JP7685538B2 - Terminal and communication method - Google Patents

Description

The present invention relates to a terminal and a communication method in a wireless communication system.

For LTE (Long Term Evolution) and its successor systems (e.g., LTE-A (LTE Advanced) and NR (New Radio) (also called 5G)), D2D (Device to Device) technology is being considered, in which user devices communicate directly with each other without going through a wireless base station (e.g., Non-Patent Document 1).

D2D reduces traffic between user equipment and base station equipment, and enables communication between user equipment even if the base station equipment becomes unable to communicate due to a disaster or other reason. In addition, in 3GPP (registered trademark) (3rd Generation Partnership Project), D2D is called "sidelink," but in this specification, the more general term D2D is used. However, in the description of the embodiments described later, sidelink is also used as necessary.

D2D is broadly divided into D2D discovery (also called D2D discovery) for discovering other user devices with which communication is possible, and D2D communication (also called D2D direct communication, D2D communication, direct communication between terminals, etc.) for direct communication between user devices. In the following, when there is no particular distinction between D2D communication, D2D discovery, etc., they are simply referred to as D2D. Furthermore, signals transmitted and received in D2D are referred to as D2D signals. Various use cases for services related to V2X (Vehicle to Everything) in 5G are being considered (for example, Non-Patent Document 2).

3GPP TS 36.211 V15.1.0 (2018-03) 3GPP TR 22.886 V15.1.0 (2017-03)

In D2D communication, which assumes V2X, when direct communication is performed between vehicles, there are cases where an obstacle vehicle is located between the transmitting terminal and the receiving terminal, preventing direct communication.

The present invention has been made in consideration of the above points, and aims to detect a state in which communication is being hindered by an obstacle during direct communication between terminals, and to perform appropriate control.

According to the disclosed technology, a terminal is provided that has a communication unit that communicates with other terminals, a detection unit that detects that communication with the other terminal is in a jammed state or that communication with the other terminal has recovered from the jammed state, and a control unit that temporarily stops transmission to the other terminal when it is detected that communication with the other terminal is in a jammed state , wherein the detection unit detects that communication with the other terminal is in a jammed state when the receiving strength of a reflected wave of a signal transmitted by the terminal itself is above a threshold value for a certain period of time .

The disclosed technology makes it possible to detect when direct communication between terminals is being disrupted by an obstacle and to take appropriate control.

FIG. 1 is a diagram for explaining V2X. 1 is a diagram for explaining an example of an operation of a wireless communication system according to an embodiment of the present invention; 10A and 10B are diagrams for explaining an example of detecting a disturbance state in an embodiment of the present invention. 1 is a flowchart (1) for explaining an operation relating to detection of a jamming state in an embodiment of the present invention. 11 is a flowchart (2) for explaining the operation relating to detection of a jamming state in the embodiment of the present invention. 1 is a diagram for explaining an example (1) of detecting recovery from a disturbance state in an embodiment of the present invention; FIG. FIG. 13 is a diagram for explaining an example (2) of detecting recovery from a disturbance state in an embodiment of the present invention. FIG. 11 is a diagram for explaining an example (3) of detecting recovery from a disturbance state in an 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 an embodiment of the present invention. 2 is a diagram illustrating an example of a hardware configuration of a base station device 10 or a user device 20 according to an embodiment of the present invention.

Below, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example, and the embodiment to which the present invention is applicable is not limited to the following embodiment.

Existing technology is used as appropriate when operating the wireless communication system of the embodiment of the present invention. However, the existing technology is, for example, the existing LTE, but is not limited to the existing LTE. Furthermore, the term "LTE" used in this specification has a broad meaning including LTE-Advanced and systems subsequent to LTE-Advanced (e.g., NR) unless otherwise specified.

In addition, in the embodiment of the present invention, the duplex method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or other methods (for example, Flexible Duplex, etc.). In the following description, the method of transmitting a signal using a transmission beam may be digital beamforming that transmits a signal multiplied by a precoding vector (precoded with a precoding vector), or may be analog beamforming that realizes beamforming using a variable phase shifter in an RF (Radio Frequency) circuit. 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 may be analog beamforming that realizes beamforming using a variable phase shifter in an RF circuit. Hybrid beamforming that combines digital beamforming and analog beamforming may be applied. In addition, transmitting a signal using a transmission beam may be transmitting a signal at a specific antenna port. Similarly, receiving a signal using a reception beam may be receiving a signal at a specific antenna port. An antenna port refers to a logical antenna port or a physical antenna port defined in the 3GPP standard.

The method of forming the transmission beam and the reception beam is not limited to the above method. For example, in a base station device 10 or a user device 20 equipped with multiple antennas, a method of changing the angle of each antenna may be used, a method of combining a method of using a precoding vector and a method of changing the antenna angle may be used, different antenna panels may be used by switching between them, a method of combining a method of using multiple antenna panels together may be used, or other methods may be used. Also, for example, multiple different transmission beams may be used in a high frequency band. The use of multiple transmission beams is called multi-beam operation, and the use of one transmission beam is called single-beam operation.

In addition, in the embodiment of the present invention, when radio parameters, etc. are "set," it may mean that a predetermined value is set in advance (pre-configured), or that radio parameters notified from the base station device 10 or the user device 20 are set.

Figure 1 is a diagram for explaining V2X. In 3GPP, the realization of V2X (Vehicle to Everything) or eV2X (enhanced V2X) by extending the D2D function is being considered, and specifications are being developed. As shown in Figure 1, V2X is a part of ITS (Intelligent Transport Systems), and is a general term for V2V (Vehicle to Vehicle), which means a form of communication between automobiles, V2I (Vehicle to Infrastructure), which means a form of communication between an automobile and a roadside unit (RSU: Road-Side Unit) installed on the side of the road, V2N (Vehicle to Nomadic device), which means a form of communication between an automobile and a mobile terminal carried by the driver, and V2P (Vehicle to Pedestrian), which means a form of communication between an automobile and a mobile terminal carried by a pedestrian.

In the embodiment of the present invention, a communication device is mainly assumed to be mounted on a vehicle, 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, or the communication device may be a device mounted on a drone or an aircraft.

Furthermore, LTE Rel-14 specifies some V2X functions. In this specification, Mode 3 and Mode 4 are defined for resource allocation for V2X communication to the user equipment 20. In Mode 3, transmission resources are dynamically allocated by DCI (Downlink Control Information) sent from the base station device 10 to the user equipment 20. In Mode 3, SPS (Semi Persistent Scheduling) is also possible. In Mode 4, the user equipment 20 autonomously selects transmission resources from a resource pool.

3GPP is also considering V2X using LTE or NR cellular communication and terminal-to-terminal communication. It is expected that future studies of LTE or NR V2X will be conducted that are not limited to 3GPP specifications. For example, it is expected that studies will be conducted on ensuring interoperability, improving cost efficiency by implementing higher layers, using or switching between multiple RATs (Radio Access Technologies), complying with regulations in each country, and data acquisition, distribution, database management, and usage methods for the LTE or NR V2X platform.

Figure 2 is a diagram for explaining an example of the operation of a wireless communication system in an embodiment of the present invention. As shown in Figure 2, when direct communication is performed between vehicles in sidelink communication, an obstacle "Blocker" may be located between the transmitting terminal "Source" and the receiving terminal "Destination". The obstacle "Blocker" may interfere with the direct communication, temporarily degrading the quality of the direct communication. Hereinafter, the state in which direct communication is interfered with by the obstacle "Blocker" is referred to as a "blockage state", and the state in which this state is detected is referred to as a "jamming detection state".

Here, in direct communication, if the user device 20 compensates for path loss with transmission power, when transmitting during a jamming state, the power is increased and interference with surrounding user devices 20 increases. Also, if a jamming state is detected as an RLF (Radio Link Failure) and synchronization or communication is re-established, the communication interruption time becomes longer. Therefore, a "jamming detection state" different from RLF is defined.

Figure 3 is a diagram for explaining an example of detecting a jamming state in an embodiment of the present invention. A jamming detection state is when the quality of a signal such as a sidelink synchronization signal (SLSS) of a communication partner, i.e., reference signal received power (RSRP), reference signal received quality (RSRQ), received signal strength indicator (RSSI), signal-to-interference plus noise power ratio (SINR), etc., drops by a predetermined value or more within a predetermined period. A jamming state may also be detected when the block error rate (BLER) of the communication partner's signal rises by a predetermined value or more within a predetermined period.

The user device 20 can appropriately detect a state of interference caused by an obstacle by evaluating the quality of the communication partner's signal as a relative value. The user device 20 may detect the interference detection state based on the absolute value of the quality of the communication partner's signal. The user device 20 may detect the interference detection state when it detects that the reception strength of the reflected wave of the signal transmitted by the user device 20 by an obstacle (Blocker) is equal to or greater than a predetermined value within a predetermined period, instead of a decrease in the quality of the communication partner's signal. The user device 20 may detect the interference detection state when it detects an object around the vehicle (e.g., the side) by a sensor. The user device 20 may detect the interference detection state when it detects that the strength of the signal transmitted by the obstacle (Blocker) (e.g., SLSS, SLRS (Sidelink Reference Signal)) is equal to or greater than a predetermined value within a predetermined period.

The predetermined period or value used in the jamming detection state may be set by a higher layer (e.g., PBCH (Physical Broadcast Channel), PSBCH (Physical Sidelink Broadcast Channel), RRC (Radio Resource Control)) or may be specified in advance. The predetermined period or value used in the jamming detection state may be set for each reference signal of the communication partner or obstacle, or may be set for each user equipment 20. The quality may be a value measured by applying an L3 filter, or may be an L1 measurement value (e.g., L1 RSRP). The period may be in slot units, TTI (Transmission Time Interval) units, other time index, or may be indicated by the number of times the quality is measured.

FIG. 3 is a graph showing the change over time in the quality of the communication partner's signal. As shown in FIG. 3, if the quality degradation becomes larger than X one or more times in the period T ₁ , a jamming state may be detected. In the case of multiple times, the number of times may be specified. T ₁ is a predetermined time used for the jamming detection state, and X is a predetermined value used for the jamming detection state. Also, as shown in FIG. 3, if the quality is maintained in the period T ₂ by a value lowered by Y or more from the quality value at the start time of T ₁ when the jamming state was detected, it may be determined that the jamming state has been recovered from. Also, if the quality degradation is maintained in the period T ₁ by a value larger than X, the jamming state may be detected. Also, if the quality rises to larger than Y one or more times in the period T ₂ , the user device 20 may determine that the jamming state has been recovered from. In the case of multiple times, the number of times may be specified.

4 is a flowchart (1) for explaining an operation related to detection of an interference state in an embodiment of the present invention. When an interference state is detected, the user equipment 20 may perform path loss compensation in one of the following ways.
1) Use the path loss value immediately prior to the jamming detection state.
2) Use the path loss value averaged over a certain period of time immediately prior to the jamming detection state.
3) During the jamming detection state, the path loss value is a value obtained by subtracting the threshold at which the jamming state was detected. For example, if the threshold at which the jamming state was detected is X, the path loss value is set to (path loss during jamming state detection - threshold X). Note that this threshold may be different from the threshold at which the jamming state was detected, may be set in a higher layer (e.g., PBCH, PSBCH, or RRC), or may be specified in advance in the specifications.
4) Disable path loss compensation during jamming detection state.

The user device 20 may stop transmission during the jamming detection state and resume transmission after recovering from the jamming detection state.

The above-mentioned detection of the jamming state and the operation during the jamming state detection are explained with reference to the flow chart shown in FIG. 4. In step S11, the user device 20 judges whether the RSRP drop of the communication partner's signal is greater than X within T ₁ ms. If the RSRP drop is greater than X within T ₁ ms (YES in S11), the process proceeds to step S12. If the RSRP drop is not greater than X within T ₁ ms (NO in S11), the process does not transition to the jamming detection state and ends the flow. The RSRP may be replaced with another quality index. In step S11, the jamming state may be detected when the quality drop becomes greater than X one or more times during the period T ₁ , or when the quality drop is maintained greater than X. In the case of multiple times, the number of times may be specified.

In step S12, the user device 20 transitions to a jamming detection state. Alternatively, if the process proceeds from step S13 to step S12, the user device 20 maintains the jamming detection state. When the user device 20 is in the jamming detection state, it may apply transmission power control for the jamming detection state or may temporarily stop transmission.

In step S13, the user device 20 judges whether the decrease in the RSRP of the communication partner signal from the start of _T1 is less than Y during the _T2 ms period. If the decrease in the RSRP is less than Y during the _T2 ms period (YES in S13), the process proceeds to step S14. If the decrease in the RSRP is no longer less than Y within _T2 ms (NO in S13), the process proceeds to step S12. In step S13, if the quality is maintained for the period _T2 by a value equal to or greater than the value Y decreased from the quality value at the start of _T1 when the interference state was detected, the user device 20 may judge that it has recovered from the interference state. If the quality increases one or more times and becomes greater than the value Y decreased from the quality value at the start of _T1 , the user device 20 may judge that it has recovered from the interference state. In the case of multiple times, the number of times may be specified.

In step S14, the user device 20 recovers from the interference detection state and ends the flow.

Figure 5 is a flowchart (2) for explaining the operation related to detection of a jamming state in an embodiment of the present invention. When a jamming state is detected, the user equipment 20 may select and switch a combination of antenna ports or spatial domain filters (beams or precoders) so that the path loss fluctuation is Y or less than that before the jamming state is detected. The threshold value Y may be set in a higher layer (e.g., PBCH, PSBCH, or RRC), may be specified in advance in the specifications, or may be the same value as the threshold value X at which the jamming state is detected. The threshold value Y may also be specified as an absolute value.

The user equipment 20 may notify information indicating that the antenna port or spatial domain filter has been changed via any of SCI (Sidelink control information), MAC signaling, RRC signaling, or PSBCH. The user equipment 20 may also notify the changed antenna port index, precoder index, beam index, etc. in addition to or in place of the information indicating that the antenna port or spatial domain filter has been changed.

The above-mentioned detection of a jamming state and the operation during the jamming state detection are explained with reference to the flow chart shown in FIG. 5. In step S21, the user device 20 judges whether the RSRP drop of the communication partner's signal is greater than X within T ₁ ms. If the RSRP drop is greater than X within T ₁ ms (YES in S21), the process proceeds to step S22. If the RSRP drop is not greater than X within T ₁ ms (NO in S21), the process does not transition to a jamming detection state and ends the flow. It may be replaced with another quality index. In step S21, a jamming state may be detected when the quality drop becomes greater than X one or more times during the period T ₁ , or when the quality drop is maintained greater than X. In the case of multiple times, the number of times may be specified.

In step S22, the user device 20 transitions to a jamming detection state. Alternatively, if the process proceeds from step S24 to step S22, the user device 20 maintains the jamming detection state. When the user device 20 is in the jamming detection state, it may temporarily stop transmission.

In step S23, the user device 20 reselects at least one of the antenna ports and the spatial domain filter.

In step S24, the user device 20 judges whether the decrease in RSRP of the signal from the communication partner is less than Y. If the quality is equal to or greater than the value Y decreased from the quality value at the start of _T1 (YES in S24), the process proceeds to step S25, and if the decrease in RSRP is not equal to or greater than Y (NO in S24), the process proceeds to step S22. Note that in step S24, if the quality is maintained during period _T2 at a value equal to or greater than the value Y decreased from the quality value at the start of _T1 , the user device 20 may judge that it has recovered from the interference state.

In step S25, the user device 20 recovers from the interference detection state and ends the flow.

6 is a diagram for explaining an example (1) of detecting recovery from a jamming state in an embodiment of the present invention. The quality-related threshold Y and the time-related threshold _T2 for judging recovery from a jamming state may be the same as or different from the quality-related threshold X and the time-related threshold _T1 for detecting a jamming state. When the thresholds are different, the respective values may be set in a higher layer (e.g., PBCH, PSBCH, or RRC) or may be specified in advance in a specification.

An example of detecting recovery from a jamming state will be described with reference to Fig. 6. The user device 20 transitions to a jamming detection state because the quality has decreased by more than X during period _T1 . As shown in Fig. 6, when the quality is maintained during period _T2 at least a value lower than Y from the quality value at the start of _T1 when the jamming state is detected, the user device 20 may determine that the user device 20 has recovered from the jamming state.

Fig. 7 is a diagram for explaining an example (2) of detecting recovery from a jamming state in an embodiment of the present invention. In Fig. 7, an example of detecting recovery from a jamming state will be explained. The user device 20 transitions to a jamming detection state because the quality has decreased by more than X during period _T1 . As shown in Fig. 7, when the quality is maintained during period _T2 by a value equal to or greater than the quality value at the end of _T1 when the jamming state is detected, the user device 20 may determine that the user device 20 has recovered from the jamming state.

Fig. 8 is a diagram for explaining an example (3) of detecting recovery from a jamming state in an embodiment of the present invention. In Fig. 8, an example of detecting recovery from a jamming state is explained. The user device 20 transitions to a jamming detection state because the quality has decreased by more than X during a period _T1 . As shown in Fig. 7, if the quality increases by Y one or more times within a period _T2 , the user device 20 may determine that the user device 20 has recovered from the jamming state.

The operation during the jamming detection state may be performed for each reference signal that is referred to when performing the path loss calculation. The reference signal is, for example, a synchronization signal or a reference signal related to the side link, such as SLSS or SLRS (Sidelink reference signal).

If a threshold for detecting a jamming state or determining recovery from a jamming state is not set for a certain reference signal, it is not necessary to detect the jamming state. Furthermore, the jamming state detection operation may be enabled or disabled depending on the reference signal series. Furthermore, information explicitly indicating whether the jamming state detection operation is enabled or disabled may be included in SCI or DCI, MAC signaling, RRC signaling, PBCH or PSBCH. Based on the notified information explicitly indicating whether the jamming state detection operation is enabled or disabled, the user equipment 20 determines whether to perform detection of a jamming state, control in a jamming detection state, and detection of recovery from a jamming state in the embodiment of the present invention.

In addition, in the jamming detection state, the user equipment 20 may transmit a signal requesting the other user equipment 20 to operate as a relay. For example, the user equipment 20 may include a 1-bit signal requesting the other user equipment 20 to operate as a relay in the PSBCH, PSCCH, or PSSCH. The other user equipment 20 that receives the signal requesting the other user equipment 20 to operate as a relay decodes the received signal and relays it using other resources.

When a jamming state is detected, the user equipment 20 may notify the base station equipment 10 of the detection of the jamming state by UL transmission. The user equipment 20 may transmit the notification of the detection of the jamming state by any of UCI (Uplink Control Information) by PUCCH or PUSCH, MAC signaling, or RRC signaling.

When the base station device 10 is notified by the user equipment 20 via UL transmission that a jamming state has been detected, the base station device 10 may relay data to another user equipment 20 (destination terminal) that is performing sidelink communication with the user equipment 20 (source terminal). When starting the relay, the user equipment 20 (source terminal) or the base station device 10 may notify the user equipment 20 (destination terminal) of the cause of the relay (e.g., Blockage).

The operation of detecting a jamming state may be changed for unicast, multicast, or broadcast. For example, in multicast or broadcast, path loss compensation is not performed for a specific user device 20, so the operation of detecting a jamming state may be performed only in the case of unicast.

In addition, in Release 14 or Release 15 being considered by 3GPP, path loss compensation for sidelink communication is not standardized. On the other hand, in the embodiment of the present invention, it is assumed that path loss compensation is performed in sidelink communication. The detection of a jamming state, the control in a jamming detection state, and the detection of recovery from a jamming state in the embodiment of the present invention are not limited to sidelink communication, and may be applied to channels of other links such as downlink communication or uplink communication. Furthermore, the detection of a jamming state, the control in a jamming detection state, and the detection of recovery from a jamming state in the embodiment of the present invention are not limited to PSSCH, and may be applied to PSBCH, PSCCH, PRACH, SLSS, or SLRS.

The definition of detection of a jamming state in the embodiment of the present invention may be the same as detection of RLF and detection of BF (Beam Failure) in the existing technology. For example, a threshold value Q _OUT and a threshold value Q _IN may be used in the PHY layer, and when the quality is worse than Q _OUT or better than Q _IN , a report may be made to a higher layer to detect a jamming state or recover from the jamming detection state.

According to the above-described embodiment, the user device 20 can detect an interference state in sidelink communication caused by an obstacle and apply power control in the interference detection state to reduce interference with surrounding terminals. In addition, the user device 20 can detect an interference state in sidelink communication caused by an obstacle and shorten a momentary communication interruption by selecting and switching a combination of antenna ports or spatial domain filters (beams or precoders).

In other words, in direct communication between terminals, it is possible to detect when communication is being hindered by an obstacle and take appropriate control.

(Device configuration)
Next, a functional configuration example 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 functions for implementing the above-mentioned embodiments. However, the base station device 10 and the user device 20 may each include only a part of the functions in the embodiments.

<Base station device 10>
Fig. 9 is a diagram showing an example of the functional configuration of the base station device 10. As shown in Fig. 9, the base station device 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Fig. 9 is merely an example. The names of the functional divisions and functional units may be any as long as they can execute the operations related to the embodiment of the present invention.

The transmitting unit 110 has a function of generating a signal to be transmitted to the user device 20 and transmitting the signal wirelessly. The receiving unit 120 has 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. The transmitting unit 110 also has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL/UL control signals, etc. to the user device 20. Also, for example, the transmitting unit 110 transmits information indicating that another terminal is in the vicinity of the user device 20, and the receiving unit 120 receives terminal information from the user device 20.

The setting unit 130 stores in a storage device the setting information that is set in advance and various setting information to be transmitted to the user device 20, and reads it from the storage device as necessary. The content of the setting information is, for example, information related to transmission and reception parameters of D2D communication.

As described in the embodiment, the control unit 140 performs processing related to settings for the user device 20 to perform D2D communication. The control unit 140 also performs processing to notify the user device 20 of information related to wireless communication settings. A functional unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and a functional unit related to signal reception in the control unit 140 may be included in the reception unit 120.

<User device 20>
Fig. 10 is a diagram showing an example of the functional configuration of the user device 20. As shown in Fig. 10, the user device 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Fig. 10 is merely an example. As long as the operation related to the embodiment of the present invention can be executed, the names of the functional divisions and the functional units may be any names.

The transmitter 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The receiver 220 wirelessly receives various signals and acquires higher layer signals from the received physical layer signals. The receiver 220 also has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL/UL/SL control signals, etc. transmitted from the base station device 10. For example, the transmitter 210 transmits PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel), etc. to other user devices 20 as D2D communication, and the receiver 120 receives PSCCH, PSSCH, PSDCH, PSBCH, etc. from other user devices 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 it from the storage device as necessary. The setting unit 230 also stores setting information that is set in advance. The content of the setting information is, for example, information related to transmission and reception parameters of D2D communication.

The control unit 240 controls the D2D communication performed with the other user equipment 20 as described in the embodiment. The control unit 240 detects a disturbance state of the D2D communication performed with the other user equipment 20, and detects recovery from the disturbance state. The control unit 240 also receives information related to wireless communication from the base station device 10, controls the wireless communication of the user equipment 20 based on the information, and reports necessary information to the base station device 10. A functional unit related to signal transmission in the control unit 240 may be included in the transmission unit 210, and a functional unit related to signal reception in the control unit 240 may be included in the reception unit 220.

(Hardware configuration)
The functional configuration diagrams (FIGS. 9 and 10) used in the description of the above-mentioned embodiment of the present invention show functional unit blocks. These functional blocks (components) are realized by any combination of hardware and/or software. Furthermore, the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one device in which multiple elements are physically and/or logically combined, or may be realized by two or more devices that are physically and/or logically separated and directly and/or indirectly (e.g., wired and/or wirelessly) connected to each other and these multiple devices.

For example, the base station device 10 and the user device 20 in one embodiment of the present invention may both function as a computer that performs processing related to the embodiment of the present invention. FIG. 11 is a diagram showing an example of the hardware configuration of a wireless communication device that is the base station device 10 or the user device 20 in the embodiment of the present invention. The above-mentioned base station device 10 and the user device 20 may each be physically configured as a computer device including a processor 1001, a memory device 1002, an auxiliary memory device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

In the following description, the term "apparatus" may be interpreted as a circuit, device, unit, etc. The hardware configuration of the base station apparatus 10 and the user apparatus 20 may be configured to include one or more of the apparatuses 1001 to 1006 shown in the figure, or may be configured to exclude some of the apparatuses.

The functions of the base station device 10 and the user device 20 are realized by loading specific software (programs) onto hardware such as the processor 1001 and the storage device 1002, causing the processor 1001 to perform calculations and control communication by the communication device 1004 and the reading and/or writing of data in the storage device 1002 and the auxiliary storage device 1003.

The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, registers, etc.

The processor 1001 also reads out a program (program code), 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 the program. As the program, a program that causes a computer to execute at least a part of the operations described in the above-mentioned embodiment is used. For example, the transmission unit 110, the reception unit 120, the setting unit 130, and the control unit 140 of the base station device 10 shown in FIG. 9 may be stored in the storage device 1002 and realized by a control program that runs on the processor 1001. For example, the transmission unit 210, the reception unit 220, the setting unit 230, and the control unit 240 of the user device 20 shown in FIG. 10 may be stored in the storage device 1002 and realized by a control program that runs on the processor 1001. Although the above-mentioned various processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented in one or more chips. The program may also be transmitted from the network via a telecommunications line.

The storage device 1002 is a computer-readable recording medium, and may be composed of at least one of, for example, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), a RAM (Random Access Memory), etc. The storage device 1002 may also be called a register, a cache, a main memory, etc. The storage device 1002 can store executable programs (program codes), software modules, etc., for carrying out processing related to one embodiment of the present invention.

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

The communication device 1004 is hardware (transmitting/receiving device) for communicating 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, etc. 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. Also, the transmitting unit 210 and the receiving unit 220 of the user device 20 may be realized by the communication device 1004.

The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one configuration (e.g., a touch panel).

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

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

(Summary of the embodiment)
As described above, according to an embodiment of the present invention, there is provided a user equipment having a communication unit that communicates with another user equipment, a detection unit that detects that communication with the other user equipment is in a disturbed state or that communication with the other user equipment has recovered from the disturbed state by determining the quality of a signal transmitted from the other user equipment in a relative value, and a control unit that changes control related to communication with the other user equipment when it is detected that communication with the other user equipment is in a disturbed state.

With the above configuration, the user device 20 can detect interference with sidelink communication caused by an obstacle and apply power control in the interference detection state to reduce interference with surrounding terminals. In addition, the user device 20 can detect interference with sidelink communication caused by an obstacle and shorten communication interruptions by selecting and switching a combination of antenna ports or spatial domain filters (beams or precoders). In other words, in direct communication between terminals, it is possible to detect a state in which communication is being interfered with by an obstacle and perform appropriate control.

The detection unit may detect that communication with the other user device is in a state of interference when the quality of the signal falls below a first threshold within a first period. With this configuration, the user device 20 can detect a state of interference with sidelink communication caused by an obstacle by determining the interference using a relative value.

When it is detected that the communication with the other user device is in an interference state, the control unit changes the control related to the communication with the other user device to control path loss compensation based on the path loss value at the start point of the first period, or may control path loss compensation based on a value obtained by subtracting the first threshold from the measured path loss. With this configuration, the user device 20 can reduce interference with surrounding terminals by detecting an interference state in the side link communication caused by an obstacle and changing the path loss control in the interference detection state.

When it is detected that communication with the other user device is in a disrupted state, the change in control by the control unit regarding the communication with the other user device may be control to reselect an antenna port or a spatial domain filter. With this configuration, the user device 20 can detect a disrupted state of sidelink communication caused by an obstacle, and shorten a momentary interruption in communication by selecting and switching a combination of antenna ports or spatial domain filters (beams or precoders).

The detection unit may detect that the communication with the other user device has recovered from the interference state when a quality equal to or greater than a value lower than the quality at the start of the first period by a second threshold is maintained during the second period. With this configuration, the user device 20 can detect the recovery of sidelink communication from an interference state caused by an obstacle by determining the relative value.

In addition, according to an embodiment of the present invention, a base station device is provided that has a communication unit that communicates with multiple user devices, a receiving unit that receives a notification that a first user device is in a jamming state by determining the quality of a signal transmitted from a second user device as a relative value, and a control unit that relays communication between the first user device and the second user device based on the notification that the first user device is in a jamming state.

With the above configuration, when an obstacle causes interference with sidelink communication, the base station device 10 can continue communication by relaying the communication of the user device 20. In other words, in direct communication between terminals, it is possible to detect a state in which communication is being interfered with by an obstacle and perform appropriate control.

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

In addition, the notification of information is not limited to the aspects/embodiments described in this specification, and may be performed in other ways. For example, the notification of information may be performed 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 of these. In addition, RRC signaling may be called an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

Each aspect/embodiment described herein may be applied to systems utilizing LTE (Long Term Evolution), LTE-Advanced (LTE-A), 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), Bluetooth (registered trademark), or other suitable systems and/or next generation systems based on and enhanced thereon.

The steps, sequences, flow charts, etc. of each aspect/embodiment described herein may be reordered unless inconsistent. For example, the methods described herein present elements of various steps in an example order and are not limited to the particular order presented.

Specific operations described herein as being performed by the base station device 10 may in some cases be performed by its upper node. In a network consisting of one or more network nodes having a base station device 10, it is clear that various operations performed for communication with a user device 20 may be performed by the base station device 10 and/or other network nodes other than the base station device 10 (such as, but not limited to, an MME or an S-GW). Although the above example shows a case where there is one other network node other than the base station device 10, it may also be a combination of multiple other network nodes (such as an MME and an S-GW).

Each aspect/embodiment described in this specification may be used alone, in combination, or switched depending on the implementation.

User equipment 20 may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

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

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

As used herein, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

To the extent that the terms "include," "including," and variations thereof are used herein in the specification or claims, these terms are intended to be inclusive, similar to the term "comprising." Further, the term "or" as used herein is not intended to be an exclusive or.

Throughout this disclosure, where articles have been added through translation, such as a, an, and the in English, these articles may include the plural unless the context clearly indicates otherwise.

In addition, in an embodiment of the present invention, the control unit 240 is an example of a detection unit or a control unit. The transmission unit 210 or the reception unit 220 is an example of a communication unit.

Although the present invention has been described in detail above, it is clear 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 in modified and altered forms without departing from the spirit and scope of the present invention as defined by the claims. Therefore, the description in this specification is intended to be illustrative and does not have any limiting meaning on the present invention.

10 Base station device 110 Transmitter 120 Receiver 130 Setting unit 140 Control unit 20 User device 210 Transmitter 220 Receiver 230 Setting unit 240 Control unit 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device

Claims (5)

A communication unit for communicating with other terminals;
a detection unit that detects that communication with the other terminal is in a jammed state or that communication with the other terminal has recovered from the jammed state;
a control unit that temporarily stops transmission to the other terminal when it is detected that communication with the other terminal is in a disrupted state ;
The detection unit detects that communication with the other terminal is in a jammed state when a reception strength of a reflected wave of a signal transmitted by the terminal itself is equal to or greater than a threshold for a certain period of time . The terminal according to claim 1, wherein the detection unit detects that communication with the other terminal is in a disrupted state when it detects an object around the device. The terminal according to claim 1, wherein the detection unit detects that communication with the other terminal is in a disrupted state when the strength of the signal transmitted by the obstacle is equal to or greater than a threshold for a certain period of time. The terminal according to claim 1, wherein the communication unit transmits a signal to the other terminal or a base station requesting relay of the signal when it is detected that communication with the other terminal is in a disrupted state. How to communicate with other devices;
detecting that communication with the other terminal is in a disturbed state or that communication with the other terminal has recovered from a disturbed state;
when it is detected that communication with the other terminal is in a jammed state, temporarily stopping transmission to the other terminal ;
and a step of detecting that communication with the other terminal is in a jammed state when the received strength of a reflected wave of a signal transmitted by the terminal is equal to or greater than a threshold for a certain period of time .

Images