (e.g., the operation in FIG. 3).

[0074] Next, an example shown in Fig. 8 will be described. In S211, the base station 10 transmits information indicating that TRS / CSI-RS is available to the terminal 20, and the terminal 20 receives this information.

[0075] In the example of FIG. 8, the "correspondence relationship" is "a notification of TRS / CSI-RS availability corresponds to the PO from the notification following that notification to the PO before the next notification."

[0076] Therefore, when the terminal 20 receives the notification in S211, the terminal 20 determines that TRS / CSI-RS can be used for paging monitoring in PO#2. Therefore, the terminal 20 uses TRS / CSI-RS for paging monitoring in PO#2. Note that for paging monitoring in PO#1, the availability of TRS / CSI-RS has been determined based on the previous notification.

[0077] The same applies to the reception of the notification in S212 and the paging monitoring of PO#3.

[0078] In S213, the base station 10 transmits information indicating that TRS / CSI-RS is unavailable to the terminal 20, and the terminal 20 receives this information. In this case, the terminal 20 performs paging monitoring in PO#4 without using TRS / CSI-RS, that is, for example, by the operation shown in Fig. 3. The same applies to S214 and subsequent POs.

[0079] After S213, the terminal 20 does not receive a notification of TRS / CSI-RS availability at the timing when the notification should be received. This may be the case when the base station 10 does not transmit a notification, or when the base station 10 transmits a notification but the terminal 20 fails to receive the notification due to poor wireless quality.

[0080] If the default operation when a notification of TRS / CSI-RS availability is not received at the timing when it should be received is "using TRS / CSI-RS", terminal 20 performs paging monitoring at PO#5 using TRS / CSI-RS. If the default operation when a notification of TRS / CSI-RS availability is not received at the timing when it should be received is "not using TRS / CSI-RS", terminal 20 performs paging monitoring at PO#5 without using TRS / CSI-RS (e.g., the operation in FIG. 3).

[0081] Note that the correspondence relationship in which there is a corresponding PO between notifications as described with reference to Figures 7 and 8 is one example. In addition to such a correspondence relationship, a direct correspondence relationship between a PO and a notification may be specified or notified.

[0082] The correspondence may be, for example, a correspondence that makes one PO correspond to one notification (e.g., PO#1-notification#1, PO#2-notification#2, ...). If this example is used in the example of Fig. 7, for example, the notification of S201 may include information that specifies PO#1, and the notification of PS202 may include information that specifies PO#2.

[0083] As described above, the notification may or may not include information explicitly specifying the PO. In the case where the notification does not include information explicitly specifying the PO, the resource (time resource, frequency resource, or time-frequency resource) on which the notification is transmitted may be associated with the PO.

[0084] <Relationship between notifications and TRS / CSI-RS> Regarding notification of availability of TRS / CSI-RS corresponding to one PO, for example, availability may be notified collectively for multiple TRS / CSI-RS corresponding to multiple beams in one PO.

[0085] In this case, for example, if TRS / CSI-RS is transmitted twice in each of beams 1 to 4 in the period between the notification of S201 in Figure 7 and PO#1, terminal 20 can determine that any of the TRS / CSI-RS transmitted twice in each of beams 1 to 4 will be transmitted, and therefore terminal 20 may use any of these TRS / CSI-RS.

[0086] Furthermore, notification of availability of TRS / CSI-RS corresponding to one PO may be, for example, a notification corresponding to TRS / CSI-RS of one beam in one PO. In this case, availability may be notified collectively for multiple TRS / CSI-RS repeatedly transmitted in that one beam.

[0087] 7, for example, information indicating that "TRS / CSI-RS of beam 1 can be used" is notified for PO#1. If TRS / CSI-RS is transmitted four times in beam 1 during the period between the notification and PO#1, terminal 20 can determine that any of the TRS / CSI-RS transmitted four times in beam 1 will be transmitted, and therefore terminal 20 may use any of the TRS / CSI-RS of beam 1.

[0088] <Example 2-2> Next, an embodiment 2-2 will be described. In the embodiment 2-2, the availability of TRS / CSI-RS is notified in one shot for each TRS / CSI-RS transmission.

[0089] An example will be described with reference to Fig. 9. In S221, the base station 10 transmits information indicating that TRS / CSI-RS is available to the terminal 20, and the terminal 20 receives this information. In this example, the notification of the availability of TRS / CSI-RS corresponds to the TRS / CSI-RS that is transmitted first after the notification. Therefore, the terminal 20 can use the TRS / CSI-RS transmitted in S222 for paging monitoring in PO#1. The same applies to S223 and S224.

[0090] In S225, the base station 10 transmits information indicating that TRS / CSI-RS is unavailable to the terminal 20, and the terminal 20 receives this information. Therefore, the terminal 20 does not use TRS / CSI-RS for paging monitoring in PO#2. Therefore, the terminal 20 performs paging monitoring in PO#2 using SSB in the same manner as the operation in FIG.

[0091] Note that the notification of the availability of TRS / CSI-RS corresponds to the TRS / CSI-RS transmitted first after the notification, which is an example. The notification may correspond to a TRS / CSI-RS other than the TRS / CSI-RS transmitted first after the notification. For example, the flow may be notification #1 → notification #2 → TRS #1 → TRS #2. In this case, for example, the base station 10 transmits notification #1 indicating that TRS #1 is available, and then transmits notification #2 indicating that TRS #2 is available. By receiving these, the terminal 20 determines that the TRS #1 corresponding to notification #1 and the TRS #2 corresponding to notification #2 are available. If the PO is located immediately after the TRS #2, the terminal 20 can perform paging monitoring at the PO by using the TRS #1 and TRS #2 received after the notification #2.

[0092] According to the second embodiment, the terminal 20 can determine whether or not TRS / CSI-RS can be used in monitoring paging, which makes it possible to reduce the amount of power consumed by the terminal 20. Furthermore, in the second embodiment, the availability of TRS / CSI-RS can be controlled with finer granularity.

[0093] Example 3 Next, a third embodiment will be described. In the third embodiment, the base station 10 semi-statically notifies the terminal 20 (idle / inactive mode UE) of the availability of TRS / CSI-RS (information on whether TRS / CSI-RS is available). The semi-static notification of the availability of TRS / CSI-RS may be performed by higher layer signaling or lower layer signaling.

[0094] In the third embodiment, a default operation of terminal 20 in the case where the availability of TRS / CSI-RS is not notified (e.g., whether or not it is acceptable to assume that the UE will use TRS / CSI-RS) may be notified or specified.

[0095] Also in the third embodiment, information required for TRS / CSI-RS reception (e.g., time-frequency resource position, beam (QCL) information, etc.) may be defined, for example, in a specification or the like and may be held in advance by the terminal 20 and the base station 10, or may be notified in advance by the base station 10 to the terminal 20 by higher layer signaling, similar to the example shown in Fig. 5. Moreover, the information may be notified together with the notification of the availability of TRS / CSI-RS.

[0096] Furthermore, the above-mentioned default operation may be defined, for example, in a specification or the like and may be held in advance by the terminal 20 and the base station 10, or may be notified in advance by the base station 10 to the terminal 20 by higher layer signaling. Moreover, the information may be notified together with the notification of the availability of TRS / CSI-RS.

[0097] Information required for TRS / CSI-RS reception and information on default operations may be notified in advance from base station 10 to terminal 20 together with notification of the availability of TRS / CSI-RS.

[0098] More specific examples of Example 3 will be described below as Example 3-1 and Example 3-2.

[0099] <Example 3-1> In Example 3-1, until switching of TRS / CSI-RS availability is notified, the notification operation before that notification is applied.

[0100] With reference to Fig. 10, the example 3-1 will be described in more detail. In S301, the base station 10 transmits activation (notification of availability) of TRS / CSI-RS to the terminal 20. The terminal 20 receives the activation. In S302, the base station 10 transmits deactivation (notification of unavailability) of TRS / CSI-RS to the terminal 20. The terminal 20 receives the deactivation.

[0101] The terminal 20 assumes that it can use TRS / CSI-RS for paging monitoring in a PO during the period from when it receives activation in S301 until it receives deactivation in S302. Therefore, during this period, if there is a PO, it uses TRS / CSI-RS for paging monitoring in that PO.

[0102] In S302, the base station 10 transmits deactivation (notification of unavailability) of TRS / CSI-RS to the terminal 20. The terminal 20 receives the deactivation. In S303, the base station 10 transmits activation (notification of availability) of TRS / CSI-RS to the terminal 20. The terminal 20 receives the activation.

[0103] The terminal 20 assumes that TRS / CSI-RS cannot be used for paging monitoring in a PO during the period from when it receives deactivation in S302 until it receives activation in S303. Therefore, even if a PO exists during this period, the terminal 20 does not use TRS / CSI-RS for paging monitoring in the PO.

[0104] <Example 3-2> In Example 3-2, if the availability of TRS / CSI-RS is not notified for a certain period of time, the availability of TRS / CSI-RS is switched from the state previously notified. A timer, for example, is used to measure the certain period of time. For example, after being notified of activation of TRS / CSI-RS, if activation or deactivation of TRS / CSI-RS is not notified for the timer period, terminal 20 switches the state to deactivate TRS / CSI-RS (makes it unavailable).

[0105] The timer value may be defined, for example, in a specification or the like and may be held in advance by the terminal 20 and the base station 10, or may be notified in advance from the base station 10 to the terminal 20 by higher layer signaling or the like. Also, the timer value may be notified together with activation or deactivation of TRS / CSI-RS.

[0106] Example 3-2 will be described more specifically with reference to Fig. 11. In S311, the base station 10 transmits activation (notification of availability) of the TRS / CSI-RS to the terminal 20. The terminal 20 receives the activation and starts a timer.

[0107] In S311, when the terminal 20 receives activation of the TRS / CSI-RS from the base station 10 before the timer expires, the terminal 20 restarts (resets and starts) the timer.

[0108] Thereafter, the timer expires in S313 without receiving either activation or deactivation. During the period from S311 to S313, terminal 20 is able to use TRS / CSI-RS.

[0109] In S313, terminal 20 switches the availability state of TRS / CSI-RS from activation to deactivation. In S314, terminal 20 receives activation of TRS / CSI-RS from base station 20. During the period from S313 to S314, terminal 20 assumes that it is not possible to use TRS / CSI-RS. After S314, terminal 20 assumes that it is possible to use TRS / CSI-RS until the timer expires (or until deactivation is received).

[0110] According to the third embodiment, the terminal 20 can determine whether or not TRS / CSI-RS can be used in monitoring paging, which makes it possible to reduce the amount of power consumed by the terminal 20. Furthermore, in the third embodiment, control using a timer is possible, which makes it possible to reduce signaling.

[0111] Example 4 Next, a description will be given of Example 4. Example 4 is applicable to any of Examples 1 to 3.

[0112] In the fourth embodiment, the period or the number of times during which the availability of TRS / CSI-RS is applied is notified from the base station 10 to the terminal 20. The availability of TRS / CSI-RS may indicate that TRS / CSI-RS is available or that TRS / CSI-RS is unavailable.

[0113] More specifically, the notification content includes, for example, the period (X ms, Y slots, etc.) during which TRS / CSI-RS availability is applied, the number of times it is applied (the number of TRS / CSI-RS occasions, the number of POs, etc.), etc.

[0114] Regarding the notification method, for example, the base station 10 notifies the terminal 20 in advance by higher layer signaling of the period or the number of times during which the availability of TRS / CSI-RS is applied.

[0115] Furthermore, the period or number of times that the TRS / CSI-RS availability is applied may be notified when the base station 10 notifies the terminal 20 of the availability of the TRS / CSI-RS. That is, in this case, the period or number of times that the TRS / CSI-RS availability is applied is notified together with the notification of the TRS / CSI-RS availability.

[0116] As an example, in S102 of FIG. 5, if the base station 10 notifies the terminal 20 of the availability of TRS / CSI-RS and of "Yslot," the terminal 20 uses the TRS / CSI-RS for paging monitoring at PO from the point of S102 to the period of Yslot.

[0117] According to the fourth embodiment, the terminal 20 can grasp whether or not TRS / CSI-RS can be used in monitoring paging based on the number of times or the period, and the amount of power consumption of the terminal 20 can be reduced.

[0118] (Device configuration) Next, a functional configuration example of the base station 10 and the terminal 20 that execute the processes and operations described above will be described. The base station 10 and the terminal 20 include functions for implementing the above-mentioned embodiments 1 to 4. However, the base station 10 and the terminal 20 may each have only the functions of any one of the embodiments 1 to 4.

[0119] <Base station 10> Fig. 12 is a diagram showing an example of the functional configuration of the base station 10. As shown in Fig. 12, 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. 12 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 110 and the receiving unit 120 may be called a communication unit.

[0120] The transmitting unit 110 has a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal wirelessly. The receiving unit 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 transmitting unit 110 also has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL data, and the like to the terminal 20. The transmitting unit 110 also transmits the notifications described in the first to fourth embodiments to the terminal 20.

[0121] 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 necessary.

[0122] 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.

[0123] <Terminal 20> Fig. 13 is a diagram showing an example of the functional configuration of the terminal 20. As shown in Fig. 13, 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. 13 is merely an example. As long as the operation related to the embodiment of the present invention can be executed, the names of the functional divisions and the functional units may be any. The transmitting unit 210 and the receiving unit 220 may be called a communication unit.

[0124] The transmitter 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The receiver 220 receives various signals wirelessly and obtains a higher layer signal from the received physical layer signal.

[0125] The setting unit 230 stores various pieces of setting information received from the base station 10 by the receiving unit 220 in a storage device, and reads them out from the storage device as necessary. The setting unit 230 also stores setting information that is set in advance. The contents of the setting information are, for example, information received by higher layer signaling or the like described in the first to fourth embodiments.

[0126] The control unit 240 controls paging monitoring in the PO based on information received from the base station 10. For example, the control unit 240 determines whether or not to perform paging monitoring in the PO by using TRS / CSI-RS. Note that the functional unit related to signal transmission in the control unit 240 may be included in the transmission unit 210, and the functional unit related to signal reception in the control unit 240 may be included in the reception unit 220. Furthermore, the transmission unit 210 and the reception unit 220 may be called a transmitter and a receiver, respectively.

[0127] According to the present embodiment, at least the terminal, base station, and paging method described in the following items are provided, for example. (Section 1) a receiving unit for receiving, from a base station, a notification indicating whether a reference signal is available for monitoring paging at a paging occasion; a control unit that monitors paging based on the notification; A terminal comprising: (Section 2) The receiving unit receives information required for receiving the reference signal from the base station by higher layer signaling. 2. The terminal described in paragraph 1. (Section 3) The notification is associated with the paging occasion, and if the receiving unit does not receive the notification, the control unit executes a default operation at the paging occasion corresponding to the notification. 3. A terminal as described in claim 1 or 2. (Section 4) The control unit starts a timer when the receiving unit receives a first notification indicating whether or not a reference signal can be used to monitor paging at a paging occasion, and switches a state of whether or not a reference signal can be used based on the first notification when the timer expires before a second notification is received. A terminal according to any one of claims 1 to 3. (Section 5) A control unit that controls whether or not to transmit a reference signal; a transmitter for transmitting a notification to the terminal indicating whether the terminal is capable of using a reference signal to monitor paging at a paging occasion; A base station comprising: (Section 6) receiving an indication from a base station indicating whether a reference signal is available for paging monitoring at a paging occasion; monitoring paging based on the notification; A paging method performed by a terminal, comprising:

[0128] Any of items 1 to 6 makes it possible to reduce the amount of power consumed by a terminal during paging monitoring.

[0129] (Hardware configuration) The block diagrams (FIGS. 12 and 13) 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 of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically combined, or may be realized using two or more devices that are physically or logically separated and directly or indirectly connected (e.g., using wires, wirelessly, etc.) and these multiple devices. The functional blocks may be realized by combining the one device or the multiple devices with software.

[0130] 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. In either case, as described above, there is no particular limitation on the method of realization.

[0131] For example, the base station 10, the terminal 20, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 19 is a diagram showing an example of a hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The above-mentioned base station 10 and the terminal 20 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.

[0132] In the following description, the term "apparatus" can be interpreted 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 devices shown in the figure, or may be configured to exclude some of the devices.

[0133] Each function in the base station 10 and the terminal 20 is realized by loading a specific software (program) onto hardware such as a processor 1001, a memory device 1002, etc., so that the processor 1001 performs calculations, controls communications by the communication device 1004, and controls at least one of reading and writing of data in the memory device 1002 and the auxiliary memory device 1003.

[0134] 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.

[0135] Moreover, the processor 1001 reads out a program (program code), a software module, data, or the like from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and executes various processes according to the program. As the program, a program that causes a computer to execute at least a part of the operations described in the above-mentioned embodiment is used. For example, the control unit 140 of the base station 10 shown in FIG. 12 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001. Also, for example, the control unit 240 of the terminal 20 shown in FIG. 13 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001. Although the above-mentioned various processes have been described as being executed by one processor 1001, they may be executed by two or more processors 1001 simultaneously or sequentially. The processor 1001 may be implemented by one or more chips. The program may be transmitted from a network via a telecommunication line.

[0136] The storage device 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 storage device 1002 may also be called a register, a cache, a main memory (primary storage device), etc. The storage device 1002 can store a program (program code), software modules, etc. that are executable to implement a communication method according to an embodiment of the present disclosure.

[0137] The auxiliary 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 (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. The auxiliary storage device 1003 may be referred to as an auxiliary storage device. The above-mentioned storage medium may be, for example, a database, a server, or other suitable medium including at least one of the storage device 1002 and the auxiliary storage device 1003.

[0138] The communication device 1004 is hardware (transmission and 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, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, a transmission and reception antenna, an amplifier unit, a transmission and reception unit, a transmission line interface, etc. may be realized by the communication device 1004. The transmission and reception unit may be implemented as a transmission unit and a reception unit that are physically or logically separated from each other.

[0139] 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).

[0140] In addition, 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.

[0141] Furthermore, the base station 10 and the terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an 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.

[0142] (Supplementary embodiment) Although the embodiment of the present invention has been described above, the disclosed invention is not limited to such an embodiment, and those skilled in the art will understand various modifications, modifications, alternatives, replacements, and the like. Although the description has been given using specific numerical examples to facilitate understanding of the invention, unless otherwise specified, those 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, and matters described in two or more items may be used in combination as necessary, and matters described in one item may be applied to matters described in another item (as long as there is no contradiction). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical parts. The operations of multiple functional units may be physically performed by one part, or the operations of one functional unit may be physically performed by multiple parts. The order of the processing procedures described in the embodiment may be changed as long as there is no contradiction. For convenience of the processing description, the base station 10 and the terminal 20 have been described using functional block diagrams, but such devices may be realized by hardware, software, or a combination thereof. The software operated by the processor possessed by the base station 10 in accordance with an embodiment of the present invention and the software operated by the processor possessed by the terminal 20 in accordance with an embodiment of the present invention may each be stored in a random access memory (RAM), flash memory, read only memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

[0143] 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 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.

[0144] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 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), and 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.

[0145] The steps, sequences, flow charts, etc. of each aspect / embodiment described herein may be reordered 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.

[0146] In this specification, a specific operation performed by the base station 10 may 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 other network nodes other than the base station 10 (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 10, the other network node may be a combination of multiple other network nodes (e.g., MME and S-GW).

[0147] 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.

[0148] The input and output information may be stored in a specific location (e.g., memory) or may be managed using a management table. The input and output information may be overwritten, updated, or added to. The output information may be deleted. The input information may be transmitted to another device.

[0149] 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).

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0155] 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.

[0156] 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., 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 limiting in any way.

[0157] In the present 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", "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.

[0158] A base station can accommodate one or more (e.g., three) cells. 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 (RRH: Remote Radio Head). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or a base station subsystem that provides communication services in this coverage.

[0159] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0160] 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.

[0161] 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 IoT (Internet of Things) device such as a sensor.

[0162] Furthermore, the base station in the present disclosure may be read as a terminal. For example, each aspect / embodiment 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, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0163] Similarly, the terminal in the present disclosure may be read as a base station. In this case, the base station may be configured to have the functions of the terminal described above.

[0164] 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.

[0165] 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.

[0166] The reference signal may be abbreviated as RS (Reference Signal) and may be called a pilot depending on the applicable standard.

[0167] 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."

[0168] 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 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 precede the second element in some way.

[0169] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0170] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Further, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0171] 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.

[0172] The numerology may be communication parameters that apply to the transmission and / or reception of a signal or channel, such as, 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.

[0173] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. A slot may be a time unit based on numerology.

[0174] A slot may include multiple minislots. Each minislot may be composed of one or multiple 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.

[0175] 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.

[0176] 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 expressing the TTI may be called a slot, a minislot, or the like, instead of a subframe.

[0177] 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 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.

[0178] 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.

[0179] 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.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] 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.

[0184] Note that 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.

[0185] 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.

[0186] 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 an 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.

[0187] 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.

[0188] 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".

[0189] 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.

[0190] 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.

[0191] 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."

[0192] 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).

[0193] In addition, in the present disclosure, an SS block or a CSI-RS is an example of a synchronization signal or a reference signal.

[0194] 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]

[0195] 10 base station 110 Transmitter 120 Receiving unit 130 Setting section 140 Control section 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 receiving unit that receives, from a base station, a notification indicating whether a reference signal can be used to monitor paging at a paging occasion and information indicating a period during which the reference signal can be used; A terminal including: a control unit that performs monitoring of paging using the reference signal based on the notification and the period; The notification includes information regarding switching whether or not the reference signal can be used.

2. a control unit for determining whether a reference signal is available for monitoring paging at a paging occasion and a period during which the reference signal is available; A base station including: a transmitter configured to transmit, to a terminal, a notification indicating whether the reference signal is available or not and information indicating a period during which the reference signal is available, The notification includes information regarding switching whether or not the reference signal can be used.

3. a receiving unit that receives, from a base station, a notification indicating whether a reference signal can be used to monitor paging at a paging occasion and information indicating a period during which the reference signal can be used; A terminal including: a control unit that performs monitoring of paging using the reference signal based on the notification and the period; The notification includes information regarding switching whether or not the reference signal can be used; and a control unit that determines whether to transmit the reference signal and a period during which the reference signal is available; a transmitting unit configured to transmit to a terminal a notification indicating whether the reference signal is available or not and information indicating a period during which the reference signal is available; A base station comprising: A communication system comprising:

4. receiving, from a base station, a notification indicating whether a reference signal is available for monitoring paging at a paging occasion and information indicating a period during which the reference signal is available; A communication method executed by a terminal, comprising: a step of monitoring paging using the reference signal based on the notification and the period, A communication method, wherein the notification includes information regarding switching whether or not the reference signal can be used.

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