WO2020039515A1

WO2020039515A1 - User device and base station device

Info

Publication number: WO2020039515A1
Application number: PCT/JP2018/030964
Authority: WO
Inventors: 良介大澤; 和晃武田
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2018-08-22
Filing date: 2018-08-22
Publication date: 2020-02-27
Also published as: CN112470549A

Abstract

A user device has: a reception unit that receives a plurality of reference signals; and a control unit that executes, on the basis of a coverage state determined on the basis of the result of measurements of the plurality of reference signals, a control for inter-terminal direct communication applied to resources associated with the reference signals.

Description

User equipment and base station equipment

<< The present invention relates to a user apparatus and a base station apparatus in a wireless communication system.

In LTE (Long Term Evolution) and a successor system to LTE (for example, LTE-A (LTE Advanced), NR (New Radio) (also referred to as 5G)), user devices directly communicate with each other without passing through a base station device. A D2D (Device @ to \ Device) technique to be performed has been studied (for example, Non-Patent Document 1).

D2D reduces traffic between a user apparatus and a base station apparatus, and enables communication between user apparatuses even when the base station apparatus becomes unable to communicate during a disaster or the like. In 3GPP (3rd Generation Partnership Project), D2D is referred to as “sidelink”, but in this specification, D2D which is a more general term is used. However, in the following description of the embodiments, side links are used as necessary.

D2D communication includes D2D discovery (D2D @ discovery, also referred to as D2D discovery) for discovering another communicable user device, and D2D communication (D2D @ direct @ communication, D2D communication, terminal for direct communication between user devices). Direct communication, terminal-to-terminal communication, etc.). In the following, D2D communication, D2D discovery, and the like are simply referred to as D2D unless otherwise distinguished. A signal transmitted and received in D2D is called a D2D signal. Various use cases of a service related to V2X (Vehicle to Everything) in NR are being studied (for example, Non-Patent Document 2).

When the user apparatus is performing communication to which dual connectivity of different RATs (Radio Access Technology) is applied, it is not clear whether to perform control within the coverage or outside the coverage depending on the RAT of the D2D communication. was there.

The present invention has been made in view of the above points, and it is an object of the present invention to apply control from a base station apparatus in direct communication between terminals according to a communication situation.

According to the disclosed technology, a receiving unit that receives a plurality of reference signals, and control of direct communication between terminals applied to resources associated with the reference signals is determined based on a measurement result of the plurality of reference signals. And a control unit that executes based on the coverage state.

According to the disclosed technology, in direct communication between terminals, control from the base station device can be applied according to the communication status.

It is a figure for explaining V2X. 1 is a diagram illustrating an example of a wireless communication system according to an embodiment of the present invention. 5 is a flowchart for explaining communication according to the embodiment of the present invention. FIG. 3 is a diagram illustrating an example (1) of a reference signal according to the embodiment of the present invention. FIG. 4 is a diagram illustrating an example (2) of a reference signal according to the embodiment of the present invention. FIG. 2 is a diagram illustrating an example of a functional configuration of a base station device 10 according to an embodiment of the present invention. FIG. 2 is a diagram illustrating an example of a functional configuration of a user device 20 according to the embodiment of the present invention. FIG. 3 is a diagram illustrating an example of a hardware configuration of the base station device 10 or the user device 20 according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

既存 In the operation of the wireless communication system according to the embodiment of the present invention, existing technology is used as appropriate. However, the existing technology is, for example, existing LTE, but is not limited to existing LTE. Further, the term “LTE” used in this specification has a broad meaning including LTE-Advanced and a scheme after LTE-Advanced (eg, NR), unless otherwise specified.

Further, in the embodiment of the present invention, the duplex system may be a TDD (Time Division Duplex) system, an FDD (Frequency Division Duplex) system, or any other system (for example, Flexible Duplex). May be used.

In the following description, a method of transmitting a signal using a transmission beam may be digital beamforming for transmitting a signal multiplied by a precoding vector (precoded with a precoding vector), Analog beamforming that achieves beamforming using a variable phase shifter in an RF (Radio @ Frequency) circuit may be used. Similarly, the method of receiving a signal using a reception beam may be digital beamforming that multiplies a received signal by a predetermined weight vector, or realizes beamforming using a variable phase shifter in an RF circuit. Analog beam forming. Hybrid beamforming combining digital beamforming and analog beamforming may be applied. Also, transmitting a signal using a transmission beam may be transmitting a signal at a specific antenna port. Similarly, receiving a signal using a receive beam may be receiving a signal at a particular antenna port. An antenna port refers to a logical antenna port or a physical antenna port defined in the 3GPP standard. Also, the precoding or beamforming may be referred to as a precoder or a spatial domain filter (Spatial \ domain \ filter).

In addition, the method of forming the transmission beam and the reception beam is not limited to the above method. For example, in the base station apparatus 10 or the user apparatus 20 including a plurality of antennas, a method of changing the angle of each antenna may be used, or a method of combining a method using a precoding vector and a method of changing the angle of the antenna may be used. Alternatively, a different antenna panel may be used by switching, a method combining a plurality of antenna panels may be used, or another method may be used. Further, for example, a plurality of different transmission beams may be used in a high frequency band. The use of a plurality of transmission beams is called multi-beam operation, and the use of one transmission beam is called single-beam operation.

Further, in the embodiment of the present invention, the “configure” of the wireless parameter or the like may mean that a predetermined value is set in advance (Pre-configure), or the base station apparatus 10 Alternatively, a wireless parameter notified from the user device 20 may be set.

FIG. 1 is a diagram for explaining V2X. In 3GPP, realization of V2X (Vehicle to Everything) or eV2X (enhanced V2X) by expanding the D2D function has been studied, and specifications are being promoted. As shown in FIG. 1, V2X is a part of ITS (Intelligent Transport Systems) and means V2V (Vehicle to to Vehicle), which means a form of communication performed between cars, and a roadside installed on the side of a car and a road. V2I (Vehicle-to-Infrastructure), which means a form of communication performed with an RSU (Road-Side @ Unit), and V2N (Vehicle-to-infrastructure), which means a form of communication performed between an automobile and a mobile terminal possessed by a driver. Nomadic device, and V2P (Vehicle to Pedestrian) meaning a form of communication between a car and a mobile terminal carried by a pedestrian.

Also, 3GPP is studying V2X using LTE or NR cellular communication and terminal-to-terminal communication. It is assumed that studies on L2 or NR V2X not limited to the 3GPP specifications will be made in the future. For example, ensuring interoperability, reducing costs by implementing higher layers, using or switching multiple RATs (Radio Access Technology), supporting regulations in each country, acquiring data from LTE or NR V2X platforms, distributing, managing databases, It is assumed that usage methods will be considered.

において In the embodiment of the present invention, a form in which the communication device is mounted on a vehicle is mainly assumed, but the embodiment of the present invention is not limited to this form. For example, the communication device may be a terminal held by a person, the communication device may be a device mounted on a drone or an aircraft, the communication device may be a base station, an RSU, a relay station (relay node), It may be a user device having scheduling capability.

Note that SL (Sidelink) may be distinguished from UL (Uplink) or DL (Downlink) based on any one or combination of the following 1) -4). SL may be another name.
1) Resource allocation in time domain 2) Resource allocation in frequency domain 3) Reference synchronization signal (including SLSS (Sidelink Synchronization Signal))
4) Reference signal used for path loss measurement for transmission power control

Also, regarding SL or UL OFDM (Orthogonal Frequency Division Multiplexing), CP-OFDM (Cyclic-Prefix OFDM), DFT-S-OFDM (Discrete Fourier Transform-Spread-OFDM), Transform not pre-coded or non-transformed non-transformed OFDM Any of the available OFDMs may be applied.

In the LTE SL, Mode 3 and Mode 4 are defined for SL resource allocation to the user apparatus 20. In Mode 3, transmission resources are dynamically allocated by DCI (Downlink \ Control \ Information) transmitted from the base station apparatus 10 to the user apparatus 20. In Mode 3, SPS (Semi \ Persistent \ Scheduling) is also possible. In Mode 4, the user device 20 autonomously selects a transmission resource from the resource pool.

The operation of the user device 20 according to the embodiment of the present invention may be applied to transmission / reception of SL, or may be applied to transmission / reception of DL or UL. Further, in the embodiment of the present invention, “cell” may be replaced with a carrier component, may be replaced with a cell group, or may be replaced with BWP (Bandwidth part). Further, the “cell” may be replaced with another wireless system such as a RAT or a wireless LAN (Local Area Network).

FIG. 2 is a diagram illustrating an example of a wireless communication system according to an embodiment of the present invention. As shown in FIG. 2, the radio communication system includes a base station device 10A that is an eNB (evolved @ NodeB), a base station device 10B that is a gNB (next @ generation @ NodeB), a user device 20A, a user device 20B, and a user device 20C. Including.

The base station device 10A is an eNB configuring an LTE cell. Regarding the base station device 10A, the user device 20A and the user device 20B are in the coverage, and the user device 20C is out of the coverage. In the LTE side link, both the case where the user apparatus 20 is in the coverage and the case where the user apparatus 20 is out of the coverage are supported. Whether it is within the coverage or outside the coverage is determined based on the DL measurement. For example, the user apparatus 20 determines that the data is within the coverage when the DL RSRP (Reference Signal Received Power) exceeds a predetermined threshold, and determines that the data is out of the coverage when the DL RSRP is less than the predetermined threshold.

場合 When the user device 20 is within the coverage, the SL resource may be set by the base station device 10, that is, the eNB or the gNB. When the user apparatus 20 is out of coverage, the SL resource may be preset or defined by the base station apparatus 10 or the specification, and the user apparatus 20 autonomously allocates the SL transmission resource from the set resource pool. You may choose.

On the other hand, the base station device 10B is a gNB configuring a cell of NR. Regarding the base station device 10B, the user device 20B is within the coverage, and the user device 20A and the user device 20C are outside the coverage. The resource of the SL of NR may be set by a control signal of either LTE or NR, or may be set or defined in advance according to specifications. The user apparatus 20 autonomously sets the SL from the set resource pool. May be selected. The control signal is transmitted to the user device 20 by, for example, RRC (Radio Resource Control) signaling, MAC (Media Access Control) signaling, DCI (Downlink Control Information), or SCI (Sidelink Control Information).

Here, the coverage range of the LTE cell and the NR cell usually differs as shown in FIG. 2 depending on the network arrangement, the communication system, or the carrier frequency. Therefore, in the example of FIG. 2, when the user apparatus 20A determines whether it is in the coverage or out of the coverage by the DL measurement of the NR, in the LTE cell, the user apparatus 20A is in the coverage, and the base station apparatus 10A performs the SL. The user device 20A may execute the control when the coverage is out of the coverage even though the resource setting of “1” is possible. Further, since the coverage range of the NR is generally smaller than that of LTE, there is a possibility that the state that is within the coverage and the state that is outside the coverage are frequently switched. For this reason, it is assumed that SL resource usage efficiency is reduced and SL communication is frequently interrupted.

FIG. 3 is a flowchart for explaining communication in the embodiment of the present invention. The user device 20 determines the coverage state by measuring a plurality of reference signals, and performs appropriate SL communication control.

In step S1, the user device 20 measures a plurality of reference signals transmitted for each cell or each RAT. Subsequently, in step S2, the user device 20 determines whether the data is within the coverage or out of the coverage based on the measurement result of one or more reference signals. When the reference signal is transmitted for each cell, it may be determined for each cell whether the reference signal is within the coverage or outside the coverage. When the reference signal is transmitted for each RAT, it may be determined for each RAT whether the reference signal is within the coverage or outside the coverage. Alternatively, a determination using a reference signal transmitted in a plurality of cells or RATs may be used to determine in-coverage or out-of-coverage common to a plurality of cells or RATs.

When multiple cells and / or multiple RATs are used, a per-cell or per-RAT reference signal is set that is used for measurements to determine in-coverage or out-of-coverage. The reference signal is a synchronization signal or a reference signal transmitted by any of DL, UL, or SL. For example, PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal), CRS (Cell Reference Signal), CSI-RS (Channel State Information Reference Signal), DMRS (Demodulation Reference Signal), SRS (Sounding Reference Signal), PT- RS (Phase Tracking Reference Signal), PSSS (Primary Sidelink Synchronization Signal), SSSS (Secondary Sidelink Synchronization Signal), etc. may be the reference signal.

The reference signal used for the measurement for determining whether the signal is in the coverage or out of the coverage may be set by either LTE or NR signaling, or may be set by both LTE and NR signaling. . The signaling may be, for example, PBCH (Physical Broadcast Channel), RRC signaling, MAC signaling, DCI or SCI (Sidelink Control Information).

The threshold used for measurement to determine whether the signal is within the coverage or out of the coverage, the timer value of the TimeToTrigger, the adjustment value of the hysteresis, and the like may be included in the signaling in which the reference signal is set, or may be set separately. May be done. Also, for example, it may be derived from other parameters such as a parameter Q _rxlevmin or Q _qualmin used for cell selection. Note that Q _rxlevmin indicates the minimum reception level required for cell selection, and Q _qualmin indicates the minimum quality level required for cell selection. In addition, the threshold value, the measurement reference, the timer value, and the like may be set in common among a plurality of reference signals, or may be set individually.

参照 It may be set to determine whether the reference signal of the serving cell and / or the neighboring cell is within the coverage or out of the coverage. The user apparatus 20 may determine the coverage to be outside or within the coverage based on the measurement result of the reference signal of the serving cell or the measurement result of the reference signal of the neighboring cell. For example, if the measurement result of the serving cell falls below a predetermined threshold, it may be determined that the cell is out of coverage. When the measurement result of the neighboring cell exceeds a predetermined threshold, it may be determined that the cell is out of coverage. Further, when the measurement result of the serving cell falls below a predetermined threshold and the measurement result of an adjacent cell exceeds the predetermined threshold, it may be determined that the cell is out of coverage.

(4) The user device 20 performs measurement using the set reference signal. In the measurement, the indexes calculated are, for example, RSRP, RSRQ (Reference Signal Received Quality), SINR (Signal to Interference Plus Noise Power Ratio), RSSI (Received Signal Strength Indicator), path loss, and CQI (Channel Quality Indicator). .

In step S3, the user device 20 uses the side link resources associated with the reference signal based on the determined coverage state. When the measurement results of the plurality of reference signals in a certain resource satisfy a predetermined condition, the user apparatus 20 performs an operation related to the defined SL when the resource is out of coverage, and when the predetermined condition is not satisfied, The user device 20 executes the operation related to the SL defined when the resource is within the coverage. For example, when it is determined that the data is out of the coverage, the use of the resources set for the inside of the coverage may be stopped or / and the resources set for the outside of the coverage may be used. Further, a synchronization signal to be referred to (eg, a signal transmitted from any one of a GNSS (Global Navigation Satellite System), a base station device, and a user device) may be changed according to the coverage state. Alternatively, the applied waveform (eg, application of Transform @ precoding), numerology, or BWP may be changed according to the coverage state. The resource may be a resource of the entire cell, a resource of the entire RAT, or a part of a radio resource specified in a predetermined frequency domain and a predetermined time domain. Examples of the predetermined conditions are shown in 1) -3) below.

1) A case where the determination based on the set threshold value is satisfied by the measurement result of at least one of the plurality of reference signals. The case where one measurement result satisfies the determination may continue until the predetermined timer expires.
2) The case where the determination based on the set threshold value is satisfied by the measurement results of N reference signals among the plurality of reference signals. The state in which the N measurement results satisfy the determination may continue until the predetermined timer expires. N may be specified in advance in the specification or may be set in the base station device 10.
3) When the measurement results of all the reference signals satisfy the determination based on the set threshold. The case where all the measurement results satisfy the determination until the predetermined timer expires may be continued.

Here, in the above 1) -3), the determination based on the set threshold may be a case where the measurement result falls below the threshold, such as a case where the RSRP of the serving cell falls below the threshold. The determination based on the set threshold may be a case where the measurement result exceeds the threshold, for example, a case where the RSRP of the neighboring cell exceeds the threshold.

リソース Also, resources used when the user device 20 is out of coverage may be set or defined in advance. Further, the user apparatus 20 may use different parameters for parameters such as a threshold value for measuring a reference signal, a timer value, and a hysteresis adjustment value according to an RRC state such as connected, inactive, or idle.

FIG. 4 is a diagram illustrating an example (1) of a reference signal according to the embodiment of the present invention. For each reference signal, the state of being in the coverage or out of the coverage may be determined. As shown in FIG. 4, the resources of multiple SLs may be associated with one reference signal or a group of reference signals. The reference signal group may be, for example, a plurality of reference signals that are QCL (Quasi co-located). The resource may be a resource of the entire cell, a resource of the entire RAT, or a part of a radio resource specified in a predetermined frequency domain and a predetermined time domain.

As shown in FIG. 4, the NR reference signal RS # 0 is associated with the NR SL resources SL @ resource # 0 and SL @ resource # 1, and the LTE reference signal RS # 1 is associated with the LTE SL resource SL. resource # 2.

When the measurement result of the reference signal satisfies the out-of-coverage determination by the set threshold, the operation of the SL defined in the case where the SL resource associated with the reference signal is out of coverage may be applied. . For example, if the measurement result of RS # 0 satisfies the out-of-coverage determination based on the set threshold value, even if the operation related to SL defined when the out-of-coverage is applied to SL @ resource # 0 and SL @ resource # 1 is applied. Good. Further, for example, when the measurement result of the RS # 1 satisfies the out-of-coverage determination based on the set threshold, the operation related to SL defined when the out-of-coverage is applied to the SL @ resource # 2 may be applied.

FIG. 5 is a diagram illustrating an example (2) of the reference signal according to the embodiment of the present invention. As shown in FIG. 5, one resource may be associated with a plurality of reference signals. As shown in FIG. 5, the NR reference signal RS # 0 is associated with the NR SL resources SL @ resource # 0 and SL @ resource # 1, and the LTE reference signal RS # 1 is associated with the NR SL resource SL. resource # 0 and SL @ resource # 1 are associated with LTE SL resource SL @ resource # 2. For example, if the measurement result of RS # 0 satisfies the out-of-coverage determination based on the set threshold value, even if the operation related to SL defined when the out-of-coverage is applied to SL @ resource # 0 and SL @ resource # 1 is applied. Good. Alternatively, when the measurement results of RS # 0 and RS # 1 both satisfy the determination of out-of-coverage based on the set threshold value, the operation related to SL defined when SL @ resource # 0 and SL @ resource # 1 are out of coverage. May be applied. Further, for example, when the measurement result of RS # 1 satisfies the out-of-coverage determination based on the set threshold, SL @ resource # 0, SL @ resource # 1, and SL @ resource # 2 are not defined as SLs when out of coverage. Such an operation may be applied.

戻る Return to FIG. In step S <b> 4, when the report is triggered, the user apparatus transmits to the base station apparatus 10 a coverage state in which it is determined whether the coverage is outside the coverage or within the coverage. The condition under which the report is triggered may be set or defined in advance by the base station device 10 or specifications. For example, the user device 20 may set a case where one or a plurality of reference signals satisfies the determination regarding the coverage state as a report trigger condition. The report may include the measurement result in addition to the coverage state.

Note that the user device 20 may skip monitoring of the reference signal determined to be out of coverage.

According to the above-described embodiment, the user apparatus 20 measures a plurality of reference signals, determines whether out of coverage or in coverage, for each cell, each RAT, or each resource, and controls the control of D2D communication. It can be executed according to the state. In addition, the user device 20 can execute the control of the D2D communication according to the coverage state in each of the coverages of different RATs. In addition, the user apparatus 20 can efficiently use the NR SL resources by LTE signaling even outside the NR coverage.

That is, in direct communication between terminals, control from the base station device can be applied according to the communication situation.

(Device configuration)
Next, an example of a functional configuration of the base station device 10 and the user device 20 that execute the processes and operations described above will be described. The base station device 10 and the user device 20 include a function for implementing the above-described embodiment. However, each of the base station device 10 and the user device 20 may include only some of the functions in the embodiment.

<Base station device 10>
FIG. 6 is a diagram illustrating an example of a functional configuration of the base station device 10. As shown in FIG. 6, base station apparatus 10 includes transmitting section 110, receiving section 120, setting section 130, and control section 140. The functional configuration shown in FIG. 6 is merely an example. As long as the operation according to the embodiment of the present invention can be executed, the names of the functional divisions and the functional units may be any.

The transmission unit 110 has a function of generating a signal to be transmitted to the user device 20 and transmitting the signal wirelessly. The receiving unit 120 includes a function of receiving various signals transmitted from the user device 20 and acquiring, for example, information of a higher layer from the received signals. In addition, the transmitting unit 110 has a function of transmitting an NR-PSS, an NR-SSS, an NR-PBCH, a DL / UL control signal, a DL reference signal, and the like to the user device 20.

The setting unit 130 stores in the storage device the setting information set in advance and various setting information to be transmitted to the user device 20, and reads out the setting information from the storage device as needed. The content of the setting information is, for example, information related to a reference signal, information related to setting of D2D communication, and the like.

The control unit 140 performs the process related to the setting for the user device 20 to perform the D2D communication, as described in the embodiment. A function unit related to signal transmission in control unit 140 may be included in transmitting unit 110, and a function unit related to signal reception in control unit 140 may be included in receiving unit 120.

<User device 20>
FIG. 7 is a diagram illustrating an example of a functional configuration of the user device 20. As illustrated in FIG. 7, the user device 20 includes a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in FIG. 7 is only an example. As long as the operation according to the embodiment of the present invention can be executed, the names of the functional divisions and the functional units may be any.

(4) The transmission unit 210 creates a transmission signal from transmission data, and transmits the transmission signal wirelessly. The receiving unit 220 wirelessly receives various signals and obtains a higher-layer signal from the received physical-layer signal. Further, the receiving section 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, a DL / UL / SL control signal, a reference signal, and the like transmitted from the base station device 10. In addition, for example, the transmission unit 210 transmits the PSCCH (Physical Sidelink Shared Channel), the PSSCH (Physical Sidelink Shared Channel), the PSDCH (Physical Sidelink Discovery Channel), and the PSBCH (Physical Sidelink Broadcast Channel) to another user device 20 as D2D communication. ) And the like, and the receiving unit 220 receives a PSCCH, a PSSCH, a PSDCH, a PSBCH, or the like from another user apparatus 20.

The setting unit 230 stores various setting information received from the base station device 10 or the user device 20 by the receiving unit 220 in a storage device, and reads out the setting information from the storage device as needed. The setting unit 230 also stores preset setting information. The content of the setting information is, for example, information related to a reference signal, information related to setting of D2D communication, and the like.

The control unit 240 controls the D2D communication with another user device 20 as described in the embodiment. Further, control section 240 performs measurement based on the received reference signal. A function unit related to signal transmission in control unit 240 may be included in transmission unit 210, and a function unit related to signal reception in control unit 240 may be included in reception unit 220.

(Hardware configuration)
The functional configuration diagrams (FIGS. 6 and 7) used in the description of the embodiment of the present invention show blocks of functional units. These functional blocks (components) are realized by an arbitrary combination of hardware and / or software. The means for implementing each functional block is not particularly limited. That is, each functional block may be realized by one device in which a plurality of elements are physically and / or logically combined, or two or more devices physically and / or logically separated directly and And / or indirectly (for example, wired and / or wireless), and may be implemented by these multiple devices.

For example, both the base station device 10 and the user device 20 according to an embodiment of the present invention may function as a computer that performs processing according to the embodiment of the present invention. FIG. 8 is a diagram illustrating an example of a hardware configuration of a wireless communication device that is the base station device 10 or the user device 20 according to the embodiment of the present invention. Each of the above-described base station device 10 and user device 20 is physically a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. It may be configured.

In the following description, the term “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configuration of the base station device 10 and the user device 20 may be configured to include one or more of the devices indicated by 1001 to 1006 illustrated in the drawing, or may be configured without including some devices. May be done.

The functions of the base station device 10 and the user device 20 are performed by reading predetermined software (program) on hardware such as the processor 1001 and the storage device 1002, so that the processor 1001 performs an arithmetic operation. This is realized by controlling reading and / or writing of data in the storage device 1002 and the auxiliary storage device 1003.

The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be configured by a central processing unit (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like.

The processor 1001 reads a program (program code), a software module, or data from the auxiliary storage device 1003 and / or the communication device 1004 to the storage device 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operation described in the above embodiment is used. For example, the transmission unit 110, the reception unit 120, the setting unit 130, and the control unit 140 of the base station device 10 illustrated in FIG. 6 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001. Further, for example, the transmission unit 210, the reception unit 220, the setting unit 230, and the control unit 240 of the user device 20 illustrated in FIG. 7 are realized by a control program stored in the storage device 1002 and operated by the processor 1001. Is also good. Although it has been described that the various processes described above are executed by one processor 1001, the processes may be executed simultaneously or sequentially by two or more processors 1001. Processor 1001 may be implemented with one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

The storage device 1002 is a computer-readable recording medium, and is, for example, at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), and a RAM (Random Access Memory). It may be configured. The storage device 1002 may be called a register, a cache, a main memory (main storage device), or the like. The storage device 1002 can store a program (program code), a software module, and the like that can be executed to execute the processing according to an embodiment of the present invention.

The auxiliary storage device 1003 is a computer-readable recording medium, 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, Blu -Ray (registered trademark) disk), smart card, flash memory (eg, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, or the like. The auxiliary storage device 1003 may be called an auxiliary storage device. The storage medium described above may be, for example, a database including the storage device 1002 and / or the auxiliary storage device 1003, a server, or any other appropriate medium.

The communication device 1004 is hardware (transmitting / receiving device) for performing communication between computers via a wired and / or wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, and the like. For example, the transmitting unit 110 and the receiving unit 120 of the base station device 10 may be realized by the communication device 1004. Further, the transmission unit 210 and the reception unit 220 of the user device 20 may be realized by the communication device 1004.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an external input. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, and the like) that performs output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

The devices such as the processor 1001 and the storage device 1002 are connected by a bus 1007 for communicating information. The bus 1007 may be configured by a single bus, or may be configured by a different bus between the devices.

The base station device 10 and the user device 20 are respectively a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), and the like. And some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented by at least one of these hardware.

(Summary of Embodiment)
As described above, according to the embodiment of the present invention, a plurality of reference signals transmitted from the base station apparatus are received and measured, and the coverage state is determined based on the measurement results of the plurality of reference signals. There is provided a user apparatus, comprising: a receiving unit for determining; and a control unit for performing control of direct communication between terminals applied to a resource associated with the reference signal based on the determined coverage state.

According to the above configuration, the user apparatus 20 measures a plurality of reference signals, determines whether out of coverage or in coverage, for each cell, for each RAT, or for each resource, and controls the D2D communication in the coverage state. Can be performed according to In addition, the user device 20 can execute the control of the D2D communication according to the coverage state in each of the coverages of different RATs. In addition, the user apparatus 20 can efficiently use the NR SL resources by LTE signaling even outside the NR coverage. That is, in direct communication between terminals, control from the base station apparatus can be applied according to the communication situation.

リソース The resource associated with the reference signal may be a cell, a RAT, or a part of a radio resource. With this configuration, the user apparatus 20 measures a plurality of reference signals, determines whether the cell is out of coverage or within the coverage, for each cell, for each RAT, or for each resource, and sets the control of D2D communication to the coverage state. Can be performed accordingly.

The coverage state, whether the measurement result of the reference signal of the serving cell satisfies the determination by the predetermined threshold, or the measurement result of the reference signal of the adjacent cell satisfies the determination by the predetermined threshold, or the reference signal of the serving cell and the adjacent cell The measurement result of the reference signal may satisfy the determination based on the predetermined threshold, and may be a result of determining whether the reference signal is out of the coverage or within the coverage. With this configuration, the user apparatus 20 can determine whether the mobile station is out of coverage or in coverage based on the measurement result of the reference signal associated with the serving cell or the neighboring cell.

When the plurality of reference signals are associated with one resource, when the measurement result of a predetermined number of reference signals among the plurality of reference signals satisfies the determination based on a predetermined threshold, the coverage state is out of coverage. It may be determined that there is. With this configuration, the user device 20 can determine whether the associated resource is out of coverage or in coverage according to the number of reference signals that satisfy the condition among the plurality of reference signals.

複数 A plurality of resources may be associated with one reference signal, or a plurality of reference signals may be associated with one resource, and the coverage state may be determined for each reference signal. With this configuration, the user device 20 can set the control of the D2D communication applied to the resource in detail by determining the coverage state for each reference signal.

Further, according to the embodiment of the present invention, a transmitting unit that transmits a plurality of reference signals to the user device, and determines that the coverage state of the user device is within the coverage based on a measurement result of the plurality of reference signals. In this case, there is provided a base station apparatus having a control unit that executes control of direct communication between terminals applied to a resource associated with the reference signal.

(Supplement to the embodiment)
The embodiments of the present invention have been described above. However, the disclosed invention is not limited to such embodiments, and those skilled in the art can understand various modified examples, modified examples, alternative examples, replacement examples, and the like. There will be. Although the description has been made using specific numerical examples to facilitate understanding of the invention, unless otherwise specified, those numerical values are merely examples, and any appropriate values may be used. The division of the items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as needed, or the items described in one item may be replaced by another item. (Unless inconsistent). The boundaries between functional units or processing units in the functional block diagrams do not always correspond to the boundaries between physical components. The operation of a plurality of functional units may be physically performed by one component, or the operation of one functional unit may be physically performed by a plurality of components. In the processing procedure described in the embodiment, the order of the processing may be changed as long as there is no contradiction. Although the base station device 10 and the user device 20 have been described using a functional block diagram for convenience of processing description, such a device may be realized by hardware, software, or a combination thereof. The software operated by the processor of the base station apparatus 10 according to the embodiment of the present invention and the software operated by the processor of the user apparatus 20 according to the embodiment of the present invention are a random access memory (RAM), a flash memory, and a read memory, respectively. The data may be stored in a dedicated memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

通知 In addition, the notification of information is not limited to the aspect / embodiment described in this specification, and may be performed by another method. For example, the notification of information includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, RRC signaling may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof, and RRC signaling may be referred to as an RRC message. A connection setup (RRC （Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, or the like may be used.

Each aspect / embodiment described in this specification includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA. (Registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), The present invention may be applied to a system using Bluetooth (registered trademark), another appropriate system, and / or a next-generation system extended based on the system.

処理 The processing procedures, sequences, flowcharts, and the like of each aspect / embodiment described in this specification may be permuted as long as there is no inconsistency. For example, the methods described herein present elements of various steps in a sample order, and are not limited to the specific order presented.

The specific operation described as being performed by the base station device 10 in this specification may be performed by an upper node (upper node) in some cases. In a network including one or a plurality of network nodes (network @ nodes) including the base station device 10, various operations performed for communication with the user device 20 are different from the base station device 10 and / or the base station device 10. It is clear that this can be done by other network nodes (for example, but not limited to MME or S-GW etc.). Although the case where the number of other network nodes other than the base station device 10 is one has been described above, a combination of a plurality of other network nodes (for example, MME and S-GW) may be used.

各 Each aspect / embodiment described in this specification may be used alone, may be used in combination, or may be switched with execution.

The user equipment 20 may be provided by one of ordinary skill in the art to a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, It may also be called a wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

Base station device 10 may also be referred to by those skilled in the art as NB (NodeB), eNB (evolved NodeB), gNB (next generation NodeB), base station (Base Station), or some other suitable terminology.

用語 As used herein, the terms “determining” and “determining” may encompass a wide variety of operations. “Judgment” and “decision” are, for example, judgment (judging), calculation (computing), processing (processing), deriving (investigating), and investigating (looking up) (for example, a table). , A search in a database or another data structure), ascertaining, etc. may be considered as "determined", "determined", etc. Also, “determining” and “determining” refer to receiving (eg, receiving information), transmitting (eg, transmitting information), input (input), output (output), access (Accessing) (e.g., accessing data in the memory) may be regarded as "determined" or "determined". In addition, “judgment” and “decision” mean that resolving, selecting, choosing, choosing, establishing, comparing, etc. are regarded as “judgment” and “determined”. May be included. In other words, “judgment” and “decision” may include deeming any operation as “judgment” and “determined”.

記載 The term "based on" as used herein does not mean "based solely on" unless stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

As long as “include”, “including”, and variations thereof, are used in the present description or claims, these terms are equivalent to the term “comprising” It is intended to be comprehensive. Further, it is intended that the term "or", as used herein or in the claims, not be the exclusive OR.

Throughout this disclosure, where translations add articles, such as a, an, and the in English, these articles may be used in plurals unless the context clearly indicates otherwise. May be included.

Although the present invention has been described in detail above, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed aspects without departing from the spirit and scope of the present invention defined by the description of the claims. Therefore, the description in the present specification is for the purpose of illustrative explanation, and has no restrictive meaning to the present invention.

Reference Signs List 10 base station apparatus 110 transmitting section 120 receiving section 130 setting section 140 control section 20 user apparatus 210 transmitting section 220 receiving section 230 setting section 240 control section 1001 processor 1002 storage device 1003 auxiliary storage device 1004 communication device 1005 input device 1006 output device

Claims

A receiving unit that receives a plurality of reference signals,
A user apparatus comprising: a control unit configured to execute control of direct terminal-to-terminal communication applied to a resource associated with the reference signal based on a coverage state determined based on measurement results of the plurality of reference signals.
The user apparatus according to claim 1, wherein the resource associated with the reference signal is a cell, a radio access technology (RAT) or a part of a radio resource.
The coverage state, whether the measurement result of the reference signal of the serving cell satisfies the determination by the predetermined threshold, or the measurement result of the reference signal of the adjacent cell satisfies the determination by the predetermined threshold, or the reference signal of the serving cell and the adjacent cell The user apparatus according to claim 1, wherein the user apparatus is a result of determining whether the reference signal is out of the coverage or within the coverage depending on whether the measurement result of the reference signal satisfies the determination based on the predetermined threshold.
When the plurality of reference signals are associated with one resource, when the measurement result of a predetermined number of reference signals among the plurality of reference signals satisfies the determination based on a predetermined threshold, the coverage state is out of coverage. The user device according to claim 1, wherein the user device is determined to be present.
The user apparatus according to claim 1, wherein a plurality of resources are associated with one reference signal, or a plurality of reference signals are associated with one resource, and a coverage state is determined for each reference signal.
A transmitting unit that transmits a plurality of reference signals to the user device;
When the user device determines that the coverage state is within the coverage based on the measurement results of the plurality of reference signals, and a control unit that performs control of terminal-to-terminal direct communication applied to resources associated with the reference signal. A base station device having: