Terminal, base station and paging method

Abstract

Provided is a terminal having: a receiving unit that receives from a base station a notification indicating whether a reference signal can be used for monitoring paging in a paging occasion; and a control unit that performs monitoring of paging based on the notification.

Description

Technical Field

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

[0002] In 3GPP (3rd Generation Partnership Project), in order to further increase system capacity, further increase data transmission speed, and further reduce latency in a wireless section, etc., research on a wireless communication method called 5G or NR (New Radio) (hereinafter, this wireless communication method will be referred to as "NR") has been carried out. In NR, in order to meet the requirement conditions of achieving a throughput of 10 Gbps or more and making the latency in the wireless section 1 ms or less, various wireless technologies and network architectures have been studied.

[0003] Similar to LTE, in NR, paging of a terminal in a call waiting / residence state during an incoming call is also performed. In NR, a terminal in the RRC_IDLE state or the RRC_INACTIVE state performs an intermittent reception operation (Non-Patent Document 1) for power saving in order to monitor paging DCI. In the intermittent reception operation, the period during which the terminal is awakened from the sleep state and paging monitoring is performed is called a PO (paging occasion). Hereinafter, a terminal in the RRC_IDLE state or the RRC_INACTIVE state may sometimes be referred to as an idle / inactive mode UE.

[0004] Prior Art Documents

[0005] Non-Patent Documents

[0006] Non-Patent Document 1: 3GPP TS 38.304 V16.1.0 (2020-07) Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] When an idle / inactive mode UE in NR performs paging monitoring during a PO (paging occasion), in order to perform time / frequency tracking and AGC (auto gain control), etc. in advance, reception processing of a plurality of SSBs (synchronization signal blocks) needs to be performed.

[0009] However, for example, when compared with the CRS (Cell-specific reference signal) in LTE, the SSB is transmitted in a relatively long cycle. Therefore, in order for the terminal to perform SSB reception processing, it must wake up earlier than the timing of receiving the PO. As a result, a long-term sleep cannot be ensured, leading to an increase in the power consumption of the terminal.

[0010] In order to perform paging monitoring, it is possible to consider using, in addition to the SSB, the TRS (Tracking Reference Signal) or the CSI-RS (Channel State Information Reference Signal). Hereinafter, the TRS or the CSI-RS will be referred to as the TRS / CSI-RS.

[0011] However, in a terminal (idle / inactive mode UE), it is not clear whether the TRS or the CSI-RS is transmitted from the base station. Therefore, similarly to the case of using only the SSB, it is necessary to wake up early. As a result, a long-term sleep cannot be ensured, leading to an increase in the power consumption of the terminal.

[0012] The present invention has been made in view of the above circumstances, and an object thereof is to provide a technique capable of reducing the power consumption of a terminal during paging monitoring.

[0013] Means for Solving the Problem

[0014] According to the disclosed technique, there is provided a terminal including: a receiving unit that receives, from a base station, a notification indicating whether a reference signal can be used to perform paging monitoring at a paging timing; and a control unit that performs paging monitoring based on the notification.

[0015] Advantageous Effects of the Invention

[0016] According to the disclosed technique, there is provided a technique capable of reducing the power consumption of a terminal during paging monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a diagram for explaining a wireless communication system in an embodiment of the present invention.

[0018] Figure 2 It is a diagram for explaining a wireless communication system in an embodiment of the present invention.

[0019] Figure 3 It is a diagram showing an operation example for paging monitoring.

[0020] Figure 4 It is a diagram showing an operation example for paging monitoring.

[0021] Figure 5 It is a diagram for explaining Embodiment 1.

[0022] Figure 6 It is a diagram for explaining Embodiment 1.

[0023] Figure 7 It is a diagram for explaining Embodiment 2.

[0024] Figure 8 It is a diagram for explaining Embodiment 2.

[0025] Figure 9 It is a diagram for explaining Embodiment 2.

[0026] Figure 10 It is a diagram for explaining Embodiment 3.

[0027] Figure 11 It is a diagram for explaining Embodiment 3.

[0028] Figure 12 It is a diagram showing an example of the functional structure of the base station 10 in the embodiment of the present invention.

[0029] Figure 13 It is a diagram showing an example of the functional structure of the terminal 20 in the embodiment of the present invention.

[0030] Figure 14 It is a diagram showing an example of the hardware structure of the base station 10 or the terminal 20 in the embodiment of the present invention. Detailed Embodiments

[0031] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the embodiments described below are merely examples, and the embodiments applying the present invention are not limited to the following embodiments.

[0032] When the wireless communication system according to the embodiment of the present invention operates, existing technologies can be appropriately used. However, this existing technology is, for example, existing NR, but is not limited to existing NR.

[0033] In addition, in this specification, terms used in existing NR or LTE standards such as PUSCH, PDCCH, RRC, MAC, and DCI are used, but the names represented by channel names, protocol names, signal names, function names, etc. used in this specification may also be referred to as other names.

[0034] (System Structure)

[0035] Figure 1This is a diagram for explaining the wireless communication system in the embodiments of the present invention. As Figure 1 shown, the wireless communication system in the embodiments of the present invention includes a base station 10 and a terminal 20. Figure 1 One base station 10 and one terminal 20 are respectively shown in the figure, but this is only an example, and there may be multiple of each.

[0036] 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 the wireless signal are defined by the time domain and the frequency domain. The time domain can be defined by the number of OFDM symbols, and the frequency domain can be defined by the number of subcarriers or the number of resource blocks. In addition, the TTI (Transmission Time Interval) in the time domain can be a time slot, and the TTI can also be a subframe.

[0037] The base station 10 sends synchronization signals and system information, etc. to the terminal 20. The synchronization signals are, for example, NR-PSS and NR-SSS. The system information is sent, for example, through NR-PBCH or PDSCH, and is also called broadcast information. As Figure 1 shown, the base station 10 sends control signals or data to the terminal 20 through the DL (Downlink), and receives control signals or data from the terminal 20 through the UL (Uplink). Additionally, here, the signals sent through control channels such as PUCCH and PDCCH are called control signals, and the signals sent through shared channels such as PUSCH and PDSCH are called data, but these are just examples.

[0038] The terminal 20 is a communication device with a wireless communication function such as a smart phone, a mobile phone, a tablet computer, a wearable terminal, a communication module for M2M (Machine-to-Machine), etc. As Figure 1 shown, the terminal 20 receives control signals or data from the base station 10 through the DL, and sends control signals or data to the base station 10 through the UL, thereby utilizing various communication services provided by the wireless communication system. Additionally, the terminal 20 can be called a UE, and the base station 10 can be called a gNB.

[0039] Figure 2 Shows an example of the structure of the wireless communication system when DC (Dual connectivity) is performed. As Figure 2 shown, it has a base station 10A as the MN (Master Node) and a base station 10B as the SN (Secondary Node). The base station 10A and the base station 10B are respectively connected to the core network. The terminal 20 communicates with both the base station 10A and the base station 10B.

[0040] The cell group provided by the base station 10A acting as the MN is referred to as the MCG (Master Cell Group), and the cell group provided by the base station 10B acting as the SN is referred to as the SCG (Secondary Cell Group).

[0041] The processing operations in this embodiment can be executed by Figure 1 the system structure shown, or can be executed by Figure 2 the system structure shown, or can also be executed by system structures other than these.

[0042] (Basic operation example)

[0043] Similar to LTE, in NR, paging of the terminal in call waiting during incoming calls is also performed. In NR, the terminal 20 (idle / inactive mode UE) performs discontinuous reception operations (Non-Patent Document 1) for power saving in order to monitor paging DCI. During the discontinuous reception operation, the period in which the terminal 20 is woken up from the sleep state for paging monitoring is referred to as a PO (paging occasion).

[0044] The terminal 20 monitors one PO, for example, in each DRX cycle. A PO is composed of multiple time slots, for example.

[0045] As described above, when the idle / inactive mode UE in NR performs paging monitoring in a PO (paging occasion), it is necessary to perform reception processing of multiple SSBs (synchronization signal blocks) in order to perform time / frequency tracking and AGC (auto gain control) in advance. In addition, the number of the previously received SSBs varies according to the reception quality.

[0046] Refer to Figure 3 to describe an example of the operation of the terminal 20 when receiving an SSB before a PO. Figure 3 The upper side of represents the SSB reception operation, and the lower side represents the power consumption of the terminal 20.

[0047] As an example, Figure 3An example is shown where the period of the SSB is 20 ms and three SSBs are received before the PO. The terminal 20 goes into a long sleep until the timing of the SSB shown as A, and wakes up at the timing of the SSB shown as A. After receiving the SSB shown as A, although it is in a short sleep, since some circuits need to be started, there is power consumption. SSB reception is similarly performed at the timings of B and C, and paging monitoring is performed in the PO.

[0048] (Regarding the problem)

[0049] However, since the SSB is transmitted at a relatively long period, in order for the terminal 20 to perform SSB reception processing, it must wake up earlier than the timing of receiving the PO. Therefore, it is impossible to ensure a long sleep, resulting in an increase in the power consumption of the terminal. In the Figure 3 example, the long sleep must end 60 ms before the PO.

[0050] As described above, in order to perform paging monitoring, in addition to or instead of the SSB, it is possible to consider using the reference signals TRS / CSI-RS that are transmitted at a shorter period than the SSB. That is, it is possible to consider using TRS / CSI-RS for time / frequency tracking and AGC (auto gain control), etc.

[0051] However, TRS / CSI-RS is a reference signal used by the terminal 20 (connected mode UE) in the RRC connected state, and is not necessarily always transmitted in the cell (and beam) where the terminal 20 camps. For example, when there are no connected mode UEs in the beam within the cell, the base station 10 sometimes determines that it is not necessary to transmit TRS / CSI-RS and controls not to transmit TRS / CSI-RS.

[0052] When it is not clear whether TRS / CSI-RS is transmitted, the terminal 20 cannot judge in advance which timing is sufficient for waking up. Therefore, similar to the case of using the Figure 3 shown SSB, it is necessary to wake up earlier than the PO for a longer time, increasing the power consumption.

[0053] (Example of operation when using TRS / CSI-RS)

[0054] An operation example for solving the above problems will be described below. In the present embodiment, the information of TRS / CSI-RS that the terminal 20 can use for paging monitoring in the PO is basically sent from the base station 10 to the terminal 20. In addition, in the present embodiment, TRS / CSI-RS is cited as the reference signal used for paging monitoring, but this is an example, and reference signals other than TRS / CSI-RS can also be used.

[0055] Figure 4 An operation example is shown in the case where the terminal 20 (idle / inactive mode UE) uses the TRS for paging monitoring in the PO by using the above information. As an example, Figure 4 The case of using the TRS is shown, but the CSI-RS can also be used instead of the TRS. Figure 4 The upper side shows the reception operation of the TRS, etc., and the lower side shows the power consumption of the terminal 20.

[0056] The terminal 20 uses the above information received from the base station 10 and understands that Figure 4 The cases where the TRS shown in D and E are transmitted, and their timings, time-frequency resources, etc.

[0057] The terminal 20 goes into a long sleep until the timing of the SSB shown in C, and wakes up at the timing of the SSB shown in C. In Figure 4 this case, the terminal 20 understands that it can receive the TRS at the timings of D and C, so as in Figure 3 this case, it does not wake up at the timing of the SSB shown in A.

[0058] The terminal 20 receives the TRS at the timings of D and C and performs paging monitoring in the PO. In addition, in Figure 4 this example, after a long sleep before the PO, the terminal 20 receives the SSB and the TRS / CSI-RS, but after a long sleep before the PO, the terminal 20 can also receive only the TRS / CSI-RS.

[0059] The operation examples related to the information notification from the base station 20 to the terminal 10 will be described below as Examples 1 to 4. Examples 1 to 4 can be implemented in any combination.

[0060] (Example 1)

[0061] First, Example 1 will be described. In Example 1, the base station 10 notifies the terminal 20 (idle / inactive mode UE) of the availability of the TRS / CSI-RS (information indicating whether the TRS / CSI-RS is available). The terminal 20 can determine whether the TRS / CSI-RS is transmitted from the base station 10 based on the received availability information. Therefore, when the TRS / CSI-RS is transmitted from the base station 10, the terminal 20 can perform paging monitoring in the PO using the TRS / CSI-RS according to the operation shown in Figure 4 to perform paging monitoring in the PO using the TRS / CSI-RS.

[0062] In addition, the notification of the availability of the TRS / CSI-RS can be replaced with the notification of the activation / deactivation of the TRS / CSI-RS. Hereinafter, as more specific examples, Example 1-1 and Example 1-2 will be described.

[0063] <Example 1-1>

[0064] In Example 1-1, the base station 10 notifies the terminal 20 in advance of the information required for receiving the TRS / CSI-RS (e.g., time-frequency resource location, beam (QCL) information, etc.) using high-layer signaling. The high-layer signaling is, for example, system information (SIB1, SIB2, etc.), RRC signaling received in the connected mode, etc.

[0065] On this basis, the base station 10 notifies the terminal 10 of the availability of the TRS / CSI-RS using low-layer signaling. The low-layer signaling is, for example, DCI, MAC CE, reference signals, etc.

[0066] Referring to Figure 5 , an operation example of Example 1-1 will be described. In S101, the base station 10 transmits the above-mentioned information required for receiving the TRS / CSI-RS to the terminal 20 (idle / inactive mode UE) using high-layer signaling, and the terminal 20 receives the information.

[0067] In addition, regarding S101, it can be executed when the terminal 20 is in the RRC connected mode, or it can also be executed when the terminal 20 is in the idle / inactive mode. In the case of executing S101 for the terminal 20 in the idle / inactive mode, for example, the base station 10 sends this information at the timing when the terminal 20 wakes up intermittently, and the terminal 20 receives this information at this timing. This timing can be the timing of the PO or a timing other than the PO. The same applies to the high-layer signaling (or semi-static signaling) described below.

[0068] In S102, the base station 10 uses low-layer signaling (L1 / L2 signaling) to send information indicating that TRS / CSI-RS is available (i.e., the base station 10 sends TRS / CSI-RS) to the terminal 20, and the terminal 20 receives this information.

[0069] It is assumed that S102 is executed for the terminal 20 in the idle / inactive mode. For example, the base station 10 sends this information at the timing when the terminal 20 wakes up intermittently, and the terminal 20 receives this information at this timing. This timing can be the timing of the PO or a timing other than the PO. The same applies to the low-layer signaling or dynamic signaling described below.

[0070] The terminal 20 can use the information received in S102 to determine that TRS / CSI-RS has been sent from the base station 10, and thus, according to the information received in S101, uses TRS / CSI-RS to perform paging monitoring in the PO. That is, for example, the terminal 20 performs Figure 4 the actions shown.

[0071] In S103, the base station 10 uses low-layer signaling (L1 / L2 signaling) to send information indicating that TRS / CSI-RS is unavailable (i.e., the base station 10 has stopped sending TRS / CSI-RS) to the terminal 20, and the terminal 20 receives this information.

[0072] The terminal 20 can use the information received in S103 to determine that TRS / CSI-RS has not been sent from the base station 10, and thus does not use TRS / CSI-RS to perform paging monitoring in the PO. That is, for example, the terminal 20 performs Figure 3 the actions shown.

[0073] In addition, in Embodiment 1-1, high-layer signaling may not be performed through S101. In this case, for example, information required for TRS / CSI-RS reception (e.g., time-frequency resource location, beam (QCL) information, etc.) is specified by standards or the like and is pre-held by the terminal 20 and the base station 10. The terminal 20 can use this information to receive TRS / CSI-RS.

[0074] <Embodiment 1-2>

[0075] In Embodiment 1-2, the base station 10 notifies the terminal 10 of the availability of TRS / CSI-RS using high-layer signaling.

[0076] In Embodiment 1-2, regarding information required for TRS / CSI-RS reception (e.g., time-frequency resource location, beam (QCL) information, etc.), for example, it is specified by standards or the like and is pre-held by the terminal 20 and the base station 10. The terminal 20 can use this information to receive TRS / CSI-RS.

[0077] Alternatively, regarding information required for TRS / CSI-RS reception (e.g., time-frequency resource location, beam (QCL) information, etc.), it may be notified from the base station 10 to the terminal 20 together with the information on the availability of TRS / CSI-RS.

[0078] Refer to Figure 6 to describe the operation example of Embodiment 1-2. In Figure 6 the example shown, it is assumed that the information required for TRS / CSI-RS reception is information pre-held in the terminal 20 and the base station 10.

[0079] In S111, the base station 10 uses high-layer signaling to send information indicating that TRS / CSI-RS is available (i.e., the base station 10 sends TRS / CSI-RS) to the terminal 20, and the terminal 20 receives this information.

[0080] The terminal 20 can determine, based on the information received in S111, that TRS / CSI-RS is sent from the base station 10. Therefore, according to the information held, the terminal 20 uses TRS / CSI-RS to perform paging monitoring in the PO. That is, for example, the terminal 20 performs Figure 4 the operation shown.

[0081] In S112, the base station 10 uses high-layer signaling to send information indicating that TRS / CSI-RS is unavailable (i.e., the base station 10 has stopped sending TRS / CSI-RS) to the terminal 20, and the terminal 20 receives this information.

[0082] The terminal 20 can use the information received in S112 to determine that the TRS / CSI-RS has not been sent from the base station 10, and thus does not use the TRS / CSI-RS for paging monitoring in the PO. That is, for example, the terminal 20 performs Figure 3 the actions shown.

[0083] According to Embodiment 1, the terminal 20 can determine whether the TRS / CSI-RS can be used during paging monitoring, so that the power consumption of the terminal 20 can be reduced.

[0084] (Embodiment 2)

[0085] Next, Embodiment 2 will be described. In Embodiment 2, the base station 10 notifies the terminal 20 (idle / inactive mode UE) of the availability of the TRS / CSI-RS (information on whether the TRS / CSI-RS is available) in 1 slot. "1 slot" means one signaling. The notification of the availability of the TRS / CSI-RS can be performed through high-layer signaling or low-layer signaling.

[0086] In Embodiment 2, the correspondence between the notification of the availability of the TRS / CSI-RS and the PO is specified or notified. Using this correspondence, the terminal 20 receives the notification of the availability of the TRS / CSI-RS, and thus can determine whether the TRS / CSI-RS can be used for paging monitoring in the PO corresponding to this notification.

[0087] In addition, in Embodiment 2, the default action of the terminal 20 (for example, whether it is conceivable that the UE uses the TRS / CSI-RS) when the notification of the availability of the TRS / CSI-RS corresponding to a certain PO is not received can be notified or specified. The following will describe more specific examples of Embodiment 2 as Embodiment 2-1 and Embodiment 2-2.

[0088] <Embodiment 2-1>

[0089] In Embodiment 2-1, for each availability of the TRS / CSI-RS corresponding to one PO, the base station 10 notifies the terminal 20 in 1 slot. Refer to Figure 7 、 Figure 8 to describe the example.

[0090] In Figure 7 、 Figure 8In any case, regarding the information required for TRS / CSI-RS reception (e.g., time-frequency resource location, beam (QCL) information, etc.), for example, it can be specified by a standard or the like and pre-held by the terminal 20 and the base station 10, or it can be notified in advance from the base station 10 to the terminal 20 by high-layer signaling. In addition, this information can be notified together with the notification of the availability of the TRS / CSI-RS.

[0091] In addition, regarding the correspondence relationship between the above-mentioned notification of the availability of the TRS / CSI-RS and the PO, for example, it can be specified by a standard or the like and pre-held by the terminal 20 and the base station 10, or it can be notified in advance from the base station 10 to the terminal 20 by high-layer signaling. In addition, the information indicating this correspondence relationship can be notified together with the notification of the availability of the TRS / CSI-RS.

[0092] In addition, regarding the above-mentioned default action, for example, it can be specified by a standard or the like and pre-held by the terminal 20 and the base station 10, or it can be notified in advance from the base station 10 to the terminal 20 by high-layer signaling. In addition, the information indicating this default action can be notified together with the notification of the availability of the TRS / CSI-RS.

[0093] Regarding the information required for TRS / CSI-RS reception, the correspondence relationship, and the information of the default action, they can be notified in advance from the base station 10 to the terminal 20 together by high-layer signaling.

[0094] First, an example shown in Figure 7 will be described. In S201, the base station 10 sends information indicating the availability of the TRS / CSI-RS to the terminal 20, and the terminal 20 receives this information.

[0095] In Figure 7 the example, the "correspondence relationship" is a relationship such as "the notification of the availability of the TRS / CSI-RS corresponds to the PO from this notification to the next notification of the availability of the TRS / CSI-RS". In Figure 7 as an example, it is assumed that there is basically one PO between notifications.

[0096] Therefore, when the terminal 20 receives the notification in S201, it determines that for paging monitoring in PO#1, it can utilize the TRS / CSI-RS during the period from after the notification in S201 to before PO#1. That is, it determines that the base station 10 transmits TRS / CSI-RS during this period. Therefore, when the terminal 20 receives the notification in S201, it utilizes the TRS / CSI-RS during the period from after the notification in S201 to before PO#1 to perform paging monitoring in PO#1.

[0097] The same applies to the reception of the notification in S202 and the paging monitoring of PO#2.

[0098] 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 does not utilize the TRS / CSI-RS. That is, for example, through Figure 3 the actions shown, it performs paging monitoring in PO#3. The same applies to S204 and PO#5.

[0099] After S203, the terminal 20 does not receive the notification of the availability of TRS / CSI-RS at the timing when it should receive it. This can be a case where the base station 10 does not send the notification, or a case where the base station 10 sends the notification, but the terminal 20 cannot receive the notification due to poor radio quality.

[0100] When the default action in the case of not receiving the notification of the availability of TRS / CSI-RS at the timing when it should be received is set to "utilize TRS / CSI-RS", the terminal 20 utilizes the TRS / CSI-RS to perform paging monitoring in PO#4. When the default action in the case of not receiving the notification of the availability of TRS / CSI-RS at the timing when it should be received is set to "do not utilize TRS / CSI-RS", the terminal 20 does not utilize the TRS / CSI-RS to perform paging monitoring in PO#4 (for example Figure 3 the actions).

[0101] Next, an example shown in Figure 8 is 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.

[0102] In Figure 8In the example of , the "corresponding relationship" is a corresponding relationship where "the notification of the availability of TRS / CSI-RS corresponds to the PO from the next notification after this notification until the next notification after that".

[0103] Therefore, when the terminal 20 receives the notification in S211, it determines that it can use TRS / CSI-RS to perform paging monitoring in PO#2. Therefore, the terminal 20 uses TRS / CSI-RS to perform paging monitoring in PO#2. In addition, regarding the paging monitoring of PO#1, it determines the availability of TRS / CSI-RS based on the previous notification.

[0104] The same applies to the reception of the notification in S212 and the paging monitoring of PO#3.

[0105] In S213, the base station 10 sends 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 does not use TRS / CSI-RS. That is, for example, through the Figure 3 shown actions, it performs paging monitoring in PO#4. The same applies to S214 and subsequent POs.

[0106] After S213, the terminal 20 does not receive the notification of the availability of TRS / CSI-RS at the timing when it should receive it. This can be a case where the base station 10 does not send the notification, or a case where the base station 10 sends the notification but the terminal 20 cannot receive it due to poor radio quality.

[0107] When the default action in the case of not receiving the notification of the availability of TRS / CSI-RS at the timing when it should be received is set to "use TRS / CSI-RS", the terminal 20 uses TRS / CSI-RS to perform paging monitoring in PO#5. When the default action in the case of not receiving the notification of the availability of TRS / CSI-RS at the timing when it should be received is set to "do not use TRS / CSI-RS", the terminal 20 does not use TRS / CSI-RS to perform paging monitoring in PO#5 (for example Figure 3 actions).

[0108] In addition, as explained with reference to Figure 7 , Figure 8 the corresponding relationship where there is a corresponding PO between notifications is an example. In addition to this corresponding relationship, the direct corresponding relationship between the PO and the notification can be specified or notified.

[0109] This corresponding relationship can be, for example, a corresponding relationship that associates one PO with one notification (e.g., PO#1 - Notification#1, PO#2 - Notification#2,...). When this example is used for Figure 7 the example of, for example, the notification in S201 may contain information specifying PO#1, and the notification in S202 may contain information specifying PO#2.

[0110] As described above, the notification may contain information explicitly specifying the PO, or may not contain information explicitly specifying the PO. In the case where the notification does not contain information explicitly specifying the PO, the resource (time resource, frequency resource, or time-frequency resource) for sending the notification may be associated with the PO.

[0111] <Regarding the relationship between the notification and TRS / CSI-RS>

[0112] Regarding the notification of the availability of TRS / CSI-RS corresponding to a PO, for example, during the process of corresponding to a PO, the availability of multiple TRS / CSI-RS corresponding to multiple beams may be summarized and notified.

[0113] In this case, for example, when during the period between the notification of S201 in Figure 7 and PO#1, TRS / CSI-RS is transmitted twice respectively through each of the beams 1 to 4, the terminal 20 can determine that any of the TRS / CSI-RS transmitted twice in each of the beams 1 to 4 has been transmitted, so the terminal 20 can use any of these TRS / CSI-RS.

[0114] In addition, regarding the notification of the availability of TRS / CSI-RS corresponding to a PO, for example, during the process of corresponding to a PO, it may correspond to the TRS / CSI-RS of one beam. In this case, the availability of multiple TRS / CSI-RS repeatedly transmitted through this one beam may be summarized and notified.

[0115] In this case, in the notification of S201 in Figure 7 for example, regarding PO#1, the notification indicates information that "the TRS / CSI-RS of beam 1 can be utilized". When TRS / CSI-RS is transmitted four times through beam 1 during the period between the notification and PO#1, the terminal 20 can determine that any of the TRS / CSI-RS transmitted four times through beam 1 has been transmitted, so the terminal 20 can use any of these TRS / CSI-RS of beam 1.

[0116] <Example 2-2>

[0117] Next, Example 2-2 will be described. In Example 2-2, in each 1 time slot in which TRS / CSI-RS is transmitted, the availability of TRS / CSI-RS is notified.

[0118] Refer to Figure 9 for an illustration of the example. 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 transmitted first after this notification. Therefore, the terminal 20 can utilize the TRS / CSI-RS transmitted in S222 for paging monitoring in PO#1. The same applies to S223 and S224.

[0119] 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 utilize TRS / CSI-RS for paging monitoring in PO#2. Therefore, in the same manner as Figure 3 the operation, the terminal 20 utilizes the SSB for paging monitoring in PO#2.

[0120] In addition, it is an example that the notification of the availability of TRS / CSI-RS corresponds to the TRS / CSI-RS transmitted first after this notification. This notification may also correspond to a TRS / CSI-RS other than the TRS / CSI-RS transmitted first after this notification. For example, it can be a process such as Notification #1 → Notification #2 → TRS#1 → TRS#2. In this case, for example, Notification #1 indicating that TRS#1 is available is transmitted from the base station 10, and then Notification #2 indicating that TRS#2 is available is transmitted. The terminal 20 determines that TRS#1 corresponding to Notification #1 and TRS#2 corresponding to Notification #2 are available by receiving these notifications. If the PO is immediately behind TRS#2, the terminal 20 can utilize TRS#1 and TRS#2 received after Notification #2 for paging monitoring in the PO.

[0121] According to Example 2, the terminal 20 can determine whether it can utilize TRS / CSI-RS during paging monitoring, so the power consumption of the terminal 20 can be reduced. In addition, in Example 2, the availability of TRS / CSI-RS can be controlled with a finer granularity.

[0122] (Example 3)

[0123] Next, Example 3 will be described. In Example 3, 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 can be carried out through high-layer signaling or through low-layer signaling.

[0124] In Example 3, the default action of the terminal 20 in the case where the availability of TRS / CSI-RS is not notified can be notified or specified (for example, whether it is conceivable that the UE uses TRS / CSI-RS).

[0125] In Example 3, regarding the information required for receiving TRS / CSI-RS (such as time-frequency resource location, beam (QCL) information, etc.), for example, it can also be specified by a standard or the like and pre-held by the terminal 20 and the base station 10. Similar to the Figure 5 example shown, it can also be notified in advance from the base station 10 to the terminal 20 through high-layer signaling. In addition, this information can be notified together with the notification of the availability of TRS / CSI-RS.

[0126] In addition, regarding the above-mentioned default action, for example, it can be specified by a standard or the like and pre-held by the terminal 20 and the base station 10, or it can be notified in advance from the base station 10 to the terminal 20 through high-layer signaling. In addition, this information can be notified together with the notification of the availability of TRS / CSI-RS.

[0127] The information required for receiving TRS / CSI-RS and the information on the default action can be notified in advance from the base station 10 to the terminal 20 together with the notification of the availability of TRS / CSI-RS.

[0128] More specific examples of Example 3 will be described below as Example 3-1 and Example 3-2.

[0129] <Example 3-1>

[0130] In Example 3-1, the actions of the previous notification are applied until the switch of the availability of TRS / CSI-RS is notified.

[0131] Refer to Figure 10A more specific description is given for Embodiment 3-1. In S301, the base station 10 sends an activation (availability notification) of TRS / CSI-RS to the terminal 20. The terminal 20 receives this activation. In S302, the base station 10 sends a deactivation (unavailability notification) of TRS / CSI-RS to the terminal 20. The terminal 20 receives this deactivation.

[0132] The terminal 20 is assumed to be able to use TRS / CSI-RS to perform paging monitoring in the PO during the period from receiving the activation in S301 to receiving the deactivation in S302. Therefore, during this period, if there is a PO, TRS / CSI-RS is used to perform paging monitoring in this PO.

[0133] In S302, the base station 10 sends a deactivation (unavailability notification) of TRS / CSI-RS to the terminal 20. The terminal 20 receives this deactivation. In S303, the base station 10 sends an activation (availability notification) of TRS / CSI-RS to the terminal 20. The terminal 20 receives this activation.

[0134] The terminal 20 is assumed to be unable to use TRS / CSI-RS to perform paging monitoring in the PO during the period from receiving the deactivation in S302 to receiving the activation in S303. Therefore, during this period, even if there is a PO, TRS / CSI-RS is not used to perform paging monitoring in the PO.

[0135] <Embodiment 3-2>

[0136] In Embodiment 3-2, when the availability of TRS / CSI-RS is not notified within a certain period, the availability of TRS / CSI-RS is switched according to the status of the last notification. A timer is used, for example, in the measurement of the certain period. For example, when the terminal 20 is notified of the activation of TRS / CSI-RS and during the period of the timer, if the activation or deactivation of TRS / CSI-RS is not notified, the status is switched and TRS / CSI-RS is set to deactivation (unavailable).

[0137] Regarding the value of the timer, for example, it can be specified by a standard or the like and pre-held by the terminal 20 and the base station 10, or can be notified in advance from the base station 10 to the terminal 20 through higher-layer signaling or the like. In addition, the value of the timer can be notified together with the activation or deactivation of the TRS / CSI-RS.

[0138] Refer to Figure 11 A more specific description of Embodiment 3-2 will be given. In S311, the base station 10 sends the activation (availability notification) of the TRS / CSI-RS to the terminal 20. The terminal 20 receives this activation and starts the timer.

[0139] In S311, before the expiration of the timer, when the terminal 20 receives the activation of the TRS / CSI-RS from the base station 10, the timer is restarted (reset and started).

[0140] After that, neither activation nor deactivation is received, and the timer expires in S313. During the period from S311 to S313, the terminal 20 can utilize the TRS / CSI-RS.

[0141] In S313, the terminal 20 switches the availability status of the TRS / CSI-RS from activation to deactivation. In S314, the terminal 20 receives the activation of the TRS / CSI-RS from the base station 20. During the period from S313 to S314, the terminal 20 assumes that it cannot utilize the TRS / CSI-RS. After S314, until the timer expires (or until deactivation is received), the terminal 20 assumes that it can utilize the TRS / CSI-RS.

[0142] According to Embodiment 3, the terminal 20 can determine whether it can utilize the TRS / CSI-RS during the paging monitoring process, so the power consumption of the terminal 20 can be reduced. In addition, in Embodiment 3, control using a timer can be performed, so signaling can be reduced.

[0143] (Embodiment 4)

[0144] Next, Embodiment 4 will be described. Embodiment 4 can be applied to any of Embodiments 1 to 3.

[0145] In Embodiment 4, the base station 10 notifies the terminal 20 of the period or number of times during which the availability of the TRS / CSI-RS is applied. The availability of the TRS / CSI-RS can be either the ability to use the TRS / CSI-RS or the inability to use the TRS / CSI-RS.

[0146] More specifically, the content of the notification is, for example, the period (X ms, Y slots, etc.) during which the availability of the TRS / CSI-RS is applied, the number of times (the number of TRS / CSI-RS occasions, the number of POs, etc.) it is applied, and so on.

[0147] Regarding the notification method, for example, the base station 10 notifies the terminal 20 in advance of the period or number of times during which the availability of the TRS / CSI-RS is applied through higher-layer signaling.

[0148] In addition, the base station 10 can also notify the terminal 20 of the period or number of times during which the TRS / CSI-RS availability is applied when notifying the availability of the TRS / CSI-RS. That is, in this case, the application period or number of times can be notified together when notifying the TRS / CSI-RS availability.

[0149] As an example, in Figure 5 S102, when the base station 10 notifies the terminal 20 of "Y slots" together with the notification indicating the availability of the TRS / CSI-RS, the terminal 20 uses the TRS / CSI-RS to perform paging monitoring in the POs during the period of Y slots starting from the time of S102.

[0150] According to Embodiment 4, the terminal 20 can determine whether it can use the TRS / CSI-RS during paging monitoring based on the number of times or the period, so the power consumption of the terminal 20 can be reduced.

[0151] (Device Structure)

[0152] Next, an example of the functional structures of the base station 10 and the terminal 20 that execute the processes and operations described so far will be described. The base station 10 and the terminal 20 include the functions of Embodiments 1 to 4 described above. However, the base station 10 and the terminal 20 may each only have the functions of any one of Embodiments 1 to 4.

[0153] <Base Station 10>

[0154] Figure 12 is a diagram showing an example of the functional structure of the base station 10. As Figure 12As shown, the base station 10 includes a transmission unit 110, a reception unit 120, a setting unit 130, and a control unit 140. Figure 12 The functional structure shown is only an example. As long as the operations involved in the embodiments of the present invention can be performed, the functional division and the names of the functional units can be arbitrary. The transmission unit 110 and the reception unit 120 may be referred to as a communication unit.

[0155] The transmission unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal wirelessly. The reception unit 120 includes a function of receiving various signals transmitted from the terminal 20 and obtaining, for example, higher layer information from the received signals. In addition, the transmission unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL data, etc. to the terminal 20. In addition, the transmission unit 110 transmits the notifications described in Embodiments 1 to 4 to the terminal 20.

[0156] 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 it out from the storage device as needed.

[0157] The control unit 140 performs, for example, resource allocation and overall control of the base station 10. In addition, the functional units related to signal transmission in the control unit 140 may be included in the transmission unit 110, and the functional units related to signal reception in the control unit 140 may be included in the reception unit 120. In addition, the transmission unit 110 and the reception unit 120 may be referred to as a transmitter and a receiver, respectively.

[0158] <Terminal 20>

[0159] Figure 13 is a diagram showing an example of the functional structure of the terminal 20. As Figure 13 shown, the terminal 20 includes a transmission unit 210, a reception unit 220, a setting unit 230, and a control unit 240. Figure 13 The functional structure shown is only an example. As long as the operations involved in the embodiments of the present invention can be performed, the functional division and the names of the functional units can be arbitrary. The transmission unit 210 and the reception unit 220 may also be referred to as a communication unit.

[0160] The transmission unit 210 generates a transmission signal based on transmission data and transmits the transmission signal wirelessly. The reception unit 220 receives various signals wirelessly and obtains a higher layer signal from the received physical layer signals.

[0161] The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220 in the storage device, and reads it out from the storage device as needed. In addition, the setting unit 230 also stores preset setting information. The content of the setting information is, for example, information received through high-layer signaling described in Embodiments 1 to 4.

[0162] The control unit 240 controls paging monitoring in the PO according to the information received from the base station 10. For example, it determines whether to use TRS / CSI-RS for paging monitoring in the PO. Additionally, the functional unit related to signal transmission in the control unit 240 can be included in the transmitting unit 210, and the functional unit related to signal reception in the control unit 240 can be included in the receiving unit 220. Furthermore, the transmitting unit 210 and the receiving unit 220 can be respectively referred to as a transmitter and a receiver.

[0163] According to the present embodiment, for example, at least one of the following terminal, base station, and paging method is provided.

[0164] (Item 1)

[0165] A terminal, wherein the terminal has:

[0166] A receiving unit that receives from the base station a notification indicating whether a reference signal can be used for paging monitoring in a paging occasion; and

[0167] A control unit that performs paging monitoring according to the notification.

[0168] (Item 2)

[0169] The terminal according to Item 1, wherein

[0170] The receiving unit receives information required for receiving the reference signal from the base station through high-layer signaling.

[0171] (Item 3)

[0172] The terminal according to Item 1 or Item 2, wherein

[0173] The notification is associated with the paging occasion, and in the case where the receiving unit does not receive the notification, the control unit performs a default action in the paging occasion corresponding to the notification.

[0174] (Item 4)

[0175] The terminal according to any one of Items 1 to 3, wherein

[0176] When the control unit receives a first notification indicating whether a reference signal can be used for paging monitoring at a paging occasion from the receiving unit, it starts a timer. If the timer expires before receiving a second notification, it switches the state of whether the reference signal based on the first notification is available.

[0177] (Item 5)

[0178] A base station, wherein the base station has:

[0179] A control unit that controls whether to transmit a reference signal; and

[0180] A transmitting unit that sends a notification to a terminal, the notification indicating whether the terminal can use a reference signal for paging monitoring at a paging occasion.

[0181] (Item 6)

[0182] A paging method executed by a terminal, wherein the paging method has the following steps:

[0183] Receiving a notification from a base station, the notification indicating whether a reference signal can be used for paging monitoring at a paging occasion; and

[0184] Performing paging monitoring according to the notification.

[0185] According to any one of Items 1 to 6, power consumption of the terminal can be reduced during paging monitoring.

[0186] (Hardware Structure)

[0187] In the block diagrams used in the description of the above embodiments ( Figure 12 and Figure 13 ) show blocks in terms of functions. These functional blocks (structural parts) are implemented by any combination of at least one of hardware and software. In addition, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented by using a single device physically or logically combined, or two or more physically or logically separated devices can be directly or indirectly (e.g., using wired, wireless, etc.) connected and these multiple devices can be used to implement it. The functional block can also be implemented by combining software with the above single device or the above multiple devices.

[0188] Functionally, it has judgment, decision-making, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, establishment, comparison, assumption, expectation, regarded as, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), assigning, etc., but is not limited to these. For example, a functional block (structural part) that enables transmission to function is called a transmitting unit or a transmitter. In short, as described above, there is no particular limitation on the implementation method.

[0189] For example, the base station 10, the terminal 20, etc. in one embodiment of the present disclosure can also function as a computer that processes the wireless communication method of the present disclosure. Figure 14 FIG. is an example showing the hardware structure of the base station 10 and the terminal 20 according to one embodiment of the present disclosure. The above-mentioned base station 10 and terminal 20 can also be configured as a computer device physically 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, and a bus 1007, etc.

[0190] In addition, in the following description, the term "device" can be replaced with "circuit", "equipment", "unit", etc. The hardware structure of the base station 10 and the terminal 20 can be configured to include one or more devices shown in the drawings, or can also be configured not to include some devices.

[0191] Each function in the base station 10 and the terminal 20 is realized by the following method: a predetermined software (program) is read into hardware such as the processor 1001 and the storage device 1002, so that the processor 1001 performs operations and controls at least one of the communication of the communication device 1004 or the reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.

[0192] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 can also be composed of a central processing unit (CPU: Central Processing Unit) including an interface with peripheral devices, a control device, an arithmetic device, registers, etc. For example, the above-mentioned control unit 140, control unit 240, etc. can also be implemented by the processor 1001.

[0193] In addition, the processor 1001 reads out a program (program code), software module, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and performs various processes accordingly. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments is used. For example, Figure 12 The control unit 140 of the base station 10 shown can also be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. In addition, for example, Figure 13 The control unit 240 of the terminal 20 shown can also be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Regarding the above-described various processes, although it has been described that the above-described various processes are executed by one processor 1001, the above-described various processes can also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 can also be installed by one or more chips. In addition, the program can also be sent from a network via a telecommunication line.

[0194] The storage device 1002 is a computer-readable recording medium, and can be constituted by at least one of, for example, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), a RAM (Random Access Memory), etc. The storage device 1002 can also be referred to as a register, a cache, a main memory (main storage device), etc. The storage device 1002 can store a program (program code), a software module, etc. that can be executed in order to implement the communication method according to an embodiment of the present disclosure.

[0195] The auxiliary storage device 1003 is a computer-readable recording medium, and can be constituted by at least one of, for example, an optical disc such as a CD-ROM (Compact Disc ROM), a hard disk drive, a floppy disk, a magneto-optical disc (for example, a compact disc, a digital versatile disc, a Blu-ray (registered trademark) disc, a smart card, a flash memory (for example, a card, a stick, a key drive (Key drive)), a Floppy (registered trademark) disk, a magnetic stripe, etc. The auxiliary storage device 1003 can also be referred to as an auxiliary storage device. The above-described storage medium can be, for example, a database, a server, or other appropriate medium including at least one of the storage device 1002 and the auxiliary storage device 1003.

[0196] The communication device 1004 is hardware (a transceiver device) for communication between computers via at least one of a wired network and a wireless network. For example, it can also be called a network device, a network controller, a network card, a communication module, etc. The communication device 1004, for example, in order to implement at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex), can also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, a transceiver antenna, an amplifier unit, a transceiver unit, a transmission path interface, etc. can also be implemented by the communication device 1004. For the transceiver unit, physical or logical separate installation can be performed in the transmission unit and the reception unit.

[0197] 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. In addition, the input device 1005 and the output device 1006 can also be integrally formed (e.g., a touch panel).

[0198] 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 can be constituted by a single bus, or can be constituted by different buses for each device pair.

[0199] In addition, the base station 10 and the terminal 20 can be configured to include hardware such as a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit: application-specific integrated circuit), a PLD (Programmable Logic Device: programmable logic device), an FPGA (Field Programmable Gate Array: field programmable gate array), etc., and a part or all of each functional block can also be implemented by this hardware. For example, the processor 1001 can also be installed using at least one of these hardwares.

[0200] (Supplement of the Embodiment)

[0201] The embodiments of the present invention have been described above, but the disclosed invention is not limited to such embodiments. Those of ordinary skill in the art should understand various variations, modifications, substitution examples, replacement examples, etc. Specific numerical examples have been used for the purpose of facilitating the understanding of the invention, but these numerical values are only examples and any appropriate arbitrary values can be used as long as not specifically indicated. The distinction of items in the above description is not essential for the present invention. The matters described in two or more items can be combined as needed, or the matters described in one item can be applied to the matters described in other items (as long as there is no contradiction). The boundaries of the functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical components. The operations of multiple functional units can be physically performed by one component, or the operation of one functional unit can be physically performed by multiple components. Regarding the processing procedures described in the embodiments, the order of processing can be swapped without contradiction. For the convenience of explaining the processing, the base station 10 and the terminal 20 are described using functional block diagrams, but such devices can also be implemented in hardware, software, or a combination thereof. The software that operates through the processor of the base station 10 according to the embodiments of the present invention and the software that operates through the processor of the terminal 20 according to the embodiments of the present invention can also be stored in a random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, register, hard disk drive (HDD), removable disk, CD-ROM, database, server, and other appropriate arbitrary storage media respectively.

[0202] In addition, the notification of information is not limited to the forms / embodiments described in the present disclosure, and other methods can also be used. For example, the notification of information can be implemented through physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), high layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block))), other signals, or a combination thereof. In addition, the RRC signaling can also be referred to as an RRC message. For example, it can also be an RRC connection setup message, an RRC connection reconfiguration message, etc.

[0203] Each form / embodiment described in the present disclosure can also be applied to at least one of LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA 2000, UMB (UltraMobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), systems using other appropriate systems, and next-generation systems extended therefrom. In addition, multiple systems (for example, a combination of at least one of LTE and LTE-A and 5G, etc.) can also be combined and applied.

[0204] For the processing procedures, timings, flows, etc. of each form / embodiment described in this specification, the order can be changed without contradiction. For example, for the methods described in the present disclosure, the order of illustration indicates the elements of various steps, but is not limited to the specific order indicated.

[0205] In this specification, specific actions performed by the base station 10 may be performed by its upper node according to circumstances. In a network composed of one or more network nodes having the base station 10, it is obvious that various actions performed for communicating with the terminal 20 can be performed by at least one of the base station 10 and other network nodes other than the base station 10 (for example, MME or S-GW, etc. are considered, but not limited to these). In the above, the case where there is one other network node other than the base station 10 is illustrated, but the other network nodes may also be a combination of multiple other network nodes (for example, MME and S-GW).

[0206] The information, signals, etc. described in the present disclosure can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It can also be input or output via multiple network nodes.

[0207] The information input or output, etc. can be stored in a specific location (e.g., memory), or can be managed using a management table. The information input or output, etc. can be rewritten, updated, or appended. The information output, etc. can also be deleted. The information input, etc. can also be sent to other devices.

[0208] The determination in the present disclosure can be made by a value represented by 1 bit (0 or 1), can also be made by a Boolean value (true or false), and can also be made by a numerical comparison (e.g., comparison with a predetermined value).

[0209] For software, no matter it is called software, firmware, middleware, microcode, hardware description language, or by other names, it should be broadly interpreted as referring to commands, command sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, processes, functions, etc.

[0210] In addition, software, commands, information, etc. can be transmitted and received via a transmission medium. For example, when using at least one of wired technologies (coaxial cables, fiber optic cables, twisted pairs, digital subscriber lines (DSL), etc.) and wireless technologies (infrared rays, microwaves, etc.) to send software from a web page, server, or other remote source, at least one of these wired and wireless technologies is included in the definition of the transmission medium.

[0211] The information, signals, etc. described in the present disclosure can also be represented using any one of a variety of different technologies. For example, the data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be involved in the above description as a whole can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination of these.

[0212] In addition, the terms described in the present disclosure and the terms required to understand the present disclosure can be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol can also be a signal (signaling). In addition, a signal can also be a message. Additionally, a component carrier (CC) can be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0213] Terms such as "system" and "network" used in the present disclosure can be used interchangeably.

[0214] In addition, the information, parameters, etc. described in this disclosure can be represented by absolute values, relative values with respect to a predetermined value, or other corresponding information. For example, radio resources can also be indicated by indices.

[0215] The names used for the above parameters are non - restrictive in any aspect. Furthermore, mathematical expressions using these parameters are sometimes different from the content explicitly shown in this disclosure. Various channels (such as PUSCH, PUCCH, PDCCH, etc.) and information elements can be identified by appropriate names. Therefore, the various names assigned to these various channels and information elements are non - restrictive in any aspect.

[0216] In this disclosure, terms such as "base station (BS: Base Station)", "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. can be used interchangeably. Sometimes, base stations are also referred to as macro cells, small cells, femto cells, pico cells, etc.

[0217] 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 also be provided with communication services by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). Terms such as "cell" or "sector" refer to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services within that coverage range.

[0218] In this disclosure, terms such as "mobile station (MS: Mobile Station)", "terminal (user terminal)", "terminal (UE: User Equipment)", "terminal", etc. can be used interchangeably.

[0219] For mobile stations, those skilled in the art sometimes also use the following terms to refer to them: subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals, handsets, user agents, mobile clients, clients, or some other appropriate terms.

[0220] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a communication device, etc. In addition, at least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., an automobile, an airplane, etc.), a moving body that moves in an unmanned manner (e.g., a drone, a self-driving car, etc.), or a robot (humanoid or non-humanoid). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during a 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.

[0221] In addition, the base station in the present disclosure may also be replaced by a terminal. For example, regarding a structure in which communication between a base station and a terminal is replaced by communication between multiple terminals 20 (e.g., which may also be referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.), various forms / embodiments of the present disclosure may also be applied. In this case, it may also be configured such that the terminal 20 has the functions of the above-described base station 10. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to inter-terminal communication (e.g., "side"). For example, an uplink channel, a downlink channel, etc. may also be replaced by a side channel.

[0222] Similarly, the terminal in the present disclosure may be replaced by a base station. In this case, it may also be configured such that the base station has the functions of the above-described terminal.

[0223] As used in this disclosure, terms such as "determining" and "deciding" sometimes also cover situations involving a variety of actions. For example, "determining" and "deciding" may include cases where something that has been judged, calculated, computed, processed, derived, investigated, looked up / search / inquired (e.g., searched in a table, database, or other data structure), or ascertained is regarded as having been "determined" or "decided". In addition, "determining" and "deciding" may include cases where something that has been received (e.g., received information), transmitted (e.g., transmitted information), input, output, or accessed (e.g., accessed data in memory) is regarded as something "determined" or "decided". Further, "determining" and "deciding" may include cases where something that has been resolved, selected, chosen, established, compared, etc. is regarded as something "determined" or "decided". That is, "determining" and "deciding" may cover anything for which any action has been "determined" or "decided". Additionally, "determining (deciding)" may be replaced by "assuming", "expecting", or "considering".

[0224] The terms "connected" and "coupled" or any variations of these terms are intended to represent all direct or indirect connections or couplings between two or more elements, and may include cases where there is one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be a physical coupling or connection, a logical coupling or connection, or a combination of these. For example, "Access" can be used to replace "connected". In the context of this disclosure, for two elements, it can be considered that they are "connected" or "coupled" to each other by using at least one of one or more wires, cables, and printed electrical connections, and as some non-limiting and non-inclusive examples, by using electromagnetic energy such as electromagnetic energy having wavelengths in the radio frequency band, microwave region, and optical (including both visible and invisible) region.

[0225] A reference signal can be abbreviated as RS (Reference Signal), or can be called a pilot according to the applied standard.

[0226] In the present disclosure, the description such as "according to" is not meant to be "only according to" unless otherwise clearly stated. In other words, the description "according to" means both "only according to" and "at least according to".

[0227] Any reference to elements using terms such as "first", "second", etc. used in the present disclosure does not entirely limit the quantity and order of these elements. These terms are used in the present disclosure as a simple method for distinguishing between two or more elements. Therefore, the reference to the first and second elements does not mean that only two elements can be adopted here or that the first element must precede the second element in any form.

[0228] The "unit" in the above-mentioned device structures can be replaced with "section", "circuit", "equipment", etc.

[0229] When the terms "include", "including" and their variants are used in the present disclosure, these terms mean inclusive in the same way as the term "comprising". Also, the term "or" used in the present disclosure does not mean exclusive or.

[0230] A radio frame can be composed of one or more frames in the time domain. One or more frames in the time domain can also be called sub-frames. A sub-frame can also be composed of one or more time slots in the time domain. A sub-frame can be a fixed time length (e.g., 1 ms) independent of the numerology.

[0231] The numerology can also be communication parameters applied to at least one of transmission and reception of a certain signal or channel. The numerology can represent, for example, at least one of subcarrier spacing (SCS: SubCarrier Spacing), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI: Transmission Time Interval), number of symbols per TTI, radio frame structure, specific filtering processing performed by a transceiver in the frequency domain, specific windowing processing performed by a transceiver in the time domain, etc.

[0232] A time slot can be composed of one or more symbols (such as OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. A time slot can be a time unit based on a parameter set.

[0233] A time slot can also contain multiple mini-slots. Each mini-slot can be composed of one or more symbols in the time domain. Additionally, a mini-slot can also be referred to as a sub-slot. A mini-slot can also be composed of fewer symbols than a time slot. The PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot can also be referred to as PDSCH (or PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using a mini-slot can also be referred to as PDSCH (or PUSCH) mapping type B.

[0234] A radio frame, a sub-frame, a time slot, a mini-slot, and a symbol all represent time units when transmitting signals. A radio frame, a sub-frame, a time slot, a mini-slot, and a symbol can also use their respective other names.

[0235] For example, 1 sub-frame can also be referred to as a Transmission Time Interval (TTI), multiple consecutive sub-frames can also be referred to as a TTI, 1 time slot or 1 mini-slot can also be referred to as a TTI. That is, at least one of a sub-frame and a TTI can be a sub-frame (1 ms) in the existing LTE, or a period shorter than 1 ms (e.g., 1 - 13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI can also not be a sub-frame, but be referred to as a time slot, a mini-slot, etc.

[0236] Here, a TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as the frequency domain width and transmission power that can be used in each terminal 20) to each terminal 20 in units of TTI. In addition, the definition of a TTI is not limited to this.

[0237] A TTI can be a transmission time unit for a data packet (transmission block), a code block, a codeword, etc. after channel coding, or a processing unit for scheduling, link adaptation, etc. In addition, when a TTI is assigned, the actual time interval (such as the number of symbols) to which a transmission block, a code block, a codeword, etc. are mapped can also be shorter than this TTI.

[0238] In addition, in the case where 1 time slot or 1 mini time slot is called a TTI, more than one TTI (i.e., more than one time slot or more than one mini time slot) can also constitute the minimum time unit for scheduling. Additionally, the number of time slots (number of mini time slots) that constitute the minimum time unit for this scheduling can also be controlled.

[0239] A TTI with a time length of 1 ms can be called a normal TTI (TTI in LTE Rel.8 - 12), a regular TTI, a long TTI, a normal subframe, a regular subframe, a long subframe, a time slot, etc. A TTI shorter than the normal TTI can be called a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini time slot, a sub - time slot, a time slot, etc.

[0240] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) can be replaced with a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) can also be replaced with a TTI having a TTI length less than that of the long TTI and 1 ms or more.

[0241] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain. In the frequency domain, it can also contain one or more consecutive subcarriers. The number of subcarriers included in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers included in an RB can be determined based on the parameter set.

[0242] In addition, the time domain of an RB can contain one or more symbols, and can also be the length of 1 time slot, 1 mini time slot, 1 subframe, or 1 TTI. 1 TTI, 1 subframe, etc. can also be composed of one or more resource blocks respectively.

[0243] In addition, one or more RBs can also be called a physical resource block (PRB), a sub - carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0244] In addition, a resource block can also be composed of one or more resource elements (RE). For example, 1 RE can also be a radio resource area of 1 subcarrier and 1 symbol.

[0245] A bandwidth part (BWP) (which may also be referred to as partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (RB) used by a certain parameter set in a certain carrier. Herein, the common RB may also be determined by the index of the RB based on the common reference point of the carrier. The PRB may also be defined by a certain BWP and numbered within that BWP.

[0246] The BWP may also include a UL BWP for UL use and a DL BWP for DL use. For a UE, one or more BWPs may be set within one carrier.

[0247] At least one of the set BWPs may be active, and the UE may not assume to transmit and receive a predetermined signal / channel outside the active BWP. In addition, in the present disclosure, "cell", "carrier", etc. may also be replaced with "BWP".

[0248] The structures of the above-mentioned radio frames, subframes, time slots, mini-slots, and symbols are merely illustrative. For example, the number of subframes included in a radio frame, the number of time slots per subframe or radio frame, the number of mini-slots included in a time slot, the number of symbols and RBs included in a time slot or mini-slot, the number of subcarriers included in an RB, and the number of symbols, symbol length, cyclic prefix (CP) length, etc. within a TTI can be variously changed.

[0249] In the present disclosure, for example, when articles are added through translation such as a, an, and the in English, the present disclosure also includes the case where the noun following these articles is in the plural form.

[0250] In the present disclosure, an expression such as "A and B are different" may also mean "A and B are different from each other". In addition, this expression may also mean "A and B are respectively different from C". Expressions such as "separate" and "combine" may be similarly interpreted as "different".

[0251] Each form / embodiment described in the present disclosure may be used alone, in combination, or switched according to execution. In addition, the notification of predetermined information is not limited to being explicitly (e.g., notification of "is X") carried out, and may also be implicitly (e.g., without notification of the predetermined information) carried out.

[0252] In addition, in the present disclosure, an SS block or CRI-RS is an example of a synchronization signal or a reference signal.

[0253] As described above, the present disclosure has been described in detail. However, for those skilled in the art, it should be clear that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented in the form of modifications and changes without departing from the gist and scope of the present disclosure determined by the claims. Therefore, the purpose of the description of the present disclosure is to illustrate, and it has no restrictive meaning for the present disclosure.

[0254] Reference numeral description:

[0255] 10 Base station

[0256] 110 Transmitter

[0257] 120 Receiver

[0258] 130 Setting unit

[0259] 140 Control unit

[0260] 20 Terminal

[0261] 210 Transmitter

[0262] 220 Receiver

[0263] 230 Setting unit

[0264] 240 Control unit

[0265] 1001 Processor

[0266] 1002 Storage device

[0267] 1003 Auxiliary storage device

[0268] 1004 Communication device

[0269] 1005 Input device

[0270] 1006 Output device

Claims

1. A terminal, wherein, the terminal has: a receiving unit that receives a notification and information from a base station, the notification indicating whether a reference signal can be used for paging monitoring in a paging occasion, and the information indicating a period during which the reference signal can be used; and a control unit that performs paging monitoring using the reference signal based on the notification and the period, the notification including information related to switching of whether the reference signal can be used.

2. A base station, wherein, the base station has: a control unit that determines whether a reference signal can be used for paging monitoring in a paging occasion and determines a period during which the reference signal can be used; and a transmitting unit that transmits a notification and information to a terminal, the notification indicating whether the reference signal can be used, and the information indicating a period during which the reference signal can be used, the notification including information related to switching of whether the reference signal can be used.

3. A communication system, wherein, the communication system has a terminal and a base station, the terminal has: a receiving unit that receives a notification and information from a base station, the notification indicating whether a reference signal can be used for paging monitoring in a paging occasion, and the information indicating a period during which the reference signal can be used; and a control unit that performs paging monitoring using the reference signal based on the notification and the period, the notification including information related to switching of whether the reference signal can be used, the base station has: a control unit that determines whether to transmit the reference signal and determines a period during which the reference signal can be used; and a transmitting unit that transmits a notification and information to a terminal, the notification indicating whether the reference signal can be used, and the information indicating a period during which the reference signal can be used.

4. A communication method, performed by a terminal, comprising the following steps: receiving a notification and information from a base station, the notification indicating whether a reference signal can be used for paging monitoring in a paging occasion, and the information indicating a period during which the reference signal can be used; and performing paging monitoring using the reference signal based on the notification and the period, the notification including information related to switching of whether the reference signal can be used.

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