Terminal and communication method

Abstract

A terminal is provided with: a reception unit that receives a notification from a base station constituting a non-terrestrial network (NTN); and a transmission unit that transmits a signal to the base station, and after the transmission unit has transmitted the signal to the base station, the reception unit receives information addressed from the base station to its own device, the notification being a signal that is received more easily than a normal downlink signal.

Description

TECHNICAL FIELD

[0001] The present application relates to a terminal and a communication method in a wireless communication system. BACKGROUND

[0002] In NR (New Radio) (also referred to as "5G") that is a successor system to LTE (Long Term Evolution), technologies satisfying a large capacity, a high-speed data transmission rate, a low latency, simultaneous connection of a plurality of terminals, a low cost, power saving, and the like, which are required conditions, are being researched (for example, Non-Patent Literature 1).

[0003] In addition, NTN (Non-Terrestrial Network) is now being researched. NTN uses a non-ground type network such as a satellite, and provides services to areas that cannot be covered in a ground type 5G network mainly in terms of cost (for example, Non-Patent Literature 2 and Non-Patent Literature 3).

[0004] PRIOR ART DOCUMENTS

[0005] NON-PATENT LITERATURE

[0006] Non-Patent Literature 1: 3GPP TS 38.300 V17.6.0 (2023-09)

[0007] Non-Patent Literature 2: 3GPP TR 38.821 V16.2.0 (2023-03)

[0008] Non-Patent Literature 3: KONISHI, "One Study on Downlink Frequency Sharing in HAPS Mobile Communication Systems", General Conference of the Institute of Electronics, Information and Communication Engineers, B-17-1, 2020 SUMMARY

[0009] PROBLEMS TO BE SOLVED BY THE INVENTION

[0010] In NTN, the distance between the base station in the sky and the terminal is very large, and the signal strength in the NLOS (Non Line of sight) environment is significantly reduced compared to the LOS (Line of sight) environment. Therefore, it can not be possible to receive important paging information in the NLOS environment.

[0011] The present application was completed in view of the above problems, and aims to improve reception performance in a wireless communication system in a case where the communication environment is not good.

[0012] MEANS FOR SOLVING THE PROBLEMS

[0013] According to the disclosed technology, a terminal is provided that has a reception section that receives a notification from a base station that constitutes a non-terrestrial network (NTN), and a transmission section that transmits a signal to the base station, and after the transmission section has transmitted the signal to the base station, the reception section receives information from the base station that is intended for the device itself, the notification being a signal that is easier to receive than a normal downlink signal.

[0014] Effects of Invention

[0015] According to the disclosed technology, in a wireless communication system, it is possible to improve reception performance in a poor communication environment. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a diagram showing an example (1) of an NTN.

[0017] Figure 2 is a diagram showing an example (2) of an NTN.

[0018] Figure 3 is a diagram showing an example (3) of an NTN.

[0019] Figure 4 is a diagram showing an example (4) of an NTN.

[0020] Figure 5 is a timing chart showing an example (1) of a notification in an NTN.

[0021] Figure 6 is a timing chart showing an example (2) of a notification in an NTN.

[0022] Figure 7 is a timing chart showing an example (3) of a notification in an NTN.

[0023] Figure 8 is a diagram showing an example of a functional structure of the base station 10 in the embodiment of the present application.

[0024] Figure 9 is a diagram showing an example of a functional structure of the terminal 20 in the embodiment of the present application.

[0025] Figure 10 is a diagram showing an example of a hardware structure of the base station 10 or the terminal 20 in the embodiment of the present application.

[0026] Figure 11 is a diagram showing an example of a structure of the vehicle 2001 in the embodiment of the present application. DETAILED DESCRIPTION

[0027] Embodiments of the present application will be described below with reference to the accompanying drawings. Note that the embodiments described below are merely examples, and the embodiments to which the present application is applied are not limited to the following embodiments.

[0028] In the operation of the wireless communication system of the embodiment of the present application, a prior art is appropriately used. Among them, the prior art is, for example, the existing LTE, but is not limited to the existing LTE. Further, unless otherwise specified, the term "LTE" used in this specification has a broad meaning including LTE-Advanced and beyond LTE-Advanced (e.g., NR).

[0029] Further, in the embodiment of the present application described below, the terms SS (Synchronization Signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), PUSCH (Physical Uplink Shared Channel) and the like used in the existing LTE are used. These are for ease of description, and the same signals, functions and the like can be referred to by other names. Further, the above terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, NR-PDCCH, NR-PDSCH, NR-PUCCH, NR-PUSCH and the like. However, even for signals for NR, it is not necessarily explicitly described as "NR-".

[0030] Further, in the embodiment of the present application, the duplex (Duplex) method can be a TDD (Time Division Duplex) method, or can be a FDD (Frequency Division Duplex) method, or can be a method other than these (for example, Flexible Duplex, etc.).

[0031] Further, in the embodiment of the present application, the "Configure" wireless parameters and the like can be pre-configured with predetermined values, or can be configured with wireless parameters notified from the base station 10 or the terminal 20.

[0032] Figure 1 is a diagram showing an example (1) of an NTN. The NTN (Non-Terrestrial Network) refers to a network that uses a device such as a satellite existing in a non-ground, and provides services to an area that cannot be covered in terms of cost in a terrestrial 5G network. In addition, by the NTN, it is possible to provide services with higher reliability. For example, it is assumed to be applied to IoT (Inter of things), ships, buses, trains, critical communications. In addition, the NTN has scalability based on efficient multicast or broadcast.

[0033] As an example of the NTN, as shown in Figure 1 , the satellite 10A can retransmit a signal transmitted from the ground base station 10B, and can provide services to an area where no ground base station is configured, such as a mountainous area.

[0034] In addition, the terrestrial 5G network can also be a structure as described below. The terrestrial 5G network includes one or more base stations 10 and terminals 20. 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 in 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. The base station 10 transmits a synchronization signal and system information to the terminal 20. The synchronization signal is, for example, NR-PSS and NR-SSS. The system information is transmitted, for example, by NR-PBCH, and is also called broadcast information.

[0035] The base station 10 transmits a control signal or data to the terminal 20 through DL (Downlink), and receives a control signal or data from the terminal 20 through UL (Uplink). Both the base station 10 and the terminal 20 can perform beamforming to perform transmission and reception of signals. In addition, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output) based communication to DL or UL. In addition, both the base station 10 and the terminal 20 can also communicate via SCell (Secondary Cell) and PCell (Primary Cell) based on CA (Carrier Aggregation).

[0036] The terminal 20 is a smartphone, a mobile phone, a tablet, a wearable terminal, a communication module for M2M (Machine-to-Machine), or the like, which has a wireless communication function. The terminal 20 receives a control signal or data from the base station 10 through DL, or transmits a control signal or data to the base station 10 through UL, thereby using various communication services provided by the wireless communication system.

[0037] Figure 2 is a diagram illustrating an example (2) of NTN. The area of each cell or beam in NTN is very wide compared to a terrestrial network (TN). Figure 2 An example of NTN configured by retransmission by a satellite is shown. The connection between the satellite 10A and the NTN gateway 10B is called a feeder link, and the connection between the satellite 10A and the UE 20 is called a service link.

[0038] As shown in Figure 2 , the delay difference between the near side UE 20A and the far side UE 20B is, for example, 10.3 ms in the case of GEO (Geosynchronous orbit), and 3.2 ms in the case of LEO (Low Earth orbit). In addition, the beam size in NTN is, for example, 3500 km in the case of GEO, and 1000 km in the case of LEO.

[0039] Figure 3 is a diagram illustrating an example (3) of NTN. As shown in Figure 3 , NTN is implemented by a satellite in space or a flying body in the air. The satellite of, for example, GEO can be a satellite located at a height of 35,786 km and having a geostationary orbit. The satellite of, for example, LEO can be a satellite located at a height of 500-2000 km and orbiting with a period of 88-127 minutes. For example, HAPS (High Altitude Platform Station) can be an aircraft located at a height of 8-50 km and performing a hovering flight.

[0040] As shown in Figure 3 , the GEO satellite, the LEO satellite, and the HAPS flying body can be connected to the ground station gNB via a gateway. In addition, the service area can also be larger in the order of HAPS, LEO, and GEO.

[0041] For example, by the NTN, it is possible to extend the coverage of the 5G network to non-service areas or service areas. Also for example, by the NTN, it is possible to improve the continuity, availability, and reliability of services in ships, buses, trains, or other important communications. Also, the case of NTN can be notified by transmitting dedicated parameters to the terminal 20, and the dedicated parameters can be, for example, parameters related to the decision of the TA (Timing Advance) based on satellite or flying body information.

[0042] Figure 4 Fig. 4 is a diagram illustrating an example of NTN. Figure 4 Fig. 4 is a diagram illustrating an example of NTN. Figure 4 As illustrated, a CN (Core Network) 10D, a gNB 10C, and a gateway 10B are connected to each other. The gateway 10B is connected to a satellite 10A via a feeder link. The satellite 10A is connected to a terminal 20A or a VSAT (Very small aperture terminal) 20B via a service link. NR Uu is established between the gNB 10C and the terminal 20A or the VSAT 20B.

[0043] Further, as an assumption of the network architecture of NTN, either FDD or TDD can be employed. Further, the cell on the ground can be fixed or mobile. Further, the terminal 20 can have a capability to support GNSS (Global Navigation Satellite System). For example, a power class 3 handheld device can also be assumed in FR1. Also, a VSAT device can be assumed at least in FR2.

[0044] Further, the network architecture of NTN can also assume a regenerative payload. For example, the gNB function can also be mounted on a satellite or an aircraft. Also, it can be that the gNB-DU is mounted on a satellite or a flying body, and the gNB-CU is configured as a ground station.

[0045] In the NTN (Non-Terrestrial Network), the signal strength can be reduced by about 18 dB in the NLOS (Non Line of sight) environment compared to the LOS (Line of sight) environment. Also, the probability of becoming NLOS is estimated to be about 10% in a suburban, rural environment, and about 50% in an urban environment.

[0046] Therefore, for example, a paging associated with transmission of important information such as ETWS (Earthquake and Tsunami Warning System), VoIP (Voice over Internet Protocol) can not be received in an NLOS environment. In addition, the paging can also be a signal to call the terminal in a case where a necessity of communication with the terminal is generated on the network side.

[0047] Therefore, in order to be able to perform paging reception, a notification channel or a notification signal can also be used as a signal to request a user to change a position to an LOS environment. For example, when a paging related to ETWS or VoIP or the like cannot be received in an NLOS environment, the user can move to a new position to receive the paging related to ETWS or VoIP or the like after receiving the notification. The structure of the notification channel or the notification signal and a procedure involved in the notification can also be determined.

[0048] The procedure or flow involved in the notification, the structure of the notification channel or the notification signal, and information transmitted by the notification are described. In addition, the embodiments of the present application are not limited to be applied to an NTN, and can also be applied to a general network or the like.

[0049] Figure 5 is a timing chart showing an example (1) of a notification in an NTN. In step S101, the BS 10 transmits a cell-common notification to the UE 20. In step S102, the UE 20 performs reception of the cell-common notification in a case where a condition is satisfied. A monitoring resource related to the reception can also be cell-common between UEs. The monitoring resource can be set per cell. In addition, cell-common can mean common between UEs within the same cell. The same applies hereinafter.

[0050] In step S103, the UE 20 transmits a specific channel or signal to the BS 10. In step S104, the BS 10 transmits information corresponding to the UE or information indicating no transmission data to the UE 20.

[0051] The condition in step S102 can be any one or a plurality of conditions shown in 1) to 4) below.

[0052] 1) A condition related to RSRP (Reference signal received power). For example, it can be that the UE 20 performs reception of the cell-common notification in a case where RSRP of SSB and / or CSI-RS is lower than an RSRP threshold value defined, set, or notified. In addition, the measurement of RSRP can be performed based on a signal other than SSB and / or CSI-RS. The same applies hereinafter.

[0053] 2) A condition related to setting or notification. For example, it can be that the UE 20 transmits the specific channel or signal to the BS 10 when the BS 10 sets or notifies the UE 20 to perform reception.

[0054] 3) A condition related to a timer. For example, it can be that the UE 20 transmits the specific channel or signal to the BS 10 when a timer expires. The timer can be initialized, started, or restarted when certain signals (e.g., a notification, a paging, an SIB, a PDCCH, etc.) are received.

[0055] 4) A condition related to reception. For example, it can be that the UE 20 transmits the specific channel or signal to the BS 10 in a case where reception of certain signals (e.g., a paging, an SIB, a PDCCH, etc.) fails continuously X times. A counter indicating the number of times of reception can be initialized to start counting again when certain signals (e.g., a notification, a paging, an SIB, a PDCCH, etc.) are received.

[0056] In addition, the condition is not limited to the above 1) to 4), and for example, it can be a condition related to a communication situation (e.g., a condition or notification related to LOS / NLOS or a condition or notification related to Doppler), and for example, it can be a condition related to an NTN (e.g., a condition related to an error of timing advance or a condition related to a UE position within a cell).

[0057] Further, in step S103, the UE 20 can transmit the specific channel or signal to the BS 10 when the UE 20 satisfies any one or more of the conditions shown in, for example, the following 1) to 4). In addition, in a case where the condition is satisfied, the channel situation can also be improved from before.

[0058] 1) A condition related to RSRP. For example, it can be that the UE 20 transmits the specific channel or signal to the BS 10 when the RSRP of an SSB and / or a CSI-RS is higher than an RSRP threshold value defined, set, or notified. The RSRP threshold value can be the same as the RSRP threshold value of the condition in step S102, or can be different.

[0059] 2) A condition related to setting or notification. For example, it can be that the UE 20 transmits the specific channel or signal to the BS 10 when the BS 10 sets or notifies the UE 20 to perform reception, i.e., when the UE 20 receives the setting or notification.

[0060] 3) A condition related to a timer. For example, it can be that the UE 20 transmits the specific channel or signal to the BS 10 when a timer is initialized and started upon reception of a notification in step S102, and when the timer expires.

[0061] 4) Condition related to reception. For example, it can be that, when some signal is successfully received (for example, when a notification, a paging, a SIB, a PDCCH, and the like is successfully received continuously X times), the UE 20 transmits the specific channel or signal to the BS 10.

[0062] The transmission of the specific channel or signal can be performed as shown in 1) or 2) below.

[0063] 1) For example, the UE 20 can transmit 1 bit of information indicating improvement of channel conditions for data reception via a periodic transmission opportunity (for example, a PRACH, a set PUCCH like an SR, a set PUSCH like a CG, and the like).

[0064] 2) For example, the UE 20 can also transmit a plurality of bits of information indicating channel conditions, UE speed, UE-ID (C-RNTI), and / or UE location via a PUCCH or PUSCH resource set or dynamically notified from the BS 10.

[0065] Further, any of the steps can not be performed, for example, step S103 can not be performed. In addition, any of the steps can be replaced with a different action, for example, step S103 can be replaced with the following action. When the notification common to the cell is transmitted or received, a timer can be initialized and started in the BS 10 and the UE 20. After the timer expires, the UE 20 can assume that it attempts to receive the corresponding information transmitted from the BS 10. The BS 10 can periodically transmit the information regardless of whether the UE 20 receives the information for ETWS, VoIP, paging, and the like.

[0066] Further, the on period and / or the sleep state of the DRX in the UE 20 can also be changed based on reception of the notification and the corresponding transmission and reception. In addition, the DRX can refer to discontinuous reception, and the sleep state can refer to the UE 20 not receiving a specific signal (for example, a PDCCH for data scheduling).

[0067] In addition, the information indicating no transmission data in step S104 can be 1 bit of information via a DCI field or a MAC-CE.

[0068] Figure 6 is a timing chart showing an example (2) of a notification in an NTN. In step S201, the BS 10 transmits a group-common notification to the UE 20. In step S202, the UE 20 receives the group-common notification in a case where a condition is satisfied. The monitoring resource related to the reception can be common to the cell or can be common to the group between UEs. The monitoring resource can be set per cell or per UE group. In addition, the group common can refer to being common between UEs in the same UE group in the same cell. The same applies below.

[0069] In step S203, the UE 20 transmits a specific channel or signal to the BS 10. In step S204, the BS 10 transmits information corresponding to the UE 20 or information indicating no transmission data to the UE 20.

[0070] The condition in step S202 can be any one or more of the following 1) - 4).

[0071] 1) A condition related to RSRP. For example, it can be that the UE 20 performs reception of the group-common announcement in a case where the RSRP of the SSB and / or the CSI-RS is lower than an RSRP threshold defined, set, or notified.

[0072] 2) A condition related to setting or notification. For example, it can be that the UE 20 performs reception of the group-common announcement when the BS 10 sets or notifies the UE 20 to perform reception.

[0073] 3) A condition related to a timer. For example, it can be that the UE 20 performs reception of the group-common announcement when a timer expires. The timer can be initialized, started, or restarted when certain signals (e.g., an announcement, a paging, an SIB, a PDCCH, etc.) are received.

[0074] 4) A condition related to reception. For example, it can be that the UE 20 performs reception of the group-common announcement in a case where reception of certain signals (e.g., a paging, an SIB, a PDCCH, etc.) fails continuously X times. A counter indicating the number of times of reception can be initialized to start counting again when certain signals (e.g., an announcement, a paging, an SIB, a PDCCH, etc.) are received.

[0075] In addition, the condition is not limited to the above 1) - 4), and can be, for example, a condition related to a communication situation (e.g., a condition or an announcement related to LOS / NLOS, a condition or an announcement related to Doppler), for example, and can be, for example, a condition related to an NTN (e.g., a condition related to an error of timing advance, a condition related to a UE position within a cell).

[0076] Further, in step S203, the UE 20 can transmit a specific channel or signal to the BS 10 when the UE 20 satisfies any one or more of the conditions shown in the following 1) - 4), for example. In addition, the channel situation can be improved from before in a case where the condition is satisfied.

[0077] 1) Condition related to RSRP. For example, the UE 20 can transmit the specific channel or signal to the BS 10 when the RSRP of the SSB and / or CSI-RS is higher than the RSRP threshold defined, configured or notified. The RSRP threshold can be the same as the RSRP threshold of the condition in step S202, or can be different.

[0078] 2) Condition related to configuration or notification. For example, the UE 20 can transmit the specific channel or signal to the BS 10 when the BS 10 configures or notifies the UE 20 to perform reception, i.e., when the UE 20 receives the configuration or notification.

[0079] 3) Condition related to timer. For example, the UE 20 can transmit the specific channel or signal to the BS 10 when a timer is initialized and started upon receiving the notification in step S202, and the UE 20 transmits the specific channel or signal to the BS 10 when the timer expires.

[0080] 4) Condition related to reception. For example, the UE 20 can transmit the specific channel or signal to the BS 10 when some signals are successfully received (e.g., when the notification, paging, SIB, PDCCH, etc. are successfully received for X times in succession).

[0081] The transmission of the specific channel or signal can be performed as shown in 1) or 2) below.

[0082] 1) For example, the UE 20 can transmit 1 bit of information indicating the improvement of the channel condition for data reception via a periodic transmission opportunity (e.g., PRACH, configured PUCCH like SR, configured SRS, configured PUSCH like CG, etc.).

[0083] 2) For example, the UE 20 can also transmit multiple bits of information indicating the channel condition, UE speed, UE-ID (C-RNTI), and / or UE location via PUCCH or PUSCH resources configured or dynamically notified from the BS 10.

[0084] Further, any of the steps can not be performed, for example, step S203 can not be performed. In addition, any of the steps can be replaced with a different action, for example, step S203 can be replaced with the following action. When the notification common to the group is transmitted or received, a timer can be initialized and started in the BS 10 and the UE 20. After the timer expires, the UE 20 can assume that it attempts to receive the corresponding information transmitted from the BS 10. The BS 10 can periodically transmit the information regardless of whether the UE 20 receives the information for ETWS, VoIP, paging, etc.

[0085] Further, the ON period and / or the sleep state of the DRX in the UE 20 can also be changed based on the reception of the notification and the corresponding transceiving.

[0086] In addition, the information indicating no transmission data in step S204 can be 1-bit information via a DCI field or a MAC-CE.

[0087] Figure 7 is a timing chart showing Example (3) of the notification in the NTN. In step S301, the BS 10 transmits a UE-specific notification to the UE 20. In step S302, the UE 20 performs the reception of the UE-specific notification in a case where a condition is satisfied. The monitoring resource related to the reception can be cell-common, group-common, or UE-specific between UEs. The monitoring resource can be set per cell, per UE group, or per UE.

[0088] In step S303, the UE 20 transmits a specific channel or signal to the BS 10. In step S304, the BS 10 transmits information corresponding to the UE to the UE 20.

[0089] The condition in step S302 can be any one or more of the following 1) to 4).

[0090] 1) A condition related to RSRP. For example, it can be that the UE 20 performs the reception of the UE-specific notification in a case where the RSRP of the SSB and / or the CSI-RS is lower than an RSRP threshold value defined, set, or notified.

[0091] 2) A condition related to setting or notification. For example, it can be that the UE 20 performs the reception of the UE-specific notification in a case where the BS 10 sets or notifies the UE 20 to perform the reception.

[0092] 3) A condition related to a timer. For example, it can be that the UE 20 performs the reception of the UE-specific notification when a timer expires. It can be that the timer is initialized, started, or restarted upon reception of certain signals (e.g., a notification, a paging, a SIB, a PDCCH, etc.).

[0093] 4) A condition related to reception. For example, it can be that the UE 20 performs the reception of the UE-specific notification in a case where the reception of certain signals (e.g., a paging, a SIB, a PDCCH, etc.) fails continuously X times. A counter indicating the number of times of reception can be initialized to start counting again upon reception of certain signals (e.g., a notification, a paging, a SIB, a PDCCH, etc.).

[0094] In addition, the conditions are not limited to the above 1) - 4), and can be, for example, conditions related to the communication situation (for example, conditions or notifications related to LOS / NLOS, conditions or notifications related to Doppler), and can be, for example, conditions related to the NTN (for example, conditions related to an error in timing advance, conditions related to the UE position within the cell).

[0095] Further, in step S303, when the UE 20 satisfies any one or more of the conditions shown in, for example, 1) - 4) below, the UE 20 can transmit a specific channel or signal to the BS 10. In addition, in the case where the condition is satisfied, the channel situation can also be improved from before.

[0096] 1) A condition related to RSRP. For example, it can be that when the RSRP of the SSB and / or CSI-RS is higher than an RSRP threshold value defined, set, or notified, the UE 20 transmits the specific channel or signal to the BS 10. The RSRP threshold value can be the same as the RSRP threshold value of the condition in step S302, or can be different.

[0097] 2) A condition related to setting or notification. For example, it can be that when the BS 10 sets or notifies the UE 20 to perform reception, that is, when the UE 20 receives the setting or notification, the UE 20 transmits the specific channel or signal to the BS 10.

[0098] 3) A condition related to a timer. For example, it can be that when the notification is received in step S302, a timer is initialized and started, and when the timer expires, the UE 20 transmits the specific channel or signal to the BS 10.

[0099] 4) A condition related to reception. For example, it can be that when certain signals are successfully received (for example, when the notification, paging, SIB, PDCCH, and the like are successfully received continuously X times), the UE 20 transmits the specific channel or signal to the BS 10.

[0100] The transmission of the specific channel or signal can be performed as shown in 1) or 2) below.

[0101] 1) For example, the UE 20 can transmit information of 1 bit indicating an improvement in the channel situation for data reception via a periodic transmission opportunity (for example, a set PUCCH such as PRACH, a set PUSCH such as CG, and the like).

[0102] 2) For example, the UE 20 can also transmit information of a plurality of bits indicating the channel situation, the UE speed, the UE-ID (C-RNTI), and / or the UE position via a PUCCH or PUSCH resource set or dynamically notified from the BS 10.

[0103] Further, any of the steps can not be performed, for example, step S303 can not be performed. In addition, any of the steps can be replaced with a different action, for example, step S303 can be replaced with the following action. When the notification specific to the UE is transmitted or received, a timer can be initialized and started in the BS 10 and the UE 20. After the timer expires, the UE 20 can assume that it attempts to receive the corresponding information transmitted from the BS 10. The BS 10 can periodically transmit the information regardless of whether the UE 20 receives the ETWS, VoIP-oriented paging, or the like.

[0104] Further, the ON period and / or the sleep state of the DRX in the UE 20 can be changed based on the reception of the notification and the corresponding transmission and reception.

[0105] The notification or the notification information transmitted from the BS 10 to the UE 20 in step S101, step S201, or step S301 can be a channel and / or a signal of the structure represented by 1) to 4) below. In addition, the channel and / or the signal of the structure can be a signal that is easily received in the UE 20 compared to a general downlink signal.

[0106] 1) A signal of a structure similar to a PUCCH. For example, a periodic opportunity in which the notification signal is transmitted can be set. The UE can monitor the opportunity in step S102, step S202, or step S302. Information designating a resource within a time slot and a period can also be set. Further, for example, the format of the signal can be the same as or similar to PUCCH format 0, 1, or 3.

[0107] For example, in the case where the format of the signal is set to be the same as or similar to PUCCH format 0, a base sequence and a cyclic shift can also be used, and a specific cyclic shift is used for the notification. The format can notify 1 bit or 2 bits. Channel coding can not be applied.

[0108] For example, in the case where the format of the signal is set to be the same as or similar to PUCCH format 1, a modulated signal based on a base sequence, BPSK (Binary Phase Shift Keying), or QPSK (Quadrature Phase Shift Keying) and a DMRS can also be used. The notification can be carried by a plurality of symbols that replicate symbols modulated by BPSK or QPSK based on a base sequence. The DMRS and the information of the notification can be alternately mapped in the time domain. The format can notify 1 bit or 2 bits. Channel coding can not be applied.

[0109] For example, in a case where a format of a signal is set to be the same as or similar to PUCCH format 3, a modulated signal based on BPSK, QPSK, or 16QAM (Quadrature amplitude modulation) and a DMRS can also be used. The format can carry 3 bits or more. Channel coding can also be applied.

[0110] 2) Sequence-based signal. For example, an opportunity of periodicity can be set, and a notification signal is transmitted in any of the opportunities. The UE can monitor the opportunity in step S102, step S202, or step S302. Information of a resource within a specified time slot and periodicity can also be set.

[0111] For example, a sequence can be transmitted from the BS 10, and which sequence the UE 20 detects can be mapped to which notification information is received. The mapping can be set via a common signal or a UE-specific signal. For example, an RS can be defined, set, or notified in the notification information. For example, one or a plurality of bits can be carried by the sequence-based signal. A sequence length can be N (for example, N=12), and N can be defined or set. Channel coding can not be applied.

[0112] 3) A PDCCH and a DCI with a smaller number of bits can also be used. For example, a new DCI format can be defined or set with respect to the notification information. The new DCI format can or can not be accompanied by other information. For example, a USS (UE-specific search space) can be used in step S301, and a CSS (Common search space) can be used in step S101.

[0113] For example, when monitoring the PDCCH and the DCI, other specific PDCCH and DCI can not be monitored. For example, the other specific PDCCH can be a DCI accompanied by a CRC scrambled by a P-RNTI.

[0114] A dedicated RNTI can be defined or set with respect to the notification information. The settings for monitoring a search space, a CORESET, and the like can be given by the network. Channel coding (for example, Reed-Muller code) with a smaller payload size of, for example, at most 11 bits can or can not be applied, and CRC bits can or can not be attached. The new DCI format can not be subjected to adjustment of a DCI size. The new DCI format can not be subjected to a limitation of a DCI size budget (at most 4 (3 for C-RNTI + 1 for non-C-RNTI)).

[0115] 4) The notification information can be notified by 1 bit using spare bits included in the MIB.

[0116] The notification or notification information transmitted from the BS 10 to the UE 20 in step S101, step S201, or step S301 can include the information shown in 1) to 4) below.

[0117] 1) It can be a notification of 1 bit. For example, in step S101, the same notification can be made to receive all UEs in a certain cell. For example, in step S201, the transmission resource can be separated between UE groups. For example, in step S301, the transmission resource can be separated between UEs.

[0118] 2) It can also be a notification including target identification information. For example, in step S201, information indicating which UE group is the target of the notification can be included in the notification. For example, in step S301, information indicating which UE is the target of the notification can also be included in the notification. In order to identify the UE group, a UE group ID can be set for each UE and notified via the notification. In addition, in order to identify the UE group, a part of the C-RNTI can also be notified via the notification. In addition, a UE-ID can also be set in order to identify the UE and notified via the notification. In addition, in order to identify the UE, the C-RNTI can be notified via the notification.

[0119] 3) Information indicating which channel and / or signal to receive can be transmitted. For example, a specific SIB targeted for reception can be explicitly notified. In addition, for example, a specific SIB targeted for reception can also be associated with the notification resource.

[0120] 4) Information related to the subsequent reception action can also be transmitted. For example, timing, period, and the like indicating when the corresponding information is transmitted can be transmitted. For example, information indicating that the UE should complete the improvement of the channel condition at what time, and perform the transmission of information indicating the completion of the improvement of the channel condition, and / or information indicating that the reception of the corresponding information (paging targeted for ETWS, VoIP, etc.) should be performed at what time, and a timer for performing the action can also be notified.

[0121] The UE capability shown below can also be defined, and reported from the UE 20 to the BS 10.

[0122] • Whether or not the reception of the notification is supported.

[0123] • Whether or not one or more specific conditions in step S102, step S202, or step S302 are supported.

[0124] • Whether or not one or more specific conditions in step S103, step S203, or step S303 are supported.

[0125] • Whether to support reporting in step S103, step S203, or step S303.

[0126] • Which type of channel and / or signal to support to receive the notification.

[0127] With the above-described embodiments, the terminal 20 can receive an important message based on the notification message. With the timing shown in Figure 5 , it is possible to improve performance with a simple notification message. With the timing shown in Figure 7 , transmitting the notification message only to the target UE can avoid unnecessary or undesired reception. With the timing shown in Figure 6 , it is possible to set Figure 5 and Figure 7 the balance involved in the performance of the timing shown in. It is possible to trigger a subsequent action based on an improvement in channel conditions. The base station 10 can decide whether to perform the subsequent action. By using an existing channel and / or signal in the notification, it is possible to easily implement.

[0128] In addition, according to the above-described embodiments, the base station 10 can prompt the terminal 20 to improve the reception environment by transmitting a notification signal to the terminal 20 with a high reception success probability even in an NLOS environment, and transmit important data to the terminal 20.

[0129] That is, in a wireless communication system, it is possible to improve reception performance in a case where the communication environment is poor.

[0130] (Apparatus Structure)

[0131] Next, an example of the functional structure of the base station 10 and the terminal 20 that perform the above-described processing and actions will be described. The base station 10 and the terminal 20 include the functions that implement the above-described embodiments. However, the base station 10 and the terminal 20 can each have only a part of the functions in the embodiments.

[0132] <Base Station 10>

[0133] Figure 8 is a diagram showing an example of the functional structure of the base station 10 in the embodiment. As shown in Figure 8 , the base station 10 has a transmission section 110, a reception section 120, a setting section 130, and a control section 140. Figure 8 The functional structure shown in is merely an example. The functional division and the names of the functional sections can be arbitrary as long as the actions involved in the embodiment of the present application can be performed.

[0134] The transmission section 110 includes a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal in a wireless manner. Further, the transmission section 110 transmits an inter-network node message to other network nodes. The reception section 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, higher layer information from the received signals. Further, the transmission section 110 has a function of transmitting an NR-PSS, an NR-SSS, an NR-PBCH, a DL / UL control signal, and the like to the terminal 20. Further, the reception section 120 receives an inter-network node message from other network nodes.

[0135] The setting section 130 stores setting information set in advance and various setting information transmitted to the terminal 20. The content of the setting information is, for example, information related to communication in the NTN and the like.

[0136] As explained in the embodiment, the control section 140 performs control related to communication in the NTN. Further, the control section 140 controls communication with the terminal 20 based on a UE capability report related to a radio parameter received from the terminal 20. The functional section in the control section 140 related to signal transmission can be included in the transmission section 110, and the functional section in the control section 140 related to signal reception can be included in the reception section 120.

[0137] <Terminal 20>

[0138] Figure 9 is a diagram illustrating an example of a functional structure of the terminal 20 in the embodiment of the present application. As illustrated in Figure 9 the terminal 20 has a transmission section 210, a reception section 220, a setting section 230, and a control section 240. Figure 9 The functional structure illustrated in the drawing is merely an example. The functional division and the names of the functional sections can be arbitrary as long as the actions related to the embodiment of the present application can be performed.

[0139] The transmission section 210 generates a transmission signal from transmission data and transmits the transmission signal in a wireless manner. The reception section 220 receives various signals in a wireless manner and acquires higher layer signals from the received physical layer signals. Further, the reception section 220 has a function of receiving an NR-PSS, an NR-SSS, an NR-PBCH, a DL / UL / SL control signal, and the like transmitted from the base station 10. Also, for example, as D2D communication, the transmission section 210 transmits a PSCCH (Physical Sidelink Control Channel), a PSSCH (Physical Sidelink Shared Channel), a PSDCH (Physical Sidelink Discovery Channel), a PSBCH (Physical Sidelink Broadcast Channel), and the like to other terminals 20, and the reception section 120 receives a PSCCH, a PSSCH, a PSDCH, or a PSBCH, and the like from other terminals 20.

[0140] The setting section 230 stores various setting information received by the reception section 220 from the base station 10. Further, the setting section 230 also stores setting information set in advance. The content of the setting information is, for example, information related to communication in an NTN, and the like.

[0141] As explained in the embodiments, the control section 240 performs control related to communication in an NTN. It is also possible to include a functional section related to signal transmission in the control section 240 in the transmission section 210 and a functional section related to signal reception in the control section 240 in the reception section 220.

[0142] (Hardware structure)

[0143] The block diagrams used in the explanation of the above-described embodiments Figure 8 and Figure 9 show blocks in units of functions. These functional blocks (structural sections) are realized by an arbitrary combination of at least one of hardware and software. Further, the method of realizing each functional block is not particularly limited. That is, each functional block can be realized using one device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, using wire, wireless, or the like) connected and used. The functional blocks can also be realized in combination with software in the above-described one device or the above-described multiple devices.

[0144] The functions include judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, and the like, but are not limited to these. For example, a functional block (structural unit) that functions to transmit is referred to as a transmitting unit or a transmitter. In general, as described above, the implementation method is not particularly limited.

[0145] For example, the base station 10, the terminal 20, and the like in one embodiment of the present disclosure can also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 10 FIG. 1 is a diagram illustrating an example of a hardware structure of the base station 10 and the terminal 20 according to one embodiment of the present disclosure. The base station 10 and the terminal 20 can also be configured as a computer device that physically includes a processor 1001, a storage 1002, an auxiliary storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0146] In addition, in the following description, the term "device" can be replaced with "circuitry", "apparatus", "unit", and the like. The hardware structure of the base station 10 and the terminal 20 can be configured to include one or more of the illustrated devices, or can be configured not to include a part of the devices.

[0147] Each function of the base station 10 and the terminal 20 is implemented by reading predetermined software (program) into the hardware such as the processor 1001, the storage 1002, and causing the processor 1001 to perform arithmetic operation and at least one of controlling communication of the communication device 1004 or controlling reading and writing of data in the storage 1002 and the auxiliary storage 1003.

[0148] The processor 1001 controls the entire computer by causing an operating system to operate, for example. The processor 1001 can also be configured by a central processing device (CPU) that includes an interface with a peripheral device, a control device, an arithmetic device, a register, and the like. For example, the control unit 140, the control unit 240, and the like can also be implemented by the processor 1001.

[0149] Further, the processor 1001 reads out programs (program codes), software modules, or data, etc., from the storage device 1003 and the communication device 1004 at least one of them to the storage device 1002, and executes various processes according to the programs. As the program, a program that causes the computer to execute at least a part of the operations described in the above-described embodiments is used. For example, Figure 8 The control section 140 of the base station 10 illustrated can also be realized by a control program stored in the storage device 1002 and operated in the processor 1001. Also, for example, Figure 9 The control section 240 of the terminal 20 illustrated can also be realized by a control program stored in the storage device 1002 and operated in the processor 1001. Although it is described that the above-described various processes are executed by one processor 1001, the above-described various processes can also be executed by two or more processors 1001 simultaneously or sequentially. The processor 1001 can also be realized by one or more chips. In addition, the program can also be transmitted from a network via a telecommunication line.

[0150] 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), and the like. The storage device 1002 can also be referred to as a register, a cache, a main memory (main storage device), and the like. The storage device 1002 can hold programs (program codes), software modules, and the like that can be executed in order to implement the communication method related to one embodiment of the present disclosure.

[0151] The auxiliary storage device 1003 is a computer-readable recording medium, and can be constituted by at least one of, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (for example, a card, a stick, a Key drive), a Floppy (registered trademark) disk, a magnetic stripe, and the like. The above-described storage medium can be, for example, a database, a server, and other appropriate medium that includes at least one of the storage device 1002 and the auxiliary storage device 1003.

[0152] The communication device 1004 is hardware (transceiver) used for communication between computers via at least one of a wired network and a wireless network. It may also be referred to as a network device, network controller, network interface card (NIC), communication module, etc. The communication device 1004 may, for example, be configured to include a high-frequency switch, duplexer, filter, frequency synthesizer, etc., to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, transceiver antennas, amplifiers, transceiver units, transmission path interfaces, etc., can also be implemented using the communication device 1004. The transceiver unit may also be physically or logically separated into a transmitting unit and a receiving unit.

[0153] Input device 1005 is an input device that accepts input from external sources (e.g., keyboard, mouse, microphone, switch, button, sensor, etc.). Output device 1006 is an output device that performs output to external sources (e.g., display, speaker, LED, etc.). Alternatively, input device 1005 and output device 1006 can also be integrated (e.g., a touch panel).

[0154] Furthermore, the processor 1001 and storage device 1002, among other devices, are connected via a bus 1007 for communicating information. The bus 1007 can be configured as a single bus or as different buses used between the devices.

[0155] Furthermore, the base station 10 and the terminal 20 can be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or a FPGA (Field Programmable Gate Array), and can also use this hardware to implement part or all of the functional blocks. For example, the processor 1001 can also be implemented using at least one of these hardware components.

[0156] Figure 11 An example of the structure of vehicle 2001 is shown. For example... Figure 11As shown, the vehicle 2001 has a drive section 2002, a steering section 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, an electronic control section 2010, various sensors 2021 to 2029, an information service section 2012, and a communication module 2013. The forms / embodiments explained in the present disclosure can also be applied to the communication device mounted on the vehicle 2001, for example, to the communication module 2013.

[0157] The drive section 2002 is constituted by, for example, an engine, a motor, or a hybrid of an engine and a motor. The steering section 2003 at least includes a steering wheel (also called a steering handle), and is configured to steer at least one of the front wheels and the rear wheels based on an operation of the steering wheel operated by a user.

[0158] The electronic control section 2010 is constituted by a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (I / O port) 2033. Signals from the various sensors 2021 to 2029 possessed by the vehicle 2001 are input to the electronic control section 2010. The electronic control section 2010 can also be called an ECU (Electronic Control Unit).

[0159] As the signals from the various sensors 2021 to 2029, there are a current signal from a current sensor 2021 that senses a current of a motor, a rotational speed signal of the front wheels or the rear wheels acquired by a rotational speed sensor 2022, an air pressure signal of the front wheels or the rear wheels acquired by an air pressure sensor 2023, a vehicle speed signal acquired by a vehicle speed sensor 2024, an acceleration signal acquired by an acceleration sensor 2025, a depression amount signal of the accelerator pedal acquired by an accelerator pedal sensor 2029, a depression amount signal of the brake pedal acquired by a brake pedal sensor 2026, an operation signal of the shift lever acquired by a shift lever sensor 2027, a detection signal for detecting an obstacle, a vehicle, a pedestrian, or the like acquired by an object detection sensor 2028, and the like.

[0160] The information service section 2012 is constituted by various devices for providing (outputting) various information such as driving information, traffic information, entertainment information, and the like, and one or more ECUs that control these devices, such as a car navigation system, an audio system, a speaker, a television, a radio, and the like. The information service section 2012 provides various multimedia information and multimedia services to the occupants of the vehicle 2001 using information acquired from external devices via the communication module 2013 or the like. The information service section 2012 can include an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, or the like) that receives input from the outside, and can also include an output device (for example, a display, a speaker, an LED lamp, a touch panel, or the like) that performs output to the outside.

[0161] The drive assist system section 2030 is constituted by one or more ECUs for providing various devices and controlling these devices for functions to prevent accidents or to reduce the driving load on the driver, such as millimeter wave radar, LiDAR (Light Detection and Ranging), a camera, a positioner for positioning (e.g., GNSS, etc.), map information (e.g., a high-definition (HD) map, an autonomous vehicle (AV) map, etc.), a gyro system (e.g., an IMU (Inertial Measurement Unit), an INS (Inertial Navigation System), etc.), an AI (Artificial Intelligence) chip, an AI processor. In addition, the drive assist system section 2030 transmits and receives various information via the communication module 2013 to implement a drive assist function or an autonomous driving function.

[0162] The communication module 2013 is capable of communicating with the microprocessor 2031 and the constituent elements of the vehicle 2001 via a communication port. For example, the communication module 2013 transmits and receives data between the drive section 2002, the steering section 2003, the accelerator pedal 2004, the brake pedal 2005, the shift lever 2006, the front wheels 2007, the rear wheels 2008, the axles 2009, the microprocessor 2031, and the memory (ROM, RAM) 2032 in the electronic control section 2010, and the sensors 2021 to 2029 possessed by the vehicle 2001 via the communication port 2033.

[0163] The communication module 2013 is capable of being controlled by the microprocessor 2031 of the electronic control section 2010 and is a communication device capable of communicating with an external device. For example, various information is transmitted and received between the external device via wireless communication. The communication module 2013 can be located inside or outside the electronic control section 2010. The external device can also be a base station, a mobile station, or the like, for example.

[0164] The communication module 2013 can also transmit at least one of the signals input to the electronic control section 2010 from the various sensors 2021 to 2028 described above, information obtained based on the signals, and information based on input from the outside (a user) obtained via the information service section 2012 to the external device via wireless communication. The electronic control section 2010, the various sensors 2021 to 2028, the information service section 2012, and the like can also be referred to as input sections that accept input. For example, the PUSCH transmitted by the communication module 2013 can contain information based on the above input.

[0165] The communication module 2013 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device, and displays it on the information service section 2012 possessed by the vehicle 2001. The information service section 2012 can also be referred to as an output section that outputs information (for example, outputs information to a display, a speaker, or the like based on PDSCH (or data / information decoded from the PDSCH) received by the communication module 2013). Furthermore, the communication module 2013 stores various information received from an external device in the memory 2032 that is available to the microprocessor 2031. The microprocessor 2031 can also perform control of the drive section 2002, the steering section 2003, the accelerator pedal 2004, the brake pedal 2005, the shift lever 2006, the front wheels 2007, the rear wheels 2008, the axles 2009, the sensors 2021 to 2029, and the like possessed by the vehicle 2001, based on information stored in the memory 2032.

[0166] (SUMMARY OF EMBODIMENTS)

[0167] As described above, according to the embodiment of the present application, there is provided a terminal having a reception section that receives a notification from a base station that constitutes a non-terrestrial network (NTN), and a transmission section that transmits a signal to the base station, wherein the reception section receives information from the base station to the own device after the transmission section has transmitted the signal to the base station, and the notification is a signal that is easier to receive than a normal downlink signal.

[0168] According to the above-described configuration, the base station 10 is able to cause the terminal 20 to improve the reception environment and transmit important data to the terminal 20 by transmitting a notification signal with a high reception success probability even in an NLOS environment to the terminal 20. That is, in a wireless communication system, it is possible to improve the reception performance in a case where the communication environment is not good.

[0169] It can also be that the reception section monitors the notification in a periodic opportunity. According to this configuration, the base station 10 is able to cause the terminal 20 to improve the reception environment and transmit important data to the terminal 20 by transmitting a notification signal with a high reception success probability even in an NLOS environment to the terminal 20.

[0170] It can also be that the reception section receives the notification via a sequence signal or a downlink control signal to which channel coding for a smaller payload size is applied. According to this configuration, the base station 10 is able to cause the terminal 20 to improve the reception environment and transmit important data to the terminal 20 by transmitting a notification signal with a high reception success probability even in an NLOS environment to the terminal 20.

[0171] It can also be that the receiving section judges which information is the information from the base station to the own device via the reception of the notification. According to this structure, the base station 10 transmits a notification signal with a high probability of successful reception even in an NLOS environment to the terminal 20, thereby enabling the terminal 20 to improve the reception environment and transmit important data to the terminal 20.

[0172] It can also be that the receiving section receives information related to the reception operation of the information from the base station to the own device via the reception of the notification. According to this structure, the base station 10 transmits a notification signal with a high probability of successful reception even in an NLOS environment to the terminal 20, thereby enabling the terminal 20 to improve the reception environment and transmit important data to the terminal 20.

[0173] In addition, according to the embodiment of the present application, there is provided a communication method in which the following steps are performed by a terminal: receiving a notification from a base station constituting a non-terrestrial network (NTN); transmitting a signal to the base station; and receiving information from the base station to the own device after the signal has been transmitted to the base station, the notification being a signal that is easier to receive than a normal downlink signal.

[0174] According to the above structure, the base station 10 transmits a notification signal with a high probability of successful reception even in an NLOS environment to the terminal 20, thereby enabling the terminal 20 to improve the reception environment and transmit important data to the terminal 20. That is, in a wireless communication system, it is possible to improve the reception performance in a case where the communication environment is not good.

[0175] (Supplement to Embodiment)

[0176] The above describes the embodiments of the present application, but the disclosed application is not limited to such embodiments, and those skilled in the art will understand various modifications, changes, substitutions, replacements, and the like. Specific numerical examples are used for facilitating understanding of the application, but these numerical examples are only one example, and any appropriate value can be used unless specifically indicated. The item divisions in the above description are not essential to the present application, and two or more items described in the description can be combined as needed, or an item described in one item can be applied to an item described in another item (as long as there is no contradiction). The boundaries of functional blocks or processing blocks in the functional block diagram do not necessarily correspond to the boundaries of physical components. The actions of multiple functional blocks can be performed by one physical component, or the actions of one functional block can be performed by multiple physical components. As for the processing procedures described in the embodiments, the order of the processing can be changed without contradiction. The base station 10 and the terminal 20 are described using a functional block diagram for facilitating the description of the processing, but such devices can also be implemented by hardware, software, or a combination thereof. Software that acts according to the embodiments of the present application by the processor of the base station 10 and software that acts according to the embodiments of the present application by the processor of the terminal 20 can each be stored in a random access memory (RAM), a flash memory, a read only memory (ROM), an EPROM, an EEPROM, a register, a hard disk (HDD), a removable disk, a CD-ROM, a database, a server, and any other appropriate and arbitrary storage medium.

[0177] Further, the notification of the information is not limited to the forms / embodiments described in the present disclosure, and other methods can be used. For example, the notification of the information can be implemented by physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher 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. Further, the RRC signaling can be referred to as an RRC message, and for example, can be an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0178] The forms / embodiments described in this disclosure can also be applied to at least one of systems utilizing 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), other appropriate systems, and next-generation systems expanded therefrom. Furthermore, a plurality of systems (for example, at least one of LTE and LTE-A and 5G, and the like) can also be applied in combination.

[0179] For the processes, timing, flow, and the like of the forms / embodiments described in this specification, the order can be changed without contradiction. For example, for the methods described in this disclosure, the elements of various steps are prompted using the order of the examples, but are not limited to the specific order prompted.

[0180] In this specification, a specific action by the base station 10 is sometimes also performed by an upper node thereof according to the situation. In a network constituted by one or a plurality of network nodes having the base station 10, it is obvious that various actions performed for communication with the terminal 20 can be performed by at least one of the base station 10 and other network nodes (for example, consider MME or S-GW, or the like, but not limited to these) other than the base station 10. In the above, a case where the other network node other than the base station 10 is one is exemplified, but the other network node can also be a combination of a plurality of other network nodes (for example, MME and S-GW).

[0181] The information or signals and the like described in this 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 a plurality of network nodes.

[0182] The input or output information and the like can be stored in a specific location (e.g., a memory) or managed using a management table. The input or output information and the like can be overwritten, updated, or appended. The output information and the like can also be deleted. The input information and the like can also be transmitted to another device.

[0183] The determination in the present disclosure can be made by a value (0 or 1) represented by 1 bit, by a Boolean value (true or false), or by comparison of numerical values (e.g., comparison with a predetermined value).

[0184] As for software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, it should be broadly interpreted as meaning commands, command sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and the like.

[0185] In addition, software, commands, information, and the like can also be transmitted and received via a transmission medium. For example, in a case where software is transmitted from a web page, a server, or another remote source using at least one of wired technology (coaxial cable, optical fiber cable, twisted pair cable, digital subscriber line (DSL), and the like) and wireless technology (infrared rays, microwaves, and the like), at least one of these wired technology and wireless technology is included in the definition of the transmission medium.

[0186] The information, signals, and the like described in the present disclosure can also be represented using any of various different technologies. For example, data, commands, instructions, information, signals, bits, symbols, chips, and the like that can be involved in the overall description of the present disclosure can be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination of these.

[0187] In addition, for the terms described in the present disclosure and terms necessary for understanding the present disclosure, terms having the same or similar meanings can be substituted. For example, at least one of a channel and a symbol can also be a signal (signaling). Furthermore, the signal can also be a message. Furthermore, a component carrier (CC) can also be referred to as a carrier frequency, a cell, a frequency carrier, and the like.

[0188] The terms "system" and "network" used in the present disclosure can be used interchangeably.

[0189] Moreover, information, parameters, and the like described in the present disclosure can be expressed using absolute values, relative values to predetermined values, or other information corresponding thereto. For example, a radio resource can be indicated using an index.

[0190] The names used for the above-described parameters are non-limiting names in any respect. Furthermore, the formulas and the like using these parameters are sometimes different from those explicitly disclosed in the present disclosure. Various channels (e.g., PUCCH, PDCCH, and the like) and information elements can be identified by all appropriate names, and thus various names assigned to these various channels and information elements are non-limiting names in any respect.

[0191] In the present disclosure, the terms "base station (BS)", "wireless base station", "base station device", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier", and the like can be used interchangeably. The base station is sometimes referred to as a macro cell, a small cell, a femto cell, a pico cell, and the like.

[0192] A base station can accommodate one or a plurality of (e.g., 3) cells. In a case where a base station accommodates a plurality of cells, the coverage area of the base station as a whole can be divided into a plurality of smaller areas, and each of the smaller areas can also be provided with a communication service by a base station subsystem (e.g., a small base station RRH: Remote Radio Head for indoor use). The term "cell" or "sector" refers 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 a communication service in the coverage range.

[0193] In the present disclosure, the base station transmitting information to the terminal can be replaced with the base station instructing the terminal to perform control / action based on the information.

[0194] In the present disclosure, the terms "mobile station (MS)", "user terminal", "user equipment (UE)", "terminal", and the like can be used interchangeably.

[0195] For a mobile station, the following terms are also used by those skilled in the art to refer to a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.

[0196] At least one of the base station and the mobile station can also be referred to as a transmission device, a reception device, a communication device, or the like. In addition, at least one of the base station and the mobile station can be a device mounted on a moving body, the moving body itself, or the like. The moving body refers to an object that can move, and the moving speed is arbitrary. In addition, of course, a case where the moving body is stopped is also included. The moving body includes, for example, a vehicle, a transport vehicle, an automobile, a motorcycle, a bicycle, a connected car, a shovel, a bulldozer, a wheel loader, a dump truck, a forklift, a train, a bus, a two-wheel trailer, a rickshaw, a ship and other watercraft, an airplane, a rocket, an artificial satellite, a Drone (registered trademark), a multicopter, a quadcopter, a balloon, and an object mounted thereon, and is not limited to these. In addition, the moving body can also be a moving body that autonomously travels based on a travel instruction. It can be a vehicle (for example, an automobile, an airplane, or the like), a moving body that moves in a unmanned manner (for example, a drone, a self-driving car, or the like), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station is also included in a device that does not necessarily move when communicating. For example, at least one of the base station and the mobile station can be an IoT (Internet of Things) device such as a sensor.

[0197] Furthermore, the base station in the present disclosure can also be replaced with a user terminal. For example, a structure in which communication between the base station and the user terminal is replaced with communication between a plurality of terminals 20 (for example, can also be referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), or the like) can also apply the forms / embodiments of the present disclosure. In this case, it can also be configured such that the terminal 20 has the functions of the base station 10 described above. Furthermore, the expressions such as "uplink" and "downlink" can also be replaced with expressions corresponding to inter-terminal communication (for example, "side"). For example, the uplink channel, the downlink channel, and the like can also be replaced with a side channel.

[0198] Likewise, the user terminal in the present disclosure can also be replaced with a base station. In this case, it can also be configured such that the base station has the functions of the user terminal described above.

[0199] The terms "determining" and "deciding" as used in the present disclosure also include a variety of actions. For example, "determining" and "deciding" can include an action in which a matter that is judged, calculated, computed, processed, derived, investigated, searched (for example, searched in a table, a database, or other data structure), ascertained, and the like is regarded as "determined" or "decided". In addition, "determining" and "deciding" can include an action in which a matter that is received (for example, received information), transmitted (for example, transmitted information), input, output, accessed (for example, accessed data in a memory), and the like is regarded as "determined" or "decided". Furthermore, "determining" and "deciding" can include an action in which a matter that is resolved, selected, chosen, established, compared, and the like is regarded as "determined" or "decided". That is, "determining" and "deciding" can include an action in which certain actions are regarded as "determined" or "decided". In addition, "determining" and "deciding" can be replaced by "assuming", "expecting", "considering", and the like.

[0200] The terms "connected" and "coupled" or all modifications of these terms used in the present disclosure are intended to mean all kinds of direct or indirect connections or couplings between two or more elements, and can include a case in which one or more intervening elements exist between 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 instead of "connection". In the present disclosure, it can be considered that two elements are "connected" or "coupled" to each other using at least one of a wire, a cable, and a printed circuit, and as some non-limiting and non-inclusive examples, electromagnetic energy having a wavelength in a radio frequency region, a microwave region, and an optical (including both visible and invisible) region is used to "connect" or "couple" to each other.

[0201] The reference signal can be referred to simply as RS (Reference Signal), and can also be referred to as a pilot (Pilot) depending on the applied standard.

[0202] The expression "based on" as used in the present disclosure is not intended to mean "only based on" unless specifically indicated otherwise. In other words, the expression "based on" means both "only based on" and "at least based on."

[0203] Any reference to elements using the expressions "1st", "2nd", and the like used in the present disclosure does not necessarily limit the number or order of the elements. These expressions can be used in the present disclosure as a convenient method of distinguishing between two or more elements. Accordingly, a reference to a 1st element and a 2nd element does not mean that only two elements are possible or that in any way the 1st element must precede the 2nd element in any way.

[0204] The expression "unit" in the structure of each of the above-described apparatuses can be replaced with the expression "part", "circuit", "device", or the like.

[0205] When the expressions "include", "including", and variations thereof are used in the present disclosure, these expressions mean the same as the expression "comprising". Also, the expression "or" used in the present disclosure does not mean the exclusive or.

[0206] A radio frame can be composed of one or more frames in the time domain. In the time domain, one or more frames can be referred to as a subframe. A subframe can also be composed of one or more slots in the time domain. A subframe can also be a fixed length of time (e.g., 1 ms) independent of numerology.

[0207] A numerology can be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The numerology can indicate at least one of, for example, 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 specific filtering process performed by a transceiver in the frequency domain, a specific windowing process performed by a transceiver in the time domain, and the like.

[0208] A slot can be constituted by one or a plurality of symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, and the like) in the time domain. A slot can be a time unit based on a numerology.

[0209] A slot can include a plurality of mini-slots. Each mini-slot can be constituted by one or a plurality of symbols in the time domain. Further, a mini-slot can also be referred to as a sub-slot. A mini-slot can be constituted by a smaller number of symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot can be referred to as PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot can be referred to as PDSCH (or PUSCH) mapping type B.

[0210] A radio frame, a subframe, a slot, a mini-slot, and a symbol each represent a time unit in transmission of a signal. A radio frame, a subframe, a slot, a mini-slot, and a symbol can each be referred to by another corresponding term.

[0211] For example, 1 subframe can be referred to as a transmission time interval (TTI), a plurality of consecutive subframes can also be referred to as a TTI, 1 slot or 1 mini-slot can also be referred to as a TTI. That is, at least one of a subframe and a TTI can be a subframe (1 ms) in the existing LTE, can be a period shorter than 1 ms (for example, 1 to 13 symbols), or can be a period longer than 1 ms. In addition, a unit representing a TTI can not be referred to as a subframe, but can be referred to as a slot, a mini-slot, or the like.

[0212] Here, a TTI, for example, refers to a minimum time unit of scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling in which a radio resource (a frequency bandwidth, a transmission power, and the like, which can be used in each terminal 20) is allocated to each terminal 20 in units of a TTI. In addition, the definition of a TTI is not limited thereto.

[0213] A TTI can be a transmission time unit of a data packet (a transport block) after channel coding, a code block, a codeword, or the like, or can be a processing unit of scheduling, link adaptation, or the like. In addition, when a TTI is given, a time interval (for example, a number of symbols) in which a transport block, a code block, a codeword, or the like is actually mapped can be shorter than the TTI.

[0214] In addition, in a case where one slot or one mini-slot is referred to as a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) can be a minimum time unit of scheduling. Further, the number of slots (mini-slots) constituting the minimum time unit of scheduling can be controlled.

[0215] A TTI having a time length of 1 ms is also referred to as a normal TTI (TTI in LTE Rel. 8-12), a normal TTI (normal TTI), a long TTI (long TTI), a normal subframe, a normal subframe (normal subframe), a long (long) subframe, a slot, and the like. A TTI shorter than the normal TTI can also be referred to as a shortened TTI, a short TTI (short TTI), a partial TTI (partial or fractional TTI), a shortened subframe, a short (short) subframe, a mini-slot, a sub-slot, a slot, and the like.

[0216] In addition, for a long TTI (long TTI) (e.g., a normal TTI, a subframe, and the like), it can be understood as a TTI having a time length exceeding 1 ms, and for a short TTI (short TTI) (e.g., a shortened TTI, and the like), it can be understood as a TTI having a TTI length smaller than that of the long TTI (long TTI) and a TTI length of 1 ms or more.

[0217] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, can include one or a plurality of contiguous subcarriers. The number of subcarriers included in the RB can be the same regardless of the numerology, and for example, can be 12. The number of subcarriers included in the RB can also be determined according to the numerology.

[0218] In addition, the time domain of the RB can include one or a plurality of symbols, and can be the length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, and the like can each be constituted by one or a plurality of resource blocks.

[0219] In addition, one or a plurality of RBs can also be referred to as a physical resource block (PRB), a subcarrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, and the like.

[0220] In addition, a resource block can be constituted by one or a plurality of resource elements (REs). For example, one RE can be a wireless resource area of one subcarrier and one symbol.

[0221] The Bandwidth Part (BWP) (also known as partial bandwidth, etc.) can also represent a subset of contiguous common resource blocks (RBs) used for a certain parameter set in a certain carrier. Here, common RBs can be determined by indexing RBs based on a common reference point of that carrier. PRBs can be defined and numbered within a BWP.

[0222] A BWP can include a UL BWP and a DL BWP. One or more BWPs can be set for a UE within a single carrier.

[0223] At least one of the configured BWPs can be active, and the scenario of the UE transmitting or receiving predetermined signals / channels outside of the active BWP is not considered. Furthermore, the terms "cell," "carrier," etc., used in this disclosure can be replaced with "BWP."

[0224] The structures of radio frames, subframes, time slots, mini-time slots, and symbols described above are merely illustrative. For example, the number of subframes contained in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots contained within a time slot, the number of symbols and RBs contained in a time slot or mini-time slot, the number of subcarriers contained in an RB, and the number of symbols in a TTI, symbol length, and cyclic prefix (CP) length can be varied in many ways.

[0225] In this disclosure, for example, in cases where articles are added through translation, such as in English (a, an, and the), this disclosure also includes cases where the noun following these articles is in a plural form.

[0226] In this disclosure, the phrase "A and B are different" can mean "A and B are not the same." Additionally, this phrase can also mean "A and B are each different from C." Terms such as "separate" and "combined" can also be interpreted in the same way as "different."

[0227] The various forms / implementations described in this disclosure can be used individually or in combination, and can be switched depending on the execution. Furthermore, the notification of predetermined information (e.g., a "It is X" notification) is not limited to being explicit, but can also be implicit (e.g., not being notified of the predetermined information).

[0228] The present disclosure has been described in detail above, but it should be clear to a person 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 changed forms without departing from the spirit and scope of the present disclosure defined by the claims. Therefore, the purpose of the present disclosure is to illustrate, and the present disclosure is not intended to have any limiting meaning.

[0229] Explanation of Reference Signs

[0230] 10: base station

[0231] 110: transmission section

[0232] 120: reception section

[0233] 130: setting section

[0234] 140: control section

[0235] 20: terminal

[0236] 210: transmission section

[0237] 220: reception section

[0238] 230: setting section

[0239] 240: control section

[0240] 1001: processor

[0241] 1002: storage device

[0242] 1003: auxiliary storage device

[0243] 1004: communication device

[0244] 1005: input device

[0245] 1006: output device

[0246] 2001: vehicle

[0247] 2002: drive section

[0248] 2003: steering section

[0249] 2004: accelerator pedal

[0250] 2005: brake pedal

[0251] 2006: gear lever

[0252] 2007: front wheel

[0253] 2008: rear wheel

[0254] 2009: axle

[0255] 2010: Electronic control unit

[0256] 2012: Information service unit

[0257] 2013: Communication module

[0258] 2021: Current sensor

[0259] 2022: Rotation speed sensor

[0260] 2023: Air pressure sensor

[0261] 2024: Vehicle speed sensor

[0262] 2025: Acceleration sensor

[0263] 2026: Brake pedal sensor

[0264] 2027: Gear lever sensor

[0265] 2028: Object detection sensor

[0266] 2029: Accelerator pedal sensor

[0267] 2030: Driving assistance system unit

[0268] 2031: Microprocessor

[0269] 2032: Memory (ROM, RAM)

[0270] 2033: Communication port (I / O port)

Claims

1. A terminal having: The receiving unit receives notifications from base stations constituting the non-terrestrial network, i.e., the NTN; and The transmitting unit sends signals to the base station. After the transmitting unit sends the signal to the base station, the receiving unit receives information sent from the base station to its own device. The notification is a signal that is easier to receive than a typical downlink signal.

2. The terminal according to claim 1, wherein, The receiving unit monitors the notification periodically.

3. The terminal according to claim 1, wherein, The receiving unit receives the notification via a sequence signal or a downlink control signal that applies channel coding for smaller payload sizes.

4. The terminal according to claim 1, wherein, The receiving unit determines which information is being sent from the base station to its own device by receiving the notification.

5. The terminal according to claim 1, wherein, The receiving unit receives information related to the receiving action of information sent from the base station to its own device via the receipt of the notification.

6. A communication method, wherein, The terminal performs the following steps: Receive notifications from base stations that constitute the non-terrestrial network, i.e., NTN; Sending signals to the base station; and After sending the signal to the base station, it receives information sent from the base station to its own device. The notification is a signal that is easier to receive than a typical downlink signal.

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